Cover plate structure and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate structure and a battery cell, the cover plate structure comprises a cover plate body, a lower plastic part and a pole assembly, the lower plastic part comprises a top wall, a first enclosure wall and a second enclosure wall, the top wall is arranged along one side of the cover plate body, and the first enclosure wall and the second enclosure wall are respectively arranged along two sides of the top wall in a second direction; the lengths of the first enclosure bulkhead and the second enclosure bulkhead are both greater than or equal to the distance between the pole group of the battery cell and the pole column assembly; or the first enclosure bulkhead and the second enclosure bulkhead are both provided with chamfer parts; or, the length of one of the first enclosure bulkhead and the second enclosure bulkhead in the first direction is greater than or equal to the distance between the pole group and the pole column assembly, and one of the first enclosure bulkhead and the second enclosure bulkhead is provided with a chamfer part. According to the cover plate structure and the battery cell provided by the invention, the pole assembly can be thinned without being limited by the size of the enclosure bulkhead, so that the material cost of the pole assembly is effectively saved, and the space occupied by the pole assembly in the first direction is compressed.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a cover plate structure and an electric core. Background Art

[0002] Currently, an electric core generally includes a housing and a cover plate structure. The cover plate structure is usually disposed on one side of the housing to form a closed space for accommodating the electric core electrode group with the housing. Generally, the cover plate structure includes an aluminum light plate, a pole column, and a lower plastic part. The pole column sequentially penetrates through the aluminum lower plastic part and the plastic plate from the inner side of the housing, and one end of the inner side of the pole column is connected to the tab of the electric core to realize the power transmission of the electrode group inside the electric core to the outside. The lower plastic part usually includes an insulating plate part and an insulating stop edge. Among them, the insulating plate part is attached to the inner side of the aluminum light plate, and the insulating stop edge is disposed at the edge of the insulating plate part and extends towards the inside of the housing along the inner wall of the housing to realize the insulation between the light aluminum plate and the housing and the pole column.

[0003] Generally, the tab needs to be bent inside the housing, which not only facilitates the accommodation of the tab inside the housing, but also enables the tab to be attached to the inner end face of the pole column to ensure the current-carrying area between the tab and the pole column. However, the lower edge of the insulating stop edge of the current lower plastic part is too sharp and is likely to come into contact with the tab inside the housing, resulting in damage to the tab. To avoid the contact between the insulating stop edge and the tab, currently, the lower end of the pole column is usually aligned with the lower end of the insulating stop edge, which is not only not conducive to the thinning of the pole column, but also likely to affect the insulation effect of the insulating stop edge. Summary of the Utility Model

[0004] The purpose of the present application is to provide a cover plate structure and an electric core to solve, to a certain extent, the technical problem in the prior art that in order to avoid the contact between the insulating stop edge and the tab, currently, the lower end of the pole column is usually aligned with the lower end of the insulating stop edge, which is not only not conducive to the thinning of the pole column, but also likely to affect the insulation effect of the insulating stop edge.

[0005] According to a first aspect of the present application, a cover plate structure for an electric core is provided. The cover plate structure includes a cover plate body, a lower plastic part, and a pole column assembly. The lower plastic part includes a top wall, a first surrounding wall, and a second surrounding wall. The top wall is disposed along one side of the cover plate body. The pole column assembly penetrates through the top wall and the cover plate body along a first direction. The first surrounding wall and the second surrounding wall are both disposed on the side of the top wall facing away from the cover plate body, and the first surrounding wall and the second surrounding wall are respectively disposed along the edges of both sides of the top wall in a second direction. A part of the pole column assembly is disposed between the first surrounding wall and the second surrounding wall, and the second direction intersects with the first direction;

[0006] In the first direction, the sizes of both the first surrounding wall and the second surrounding wall are greater than or equal to the distance between the electrode group of the electric core and the pole column assembly;

[0007] Alternatively, chamfered portions are provided on the sides facing the side where the pole column assembly is located at the ends of both the first surrounding wall and the second surrounding wall that face away from the cover plate body in the first direction.

[0008] Alternatively, the length of one of the first surrounding wall and the second surrounding wall in the first direction is greater than or equal to the distance between the pole group and the pole column assembly, and a chamfered portion is provided on the side of one of the first surrounding wall and the second surrounding wall that faces away from the cover plate body in the first direction and faces the side where the pole column assembly is located.

[0009] Preferably, the length of the first surrounding wall in the first direction is greater than or equal to the distance between the pole group and the pole column assembly.

[0010] A chamfered portion is provided on the side of the second surrounding wall that faces away from the cover plate body in the first direction and faces the side where the pole column assembly is located.

[0011] Preferably, the pole group includes a first end and a second end that are oppositely arranged in the second direction, the first surrounding wall is arranged on the side where the first end is located, and the second surrounding wall is arranged on the side where the second end is located.

[0012] A pole tab is led out at the end of the pole group where the cover plate structure is located. The leading-out position of the pole tab is close to the second end, and the pole tab bends from the leading-out position towards the first end so that the pole tab fits against the end of the pole column assembly.

[0013] Preferably, in the first direction, the size of the first surrounding wall is greater than the size of the second surrounding wall.

[0014] Preferably, the difference between the size of the first surrounding wall and the size of the second surrounding wall in the first direction is greater than or equal to 2 mm.

[0015] Preferably, the size of the second surrounding wall in the first direction is 2.5 mm to 3.5 mm.

[0016] And / or, the size of the second surrounding wall in the second direction is 0.8 mm to 5 mm.

[0017] Preferably, the lower plastic part further includes a glue-reducing groove, and the glue-reducing groove is arranged inside the second surrounding wall.

[0018] Preferably, the pole column assembly includes a connecting plate and a pole column that can be riveted to each other. The connecting plate is arranged outside the cover plate body, and the pole column includes a pole column bottom plate and a through portion that extends in the first direction.

[0019] The pole column assembly passes through the cover plate body and is riveted to the connecting plate via the through portion, and the pole column bottom plate is disposed between both the first surrounding wall and the second surrounding wall.

[0020] Preferably, the size of the pole column bottom plate in the first direction is 1 mm to 2 mm.

[0021] According to a second aspect of the present application, there is provided an electric core including the cover plate structure described in any one of the above technical solutions. Therefore, it has all the beneficial technical effects of this cover plate structure and will not be elaborated herein.

[0022] Compared with the prior art, the beneficial effects of the present application are as follows:

[0023] For the cover plate structure provided by the present application, through the structures of the top wall, the first surrounding wall, and the second surrounding wall of the lower plastic part, the part of the pole column assembly that does not penetrate the cover plate body can be effectively insulated from the cover plate body. On the one hand, the size of the first surrounding wall and / or the second surrounding wall in the first direction is designed to be greater than or equal to the distance between the electrode group and the pole column assembly of the electric core, so that the surrounding wall (the first surrounding wall and / or the second surrounding wall) can extend to (or extend beyond) the position where the pole ear is led out, thereby avoiding the contact between the pole ear and the edge of the surrounding wall, and effectively avoiding the risk of the pole ear being damaged by the surrounding wall; on the other hand, chamfered portions are provided on the sides facing the pole column assembly at the ends of the first surrounding wall and / or the second surrounding wall in the first direction that are opposite to the cover plate body to blunt the edges of the surrounding wall (the first surrounding wall and / or the second surrounding wall), so that even if the pole ear contacts the surrounding wall, it will not cause damage to the pole ear. Furthermore, it avoids the current method of making the pole column and the surrounding wall of equal length and using the operation of blocking the surrounding wall, enabling the pole column assembly to be thinned without being limited by the size of the surrounding wall, thereby effectively saving the material cost of the pole column assembly and compressing the space occupied by the pole column assembly in the first direction.

[0024] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, is described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a front view structural schematic diagram of the cover plate structure provided by the embodiment of the present application;

[0027] Figure 2 for Figure 1 A schematic diagram of a cross-sectional structure obtained by cutting the provided cover plate structure along the AA direction;

[0028] Figure 3 for Figure 1 Another schematic diagram of a cross-section structure obtained by cutting the cover plate structure along the AA direction provided;

[0029] Figure 4 A schematic diagram of the isometric structure of the lower plastic part provided in an embodiment of the present application;

[0030] Figure 5 Another isometric structural schematic diagram of the lower plastic part provided in the embodiment of the present application;

[0031] Figure 6 This is a schematic diagram of the cross-sectional structure of the lower plastic part provided in an embodiment of the present application obtained by cutting along the above-mentioned AA direction.

[0032] Reference numerals:

[0033] 11-cover body; 12-pole assembly; 121-connecting plate; 122-pole; 1221-through portion; 1222-pole bottom plate; 131-first surrounding wall; 132-second surrounding wall; 1321-outer wall; 1322-inner wall; 1323-connecting wall; 1324-chamfered portion; 133-top wall; 134-glue reduction groove; 135-nail hole; 14-liquid injection hole; 15-upper plastic part; 16-sealing ring; 2-pole group; 21-pole ear.

[0034] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0035] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0036] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0037] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0038] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0040] Next, refer to Figures 1 to 6 to describe the cover structure and the battery cell according to some embodiments of the present application.

[0041] See Figures 1 to 6 As shown, an embodiment of the first aspect of the present application provides a cover structure for a battery cell. Among them, the cover structure includes a cover body 11, a lower plastic part, and a pole column assembly 12. The lower plastic part includes a top wall 133, a first surrounding wall 131, and a second surrounding wall 132. The top wall 133 is arranged along one side of the cover body 11. The pole column assembly 12 penetrates through the top wall 133 and the cover body 11 along the first direction F1. Both the first surrounding wall 131 and the second surrounding wall 132 are arranged on the side of the top wall 133 facing away from the cover body 11, and the first surrounding wall 131 and the second surrounding wall 132 are respectively arranged along the edges on both sides of the top wall 133 in the second direction F2. A part of the pole column assembly 12 is arranged between the first surrounding wall 131 and the second surrounding wall 132, and the second direction F2 intersects with the first direction F1.

[0042] The following lists three different examples of the cover structure provided by the present application according to three different forms of the first surrounding wall 131 and the second surrounding wall 132.

[0043] Specifically, in Example 1 (not shown in the figure), in the first direction F1, the lengths of both the first surrounding wall 131 and the second surrounding wall 132 are greater than or equal to the distance between the pole group 2 of the battery cell and the pole column assembly 12.

[0044] Example 2, not shown in the figure, chamfered portions 1324 are provided on the sides of the end portions of both the first surrounding wall 131 and the second surrounding wall 132 facing the pole column assembly 12, which are opposite to the cover plate body 11 in the first direction F1.

[0045] Example 3, as Figures 2 to 5 shown, the length of one of the first surrounding wall 131 and the second surrounding wall 132 in the first direction F1 is greater than or equal to the distance between the pole group 2 and the pole column assembly 12, and a chamfered portion 1324 is provided on the side of one of the first surrounding wall 131 and the second surrounding wall 132 facing the pole column assembly 12, which is opposite to the cover plate body 11 in the first direction F1.

[0046] According to the cover plate structure provided by the above technical features, through the structures of the top wall 133 of the lower plastic part, the first surrounding wall 131 and the second surrounding wall 132, the part of the pole column assembly 12 that does not penetrate the cover plate body 11 can be effectively insulated from the cover plate body 11. On the one hand, the dimension of the first surrounding wall 131 and / or the second surrounding wall 132 in the first direction F1 is designed to be greater than or equal to the distance between the pole group 2 of the battery cell and the pole column assembly 12, so that this surrounding wall (the first surrounding wall 131 and / or the second surrounding wall 132) can extend to (or extend beyond) the position where the pole ear 21 is led out, thereby avoiding the contact between the pole ear 21 and the edge of this surrounding wall, and effectively avoiding the risk of the pole ear 21 being damaged by the surrounding wall; on the other hand, chamfered portions 1324 are provided on the sides of the end portions of the first surrounding wall 131 and / or the second surrounding wall 132, which are opposite to the cover plate body 11 in the first direction F1, and face the pole column assembly 12, to blunt the edges of this surrounding wall (the first surrounding wall 131 and / or the second surrounding wall 132), so that even if the pole ear 21 contacts this surrounding wall, it will not cause damage to the pole ear 21. Furthermore, it avoids the current method of making the pole column and the surrounding wall of the same length and using the operation of blocking the surrounding wall, so that the pole column assembly 12 can be thinned without being limited by the size of the surrounding wall, thereby effectively saving the material cost of the pole column assembly 12 and compressing the space occupied by the pole column assembly 12 in the first direction F1.

[0047] As Figures 1 to 6 shown, F1 shown in the figure can be an example of the above first direction F1, and F2 shown in the figure can be an example of the above second direction F2. As Figures 1 to 6 shown, an example of the battery cell being a square battery cell structure is shown. Correspondingly, the above first direction F1 can be parallel to the length direction of the battery cell, and the second direction F2 can be parallel to the thickness direction of the battery cell (i.e., the first direction F1 is perpendicular to the second direction F2). For the convenience of description, the width direction of the battery cell is defined as the third direction F3. F3 shown in the figure can be an example of the above third direction F3.

[0048] As Figures 2 to 5As shown in the figure, hereinafter, the length of the first surrounding wall 131 in the first direction F1 is greater than or equal to the distance between the pole group 2 and the pole column assembly 12. And a chamfer portion 1324 is provided on the side of the second surrounding wall 132 facing the pole column assembly 12 and opposite to the cover plate body 11 in the first direction F1 as an example to describe in detail the specific structure of the above cover plate structure.

[0049] Preferably, the pole group 2 includes a first end and a second end disposed opposite to each other in the second direction F2. The first surrounding wall 131 is disposed on the side where the first end is located, and the second surrounding wall 132 is disposed on the side where the second end is located. A pole tab 21 is led out from the end of the pole group 2 where the cover plate structure is located. The leading position of the pole tab 21 is close to the second end, and the pole tab 21 is bent from the leading position towards the first end so that the pole tab 21 fits against the end of the pole column assembly 12. In this way, on the one hand, the first surrounding wall 131 is disposed at the first end (that is, the first surrounding wall 131 is disposed at the end towards which the pole tab 21 is bent). When the pole tab 21 and the pole column assembly 12 are assembled, the pole tab 21 needs to extend out of the cover plate body 11 and can be arranged on the side where the first surrounding wall 131 is located according to the bending direction, so as to facilitate the welding operation between the pole tab 21 and the pole column assembly 12. And the first surrounding wall 131 can extend beyond the leading position of the pole tab 21, which enables the first surrounding wall 131 to effectively reduce the probability of the pole tab 21 contacting the housing of the battery cell during the assembly process, thereby avoiding the pole tab 21 leaking electricity through the housing during the assembly of the pole tab 21 and the pole column assembly 12. On the other hand, a chamfer portion 1324 is provided on the second surrounding wall 132, so that the size of the second surrounding wall 132 in the first direction F1 reaches the size of the first surrounding wall 131 in the first direction F1 (that is, in the first direction F1, the size of the first surrounding wall 131 is greater than the size of the second surrounding wall 132). This can not only save the material cost of the plastic part, but also compress the occupied space of the plastic part on the side where the second end is located to provide enough space for the bending of the pole tab 21.

[0050] Preferably, in the first direction F1, the difference between the size of the first surrounding wall 131 and the size of the second surrounding wall 132 can be greater than or equal to 2 mm, so as to ensure that there is enough exhaust space between the plastic part and the pole group 2.

[0051] Preferably, as Figure 2 and Figure 3 shown, the size of the above second surrounding wall 132 in the first direction F1 (that is Figure 3 the t1 shown in

[0052] can be 2.5 mm to 3.5 mm, so as to ensure that in the first direction F1, the second surrounding wall 132 can extend beyond the lower edge of the pole column assembly 12, thereby ensuring the insulation effectiveness of the second surrounding wall 132 for the pole group 2 assembly.

[0052] Preferably, as Figure 2 and Figure 3As shown, the dimension of the second surrounding wall 132 in the second direction F2 (i.e., Figure 3 the t2 shown in

[0053] can be 0.8 mm to 5 mm to ensure the strength of the second surrounding wall 132 and realize the limitation of the position of the pole column assembly 12 by the second surrounding wall 132 in the second direction F2. Figure 2 、 Figure 3 and Figure 5 shown, the above-mentioned lower plastic part may further include a glue-reducing groove 134, which may be arranged in the second surrounding wall 132 to further save the material cost of the lower plastic part and facilitate the manufacturing and forming of the lower plastic part.

[0054] Preferably, as Figure 5 shown, the above-mentioned glue-reducing groove 134 may be a straight groove extending in the third direction F3, and the glue-reducing groove 134 forms an opening on the top surface of the above-mentioned lower plastic part.

[0055] Preferably, as Figure 6 shown, the above-mentioned second surrounding wall 132 may include an outer side wall 1321, a connecting wall 1323 and an inner side wall 1322 connected in sequence, and the above-mentioned glue-reducing groove 134 may be formed by surrounding the outer side wall 1321, the connecting wall 1323 and the inner side wall 1322.

[0056] Among them, the above-mentioned inner side wall 1322 may be the side wall of the second surrounding wall 132 facing the pole column assembly 12, the outer side wall 1321 and the inner side wall 1322 face each other in the second direction F2, the connecting wall 1323 connects the inner side wall 1322 and the outer side wall 1321, and is arranged at one end of the second surrounding wall 132 facing away from the cover plate body 11 in the first direction F1.

[0057] It should be noted that the above-mentioned chamfered portion 1324 may be provided at the connection between the inner side wall 1322 and the connecting wall 1323.

[0058] Optionally, the above-mentioned chamfered portion 1324 may be a rounded corner connecting the outer surface of the inner side wall 1322 and the outer surface of the connecting wall 1323.

[0059] Preferably, when the dimension of the second surrounding wall 132 in the second direction F2 (i.e., Figure 3 the t2 shown in

[0060] is greater than or equal to 3 mm, the outer surface of the above-mentioned connecting wall 1323 further includes an inclined plane, and the inclined plane is connected to and tangent to the rounded chamfer to further ensure that the surface of the part of the second surrounding wall 132 that can contact the pole ear 21 is passivated and rounded. Figure 3When the t2) shown in the figure is between 0.8 mm and 3 mm, the above chamfered portion 1324 can be an inclined chamfer connecting the outer surface of the inner side wall 1322 and the outer surface of the connecting wall 1323, so as to facilitate the machining of the chamfered portion 1324.

[0061] Preferably, the wall thicknesses of the outer side wall 1321, the connecting wall 1323, and the inner side wall 1322 are the same, so as to facilitate the injection molding of the lower plastic part. It should be noted that as Figure 6 shown, the wall thicknesses of the outer side wall 1321 and the inner side wall 1322 can be understood as the dimensions of the outer side wall 1321 and the inner side wall 1322 in the second direction F2, and the wall thickness of the connecting wall 1323 can be understood as the dimension of the connecting wall 1323 in the first direction F1.

[0062] Furthermore, the wall thickness of the top wall 133 and the wall thickness of the first surrounding wall 131 can also be the same as the wall thicknesses of the outer side wall 1321, the connecting wall 1323, and the inner side wall 1322. In this way, the wall thickness consistency of the lower plastic part is further improved, and thus the injection molding of the lower plastic part is facilitated. Correspondingly, as Figure 6 shown, the wall thickness of the top wall 133 can be understood as the dimension of the top wall 133 in the first direction F1, and the wall thickness of the first surrounding wall 131 can be understood as the dimension of the first surrounding wall 131 in the second direction F2.

[0063] In the embodiment, preferably, as Figures 1 to 3 shown, the pole assembly 12 can include a connecting plate 121 and a pole 122 that can be riveted to each other. The connecting plate 121 is arranged on the other side of the cover plate body 11. The pole 122 includes a pole bottom plate 1222 fixedly connected to each other and a through portion 1221 extending along the first direction F1. The pole assembly 12 passes through the cover plate body 11 via the through portion 1221 and is riveted to the connecting plate 121. The pole bottom plate 1222 is arranged between the first surrounding wall 131 and the second surrounding wall 132.

[0064] Preferably, as Figures 4 to 6 shown, the top wall 133 is provided with a through hole 135 penetrating the top wall 133 along the first direction F1, and the through portion 1221 passes through the top wall 133 via the through hole 135.

[0065] Preferably, as Figure 2 and Figure 3 shown, taking the orientation shown in the figure as an example, when the pole assembly 12 is assembled on the cover plate body 11, the bottom surface of the pole bottom plate 1222 is located above the bottom surface of the shorter one of the first surrounding wall 131 and the second surrounding wall 132 in the first direction F1. In this way, the insulation effect of the lower plastic part on the pole assembly 2 is improved.

[0066] Preferably, the size of the pole post base plate 1222 in the first direction F1 (i.e., Figure 3 the t3 shown in) can be 1 mm to 2 mm. In other words, taking the size of the above-mentioned second enclosure wall 132 in the first direction F1 as 2.5 mm to 3.5 mm as an example, the distance between the bottom surface of the pole post base plate 1222 and the bottom surface of the second enclosure wall 132 in the first direction F1 can be 0.5 mm to 2.5 mm, so as to further ensure the insulation effect of the second enclosure wall 132 on the pole post assembly 12.

[0067] In the embodiment, optionally, as Figure 2 and Figure 3 shown, the above-mentioned cover plate structure may further include an upper plastic part 15, and at least part of the upper plastic part 15 is arranged between the connecting plate 121 and the cover plate body 11 for insulating the connecting plate 121 and the cover plate body 11 from each other.

[0068] Preferably, as Figure 2 and Figure 3 shown, the above-mentioned upper plastic part 15 may further include a retaining edge, and the retaining edge may be arranged around the outer edge of the upper plastic part 15 for one week, so that the retaining edge is fastened to the side wall of the above-mentioned connecting plate 121 for insulating the side wall of the connecting plate 121.

[0069] Preferably, as Figure 2 and Figure 3 shown, the above-mentioned cover plate structure may further include a sealing ring 16, and the sealing ring 16 may be sleeved on the outside of the above-mentioned through part 1221. One end of the sealing ring 16 in the first direction F1 is connected to the upper plastic part 15, and the other end of the sealing ring 16 in the first direction F1 is connected to the lower plastic part, thereby realizing the insulation between the through part 1221 and the cover plate body 11.

[0070] Optionally, as Figure 1 shown, the above-mentioned cover plate structure may further include a liquid injection hole 14 penetrating the cover plate body 11 along the first direction for injecting electrolyte into the inside of the battery cell.

[0071] The embodiment of the second aspect of the present application further provides a battery cell, including the cover plate structure described in any of the above embodiments. Therefore, it has all the beneficial technical effects of this cover plate structure and will not be elaborated here.

[0072] Preferably, not shown in the figure, the above-mentioned battery cell may further include a housing and the above-mentioned electrode group 2. The above-mentioned cover plate structure may cover one end of the housing in the first direction F1, and the above-mentioned electrode group 2 may be arranged in the closed space surrounded by the housing and the cover plate structure.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover plate structure, characterized in that, For a battery cell, the cover plate structure includes a cover plate body, a lower plastic part, and a pole column assembly. The lower plastic part includes a top wall, a first surrounding wall, and a second surrounding wall. The top wall is arranged along one side of the cover plate body. The pole column assembly penetrates through the top wall and the cover plate body along a first direction. The first surrounding wall and the second surrounding wall are both arranged on the side of the top wall facing away from the cover plate body, and the first surrounding wall and the second surrounding wall are respectively arranged along the edges on both sides of the top wall in a second direction. A part of the pole column assembly is arranged between the first surrounding wall and the second surrounding wall, and the second direction intersects with the first direction; In the first direction, the sizes of both the first surrounding wall and the second surrounding wall are greater than or equal to the distance between the pole group and the pole column assembly of the battery cell; Or, chamfered portions are arranged on the sides of the ends of the first surrounding wall and the second surrounding wall facing away from the cover plate body in the first direction and facing the side where the pole column assembly is located; Or, the length of one of the first surrounding wall and the second surrounding wall in the first direction is greater than or equal to the distance between the pole group and the pole column assembly, and a chamfered portion is arranged on the side of the one of the first surrounding wall and the second surrounding wall facing away from the cover plate body in the first direction and facing the side where the pole column assembly is located.

2. The cover plate structure according to claim 1, wherein The length of the first surrounding wall in the first direction is greater than or equal to the distance between the pole group and the pole column assembly; A chamfered portion is arranged on the side of the second surrounding wall facing away from the cover plate body in the first direction and facing the side where the pole column assembly is located.

3. The cover plate structure according to claim 2, wherein The pole group includes a first end and a second end arranged opposite to each other in the second direction. The first surrounding wall is arranged on the side where the first end is located, and the second surrounding wall is arranged on the side where the second end is located; A pole ear is led out at the end of the pole group where the cover plate structure is located. The leading-out position of the pole ear is close to the second end, and the pole ear bends from the leading-out position towards the first end so that the pole ear fits with the end of the pole column assembly.

4. The cover plate structure according to claim 2, wherein In the first direction, the size of the first surrounding wall is greater than the size of the second surrounding wall.

5. The cover plate structure according to claim 4, wherein In the first direction, the difference between the size of the first surrounding wall and the size of the second surrounding wall is greater than or equal to 2 mm.

6. The cover plate structure according to claim 2, characterized in that, The size of the second surrounding wall in the first direction is 2.5 mm to 3.5 mm; And / or, the size of the second surrounding wall in the second direction is 0.8 mm to 5 mm.

7. The cover plate structure according to claim 2, characterized in that The lower plastic part further includes a glue-reducing groove, and the glue-reducing groove is arranged inside the second surrounding wall.

8. The cover plate structure according to any one of claims 1 to 7, characterized in that, The pole column assembly includes a connecting plate and a pole column that can be riveted to each other. The connecting plate is arranged on the other side of the cover plate body. The pole column includes a pole column bottom plate and a penetrating portion extending along the first direction; The pole column assembly penetrates through the cover plate body via the penetrating portion and is riveted to the connecting plate, and the pole column bottom plate is arranged between the first surrounding wall and the second surrounding wall.

9. The cover plate structure according to claim 8, wherein, The size of the pole bottom plate in the first direction is 1 mm to 2 mm.

10. A battery cell, characterized in that, It includes the cover plate structure described in any one of claims 1 to 9.

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