A top cover assembly, an electric cell and a power battery pack

Abstract

The application discloses a top cover assembly, an electric core and a power battery pack. The top cover assembly has a pouring body. The gap between the pole and the cover body, or at least one of the mounting surfaces is provided with the pouring body. The heat of the pole can be reliably conducted to the cover body, and then reliably conducted to the shell through the cover body. The heat generated by the mechanical parts such as the pole and the tab can be quickly dissipated by the shell. The heat dissipation efficiency of the mechanical parts such as the pole and the tab is improved. The local temperature of the electric core is reduced. The working performance of the electric core is further improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a top cover assembly, a battery cell, and a power battery pack. Background Technology

[0002] As the requirements for charging speed of power battery packs become increasingly stringent, the charging rate of battery cells is also gradually breaking new records. A higher charging rate means a larger current flow to the battery cell, resulting in a higher temperature rise. Whether the cell temperature can be dissipated effectively directly affects its performance.

[0003] Besides the heat generated by the active material reaction areas within the battery cell, the temperature of a battery cell also originates from the heat generated and conducted by internal and external mechanical components (such as terminals and tabs). Under high-rate charging conditions, the temperature rise rate of these mechanical components is often faster and higher, significantly limiting the cell's charging performance. Currently, the heat dissipation efficiency of mechanical components such as terminals and tabs is often relatively low, leading to heat accumulation at these locations and severely impacting the cell's performance.

[0004] Therefore, how to improve the heat dissipation efficiency of mechanical components such as poles and tabs is one of the important issues that technicians in this field are concerned with. Summary of the Invention

[0005] The purpose of this application is to provide a top cover assembly that allows for rapid heat dissipation from mechanical components such as terminals, thereby reducing the local temperature of the battery cell and improving its performance. Another purpose of this application is to provide a battery cell and a power battery pack that include the aforementioned top cover assembly.

[0006] This application provides a top cover assembly, installed in an opening in the cell housing, comprising:

[0007] A cover body includes a first side and a second side arranged along its thickness direction, and the cover body has a mounting surface in the circumferential direction;

[0008] An electrode post is inserted into the cover body. The electrode post includes a first electrical connection terminal and a second electrical connection terminal. The first electrical connection terminal is located on the first side of the cover body, and the second electrical connection terminal is located on the second side of the cover body.

[0009] A potting body, wherein the first electrical connection terminal is located outside the potting body, and the potting body is at least partially located in the gap between the pole and the cap body, or / and the potting body is partially located on the mounting surface.

[0010] In this embodiment, at least one of the gap between the electrode post and the cover body, or the mounting surface, is provided with a potting compound. This facilitates the reliable conduction of heat from the electrode post to the cover body, and then to the housing through the cover body. The housing then dissipates the heat generated by the electrode post, tabs, and other mechanical components, improving the heat dissipation efficiency of the electrode post, tabs, and other mechanical components, reducing the local temperature of the battery cell, and further improving the performance of the battery cell.

[0011] Furthermore, in this embodiment, the first electrical connection terminal is located outside the potting compound, which does not affect the electrical connection between the electrode and external components such as the busbar.

[0012] In one example, the potting body further includes a potting layer located on the first side of the cap body, the potting layer having a first through hole that avoids the first electrical connection end, and the potting layer also having a sealing contact surface in the circumferential direction.

[0013] In one example, the peripheral wall of the pole located on the first side also has a groove, and part of the potting layer fills the inside of the groove.

[0014] In one example, the pole includes a first plate and a second plate arranged in parallel and spaced apart. The first plate and the second plate are connected by a connector. The second plate has a bent portion on opposite sides. The bent portion is inserted into the cover body. The first electrical connection end is disposed on the first plate. The second plate is abutted against the cover body.

[0015] In one example, the cover body is further provided with a pressure relief valve, and the potting layer has a second through hole that avoids the pressure relief valve.

[0016] In one example, the cap body further includes an annular protrusion located on the first side, the annular protrusion surrounding the pressure relief valve, and the height of the potting layer is less than or equal to the height of the annular protrusion.

[0017] In one example, the cover body further includes at least one flow guide groove located on the second side of the cover body. The flow guide groove extends from the location of the pressure relief valve along a predetermined direction and penetrates the peripheral wall of the cover body.

[0018] In one example, the cover body includes a plate having a circumferentially bent edge that bends toward the second side, and the mounting surface includes the outer wall surface of the bent edge;

[0019] Alternatively and / or, the cover body also includes a support rib located on the second side.

[0020] This application embodiment also provides a battery cell, including a housing, one end of which is open, and a top cover assembly as described in any of the above claims is installed at the opening position. The mounting surface of the cover body mates with the inner wall of the housing, and the sealing contact surface of the potting body seals with the inner wall of the housing.

[0021] This application embodiment also provides a power battery pack, including a housing and at least one of the above-mentioned cells located inside the housing.

[0022] The battery cell and power battery pack in the embodiments of this application have the above-mentioned top cover assembly, and therefore also have the above-mentioned technical effects of the top cover assembly. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the battery cell structure in one embodiment of this application;

[0024] Figure 2 for Figure 1 A front view of the battery cell shown in the image;

[0025] Figure 3 for Figure 2 A cross-sectional view of the structure shown;

[0026] Figure 4 for Figure 1 An exploded view of the battery cell shown.

[0027] Figure 5 for Figure 1 The diagram shows the structure of the top cover assembly in the battery cell.

[0028] Figure 6 for Figure 5 An exploded view of the structure shown;

[0029] Figure 7 This is a structural schematic diagram of the main body of the top cover assembly;

[0030] Figure 8 for Figure 7 The bottom view of the main body of the cover shown;

[0031] Figure 9 for Figure 3 Enlarged view of point B in the middle;

[0032] Figure 10 for Figure 3 Enlarged diagram at point C

[0033] Figure 11 This is a partial schematic diagram of a battery cell in another embodiment of this application, wherein the position is... Figure 3 The same as C in the middle;

[0034] Figure 12This is a partial schematic diagram of a battery cell in another embodiment of this application, wherein the position is... Figure 3 The same applies to C.

[0035] in, Figures 1 to 12 The one-to-one correspondence between the reference numerals and component names in the attached drawings is as follows:

[0036] 100 cells;

[0037] 1. Shell;

[0038] 2. Top cover assembly; 21. Cover body; 210. Plate; 211. Pressure relief valve; 212. Annular protrusion; 213. Bending edge; 214. Insertion hole; 215. Guide groove; 216. Surface; 217. Support rib; 218. Score; 219. Mounting surface; 22. Encapsulation body; 221. First through hole; 222. Second through hole; 23. Pole post; 231. First electrical connection terminal; 232. Second electrical connection terminal; 233. Groove; 23A. First plate; 23C. Connector; 23B. Second plate.

[0039] 3 poles; 31 end face; 32 pole lugs. Detailed Implementation

[0040] In response to the technical problem of heat dissipation of mechanical components such as terminals in battery cells mentioned in the background art, this application has conducted in-depth research and found that the current heat dissipation of terminals and tabs in battery cells is mainly achieved through the following methods: increasing the terminal area, improving the terminal spacing, increasing the tab width, or increasing the solder area. These heat dissipation methods are mainly improved by increasing the current flow area of ​​mechanical components and reducing the current transmission path.

[0041] However, due to the limited space available for mechanical components within the battery cell, the reduction in heat generation from these components is limited. The high heat generation and thermal conduction of the mechanical components remain the source of high local temperatures within the battery cell.

[0042] Therefore, how to accelerate the dissipation efficiency of heat from mechanical components, reduce the local temperature of the battery cell, and further improve the performance of the battery cell is a technical problem that needs to be solved by those skilled in the art.

[0043] This application uses the example of upright mounting of each cell, i.e., the terminal of each cell being located at the top of the cell, to introduce the technical solution and its effects. Of course, it is not excluded that the technical solution provided in this application can be applied to the interior of power battery packs with side-mounted or flip-mounted cells.

[0044] This application provides a power battery pack, which includes a housing and a plurality of battery cells located inside the housing. The battery cells are stacked along a predetermined direction to form a cell group, and the number of battery cells in a cell group depends on the specific product. The housing may have one cell group, or at least two cell groups may be arranged along a direction perpendicular to the predetermined direction. Although the specific structure of the power battery pack is not shown in the figures, it does not hinder those skilled in the art from understanding the above description.

[0045] Please refer to Figures 1 to 10 , Figure 1 This is a schematic diagram of the battery cell structure in one embodiment of this application; Figure 2 for Figure 1 A front view of the battery cell shown in the image; Figure 3 for Figure 2 A cross-sectional view of the structure shown; Figure 4 for Figure 1 An exploded view of the battery cell shown. Figure 5 for Figure 1 The diagram shows the structure of the top cover assembly in the battery cell. Figure 6 for Figure 5 An exploded view of the structure shown; Figure 7 This is a structural schematic diagram of the main body of the top cover assembly; Figure 8 for Figure 7 The bottom view of the main body of the cover shown; Figure 9 for Figure 3 Enlarged view of point B in the middle; Figure 10 for Figure 3 Enlarged view of point C in the middle; Figure 11 This is a partial schematic diagram of a battery cell in another embodiment of this application, wherein the position is... Figure 3 The same as C in the middle; Figure 12 This is a partial schematic diagram of a battery cell in another embodiment of this application, wherein the position is... Figure 3 The same applies to C.

[0046] Please combine Figure 1 , Figure 2 and Figure 3 Understood, in this embodiment of the application, the battery cell 100 includes components such as a housing, electrode rolls 3, and a top cover assembly 2. The housing has an inner cavity, the electrode rolls 3 are located inside the inner cavity, and one side of the inner cavity has an opening. The top cover assembly 2 is installed at the opening and can seal the opening with the housing. The housing can be made of metal or non-metal.

[0047] In this embodiment, the electrode roll 3 typically has two tabs 32, namely a positive tab and a negative tab, and the battery cell 100 also has two terminals 23, namely a positive terminal and a negative terminal. The positive terminal is electrically connected to the positive tab. Typically, the positive tab can be made of aluminum (Al) material, and the negative tab can be made of nickel (Ni) material. The negative tab 32 can also be made of copper plated with nickel (Ni-Cu) material. Of course, the positive and negative tabs can also be made of other materials, which will not be listed one by one in this article.

[0048] The negative terminal is electrically connected to the negative tab, and the electrical connection between the terminal 23 and the tab 32 can be fixed by welding. That is, the terminal 23 has a first electrical connection end 231 and a second electrical connection end 232. The second electrical connection end 232 is located inside the housing 1 and is electrically connected to the tab 32. The first electrical connection end 231 is located outside the housing 1 and is used for electrical connection to the busbar. In this way, the terminals 23 of all the cells 100 can be connected in series or / and in parallel through the busbar according to a set rule to form a power supply.

[0049] The positive and negative terminals can be made of single-component materials, such as copper or aluminum, which have good conductivity, or composite materials with different components, such as copper or aluminum, which have good conductivity. As long as good conductivity can be achieved, it is acceptable.

[0050] In this embodiment, the top cover assembly 2, in addition to the aforementioned pole 23, also includes a cover body 21 and a potting compound 22, with the pole 23 inserted into the cover body 21. The cover body 21 can be made of a high thermal conductivity insulating material that is fire-resistant, high-temperature resistant, and corrosion-resistant, such as silicone, PP, or other high thermal conductivity insulating materials. The cover body 21 can be formed by injection molding, but other processes, such as extrusion, are also possible.

[0051] The cap body 21 includes a first side and a second side arranged along its thickness direction. The second side is the side of the cap body 21 facing the tab 32, and correspondingly, the first side is the side of the cap body 21 facing away from the second side, that is, the side of the cap body 21 facing the potting compound 22. The cap body 21 has a mounting surface 219 circumferentially, and the mounting surface 219 of the cap body 21 can be inserted into the opening of the housing 1. The mounting surface 219 can be interference-fitted with the inner wall of the inner cavity of the housing 1.

[0052] The electrode post 23 is inserted into the cover body 21. The electrode post 23 can be fixed to the cover body 21 by snap-fit ​​or interference fit. In one example, the cover body 21 is provided with a plug hole 214, the electrode post 23 is installed in the plug hole 214, and the second electrical connection end 232 passes through the plug hole 214 and is located on the second side of the cover body 21.

[0053] In this embodiment of the application, the potting body 22 is at least partially located in the gap between the pole post 23 and the cap body 21 (combined with...). Figure 10 (Understanding) The gap between the pole post 23 and the cover body 21 is filled with a potting compound 22, allowing the pole post 23 and the cover body 21 to make tight contact through the potting compound 22. Of course, part of the potting compound 22 can also be located on the mounting surface 219, combined with... Figure 11 This allows for close contact between the cover body 21 and the housing 1. In this embodiment, a portion or all of the mounting surface 219 may be provided with a potting compound 22 to minimize the gap between the mounting surface 219 and the inner wall of the housing 1.

[0054] In this embodiment, at least one of the gap between the pole post 23 and the cover body 21, or the mounting surface 219, is provided with a potting compound 22. This facilitates the reliable conduction of heat from the pole post 23 to the cover body 21, and then to the housing 1 through the cover body 21. The housing 1 then rapidly dissipates the heat generated by the pole post 23, the tab 32, and other mechanical components, improving the heat dissipation efficiency of the pole post 23, the tab 32, and other mechanical components, reducing the local temperature of the cell 100, and further improving the working performance of the cell 100.

[0055] Furthermore, in this embodiment, the first electrical connection terminal 231 is located outside the potting body 22, which does not affect the electrical connection between the pole 23 and external components such as the busbar.

[0056] Please refer to Figure 12 Of course, the potting compound 22 can also be located only between the mounting surface 219 and the housing, which reduces the amount of potting compound 22 used and helps to reduce the overall weight of the cell.

[0057] In one specific example, the potting body 22 further includes a potting layer located on the first side of the cap body 21. The potting layer has a first through hole 221 that avoids the first electrical connection terminal 231, and the potting layer also has a sealing contact surface in its circumferential direction. The potting body 22 is circumferentially sealed to the housing 1 through the sealing contact surface. To ensure the reliability of the circumferential seal between the potting body 22 and the housing 1, the mating position of the inner wall of the housing 1 can also be surface treated, such as by etching, grinding, or embossing, to improve the bonding strength with the potting body 22. In this embodiment, the potting body 22 is located on the first side of the cap body 21. The potting body 22 is typically a solid layer formed from a liquid through a curing process. The potting body 22 can be made of fire-retardant, high-temperature resistant, corrosion-resistant, and high thermal conductivity materials to provide insulation, high thermal conductivity, and sealing functions.

[0058] In this embodiment, during the assembly of the top cover assembly 2, the cover body 21 and the terminal post 23 are first assembled to form a component. Then, the cover body 21 is installed at the opening of the housing 1. The assembled cover body 21 is clamped in the opening of the housing 1 to achieve a preliminary seal. Then, a liquid potting compound 22 is injected into the first side of the cover body 21. The potting compound 22 can enter the gap between the terminal post 23 and the cover body 21, the gap between the mounting surface 219 and the inner wall of the housing 1, and form a potting layer on the first side. In this way, the contact area between the potting layer and the terminal post 23, the cover body 21, and the housing 1 is relatively large, which is conducive to the rapid transfer of heat from the terminal post 23 to the housing 1, further improving the heat dissipation efficiency at the terminal post 23, thereby improving the performance of the battery cell 100. Furthermore, this method can more easily form the potting compound 22 and further increases the seal between the cover body 21 and the housing 1, improving the overall quality of the battery cell 100.

[0059] Typically, to improve the safety of the battery cell 100, the cover body 21 is also equipped with a pressure relief valve 211, and the potting body 22 has a second through hole 222 to avoid the pressure relief valve 211. When the internal pressure of the battery cell 100 is higher than the predetermined pressure threshold, the high-temperature fluid medium inside the housing 1 will be ejected from the pressure relief valve 211. The second through hole 222 on the potting body 22 can allow the liquid ejected from the pressure relief valve 211 to pass smoothly, ensuring the safety of the battery cell 100.

[0060] The size of the second through hole 222 can be determined according to the pressure relief valve 211. The outline of the second through hole 222 is the same as the outer outline of the pressure relief valve 211, or the outline of the second through hole 222 is slightly larger than the outer outline of the pressure relief valve 211. The attached figure shows an example where the second through hole 222 is circular. Of course, the shape of the second through hole 222 is not limited to that shown in the attached figure of this application and can be any shape.

[0061] To ensure a tight seal between the cover body 21 and the inner wall of the housing 1, the cover body 21 also includes an annular protrusion 212 on the first side. The annular protrusion 212 surrounds the pressure relief valve 211, and the height of the potting layer is less than or equal to the height of the annular protrusion 212. The annular protrusion 212 can be injection molded together with the cover body 21. Thus, when liquid potting material is poured into the first side of the cover body 21, the annular protrusion 212 can prevent the liquid potting material from flowing into the pressure relief valve 211, avoiding interference with the opening of the pressure relief valve 211. Furthermore, the annular protrusion 212 can improve the strength of the cover body 21 to a certain extent.

[0062] The thickness of the annular protrusion 212 can be reasonably selected according to the structure of the cover body 21.

[0063] In this embodiment, the surface of the pressure relief valve 211 on the second side may also be provided with grooves 218. The grooves 218 can be of various shapes, such as circular, square, cross-shaped, X-shaped, etc. Figure 8 The diagram shows that the notch 218 is cross-shaped, and the notch 218 causes rupture and pressure relief when the pressure inside the housing 1 exceeds the set pressure threshold.

[0064] In this embodiment, the top cover assembly 2 further includes at least one flow guide groove 215. The flow guide groove 215 is located on the second side of the cover body 21. The flow guide groove 215 extends from the location of the pressure relief valve 211 along a preset direction to the peripheral wall of the cover body 21, and penetrates the peripheral wall of the cover body 21. In this way, the fluid medium can flow along the flow guide groove 215 to achieve directional flow of the fluid medium. As shown in the figure, both ends of the notch 218 are provided with flow guide grooves 215, and the extension direction of the flow guide groove 215 is the same as the extension direction of the corresponding notch 218.

[0065] In this embodiment, the cover body 21 includes a plate 210, with a circumferentially bent edge 213. The bent edge 213 bends towards a second side, and the mounting surface 219 includes the outer wall surface of the bent edge 213. The bending height of the bent edge 213 can be determined according to specific circumstances, for example, the height of the bent edge 213 can be 2mm, 3mm, 4mm, 5mm, or other values. The larger the size of the bent edge 213, the larger the contact area between the cover body 21 and the shell 1, resulting in better heat dissipation. In addition, the larger the size of the bent edge 213, the higher the installation stability of the cover body 21. In this embodiment, the bent edge 213 is circumferentially fitted with the inner wall of the shell 1, and the contact area between the two is relatively large, which is beneficial to improving the sealing performance between them. The injection layer is located on the surface 216 of the plate 210. This surface 216 can be a planar structure with a high flatness to improve the bonding ability between the injection layer and the plate 210. For example, the flatness can be approximately 0.2mm.

[0066] The plate 210 has insertion holes, and the electrode post 23 is inserted into the plate 210. In one specific example, the peripheral wall of the electrode post 23 on the first side also has a groove 233, and part of the potting layer fills the inside of the groove 233. In this embodiment, the contact area between the electrode post 23 and the potting layer is relatively large, which is beneficial for the heat of the electrode post 23 to be transferred to the housing 1 through the potting layer, thereby improving the heat dissipation effect.

[0067] In one example, a pole post 23 includes a first plate 23A and a second plate 23B arranged in parallel, spaced apart along the thickness direction. The first plate 23A is connected to the second plate 23B via a connector 23C, and a groove 233 is formed between the first plate 23A and the second plate 23B. The opposite sides of the second plate 23B have bent portions, which are inserted into the cover body 21. The portion of the bent portion on the second side serves as a second electrical connection. A first electrical connection end 231 is provided on the side of the first plate 23A facing away from the connector 23C. When the pole post 23 is installed, the second plate 23B is installed close to the cover body 21, resulting in high installation stability.

[0068] In this embodiment of the application, the cover body 21 also includes a support rib 217 located on the second side, which is used to press the top end face 31 of the pole roll 3, has the function of fastening the core, and can also enhance the strength of the cover body 21.

[0069] In this embodiment of the application, the general assembly process of the battery cell 100 can be as follows:

[0070] S1, core stacking or winding, hot pressing, electrode tabs 32 pre-welded;

[0071] S2. The top cover assembly 2 without a filling body is installed at the opening of the housing 1, and the electrode tab 32 is welded to the second electrical connection end 232 of the electrode post 23 in the top cover assembly 2 without a filling body;

[0072] S3. Assemble the welded core with shell 1;

[0073] S4. A liquid injection material is injected into the first side of the cover body 21 and allowed to solidify to form an injection body.

[0074] The power battery pack provided in this application embodiment can be applied to vehicles, which include a vehicle body and a housing mounted on the vehicle body. Of course, the power battery pack can also be applied to other power consumption environments.

[0075] For other structural details regarding the vehicle and battery pack, please refer to current technology; this application will not elaborate further.

[0076] In the description of embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0077] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0078] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A top cover assembly, installed in the opening of the cell housing (1), characterized in that, include: The cover body (21) includes a first side and a second side arranged along its thickness direction, and the cover body (21) has a mounting surface in the circumferential direction; A pole (23) is inserted into the cover body (21). The pole (23) includes a first electrical connection terminal (231) and a second electrical connection terminal (232). The first electrical connection terminal (231) is located on the first side of the cover body (21), and the second electrical connection terminal (232) is located on the second side of the cover body (21). The potting body (22) has the first electrical connection terminal (231) located outside the potting body (22), and the potting body (22) is at least partially located in the gap between the pole (23) and the cap body (21), or / and the potting body (22) is partially located on the mounting surface.

2. The top cover assembly according to claim 1, characterized in that, The potting body (22) further includes a potting layer located on the first side of the cap body (21), the potting layer having a first through hole (221) that avoids the first electrical connection end (231), and the potting layer also having a sealing contact surface in the circumferential direction.

3. The top cover assembly according to claim 2, characterized in that, The peripheral wall of the pole (23) on the first side also has a groove (233), and part of the potting layer fills the inside of the groove (233).

4. The top cover assembly according to claim 3, characterized in that, The pole post (23) includes a first plate (23A) and a second plate (23B) arranged in parallel and spaced apart. The first plate (23A) and the second plate (23B) are connected by a connector (23C). The second plate (23B) has a bent portion on the opposite side. The bent portion is inserted into the cover body (21). The first electrical connection end (231) is disposed on the first plate (23A). The second plate (23B) is installed close to the cover body (21).

5. The top cover assembly according to claim 2, characterized in that, The cover body (21) is also provided with a pressure relief valve (211), and the potting layer has a second through hole (222) that avoids the pressure relief valve (211).

6. The top cover assembly according to claim 5, characterized in that, The cover body (21) also includes an annular protrusion (212) located on the first side, the annular protrusion (212) being arranged around the pressure relief valve (211), and the height of the potting layer being lower than or equal to the height of the annular protrusion (212).

7. The top cover assembly according to any one of claims 1 to 6, characterized in that, The cover body (21) also includes at least one flow guide groove (215), which is located on the second side of the cover body (21). The flow guide groove (215) extends from the position of the pressure relief valve (211) along a preset direction and penetrates the peripheral wall of the cover body (21).

8. The top cover assembly according to any one of claims 1 to 6, characterized in that, The cover body (21) includes a plate (210), the plate (210) having a circumferentially bent edge (213), the bent edge (213) being bent toward the second side, and the mounting surface including the outer wall surface of the bent edge (213); Alternatively and / or, the cover body (21) also includes a support rib (217) located on the second side.

9. A battery cell, characterized in that, Includes a housing (1), one end of which is open, and a top cover assembly according to any one of claims 1 to 8 is installed at the opening position, the mounting surface of the cover body (21) is engaged with the inner wall of the housing (1), and the sealing contact surface of the potting body (22) is in sealing engagement with the inner wall of the housing (1).

10. A power battery pack, characterized in that, It includes a housing and at least one battery cell as described in claim 9 located inside the housing.

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