Pole assembly, cover plate assembly, battery cell and battery pack

Abstract

The utility model provides a pole assembly, a cover plate assembly, a battery cell and a battery pack, the pole assembly comprises a pole and a pole aluminum block, the pole aluminum block comprises an aluminum block body, at least one side of the aluminum block body is provided with a first protruding part, the pole aluminum block is further provided with a pole connecting hole, the pole connecting hole penetrates through the pole aluminum block in the thickness direction, and the pole aluminum block is provided with a second protruding part. The pole connecting hole is located in the outline range of the first protruding part, and one end of the pole is connected into the pole connecting hole. According to the terminal post assembly, the terminal post aluminum block is provided with the local thickening area to be connected with the terminal post, so that the structural strength of the terminal post aluminum block is improved, the risk of deformation of the terminal post aluminum block when the terminal post aluminum block is connected with the terminal post is reduced, the assembly yield of the terminal post aluminum block and the terminal post is improved, and the connection strength of the terminal post aluminum block and the terminal post is improved; and besides the local thickening area of the pole aluminum block, the thicknesses of other areas of the pole aluminum block can be reduced, so that the raw material cost of the pole aluminum block is reduced, the weight of the pole aluminum block is reduced, and the lightweight requirement is met.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole assembly, a cover assembly, a battery cell and a battery pack. Background Art

[0002] As the requirements for improving the energy density of battery cells and reducing the cost of battery cells become increasingly higher, the thickness of the pole aluminum block tends to be thinner in the current technical solutions. This can reduce the raw material cost of the pole aluminum block and reduce the weight of the parts. However, reducing the thickness of the pole aluminum block will also cause the pole aluminum block to be easily deformed during the connection with the pole, resulting in a lower yield rate, and will also reduce the connection strength between the pole aluminum block and the pole. Utility Model Content

[0003] The purpose of this application is to provide a pole assembly, a cover plate assembly, a battery cell and a battery pack, which reduce the raw material cost of the pole aluminum block, reduce the weight of the parts, and the pole aluminum block is not easily deformed when connected to the pole, thereby improving the assembly yield and the connection strength of the pole aluminum block.

[0004] To solve the above technical problems, the present application provides a pole assembly, comprising a pole and a pole aluminum block, wherein the pole aluminum block comprises an aluminum block body, at least one side of the aluminum block body having a first protrusion, and the pole aluminum block is further provided with a pole connection hole, wherein the pole connection hole passes through the pole aluminum block along the thickness direction, the pole connection hole is located within the contour range of the first protrusion, and one end of the pole is connected to the inside of the pole connection hole.

[0005] In the pole assembly of this embodiment, a first protrusion is provided on at least one side of the aluminum block body, so that the pole aluminum block forms a local thickened area, and the pole connection hole is located within the contour range of the first protrusion, that is, the pole connection hole is provided in the local thickened area. In this way, the pole aluminum block is actually connected to the pole through the local thickened area. On the one hand, it can improve the structural strength of the pole aluminum block, reduce the risk of deformation of the pole aluminum block during the connection process with the pole, improve the assembly yield of the pole aluminum block and the pole, and at the same time, it can also improve the connection strength between the pole aluminum block and the pole; on the other hand, except for the connection area between the pole aluminum block and the pole, that is, except for the local thickened area of ​​the pole aluminum block, the thickness of other areas of the pole aluminum block can be reduced, thereby reducing the raw material cost of the pole aluminum block, reducing the weight of the pole aluminum block, reducing the weight of the battery cell, and meeting the lightweight requirements.

[0006] Optionally, the first protrusion is located in the central area of ​​the aluminum block body, and the side of the aluminum block body facing the pole further has a second protrusion, and the second protrusion is close to the outer edge of the aluminum block body.

[0007] Optionally, the first protrusion and the second protrusion are located on the same side of the aluminum block body;

[0008] And / or, the first protrusion and the second protrusion have the same height.

[0009] Optionally, a force application groove is provided on the end wall of the pole riveted inside the pole connection hole.

[0010] The present application also provides a cover plate assembly, comprising the aforementioned pole assembly and a cover plate, wherein the pole assembly is connected to the cover plate.

[0011] The cover plate assembly of the present application includes the aforementioned pole assembly, and therefore has the same technical effects as the aforementioned pole assembly, which will not be described in detail here.

[0012] Optionally, the pole aluminum block in the pole assembly is located outside the cover plate, the outer surface of the aluminum block body forms an external connection surface for external electrical connection, and the inner surface of the pole forms an internal connection surface for internal electrical connection.

[0013] Optionally, the pole aluminum block in the pole assembly is located on the inner side of the cover plate, the outer surface of the pole forms an external connection surface for external electrical connection, and the inner surface of the aluminum block body forms an internal connection surface for internal electrical connection.

[0014] The present application also provides a battery cell, comprising the aforementioned cover plate assembly.

[0015] The battery cell of the present application includes the aforementioned cover plate assembly, and therefore has the same technical effects as the aforementioned cover plate assembly, which will not be described in detail here.

[0016] Optionally, in the cover plate assembly, the pole aluminum block is located on the inner side of the cover plate, and the first protrusion is provided on a side of the aluminum block body facing away from the pole;

[0017] It also includes a transfer plate, which is electrically connected to the surface of the aluminum block body facing away from the pole. The transfer plate has a first avoidance gap, and the first protrusion is located inside the first avoidance gap.

[0018] The present application also provides a battery pack, comprising the aforementioned cover assembly.

[0019] The battery pack of the present application includes the aforementioned cover assembly, and therefore has the same technical effects as the aforementioned cover assembly, which will not be repeated here.

[0020] Optionally, in the cover plate assembly, the pole aluminum block is located outside the cover plate, and the first protrusion is provided on a side of the aluminum block body facing away from the pole;

[0021] It also includes a tab, which is electrically connected to the surface of the aluminum block body facing away from the pole. The tab has a second avoidance gap, and the first protrusion is located inside the second avoidance gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of the first specific embodiment of the cover plate assembly provided in this application;

[0023] Figure 2 for Figure 1 A cross-sectional view of the cover assembly along the AA direction;

[0024] Figure 3 for Figure 2 A local magnified image of the middle C1 region;

[0025] Figure 4 for Figure 2 Cross-sectional view of the middle pole aluminum block;

[0026] Figure 5 for Figure 1 Split diagram of the cover assembly;

[0027] Figure 6 This is a structural schematic diagram of a second specific embodiment of the cover plate assembly provided in this application;

[0028] Figure 7 for Figure 6 Cross-sectional view of the cover assembly along direction BB;

[0029] Figure 8 for Figure 7 A local magnified image of the middle C2 region;

[0030] Figure 9 This is a structural diagram of a specific embodiment of the battery cell provided in this application;

[0031] Figure 10 for Figure 9 Schematic diagram of the battery cell;

[0032] in, Figures 1-10 The reference numerals in the figures are as follows:

[0033] 1-pole; 1a-notch slot;

[0034] 2-pole aluminum block; 21-aluminum block body; 22-first protrusion; 23-second protrusion; 2a-pole connection hole;

[0035] 3-cover plate; 31-outer plastic; 32-smooth aluminum sheet; 33-inner plastic;

[0036] 4- Explosion-proof valve;

[0037] 5-sealing ring;

[0038] 6- housing;

[0039] 7- roll core;

[0040] 8- adapter;

[0041] A-external connection surface; B-internal connection surface. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] In this article, Figure 2 For example, when the cover plate assembly is assembled to form a battery cell, the side of the cover plate assembly close to the inside of the battery cell is the "inside", and the side close to the outside of the battery cell is the "outside".

[0044] Please refer to Figure 1-Figure 5 , Figure 1 This is a structural schematic diagram of the first specific embodiment of the cover plate assembly provided in this application; Figure 2 for Figure 1 A cross-sectional view of the cover assembly along the AA direction; Figure 3 for Figure 2 A partial enlarged view of area A in the middle; Figure 4 for Figure 2 Cross-sectional view of the middle pole aluminum block; Figure 5 for Figure 1 A split diagram of the cover assembly.

[0045] This embodiment provides a pole assembly, including a pole 1 and a pole aluminum block 2. The pole aluminum block 2 includes an aluminum block body 21. At least one side of the aluminum block body 21 has a first protrusion 22. The pole aluminum block 2 is also provided with a pole connection hole 2a. The pole connection hole 2a passes through the pole aluminum block 2 in the thickness direction. The pole connection hole 2a is located within the outline of the first protrusion 22. One end of the pole 1 is connected to the inside of the pole connection hole 2a.

[0046] In the pole assembly of this embodiment, a first protrusion 22 is provided on at least one side of the aluminum block body 21, so that the pole aluminum block 2 forms a local thickened area, and the pole connection hole 2a is located within the contour range of the first protrusion 22, that is, the pole connection hole 2a is provided in the local thickened area, and at least one end of the pole connection hole 2a passes through the end wall of the first protrusion 22. In this way, the pole aluminum block 2 is actually connected to the pole 1 through the local thickened area. On the one hand, it can improve the structural strength of the pole aluminum block 2, reduce the risk of deformation of the pole aluminum block 2 when connected to the pole 1, improve the assembly yield of the pole aluminum block 2 and the pole 1, and at the same time, it can also improve the connection strength between the pole aluminum block 2 and the pole 1; on the other hand, except for the connection area between the pole aluminum block 2 and the pole 1, that is, except for the local thickened area of ​​the pole aluminum block 2, the thickness of other areas of the pole aluminum block 2 can be reduced, thereby reducing the raw material cost of the pole aluminum block 2, reducing the weight of the pole aluminum block 2, reducing the weight of the battery cell, and meeting the lightweight requirements.

[0047] In practice, the pole aluminum block 2 and the pole 1 can be connected by riveting, and then welding to ensure reliable electrical connection.

[0048] Among them, such as Figure 3 As shown, in this embodiment, a first protrusion 22 is provided on the side of the aluminum block body 21 facing the pole 1 , and the first protrusion 22 protrudes toward the pole 1 along the thickness direction of the aluminum block body 21 .

[0049] In some other embodiments of the present application, a first protrusion 22 is provided on a side of the aluminum block body 21 facing away from the pole 1 , and the first protrusion 22 protrudes away from the pole 1 along the thickness direction of the aluminum block body 21 .

[0050] In some other embodiments of the present application, a first protrusion 22 is provided on both sides of the aluminum block body 21, wherein the first protrusion 22 located on the side of the aluminum block body 21 facing the pole 1 protrudes along the thickness direction of the aluminum block body 21 toward the pole 1, and the first protrusion 22 located on the side of the aluminum block body 21 facing away from the pole 1 protrudes along the thickness direction of the aluminum block body 21 toward the pole 1.

[0051] In practice, when the first protrusions 22 are provided on both sides of the aluminum block body 21 , the heights of the first protrusions 22 on both sides may be consistent or inconsistent, and the cross-sectional areas of the first protrusions 22 on both sides may be consistent or inconsistent.

[0052] In practice, the surface of the pole aluminum block 2 facing away from the pole 1 is used to connect with the external bar or adapter plate. In order to ensure that the connection between the external bar or adapter plate and the pole aluminum block 2 is reliable, the external bar or adapter plate can be provided with an avoidance notch at the position of the first protrusion 22 to avoid the first protrusion 22, thereby ensuring that the external bar or adapter plate fits with the surface of the pole aluminum block 2 facing away from the pole 1, thereby ensuring the reliability of the connection between the external bar or adapter plate and the pole aluminum block 2.

[0053] Please continue to refer to Figure 3 and Figure 4 In this embodiment, the first protrusion 22 is located in the central area of ​​the aluminum block body 21 , and the side of the aluminum block body 21 facing the pole 1 also has a second protrusion 23 , and the second protrusion 23 is close to the outer edge of the aluminum block body 21 .

[0054] It is understood that the thickness of the pole aluminum block 2 is reduced in areas other than the center. If the cross-sectional dimensions of the aluminum block body 21 are large, the edge of the aluminum block body 21 will tend to warp away from the pole 1 during the riveting process. Therefore, to ensure the surface flatness of the side of the pole aluminum block 2 facing away from the pole 1, this embodiment provides a second protrusion 23 near the outer edge of the aluminum block body 21 to increase the overall cross-sectional rigidity of the pole aluminum block 2 and ensure surface flatness on the side of the pole aluminum block 2 facing away from the pole 1.

[0055] Depend on Figure 4 It can be seen that in this embodiment, the first protrusion 22 and the second protrusion 23 are located on the same side of the aluminum block body 21 .

[0056] It is understood that if the first protrusion 22 and the second protrusion 23 are located on different sides of the aluminum block body 21, the side of the aluminum block body 21 on which the first protrusion 22 is provided is defined as the first side, and the side of the aluminum block body 21 on which the second protrusion 23 is provided is defined as the second side. During the forming process of the pole aluminum block 2, the pole aluminum block 2 blank must first be fixed, with the first side of the aluminum block body 21 facing the processing tool, to form the first protrusion 22. Then, the pole aluminum block 2 blank must be loosened, flipped over, and fixed, with the second side of the aluminum block body 21 facing the processing tool, to form the second protrusion 23. Of course, it is also feasible to process the second protrusion 23 first and then the first protrusion 22. In short, if the first protrusion 22 and the second protrusion 23 are located on different sides of the aluminum block body 21, the processing process is relatively cumbersome, reducing the production efficiency of the pole aluminum block 2.

[0057] In this embodiment, the first protrusion 22 and the second protrusion 23 are located on the same side of the aluminum block body 21. During the molding process of the pole aluminum block 2, the first protrusion 22 and the second protrusion 23 can be processed without adjusting the fixed direction of the pole aluminum block 2. The processing is relatively simple, which improves the production efficiency of the pole aluminum block 2 and is a more preferred technical solution.

[0058] In addition, in practice, there is no restriction on the heights of the first protrusion 22 and the second protrusion 23. For example, the heights of the first protrusion 22 and the second protrusion 23 may be the same or different, which does not affect the realization of the above technical effects.

[0059] Depend on Figure 4 It can be seen that in this embodiment, the first protrusion 22 and the second protrusion 23 have the same height.

[0060] In this way, during the processing of the first protrusion 22 and the second protrusion 23, a stamping mechanism can be used to stamp the annular area between the first protrusion 22 and the second protrusion 23. After stamping, highly consistent first protrusions 22 and second protrusions 23 will naturally be formed, that is, the first protrusion 22 and the second protrusion 23 can be processed and formed at one time, thereby improving the production efficiency of the pole aluminum block 2.

[0061] Please continue to refer to Figure 3 In this embodiment, a notch groove 1a is provided on the end wall of the pole 1 riveted inside the pole connection hole 2a.

[0062] In this way, during the riveting process of the pole 1 and the pole aluminum block 2, the force applying end of the force applying mechanism can be partially inserted into the force applying groove 1a, so that the pole 1 is deformed in all directions after being subjected to force, thereby completing the riveting of the pole 1 and the pole aluminum block 2.

[0063] This embodiment further provides a cover plate assembly, including the aforementioned pole assembly and a cover plate 3 , wherein the pole assembly is connected to the cover plate 3 .

[0064] The cover plate assembly of this embodiment includes the aforementioned pole assembly, and therefore has the same technical effects as the aforementioned pole assembly, which will not be described in detail here.

[0065] Among them, such as Figure 3 As shown, in this embodiment, the pole aluminum block 2 in the pole assembly is located outside the cover plate 3, the outer surface of the aluminum block body 21 forms an external connection surface A for external electrical connection, and the inner surface of the pole 1 forms an internal connection surface B for internal electrical connection.

[0066] In this way, during the assembly process of the cover plate assembly, the pole aluminum block 2 is fitted with the outer surface of the cover plate 3, the pole 1 passes through the pole mounting hole of the cover plate 3 from the inside to the outside, and passes through the pole connection hole 2a of the pole aluminum block 2, and the wall surface of the pole 1 facing the cover plate 3 is in conflict with the inner surface of the cover plate 3 to achieve positioning. The pole 1 and the pole aluminum block 2 are riveted and then electrically connected to achieve a reliable connection between the pole assembly and the cover plate 3. The outer surface of the aluminum block body 21 forms an external connection surface A for external electrical connection, which is used to be electrically connected to the external bar plate, and the inner surface of the pole 1 forms an internal connection surface B for internal electrical connection, which is used to be electrically connected to the adapter plate, thereby achieving electrical connection between the battery cells.

[0067] Please refer to Figure 6-Figure 8 , Figure 6 This is a structural schematic diagram of a second specific embodiment of the cover plate assembly provided in this application; Figure 7 for Figure 6 Cross-sectional view of the cover assembly along direction BB; Figure 8 for Figure 6 A partial enlarged view of the C2 area in the middle.

[0068] In this embodiment, the pole aluminum block 2 in the pole assembly is located on the inner side of the cover plate 3. The outer surface of the pole 1 forms an external connection surface A for external electrical connection, and the inner surface of the aluminum block body 21 forms an internal connection surface B for internal electrical connection.

[0069] In this way, during the assembly process of the cover plate assembly, the pole aluminum block 2 is fitted with the inner surface of the cover plate 3, the pole 1 passes from the outside to the inside from the pole mounting hole of the cover plate 3, and passes from the inside of the pole connection hole 2a of the pole aluminum block 2, and the wall surface of the pole 1 facing the cover plate 3 is in conflict with the outer surface of the cover plate 3 to achieve positioning, and the pole 1 and the pole aluminum block 2 are riveted and then electrically connected to achieve a reliable connection between the pole assembly and the cover plate 3. The outer surface of the pole 1 forms an external connection surface A for external electrical connection, which is used to be electrically connected to the external bar, and the inner surface of the aluminum block body 21 forms an internal connection surface B for internal electrical connection, which is used to be electrically connected to the adapter plate, thereby achieving electrical connection between the battery cells.

[0070] Please continue to refer to Figure 5 In this embodiment, the cover plate 3 includes an outer plastic 31, a plain aluminum sheet 32, and an inner plastic 33 connected in sequence from the outside to the inside. The outer plastic 31, the plain aluminum sheet 32, and the inner plastic 33 are correspondingly provided with through holes to form a pole mounting hole. The interior of the outer plastic 31 is hollow, and the outer end of the outer plastic 31 is an open end. The pole aluminum block 2 is accommodated in the corresponding outer plastic 31.

[0071] At the same time, the cover assembly also includes an explosion-proof valve 4. The bare aluminum sheet 32 ​​is welded to the explosion-proof valve 4. When the pressure inside the battery cell is too high, the explosion-proof valve 4 can automatically open to release the pressure, thereby reducing the risk of explosion of the battery cell and improving the safety performance of the battery cell.

[0072] In addition, the cover plate assembly further includes a sealing ring 5 , which is press-fitted between the pole 1 and the cover plate 3 to ensure sealing performance between the pole 1 and the cover plate 3 .

[0073] This embodiment also provides a battery cell, including the aforementioned cover plate assembly.

[0074] The battery cell of this embodiment includes the aforementioned cover plate assembly, and therefore has the same technical effects as the aforementioned cover plate assembly, which will not be described in detail here.

[0075] In some embodiments of the cover plate assembly, the pole aluminum block 2 is located on the inner side of the cover plate 3, the first protrusion 22 is arranged on the side of the aluminum block body 21 facing away from the pole 1, and also includes an adapter plate 8, the adapter plate 8 is connected to the surface of the aluminum block body 21 facing away from the pole 1, the adapter plate 8 has a first avoidance gap, and the first protrusion 22 is located inside the first avoidance gap.

[0076] When the pole aluminum block 2 is located on the inner side of the cover plate 3, the surface of the aluminum block body 21 facing away from the pole 1 is used to connect the adapter plate 8 to achieve electrical connection with the pole ear, and the first protrusion 22 is arranged on the side of the aluminum block body 21 facing away from the pole 1. In order to avoid the first protrusion 22 interfering with the connection of the adapter plate 8, this embodiment provides a first avoidance notch in the adapter plate 8 to avoid the first protrusion 22, thereby ensuring that the surface of the aluminum block body 21 facing away from the pole 1 and the adapter plate 8 can be stably fitted, thereby ensuring the connection reliability of the adapter plate 8 and the aluminum block body 21.

[0077] In practice, the adapter plate 8 and the pole aluminum block 2 are electrically connected by welding.

[0078] Among them, such as Figure 10 As shown, the battery cell also includes a shell 6 and a core 7. The core 7 is the main body that provides electrical energy for the battery cell. The interior of the shell 6 is hollow, and one end of the shell 6 is an open end. The interior of the shell 6 forms a accommodating space for accommodating the core 7, providing support and protection for the core 7. The cover assembly is connected to the open end of the shell 6 and is welded and sealed with the shell 6.

[0079] Please refer to Figure 9-10 , Figure 9 This is a structural diagram of a specific embodiment of the battery cell provided in this application; Figure 10 for Figure 9 A diagram of the battery cell.

[0080] This embodiment also provides a battery pack, including the aforementioned cover plate assembly.

[0081] The battery pack of this embodiment includes the aforementioned cover plate assembly, and therefore has the same technical effects as the aforementioned cover plate assembly, which will not be described in detail here.

[0082] In some embodiments of the cover plate assembly, the pole aluminum block 2 is located on the outside of the cover plate 3, and the first protrusion 22 is arranged on the side of the aluminum block body 21 facing away from the pole 1. The battery pack also includes a tab, which is connected to the surface of the aluminum block body 21 facing away from the pole 1. The tab has a second avoidance gap, and the first protrusion 22 is located inside the second avoidance gap.

[0083] When the pole aluminum block 2 is located on the outside of the cover plate 3, the surface of the aluminum block body 21 facing away from the pole 1 is used to connect the tab to achieve electrical connection with the external circuit, and the first protrusion 22 is arranged on the side of the aluminum block body 21 facing away from the pole 1. In order to avoid the first protrusion 22 interfering with the connection of the tab, this embodiment provides a second avoidance gap in the tab to avoid the first protrusion 22, thereby ensuring that the surface of the aluminum block body 21 facing away from the pole 1 and the tab can be stably fitted, thereby ensuring the reliability of the connection between the tab and the aluminum block body 21.

[0084] In practice, the tab and the pole aluminum block 2 are electrically connected by welding.

[0085] The battery pack of this embodiment can be applied to vehicles or other electrical devices.

[0086] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A pole assembly, characterized in that: The invention comprises a pole (1) and a pole aluminum block (2), wherein the pole aluminum block (2) comprises an aluminum block body (21), at least one side of the aluminum block body (21) has a first protrusion (22), and the pole aluminum block (2) is further provided with a pole connection hole (2a), wherein the pole connection hole (2a) passes through the pole aluminum block (2) in a thickness direction, the pole connection hole (2a) is located within the contour range of the first protrusion (22), and one end of the pole (1) is connected to the inside of the pole connection hole (2a).

2. The pole assembly according to claim 1, characterized in that The first protrusion (22) is located in the central area of ​​the aluminum block body (21), and the side of the aluminum block body (21) facing the pole (1) also has a second protrusion (23), and the second protrusion (23) is close to the outer edge of the aluminum block body (21).

3. The pole assembly according to claim 2, characterized in that The first protrusion (22) and the second protrusion (23) are located on the same side of the aluminum block body (21); And / or, the first protrusion (22) and the second protrusion (23) have the same height.

4. The pole assembly according to any one of claims 1 to 3, characterized in that: The end wall of the pole (1) riveted inside the pole connection hole (2a) is provided with a notch groove (1a).

5. A cover plate assembly, characterized in that: The pole assembly comprises the pole assembly according to any one of claims 1 to 4, and further comprises a cover plate (3), wherein the pole assembly is connected to the cover plate (3).

6. The cover plate assembly according to claim 5, wherein: The pole aluminum block (2) in the pole assembly is located outside the cover plate (3), the outer surface of the aluminum block body (21) forms an external connection surface (A) for external electrical connection, and the inner surface of the pole (1) forms an internal connection surface (B) for internal electrical connection.

7. The cover plate assembly according to claim 5, wherein: The pole aluminum block (2) in the pole assembly is located on the inner side of the cover plate (3), the outer surface of the pole (1) forms an external connection surface (A) for external electrical connection, and the inner surface of the aluminum block body (21) forms an internal connection surface (B) for internal electrical connection.

8. A battery cell, characterized in that: The cover plate assembly comprises the cover plate assembly according to any one of claims 5 to 7.

9. The battery cell according to claim 8, characterized in that In the cover plate assembly, the pole aluminum block (2) is located on the inner side of the cover plate (3), and the first protrusion (22) is provided on the side of the aluminum block body (21) facing away from the pole (1); It also includes an adapter plate (8), the adapter plate (8) being connected to the surface of the aluminum block body (21) facing away from the pole (1), the adapter plate (8) having a first avoidance gap, and the first protrusion (22) being located inside the first avoidance gap.

10. A battery pack, characterized in that: The cover plate assembly comprises the cover plate assembly according to any one of claims 5 to 7.

11. The battery pack according to claim 10, characterized in that: In the cover plate assembly, the pole aluminum block (2) is located outside the cover plate (3), and the first protrusion (22) is provided on a side of the aluminum block body (21) facing away from the pole (1); It also includes a tab, the tab being connected to the surface of the aluminum block body (21) facing away from the pole (1), the tab having a second avoidance gap, and the first protrusion (22) being located inside the second avoidance gap.

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