Battery cover plate and battery

Abstract

The application relates to the technical field of batteries, in particular to a battery cover plate and a battery. The battery cover plate comprises a cover plate body and a pole post assembly. The cover plate body is arranged at a mounting hole penetrating through the cover plate body along a first direction. The pole post assembly comprises a first connecting piece and a second connecting piece. The first connecting piece comprises a first fitting part, a first insertion part and a first limiting flange. The second connecting piece comprises a second fitting part, a second insertion part and a second limiting flange. The first insertion part and the second insertion part can be respectively inserted into the mounting hole from two sides of the cover plate body in the first direction. The first fitting part and the second fitting part are fitted with each other in the mounting hole. The cover plate body is limited between the first limiting flange and the second limiting flange. According to the battery cover plate and the battery, the contact area between the connecting pieces is increased. The stability and reliability of the battery as a whole are improved. The sealing performance between the pole post assembly and the cover plate body is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cover and a battery. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for their performance and safety. Batteries need higher overcurrent capacity, better stability, and reliability to meet the demands of fast charging and high energy output in electric vehicles, as well as the long-term stable operation requirements of energy storage systems. As a crucial conductive component in the battery, the connection method between the terminals and the rivet blocks directly affects the overall performance of the battery.

[0003] Currently, to improve battery energy density, the riveting block is typically designed in a ring shape and fitted onto one end of the terminal post to secure it. However, this method of connecting the terminal post with a ring-shaped riveting block significantly reduces the connection area between the terminal post and the riveting block. When the current is high during battery charging and discharging, the small connection area leads to excessive current density, increased resistance, and thus more heat generation, affecting the battery's overcurrent capacity and efficiency, and potentially causing safety issues. Furthermore, the riveting effect between the terminal post and the riveting block is poor, resulting in problems such as plastic cracking, poor welding quality, low production yield, and a high risk of incomplete soldering. Summary of the Invention

[0004] The purpose of this application is to provide a battery cover and battery to address, to some extent, the existing connection method of using annular riveting blocks to attach terminals, which significantly reduces the connection area between the terminals and the riveting blocks. When the current is high during battery charging and discharging, the small connection area leads to excessive current density, increased resistance, and thus more heat generation, affecting the battery's overcurrent capacity and efficiency. Furthermore, the riveting effect between the terminals and the riveting blocks is poor, resulting in technical problems such as plastic cracking, poor welding effect, low production yield, and a high risk of incomplete soldering.

[0005] According to a first aspect of this application, a battery cover is provided, including a cover body and a terminal post assembly, wherein the cover body is disposed in a mounting hole extending through the cover body along a first direction, and the terminal post assembly includes a first connector and a second connector.

[0006] The first connector includes a first fitting part, a first insertion part, and a first limiting flange. The first insertion part extends along the first direction. The first fitting part and the first limiting flange are respectively fixed to both ends of the first insertion part, and the first limiting flange is disposed on the outer edge of the first insertion part.

[0007] The second connector includes a second fitting part, a second insertion part, and a second limiting flange. The second insertion part extends along the first direction. The second fitting part and the second limiting flange are respectively fixed to both ends of the second insertion part, and the second limiting flange is disposed on the outer edge of the second insertion part.

[0008] Both the first insertion part and the second insertion part can be inserted into the mounting hole from both sides of the cover plate body in the first direction, and the first fitting part and the second fitting part fit together in the mounting hole, and the cover plate body is limited between the first limiting flange and the second limiting flange.

[0009] Preferably, the first insertion part is cylindrical, and the first fitting part seals one end of the first insertion part;

[0010] Both the first and second fitting parts have corresponding insertion holes for the tabs to pass through.

[0011] Preferably, the electrode tab passes through the second fitting portion and the first fitting portion in sequence, and the electrode tab is fitted to the side of the first fitting portion opposite to the second fitting portion.

[0012] Preferably, the second insertion part is cylindrical, and the second fitting part blocks one end of the second insertion part.

[0013] Preferably, the pole assembly further includes a sealing plate, which covers the end of the first insertion portion away from the first fitting portion.

[0014] Preferably, the sealing plate includes a covering portion and an overlapping portion. The covering portion covers the end of the first insertion portion away from the first fitting portion, and the overlapping portion is disposed around the covering portion and overlaps with the first limiting flange.

[0015] Preferably, it further includes an insulating component disposed between the cover plate body and the pole assembly.

[0016] Preferably, the insulating component includes a first insulating ring, at least a portion of which is disposed between the first limiting flange and the cover plate body.

[0017] Preferably, the insulating component includes a second insulating ring, a portion of which is disposed in the mounting hole and connected to the first insulating ring, and another portion of which is disposed between the cover plate body and the second limiting flange.

[0018] According to a second aspect of this application, a battery is provided, including the battery cover plate described in any of the above technical solutions, and thus has all the beneficial technical effects of the battery cover plate, which will not be repeated here.

[0019] Compared with the prior art, the beneficial effects of this application are as follows:

[0020] The battery cover provided in this application, through the first and second fitting parts being fitted within the mounting holes, significantly increases the contact area between the connecting parts compared to the traditional method of using rivets on annular riveting blocks. The larger connection area helps reduce resistance during current flow, decreases heat generation, and thus improves the battery's overcurrent capacity, enabling the battery to operate more efficiently during charging and discharging, thereby enhancing battery performance. The first and second connecting parts are inserted into the mounting holes from both sides of the cover body, with the first and second fitting parts fitting together within the mounting holes. Simultaneously, the cover body is confined between the first and second limiting flanges. This structure creates a stable connection between the terminal assembly and the cover body. Compared to traditional connection methods, it can better withstand various stresses generated during battery use, reducing the risk of failure due to loose connections and improving the overall stability and reliability of the battery. Furthermore, it effectively improves the sealing performance between the terminal assembly and the cover body, preventing electrolyte leakage and other problems.

[0021] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A front view structural diagram of the battery cover provided in an embodiment of this application;

[0024] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure obtained by cutting the provided battery cover along the AA direction;

[0025] Figure 3 This is an isometric structural diagram of the battery provided in an embodiment of this application;

[0026] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of the provided battery;

[0027] Figure 5 for Figure 4 An enlarged structural diagram of the provided battery cover at point B.

[0028] Figure label:

[0029] 1-Cover plate body; 11-Explosion-proof valve; 12-Injection hole; 2-Pole post assembly; 21-First connector; 211-First fitting part; 212-First insertion part; 213-First limiting flange; 214-Edge part; 22-Second connector; 221-Second fitting part; 222-Second insertion part; 223-Second limiting flange; 23-Sealing plate; 231-Covering part; 232-Overlapping part; 24-Socket; 3-Insulation assembly; 31-First insulating ring; 32-Second insulating ring; 4-Pole group; 41-Pole tab; 5-Housing;

[0030] F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed Implementation

[0031] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0032] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0033] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] The following reference Figures 1 to 4 This application describes a battery cover and a battery according to some embodiments.

[0037] See Figures 1 to 3 As shown, an embodiment of the first aspect of this application provides a battery cover, which includes a cover body 1 and a terminal post assembly 2. The cover body 1 is disposed in a mounting hole extending through the cover body 1 along a first direction F1. The terminal post assembly 2 includes a first connector 21 and a second connector 22. The first connector 21 includes a first fitting portion 211, a first insertion portion 212, and a first limiting flange 213. The first insertion portion 212 extends along the first direction F1. The first fitting portion 211 and the first limiting flange 213 are respectively fixed to both ends of the first insertion portion 212, and the first limiting flange 213 is disposed on the outer edge of the first insertion portion 212. The second connector 22 includes a second fitting portion 221, a second insertion portion 222, and a second limiting flange 223. The second insertion portion 222 extends along the first direction F1. The second fitting portion 221 and the second limiting flange 223 are respectively fixed to both ends of the second insertion portion 222, and the second limiting flange 223 is disposed on the outer edge of the second insertion portion 222. Both the first insertion part 212 and the second insertion part 222 can be inserted into the mounting holes from both sides of the cover plate body 1 in the first direction F1, and the first fitting part 211 and the second fitting part 221 fit together in the mounting holes, and the cover plate body 1 is limited between the first limiting flange 213 and the second limiting flange 223.

[0038] The battery cover plate provided according to the above technical features, through the first fitting part 211 and the second fitting part 221 fitting within the mounting hole, significantly increases the contact area between the connecting parts compared to the traditional method of using a ring-shaped riveting block with rivets. The larger connection area helps reduce resistance when current flows, reduces heat generation, thereby improving the battery's overcurrent capacity and enabling the battery to operate more efficiently during charging and discharging, thus enhancing battery performance. The first connecting part 21 and the second connecting part 22 are inserted into the mounting hole from both sides of the cover plate body 1, with the first fitting part 211 and the second fitting part 221 fitting together within the mounting hole. Simultaneously, the cover plate body 1 is confined between the first limiting flange 213 and the second limiting flange 223. This structure creates a stable connection between the terminal assembly 2 and the cover plate body 1. Compared to traditional connection methods, this better withstands various stresses generated during battery use, reduces the risk of failure due to loose connections, and improves the overall stability and reliability of the battery. Furthermore, it effectively improves the sealing performance between the terminal assembly 2 and the cover plate body 1, preventing problems such as electrolyte leakage.

[0039] like Figures 1 to 5 As shown in the figure, F1 can be an example of the first direction F1 described above. Figures 1 to 5 The diagram illustrates an example of the battery cover being applied to a square battery; however, it is not limited to this example. The battery cover can also be applied to batteries of other shapes, such as cylindrical batteries or other irregularly shaped batteries. For ease of description, two mutually perpendicular directions on a plane perpendicular to the first direction F1 are defined as the second direction F2 and the third direction F3, respectively. F2 shown in the figure can be an example of the second direction F2, and F3 shown in the figure can be an example of the third direction F3.

[0040] Preferably, such as Figure 2 , Figure 4 and Figure 5 As shown, the first insertion part 212 can be cylindrical. In other words, the interior of the first insertion part forms a hollow space, which can effectively reduce the amount of material used, thereby reducing the weight of the entire pole assembly 2.

[0041] like Figure 1 and Figure 3 As shown in the figure, an example is shown in which the first insertion part 212 and the second insertion part 222 are both in the shape of a square cylinder. However, it is not limited to this. The first insertion part 212 and the second insertion part 222 can also be in the shape of a cylindrical cylinder, an elliptical cylinder, a polygonal cylinder, or other irregular cylindrical shapes.

[0042] Preferably, such as Figure 2 , Figure 4 and Figure 5As shown, the first fitting portion 211 can block one end of the first insertion portion 212. In other words, the other end of the first insertion portion 212 is open to facilitate the assembly of the tab 41 and the first fitting portion 211.

[0043] Preferably, such as Figure 2 , Figure 4 and Figure 5 As shown, the first fitting part 211, the first insertion part 212 and the first limiting flange 213 can be integrally formed parts (e.g., integral stamping parts, integral casting parts, etc.) to improve the connection strength, stability and sealing of the first connector 21.

[0044] Preferably, such as Figure 2 , Figure 4 and Figure 5 As shown, the first fitting part 211 and the second fitting part 221 are provided with corresponding positions of insertion holes 24 for the electrode tab 41 to pass through, so that the electrode tab 41 can be set in the hollow space inside the first insertion part through the insertion hole 24, and the electrode tab 41 can be set in the hollow space, thereby effectively avoiding the electrode tab 41 occupying the internal space of the housing 5 and further improving the utilization rate of the internal space of the housing 5.

[0045] Preferably, such as Figure 4 and Figure 5 As shown, the aforementioned tab 41 can sequentially penetrate the second bonding portion 221 and the first bonding portion 211, and the tab 41 is bonded to the side of the first bonding portion 211 opposite to the second bonding portion 221. This connection method creates a more direct and tighter electrical connection between the tab 41 and the terminal assembly 2. This effectively reduces contact resistance, decreases energy loss during power transmission, improves battery charging and discharging efficiency, and ensures stable power output during battery operation. It also increases the contact area and connection strength between the tab 41 and the terminal assembly 2, better withstanding current stress and mechanical vibration generated during charging and discharging, reducing the risk of loosening or detachment of the tab 41 and the terminal assembly 2, and improving the reliability and stability of the battery's electrical connection.

[0046] Furthermore, such as Figure 2 , Figure 4 and Figure 5 As shown, the second insertion part 222 can also be cylindrical to further reduce the amount of material used in the pole assembly 2, thereby reducing the weight of the entire pole assembly 2.

[0047] Correspondingly, such as Figure 2 , Figure 4 and Figure 5As shown, the second fitting part 221 blocks one end of the second insertion part 222 to ensure a tight fit between the first fitting part 211 and the second fitting part 221.

[0048] Similarly, such as Figure 2 , Figure 4 and Figure 5 As shown, the second fitting part 221, the second insertion part 222, and the second limiting flange 223 can be integrally formed parts (e.g., integral stamping parts, integral casting parts, etc.) to improve the connection strength, stability, and sealing of the second connector 22.

[0049] Preferably, such as Figure 2 , Figure 4 and Figure 5 As shown, the pole assembly 2 may also include a sealing plate 23, which can cover the end of the first insertion portion 212 away from the first fitting portion 211 to ensure the flatness of the outer surface of the pole assembly 2, thereby facilitating the electrical connection between the pole assembly 2 and the external electrical connector.

[0050] Preferably, such as Figure 4 and Figure 5 As shown, the sealing plate 23 may include a covering portion 231 and an overlapping portion 232. The covering portion 231 covers the end of the first insertion portion 212 away from the first fitting portion 211. The overlapping portion 232 is arranged around the covering portion 231 and overlaps with the first limiting flange 213. On the one hand, the overlap between the overlapping portion 232 and the first limiting flange 213 effectively improves the stability of the arrangement between the sealing plate 23 and the first connecting member 21. On the other hand, the overlapping portion 232 can effectively change the orientation of the joint between the sealing plate 23 and the first connecting member 21, thereby effectively improving the sealing performance between the sealing plate 23 and the first connecting member 21.

[0051] Preferably, such as Figure 4 and Figure 5 As shown, at least a portion of the covering portion 231 can be inserted into the hollow space inside the first insertion portion 212 along the first direction F1 to improve the assembly accuracy between the sealing plate 23 and the first connector 21.

[0052] Preferably, such as Figure 4 and Figure 5As shown, the first connector 21 may further include an edge-wrapping portion 214, which is fixed to the side of the first limiting flange 213 facing away from the second connector 22. The edge-wrapping portion 214 is arranged around the sealing plate 23. The outer wall of the overlapping portion 232 is in contact with the inner wall of the edge-wrapping portion 214. On the one hand, the edge-wrapping portion 214 can further improve the assembly accuracy between the sealing plate 23 and the first connector 21. On the other hand, the contact between the outer wall of the overlapping portion 232 and the inner wall of the edge-wrapping portion 214 not only facilitates the connection operation between the first connector 21 and the sealing plate 23, but also effectively improves the sealing performance between the sealing plate 23 and the first connector 21.

[0053] Preferably, such as Figure 2 , Figure 4 and Figure 5 As shown, the aforementioned edge-wrapping portion 214, the aforementioned first fitting portion 211, the first insertion portion 212, and the first limiting flange 213 can be integrally formed parts (e.g., integral stamping parts, integral casting parts, etc.) to improve the connection strength, stability, and sealing performance of the first connector 21.

[0054] In an embodiment, such as Figure 2 , Figure 4 and Figure 5 As shown, the battery cover may also include an insulating component 3, which is disposed between the cover body 1 and the terminal assembly 2 to achieve insulation between the cover body 1 and the terminal assembly 2.

[0055] Preferably, such as Figure 5 As shown, the aforementioned insulating component 3 can be press-fitted between the cover plate body 1 and the terminal post body, thereby sealing the gap between the cover plate body 1 and the terminal post assembly 2 and improving the sealing performance of the battery cover.

[0056] Preferably, such as Figure 5 As shown, the aforementioned insulating component 3 may include a first insulating ring 31, at least a portion of which is disposed between the first limiting flange 213 and the cover body 1, preventing current leakage or short circuit through the contact area between the first limiting flange 213 and the cover body 1. Simultaneously, the first insulating ring 31 also provides a certain buffering and protective function, reducing friction and wear between the first limiting flange 213 and the cover body 1, extending the service life of each component of the battery cover, and improving the overall stability of the battery.

[0057] Preferably, such as Figure 5As shown, the first insulating ring 31 partially covers the outer edge of the aforementioned edge-wrapping portion 214, which can more effectively prevent current from being conducted along the outer edge of the edge-wrapping portion 214, further improving the insulation effect. At the same time, this covering method can also provide a certain degree of protection for the edge-wrapping portion 214, preventing it from being corroded and damaged by the external environment, increasing the service life of the edge-wrapping portion 214, thereby ensuring the stability and reliability of the connection between the first connector 21 and the cover plate body 1.

[0058] Preferably, such as Figure 5 As shown, the aforementioned insulating component 3 may further include a second insulating ring 32. A portion of the second insulating ring 32 is disposed in the mounting hole and connected to the first insulating ring 31. Another portion of the second insulating ring 32 is disposed between the cover plate body 1 and the second limiting flange 223. Thus, on the one hand, configuring the insulating component 3 as a separate structure of the first insulating ring 31 and the second insulating ring 32 greatly facilitates the assembly of the insulating component 3 between the terminal post assembly 2 and the cover plate body 1. On the other hand, the connection between the second insulating ring 32 and the first insulating ring 31, and their distribution in the mounting hole and between the cover plate body 1 and the second limiting flange 223, forms a more comprehensive insulation protection system. This not only further isolates the electrical connection between the second connector 22 and the cover plate body 1, but also provides insulation protection for the area between the second connector 22 and the cover plate body 1, greatly improving the battery's insulation performance and electrical safety. Simultaneously, this multi-part insulation design enhances the battery's adaptability to complex environments and reduces the risk of failure due to poor insulation.

[0059] Preferably, such as Figure 1 and Figure 3 As shown, the cover plate body 1 may be equipped with an explosion-proof valve 11.

[0060] Preferably, such as Figure 1 and Figure 3 As shown, the cover plate body 1 may be provided with a liquid injection hole 12.

[0061] like Figure 1 and Figure 3 As shown in the figure, an example of two terminal post assemblies 2 are provided on the cover plate body 1. The two terminal post assemblies 2 can be arranged at intervals along a third direction F3 on the cover plate body 1. However, this is not the only limitation. The number of terminal post assemblies 2 provided on the cover plate body 1 can be adaptively adjusted according to the structure of the battery. For example, the number of terminal post assemblies 2 provided on the cover plate body 1 can also be 1, 3, 4, ... or more.

[0062] See Figures 3 to 5The second aspect of this application also provides a battery including the battery cover described in any of the above embodiments, and thus has all the beneficial technical effects of the battery cover, which will not be repeated here.

[0063] Preferably, such as Figures 3 to 5 As shown, the battery may also include a housing 5 and an electrode group 4, the electrode group 4 being disposed inside the housing 5, and the battery cover being disposed on one end of the housing 5 in the first direction F1.

[0064] Preferably, such as Figure 4 and Figure 5 As shown in the figure, an example of two pole groups 4 are arranged inside the housing 5, and the two pole groups 4 can be stacked along the second direction F2.

[0065] Correspondingly, such as Figure 5 As shown, the first fitting portion 211 can be provided with two insertion holes 24, which can be spaced apart along the second direction F2, so that the tabs 41 of the two pole groups 4 can be inserted into the hollow space of the first insertion portion 212, thereby connecting multiple pole groups 4 through the main body of the pole group 4, so as to further avoid the connection structure between multiple pole groups 4 occupying the internal space of the shell. Correspondingly, as Figure 5 As shown, two of the aforementioned insertion holes 24 can be provided at the corresponding positions of the second fitting part 221, which will not be described in detail here.

[0066] Optionally, such as Figure 5 As shown, the two insertion holes 24 can be disposed at both ends of the first fitting part 211 in the second direction F2. Thus, when the tabs 41 of the two pole groups 4 are inserted into the two insertion holes 24 respectively, the tabs 41 of the two pole groups 4 can be bent towards each other to achieve fitting with the inner side of the first fitting part 211.

[0067] However, it is not limited to this. As shown in the figure, one of the two sockets can be located at the first end of the first fitting part in the second direction, and the other of the two sockets can be located in the middle of the first fitting part in the second direction. In this way, when the tabs of the two pole groups are inserted into the two sockets respectively, the tabs of the two pole groups can be bent towards the second end of the first fitting part in the second direction at the same time to achieve fitting with the first fitting part.

[0068] However, it is not limited to this. The number of pole groups 4 contained in the housing 5 is not limited to the two examples mentioned above. The number of pole groups 4 contained in the housing 5 can be adjusted according to the usage requirements. Correspondingly, the number of insertion holes 24 provided in the first fitting part 211 can also be adjusted adaptively according to the number of pole groups 4.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cover, characterized in that, The device includes a cover plate body and an electrode assembly. The cover plate body is disposed in a mounting hole that extends through the cover plate body along a first direction. The electrode assembly includes a first connector and a second connector. The first connector includes a first fitting part, a first insertion part, and a first limiting flange. The first insertion part extends along the first direction. The first fitting part and the first limiting flange are respectively fixed to both ends of the first insertion part, and the first limiting flange is disposed on the outer edge of the first insertion part. The second connector includes a second fitting part, a second insertion part, and a second limiting flange. The second insertion part extends along the first direction. The second fitting part and the second limiting flange are respectively fixed to both ends of the second insertion part, and the second limiting flange is disposed on the outer edge of the second insertion part. Both the first insertion part and the second insertion part can be inserted into the placement hole from both sides of the cover plate body in the first direction, and the first fitting part and the second fitting part fit together in the placement hole, and the cover plate body is limited between the first limiting flange and the second limiting flange. Both the first and second fitting parts have corresponding insertion holes for the electrode tabs to pass through. The electrode tab passes through the second fitting portion and the first fitting portion in sequence, and the electrode tab is fitted to the side of the first fitting portion opposite to the second fitting portion.

2. The battery cover according to claim 1, characterized in that, The first insertion part is cylindrical, and the first fitting part seals one end of the first insertion part.

3. The battery cover according to claim 2, characterized in that, The second insertion part is cylindrical, and the second fitting part blocks one end of the second insertion part.

4. The battery cover according to claim 2, characterized in that, The pole assembly also includes a sealing plate, which covers the end of the first insertion portion away from the first fitting portion.

5. The battery cover according to claim 4, characterized in that, The sealing plate includes a covering portion and an overlapping portion. The covering portion covers the end of the first insertion portion away from the first fitting portion. The overlapping portion is arranged around the covering portion and overlaps with the first limiting flange.

6. The battery cover according to claim 1, characterized in that, It also includes an insulation component disposed between the cover plate body and the pole assembly.

7. The battery cover according to claim 6, characterized in that, The insulating component includes a first insulating ring, at least a portion of which is disposed between the first limiting flange and the cover plate body.

8. The battery cover according to claim 7, characterized in that, The insulating component includes a second insulating ring, a portion of which is disposed in the mounting hole and connected to the first insulating ring, and another portion of which is disposed between the cover plate body and the second limiting flange.

9. A battery, characterized in that, Includes the battery cover as described in any one of claims 1 to 8.

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