Battery cover plate and battery cell

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery cover plate and a battery cell, the battery cover plate comprises a cover plate body, the negative pole body is inserted into the pole hole, the outer end of the negative pole body is riveted with the outer side of the cover plate body, a first flange is arranged at the inner end of the negative pole body, the outer diameter of the first flange is larger than the aperture of the pole hole, the outer end of the negative pole body is made of a first conductive material, and the inner end of the negative pole body is made of a second conductive material. The inner end of the negative pole body is made of a second conductive material, the first conductive material extends to the inner side of the cover plate body, and the first conductive material at least extends to the outer end of the first flange. According to the utility model, the outer-layer metal of the negative pole body extends to the inner side of the cover plate body, and the outer-layer metal is utilized to realize the limitation between the negative pole body and the inner side of the cover plate body, so that the direct stress on the bonding surface between different metals is avoided, and the structural strength and the reliability of the negative pole body are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery technical field, concretely relates to a battery cover plate and electric core. BACKGROUND

[0002] At present, the copper-aluminum combination of riveting top cover negative pole is generally adopted by copper-aluminum friction welding to achieve the need of connecting the negative copper tab inside the electric core with the negative pole. The copper and aluminum of the riveting pole in the copper-aluminum friction welding are under the conditions of pressure and high-speed friction, the material temperature is increased and plastic deformation occurs, and the composite is completed under the action of the top forging force. The defects of this process are that the traditional riveting top cover pole copper-aluminum combination surface is directly stressed and separated, the cost is high, the copper-aluminum friction welding process consumes a lot of energy, and the production efficiency is low. SUMMARY

[0003] In view of the above-mentioned defects of the prior art, the purpose of the utility model is to provide a battery cover plate and electric core which can avoid the direct stress on the combination surface of different materials of the negative pole and improve the structural strength of the negative pole.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a battery cover plate, which comprises:

[0005] A cover plate body is provided with a pole hole;

[0006] A negative pole body is inserted into the pole hole, the outer end of the negative pole body is riveted with the outer side of the cover plate body, the inner end of the negative pole body is provided with a first flange, the outer diameter of the first flange is greater than the hole diameter of the pole hole, the outer end of the negative pole body is made of a first conductive material, the inner end of the negative pole body is made of a second conductive material, the first conductive material extends to the inner side of the cover plate body, and the first conductive material extends to at least the outer end of the first flange.

[0007] In an optional embodiment of the utility model, the area close to the edge of the pole hole on the inner side of the cover plate body is provided with a recessed groove outward, the first flange is accommodated in the recessed groove, and / or the area close to the edge of the pole hole on the cover plate body is provided with a convex portion arched outward, and the first flange is accommodated on the inner side of the convex portion.

[0008] In an optional embodiment of the utility model, the second conductive material wraps the inner side of the first conductive material, a sealing ring is arranged between the first flange and the cover plate body, and the area of the first flange in contact with the sealing ring is made of a second conductive material, so that the inner side space of the battery cover plate and the first conductive material are isolated by the second conductive material and the sealing ring.

[0009] In an optional embodiment of the utility model, still include insulating piece, at least part of insulating piece set up between the cover plate body with the negative pole column body to make the negative pole column body with the cover plate body insulate.

[0010] In an optional embodiment of the utility model, the outer end of the negative pole column body is provided with a riveting piece, the riveting piece is riveted with the negative pole column body, the outer diameter of the riveting piece is greater than the hole diameter of the pole column hole, the insulating piece extends to the outside of the cover plate body, and the riveting piece abuts against the insulating piece outside the cover plate body.

[0011] In an optional embodiment of the utility model, the interface between the first conductive material and the second conductive material includes a first area and a second area, the first area is located at the center of the negative pole column body, the second area is located around the first area, the first area and the second area are arranged at a preset distance apart along the thickness direction of the negative pole column body, and the first area is closer to the outer end of the negative pole column body than the second area.

[0012] In an optional embodiment of the utility model, the preset distance is greater than 0 and less than or equal to 1.5 mm.

[0013] In an optional embodiment of the utility model, the thickness of the second conductive material corresponding to the first area is greater than or equal to 1.2 mm.

[0014] In an optional embodiment of the utility model, the thickness of the second conductive material corresponding to the second area is greater than or equal to 0.5 mm.

[0015] In an optional embodiment of the utility model, the edge of the second conductive material protrudes from the outside edge of the second area, and the edge of the second conductive material covers the side wall of the first conductive material on the first flange.

[0016] In an optional embodiment of the utility model, the thickness of the edge of the second conductive material is greater than or equal to 1 mm.

[0017] In an optional embodiment of the utility model, the thickness of the first conductive material on the first flange is greater than or equal to 0.3 mm.

[0018] In an optional embodiment of the utility model, the first area is located in the main area of the negative pole column body, and the main area is an area of the negative pole column body except the first flange.

[0019] In an optional embodiment of the utility model, the first conductive material is aluminum.

[0020] In an optional embodiment of the utility model, the second conductive material is copper.

[0021] In an optional embodiment of the utility model, the negative pole post body is made of copper-aluminum composite board.

[0022] In an optional embodiment of the utility model, the inner side of the cover plate body is further provided with an insulating plate, and the area corresponding to the negative pole post body on the insulating plate is provided with a through hole.

[0023] In an optional embodiment of the utility model, the edge of the first flange is provided with an extension extending to the inner side of the insulating plate, the extension is arranged in a spaced manner with the insulating plate and forms a clamping cavity between the extension and the insulating plate for accommodating the tab.

[0024] To achieve the above object and other related objects, the utility model further provides an electric core, which comprises the battery cover plate, an electrode assembly and a shell, the shell is connected with the battery cover plate to form a cavity for accommodating the electrode assembly, the electrode assembly is accommodated in the cavity, and the negative tab of the electrode assembly is electrically connected with the negative pole post body.

[0025] The utility model has the technical effect that the outer metal of the negative pole post body extends to the inner side of the cover plate body, and the outer metal is used to limit the negative pole post body and the inner side of the cover plate body, so that the bonding surface between different metals is not directly stressed, and the structural strength and reliability of the negative pole post body are improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is an exploded view of the battery cover plate provided by the embodiment of the utility model;

[0027] Figure 2 is a top view of the battery cover plate provided by the embodiment of the utility model;

[0028] Figure 3 is Figure 2 A-A sectional view of;

[0029] Figure 4 is Figure 3 I partial enlarged view of;

[0030] Figure 5 is Figure 4 label view of;

[0031] Figure 6 is a perspective view of the negative pole post body provided by the embodiment of the utility model;

[0032] Figure 7 is a forming process schematic view of the negative pole post body provided by the embodiment of the utility model;

[0033] Figure 8 is a cross-sectional view of the battery cover plate provided by one alternative embodiment of the present application;

[0034] Figure 9 is a cross-sectional view of the battery cover plate provided by another alternative embodiment of the present application;

[0035] Figure 10 is a cross-sectional view of the battery cover plate provided by yet another embodiment of the present application. DETAILED DESCRIPTION

[0036] The other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the present specification. The present application can also be implemented or applied by using different specific embodiments, and the details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0037] It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the drawings, not the number, shape and size of the components in actual implementation. The shape, number and ratio of each component in actual implementation can be randomly changed, and the layout pattern of the components can be more complex.

[0038] In the description of the present application, the "inner" and "outer" are based on the cavity of the battery, that is, the side or end close to the battery cavity is the inner side or end, and the side or end away from the battery cavity is the outer side or end.

[0039] Secondary batteries, also known as rechargeable batteries or energy storage batteries, refer to batteries capable of being charged by external electric energy and releasing electric energy when needed. A secondary battery includes a shell, an electrode assembly and a cover plate, the electrode assembly is accommodated in the shell, and the cover plate is connected with the shell to enclose the electrode assembly in the shell. The cover plate is generally provided with a pole post, the inner end of the pole post is connected with the tab of the cell, and the outer end of the pole post is exposed outside the cover plate for connecting external electric connectors such as busbars. The material of the negative electrode tab of the battery is generally different from that of the busbar, so the negative electrode pole post needs to be composed of two materials in order to be welded with the tab and the busbar respectively. The negative electrode pole post is generally processed by friction welding process to connect the metals (generally copper and aluminum) of different materials into one body to meet the welding requirements of the busbar and the tab. However, the copper-aluminum combination surface of the negative electrode pole post is directly stressed and has a separation risk, high cost and low production efficiency due to the influence of the processing technology and the form of the copper-aluminum combination interface. Therefore, the outer metal of the pole post is extended to the inner side of the cover plate, and the outer metal is used to limit the space between the pole post and the inner side of the cover plate to avoid the direct stress on the combination surface between different metals and improve the reliability of the pole post.

[0040] Referring to Figures 1-10 The technical scheme of the utility model will be described in detail below in combination with specific embodiments:

[0041] Referring to Figures 1-4 The battery cover plate provided by the embodiment of the utility model includes a cover plate body 10 and a negative pole post body 20. The cover plate body 10 is provided with a pole post hole 11. The negative pole post body 20 is inserted into the pole post hole 11. The outer end of the negative pole post body 20 is riveted to the outer side of the cover plate body 10. The inner end of the negative pole post body 20 is provided with a first flange 200. The outer diameter of the first flange 200 is greater than the hole diameter of the pole post hole 11. The outer end of the negative pole post body 20 is made of a first conductive material 201. The inner end of the negative pole post body 20 is made of a second conductive material 202. The first conductive material 201 extends to the inner side of the cover plate body 10, and at least extends to the outer end of the first flange 200. The outer metal of the negative pole post body 20 is extended to the inner side of the cover plate body 10, and the outer metal is used to limit the space between the negative pole post body 20 and the inner side of the cover plate body 10 to avoid the direct stress on the combination surface between different metals and improve the structural strength and reliability of the negative pole post body 20.

[0042] It should be understood that the secondary battery generally also includes a positive pole post 60, since the utility model is improved for the negative pole post, the structure of the positive pole post 60 will not be described in detail, in some embodiments, the positive pole post 60 can be arranged on the same cover plate assembly as the negative pole post for example; in some other embodiments, the positive pole post 60 can also be arranged on different cover plate assemblies from the negative pole post, or the positive pole post 60 can be arranged on the shell of the secondary battery.

[0043] As shown in Figure 4 、 9 In an optional embodiment of the utility model, a recessed groove is arranged on the inner side of the cover plate body 10 close to the edge of the pole hole 11, and the first flange 200 is accommodated in the recessed groove. In this embodiment, the first flange 200 can share the thickness space with the cover plate body 10, thereby reducing the protruding height of the first flange 200 inside the battery, and further improving the space utilization rate inside the battery and the energy density of the battery. In another embodiment, as shown in Figure 8 、 10 For example, a convex part 12 can also be arranged on the inner side of the cover plate body 10 close to the edge of the pole hole 11, and the first flange 200 is accommodated in the convex part 12, which can also make the first flange 200 share the thickness space with the cover plate body 10, thereby improving the energy density.

[0044] As shown in Figure 4 In an optional embodiment of the utility model, the second conductive material 202 wraps the inner side of the first conductive material 201, a sealing ring 40 is arranged between the first flange 200 and the cover plate body 10, and the area of the first flange 200 in contact with the sealing ring 40 is made of the second conductive material 202, so that the inner space of the battery cover plate and the first conductive material 201 are isolated by the second conductive material 202 and the sealing ring 40. In this way, the corrosion of the primary battery caused by the contact of the two different conductive materials with the electrolyte can be avoided.

[0045] As shown in Figure 4 In an optional embodiment of the utility model, an insulating part 30 is further arranged between the cover plate body 10 and the negative pole post body 20 to insulate the negative pole post body 20 from the cover plate body 10. By arranging the insulating part 30 between the cover plate body 10 and the negative pole post body 20, the short circuit between the negative pole post body 20 and the cover plate body 10 can be effectively prevented; by ensuring the electrical isolation between the negative pole post body 20 and the cover plate body 10, the safety risk caused by electrical contact is reduced.

[0046] As shown in Figure 4As shown in the optional embodiment of the utility model, the outer end of the negative pole post body 20 is provided with a riveting piece 21, the riveting piece 21 is riveted with the negative pole post body 20, the outer diameter of the riveting piece 21 is greater than the hole diameter of the pole post hole 11, the insulating piece 30 extends to the outside of the cover plate body 10, and the riveting piece 21 abuts against the insulating piece 30 outside the cover plate body 10. The riveting piece 21 can realize effective limiting of the negative pole post body 20 and the cover plate body 10 in the thickness direction, and ensures reliable connection of the negative pole post body 20 and the cover plate body 10. In some embodiments, the riveting piece 21 can be an aluminum riveting block, as shown in Figure 4 As shown in some other embodiments, the riveting piece 21 can also be a steel sheet, as shown in Figure 8 It should be understood that the separate riveting piece 21 is not necessary, for example, in some alternative embodiments, riveting between the negative pole post body 20 and the cover plate body 10 can also be realized through plastic deformation of the first conductive material 201 itself, as shown in Figure 9 .

[0047] As shown in Figure 4 In an optional embodiment of the utility model, the interface between the first conductive material 201 and the second conductive material 202 includes a first region S1 and a second region S2, the first region S1 is located at the center of the negative pole post body 20, the second region S2 is located around the first region S1, the first region S1 and the second region S2 are arranged at a preset distance apart along the thickness direction of the negative pole post body 20, and the first region S1 is closer to the outer end of the negative pole post body 20 than the second region S2. In this embodiment, the middle part of the second conductive material 202 protrudes into the first conductive material 201, which is equivalent to increasing the bonding area between the first conductive material 201 and the second conductive material 202, and improving the bonding strength between the two materials.

[0048] As shown in Figure 5 In an optional embodiment of the utility model, the preset distance H1 is greater than 0 and less than or equal to 1.5 mm. It should be understood that a too large preset distance H1 means that the second conductive material 202 has a large stretching depth, which will increase the forming difficulty of the negative pole post body 20 and affect the manufacturing yield of the negative pole post body 20. The utility model sets the preset distance H1 within 1.5 mm, which can reduce the manufacturing cost while ensuring the structural strength of the negative pole post body 20.

[0049] As shown in Figure 5As shown, in an optional embodiment of this utility model, the thickness H2 of the second conductive material 202 corresponding to the first region S1 is greater than or equal to 1.2 mm. It should be understood that if the thickness of the first region S1 is too small, the second conductive material 202 will be easily welded through when the tab and the post are welded. In this embodiment, the thickness of the first region S1 is set to be greater than 1.2 mm, which can ensure reliable connection between the tab and the negative post body 20.

[0050] Please see Figure 5 As shown, in an optional embodiment of this utility model, the thickness H3 of the second conductive material corresponding to the second region S2 is greater than or equal to 0.5 mm. It should be understood that if the thickness of the second region S2 is too small, the structural strength of the first flange 200 will not meet the riveting requirements, and the second conductive material 202 is also prone to tearing during the negative electrode post forming process. In this embodiment, the thickness H3 of the second region S2 is set to be greater than 0.5 mm, which can meet the structural strength requirements of the first flange 200 and facilitate the manufacturing and forming of the negative electrode post body 20.

[0051] Please see Figure 4 , 5 As shown, in an optional embodiment of this utility model, the edge of the second conductive material 202 protrudes beyond the outer edge of the second region S2, and the edge of the second conductive material 202 covers the sidewall of the first conductive material 201 on the first flange 200. In this embodiment, the second conductive material 202 completely covers the bottom and sidewalls of the first conductive material 201 on the first flange 200. The sealing ring 40 only needs to be placed between the second conductive material and the cover plate body 10 to achieve isolation between the first conductive material 201 and the battery cavity, simplifying the assembly process of the sealing ring 40.

[0052] Please see Figure 5 As shown, in an optional embodiment of this utility model, the thickness H4 of the edge of the second conductive material 202 is greater than or equal to 1 mm. Since the second conductive material 202 needs to cover the sidewall of the first conductive material 201 on the first flange 200, the thickness H4 of the edge of the second conductive material 202 should be greater than the sum of the thickness of the second region S2 and the thickness of the first conductive material 201 on the first flange 200. In this embodiment, the thickness H4 of the edge of the second conductive material 202 is set to be greater than 1 mm, which can ensure that the second conductive material 202 completely covers the sidewall of the first conductive material 201.

[0053] Please see Figure 5As shown, in an optional embodiment of this utility model, the thickness of the first conductive material 201 located on the first flange 200 is greater than or equal to 0.3 mm. It should be understood that the first conductive material 201 on the first flange 200 is the main structure that bears the force at the interface between the first conductive material 201 and the second conductive material 202. In this embodiment, the thickness of the first conductive material 201 in this area is set to be greater than 0.3 mm to ensure that it has sufficient strength and prevent the first flange 200 from deforming.

[0054] Please see Figure 4 , 5 As shown, in an optional embodiment of this utility model, the first region S1 is located within the main body region of the negative electrode post body 20, which is the region on the negative electrode post body 20 excluding the first flange 200. It should be understood that in order to maximize the energy density of the battery, the thickness of the negative electrode post needs to be minimized, which means that the thickness of the first flange 200 also needs to be minimized. Therefore, in this embodiment, the first region S1 is located in the region of the negative electrode post body 20 excluding the first flange 200, ensuring that the first region S1 has sufficient thickness for reliable welding between the second conductive material 202 and the electrode tab.

[0055] In an optional embodiment of this utility model, the first conductive material 201 is aluminum, and the second conductive material 202 is copper. It should be understood that the negative electrode tab of a battery is generally made of copper, and the busbar is generally made of aluminum. The inner end of the negative electrode post body 20 needs to be welded to the negative electrode tab, and the outer end of the negative electrode post body 20 needs to be welded to the busbar. Therefore, in this embodiment, the inner end of the negative electrode tab body is set to copper, and the outer end of the negative electrode tab body is set to aluminum.

[0056] Please see Figure 7 As shown, in an optional embodiment of this utility model, the negative electrode post body 20 is made of a copper-aluminum composite plate. Specifically, the copper-aluminum composite plate is formed into the negative electrode post body 20 by stamping and machining. The copper-aluminum composite extends under the aluminum sheet, and the joint surface does not directly bear the force, so it can withstand a greater riveting force. Compared with the friction welding process, the stamping and machining cycle of the copper-aluminum composite plate is shorter and more efficient. Using a copper-aluminum composite plate for the negative electrode post body 20 is less expensive than copper-aluminum friction welding.

[0057] Please see Figure 1 , 4 As shown, in an optional embodiment of this utility model, an insulating plate 50 is further provided on the inner side of the cover plate body 10, and a through hole 51 is provided on the insulating plate 50 in the area corresponding to the negative electrode post body. The insulating plate 50 can realize electrical isolation between the cover plate body 10 and the battery cavity, thereby improving the battery's sealing and safety.

[0058] Please seeFigure 10 As shown in the optional embodiment of the utility model, the edge of the first flange 200 is provided with an extension 22 extending to the inner side of the insulating plate 50, the extension 22 is arranged in a spaced manner with the insulating plate 50 and forms a clamping cavity between the extension 22 and the insulating plate 50 for accommodating the tab. The embodiment can make the tab share the thickness space with the negative pole body 20, improve the energy density of the battery, and the embodiment is suitable for the scene that the battery contains multiple battery cells.

[0059] To achieve the above object and other related objects, the utility model also provides a battery cell, which comprises the battery cover plate, an electrode assembly and a shell, the shell is connected with the battery cover plate to form a cavity for accommodating the electrode assembly, the electrode assembly is accommodated in the cavity, and the negative tab of the electrode assembly is electrically connected with the negative pole body 20. By using the above-mentioned designed battery cover plate, the bonding surface between different metals of the negative pole can be avoided from being directly stressed, and the reliability and durability of the battery cell are improved.

[0060] In summary, the utility model extends the outer metal of the negative pole body 20 to the inner side of the cover plate body 10, and uses the outer metal to limit the negative pole body 20 and the inner side of the cover plate body 10, so that the bonding surface between different metals is not directly stressed, the structural strength and reliability of the negative pole body 20 are improved; the inner side space of the battery cover plate and the first conductive material 201 are isolated by the second conductive material 202 and the sealing ring 40, so that when the two different conductive materials are in contact with the electrolyte at the same time, the primary cell corrosion is avoided.

[0061] The above-mentioned embodiments only exemplarily illustrate the principle and effect of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

[0062] In the description herein, many specific details are provided, such as examples of components and / or methods, to provide a thorough understanding of embodiments of the utility model. One skilled in the relevant art will recognize, however, that the utility model embodiments can be practiced without one or more of the specific details, or with other devices, systems, assemblies, methods, components, materials, parts, and / or the like. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail in order to avoid obscuring aspects of embodiments of the utility model.

Claims

1. A battery cover, characterized in that, include: The cover plate body has pole hole; The negative electrode post body is inserted into the electrode post hole. The outer end of the negative electrode post body is riveted to the outer side of the cover plate body. The inner end of the negative electrode post body is provided with a first flange. The outer diameter of the first flange is larger than the diameter of the electrode post hole. The outer end of the negative electrode post body is made of a first conductive material, and the inner end of the negative electrode post body is made of a second conductive material. The first conductive material extends to the inner side of the cover plate body and extends at least to the outer end of the first flange.

2. The battery cover according to claim 1, characterized in that, The inner side of the cover plate body near the edge of the pole hole has an outwardly recessed groove, and the first flange is received in the groove. And / or the area of ​​the cover plate body near the edge of the pole hole has an outwardly arched protrusion, and the first flange is received inside the protrusion.

3. The battery cover according to claim 1, characterized in that, The second conductive material wraps around the inner side of the first conductive material, and a sealing ring is provided between the first flange and the cover body. The area on the first flange that abuts against the sealing ring is made of the second conductive material, so that the inner space of the battery cover is isolated from the first conductive material by the second conductive material and the sealing ring.

4. The battery cover according to claim 1, characterized in that, It also includes an insulating element, at least a portion of which is disposed between the cover plate body and the negative terminal body to insulate the negative terminal body from the cover plate body.

5. The battery cover according to claim 4, characterized in that, The outer end of the negative electrode post body is provided with a riveting member, which is riveted to the negative electrode post body. The outer diameter of the riveting member is larger than the diameter of the electrode post hole. The insulating member extends to the outside of the cover plate body, and the riveting member abuts against the insulating member on the outside of the cover plate body.

6. The battery cover according to claim 3, characterized in that, The interface between the first conductive material and the second conductive material includes a first region and a second region. The first region is located at the center of the negative electrode body, and the second region is located around the first region. The first region and the second region are separated by a preset distance along the thickness direction of the negative electrode body, and the first region is closer to the outer end of the negative electrode body than the second region.

7. The battery cover according to claim 6, characterized in that, The preset distance is greater than 0 and less than or equal to 1.5 mm, and / or the thickness of the second conductive material corresponding to the first region is greater than or equal to 1.2 mm, and / or the thickness of the second conductive material corresponding to the second region is greater than or equal to 0.5 mm, and / or the first region is located within the main body region of the negative electrode post body, the main body region being the region on the negative electrode post body excluding the first flange.

8. The battery cover according to claim 6, characterized in that, The edge of the second conductive material protrudes from the outer edge of the second region, and the edge of the second conductive material covers the sidewall of the first conductive material on the first flange.

9. The battery cover according to claim 8, characterized in that, The edge of the second conductive material protrudes beyond the outer edge of the second region by a distance greater than or equal to 1 mm, and / or the thickness of the edge of the second conductive material is greater than or equal to 1 mm.

10. The battery cover according to claim 1, characterized in that, The thickness of the first conductive material on the first flange is greater than or equal to 0.3 mm; the width of the first conductive material on the first flange is greater than or equal to 0.7 mm; the first conductive material is aluminum; an insulating plate is also provided on the inner side of the cover plate body, and a through hole is provided on the area of ​​the insulating plate corresponding to the negative electrode post body.

11. The battery cover according to claim 1, characterized in that, The second conductive material is copper.

12. The battery cover according to claim 1, characterized in that, The negative electrode post body is made of copper-aluminum composite plate.

13. The battery cover according to claim 10, characterized in that, The edge of the first flange is provided with an extension that extends to the inner side of the insulating plate. The extension is spaced apart from the insulating plate and forms a cavity between the insulating plate for receiving the tab.

14. A battery cell, characterized in that, The battery includes a battery cover as described in any one of claims 1-13, an electrode assembly, and a housing, the housing being connected to the battery cover to form a cavity for housing the electrode assembly, the electrode assembly being housed within the cavity, and the negative electrode tab of the electrode assembly being electrically connected to the negative electrode post body.

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