High-capacity battery and end plate assembly

Abstract

The utility model discloses a high-capacity battery and an end plate assembly. The high-capacity battery comprises a shell and m single batteries arranged in the shell, the shell is provided with an electrolyte sharing chamber, a gas chamber and a functional interface; the functional interface comprises a cylindrical body, an explosion venting mechanism, a first plugging piece and a second plugging piece; a liquid channel, a gas channel and an explosion venting channel are formed in the cylindrical body; one end port of the liquid channel is communicated with the electrolyte sharing chamber, and the other end port is provided with a first plugging piece; one end port of the gas channel is communicated with the gas chamber, and the other end port is provided with a second plugging piece; one end opening of the explosion venting channel is communicated with the gas cavity, and the other end opening is provided with an explosion venting mechanism. The electrolyte sharing cavity does not need to be plugged, so that the processing difficulty and the processing cost of the high-capacity battery with the sharing system are greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, in particular to a large-capacity battery and an end plate assembly. Background Art

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

[0003] Chinese patent CN 219144456 U discloses a large-capacity battery, the structure of which is as follows Figure 1 As shown, it includes a battery pack body formed by a plurality of single cells connected in parallel and a shared pipeline assembly located at the bottom of the battery pack body; the shared pipeline assembly is used to connect all the inner cavities of the plurality of single cells so that all the single cells in the large-capacity battery are in one electrolyte system. The large-capacity battery can enhance the uniformity of the electrolyte of each single cell in the large-capacity battery through the shared pipeline assembly, improve the cycle life, and can also replenish the electrolyte for the large-capacity battery through the shared pipeline assembly, thereby extending the service life of the large-capacity battery and improving the safety of the large-capacity battery.

[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 by 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 battery, and the sub-pipes extend along the arrangement direction of the single battery 2, and are extruded integrally with the lower cover plate 03 of the single battery, and are connected to the opening of the lower cover plate 03 of the single battery.

[0005] During assembly, the two ends of the sub-pipeline 01 are used as connecting ends with the middle connecting tube 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 tube 02 .

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

[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 the above-mentioned integrated part is welded to the cylinder, due to the difference in the welding process, the position of the sub-pipeline relative to the cylinder may be inconsistent, which may lead to deviation in the coaxiality of each sub-pipeline during plugging;

[0009] 3) This solution requires the use of special tooling during plugging. Due to improper use of the tooling or problems with the operation of the construction personnel, the coaxiality of each sub-pipeline may deviate if it is not careful.

[0010] In addition, when plugging in, the deviation between the sub-pipelines will increase with the increase in the number of plug-ins, resulting in the coaxiality between the sub-pipelines being more difficult to ensure as the number of plug-ins increases; resulting in the assembly process, the yield rate decreases as the number of plug-ins 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 cylinder during insertion, thereby causing damage to the battery. Utility Model Content

[0012] The utility model provides a large-capacity battery, which overcomes the problem that the existing large-capacity battery shared pipeline components are difficult to assemble.

[0013] The technical solution of the utility model is to provide a large-capacity battery, which is special in that it 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;

[0014] The shell is provided with avoidance holes through which the polarity terminals of each single battery can extend; the polarity terminals of each single battery extend out of the corresponding avoidance holes, and the shell area around the avoidance holes is fixedly sealed with the shell of the single battery;

[0015] The housing is provided with an electrolyte sharing chamber, a gas chamber and a functional interface;

[0016] The electrolyte sharing chamber is connected to the electrolyte area of ​​each single cell; the gas chamber is connected to the gas area of ​​each single cell;

[0017] The functional interface includes a columnar body, an explosion relief mechanism, a first blocking member and a second blocking member;

[0018] The columnar body is provided with a liquid channel, a gas channel and an explosion relief channel;

[0019] One end port of the liquid channel is connected to the electrolyte sharing chamber, and the other end port is provided with a first blocking member;

[0020] One end port of the gas channel is connected to the gas chamber, and the other end port is provided with a second blocking member;

[0021] One end of the explosion relief channel is connected to the gas chamber, and the other end is provided with an explosion relief mechanism.

[0022] The utility model places a plurality of single cells inside a shell having a shared electrolyte chamber at the bottom, and utilizes the shared electrolyte chamber to communicate with the inner cavities of each single cell located in the shell, so that the electrolyte of each single cell is shared to ensure the consistency of each single cell, that is, the electrolyte chambers of each single cell are connected, so that the electrolytes of all the single cells are in the same system, reducing the differences between the electrolytes of each single cell, improving the consistency between the single cells to a certain extent, and thus improving the cycle life of the large-capacity battery to a certain extent.

[0023] The utility model does not require plugging in the shared electrolyte chamber, and there is no need to consider the coaxial plugging problem in the arrangement direction of the single battery cells, and has low requirements for processing accuracy and assembly accuracy. At the same time, no special tooling is required, and the assembly process is relatively simple, which greatly reduces the processing difficulty and processing cost of such large-capacity batteries with a shared system, and can realize mass production.

[0024] In addition, the utility model sets a functional interface on the shell. When the large-capacity battery is charged and discharged for a period of time, the electrolyte is decomposed and consumed, resulting in a decrease in the performance of the large-capacity battery. The electrolyte can be added to 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 and affects 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 partial replacement or full replacement.

[0025] Third, when the gas pressure inside the large-capacity battery is not conducive to the injection and replacement operation, the gas can be exhausted outward through the gas channel to reduce the gas pressure inside the large-capacity battery, so that the electrolyte flows smoothly during the injection and replacement process, and the electrolyte can also fully infiltrate the pole pieces of each single battery.

[0026] Fourth, when a large-capacity battery experiences thermal runaway, the thermal runaway smoke generated in the large-capacity battery can also be released through the explosion venting channel to avoid more serious accidents, thereby improving the safety of the large-capacity battery.

[0027] Fifth, the functional interface integrates the liquid channel, gas channel, and explosion-relief channel into a columnar body, which facilitates the processing of parts and the assembly of large-capacity batteries.

[0028] Furthermore, the housing includes a cylinder with open ends at both ends and end plate assemblies respectively fixed to the two open ends of the cylinder;

[0029] The avoidance hole is opened on the top plate of the cylinder;

[0030] The electrolyte sharing chamber is located on the bottom plate of the cylinder; the gas chamber is located on the top plate of the cylinder;

[0031] The functional interface is located on one of the end plate assemblies. When such large-capacity batteries are assembled into energy storage devices, 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 functional interface is set on the end plate assembly, the injection and replacement of the fluid can be conveniently performed, and the explosion relief pipeline in the energy storage device can be reasonably arranged.

[0032] Furthermore, the end plate assembly provided with a functional interface includes a first sub-end plate; the first sub-end plate is provided with a connecting channel connected to the gas channel or the electrolyte channel.

[0033] Furthermore, 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.

[0034] Furthermore, the end plate assembly provided with the gas injection and exhaust components and the liquid replenishment and replacement components 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.

[0035] 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 be connected to the first sub-end plate.

[0036] Furthermore, the first blocking member is a plug provided with external threads; the first blocking member and the second blocking member have the same structure.

[0037] Furthermore, the explosion relief mechanism is an explosion relief membrane.

[0038] The utility model also provides an end plate assembly, which is special in that it comprises a first sub-end plate and a functional interface arranged on the first sub-end plate;

[0039] The functional interface includes a columnar body, an explosion relief mechanism, a first blocking member and a second blocking member;

[0040] The columnar body is provided with a liquid channel, a gas channel and an explosion relief channel;

[0041] One end port of the liquid channel is connected to the electrolyte sharing chamber, and the other end port is provided with a first blocking member;

[0042] One end port of the gas channel is connected to the gas chamber, and the other end port is provided with a second blocking member;

[0043] One end of the explosion relief channel is connected to the gas chamber, and the other end is provided with an explosion relief mechanism.

[0044] Furthermore, the first sub-end plate is provided with a communication channel communicating with the gas channel or the electrolyte channel.

[0045] The beneficial effects of the utility model are:

[0046] The utility model places a plurality of single cells inside a shell having a shared electrolyte chamber at the bottom, and utilizes the shared electrolyte chamber to communicate with the inner cavities of each single cell located in the shell, so that the electrolyte of each single cell is shared to ensure the consistency of each single cell, that is, the electrolyte chambers of each single cell are connected, so that the electrolytes of all the single cells are in the same system, reducing the differences between the electrolytes of each single cell, improving the consistency between the single cells to a certain extent, and thus improving the cycle life of the large-capacity battery to a certain extent.

[0047] The utility model does not require plugging in the shared electrolyte chamber, and there is no need to consider the coaxial plugging problem in the arrangement direction of the single battery cells, and has low requirements for processing accuracy and assembly accuracy. At the same time, no special tooling is required, and the assembly process is relatively simple, which greatly reduces the processing difficulty and processing cost of such large-capacity batteries with a shared system, and can realize mass production.

[0048] In addition, the utility model sets a functional interface on the shell. When the large-capacity battery is charged and discharged for a period of time, the electrolyte is decomposed and consumed, resulting in a decrease in the performance of the large-capacity battery. The electrolyte can be added to 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 and affects 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 partial replacement or full replacement.

[0049] Third, when the gas pressure inside the large-capacity battery is not conducive to the injection and replacement operation, the gas can be exhausted outward through the gas channel to reduce the gas pressure inside the large-capacity battery, so that the electrolyte flows smoothly during the injection and replacement process, and the electrolyte can also fully infiltrate the pole pieces of each single battery.

[0050] Fourth, when a large-capacity battery experiences thermal runaway, the thermal runaway smoke generated in the large-capacity battery can also be released through the explosion venting channel to avoid more serious accidents, thereby improving the safety of the large-capacity battery.

[0051] Fifth, the functional interface integrates the liquid channel, gas channel, and explosion-relief channel into a columnar body, which facilitates the processing of parts and the assembly of large-capacity batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural schematic diagram of a large-capacity battery in the background technology;

[0053] Figure 2 This is a schematic diagram of the structure of a large-capacity battery in Example 1;

[0054] Figure 3 is a cross-sectional view of a large-capacity battery in Example 1;

[0055] Figure 4 is a three-dimensional schematic diagram of the first end plate assembly in Example 1;

[0056] Figure 5 for Figure 4 A cross-sectional view of

[0057] Figure 6 is a three-dimensional schematic diagram of the second end plate assembly in Example 1;

[0058] Figure 7 for Figure 6 A cross-sectional view of

[0059] Figure 8 is a three-dimensional schematic diagram of the end plate assembly in Example 2;

[0060] The accompanying drawings in the figure are marked as follows:

[0061] 01. Sub-pipeline; 02. Intermediate connecting pipe; 03. Lower cover of single battery;

[0062] 1. Shell; 2. Single cell; 21. Single cell pole; 3. Cylinder; 31. Cylinder bottom plate; 311. Electrolyte shared chamber; 32. Cylinder top plate; 321. Avoidance hole; 322. Gas chamber; 4. End plate assembly; 41. First sub-end plate; 411-connecting channel; 412. Groove; 413. Sealing plate; 42. Second sub-end plate; 43. Gasket; 5. Pole adapter; 6. Functional interface; 61. Column; 611. Liquid channel; 612. Gas channel; 613. Explosion relief channel; 62. Explosion relief mechanism; 63. First sealing member; 64. Second sealing member. DETAILED DESCRIPTION

[0063] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary persons in the field without creative work should fall within the scope of protection of the utility model.

[0064] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and 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.

[0065] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "top, bottom" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second, etc." are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0066] The utility model provides a large-capacity battery, comprising a shell and m parallel-connected single cells arranged in the shell, where m>1; the single cells described herein can be square shell batteries or multiple parallel-connected soft-pack batteries available on the market. The inner cavity of each single cell includes an electrolyte region and a gas region.

[0067] 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.

[0068] The outer shell is provided with an electrolyte sharing chamber, a gas chamber, and a functional interface; the electrolyte sharing chamber is connected with the electrolyte area of ​​the inner cavity of each single battery; the gas chamber is connected with the gas area of ​​the inner cavity of each single battery; the functional interface includes a columnar body, an explosion-proof mechanism, a first plugging piece and a second plugging piece; the columnar body is provided with a liquid channel, a gas channel and an explosion-proof channel; a port at one end of the liquid channel is connected with the electrolyte sharing chamber, and a first plugging piece is arranged at the other port; a port at one end of the gas channel is connected with the gas chamber, and a second plugging piece is arranged at the other port; a port at one end of the explosion-proof channel is connected with the gas chamber, and an explosion-proof mechanism is arranged at the other port.

[0069] The housing can have at least the following two structures:

[0070] The first structure includes a cylinder with open ends at both ends (i.e., the ports in the cylinder parallel to the yz plane are open ends) and end plate assemblies respectively fixed to the two open ends of the cylinder (i.e., the end plate assemblies are parallel to the yz plane);

[0071] In the outer shell of the first structure, the electrolyte sharing chamber can be located on the side plate of the cylinder (the side plate parallel to the xz plane) or the bottom plate of the cylinder, the gas chamber can be located on the side plate of the cylinder (the side plate parallel to the xz plane) or the top plate of the cylinder, and the functional interface can be located at any position of the outer shell as long as it can realize the corresponding function.

[0072] The second structure: includes a cylinder with open ends at the top and bottom (i.e., the ports in the 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 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 cylinder parallel to the yz plane is called an end plate assembly.

[0073] In the shell of the second structure, the electrolyte sharing chamber can be located on the side plate of the cylinder (the side plate parallel to the xz plane) or the lower cover plate, the gas chamber can be located on the side plate of the cylinder (the side plate parallel to the xz plane) or the upper cover plate, and the functional interface can be located at any position of the shell as long as it can realize the corresponding function.

[0074] The following embodiments mainly take the first structure as an example for introduction.

[0075] It should be noted here that the above-mentioned electrolyte sharing chamber is an electrolyte containing chamber, which, after being connected with the electrolyte area of ​​the inner cavity of each single battery, needs to ensure that the electrolyte in the entire large-capacity battery does not contact the external environment.

[0076] In order to improve the heat dissipation performance of such large-capacity batteries, avoidance holes are opened on the top plate of the 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 holes and the top plate area of ​​the cylinder around the avoidance holes is fixedly sealed with the single battery shell.

[0077] It should be noted that the single cell polarity terminal described here can be a single cell pole. In order to avoid the single cell pole 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.

[0078] The functional interface can be located at any position of the shell, for example, it can be set on the side wall of the 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 reduced performance of the large-capacity battery. The gas channel of the functional interface can be used to change the pressure in the inner cavity of the shell, and the electrolyte can be smoothly added to the inner cavity of the shell through the liquid channel 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 performance of the large-capacity 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 cooperation of the functional interface to improve the performance of the large-capacity battery. The replacement here can be partial replacement or full replacement. In addition, after the electrolyte area in the inner cavity of each single cell is connected to the electrolyte sharing chamber, the electrolyte can be injected into the shell again by the cooperation of the functional interface to ensure the continuity of the electrolyte.

[0079] In order to connect the electrolyte shared chamber with the electrolyte area of ​​each single cell cavity, and connect the gas chamber with the gas area of ​​each single cell cavity, the single cell needs to be unpacked. In this embodiment, the single cell has a dissolving component that dissolves in the electrolyte and is arranged on the single cell. When the electrolyte dissolves the dissolving component, a first opening that connects the single cell cavity with the electrolyte shared chamber and a second opening that connects the single cell cavity with the gas chamber are formed on the single cell. The dissolving component can use the sealing film disclosed in Chinese patents CN219144296U and CN218525645U.

[0080] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0081] Example 1

[0082] like Figures 2 to 3 As shown, the large-capacity battery of this embodiment includes a housing 1 and 10 parallel-connected single cells 2 located in the housing 1. The single cells 2 are square-shell batteries. The number in other embodiments can be adjusted according to actual needs. The bottom and top of the housing of each single cell 2 are provided with through holes that penetrate the inner cavity thereof.

[0083] The housing 1 includes a cylinder 3 with open ends at both ends and end plate assemblies 4 respectively fixed to the two open ends of the cylinder 3; one of the end plate assemblies 4 is provided with a functional interface;

[0084] The bottom plate 31 of the cylinder is provided with an electrolyte sharing chamber 311 extending along the x direction; the electrolyte sharing chamber 311 is connected with the electrolyte area of ​​the inner cavity of each single battery 2 through the through hole of the single battery 2.

[0085] A gas chamber 322 extending along the x direction is provided on the top plate 32 of the cylinder; the gas chamber 322 is connected to the gas area of ​​the inner cavity of each single battery 2 through the through hole of the single battery 2.

[0086] The top plate 32 of the cylinder body is provided with an avoidance hole 321 through which the polarity terminal of each single cell 2 can be extended; the polarity terminal of each single cell 2 extends out of the avoidance hole 321, and the area of ​​the top plate 32 of the cylinder body around the avoidance hole 321 is fixedly sealed with the shell of the single cell 2. As can be seen from the figure, in this embodiment, the polarity terminal of the single cell 2 refers to the overall structure of the single cell pole 21 and the pole adapter 5.

[0087] The functional interface 6 includes a columnar body 61, an explosion relief mechanism 62, a first blocking piece 63 and a second blocking piece 64; a liquid channel 611, a gas channel 612 and an explosion relief channel 613 are provided on the columnar body 61; one end port of the liquid channel 611 is connected to the electrolyte shared chamber 311, and the other port is provided with a first blocking piece 63; one end port of the gas channel 612 is connected to the gas chamber 322, and the other port is provided with a second blocking piece 64; one end port of the explosion relief channel 613 is connected to the gas chamber 322, and the other port is provided with an explosion relief mechanism 62.

[0088] Combination Figure 4 and Figure 5 In this embodiment, the end plate assembly 4 provided with a functional interface 6 includes a first sub-end plate 41, which is sealed at one of the open ends of the cylinder 3, the electrolyte sharing chamber 311 and the gas chamber 322; a connecting channel 411 is provided on the first sub-end plate 41, and the functional interface 6 is provided on the outer surface of the first sub-end plate (the outer surface of the first sub-end plate refers to the surface of the first sub-end plate 41 away from each single battery 2 in the cylinder 3); it can be seen from the figure that in this embodiment, the connecting channel 411 is a vertical through hole opened on the first sub-end plate 41. In order to facilitate the opening of the vertical through hole, a groove 412 can be first opened on the inner surface of the first sub-end plate 41, and then a sealing plate 413 is covered at the opening of the groove to form a vertical through hole.

[0089] When the functional interface 6 is arranged at a position close to the gas chamber 322 on the first sub-end plate 41, the connecting channel 411 is used to connect the liquid channel 611 and the electrolyte shared chamber 311; when the functional interface 6 is arranged at a position close to the electrolyte shared chamber 311 on the first sub-end plate 41, the connecting channel 411 is used to connect the gas channel 612 and the gas chamber 322.

[0090] In some other embodiments, the connecting channel may be formed by casting or 3D printing when manufacturing the first sub-terminal 41 .

[0091] In this embodiment, the first sealing member 63 and the second sealing member 64 are plugs with external threads that are threadedly connected to the ends of the liquid channel and the gas channel respectively. When installing the plugs, sealant can also be provided on the threaded connection part to improve the sealing of this part.

[0092] In some other embodiments, the first blocking member 63 and the second blocking member 64 may also be plugs installed into the liquid channel and the gas channel by interference extrusion, but compared with the present embodiment, it is more difficult to disassemble.

[0093] In some other embodiments, the first blocking member 63 and the second blocking member 64 may also be plugs that seal the gas channel and the liquid channel respectively by hot melting, but this sealing method is more complicated to operate when sealing and opening the gas channel and the liquid channel.

[0094] It should be noted that the liquid channel 611, the gas channel 612 and the explosion relief channel 613 can be three horizontal through holes independently opened on the columnar body; or Figure 6 and Figure 7 As shown, the liquid channel 611 and the gas channel 612 are each a separate horizontal through hole, and the explosion relief channel 613 is a vertical hole set on the columnar body, one end of the vertical hole is connected to the gas channel or the liquid channel, and the other end of the vertical hole is provided with an explosion relief mechanism. The explosion relief mechanism can be an explosion relief membrane, or an explosion relief valve. In order to facilitate the production, the explosion relief mechanism in this embodiment is an explosion relief membrane, and the explosion relief membrane can be installed on the explosion relief channel later, or the explosion relief channel can be processed to be a weak area reserved at the port of the explosion relief channel.

[0095] Correspondingly, the other end plate assembly 4 (without a functional interface) in this embodiment can be a flat plate, which is sealed at the other open end of the cylinder 3 and seals the open ends of the electrolyte sharing chamber 311 and the gas chamber 322 at the same time.

[0096] When injection is required, follow these steps:

[0097] Remove the plugs provided in the gas channel 612 and the liquid channel 611;

[0098] When there is gas in the inner cavity of the housing 1, the gas will overflow from the gas channel 612, and it is easy to inject liquid into the inner cavity of the housing 1 through the liquid channel. In order to inject liquid more smoothly, in this step, an air extraction pipe can be inserted into the gas channel 612, and an external air extraction device connected to the air extraction pipe can be started to extract gas, so that a certain negative pressure is formed in the inner cavity of the housing 1;

[0099] Afterwards, the electrolyte injection tube is extended into the liquid channel 611 and the electrolyte is injected;

[0100] After the liquid replenishment is completed, the electrolyte injection tube and the air extraction tube are pulled out; and the plugs are then used to reseal the gas channel 612 and the liquid channel 611.

[0101] When the fluid needs to be changed, follow these steps:

[0102] Remove the plugs provided in the gas channel 612 and the liquid channel 611;

[0103] Insert the electrolyte extraction tube into the liquid channel 611 to directly extract the electrolyte; when the electrolyte cannot be extracted, insert the gas injection tube into the gas channel 612 to inject protective gas into the inner cavity of the shell 1 to extract the electrolyte; after the extraction is completed, take out the electrolyte extraction tube and the gas injection tube, extend the electrolyte injection tube into the liquid channel 611, and inject new electrolyte; after the injection is completed, remove the electrolyte injection tube;

[0104] The plug is then used to reseal the gas channel 612 and the liquid channel 611.

[0105] Example 2

[0106] Different from Example 1, Figure 8 As shown, in this embodiment, a second sub-end plate 42 is disposed between the first sub-end plate 41 and the outermost single battery 2 in the housing 1 . The second sub-end plate 42 is in close contact with the outermost single battery 2 and is fixedly connected to the first sub-end plate 41 .

[0107] By adding a second sub-end plate 42, the size of the second sub-end plate 42 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 outer shell 1, and preventing each single cell 2 from swelling, which would lead to a decrease in the cycle performance of the large-capacity battery.

[0108] In this embodiment, the second sub-end plate 42 is fixed to the first sub-end plate 41 by screw fixing, and a gasket 43 may be arranged between the first sub-end plate 41 and the second sub-end plate 42, and the screw head passes through the second sub-end plate 42 and the gasket 43 in sequence to connect with the first sub-end plate 41. At this time, the thickness of the entire end plate assembly 4 may also be adjusted by adjusting the thickness (dimension along the x direction) of the gasket 43 to clamp all the single cells 2.

Claims

1. A large capacity battery, characterized in that: It includes a housing and m single cells arranged in the housing, where m>1; the inner cavity of each single cell includes an electrolyte region and a gas region; The shell is provided with avoidance holes through which the polarity terminals of each single battery can extend; the polarity terminals of each single battery extend out of the corresponding avoidance holes, and the shell area around the avoidance holes is fixedly sealed with the shell of the single battery; The housing is provided with an electrolyte sharing chamber, a gas chamber and a functional interface; The electrolyte sharing chamber is connected to the electrolyte area of ​​each single cell; the gas chamber is connected to the gas area of ​​each single cell; The functional interface includes a columnar body, an explosion relief mechanism, a first blocking member and a second blocking member; The columnar body is provided with a liquid channel, a gas channel and an explosion relief channel; One end port of the liquid channel is connected to the electrolyte sharing chamber, and the other end port is provided with a first blocking member; One end port of the gas channel is connected to the gas chamber, and the other end port is provided with a second blocking member; One end of the explosion relief channel is connected to the gas chamber, and the other end is provided with an explosion relief mechanism.

2. The large-capacity battery according to claim 1, characterized in that: The shell includes a cylinder with open ends at both ends and end plate assemblies respectively fixed to the two open ends of the cylinder; The avoidance hole is opened on the top plate of the cylinder; The electrolyte sharing chamber is located on the bottom plate of the cylinder; the gas chamber is located on the top plate of the cylinder; The functional interface is located on one of the end plate components.

3. The large-capacity battery according to claim 2, 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.

4. The large-capacity battery according to claim 3, 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.

5. The large-capacity battery according to claim 4, 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.

6. The large-capacity battery according to claim 5, 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.

7. The large-capacity battery according to claim 6, characterized in that: The first blocking member is a plug provided with external threads; the first blocking member and the second blocking member have the same structure.

8. The large-capacity battery according to claim 7, characterized in that: The explosion relief mechanism is an explosion relief membrane.

9. An end plate assembly, characterized in that: It includes a first sub-end plate and a functional interface arranged on the first sub-end plate; The functional interface includes a columnar body, an explosion relief mechanism, a first blocking member and a second blocking member; The columnar body is provided with a liquid channel, a gas channel and an explosion relief channel; One end port of the liquid channel is connected to the electrolyte sharing chamber, and the other end port is provided with a first blocking member; One end port of the gas channel is connected to the gas chamber, and the other end port is provided with a second blocking member; One end of the explosion relief channel is connected to the gas chamber, and the other end is provided with an explosion relief mechanism.

10. An end plate assembly according to claim 9, characterized in that: The first sub-end plate is provided with a communication channel communicating with the gas channel or the electrolyte channel.

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