Battery cover plate and battery

Abstract

The utility model 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, a pole assembly and a limiting ring, and the cover plate body is provided with a through hole penetrating through the cover plate body along a first direction. The pole assembly comprises a pole body and a riveting part, the riveting part is connected with one end of the pole body in the first direction, and the riveting part sequentially penetrates through the through hole and the limiting ring and is riveted with the limiting ring. The pole body is provided with a placement groove, and the groove wall of the placement groove is provided with an insertion hole, so that the pole lug can extend into the placement groove through the insertion hole and is attached to the inner wall of the placement groove. According to the battery cover plate and the battery provided by the invention, the utilization rate of the internal space of the battery is improved, the possibility is provided for improving the energy density of the battery, the stability of the pole in the use process of the battery is ensured, the risk of loosening or falling of the pole is reduced, and the reliability of the battery is improved.

Description

Battery cover and battery 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] The tabs and terminals act as bridges connecting the internal electrodes of a battery to the external circuitry, carrying current and enabling the battery to charge and discharge. In the battery industry, the connection method between the tabs and terminals is a key factor affecting battery performance and space utilization. Traditionally, when connecting tabs and terminals, the tabs are typically bent to fit snugly against the bottom surface of the terminal to increase the current-carrying area.

[0003] However, bending the tabs requires sufficient space in a specific area of ​​the battery casing to complete the bending operation. This reserved space is usually located at the top or bottom of the battery, or near the terminals, thus occupying a significant amount of space inside the battery that could otherwise be used to house other components. This severely restricts the layout of other components inside the battery and may also affect the battery's energy density.

[0004] Furthermore, currently, most battery covers on the market use welding or bolting to connect the terminals and the cover. Welding requires high-precision welding technology and may cause thermal damage to the terminals and cover during the welding process, affecting their performance. While bolting is relatively convenient for installation and disassembly, it is prone to loosening due to vibration and other factors during long-term use, leading to unstable connections. Summary of the Invention

[0005] The purpose of this application is to provide a battery cover and battery to address, to some extent, the technical problem in the prior art where sufficient space needs to be reserved in a specific area of ​​the battery casing to complete the bending operation of the electrode tabs. This reserved space is usually located at the top or bottom of the battery, or near the terminal post, which significantly occupies the space inside the battery that could otherwise be used to arrange other components. This severely restricts the layout of other components inside the battery, may affect the energy density of the battery, and requires a high level of welding technology, which may cause thermal damage to the terminal post and cover during welding. Furthermore, bolted connections are prone to loosening due to factors such as vibration, leading to unstable connections.

[0006] According to a first aspect of this application, a battery cover is provided, the battery cover including a cover body, an electrode post assembly and a limiting ring, wherein the cover body is provided with a through hole extending through the cover body in a first direction;

[0007] The pole assembly includes a pole body and a riveting part. The riveting part is connected to one end of the pole body in the first direction. The riveting part passes through the through hole and the limiting ring in sequence and is riveted to the limiting ring.

[0008] The pole body is provided with a mounting groove, and the groove wall is provided with an insertion hole so that the electrode tab can be inserted into the mounting groove through the insertion hole and fit against the inner wall of the mounting groove.

[0009] Preferably, the pole assembly further includes a limiting flange, which is fixedly disposed at the end of the pole body away from the riveting portion in the first direction, and the limiting ring can be connected to the end of the pole body away from the limiting flange to limit the cover plate body between the limiting flange and the limiting ring.

[0010] Preferably, the riveting portion is a thin-walled structure extending along the first direction, and the thin-walled structure is disposed around the inner wall of the limiting ring;

[0011] The thin-walled structure is continuously arranged around the inner wall of the limiting ring for one circumference;

[0012] Alternatively, the thin-walled structures are spaced apart along the inner wall of the limiting ring.

[0013] Preferably, the wall thickness t of the thin-walled structure is 1.5 mm to 2.5 mm.

[0014] Preferably, a riveting groove is provided on the side of the inner edge of the limiting ring that is opposite to the pole body;

[0015] The portion of the riveting part extending along the first direction to the riveting groove can be bent into the riveting groove under the action of external force.

[0016] Preferably, the dimension L of the riveting groove in the first direction is 0.5mm to 1.5mm;

[0017] The width W of the riveting groove is 0.3mm to 1.2mm.

[0018] Preferably, the dimension T of the limiting ring in the first direction is 1.2mm to 2.5mm.

[0019] Preferably, the mounting groove has an operating port at one end of the pole body away from the limiting ring;

[0020] The battery cover also includes:

[0021] A sealing plate that can cover the operating port;

[0022] An insulating component is disposed between the cover plate body and the pole body.

[0023] According to a second aspect of this application, a battery is provided, including a casing, an electrode assembly, and a battery cover as described in any of the above-mentioned technical solutions, thus possessing all the beneficial technical effects of the battery cover, which will not be repeated here.

[0024] The electrode assembly is disposed on the housing, and the battery cover is disposed on one end of the housing in the first direction.

[0025] Preferably, a plurality of electrode groups are disposed within the housing, and the plurality of electrode groups are stacked along a second direction, the second direction intersecting the first direction;

[0026] The bottom wall of the placement groove is provided with a plurality of insertion holes, which are spaced apart along the second direction.

[0027] Compared with the prior art, the beneficial effects of this application are as follows:

[0028] The battery cover provided in this application, on the one hand, by setting a mounting groove on the terminal body and setting insertion holes in the groove wall, allows the electrode tabs to directly extend into the mounting groove and fit against the inner wall through the insertion holes, eliminating the need to bend the electrode tabs to increase the contact area with the bottom surface of the terminal, thereby greatly reducing the space occupied by bending the electrode tabs inside the battery casing. This allows more space inside the battery to be used for arranging other components, improving the utilization rate of the battery's internal space and providing the possibility of increasing the battery's energy density. On the other hand, through the riveting of the riveting part and the limiting ring, the terminal assembly is firmly fixed to the cover body, effectively resisting the effects of vibration, external impact, and other factors, ensuring the stability of the terminal during battery use, reducing the risk of the terminal loosening or falling off, and improving the reliability of the battery.

[0029] 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

[0030] 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.

[0031] Figure 1 is a front view of the battery cover provided in an embodiment of this application;

[0032] Figure 2 is a schematic diagram of the cross-sectional structure obtained by cutting the battery provided in Figure 1 along the AA direction;

[0033] Figure 3 is a schematic diagram of the cross-sectional structure obtained by cutting the battery along the BB direction provided in Figure 1;

[0034] Figure 4 is a schematic diagram of the isometric structure of the battery provided in an embodiment of this application;

[0035] Figure 5 is a schematic diagram of the cross-sectional structure obtained by cutting the battery along the CC direction as shown in Figure 4;

[0036] Figure 6 is a magnified structural diagram of the battery at point D provided in Figure 5;

[0037] Figure 7 is an enlarged structural diagram of the battery at point E shown in Figure 6;

[0038] Figure 8 is a cross-sectional view of the pole assembly provided in the embodiment of this application before riveting;

[0039] Figure 9 is a cross-sectional view of the pole assembly provided in the embodiment of this application after riveting;

[0040] Figure 10 is an isometric structural diagram of the pole post assembly provided in the embodiment of this application before riveting;

[0041] Figure 11 is a schematic diagram of the isometric structure of the pole assembly provided in the embodiment of this application after riveting.

[0042] Figure label:

[0043] 1-Cover plate body; 21-Pole post assembly; 210-Installation groove; 211-Pole post body; 212-Riveting part; 213-Limiting flange; 214-Covering part; 215-Insertion hole; 22-Limiting ring; 23-Sealing plate; 3-Insulation assembly; 31-First insulation ring; 32-Second insulation ring; 4-Pole group; 41-Pole tab; 5-Housing.

[0044] F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The battery cover and battery according to some embodiments of this application are described below with reference to Figures 1 to 11.

[0051] Referring to Figures 1 to 11, an embodiment of the first aspect of this application provides a battery cover, wherein the battery cover includes a cover body 1, a terminal post assembly 21, and a limiting ring 22. The cover body 1 is provided with a through hole extending through the cover body 1 along a first direction F1. The terminal post assembly 21 includes a terminal post body 211 and a riveting portion 212. The riveting portion 212 is connected to one end of the terminal post body 211 in the first direction F1. The riveting portion 212 passes through the through hole and the limiting ring 22 in sequence and is riveted to the limiting ring 22. The terminal post body 211 is provided with a mounting groove 210. The groove wall of the mounting groove 210 is provided with an insertion hole 215 so that the electrode tab 41 can extend into the mounting groove 210 through the insertion hole 215 and fit against the inner wall of the mounting groove 210.

[0052] According to the battery cover plate provided by the above-mentioned technical features, on the one hand, by providing a mounting groove 210 on the terminal body 211 and an insertion hole 215 on the groove wall, the electrode tab 41 can directly extend into the mounting groove 210 and fit against the inner wall through the insertion hole 215, without having to bend the electrode tab 41 to increase the contact area with the bottom surface of the terminal, thereby greatly reducing the space occupied inside the battery case due to bending the electrode tab 41. This allows more space inside the battery to be used for arranging other components, improving the utilization rate of the battery's internal space and providing the possibility of increasing the battery's energy density. On the other hand, by riveting the riveting part 212 and the limiting ring 22, the terminal assembly 21 is firmly fixed to the cover plate body 1, which can effectively resist the influence of factors such as vibration and external impact, ensure the stability of the terminal during battery use, reduce the risk of the terminal loosening or falling off, and improve the reliability of the battery.

[0053] Preferably, as shown in Figures 2, 3 and 5 to 9, the bottom wall of the mounting groove 210 can be a plane so that the tab 41 inserted into the mounting groove 210 fits against the bottom wall.

[0054] As shown in Figures 5 to 9, the figures show an example of the above-mentioned mounting groove 210 being a cuboid groove. However, it is not limited to this. As long as it can accommodate the tab 41 and facilitate the tab 41 to fit against the inner wall of the mounting groove 210, the above-mentioned mounting groove 210 can also be a cylindrical groove, an elliptical cylindrical groove, a polygonal prism groove, or other irregularly shaped grooves.

[0055] As shown in Figures 1 to 8, F1 can be an example of the first direction F1 described above. Taking the battery shown in Figures 1 to 7 as a square battery as an example, two mutually perpendicular directions on the plane perpendicular to the first direction F1 are defined as the second direction F2 and the third direction F3, respectively. F2 shown in the figures can be an example of the second direction F2, and F3 shown in the figures can be an example of the third direction F3. Preferably, the first direction F1 can be the length direction of the square battery, the second direction F2 can be the thickness direction of the square battery, and the third direction F3 can be the width direction of the square battery. However, it is not limited to this, and the battery cover can also be applied to other batteries.

[0056] Preferably, as shown in Figures 8 to 11, the riveting part 212 can be a thin-walled structure extending along the first direction F1. This thin-walled structure is arranged around the inner wall of the limiting ring 22 so that the riveting part 212 can be deformed during the riveting process, that is, the structure of the riveting part 212 shown in Figures 8 and 10 is transformed into the structure of the riveting part 212 shown in Figures 9 and 11.

[0057] Preferably, as shown in FIG10, the thin-walled structure can be continuously arranged around the inner wall of the limiting ring 22 to improve the riveting stability between the riveting part 212 and the limiting ring 22.

[0058] However, it is not limited to this. As not shown in the figure, the thin-walled structure described above can also be spaced along the inner wall of the limiting ring 22 to further facilitate the deformation of the thin-walled structure during the riveting process.

[0059] Preferably, as shown in Figure 7, the wall thickness t of the thin-walled structure can be 1.5mm to 2.5mm, which not only ensures the connection stability and riveting strength of the thin-walled structure, but also facilitates the deformation of the thin-walled structure during the riveting process.

[0060] Preferably, as shown in Figures 5 to 7, a riveting groove is provided on the side of the inner edge of the limiting ring 22 that is opposite to the pole body 211. The part of the riveting portion 212 extending into the riveting groove along the first direction F1 can be bent into the riveting groove under the action of external force. In this way, the part of the riveting portion 212 that bends after riveting can be effectively hidden in the riveting groove, thereby ensuring the flatness of the side of the pole assembly 21 facing the inside of the housing 5, so as to avoid the riveting portion 212 scratching the tab 41.

[0061] Preferably, as shown in FIG7, the dimension L of the above-mentioned riveting groove in the first direction F1 can be 0.5mm to 1.5mm, so as to ensure that the riveting groove has enough space to accommodate the part of the riveting portion 212 that bends after riveting.

[0062] Preferably, as shown in Figure 7, the groove width W of the riveting groove can be 0.3mm to 1.2mm to ensure the riveting strength between the riveting part 212 and the limiting ring 22.

[0063] Preferably, as shown in FIG7, the dimension T of the limiting ring 22 in the first direction F1 can be 1.2mm to 2.5mm to ensure the limiting strength of the limiting ring 22 on the pole assembly 21.

[0064] In a preferred embodiment, as shown in Figures 2, 3, 5, and 6, the pole post assembly 21 further includes a limiting flange 213. The limiting flange 213 is fixedly disposed at one end of the pole post body 211 in the first direction F1, away from the riveting portion 212. The limiting ring 22 can be connected to one end of the pole post body 211 away from the limiting flange 213 to limit the cover plate body 1 between the limiting flange 213 and the limiting ring 22, thereby providing positioning and limiting functions for the installation of the pole post assembly 21 and the cover plate body 1. During installation, the limiting flange 213 can accurately determine the position of the pole post body 211, preventing relative displacement in the first direction F1 during use, thus improving the stability and reliability of the connection between the pole post assembly 21 and the cover plate body 1.

[0065] Preferably, as shown in Figures 2 and 3, the mounting groove 210 has an operating opening at one end where the limiting flange 213 of the pole body 211 is located, so as to facilitate the assembly operation of the tab 41 and the pole body 211 (e.g., inserting the tab 41 into the mounting groove 210, adjusting the position of the tab 41 in the mounting groove 210, bending the tab 41 in the mounting groove 210, welding the tab 41 to the groove wall of the mounting groove 210, etc.), which improves the assembly accuracy of the tab 41 and the convenience of assembling the tab 41 and the pole body 211.

[0066] Preferably, as shown in Figures 4 to 6, the terminal assembly 21 may further include a sealing plate 23, which can cover the operation port. On the one hand, after the assembly of the tab 41 and the terminal body 211 is completed, the sealing plate 23 seals the placement groove 210 to prevent external impurities, moisture, etc. from entering the placement groove 210 and affecting the connection performance between the tab 41 and the terminal body 211, thus ensuring the sealing and stability of the battery and improving the reliability and service life of the battery. On the other hand, it ensures the flatness of the top of the terminal assembly 21 to increase the connection area between the terminal assembly 21 and the external electrical connector.

[0067] Preferably, as shown in Figures 2 and 6, the aforementioned terminal assembly 21 may further include a covering portion 214, which surrounds the outer edge of the limiting flange 213. The outer sidewall of the sealing plate 23 is in contact with the inner sidewall of the covering portion 214. Thus, on the one hand, the covering portion 214 effectively positions the sealing plate 23, improving its positioning accuracy; on the other hand, it further enhances the tightness and sealing between the sealing plate 23 and the terminal body 211. This prevents liquid or gas leakage from the connection between the sealing plate 23 and the terminal body 211, improving the overall sealing performance of the battery.

[0068] Preferably, as shown in FIG6, the sealing plate 23 overlaps with the limiting flange 213, and the outer side wall of the sealing plate 23 and the inner side wall of the covering part 214 can be welded together to increase the contact area between the sealing plate 23 and the pole assembly 21 and ensure the flow area of ​​the sealing plate 23.

[0069] Preferably, as shown in Figures 2 and 6, the covering part 214, the limiting flange 213 and the body of the pole assembly 4 can be an integral connecting part, such as an integral stamping part or an integral casting part, to provide the connection stability and conductivity consistency of the pole assembly 21.

[0070] Preferably, as shown in Figures 5 to 11, when the pole post assembly 21 is projected along the first direction F1 onto a plane perpendicular to the first direction F1, the projection of the inner edge of the limiting ring 22 falls completely within the projection of the pole post body 211. In other words, the inner edge area of ​​the limiting ring 22 is smaller than the end face area of ​​the pole post body 211 near the limiting ring 22. That is, a boss is formed at the connection between the riveting part 212 and the pole post body 211. When the limiting ring 22 is connected to the pole post body 211, on the one hand, the limiting ring 22 can contact the boss and also contact the riveting part 212 through the inner edge of the limiting ring 22, effectively increasing the contact area. On the other hand, the limiting ring 22 can be effectively clamped by the boss and the bent part of the riveting part 212 after riveting, which can further improve the setting stability of the limiting ring 22 and the positional accuracy in the first direction F1.

[0071] In the embodiments, as shown in Figures 2, 3, 5, and 6, the battery cover may further include an insulating component 3. This insulating component 3 is disposed between the cover body 1 and the terminal body 211. Thus, the insulating component 3 effectively isolates the electrical connection between the cover body 1 and the terminal body 211, preventing electrical faults such as short circuits. This improves the electrical safety of the battery and avoids performance degradation or safety accidents caused by accidental electrical conduction.

[0072] Preferably, as shown in Figures 2, 3, 5 and 6, the insulating component 3 is press-fitted between the cover plate body 1 and the terminal body 211, thereby sealing the gap between the cover plate body 1 and the terminal body 211 through the insulating component 3, so as to further improve the sealing performance of the battery cover.

[0073] Preferably, as shown in Figures 2, 3, 5, and 6, the aforementioned insulating component 3 may include a first insulating ring 31. A portion of the first insulating ring 31 is disposed between the limiting flange 213 and the cover body 1 to prevent current leakage or short circuit through the contact area between the limiting flange 213 and the cover body 1. Simultaneously, the first insulating ring 31 also provides a certain degree of buffering and protection, reducing friction and wear between the 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.

[0074] Preferably, as shown in Figures 2, 3, 5, and 6, another portion of the first insulating ring 31 covers the outer edge of the limiting flange 213, which can more effectively prevent current from being conducted along the outer edge of the limiting flange 213, further improving the insulation effect. At the same time, this covering method can provide a certain degree of protection for the limiting flange 213, preventing it from being eroded and damaged by the external environment, increasing the service life of the limiting flange 213, thereby ensuring the stability and reliability of the connection between the pole body 211 and the cover plate body 1.

[0075] Preferably, as shown in Figures 2, 3, 5, and 6, the aforementioned insulating component 3 may further include a second insulating ring 32. Part of the second insulating ring 32 is disposed in the through hole and connected to the first insulating ring 31. Another part of the second insulating ring 32 is disposed between the battery cover and the limiting ring 22. 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 21 and the cover 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 through hole and between the battery cover and the limiting ring 22, forms a more comprehensive insulation protection system. This not only further isolates the electrical connection between the terminal post body 211 and the cover body 1, but also provides insulation protection for the area between the limiting ring 22 and the battery cover, 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.

[0076] Referring to Figures 4 to 7, an embodiment of the second aspect of this application also provides a battery including the battery cover of any of the above embodiments, and thus possesses all the beneficial technical effects of the battery cover, which will not be repeated here.

[0077] Specifically, as shown in Figures 4 and 5, the battery also includes a housing 5 and an electrode assembly 4, with the electrode assembly 4 disposed on the housing 5, and the battery cover plate covering one end of the housing 5 in the first direction F1.

[0078] Preferably, as shown in FIG5, an example is shown in which two pole groups 4 are arranged inside the housing 5, and the two pole groups 4 are stacked along the second direction F2.

[0079] Correspondingly, as shown in Figures 8 to 11, the bottom wall of the aforementioned mounting groove 210 can be provided with two aforementioned insertion holes 215. The two insertion holes 215 can be spaced apart along the second direction F2 so that the tabs 41 of the aforementioned two pole groups 4 can be inserted into the mounting groove 210 accordingly, thereby realizing the connection of multiple pole groups 4 through the aforementioned pole group 4 body, so as to further avoid the connection structure between multiple pole groups 4 occupying the internal space of the shell.

[0080] Optionally, as shown in Figures 10 and 11, the two insertion holes 215 can be located at both ends of the bottom wall of the mounting groove 210 in the second direction F2. In this way, when the tabs 41 of the two pole groups 4 are inserted into the two insertion holes 215 respectively, as shown in Figure 6, the tabs 41 of the two pole groups 4 can be bent towards each other to fit against the bottom wall of the mounting groove 210.

[0081] However, it is not limited to this. As shown in the figure, one of the two insertion holes 215 can be set at the first end of the bottom wall of the mounting groove 210 in the second direction F2, and the other of the two insertion holes 215 can be set at the middle of the bottom wall of the mounting groove 210 in the second direction F2. In this way, when the tabs 41 of the two pole groups 4 are inserted into the two insertion holes 215 respectively, the tabs 41 of the two pole groups 4 can be bent towards the second end of the bottom wall of the mounting groove 210 in the second direction F2 at the same time to achieve fit with the bottom wall of the mounting groove 210.

[0082] However, this is not the only limitation. 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 215 provided in the mounting groove 210 can also be adjusted according to the number of pole groups 4.

[0083] 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 battery cover includes a cover body, a terminal post assembly, and a limiting ring. The cover body has a through hole extending through the cover body in a first direction. The terminal post assembly includes a terminal post body and a riveting part. The riveting part is connected to one end of the terminal post body in the first direction. The riveting part passes through the through hole and the limiting ring in sequence and is riveted to the limiting ring. The terminal post body has a mounting groove. The groove wall of the mounting groove has an insertion hole so that the electrode tab can be inserted into the mounting groove through the insertion hole and fit against the inner wall of the mounting groove.

2. The battery cover according to claim 1, characterized in that, The pole assembly further includes a limiting flange, which is fixedly disposed at the end of the pole body away from the riveting portion in the first direction. The limiting ring can be connected to the end of the pole body away from the limiting flange to limit the cover plate body between the limiting flange and the limiting ring.

3. The battery cover according to claim 1, characterized in that, The riveting part is a thin-walled structure extending along the first direction, and the thin-walled structure is arranged around the inner wall of the limiting ring; the thin-walled structure is continuously arranged around the inner wall of the limiting ring; or, the thin-walled structure is arranged at intervals along the inner wall of the limiting ring.

4. The battery cover according to claim 3, characterized in that, The wall thickness t of the thin-walled structure is 1.5mm to 2.5mm.

5. The battery cover according to claim 1, characterized in that, A riveting groove is provided on the side of the inner edge of the limiting ring that is opposite to the pole body; the portion of the riveting part that extends along the first direction to the riveting groove can be bent into the riveting groove under the action of external force.

6. The battery cover according to claim 5, characterized in that, The dimension L of the riveting groove in the first direction is 0.5mm to 1.5mm; the groove width W of the riveting groove is 0.3mm to 1.2mm.

7. The battery cover according to claim 1, characterized in that, The dimension T of the limiting ring in the first direction is 1.2mm to 2.5mm.

8. The battery cover according to any one of claims 1 to 7, characterized in that, The mounting groove has an operating opening at one end of the electrode body away from the limiting ring; the battery cover also includes: a sealing plate that can cover the operating opening; and an insulating component disposed between the cover body and the electrode body.

9. A battery, characterized in that, The device includes a housing, an electrode assembly, and a battery cover plate according to any one of claims 1 to 8, wherein the electrode assembly is disposed on the housing, and the battery cover plate covers one end of the housing in the first direction.

10. The battery according to claim 9, characterized in that, The housing contains a plurality of electrode groups, which are stacked along a second direction that intersects with the first direction; the bottom wall of the mounting groove contains a plurality of insertion holes, which are spaced apart along the second direction.

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