Liquid supplementing and replacing connecting assembly

Abstract

The utility model provides a liquid supplementing and replacing connecting assembly, which mainly solves the problem that the liquid supplementing and replacing device is inconvenient to open and seal holes due to the existing connecting mode of a high-capacity battery and the liquid supplementing and replacing device. The liquid supplementing and changing connecting assembly comprises a first liquid supplementing and changing connector and a second liquid supplementing and changing connector. The first liquid supplementing and changing connector is used for being installed on a large-capacity battery, and the second liquid supplementing and changing connector is used for being installed on a liquid supplementing and changing device; the first liquid supplementing and changing connector comprises a connector body; a first connecting flange is arranged on the outer wall of the connector body and divides the connector body into a connecting section and an inserting section. The second liquid supplementing and changing connector comprises a connecting sleeve, and a second connecting flange is arranged at the end of the connecting sleeve. The insertion section of the first liquid supplementing and changing connector is inserted into the connecting sleeve of the second liquid supplementing and changing connector, opposite insertion type positioning of the first liquid supplementing and changing connector and the second liquid supplementing and changing connector is achieved, and meanwhile fixed connection is achieved through the first connecting flange and the second connecting flange.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and in particular relates to a liquid replenishing and replacing connecting component. Background Art

[0002] With the further development of lithium-ion batteries in recent years, the application scenarios of lithium-ion batteries have become more and more extensive, especially some use scenarios that require relatively large battery capacity. For example: automotive power batteries, energy storage batteries that constitute household photovoltaic and energy storage integrated devices, and batteries that constitute energy storage systems for power plants.

[0003] When a lithium-ion battery is charged and discharged for a period of time, the electrolyte decomposes and consumes, resulting in reduced performance. Alternatively, when a lithium-ion battery is charged and discharged for a period of time, impurities appear in the electrolyte, affecting the performance of the lithium-ion battery.

[0004] At present, the performance of lithium-ion batteries can be improved by replenishing and replacing electrolytes through a fluid replenishment device. However, the fluid replenishment connectors reserved on existing large-capacity batteries are all threaded interfaces, and can only be connected to the fluid replenishment device by a threaded joint. After the threaded joint, the intermediate pipeline between the large-capacity battery and the fluid replenishment device is long, which makes it inconvenient for the fluid replenishment device to perform hole opening, fluid replenishment, and hole sealing operations on the large capacity. Summary of the invention

[0005] In order to solve the problem that the existing connection method between a large-capacity battery and a fluid replenishing and exchanging device is inconvenient for the fluid replenishing and exchanging device to perform hole opening, fluid replenishing and exchanging, and hole sealing operations, the utility model provides a fluid replenishing and exchanging connection assembly.

[0006] To solve the above problems, the technical solution of the utility model is:

[0007] A liquid replenishment connection assembly comprises a first liquid replenishment connector and a second liquid replenishment connector; the first liquid replenishment connector is used to be installed on a large-capacity battery, and the second liquid replenishment connector is used to be installed on a liquid replenishment device; the first liquid replenishment connector comprises a connector body, and a channel communicating with an inner cavity of the large-capacity battery is provided 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 liquid replenishment connector comprises a connecting sleeve, and a second connecting flange is provided at the end of the connecting sleeve; the insertion section of the first liquid replenishment connector is inserted into the connecting sleeve of the second liquid replenishment connector, so as to realize the plug-in positioning of the first liquid replenishment connector and the second liquid replenishment connector, and at the same time, the first liquid replenishment connector and the second liquid replenishment connector are fixedly connected through the first connecting flange and the second connecting flange.

[0008] Furthermore, 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; and a first sealing ring is provided between the first sealing boss and the second sealing boss.

[0009] Furthermore, an annular boss connected to the first connecting flange is also provided on the insertion section of the joint body, and the radial end surface of the annular boss away from the first connecting flange is the first sealing surface; an annular notch is provided on the inner wall of the connecting sleeve, 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.

[0010] Furthermore, an annular limiting boss is provided on the connecting section of the connector body, and the annular limiting boss is used to cooperate with the large-capacity battery to achieve the fixation of the first liquid replacement connector.

[0011] Furthermore, an annular chamfer is provided at the end of the joint body insertion section.

[0012] Furthermore, the channel in the first replacement fluid connector includes a first channel and a second channel that are isolated from each other, the first channel is used to communicate with the electrolyte area of ​​the large-capacity battery, and the second channel is used to communicate with the gas area of ​​the large-capacity battery.

[0013] Furthermore, the first channel is connected to an electrolyte pipe section, and the first channel is connected to the electrolyte area of ​​the large-capacity battery through the electrolyte pipe section. The first channel and the second channel are L-shaped flow channels.

[0014] Furthermore, a sealing channel communicating with the channel is provided on the joint body, and a rubber ring is provided in the sealing channel.

[0015] Further, said.

[0016] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0017] 1. The replenishing fluid connection assembly provided by the utility model includes a first replenishing fluid connector and a second replenishing fluid connector; the insertion section of the first replenishing fluid connector is inserted into the connecting sleeve of the second replenishing fluid connector to realize the plug-in connection of the first replenishing fluid connector and the second replenishing fluid connector. After the connection, part of the pipeline of the first replenishing fluid connector and the second replenishing fluid connector overlaps, which can effectively reduce the pipeline length between the large-capacity battery and the replenishing fluid device, so as to facilitate the replenishing fluid device to perform related operations on the large-capacity battery. At the same time, the insertion section of the first replenishing fluid connector is inserted into the connecting sleeve of the second replenishing fluid connector to realize the plug-in positioning installation of the first replenishing fluid connector and the second replenishing fluid connector, and the positioning of the first replenishing fluid connector and the second replenishing fluid connector is more reliable, and the sealing between the first replenishing fluid connector and the second replenishing fluid connector can also be improved. The first replenishing fluid connector and the second replenishing fluid 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 replenishing fluid device and the large-capacity battery.

[0018] 2. In the replacement fluid connection assembly of the utility model, 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.

[0019] 3. In the replacement fluid connection assembly of the present invention, 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 realize the accurate installation of the first replacement fluid connector and is also convenient for sealing the connection between the first replacement fluid connector and the large-capacity battery.

[0020] 4. In the replacement fluid connection assembly of the present invention, 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.

[0021] 5. In the replacement fluid connection assembly of the utility model, the channel in the first replacement fluid connector includes a first channel and a second channel that are isolated from each other. The first channel is used to communicate with the electrolyte area of ​​the large-capacity battery, and the second channel is used to communicate with the gas area of ​​the large-capacity battery. During the replacement fluid process, the second channel connects the gas area of ​​the large-capacity battery cavity with the inner cavity of the replacement fluid device, and the internal pressure of the large-capacity battery is changed through the second channel, so that the electrolyte flows smoothly during the replacement fluid process, and the electrolyte can also fully infiltrate the pole pieces of each single cell in the large-capacity battery.

[0022] 6. In the liquid replenishment and replacement connection assembly of the utility model, an electrolyte pipe section is connected to the first channel, and the electrolyte pipe section is always immersed in the electrolyte area of ​​the large-capacity battery. When the liquid needs to be replaced, as much electrolyte as possible in the inner cavity of the large-capacity battery can be drawn out, so that the liquid replacement is more thorough.

[0023] 7. In the replacement fluid connection assembly of the utility model, a sealing channel communicating with the channel is also provided on the joint body, and a rubber ring is provided in the sealing channel. When the sealing channel is blocked, the rubber ring is used to cooperate with the sealing plug to achieve reliable sealing of the sealing channel.

[0024] 8. In the replacement fluid connection assembly of the utility model, the first channel and the second channel are L-shaped channels, which facilitate the first channel and the second channel to be connected to the electrolyte area and the gas area of ​​the large-capacity battery respectively.

[0025] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the connection between a large-capacity battery and a liquid replenishing and replacing device in an embodiment;

[0028] Figure 2 An exploded view of the connection between a large-capacity battery and a liquid replenishing and replacing device in an embodiment;

[0029] Figure 3 A schematic diagram of the connection between a large-capacity battery and a first replacement fluid connector in an embodiment;

[0030] Figure 4 Schematic diagram of the connection between the liquid replenishing and exchanging device and the second liquid replenishing and exchanging connector in the embodiment;

[0031] Figure 5 is a cross-sectional view of the first replacement fluid connector and the second replacement fluid connector in the embodiment after being connected;

[0032] Figure 6 Schematic diagram of the first liquid replacement connector having an electrolyte pipe section in the embodiment;

[0033] Figure 7 It is a structural schematic diagram of the fluid replenishment and replacement device in the embodiment;

[0034] Figure 8 This is a schematic diagram of the structure of the liquid replenishing and replacing device (outer box body omitted) in the embodiment;

[0035] Fig. 9 The figure is a schematic diagram of the installation of the opening assembly in the fluid replenishment and replacement device of the embodiment;

[0036] Fig.10 Schematic diagram of the structure of the opening assembly in the fluid replenishment and replacement device of the embodiment;

[0037] Fig.11 Schematic diagram of the installation of the fluid replenishment and replacement component and the sealing component in the fluid replenishment and replacement device of the embodiment;

[0038] Fig.12 Schematic diagram of the structure of the fluid replenishment and replacement component in the fluid replenishment and replacement device of the embodiment;

[0039] Fig.13 Schematic diagram of the structure of the sealing assembly in the fluid replenishment and replacement device of the embodiment.

[0040] Figure numerals: 1-liquid replenishing and changing device, 2-large capacity battery, 3-first liquid replenishing and changing connector, 4-second liquid replenishing and changing connector, 11-outer box, 12-rotating component, 13-pushing component, 14-opening component, 15-liquid replenishing and changing component, 16-sealing component, 111-lower warehouse, 112-upper cover, 113-liquid replenishing and changing interface, 114-support plate, 115-guide sleeve, 121-turntable, 122-rotating shaft, 123-rotating motor, 124-screw, 125-bearing, 131-pushing motor, 132-pushing rod, 133-gear, 134-rack, 141-mounting sleeve, 142-mounting rod, 143-opening motor, 144-drill chuck, 145-spiral drill, 146-opening fixed Position spring, 151-liquid injection inner cylinder, 152-liquid injection outer cylinder, 153-liquid injection spring, 154-conical nozzle, 155-long strip through groove, 161-sealing spring, 162-sealing cylinder, 163-sealing push rod, 164-sealing plug, 31-connector body, 32-first connecting flange, 33-first sealing boss, 34-annular boss, 35-channel, 36-annular chamfer, 37-electrolyte pipe section, 38-annular limiting boss, 39-rubber ring, 341-first sealing surface, 351-first channel, 352-second channel, 41-connecting sleeve, 42-second connecting flange, 43-second sealing boss, 44-annular notch, 45-first sealing ring, 46-second sealing ring, 441-second sealing surface. DETAILED DESCRIPTION

[0041] 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.

[0042] The "other embodiments" that appear in different places in this specification do not all refer to the same embodiment, nor are they separate or selective embodiments that are mutually exclusive with other embodiments. In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of this utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically limited.

[0043] In the description of this specification, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] At the same time, in the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "top, bottom, inside and outside" 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, rather than indicating or implying 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 a limitation on the present invention.

[0045] In the existing use scenarios of lithium-ion batteries, in order to meet the larger capacity requirements, the current practice is to connect multiple single cells together in series and parallel to form a large-capacity battery. The large-capacity battery includes a plurality of single cells arranged in sequence, and the electrolyte area and gas area of ​​each single cell are connected through a shared chamber, so that each single cell is in a unified shared electrolyte and gas system, which reduces the differences between each single cell to a certain extent and improves the cycle life of the large-capacity battery. The above-mentioned shared chamber can be specifically formed by a hollow component or an outer shell to form large-capacity batteries of different structural forms. The following are large-capacity batteries of different structural forms:

[0046] 1. When formed by a hollow member, the specific structure of the large-capacity battery is detailed in Chinese Patent CN117477063A and Chinese Patent CN219892382U;

[0047] 2. When the shared chamber is formed by the outer shell, the specific structure of the large-capacity battery is as follows:

[0048] The large-capacity battery includes an outer shell and multiple single cells; the multiple single cells are placed side by side in the outer shell, and the top and bottom of the outer shell are respectively provided with shared chambers, wherein the shared chamber at the top is a gas shared chamber, and the shared chamber at the bottom is an electrolyte shared chamber, so that the gas area and the electrolyte area of ​​each single cell can be interconnected. A through hole is opened at the top of the outer shell at the position corresponding to the polarity terminal of each single cell; the polarity terminals of each single cell pass through the through hole to realize the parallel connection of each single cell.

[0049] Regardless of the above-mentioned structural form of large-capacity batteries, after a period of charge and discharge cycles, the electrolyte decomposes and consumes, and the electrolyte in the large-capacity batteries can no longer meet the requirements, resulting in a decrease in performance. At this time, the large-capacity battery can be replenished with electrolyte to improve the performance of the large-capacity battery; or, after a period of charge and discharge cycles, impurities appear in the electrolyte, resulting in a decrease in the performance of the large-capacity battery and a shortened cycle life. At this time, the large-capacity battery can be replaced with electrolyte to improve the performance of the large-capacity battery.

[0050] like Figure 1 and Figure 2 As shown, the utility model provides a liquid replenishment connection component, which is mainly used to realize the connection between the liquid replenishment device 1 and the large-capacity battery 2. The liquid replenishment device 1 generally includes an outer box body and an opening component, a liquid replenishment component and a sealing component arranged in the outer box body. The outer box body 11 is provided with a liquid replenishment interface for docking with the large-capacity battery 2. After the large-capacity battery 2 has worked for a period of time, the liquid replenishment device 1 can form an opening on the liquid replenishment connector on the large-capacity battery 2 and replenish electrolyte into the large-capacity battery 2 to improve the performance of the large-capacity battery 2. Alternatively, after the large-capacity battery 2 has been charged and discharged for a period of time, an opening is formed on the liquid replenishment connector on the large-capacity battery 2 to replace the electrolyte in the large-capacity battery 2. After completing the liquid replenishment or liquid replacement operation, the liquid replenishment device 1 can automatically seal the opening on the liquid replenishment connector of the large-capacity battery 2.

[0051] When the above-mentioned liquid replenishing and changing device 1 is connected to the large-capacity battery 2, not only the connection part is required to be detachable, but also the sealing of the connection part must be ensured. At the same time, after the connection, it is also necessary to ensure that the hole opening component and the hole sealing group in the liquid replenishing and changing device can smoothly perform the hole opening and hole sealing operations on the liquid replenishing and changing joint on the large-capacity battery 2.

[0052] like Figures 3 to 5As shown, this embodiment provides a liquid replenishment connection component, which includes a first liquid replenishment connector 3 and a second liquid replenishment connector 4; the first liquid replenishment connector 3 is used to connect with the large-capacity battery 2, and the second liquid replenishment connector 4 is used to connect with the liquid replenishment device 1. The first liquid replenishment connector 3 and the second liquid replenishment connector 4 are both provided with connecting flanges. When the first liquid replenishment connector 3 and the second liquid replenishment connector 4 are connected by flanges, part of the pipeline of the first liquid replenishment connector 3 can be inserted into the second liquid replenishment connector 4 to achieve a plug-in connection, effectively reducing the length of the intermediate pipeline between the large-capacity battery 2 and the liquid replenishment device, so as to facilitate the opening and sealing operations of the liquid replenishment device 1.

[0053] The structures of the first replenishment fluid connector 3 and the second replenishment fluid connector 4 are described in detail below.

[0054] like Figure 3 and Figure 5 As shown, the first replacement fluid connector 3 is installed on the large-capacity battery 2, including a connector body 31, the connector body 31 is used to be fixed on the large-capacity battery 2, and a channel 35 that penetrates the inner cavity of the large-capacity battery 2 is opened on the connector body 31; a first connecting flange 32 is arranged on the outer wall of the connector body 31, and the first connecting flange 32 divides the connector body 31 into a connecting section and an insertion section.

[0055] like Figure 4 and Figure 5 As shown, the second replacement fluid connector 4 is installed on the replacement fluid device, including a connecting sleeve 41, the connecting sleeve 41 is used to be fixed on the replacement fluid interface of the replacement fluid device 1, and the end of the connecting sleeve 41 is provided with a second connecting flange 42. It should be noted that the above-mentioned radial end face refers to the end face perpendicular to the axis of the first connecting flange 32 and the second connecting flange 42.

[0056] like Figure 5As shown, when the first liquid replenishing connector 3 and the second liquid replenishing connector 4 are connected, the insertion section of the first liquid replenishing connector 3 is inserted into the connection sleeve 41 of the second liquid replenishing connector 4, and then fixed by the first connection flange 32 and the second connection flange 42. The insertion section of the first liquid replenishing connector 3 is inserted into the connection sleeve 41 of the second liquid replenishing connector 4 to realize the plug-in connection of the first liquid replenishing connector 3 and the second liquid replenishing connector 4. After the connection, part of the pipeline of the first liquid replenishing connector 3 and the second liquid replenishing connector 4 overlaps, which can effectively reduce the length of the intermediate pipeline between the large-capacity battery and the liquid replenishing device, so as to facilitate the liquid replenishing device to open and seal the large-capacity battery. At the same time, the insertion section of the first liquid replenishing connector 3 is inserted into the connection sleeve 41 of the second liquid replenishing connector 4, which can also realize the plug-in positioning installation of the first liquid replenishing connector 3 and the second liquid replenishing connector 4, and the positioning of the first liquid replenishing connector 3 and the second liquid replenishing connector 4 is more reliable, and the sealing between the first liquid replenishing connector 3 and the second liquid replenishing connector 4 is improved. At the same time, the first liquid replenishing connector 3 and the second liquid replenishing connector 4 are connected through the first connecting flange 32 and the second connecting flange 42. This connection method does not require the large-capacity battery 2 and the liquid replenishing device 1 to rotate relative to each other, and the connection is very convenient.

[0057] like Figure 5 As shown, the radial end face of the first connecting flange 32 close to the insertion section has a first sealing boss 33, and the radial end face of the second connecting flange 42 away from the connecting sleeve 41 has a second sealing boss 43; a first sealing ring 45 is provided between the first sealing boss 33 and the second sealing boss 43, and the first sealing ring 45 is squeezed after the first connecting flange and the second connecting flange are connected by bolts, that is, it can achieve axial sealing at the sealing point, and can also achieve radial sealing at the sealing point.

[0058] like Figure 5 As shown, in order to further improve the connection sealing performance of the first replacement fluid connector 3 and the second replacement fluid connector 4, an annular boss 34 connected to the first connecting flange 32 is further provided on the insertion section of the connector body 31, and the radial end surface of the annular boss 34 away from the first connecting flange 32 is a first sealing surface 341; an annular notch 44 is provided on the inner wall of the connecting sleeve 41, and the radial end surface of the annular notch 44 away from the second connecting flange 42 is a second sealing surface 441; a second sealing ring 46 is provided between the second sealing boss 43 and the second sealing surface 441; the first sealing ring 45 and the second sealing ring 46 realize two seals at the connection between the first replacement fluid connector 3 and the second replacement fluid connector 4, so that after the large-capacity battery 2 is connected to the replacement fluid device 1, the sealing performance is very reliable.

[0059] like Figure 5As shown, in the first liquid replenishing connector 3, an annular limiting boss 38 is also provided on the connecting section of the connector body 31, and the annular limiting boss 38 is used to cooperate with the outer shell of the large-capacity battery 2 to achieve the fixation of the first liquid replenishing connector 3. A mounting hole is opened on the outer shell of the large-capacity battery 2, and the connector body 31 is fixed in the mounting hole. The annular limiting boss 38 is welded to the outer shell area around the mounting hole to achieve the fixation and seal the mounting hole. This connection method can realize the accurate installation of the first liquid replenishing connector 3, and is also convenient for achieving the sealing of the connection between the first liquid replenishing connector 3 and the large-capacity battery 2.

[0060] like Figure 5 As shown, in addition, in the above-mentioned first liquid replenishing connector 3, an annular chamfer 36 is provided on the end face of the connector body 31 in the first liquid replenishing connector 3 that is inserted into the second liquid replenishing connector 4. The annular chamfer 36 has a guiding and positioning function, which facilitates the insertion of the first liquid replenishing connector 3 and the second liquid replenishing connector 4.

[0061] In this embodiment, if Figure 5 As shown, the channel 35 in the first liquid replacement connector 3 includes a first channel 351 and a second channel 352 that are isolated from each other. The first channel 351 is used to communicate with the electrolyte area of ​​the large-capacity battery 2, and the second channel 352 is used to communicate with the gas area of ​​the large-capacity battery 2. During the liquid replacement process, the second channel 352 connects the gas area of ​​the inner cavity of the large-capacity battery 2 with the inner cavity of the liquid replacement device. Through the second channel 352, the internal pressure of the battery is changed, so that the electrolyte flows smoothly during the liquid replacement process, and the electrolyte can also fully infiltrate the pole pieces of each single battery.

[0062] In other embodiments, the channel 35 provided on the connector body 31 may be a single channel, which is connected to the electrolyte area in the large-capacity battery 2 , and the large-capacity battery 2 is replenished and replaced with electrolyte through the channel 35 .

[0063] The first channel 351 and the second channel 352 in this embodiment can be circular straight through holes or L-shaped through holes. It is only necessary to ensure that the first channel 351 and the second channel 352 are respectively connected to the electrolyte area and the gas area in the large-capacity battery 2. In this embodiment, since the gas area of ​​the large-capacity battery 2 is generally above the outer shell, and the electrolyte is generally below the outer shell, at this time, the first channel 351 and the second channel 352 are preferably L-shaped flow channels, which facilitate the first channel 351 and the second channel 352 to be connected to the electrolyte area and the gas area of ​​the large-capacity battery 2 respectively.

[0064] like Figure 6As shown, the first channel 351 can also be connected to the electrolyte area of ​​the large-capacity battery 2 through the electrolyte tube segment 37. The end of the electrolyte tube segment 37 connected to the electrolyte area of ​​the inner cavity of the shell can be directly extended into the bottom of the inner cavity of the large-capacity battery shell and is always immersed in the electrolyte. When the liquid needs to be replaced, as much electrolyte as possible in the inner cavity of the shell can be extracted, so that the liquid replacement is more thorough.

[0065] The above-mentioned electrolyte pipe section 37 and the connector body 31 can be an integral part or a separate part. When it is a separate part, it can be connected to the connector body 31 by welding or screwing, or it can be connected to the electrolyte pipe section 37 by a quick-plug connector; the material of the electrolyte pipe section 37 is generally selected from the same aluminum material as the connector body 31.

[0066] In addition, if Figure 5 As shown, in order to facilitate the blocking of the channel 35 in the first replacement fluid connector 3, a sealing channel that is connected to the channel 35 is further provided on the connector body 31, and a rubber ring 39 is provided in the sealing channel. When the sealing channel is blocked, the rubber ring 39 is used to cooperate with the sealing plug 164 to achieve reliable sealing of the sealing channel. The rubber ring 39 is generally made of a rubber material that does not react with the electrolyte, such as fluororubber, nitrile rubber, natural rubber or EPDM rubber.

[0067] The above-mentioned fluid replenishment and replacement connection assembly can realize a reliable connection between the fluid replenishment and replacement device 1 and the large-capacity battery 2, so that the fluid replenishment and replacement device 1 can perform fluid replenishment and replacement operations on the large-capacity battery 2, thereby improving the performance of the large-capacity battery 2. The specific structure of the fluid replenishment and replacement device 1 is as follows.

[0068] like Figure 7 As shown, the above-mentioned fluid replacement device 1 includes an outer box body 11 and a rotating component 12, a pushing component 13, a hole opening component 14, a fluid replacement component 15 and a hole sealing component 16 arranged in the outer box body 11; the rotating component 12 can rotate along a set axis, the hole opening component 14, the fluid replacement component 15 and the hole sealing component 16 are all connected to the rotating component 12, and can rotate with the rotating component 12, the pushing component 13 is arranged on the same side of the hole opening component 14, the fluid replacement component 15 and the hole sealing component 16, and can provide linear thrust when the hole opening component 14, the fluid replacement component 15 and the hole sealing component 16 perform corresponding operations such as hole opening, fluid replacement and hole sealing. The outer box body 11 is provided with a liquid replacement interface 113 for docking with the large-capacity battery 2, and the hole opening, liquid replacement and hole sealing operations are all performed through the liquid replacement interface 113; when performing the liquid replacement operation, the liquid replacement interface 113 on the outer box body 11 is connected to the large-capacity battery 2, and then the above-mentioned hole opening component 14, liquid replacement component 15 and hole sealing component 16 are rotated to the liquid replacement interface 113 under the operation of the rotating component 12, and the corresponding hole opening, liquid replacement and hole sealing operations are realized under the operation of the pushing component 13.

[0069] The specific structures and connection relationships of the components such as the outer box body 11, the rotating component 12, the pushing component 13, the hole opening component 14, the liquid replenishing component 15 and the hole sealing component 16 are described in detail below.

[0070] like Figure 7 As shown, the outer box body 11 includes a lower bin body 111 and an upper cover 112. The lower bin body 111 is a box structure with a semicircular opening on the top. The lower bin body 111 is provided with a liquid replenishment interface 113 connected to the large-capacity battery 2. In addition, at least one support plate 114 is provided in the lower bin body 111 to stably support the rotating assembly 12, the pushing assembly 13, the opening assembly 14, the liquid replenishment assembly 15 and the sealing assembly 16, etc. The support plate 114 is generally arranged parallel to the front plate and the rear plate of the lower bin body 111. The upper cover 112 is an arc-shaped cover plate, which is arranged at the open end of the lower bin body 111. The lower bin body 111 and the upper cover 112 form a closed space, which is generally filled with an inert gas to provide an environment isolated from the external air when the components inside are working.

[0071] like Figure 7 and Figure 8 As shown, the rotating component 12 is mainly used to drive the hole opening component 14, the liquid replenishing component 15 and the hole sealing component 16 to rotate, and rotate the hole opening component 14, the liquid replenishing component 15 and the hole sealing component 16 to the liquid replenishing interface 113 respectively in turn to perform corresponding hole opening, liquid replenishing, hole sealing and other operations.

[0072] The rotating assembly 12 includes at least one turntable 121 and a rotation drive unit, and the rotation drive unit is mainly used to drive the turntable 121 to rotate. The hole opening assembly 14, the liquid replacement assembly 15 and the hole sealing assembly 16 are all installed on the turntable 121. Under the operation of the rotation drive unit, the turntable 121 can rotate the hole opening assembly 14, the liquid replacement assembly 15 and the hole sealing assembly 16 to the liquid replacement interface 113 in sequence. There are two turntables 121, including a front turntable and a rear turntable, wherein the front turntable is arranged on the side of the outer box 11 where the liquid replacement interface 113 is arranged, and the rear turntable is arranged on the side of the outer box 11 away from the liquid replacement interface 113, and the two ends of the hole opening assembly 14, the liquid replacement assembly 15 and the hole sealing assembly 16 are respectively connected to the front turntable and the rear turntable. At the same time, the front turntable and the rear turntable can also be fixed by multiple screws 124, and the multiple screws 124 are evenly distributed along the circumference of the turntable 121 to make the structure of the entire rotating assembly 12 more stable.

[0073] The above-mentioned rotation drive unit includes a rotation shaft 122 and a rotation motor 123; the rotation motor 123 is arranged on one side of the rear turntable, connected to the rotation shaft 122 through a coupling, the rotation shaft 122 passes through the front turntable and the rear turntable, and is fixedly connected to the front turntable and the rear loading plate. When the rotation motor 123 is working, it drives the rotation shaft 122 to rotate. At this time, the rotation shaft 122 drives the front turntable and the rear turntable to rotate synchronously, so as to rotate the opening assembly 14, the replacement fluid assembly 15 and the sealing assembly 16 on the turntable 121 to the replacement fluid interface 113 of the outer box body 11. In addition, bearings 125 are arranged between the two ends of the rotation shaft 122 and the outer box body 11, so that the entire rotation assembly 12 is installed on the outer box body 11.

[0074] like Figure 7 and Fig. 9 As shown, the push assembly 13 is arranged in the outer box body 11, and is arranged on the same side of the hole opening assembly 14, the liquid replenishing assembly 15, and the hole sealing assembly 16, to provide a linear thrust, which is mainly used to drive the hole opening assembly 14, the liquid replenishing assembly 15, and the hole sealing assembly 16 to move toward the large-capacity battery 2 after the hole opening assembly 14, the liquid replenishing assembly 15, and the hole sealing assembly 16 rotate to the liquid replenishing interface 113 of the outer box body 11, so as to complete the corresponding hole opening, liquid replenishing and hole sealing operations.

[0075] The push assembly 13 includes a push motor 131, a push rod 132 and a gear rack assembly; the output shaft of the push motor 131 is connected to the gear 133 in the gear rack assembly, driving the gear 133 to rotate, the gear 133 rotates and drives the rack 134 to do linear motion, the push rod 132 is connected to the rack 134, and the push rod 132 applies a linear thrust under the drive of the rack 134. This enables the hole opening assembly 14, the liquid replacement assembly 15 and the hole sealing assembly 16 to move toward the large-capacity battery 2, pass through the liquid replacement interface 113 on the outer box body 11, and perform subsequent hole opening, liquid replacement and hole sealing operations.

[0076] In addition, if Figure 7 As shown, a guide sleeve 115 is provided on the support plate 114 in the outer box body 11. The guide sleeve 115 is fixed to the side of the support plate 114 away from the turntable 121. The push rod 132 passes through the guide sleeve 115 to apply thrust. The guide sleeve 115 not only provides a certain guide for the movement of the push rod 132, but also supports the push rod 132 to prevent the push rod 132 from disengaging from the gear 133 when the movement amount is too large.

[0077] like Figure 7 , Fig. 9 and Fig.10As shown, the hole opening assembly 14 in this embodiment is mainly used to remove the sealing plug on the large-capacity battery 2 to open the replacement fluid connector of the large-capacity battery 2, so as to facilitate the subsequent replacement fluid operation. The hole opening assembly 14 includes a mounting sleeve 141, a mounting rod 142 and a hole opening unit; the hole opening unit includes a hole opening motor 143, a drill chuck 144 and a spiral drill bit 145, and the hole opening motor 143 is connected to the spiral drill bit 145 through the drill chuck 144.

[0078] The mounting sleeve 141 is fixedly mounted on the end surface of the rear turntable, and the mounting rod 142 is sleeved in the mounting sleeve 141, one end of which is used to connect with the push rod 132 of the push assembly 13, and the other end extends out of the mounting sleeve 141 and is fixedly connected with the outer shell of the hole opening motor 143. The mounting rod 142 cooperates with the mounting sleeve 141 to install the hole opening unit on the rear turntable. At the same time, the mounting rod 142 transmits the linear thrust on the push rod 132 to the hole opening motor 143, and the push rod 132 pushes the entire hole opening unit to move toward the direction of the large-capacity battery.

[0079] While the pushing assembly 13 applies a linear thrust to the hole-opening unit, the hole-opening motor 143 works, so that the spiral drill bit 145 can rotate along the axis. Under the joint action of the pushing assembly 13 and the hole-opening motor 143, the spiral drill bit 145 moves forward and rotates until the spiral drill bit 145 is spirally inserted into the sealing plug of the large-capacity battery 2. Then, the hole-opening motor 143 stops working, and the pushing assembly 13 applies a force in the reverse direction to pull out the sealing plug. Then, the replacement fluid connector of the large-capacity battery 2 is opened, forming a channel connected to the inner cavity of the large-capacity battery 2.

[0080] In addition, the hole opening assembly 14 also includes a hole opening positioning spring 146, which is mounted on the spiral drill bit 145 and is used to control the feed amount of the spiral drill bit 145. Under the force of the hole opening positioning spring 146, the movement of the spiral drill bit 145 is relatively gentle and stable, avoiding sudden movement and damage to the spiral drill bit 145. At the same time, the hole opening positioning spring 146 can provide a force after the hole opening operation is completed, and work together with the push assembly 13 to pull out the sealing plug. At the same time, the hole opening motor 143, the drill chuck 144 and the spiral drill bit 145 can also be restored to the initial position, and the replacement fluid connector of the large-capacity battery 2 is withdrawn to facilitate the next operation.

[0081] like Fig.11 and Fig.12As shown, the liquid replenishment and replacement assembly 15 mainly performs liquid replenishment or liquid replacement operations on the large-capacity battery 2 after completing the hole opening operation. The liquid replenishment and replacement assembly 15 mainly includes a liquid injection inner cylinder 151, a liquid injection outer cylinder 152 and a liquid injection spring 153; the two ends of the above-mentioned liquid injection outer cylinder 152 are respectively connected to the front turntable and the rear turntable, and the liquid injection inner cylinder 151 is arranged in the liquid injection outer cylinder 152, which is used to connect with the external pipeline. After the entire liquid replenishment and replacement assembly 15 rotates to the liquid replenishment and replacement interface 113, the push assembly 13 will push the liquid injection inner cylinder 151 to connect with the liquid replenishment and replacement joint of the large-capacity battery 2 to perform operations such as air extraction, liquid injection or liquid extraction. In addition, it should be noted that since the liquid injection inner cylinder 151 needs to move axially relative to the liquid injection outer cylinder 152, a long strip through groove 155 is provided on the liquid injection outer cylinder 152, so that the liquid injection inner cylinder 151 and the hose of the external pipeline can move in the long strip through groove 155.

[0082] like Fig.12 As shown, the injection spring 153 is arranged in the injection outer cylinder 152, and provides a force to return the injection inner cylinder 151 to the initial position after the injection inner cylinder 151 completes the relevant operation. In this embodiment, the injection spring 153 is installed in the following manner: the injection inner cylinder 151 is set as a variable diameter cylinder, and the injection spring 153 is mounted on a cylinder body with a smaller size of the variable diameter cylinder.

[0083] In addition, in order to ensure the sealing of the connection between the liquid injection inner cylinder 151 and the replacement fluid joint of the large-capacity battery 2, a conical nozzle 154 is provided at the end of the liquid injection inner cylinder 151, and the liquid injection inner cylinder 151 is sealedly connected to the replacement fluid joint channel of the large-capacity battery 2 through the conical nozzle 154.

[0084] like Fig.11 and Fig.13As shown, the sealing assembly 16 in this embodiment mainly seals the passage on the fluid replacement joint of the large-capacity battery 2 with a sealing plug 164 after the fluid replacement is completed. The sealing assembly 16 includes a sealing spring 161, a sealing cylinder 162, and a sealing push rod 163; the two ends of the sealing cylinder 162 are respectively connected to the front turntable and the rear turntable, and the sealing push rod 163 is arranged in the sealing cylinder 162, which can push the sealing plug 164 under the action of the pushing assembly 13, so that the sealing plug 164 is squeezed into the passage on the fluid replacement joint of the large-capacity battery 2, thereby sealing the fluid replacement joint of the large-capacity battery 2. The above-mentioned sealing plug 164 generally adopts a rubber sealing plug or a plastic sealing plug, which can be made into a conical structure with a smaller size at one end and a larger size at the other end, so as to quickly and accurately enter the passage of the fluid replacement joint. At the same time, the size of the large end of the sealing plug is slightly larger than the size of the fluid replacement joint passage, so that the sealing plug 164 can reliably seal the passage of the fluid replacement joint. After the sealing plug 164 is pushed into the channel of the replacement fluid connector, sealant can be applied to the sealing plug 164 and the replacement fluid connector after the entire replacement fluid device is separated from the large-capacity battery to further improve the reliability of the seal.

[0085] The above-mentioned sealing spring 161 is arranged in the sealing cylinder 162, and provides a force to return the sealing push rod 163 to the initial position after the sealing push rod 163 completes the sealing operation. In this embodiment, the sealing spring 161 is installed in the following manner: the sealing spring 161 is sleeved on the sealing push rod 163, one end of which is limited by an annular step arranged on the inner wall of the sealing cylinder 162, and the other end is limited by a baffle arranged on the sealing push rod 163. At the same time, in order to facilitate the sealing push rod 163 to push the sealing plug 164, a push plate can also be installed at the end of the sealing push rod 163, so that the sealing push rod 163 can apply a more uniform force to the sealing plug 164, so as to push the sealing plug 164 outward as a whole.

[0086] The working process of the liquid replenishing device 1 for replenishing the large-capacity battery 2 is as follows:

[0087] S1, connection;

[0088] Connect the first replacement fluid connector 3 on the large-capacity battery 2 and the second replacement fluid connector 4 on the replacement fluid device 1;

[0089] S2, opening;

[0090] The rotary drive unit drives the turntable 121 to rotate, and the turntable 121 drives the opening assembly 14 to rotate to the position of the replacement fluid interface 113 of the outer box body 11;

[0091] The pushing motor 131 in the pushing assembly 13 is turned on, and the pushing rod 132 pushes the hole-opening unit forward until the spiral drill bit 145 in the hole-opening unit contacts the first replacement fluid connector 3 of the large-capacity battery 2. At the same time, the hole-opening motor 143 works, and the spiral drill bit 145 opens the first replacement fluid connector 3 of the large-capacity battery 2 under the action of the hole-opening motor 143, forming a channel connected to the inner cavity of the large-capacity battery 2; after the hole-opening is completed, the pushing motor 131 in the pushing assembly 13 rotates in the opposite direction, and the pushing assembly 13 moves backward as a whole and returns to its initial position; at this time, under the action of the hole-opening positioning spring 146, the hole-opening unit withdraws from the replacement fluid interface 113 of the outer box body 11 and returns to its initial position;

[0092] S3, replenishing the fluid;

[0093] The rotary drive unit drives the turntable 121 to rotate, and rotates the liquid replenishment and replacement assembly 15 to the position of the liquid replenishment and replacement interface 113 of the outer box body 11, and at the same time, the liquid injection inner cylinder 151 is connected to the external pipeline through the connecting hose;

[0094] The pushing motor 131 in the pushing assembly 13 is turned on, and the pushing rod 132 pushes the liquid replacement assembly 15 forward until the liquid injection inner cylinder 151 is connected to the channel on the first liquid replacement joint 3 of the large-capacity battery 2, and then the large-capacity battery 2 is subjected to liquid replacement operations such as liquid injection or liquid discharge; after the liquid replacement is completed, the pushing motor 131 in the pushing assembly 13 rotates in the opposite direction, and the pushing assembly 13 moves backward as a whole and returns to its initial position. At this time, under the action of the liquid injection spring 153, the liquid injection inner cylinder 151 withdraws from the liquid replacement interface 113 of the outer box body 11 and returns to its initial position;

[0095] S4, sealing the hole;

[0096] The rotary drive unit drives the turntable 121 to rotate, and rotates the sealing assembly 16 to the position of the liquid replenishment interface 113 of the outer box body 11;

[0097] The push assembly 13 is opened, and the sealing assembly 16 is pushed forward. Under the action of the push assembly 13, the sealing assembly 16 squeezes the sealing plug 164 into the channel on the first replacement fluid connector 3 of the large-capacity battery 2 to seal the first replacement fluid connector 3. After the sealing operation is completed, the push motor 131 in the push assembly 13 rotates in the opposite direction, and the push assembly 13 moves backward as a whole and returns to the initial position. At this time, under the action of the sealing spring 161, the sealing push rod 163 returns to the initial position;

[0098] S5, disassembly and separation;

[0099] The first replacement fluid connector 3 on the large-capacity battery 2 and the second replacement fluid connector 4 on the replacement fluid device 1 are disassembled and separated;

[0100] Apply sealant to the sealing plug 164 and the replacement fluid joint to further improve the reliability of the seal.

Claims

1. A liquid replacement connection assembly, characterized in that: It 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, on which a passage is provided which is communicated with the inner cavity of the large-capacity battery; on the outer wall of the connector body, a first connecting flange is provided, 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 replenishing fluid connector is inserted into the connecting sleeve of the second replenishing fluid connector to realize the plug-in positioning of the first replenishing fluid connector and the second replenishing fluid connector. At the same time, the first replenishing fluid connector and the second replenishing fluid connector are fixedly connected through the first connecting flange and the second connecting flange.

2. The replacement fluid connection assembly according to claim 1, 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.

3. The replacement fluid connection assembly according to claim 2, 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.

4. The replacement fluid connection assembly according to claim 1, 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.

5. The replacement fluid connection assembly according to claim 1, characterized in that: The end of the joint body insertion section is provided with an annular chamfer.

6. The replacement fluid connection assembly according to any one of claims 1 to 5, characterized in that: The channel in the first replacement fluid connector includes a first channel and a second channel that are isolated from each other, the first channel is used to communicate with the electrolyte area of ​​the large-capacity battery, and the second channel is used to communicate with the gas area of ​​the large-capacity battery.

7. The replacement fluid connection assembly according to claim 6, characterized in that: The first channel is connected to an electrolyte pipe section, and the first channel is connected to the electrolyte area of ​​the large-capacity battery through the electrolyte pipe section.

8. The replacement fluid connection assembly according to claim 7, 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.

9. The replacement fluid connection assembly according to claim 8, characterized in that: The first channel and the second channel are L-shaped flow channels.

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