High-capacity battery assembly, repair mechanism, and repair method for high-capacity battery assembly

Abstract

The present invention relates to the field of batteries, and in particular to a high-capacity battery assembly, a repair mechanism, and a repair method for the high-capacity battery assembly, for use in prolonging the service life of high-capacity batteries while solving the problem of having a difficulty in assembling shared pipeline assemblies of existing high-capacity batteries. The high-capacity battery assembly comprises a high-capacity battery and a repair mechanism. The high-capacity battery comprises a case and battery cells arranged in the case; the case is provided with a shared electrolyte chamber; the shared electrolyte chamber is communicated with an electrolyte region of an internal cavity of each battery cell; relief holes allowing poles of the battery cells to extend out are formed in a case top plate; and the pole of each battery cell extends out of a corresponding relief hole of the case top plate, and a case region corresponding to the relief hole is fixedly sealed with a casing of the battery cell. The repair mechanism is connected to the high-capacity battery, and is used for repairing the high-capacity battery after capacity fading or suppressing the fading speed of the high-capacity battery, so as to improve the performance and cycle life of the high-capacity battery.

Description

Large-capacity battery assembly, repair mechanism, and repair method for large-capacity battery assembly Technical Field

[0001] The present invention belongs to the field of batteries, and in particular relates to a large-capacity battery assembly, a repair mechanism and a repair method for the large-capacity battery assembly. Background Art

[0002] Currently, many batteries on the market are connected in parallel or in series to form large-capacity batteries (also known as battery modules or battery packs).

[0003] Chinese patent CN219144456U discloses a large-capacity battery, the structure of which is shown in Figure 1. It includes a battery pack body formed by several parallel-connected cells and a shared piping assembly located at the bottom of the battery pack body. The shared piping assembly is used to connect the internal cavities of the several cells, so that all cells in the large-capacity battery are exposed to a single electrolyte system. The shared piping assembly can enhance the uniformity of the electrolyte in each cell within the large-capacity battery, thereby improving cycle life. The shared piping assembly can also replenish the electrolyte in the large-capacity battery, extending its service life and improving its safety.

[0004] However, this type of shared pipeline assembly is formed by directly sealing and plugging multiple sections of sub-pipes 01 and intermediate connecting pipes 02 with each other through interference fit; at this time, the multiple sections of sub-pipes 01 are arranged one by one on the lower cover plate 03 of the single cell, and the sub-pipes extend along the arrangement direction of the single cell 2, and are extruded integrally with the lower cover plate 03 of the single cell, and are connected to the opening of the lower cover plate 03 of the single cell.

[0005] During assembly, the two ends of the sub-pipeline 01 are used as the connection ends to the middle connecting pipe 02. When two single cells are connected, one end of the sub-pipeline on the two single cells is squeezed into the two ends of the middle connecting pipe 02 respectively.

[0006] During the plugging process, the shared pipeline assembly requires that each sub-pipeline 01 and the intermediate connecting pipe 02 be coaxial to achieve effective connection. However, due to the following reasons, it is difficult to ensure the coaxiality of each sub-pipeline and the intermediate connecting pipe 02:

[0007] 1) The sub-pipeline and the lower cover are an integrated part. If the position of the sub-pipeline on the lower cover is slightly deviated, or the size of each sub-pipeline is slightly deviated, the coaxiality of each sub-pipeline will deviate when plugged in.

[0008] 2) When welding the above-mentioned integrated component to the single cell barrel, due to differences in the welding process, the positions of the sub-pipes relative to the single cell barrel may be inconsistent, which in turn leads to deviations in the coaxiality of the sub-pipes during insertion;

[0009] 3) This solution requires the use of special tooling during connection. Improper use of the tooling or operator errors can lead to deviations in the coaxiality of the sub-pipelines.

[0010] In addition, during plugging, the deviation between the sub-pipelines will increase as the number of plugging increases, resulting in the coaxiality between the sub-pipelines being more difficult to ensure as the number of plugging increases; resulting in the assembly process, the yield rate decreases as the number of plugging increases.

[0011] In summary, since the sub-pipes of two adjacent single cells are difficult to be coaxial, this solution may cause the sub-pipes to be displaced relative to the lower cover plate, or the lower cover plate to be displaced relative to the single cell cylinder during insertion, thereby damaging the battery.

[0012] Summary of the Invention

[0013] The purpose of the present invention is to provide a large-capacity battery assembly, a repair mechanism and a repair method for a large-capacity battery assembly, so as to overcome the problem that the existing large-capacity battery shared pipeline assembly is difficult to assemble and at the same time extend the service life of the large-capacity battery.

[0014] A first aspect of the present invention provides a large-capacity battery assembly, comprising a large-capacity battery and a repair mechanism; the large-capacity battery comprises a housing and m single cells arranged within the housing, where m>1; the inner cavity of each single cell comprises an electrolyte region and a gas region; the housing is provided with a shared electrolyte chamber; the shared electrolyte chamber is in communication with the electrolyte regions within the inner cavities of each single cell; a top plate of the housing is provided with a relief hole through which a pole of each single cell can extend; each pole of each single cell extends through the relief hole in the top plate of the housing, and the region of the housing corresponding to the relief hole is fixedly sealed to the housing of the single cell;

[0015] The repair mechanism is connected to the large-capacity battery and is used to repair the large-capacity battery after its capacity has decayed or to suppress the decay rate of the large-capacity battery, so as to improve the performance and cycle life of the large-capacity battery.

[0016] The present invention places multiple single cells within a housing with a shared electrolyte chamber at the bottom. This shared electrolyte chamber connects to the internal cavities of each cell within the housing, allowing the cells to share electrolyte and ensure consistency. Specifically, the electrolyte chambers of each cell are connected, allowing all cells to share the same electrolyte system. This reduces variations in electrolyte content between cells, improves consistency across cells, and thus, to a certain extent, enhances the cycle life of the high-capacity battery. The shared electrolyte chamber does not require plugging, and there is no need to consider coaxial plugging in the arrangement of the cells, thus requiring lower machining and assembly precision. Furthermore, without the need for specialized tooling, the assembly process is relatively simple, significantly reducing the difficulty and cost of manufacturing these high-capacity batteries with a shared electrolyte system and enabling mass production. Furthermore, a repair mechanism can be used to repair or slow down the degradation of high-capacity batteries after capacity degradation, thereby improving their performance and cycle life.

[0017] The performance and cycle life of large-capacity batteries can be improved by using the repair mechanism in at least the following ways:

[0018] First, it can inhibit the reduction of active lithium in large-capacity batteries; second, it can replenish or replace the electrolyte in large-capacity batteries; third, it can inhibit the formation of lithium dendrites in each single cell; fourth, it can thin the thickened SEI.

[0019] Based on the above functions, the repair mechanism in the present invention may include a debris removal component, a magnetic stirring device, a fluid injection component, etc. Different repair mechanisms are described in detail below.

[0020] The present invention provides at least one repair mechanism between the bottom plate of the shell and the bottom of each single battery. The repair mechanism is a debris removal component used to remove impurities in the electrolyte. The debris removal component is a hollow structure, the inner cavity of which is filled with debris removal material, and a second through hole is provided on the debris removal component that penetrates the inner cavity and allows the electrolyte to pass through.

[0021] It is inevitable that there will be a certain amount of impurities in the electrolyte, including HF, H2O and other metal impurity ions. When the content of these impurities exceeds the standard, it will affect the battery performance and reduce the battery's charge and discharge cycle performance. Generally, electrolyte manufacturers will use impurity removal materials to preliminarily remove the above impurities during the electrolyte production process to improve the quality of the electrolyte. However, in the process of preparing the above-mentioned large-capacity batteries, it is found that in the process of injecting the above-mentioned commercially available electrolyte into such large-capacity batteries, new impurities will inevitably be introduced, or new impurities may also be generated during the charge and discharge cycle of such large-capacity batteries. Therefore, for the above-mentioned large-capacity batteries, how to effectively reduce the impurity content in the electrolyte during the charge and discharge cycle is a technical problem that urgently needs to be solved. The present invention provides an impurity removal component with an impurity removal material in the outer shell of the large-capacity battery. During the operation of the large-capacity battery, the impurity removal material is always immersed in the electrolyte to remove impurities in the electrolyte, avoid the influence of impurities on the performance of the electrolyte, and thereby improve the charge and discharge cycle performance of such large-capacity batteries.

[0022] Furthermore, there are two impurity removal components, which are located on both sides of the electrolyte shared chamber and extend along the length of the shell, thereby removing impurities and supporting the single battery.

[0023] Furthermore, the above-mentioned impurity-removing component is a hollow box with a rectangular cross-section.

[0024] Furthermore, in the y direction, the size of the impurity removal component is equal to the size of the bottom plate area of ​​the shell on both sides of the electrolyte sharing chamber.

[0025] Furthermore, the inner surface of the bottom plate of the shell is provided with a limiting guide boss extending along the x-direction; the impurity removal component is located between the limiting guide boss and the side wall of the shell.

[0026] Furthermore, the length direction of the impurity removal component is defined as the x direction, the width direction is defined as the y direction, and the height direction is defined as the z direction; the above-mentioned second through hole is provided on at least one side wall of the impurity removal component parallel to the xz plane, preferably on the side wall close to the electrolyte shared chamber, to ensure that the electrolyte can smoothly enter the inner cavity of the impurity removal component, and the impurity removal material can be fully immersed in the electrolyte, thereby improving the impurity removal effect.

[0027] Furthermore, there are a plurality of the second through holes, which are evenly distributed on the side wall of the impurity-removing component parallel to the xz plane.

[0028] Furthermore, the above-mentioned repair mechanism also includes a magnetic stirring device; the above-mentioned magnetic stirring device includes a magnet and a magnetic stirrer; the above-mentioned magnet is located in the electrolyte shared chamber, and the above-mentioned magnetic stirrer is arranged outside the shell, driving the magnet to rotate and stir the electrolyte.

[0029] During the charge and discharge cycle, a magnetic stirrer is placed below the electrolyte sharing chamber. The magnet rotates to stir the electrolyte in the electrolyte sharing chamber, allowing the electrolyte injected through the liquid replacement component to be evenly mixed with the original electrolyte. Alternatively, after subsequent electrolyte replenishment, the electrolyte can be evenly mixed with the original electrolyte in the electrolyte sharing chamber, ensuring the uniformity of lithium ion distribution and thereby improving the performance and cycle life of large-capacity batteries. When combined with the impurity removal component, impurities generated in the electrolyte can also be fully absorbed and adsorbed by the impurity removal mechanism.

[0030] Furthermore, the top plate of the housing has a protrusion in a direction away from the bottom plate of the housing, which serves as a gas chamber, and the gas chamber covers the gas port of each single battery.

[0031] Furthermore, the impurity-removing material is at least one of 4A molecular sieve, lithiated molecular sieve or α-alumina.

[0032] Furthermore, the impurity-removing material is lithiated molecular sieve and α-alumina, wherein the mass ratio of the lithiated molecular sieve to the α-alumina is 1:1, and the mass percentage of the impurity-removing material in the electrolyte is 3% to 10%.

[0033] Furthermore, the repair mechanism further includes a fluid injection component disposed on the housing. This component can be used to inject electrolyte into the large-capacity battery, expel gas from the large-capacity battery, or replace the electrolyte within the large-capacity battery. When the large-capacity battery undergoes charge-discharge cycles for a period of time, the electrolyte decomposes and consumes, resulting in reduced performance. The fluid injection component can be used to replenish electrolyte into the shared electrolyte chamber and the inner cavities of each individual cell, thereby improving the performance of the large-capacity battery. Alternatively, when the large-capacity battery undergoes charge-discharge cycles for a period of time, the electrolyte may be affected by the presence of impurities in the electrolyte, thereby improving the performance of the large-capacity battery. This replacement can be partial or complete. Furthermore, once the electrolyte areas within the inner cavities of each individual cell are connected to the shared electrolyte chamber, the fluid injection component can be used to re-inject electrolyte into the inner cavities of each individual cell and the shared electrolyte chamber to ensure electrolyte continuity. Furthermore, the fluid injection and replacement component is arranged on the outer shell, so that during the fluid replenishment and replacement process, the operation space is large, the operation is easy, and the structural stability is high.

[0034] Furthermore, in order to improve the heat dissipation performance of such large-capacity batteries, the shell is provided with avoidance holes that allow the polarity terminals of each single battery to extend out; each single battery polarity terminal extends out of the corresponding avoidance hole and the shell area around the avoidance hole is fixedly sealed with the single battery shell.

[0035] Furthermore, the housing includes a first cylindrical body with open ends and end plate assemblies fixed to the two open ends of the first cylindrical body; an avoidance hole is provided in the top plate of the first cylindrical body; a shared electrolyte chamber is located in the bottom plate of the first cylindrical body; and a fluid injection and replacement component is located on at least one of the end plate assemblies. When such large-capacity batteries are assembled into an energy storage device, multiple large-capacity batteries are arranged along the width of the large-capacity batteries, so that the end plate assemblies of each large-capacity battery are exposed. When the fluid injection and replacement component is arranged on the end plate assembly, fluid replenishment and replacement operations can be conveniently performed.

[0036] Furthermore, the end plate assembly provided with the liquid injection and replacement component includes a first sub-end plate; the first sub-end plate is provided with an electrolyte flow channel;

[0037] The fluid injection and replacement component is located on the first sub-end plate, and includes a fluid injection and replacement component body and a sealing member fixed on the fluid injection and replacement component body;

[0038] A first channel is provided on the main body of the liquid injection and replacement component for communicating with the electrolyte circulation channel; the blocking member is used to block the electrolyte circulation channel to ensure the sealing of the entire shell.

[0039] Furthermore, the first cylindrical top plate of the large-capacity battery is provided with a gas chamber, which communicates with the gas areas within each cell. This gas chamber connects the gas areas of each cell, achieving gas balance and sharing gas between cells to ensure consistency, thereby improving the cycle life of the large-capacity battery.

[0040] Furthermore, the first sub-end plate is further provided with a gas flow channel communicating with the gas chamber;

[0041] A second channel is provided on the main body of the liquid injection and replacement component for communicating with the gas circulation channel; the blocking member is also used to block the gas circulation channel;

[0042] Furthermore, the main body of the fluid injection and exchange component is a column, and the first channel and the second channel are both first through holes opened on the main body of the fluid injection and exchange component.

[0043] The present invention can also adopt a variety of different blocking methods:

[0044] The blocking piece may be a cap fastened on the main body of the fluid injection and replacement component.

[0045] The blocking member may further include an elastic blocking column sealed in the first channel and the second channel.

[0046] Using hot melt sealing, the blocking piece also includes a sealing plate and a first hot melt piece;

[0047] A step hole is provided on the fluid injection and replacement component; the step hole is connected to the first channel and the second channel;

[0048] The sealing plate is fixed on the step surface of the step hole, and the first hot melt component is fixed on the sealing plate and in the step hole where the sealing plate is located.

[0049] For another example, a part of the main body of the fluid injection component can be used as a blocking member:

[0050] The main body of the fluid injection and replacement component includes an annular fixed part and a rotating part; the rotating part is coaxially located in the annular fixed part and has a clearance fit with the annular fixed part. Under the action of external force, it can rotate in the annular fixed part;

[0051] The first channel and the second channel are both third through holes opened on the rotating member;

[0052] In the first state, by rotating the rotating member, the first channel is isolated from the electrolyte flow channel, and the second channel is isolated from the gas flow channel; in this structure, the outer peripheral surface of the rotating member can also serve as a blocking member;

[0053] In the second state, by rotating the rotating member, the first channel and the electrolyte flow channel are communicated with each other, and the second channel and the gas flow channel are communicated with each other.

[0054] The first state is: normal charge and discharge cycle state of large-capacity battery;

[0055] The second state is a state in which electrolyte is replenished into the electrolyte shared chamber and the inner cavities of each single cell by the liquid injection and replacement component, or the electrolyte in the electrolyte shared chamber and the inner cavities of each single cell is replaced.

[0056] Furthermore, in order to rotate the rotating part into position in one go, a first positioning mark and a second positioning mark are respectively provided on the annular fixing part and the rotating part. When the first positioning mark and the second positioning mark reach the set position, the first channel is connected to the electrolyte flow channel, and the second channel is connected to the gas flow channel.

[0057] Furthermore, when a part of the fluid injection and replacement component body is used as a blocking member, the fluid injection and replacement component body may also have the following structure:

[0058] The main body of the fluid injection and replacement component includes an annular fixed part and a rotating part; the rotating part is coaxially located in the annular fixed part and has a clearance fit with the annular fixed part. Under the action of external force, it can rotate in the annular fixed part;

[0059] The first channel and the second channel are the same channel, which is the same fourth through hole opened on the rotating member;

[0060] In the first state, the fourth through hole is isolated from the electrolyte flow channel and the gas flow channel by rotating the rotating member;

[0061] In the second state, the fourth through hole communicates with the electrolyte flow channel or the gas flow channel by rotating the rotating member.

[0062] Furthermore, in order to rotate the rotating part into position at one time, the annular fixing part is provided with a first identifier and a second identifier; the rotating part is provided with a third identifier, the third identifier and the first identifier reach the set position, the fourth through hole is connected to the electrolyte flow channel, the third identifier and the second identifier reach the set position, and the fourth through hole is connected to the gas flow channel.

[0063] The operating port and explosion vent of the package opening device of the present invention can be located on different end plate components. For example, the operating port of the package opening device is provided on the first sub-end plate; it is connected to one end of the electrolyte shared chamber, and in the first state, the operating port of the package opening device is sealed by a sealing member; a first explosion venting channel and an explosion venting port are provided on the other end plate component, and the two ends of the first explosion venting channel are respectively connected to the gas chamber and the explosion venting port, and an explosion venting mechanism is sealed at the explosion venting port.

[0064] The operating port and explosion vent of the package opening device of the present invention can be located on the same end plate assembly. In this case, the operating port and explosion vent of the package opening device can be the same port, which can be located on the end plate assembly provided with a fluid injection component. The corresponding end plate assembly provided with a fluid injection component also includes a second sub-end plate; the second sub-end plate is tightly attached to the outermost single battery cell in the housing and is fixedly connected to the first sub-end plate. The second sub-end plate is fixedly connected to the first sub-end plate by screws; a gasket is provided between the second sub-end plate and the first end plate, and the head of the screw passes through the second sub-end plate and the gasket in turn and is connected to the first sub-end plate. An opening is also provided on the first sub-end plate of the end plate assembly provided with a fluid injection component, serving as the operating port and explosion vent of the package opening device; the gap between the first sub-end plate and the second sub-end plate serves as a first explosion vent channel, and the two ends of the first explosion vent channel are respectively connected to the gas chamber and the explosion vent, and the explosion vent is sealed with an explosion vent mechanism. When such large-capacity batteries are assembled into energy storage equipment, multiple large-capacity batteries are arranged along the width direction of the large-capacity batteries so that the end plate assemblies of each large-capacity battery are exposed. When the liquid injection and replacement components, the package opening device operating port and the explosion vent are set on the end plate assembly, the corresponding operations can be carried out conveniently.

[0065] Furthermore, the length direction of the housing is defined as the x-direction, the width direction is defined as the y-direction, and the height direction is defined as the z-direction; the housing includes a second cylinder and a housing top plate and a housing bottom plate covering an open end of the second cylinder, the housing top plate and the housing bottom plate being parallel to the xy plane; and the electrolyte shared chamber is provided on the housing bottom plate;

[0066] The repair mechanism includes a liquid injection and replacement component, which is arranged on at least one first side wall of the second cylinder, wherein the first side wall is a side wall parallel to the yz plane; the liquid injection and replacement component is used to replenish electrolyte into the electrolyte shared chamber and the inner cavity of each single cell, or replace the electrolyte in the electrolyte shared chamber and the inner cavity of each single cell.

[0067] The present invention provides a fluid injection / exchange component on the first sidewall of the second barrel, parallel to the yz plane. This provides ample operating space during fluid replacement, facilitating ease of operation and enhancing structural stability. Furthermore, when such large-capacity batteries are assembled into an energy storage device, multiple large-capacity batteries are arranged along their width (y-direction), exposing the first sidewalls of each large-capacity battery. Positioning the fluid injection / exchange component on the first sidewall facilitates fluid replacement operations.

[0068] Furthermore, an electrolyte circulation channel is provided on the first side wall; the liquid injection and exchange component includes a liquid injection and exchange component body and a blocking member fixed to the liquid injection and exchange component body; a first channel is provided on the liquid injection and exchange component body, and both ends of the electrolyte circulation channel are respectively connected to the electrolyte shared chamber and the first channel of the liquid injection and exchange component;

[0069] The sealing member is used to block the first channel from the outside of the first sidewall. During the normal charge and discharge cycles of the large-capacity battery, the sealing member blocks the first channel, ensuring the overall sealing of the housing. After removing the sealing member, the external connecting tube is inserted into the first channel to replenish electrolyte into the shared electrolyte chamber and the inner cavities of each single cell, or to replace the electrolyte state in the shared electrolyte chamber and the inner cavities of each single cell.

[0070] Furthermore, in order to reduce the material consumption and lower the material cost of the second barrel, a cavity isolated from the electrolyte flow channel is opened on the first side wall. After the cavity is opened, the weight of the entire large-capacity battery can be reduced at the same time.

[0071] Furthermore, a first blind hole is opened on the first side wall along the x direction and passes through the first side wall, serving as a mounting hole for the main body of the liquid injection and exchange component; a second hole is opened on the first side wall along the z direction and passes through the first side wall, serving as an electrolyte circulation channel; the main body of the liquid injection and exchange component is a column, fixed in the first blind hole, and the first blind hole is sealed; the first channel is opened on the main body of the liquid injection and exchange component, and is connected to the electrolyte circulation channel.

[0072] Furthermore, the top plate of the high-capacity battery housing is equipped with a gas chamber that communicates with the internal gas areas of each cell. This gas chamber connects the gas areas of each cell, achieving gas balance and sharing gas between cells to ensure consistency across cells, thereby improving the cycle life of the high-capacity battery.

[0073] Furthermore, the first side wall is also provided with a gas circulation channel connected to the gas chamber; a second channel isolated from the first channel is provided on the main body of the liquid injection and exchange component, and the two ends of the gas circulation channel are respectively connected to the gas chamber and the second channel of the liquid injection and exchange component; the sealing member is also used to block the second channel from the outside of the first side wall.

[0074] In order to increase the flow area of ​​the second channel, the present invention can also use second channels with different cross-sections, or a porous structure, and increase the flow area of ​​the second channel through a special arrangement:

[0075] For example, an L-shaped channel can be used as the second channel. The cross-section of the horizontal channel of the L-shaped channel is a fan-shaped ring, which is concentric with the first channel and has the same flow area. Compared with the circular cross-section channel, the radial dimension requirements for the main body of the fluid injection component are smaller.

[0076] Alternatively, multiple through holes may be used as the horizontal channels of the L-shaped channel, with the multiple through holes arranged along the same circumference. Similar to the fan-shaped annular channel, under the condition of having the same flow area, the radial dimension requirement for the main body of the injection and replacement component is smaller than that for the circular cross-section channel.

[0077] Furthermore, the present invention can adopt various structural forms of blocking members to block the first channel and the second channel from the outside of the first side wall:

[0078] The blocking member may only include a nut threadedly connected to the main body of the fluid injection and replacement component. In order to improve the sealing performance, a sealing ring may be added to the threaded connection portion. The structure is relatively simple and easy to operate.

[0079] In order to further improve the sealing performance of the sealing member on the first channel and the second channel, hot melt sealing can also be used for sealing. In this case, it is necessary to improve the structure of the fluid injection and exchange component, and a hollow component extending along the x direction is coaxially arranged at the end of the main body of the fluid injection and exchange component; the hollow component is located outside the second cylinder; the sealing member also includes a first rubber ring and a second hot melt component; the first rubber ring is coaxially fixed in the hollow component, and the second hot melt component is fixed in the first rubber ring by hot melt and seals the first channel and the second channel.

[0080] Furthermore, the repair mechanism includes a fluid injection component, which includes a fluid injection component body, an electrolyte circulation pipe section and a sealing member; one end of the electrolyte circulation pipe section is fixed on the fluid injection component body and is connected to the first channel; the other end of the electrolyte circulation pipe section is connected to the electrolyte area of ​​the inner cavity of the shell; the sealing member blocks the first channel from the outside of the shell.

[0081] Furthermore, the main body of the fluid injection and replacement component is provided with a second channel that is in communication with the gas area of ​​the inner cavity of the shell; the blocking member is further configured to block the second channel from the outer side of the shell. The second channel can be used to connect the gas area of ​​the inner cavity of the shell with the external environment to facilitate fluid injection or replacement.

[0082] Furthermore, the main body of the fluid injection and exchange component is a cylinder, and the first channel and the second channel are both through holes opened on the main body of the fluid injection and exchange component.

[0083] Furthermore, an annular limiting boss is provided on the outer peripheral surface of the fluid injection and replacement component body along the circumference thereof, for cooperating with the shell to achieve fixation of the fluid injection and replacement component body.

[0084] In order to increase the flow area of ​​the second channel, the present invention can also use second channels with different cross-sections, or a porous structure, and increase the flow area of ​​the second channel through a special arrangement:

[0085] For example, a second channel with a sector ring longitudinal section can be used. The sector ring is concentric with the first channel and has the same flow area. Compared with a circular cross-section channel, the radial dimension requirement for the fluid injection component body is smaller.

[0086] Alternatively, multiple through holes may be used as the second channel, and the multiple through holes may be arranged along the same circumference. Similar to the fan-shaped annular channel, under the condition of having the same flow area, the radial dimension requirement for the fluid injection and replacement component body is smaller than that for the circular cross-section channel.

[0087] Furthermore, in order to improve the sealing performance of the first channel and / or the second channel during the charge and discharge cycle, the blocking member includes a first rubber ring and a second hot melt member;

[0088] A countersunk hole communicating with the first channel and the second channel is provided along the axial direction of the main body of the fluid injection and replacement component;

[0089] The first rubber ring is coaxially fixed in the countersunk hole, and the second hot melt component is fixed in the first rubber ring in a hot melt manner and blocks the first channel and the second channel.

[0090] Furthermore, the blocking member also includes a cap buckled on one end of the fluid injection and exchange component body, wherein the one end of the fluid injection and exchange component body is the end of the fluid injection and exchange component body located outside the shell, so as to further improve the sealing reliability of the first channel and the second channel.

[0091] Furthermore, a gas chamber is provided on the top plate of the housing; the gas chamber is communicated with the gas area in the inner cavity of each single battery; and the second channel is communicated with the gas chamber.

[0092] Furthermore, the main body of the fluid injection and replacement component is coaxially located in the mounting hole, and the annular limiting boss is seal-welded to the peripheral area of ​​the mounting hole.

[0093] Furthermore, the repair mechanism includes a fluid injection and exchange component, which includes a fluid injection and exchange component body and a sealing component; the fluid injection and exchange component body is fixed on the outer shell, and a first channel that passes through the inner cavity of the outer shell is opened on the fluid injection and exchange component body; the sealing component includes a first rubber ring and a first sealing plate; the first rubber ring is coaxially fixed in the first channel, and the first sealing plate is fixed to the first end face of the first rubber ring by hot melting and seals the first channel; wherein the first end face of the first rubber ring is the end face of the first rubber ring away from the battery outer shell.

[0094] Furthermore, the above-mentioned fluid injection and replacement component may also include an electrolyte circulation tube segment; one end of the electrolyte circulation tube segment is fixed to the fluid injection and replacement component body and is connected to the first channel; the other end of the electrolyte circulation tube segment is used to communicate with the electrolyte area of ​​the inner cavity of the shell. The end of the electrolyte circulation tube segment that communicates with the electrolyte area of ​​the inner cavity of the shell can be directly extended into the bottom of the inner cavity of the shell and is always immersed in the electrolyte. When the electrolyte needs to be replaced, as much electrolyte as possible can be withdrawn from the inner cavity of the shell, ensuring a more thorough replacement.

[0095] Furthermore, a second channel communicating with the gas area in the inner cavity of the shell is provided on the main body of the fluid injection and exchange component; the second channel can be used to connect the gas area in the inner cavity of the shell with the external environment to facilitate smooth fluid injection or fluid exchange.

[0096] In order to use the same sealing member to simultaneously block the first channel and the second channel, the first channel can be designed as a stepped through hole opened along the main body of the fluid injection and exchange component; the second channel is isolated from the small hole of the stepped through hole and is connected to the large hole of the stepped through hole; the first rubber ring is coaxially fixed in the large hole of the stepped through hole, and the first sealing plate is fixed on the first end face of the first rubber ring to simultaneously block the first channel and the second channel.

[0097] Furthermore, the axial length of the first rubber ring is greater than the axial length of the large hole of the stepped through hole; one end of the first rubber ring is in close contact with the stepped surface of the stepped through hole, and the other end extends out of the large hole of the stepped through hole; an annular folded edge is provided along the outer side of the other end of the first rubber ring along its circumference; the annular folded edge is in close contact with the end surface of the large hole of the stepped through hole. By adding the annular folded edge, the bonding strength between the first rubber ring and the main body of the fluid injection and replacement component can be improved, and the contact area between the first sealing plate and the first rubber ring can be increased, thereby further improving the bonding strength between the two and further enhancing the sealing effect.

[0098] In order to increase the flow area of ​​the second channel, the present invention can also use second channels with different cross-sections, or a porous structure, and increase the flow area of ​​the second channel through a special arrangement:

[0099] For example, a second channel with a sector ring longitudinal section can be used. The sector ring is concentric with the first channel and has the same flow area. Compared with a circular cross-section channel, the radial dimension requirement for the fluid injection component body is smaller.

[0100] Alternatively, multiple through holes may be used as the second channel, and the multiple through holes may be arranged along the same circumference. Similar to the fan-shaped annular channel, under the condition of having the same flow area, the radial dimension requirement for the fluid injection and replacement component body is smaller than that for the circular cross-section channel.

[0101] Furthermore, the blocking member further includes a cap buckled on one end of the fluid injection component body, wherein the one end of the fluid injection component body is the end of the fluid injection component body located outside the housing. A two-stage sealing method is adopted to further improve the sealing reliability of the first channel and the second channel.

[0102] Furthermore, the sealing member also includes a sealing column fixed in the first rubber ring by hot melting.

[0103] Furthermore, an annular limiting boss is provided on the outer peripheral surface of the fluid injection and replacement component body along the circumference thereof, for cooperating with the shell to achieve fixation of the fluid injection and replacement component body.

[0104] Furthermore, the shared chamber is a gas chamber, which is communicated with the gas area of ​​the inner cavity of each single battery; and the second channel is communicated with the gas chamber.

[0105] Furthermore, the housing is provided with a gas chamber, which is in communication with the gas area within each cell. The repair mechanism includes a gas injection and exhaust component and a liquid replacement component. The gas injection and exhaust component is used to replenish or exhaust the gas chamber and the interior of each cell. The liquid replacement component is used to replenish electrolyte into the shared electrolyte chamber and the interior of each cell, or to replace the electrolyte within the shared electrolyte chamber and the interior of each cell. The gas injection and exhaust component and the liquid replacement component are provided in the housing. When the large-capacity battery undergoes charge and discharge cycles for a period of time, the electrolyte decomposes and consumes, resulting in a decrease in performance. The liquid replacement component can be used to replenish electrolyte into the shared electrolyte chamber and the interior of each cell, thereby improving the performance of the large-capacity battery. Alternatively, when the large-capacity battery undergoes charge and discharge cycles for a period of time, the electrolyte may be affected by the presence of impurities in the electrolyte, thereby improving the performance of the large-capacity battery. The replacement herein can be partial or complete. In addition, after the electrolyte areas in the inner cavities of each single cell are connected to the electrolyte shared chamber, the electrolyte can be re-injected into the inner cavities of each single cell and the electrolyte shared chamber through the liquid injection component to ensure the continuity of the electrolyte. During the liquid replenishment process, the operating space is large, the operation is easy, and the structural stability is high. In addition, when the internal pressure of the battery is not conducive to the liquid replenishment operation, the gas injection and exhaust component can be used to change the internal pressure of the battery, so that the electrolyte flows smoothly during the liquid replenishment process and the electrolyte can fully penetrate the electrode of each single cell.

[0106] Furthermore, the outer shell includes a first cylinder with open ends at both ends and end plate assemblies fixed to the two open ends of the first cylinder respectively; the avoidance hole is provided on the top plate of the first cylinder; the electrolyte shared chamber is located on the bottom plate of the first cylinder; the gas chamber is located on the top plate of the first cylinder; the gas injection and exhaust components and the liquid injection and replacement components are located on the end plate assemblies. The gas injection and exhaust components and the liquid injection and replacement components can be located on the same end plate assembly or on different end plate assemblies. Based on this type of large-capacity battery assembly to form an energy storage device, a plurality of large-capacity batteries are arranged along the width direction of the large-capacity battery so that the end plate assemblies of each large-capacity battery are exposed. When the gas injection and exhaust components and the liquid injection and replacement components are arranged on the end plate assembly, the liquid replenishment and replacement operation can be conveniently performed.

[0107] Furthermore, the end plate assembly provided with the liquid injection and replacement component includes a first sub-end plate; the first sub-end plate is provided with a gas flow channel and an electrolyte flow channel; the gas injection and exhaust component and the liquid injection and replacement component are provided on the outer surface of the first sub-end plate;

[0108] The gas injection and exhaust component includes a gas injection and exhaust component body and a first sealing member fixed to the gas injection and exhaust component body; a first channel is formed on the gas injection and exhaust component body, and the first sealing member is used to seal the first channel of the component from the outer surface of the first sub-end plate; the two ends of the gas flow channel are respectively connected to the gas chamber and the first channel of the gas injection and exhaust component; the liquid injection and replacement component includes a liquid injection and replacement component body and a second sealing member fixed to the liquid injection and replacement component body; a second channel is formed on the liquid injection and replacement component body, and the second sealing member is used to seal the second channel of the component from the outer surface of the first sub-end plate; the two ends of the electrolyte flow channel are respectively connected to the electrolyte shared chamber and the second channel of the liquid injection and replacement component. When the large-capacity battery is in a normal charge and discharge cycle state, the first sealing member is used to seal the first channel, and the second sealing member is used to seal the second channel, thereby ensuring the overall sealing of the shell.

[0109] Furthermore, the main body of the gas injection and exhaust component is a cylinder, the first channel is a through hole axially opened on the main body of the gas injection and exhaust component; the first blocking piece is a first cap buckled on the main body of the gas injection and exhaust component; the main body of the liquid injection and exchange component is a cylinder, the second channel is a through hole axially opened on the main body of the liquid injection and exchange component; the second blocking piece is a second cap buckled on the main body of the liquid injection and exchange component.

[0110] To further enhance the sealing performance of the gas injection and exhaust components, as well as the fluid injection and exchange components, during the normal charge and discharge cycles of large-capacity batteries, the first sealing member includes a first hydraulic quick-connector matrix that seals within the first channel; the second sealing member also includes a second hydraulic quick-connector matrix that seals within the second channel. The hydraulic quick-connector matrix improves the sealing performance of the gas injection and exhaust components, as well as the fluid injection and exchange components, while also reducing the environmental requirements of the fluid injection and exchange process.

[0111] Furthermore, the first sub-end plate is provided with an operating port for the package opening device; a first explosion relief channel and an explosion relief port are provided on the other end plate assembly, and both ends of the first explosion relief channel are respectively connected to the gas chamber and the explosion relief port, and an explosion relief mechanism is sealed at the explosion relief port.

[0112] Furthermore, the end plate assembly provided with the gas injection and exhaust components and the liquid injection and replacement components further includes a second sub-end plate; the second sub-end plate is in close contact with the outermost single battery cell in the housing and is fixedly connected to the first sub-end plate.

[0113] Furthermore, the second sub-end plate is fixedly connected to the first sub-end plate by screws; a gasket is provided between the second sub-end plate and the first end plate, and the screw head passes through the second sub-end plate and the gasket in sequence to connect with the first sub-end plate.

[0114] Furthermore, an opening is provided on the first sub-end plate of the end plate assembly, which is provided with the gas injection and exhaust components and the liquid injection and replacement components, serving as an operating port for the package opening device and an explosion vent. The gap between the first sub-end plate and the second sub-end plate serves as a first explosion vent channel, the two ends of which are connected to the gas chamber and the explosion vent, respectively. The explosion vent is sealed with an explosion vent mechanism. When such large-capacity batteries are assembled into energy storage devices, multiple large-capacity batteries are arranged along the width of the large-capacity batteries, so that the end plate assemblies of each large-capacity battery are exposed. When the liquid injection and replacement components, the operating port for the package opening device, and the explosion vent are arranged on the end plate assembly, the corresponding operations can be conveniently performed.

[0115] Furthermore, the repair mechanism includes a fluid injection component; the fluid injection component includes a columnar fluid injection component body; the fluid injection component body is fixed to the housing, and the fluid injection component body is provided with a fifth channel that is connected to the electrolyte area of ​​the housing cavity, and the first tube is installed in the fifth channel; the end of the first tube located outside the housing is sealed. When the large-capacity battery is charged and discharged for a period of time, the electrolyte decomposes and consumes, resulting in a decrease in performance. The end of the first tube located outside the housing can be opened, and electrolyte can be injected into the housing cavity through the first tube, the first channel, and the fifth channel to improve battery performance. Alternatively, when the battery is charged and discharged for a period of time, the electrolyte is affected by impurities in the electrolyte, and the electrolyte in the housing cavity can be replaced by the fluid replacement component to improve battery performance. The replacement here can be partial or complete. After the injection or replacement operation is completed, the end of the first tube located outside the housing can be sealed. The operation is simple and convenient, and the fluid injection and replacement operation can be performed multiple times.

[0116] Furthermore, the main body of the fluid injection / exchange component defines a sixth channel that connects to the gas area within the housing. A second tube is positioned within the sixth channel; the second tube's end, located outside the housing, is sealed. The second tube and the sixth channel connect the gas area within the housing to the external environment, facilitating smooth fluid injection or exchange.

[0117] Furthermore, the first and second tubes are made of plastic tubes that do not react with the electrolyte, and the ends outside the shell are sealed by heat shrink extrusion sealing, which has high sealing reliability and a relatively simple sealing method and structure.

[0118] In order to further improve the sealing reliability of the fluid injection and exchange component body during the battery charge and discharge cycle, the above-mentioned fluid injection and exchange component also includes a sealing plug; the fifth channel is a stepped through hole opened along the fluid injection and exchange component body; the sixth channel is isolated from the small hole of the stepped through hole and is connected to the large hole of the stepped through hole; the ends of the first tube and the second tube located outside the shell are located in the large hole of the stepped through hole; the sealing plug is inserted into the large hole of the stepped through hole to seal the fifth channel and the sixth channel.

[0119] Furthermore, a sealant layer is provided on the stepped surface of the fifth channel, and the ends of the first and second tubes located outside the housing extend out of the sealant layer. The sealant layer improves the stability of the first and second tubes within the fifth and sixth channels, respectively, while also providing a seal between the tubes and the corresponding channels.

[0120] Furthermore, the above-mentioned fluid injection and replacement component also includes a sealing end cover; the sealing end cover is fixed to the fluid injection and replacement component body in a detachable manner to reseal the fifth channel and the sixth channel, which can further improve the sealing reliability of the fluid injection and replacement component body during the battery charge and discharge cycle.

[0121] Furthermore, the repair mechanism includes a fluid injection component; the fluid injection component includes a fluid injection component body and a blocking member;

[0122] The main body of the fluid injection and exchange member is cylindrical and is used to be fixed to the housing. The main body of the fluid injection and exchange member is provided with a seventh channel that is in communication with the electrolyte area of ​​the inner cavity of the housing. The blocking member includes n groups of sealing units, where n is an integer greater than or equal to 1. When n is equal to 1, the sealing unit is disposed in the seventh channel to seal the seventh channel. When n is greater than 1, n groups of sealing units are stacked sequentially along the axial direction of the seventh channel in the seventh channel to seal the seventh channel.

[0123] Each set of sealing units includes a first sealing plug and a sealing coating layer stacked in sequence along the axial direction of the seventh channel. The first sealing plug is located on the side closest to the inner cavity of the shell, and the sealing coating is located on the side away from the inner cavity of the shell. After the battery is charged and discharged for a period of time, the electrolyte decomposes and consumes, resulting in reduced performance. The sealing units can be removed one by one. The sealing coating in each sealing unit can be removed by dissolving, tearing, or other methods. The sealing plug can then be pulled out using a tool, and electrolyte can then be injected into the inner cavity of the shell through the seventh channel to improve battery performance. Alternatively, after the battery is charged and discharged for a period of time, if impurities in the electrolyte affect battery performance, the sealing unit can be removed using the above process and the electrolyte in the inner cavity of the shell can be replaced based on the seventh channel to improve battery performance. After the injection or replacement operation is completed, the seventh channel can be sealed from the outside of the shell using at least one set of sealing units, which is simple and convenient to operate. The present invention is based on the fact that each set of sealing units can achieve two seals on the seventh channel, ensuring high sealing reliability in the seventh channel area during the battery charge and discharge cycle. In addition, the sealing unit of the present invention has a simple structure, is easy to manufacture and seal, and has a low cost.

[0124] Furthermore, in order to prevent the sealing member from falling out of the seventh channel due to the pressure in the inner cavity of the shell, the present invention provides an annular groove along the circumference of the inner wall of the seventh channel; a limit ring is installed in the annular groove; the end face of the outermost sealing unit in the seventh channel abuts against the limit ring, and the limit ring limits the axial movement of n groups of sealing units in the seventh channel; wherein the outermost sealing unit in the seventh channel is the sealing unit that is farthest from the inner cavity of the shell in the axial direction of the seventh channel.

[0125] Furthermore, the blocking member includes a second sealing plug; the second sealing plug is stacked axially along the seventh channel and outside the outermost sealing unit, with the end face of the second sealing plug abutting the retaining ring. With the addition of the second sealing plug, the retaining ring abuts the second sealing plug, thereby preventing the retaining ring from abutting the sealing coating and damaging the sealing performance of the sealing coating.

[0126] Furthermore, the main body of the fluid injection / exchange component is provided with an eighth channel that connects to the gas zone within the housing; the seventh channel is a stepped through-hole formed along the main body of the fluid injection / exchange component; the eighth channel is isolated from the small hole of the stepped through-hole and connects to the larger hole of the stepped through-hole; and a sealing member is disposed within the larger hole of the stepped through-hole. The eighth channel connects the gas zone within the housing with the external environment, facilitating smooth fluid injection or exchange. Simultaneously, by designing the seventh channel as a stepped through-hole, the sealing member can simultaneously block both the seventh and eighth channels, resulting in a simple structure and convenient operation.

[0127] Furthermore, the large hole of the stepped through hole is a tapered hole, and the small end of the tapered hole is close to the small hole of the stepped through hole. It can be understood that the blocking piece adopts a tapered column structure adapted to the tapered hole, and such a design facilitates the disassembly of the blocking piece.

[0128] Furthermore, the above-mentioned liquid injection and replacement component also includes an electrolyte connecting pipe section; one end of the electrolyte connecting pipe section is fixed on the liquid injection and replacement component body and is connected to the seventh channel; the other end of the electrolyte connecting pipe section is used to communicate with the electrolyte area in the inner cavity of the shell.

[0129] Furthermore, the sealing coating layer adopts a sealing paint that does not react with the electrolyte.

[0130] Furthermore, a gas chamber is provided on the top of the housing, and the gas areas of the individual cells are communicated with each other through the gas chamber; a first opening is provided on the gas chamber, which is in communication with the inner cavity of the gas chamber; and a second opening is provided on the electrolyte shared chamber, which is in communication with the inner cavity of the electrolyte shared chamber.

[0131] The repair mechanism includes a fluid injection and replacement mechanism, and the fluid injection and replacement mechanism includes a first one-way valve and a second one-way valve; a first one-way valve is provided on the first opening, and a second one-way valve is provided on the second opening, and the first one-way valve and the second one-way valve have the same structure. A first one-way valve and a second one-way valve are provided on the gas chamber and the electrolyte shared chamber of the large-capacity battery, and the first one-way valve and the second one-way valve can only be opened from the outside to the inside, so that the first one-way valve and the second one-way valve can reliably seal the first opening and the second opening of the large-capacity battery when the large-capacity battery is working normally. In addition, the first one-way valve and the second one-way valve can also be directly connected to the fluid replenishment and replacement device after the large-capacity battery has been used for a period of time, without the need for corresponding disassembly or replacement, which is very convenient for performing fluid replenishment and fluid replacement operations on the large-capacity battery, and the fluid replenishment and fluid replacement operations can be performed multiple times.

[0132] Furthermore, the first one-way valve includes a fixed sleeve, a sealing sleeve and a sealing assembly; the fixed sleeve is installed on the first opening and is sealed with the first opening; the sealing sleeve is installed in the fixed sleeve, and a spring limit plate is provided at one end of the inner cavity of the sealing sleeve, and a positioning plate is provided at the other end, and the spring limit plate and the positioning plate are both hollow plates; the sealing assembly includes a third sealing plate, a sealing column and a compression spring, the sealing column is arranged in the sealing sleeve, and its two ends pass through the spring limit plate and the positioning plate respectively, a spring baffle is provided on the sealing column, and the compression spring is sleeved on the sealing column and is located between the spring limit plate and the spring baffle, the third sealing plate is arranged at one end of the sealing column passing through the spring limit plate, and the third sealing plate can seal the port of the sealing sleeve under the action of the compression spring; the sealing column passes through one end of the positioning plate and extends to the outside of the sealing sleeve. When the one-way valve of this structure is opened, it can only be opened by external gas, liquid or external force with a certain pressure, which can achieve reliable sealing of the first opening and the second opening when the large-capacity battery is working normally. At the same time, when performing fluid replenishment and replacement operations, it is directly connected to an external fluid replenishment and replacement device. The one-way valve of this structure makes it easy to open when replenishing and replacing the fluid, and it is also easy to automatically seal the first opening and the second opening in time after the fluid replenishment is completed, ensuring that the electrolyte in the large-capacity battery is not affected by external air.

[0133] Furthermore, a first stepped hole is provided on the inner wall of the fixing sleeve, and an annular boss is provided on the outer wall of the sealing sleeve. The annular boss of the sealing sleeve is positioned in engagement with the stepped surface of the first stepped hole. This ensures a reliable connection between the sealing sleeve and the fixing sleeve and prevents the sealing sleeve from being pushed away from the fixing sleeve due to excessive external gas or liquid pressure.

[0134] Furthermore, it also includes a pressure relief valve, which is connected to the second one-way valve, and the pressure relief valve includes an opening component and a pressure relief component; the pressure relief component includes an outer pipe section and a pressure relief membrane arranged in the outer pipe section; the outer pipe section is used to be connected to the fixed sleeve; the opening component includes an inner pipe section and a top pressure plate, the inner pipe section is nested in the outer pipe section, and is located at the end of the outer pipe section away from the pressure relief membrane, the top pressure plate is a hollow plate, which is fixed in the inner pipe section, and is used to press the sealing column when the pressure relief valve is connected to the second one-way valve, so as to open the second one-way valve, so that the inner cavity of the pressure relief valve is connected to the inner cavity of the electrolyte shared chamber.

[0135] Furthermore, the outer pipe section and the fixing sleeve are connected by a tapered pipe thread, and thread sealant is coated between the connecting threads to improve the sealing reliability of the connection between the second one-way valve and the pressure relief valve.

[0136] Furthermore, a first sealing ring is provided between the outer wall of the inner pipe section and the inner wall of the fixed sleeve. The first sealing ring provides a primary seal between the pressure relief valve and the second one-way valve. Simultaneously, a threaded seal between the outer pipe section of the pressure relief valve and the second one-way valve provides a secondary seal. These two seals further ensure the tightness of the connection between the pressure relief valve and the second one-way valve.

[0137] Furthermore, an annular clamping platform is provided on the inner wall of the outer tube section, and an annular step is provided on the outer wall of the inner tube section. The annular clamping platform of the outer tube section axially positions the annular step of the inner tube section so that the outer tube section drives the inner tube section to move axially.

[0138] Furthermore, it also includes a plugging cap, which is connected to the first one-way valve. The plugging cap is a circular sealing cover with one end open, and is used to achieve sealing of the first opening.

[0139] Furthermore, the plugging cap is connected to the first one-way valve via a tapered pipe thread, and thread sealant is coated between the connecting threads.

[0140] Furthermore, two plugging caps are included, which are respectively connected to the first one-way valve and the second one-way valve. The plugging cap is a circular sealing cover with one end open, which is used to seal the first opening and the second opening.

[0141] Furthermore, the gas chamber and the electrolyte shared chamber are formed by the shell, and multiple single cells are placed side by side in the shell. Avoidance holes are opened at the top of the shell corresponding to the positions of the polarity terminals of each single cell. After the polarity terminals of each single cell pass through the avoidance holes, the single cells are connected in parallel. The top and bottom of the shell are respectively provided with shared chambers, the shared chamber at the top is a gas chamber, and the shared chamber at the bottom is an electrolyte shared chamber. The first opening is provided on the gas chamber, and the second opening is provided on the electrolyte shared chamber.

[0142] Furthermore, the repair mechanism includes a fluid replenishment and replacement device, which includes an outer box body and a rotating component, a pushing component, a hole opening component, a fluid replenishment and replacement component, and a hole sealing component arranged in the outer box body;

[0143] The outer box body is provided with a fluid replenishment interface;

[0144] The hole opening component, the liquid replacement component and the hole sealing component are all connected to the rotating component, and the rotating component can rotate the hole opening component, the liquid replacement component and the hole sealing component to the liquid replacement interface respectively;

[0145] The pushing assembly provides a linear thrust to move the hole opening assembly, the fluid replacement assembly and the hole sealing assembly toward the fluid replacement interface; under the action of the pushing assembly, the hole opening assembly, the fluid replacement assembly and the hole sealing assembly can realize the hole opening, fluid replacement and hole sealing operations.

[0146] The hole opening component, fluid replenishment component and hole sealing component are integrated in the outer box. The device has a good degree of integration and a low cost for fluid replenishment. When the battery is replenished with fluid, only one connection to the battery is required to complete the hole opening, fluid replenishment, hole sealing and other operations, which is simple to operate.

[0147] Furthermore, in the fluid replacement device, the rotating assembly includes at least one turntable and a rotating drive unit, which includes a rotating shaft and a rotating motor. The hole opening assembly, the fluid replacement assembly, and the hole sealing assembly are all mounted on the turntable, which is fixed to the rotating shaft. The rotating motor is connected to the rotating shaft, and both ends of the rotating shaft are connected to the outer housing via bearings. This rotating assembly structure allows for reliable installation of the hole opening assembly, the fluid replacement assembly, and the hole sealing assembly, while also enabling accurate rotation of the hole opening assembly, the fluid replacement assembly, and the hole sealing assembly to the fluid replacement interface.

[0148] Furthermore, in the fluid replenishment and exchange device, the number of turntables is preferably two. These two turntables can stably support the hole opening assembly, the fluid replenishment and exchange assembly, and the hole sealing assembly, while also minimizing the number of parts in the entire device. The front turntable and the rear turntable are fixed by multiple screws to make the structure of the entire rotating assembly more stable.

[0149] Furthermore, in the fluid replenishment device, the pushing assembly includes a pushing motor, a pushing rod and a gear rack assembly. The output shaft of the pushing motor is connected to the gear, driving the gear to rotate, and the rotation of the gear drives the rack to move linearly. The pushing rod is connected to the rack, and the pushing rod applies linear thrust under the drive of the rack. The pushing assembly can not only accurately apply forward linear thrust, but also can promptly withdraw the linear thrust in the opposite direction after completing the corresponding operation.

[0150] Furthermore, in the fluid replenishing and exchanging device, the end of the push rod that applies the linear thrust has a curved surface, and the curved surface is in point contact when applying the thrust, which enables the push rod to apply the thrust more evenly and accurately.

[0151] Furthermore, in the fluid replenishing and exchanging device, the hole-opening assembly includes a mounting sleeve, a mounting rod and a hole-opening unit. The mounting rod cooperates with the mounting sleeve to reliably install the hole-opening unit on the rotating assembly. The hole-opening unit can reliably form a channel on the battery that is connected to the battery cavity, and the hole-opening operation is simple and reliable.

[0152] Furthermore, the drilling assembly in the fluid replenishment and replacement device also includes a drilling positioning spring. This spring is mounted on the auger and controls the feed rate of the drilling unit. This spring pushes the auger forward relatively slowly and steadily, preventing damage to the auger due to sudden feed. Furthermore, the spring provides a force to return the drilling unit to its initial position after the drilling operation is complete, facilitating fluid replenishment and replacement.

[0153] Furthermore, in the fluid replenishing and exchanging device, the fluid replenishing and exchanging component mainly includes an inner fluid injection cylinder, an outer fluid injection cylinder and a fluid injection spring. The fluid replenishing and exchanging component has a simple structure and can perform fluid replenishing operations on the battery to improve its performance.

[0154] Furthermore, in the fluid replenishing and exchanging device, in order to ensure the sealing of the connection between the liquid injection inner cylinder and the battery's fluid replenishing and exchanging joint, a conical nozzle is provided at the end of the liquid injection inner cylinder, and the liquid injection inner cylinder is sealedly connected to the battery's fluid replenishing and exchanging joint channel through the conical nozzle.

[0155] Furthermore, in the fluid replenishing and exchanging device, the sealing assembly includes a sealing spring, a sealing cylinder and a sealing push rod. The sealing push rod is arranged in the sealing cylinder and can push the sealing plug to seal the battery fluid replenishing and exchanging joint under the action of the pushing assembly. The sealing assembly has a simple structure and reliable sealing.

[0156] Furthermore, the repair mechanism also includes a fluid replenishment connection component; the fluid replenishment connection component includes a first fluid replenishment connector and a second fluid replenishment connector; the insertion section of the first fluid replenishment connector is inserted into the connecting sleeve of the second fluid replenishment connector to achieve a plug-in connection between the first fluid replenishment connector and the second fluid replenishment connector. After the connection, part of the pipeline of the first fluid replenishment connector and the second fluid replenishment connector overlaps, which can effectively reduce the pipeline length between the large-capacity battery and the fluid replenishment device, so as to facilitate the fluid replenishment device to perform related operations on the large-capacity battery. At the same time, the insertion section of the first fluid replenishment connector is inserted into the connecting sleeve of the second fluid replenishment connector to achieve a plug-in positioning installation of the first fluid replenishment connector and the second fluid replenishment connector. The positioning of the first fluid replenishment connector and the second fluid replenishment connector is more reliable, and the sealing between the first fluid replenishment connector and the second fluid replenishment connector can also be improved. The first fluid replenishment connector and the second fluid replenishment connector are connected by a flange that is very convenient to connect and disassemble. This fixing method is very convenient for connecting and disassembling the fluid replenishment device and the large-capacity battery.

[0157] In the replacement fluid connection assembly, a first sealing ring is provided at the connection between the first connecting flange and the second connecting flange. The first sealing ring can ensure the sealing of the connection between the first replacement fluid joint and the second replacement fluid joint. At the same time, a second sealing ring is also provided between the annular boss of the first replacement fluid joint and the annular notch of the second replacement fluid joint. The second sealing ring further improves the sealing of the connection between the first replacement fluid joint and the second replacement fluid joint.

[0158] In the replacement fluid connection assembly, the first replacement fluid connector is fixedly connected to the large-capacity battery through the annular limiting boss on the connector body. This connection method can achieve accurate installation of the first replacement fluid connector and also facilitates the sealing of the connection between the first replacement fluid connector and the large-capacity battery.

[0159] In the replacement fluid connection assembly, an annular chamfer is provided on the end of the connector body of the first replacement fluid connector that is inserted into the second replacement fluid connector. The annular chamfer has a guiding and positioning function, which facilitates the insertion of the first replacement fluid connector and the second replacement fluid connector.

[0160] In the fluid replacement connection assembly, the channels within the first fluid replacement connector include a ninth channel and a tenth channel, which are isolated from each other. The ninth channel is used to connect to the electrolyte area of ​​the large-capacity battery, and the tenth channel is used to connect to the gas area of ​​the large-capacity battery. During the fluid replacement process, the tenth channel connects the gas area of ​​the large-capacity battery cavity with the cavity of the fluid replacement device. This channel changes the internal pressure of the large-capacity battery, ensuring smooth electrolyte flow during the replacement process and allowing the electrolyte to fully penetrate the electrode plates of each single cell in the large-capacity battery.

[0161] In the fluid replacement connection assembly, the ninth channel is connected to an electrolyte pipe section, which is always immersed in the electrolyte area of ​​the large-capacity battery. When fluid replacement is required, as much electrolyte as possible from the inner cavity of the large-capacity battery can be extracted, making the fluid replacement more thorough.

[0162] In the replacement fluid connection assembly, a sealing channel communicating with the channel is further provided on the joint body. A rubber ring is provided in the sealing channel. When the sealing channel is blocked, the rubber ring cooperates with the sealing plug to achieve reliable sealing of the sealing channel.

[0163] In the replacement fluid connection assembly, the ninth channel and the tenth channel are L-shaped channels, which facilitate the ninth channel and the tenth channel to be connected to the electrolyte area and the gas area of ​​the large-capacity battery respectively.

[0164] Furthermore, the repair mechanism includes a fluid injection and explosion relief component; the fluid injection and explosion relief component includes a fluid injection component and an explosion relief pipe component;

[0165] The fluid injection and replacement component includes a columnar fluid injection and replacement component body and a third sealing member; the fluid injection and replacement component body is fixed to the housing, and a third channel is formed in the fluid injection and replacement component body and is connected to the electrolyte area of ​​the inner cavity of the housing; the third sealing member is used to block the third channel; and the third sealing member can be separated from the third channel under the action of thermal runaway pressure or temperature of the lithium-ion battery;

[0166] The explosion relief pipe component comprises an explosion relief pipe and an explosion relief membrane fixed in the explosion relief pipe; the explosion relief pipe is coaxially sealed and sleeved with the main body of the liquid injection and replacement component in a detachable manner.

[0167] After the battery has been charged and discharged for a period of time, the electrolyte is decomposed and consumed, resulting in reduced performance. The explosion relief tube component can be disassembled, the third sealing component can be opened, and the electrolyte can be added to the inner cavity of the shell through the third channel on the main body of the liquid injection component to improve the battery performance; or, after the battery has been charged and discharged for a period of time, the battery performance is affected by the appearance of impurities in the electrolyte, and the electrolyte in the inner cavity of the shell can be replaced by the liquid injection component to improve the battery performance. The replacement here can be a partial replacement or a complete replacement. After completing the liquid replenishment or liquid replacement operation, the third channel is blocked from the outside of the shell using the third sealing component, and the explosion relief tube component is installed. The operation is simple and convenient, and the liquid injection and replacement operation can be performed multiple times. When the battery has thermal runaway, under the action of internal pressure or temperature, the third sealing component detaches from the third channel, and enters the explosion relief tube through the third channel along with the thermal runaway smoke and part of the electrolyte, breaking through the explosion relief membrane and being discharged. The liquid injection and replacement and explosion relief components can complete the three functions of liquid injection, liquid replacement and explosion relief of lithium-ion batteries, so that the lithium-ion battery with this functional component does not need to set up three corresponding components for the three functions, has a simple structure and low cost.

[0168] Furthermore, the main body of the fluid injection and replacement component is provided with a fourth channel that is in communication with the gas area of ​​the inner cavity of the housing; the fourth channel is isolated from the third channel; and the third blocking member is further configured to block the fourth channel. The fourth channel can be used to connect the gas area of ​​the inner cavity of the housing with the external environment, thereby facilitating fluid injection or replacement.

[0169] Furthermore, the third blocking member is solid paraffin filled in the third channel and the fourth channel.

[0170] Furthermore, the fluid injection and explosion relief component also includes an electrolyte connecting pipe and a gas connecting pipe; the third channel is connected through the electrolyte connecting pipe and the electrolyte area of ​​the inner cavity of the shell; the fourth channel is connected through the gas connecting pipe and the gas area of ​​the inner cavity of the shell.

[0171] Furthermore, the main body of the fluid injection and exchange component is a cylinder; a first blind hole is opened along the axial direction of the cylinder; a second blind hole and a third blind hole isolated from each other are opened at the bottom of the blind hole along the axial direction of the cylinder; a fifth through hole and a sixth through hole are opened along the radial direction of the cylinder respectively, which are connected with the second blind hole and the third blind hole; the second blind hole and the fifth through hole constitute a fourth channel; the third blind hole and the sixth through hole constitute a third channel; and the explosion relief pipe is sealed and sleeved in the first blind hole.

[0172] Furthermore, the outer wall of the explosion relief pipe is threadedly connected to the inner wall of the first blind hole.

[0173] Furthermore, one end of the fourth channel is located in the inner cavity of the shell and is communicated with the gas area in the inner cavity of the shell.

[0174] Furthermore, one end of the electrolyte connecting tube is fixed to one end of the third channel, and the other end is close to the bottom plate of the shell; and in the height direction of the shell, the highest position of the electrolyte connecting tube is higher than the electrolyte liquid level in the inner cavity of the shell.

[0175] Furthermore, the shell is also provided with a gas chamber; the gas chamber is connected to the gas area of ​​the inner cavity of each single cell; the repair mechanism includes a functional interface; the functional interface includes a columnar body, a second explosion relief mechanism, a fourth blocking member and a fifth blocking member; a liquid channel, a gas channel and a second explosion relief channel are provided on the columnar body; one end port of the liquid channel is connected to the electrolyte shared chamber, and the other end is provided with a fourth blocking member; one end port of the gas channel is connected to the gas chamber, and the other end is provided with a fifth blocking member; one end port of the second explosion relief channel is connected to the gas chamber, and the other end is provided with a second explosion relief mechanism. When the large-capacity battery is charged and discharged for a period of time, the electrolyte is reduced due to decomposition and consumption, resulting in a decrease in the performance of the large-capacity battery. The electrolyte can be replenished into the shell of the large-capacity battery through the liquid channel on the functional interface to improve the performance of the large-capacity battery. Or, when the large-capacity battery is charged and discharged for a period of time, the electrolyte appears in the electrolyte, affecting the performance of the large-capacity battery. The electrolyte in the shell of the large-capacity battery can also be replaced through the liquid channel to improve the performance of the large-capacity battery. The replacement here can be a partial replacement or a complete replacement. When the air pressure inside the large-capacity battery is not conducive to the fluid injection and replacement operation, the air can be exhausted outward through the gas channel to reduce the air pressure inside the large-capacity battery, so that the electrolyte flows smoothly during the fluid injection and replacement process, and the electrolyte can also fully infiltrate the pole pieces of each single cell. When a large-capacity battery has a thermal runaway, the thermal runaway smoke generated in the large-capacity battery can also be released through the second explosion relief channel to avoid more serious accidents, thereby improving the safety of the large-capacity battery. The functional interface integrates the liquid channel, gas channel, and second explosion relief channel into a cylindrical body, which facilitates the processing of parts and the assembly of large-capacity batteries.

[0176] Furthermore, the housing includes a first barrel with open ends and end plate assemblies fixed to the two open ends of the first barrel; an avoidance hole is provided in the top plate of the first barrel; the electrolyte sharing chamber is located in the bottom plate of the first barrel; the gas chamber is located in the top plate of the first barrel; and the functional interface is located on one of the end plate assemblies. When such large-capacity batteries are assembled into an energy storage device, multiple large-capacity batteries are arranged along the width of the large-capacity batteries, so that the end plate assemblies of each large-capacity battery are exposed. When the functional interface is provided on the end plate assembly, fluid injection and replacement operations can be facilitated, and the explosion relief piping in the energy storage device can be rationally arranged.

[0177] Furthermore, the end plate assembly provided with the functional interface includes a first sub-end plate; the first sub-end plate is provided with a communication channel connected to the gas channel or the electrolyte channel.

[0178] Furthermore, the communication channel is a groove provided on the first sub-end plate along the height direction and a blocking plate fixedly covering the groove.

[0179] Furthermore, the end plate assembly provided with the gas injection and exhaust components and the fluid replenishment and replacement components further includes a second sub-end plate; the second sub-end plate is in close contact with the outermost single battery cell in the housing and is fixedly connected to the first sub-end plate.

[0180] Furthermore, the second sub-end plate is fixedly connected to the first sub-end plate by screws; a gasket is provided between the second sub-end plate and the first end plate, and the screw head passes through the second sub-end plate and the gasket in sequence to connect with the first sub-end plate.

[0181] Furthermore, the fourth blocking piece is a plug provided with external threads; the fourth blocking piece and the fifth blocking piece have the same structure.

[0182] Furthermore, the second explosion relief mechanism is an explosion relief membrane.

[0183] Furthermore, the repair mechanism is a slow-release lithium replenishing device; the electrolyte shared chamber is located at the bottom of the shell, and the slow-release lithium replenishing device is arranged in the electrolyte shared chamber;

[0184] The slow-release lithium replenishment device includes an outer shell and lithium salt particles disposed within the outer shell. The outer shell is insoluble in electrolyte and has at least one micropore on its sidewall to slowly release lithium ions from the lithium salt particles into the electrolyte within the outer shell. This enables continuous and slow lithium replenishment of large-capacity batteries, avoiding the defects of lithium dendrites and SEI film instability that can occur after adding a large amount of lithium ions all at once.

[0185] Furthermore, the lithium salt particles are selected from inorganic lithium salts that are difficult to dissolve in the electrolyte. When the inorganic lithium salt is dissolved in the electrolyte, it has a larger dosage and a lower solubility in the electrolyte. The released lithium ions can make up for the loss of active lithium in the large-capacity battery, and can also repair the SEI film and extend the cycle life of the large-capacity battery.

[0186] Furthermore, the outer shell is made of a plastic outer shell that is easy to process and has low cost.

[0187] Furthermore, one end of the slow-release lithium replenishing device is detachably sealed and mounted on the side wall or end of the hollow component. The slow-release lithium replenishing device with this structure can be replaced with a new one after the lithium salt particles in the outer shell are consumed.

[0188] Furthermore, the sustained-release lithium supplement device also includes a sealing cover fixedly connected to the outer shell, the sealing cover has an external thread, and the side wall or end of the outer shell is provided with a through hole with an internal thread. The sealing cover is connected to the through hole of the outer shell through a thread, and a sealing gasket is installed at the threaded connection to achieve sealing.

[0189] Furthermore, one end of the slow-release lithium supplement device is fixedly mounted on a side wall or an end portion of the housing.

[0190] Furthermore, the sustained-release lithium supplement device also includes a fixed block, which is provided with a mounting column. The outer shell is sleeved on the mounting column. The side wall or end of the outer shell is integrally provided with a mounting base. The fixed block is interference fit into the through hole of the mounting base, and the fixed block is welded to the inner wall of the through hole of the mounting base.

[0191] Furthermore, the positive terminals of all the single cells are connected as a total positive electrode, and the negative terminals of all the single cells are connected as a total negative electrode;

[0192] The repair mechanism includes an automatic lithium replenishing device; the automatic lithium replenishing device includes a lithium source, a lithium replenishing wire, a resistor and an induction switch;

[0193] The lithium source is placed in the electrolyte shared chamber; one end of the lithium replenishment wire extends into the shell and is connected to the lithium source, and the other end of the lithium replenishment wire extends out of the shell and is connected to the total negative electrode, and the lithium replenishment wire located outside the shell is provided with an induction switch and a resistor in sequence from the total negative electrode to the lithium source. The induction switch is used to detect the discharge electrical signal of the large-capacity battery, thereby turning on or off the lithium replenishment wire. The lithium replenishment device can realize automatic lithium replenishment during the operation of the battery, and has a high lithium replenishment efficiency compared to manual control of lithium replenishment. In addition, by controlling the lithium replenishment of the battery during the discharge stage through the induction switch, the service life of the lithium source is longer than the existing continuous lithium replenishment, thereby improving the cycle life of the battery. Third, the automatic lithium replenishment device has a high lithium source utilization rate, which effectively avoids the lithium plating phenomenon caused by long-term lithium replenishment, thereby further improving the cycle life of the battery.

[0194] Furthermore, the above-mentioned sensing switch is a current sensing switch for detecting the direction of current in the connecting cable between the battery and the external load.

[0195] Furthermore, in order to better control the lithium replenishment current and improve the lithium replenishment effect, the above-mentioned resistor is a sliding rheostat.

[0196] Furthermore, the lithium source includes two copper mesh layers and a metal lithium layer arranged between the two copper mesh layers.

[0197] Furthermore, the automatic lithium replenishing device further comprises a lithium replenishing power supply, which is used to apply a voltage between the lithium source and the negative electrode during the battery discharge phase so that the lithium replenishing current remains constant.

[0198] A second aspect of the present invention provides a repair mechanism connected to a large-capacity battery for repairing a large-capacity battery that has experienced capacity degradation or for suppressing the rate of degradation, thereby improving the performance and cycle life of the large-capacity battery. The repair mechanism is any of the above-described repair mechanisms and will not be further described herein.

[0199] A third aspect of the present invention provides a method for repairing a large-capacity battery assembly, which uses a repair mechanism to repair a large-capacity battery after capacity decay or suppress the decay rate of the large-capacity battery to improve the performance and cycle life of the large-capacity battery.

[0200] Furthermore, after the large-capacity battery is charged and discharged for a set time, the electrolyte is replenished into the electrolyte shared chamber and the inner cavity of each single cell through the liquid injection component, or the electrolyte in the electrolyte shared chamber and the inner cavity of each single cell is replaced.

[0201] Further, the following steps can be performed:

[0202] Initial injection step: During the initial injection of the large-capacity battery, the hydraulic pressure of the electrolyte is used to open the second one-way valve, and the electrolyte enters the inner cavity of the large-capacity battery through the second one-way valve. After the injection is completed, the hydraulic pressure is removed, and the second one-way valve is closed, completing the initial injection operation of the large-capacity battery;

[0203] Rehydration step: The second one-way valve is opened by the hydraulic pressure of the electrolyte, and the electrolyte enters the large-capacity battery through the second one-way valve. At the same time, the first one-way valve is opened by an external force, and the gas in the large-capacity battery is discharged outward through the first one-way valve. After the rehydration is completed, the hydraulic pressure and the external force are removed, and the first and second one-way valves are closed, completing the rehydration operation of the large-capacity battery;

[0204] Liquid replacement steps: First, use air pressure to open the first one-way valve, and gas enters the inner cavity of the large-capacity battery through the first one-way valve. At the same time, use external force to open the second one-way valve, and the electrolyte in the large-capacity battery is discharged through the second one-way valve. After the drainage is completed, remove the air pressure and external force, and the first and second one-way valves are closed;

[0205] Subsequently, the second one-way valve is opened by the hydraulic pressure of the electrolyte, and the electrolyte enters the large-capacity battery through the second one-way valve. At the same time, the first one-way valve is opened by external force, and the gas in the large-capacity battery is discharged outward through the first one-way valve, completing the liquid replacement operation of the large-capacity battery.

[0206] Furthermore, the method further includes a vacuuming step: before the initial liquid injection of the large-capacity battery, an external force is used to open the first one-way valve or the second one-way valve, and the vacuuming device is turned on to perform a vacuuming operation on the large-capacity battery.

[0207] Furthermore, the method further includes a formation and exhaust step: after the initial liquid injection of the large-capacity battery is completed, the large-capacity battery is started to be formed. During this process, an external force is used to open the first one-way valve. The gas generated in the large-capacity battery during this formation process is discharged to the outside through the first one-way valve, thereby completing the formation and exhaust operation.

[0208] Further, the following steps can be performed:

[0209] S1. Connecting: Connect the liquid replacement interface of the liquid replacement device to the liquid replacement connector of the lithium-ion battery;

[0210] S2, opening the hole: rotating the opening component to the replacement fluid interface;

[0211] The push assembly provides a linear thrust to move the opening assembly toward the replacement fluid interface, and the opening assembly forms an opening on the replacement fluid connector of the lithium-ion battery; the push assembly and the opening assembly return to their initial positions;

[0212] S3. Fluid replacement: The rotating assembly rotates the fluid replacement assembly to the fluid replacement interface; the pushing assembly provides linear thrust to move the fluid replacement assembly toward the fluid replacement interface, so that the fluid replacement assembly docks with the opening formed on the lithium-ion battery fluid replacement connector. Subsequently, the fluid replacement assembly performs fluid replenishment or replacement operations on the lithium-ion battery; the pushing assembly and the fluid replacement assembly return to their initial positions;

[0213] S4. Sealing: The rotating assembly rotates the sealing assembly to the replacement fluid interface; the pushing assembly provides linear thrust to move the sealing assembly toward the replacement fluid interface. Under the action of the pushing assembly, the sealing assembly squeezes the sealing plug into the opening of the lithium-ion battery replacement fluid connector to seal the replacement fluid connector of the large-capacity battery; the pushing assembly and the sealing assembly return to their initial positions;

[0214] S5. Disassembly and separation: disassemble and separate the liquid replacement interface of the liquid replacement device and the liquid replacement connector of the lithium-ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0215] FIG1 is a schematic structural diagram of a large-capacity battery in the background art;

[0216] FIG2 is a schematic diagram of a partial structure of a large-capacity battery in Example 1;

[0217] FIG3 is a schematic structural diagram of the impurity removal component in Example 1;

[0218] FIG4 is a schematic diagram of a partial structure of a large-capacity battery in Example 2;

[0219] FIG5 is a graph showing the battery capacity retention rate in Example 5, wherein the abscissa represents the number of cycles and the ordinate represents the capacity retention rate;

[0220] FIG6 is a schematic structural diagram of a large-capacity battery in Example 6;

[0221] FIG7 is a partial exploded view of a large-capacity battery in Example 6;

[0222] FIG8 is a cross-sectional view of a large-capacity battery in Example 6;

[0223] FIG9 is a partial exploded view of the end plate assembly from one perspective in Example 6;

[0224] FIG10 is a partial exploded view of the end plate assembly in Example 6 from another perspective;

[0225] FIG11 is a partial exploded view of an end plate assembly in some embodiments;

[0226] FIG12 is a schematic structural diagram of an end plate assembly having a second sub-end plate in Example 6;

[0227] FIG13 is a schematic structural diagram of a large-capacity battery in Example 7;

[0228] FIG14 is a cross-sectional view of a large-capacity battery in Example 7;

[0229] FIG15 is a partial exploded view of the end plate assembly from one perspective in Example 7;

[0230] FIG16 is a partial exploded view of the end plate assembly from another perspective in Example 7;

[0231] FIG17 is a schematic structural diagram of another end plate assembly in Example 7;

[0232] FIG18 is a schematic diagram of the partial structure of the end plate assembly in Example 8;

[0233] FIG19 is a cross-sectional view of the end plate assembly in Example 8;

[0234] FIG20 is another cross-sectional view of the end plate assembly in Example 8;

[0235] FIG21 is a schematic diagram of a partial structure of a large-capacity battery in Example 9;

[0236] FIG22 is a partial exploded view of the end plate assembly in Example 9;

[0237] FIG23 is a schematic diagram of a partial structure of a large-capacity battery in Example 10;

[0238] FIG24 is a partial exploded view of the end plate assembly in Example 10;

[0239] FIG25 is a schematic structural diagram of a large-capacity battery in Example 11;

[0240] FIG26 is a cross-sectional view of a large-capacity battery in Example 11;

[0241] FIG27 is a schematic structural diagram of a second cylinder having a liquid injection and replacement member fixed thereto in Example 11;

[0242] FIG28 is a cross-sectional view of the second cylinder to which the fluid injection and replacement member is fixed in Example 11;

[0243] Figure 29 is a schematic structural diagram of the second cylinder in Example 11;

[0244] FIG30 is a schematic structural diagram of a large-capacity battery in Example 12;

[0245] FIG31 is a schematic structural diagram of a second cylinder having a liquid injection and replacement member fixed thereto in Example 12;

[0246] FIG32 is a cross-sectional view of the second cylinder to which the fluid injection and replacement member is fixed in Example 12;

[0247] FIG33 is a schematic diagram of the partial structure of the second cylinder to which the liquid injection and replacement component is fixed in Example 13;

[0248] FIG34 is a schematic structural diagram of the main body of the fluid injection and replacement component in Example 13;

[0249] FIG35 is a schematic diagram of the partial structure of the second cylinder to which the liquid injection and replacement component is fixed in Example 14;

[0250] FIG36 is a schematic structural diagram of the main body of the fluid injection and replacement component in Example 14;

[0251] FIG37 is an exploded view of the fluid injection component in Example 15;

[0252] FIG38 is a partial exploded view of the fluid injection component in Example 15;

[0253] FIG39 is a schematic structural diagram of a fluid injection and replacement component according to Example 16;

[0254] FIG40 is a schematic structural diagram of the main body of the fluid injection and replacement component in Example 16;

[0255] FIG41 is an exploded view of the fluid injection and replacement component of Example 16;

[0256] FIG42 is a partial enlarged schematic diagram of the fluid injection and replacement component of Example 16;

[0257] FIG43 is a schematic structural diagram of a fluid injection and replacement component according to Example 17;

[0258] FIG44 is a cross-sectional view of the main body of the fluid injection component of Example 18;

[0259] FIG45 is a cross-sectional view of a fluid injection component according to Example 18;

[0260] FIG46 is a schematic structural diagram of the main body of the fluid injection and replacement component in Example 19;

[0261] FIG47 is a schematic structural diagram of the main body of the fluid injection and replacement component in Example 20;

[0262] FIG48 is a schematic structural diagram of a large-capacity battery according to Example 21;

[0263] FIG49 is a schematic diagram of a portion of the structure of a large-capacity battery according to Example 21;

[0264] FIG50 is a cross-sectional view of a large-capacity battery according to Example 21;

[0265] FIG51 is a schematic structural diagram of a large-capacity battery according to Example 22;

[0266] FIG52 is a cross-sectional view of a large-capacity battery according to Example 22;

[0267] FIG53 is a schematic diagram of a portion of the structure of a large-capacity battery according to Example 22;

[0268] FIG54 is a schematic structural diagram of a fluid injection and replacement component according to Example 23;

[0269] FIG55 is an exploded view of the fluid injection and replacement component of Example 23;

[0270] FIG56 is a cross-sectional view of a fluid injection component according to Example 23;

[0271] FIG57 is a cross-sectional view of another fluid injection component of Example 23;

[0272] FIG58 is a cross-sectional view of an electrolyte circulation pipe section additionally provided with a liquid replacement component in Example 23;

[0273] FIG59 is a schematic diagram of the installation structure of the fluid injection and replacement component in Example 23;

[0274] FIG60 is a schematic structural diagram of an additional electrolyte circulation pipe section liquid replacement component in Example 23;

[0275] FIG61 is a schematic diagram of the structure of the liquid injection and replacement component connected to the quick-connect connector in Example 23;

[0276] FIG62 is a cross-sectional view of a fluid injection component according to Example 24;

[0277] FIG63 is an exploded view of the fluid injection and replacement component of Example 25;

[0278] FIG64 is a schematic structural diagram of a fluid injection and replacement component according to Example 25;

[0279] FIG65 is a schematic structural diagram of a fluid injection and replacement component according to Example 26;

[0280] FIG66 is a cross-sectional view of a fluid injection component according to Example 26;

[0281] FIG67 is a cross-sectional view of another fluid injection component of Example 26;

[0282] FIG68 is a schematic structural diagram of the main body of the fluid injection and replacement component in Example 27;

[0283] FIG69 is a schematic structural diagram of the main body of the fluid injection and replacement component in Example 28;

[0284] Figure 70 is a schematic structural diagram of a large-capacity battery according to Example 29;

[0285] FIG71 is a schematic diagram of a portion of the structure of a large-capacity battery according to Example 29;

[0286] FIG72 is a schematic structural diagram of a large-capacity battery according to Example 30;

[0287] FIG73 is a schematic diagram of a portion of the structure of a large-capacity battery according to Example 30;

[0288] FIG74 is a schematic structural diagram of a large-capacity battery in Example 31;

[0289] FIG75 is a partial exploded view of a large-capacity battery in Example 31;

[0290] FIG76 is a cross-sectional view of a large-capacity battery in Example 31;

[0291] FIG77 is a partial exploded view of the end plate assembly in Example 31 from one perspective;

[0292] FIG78 is a partial exploded view of the end plate assembly in Example 31 from another perspective;

[0293] FIG79 is a schematic structural diagram of another end plate assembly in Example 31;

[0294] FIG80 is a schematic structural diagram of an end plate assembly having a second sub-end plate in Example 32;

[0295] FIG81 is a schematic structural diagram of the end plate assembly with the second sub-end plate in Example 32 from another perspective;

[0296] FIG82 is a partial exploded view of the end plate assembly in Example 33;

[0297] FIG83 is a schematic structural diagram of a fluid injection and replacement component in Example 34;

[0298] FIG84 is a cross-sectional view of a fluid injection component according to Example 34;

[0299] FIG85 is a schematic structural diagram of a liquid injection and replacement component provided with an electrolyte communication pipe in Example 34;

[0300] FIG86 is a schematic structural diagram of a large-capacity battery according to Example 34;

[0301] FIG87 is a partial exploded view of a large-capacity battery according to Example 34;

[0302] FIG88 is a schematic structural diagram of a large-capacity battery provided with heat transfer tubes according to Example 34;

[0303] FIG89 is a schematic diagram of the installation structure of the fluid injection and replacement component and the end plate in Example 34;

[0304] FIG90 is an exploded view of the fluid injection component and the end plate in Example 34;

[0305] FIG91 is a schematic structural diagram of a fluid injection and replacement component in Example 35;

[0306] FIG92 is a cross-sectional view of a fluid injection component according to Example 35;

[0307] FIG93 is a schematic structural diagram of a fluid injection and replacement component according to Example 36;

[0308] FIG94 is a cross-sectional view of a fluid injection component according to Example 36;

[0309] FIG95 is a partial exploded view of the fluid injection component of Example 36;

[0310] Figure 96 is a schematic structural diagram of a large-capacity battery according to Example 36;

[0311] FIG97 is a schematic structural diagram of a fluid injection and replacement component according to Example 37;

[0312] FIG98 is a partial exploded view of the fluid injection component of Example 37;

[0313] FIG99 is a cross-sectional view of a fluid injection component according to Example 37;

[0314] Figure 100 is a schematic structural diagram of a large-capacity battery according to Example 37;

[0315] FIG101 is a schematic structural diagram of a fluid injection and replacement component in Example 38;

[0316] FIG102 is a cross-sectional view of a fluid injection component according to Example 38;

[0317] FIG103 is an enlarged view of area a in FIG102;

[0318] FIG104 is a schematic structural diagram of a fluid injection and replacement component connected to an electrolyte communication pipe section in Example 38;

[0319] FIG105 is a schematic structural diagram of a lithium-ion battery according to Example 38;

[0320] FIG106 is a partial exploded view of the lithium-ion battery of Example 38;

[0321] FIG107 is a schematic structural diagram of a lithium-ion battery provided with a heat transfer tube according to Example 38;

[0322] FIG108 is an exploded view of the fluid injection component and the end plate in Example 38;

[0323] FIG109 is a cross-sectional view of a fluid injection component according to Example 39;

[0324] FIG110 is an enlarged view of area b in FIG109;

[0325] FIG111 is a cross-sectional view of a fluid injection component according to Example 40;

[0326] FIG112 is a cross-sectional view of a fluid injection / exchange component provided with a second sealing plug according to Example 40;

[0327] FIG113 is a cross-sectional view of a fluid injection component according to Example 41;

[0328] FIG114 is a schematic diagram of the structure of a large-capacity battery in Example 42;

[0329] FIG115 is a schematic structural diagram of the first one-way valve in Example 42;

[0330] FIG116 is an exploded view of a large-capacity battery with a plugging cap and a pressure relief valve in Example 42;

[0331] FIG117 is a cross-sectional view of the first and second one-way valves in cooperation with the plugging cap and the pressure relief valve in Example 42;

[0332] FIG118 is a partial enlarged schematic diagram of FIG117 ;

[0333] FIG119 is a second partial enlarged schematic diagram of FIG117;

[0334] FIG120 is a schematic diagram of the drainage of a large-capacity battery during liquid replenishment in Example 42;

[0335] FIG121 is a schematic diagram of the injection of liquid when replacing the liquid in a large-capacity battery in Example 42;

[0336] FIG122 is a cross-sectional view of the first and second one-way valves in cooperation with the first and second connecting pipes in Example 42;

[0337] FIG123 is a partial enlarged schematic diagram of FIG122;

[0338] FIG124 is a schematic diagram showing the connection between the fluid replenishing and exchanging device and the large-capacity battery in Example 43;

[0339] FIG125 is a schematic diagram of an explosion diagram of the connection between the fluid replenishing and exchanging device and the large-capacity battery in Example 43;

[0340] FIG126 is a cross-sectional view of the embodiment after the first replenishing fluid connector and the second replenishing fluid connector are connected;

[0341] FIG127 is a schematic diagram of a first replacement fluid connector having an electrolyte pipe segment according to an embodiment;

[0342] Figure 128 is a schematic diagram of the structure of the fluid replenishment device in Example 43;

[0343] FIG129 is a schematic structural diagram of the fluid replenishment and replacement device (outer housing omitted) in Example 43;

[0344] FIG130 is a schematic diagram of the installation of the opening assembly in the fluid replenishment and replacement device of Example 43;

[0345] FIG131 is a schematic diagram of the structure of the opening assembly in the fluid replenishment and replacement device of Example 43;

[0346] FIG132 is a schematic diagram illustrating the installation of a fluid replacement assembly and a sealing assembly in the fluid replacement device of Example 43;

[0347] FIG133 is a schematic structural diagram of the fluid replacement assembly in the fluid replacement device of Example 43;

[0348] FIG134 is a schematic diagram of the structure of the sealing assembly in the fluid replenishment and replacement device in Example 43;

[0349] FIG135 is a schematic diagram of the structure of the fluid injection and explosion relief components in Example 44;

[0350] FIG136 is a schematic diagram of the explosion of the fluid injection and explosion relief components in Example 44;

[0351] FIG137 is a cross-sectional view of the fluid injection and explosion relief components in Example 44;

[0352] FIG138 is a schematic diagram of the structure of the liquid injection and explosion relief components provided with an electrolyte communication pipe in Example 44;

[0353] FIG139 is a schematic structural diagram of the explosion relief pipe component in Example 44;

[0354] Figure 140 is a schematic diagram of the structure of the lithium-ion battery in Example 44;

[0355] FIG141 is a schematic diagram of a partial explosion of a lithium-ion battery in Example 44;

[0356] FIG142 is a schematic structural diagram of a lithium-ion battery equipped with a heat transfer tube in Example 44;

[0357] FIG143 is a partial cross-sectional view of the lithium-ion battery in Example 44;

[0358] FIG144 is a schematic diagram of the explosion structure of the fluid injection and explosion relief components and the end plate in Example 44;

[0359] FIG145 is a schematic diagram of the installation structure of the fluid injection and explosion relief components and the end plate in Example 44;

[0360] FIG146 is a cross-sectional view of a fluid injection component in Example 45;

[0361] FIG147 is a schematic structural diagram of a fluid injection and replacement component in Example 45;

[0362] FIG148 is a cross-sectional view of the fluid injection and explosion relief components in Example 45;

[0363] FIG149 is a schematic diagram of the structure of Example 45 provided with an electrolyte communication pipe and a gas communication pipe;

[0364] FIG150 is a partial cross-sectional view of the lithium-ion battery in Example 45;

[0365] FIG151 is a schematic diagram of the structure of a large-capacity battery in Example 46;

[0366] FIG152 is a cross-sectional view of a large-capacity battery in Example 46;

[0367] FIG153 is a perspective schematic diagram of the first end plate assembly in Example 46;

[0368] Figure 154 is a cross-sectional view of Figure 153;

[0369] FIG155 is a perspective schematic diagram of a second end plate assembly in Example 46;

[0370] Figure 156 is a cross-sectional view of Figure 155;

[0371] FIG157 is a perspective schematic diagram of the end plate assembly in Example 47;

[0372] FIG158 is a first structural diagram of a large-capacity battery in Examples 48 and 49;

[0373] FIG159 is a second structural diagram of a large-capacity battery in Examples 48 and 49;

[0374] Figure 160 is a schematic structural diagram of the sustained-release lithium supplement device in Examples 48 and 49;

[0375] FIG161 is a schematic diagram of the connection between the sustained-release lithium supplement device and the hollow member in Examples 48 and 49;

[0376] FIG162 is a schematic diagram of the structure of a large-capacity battery in Examples 48 and 49;

[0377] FIG163 is a schematic diagram of a large-capacity battery (omitting the first cover plate) in Examples 48 and 49;

[0378] FIG164 is a first schematic diagram of the automatic lithium replenishment device of Example 50 applied to a square lithium-ion single cell battery;

[0379] FIG165 is a second schematic diagram of the automatic lithium replenishment device of Example 50 applied to a square lithium-ion single cell battery;

[0380] FIG166 is a first schematic diagram of the automatic lithium replenishment device of Example 51 applied to a square lithium-ion single cell battery;

[0381] FIG167 is a second schematic diagram of the automatic lithium replenishment device of Example 51 applied to a square lithium-ion single cell battery;

[0382] FIG168 is a graph showing the capacity variation trends of the control sample, the charging lithium-replenishing sample, and the discharging lithium-replenishing sample after 400 cycles;

[0383] FIG169 is a graph showing the capacity retention rate variation trends of the comparative sample, the charge-lithium replenished sample, and the discharge-lithium replenished sample after 400 cycles;

[0384] Figure 170 is a schematic diagram of the structure of a large-capacity battery in Example 52;

[0385] Figure 171 is a schematic diagram of the structure of a large-capacity battery in Example 53;

[0386] FIG172 is a schematic diagram of the structure of a large-capacity battery in Example 54;

[0387] Figure 173 is a structural schematic diagram of the fluid injection and replacement component fixed on the lithium-ion battery housing in Example 55.

[0388] FIG174 is a partial exploded view of the liquid injection and replacement component fixed to the lithium-ion battery housing in Example 55;

[0389] FIG175 is a schematic structural diagram of another fluid injection and replacement component in Example 55;

[0390] FIG176 is a partial exploded view of a fluid injection / exchange component with elastic blocking columns in some other embodiments;

[0391] FIG177 is a schematic diagram of the structure of a fluid injection and replacement component fixed to a lithium-ion battery housing in Example 56;

[0392] FIG178 is a partial exploded view of another fluid injection component in Example 56;

[0393] FIG179 is a schematic structural diagram of the main body of the fluid injection and replacement component in Example 57;

[0394] Figure 180 is a schematic structural diagram of the main body of the fluid injection and replacement component in Example 58;

[0395] FIG181 is a schematic diagram of the structure of the liquid injection and replacement component body fixed to the lithium-ion battery housing in Example 59;

[0396] FIG182 is a first cross-sectional view of the fluid injection component in Example 59;

[0397] FIG183 is a second cross-sectional view of the fluid injection component in Example 59;

[0398] FIG184 is a schematic structural diagram of a fluid injection and replacement component in Example 60;

[0399] FIG185 is a schematic diagram of the partial structure of the fluid injection and replacement component in Example 61;

[0400] FIG186 is an exploded view of the fluid injection and replacement component in Example 61;

[0401] Figure 187 is a partial exploded view of the fluid injection component and the cap in Example 61.

[0402] The accompanying drawings are denoted as follows:

[0403] 01. Sub-pipeline; 02. Intermediate connecting pipe; 03. Lower cover of single battery;

[0404] 1. Housing; 11. Housing bottom plate; 12. Housing top plate; 13. Avoidance hole; 2. Single cell; 21. Terminal; 3. Debris removal member; 31. Second through hole; 4. Electrolyte shared chamber; 6. Terminal adapter; 61. Terminal adapter body; 8. Position limiting guide boss; 9. Gas chamber;

[0405] 23. First cylinder; 231. First cylinder bottom plate; 232. First cylinder top plate; 24. End plate assembly; 241. First sub-end plate; 2411. Electrolyte flow channel; 2412. Outer surface of first sub-end plate; 2413. Opening device operation port; 2414. Gas flow channel; 242. Fluid injection and replacement component; 2421. Fluid injection and replacement component body; 24211. First channel; 24212. Second channel; 2422. Blocking member; 24221. Elastic blocking column; 243. Second sub-end plate ; 244, gasket; 245, annular fixing member; 246, rotating member; 26, first explosion relief channel; 27, explosion relief port; 28, third sub-end plate; 29, fourth sub-end plate; 210, first step surface; 211, second step surface; 212, third step surface; 213, sealing plate; 214, first hot melt member; 215, sealing ring; 216, positioning block; 217, third through hole; 218, first identifier; 219, second identifier; 220, third identifier; 222, fourth through hole;

[0406] 331, second cylinder; 311, first side wall; 3112, outer surface of first side wall; 3113, first blind hole; 362, cover cap; 363, hollow member; 364, first rubber ring; 365, second hot melt member; 37, cavity;

[0407] 4113, countersunk hole; 42, lithium-ion battery housing; 47, first hydraulic quick connector body; 48, second hydraulic quick connector body;

[0408] 511, annular limiting boss; 52, electrolyte flow pipe section; 5421, mounting hole; 58, partition; 59, mounting space; 591, reinforcing rib; 513, countersunk hole;

[0409] 6121, large hole of stepped through hole; 6122, small hole of stepped through hole; 663, quick-connect connector; 641, annular fold; 616, groove; 617, notch; 618, blocking column; 65, first sealing plate;

[0410] 74211, second channel; 7422, second blocking piece; 74222, second hydraulic quick connector body; 745, gas injection and exhaust component; 7451, gas injection and exhaust component body; 74511, first channel; 7452, first blocking piece; 74522, first hydraulic quick connector body;

[0411] 83. First one-way valve; 84. Second one-way valve; 85. Plug cap; 86. Pressure relief valve; 87. First connecting pipe; 88. Second connecting pipe; 89. Fluid replenishing device; 811. First opening; 812. Second opening; 831. Fixing sleeve; 832. Sealing sleeve; 833. Third sealing plate; 834. Sealing column; 835. Spring stop plate; 836. Positioning plate; 837. Spring baffle; 838. Compression spring; 8311. First step hole; 8312. Annular sealing notch; 8321. Annular boss; 861. Internal Pipe section; 862, top pressure plate; 863, outer pipe section; 864, pressure relief membrane; 865, first sealing ring; 8611, annular step; 8631, annular clamping platform; 881, second pipe section; 882, push plate; 883, first pipe section; 884, second sealing ring; 8811, annular protrusion; 8831, second step hole; 891, inert gas source; 892, gas pipeline; 893, gas collection device; 894, electrolyte storage device; 895, electrolyte collection device; 896, liquid pipeline; 897, stop valve;

[0412] 91. Fluid exchange device; 92. High-capacity battery; 93. First fluid exchange connector; 94. Second fluid exchange connector; 911. Outer box; 912. Rotating assembly; 913. Pushing assembly; 914. Opening assembly; 915. Fluid exchange assembly; 916. Sealing assembly; 9111. Lower chamber; 9112. Upper cover; 9113. Fluid exchange interface; 9114. Support plate; 9115. Guide Sleeve; 9121, turntable; 9122, rotating shaft; 9123, rotating motor; 9124, screw; 9125, bearing; 9131, push motor; 9132, push rod; 9133, gear; 9134, rack; 9141, mounting sleeve; 9142, mounting rod; 9143, drilling motor; 9144, drill chuck; 9145, auger; 9146, drilling positioning spring Spring; 9151, liquid injection inner cylinder; 9152, liquid injection outer cylinder; 9153, liquid injection spring; 9154, tapered nozzle; 9155, long strip through groove; 9161, sealing spring; 9162, sealing cylinder; 9163, sealing push rod; 9164, sealing plug; 931, joint body; 932, first connecting flange; 933, first sealing boss; 934, annular boss; 935, channel; 936, annular chamfer; 937, electrolyte pipe section; 938, annular limiting boss; 939, rubber ring; 9341, first sealing surface; 9351, ninth channel; 9352, tenth channel; 941, connecting sleeve; 942, second connecting flange; 943, second sealing boss; 944, annular notch; 945, first sealing ring; 946, second sealing ring; 9441, second sealing surface;

[0413] 101, fluid injection / exchange component; 1011, fluid injection / exchange component body; 10112, third channel; 10113, fourth channel; 10114, first blind hole; 10115, second blind hole; 10116, third blind hole; 10117, fifth through hole; 10118, sixth through hole; 1012, third blocking member; 1013, electrolyte connecting pipe; 1014, gas connecting pipe; 102, explosion venting pipe component; 1021, explosion venting pipe; 1022, explosion venting membrane; 1033, end plate; 10331, first mounting hole; 1034, support member; 105, heat transfer pipe;

[0414] 111, fluid injection component body; 1112, fifth channel; 11121, large hole; 11122, small hole; 1113, first pipe; 11131, free end of first pipe; 1115, sealant layer; 1117, sixth channel; 1118, second pipe; 11181, free end of second pipe; 1131, second mounting hole; 1124, first explosion relief mechanism; 113, sealing plug; 11310, O-ring; 1132, blind hole; 114, sealing end cap; 1141, sealing gasket;

[0415] 121, fluid injection component body; 1212, seventh channel; 12120, small hole; 12122, large hole; 12121, limit ring; 1213, eighth channel; 122, sealing unit; 1221, first sealing plug; 1222, sealing coating; 1223, second sealing plug; 1244, third mounting hole;

[0416] 132. Hollow member; 133. Slow-release lithium replenishing device; 1321. Shared chamber; 1322. Sub-pipeline; 1323. Hollow box; 1324. Cover plate; 1325. U-shaped housing; 1326. First cover plate; 1327. Third cover plate; 1328. Second cover plate; 13210. Mounting base; 1332. Lithium salt particles; 1333. Sealing cover; 1334. Fixing block; 1335. Mounting column; 13311. Micropore; 1331. Outer housing;

[0417] 14411, connecting channel; 14412, groove; 14413, blocking plate; 146, functional interface; 1461, columnar body; 14611, liquid channel; 14612, gas channel; 14613, second explosion relief channel; 1462, second explosion relief mechanism; 1463, fourth blocking member; 1464, fifth blocking member;

[0418] 151. Lithium source; 152. Lithium replenishment wire; 153. Resistor; 154. Inductive switch; 155. Prismatic lithium-ion battery; 156. Load; 157. Lithium replenishment power source; 158. Hollow pipe; 1512. Outer box; 1513. Bare battery cell; 1514. Housing; 1515. Upper cover; 1516. Post. DETAILED DESCRIPTION

[0419] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0420] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0421] In the description of the present invention, it should be noted that the terms "top," "bottom," and so on, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," "third," "fourth," and so on, are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0422] Examples 1 to 5 provide a large-capacity battery assembly, including a shell, a repair mechanism, and a plurality of single cells arranged in the shell. The inner cavity of each single cell includes an electrolyte area and a gas area; a shared electrolyte chamber is provided on the shell; the shared electrolyte chamber is connected to the electrolyte area in the inner cavity of each single cell; a avoidance hole is provided on the top plate of the shell to allow the poles of each single cell to extend out; the poles of each single cell extend out of the avoidance hole on the top plate of the shell, and the shell area corresponding to the avoidance hole is fixedly sealed with the shell of the single cell. The repair mechanism can be provided inside or outside the shell, and the large-capacity battery whose capacity has decayed is repaired based on the repair mechanism to improve the performance and service life of the large-capacity battery. In addition, the repair mechanism can be provided as an integral part of the large-capacity battery or separately, and when repair is needed, it can be connected to the large-capacity battery.

[0423] Examples 1 to 5 utilize the repair mechanism to improve the performance and cycle life of high-capacity batteries in at least the following ways:

[0424] On the one hand, it can inhibit the reduction of active lithium in large-capacity batteries; on the other hand, it can replenish or replace the electrolyte in large-capacity batteries; on the third hand, it can inhibit the formation of lithium dendrites in each single cell; on the fourth hand, it can thin the thickened SEI.

[0425] It should be noted that the above-mentioned pole of the single battery 2 may refer to the original pole 21 of the single battery 2 , or may be a pole component obtained by adding a pole adapter 6 to the original pole 21 of the single battery 2 .

[0426] The following describes embodiments 1 to 5 in detail with reference to the accompanying drawings.

[0427] Example 1

[0428] The large-capacity battery of this embodiment is shown in Figure 2 and includes a rectangular housing 1. For ease of description, the length of the housing 1 can be defined as the x-direction, the width of the housing 1 as the y-direction, and the height of the housing 1 as the z-direction. Twelve single cells 2 are arranged along the x-direction within the rectangular housing 1 (in other embodiments, the number of single cells 2 can be adjusted as needed). The single cells 2 described here can be square-cased batteries, which include an upper cover, a lower cover, a barrel, and a cell assembly; the cell assembly described here can also be referred to as an electrode assembly, which consists of a positive electrode, a separator, and a negative electrode arranged in sequence and assembled using a lamination or winding process. The upper cover, barrel, and lower cover form the housing of the single cell 2, and the cell assembly is disposed within the housing of the single cell 2.

[0429] In this embodiment, a repair mechanism is provided between the bottom plate 11 of the outer shell and the bottom of each single cell 2. The repair mechanism in this embodiment is an impurity removal component 3. As can be seen from FIG2 (the end plates at both ends of the large-capacity battery are removed in FIG2 ), there are two impurity removal components 3 in this embodiment, which are respectively located on both sides of the electrolyte shared chamber 4 and extend along the x-direction. Both impurity removal components 3 are hollow structures, and their inner cavities are filled with impurity removal materials. A second through hole 31 is provided on the impurity removal component 3 that passes through its inner cavity and allows the electrolyte to pass through; wherein the impurity removal material can be at least one of 4A molecular sieve, lithiated molecular sieve or α-alumina. During the operation of the large-capacity battery, the impurity removal material is always immersed in the electrolyte to remove impurities in the electrolyte, avoid the influence of impurities on the performance of the electrolyte, and thereby improve the charge and discharge cycle performance of such large-capacity batteries.

[0430] When the original poles 21 of each single battery 2 need to extend out of the avoidance holes 13 on the top plate 12 of the outer shell, the size of the impurity removal component 3 in the z direction needs to meet the following requirements: after the impurity removal component 3 is used to support each single battery 2, it is necessary to ensure that the original poles 21 of each single battery 2 extend out of the avoidance holes 13 opened on the top plate 12 of the outer shell.

[0431] When the original poles 21 of each single battery 2 are no longer required to extend out of the avoidance holes 13 on the top plate 12 of the outer shell (as shown in FIG2 ), the size of the debris removal component 3 in the z direction needs to meet the following requirements: after the debris removal component 3 is used to support each single battery 2, it is necessary to ensure that the original poles 21 of each single battery 2 are in contact with the electrical connection part of the pole adapter 6.

[0432] In some other embodiments, only one impurity removal component 3 may be provided, extending along the x-direction and located on one side of the electrolyte shared chamber 4; on the other side of the electrolyte shared chamber 4, a supporting component may be provided, which may be a solid component and only serves as a support. However, compared with this embodiment, its impurity removal efficiency is lower.

[0433] In some other embodiments, the impurity removal component 3 can also be directly arranged in the electrolyte sharing chamber 4. In order not to affect the smooth unpacking of each single battery 2 and the effect of electrolyte sharing, the structural dimensions of the impurity removal component 3, the electrolyte sharing chamber 4 and the unpacking device need to meet specific requirements.

[0434] As can be seen in Figure 3, the impurity removal member 3 of this embodiment is a hollow box with a rectangular cross-section, extending along the x-direction and having the same length as the outer shell 1. The impurity removal member 3 can be made of the same material as the outer shell 1, such as aluminum. The wall thickness can be minimized while ensuring sufficient support strength to reduce the total weight of such a large-capacity battery.

[0435] In some other embodiments, the impurity removal member 3 may be a hollow box with a semicircular cross-section, wherein the flat bottom surface contacts the housing bottom plate 11 and the curved surface contacts the lower cover of each single cell 2. However, compared with this embodiment, its support stability and structural regularity are lower.

[0436] In other embodiments, each single cell 2 may correspond to a corresponding debris removal member 3. Debris removal members 3 of varying heights may be selected based on the size of the corresponding single cell 2 in the z-direction, ensuring that the original pole 21 of the single cell 2 extends through the avoidance hole 13 of the housing top plate 12, or that the original pole 21 of the single cell 2 contacts the electrical connection portion of the pole adapter 6. However, compared to this embodiment, the assembly process is more complex. After each single cell 2 is pushed into the cylinder, a corresponding debris removal member 3 must be inserted between the bottom of each single cell 2 and the housing bottom plate 11. In most cases, the debris removal members 3 corresponding to each single cell 2 in this manner have different sizes in the z-direction. In this embodiment, multiple single cells 2 are fixed as a whole and pushed into the cylinder cavity from any open end. A lifting fixture is then used to support the multiple single cells 2 from the bottom, separating the bottom of each single cell 2 from the bottom of the cylinder. Subsequently, a long strip of debris removal member 3 is inserted along the x-direction, and the lifting fixture is removed.

[0437] To maximize the amount of impurity removal material, the width of the impurity removal member 3 can be increased as much as possible without compromising the smooth unpacking of the individual cells 2. As shown in Figure 4 , the width of the impurity removal member 3 in this embodiment is the same as the width of the area of ​​the housing floor 11 on either side of the electrolyte shared chamber 4. To position the impurity removal member 3 in the y-direction, a position-limiting guide boss extending in the x-direction is provided on the inner surface of the housing floor 11. The impurity removal member 3 is positioned between the position-limiting guide boss 8 and the sidewall of the housing 1. This position-limiting guide boss also serves as a guide during installation of the impurity removal member 3.

[0438] As can be seen from Figure 3, the second through-holes 31 of this embodiment are formed on two sidewalls of the impurity removal component 3 that are parallel to the xz plane. To ensure that the impurity removal effect is not affected, the size of the limiting guide boss needs to be smaller than that of the impurity removal component 3 in the z direction. In addition, a certain gap can be maintained between the sidewalls of the housing 1 and the impurity removal component 3 to allow the electrolyte to smoothly enter the inner cavity of the impurity removal component 3 and complete the impurity removal.

[0439] In other embodiments, the second through holes 31 may be provided not only on the two side walls of the impurity removal member 3 parallel to the xz plane, but also on the top and bottom surfaces of the impurity removal member 3 parallel to the xy plane. Because the top and bottom surfaces of the impurity removal member 3 respectively contact the bottom of the single cell 2 and the bottom plate 11 of the outer shell, the top surface of the impurity removal member 3 and the bottom of the single cell 2, and the bottom surface of the impurity removal member 3 and the bottom plate 11 of the outer shell are closely attached to each other under the action of the gravity of the single cell 2, making it difficult for electrolyte to pass through. Therefore, providing the second through holes 31 on the top and bottom surfaces does not effectively improve the impurity removal effect of the impurity removal member 3.

[0440] To prevent the impurity removal material within the impurity removal member 3 from diffusing into the interior of each individual battery cell 2 and adsorbing onto the electrode plate or separator, thereby impairing the performance of the individual battery cells 2, the diameter of the second through-hole 31 must be smaller than the particle size of the impurity removal material. Alternatively, the impurity removal material can be wrapped in a filter and then loaded into the impurity removal member 3. The filter prevents the impurity removal material from overflowing the impurity removal member 3. Alternatively, the impurity removal material can be processed into a rod shape or a larger block to solve similar technical problems.

[0441] Under the premise of ensuring the supporting strength of the impurity removal component 3, the number of the second through holes 31 is as large as possible and evenly distributed on the two side walls of the impurity removal component 3 parallel to the xz plane to remove as many impurities in the electrolyte as possible.

[0442] Example 2

[0443] Different from Example 1, the repair mechanism in this embodiment is a fluid injection component arranged on the outer shell, through which electrolyte can be added to the large-capacity battery, gas inside the large-capacity battery can be discharged, or the electrolyte in the large-capacity battery can be replaced.

[0444] For example, a through hole can be opened at the position where the large-capacity battery casing is connected to the electrolyte shared chamber. During the normal charge and discharge cycle of the large-capacity battery, the through hole can be blocked by a sealing member. When fluid replenishment or replacement is required, the sealing member can be removed and the electrolyte can be replenished or replaced in the electrolyte shared chamber through the through hole.

[0445] For example, a through hole can be opened at the position where the large-capacity battery casing is connected to the gas chamber and the electrolyte shared chamber. During the normal charge and discharge cycle of the large-capacity battery, the through hole can be blocked by a sealing member. When liquid replenishment, exhaust or liquid replacement is required, the sealing member can be removed and the electrolyte can be replenished, exhausted or replaced in the large-capacity battery through the through hole.

[0446] It should be noted that, in the same large-capacity battery, the repair mechanism in this embodiment can coexist with the repair mechanism in Example 1, or can be used separately.

[0447] Example 3

[0448] Based on Example 2, this embodiment adds a magnetic stirring device, which includes a magnet and a magnetic stirrer; the magnet is located in the electrolyte shared chamber, and the magnetic stirring device is arranged outside the shell to drive the magnet to rotate and stir the electrolyte.

[0449] After the electrolyte is injected into the electrolyte sharing chamber through the liquid injection component, the magnetic stirrer is turned on to allow the electrolyte injected through the liquid injection component to be evenly mixed with the original electrolyte, or the electrolyte can be evenly mixed with the original electrolyte in the electrolyte sharing chamber after subsequent replenishment of the electrolyte, thereby ensuring the uniformity of lithium ion distribution and thereby improving the performance and cycle life of large-capacity batteries.

[0450] In some other embodiments, the magnetic stirring device can also be used alone in combination with the impurity removal component of Example 1. When used in combination with the impurity removal component, impurities generated in the electrolyte can be fully absorbed and adsorbed by the impurity removal mechanism.

[0451] In some other embodiments, the magnetic stirring device can also be used in conjunction with the impurity removal component of Example 1 and the liquid injection component of Example 2, which can not only ensure the uniform distribution of the electrolyte after injection, but also allow the impurities generated in the electrolyte to be fully absorbed and adsorbed by the impurity removal mechanism.

[0452] Example 4

[0453] Unlike the previous embodiment, this embodiment further comprises a raised portion on the housing top plate 12, away from the housing bottom plate 11, serving as a gas chamber 9. The gas chamber 9 covers the gas port of each single cell 2. The remaining structure is the same as that of the first embodiment and will not be further described here.

[0454] Example 5

[0455] Different from the above embodiment, the impurity removal materials in this embodiment are lithiated molecular sieve and α-alumina, wherein the mass ratio of lithiated molecular sieve and α-alumina is 1:1, and the mass percentage of the impurity removal material in the electrolyte is 3% to 10%.

[0456] Specific experimental data can be found in Figure 5. Eleven high-capacity batteries were selected as experimental samples in Figure 5, designated as Samples 11, 16, 18, 22, 24, 26, 27, 29, 33, 34, and 37. The impurity removal materials in each experimental sample consisted of lithiated molecular sieves and α-alumina, with a mass ratio of 1:1. The mass percentage of the impurity removal materials in the electrolyte varied between the experimental samples. Samples 11 and 16 did not contain any impurity removal materials. As can be seen from the figure, when the mass percentage of the impurity removal materials in the electrolyte was between 3% and 10%, both capacity enhancement and capacity retention were significantly improved.

[0457] Examples 6 to 10 provide a large-capacity battery assembly, including a large-capacity battery and a repair mechanism. The large-capacity battery includes a housing and m parallel-connected single cells arranged within the housing, where m>1. The single cells may be prismatic batteries or multiple commercially available parallel-connected soft-pack batteries. The interior of each single cell includes an electrolyte region and a gas region.

[0458] For the convenience of description, the length direction of the shell is defined as the x direction, the width direction of the shell is defined as the y direction, and the height direction of the shell is defined as the z direction.

[0459] The outer shell is provided with an electrolyte sharing chamber; the electrolyte sharing chamber is connected to the electrolyte area in the inner cavity of each single cell; the repair mechanism is a liquid injection and replacement component; the liquid injection and replacement component is used to replenish electrolyte into the electrolyte sharing chamber and the inner cavity of each single cell, or to replace the electrolyte in the electrolyte sharing chamber and the inner cavity of each single cell.

[0460] It should be noted that Examples 6 to 10 do not include a solution in which the port of the electrolyte shared chamber is used as the injection port.

[0461] The housing can have at least the following two structures:

[0462] The first structure includes a first cylinder with open ends at both ends (i.e., the end portions parallel to the yz plane are open ends) and end plate assemblies respectively fixed to the two open ends of the first cylinder (i.e., the end plate assemblies are parallel to the yz plane);

[0463] The second structure includes a second cylinder with open ends at the top and bottom (i.e., the ports parallel to the xy plane are open ends) and an upper cover plate and a lower cover plate respectively fixed to the open ends of the top and bottom of the second cylinder (i.e., the upper cover plate and the lower cover plate are parallel to the xy plane); in this structure, the side wall of the second cylinder parallel to the yz plane is called an end plate assembly.

[0464] In Examples 6 to 10, the first structure is mainly used as an example for introduction.

[0465] The electrolyte sharing chamber may be located on the side plate of the first cylinder (the side plate parallel to the xz plane) or the bottom plate of the first cylinder.

[0466] It should be noted here that the above-mentioned electrolyte shared chamber is an electrolyte containing chamber. After it is connected with the electrolyte area of ​​the inner cavity of each single battery, it is necessary to ensure that the electrolyte in the entire large-capacity battery does not come into contact with the external environment.

[0467] A gas chamber may also be provided on the top plate of the first cylinder (referred to as the upper cover plate in the second shell structure), and the gas chamber covers the gas port on the top of each single cell in the large-capacity battery. It should be noted that the gas port here includes the following two meanings:

[0468] 1) The gas port is a through hole directly opened on the upper cover of the single cell and passing through the inner cavity of the single cell;

[0469] At this time, the inner cavity of the gas chamber is connected with the gas area of ​​the inner cavity of each single cell through the gas port. The gas chamber serves as a gas sharing chamber for each single cell. Based on the gas chamber, the gas areas of each single cell can be connected to achieve gas balance, so that the gas of each single cell is shared to ensure the consistency of each single cell, which improves the cycle life of the large-capacity battery to a certain extent; when any single cell has thermal runaway, the smoke in the inner cavity of the single cell enters the gas chamber and is discharged through the gas chamber, thereby improving the safety of the large-capacity battery.

[0470] 2) The gas port is an explosion vent or explosion-proof port provided on the upper cover of the single cell, and an explosion vent membrane is provided at the explosion vent or explosion-proof port;

[0471] At this time, the gas chamber is used as the first explosion-proof channel. When the explosion-proof membrane at the gas outlet of any single battery is broken by the internal smoke, the smoke in the internal cavity of the single battery is discharged through the gas chamber, thereby improving the safety of the large-capacity battery.

[0472] In order to improve the heat dissipation performance of such large-capacity batteries, an avoidance hole is opened on the top plate of the first cylinder to allow the polarity terminals of each single battery to extend out; the polarity terminals of each single battery extend out of the avoidance hole and the first cylinder top plate area around the avoidance hole is fixedly sealed with the single battery shell.

[0473] It should be noted that the single cell polarity terminal described here can be a single cell pole. In order to prevent the single cell pole from being unable to smoothly extend out of the avoidance hole as a polarity terminal, a pole adapter can also be connected to the single cell pole, and the overall structure of the single cell pole and the pole adapter can be used as the single cell polarity terminal.

[0474] The liquid injection and replacement component can be fixed at any position of the housing. For example, it can be set on the side wall of the first barrel parallel to the xz plane, or it can be set on the end plate assembly. After the large-capacity battery is charged and discharged for a period of time, the electrolyte decomposes and consumes, resulting in a decrease in the performance of the large-capacity battery. The liquid injection and replacement component can be used to replenish electrolyte into the electrolyte shared chamber and the inner cavity of each single cell to improve the performance of the large-capacity battery. Alternatively, after the large-capacity battery is charged and discharged for a period of time, the electrolyte is affected by the presence of impurities in the electrolyte. The liquid injection and replacement component can also be used to replace the electrolyte in the electrolyte shared chamber and the inner cavity of each single cell to improve the performance of the large-capacity battery. The replacement here can be partial replacement or complete replacement. In addition, after the electrolyte area of ​​each single cell cavity is connected to the electrolyte shared chamber, the liquid injection and replacement component can be used to re-inject electrolyte into the inner cavity of each single cell and the electrolyte shared chamber to ensure the continuity of the electrolyte.

[0475] An opening for an opening device may also be provided on the end plate assembly provided with the fluid injection and replacement member. The opening device extends through the opening into the electrolyte sharing chamber to open each single battery, thereby communicating the electrolyte sharing chamber with the electrolyte area of ​​the inner cavity of each single battery. (Specifically, during opening, the opening device extends through the opening into the electrolyte sharing chamber to open the sealing film sealed at the opening of the lower cover plate of each single battery. The sealing film may be the sealing film disclosed in Chinese patents CN218525645U and CN218525614U.)

[0476] The opening of the package opening device also serves as an explosion vent. After opening the package, the explosion vent is seal-welded to the end plate assembly surrounding the opening. Correspondingly, the other end plate assembly can be a flat plate that seals the other open end of the first cylinder, simultaneously sealing the open end of the electrolyte shared chamber and, if present, the open end of the gas chamber.

[0477] The explosion vent can also be located on another end plate assembly different from the operating port of the package opening device. A first explosion vent channel is provided on the other end plate assembly. The air inlet end of the first explosion vent channel is used to communicate with the gas chamber of the large-capacity battery, and the air outlet end is connected to the explosion vent.

[0478] The following describes Examples 6 to 10 in detail with reference to the accompanying drawings.

[0479] Example 6

[0480] As shown in Figures 6 to 8, this embodiment of a high-capacity battery includes a housing 1 and ten parallel-connected cells 2 within the housing 1. These cells 2 are prismatic. The number of cells in other embodiments can be adjusted based on actual needs. Each cell 2 has a through-hole at the bottom of its housing that extends through its inner cavity.

[0481] The housing 1 includes a first cylinder 23 with open ends at both ends and end plate assemblies 24 respectively fixed to the two open ends of the first cylinder 23;

[0482] An electrolyte sharing chamber 4 extending along the x-direction is provided on the first cylinder bottom plate 231 ; the electrolyte sharing chamber 4 is connected to the electrolyte area in the inner cavity of each single battery 2 through the through hole of the single battery 2 .

[0483] The first cylindrical top plate 232 defines a clearance hole 13 through which the polarity terminals of each battery cell 2 can extend. Each battery cell 2 polarity terminal extends through the clearance hole 13, and the area surrounding the clearance hole 13 on the first cylindrical top plate 232 is securely sealed to the battery cell 2 housing. As can be seen from the figure, in this embodiment, the polarity terminals of the battery cell 2 refer to the integrated structure of the battery cell post 21 and the post adapter 6.

[0484] 9 and 10 , one of the end plate assemblies 24 of this embodiment includes a first sub-end plate 241, which is sealed to the first barrel 23 and one of the open ends of the electrolyte shared chamber 4; an electrolyte flow channel 2411 is provided on the first sub-end plate 241, and a liquid injection component 242 is provided on the outer surface 2412 of the first sub-end plate (wherein the outer surface 2412 of the first sub-end plate refers to the surface of the first sub-end plate 241 that is away from each single battery 2 in the first barrel 23);

[0485] As can be seen from FIG. 10 , in this embodiment, the electrolyte flow channel 2411 is a through hole provided on the first sub-end plate 241 .

[0486] In some other embodiments, the electrolyte flow channel 2411 may also be a through groove opened on the inner surface of the first sub-end plate 241, but compared with this embodiment, it is not easy to extract the electrolyte.

[0487] As shown in FIG9 , the fluid injection component 242 includes a fluid injection component body 2421 and a blocking member 2422 fixed to the fluid injection component body 2421. In this embodiment, the fluid injection component body 2421 is a cylinder. In other embodiments, rectangular columns, semi-cylinders, etc. may also be used. The fluid injection component body 2421 and the first sub-end plate may be integral or separate. If integral, they may be formed using a die-casting process. If separate, the fluid injection component body 2421 may be fixed to the first sub-end plate by welding. A first through-hole is defined in the fluid injection component body 2421 along its axial direction, serving as a first channel 24211, which communicates with the electrolyte flow channel 2411.

[0488] The blocking member 2422 in this embodiment is a cap (which can be a nut) that is buckled onto the main body 2421 of the fluid injection and exchange component and is threadedly connected to the main body 2421 of the fluid injection and exchange component. A sealing ring 215 can be provided at the threaded connection portion to improve the sealing of this portion and block the first channel 24211.

[0489] In some other embodiments, the cap may also be connected to the fluid injection and replacement component body 2421 in an interference fit manner, but compared with this embodiment, disassembly is more difficult.

[0490] In other embodiments, as shown in FIG11 , the sealing member 2422 may further include an elastic sealing column 24221 filled in the first channel 24211 to further ensure the sealing of the first channel 24211. The elastic sealing column 24221 may be made of a rubber material that does not react with the electrolyte, such as fluororubber, nitrile rubber, natural rubber, or EPDM rubber.

[0491] After the end plate assembly 24 is fixed to the open end of the first cylinder 23 , both ends of the electrolyte circulation channel 2411 are communicated with the electrolyte sharing chamber 4 and the first channel 24211 of the liquid injection and replacement component 242 respectively.

[0492] To facilitate unpacking, this embodiment may further include an opening 2413 for an unpacking device on the first sub-end plate 241. The opening device extends through the opening 2413 into the shared electrolyte chamber 4 to unpack each single battery 2, thereby connecting the shared electrolyte chamber 4 with the electrolyte area within each single battery 2. (During unpacking, the opening device extends through the opening 2413 into the shared electrolyte chamber 4 to open the sealing film sealed at the through-holes in the lower cover of each single battery 2. The sealing film may be the sealing film disclosed in Chinese patents CN218525645U and CN218525614U.) It should be noted that after unpacking, the opening 2413 needs to be sealed with a sealing member.

[0493] As shown in FIG12 , in this embodiment, a second sub-end plate 243 may be provided between the first sub-end plate 241 and the outermost single battery cell 2 in the housing 1 . The second sub-end plate 243 is in close contact with the outermost single battery cell 2 and is fixedly connected to the first sub-end plate 241 .

[0494] By adding a second sub-end plate 243, the size of the second sub-end plate 243 along the x-direction can be adjusted to clamp all the single cells 2 in the x-direction, thereby improving the stability of each single cell 2 in the inner cavity of the shell 1. It can also prevent each single cell 2 from swelling, which may lead to a decrease in the cycle performance of large-capacity batteries.

[0495] In this embodiment, screws are used to secure the second sub-end plate 243 to the first sub-end plate 241. A gasket 244 can also be placed between the first sub-end plate 241 and the second sub-end plate 243. The screw heads pass through the second sub-end plate 243 and the gasket 244, respectively, to connect to the first sub-end plate 241. The thickness of the gasket 244 (dimension along the x-direction) can also be adjusted to adjust the thickness of the entire end plate assembly 24, thereby clamping all the single cells 2.

[0496] In some other embodiments, the second sub-end plate 243 and the first sub-end plate 241 may also be connected by rivets, which is more complicated than screws.

[0497] When fluid replacement is needed, follow these steps:

[0498] Remove the cap;

[0499] Insert the electrolyte injection tube into the first channel 24211 and inject the electrolyte. After the electrolyte injection is completed, remove the electrolyte injection tube.

[0500] The cap is sealed and fixed on the liquid injection and replacement component body 2421 to block the first channel 24211.

[0501] When the fluid needs to be changed, follow these steps:

[0502] Remove the cap;

[0503] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte; then, insert the electrolyte injection tube into the first channel 24211 and inject new electrolyte; after the injection is completed, remove the electrolyte injection tube;

[0504] The cap is sealed and fixed on the liquid injection and replacement component body 2421 to block the first channel 24211.

[0505] It should be noted that, in this embodiment, during the liquid injection process, if the pressure in the inner cavity of the housing 1 is too high, the liquid injection may become difficult.

[0506] Example 7

[0507] Different from the sixth embodiment, as shown in FIG. 13 to FIG. 16 , the large-capacity battery of this embodiment has a gas chamber 9 provided on the top plate 232 of the first cylinder; the gas chamber 9 is in communication with the gas area inside the cavity of each single battery 2 .

[0508] Correspondingly, a gas circulation channel 2414 connected to the gas chamber 9 is also provided on the first sub-end plate 241; a second channel 24212 (a first through hole provided on the fluid injection component body 2421) is provided on the fluid injection component body 2421, and the sealing member 2422 is also used to block the second channel 24212.

[0509] As shown in FIG15 and FIG16 , the gas flow channel 2414 of this embodiment is a through hole opened on the first sub-end plate 241;

[0510] In some other embodiments, the gas circulation channel 2414 may also be a through groove opened on the inner surface of the first sub-end plate 241 , but compared with this embodiment, the gas is easily diffused into the entire shell 1 .

[0511] In addition to the cap fastened on the fluid injection and replacement component body 2421, the sealing member 2422 in this embodiment also includes an elastic sealing column 24221 sealed in the first channel 24211 and the second channel 24212, ensuring that the fluid injection and replacement component 242 has better sealing performance during normal charge and discharge cycles.

[0512] After the end plate assembly 24 is fixed to the open end of the first cylinder 23, the two ends of the electrolyte circulation channel 2411 are respectively connected to the electrolyte shared chamber 4 and the first channel 24211 of the liquid injection and replacement component 242, and the two ends of the gas circulation channel 2414 are respectively connected to the gas chamber 9 and the second channel 24212 of the liquid injection and replacement component 242.

[0513] When the end plate assembly also includes a second sub-end plate, the unpacking device operating port 2413 on the first sub-end plate can also serve as an explosion vent 27, and the gap between the first sub-end plate and the second sub-end plate can serve as a first explosion vent channel. The two ends of the first explosion vent channel 26 are respectively connected to the gas chamber 9 and the explosion vent 27, and the explosion vent 27 is sealed with an explosion vent mechanism. A hollow component with an explosion vent membrane at one end can be used as an explosion vent mechanism. When any single cell 2 experiences thermal runaway, the thermal runaway smoke enters the first explosion vent channel 26 from the gas chamber 9, breaks through the explosion vent membrane and is discharged from the explosion vent 27. Based on this type of large-capacity battery assembly as an energy storage device, multiple large-capacity batteries are arranged along the width direction of the large-capacity battery so that the end plate assembly of each large-capacity battery is exposed. When the liquid injection component, the unpacking device operating port 2413 and the explosion vent 27 are set on the end plate assembly, the corresponding operations can be conveniently performed.

[0514] As shown in FIG17 , in some other embodiments, a first explosion relief channel 26 and an explosion relief port 27 may be provided on another end plate assembly 24 (an end plate assembly without a fluid injection / exchange component). The two ends of the first explosion relief channel 26 are connected to the gas chamber 9 and the explosion relief port 27, respectively. The explosion relief port 27 is sealed with an explosion relief mechanism. A hollow component with an explosion relief membrane at one end can be used as the explosion relief mechanism. When any single cell 2 experiences thermal runaway, the thermal runaway smoke enters the first explosion relief channel 26 from the gas chamber 9, breaks through the explosion relief membrane, and is discharged from the explosion relief port 27.

[0515] As can be seen from Figure 17, the other end plate assembly 24 includes a third sub-end plate 28 and a fourth sub-end plate 29. The third sub-end plate 28 and the fourth sub-end plate 29 are parallel to each other, and there is a gap between them (the third sub-end plate 28 is in close contact with the outermost single battery 2 located in the first cylinder 23). In this embodiment, the gap is used as the first explosion-relief channel 26.

[0516] In this embodiment, screws are used to secure the third sub-end plate 28 to the fourth sub-end plate 29. It should be noted that, in order to ensure that the first explosion relief channel 26 is formed between the third sub-end plate 28 and the fourth sub-end plate 29, the length of the screw in the x-direction should be greater than the gap between the third sub-end plate 28 and the fourth sub-end plate 29, and less than the distance between the inner surface of the third sub-end plate 28 and the outer surface of the fourth sub-end plate 29 (the surface closest to each cell 2 is defined as the inner surface). The screw head passes through the third sub-end plate 28 and connects to the fourth sub-end plate 29. In order for the end plate assembly 24 to function as a whole and better squeeze each cell 2, as shown in FIG17 , a gasket 244 is provided between the third sub-end plate 28 and the fourth sub-end plate 29 in this embodiment. The screw head passes through the third sub-end plate 28, the gasket 244, and the fourth sub-end plate 29 in sequence to prevent the gap between the third sub-end plate 28 and the fourth sub-end plate 29 from becoming smaller or even disappearing when squeezing the cell 2.

[0517] When fluid replacement is needed, follow these steps:

[0518] Remove the cap and take out the elastic blocking column 24221 sealed in the first channel 24211 and the second channel 24212;

[0519] When there is gas in the inner cavity of the housing 1, the gas will overflow from the second channel 24212, making it easier to inject liquid into the inner cavity of the housing 1. In order to ensure smoother liquid injection, in this step, an exhaust pipe can be inserted into the second channel 24212, and an external exhaust device connected to the exhaust pipe can be started to exhaust gas, so that a certain negative pressure is formed in the inner cavity of the housing 1.

[0520] Afterwards, the electrolyte injection tube is extended into the first channel 24211 and the electrolyte is injected. During the injection process, if there is a problem of injection difficulty, the external exhaust device can be activated to form a certain negative pressure in the inner cavity of the housing 1 before the injection is continued;

[0521] After the fluid replenishment is completed, the electrolyte injection tube and the air extraction tube are pulled out; the elastic blocking column 24221 is sealed in the first channel 24211 and the second channel 24212, and then the cap is sealed and fixed on the fluid injection and replacement component body 2421.

[0522] When the fluid needs to be changed, follow these steps:

[0523] Remove the cap and take out the elastic blocking column 24221 sealed in the first channel 24211 and the second channel 24212;

[0524] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte. If the electrolyte cannot be extracted, insert the gas injection tube into the second channel 24212 and inject protective gas into the inner cavity of the housing 1 to extract the electrolyte. After the extraction is completed, remove the electrolyte extraction tube and the gas injection tube, insert the electrolyte injection tube into the first channel 24211, and inject new electrolyte. After the injection is completed, remove the electrolyte injection tube.

[0525] The elastic blocking column 24221 is sealed in the first channel 24211 and the second channel 24212 , and then the cap is sealed and fixed on the liquid injection and replacement component body 2421 .

[0526] Compared with Example 6, in this embodiment, during the process of drawing or injecting liquid, the inner cavity of the shell 1 is inflated or the gas in the inner cavity of the shell 1 is discharged through the second channel 24212, which can better realize the liquid injection and replacement operation.

[0527] Example 8

[0528] Different from the above embodiment, this embodiment further blocks the first channel 24211, or the first channel 24211 and the second channel 24212 on the fluid injection and exchange component body 2421 by hot melting. The following description will be made by taking the blocking of the first channel 24211 and the second channel 24212 on the fluid injection and exchange component body 2421 as an example:

[0529] As shown in FIG18 , in this embodiment, a coaxial multi-stepped hole is provided on the main body 2421 of the injection and replacement component, and the multi-stepped hole is connected to the first channel 24211 and the second channel 24212. In this embodiment, a three-stepped hole is used as an example. When the device is shipped from the factory, as shown in FIG19 , the device may be provided only on the first step surface 210 (the step surface closest to the first channel 24211 and the second channel 24212 is defined as the first step surface 210, the step surface farthest is defined as the third step surface 212, and the step surface in the middle is defined as the second step surface 211). ) is provided with a sealing plate 213, and the first channel 24211 and the second channel 24212 are preliminarily sealed by the sealing plate 213; then, the hot-melt material is poured into the first-level through hole with the sealing plate 213 by hot melting, and after cooling, the first hot-melt part 214 is formed, which performs secondary sealing on the first channel 24211 and the second channel 24212; it should be noted that, in addition to playing the role of preliminarily sealing the first channel 24211 and the second channel 24212, the sealing plate 213 can also prevent the hot-melt material from flowing into the inner cavity of the shell 1. Typically, the hot melt material is a material that does not react with the electrolyte, such as fluororubber, nitrile rubber, natural rubber or EPDM rubber; in addition, when the first channel 24211 and the second channel 24212 are filled with elastic sealing columns 24221, the sealing plate 213 can also prevent the first hot melt component 214 from being connected to the elastic sealing columns 24221 during the hot melt process, thereby preventing the first channel 24211 and the second channel 24212 from being difficult to open later.

[0530] When fluid replacement is needed, follow these steps:

[0531] Remove the cap and use a cutter to open a hole through the first hot melt member 214 and the sealing plate 213 to connect the first channel 24211 and the second channel 24212;

[0532] When there is gas in the inner cavity of the housing 1, the gas will overflow from the second channel 24212, making it easier to inject liquid into the inner cavity of the housing 1. In order to ensure smoother liquid injection, in this step, an exhaust pipe can be inserted into the second channel 24212, and an external exhaust device connected to the exhaust pipe can be started to exhaust gas, so that a certain negative pressure is formed in the inner cavity of the housing 1.

[0533] Afterwards, the electrolyte injection tube is extended into the first channel 24211 and the electrolyte is injected. During the injection process, if there is a problem of injection difficulty, the external exhaust device can be activated to form a certain negative pressure in the inner cavity of the housing 1 before the injection is continued;

[0534] After the rehydration is completed, the electrolyte injection tube and the air extraction tube are pulled out; the elastic sealing column 24221 can be used to preliminarily seal the first channel 24211 and the second channel 24212;

[0535] Then, as shown in FIG20 , the sealing plate 213 is fixed to the second-level stepped surface 211, and then the hot melt material is poured onto the sealing plate 213 and into the second-level through hole (i.e., the stepped hole where the sealing plate is located) for sealing. In this embodiment, in the second sealing process, the second-level stepped surface 211 is used as the fixing surface for the sealing plate 213. This can avoid the problem that when the first-level stepped surface 210 is used as the sealing surface, the sealing plate 213 or the first hot melt member 214 remaining on the first-level stepped surface 210 due to the first opening causes the surface to be uneven, and the sealing plate 213 cannot achieve the sealing effect. Similarly, when performing the third sealing, the sealing plate 213 can be fixed to the third-level stepped surface 212.

[0536] Finally, after the hot melt material cools down, the cap is sealed and fixed on the liquid injection component body 2421.

[0537] When the fluid needs to be changed, follow these steps:

[0538] Remove the cap and use a cutter to open a hole through the first hot melt member 214 and the sealing plate 213 to connect the first channel 24211 and the second channel 24212;

[0539] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte. If the electrolyte cannot be extracted, insert the gas injection tube into the second channel 24212 and inject protective gas into the inner cavity of the housing 1 to extract the electrolyte. After the extraction is completed, remove the electrolyte extraction tube and the gas injection tube, insert the electrolyte injection tube into the first channel 24211, and inject new electrolyte. After the injection is completed, remove the electrolyte injection tube.

[0540] The elastic sealing column 24221 can be used to preliminarily seal the first channel 24211 and the second channel 24212; then, the sealing plate 213 is fixed to the second step surface 211, and then the hot melt material is poured on the sealing plate 213 and the second through hole for sealing; after the hot melt material cools down, the cap is sealed and fixed on the main body 2421 of the injection and replacement component.

[0541] Compared with Example 7, in this embodiment, the liquid injection and replacement component 242 has better sealing performance during the charge and discharge cycle of the large-capacity battery.

[0542] Example 9

[0543] Different from the above embodiment, this embodiment adopts a fluid injection component body 2421 with a different structural form. As shown in Figures 21 and 22, the fluid injection component body 2421 of this embodiment includes an annular fixing part 245 and a rotating part 246; the rotating part 246 is coaxially located in the annular fixing part 245 and is clearance-matched with the annular fixing part 245. Under the action of external force, it can rotate in the annular fixing part 245; two third through holes 217 are opened on the rotating part 246, serving as a first channel 24211 and a second channel 24212. By rotating the rotating part 246, the first channel 24211 is connected to the electrolyte flow channel 2411, and the second channel 24212 is connected to the gas flow channel 2414.

[0544] In order to prevent the electrolyte from flowing out from the gap between the annular fixing member 245 and the rotating member 246, in this embodiment, a sealing ring 215 can be added to the matching part of the two to achieve sealing, as shown in Figure 22.

[0545] In addition, in order to rotate the rotating part 246 into place at one time during operation, this embodiment can also set an identifier on the annular fixing part 245. For example, an identifier can be set at the position where the first channel 24211 is connected to the electrolyte circulation channel 2411. When the port of the first channel 24211 is flush with the identifier, it is considered that the first channel 24211 is connected to the electrolyte circulation channel 2411, and the second channel 24212 is connected to the gas circulation channel 2414.

[0546] As shown in Figure 21, in order to position the rotating part 246, a positioning block 216 can also be set on the annular fixing part 245, and threaded holes are opened on the positioning block 216 and the rotating part 246. When positioning is required, screws are used to achieve the positioning of the rotating part 246 in the annular fixing part 245.

[0547] When fluid replacement is needed, follow these steps:

[0548] Remove the cap and rotate the rotating member 246 so that the first channel 24211 is connected to the electrolyte flow channel 2411 and the second channel 24212 is connected to the gas flow channel 2414;

[0549] When there is gas in the inner cavity of the housing 1, the gas will overflow from the second channel 24212, making it easier to inject liquid into the inner cavity of the housing 1. In order to ensure smoother liquid injection, in this step, an exhaust pipe can be inserted into the second channel 24212, and an external exhaust device connected to the exhaust pipe can be started to exhaust gas, so that a certain negative pressure is formed in the inner cavity of the housing 1.

[0550] Afterwards, the electrolyte injection tube is extended into the first channel 24211 and the electrolyte is injected. During the injection process, if there is a problem of injection difficulty, the external exhaust device can be activated to form a certain negative pressure in the inner cavity of the housing 1 before the injection is continued;

[0551] After the fluid replenishment is completed, the electrolyte injection tube and the air extraction tube are pulled out, and the elastic sealing column 24221 can be used to preliminarily seal the first channel 24211 and the second channel 24212; the rotating part 246 is rotated to isolate the first channel 24211 from the electrolyte flow channel 2411, and the second channel 24212 from the gas flow channel 2414; the side wall of the rotating part 246 is used to seal the electrolyte flow channel 2411 and the gas flow channel 2414 again; then, the cap is sealed and fixed on the main body 2421 of the fluid injection and replacement component.

[0552] When the fluid needs to be changed, follow these steps:

[0553] Remove the cap and rotate the rotating member 246 so that the first channel 24211 is connected to the electrolyte flow channel 2411 and the second channel 24212 is connected to the gas flow channel 2414;

[0554] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte. If the electrolyte cannot be extracted, insert the gas injection tube into the second channel 24212 and inject protective gas into the inner cavity of the housing 1 to extract the electrolyte. After the extraction is completed, remove the electrolyte extraction tube and the gas injection tube, insert the electrolyte injection tube into the first channel 24211, and inject new electrolyte. After the injection is completed, remove the electrolyte injection tube.

[0555] The elastic sealing column 24221 can be used to preliminarily seal the first channel 24211 and the second channel 24212; then, the rotating part 246 is rotated to isolate the first channel 24211 from the electrolyte flow channel 2411, and the second channel 24212 from the gas flow channel 2414, and the side wall of the rotating part 246 is used to seal the electrolyte flow channel 2411 and the gas flow channel 2414 again; then, the cap is sealed and fixed on the liquid injection and replacement component body 2421.

[0556] Compared with Example 8, the sealing method of this embodiment is simpler. During the charge and discharge cycle of the large-capacity battery, the liquid injection and replacement component 242 also has good sealing performance.

[0557] Example 10

[0558] Different from Example 9, this embodiment only has one fourth through hole 222 on the rotating member 246. As shown in Figures 23 and 24, by rotating the rotating member 246, the fourth through hole 222 is connected to the electrolyte flow channel 2411 and the gas flow channel 2414 respectively.

[0559] In order to rotate the rotating member 246 to the correct position at one time during operation, in this embodiment, identifiers can be set on both the rotating member 246 and the annular fixed member 245, a third identifier 220 is set on the rotating member, and a first identifier 218 and a second identifier 219 are respectively set on the annular fixed member 245 at positions corresponding to the electrolyte circulation channel 2411 and the gas circulation channel 2414; when the third identifier 220 on the rotating member 246 points to the first identifier 218 on the annular fixed member 245, it is considered that the fourth through hole 222 is connected to the electrolyte circulation channel 2411, and when the third identifier 220 on the rotating member 246 points to the second identifier 219 on the annular fixed member 245, it is considered that the fourth through hole 222 is connected to the gas circulation channel 2414.

[0560] When fluid replacement is needed, follow these steps:

[0561] Remove the cap and rotate the rotating member 246 to connect the fourth through hole 222 with the electrolyte flow channel 2411;

[0562] When the pressure in the inner cavity of the housing 1 is too high, the rotating member 246 may be rotated first to connect the fourth through hole 222 with the gas flow channel 2414; gas will overflow from the fourth through hole 222, making it easier to inject liquid into the inner cavity of the housing 1. To ensure smoother liquid injection, in this step, an exhaust pipe may be inserted into the fourth through hole 222, and an external exhaust device connected to the exhaust pipe may be started to exhaust gas, so that a certain negative pressure is formed in the inner cavity of the housing 1; in order to prevent external air from entering the inner cavity of the housing 1 through the fourth through hole 222, this step is preferably performed in a vacuum environment;

[0563] Afterwards, the rotating member 246 is rotated to connect the fourth through hole 222 with the electrolyte flow channel 2411. The electrolyte injection tube is inserted into the fourth through hole 222 in a vacuum environment and the electrolyte is injected. If injection becomes difficult during the injection process, the rotating member 246 can be rotated again to connect the fourth through hole 222 with the gas flow channel 2414. After exhausting or pumping out the gas, the injection can be continued.

[0564] After the fluid replenishment is completed, the electrolyte injection tube is pulled out, and the elastic sealing column 24221 can be used to preliminarily seal the fourth through hole 222; the rotating part 246 is rotated to isolate the fourth through hole 222 from the electrolyte flow channel 2411 and the gas flow channel 2414; the electrolyte flow channel 2411 and the gas flow channel 2414 are sealed again using the side wall of the rotating part 246; thereafter, the cap is sealed and fixed on the main body 2421 of the fluid injection component.

[0565] When the fluid needs to be changed, follow these steps:

[0566] Remove the cap and rotate the rotating member 246 to connect the fourth through hole 222 with the electrolyte flow channel 2411;

[0567] Insert the electrolyte extraction tube into the fourth through hole 222 and extract the electrolyte; if the electrolyte cannot be extracted, rotate the rotating member 246 to connect the fourth through hole 222 with the gas flow channel 2414; insert the gas injection tube into the fourth through hole 222 to inject protective gas into the inner cavity of the housing 1; rotate the rotating member 246 again to connect the fourth through hole 222 with the electrolyte flow channel 2411 to extract the electrolyte; after the extraction is completed, remove the electrolyte extraction tube, extend the electrolyte injection tube into the fourth through hole 222, and inject new electrolyte; after the injection is completed, remove the electrolyte injection tube;

[0568] The fourth through hole 222 can be initially sealed using the elastic sealing column 24221; then, the rotating part 246 is rotated to isolate the fourth through hole 222 from the electrolyte flow channel 2411 and the gas flow channel 2414; the electrolyte flow channel 2411 and the gas flow channel 2414 are sealed again using the side wall of the rotating part 246; then, the cap is sealed and fixed on the liquid injection component body 2421.

[0569] Compared with Example 9, the structure of the rotating member 246 of this embodiment is simpler, and during the charge and discharge cycle of the large-capacity battery, the liquid injection component 242 also has better sealing performance.

[0570] Examples 11 to 15 provide a large-capacity battery assembly, comprising a large-capacity battery and a repair mechanism. The large-capacity battery comprises a housing and m parallel-connected single cells arranged within the housing, where m>1. The single cells may be prismatic batteries or multiple commercially available parallel-connected soft-pack batteries. The interior of each single cell includes an electrolyte region and a gas region.

[0571] For the convenience of description, the length direction of the shell is defined as the x direction, the width direction of the shell is defined as the y direction, and the height direction of the shell is defined as the z direction.

[0572] The outer shell is provided with an electrolyte sharing chamber; the electrolyte sharing chamber is connected to the electrolyte area in the inner cavity of each single cell; the repair mechanism is a liquid injection and replacement component, which is used to replenish electrolyte into the electrolyte sharing chamber and the inner cavity of each single cell, or to replace the electrolyte in the electrolyte sharing chamber and the inner cavity of each single cell.

[0573] The housing can have at least the following two structures:

[0574] The first structure includes a first cylinder with open ends at both ends (i.e., the end portions parallel to the yz plane are open ends) and end plate assemblies respectively fixed to the two open ends of the first cylinder (i.e., the end plate assemblies are parallel to the yz plane);

[0575] The second structure includes a second cylindrical body with open ends at the top and bottom (i.e., the ends parallel to the xy plane are open ends), and a housing top plate and housing bottom plate respectively fixed to the top and bottom open ends of the second cylindrical body (i.e., both the housing top plate and the housing bottom plate are parallel to the xy plane). In this structure, the side wall of the second cylindrical body parallel to the yz plane is referred to as the first side wall. The housing bottom plate and the second cylindrical body may be integral or separate components.

[0576] The following embodiments 11 to 15 are mainly introduced by taking the second structure as an example.

[0577] The electrolyte sharing chamber is located on the bottom plate of the housing.

[0578] It should be noted here that the above-mentioned electrolyte shared chamber is an electrolyte containing chamber. After it is connected with the electrolyte area of ​​the inner cavity of each single battery, it is necessary to ensure that the electrolyte in the entire large-capacity battery does not come into contact with the external environment.

[0579] A gas chamber may also be provided on the top plate of the housing, which covers the gas port on the top of each single cell in the large-capacity battery. It should be noted that the gas port here includes the following two meanings:

[0580] 1) The gas port is a through hole directly opened on the top plate of the single cell shell and penetrating the inner cavity of the single cell;

[0581] At this time, the inner cavity of the gas chamber is connected with the gas area of ​​the inner cavity of each single cell through the gas port. The gas chamber serves as a gas sharing chamber for each single cell. Based on the gas chamber, the gas areas of each single cell can be connected to achieve gas balance, so that the gas of each single cell is shared to ensure the consistency of each single cell, which improves the cycle life of the large-capacity battery to a certain extent; when any single cell has thermal runaway, the smoke in the inner cavity of the single cell enters the gas chamber and is discharged through the gas chamber, thereby improving the safety of the large-capacity battery.

[0582] 2) The gas port is an explosion vent or explosion-proof port provided on the top plate of the single cell housing, and an explosion vent membrane is provided at the explosion vent or explosion-proof port;

[0583] At this time, the gas chamber is used as the first explosion-proof channel. When the explosion-proof membrane at the gas outlet of any single battery is broken by the internal smoke, the smoke in the internal cavity of the single battery is discharged through the gas chamber, thereby improving the safety of the large-capacity battery.

[0584] In order to improve the heat dissipation performance of such large-capacity batteries, avoidance holes are opened on the top plate of the shell to allow the polarity terminals of each single battery to extend out; the polarity terminals of each single battery extend out of the avoidance holes and the top plate area of ​​the shell around the avoidance holes is fixedly sealed with the single battery shell.

[0585] It should be noted that the single cell polarity terminal described here can be a single cell pole. In order to prevent the single cell pole from being unable to smoothly extend out of the avoidance hole as a polarity terminal, a pole adapter can also be connected to the single cell pole, and the overall structure of the single cell pole and the pole adapter can be used as the single cell polarity terminal.

[0586] The liquid injection component can be fixed at any position of the shell, for example, it can be set on the first side wall (any first side wall or both first side walls). After the large-capacity battery is charged and discharged for a period of time, the electrolyte is decomposed and consumed and reduced, resulting in a decrease in the performance of the large-capacity battery. The liquid injection component can be used to replenish the electrolyte shared chamber and the inner cavity of each single cell to improve the performance of the large-capacity battery; or, after the large-capacity battery is charged and discharged for a period of time, the electrolyte appears in the electrolyte and affects the performance of the large-capacity battery. The electrolyte in the electrolyte shared chamber and the inner cavity of each single cell can also be replaced by the liquid injection component to improve the performance of the large-capacity battery. The replacement here can be a partial replacement or a complete replacement. In addition, after the electrolyte area of ​​each single cell cavity and the electrolyte shared chamber are connected, the electrolyte can be re-injected into the inner cavity of each single cell and the electrolyte shared chamber through the liquid injection component to ensure the continuity of the electrolyte.

[0587] The following describes Examples 11 to 15 in detail with reference to the accompanying drawings.

[0588] Example 11

[0589] As shown in Figures 25 and 26, this embodiment of a large-capacity battery assembly includes a housing and ten parallel-connected cells 2 within the housing. These cells 2 are prismatic. The number of cells in other embodiments can be adjusted based on actual needs. Each cell 2 has a through-hole at the bottom of its housing that extends through its inner cavity.

[0590] The housing includes a second cylinder 331 and a housing top plate 12 and a housing bottom plate 11 covering the open end of the second cylinder 331. The housing top plate 12 and the housing bottom plate 11 are parallel to the xy plane.

[0591] An electrolyte sharing chamber 4 extending along the x-direction is provided on the bottom plate 11 of the housing; the electrolyte sharing chamber 4 is connected to the electrolyte area of ​​the inner cavity of each single battery 2 through the through hole of the single battery 2.

[0592] The housing top plate 12 is provided with a clearance hole to allow the polarity terminals of each battery cell 2 to extend. Each battery cell 2 polarity terminal extends through the clearance hole, and the area of ​​the housing top plate 12 surrounding the clearance hole is securely sealed to the battery cell 2 housing. As can be seen from the figure, in this embodiment, the polarity terminals of the battery cell 2 refer to the integrated structure of the battery cell post 21 and the post adapter 6.

[0593] 27 and 28 , in this embodiment, an electrolyte circulation channel 2411 is provided on one of the first side walls 311 and a liquid injection and exchange component 242 is provided on the first side wall 311; it can be seen from the figure that part of the structure of the liquid injection and exchange component 242 is located on the outer surface 3112 of the first side wall, wherein the outer surface 3112 of the first side wall refers to the surface of the first side wall 311 away from each single battery 2 in the second cylinder 331.

[0594] As can be seen from Figure 28, in this embodiment, the electrolyte circulation channel 2411 is defined along the z-direction on the first sidewall 311. The injection member 242 includes an injection member body 2421 and a sealing member fixed to the injection member body 2421. In this embodiment, the injection member body 2421 is a cylinder; in other embodiments, rectangular columns, semi-cylinders, etc., may also be used. A first channel 24211 is defined in the injection member body 2421 and communicates with the electrolyte circulation channel 2411.

[0595] 29 , in order to fix the fluid injection / exchange component 242 on the first side wall 311, a first blind hole 3113 is opened on the first side wall 311 along the x-direction (the opening end of the first blind hole 3113 is located on the outer surface 3112 of the first side wall), the fluid injection / exchange component body 2421 is fixed in the first blind hole 3113 (it can be fixed by welding), and the first blind hole 3113 is sealed, and the first blind hole 3113 and the electrolyte circulation channel 2411 are connected.

[0596] In order to reduce the material consumption and lower the material cost of the second cylinder, a cavity 37 is opened on the first side wall to be isolated from the electrolyte flow channel. After the cavity 37 is opened, the weight of the entire large-capacity battery can be reduced at the same time.

[0597] The blocking member in this embodiment is a cap 362 (which can be a nut) that is fastened to the main body 2421 of the fluid injection and replacement component and is threadedly connected to the main body 2421 of the fluid injection and replacement component. A sealing ring can be provided at the threaded connection part to improve the sealing of this part and block the first channel 24211.

[0598] In some other embodiments, the cap 362 may also be connected to the fluid injection and replacement component body 2421 in an interference fit manner, but compared with this embodiment, disassembly is more difficult.

[0599] In some other embodiments, the sealing member may further include an elastic sealing column filled in the first channel 24211 to further ensure the sealing of the first channel 24211. The elastic sealing column may be made of a rubber material that does not react with the electrolyte, such as fluororubber, nitrile rubber, natural rubber, or EPDM rubber.

[0600] After the large-capacity battery is assembled, both ends of the electrolyte circulation channel 2411 are connected to the electrolyte shared chamber 4 and the first channel 24211 of the liquid injection and replacement component 242 respectively.

[0601] When fluid replacement is needed, follow these steps:

[0602] Remove the cap 362;

[0603] Insert the electrolyte injection tube into the first channel 24211 and inject the electrolyte. After the electrolyte injection is completed, remove the electrolyte injection tube.

[0604] The cap 362 is sealed and fixed on the liquid injection and replacement component body 2421 to block the first channel 24211.

[0605] When the fluid needs to be changed, follow these steps:

[0606] Remove the cap 362;

[0607] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte; then, insert the electrolyte injection tube into the first channel 24211 and inject new electrolyte; after the injection is completed, remove the electrolyte injection tube;

[0608] The cap 362 is sealed and fixed on the liquid injection and replacement component body 2421 to block the first channel 24211.

[0609] It should be noted that, in this embodiment, during the liquid injection process, if the pressure in the inner cavity of the shell is too high, the problem of liquid injection difficulty may occur.

[0610] Example 12

[0611] Different from the embodiment 11, as shown in FIG. 30 to FIG. 32 , the large-capacity battery of this embodiment has a gas chamber 9 provided on the top plate 12 of the outer shell; the gas chamber 9 is connected to the gas area of ​​the inner cavity of each single battery 2 .

[0612] Correspondingly, a gas circulation channel 2414 communicating with the gas chamber 9 is further provided on the first side wall 311 ; a second channel 24212 is provided on the liquid injection component body 2421 , and the blocking member is also used to block the second channel 24212 .

[0613] As shown in Figure 32, the gas flow channel 2414 of this embodiment is provided on the first sidewall 311 along the z-direction and is isolated from the electrolyte flow channel 2411. The ends of the gas flow channel 2414 respectively communicate with the gas chamber 9 and the second channel 24212. The second channel 24212 is an L-shaped channel provided on the main body 2421 of the injection and replacement member, comprising a horizontal channel and a vertical channel. For ease of processing, the longitudinal cross-section of the horizontal channel of this embodiment is circular.

[0614] In addition to the cap 362 fastened on the fluid injection and replacement component body 2421, the sealing member in this embodiment also includes an elastic sealing column sealed in the first channel 24211 and the second channel 24212, ensuring that the fluid injection and replacement component 242 has better sealing performance during normal charge and discharge cycles.

[0615] After the large-capacity battery is assembled, the two ends of the electrolyte circulation channel 2411 are respectively connected to the electrolyte shared chamber 4 and the first channel 24211 of the liquid injection component 242, and the two ends of the gas circulation channel 2414 are respectively connected to the gas chamber 9 and the second channel 24212 of the liquid injection component 242.

[0616] When fluid replacement is needed, follow these steps:

[0617] Remove the cap 362 and take out the elastic blocking column sealed in the first channel 24211 and the second channel 24212;

[0618] When there is gas in the inner cavity of the housing, the gas will overflow from the second channel 24212, making it easier to inject liquid into the inner cavity of the housing. To ensure smoother liquid injection, in this step, an air extraction tube can be inserted into the second channel 24212, and an external air extraction device connected to the air extraction tube can be activated to extract air, thereby forming a certain negative pressure in the inner cavity of the housing.

[0619] Afterwards, the electrolyte injection tube is inserted into the first channel 24211 and the electrolyte is injected. If injection becomes difficult during the injection process, the external air extraction device can be activated to create a certain negative pressure in the inner cavity of the housing before the injection can be continued.

[0620] After the fluid replenishment is completed, the electrolyte injection tube and the air extraction tube are pulled out; the elastic blocking column is sealed in the first channel 24211 and the second channel 24212, and then the cap 362 is sealed and fixed on the fluid injection and replacement component body 2421.

[0621] When the fluid needs to be changed, follow these steps:

[0622] Remove the cap 362 and take out the elastic blocking column sealed in the first channel 24211 and the second channel 24212;

[0623] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte. If the electrolyte cannot be extracted, insert the gas injection tube into the second channel 24212 and inject protective gas into the inner cavity of the shell to extract the electrolyte. After the extraction is completed, remove the electrolyte extraction tube and the gas injection tube, insert the electrolyte injection tube into the first channel 24211, and inject new electrolyte. After the injection is completed, remove the electrolyte injection tube.

[0624] The elastic blocking column is sealed in the first channel 24211 and the second channel 24212 , and then the cap 362 is sealed and fixed on the liquid injection and replacement component body 2421 .

[0625] Compared with Example 11, in this embodiment, during the process of drawing or injecting liquid, the inner cavity of the shell is inflated or the gas in the inner cavity of the shell is discharged through the second channel 24212, which can better realize the liquid injection and replacement operation.

[0626] Example 13

[0627] Unlike Example 12, as shown in Figures 33 and 34 , the second channel 24212 of this embodiment is an L-shaped channel, comprising a horizontal channel and a vertical channel, wherein the longitudinal cross-section of the horizontal channel is a sector-shaped ring. This sector-shaped ring is concentric with the first channel 24211. Compared to Example 12, while maintaining the same flow area for the vertical channel, the radial dimension requirement for the fluid injection / exchange component body 2421 is smaller. This allows the fluid injection / exchange component body 2421, with its limited volume, to provide an inlet or outlet channel with the largest flow area, further reducing the difficulty of withdrawing or injecting fluid.

[0628] Example 14

[0629] Different from Example 12, as shown in Figures 35 and 36, the second channel 24212 of this embodiment includes a horizontal channel and a vertical channel that are interconnected, wherein the horizontal channel is a plurality of through holes connected to the vertical channel, and the plurality of through holes are arranged along the same circumference.

[0630] Similar to the fan ring, under the condition that the vertical channels of this embodiment have the same flow area, the radial dimension requirements for the liquid injection and exchange component body 2421 are relatively small. The air inlet or outlet channel with the largest flow area can be opened on the liquid injection and exchange component body 2421 with a limited volume, further reducing the difficulty of pumping or injecting liquid.

[0631] Example 15

[0632] Different from the above embodiment, this embodiment further blocks the first channel 24211, or the first channel 24211 and the second channel 24212 on the fluid injection and exchange component body 2421 by hot melting. The following description will be made by taking the blocking of the first channel 24211 and the second channel 24212 on the fluid injection and exchange component body 2421 as an example:

[0633] As shown in Figures 37 and 38 , in this embodiment, a hollow member 363 extending along the x-direction is provided at the upper end of the main body 2421 of the fluid injection / exchange member. The inner cavity of this hollow member 363 is interconnected with the first channel 24211 and the second channel 24212. Typically, the hollow member 363 is made of the same aluminum material as the outer shell. To seal the first channel 24211 and the second channel 24212 by hot-melting, in this embodiment, a first rubber ring 364 is fixed within the hollow member 363 by adhesive sealing. The first channel 24211 and the second channel 24212 are sealed by hot-melting within the first rubber ring 364. After the hot-melt material cools, a second hot-melt member 365 is formed within the first rubber ring 364. The first and second hot-melt members 364 and 365 are typically made of a rubber material that does not react with the electrolyte, such as fluororubber, nitrile rubber, natural rubber, or EPDM rubber.

[0634] When fluid replacement is needed, follow these steps:

[0635] Remove the cap 362 and use a cutter to open a hole in the second hot melt member 365 that passes through the first channel 24211 and the second channel 24212 ;

[0636] When there is gas in the inner cavity of the housing, the gas will overflow from the second channel 24212, making it easier to inject liquid into the inner cavity of the housing. To ensure smoother liquid injection, in this step, an exhaust pipe can be inserted into the second channel 24212, and an external exhaust device connected to the exhaust pipe can be started to exhaust gas, so that a certain negative pressure is formed in the inner cavity of the housing.

[0637] Afterwards, the electrolyte injection tube is inserted into the first channel 24211 and the electrolyte is injected. If injection becomes difficult during the injection process, the external air extraction device can be activated to create a certain negative pressure in the inner cavity of the housing before the injection can be continued.

[0638] After the rehydration is completed, the electrolyte injection tube and the air extraction tube are pulled out; the first channel 24211 and the second channel 24212 can be preliminarily sealed using an elastic sealing column;

[0639] Afterwards, the opening is sealed by hot melting;

[0640] Finally, after the hot melt material cools down, the cap 362 is sealed and fixed on the liquid injection component body 2421.

[0641] When the fluid needs to be changed, follow these steps:

[0642] Remove the cap 362 and use a cutter to open a hole in the second hot melt member 365 that passes through the first channel 24211 and the second channel 24212 ;

[0643] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte. If the electrolyte cannot be extracted, insert the gas injection tube into the second channel 24212 and inject protective gas into the inner cavity of the shell to extract the electrolyte. After the extraction is completed, remove the electrolyte extraction tube and the gas injection tube, insert the electrolyte injection tube into the first channel 24211, and inject new electrolyte. After the injection is completed, remove the electrolyte injection tube.

[0644] The first channel 24211 and the second channel 24212 can be initially sealed using an elastic sealing column; then, a hot melt material is poured into the opening to seal it; after the hot melt material cools, the cap 362 is sealed and fixed to the main body 2421 of the fluid injection component.

[0645] In this embodiment, during the charge and discharge cycle of the large-capacity battery, the liquid injection and replacement component 242 has better sealing performance.

[0646] Examples 16 to 22 provide a fluid injection component and a lithium-ion battery (including a large-capacity battery) having the fluid injection component. The fluid injection component is mainly composed of a fluid injection component body, an electrolyte circulation pipe section and a sealing member. The fluid injection component body is fixed on the lithium-ion battery shell, and a first channel that is connected to the inner cavity of the shell is opened on the fluid injection component body; the electrolyte circulation pipe section is located in the shell, one end of which is fixed on the fluid injection component body and is connected to the first channel; the other end of the electrolyte circulation pipe section is connected to the electrolyte area of ​​the inner cavity of the shell; the sealing member is used to block the first channel from the outside of the shell.

[0647] After a period of charge and discharge cycles of a lithium-ion battery, the performance is reduced due to the decomposition and consumption of the electrolyte. The sealing member can be opened and the electrolyte can be added to the inner cavity of the shell through the first channel on the main body of the liquid injection component to improve the performance of the lithium-ion battery. Alternatively, after a period of charge and discharge cycles of a lithium-ion battery, the performance of the lithium-ion battery is affected by the appearance of impurities in the electrolyte. The electrolyte in the inner cavity of the shell can also be replaced by the liquid injection component to improve the performance of the lithium-ion battery. The replacement here can be a partial replacement or a complete replacement. After completing the liquid replenishment or liquid replacement operation, the first channel can be blocked from the outside of the shell using the sealing member. The operation is simple and convenient.

[0648] It should be noted that the lithium-ion battery mentioned above may be a lithium-ion single cell, or a lithium-ion battery module with a housing (ie, a large-capacity battery).

[0649] If it is a lithium-ion single cell battery, a fixing portion can be set at any position of the lithium-ion single cell battery shell to fix the liquid injection and replacement component on the lithium-ion single cell battery shell. Preferably, the liquid injection and replacement component is fixed on the liquid injection port of the lithium-ion single cell battery to achieve the function of replenishing or replacing the electrolyte.

[0650] If it is a lithium-ion battery module (also known as a lithium-ion battery pack or a large-capacity battery), the liquid injection and replacement component can also be fixed to any part of the lithium-ion battery module shell. Based on the liquid injection and replacement component, the electrolyte in the inner cavity of the shell can be replenished or replaced.

[0651] The following further describes Examples 16 to 22 with reference to the accompanying drawings.

[0652] Example 16

[0653] 39 is a schematic structural diagram of the liquid injection and replacement component 242 of this embodiment. The liquid injection and replacement component 242 of this embodiment includes a liquid injection and replacement component body 2421, an electrolyte flow pipe section 52, and a blocking member 2422 provided on the liquid injection and replacement component body 2421.

[0654] The fluid injection component body 2421 is used to be fixed to the lithium-ion battery housing 1. As shown in Figure 40, in this embodiment, the fluid injection component body 2421 is a cylinder. In other embodiments, rectangular columns, semi-cylinders, etc. can also be used. To facilitate its fixation to the lithium-ion battery housing 1, this embodiment provides an annular limiting boss 511 along the outer circumference of the fluid injection component body 2421. A mounting hole is provided in the lithium-ion battery housing 1, and the fluid injection component body 2421 is fixed in the mounting hole. The annular limiting boss 511 is welded to the area of ​​the housing 1 surrounding the mounting hole to achieve both fixation and sealing the mounting hole.

[0655] A through hole is formed in the main body 2421 of the fluid injection / exchange member, serving as a first channel 24211. The first channel 24211 can be a straight through hole or an L-shaped through hole. After the main body 2421 of the fluid injection / exchange member is fixed to the lithium-ion battery housing 1, one end of the first channel 24211 is located outside the housing 1, and the other end is located inside the housing 1, for connection to the electrolyte circulation pipe section 52.

[0656] One end of the electrolyte circulation pipe section 52 is fixed on the liquid injection and replacement component body 2421 and communicates with the first channel 24211 ; the other end is used to communicate with the electrolyte area in the inner cavity of the shell 1 .

[0657] It should be noted that the end of the electrolyte circulation pipe section connected to the electrolyte area in the inner cavity of the shell can be directly extended into the bottom of the inner cavity of the shell and is always immersed in the electrolyte. When the liquid needs to be changed, as much electrolyte as possible in the inner cavity of the shell can be extracted, making the liquid change more thorough.

[0658] The electrolyte flow pipe section 52 and the liquid injection and replacement component body 2421 can be an integral piece or a separate piece. When a separate piece is used, it can be connected to the liquid injection and replacement component body 2421 by welding or screwing. The electrolyte flow pipe section 52 is generally made of the same aluminum material as the liquid injection and replacement component body 2421.

[0659] The blocking member 2422 of this embodiment, as shown in FIG. 41 and FIG. 42 , includes a first rubber ring 364 and a second hot melt member 365 , which blocks the first channel 24211 from the outside of the housing 1 by hot melting.

[0660] As can be seen in FIG. 41 , in this embodiment, a counterbore 513 is defined axially along the main body 2421 of the fluid injection / exchange member, extending through the first channel 24211. Typically, the main body 2421 of the fluid injection / exchange member is made of the same aluminum material as the lithium-ion battery housing 1. To seal the first channel 24211 by heat-melting, in this embodiment, a first rubber ring 364 is secured within the counterbore 513 by adhesive sealing. This seals the first channel 24211 by heat-melting within the first rubber ring 364. After the heat-melt material cools, a second heat-melt member 365 forms within the first rubber ring 364. The first and second heat-melt members 364 and 365 are typically made of a rubber material that does not react with the electrolyte, such as fluororubber, nitrile rubber, natural rubber, or EPDM.

[0661] Example 17

[0662] Different from Example 16, as shown in Figure 43, the sealing member 2422 in this embodiment also includes a cap 362 (which can be a nut) that is fastened on the main body 2421 of the fluid injection and exchange component and is threadedly connected to the main body 2421 of the fluid injection and exchange component. A sealing ring can be provided at the threaded connection part to improve the sealing of this part.

[0663] This embodiment uses two seals to block the first channel 24211, which has a good sealing effect.

[0664] In some other embodiments, the cap 362 may also be connected to the fluid injection and replacement component body 2421 in an interference fit manner, but compared with this embodiment, disassembly is more difficult.

[0665] In some other embodiments, the cap 362 can also serve as a sealing member 2422 to seal the first channel 24211 alone, but the sealing reliability is poor compared to this embodiment and embodiment 16.

[0666] Example 18

[0667] In this embodiment, based on the above embodiment, a second channel 24212 is provided on the fluid injection component body 2421 , and the blocking member 2422 in the above embodiment is also used to block the second channel 24212 , as specifically shown in FIG. 44 and FIG. 45 .

[0668] In this embodiment, another through-hole is provided in the main body 2421 of the fluid injection / exchange member along its axial direction, serving as a second channel 24212. See FIG44 . For ease of processing, the second channel 24212 in this embodiment is a circular straight through-hole. In other embodiments, the second channel 24212 may also be an L-shaped through-hole, the cross-section of which may be adjusted based on actual needs. As long as the second channel 24212 is connected to the gas zone within the inner cavity of the housing 1, the protective gas can be injected into the inner cavity of the housing 1 or the gas within the inner cavity of the housing 1 can be exhausted through the second channel 24212.

[0669] Example 19

[0670] Unlike Example 18, as shown in FIG46 , the cross-section of the second channel 24212 in this embodiment is a sector ring. This sector ring is concentric with the first channel 24211. Compared with Example 18, while the second channel 24212 has the same flow area, the radial dimension requirement for the fluid injection and exchange component body 2421 is smaller. This allows the fluid injection and exchange component body 2421, which has a limited volume, to be provided with an inlet or outlet channel with the largest flow area, further reducing the difficulty of withdrawing or injecting fluid.

[0671] Example 20

[0672] Different from the embodiment 18, as shown in FIG47 , the second channel 24212 of this embodiment is composed of a plurality of through holes opened along the axial direction of the fluid injection and replacement component body 2421 , and the plurality of through holes are arranged along the same circumference.

[0673] Similar to the fan ring, under the condition that the second channel 24212 of this embodiment has the same flow area, the radial dimension requirement for the liquid injection and exchange component body 2421 is relatively small, and an air inlet or outlet channel with the largest flow area can be opened on the liquid injection and exchange component body 2421 with a limited volume, further reducing the difficulty of extracting or injecting liquid.

[0674] Example 21

[0675] As shown in Figure 48, this embodiment is a lithium-ion battery, specifically a large-capacity battery, comprising a housing 1, a fluid injection / exchange member 242 fixed to the housing 1, and m parallel-connected single cells 2 arranged within the housing 1, where m>1. The single cells 2 described herein can be prismatic batteries or multiple commercially available parallel-connected soft-pack batteries. The interior of each single cell 2 includes an electrolyte region and a gas region.

[0676] The housing 1 is provided with an electrolyte sharing chamber 4; the electrolyte sharing chamber 4 is in communication with the electrolyte area in the inner cavity of each single battery 2;

[0677] It should be noted that the electrolyte shared chamber 4 is an electrolyte containing chamber, which is connected to the electrolyte area of ​​each single battery 2 to ensure that the electrolyte in the entire large-capacity battery does not come into contact with the external environment.

[0678] In order to improve the heat dissipation performance of such large-capacity batteries, an avoidance hole can be opened on the shell 1 to allow the polarity terminals of each single battery 2 to extend out; the polarity terminals of each single battery 2 extend out of the avoidance hole and the cylindrical top plate area around the avoidance hole is fixedly sealed with the shell of the single battery 2.

[0679] It should be noted that the polarity terminal of the single cell battery 2 described here can be the pole of the single cell battery 2. If it is to be avoided that the pole of the single cell battery 2 cannot be smoothly extended out of the avoidance hole as a polarity terminal, a pole adapter can also be connected to the pole of the single cell battery 2, and the overall structure of the pole of the single cell battery 2 and the pole adapter can be used as the polarity terminal of the single cell battery 2.

[0680] The liquid injection and replacement component 242 is fixed on the housing 1 , and the other end of the electrolyte circulation pipe section 52 is communicated with the electrolyte sharing chamber 4 .

[0681] For the convenience of description, the length direction of the housing 1 is defined as the x direction, the width direction is defined as the y direction, and the height direction is defined as the z direction.

[0682] This embodiment adopts the liquid injection component 242 of Example 16 or Example 17. The liquid injection component 242 can be fixed at any position of the housing 1. For example, in this embodiment, the liquid injection component 242 is arranged on the first side wall 311 (the side wall parallel to the yz plane) of the housing 1. After the large-capacity battery is charged and discharged for a period of time, the electrolyte decomposes and consumes and reduces, resulting in a decrease in the performance of the large-capacity battery. The liquid injection component 242 can be used to replenish electrolyte into the electrolyte shared chamber 4 and the inner cavity of each single cell 2 to improve the performance of the large-capacity battery. Alternatively, after the large-capacity battery is charged and discharged for a period of time, the electrolyte appears in the electrolyte, affecting the performance of the large-capacity battery. The liquid injection component 242 can also be used to replace the electrolyte in the electrolyte shared chamber 4 and the inner cavity of each single cell 2 to improve the performance of the large-capacity battery. The replacement here can be a partial replacement or a complete replacement. In addition, after the electrolyte areas in the inner cavities of the individual cells 2 are connected to the electrolyte shared chamber 4 , electrolyte can be re-injected into the inner cavities of the individual cells 2 and the electrolyte shared chamber 4 through the liquid injection component 242 to ensure the continuity of the electrolyte.

[0683] 49 and 50 , in this embodiment, a mounting hole 5421 is provided on the first side wall 311 of the housing 1, which is adapted to the cross-sectional shape of the fluid replacement body. The fluid replacement member body 2421 is coaxially located within the mounting hole 5421, and the annular limiting boss 511 is seal-welded to the area surrounding the mounting hole 5421. When such large-capacity batteries are assembled into an energy storage device, multiple large-capacity batteries are arranged along the width of the large-capacity batteries, such that the first side walls 311 of each large-capacity battery are exposed. When the fluid replacement member 242 is positioned on the first side wall 311, fluid replacement operations can be facilitated.

[0684] The following describes the process of replenishing and replacing fluid by taking the blocking member 2422 as the first rubber ring 364, the second hot melt member 365 and the cap 362 as an example:

[0685] When fluid replacement is needed, follow these steps:

[0686] Remove the cap 362 and use a cutter to create an opening on the second hot melt member 365 that passes through the first channel 24211 ;

[0687] Insert the electrolyte injection tube into the first channel 24211 and inject the electrolyte. After the electrolyte injection is completed, remove the electrolyte injection tube.

[0688] The hot melt material is poured into the opening to seal it; after the hot melt material cools down, the cap 362 is sealed and fixed on the liquid injection component body 2421.

[0689] When the fluid needs to be changed, follow these steps:

[0690] Remove the cap 362 and use a cutter to create an opening on the second hot melt member 365 that passes through the first channel 24211 ;

[0691] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte; then, insert the electrolyte injection tube into the first channel 24211 and inject new electrolyte; after the injection is completed, remove the electrolyte injection tube;

[0692] The hot melt material is poured into the opening to seal it; after the hot melt material cools down, the cap 362 is sealed and fixed on the liquid injection component body 2421.

[0693] It should be noted that, in this embodiment, during the liquid injection process, if the pressure in the inner cavity of the housing 1 is too high, the liquid injection may become difficult.

[0694] Example 22

[0695] Unlike Example 21, as shown in Figures 51 and 52 , this embodiment includes a gas chamber 9 on the top plate 12 of the outer shell. This gas chamber 9 covers the gas port on the top of each cell 2 in the large-capacity battery. The gas port is a through-hole directly formed in the upper cover plate of the cell 2 and extending through the inner cavity of the cell 2. The inner cavity of the gas chamber 9 communicates with the gas area within the inner cavity of each cell 2 through this gas port. The gas chamber 9 serves as a shared gas chamber for each cell 2. Based on this gas chamber 9, the gas areas of each cell 2 can be connected to achieve gas balance, allowing each cell 2 to share gas to ensure consistency, thereby improving the cycle life of the large-capacity battery to a certain extent. When any cell 2 experiences thermal runaway, the smoke from the inner cavity of that cell 2 enters the gas chamber 9 and is discharged through the gas chamber 9, thereby improving the safety of the large-capacity battery.

[0696] Correspondingly, this embodiment adopts the liquid injection component 242 in Example 18, and the second channel 24212 is connected to the gas chamber 9.

[0697] It should be noted that, since the electrolyte circulation pipe section 52 is a curved pipe, some structures are not shown in the cross-sectional view of FIG52 .

[0698] To improve the stability of the individual cells 2, this embodiment, as shown in Figure 53, incorporates multiple partitions 58 within the housing 1, dividing the housing 1 into ten individual cell 2 mounting cavities. Each of these cavities houses a single cell 2. The addition of partitions 58 also prevents individual cells 2 from swelling, which could compromise the cycling performance of large-capacity batteries. Furthermore, heat generated during the charge and discharge process of each cell 2 can be transferred to the exterior via the second partitions 58, reducing the risk of thermal runaway. The housing also further enhances the strength of the cylinder. As shown in Figure 53, a mounting space 59 for the fluid injection component 242 is formed between the first sidewall 311 and the adjacent partition 58. In this embodiment, the fluid injection component body 2421 is located at one end of the mounting space 59, leaving a gap between the partition 58 and the second channel 24212 to facilitate communication between the second channel 24212 and the gas chamber 9. To enhance the structural strength of the mounting space 59, reinforcing ribs 591 may be incorporated within the mounting space 59.

[0699] The following describes the fluid replenishment process of this embodiment by taking the blocking member 2422 as the first rubber ring 364, the second hot melt member 365 and the cap 362 as an example:

[0700] When fluid replacement is needed, follow these steps:

[0701] Remove the cap 362 and use a cutter to open a hole in the second hot melt member 365 that passes through the first channel 24211 and the second channel 24212 ;

[0702] When there is gas in the inner cavity of the housing 1, the gas will overflow from the second channel 24212, making it easier to inject liquid into the inner cavity of the housing 1. In order to ensure smoother liquid injection, in this step, an exhaust pipe can be inserted into the second channel 24212, and an external exhaust device connected to the exhaust pipe can be started to exhaust gas, so that a certain negative pressure is formed in the inner cavity of the housing 1.

[0703] Afterwards, the electrolyte injection tube is extended into the first channel 24211 and the electrolyte is injected. During the injection process, if there is a problem of injection difficulty, the external exhaust device can be activated to form a certain negative pressure in the inner cavity of the housing 1 before the injection is continued;

[0704] After the rehydration is completed, remove the electrolyte injection tube and the air extraction tube;

[0705] Afterwards, the opening is sealed by hot melting;

[0706] Finally, after the hot melt material cools down, the cap 362 is sealed and fixed on the liquid injection component body 2421.

[0707] When the fluid needs to be changed, follow these steps:

[0708] Remove the cap 362 and use a cutter to open a hole in the second hot melt member 365 that passes through the first channel 24211 and the second channel 24212 ;

[0709] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte. If the electrolyte cannot be extracted, insert the gas injection tube into the second channel 24212 and inject protective gas into the inner cavity of the housing 1 to extract the electrolyte. After the extraction is completed, remove the electrolyte extraction tube and the gas injection tube, insert the electrolyte injection tube into the first channel 24211, and inject new electrolyte. After the injection is completed, remove the electrolyte injection tube.

[0710] Afterwards, hot melt material is poured into the opening to seal it; after the hot melt material cools down, the cap 362 is sealed and fixed on the liquid injection component body 2421.

[0711] Examples 23 to 30 provide a fluid injection and exchange component and a lithium-ion battery having the fluid injection and exchange component. The fluid injection and exchange component is mainly composed of a fluid injection and exchange component body and a sealing component. The fluid injection and exchange component body is fixed on the lithium-ion battery shell, and a first channel that penetrates the inner cavity of the shell is opened on the fluid injection and exchange component body; the sealing component is used to seal the first channel from the outside of the shell.

[0712] After a period of charge and discharge cycles of a lithium-ion battery, the performance is reduced due to the decomposition and consumption of the electrolyte. The sealing member can be opened and the electrolyte can be added to the inner cavity of the shell through the first channel on the main body of the liquid injection component to improve the performance of the lithium-ion battery. Alternatively, after a period of charge and discharge cycles of a lithium-ion battery, the performance of the lithium-ion battery is affected by the appearance of impurities in the electrolyte. The electrolyte in the inner cavity of the shell can also be replaced by the liquid injection component to improve the performance of the lithium-ion battery. The replacement here can be a partial replacement or a complete replacement. After completing the liquid replenishment or liquid replacement operation, the first channel can be blocked from the outside of the shell using the sealing member. The operation is simple and convenient.

[0713] It should be noted that the first channel can be communicated with the electrolyte area of ​​the inner cavity of the shell, and can also be communicated with the gas area of ​​the inner cavity of the shell; when it is communicated with the gas area, it can also serve as an exhaust channel.

[0714] It should also be noted that the above-mentioned lithium-ion battery can be a lithium-ion single battery or a lithium-ion battery module with a shell.

[0715] If it is a lithium-ion single cell battery, the liquid injection and replacement component can be fixed at any position of the lithium-ion single cell battery shell, preferably fixed on the liquid injection port of the lithium-ion single cell battery to achieve the function of replenishing or replacing the electrolyte.

[0716] If it is a lithium-ion battery module (also known as a lithium-ion battery pack or a large-capacity battery), the liquid injection and replacement component can also be fixed to any part of the lithium-ion battery module shell. Based on the liquid injection and replacement component, the electrolyte in the inner cavity of the shell can be replenished or replaced.

[0717] The following further describes Examples 23 to 30 with reference to the accompanying drawings.

[0718] Example 23

[0719] 54 is a schematic structural diagram of the fluid injection and replacement component 242 of this embodiment. The fluid injection and replacement component 242 of this embodiment includes a fluid injection and replacement component body 2421 and a blocking member 2422 disposed on the fluid injection and replacement component body 2421.

[0720] The fluid injection component body 2421 is used to be fixed to the lithium-ion battery housing 1. As shown in Figure 55, in this embodiment, the fluid injection component body 2421 is a cylinder. In other embodiments, rectangular columns, semi-cylinders, etc. can also be used. To facilitate its fixation to the lithium-ion battery housing 1, this embodiment provides an annular limiting boss 511 along the outer circumference of the fluid injection component body 2421. A mounting hole 5421 is provided in the lithium-ion battery housing 1 (see Figure 71). The fluid injection component body 2421 is fixed in the mounting hole 5421. The annular limiting boss 511 is welded to the area of ​​the housing 1 surrounding the mounting hole 5421 to achieve fixation and seal the mounting hole 5421.

[0721] A through hole is provided in the fluid injection / exchange component body 2421. This through hole can be a straight through hole as shown in Figures 55 and 56, or an L-shaped through hole as shown in Figure 57, serving as the first channel 24211. After the fluid injection / exchange component body 2421 is secured to the lithium-ion battery housing 1, one end of the first channel 24211 is located outside the housing 1, and the other end is located inside the housing 1, for communication with the electrolyte region within the inner cavity of the housing 1.

[0722] As shown in Figure 58, in this embodiment, an electrolyte circulation pipe section 52 is added to realize the connection between the first channel 24211 and the electrolyte area in the inner cavity of the shell 1. One end of the electrolyte circulation pipe section is fixed on the liquid injection and replacement component body 2421 and is connected to the first channel 24211; the other end is used to communicate with the electrolyte area in the inner cavity of the shell 1.

[0723] It should be noted that the end of the electrolyte circulation pipe section that is connected to the electrolyte area in the inner cavity of the shell 1 can be directly extended into the bottom of the inner cavity of the shell 1 and is always immersed in the electrolyte. When the liquid needs to be replaced, as much electrolyte as possible can be extracted from the inner cavity of the shell 1, making the liquid replacement more thorough. In order to achieve a more thorough liquid replacement, as shown in Figures 59 and 60, a groove 616 can be provided on the bottom plate of the shell, and multiple notches 617 can be opened at the end of the electrolyte circulation pipe section 52. The electrolyte circulation pipe section can be directly extended into the groove 616, and the electrolyte in the inner cavity of the shell can be basically completely extracted through the electrolyte circulation pipe section.

[0724] In some other embodiments, an electrolyte flow channel may be provided in the housing 1 to communicate with the first channel 24211, thereby communicating with the electrolyte area within the housing 1. However, compared to this embodiment, the structure is more complex, and if the electrolyte flow channel cannot extend to the bottom of the inner cavity of the housing 1, incomplete electrolyte replacement may occur.

[0725] In this embodiment, the electrolyte circulation pipe section and the liquid injection and exchange component body 2421 can be an integral part or a split part. When it is a split part, it can be connected to the liquid injection and exchange component body 2421 by welding or screwing, or it can be connected to the electrolyte circulation pipe section through a quick-plug connector 663 (as shown in Figure 61, the electrolyte circulation pipe section is not shown in the figure).

[0726] The material of the electrolyte circulation pipe section is generally selected from the same aluminum material as the liquid injection component body 2421. It can also be an organic material such as rubber that does not react with the electrolyte.

[0727] The blocking member 2422 of this embodiment, as shown in FIG. 55 and FIG. 56 , includes a first rubber ring 364 and a first sealing plate 65 , and blocks the first channel 24211 from the outside of the housing 1 by hot melting.

[0728] Typically, the main body 2421 of the fluid injection / exchange member is made of the same aluminum material as the lithium-ion battery housing 1. To seal the first channel 24211 by heat-melting, this embodiment secures a first rubber ring 364 within the first channel 24211 by adhesive sealing, and secures a first sealing plate 65 to the first end face of the first rubber ring 364 by heat-melting, thereby sealing the first channel 24211. The first end face of the first rubber ring 364 is the end of the first rubber ring 364 that is away from the lithium-ion battery housing 1. The first rubber ring 364 and the first sealing plate 65 are typically made of a rubber material that does not react with the electrolyte, such as fluororubber, nitrile rubber, natural rubber, or EPDM rubber.

[0729] As can be seen in Figure 56 , the axial length of the first rubber ring 364 in this embodiment is greater than the axial length of the first channel 24211. One end of the first rubber ring 364 extends beyond the first channel 24211. An annular hem 641 is provided along the outer side of the end of the first rubber ring 364 extending beyond the first channel 24211. The annular hem 641 is in close contact with the end surface of the first channel 24211. The addition of the annular hem improves the bonding strength between the first rubber ring 364 and the main body of the fluid injection / exchange component and increases the contact area between the first sealing plate 65 and the first rubber ring 364, further enhancing the bonding strength and sealing effect.

[0730] When the fluid needs to be replenished, a cutter is used to open an opening through the first channel 24211 on the first sealing plate 65; the electrolyte injection tube is inserted into the first channel 24211 and the electrolyte is injected. After the replenishment is completed, the electrolyte injection tube is pulled out; and hot-melt material is poured into the opening to seal it.

[0731] Example 24

[0732] Unlike Example 23, as shown in Figure 62, the sealing member 2422 of this embodiment also includes a sealing post 618 fixed to the first rubber ring 364 via heat-melting. This double-sealing method seals the first channel 24211, providing a superior sealing effect. When fluid replenishment is required, a cutter is used to create an opening through the first sealing plate 65 and the sealing post 618, extending through the first channel 24211. The electrolyte injection tube is inserted into the first channel 24211 and injected with electrolyte. Once replenishment is complete, the electrolyte injection tube is removed, and hot-melt material is poured into the opening to seal it.

[0733] Example 25

[0734] Different from the above-mentioned embodiment 23, as shown in Figures 63 and 64, the sealing member 2422 in this embodiment also includes a cap 362 (which can be a nut) that is fastened on the main body 2421 of the fluid injection and exchange component and is threadedly connected to the main body 2421 of the fluid injection and exchange component. A sealing ring can be provided at the threaded connection part to improve the sealing of this part.

[0735] This embodiment uses two or three seals to block the first channel 24211, which has a good sealing effect.

[0736] In some other embodiments, the cap 362 may also be connected to the fluid injection and replacement component body 2421 in an interference fit manner, but compared with this embodiment, disassembly is more difficult.

[0737] In some other embodiments, the cap 362 can also serve as a sealing member 2422 to seal the first channel 24211 alone, but the sealing reliability is poor compared to this embodiment and embodiment 23.

[0738] Example 26

[0739] In this embodiment, based on the above embodiment, a second channel 24212 is provided on the fluid injection component body 2421 , and the blocking member 2422 in the above embodiment is also used to block the second channel 24212 , as specifically shown in FIG. 65 to FIG. 67 .

[0740] In this embodiment, another through-hole is provided in the main body 2421 of the fluid injection / exchange member along its axial direction, serving as a second channel 24212. For ease of processing, the second channel 24212 in this embodiment is a circular straight through-hole. In other embodiments, the second channel 24212 may also be an L-shaped through-hole, the cross-section of which may be adjusted based on actual needs. As long as the second channel 24212 is connected to the gas zone within the inner cavity of the housing 1, the protective gas can be injected into the inner cavity of the housing 1 or the gas within the inner cavity of the housing 1 can be exhausted through the second channel 24212.

[0741] As can be seen in Figures 66 and 67 , in order to utilize the blocking member 2422 of Example 23 to simultaneously block both the first channel 24211 and the second channel 24212, this embodiment designates the first channel 24211 as a stepped through-hole extending axially along the fluid injection / exchange member body 2421. The second channel 24212 is isolated from the small hole 6122 of the stepped through-hole and communicates with the large hole 6121 of the stepped through-hole. The first rubber ring 364 is coaxially secured within the large hole 6121 of the stepped through-hole. The first sealing plate 65 is hot-melt-attached to the first end face of the first rubber ring 364, simultaneously blocking both the first channel 24211 and the second channel 24212.

[0742] In Figure 66, the axial length of the first rubber ring 364 is greater than the axial length of the large hole 6121 of the step through hole; one end of the first rubber ring 364 is in close contact with the step surface of the step through hole, and the other end extends out of the large hole 6121 of the step through hole; an annular folding edge is provided along its circumference on the outer side of the other end of the first rubber ring 364; the annular folding edge is in close contact with the end face of the large hole of the step through hole.

[0743] In Figure 67, a sealing column 618 is also provided in the first rubber ring 364. In order to prevent the tool head from contacting the fluid injection component body 2421 in the axial direction when opening the hole, thereby damaging the tool head or the fluid injection component body 2421, the axial length of the sealing column 618 is smaller than the large hole 6121 of the step through hole, so that a certain space is left between the sealing column 618 and the fluid injection component body 2421 in the axial direction.

[0744] Example 27

[0745] Unlike Example 26, as shown in Figure 68, the cross-section of the second channel 24212 of this embodiment is a sector ring. This sector ring is concentric with the first channel 24211. Compared with Example 25, under the condition that the second channel 24212 has the same flow area, the radial dimension requirement of the liquid injection and replacement component body 2421 is smaller. The liquid injection and replacement component body 2421 with a limited volume can be provided with an inlet or outlet channel with the largest flow area, further reducing the difficulty of liquid extraction or injection.

[0746] Example 28

[0747] Different from Example 26, as shown in FIG69 , the second channel 24212 of this embodiment is composed of a plurality of through holes opened along the axial direction of the fluid injection and replacement component body 2421 , and the plurality of through holes are arranged along the same circumference.

[0748] Similar to the fan ring, under the condition that the second channel 24212 of this embodiment has the same flow area, the radial dimension requirement for the liquid injection and exchange component body 2421 is relatively small, and an air inlet or outlet channel with the largest flow area can be opened on the liquid injection and exchange component body 2421 with a limited volume, further reducing the difficulty of extracting or injecting liquid.

[0749] Example 29

[0750] As shown in Figure 70, this embodiment is a lithium-ion battery, specifically a large-capacity battery, comprising a housing 1, a fluid injection / exchange member 242 secured to the housing 1, and ten single cells 2 arranged in parallel within the housing 1. The single cells 2 described in this embodiment may be prismatic batteries, the specific number of which can be adjusted based on actual needs. The interior of each single cell 2 includes an electrolyte region and a gas region.

[0751] The housing 1 is provided with an electrolyte sharing chamber 4 ; the electrolyte sharing chamber 4 is in communication with the electrolyte areas in the inner cavities of the individual cells 2 .

[0752] It should be noted that the electrolyte shared chamber 4 is an electrolyte containing chamber, which is connected to the electrolyte area of ​​each single battery 2 to ensure that the electrolyte in the entire large-capacity battery does not come into contact with the external environment.

[0753] In order to improve the heat dissipation performance of such large-capacity batteries, an avoidance hole can be opened on the shell 1 to allow the polarity terminals of each single battery 2 to extend out; the polarity terminals of each single battery 2 extend out of the avoidance hole and the cylindrical top plate area around the avoidance hole is fixedly sealed with the shell of the single battery 2.

[0754] It should be noted that the polarity terminal of the single cell battery 2 described here can be the pole of the single cell battery 2. If it is to be avoided that the pole of the single cell battery 2 cannot be smoothly extended out of the avoidance hole as a polarity terminal, a pole adapter can also be connected to the pole of the single cell battery 2, and the overall structure of the pole of the single cell battery 2 and the pole adapter can be used as the polarity terminal of the single cell battery 2.

[0755] The fluid injection and replacement member 242 is fixed to the housing 1 .

[0756] For the convenience of description, the length direction of the housing 1 is defined as the x direction, the width direction is defined as the y direction, and the height direction is defined as the z direction.

[0757] This embodiment adopts the liquid injection component 242 of Example 23 or Example 24. The liquid injection component 242 can be fixed at any position of the housing 1. For example, in this embodiment, the liquid injection component 242 is arranged on the first side wall 311 (the side wall parallel to the yz plane) of the housing 1. After the large-capacity battery is charged and discharged for a period of time, the electrolyte is reduced due to decomposition and consumption, resulting in a decrease in the performance of the large-capacity battery. The liquid injection component 242 can be used to replenish electrolyte into the electrolyte shared chamber 4 and the inner cavity of each single cell 2 to improve the performance of the large-capacity battery. Alternatively, after the large-capacity battery is charged and discharged for a period of time, the electrolyte is affected by the presence of impurities in the electrolyte. The liquid injection component 242 can also be used to replace the electrolyte in the electrolyte shared chamber 4 and the inner cavity of each single cell 2 to improve the performance of the large-capacity battery. The replacement here can be a partial replacement or a complete replacement. In addition, after the electrolyte areas in the inner cavities of the individual cells 2 are connected to the electrolyte shared chamber 4 , electrolyte can be re-injected into the inner cavities of the individual cells 2 and the electrolyte shared chamber 4 through the liquid injection component 242 to ensure the continuity of the electrolyte.

[0758] 71 , in this embodiment, a mounting hole 5421 is provided on the first side wall 311 of the housing 1, adapted to the cross-sectional shape of the fluid replacement body. The fluid replacement member body 2421 is coaxially positioned within the mounting hole 5421, and the annular limiting boss 511 is seal-welded to the area surrounding the mounting hole 5421. When such large-capacity batteries are assembled into an energy storage device, multiple large-capacity batteries are arranged along their width, with the first side walls 311 of each exposed. Positioning the fluid replacement member 242 on the first side wall 311 facilitates fluid replacement operations.

[0759] The following describes the process of replenishing and replacing fluid by taking the blocking member 2422 as the first rubber ring 364, the first sealing plate 65 and the cap 362 as an example:

[0760] When fluid replacement is needed, follow these steps:

[0761] Remove the cap 362 and use a cutter to create an opening on the first sealing plate 65 that passes through the first channel 24211 ;

[0762] Insert the electrolyte injection tube into the first channel 24211 and inject the electrolyte. After the electrolyte injection is completed, remove the electrolyte injection tube.

[0763] The hot melt material is poured into the opening to seal it; after the hot melt material cools down, the cap 362 is sealed and fixed on the liquid injection component body 2421.

[0764] When the fluid needs to be changed, follow these steps:

[0765] Remove the cap 362 and use a cutter to create an opening on the first sealing plate 65 that passes through the first channel 24211 ;

[0766] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte; then, insert the electrolyte injection tube into the first channel 24211 and inject new electrolyte; after the injection is completed, remove the electrolyte injection tube;

[0767] The hot melt material is poured into the opening to seal it; after the hot melt material cools down, the cap 362 is sealed and fixed on the liquid injection component body 2421.

[0768] It should be noted that, in this embodiment, during the liquid injection process, if the pressure in the inner cavity of the shell 1 is too high, liquid injection may be difficult. In this case, the liquid can be injected after the air is exhausted.

[0769] Example 30

[0770] Unlike Example 29, as shown in FIG72 , this embodiment includes a gas chamber 9 on the top plate of the housing 1. The gas chamber 9 covers the gas port on the top of each cell 2 in the large-capacity battery. The gas port is a through-hole directly provided on the upper cover plate of the cell 2 and extending through the inner cavity of the cell 2. The inner cavity of the gas chamber communicates with the gas area within the inner cavity of each cell 2 through the gas port. The gas chamber serves as the gas chamber for each cell 2. Based on the gas chamber, the gas areas of each cell 2 can be connected to achieve gas balance, allowing each cell 2 to share gas to ensure consistency among the cells 2, thereby improving the cycle life of the large-capacity battery to a certain extent. When any cell 2 experiences thermal runaway, the smoke from the inner cavity of that cell 2 enters the gas chamber and is discharged through the gas chamber, thereby improving the safety of the large-capacity battery.

[0771] Correspondingly, this embodiment adopts the liquid injection component 242 in Example 26, and the second channel 24212 is connected to the gas chamber 9.

[0772] To improve the stability of the individual cells 2, this embodiment, as shown in Figure 73, incorporates multiple partitions 58 within the housing 1, dividing the housing 1 into ten individual cell 2 mounting cavities. Each of these cavities houses a single cell 2. The addition of partitions 58 also prevents individual cells 2 from swelling, which could compromise the cycling performance of large-capacity batteries. Furthermore, heat generated during charging and discharging by each cell 2 can be transferred to the exterior via the second partitions 58, reducing the risk of thermal runaway. The housing also further enhances the strength of the cylinder. As shown in Figure 73, a mounting space 59 for the fluid injection component 242 is formed between the first sidewall 311 and the adjacent partition 58. In this embodiment, the fluid injection component main body 2421 is located at one end of the mounting space 59, leaving a gap between the partition 58 and the second channel 24212 to facilitate communication between the second channel 24212 and the gas chamber. To enhance the structural strength of the mounting space 59, reinforcing ribs 591 may be added within the mounting space 59.

[0773] The following describes the fluid replenishment process of this embodiment by taking the blocking member 2422 as the first rubber ring 364, the first sealing plate 65 and the cap 362 as an example:

[0774] When fluid replacement is needed, follow these steps:

[0775] Remove the cap 362 and use a cutter to create an opening on the first sealing plate 65 that passes through the first channel 24211 and the second channel 24212 ;

[0776] When there is gas in the inner cavity of the housing 1, the gas will overflow from the second channel 24212, making it easier to inject liquid into the inner cavity of the housing 1. In order to ensure smoother liquid injection, in this step, an exhaust pipe can be inserted into the second channel 24212, and an external exhaust device connected to the exhaust pipe can be started to exhaust gas, so that a certain negative pressure is formed in the inner cavity of the housing 1.

[0777] Afterwards, the electrolyte injection tube is extended into the first channel 24211 and the electrolyte is injected. During the injection process, if there is a problem of injection difficulty, the external exhaust device can be activated to form a certain negative pressure in the inner cavity of the housing 1 before the injection is continued;

[0778] After the rehydration is completed, remove the electrolyte injection tube and the air extraction tube;

[0779] Afterwards, the opening is sealed by hot melting;

[0780] Finally, after the hot melt material cools down, the cap 362 is sealed and fixed on the liquid injection component body 2421.

[0781] When the fluid needs to be changed, follow these steps:

[0782] Remove the cap 362 and use a cutter to create an opening on the first sealing plate 65 that passes through the first channel 24211 and the second channel 24212 ;

[0783] Insert the electrolyte extraction tube into the first channel 24211 and extract the electrolyte. If the electrolyte cannot be extracted, insert the gas injection tube into the second channel 24212 and inject protective gas into the inner cavity of the housing 1 to extract the electrolyte. After the extraction is completed, remove the electrolyte extraction tube and the gas injection tube, insert the electrolyte injection tube into the first channel 24211, and inject new electrolyte. After the injection is completed, remove the electrolyte injection tube.

[0784] Afterwards, hot melt material is poured into the opening to seal it; after the hot melt material cools down, the cap 362 is sealed and fixed on the liquid injection component body 2421.

[0785] Examples 31 to 33 provide a large-capacity battery assembly, including a large-capacity battery and a repair mechanism. The large-capacity battery includes a housing and m parallel-connected single cells arranged within the housing, where m>1. The single cells may be prismatic batteries or multiple commercially available parallel-connected soft-pack batteries. The interior of each single cell includes an electrolyte region and a gas region.

[0786] For the convenience of description, the length direction of the shell is defined as the x direction, the width direction of the shell is defined as the y direction, and the height direction of the shell is defined as the z direction.

[0787] The outer shell is provided with an electrolyte sharing chamber and a gas chamber; the electrolyte sharing chamber is connected to the electrolyte area of ​​the inner cavity of each single cell; the gas chamber is connected to the gas area of ​​the inner cavity of each single cell; the repair mechanism includes a gas injection and exhaust component and a liquid injection and replacement component, the gas injection and exhaust component is used to realize the gas replenishment or exhaust of the gas chamber and the inner cavity of each single cell; the liquid injection and replacement component is used to replenish electrolyte into the electrolyte sharing chamber and the inner cavity of each single cell, or replace the electrolyte in the electrolyte sharing chamber and the inner cavity of each single cell.

[0788] The housing can have at least the following two structures:

[0789] The first structure includes a first cylinder with open ends at both ends (i.e., the end portion of the first cylinder parallel to the yz plane is the open end) and end plate assemblies respectively fixed to the two open ends of the first cylinder (i.e., the end plate assemblies are parallel to the yz plane);

[0790] On the shell of the first structure, the electrolyte sharing chamber can be located on the side plate of the first cylinder (the side plate parallel to the xz plane) or the bottom plate of the first cylinder, the gas chamber can be located on the side plate of the first cylinder (the side plate parallel to the xz plane) or the top plate of the first cylinder, and the gas injection and exhaust components and the liquid injection and exchange components can be located at any position of the shell as long as they can realize the corresponding functions.

[0791] The second structure includes a second cylinder with open ends at the top and bottom (i.e., the ports in the second cylinder parallel to the xy plane are open ends) and an upper cover plate and a lower cover plate respectively fixed to the open ends of the top and bottom of the second cylinder (i.e., the upper cover plate and the lower cover plate are parallel to the xy plane); in this structure, the side wall in the second cylinder parallel to the yz plane is called an end plate assembly.

[0792] On the shell of the second structure, the electrolyte sharing chamber can be located on the second cylinder side plate (the side plate parallel to the xz plane) or the lower cover plate, the gas chamber can be located on the second cylinder side plate (the side plate parallel to the xz plane) or the upper cover plate, and the gas injection and exhaust components and the liquid injection and exchange components can be located at any position of the shell as long as they can realize the corresponding functions.

[0793] In Examples 31 to 33, the first structure is mainly used as an example for introduction.

[0794] It should be noted here that the above-mentioned electrolyte shared chamber is an electrolyte containing chamber. After it is connected with the electrolyte area of ​​the inner cavity of each single battery, it is necessary to ensure that the electrolyte in the entire large-capacity battery does not come into contact with the external environment.

[0795] In order to improve the heat dissipation performance of such large-capacity batteries, an avoidance hole is opened on the top plate of the first cylinder to allow the polarity terminals of each single battery to extend out; the polarity terminals of each single battery extend out of the avoidance hole and the first cylinder top plate area around the avoidance hole is fixedly sealed with the single battery shell.

[0796] It should be noted that the single cell polarity terminal described here can be a single cell pole. In order to prevent the single cell pole from being unable to smoothly extend out of the avoidance hole as a polarity terminal, a pole adapter can also be connected to the single cell pole, and the overall structure of the single cell pole and the pole adapter can be used as the single cell polarity terminal.

[0797] The gas injection and exhaust components and the liquid injection and replacement components can be located at any position of the shell, for example, they can be set on the side wall of the first cylinder parallel to the xz plane, and can also be set on the end plate assembly. After the large-capacity battery is charged and discharged for a period of time, the electrolyte is decomposed and consumed and reduced, resulting in a decrease in the performance of the large-capacity battery. The gas injection and exhaust components can be used to change the pressure in the electrolyte shared chamber and the inner cavity of each single cell. The electrolyte can be smoothly replenished into the electrolyte shared chamber and the inner cavity of each single cell through the liquid injection and replacement components to improve the performance of the large-capacity battery. Or, when the large-capacity battery is charged and discharged for a period of time, the electrolyte appears in the electrolyte, which affects the performance of the large-capacity battery. The gas injection and exhaust components and the liquid injection and replacement components can also be used to replace the electrolyte in the electrolyte shared chamber and the inner cavity of each single cell to improve the performance of the large-capacity battery. The replacement here can be a partial replacement or a complete replacement. In addition, after the electrolyte areas in the inner cavities of each single cell and the electrolyte shared chamber are connected, electrolyte can be injected again into the inner cavities of each single cell and the electrolyte shared chamber through the cooperation of the gas injection and exhaust components and the liquid injection and replacement components to ensure the continuity of the electrolyte.

[0798] The gas injection and exhaust components and the liquid injection and exchange components can be located on the same end plate assembly or on different end plate assemblies. For ease of operation, they are preferably located on the same end plate assembly. In addition, a liquid circuit unpacking device operating port can also be provided on the end plate assembly provided with the gas injection and exhaust components and the liquid injection and exchange components. The unpacking device extends into the electrolyte shared chamber through the liquid circuit unpacking device operating port to unpack each single battery, so that the electrolyte shared chamber and the electrolyte area of ​​the inner cavity of each single battery are connected (when opening the package, the unpacking device extends into the electrolyte shared chamber through the liquid circuit unpacking device operating port to open the sealing film sealed at the opening of the lower cover plate of each single battery. The specific sealing film can adopt the sealing film disclosed in Chinese patents CN218525645U and CN218525614U). In order to avoid interference with the gas injection and exhaust components and the liquid injection and replacement components, the air circuit unpacking device operating port can be set on the other end plate assembly, and the unpacking device extends into the gas chamber through the air circuit unpacking device operating port to unpack each single battery, so that the gas chamber and the gas area of ​​the inner cavity of each single battery are connected (when opening the package, the unpacking device extends into the gas chamber through the air circuit unpacking device operating port to open the sealing film or explosion-proof film sealed at the opening of the upper cover plate of each single battery).

[0799] The opening of the package opening device also serves as an explosion vent. After opening the package, the explosion vent is seal-welded to the end plate assembly surrounding the opening. Correspondingly, the other end plate assembly can be a flat plate that seals the other open end of the first cylinder, simultaneously sealing the open end of the electrolyte shared chamber and, if present, the open end of the gas chamber.

[0800] The explosion vent can also be located on another end plate assembly different from the operating port of the package opening device. The end plate assembly is provided with a first explosion vent channel. The air inlet end of the first explosion vent channel is used to communicate with the gas chamber of the large-capacity battery, and the air outlet end is connected to the explosion vent.

[0801] The following describes Examples 31 to 33 in detail with reference to the accompanying drawings.

[0802] Example 31

[0803] As shown in Figures 74 to 76, this embodiment of a high-capacity battery includes a housing 1 and ten parallel-connected cells 2 within the housing. These cells 2 are prismatic. The number of cells in other embodiments can be adjusted based on actual needs. Each cell 2 has a through-hole extending through its inner cavity, defined by the bottom and top of the housing.

[0804] The housing 1 includes a first cylinder 23 with open ends at both ends and end plate assemblies 24 respectively fixed to the two open ends of the first cylinder 23;

[0805] An electrolyte sharing chamber 4 extending along the x-direction is provided on the first cylinder bottom plate 231 ; the electrolyte sharing chamber 4 is connected to the electrolyte area of ​​the inner cavity of each single battery 2 through the through hole of the single battery 2 .

[0806] A gas chamber 9 extending along the x-direction is provided on the top plate 232 of the first cylinder; the gas chamber 9 is connected to the gas area of ​​the inner cavity of each single battery 2 through the through hole of the single battery 2.

[0807] The first cylindrical top plate 232 defines a clearance hole 13 through which the polarity terminals of each battery cell 2 can extend. Each battery cell 2 polarity terminal extends through the clearance hole 13, and the area surrounding the clearance hole 13 on the first cylindrical top plate 232 is securely sealed to the battery cell 2 housing. As can be seen from the figure, in this embodiment, the polarity terminals of the battery cell 2 refer to the integrated structure of the battery cell post 21 and the post adapter 6.

[0808] In conjunction with Figures 77 and 78, one of the end plate assemblies 24 of this embodiment includes a first sub-end plate 241, which is sealed at one of the open ends of the first cylinder 23, the electrolyte shared chamber 4, and the gas chamber 9; the first sub-end plate 241 is provided with an electrolyte flow channel 2411 and a gas flow channel 2414, and a gas injection and exhaust component 745 and an injection and exhaust component 746 are provided on the outer surface 2412 of the first sub-end plate (wherein the outer surface 2412 of the first sub-end plate refers to the surface of the first sub-end plate 241 away from each single battery 2 in the first cylinder 23). Liquid exchange component 242; as can be seen from the figure, the electrolyte flow channel 2411 and the gas flow channel 2414 in this embodiment are two mutually isolated L-shaped through holes opened on the first sub-end plate 241, and the L-shaped through holes include horizontal holes and vertical holes, wherein the horizontal holes are opened along the thickness direction of the first sub-end plate 241, and the vertical holes are opened along the height direction of the first sub-end plate 241; in order to facilitate the opening of the vertical holes, a groove can be first opened on the inner surface of the first sub-end plate 241, and then a cover plate is covered at the opening of the groove to form a vertical hole.

[0809] In some other embodiments, the electrolyte flow channel 2411 may also be a through groove opened on the inner surface of the first sub-end plate 241, but compared with this embodiment, it is not easy to extract the electrolyte.

[0810] As shown in Figures 77 and 78, the gas injection and exhaust component 745 includes a gas injection and exhaust component body 7451 and a first blocking member 7452 fixed on the gas injection and exhaust component body 7451; in this embodiment, the gas injection and exhaust component body 7451 is a cylinder, and in some other embodiments, a rectangular column, a semi-cylinder, etc. can also be used; a gas through hole is opened on the gas injection and exhaust component body 7451 along the axial direction of the gas injection and exhaust component body 7451, serving as a first channel 74511, which is connected to the gas flow channel 2414.

[0811] The fluid injection and exchange component 242 includes a fluid injection and exchange component body 2421 and a second sealing member 7422 fixed on the fluid injection and exchange component body 2421; in this embodiment, the fluid injection and exchange component body 2421 is a cylinder, and in some other embodiments, a rectangular column, a semi-cylinder, etc. can also be used; an electrolyte through hole is opened on the fluid injection and exchange component body 2421 along the axial direction of the fluid injection and exchange component body 2421, serving as a second channel 74211, which is connected to the electrolyte circulation channel 2411.

[0812] In this embodiment, the first blocking member 7452 and the second blocking member 7422 are respectively the first cap and the second cap (which can be nuts) fastened on the gas injection and exhaust component body 7451 and the fluid injection and exchange component body 2421, and are threadedly connected to the gas injection and exhaust component body 7451 and the fluid injection and exchange component body 2421. A sealing ring can be provided at the threaded connection part to improve the sealing of this part, thereby blocking the first channel 74511 and the second channel 74211 respectively.

[0813] In some other embodiments, the corresponding caps can also be connected to the gas injection and exhaust component body 7451 and the liquid injection and replacement component body 2421 in an interference fit manner, but compared with this embodiment, disassembly is more difficult.

[0814] In other embodiments, the first and second sealing members 7452 and 7422 may further include elastic sealing posts fixed within the first and second channels 74511 and 74211 to further ensure the sealing between the first and second channels 74511 and 74211. The elastic sealing posts may be made of a rubber material that does not react with the electrolyte, such as fluororubber, nitrile rubber, natural rubber, or EPDM rubber.

[0815] After the end plate assembly 24 is secured to the open end of the first cylinder 23, the ends of the gas flow channel 2414 communicate with the gas chamber 9 and the first channel 74511 of the gas injection and exhaust member 745. The ends of the electrolyte flow channel 2411 communicate with the electrolyte shared chamber 4 and the second channel 74211 of the liquid injection and replacement member 242.

[0816] To facilitate unpacking, as shown in Figures 77 and 78, this embodiment may further include an unpacking device operating port 2413 on the first sub-end plate 241. The unpacking device extends through the unpacking device operating port 2413 into the electrolyte shared chamber 4 to unpack each single battery 2, thereby connecting the electrolyte shared chamber 4 with the electrolyte area within the inner cavity of each single battery 2. (During unpacking, the unpacking device extends through the unpacking device operating port 2413 into the electrolyte shared chamber 4 to open the sealing film sealed at the through-hole of the lower cover plate 03 of each single battery. The specific sealing film may be the sealing film disclosed in Chinese patents CN218525645U and CN218525614U.) It should be noted that after unpacking is completed, the unpacking device operating port 2413 needs to be sealed with a sealing member.

[0817] Referring to Figure 79, this embodiment can also be provided with a first explosion relief channel 26 and an explosion relief port 27 on the other end plate assembly 24 of the large-capacity battery (which is not provided with the gas injection and exhaust component 745 and the liquid injection and replacement component 242). The two ends of the first explosion relief channel 26 are respectively connected to the gas chamber 9 and the explosion relief port 27, and the explosion relief port 27 is sealed with an explosion relief mechanism. A hollow component with an explosion relief membrane at one end can be used as the explosion relief mechanism. When any single cell 2 experiences thermal runaway, the thermal runaway smoke enters the first explosion relief channel 26 from the gas chamber 9, breaks through the explosion relief membrane and is discharged from the explosion relief port 27.

[0818] As can be seen from Figure 79, the other end plate assembly 24 of this embodiment includes a third sub-end plate 28 and a fourth sub-end plate 29. The third sub-end plate 28 and the fourth sub-end plate 29 are parallel to each other, and there is a gap between them (the third sub-end plate 28 is in close contact with the outermost single battery 2 located in the first cylinder 23). This embodiment uses the gap as the first explosion relief channel 26.

[0819] In this embodiment, screws are used to secure the third sub-end plate 28 to the fourth sub-end plate 29. It should be noted that, in order to ensure that the first explosion relief channel 26 is formed between the third sub-end plate 28 and the fourth sub-end plate 29, the length of the screw in the x-direction should be greater than the gap between the third sub-end plate 28 and the fourth sub-end plate 29, and less than the distance between the inner surface of the third sub-end plate 28 and the outer surface of the fourth sub-end plate 29 (the surface closest to each cell 2 is defined as the inner surface). The screw head passes through the third sub-end plate 28 and connects to the fourth sub-end plate 29. In order for the end plate assembly 24 to function as a whole and better squeeze each cell 2, as shown in FIG. 79, a gasket 244 is provided between the third sub-end plate 28 and the fourth sub-end plate 29 in this embodiment. The screw head passes through the third sub-end plate 28, the gasket 244, and the fourth sub-end plate 29 in sequence to prevent the gap between the third sub-end plate 28 and the fourth sub-end plate 29 from becoming smaller or even disappearing when squeezing the cell 2.

[0820] When fluid replacement is needed, follow these steps:

[0821] Remove the corresponding caps. If elastic sealing columns are provided in the first channel 74511 and the second channel 74211, remove the elastic sealing columns sealed in the first channel 74511 and the second channel 74211.

[0822] When there is gas in the inner cavity of the housing 1, the gas will overflow from the first channel 74511, making it easier to inject liquid into the inner cavity of the housing 1. To ensure smoother liquid injection, in this step, an exhaust pipe can be inserted into the first channel 74511, and an external exhaust device connected to the exhaust pipe can be started to exhaust gas, so that a certain negative pressure is formed in the inner cavity of the housing 1.

[0823] Afterwards, the electrolyte injection tube is extended into the second channel 74211 and the electrolyte is injected. During the injection process, if there is a problem of injection difficulty, the external air extraction device can be activated to form a certain negative pressure in the inner cavity of the housing 1 before the injection is continued;

[0824] After the fluid replenishment is completed, the electrolyte injection tube and the air extraction tube are pulled out; the elastic sealing column is sealed in the first channel 74511 and the second channel 74211, and then the corresponding caps are sealed and fixed on the liquid injection and replacement component body 2421 and the air injection and exhaust component body 7451 respectively.

[0825] When the fluid needs to be changed, follow these steps:

[0826] Remove the corresponding caps and take out the elastic sealing columns sealed in the first channel 74511 and the second channel 74211;

[0827] Insert the electrolyte extraction tube into the second channel 74211 and extract the electrolyte. If the electrolyte cannot be extracted, insert the gas injection tube into the first channel 74511 and inject protective gas into the inner cavity of the housing 1 to extract the electrolyte. After the extraction is completed, remove the electrolyte extraction tube and the gas injection tube, insert the electrolyte injection tube into the second channel 74211, and inject new electrolyte. After the injection is completed, remove the electrolyte injection tube.

[0828] The elastic blocking column is sealed in the second channel 74211 and the first channel 74511, and then the corresponding cap is sealed and fixed on the liquid injection and replacement component body 2421.

[0829] Example 32

[0830] Different from Example 31, as shown in Figures 80 and 81, in this embodiment, a second sub-end plate 243 is arranged between the first sub-end plate 241 and the outermost single battery 2 in the outer shell 1, and the second sub-end plate 243 is tightly attached to the outermost single battery 2 and fixedly connected to the first sub-end plate 241.

[0831] By adding a second sub-end plate 243, the size of the second sub-end plate 243 along the x-direction can be adjusted to clamp all the single cells 2 in the x-direction, thereby improving the stability of each single cell 2 in the inner cavity of the shell 1. It can also prevent each single cell 2 from swelling, which may lead to a decrease in the cycle performance of large-capacity batteries.

[0832] In this embodiment, screws are used to secure the second sub-end plate 243 to the first sub-end plate 241. A gasket 244 can also be placed between the first sub-end plate 241 and the second sub-end plate 243. The screw heads pass through the second sub-end plate 243 and the gasket 244, respectively, to connect to the first sub-end plate 241. The thickness of the gasket 244 (dimension along the x-direction) can also be adjusted to adjust the thickness of the entire end plate assembly 24, thereby clamping all the single cells 2.

[0833] When the second sub-end plate 243 is provided, the package opening device operating port 2413 and the explosion relief port 27 may be the same opening, and the gap between the first sub-end plate 241 and the second sub-end plate 243 serves as the first explosion relief channel 26 .

[0834] Correspondingly, the other end plate assembly 24 (without the gas injection and exhaust component 745 and the liquid injection and replacement component 242) can be a flat plate, which is sealed at the other open end of the first cylinder 23 and at the same time seals the open ends of the electrolyte shared chamber 4 and the gas chamber 9.

[0835] Example 33

[0836] Different from the above embodiment, as shown in Figure 82, in this embodiment, the first blocking member 7452 and the second blocking member 7422 can also include a first hydraulic quick connector mother body 74522 and a second hydraulic quick connector mother body 74222 respectively fixed on the first channel 74511 and the second channel 74211. After the corresponding first cap and the second cap are respectively buckled on the gas injection and exhaust component body 7451 and the fluid injection and exchange component body 2421, the first hydraulic quick connector mother body 74522 and the second hydraulic quick connector mother body 74222 are respectively located in the inner cavity of the first cap and the second cap.

[0837] When fluid replenishment is required, the steps can be similar to those in Example 31, except that:

[0838] Due to the present embodiment, a first hydraulic quick connector mother body 74522 and a second hydraulic quick connector mother body 74222 are respectively provided in the first through hole and the second through hole. After removing the corresponding first cover cap and the second cover cap, the first through hole and the second through hole are still in a sealed state under the sealing of the corresponding first hydraulic quick connector mother body 74522 and the second hydraulic quick connector mother body 74222. In addition, the present embodiment requires the use of an exhaust pipe, an air injection pipe, an electrolyte injection pipe and an electrolyte extraction pipe connected to a hydraulic quick connector sub-body. When exhaust, air injection or liquid injection or extraction is required, the hydraulic quick connector sub-body is inserted into the corresponding mother body, and the corresponding hydraulic quick connector mother body is opened so that the first channel 74511 and the second channel 74211 are connected to the exhaust pipe, the air injection pipe, the electrolyte injection pipe and the electrolyte extraction pipe. After the operation is completed, the hydraulic quick connector sub-body is pulled out, and the corresponding hydraulic quick connector mother body seals the first channel 74511 and the second channel 74211. Finally, the first cap and the second cap are sealed and fixed on the liquid injection and replacement component body 2421 and the gas injection and exhaust component body 7451 respectively.

[0839] Examples 34 to 37 provide a functional component for a lithium-ion battery (i.e., a repair mechanism) and a large-capacity battery having the functional component. Based on the functional component, the lithium-ion battery can be injected and replaced. For ease of understanding, the functional component is defined as an injection and replacement component.

[0840] The lithium-ion battery can be a single cell or a lithium-ion battery module with a housing.

[0841] If it is a single cell battery (including a shell and at least one set of electrode assemblies located inside the shell, and the inner cavity of the shell includes an electrolyte area and a gas area), the liquid injection and replacement component can be fixed at any position of the single cell shell. Preferably, the liquid injection and replacement component is fixed on the original liquid injection port of the single cell to realize the function of injecting or replacing the electrolyte.

[0842] If it is a lithium-ion battery module with a shell (including the shell and at least two single cells located in the shell, the inner cavity of the shell and the inner cavity of the single cells are connected, and the inner cavity of the shell includes an electrolyte area and a gas area, which can also be called a lithium-ion battery pack or a large-capacity battery), the liquid injection and replacement component can also be fixed to any part of the lithium-ion battery module shell. Based on the liquid injection and replacement component, the electrolyte in the inner cavity of the shell can be injected or replaced.

[0843] Specifically, the fluid injection and exchange components of Examples 34 to 37 mainly include a columnar fluid injection and exchange component body; the fluid injection and exchange component body is fixed on the lithium-ion battery shell, and a fifth channel that is connected to the electrolyte area in the inner cavity of the shell is opened on the fluid injection and exchange component body; a first pipe is installed in the fifth channel.

[0844] After the liquid injection and replacement component body is fixed on the lithium-ion battery shell, the free end of the first tube extends to the outside of the shell, and the end of the fifth channel not fixed with the first tube is located inside the shell and communicates with the electrolyte area in the inner cavity of the shell.

[0845] During the charging and discharging operation of the lithium-ion battery, the end of the first tube located outside the shell (i.e., the free end of the above-mentioned first tube) is sealed; when performing the fluid injection and replacement operation, it is necessary to open the end of the first tube located outside the shell, and the fluid injection and replacement operation is carried out based on the first tube and the fifth channel.

[0846] When the lithium-ion battery is charged and discharged for a period of time, the performance is reduced due to the decomposition and consumption of the electrolyte. The end of the first tube located outside the shell can be opened, and the electrolyte can be injected into the inner cavity of the shell through the first tube and the fifth channel to improve the performance of the lithium-ion battery. Or, when the lithium-ion battery is charged and discharged for a period of time, the performance of the lithium-ion battery is affected by impurities in the electrolyte. The electrolyte in the inner cavity of the shell can also be replaced by the liquid injection component to improve the performance of the lithium-ion battery. The replacement here can be a partial replacement or a complete replacement. After completing the injection or liquid replacement operation, the end of the first tube located outside the shell can be sealed. The operation is simple and convenient.

[0847] The following further describes Examples 34 to 37 in conjunction with the accompanying drawings.

[0848] Example 34

[0849] As shown in FIG83 , it is a schematic structural diagram of the fluid injection and replacement component of this embodiment, which includes a fluid injection and replacement component main body 111 .

[0850] The main body 111 of the fluid injection component is used to be fixed to the lithium-ion battery housing. In this embodiment, the main body 111 of the fluid injection component is a cylinder. In other embodiments, rectangular columns, semi-cylinders, etc. can also be used. To facilitate its fixation to the lithium-ion battery housing, this embodiment provides an annular limiting boss 511 on the outer peripheral surface of the main body 111 of the fluid injection component along its circumference. A second mounting hole 1131 is opened in the lithium-ion battery housing, and the main body 111 of the fluid injection component is fixed in the second mounting hole 1131. The annular limiting boss 511 is welded to the area of ​​the housing 1 surrounding the second mounting hole 1131 to achieve fixation while sealing the second mounting hole 1131 (see Figure 90 for details).

[0851] A through hole is opened on the fluid injection component body 111 as the fifth channel 1112. The fifth channel 1112 can be a straight through hole or an L-shaped through hole (as shown in FIG. 84 , the L-shaped through hole is used in this embodiment).

[0852] In this embodiment, the first tube 1113 is sleeved in the fifth channel 1112. After the liquid injection and exchange component main body 111 is fixed on the lithium-ion battery shell, the free end 11131 of the first tube is located outside the shell 1, and the end of the fifth channel 1112 to which the first tube 1113 is not fixed (the port shown as 1112a in Figure 84) is located inside the shell 1 and is connected to the electrolyte area in the inner cavity of the shell 1.

[0853] During the charge and discharge operation of the lithium-ion battery, the free end 11131 of the first tube is sealed; when performing a fluid injection operation, the free end 11131 of the first tube needs to be opened, and the fluid injection operation is performed based on the first tube 1113 and the fifth channel 1112.

[0854] In this embodiment, the first tube 1113 is made of PP (polypropylene) material that does not react with the electrolyte, and the free end 11131 of the first tube is sealed by heat shrink extrusion.

[0855] In some other embodiments, the first tube 1113 may also be made of other materials such as plastic or rubber that do not react with the electrolyte.

[0856] In some other embodiments, the first tube 1113 can also be made of other hard materials that do not react with the electrolyte, such as metal materials such as aluminum and copper. Correspondingly, a sealing plug or sealing cover can be fixed at the free end 11131 of the first tube for sealing.

[0857] In order to further improve the stability of the first tube fitting 1113 on the fluid injection and exchange component body 111, and at the same time ensure the sealing between the first tube fitting 1113 and the fifth channel 1112, as shown in Figure 84, in this embodiment, the fifth channel is designed as a stepped through hole opened along the fluid injection and exchange component body; sealant is poured on the stepped surface of the fifth channel, and a sealant layer 1115 is formed after solidification. This sealant layer can not only fix the first tube fitting 1113, but also seal the gap between the first tube fitting 1113 and the fifth channel 1112.

[0858] It should be noted that the free end 11131 of the first pipe needs to extend out of the sealant layer 1115 .

[0859] In order to enable more thorough liquid replacement, as shown in FIG85 , in this embodiment, an electrolyte connecting tube 1013 is connected to one end of the fifth channel 1112 located inside the shell, and the fifth channel 1112 is connected to the electrolyte area in the inner cavity of the shell through the electrolyte connecting tube 1013 .

[0860] One end of the electrolyte connecting tube 1013 is fixed on the liquid injection and replacement component body 111 and communicates with the fifth channel 1112; the other end is used to communicate with the electrolyte area in the inner cavity of the shell.

[0861] It should be noted that the end of the electrolyte connecting tube 1013 connected to the electrolyte area in the inner cavity of the shell can be directly extended into the bottom of the inner cavity of the shell and is always immersed in the electrolyte. When the liquid needs to be changed, as much electrolyte as possible in the inner cavity of the shell can be extracted, so that the liquid change is more thorough.

[0862] The electrolyte connecting tube 1013 and the main body 111 of the liquid injection component can be an integral part or a separate part. When it is a separate part, it can be connected to the main body 111 of the liquid injection component by welding or screwing. The material of the electrolyte connecting tube 1013 is generally the same aluminum material as the main body 111 of the liquid injection component.

[0863] As shown in Figure 86, it is a structural schematic diagram of a lithium-ion battery of this embodiment, specifically a large-capacity battery, including a shell 1 and a plurality of single cells 2 arranged in the shell 1.

[0864] The single cells 2 in this embodiment are prismatic cells, numbering 13. Each single cell 2 has an inner cavity comprising an electrolyte region and a gas region. In other embodiments, the number of single cells 2 can be adjusted based on actual needs, and the shape of the single cells 2 can also be adjusted based on actual needs.

[0865] A rectangular housing 1 is usually used. For ease of description, the length direction of the housing 1 is defined as the x direction, the width direction of the housing 1 is defined as the y direction, and the height direction of the housing 1 is defined as the z direction.

[0866] Examples 34 to 37 do not specifically limit the structure of the housing 1, and at least the following two structures can be used:

[0867] The first structure includes a first cylinder with open ends at both ends (i.e., the end parallel to the yz plane is the open end) and end plates respectively fixed to the two open ends of the first cylinder (i.e., the end plates are parallel to the yz plane);

[0868] The second structure includes a second cylinder with open ends at the top and bottom (i.e., the ports parallel to the xy plane are open ends) and an upper cover plate and a lower cover plate respectively fixed to the open ends of the top and bottom of the second cylinder (i.e., the upper cover plate and the lower cover plate are parallel to the xy plane).

[0869] In the following description, the cover plates in the housing 1 that are parallel to the xy plane are respectively defined as the housing top plate 12 and the housing bottom plate 11 , and the cover plate that is parallel to the yz plane is referred to as the end plate 1033 .

[0870] The inner cavity of the housing 1 is connected to the inner cavities of all the single cells 2. Preferably, a shared cavity can be provided in the housing 1 so that the inner cavity of the shared cavity is connected to the inner cavities of all the single cells 2 to achieve the above-mentioned connection effect.

[0871] It should be noted that:

[0872] The shared chamber can be an electrolyte shared chamber 4 (see FIG87 ). This shared electrolyte chamber 4 allows each cell 2 to be exposed to a uniform electrolyte environment, ensuring electrolyte uniformity within each cell 2 and improving the performance and charge-discharge cycle life of large-capacity batteries. The electrolyte shared chamber 4 is a liquid channel extending along the length (x-direction) of the housing 1 between the housing bottom plate 11 and each cell 2. This liquid channel can be integrally formed with the housing bottom plate 11 or formed by providing a support member 1034 between the lower cover plate of the cell 2 and the housing bottom plate 11.

[0873] A gas-sharing chamber 9 (see FIG87 ) is provided along the x-direction on the housing top plate 12. The interior of the gas-sharing chamber 9 communicates with the gas areas within each cell 2. Gas-sharing chamber 9 achieves gas balance within each cell 2, thereby improving the performance and charge-discharge cycle life of high-capacity batteries.

[0874] In some other embodiments, only the electrolyte sharing chamber 4 may be provided.

[0875] In order to improve the heat dissipation performance of such large-capacity batteries, an avoidance hole can be opened on the outer shell top plate 12 to allow the polarity terminals of each single battery 2 to extend out; the polarity terminals of each single battery 2 extend out of the avoidance hole and the outer shell top plate 12 area around the avoidance hole is fixedly sealed with the shell of the single battery 2.

[0876] It should be noted that the polarity terminal of the single cell battery 2 described here can be a pole of the single cell battery 2. If, in order to avoid the single cell battery 2 pole being unable to smoothly extend out of the avoidance hole as a polarity terminal or the extension height not meeting the set requirements, a pole adapter can also be connected to the single cell battery 2 pole, and the overall structure of the single cell battery 2 pole and the pole adapter can be used as the polarity terminal of the single cell battery 2.

[0877] In order to further improve the heat dissipation performance of the large-capacity battery in the above embodiment, as shown in FIG88 , the large-capacity battery in this embodiment further includes a heat transfer tube 105 .

[0878] This embodiment features a heat ...

Claims

1. A large-capacity battery assembly, characterized in that: Including large capacity battery and repair mechanism; The large-capacity battery comprises a shell and m single cells arranged in the shell, m>1; the inner cavity of each single cell comprises an electrolyte area and a gas area; the shell is provided with an electrolyte sharing chamber; the electrolyte sharing chamber is connected with the electrolyte area of ​​each single cell inner cavity; the top plate of the shell is provided with an avoidance hole through which each single cell pole can be extended; each single cell pole extends out of the avoidance hole on the top plate of the shell, and the shell area corresponding to the avoidance hole is fixedly sealed with the shell of the single cell; The repair mechanism is connected to the large-capacity battery and is used to repair the large-capacity battery after capacity decay or to suppress the decay rate of the large-capacity battery, so as to improve the performance and cycle life of the large-capacity battery.

2. The large-capacity battery assembly according to claim 1, characterized in that: The repair mechanism includes a cleaning component, which is located between the bottom plate of the housing and the bottom of each single battery and is used to remove impurities in the electrolyte; The impurity-removing component is a hollow structure, the inner cavity of which is filled with impurity-removing material, and a second through hole is provided on the impurity-removing component, which penetrates the inner cavity and allows the electrolyte to pass through.

3. The large-capacity battery assembly according to claim 2, characterized in that: There are two impurity removal components; the two impurity removal components are respectively located on both sides of the electrolyte shared chamber and extend along the length direction of the shell.

4. The large-capacity battery assembly according to claim 3, characterized in that: The impurity-removing component is a hollow box with a rectangular cross-section.

5. The large-capacity battery assembly according to claim 4, characterized in that: In the y direction, the size of the impurity removal component is equal to the size of the bottom plate area of ​​the shell on both sides of the electrolyte sharing chamber.

6. The large-capacity battery assembly according to claim 5, characterized in that: The inner surface of the bottom plate of the shell is provided with a limiting guide boss extending along the x direction; the impurity removal component is located between the limiting guide boss and the side wall of the shell.

7. The large-capacity battery assembly according to claim 6, characterized in that: The length direction of the impurity removing component is defined as the x direction, the width direction is defined as the y direction, and the height direction is defined as the z direction; there are a plurality of the second through holes, which are evenly distributed on at least one side wall of the impurity removing component parallel to the xz plane.

8. The large-capacity battery assembly according to claim 7, characterized in that: The repair mechanism also includes a magnetic stirring device; the magnetic stirring device includes a magnet and a magnetic stirrer; the magnet is located in the electrolyte shared chamber, and the magnetic stirring device is arranged outside the shell to drive the magnet to rotate and stir the electrolyte.

9. The large-capacity battery assembly according to any one of claims 1 to 7, characterized in that: The top plate of the housing has a protrusion in a direction away from the bottom plate of the housing, which serves as a gas chamber, and the gas chamber covers the gas ports of each single battery.

10. The large-capacity battery assembly according to claim 9, characterized in that: The impurity-removing material is at least one of 4A molecular sieve, lithiated molecular sieve or α-alumina.

11. The large-capacity battery assembly according to claim 10, characterized in that: The impurity-removing material is lithiated molecular sieve and alpha-alumina, wherein the mass ratio of the lithiated molecular sieve to the alpha-alumina is 1:1, and the mass percentage of the impurity-removing material in the electrolyte is 3% to 10%.

12. The large-capacity battery assembly according to any one of claims 1 to 7, characterized in that: The repair mechanism includes a liquid injection and replacement component; the liquid injection and replacement component is used to add electrolyte to the electrolyte shared chamber and the inner cavity of each single battery, or to replace the electrolyte in the electrolyte shared chamber and the inner cavity of each single battery.

13. The large-capacity battery assembly according to claim 12, characterized in that: The shell includes a first cylinder with open ends at both ends and end plate assemblies respectively fixed to the two open ends of the first cylinder; the avoidance hole is opened on the top plate of the first cylinder; the electrolyte sharing chamber is located on the bottom plate of the first cylinder; and the liquid injection and replacement component is located on at least one end plate assembly.

14. The large-capacity battery assembly according to claim 13, characterized in that: The end plate assembly provided with a fluid injection and exchange component includes a first sub-end plate; an electrolyte circulation channel is arranged on the first sub-end plate; the fluid injection and exchange component is located on the first sub-end plate; the fluid injection and exchange component includes a fluid injection and exchange component body and a sealing component; a first channel is opened on the fluid injection and exchange component body for communicating with the electrolyte circulation channel; the sealing component is used to block the electrolyte circulation channel.

15. The large-capacity battery assembly according to claim 14, characterized in that: The top plate of the first cylinder is provided with a gas chamber; the gas chamber is communicated with the gas area of ​​the inner cavity of each single battery.

16. The large-capacity battery assembly according to claim 15, characterized in that: The first sub-end plate is also provided with a gas flow channel connected with the gas chamber; a second channel is provided on the main body of the liquid injection and replacement component for connecting with the gas flow channel; and the blocking member is also used for blocking the gas flow channel.

17. The large-capacity battery assembly according to claim 16, characterized in that: The main body of the liquid injection and replacement component is a column, and the first channel and the second channel are both first through holes opened on the main body of the liquid injection and replacement component.

18. The large-capacity battery assembly according to claim 17, characterized in that: The blocking piece comprises a cap buckled on the main body of the liquid injection and replacement component.

19. The large-capacity battery assembly according to claim 18, characterized in that: The blocking member also includes an elastic blocking column sealed in the first channel and the second channel.

20. The large-capacity battery assembly according to claim 18, characterized in that: The plugging member also includes a sealing plate and a first hot melt member; a step hole is opened on the liquid injection component; the step hole is connected with the first channel and the second channel; the sealing plate is fixed on the step surface of the step hole, and the first hot melt member is fixed on the sealing plate and in the step hole where the sealing plate is located.

21. The large-capacity battery assembly according to claim 16, characterized in that: The main body of the liquid injection and replacement component includes an annular fixed part and a rotating part; the rotating part is coaxially located in the annular fixed part and has a clearance fit with the annular fixed part, and can rotate in the annular fixed part under the action of external force; The first channel and the second channel are both third through holes formed on the rotating member; in the first state, the first channel and the electrolyte flow channel are isolated, and the second channel and the gas flow channel are isolated by rotating the rotating member; in the second state, the first channel and the electrolyte flow channel are connected, and the second channel and the gas flow channel are connected by rotating the rotating member; the first state is: a normal charge and discharge cycle state of a large-capacity battery; the second state is: a state in which electrolyte is replenished into the electrolyte shared chamber and the inner cavity of each single cell by a liquid injection component, or the electrolyte in the electrolyte shared chamber and the inner cavity of each single cell is replaced.

22. The large-capacity battery assembly according to claim 21, characterized in that: The annular fixing member and the rotating member are respectively provided with a first positioning mark and a second positioning mark. When the first positioning mark and the second positioning mark reach the set position, the first channel is connected with the electrolyte flow channel, and the second channel is connected with the gas flow channel.

23. The large-capacity battery assembly according to claim 16, characterized in that: The main body of the liquid injection and replacement component includes an annular fixed part and a rotating part; the rotating part is coaxially located in the annular fixed part and has a clearance fit with the annular fixed part, and can rotate in the annular fixed part under the action of external force; The first channel and the second channel are the same channel, which is the same fourth through hole opened on the rotating part; in the first state, by rotating the rotating part, the fourth through hole and the electrolyte flow channel and the gas flow channel are isolated; in the second state, by rotating the rotating part, the fourth through hole and the electrolyte flow channel or the gas flow channel are connected; the first state is: the normal charge and discharge cycle state of the large-capacity battery; the second state is: the state of replenishing electrolyte into the electrolyte shared chamber and the inner cavity of each single cell through the liquid injection component, or replacing the electrolyte in the electrolyte shared chamber and the inner cavity of each single cell.

24. The large-capacity battery assembly according to claim 23, characterized in that: The annular fixing member is provided with a first identifier and a second identifier; the rotating member is provided with a third identifier, the third identifier and the first identifier reach a set position, the fourth through hole is connected to the electrolyte flow channel, the third identifier and the second identifier reach a set position, and the fourth through hole is connected to the gas flow channel.

25. The large-capacity battery assembly according to claim 16, characterized in that: The first sub-end plate is provided with an operating port for an unpacking device, which is connected with one end of the electrolyte shared chamber. Under normal charge and discharge cycle conditions of the large-capacity battery, the operating port for the unpacking device is sealed by a seal. A first explosion relief channel and an explosion relief port are provided on the other end plate assembly. Both ends of the first explosion relief channel are respectively connected with the gas chamber and the explosion relief port, and an explosion relief mechanism is sealed at the explosion relief port.

26. The large-capacity battery assembly according to claim 16, characterized in that: The end plate assembly provided with the liquid injection and replacement component also includes a second sub-end plate; the second sub-end plate is tightly attached to the outermost single battery cell in the housing and is fixedly connected to the first sub-end plate.

27. The large-capacity battery assembly according to claim 26, characterized in that: The second sub-end plate is fixedly connected to the first sub-end plate by screws; a gasket is provided between the second sub-end plate and the first end plate, and the screw head passes through the second sub-end plate and the gasket in sequence to be connected to the first sub-end plate.

28. The large-capacity battery assembly according to claim 27, characterized in that: An opening is also provided on the first sub-end plate of the end plate assembly provided with the liquid injection and replacement component, which serves as an operating port for the package opening device and an explosion vent, and is connected to the electrolyte shared chamber; the gap between the first sub-end plate and the second sub-end plate serves as a first explosion vent channel, and the two ends of the first explosion vent channel are respectively connected to the gas chamber and the explosion vent, and an explosion vent mechanism is sealed at the explosion vent.

29. The large-capacity battery assembly according to claim 1, characterized in that: The length direction of the shell is defined as the x direction, the width direction is defined as the y direction, and the height direction is defined as the z direction; the shell includes a second cylinder and a shell top plate and a shell bottom plate covering an open end of the second cylinder, and the shell top plate and the shell bottom plate are parallel to the xy plane; The electrolyte sharing chamber is arranged on the bottom plate of the housing; The repair mechanism includes a liquid injection component, which is arranged on at least one first side wall of the second cylinder, wherein the first side wall is The side walls are parallel to the yz plane; the liquid filling and replacement component is used to add electrolyte to the electrolyte shared chamber and the inner cavity of each single battery, or to replace the electrolyte in the electrolyte shared chamber and the inner cavity of each single battery.

30. The large-capacity battery assembly according to claim 29, characterized in that: An electrolyte flow channel is provided on the first side wall; the liquid injection component includes a liquid injection component body and a blocking member fixed on the liquid injection component body; a first channel is opened on the liquid injection component body; The two ends of the electrolyte circulation channel are respectively connected with the electrolyte sharing chamber and the first channel of the liquid injection and replacement component; the blocking member is used to block the first channel from the outside of the first side wall.

31. The large-capacity battery assembly according to claim 30, characterized in that: The first side wall is provided with a cavity isolated from the electrolyte flow channel.

32. The large-capacity battery assembly according to claim 31, characterized in that: On the first side wall, along the x direction, a first blind hole is opened through the first side wall as a mounting hole for the liquid injection and exchange component body; on the first side wall, along the z direction, a second hole is opened through the first side wall as an electrolyte circulation channel; the liquid injection and exchange component body is a column, fixed in the first blind hole, and the first blind hole is sealed; the first channel is opened on the liquid injection and exchange component body and is connected to the electrolyte circulation channel.

33. The large-capacity battery assembly according to claim 32, characterized in that: The top plate of the outer shell is provided with a gas chamber; the gas chamber is communicated with the gas area of ​​the inner cavity of each single battery.

34. The large-capacity battery assembly according to claim 33, characterized in that: The first side wall is also provided with a gas circulation channel connected to the gas chamber; a second channel is provided on the main body of the liquid injection and exchange component, and the second channel is isolated from the first channel; the two ends of the gas circulation channel are respectively connected to the gas chamber and the second channel of the liquid injection and exchange component; the sealing member is also used to block the second channel from the outside of the first side wall.

35. The large-capacity battery assembly according to claim 34, characterized in that: The second channel is an L-shaped channel, including a horizontal channel and a vertical channel, wherein the longitudinal cross-section of the horizontal channel is a fan-shaped channel.

36. The large-capacity battery assembly according to claim 34, characterized in that: The second channel includes a horizontal channel and a vertical channel that are interconnected, wherein the horizontal channel is a plurality of through holes that are connected to the vertical channel, and the plurality of through holes are arranged along the same circumference.

37. The large-capacity battery assembly according to claim 34, characterized in that: The blocking piece comprises a cap which is threadedly connected to the main body of the liquid injection and replacement component.

38. The large-capacity battery assembly according to claim 37, characterized in that: The fluid injection and replacement component also includes a hollow component coaxially arranged at the end of the fluid injection and replacement component body and extending along the x direction; the sealing component also includes a first rubber ring and a second hot melt component; the first rubber ring is coaxially fixed in the hollow component, and the second hot melt component is fixed in the first rubber ring by hot melting and blocks the first channel and the second channel.

39. The large-capacity battery assembly according to claim 1, characterized in that: The repair mechanism includes a fluid injection and replacement component, which includes a fluid injection and replacement component body, an electrolyte circulation pipe section and a blocking member; the fluid injection and replacement component body is fixed on the outer shell, and a first channel communicating with the inner cavity of the outer shell is opened on the fluid injection and replacement component body; one end of the electrolyte circulation pipe section is fixed on the fluid injection and replacement component body and communicates with the first channel; the other end of the electrolyte circulation pipe section is communicated with the electrolyte area of ​​the inner cavity of the outer shell; the blocking member blocks the first channel from the outside of the outer shell.

40. The large-capacity battery assembly according to claim 39, characterized in that: The main body of the liquid injection and replacement component is also provided with a second channel which is in communication with the gas area in the inner cavity of the shell; and the blocking member is also used to block the second channel from the outside of the shell.

41. The large-capacity battery assembly according to claim 40, characterized in that: The main body of the liquid injection and replacement component is a cylinder, and the first channel and the second channel are through holes opened on the main body of the liquid injection and replacement component.

42. The large-capacity battery assembly according to claim 41, characterized in that: An annular limiting boss is provided on the outer peripheral surface of the main body of the liquid injection and replacement component along the circumference direction thereof, and is used to cooperate with the shell to achieve the fixation of the main body of the liquid injection and replacement component.

43. The large-capacity battery assembly according to claim 41, characterized in that: The second channel is opened along the axial direction of the liquid injection and replacement component body, and its longitudinal cross section is a fan ring.

44. The large-capacity battery assembly according to claim 41, characterized in that: The second channel includes a plurality of through holes opened along the axial direction of the main body of the liquid injection and replacement component, and the plurality of through holes are arranged along the same circumference.

45. The large-capacity battery assembly according to any one of claims 40 to 44, characterized in that: The sealing member includes a first rubber ring and a second hot melt member; a countersunk hole that penetrates the first channel and the second channel is opened axially along the main body of the liquid injection and replacement component; the first rubber ring is coaxially fixed in the countersunk hole, and the second hot melt member is fixed in the first rubber ring by hot melting and seals the first channel and the second channel.

46. ​​The large-capacity battery assembly according to claim 45, characterized in that: The blocking member also includes a cap buckled on one end of the fluid injection and replacement component body, wherein the one end of the fluid injection and replacement component body is an end of the fluid injection and replacement component body located outside the shell.

47. The large-capacity battery assembly according to claim 39, characterized in that: The top plate of the outer shell is provided with a gas chamber; the gas chamber is communicated with the gas area of ​​the inner cavity of each single battery; and the second channel is communicated with the gas chamber.

48. The large-capacity battery assembly according to claim 47, characterized in that: A mounting hole is provided on the shell, a main body of the liquid injection and replacement component is coaxially located in the mounting hole, and the annular limiting boss is sealed and welded to the peripheral area of ​​the mounting hole.

49. The large-capacity battery assembly according to claim 1, characterized in that: The repair mechanism includes a fluid injection component, which includes a fluid injection component body and a plugging component; the fluid injection component body is fixed to the shell, and a first channel that is connected to the inner cavity of the shell is opened on the fluid injection component body; the plugging component includes a first rubber ring and a first sealing plate; the first rubber ring is coaxially fixed in the first channel, and the first sealing plate is fixed to the first end face of the first rubber ring by hot melting, and blocks the first channel; The first end face of the first rubber ring is the end face of the first rubber ring away from the lithium-ion battery housing.

50. The large-capacity battery assembly according to claim 49, characterized in that: The liquid injection and replacement component also includes an electrolyte circulation pipe section; one end of the electrolyte circulation pipe section is fixed on the liquid injection and replacement component body and is connected to the first channel; the other end of the electrolyte circulation pipe section is connected to the electrolyte area of ​​the inner cavity of the shell.

51. The large-capacity battery assembly according to claim 50, characterized in that: A second channel communicating with the gas zone in the inner cavity of the shell is also provided on the main body of the fluid injection and exchange component; the first channel is a stepped through hole provided along the main body of the fluid injection and exchange component; the second channel is isolated from the small hole of the stepped through hole and communicates with the large hole of the stepped through hole; the first rubber ring is coaxially fixed in the large hole of the stepped through hole.

52. The large-capacity battery assembly according to claim 51, characterized in that: The axial length of the first rubber ring is greater than the axial length of the large hole of the step through hole; one end of the first rubber ring is in close contact with the step surface of the step through hole, and the outer side of the other end is provided with an annular folded edge along its circumference, and the annular folded edge is in close contact with the end surface of the large hole of the step through hole.

53. The large-capacity battery assembly according to claim 51, characterized in that: The second channel is opened along the axial direction of the liquid injection and replacement component body, and its longitudinal cross section is a fan ring.

54. The large-capacity battery assembly according to claim 51, characterized in that: The second channel includes a plurality of through holes opened along the axial direction of the main body of the liquid injection and replacement component, and the plurality of through holes are arranged along the same circumference.

55. The large-capacity battery assembly according to any one of claims 49 to 54, characterized in that: The blocking member also includes a cap buckled on one end of the fluid injection and replacement component body, wherein the one end of the fluid injection and replacement component body is an end of the fluid injection and replacement component body located outside the shell.

56. The large-capacity battery assembly according to claim 55, characterized in that: The sealing member also includes a sealing column fixed in the first rubber ring by hot melting.

57. The large-capacity battery assembly according to claim 49, characterized in that: An annular limiting boss is provided on the outer peripheral surface of the main body of the liquid injection and replacement component along the circumference direction thereof, and is used to cooperate with the shell to achieve the fixation of the main body of the liquid injection and replacement component.

58. The large-capacity battery assembly according to claim 51, characterized in that: The shared chamber is a gas chamber, which is connected to the gas area of ​​the inner cavity of each single battery; the second channel is connected to the gas chamber.

59. The large-capacity battery assembly according to claim 1, characterized in that: The housing is also provided with a gas chamber; the gas chamber is connected to the gas area of ​​the inner cavity of each single battery; the repair mechanism includes a gas injection and exhaust component and a liquid injection and replacement component; The gas injection and exhaust components are used to achieve gas replenishment or exhaust of the gas chamber and the inner cavity of each single cell; the liquid injection and replacement components are used to add electrolyte to the electrolyte shared chamber and the inner cavity of each single cell, or to replace the electrolyte in the electrolyte shared chamber and the inner cavity of each single cell.

60. The large-capacity battery assembly according to claim 59, characterized in that: The outer shell includes a first cylinder with open ends at both ends and end plate assemblies respectively fixed to the two open ends of the first cylinder; the avoidance hole is opened on the top plate of the first cylinder; the electrolyte sharing chamber is located on the bottom plate of the first cylinder; the gas chamber is located on the top plate of the first cylinder; the gas injection and exhaust components and the liquid injection and replacement components are located on the end plate assembly.

61. The large-capacity battery assembly according to claim 60, characterized in that: The end plate assembly provided with gas injection and exhaust components and liquid injection and replacement components comprises a first sub-end plate; a gas flow channel and an electrolyte flow channel are provided on the first sub-end plate; the gas injection and exhaust components and the liquid injection and replacement components are provided on the outer surface of the first sub-end plate; The gas injection and exhaust component comprises a gas injection and exhaust component body and a first blocking member fixed on the gas injection and exhaust component body; a first channel is opened on the gas injection and exhaust component body, and the first blocking member is used to block the first channel from the outer surface side of the first sub-end plate; two ends of the gas flow channel are respectively connected to the gas chamber and the first channel of the gas injection and exhaust component; The liquid injection and replacement component includes a liquid injection and replacement component body and a second blocking member fixed on the liquid injection and replacement component body; the liquid injection and replacement component body is provided with a second channel, and the second blocking member is used to block the second channel from the outer surface side of the first sub-end plate; Both ends of the electrolyte flow channel are communicated with the electrolyte sharing chamber and the second channel of the liquid injection and replacement component respectively.

62. The large-capacity battery assembly according to claim 61, characterized in that: The main body of the gas injection and exhaust component is a column, and the first channel is a through hole axially opened on the main body of the gas injection and exhaust component; the first blocking piece is a first cap buckled on the main body of the gas injection and exhaust component; the main body of the liquid injection and exchange component is a column, and the second channel is a through hole axially opened on the main body of the liquid injection and exchange component; the second blocking piece is a second cap buckled on the main body of the liquid injection and exchange component.

63. The large-capacity battery assembly according to claim 62, characterized in that: The first blocking member also includes a first hydraulic quick connector body sealed in the first channel; the second blocking member also includes a second hydraulic quick connector body sealed in the second channel.

64. The large-capacity battery assembly according to claim 61, characterized in that: The first sub-end plate is provided with an operating port for the package opening device; the other end plate assembly is provided with a first explosion relief channel and an explosion relief port, the two ends of the first explosion relief channel are respectively connected with the gas chamber and the explosion relief port, and an explosion relief mechanism is sealed at the explosion relief port.

65. The large-capacity battery assembly according to claim 61, characterized in that: The end plate assembly provided with gas injection and exhaust components and liquid injection and replacement components also includes a second sub-end plate; the second sub-end plate is tightly attached to the outermost single battery in the housing and is fixedly connected to the first sub-end plate.

66. The large-capacity battery assembly according to claim 65, characterized in that: The second sub-end plate is fixedly connected to the first sub-end plate by screws; a gasket is provided between the second sub-end plate and the first end plate, and the screw head passes through the second sub-end plate and the gasket in sequence to be connected to the first sub-end plate.

67. The large-capacity battery assembly according to claim 65, characterized in that: An opening is also provided on the first sub-end plate of the end plate assembly provided with a gas injection and exhaust component and a liquid injection and replacement component, serving as an operating port for the package opening device and an explosion relief port; the gap between the first sub-end plate and the second sub-end plate serves as a first explosion relief channel, and both ends of the first explosion relief channel are respectively connected to the gas chamber and the explosion relief port, and an explosion relief mechanism is sealed at the explosion relief port.

68. The large capacity battery assembly according to claim 1, characterized in that: The repair mechanism includes a liquid injection component; the liquid injection component includes a columnar liquid injection component body; the liquid injection component body is fixed to the shell, and a fifth channel is opened on the liquid injection component body and communicates with the electrolyte area of ​​the inner cavity of the shell, and a first pipe is sleeved in the fifth channel; The end of the first tube located outside the housing is sealed.

69. The large-capacity battery assembly according to claim 68, characterized in that: The main body of the liquid injection and replacement component is provided with a sixth channel which is communicated with the gas area in the inner cavity of the shell. The second pipe is sleeved in the sixth channel. The end of the second pipe located outside the shell is sealed.

70. The large-capacity battery assembly according to claim 69, characterized in that: The first pipe and the second pipe are made of plastic pipes that do not react with the electrolyte, and the ends located outside the shell are sealed by heat shrink extrusion sealing.

71. The large-capacity battery assembly according to claim 70, characterized in that: The injection and replacement component also includes a sealing rubber plug; the fifth channel is a step through hole opened along the main body of the injection and replacement component; the sixth channel is isolated from the small hole of the step through hole and is connected to the large hole of the step through hole; The ends of the first pipe fitting and the second pipe fitting located outside the shell are located in the large hole of the step through hole; the sealing rubber plug is inserted into the large hole of the step through hole to seal the fifth channel and the sixth channel.

72. The large-capacity battery assembly according to claim 71, characterized in that: A sealing rubber layer is arranged on the step surface of the fifth channel, and ends of the first pipe member and the second pipe member located outside the shell extend out of the sealing rubber layer.

73. The large-capacity battery assembly according to claim 71, characterized in that: The liquid injection and replacement component also includes a sealing end cover; the sealing end cover is detachably fixed to the liquid injection and replacement component body to reseal the fifth channel and the sixth channel.

74. The large-capacity battery assembly according to claim 1, characterized in that: The repair mechanism comprises a fluid injection component; the fluid injection component comprises a fluid injection component body and a blocking member; The main body of the liquid injection and replacement component is columnar and is used to be fixed on the shell, and a seventh channel that is connected to the electrolyte area of ​​the inner cavity of the shell is opened on the main body of the liquid injection and replacement component; the blocking member includes n groups of sealing units, wherein n is an integer greater than or equal to 1; when n is equal to 1, the sealing unit is arranged in the seventh channel to seal the seventh channel; when n is greater than 1, the n groups of sealing units are stacked in sequence in the seventh channel along the axial direction of the seventh channel to seal the seventh channel; Each group of sealing units includes a first sealing plug and a sealing coating which are stacked in sequence along the axial direction of the seventh channel. The first sealing plug is located on a side close to the inner cavity of the shell, and the sealing coating is located on a side away from the inner cavity of the shell.

75. The large-capacity battery assembly according to claim 74, characterized in that: An annular groove is provided on the inner wall of the seventh channel along its circumference; a limit ring is installed in the annular groove; the end face of the outermost sealing unit in the seventh channel abuts against the limit ring, and the limit ring limits the axial movement of n groups of sealing units in the seventh channel; wherein the outermost sealing unit in the seventh channel is the sealing unit that is farthest from the inner cavity of the shell in the axial direction of the seventh channel.

76. The large-capacity battery assembly according to claim 75, characterized in that: The blocking member also includes a second sealing plug; the second sealing plug is stacked along the axial direction of the seventh channel on the outside of the outermost sealing unit, and the end surface of the second sealing plug abuts against the limit retaining ring.

77. A large capacity battery assembly according to any one of claims 74 to 76, characterized in that: An eighth channel communicating with the gas zone in the inner cavity of the shell is provided on the main body of the fluid injection and exchange component; the seventh channel is a stepped through hole provided along the main body of the fluid injection and exchange component; the eighth channel is isolated from the small hole of the stepped through hole and communicated with the large hole of the stepped through hole; and the blocking member is arranged in the large hole of the stepped through hole.

78. The large-capacity battery assembly according to claim 77, characterized in that: The large hole of the step through hole is a tapered hole, and the small end of the tapered hole is close to the small hole of the step through hole.

79. The large-capacity battery assembly according to claim 77, characterized in that: The liquid injection and replacement component also includes an electrolyte connecting pipe section; one end of the electrolyte connecting pipe section is fixed on the liquid injection and replacement component body and is connected with the seventh channel; the other end of the electrolyte connecting pipe section is used to communicate with the electrolyte area in the inner cavity of the shell.

80. The large-capacity battery assembly according to claim 77, characterized in that: The sealing coating adopts sealing paint which does not react with the electrolyte.

81. The large-capacity battery assembly according to claim 1, characterized in that: The top of the housing is provided with a gas chamber, and each single cell realizes the interconnection of the gas areas of each single cell through the gas chamber; the gas chamber is provided with a first opening communicating with the inner cavity of the gas chamber; the electrolyte shared chamber is provided with a second opening communicating with the inner cavity of the electrolyte shared chamber; The repair mechanism includes a fluid injection and replacement mechanism, which includes a first one-way valve and a second one-way valve; the first one-way valve is arranged on the first opening, and the second one-way valve is arranged on the second opening, and the first one-way valve and the second one-way valve have the same structure.

82. The large-capacity battery assembly according to claim 81, characterized in that: The first one-way valve comprises a fixing sleeve, a sealing sleeve and a sealing assembly; the fixing sleeve is mounted on the first opening and is sealed with the first opening; the sealing sleeve is mounted in the fixing sleeve, and a spring limiting plate is provided at one end of the inner cavity of the sealing sleeve, and a positioning plate is provided at the other end, and the spring limiting plate and the positioning plate are both hollow plates; The sealing assembly includes a third sealing plate, a sealing column and a compression spring. The sealing column is arranged in the sealing sleeve, and its two ends respectively pass through the spring limit plate and the positioning plate. A spring baffle is provided on the sealing column. The compression spring is sleeved on the sealing column and is located between the spring limit plate and the spring baffle. The third sealing plate is arranged at one end of the sealing column passing through the spring limit plate. The third sealing plate can seal the port of the sealing sleeve under the action of the compression spring; one end of the sealing column passes through the positioning plate and extends to the outside of the sealing sleeve.

83. The large-capacity battery assembly according to claim 82, characterized in that: The inner wall of the fixing sleeve is provided with a first step hole, the outer wall of the sealing sleeve is provided with an annular boss, and the annular boss of the sealing sleeve is matched with the step surface of the first step hole for positioning.

84. The large-capacity battery assembly according to claim 82, characterized in that: It also includes a pressure relief valve, which is connected to the second one-way valve, and includes an opening component and a pressure relief component; the pressure relief component includes an outer pipe section and a pressure relief membrane arranged in the outer pipe section; the outer pipe section is used to be connected to the fixed sleeve; The opening component includes an inner pipe section and a top pressure plate. The inner pipe section is nested in the outer pipe section and is located at the end of the outer pipe section away from the pressure relief membrane. The top pressure plate is a hollow plate, which is fixed in the inner pipe section. When the pressure relief valve is connected to the second one-way valve, it presses the sealing column to open the second one-way valve so that the inner cavity of the pressure relief valve is connected to the inner cavity of the electrolyte sharing chamber.

85. The large-capacity battery assembly according to claim 84, characterized in that: The outer pipe section and the fixing sleeve are connected through a tapered pipe thread, and thread sealant is coated between the connecting threads.

86. The large-capacity battery assembly according to claim 85, characterized in that: A first sealing ring is arranged between the outer wall of the inner pipe section and the inner wall of the fixing sleeve.

87. The large-capacity battery assembly according to claim 84, characterized in that: An annular clamping platform is arranged on the inner wall of the outer tube section, and an annular step is arranged on the outer wall of the inner tube section. The annular clamping platform of the outer tube section axially positions the annular step of the inner tube section so that the outer tube section drives the inner tube section to move axially.

88. A large capacity battery assembly according to any one of claims 80 to 87, characterized in that: It also includes a plugging cap, which is connected to the first one-way valve and is a circular sealing cover with one end open, and is used to seal the first opening.

89. The large-capacity battery assembly according to claim 88, characterized in that: The plugging cap is connected to the first one-way valve through a conical pipe thread, and thread sealant is coated between the connecting threads.

90. The large-capacity battery assembly according to any one of claims 80 to 82, characterized in that: It also includes two plugging caps, which are respectively connected to the first one-way valve and the second one-way valve. The plugging cap is a circular sealing cover with one end open, which is used to achieve sealing of the first opening and the second opening.

91. The large-capacity battery assembly according to claim 1, characterized in that: The repair mechanism includes a fluid replenishment and replacement device, which includes an outer box body and a rotating component, a pushing component, a hole opening component, a fluid replenishment and replacement component, and a hole sealing component arranged in the outer box body; The outer box body is provided with a liquid replenishment interface; The hole opening component, the liquid replenishment component and the hole sealing component are all connected to the rotating component, and the rotating component can rotate the hole opening component, the liquid replenishment component and the hole sealing component to the liquid replenishment interface respectively; The push assembly provides a linear thrust to move the hole opening assembly, the liquid replenishment and replacement assembly, and the hole sealing assembly toward the liquid replenishment and replacement interface; The hole opening component, the fluid replenishing and exchanging component and the hole sealing component can realize the hole opening, fluid replenishing and exchanging and hole sealing operations under the action force of the pushing component.

92. The large-capacity battery assembly according to claim 91, characterized in that: The rotating assembly includes at least one turntable and a rotating drive unit, and the rotating drive unit includes a rotating shaft and a rotating motor; the hole opening assembly, the liquid replacement assembly and the hole sealing assembly are all installed on the turntable, the turntable is connected to the rotating shaft, and the rotating motor is connected to the rotating shaft to rotate the turntable.

93. The large-capacity battery assembly according to claim 91, characterized in that: There are two turntables, including a front turntable and a rear turntable. The two ends of the hole opening component, the liquid replenishing component and the hole sealing component are respectively connected to the front turntable and the rear turntable. The front turntable and the rear turntable are connected by multiple screws, and the multiple screws are evenly distributed along the circumference of the turntable.

94. The large-capacity battery assembly according to claim 91, characterized in that: The push assembly includes a push rod, a push motor and a gear rack assembly; the output shaft of the push motor is connected to the gear in the gear rack assembly, the rotation of the gear drives the rack to make linear motion, the push rod is connected to the rack, and the push rod applies linear thrust under the drive of the rack.

95. The large-capacity battery assembly according to claim 94, characterized in that: The end of the push rod for applying linear thrust has a curved surface.

96. A large capacity battery assembly according to any one of claims 91 to 95, characterized in that: The hole-opening assembly includes a mounting sleeve, a mounting rod and a hole-opening unit, and the hole-opening unit includes a hole-opening motor, a drill chuck and a spiral drill bit; the mounting sleeve is fixedly mounted on the rotating assembly, and the mounting rod is mounted in the mounting sleeve, one end of which is used to contact the jacking assembly, and the other end extends out of the mounting sleeve and is fixedly connected to the outer shell of the hole-opening motor, and is mainly used to transmit the linear thrust of the jacking assembly to the hole-opening unit. The hole-opening motor is connected to the spiral drill bit through the drill chuck, and the spiral drill bit realizes the hole-opening operation.

97. The large-capacity battery assembly according to claim 96, characterized in that: The hole opening assembly also includes a hole opening positioning spring, which is sleeved on the spiral drill bit and is used to control the feed amount of the spiral drill bit and provide a force to restore the hole opening unit to an initial position.

98. A large capacity battery assembly according to any one of claims 91 to 95, characterized in that: The liquid replenishing and replacing component includes an inner liquid injection cylinder, an outer liquid injection cylinder and an liquid injection spring; the outer liquid injection cylinder is connected to the rotating component, the inner liquid injection cylinder is arranged in the outer liquid injection cylinder, and is also used to connect with an external pipeline, the liquid injection spring is arranged in the outer liquid injection cylinder, and after the liquid replenishing and replacing operation is completed in the inner liquid injection cylinder, it provides a force to restore the inner liquid injection cylinder to its initial position.

99. The large-capacity battery assembly according to claim 98, characterized in that: The end of the liquid injection inner cylinder is provided with a conical nozzle, and the liquid injection outer cylinder is provided with a long strip through groove, so that the connecting hose between the liquid injection inner cylinder and the external pipeline can move in the long strip through groove.

100. The large-capacity battery assembly according to any one of claims 91 to 95, characterized in that: The hole sealing assembly includes a hole sealing spring, a hole sealing cylinder and a hole sealing push rod; the hole sealing cylinder is connected to the rotating assembly, the hole sealing push rod is arranged in the hole sealing cylinder, and can push the sealing plug to perform the hole sealing operation under the action of the pushing assembly, and the hole sealing spring is arranged in the hole sealing cylinder, and after the hole sealing push rod completes the hole sealing operation, it provides a force to restore the hole sealing push rod to its initial position.

101. A large-capacity battery assembly according to any one of claims 91 to 95, characterized in that: The repair mechanism also includes a replacement fluid connection component; the replacement fluid connection component includes a first replacement fluid connector and a second replacement fluid connector; the first replacement fluid connector is used to be installed on a large-capacity battery, and the second replacement fluid connector is used to be installed on a replacement fluid device; the first replacement fluid connector includes a connector body, and a channel that communicates with the inner cavity of the large-capacity battery is opened on the connector body; a first connecting flange is provided on the outer wall of the connector body, and the first connecting flange divides the connector body into a connecting section and an insertion section; the second replacement fluid connector includes a connecting sleeve, and a second connecting flange is provided at the end of the connecting sleeve; the insertion section of the first replacement fluid connector is inserted into the connecting sleeve of the second replacement fluid connector to realize the plug-in positioning of the first replacement fluid connector and the second replacement fluid connector, and at the same time, the first replacement fluid connector and the second replacement fluid connector are fixedly connected through the first connecting flange and the second connecting flange.

102. The large-capacity battery assembly according to claim 101, characterized in that: The radial end surface of the first connecting flange close to the insertion section has a first sealing boss; the radial end surface of the second connecting flange away from the connecting sleeve has a second sealing boss; a first sealing ring is arranged between the first sealing boss and the second sealing boss.

103. The large-capacity battery assembly according to claim 102, characterized in that: The insertion section of the joint body is also provided with an annular boss connected to the first connecting flange, and the radial end surface of the annular boss away from the first connecting flange is the first sealing surface; the inner wall of the connecting sleeve is provided with an annular notch, and the radial end surface of the annular notch away from the second connecting flange is the second sealing surface; a second sealing ring is provided between the first sealing surface and the second sealing surface.

104. The large-capacity battery assembly according to claim 101, characterized in that: An annular limiting boss is provided on the connecting section of the joint body, and the annular limiting boss is used to cooperate with the large-capacity battery to achieve the fixation of the first liquid replenishing and replacement joint.

105. The large-capacity battery assembly according to claim 101, characterized in that: The end of the joint body insertion section is provided with an annular chamfer.

106. The large-capacity battery assembly according to claim 101, characterized in that: The channels in the first replacement fluid connector include a ninth channel and a tenth channel that are isolated from each other. The ninth channel is used to communicate with the electrolyte area of ​​the large-capacity battery, and the tenth channel is used to communicate with the gas area of ​​the large-capacity battery.

107. The large-capacity battery assembly according to claim 106, characterized in that: The ninth channel is connected to an electrolyte pipe section, and the ninth channel is communicated with the electrolyte area of ​​the large-capacity battery through the electrolyte pipe section.

108. The large-capacity battery assembly according to claim 107, characterized in that: The joint body is also provided with a sealing channel which is communicated with the channel, and a rubber ring is arranged in the sealing channel.

109. The large-capacity battery assembly according to claim 108, characterized in that: The ninth channel and the tenth channel are L-shaped flow channels.

110. The large-capacity battery assembly according to claim 1, characterized in that: The repair mechanism includes a fluid injection and explosion relief component; The liquid injection and explosion relief components include liquid injection components and explosion relief pipe components; The liquid injection component includes a columnar liquid injection component body and a third plugging component; the liquid injection component body is fixed to the shell, and a third channel is opened on the liquid injection component body and is connected to the electrolyte area of ​​the inner cavity of the shell; the third plugging component is used to plug the third channel; and the third plugging component can be separated from the third channel under the action of thermal runaway pressure or temperature of the lithium-ion battery; The explosion-relief pipe component comprises an explosion-relief pipe and an explosion-relief membrane fixed in the explosion-relief pipe; the explosion-relief pipe is coaxially sealed and sleeved with the main body of the liquid injection and replacement component in a detachable manner.

111. The large-capacity battery assembly according to claim 110, characterized in that: The main body of the liquid injection and replacement component is also provided with a fourth channel which is connected with the gas area of ​​the inner cavity of the shell; the fourth channel is isolated from the third channel; and the third blocking member is also used to block the fourth channel.

112. The large-capacity battery assembly according to claim 111, characterized in that: The third blocking member is solid paraffin filled in the third channel and the fourth channel.

113. The large-capacity battery assembly according to claim 112, characterized in that: It also includes an electrolyte connecting tube and a gas connecting tube; the third channel is connected through the electrolyte connecting tube and the electrolyte area of ​​the inner cavity of the shell; the fourth channel is connected through the gas connecting tube and the gas area of ​​the inner cavity of the shell.

114. The large-capacity battery assembly according to claim 111, characterized in that: The main body of the liquid injection and replacement component is a cylinder; a first blind hole is provided along the axial direction of the cylinder; a second blind hole and a third blind hole isolated from each other are provided at the bottom of the blind hole along the axial direction of the cylinder; a fifth through hole and a sixth through hole respectively connected with the second blind hole and the third blind hole are provided along the radial direction of the cylinder; the second blind hole and the fifth through hole constitute a fourth channel; the third blind hole and the sixth through hole constitute a third channel; and the explosion relief pipe is sealed and sleeved in the first blind hole.

115. The large-capacity battery assembly according to claim 114, characterized in that: The outer wall of the explosion relief pipe is threadedly connected to the inner wall of the first blind hole.

116. The large-capacity battery assembly according to claim 110, characterized in that: One end of the fourth channel is located in the inner cavity of the shell and is communicated with the gas area in the inner cavity of the shell.

117. The large-capacity battery assembly according to claim 113, characterized in that: One end of the electrolyte connecting tube is fixed to one end of the third channel, and the other end port is close to the bottom plate of the shell; and in the height direction of the shell, the highest position of the electrolyte connecting tube is higher than the electrolyte liquid level in the inner cavity of the shell.

118. The large-capacity battery assembly according to claim 1, characterized in that: The housing is also provided with a gas chamber; the gas chamber is connected to the gas area of ​​the inner cavity of each single battery; the repair mechanism includes a functional interface; The functional interface includes a columnar body, a second explosion relief mechanism, a fourth blocking piece and a fifth blocking piece; a liquid channel, a gas channel and a second explosion relief channel are provided on the columnar body; a port at one end of the liquid channel is connected to the electrolyte shared chamber, and a fourth blocking piece is provided at the other port; a port at one end of the gas channel is connected to the gas chamber, and a fifth blocking piece is provided at the other port; a port at one end of the second explosion relief channel is connected to the gas chamber, and a second explosion relief mechanism is provided at the other port.

119. The large-capacity battery assembly according to claim 118, characterized in that: The outer shell includes a first cylinder with open ends at both ends and end plate assemblies respectively fixed to the two open ends of the first cylinder; the avoidance hole is opened on the top plate of the first cylinder; the electrolyte sharing chamber is located on the bottom plate of the first cylinder; the gas chamber is located on the top plate of the first cylinder; and the functional interface is located on one of the end plate assemblies.

120. The large-capacity battery assembly according to claim 119, characterized in that: The end plate assembly provided with a functional interface comprises a first sub-end plate; the first sub-end plate is provided with a communication channel which is communicated with a gas channel or an electrolyte channel.

121. The large-capacity battery assembly according to claim 120, characterized in that: The communication channel is a groove arranged on the first sub-end plate along the height direction and a blocking plate fixedly covering the groove.

122. The large-capacity battery assembly according to claim 121, characterized in that: The end plate assembly provided with a functional interface also includes a second sub-end plate; the second sub-end plate is tightly attached to the outermost single battery cell in the housing and is fixedly connected to the first sub-end plate.

123. The large-capacity battery assembly according to claim 122, characterized in that: The second sub-end plate is fixedly connected to the first sub-end plate by screws; a gasket is provided between the second sub-end plate and the first end plate, and the screw head passes through the second sub-end plate and the gasket in sequence to be connected to the first sub-end plate.

124. The large-capacity battery assembly according to claim 123, characterized in that: The fourth blocking piece is a plug provided with external threads; the fourth blocking piece and the fifth blocking piece have the same structure.

125. The large-capacity battery assembly according to claim 124, characterized in that: The second explosion relief mechanism is an explosion relief membrane.

126. The large-capacity battery assembly according to claim 1, characterized in that: The repair mechanism is a slow-release lithium replenishing device; the electrolyte sharing chamber is located at the bottom of the shell, and the slow-release lithium replenishing device is arranged in the electrolyte sharing chamber; The slow-release lithium supplement device comprises an outer shell and lithium salt particles arranged in the outer shell. The outer shell is insoluble in electrolyte and has at least one micropore on the side wall of the outer shell so that lithium ions of the lithium salt particles are slowly released in the electrolyte of the outer shell.

127. The large-capacity battery assembly according to claim 126, characterized in that: The lithium salt particles are inorganic lithium salt particles, which are tightly filled in the inner cavity of the shell body, and the particle size of the inorganic lithium salt particles is larger than the pore size of the micropores.

128. The large-capacity battery assembly according to claim 126, characterized in that: The outer shell is a plastic outer shell.

129. The large-capacity battery assembly according to any one of claims 126 to 128, characterized in that: One end of the slow-release lithium supplement device is detachably sealed and installed on the side wall or end of the large-capacity battery housing.

130. The large-capacity battery assembly according to claim 129, characterized in that: The sustained-release lithium supplement device also includes a sealing cover fixedly connected to the outer shell, the sealing cover has an external thread, the side wall or end of the outer shell is provided with a through hole with an internal thread, the sealing cover is connected to the through hole of the large-capacity battery shell by threads, and a sealing gasket is installed at the threaded connection to achieve sealing.

131. A large capacity battery assembly according to any one of claims 126 to 128, characterized in that: One end of the slow-release lithium supplement device is fixedly mounted on the side wall or end of the shell.

132. The large-capacity battery assembly according to claim 131, characterized in that: The sustained-release lithium supplement device also includes a fixed block, on which a mounting column is provided, and the outer shell is sleeved on the mounting column. A mounting base is integrally provided on the side wall or end of the outer shell, and the fixed block is installed in a through hole of the mounting base by interference fit, and the fixed block is welded to the inner wall of the through hole of the mounting base.

133. The large-capacity battery assembly according to claim 1, characterized in that: The positive terminals of all the cells are connected as the total positive electrode, and the negative terminals of all the cells are connected as the total negative electrode; The repair mechanism includes an automatic lithium replenishing device; the automatic lithium replenishing device includes a lithium source, a lithium replenishing wire, a resistor and an induction switch; The lithium source is placed in the electrolyte sharing chamber; one end of the lithium replenishment wire extends into the shell and is connected to the lithium source, and the other end of the lithium replenishment wire extends out of the shell and is connected to the total negative electrode, and an induction switch and a resistor are sequentially arranged on the lithium replenishment wire located outside the shell from the total negative electrode to the lithium source, and the induction switch is used to detect the discharge electrical signal of the large-capacity battery, thereby turning on or off the lithium replenishment wire.

134. The large-capacity battery assembly according to claim 133, characterized in that: The induction switch is a current induction switch used to detect the direction of the current in the connecting cable between the battery and the external load.

135. The large-capacity battery assembly according to claim 133, characterized in that: The resistor is a sliding rheostat.

136. The large-capacity battery assembly according to claim 133, characterized in that: The lithium source comprises two copper mesh layers and a metal lithium layer arranged between the two copper mesh layers.

137. A large capacity battery assembly according to any one of claims 133 to 136, characterized in that: The automatic lithium replenishment device also includes a lithium replenishment power supply, which is used to apply a voltage between the lithium source and the negative electrode during the battery discharge phase so that the lithium replenishment current remains unchanged.

138. A repair mechanism, characterized in that: The repair mechanism is connected to the large-capacity battery and is used to repair the large-capacity battery after capacity decay or to suppress the decay rate of the large-capacity battery, so as to improve the performance and cycle life of the large-capacity battery.

139. The repair mechanism according to claim 138, characterized in that: It includes a fluid injection and exchange component; the fluid injection and exchange component includes a fluid injection and exchange component body and a sealing component fixed on the fluid injection and exchange component body; the fluid injection and exchange component body is used to be fixed on the outer shell, and a first channel that penetrates the inner cavity of the outer shell is opened on the fluid injection and exchange component body; the sealing component is used to block the first channel from the outside of the outer shell.

140. The repair mechanism according to claim 139, characterized in that: The main body of the fluid injection and replacement component is also provided with a second channel which is communicated with the inner cavity of the shell; and the blocking member is also used to block the second channel from the outside of the shell.

141. The repair mechanism according to claim 140, characterized in that: The main body of the liquid injection and replacement component is a column, and the first channel and the second channel are both through holes opened on the main body of the liquid injection and replacement component.

142. The repair mechanism according to claim 141, characterized in that: The second channel is an L-shaped through hole, including a horizontal through hole and a vertical through hole, wherein the horizontal through hole is opened along the axial direction of the liquid injection and replacement component body, and the longitudinal cross-section of the horizontal through hole is a fan ring.

143. The repair mechanism according to claim 141, characterized in that: The second channel includes a horizontal through hole group and vertical through holes, wherein the horizontal through hole group is opened axially along the main body of the liquid injection and replacement component, and the horizontal through hole group is a plurality of through holes connected with the vertical through holes, and the plurality of through holes are arranged along the same circumference.

144. The repair mechanism according to any one of claims 139 to 143, characterized in that: The blocking member includes an elastic blocking column sealed in the first channel and the second channel.

145. The repair mechanism according to any one of claims 139 to 143, characterized in that: The blocking member includes a sealing plate and a first hot melt member; A step hole is provided on the main body of the liquid injection and replacement component; the step hole is connected with the first channel and the second channel; a sealing plate is fixed on the step surface of the step hole, and a first hot melt component is fixed on the sealing plate and in the step hole where the sealing plate is located.

146. The repair mechanism according to any one of claims 139-143, characterized in that: The blocking member comprises a hydraulic quick connector body which is respectively sealed in the first channel and the second channel.

147. The repair mechanism according to any one of claims 139 to 143, characterized in that: The sealing member includes a first rubber ring and a second hot melt member; A countersunk hole penetrating the first channel and the second channel is provided along the axial direction of the liquid injection and replacement component body; the first rubber ring is coaxially fixed in the countersunk hole, and the second hot melt component is fixed in the first rubber ring by hot melting and blocks the first channel and the second channel.

148. The repair mechanism according to any one of claims 139 to 147, characterized in that: The blocking piece comprises a cap buckled on the main body of the liquid injection and replacement component.

149. The repair mechanism according to claim 138, characterized in that: It includes a fluid injection and exchange component; the fluid injection and exchange component includes a fluid injection and exchange component body, an electrolyte circulation pipe section and a plugging component; the fluid injection and exchange component body is used to be fixed on the outer shell, and a first channel communicating with the inner cavity of the outer shell is opened on the fluid injection and exchange component body; one end of the electrolyte circulation pipe section is fixed on the fluid injection and exchange component body and communicates with the first channel; the other end of the electrolyte circulation pipe section is used to communicate with the electrolyte area of ​​the inner cavity of the outer shell; the plugging component is used to block the first channel from the outside of the outer shell.

150. The repair mechanism according to claim 149, characterized in that: The main body of the liquid injection and replacement component is also provided with a second channel which is in communication with the gas area in the inner cavity of the shell; and the blocking member is also used to block the second channel from the outside of the shell.

151. The repair mechanism according to claim 150, characterized in that: The main body of the liquid injection and replacement component is a cylinder, and the first channel and the second channel are through holes opened on the main body of the liquid injection and replacement component.

152. The repair mechanism according to claim 151, characterized in that: An annular limiting boss is provided on the outer peripheral surface of the main body of the liquid injection and replacement component along the circumference direction thereof, and is used to cooperate with the shell to achieve the fixation of the main body of the liquid injection and replacement component.

153. The repair mechanism according to claim 151, characterized in that: The second channel is opened along the axial direction of the liquid injection and replacement component body, and its longitudinal cross section is a fan ring.

154. The repair mechanism according to claim 151, characterized in that: The second channel includes a plurality of through holes opened along the axial direction of the main body of the liquid injection and replacement component, and the plurality of through holes are arranged along the same circumference.

155. The repair mechanism according to any one of claims 150-154, characterized in that: The sealing member includes a first rubber ring and a second hot melt member; a countersunk hole that penetrates the first channel and the second channel is opened axially along the main body of the liquid injection and replacement component; the first rubber ring is coaxially fixed in the countersunk hole, and the second hot melt member is fixed in the first rubber ring by hot melting and seals the first channel and the second channel.

156. The repair mechanism according to claim 155, characterized in that: The blocking member also includes a cap buckled on one end of the fluid injection and replacement component body, wherein the one end of the fluid injection and replacement component body is an end of the fluid injection and replacement component body located outside the shell.

157. The repair mechanism according to claim 138, characterized in that: The invention comprises a liquid injection component; the liquid injection component comprises a liquid injection component body and a plugging component; the liquid injection component body is used to be fixed on the shell, and a first channel that is connected to the inner cavity of the shell is opened on the liquid injection component body; the plugging component comprises a first rubber ring and a first sealing plate; the first rubber ring is coaxially fixed in the first channel, and the first sealing plate is fixed to the first end face of the first rubber ring by hot melting, and plugs the first channel; The first end face of the first rubber ring is the end face of the first rubber ring away from the lithium-ion battery housing.

158. The repair mechanism according to claim 157, characterized in that: It also includes an electrolyte circulation pipe section; one end of the electrolyte circulation pipe section is fixed on the liquid injection and replacement component body and is connected to the first channel; the other end of the electrolyte circulation pipe section is used to communicate with the electrolyte area in the inner cavity of the shell.

159. The repair mechanism according to claim 158, characterized in that: A second channel communicating with the gas zone in the inner cavity of the shell is also provided on the main body of the fluid injection and exchange component; the first channel is a stepped through hole provided along the main body of the fluid injection and exchange component; the second channel is isolated from the small hole of the stepped through hole and communicates with the large hole of the stepped through hole; the first rubber ring is coaxially fixed in the large hole of the stepped through hole.

160. The repair mechanism according to claim 159, characterized in that: The axial length of the first rubber ring is greater than the axial length of the large hole of the step through hole; one end of the first rubber ring is in close contact with the step surface of the step through hole, and the outer side of the other end is provided with an annular folded edge along its circumference, and the annular folded edge is in close contact with the end surface of the large hole of the step through hole.

161. The repair mechanism according to claim 159, characterized in that: The second channel is opened along the axial direction of the liquid injection and replacement component body, and its longitudinal cross section is a fan ring.

162. The repair mechanism according to claim 159, characterized in that: The second channel includes a plurality of through holes opened along the axial direction of the main body of the liquid injection and replacement component, and the plurality of through holes are arranged along the same circumference.

163. The repair mechanism according to any one of claims 157 to 162, characterized in that: The blocking member also includes a cap buckled on one end of the fluid injection and replacement component body, wherein the one end of the fluid injection and replacement component body is an end of the fluid injection and replacement component body located outside the shell.

164. The repair mechanism according to claim 163, characterized in that: The sealing member also includes a sealing column fixed in the first rubber ring by hot melting.

165. The repair mechanism according to claim 157, characterized in that: An annular limiting boss is provided on the outer peripheral surface of the main body of the liquid injection and replacement component along the circumference direction thereof, and is used to cooperate with the shell to achieve the fixation of the main body of the liquid injection and replacement component.

166. The repair mechanism according to claim 138, characterized in that: The liquid injection and replacement component comprises a columnar liquid injection and replacement component body; the liquid injection and replacement component body is used to be fixed on the shell, and a fifth channel is opened on the liquid injection and replacement component body and is connected to the electrolyte area of ​​the inner cavity of the shell, and a first pipe is set in the fifth channel; The end of the first tube located outside the housing is sealed.

167. The repair mechanism according to claim 166, characterized in that: The main body of the liquid injection and replacement component is provided with a sixth channel which is communicated with the gas area in the inner cavity of the shell. The second pipe is sleeved in the sixth channel. The end of the second pipe located outside the shell is sealed.

168. The repair mechanism according to claim 167, characterized in that: The first pipe and the second pipe are made of plastic pipes that do not react with the electrolyte, and the ends located outside the shell are sealed by heat shrink extrusion sealing.

169. The repair mechanism according to claim 168, characterized in that: It also includes a sealing rubber plug; the fifth channel is a stepped through hole opened along the main body of the fluid injection and replacement component; the sixth channel is isolated from the small hole of the stepped through hole and is connected to the large hole of the stepped through hole; the ends of the first pipe fitting and the second pipe fitting located outside the shell are located in the large hole of the stepped through hole; the sealing rubber plug is inserted into the large hole of the stepped through hole to seal the fifth channel and the sixth channel.

170. The repair mechanism according to claim 169, characterized in that: A sealing rubber layer is arranged on the step surface of the fifth channel, and ends of the first pipe member and the second pipe member located outside the shell extend out of the sealing rubber layer.

171. The repair mechanism according to claim 169, characterized in that: It also includes a sealing end cover; the sealing end cover is detachably fixed to the main body of the liquid injection and replacement component to reseal the fifth channel and the sixth channel.

172. The repair mechanism according to claim 138, characterized in that: The invention comprises a liquid injection component; the liquid injection component comprises a liquid injection component body and a plugging component; the liquid injection component body is columnar and is used to be fixed on the shell, and a seventh channel that is connected to the electrolyte area of ​​the inner cavity of the shell is opened on the liquid injection component body; the plugging component comprises n groups of sealing units, wherein n is an integer greater than or equal to 1; when n is equal to 1, the sealing unit is arranged in the seventh channel to seal the seventh channel; when n is greater than 1, the n groups of sealing units are stacked in sequence in the seventh channel along the axial direction of the seventh channel to seal the seventh channel; Each group of sealing units includes a first sealing plug and a sealing coating which are stacked in sequence along the axial direction of the seventh channel. The first sealing plug is located on a side close to the inner cavity of the shell, and the sealing coating is located on a side away from the inner cavity of the shell.

173. The repair mechanism according to claim 172, characterized in that: An annular groove is provided on the inner wall of the seventh channel along its circumference; a limit ring is installed in the annular groove; the end face of the outermost sealing unit in the seventh channel abuts against the limit ring, and the limit ring limits the axial movement of n groups of sealing units in the seventh channel; wherein the outermost sealing unit in the seventh channel is the sealing unit that is farthest from the inner cavity of the shell in the axial direction of the seventh channel.

174. The repair mechanism according to claim 173, characterized in that: The blocking member also includes a second sealing plug; the second sealing plug is stacked along the axial direction of the seventh channel on the outside of the outermost sealing unit, and the end surface of the second sealing plug abuts against the limit retaining ring.

175. The repair mechanism according to any one of claims 172 to 174, characterized in that: An eighth channel communicating with the gas zone in the inner cavity of the shell is provided on the main body of the fluid injection and exchange component; the seventh channel is a stepped through hole provided along the main body of the fluid injection and exchange component; the eighth channel is isolated from the small hole of the stepped through hole and communicated with the large hole of the stepped through hole; and the blocking member is arranged in the large hole of the stepped through hole.

176. The repair mechanism according to claim 175, characterized in that: The large hole of the step through hole is a tapered hole, and the small end of the tapered hole is close to the small hole of the step through hole.

177. The repair mechanism according to claim 175, characterized in that: It also includes an electrolyte connecting pipe section; one end of the electrolyte connecting pipe section is fixed on the main body of the liquid injection and replacement component and is connected with the seventh channel; the other end of the electrolyte connecting pipe section is used to communicate with the electrolyte area in the inner cavity of the shell.

178. The repair mechanism according to claim 175, characterized in that: The sealing coating adopts sealing paint which does not react with the electrolyte.

179. The repair mechanism according to claim 138, characterized in that: The invention comprises a liquid injection and explosion relief component; the liquid injection and explosion relief component comprises a liquid injection component and an explosion relief pipe component; the liquid injection component comprises a columnar liquid injection component body and a third plugging component; the liquid injection component body is used to be fixed on the shell, and a third channel for communicating with the electrolyte area in the inner cavity of the shell is opened on the liquid injection component body; the third plugging component is used to plug the third channel; and the third plugging component can be separated from the third channel under the action of thermal runaway pressure or temperature of the lithium-ion battery; The explosion-relief pipe component comprises an explosion-relief pipe and an explosion-relief membrane fixed in the explosion-relief pipe; the explosion-relief pipe is coaxially sealed and sleeved with the main body of the liquid injection and replacement component in a detachable manner.

180. The repair mechanism according to claim 179, characterized in that: The main body of the liquid injection and replacement component is also provided with a fourth channel which is connected with the gas area of ​​the inner cavity of the shell; the fourth channel is isolated from the third channel; and the third blocking member is also used to block the fourth channel.

181. The repair mechanism according to claim 180, characterized in that: The third blocking member is solid paraffin filled in the third channel and the fourth channel.

182. The repair mechanism according to claim 181, characterized in that: It also includes an electrolyte connecting tube and a gas connecting tube; the third channel is connected through the electrolyte connecting tube and the electrolyte area of ​​the inner cavity of the shell; the fourth channel is connected through the gas connecting tube and the gas area of ​​the inner cavity of the shell.

183. The repair mechanism according to claim 180, characterized in that: The main body of the liquid injection and replacement component is a cylinder; a first blind hole is provided along the axial direction of the cylinder; a second blind hole and a third blind hole isolated from each other are provided at the bottom of the blind hole along the axial direction of the cylinder; a fifth through hole and a sixth through hole respectively connected with the second blind hole and the third blind hole are provided along the radial direction of the cylinder; the second blind hole and the fifth through hole constitute a fourth channel; the third blind hole and the sixth through hole constitute a third channel; and the explosion relief pipe is sealed and sleeved in the first blind hole.

184. The repair mechanism according to claim 183, characterized in that: The outer wall of the explosion relief pipe is threadedly connected to the inner wall of the first blind hole.

185. The repair mechanism according to claim 138, characterized in that: An automatic lithium replenishing device is included, including a lithium source, a lithium replenishing wire, a resistor and an induction switch; The lithium source is used to be arranged in the inner cavity of the battery; one end of the lithium replenishment wire is electrically connected to the lithium source, and the other end is used to be connected to the negative terminal of the battery, and the lithium replenishment wire is provided with an induction switch and a resistor in sequence from the connection end connected to the negative terminal of the battery to the connection end connected to the lithium source; the induction switch is used to detect Measure the discharge electrical signal of the battery, and then make the lithium replenishment wire conductive or disconnected.

186. The repair mechanism according to claim 185, characterized in that: The induction switch is a current induction switch used to detect the direction of the current in the connecting cable between the battery and the external load.

187. The repair mechanism according to claim 185, characterized in that: The resistor is a sliding rheostat.

188. The repair mechanism according to claim 185, characterized in that: The lithium source comprises two copper mesh layers and a metal lithium layer arranged between the two copper mesh layers.

189. The repair mechanism according to any one of claims 185 to 188, characterized in that: It also includes a lithium replenishing power supply, which is used to apply a voltage between the lithium source and the negative electrode during the battery discharge phase so that the lithium replenishing current remains unchanged.

190. A method for repairing a large-capacity battery assembly, characterized in that: A repair mechanism is used to repair a large-capacity battery whose capacity has decayed or to suppress the decay rate of the large-capacity battery, so as to improve the performance and cycle life of the large-capacity battery.

191. The method for repairing a large-capacity battery assembly according to claim 190, characterized in that: After the large-capacity battery is charged and discharged for a set period of time, electrolyte is added to the electrolyte common chamber and the inner cavity of each single cell through the liquid injection component, or the electrolyte in the electrolyte common chamber and the inner cavity of each single cell is replaced.

192. The method for repairing a large-capacity battery assembly according to claim 190, characterized in that: Initial injection step: When the large-capacity battery is initially injected, the second one-way valve is opened by the hydraulic pressure of the electrolyte, and the electrolyte enters the inner cavity of the large-capacity battery through the second one-way valve. After the injection is completed, the hydraulic pressure is removed, and the second one-way valve is closed, completing the initial injection operation of the large-capacity battery; Rehydration step: using the hydraulic pressure of the electrolyte to open the second one-way valve, the electrolyte enters the large-capacity battery through the second one-way valve, and at the same time, using the external force to open the first one-way valve, the gas in the large-capacity battery is discharged outward through the first one-way valve. After the rehydration is completed, the hydraulic pressure and the external force are removed, the first one-way valve and the second one-way valve are closed, and the rehydration operation of the large-capacity battery is completed; Liquid replacement steps: first, use air pressure to open the first one-way valve, and the gas enters the inner cavity of the large-capacity battery through the first one-way valve. At the same time, use external force to open the second one-way valve, and the electrolyte in the large-capacity battery is discharged through the second one-way valve. After the discharge is completed, remove the air pressure and external force, and close the first one-way valve and the second one-way valve; Subsequently, the second one-way valve is opened by the hydraulic pressure of the electrolyte, and the electrolyte enters the large-capacity battery through the second one-way valve. At the same time, the first one-way valve is opened by external force, and the gas in the large-capacity battery is discharged outward through the first one-way valve, completing the liquid replacement operation of the large-capacity battery.

193. The method for repairing a large-capacity battery assembly according to claim 192, characterized in that: The method also includes a vacuuming step: before the initial liquid injection of the large-capacity battery, an external force is used to open the first one-way valve or the second one-way valve, and the vacuuming device is turned on to perform a vacuuming operation on the large-capacity battery.

194. The method for repairing a large-capacity battery assembly according to claim 192, characterized in that: The method also includes a formation and exhaust step: after the initial liquid injection of the large-capacity battery is completed, the large-capacity battery begins to be formed. During this process, an external force is used to open the first one-way valve. During this formation process, the gas generated in the large-capacity battery is discharged to the outside through the first one-way valve, thereby completing the formation and exhaust operation.

195. The method for repairing a large-capacity battery assembly according to claim 190, characterized in that: The following steps are involved: S1. Connecting: Connecting the liquid replacement interface of the liquid replacement device to the liquid replacement connector of the lithium-ion battery; S2, opening: rotating the opening assembly to the interface of the replacement fluid; The push assembly provides a linear thrust to move the hole opening assembly toward the replacement fluid interface, and the hole opening assembly forms a hole on the replacement fluid connector of the lithium-ion battery; the push assembly and the hole opening assembly return to their initial positions; S3, replenishing and replacing fluid: the rotating assembly rotates the replenishing and replacing fluid assembly to the replenishing and replacing fluid interface; the pushing assembly provides a linear thrust to move the replenishing and replacing fluid assembly toward the replenishing and replacing fluid interface, and the replenishing and replacing fluid assembly is docked with the opening formed on the replenishing and replacing fluid connector of the lithium-ion battery, and then the replenishing and replacing fluid assembly performs replenishing or replacing fluid on the lithium-ion battery; the pushing assembly and the replenishing and replacing fluid assembly return to their initial positions; S4, sealing: the rotating assembly rotates the sealing assembly to the replacement fluid interface; the pushing assembly provides a linear thrust to move the sealing assembly toward the replacement fluid interface, and the sealing assembly, under the action of the pushing assembly, squeezes the sealing plug into the opening of the lithium-ion battery replacement fluid connector to seal the replacement fluid connector of the large-capacity battery; the pushing assembly and the sealing assembly return to their initial positions; S5. Disassembly and separation: disassembly and separation of the liquid replacement interface of the liquid replacement device and the liquid replacement connector of the lithium-ion battery.

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