Battery cover and battery

Abstract

This utility model provides a battery cover and a battery. The battery cover includes a cover body, a riveting assembly, and at least one terminal post. The riveting assembly is located on one side of the cover body and includes a riveting member and at least one sealing member. The riveting member has at least one fixing groove. The fixing groove penetrates the riveting member. The sealing member is located within the fixing groove and welded to its side wall. The terminal post penetrates the cover body to extend into the fixing groove and is riveted to the inner wall of the fixing groove. The sealing member in the battery cover provides a sealed environment for the area where the terminal post connects to the riveting assembly, preventing oxidation or corrosion of the terminal post due to inadequate environmental control, thereby improving the reliability and quality of the battery cover. It also reduces the risk of defects in the battery cover during subsequent module assembly processes, thus improving the reliability and quality of the battery. The reliability and quality of the battery are thus improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology and relates to battery cover plates and batteries. Background Technology

[0002] Battery covers typically consist of components such as terminals, a plain aluminum plate, and riveting blocks. The terminals are connected to the riveting blocks via a riveting process to assemble the battery cover, a common assembly method. However, battery covers assembled using riveting are prone to defects in subsequent processes and appearance, affecting the reliability and quality of both the battery cover and the battery itself. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a battery cover and a battery to solve the problem that the reliability and quality of the battery cover and battery in the prior art need to be improved.

[0004] To achieve the above and other related objectives, in a first aspect, a battery cover is provided, comprising:

[0005] Cover plate body;

[0006] A riveting assembly is located on one side of the cover plate body in a first direction. The riveting assembly includes a riveting member and at least one sealing member. The riveting member has at least one fixing groove that penetrates the riveting member in the first direction. The sealing member is located in the fixing groove and is welded to the side wall of the fixing groove.

[0007] At least one pole extends through the cover plate body into the fixing groove, and the pole is riveted to the inner wall of the fixing groove.

[0008] In an optional embodiment, the riveting component is made of a first metal material, and the sealing component is made of a second metal material. The first metal material and the second metal material may be the same or different. The effective weld penetration depth of the sealing component to the side wall of the fixing groove is greater than or equal to 0.3 mm.

[0009] In an optional embodiment, the cross-sectional shape of the fixing groove is circular in the second direction, and the second direction is perpendicular to the first direction;

[0010] The fixing groove includes a first groove and a second groove, the second groove is located on the side of the first groove away from the cover plate body, and the diameter of the second groove is larger than the diameter of the first groove.

[0011] The inner wall of the first groove has a first stepped surface, and the pole extends into the first groove and is riveted to the first stepped surface;

[0012] The seal is located inside the second groove and is welded to the side wall of the second groove.

[0013] In an optional embodiment, before the seal is welded to the sidewall of the second groove, the distance between the seal and the sidewall of the second groove is less than or equal to 0.15 mm; and / or,

[0014] In the first direction, the thickness of the seal is t, where 0.3mm ≤ t ≤ 0.5mm.

[0015] In an optional embodiment, the fixing groove further includes a third groove portion, which is connected between the first groove portion and the second groove portion in the first direction, and the diameter of the third groove portion is larger than the diameter of the first groove portion;

[0016] The third groove exposes a portion of the rivet located around the periphery of the first groove to form a second stepped surface, and the pole post is also welded to the edge of the second stepped surface facing the first groove.

[0017] In an optional embodiment, in the first direction, the depth of the third groove is h1, where h1 ≥ 0.2 mm; and / or,

[0018] In the second direction, the width of the second step surface is w1, where w1 ≥ 0.5 mm.

[0019] In an optional embodiment, the diameter of the second groove is larger than the diameter of the third groove, and the second groove exposes a portion of the rivet located on the periphery of the third groove to form a third stepped surface, on which the seal is supported.

[0020] In an optional embodiment, the fixing groove further includes a fourth groove portion, which is located on the side of the second groove portion away from the first groove portion;

[0021] The diameter of the fourth groove is larger than the diameter of the third groove, and the fourth groove exposes a portion of the rivet located on the periphery of the third groove to form a fourth stepped surface;

[0022] The seal is welded to the edge of the fourth step facing the third groove.

[0023] In an optional embodiment, in the first direction, the depth of the fourth groove is h2, h2≥0.2mm; and / or, in the second direction, the width of the fourth step surface is w2, w2≥0.5mm.

[0024] In a second aspect, a battery is provided, the battery including a battery cover as described in the first aspect.

[0025] As described above, the battery cover of this utility model includes a cover body, a riveting assembly, and at least one terminal post. The riveting assembly is provided with a fixing groove and a sealing element. The terminal post extends into the fixing groove and connects to the side wall of the fixing groove. The sealing element is located within the fixing groove to provide a sealed environment for the area where the terminal post connects to the riveting assembly, preventing oxidation or corrosion of the terminal post due to inadequate environmental control. This improves the reliability and quality of the battery cover and reduces the risk of defects in subsequent module assembly processes, thereby enhancing the reliability and quality of the battery. The battery of this utility model, equipped with the aforementioned battery cover, exhibits improved reliability and quality. Attached Figure Description

[0026] Figure 1 This is an overall schematic diagram of the battery cover provided in an embodiment of the present utility model.

[0027] Figure 2 This is a top view of the battery cover provided in an embodiment of the present utility model.

[0028] Figure 3 for Figure 2 A cross-sectional view at point A-A'.

[0029] Figure 4 for Figure 3 A magnified view of the area at point B within the dashed box.

[0030] Figure 5 The rivet in the battery cover provided in this embodiment of the utility model is located in Figure 3 A schematic diagram of the partial structure within the dashed box.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10-Cover plate body; 20-Riveting assembly; 21-Riveting piece; 210-Fixing groove; 211-First groove; 212-Second groove; 213-Third groove; 214-Fourth groove; 215-First step surface; 216-Second step surface; 217-Third step surface; 218-Fourth step surface; 22-Sealing element; 30-Pole post; 31-Pole post body; 32-Pole post bottom; 40-Sealing ring; 50-Insulation assembly. Detailed Implementation

[0033] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0034] Please see Figures 1 to 5 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0035] Analysis of the issues mentioned in the background technology revealed that during the riveting and assembly process of battery covers, the terminals, due to the need for conductive and structural fixation, are often fixed to the riveting blocks using a riveting method. Taking copper negative terminals as an example, because of their material properties, they are prone to oxidation. Typically, the surface of the negative terminal is pre-passivated to form a protective passivation film. However, during the riveting process between the negative terminal and the riveting block, mechanical forces inevitably cause wear or damage to the passivation layer, exposing the corresponding area of ​​the negative terminal substrate to the external environment. Due to the loss of the passivation layer's protective function, if environmental conditions (such as humidity, temperature, and cleanliness) are not properly controlled during subsequent transportation and storage, the exposed negative terminal substrate is highly susceptible to reaction with oxygen and moisture in the environment, easily oxidizing and rusting. Besides causing discoloration that affects the appearance of the battery cell cover and leads to poor customer perception, this oxidation and rusting also affects subsequent battery cell manufacturing processes. Although the positive terminal is less demanding in terms of environmental requirements than the negative terminal, it is still possible for the battery cover to oxidize and corrode under extreme conditions such as high temperature and high humidity, which could lead to subsequent problems.

[0036] In view of this, this utility model provides a battery cover, which includes a riveting assembly with a fixing groove and a sealing element. The terminal post extends into the fixing groove to isolate it from the external environment based on the sealing element, thereby effectively reducing the risk of oxidation and corrosion and ensuring long-term reliability. This avoids reliability and quality problems caused by oxidation of the terminal post or poor appearance, thereby improving the reliability and quality (e.g., appearance) of the battery cover. Please refer to the following for details.

[0037] This utility model embodiment provides a battery cover. Please refer to [link / reference]. Figure 1 and Figure 2 , Figure 1 A schematic diagram of the battery cover is shown. Figure 2 A top view of the battery cover is shown. The battery cover includes a cover body 10, a riveting assembly 20, and at least one terminal post 30. Figure 1 and Figure 2 Not displayed, please refer to the relevant documents. Figure 3 It should be noted that, Figures 1 to 3The example of a battery cover with two terminals is given. In actual applications, the number of terminals in the battery cover is not limited to two. The number is set according to actual needs, and the structure of the battery cover is adjusted accordingly.

[0038] Specifically, please refer to Figure 3 , Figure 3 It shows along Figure 2 A cross-sectional view at point A-A'. The riveting assembly 20 is located on one side of the cover plate body 10 in the first direction (i.e., the Z direction), which is parallel to the thickness direction of the cover plate body 10. The riveting assembly 20 includes a riveting member 21 and at least one sealing member 22. Please refer to... Figure 4 and Figure 5 ,in, Figure 4 It shows Figure 3 A magnified view of the area at point A within the dashed box. Figure 5 A partial structural schematic diagram of the riveting component located within the dashed box A is shown. The riveting component 21 has at least one retaining groove 210, which penetrates the riveting component 21 in the first direction Z. A sealing element 22 is located within the retaining groove 210 and is welded to the sidewall of the retaining groove 210. Figure 4 As shown, the pole post 30 penetrates the cover plate body 10 to extend into the fixing groove 210 and is riveted to the inner wall of the fixing groove 210. The number of sealing elements 22 is less than or equal to the number of fixing grooves 210.

[0039] In this embodiment of the invention, by providing a fixing groove 210 and a sealing element 22 in the riveting assembly 20, and allowing the terminal post 30 to extend into the fixing groove 210, and by providing a sealed protective environment for the terminal post 30 through the sealing element 22, the surface area of ​​the terminal post 30 whose passivation layer is damaged during the riveting process is isolated from the external environment (transportation environment, storage environment, and even application environment), thereby reducing the risk of oxidation and corrosion of the terminal post 30 and ensuring the reliability of the terminal post 30 and the battery cover. Furthermore, after the battery cover is manufactured, dust accumulated due to prolonged storage cannot enter the area where the terminal post 30 and the riveting element 21 are connected. This facilitates cleaning of the battery cover and ensures the contact characteristics between the terminal post 30 and the riveting element 21, further improving reliability. It also prevents dust residue from remaining in the connection area, thus avoiding defects or malfunctions during battery module assembly.

[0040] In this embodiment of the invention, after the terminal post 30 and the riveting member 21 are riveted together, additional welding is usually performed on the contact surface between the terminal post 30 and the riveting member 21 to further improve the working performance. However, if unexpected situations occur in the welding process (e.g., excessive or insufficient helium gas), the welded area between the terminal post 30 and the riveting member 21 may exhibit discoloration problems such as blue and red discoloration. Alternatively, the terminal post 30 may turn black during subsequent battery formation processes, both of which may cause the battery's appearance to fail to meet the shipping standards. In this embodiment of the invention, the sealing member 22, in addition to providing a sealing protection effect for the terminal post 30, can also cover the aforementioned appearance defects at the terminal post 30, improving the appearance and making it meet the appearance shipping standards.

[0041] In this embodiment of the invention, the welding connection of the sealing element 22 not only achieves good sealing characteristics but also effectively ensures the long-term connection reliability between the sealing element 22 and the fixing groove 210. If conventional connection methods such as bonding are used, on the one hand, during the electrolyte injection process of the battery cell equipped with the battery cover, there is usually a situation where electrolyte overflows or splashes. Residual electrolyte will flow to the area where the sealing element 22 is located, causing the adhesive material (e.g., sealant) used for bonding to fall off or corrode, affecting the connection reliability between the sealing element 22 and the fixing groove 210, and also causing contamination of the terminal post 30, affecting its electrical performance. On the other hand, during the subsequent battery module assembly process of the battery equipped with the battery cover, the riveting element 21 needs to be welded to the busbar (or ferrule). The high temperature generated during the welding process can cause the adhesive material and even some materials of the sealing element 22 (e.g., polymer material) to melt, deform, fail, or fall off, thus losing its function of providing sealing protection for the terminal post 30.

[0042] In some embodiments, the electrode post 30 includes a negative electrode post, and the surface of the negative electrode post is plated with a passivation layer, the passivation layer having better oxidation resistance than the substrate of the negative electrode post. For example, the negative electrode post is made of copper, and the passivation layer is made of nickel. Since copper negative electrode posts are more sensitive to oxygen and moisture in the environment than aluminum positive electrode posts, this battery cover is particularly suitable for battery cover applications with negative electrode posts.

[0043] In some embodiments, the rivet 21 is made of a first metal material, and the seal 22 is made of a second metal material, which may be the same as or different from the first metal material. In a specific example, both the seal 22 and the rivet 21 are made of aluminum, in which case the first metal material and the second metal material are the same. Of course, in other embodiments, the rivet 21 and the seal 22 may also be made of other different metal materials.

[0044] In some embodiments, the effective weld penetration depth of the seal 22 and the sidewall of the fixing groove 210 is greater than or equal to 0.3 mm. For example, the effective weld penetration depth can be 0.3 mm, 0.35 mm, or 0.4 mm. Here, "effective weld penetration depth" refers to the deepest depth to which the welding heat source can melt and form a weld joint at the junction of the seal 22 (riveting member 21) and the sidewall of the fixing groove 210.

[0045] In this embodiment of the invention, the sealing element 22 and the fixing groove 210 are connected by welding, which can effectively prevent residual electrolyte in the subsequent liquid injection process and the high-temperature environment during welding from affecting the reliability of the two. When the effective welding depth of the sidewalls of the sealing element 22 and the fixing groove 210 is greater than or equal to 0.3 mm, the sealing element 22 can form a fully fused connection with the sidewalls of the fixing groove 210, ensuring the connection quality and long-term reliability between the sealing element 22 and the sidewalls of the fixing groove 210.

[0046] In some embodiments, the cross-sectional shape of the fixing groove 210 is circular in the second direction (i.e., the X direction), and the second direction X is perpendicular to the first direction Z. The fixing groove 210 includes a first groove portion 211 and a second groove portion 212. The second groove portion 212 is located on the side of the first groove portion 211 away from the cover plate body 10 (in the first direction Z), and the diameter of the second groove portion 212 is larger than the diameter of the first groove portion 211. The inner wall of the first groove portion 211 has a first stepped surface 215, and the pole post 30 extends into the first groove portion 211 and is riveted to the first stepped surface 215. The sealing member 22 is located in the second groove portion 212 and is welded to the side wall of the second groove portion 212. It is readily understood that when the cross-sectional shape of the fixing groove 210 is circular, the cross-sectional shapes of the first groove portion 211 and the second groove portion 212 (and the subsequent third groove portion 213 and fourth groove portion 214) are also circular in the same direction.

[0047] In some embodiments, before the seal 22 is welded to the sidewall of the second groove 212, the distance between the seal 22 and the sidewall of the second groove 212 is less than or equal to 0.15 mm to meet good welding requirements. If this distance is greater than 0.15 mm, spatter may occur during the welding process. If the spatter particles adhere to the joint surface, they may form micro-gaps or cracks between the two, affecting the sealing reliability and quality of the seal 22. For example, the distance between the seal 22 and the sidewall of the second groove 212 can be 0.08 mm, 0.10 mm, 0.12 mm, or 0.15 mm.

[0048] In some embodiments, such as Figure 5As shown, in the first direction Z, the thickness of the seal 22 is t, where 0.3mm ≤ t ≤ 0.5mm. For example, t can be 0.3mm, 0.35mm, or 0.5mm. If t > 0.5mm, the space provided within the riveting member 21 to accommodate the seal 22 is relatively large, which will affect the overall height design of the riveting member 21, resulting in design redundancy. If t < 0.3mm, the connection area between the seal 22 and the sidewall of the fixing groove 210 is relatively small, affecting the connection strength between the seal 22 and the fixing groove 210, and is also insufficient to guarantee the mechanical strength of the seal 22 itself.

[0049] In some embodiments, such as Figure 5 As shown, the fixing groove 210 also includes a third groove 213. In the first direction Z, the third groove 213 connects the first groove 211 and the second groove 212, and the diameter of the third groove 213 is larger than the diameter of the first groove 211. The third groove 213 exposes a portion of the riveting member 21 located on the periphery of the first groove 211 to form a second stepped surface 216. The electrode post 30 is also welded to the edge of the second stepped surface 216 facing the first groove 211. That is, the seal 22 and the electrode post 30 do not directly contact each other. The third groove 213 provides a certain assembly buffer space when the electrode post 30 and the seal 22 are assembled on the riveting member 21 to ensure the overall structural reliability of the battery cover.

[0050] Furthermore, the effective weld penetration depth between the terminal post 30 and the first groove 211 is greater than or equal to 0.3 mm. For example, the effective weld penetration depth can be 0.3 mm, 0.35 mm, or 0.4 mm. Since the terminal post 30 extends into the fixing groove 210 and its end face does not protrude beyond the riveting member 21, when the battery with the battery cover is assembled into a module, it is connected to the busbar through the riveting member 21. That is, after the battery electrode tabs in the battery casing are connected to the terminal post 30, the current is transmitted through the terminal post 30 and the riveting member 21 connected to the terminal post 30. Therefore, under the condition of satisfying the effective weld penetration depth, the welding strength between the terminal post 30 and the riveting member 21 can be guaranteed, the contact resistance between the two can be reduced, and the electrical connection performance between the two can be guaranteed, thus ensuring the working performance and reliability of the battery cover.

[0051] Furthermore, such as Figure 5As shown, in the first direction Z, the depth of the third groove 213 is h1, where h1 ≥ 0.2 mm. For example, h1 can be 0.2 mm, 0.25 mm, or 0.3 mm. If h1 < 0.2 mm, it may not meet the requirements for accommodating the welding trajectory after welding between the pole post 30 and the first groove 211, thus affecting the subsequent assembly of the seal 22. Further, in the second direction X, the width of the second step surface 216 is w1, where w1 ≥ 0.5 mm. For example, w1 can be 0.5 mm, 0.6 mm, or 0.7 mm. If w1 < 0.5 mm, the aforementioned welding trajectory will extend beyond the third groove 213 and accumulate upwards, thereby affecting the positional stability of the seal 22 placed within the second groove 212, and further affecting the welding accuracy and efficiency between the seal 22 and the sidewall of the second groove 212.

[0052] In some embodiments, the diameter of the second groove 212 is larger than the diameter of the third groove 213, and the second groove 212 exposes a portion of the rivet 21 located around the third groove 213 to form a third stepped surface 217, on which the seal 22 is supported.

[0053] Furthermore, in the first direction Z, the width of the third step surface 217 ranges from t to 2t, for example, it can be t, 1.5t, or 2t. Since the third step surface 217 needs to provide support for the seal 22, and given that the seal 22 is made of aluminum, its material properties cause it to deform under stress or heat. Therefore, the third step surface 217 needs to provide sufficient support area to reduce the risk of deformation due to insufficient support during welding, thereby ensuring welding quality and sealing performance. However, since the third step surface 217 is located inside the riveting member 21, and the dimensions of the riveting member 21 itself are limited by the specifications of the corresponding battery, the third step surface 217 cannot be too wide, thus affecting the area design of the riveting member 21 itself.

[0054] In some embodiments, such as Figure 5 As shown, the fixing groove 210 also includes a fourth groove 214, which is located on the side of the second groove 212 away from the first groove 211. The diameter of the fourth groove 214 is larger than the diameter of the third groove 213, and the fourth groove 214 exposes a portion of the rivet 21 located on the periphery of the second groove 212 to form a fourth stepped surface 218. The seal 22 is welded to the edge of the fourth stepped surface 218 facing the second groove 212. In the direction from the first groove 211 to the fourth groove 214 in the fixing groove 210, in the direction away from the cover plate body 10, the first groove 211, the third groove 213, the second groove 212, and the fourth groove 214 are sequentially connected.

[0055] In this embodiment of the invention, when the sealing element 22 is welded to the fourth step surface 218, the fourth groove 214 is configured to accommodate the welding trajectory generated after the sealing element 22 and the fourth step surface 218 are welded. Since the welding trajectory and weld slag will protrude outward from the fourth step surface 218, if the fourth groove 214 is not provided outside the second groove 212, the welding trajectory will be exposed on the side of the riveting element 21 away from the cover plate body 10. During the module assembly of the battery with the battery cover plate, the welding trajectory will affect the welding yield between the riveting assembly 20 and the busbar.

[0056] Furthermore, such as Figure 5 As shown, in the first direction Z, the depth of the fourth groove 214 is h2, where h2 ≥ 0.2 mm. For example, h2 can be 0.2 mm, 0.25 mm, or 0.3 mm. If h2 < 0.2 mm, it may not meet the requirements for accommodating the welding trajectory, thus affecting the subsequent welding between the riveting assembly 20 and the busbar. In the second direction X, the width of the fourth step surface 218 is w1, where w2 ≥ 0.5 mm. For example, w2 can be 0.5 mm, 0.6 mm, or 0.7 mm. If w2 < 0.5 mm, the aforementioned welding trajectory will extend beyond the fourth step surface 218 and accumulate upwards, thus affecting the welding between the riveting assembly 20 and the busbar in subsequent processes.

[0057] In some embodiments, the pole post 30 includes a pole post body 31 and a pole post bottom 32. The pole post body 31 is connected to the pole post bottom 32 and extends through the cover plate body 10 to enter the fixing groove 210.

[0058] In some embodiments, the battery cover further includes a sealing ring 40 and an insulating assembly 50. The insulating assembly 50 includes an upper insulating member and a lower insulating member, which are arranged on opposite sides of the cover body 10 in the thickness direction of the cover body 10. The terminal post 30 passes through the lower insulating member, the cover body 10, and the upper insulating member in sequence to extend into the fixing groove 210. The sealing ring 40 is sleeved around the periphery of the terminal post body 31. The sealing ring 40 and the insulating assembly provide insulation between the terminal post 30 and the cover body 10.

[0059] This embodiment of the invention provides an exemplary description of the assembly process of the battery cover. Of course, in actual applications, the specific assembly process can be adjusted and is not limited to the following process.

[0060] First, the sealing ring 40, the original pole (i.e., the undeformed pole before being riveted to the riveting member 21), the insulating assembly, and the riveting member 21 are assembled such that one end of the original pole extends into the fixing groove 210 of the riveting member 21 (at this time, this end extends at least into the third groove 213). Then, the original pole is riveted to expand it so that it is only accommodated in the first groove 211 and riveted to the first stepped surface 215. During this process, the original pole deforms due to the riveting to obtain the pole 30. Next, the top of the contact surface between the pole 30 and the first groove 211 (corresponding to the edge of the second stepped surface 216 facing the first groove 211) is welded. Finally, the sealing member 22 is placed in the second groove 212 (and supported on the second stepped surface 216), and the sealing member 22 is welded to the second groove 212. The riveting component 21, after being welded with the sealing element 22, constitutes the riveting assembly 20, which is equipped with the fixing groove 210, and then the battery cover is assembled.

[0061] This invention also provides a battery that includes the battery cover as described above. For example, the battery is a blade battery.

[0062] The battery of this embodiment has improved overall reliability and quality due to the assembly of the aforementioned battery cover.

[0063] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery cover plate, characterized by, include: Cover plate body; A riveting assembly is located on one side of the cover plate body in a first direction. The riveting assembly includes a riveting member and at least one sealing member. The riveting member has at least one fixing groove that penetrates the riveting member in the first direction. The sealing member is located in the fixing groove and is welded to the side wall of the fixing groove. At least one pole extends through the cover plate body into the fixing groove, and the pole is riveted to the inner wall of the fixing groove.

2. The battery cover according to claim 1, characterized in that: The riveting component is made of a first metal material, and the sealing component is made of a second metal material. The first metal material and the second metal material may be the same or different. The effective weld penetration depth of the seal to the side wall of the fixing groove is greater than or equal to 0.3 mm.

3. The battery cover plate of claim 2, wherein: In the second direction, the cross-sectional shape of the fixing groove is circular, and the second direction is perpendicular to the first direction; The fixing groove includes a first groove and a second groove, the second groove is located on the side of the first groove away from the cover plate body, and the diameter of the second groove is larger than the diameter of the first groove. The inner wall of the first groove has a first stepped surface, and the pole extends into the first groove and is riveted to the first stepped surface; The seal is located inside the second groove and is welded to the side wall of the second groove.

4. The battery cover plate of claim 3, wherein: Before the seal is welded to the sidewall of the second groove, the distance between the seal and the sidewall of the second groove is less than or equal to 0.15 mm; and / or, In the first direction, the thickness of the seal is t, where 0.3mm ≤ t ≤ 0.5mm.

5. The battery cover plate of claim 3, wherein: The fixing groove further includes a third groove portion, which is connected between the first groove portion and the second groove portion in the first direction, and the diameter of the third groove portion is larger than the diameter of the first groove portion. The third groove exposes a portion of the rivet located around the periphery of the first groove to form a second stepped surface, and the pole post is also welded to the edge of the second stepped surface facing the first groove.

6. The battery cover plate of claim 5, wherein: In the first direction, the depth of the third groove is h1, where h1 ≥ 0.2 mm; and / or, In the second direction, the width of the second step surface is w1, where w1 ≥ 0.5 mm.

7. The battery cover plate of claim 5, wherein: The diameter of the second groove is larger than the diameter of the third groove. The second groove exposes a portion of the rivet located on the periphery of the third groove to form a third stepped surface, and the seal is supported on the third stepped surface.

8. The battery cover plate of claim 7, wherein: The fixing groove further includes a fourth groove portion, which is located on the side of the second groove portion away from the first groove portion; The diameter of the fourth groove is larger than the diameter of the third groove, and the fourth groove exposes a portion of the rivet located around the third groove to form a fourth stepped surface; The seal is welded to the edge of the fourth step facing the third groove.

9. The battery cover according to claim 8, characterized in that: In the first direction, the depth of the fourth groove is h2, where h2 ≥ 0.2 mm; and / or, In the second direction, the fourth step surface has a width w2, w2≥0.5mm.

10. A battery, characterized by: The battery comprises a battery cover plate as claimed in any of claims 1-9.

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