High-capacity battery assembly

Abstract

The utility model belongs to the field of batteries, and particularly relates to a high-capacity battery assembly which comprises a high-capacity battery and a heat exchange device, the high-capacity battery comprises a shell and a plurality of single batteries arranged in an inner cavity of the shell along the x direction; the shell is provided with at least one shared cavity communicated with inner cavities of all the single batteries; an avoiding hole is formed in the top plate of the shell; the polar terminal of each single battery extends out of the avoiding hole; the heat exchange device comprises a plurality of heat exchange sleeves in one-to-one correspondence with the polar terminals; each heat exchange sleeve is arranged on the periphery of the corresponding polarity terminal in a sleeving mode, and an annular cavity is formed between the inner side wall of each heat exchange sleeve and the side wall of the corresponding polarity terminal and serves as a heat exchange medium flowing cavity. The electric connection part of the polar terminal extends out of the heat exchange sleeve; the top opening end and the bottom opening end of the heat exchange sleeve are sealed with the side wall of the polarity terminal; and the heat exchange sleeves on the polarity terminals on the same side of the adjacent single batteries are communicated. By optimizing the heat exchange structure, the heat exchange path is shortened, the heat exchange area is increased, and the heat exchange performance of the high-capacity battery is improved.

Description

Technical Field

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

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

[0003] However, existing large-capacity batteries have inherent differences among individual cells. Due to the "barrel effect," the performance of the worst cell is often affected, significantly limiting the upper capacity and cycle life of the entire large-capacity battery. Therefore, improving the uniformity of individual cells in large-capacity batteries has become a key and challenging area of ​​research in this field.

[0004] In order to solve the above problems, Chinese patent CN220797038U discloses a large-capacity battery, the structure of which is as follows: Figure 1 As shown, such a large-capacity battery includes a housing 3 and a plurality of single cells.

[0005] The length direction of the housing 3 is defined as the x direction, the width direction as the y direction, and the height direction as the z direction;

[0006] Multiple single cells are arranged in the inner cavity of the housing 3 along the x direction;

[0007] The bottom plate 32 of the outer shell is provided with an electrolyte sharing chamber 33, which is connected to the electrolyte area of ​​the inner cavity of each single cell; the electrolyte in the inner cavity of each single cell is connected through the electrolyte sharing chamber 33, so that the electrolyte of all single cells is in the same system, reducing the difference between the electrolytes of each single cell, and to a certain extent improving the consistency between the single cells, thereby to a certain extent improving the cycle life of the large-capacity battery.

[0008] The housing top plate 31 is provided with avoidance holes 311 for extending the polarity terminals 21 of each single battery; each single battery polarity terminal 21 extends out of the avoidance holes 311 and the housing top plate 31 area corresponding to the avoidance holes 311 is fixedly sealed with the upper cover plate of the single battery.

[0009] It should be noted that the above-mentioned single cell polarity terminal 21 can be a single cell pole. If, in order to avoid the single cell pole as a polarity terminal 21 from being unable to smoothly extend out of the avoidance hole 311 or the height of the single cell pole extending out of the avoidance hole 311 does not meet the set requirements, 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 21.

[0010] The above-mentioned large-capacity batteries will release heat during use. If the heat exchange is not timely, the battery life will be greatly shortened, energy loss will be aggravated, and even safety hazards such as spontaneous combustion and fire will occur. Therefore, it is particularly important to improve the heat exchange efficiency of the above-mentioned large-capacity batteries.

[0011] In order to improve the heat exchange efficiency of the above-mentioned large-capacity battery, Chinese patent CN118299714A discloses a large-capacity battery, such as Figure 2 As shown, the patent provides a slot at the location of the polarity terminal 21 where the large-capacity battery extends out of the avoidance hole 311. The heat exchange element 01 is fixed in the slot, effectively achieving heat exchange for the large-capacity battery. The larger the contact area between the polarity terminal 21 and the heat exchange element 01, the better the heat exchange effect. In other words, the larger the slot surface area, the larger the contact area between the polarity terminal 21 and the heat exchange element 01, and the better the heat exchange effect achieved. However, if the slot surface area is too large, it will affect the overall structure of the polarity terminal 21, and thus its conductivity. Summary of the Invention

[0012] The purpose of the utility model is to provide a large-capacity battery assembly, which improves the heat exchange performance of the entire large-capacity battery by optimizing the heat exchange structure, shortening the heat exchange path, and increasing the heat exchange area without affecting the conductive performance of the polarity terminals.

[0013] The technical solution of the utility model is to provide a large-capacity battery assembly, including a large-capacity battery and a heat exchange device;

[0014] The high-capacity battery includes a housing and multiple single cells; the multiple single cells are arranged in the inner cavity of the housing along the x-direction, and the housing has at least one shared chamber, the inner cavity of the shared chamber is connected to the inner cavity of all the single cells; the top plate of the housing has avoidance holes corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the area of ​​the top plate of the housing corresponding to the avoidance holes is fixedly sealed to the outer shell of the single cell;

[0015] The heat exchange device includes multiple heat exchange sleeves, each of which corresponds to a polarity terminal. Each heat exchange sleeve is respectively mounted on the periphery of the corresponding polarity terminal, and an annular cavity is formed between the inner side wall of the heat exchange sleeve and the side wall of the polarity terminal. The annular cavity serves as a flow chamber for the heat exchange medium. The electrical connection portion of the polarity terminal extends out of the heat exchange sleeve. The top open end and the bottom open end of the heat exchange sleeve are sealed from the side wall of the polarity terminal.

[0016] The heat exchange sleeves of adjacent single cells located on the polarity terminals on the same side are connected to each other.

[0017] The heat exchange device of the utility model includes multiple heat exchange sleeves, one of which is positioned around each polarity terminal. The annular cavity formed between the inner wall of each heat exchange sleeve and the side wall of the polarity terminal serves as a flow chamber for the heat exchange medium. The polarity terminal extends out of the heat exchange sleeve in the z-direction, meaning that part of the polarity terminal's structure is located within the heat exchange sleeve, in direct contact with the insulating heat exchange medium. Another part of the polarity terminal's structure is located outside the heat exchange sleeve, serving as an electrical connection. The heat exchange sleeves on the same side of each single battery are connected, forming two heat exchange channels on top of the high-capacity battery. These two heat exchange channels can be connected in parallel or in series, enabling heat exchange within the high-capacity battery.

[0018] Compared with the solution of Chinese patent CN118299714A, firstly, the heat exchange path is shortened from "heat exchange medium-heat exchange element-polarity terminal" to "heat exchange medium-polarity terminal". The heat exchange medium directly acts on the polarity terminal, which can improve the utilization efficiency of the heat exchange medium and thus improve the heat exchange efficiency of such large-capacity batteries; secondly, the heat exchange area is increased from "a slot with a certain surface area" to "a partial structure where the polarity terminal is located in the heat exchange device", which can further improve the heat exchange efficiency of such large-capacity batteries.

[0019] Furthermore, an insulating member is provided on the polarity terminal of each single cell, and the polarity terminal is insulated from the upper cover of the single cell by the insulating member;

[0020] The heat exchange sleeve includes a hollow member and an annular sealing plate; two through holes are provided on the side wall of the hollow member, which penetrate the inner cavity and serve as a liquid inlet and a liquid outlet respectively; the annular sealing plate is coaxial with the hollow member and is sealed and fixed to the top of the hollow member;

[0021] The heat exchange sleeve is mounted on the polarity terminal, and the inner sidewall of the bottom end of the hollow member of the heat exchange sleeve is sealed and fixed to the outer sidewall of the insulating member. The inner ring surface of the annular sealing plate of the heat exchange sleeve is sealed and fixed to the sidewall of the polarity terminal. The electrical connection portion of the polarity terminal extends out of the inner hole of the annular sealing plate. An annular cavity is formed between the heat exchange sleeve and the polarity terminal, and the annular cavity serves as a flow chamber for the heat exchange medium.

[0022] The liquid inlet and the liquid outlet of the heat exchange sleeve of the adjacent single cells located on the polarity terminals on the same side are connected to each other.

[0023] Furthermore, the heat exchange sleeve further comprises a liquid inlet pipe and a liquid outlet pipe; the liquid inlet pipe and the liquid outlet pipe are both fixed on the side wall of the hollow component and are respectively connected to the liquid inlet and the liquid outlet;

[0024] The heat exchange sleeves of adjacent single cells located on the polarity terminals on the same side are connected to each other through a liquid inlet pipe and a liquid outlet pipe.

[0025] Furthermore, the hollow member, annular sealing plate, liquid inlet pipe, and liquid outlet pipe are all integrated into a single piece, all made of rubber. Compared to separate structures, integrated pieces are easier to process. The rubber heat exchange sleeve, due to its elastic deformation, is easily fitted over the polarity terminal and easily seals against the sidewalls of the polarity terminal and the outer wall of the insulating member.

[0026] Furthermore, a limiting rib is provided on the inner side wall of the hollow component along its axial direction, and the lower end surface of the limiting rib abuts against the upper end surface of the insulating component to limit the hollow component in the axial direction of the hollow component.

[0027] Furthermore, a stepped structure is provided along the circumference of the outer wall of the insulating member. The inner wall of the bottom end of the hollow member is sealed and fixed to the outer wall of the insulating member, and the bottom end face of the hollow member is sealed and fixed to the stepped surface of the insulating member. The stepped surface not only supports the heat exchange sleeve but also achieves a sealed fixation between the bottom end of the hollow member and the insulating member in the radial direction of the hollow member.

[0028] Furthermore, the polarity terminal is equipped with a functional structure that increases its heat exchange area. The area where the functional structure is located is located within the heat exchange sleeve. Compared to polarity terminals without functional structures, this provides a larger heat exchange area, thereby achieving better heat exchange results.

[0029] Furthermore, the functional structure comprises n annular grooves, where n is an integer greater than or equal to 1; each annular groove extends circumferentially along the sidewall of the polarity terminal, and the n annular grooves are arranged along the height direction of the polarity terminal. Compared to other functional structures, the annular grooves are easier to manufacture, resulting in a lower cost for the polarity terminal.

[0030] Furthermore, the functional structure can also be a through-hole provided on the polarity terminal, the through-hole penetrating the polarity terminal along the x-direction. A plurality of dividing ribs can also be provided on the inner wall of the through-hole; the plurality of dividing ribs are evenly distributed along the circumference of the through-hole, and each dividing rib extends axially along the through-hole. By providing dividing ribs within the through-hole, the contact area between the heat exchange medium and the polarity terminal can be further increased, thereby increasing the heat exchange area and further improving the heat exchange effect. In addition, the plurality of dividing ribs are evenly distributed along the circumference of the through-hole, so that the temperature uniformity of each part of the polarity terminal is better. Each dividing rib extends axially along the through-hole, without affecting the fluidity of the heat transfer medium within the through-hole.

[0031] Furthermore, a second insulating sealant layer is provided on the top plate of the housing, and each heat exchange sleeve is located within this second insulating sealant layer. This second insulating sealant layer not only prevents short circuits caused by condensation on the outside of the heat exchange sleeve, but also further improves the sealing and stability of the entire heat exchange sleeve.

[0032] The beneficial effects of the utility model are:

[0033] The heat exchange device of the utility model includes multiple heat exchange sleeves, one of which is positioned around each polarity terminal. The annular cavity formed between the inner wall of each heat exchange sleeve and the side wall of the polarity terminal serves as a flow chamber for the heat exchange medium. The polarity terminal extends out of the heat exchange sleeve in the z-direction, meaning that part of the polarity terminal's structure is located within the heat exchange sleeve, in direct contact with the insulating heat exchange medium. Another part of the polarity terminal's structure is located outside the heat exchange sleeve, serving as an electrical connection. The heat exchange sleeves on the same side of each single battery are connected, forming two heat exchange channels on top of the high-capacity battery. These two heat exchange channels can be connected in parallel or in series, enabling heat exchange within the high-capacity battery.

[0034] Compared with the solution of Chinese patent CN118299714A, firstly, the heat exchange path is shortened from "heat exchange medium-heat exchange element-polarity terminal" to "heat exchange medium-polarity terminal". The heat exchange medium directly acts on the polarity terminal, which can improve the utilization efficiency of the heat exchange medium and thus improve the heat exchange efficiency of such large-capacity batteries; secondly, the heat exchange area is increased from "a slot with a certain surface area" to "a partial structure where the polarity terminal is located in the heat exchange device", which can further improve the heat exchange efficiency of such large-capacity batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of a large-capacity battery in the background technology;

[0036] Figure 2 It is a structural schematic diagram of another large-capacity battery in the background technology;

[0037] Figure 3 This is a schematic structural diagram of a large-capacity battery assembly in Example 1;

[0038] Figure 4 is a cross-sectional view of a large-capacity battery assembly in Example 1;

[0039] Figure 5 A partial cross-sectional view of a large-capacity battery assembly in Example 1;

[0040] Figure 6 A partial cross-sectional view of another large-capacity battery assembly in Example 1;

[0041] Figure 7 Schematic diagram of the structure of the heat exchange sleeve in Example 1;

[0042] Figure 8 Schematic diagram of the structure of the heat exchange sleeve in Example 2;

[0043] Figure 9 is a cross-sectional view of the heat exchange sleeve in Example 2;

[0044] Figure 10 Schematic diagram of the installation process of the large-capacity battery assembly in Example 2 Figure 1 ;

[0045] Figure 11 Schematic diagram of the installation process of the large-capacity battery assembly in Example 2 Figure 2 ;

[0046] Figure 12 is a cross-sectional view of the upper cover assembly of the single cell in Example 5;

[0047] Figure 13 This is a schematic structural diagram of a large-capacity battery assembly in Example 6;

[0048] Figure 14 Schematic diagram of a partial explosion of a large-capacity battery assembly in Example 6;

[0049] Figure 15 is a cross-sectional view of a large-capacity battery assembly in Example 6;

[0050] Figure 16 A partial cross-sectional view of a large-capacity battery assembly in Example 6;

[0051] Figure 17 Schematic diagram of the partial structure of the large-capacity battery assembly in Example 6;

[0052] Figure 18 This is a schematic diagram of the explosion of the housing in Example 6;

[0053] Figure 19 This is a schematic diagram of the structure of the cylinder in Example 6.

[0054] The accompanying drawings are denoted as follows:

[0055] 01. Heat exchange component; 1. Heat exchange sleeve; 11. Hollow component; 111. Limiting rib; 12. Annular sealing plate; 13. Through hole; 14. Liquid inlet pipe; 15. Liquid outlet pipe; 2. Single battery; 21. Polarity terminal; 211. Electrical connection; 22. Upper cover; 23. Insulating component; 231. Step structure; 24. Annular groove; 25. Through hole; 26. Partitioning rib plate; 27. Lower cover; 28. Unpacking component ; 29. ​​Connecting pipe section; 3. Shell; 31. Shell top plate; 311. Avoidance hole; 32. Shell bottom plate; 33. Electrolyte shared chamber; 34. Gas shared chamber; 35. Support member; 36. Cylinder; 361. Cylinder side plate; 362. Cylinder top plate; 37. End plate; 38. Sealing connector; 39. First insulating sealant layer; 40. Sealing ring; 41. Second insulating sealant layer; 42. Reinforcement rib. DETAILED DESCRIPTION

[0056] To make the above-mentioned purposes, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0057] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0058] In the description of this utility model, it should be noted that the terms "top," "bottom," and so on, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first, second, third, fourth, etc." are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] The utility model discloses a large-capacity battery assembly, comprising a large-capacity battery and a heat exchange device;

[0060] The large-capacity battery includes a shell and a plurality of single cells; the multiple single cells are arranged in the same direction and placed in the inner cavity of the shell.

[0061] A rectangular housing is usually used. For ease of description, the length direction of the housing is defined as the x direction, the width direction of the housing is defined as the y direction, and the height direction of the housing is defined as the z direction.

[0062] The present invention does not specifically limit the shell structure, and at least the following two structures can be adopted:

[0063] The first structure includes a cylinder with open ends at both ends (i.e., the end parallel to the yz plane is the open end) and end plates fixed to the two open ends of the cylinder (i.e., the end plates are parallel to the yz plane);

[0064] The second structure includes a cylinder with open ends at the top and bottom (i.e., the ends parallel to the xy plane are open ends), and a first cover plate and a second cover plate fixed to the open ends of the top and bottom of the cylinder, respectively (i.e., the first cover plate and the second cover plate are parallel to the xy plane, and the second cover plate can be an integral structure with the cylinder);

[0065] At least one shared chamber is provided in the housing.

[0066] It should be noted that:

[0067] The shared chamber can be a shared electrolyte chamber, the inner cavity of which communicates with the inner cavity of each individual cell. This shared electrolyte chamber provides each individual cell with a unified electrolyte environment, ensuring electrolyte uniformity within each cell and improving the performance and charge-discharge cycle life of large-capacity batteries. The shared electrolyte chamber described herein is a liquid channel extending along the length of the housing, located between the housing bottom plate and each individual cell. This liquid channel can be integrally formed with the housing bottom plate, or formed by providing a support member between the lower cover plate of the individual cell and the housing bottom plate.

[0068] The above-mentioned shared chamber can also be a gas shared chamber provided on the top plate of the housing, which covers the gas ports on the top of each single cell in the large-capacity battery. It should be noted that the gas port here includes the following two meanings:

[0069] 1) The gas port is a through hole directly opened on the upper cover of the single cell and passing through the inner cavity of the single cell;

[0070] At this time, the inner cavity of the gas sharing chamber is connected with the gas area of ​​the inner cavity of each single cell through the gas port. Based on the gas sharing chamber, the gas area of ​​each single cell can be connected to achieve gas balance, so that the gas of each single cell is shared to ensure the consistency of each single cell, which improves the cycle life of the large-capacity battery to a certain extent; when any single cell has thermal runaway, the smoke in the inner cavity of the single cell enters the gas sharing chamber and is discharged through the gas sharing chamber, thereby improving the safety of the large-capacity battery.

[0071] 2) The gas port is an explosion vent or explosion-proof port provided on the upper cover of the single cell, and an explosion vent membrane is provided at the explosion vent or explosion-proof port;

[0072] At this time, the gas sharing chamber is used as an explosion-proof channel. When the explosion-proof membrane at the gas port of any single battery is broken by the internal smoke, the internal cavity of the single battery and the gas sharing chamber are connected, and the internal smoke is discharged through the gas sharing chamber, thereby improving the safety of the large-capacity battery.

[0073] The above-mentioned shared chamber can also be a gas-liquid shared chamber. Through a gas-liquid shared chamber, each single battery can be placed in a unified electrolyte environment and gas environment, thereby improving the performance and charge-discharge cycle life of large-capacity batteries.

[0074] In order to facilitate the electrical connection of such large-capacity batteries, avoidance holes are provided on the top plate of the outer shell (in the outer shell of the first structure, the top plate of the outer shell is the cylindrical top plate; in the outer shell of the second structure, the top plate of the outer shell is the first cover plate) corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the corresponding avoidance holes to serve as the polarity terminals of the large-capacity battery, and the area of ​​the outer shell top plate corresponding to the avoidance holes is fixedly sealed with the outer shell of the single cell, so that the avoidance hole area of ​​the outer shell top plate is sealed.

[0075] It should be noted that the single cell polarity terminal described here can be a single cell pole. If, in order to avoid the single cell pole being unable to smoothly extend out of the avoidance hole as a polarity terminal or the height of the extended avoidance hole does not meet the set requirements, 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.

[0076] The heat exchange device is used to exchange heat for large-capacity batteries. Heat exchange here can be understood as either dissipating heat from the large-capacity battery or heating it. When the temperature of the large-capacity battery exceeds a set threshold, a lower-temperature heat exchange medium is introduced into the heat exchange device to cool the large-capacity battery. When the temperature of the large-capacity battery falls below the set threshold, a higher-temperature heat exchange medium is introduced into the heat exchange device to heat the large-capacity battery. By controlling the temperature of the heat exchange medium, the large-capacity battery can always operate at its normal operating temperature.

[0077] In order to improve the heat exchange efficiency of the above-mentioned large-capacity batteries, the present invention adopts an inventive concept similar to that of Chinese patent CN118299714A, that is, heat is mainly exchanged at the polar terminals of the single battery cells where heat is more concentrated. However, unlike Chinese patent CN118299714A, the present invention considers optimizing the heat exchange structure and adopting a direct heat exchange method to make the polar terminals directly contact the heat exchange medium to achieve heat exchange at the polar terminals; compared with the effect of indirect heat exchange of the polar terminals by the heat exchange medium through the heat exchange element, firstly, it has a shorter heat exchange path, which can improve the utilization efficiency of the heat exchange medium; secondly, it has a larger heat exchange area, which improves the heat exchange efficiency, and thus can further improve the heat exchange efficiency of such large-capacity batteries.

[0078] Based on this inventive concept, the heat exchange device of the utility model includes multiple heat exchange sleeves, one of which is positioned around each polarity terminal. The annular cavity formed between the inner wall of each heat exchange sleeve and the side wall of the polarity terminal serves as a flow chamber for the heat exchange medium. The polarity terminal extends out of the heat exchange sleeve in the z-direction, meaning that part of the polarity terminal's structure is located within the heat exchange sleeve, in direct contact with the insulating heat exchange medium. Another part of the polarity terminal's structure is located outside the heat exchange sleeve, serving as an electrical connection. The heat exchange sleeves on the same side of each single battery are connected, forming two heat exchange channels at the top of the high-capacity battery. These two heat exchange channels can be connected in parallel or in series, enabling heat exchange within the high-capacity battery.

[0079] It should be noted that:

[0080] 1. Because the polarity terminals of this utility model are in direct contact with the heat exchange medium, the ideal heat exchange medium should have good insulation, high specific heat capacity and thermal conductivity, good flame retardancy, low cost, suitable operating temperature, long life, and non-corrosive properties. In this utility model, the insulating heat exchange medium is a common insulating heat exchange medium in the prior art, which can be, but is not limited to, insulating oil and fluorinated liquid;

[0081] 2. When the heat exchange sleeve is in contact with the polarity terminals and the upper cover of the single cell or the top plate of the shell of a large-capacity battery at the same time, if the heat exchange sleeve is conductive, the positive and negative polarity terminals of the same single cell will be directly connected through the heat exchange sleeve, causing a short circuit. Therefore, the heat exchange sleeve is preferably made of insulating material. If non-insulating material is used, an insulating sealing ring can be added between the polarity terminals and the heat exchange sleeve to overcome this problem. The heat exchange sleeve can also be insulated, such as spraying insulating paint or wrapping with insulating film. For the sake of safety, the above methods can be combined to adopt multiple insulation methods to overcome this problem.

[0082] 3. When using liquid heat exchange medium, it is necessary to ensure the sealing of the heat exchange sleeve, especially at the part where the polarity terminal passes through the heat exchange sleeve.

[0083] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0084] Example 1

[0085] like Figure 3 and Figure 4 As shown in the figure, the structural diagram and cross-sectional view of the large-capacity battery assembly of this embodiment are shown respectively. As can be seen from the figure, the large-capacity battery assembly of this embodiment includes a large-capacity battery and a heat exchange device;

[0086] The high-capacity battery includes a housing 3 and a plurality of cells 2 arranged within the housing 3 along the x-direction. In this embodiment, the cells 2 are prismatic, numbering twelve. Each cell 2 has an internal cavity comprising an electrolyte region and a gas region. In other embodiments, the number of cells 2 can be adjusted based on actual needs.

[0087] The single cell 2 includes an outer shell and an electrode assembly and electrolyte located therein; the outer shell is enclosed by an outer cylinder, a lower cover assembly, and an upper cover assembly. In this embodiment, the lower cover assembly includes a lower cover plate 27. An opening member 28 may also be provided on the lower cover plate 27. This opening member 28 can be detached from the lower cover plate 27 of the single cell 2 under the action of an external force or electrolyte, forming a through hole in the lower cover plate 27 that penetrates the inner cavity of the outer shell. This through hole connects the inner cavity of each single cell 2 to the shared electrolyte chamber 33. The opening member 28 can be an existing structure, such as the opening member 28 disclosed in Chinese Patent CN221327991 U, the sealing device disclosed in Chinese Patent CN117476997A, and the opening device disclosed in CN117477117A. The upper cover assembly includes an upper cover plate 22 and two polarity terminals 21 located on the upper cover plate 22. The two polarity terminals 21 are sleeved with insulating members 23 and insulated from the upper cover plate 22 by the insulating members 23. In this embodiment, an opening piece may also be provided on the upper cover plate 22, located between the two polarity terminals 21. Under the influence of external force or electrolyte, the opening piece can be separated from the upper cover plate 22 of the single cell 2, forming a through hole in the upper cover plate 22 that penetrates the inner cavity of the outer shell. This through hole connects the inner cavity of each single cell 2 to the gas sharing chamber 34. The opening piece adopts an existing structure and can be the same or different from the opening piece 28 on the lower cover plate 27.

[0088] like Figure 4 As shown, the top plate 31 of the high-capacity battery housing in this embodiment defines a clearance hole 311 that allows the polarity terminals 21 of each battery cell 2 to extend. In this embodiment, the polarity terminals 21 of each battery cell 2 are poles, which are taller than poles of conventional battery cells 2. Each polarity terminal 21 of each battery cell 2 extends through a corresponding clearance hole 311, and the area of ​​the housing top plate 31 corresponding to the clearance hole 311 is securely sealed to the outer shell of the battery cell 2.

[0089] Sealing can usually be achieved using the following solutions:

[0090] Option 1: If Figure 4 and Figure 5 As shown, the polarity terminal 21 of each single battery 2 extends out of the corresponding avoidance hole 311, and a sealing connector 38 is added between the avoidance hole 311 and the polarity terminal 21 to achieve fixed sealing between the area of ​​the shell top plate 31 corresponding to the avoidance hole 311 and the shell of the single battery 2.

[0091] The sealing connector 38 includes a hollow tube; the bottom of the hollow tube is used to seal with the first area of ​​the single cell 2, and the top of the hollow tube is sealed with the second area of ​​the housing top plate 31; wherein the first area is the area surrounding any polarity terminal 21 on the upper cover plate 22 of the single cell 2 of any single cell 2; wherein the area surrounding the polarity terminal 21 is the area surrounding the insulating member 23 on the polarity terminal 21. The second area is the area of ​​the housing top plate 31 corresponding to any avoidance hole 311 on the housing top plate 31. The area of ​​the housing top plate 31 corresponding to the avoidance hole 311 is the area surrounding the outer surface of the housing top plate 31 corresponding to any avoidance hole 311; or the area of ​​the housing top plate 31 corresponding to the avoidance hole 311 is the wall of the avoidance hole 311.

[0092] Option 2: If Figure 6 As shown, glue is injected into the annular gap between the avoidance hole 311 and the polarity terminal 21 to form a first insulating sealant layer 39, thereby achieving a fixed seal between the housing top plate 31 area corresponding to the avoidance hole 311 and the housing of the single battery 2. Figure 6 In order to facilitate showing the avoidance hole 311 , the first insulating sealant layer 39 is not shown in the avoidance hole 311 on one side.

[0093] When the inner surface of the outer shell top plate 31 and the upper cover plate 22 of the single cell 2 are in close contact, the first insulating sealant forming the first insulating sealant layer 39 may not penetrate into the inner cavity of the outer shell 3. However, when there is a large gap between the inner surface of the outer shell top plate 31 and the upper cover plate 22 of the single cell 2, during the process of injecting the first insulating sealant into the annular gap, under the action of gravity, the first insulating sealant will inevitably flow into the inner cavity of the outer shell 3 from the annular gap and the gap between the inner surface of the outer shell top plate 31 and the upper cover plate 22 of the single cell 2. When the first insulating sealant contains substances that can react with the electrolyte, it may affect the battery performance.

[0094] To overcome this problem, Figure 6As shown, in this embodiment, a sealing ring 40 is sleeved around the polarity terminal 21 of each single cell 2. The bottom surface of the sealing ring 40 is in close contact with the upper cover plate 22 of the single cell 2, and the top surface of the sealing ring 40 is in close contact with the inner surface of the top plate 31 of the outer shell. In addition to serving as a glue barrier, the sealing ring 40 also has a sealing function, and cooperates with the first insulating sealant layer 39 to achieve a better sealing effect. In order to further improve the sealing performance, the inner ring surface of the sealing ring 40 is in close contact with the insulating component 23. An L-shaped sealing ring can also be used, and the transverse sealing surface of the L-shaped sealing ring is pressed between the upper cover plate 22 of the single cell 2 and the top plate 31 of the outer shell, and the vertical sealing surface of the L-shaped sealing ring is in close contact with the insulating component 23. The outer ring surface of the vertical sealing surface of the L-shaped sealing ring can also be in close contact with the wall of the avoidance hole 311. The vertical sealing surface can seal from the axial direction of the avoidance hole 311. In addition, the vertical sealing surface fits against the wall of the avoidance hole 311, so the L-shaped sealing ring can be positioned to avoid the sealing ring from falling off or shifting during installation.

[0095] The sealing ring 40 can be made of plastic, has a certain degree of elasticity, and does not react with the electrolyte. The sealing ring 40 does not need to be connected to the corresponding single cell 2 upper cover plate 22. It can simply be placed in the corresponding position and pressed against the corresponding single cell 2 upper cover plate 22 using the housing top plate 31. To prevent the sealing ring 40 from falling off or shifting during installation, the bottom surface of the sealing ring 40 can be bonded to the corresponding single cell 2 upper cover plate 22. Alternatively, a groove for securing the sealing ring 40 can be pre-defined on the single cell 2 upper cover plate 22 and the sealing ring 40 can be fixed in this groove.

[0096] like Figure 4 As shown, in this embodiment, a support member 35 extending along the x-direction is provided between the housing bottom plate 32 and each cell 2 to form a second channel, serving as a shared electrolyte chamber 33. A boss extending along the x-direction is provided on the housing top plate 31. A first channel is defined within the boss, which connects to the interior of the housing 3 and serves as a shared gas chamber 34, communicating with the gas areas within the interiors of each cell 2. When gas is generated within the interior of a cell 2, the interior of the first channel can also serve as a gas containment chamber, alleviating the problem of bulging of the housing 3 caused by gas generation. In other embodiments, the boss structure may not be provided, and each cell 2 may achieve gas communication through its own through-holes extending through its interior, achieving gas balance.

[0097] In some other embodiments, only the electrolyte sharing chamber 33 or the gas sharing chamber 34 may be provided.

[0098] Combine Figure 3 It can be seen that the heat exchange device of this embodiment includes 24 heat exchange sleeves 1 , and the 24 heat exchange sleeves 1 are respectively arranged on the periphery of the 24 polarity terminals 21 .

[0099] The structure of the heat exchange sleeve 1 is as follows Figure 7 As shown, it includes a hollow component 11 and an annular sealing plate 12; two through holes 13 are opened on the side wall of the hollow component 11, which penetrate its inner cavity and serve as a liquid inlet and a liquid outlet respectively; the annular sealing plate 12 is coaxial with the hollow component 11 and is sealed and fixed on the top of the hollow component 11.

[0100] Combine Figures 4 to 6 It can be seen that the heat exchange sleeve 1 is sleeved on the periphery of the polarity terminal 21, and an annular cavity is formed between the heat exchange sleeve 1 and the side wall of the polarity terminal 21, which serves as a flow chamber for the heat exchange medium; the inner side wall of the bottom end of the hollow component 11 and the outer side wall of the insulating component 23 sleeved on the polarity terminal 21 of the single battery 2 are sealed and fixed; the inner ring surface of the annular sealing plate 12 is sealed and fixed to the side wall of the polarity terminal 21, and at the same time, part of the structure of the polarity terminal 21 extends out of the inner hole of the annular sealing plate 12, serving as the electrical connection part 211 of the polarity terminal 21.

[0101] The present invention does not specifically limit the cross-sectional shape of the hollow member 11. Generally, the cross-sectional shape of the hollow member 11 is adapted to the cross-sectional shape of the polarity terminal 21. For example, when the cross-sectional shape of the polarity terminal 21 is circular, the corresponding cross-sectional shape of the hollow member 11 is circular; when the cross-sectional shape of the polarity terminal 21 is square, the corresponding cross-sectional shape of the hollow member 11 is square.

[0102] In this embodiment, the hollow member 11 and the annular sealing plate 12 are an integral part. In other embodiments, the hollow member 11 and the annular sealing plate 12 may be separate parts, but the processing is more complicated than in this embodiment.

[0103] In this embodiment, the heat exchange sleeve 1 is made of rubber. The inner sidewall of the bottom end of the hollow member 11 and the insulating member 23 are bonded together with an insulating sealant to achieve a seal between them. Furthermore, the rubber heat exchange sleeve 1 exhibits a certain degree of elastic deformation, and a tight fit between the inner surface of the annular sealing plate 12 and the sidewall of the polarity terminal 21 provides a seal. In other embodiments, an annular sealing ring may be added between the inner surface of the annular sealing plate 12 and the sidewall of the polarity terminal 21 to further enhance the seal between them.

[0104] In some other embodiments, when the heat exchange sleeve 1 is made of metal, the inner side wall of the bottom end of the hollow component 11 and the insulating component 23 can also be bonded with insulating sealant to achieve sealing and fixation between the two; the inner ring surface of the annular sealing plate 12 and the side wall of the polarity terminal 21 can be sealed by welding.

[0105] In some other embodiments, when the heat exchange sleeve 1 is made of metal, the bottom end of the hollow component 11 can also be welded to the upper cover plate 22 of the single battery 2 to achieve a sealing fixation between the two, so as to ensure the sealing between the hollow component and the side wall of the polarity terminal; the inner ring surface of the annular sealing plate 12 and the side wall of the polarity terminal 21 are sealed by insulating sealant.

[0106] like Figure 3 As shown, in this embodiment, the heat exchange sleeves 1 of each single battery 2 on the same side are connected to form two heat exchange channels on the top of the large-capacity battery. The two heat exchange channels can be connected in parallel or in series to achieve heat exchange of the large-capacity battery based on the two heat exchange channels.

[0107] Example 2

[0108] Different from Example 1, Figure 8 and Figure 9 As shown, the heat exchange sleeve 1 of this embodiment further includes a liquid inlet pipe 14 and a liquid outlet pipe 15 ; the liquid inlet pipe 14 and the liquid outlet pipe 15 are both fixed on the side wall of the hollow component 11 and are communicated with the liquid inlet and the liquid outlet respectively.

[0109] In addition, in this embodiment, the hollow member 11, the annular sealing plate 12, the liquid inlet pipe 14 and the liquid outlet pipe 15 are an integrated piece, and are all made of insulating material, preferably an insulating material with a certain elastic deformation.

[0110] It should be noted that the liquid inlet pipe 14 of one heat exchange sleeve 1 and the liquid outlet pipe 15 of another heat exchange sleeve 1 can be plugged into each other to achieve communication between the two adjacent heat exchange sleeves 1. The connecting pipe section 29 can also be used, such as Figure 10 As shown, the liquid inlet pipe 14 of one heat exchange sleeve 1 is connected to the liquid outlet pipe 15 of another heat exchange sleeve 1 to achieve communication between the two adjacent heat exchange sleeves 1 .

[0111] In this embodiment, the following two installation methods can be adopted to fix the heat exchange device and the large-capacity battery:

[0112] Installation method 1:

[0113] like Figure 10 As shown, each heat exchange sleeve 1 is mounted on the corresponding polarity terminal one by one, and during the mounting process, adjacent heat exchange sleeves are connected, and the top open end and the bottom open end of the heat exchange sleeve are sealed with the side wall of the polarity terminal; finally, two heat exchange channels are formed on the top of the large-capacity battery;

[0114] Installation method 2:

[0115] like Figure 11As shown, first, the heat exchange sleeves 1 are connected to form two heat exchange channels. Then, each heat exchange channel is installed on the top of the large-capacity battery as a whole. During the installation process, each heat exchange sleeve 1 of each heat exchange channel is sleeved on the corresponding polarity terminal to complete the sealing between the top open end and the bottom open end of the heat exchange sleeve and the side wall of the polarity terminal; finally, two heat exchange channels are formed on the top of the large-capacity battery.

[0116] It should be noted that when using Figure 6 When the avoidance hole is sealed by the glue injection method shown, the fixed installation of the above-mentioned heat exchange device and the large-capacity battery must be completed first, and then glue is injected into the annular gap (the annular gap at this time is the annular gap between the heat exchange sleeve and the avoidance hole) to form a first insulating sealant layer 39.

[0117] Example 3

[0118] refer to Figure 6 Unlike the above-mentioned embodiment, this embodiment has a step structure 231 provided on the outer wall of the insulating member 23 along its circumference; the bottom end face of the hollow member 11 in the heat exchange sleeve 1 is sealed and fixed on the step face of the insulating member 23. In this embodiment, the step face can not only support the heat exchange sleeve 1, but also achieve a sealed fixation between the bottom end of the hollow member 11 and the insulating member 23 from the radial direction of the hollow member 11 (insulating sealant can be applied to the step face to achieve a sealed fixation between the bottom end of the hollow member 11 and the insulating member 23). In addition, the fixation of the bottom end face of the hollow member 11 to the step face of the insulating member 23 can completely prevent the heat exchange sleeve 1 from contacting the upper cover plate 22, and even if the heat exchange sleeve 1 is made of metal, short circuits can be avoided.

[0119] In this embodiment, a limiting rib 111 may be provided on the inner wall of the hollow component 11 along its axial direction; the bottom end of the limiting rib 111 is pressed against the top end surface of the insulating component 23 , which can further improve the stability of the heat exchange sleeve 1 on the polarity terminal 21 .

[0120] Example 4

[0121] refer to Figures 4 to 6 In this embodiment, two annular grooves 24 are formed on the sidewall of the polarity terminal 21. These grooves 24 are arranged along the height of the polarity terminal 21, and each groove 24 extends circumferentially along the sidewall of the polarity terminal 21. The two annular grooves 24 increase the heat exchange area of ​​this portion of the polarity terminal 21. When this portion is placed within the inner cavity of the heat exchange sleeve 1, a better heat exchange effect can be achieved compared to a polarity terminal 21 with smooth sidewalls.

[0122] In some other embodiments, the number of the annular grooves 24 and their dimensions such as groove width and groove depth can be adjusted as required, specifically on the premise that the conductive performance of the polarity terminal 21 is not affected.

[0123] In some other embodiments, other structures may be processed on the polarity terminal 21 to increase the heat exchange area of ​​the polarity terminal 21. For ease of description, in the present invention, structures that can increase the heat exchange area of ​​the polarity terminal 21 are collectively referred to as functional structures; such functional structures may include point-shaped pits, protrusions, etc. located on the side walls of the polarity terminal 21; compared with the above-mentioned functional structures, the annular groove 24 structure of this embodiment is easy to process and has a lower processing cost.

[0124] Example 5

[0125] Different from Example 4, Figure 12 As shown in FIG. 1 , a cross-sectional view of the upper cover assembly of each single cell in the large-capacity battery assembly of this embodiment is shown. In this embodiment, a through hole 25 penetrating the polarity terminal 21 is provided on the polarity terminal 21 as a functional structure to increase the heat exchange area between the polarity terminal 21 and the heat exchange medium. Figure 12 As can be seen, in this embodiment, taking one via 25 as an example, the cross-sectional area of ​​the via 25 can be increased as much as possible without affecting the conductivity of the polarity terminal 21, thereby increasing the heat exchange area and improving the heat exchange effect. In other embodiments, two or more vias 25 may be provided, specifically, without affecting the conductivity of the polarity terminal 21.

[0126] In this embodiment, the central axis of the through hole 25 is parallel to the plane of the upper cover plate 22. In other embodiments, the extension line of the central axis of the through hole 25 may have a certain angle with the upper cover plate 22, and the angle does not need to be equal to 90°.

[0127] In order to further optimize the heat exchange effect, this embodiment can also set four dividing ribs 26 in the through hole 25. The four dividing ribs 26 are evenly distributed along the circumference of the through hole 25, and each dividing rib 26 extends axially along the through hole 25; based on the four dividing ribs 26, the contact area between the heat exchange medium and the polarity terminal 21 can be increased, that is, the heat exchange area is increased, and the heat exchange effect can be effectively improved.

[0128] In some other embodiments, the number and arrangement of the dividing ribs 26 may be adjusted according to the size of the through-holes 25 , without affecting the circulation of the heat exchange medium.

[0129] Example 6

[0130] Different from the above embodiment, this embodiment is based on the above embodiment, in which a second insulating sealant layer 41 is laid on the top of the heat exchange device.

[0131] Specific structure such as Figures 13 to 16 As shown in Figure 6 Taking the large-capacity battery assembly as an example, a second insulating sealant layer 41 is added thereto. The second insulating sealant layer 41 covers the top of the large-capacity battery and wraps all the heat exchange sleeves 1 .

[0132] To improve the stability of the second insulating sealant layer 41, this embodiment can also perform a plastic spraying process on the large-capacity battery housing 3. On the one hand, this can achieve insulation of the aluminum housing 3. On the other hand, compared with the bonding strength with the aluminum housing 3, the insulating sealant is easier to bond with the plastic spray outer layer and has a higher bonding strength, thereby providing a higher stability of the second insulating sealant layer 41. In addition, by matching the types of plastic spray material and the second insulating sealant, the bonding strength between the two can be improved.

[0133] like Figure 17 As shown, reinforcing ribs 42 may be provided on each heat exchange sleeve 1 , and the second insulating sealant layer 41 and the reinforcing ribs 42 form a stopper matching structure, which can improve the stability of the second insulating sealant layer 41 .

[0134] The second insulating sealant layer 41 and the first insulating sealant layer 39 can be used as a whole, which can not only achieve the sealing of the avoidance hole 311, but also has at least the following advantages:

[0135] 1. Further improve the sealing performance of various parts of the heat exchange sleeve 1;

[0136] Specifically, when a small gap still exists between the inner hole of the annular sealing plate 12 of the heat exchange sleeve 1 and the polarity terminal 21, the insulating sealant liquid constituting the second insulating sealant layer 41 penetrates into the small gap and further seals the gap in the radial direction (the insulating sealant liquid cannot flow into the inner cavity of the heat exchange sleeve 1 through the small gap);

[0137] 2. Anti-condensation;

[0138] During long-term use, condensation will form on the surface of the heat exchange sleeve 1 due to the temperature difference between the inside and outside. When the condensation accumulates to a certain amount, it may cause a short circuit. By laying a second insulating sealant layer 41 on the top of the heat exchange sleeve 1, when condensation forms on the surface of the heat exchange sleeve 1, the second insulating sealant layer 41 protects the battery from short circuiting.

[0139] 3. Achieve insulation between the heat exchange sleeve 1 and the top of the large-capacity battery;

[0140] When a heat exchange sleeve 1 made of non-insulating material is used, the second insulating sealant layer 41 completely wraps the heat exchange sleeve 1, which can achieve insulation of such heat exchange sleeve 1 and further improve the insulation performance between the heat exchange sleeve 1 and the top of the large-capacity battery.

[0141] 4. Improve the stability of the heat exchange sleeve 1;

[0142] Since the heat exchange sleeve 1 is completely wrapped by the second insulating sealant layer 41 , the stability of the heat exchange sleeve 1 on the large-capacity battery can be further improved.

[0143] from Figure 15 and Figure 16 It can also be seen that the electrical connection portion 211 of each polarity terminal 21 protrudes from the second insulating sealant layer 41 to facilitate connection with the electrical connector assembly. The electrical connector assembly is used to connect individual cells 2 in the high-capacity battery in parallel and / or connect adjacent high-capacity batteries in series. Furthermore, the second insulating sealant layer 41 is exposed at both the liquid inlet and outlet ends of the heat exchange channel, facilitating connection to external heat exchange equipment storing heat exchange medium.

[0144] In some other embodiments, after the electrical connection assembly is connected to the polarity terminal 21, a second insulating sealant layer 41 can be laid on the top of the large-capacity battery, that is, the second insulating sealant layer 41 completely covers the polarity terminal 21 of the single battery 2 and the connection part between the electrical connection assembly and the polarity terminal 21; in the entire large-capacity battery, after the outer shell 3 is insulated, only the free end of the electrical connection assembly (used to realize the series connection of large-capacity batteries) is exposed and charged, and the rest of the parts are insulated, so that such large-capacity batteries have higher safety performance.

[0145] In order to prevent the problem of glue overflow during the glue injection process, the local structure of the shell 3 is used as a glue baffle. Figure 18 and Figure 19 , the structure of the housing 3 of this embodiment is described in detail.

[0146] like Figure 18 As shown in FIG. 3 , the exploded structure diagram of the shell 3 of this embodiment is shown. The shell 3 is disassembled into a cylinder 36 with two open ends and an end plate 37 covering the open ends of the cylinder 36. The structure of the cylinder 36 is as follows: Figure 19 As shown, both ends of the cylinder 36 are open, i.e., the open ends of the cylinder 36 are parallel to the yz plane. In the z-direction, the height of the cylinder side panels 361 is higher than the height of the cylinder top panel 362. The portion of the cylinder side panels 361 that is higher than the cylinder top panel 362 serves as a rubber baffle. The cylinder 36 can be integrally formed using an aluminum extrusion process, which is easy to process and has better sealing performance than a separate structure.

Claims

1. A large-capacity battery assembly, characterized in that: Including large-capacity batteries and heat exchange devices; The high-capacity battery includes a housing and multiple single cells; the multiple single cells are arranged in the inner cavity of the housing along the x-direction, and the housing has at least one shared chamber, the inner cavity of the shared chamber is connected to the inner cavity of all the single cells; the top plate of the housing has avoidance holes corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the area of ​​the top plate of the housing corresponding to the avoidance holes is fixedly sealed to the outer shell of the single cell; The heat exchange device includes multiple heat exchange sleeves, each of which corresponds to a polarity terminal. Each heat exchange sleeve is respectively mounted on the periphery of the corresponding polarity terminal, and an annular cavity is formed between the inner side wall of the heat exchange sleeve and the side wall of the polarity terminal. The annular cavity serves as a flow chamber for the heat exchange medium. The electrical connection portion of the polarity terminal extends out of the heat exchange sleeve. The top open end and the bottom open end of the heat exchange sleeve are sealed from the side wall of the polarity terminal. The heat exchange sleeves of adjacent single cells located on the polarity terminals on the same side are connected to each other.

2. The large-capacity battery assembly according to claim 1, characterized in that: The polarity terminals of each single cell are sleeved with an insulating member, and the polarity terminals are insulated from the upper cover of the single cell by the insulating member; The heat exchange sleeve includes a hollow member and an annular sealing plate; two through holes are provided on the side wall of the hollow member, which penetrate the inner cavity and serve as a liquid inlet and a liquid outlet respectively; the annular sealing plate is coaxial with the hollow member and is sealed and fixed to the top of the hollow member; The heat exchange sleeve is mounted on the polarity terminal, and the inner sidewall of the bottom end of the hollow member of the heat exchange sleeve is sealed and fixed to the outer sidewall of the insulating member. The inner ring surface of the annular sealing plate of the heat exchange sleeve is sealed and fixed to the sidewall of the polarity terminal. The electrical connection portion of the polarity terminal extends out of the inner hole of the annular sealing plate. An annular cavity is formed between the heat exchange sleeve and the polarity terminal, and the annular cavity serves as a flow chamber for the heat exchange medium. The liquid inlet and the liquid outlet of the heat exchange sleeve of the adjacent single cells located on the polarity terminals on the same side are connected to each other.

3. The large-capacity battery assembly according to claim 2, characterized in that: The heat exchange sleeve also includes a liquid inlet pipe and a liquid outlet pipe; the liquid inlet pipe and the liquid outlet pipe are both fixed on the side wall of the hollow component and are connected to the liquid inlet and the liquid outlet respectively; The heat exchange sleeves of adjacent single cells located on the polarity terminals on the same side are connected to each other through a liquid inlet pipe and a liquid outlet pipe.

4. The large-capacity battery assembly according to claim 3, characterized in that: The hollow component, the annular sealing plate, the liquid inlet pipe and the liquid outlet pipe are integrated into one piece and are all made of rubber.

5. The large-capacity battery assembly according to claim 4, characterized in that: A limiting rib is provided on the inner side wall of the hollow component along its axial direction, and the lower end surface of the limiting rib abuts against the upper end surface of the insulating component.

6. The large-capacity battery assembly according to claim 5, characterized in that: A step structure is provided on the outer side wall of the insulating component along its circumference; The inner side wall of the bottom end of the hollow component and the outer side wall of the insulating component are sealed and fixed, and the end surface of the bottom end of the hollow component is sealed and fixed on the step surface of the insulating component.

7. The large-capacity battery assembly according to any one of claims 1 to 6, characterized in that: The polarity terminal is provided with a functional structure, which is used to increase the heat exchange area of ​​the polarity terminal.

8. The large-capacity battery assembly according to claim 7, characterized in that: The functional structure is n annular grooves, where n is an integer greater than or equal to 1; each annular groove extends circumferentially along the side wall of the polarity terminal, and the n annular grooves are arranged along the height direction of the polarity terminal.

9. The large-capacity battery assembly according to claim 7, characterized in that: The functional structure is at least one through hole provided on the polarity terminal, and the through hole penetrates the polarity terminal along the x direction.

10. The large-capacity battery assembly according to claim 7, characterized in that: A second insulating sealant layer is provided on the top plate of the shell, and each heat exchange sleeve is located in the second insulating sealant layer.

Images