Battery cover plate and battery

Abstract

The application provides a battery cover plate structure, which belongs to the technical field of batteries and specifically relates to a battery cover plate, which comprises a pole column, a concave part provided on the side of the pole column facing a pole group, support parts provided on the opposite inner side walls of the concave part in a first direction and protruding from the inner side walls, a connecting sheet, the connecting sheet partially or entirely covering the opening of the concave part, the connecting sheet being overlapped on the support parts at both ends in the first direction and being butt welded with the opening edges of the concave part, and a lug accommodating cavity formed between the concave part and the connecting sheet, the connecting sheet being provided with at least one lug overlapping edge, and the lug of the pole group being capable of bypassing the lug overlapping edge from the side of the connecting sheet facing the pole group and extending into the lug accommodating cavity. The battery cover plate is characterized in that the support parts are arranged in the concave part of the pole column, and the connecting sheet is butt welded with the edges of the concave part, so that the connection strength of the pole column and the connecting sheet and the stability of the lug accommodating cavity are ensured. The application further provides a battery comprising the battery cover plate.

Description

Technical Field

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

[0002] The existing battery's tabs are connected to the bottom of the terminal's connecting piece, which easily causes the tabs to be squeezed, bumped, deformed, and damaged. The tabs are not rationally arranged inside the battery, occupying too much internal space and wasting the battery's overall energy density. In addition, the connection between the terminal and the connecting piece is not stable and is easy to fall off. Utility Model Content

[0003] In view of this, this application provides a battery cover and a battery, which ensures the connection strength between the terminal post and the connecting piece and the stability of the electrode ear receiving cavity by providing a support part in the recess of the terminal post and welding the connecting piece to the edge of the recess.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A battery cover, comprising:

[0006] The pole post has a recess on the side facing the pole group, and the recess has a support portion protruding from the inner side wall on the opposite inner side wall in the first direction.

[0007] A connecting piece, wherein the connecting piece partially or completely covers the opening of the recess, the two ends of the connecting piece in a first direction overlap the support portion and are welded to the edge of the opening of the recess, and an electrode receiving cavity is formed between the recess and the connecting piece;

[0008] The connecting piece is provided with at least one tab overlap edge, and the tab of the electrode group can be bypassed from the side of the connecting piece toward the electrode group and extended into the tab receiving cavity.

[0009] Optionally, the tab overlap edge extends along the first direction.

[0010] Optionally, the connecting piece has a second direction perpendicular to the first direction, and there is a gap between the edge of the connecting piece in the second direction and the opening edge of the recess, and the edge of the connecting piece in the second direction forms the tab overlap edge.

[0011] Optionally, the connecting piece has a strip-shaped hole extending along the first direction, and the edge of the strip-shaped hole in the second direction forms the tab overlap edge;

[0012] The dimension of the strip-shaped hole in the second direction is S1, and the thickness of the electrode tab is D. The relationship between S1 and D satisfies: 5 ≤ D / S1 ≤ 60; and / or,

[0013] The distance from one end of the strip hole in the first direction to one edge of the connecting piece is B, where 1mm ≤ B ≤ 5mm, and / or,

[0014] The distance C between the other end of the strip hole in the first direction and the other edge of the connecting piece is 1mm≤C≤5mm.

[0015] Optionally, the connecting piece has a second direction perpendicular to the first direction. The connecting piece includes a first connecting piece and a second connecting piece. The two ends of the first connecting piece overlap the support portion in the first direction and are welded to the opening edge of the recess. The two ends of the second connecting piece overlap the support portion in the first direction and are welded to the opening edge of the recess. There is a gap between the first connecting piece and the second connecting piece in the second direction. The first connecting piece forms the tab overlap edge at the edge of the first connecting piece in the second direction, and the second connecting piece forms the tab overlap edge at the edge of the second direction.

[0016] Optionally, the gap between the first connecting sub-piece and the second connecting sub-piece in the second direction is S4, and the relationship between S4 and D satisfies: 2≤D / S4≤60.

[0017] Optionally, the distance between the free ends of adjacent electrodes extending into the electrode receiving cavity in the second direction is C, where C ≥ 0.5 mm.

[0018] Optionally, the connecting piece has a second direction perpendicular to the first direction, the length direction of the support portion is parallel to the second direction, the support portion extends along the second direction on the inner sidewall of the recess, the weld penetration depth of the connecting piece and the pole post is A, the thickness of the connecting piece is T, and the relationship between A and T satisfies: 0.3mm ≤ A ≤ T, and / or,

[0019] The inner wall has a dimension L in the second direction, and the support portion has a length L1 in the second direction. The relationship between L and L1 satisfies: 20% ≤ L1 / L ≤ 1, and / or,

[0020] The width W of the support part satisfies: 0.3mm≤W3≤3mm.

[0021] Optionally, the connecting piece has a second direction perpendicular to the first direction, the support portion is spaced apart along the second direction on the inner sidewall, the weld penetration depth of the connecting piece and the pole is A, the thickness of the connecting piece is T, and the relationship between A and T satisfies: 0.3mm ≤ A ≤ 0.85T, and / or,

[0022] The length of the inner sidewall in the second direction is L, and the total length of the supporting portion in the second direction is L5, where L5 ≥ 1 mm, and / or,

[0023] The area of ​​each support portion projected perpendicular to the opening direction of the recess is M, where M ≥ 0.5 mm. 2 , and / or

[0024] The dimension W of the support in the first direction satisfies: 0.3mm≤W3≤3mm.

[0025] This application also provides a battery, including the battery cover, and further comprising:

[0026] A housing that can form a cell receiving cavity with the battery cover;

[0027] The electrode assembly is disposed within the cell receiving cavity, and the electrode tabs of the electrode assembly can extend from the side of the connecting piece toward the electrode assembly, bypassing the electrode tab overlap edge and into the electrode tab receiving cavity.

[0028] The battery cover of this application has a tab receiving cavity formed by the recess of the pole post and the connecting piece, which can accommodate the tab and prevent the tab from being squeezed, collided, deformed and damaged. By setting a support part in the recess of the pole post and welding the connecting piece to the edge of the recess, the connection strength between the pole post and the connecting piece and the stability of the tab receiving cavity are guaranteed.

[0029] The battery of this application allows the free end of the tab to be inserted into the tab receiving cavity, preventing the tab from being squeezed, collided, deformed, or damaged. It also saves internal space of the battery and improves the overall energy density of the battery. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the battery cover of this application;

[0032] Figure 2This is a top view of the battery of this application;

[0033] Figure 3 for Figure 2 Cross-sectional view at point AA;

[0034] Figure 4 for Figure 3 Enlarged view of the area within the Chinese border;

[0035] Figure 5 for Figure 3 Cross-sectional view at point BB;

[0036] Figure 6 for Figure 5 Enlarged view of the area within the Chinese border;

[0037] Figure 7 for Figure 6 Enlarged view of the area circled in the middle;

[0038] Figure 8 This is a schematic diagram of one embodiment of the support portion of this application;

[0039] Figure 9 for Figure 8 Enlarged view of the central pole;

[0040] Figure 10 A schematic diagram of another embodiment of the support portion of this application;

[0041] Figure 11 for Figure 10 Enlarged view of the central pole;

[0042] Figure 12 This is a schematic diagram of another embodiment of the connecting piece of this application;

[0043] Figure 13 for Figure 12 Dimensioning diagram of the connecting piece;

[0044] Figure 14 for Figure 13 Cross-sectional view at point AA;

[0045] Figure 15 for Figure 12 A schematic diagram showing the connection piece and the electrode tabs of the quadrupole assembly after assembly.

[0046] Figure 16 for Figure 15 Side view;

[0047] Figure 17 This is a schematic diagram of another embodiment of the connecting piece of this application;

[0048] Figure 18 for Figure 17 Side view.

[0049] exist Figures 1-18 middle:

[0050] 1. Pole post; 11. Recess; 12. Support; 13. Pole lug receiving cavity; 14. Inner side wall; 141. First chamfer; 2. Connecting piece; 21. Strip hole; 22. First connecting piece; 23. Second connecting piece; 24. Pole lug overlapping edge; 241. Second chamfer; 3. Cover plate body; 4. Pole assembly; 5. Pole lug. Detailed Implementation

[0051] This application provides a battery cover and a battery. By providing a support portion in the recess of the terminal post and welding the connecting piece to the edge of the recess, the connection strength between the terminal post and the connecting piece and the stability of the electrode ear receiving cavity are ensured.

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] like Figures 1-4 As shown, the battery cover provided in this application includes:

[0054] The cover plate body 3 has a through hole for mounting the pole post 1.

[0055] The pole post 1 is fitted into a through hole in the cover plate body 3. The side of the pole post 1 facing the pole assembly 4 has a recess 11. Support portions 12 protruding from the inner sidewalls 14 of the recess 11 are respectively provided on opposite inner sidewalls 14 in a first direction; wherein the first direction is... Figure 2 The X direction in;

[0056] The connecting piece 2 can be rectangular or waist-shaped, etc. The connecting piece 2 partially or completely covers the opening of the recess 11. Specifically, the two ends of the connecting piece 2 in the first direction overlap the support part 12 and are welded to the edge of the opening of the recess 11. The shape of the two ends of the opening of the recess 11 in the first direction matches the shape of the two ends of the connecting piece 2 in the first direction. An electrode receiving cavity 13 is formed between the recess 11 and the connecting piece 2.

[0057] Preferably, the sides of the connecting piece 2 at both ends in the first direction are in contact with the inner sidewalls 14 of the opening of the recess 11 at both ends in the first direction, and the side of the connecting piece 2 facing the pole group 4 is flush with the opening of the recess 11 to facilitate butt welding.

[0058] The connecting piece 2 is provided with at least one tab overlap edge 24, and the tab 5 of the pole group 4 can bypass the tab overlap edge 24 from the side of the connecting piece 2 toward the pole group 4 and extend into the tab receiving cavity 13.

[0059] The battery cover of this application has a recess 11 formed on the side of the terminal post 1 facing the terminal group 4. The tab receiving cavity 13 formed by the recess 11 and the connecting piece 2 can accommodate the tab 5. According to the number of terminal groups 4 and the number of tabs 5, a corresponding number of tab overlapping edges 24 are set on the connecting piece 2 so that each tab 5 extends into the tab receiving cavity 13 through the tab overlapping edge 24, avoiding the tab 5 being squeezed, collided and deformed and damaged. The side of the connecting piece 2 away from the terminal group 4 abuts against the support part 12 provided in the recess 11. The side of the connecting piece 2 close to the terminal group 4 is welded to the edge of the recess 11, thereby ensuring the connection strength between the terminal post 1 and the connecting piece 2 and the stability of the tab receiving cavity 13.

[0060] In a preferred embodiment, the tab overlap edge 24 extends along a first direction.

[0061] Since the connecting piece 2 overlaps the support portion 12 at both ends in the first direction and is welded to the opening edge of the recess 11, if the electrode tab overlap edge 24 extends along the first direction, the direction of the electrode tab overlap edge 24 and the welded part of the connecting piece 2 are less likely to interfere with each other. Preferably, the connecting piece 2 has a second direction perpendicular to the first direction, and the two ends of the connecting piece 2 in the second direction can be separated from the opening edge of the recess 11, so that the electrode tab 5 can pass through the gap into the electrode tab receiving cavity 13. At the same time, the electrode tab 5 can also overlap the two ends of the connecting piece 2 in the second direction. In this case, the connecting piece 2 has two electrode tab overlap edges 24. Alternatively, one or more strip-shaped slots extending along the first direction are opened on the connecting piece 2, so that the electrode tab 5 passes through the strip-shaped slot into the electrode tab receiving cavity 13 and overlaps the strip-shaped slot on the edge of the strip-shaped slot in the second direction. Each strip-shaped slot can form two electrode tab overlap edges 24.

[0062] Of course, it can also be set according to the actual situation so that the electrode overlap edge 24 extends along the second direction. In this case, the electrode overlap edge 24 cannot be formed at both ends of the connecting piece 2 in the first direction, so it is necessary to open a strip-shaped slot hole extending along the second direction on the connecting piece 2.

[0063] In a preferred embodiment, such as Figures 1-4 As shown, the connecting piece 2 has a second direction that is perpendicular to the first direction, i.e. Figure 2 In the Y direction, the same applies below. There is a gap between the edge of the connecting piece 2 in the second direction and the opening edge of the recess 11, and the edge of the connecting piece 2 in the second direction forms an overlapping edge 24 of the tab.

[0064] In this embodiment, the two ends of the connecting piece 2 overlap the support portion 12 in the first direction, and the two ends of the connecting piece 2 in the second direction are respectively provided with gaps between the edges of the opening of the recess 11, thereby forming two electrode overlap edges 24 for the electrode tabs 5 to overlap. This embodiment is applicable to the case where there are two electrode groups 4 in the battery; of course, it is also possible to only provide a gap between the edge of one end of the connecting piece 2 in the second direction and the edge of the opening of the recess 11, and the edge of the other end of the connecting piece 2 in the second direction is in contact with the edge of the opening of the recess 11.

[0065] like Figures 5-7 As shown, a first chamfer 141 is provided at the edge of the opening of the inner sidewall 14 of the pole post 1 to prevent scratching the pole tab 5; a second chamfer 241 is provided at the upper and lower edges of the pole tab overlapping edge 24 to prevent scratching the pole tab 5.

[0066] In a preferred embodiment, such as Figures 12-16 As shown, the connecting piece 2 has a strip hole 21 extending in the first direction, and the edge of the strip hole 21 in the second direction forms an electrode overlap edge 24. Thus, the connecting piece 2 has four electrode overlap edges 24, which is suitable for the case where a four-electrode group 4 is set inside the battery. Of course, multiple parallel strip holes 21 can also be opened according to the actual number of electrode groups 4 and electrode tabs 5.

[0067] The width of the strip hole 21, i.e., its dimension in the second direction, is S1, and the thickness of the tab 5 is D. The relationship between S1 and D satisfies: 5 ≤ D / S1 ≤ 60; and / or,

[0068] The distance from one end of the strip hole 21 to the edge of one end of the connecting piece 2 in the first direction is B, where 1mm ≤ B ≤ 5mm, and / or,

[0069] The distance C between the other end of the strip hole 21 in the first direction and the other edge of the connecting piece 2 is 1mm≤C≤5mm.

[0070] The width of the strip hole 21 needs to be sufficient to allow the two tabs 5 to pass through without interference, while also not too large to avoid damaging the strength of the connecting piece 2 itself. Therefore, the ratio of D / S1 should be set between 5 and 15.

[0071] The distance B from one end of the strip hole 21 to one edge of the connecting piece 2 in the first direction and the distance C from the other end of the strip hole 21 to the other edge of the connecting piece 2 in the first direction are important. If B and C are too small, it will easily affect the strength of the connecting piece 2. If B and C are too large, the length of the strip hole 21 cannot be guaranteed, which will easily affect the process of perforating the electrode tab 5, causing assembly difficulties and deformation of the electrode tab 5. Therefore, it is advisable to set the size range of B and C between 1mm and 5mm.

[0072] In a preferred embodiment, such asFigure 17 and Figure 18 As shown, the connecting piece 2 is configured as two completely separate parts, including a first connecting piece 22 and a second connecting piece 23. The two ends of the first connecting piece 2 in the first direction overlap with the support part 12 and are welded to the opening edge of the recess 11. The two ends of the second connecting piece 2 in the first direction overlap with the support part 12 and are welded to the opening edge of the recess 11. There is a gap between the first connecting piece 22 and the second connecting piece 23 in the second direction. The edge of the first connecting piece 22 in the second direction forms an electrode tab overlapping edge 24, and the edge of the second connecting piece 23 in the second direction forms an electrode tab overlapping edge 24. Similar to the strip hole 21 on the connecting piece 2, the connecting piece 2 has four electrode tab overlapping edges 24, which is suitable for the case where a four-electrode group 4 is set inside the battery.

[0073] The split connecting piece 2 is easy to process and there is no need to consider the distance between the two ends of the strip hole 21 and the edges of the connecting piece 2 in the first direction; however, during welding, it is necessary to maintain the spacing between the two connecting pieces so that the tab 5 can pass through the gap without interference.

[0074] Of course, the connecting piece 2 can also be composed of three or more connecting pieces, depending on the number of pole groups 4 and pole tabs 5.

[0075] In a preferred embodiment, such as Figure 1 As shown, the gap between the first connecting sub-piece 22 and the second connecting sub-piece 23 in the second direction is S4, and the relationship between S4 and D satisfies: 2≤D / S4≤60.

[0076] The gap between the first connecting piece 22 and the second connecting piece 23 in the second direction needs to be such that the two tabs 5 can pass through without interference, and at the same time, it needs to be not too large so as not to affect the energy density of the battery. Therefore, the D / S4 ratio should be set between 2 and 10.

[0077] In a preferred embodiment, such as Figure 5 and Figure 6 As shown, the distance between the free ends of adjacent electrodes 5 extending into the electrode receiving cavity 13 in the second direction is C. In order to avoid interference between the free ends of electrodes 5, C ≥ 0.5 mm.

[0078] Similarly, such as Figures 12-16 As shown, in the embodiment where a strip hole 21 is provided on the connecting piece 2, the distance between the free ends of adjacent tabs 5 extending into the tab receiving cavity 13 in the second direction is C. In order to avoid interference between the free ends of the tabs 5, C≥0.5mm.

[0079] like Figures 17-18As shown, in an embodiment where the connecting piece 2 includes a first connecting piece 2 and a second connecting piece 2, the distance between the free ends of adjacent electrodes 5 extending into the electrode receiving cavity 13 in the second direction is C. To avoid interference between the free ends of the electrodes 5, C ≥ 0.5 mm.

[0080] In a preferred embodiment, such as Figure 8 and Figure 9 As shown, the connecting piece 2 has a second direction perpendicular to the first direction, and the length direction of the support portion 12 is parallel to the second direction. The support portion 12 extends along the second direction on the inner sidewall 14 of the recess 11, that is, a strip-shaped support portion 12 is respectively provided on the inner sidewall 14 opposite to the recess 11. The weld penetration depth between the connecting piece 2 and the pole post 1 is A, and the thickness of the connecting piece 2 is T. The relationship between A and T satisfies: 0.3mm≤A≤T, and / or

[0081] The inner wall 14 has a dimension L in the second direction, and the support 12 has a length L1 in the second direction. The relationship between L and L1 satisfies: 20% ≤ L1 / L ≤ 1, and / or,

[0082] The width W of the support part 12 satisfies: 0.3mm≤W3≤3mm.

[0083] The weld penetration depth A should not be too small, and it needs to meet the welding strength between the connecting piece 2 and the pole 1. Therefore, the value of A should be set between 0.3 mm and T.

[0084] The length L1 of the support part 12 in the second direction should not be too small, otherwise the support for the connecting piece 2 will be unstable and it will be easy to overturn during the welding process. Therefore, the ratio of L1 / L should be set between 20% and 1.

[0085] If the width of the support part 12 is too small, the support of the connecting piece 2 will be unstable. If the width of the support part 12 is too large, it will increase the weight of the pole post 1 and cause the energy density of the battery to decrease. Therefore, the width W3 of the support part 12 should be set between 0.3mm and 3mm.

[0086] In a preferred embodiment, such as Figure 10 and Figure 11 As shown, the connecting piece 2 has a second direction perpendicular to the first direction, and the support portion 12 is spaced along the second direction on the inner sidewall 14, that is, the support portion 12 is discontinuous. Compared with the continuous strip-shaped support portion 12, this discontinuous support portion 12 can reduce the weight of the pole post 1. In this embodiment, the weld penetration depth between the connecting piece 2 and the pole post 1 is A, and the thickness of the connecting piece 2 is T. The relationship between A and T satisfies: 0.3mm≤A≤0.85T, and / or,

[0087] The inner wall 14 has a length L in the second direction, and the total length of the support portion 12 in the second direction is L5, where L5 ≥ 1 mm, and / or,

[0088] The area of ​​the projection of each support portion 12 in the direction perpendicular to the opening of the recess 11 is M, where M ≥ 0.5 mm², and / or,

[0089] The width of the support portion 12, that is, the dimension W of the support portion 12 in the first direction, satisfies: 0.3mm≤W3≤3mm.

[0090] The weld penetration depth A should not be too small, as it needs to meet the welding strength requirements between the connecting piece 2 and the pole post 1. The weld penetration depth A should not be too large, as it is easy to melt through the connecting piece 2 and even melt to the break-point support part 12, which will affect the support part 12. After a limited number of support parts 12 are destroyed, the support strength will be affected. Therefore, the value of A should be set between 0.3mm and 0.85T.

[0091] The total length of the support part 12 in the second direction is L5 = L2 + L3 + L4. L5 cannot be too small, otherwise the support for the connecting piece 2 will be unstable. The value of L5 must be greater than 1mm.

[0092] To ensure the stability of the support, the area M of each support part 12 needs to be greater than or equal to 0.5 mm2;

[0093] If the width of the support part 12 is too small, the support of the connecting piece 2 will be unstable. If the width of the support part 12 is too large, it will increase the weight of the pole post 1 and cause the energy density of the battery to decrease. Therefore, the width W3 of the support part 12 should be set between 0.3mm and 3mm.

[0094] This application also provides a battery, such as Figures 1-6 As shown, including the battery cover, it also includes:

[0095] The housing, together with the battery cover, forms a cavity for housing the battery cells;

[0096] The electrode group 4 is disposed in the cell receiving cavity, and the electrode tab 5 of the electrode group 4 can bypass the electrode tab overlapping edge 24 from the side of the connecting piece 2 toward the electrode group 4 and extend into the electrode tab receiving cavity 13.

[0097] The battery of this application allows the free end of the tab 5 to be inserted into the tab receiving cavity 13, preventing the tab 5 from being squeezed, collided, deformed, or damaged, saving internal space of the battery, and improving the overall energy density of the battery.

[0098] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0099] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the word “or” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0100] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled or recombined. These disassemblies or recombinations should be considered as equivalent solutions of this application.

[0101] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0102] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0103] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery cover, characterized in that, include: The pole post has a recess on the side facing the pole group, and the recess has a support portion protruding from the inner side wall on the opposite inner side wall in the first direction. A connecting piece, wherein the connecting piece partially or completely covers the opening of the recess, the two ends of the connecting piece in a first direction overlap the support portion and are welded to the edge of the opening of the recess, and an electrode receiving cavity is formed between the recess and the connecting piece; The connecting piece is provided with at least one tab overlap edge, and the tab of the electrode group can be bypassed from the side of the connecting piece toward the electrode group and extended into the tab receiving cavity.

2. The battery cover according to claim 1, characterized in that, The overlap edge of the electrode extends along the first direction.

3. The battery cover according to claim 2, characterized in that, The connecting piece has a second direction perpendicular to the first direction, and there is a gap between the edge of the connecting piece in the second direction and the opening edge of the recess. The connecting piece forms the tab overlap edge at the edge of the second direction.

4. The battery cover according to claim 3, characterized in that, The connecting piece has a strip-shaped hole extending along the first direction, and the edge of the strip-shaped hole in the second direction forms the tab overlap edge; The dimension of the strip-shaped hole in the second direction is S1, and the thickness of the electrode tab is D. The relationship between S1 and D satisfies: 5 ≤ D / S1 ≤ 60; and / or, The distance from one end of the strip hole in the first direction to one edge of the connecting piece is B, where 1mm ≤ B ≤ 5mm, and / or, The distance C between the other end of the strip hole in the first direction and the other edge of the connecting piece is 1mm≤C≤5mm.

5. The battery cover according to claim 2, characterized in that, The connecting piece has a second direction perpendicular to the first direction. The connecting piece includes a first connecting piece and a second connecting piece. The two ends of the first connecting piece in the first direction overlap the support portion and are welded to the opening edge of the recess. The two ends of the second connecting piece in the first direction overlap the support portion and are welded to the opening edge of the recess. There is a gap between the first connecting piece and the second connecting piece in the second direction. The first connecting piece forms the tab overlap edge at the edge of the second direction, and the second connecting piece forms the tab overlap edge at the edge of the second direction.

6. The battery cover according to claim 5, characterized in that, The gap between the first connecting sub-piece and the second connecting sub-piece in the second direction is S4, and the relationship between S4 and D satisfies: 2≤D / S4≤60.

7. The battery cover according to any one of claims 3-6, characterized in that, The distance between the free ends of adjacent electrodes extending into the electrode receiving cavity in the second direction is C, where C ≥ 0.5 mm.

8. The battery cover according to claim 1, characterized in that, The connecting piece has a second direction perpendicular to the first direction, the length direction of the support portion is parallel to the second direction, the support portion extends along the second direction on the inner sidewall of the recess, the weld penetration depth of the connecting piece and the pole post is A, the thickness of the connecting piece is T, and the relationship between A and T satisfies: 0.3mm ≤ A ≤ T, and / or, The length of the inner sidewall in the second direction is L, and the length of the support portion in the second direction is L1. The relationship between L and L1 satisfies: 20% ≤ L1 / L ≤ 1, and / or, The width W of the support part satisfies: 0.3mm≤W3≤3mm.

9. The battery cover according to claim 1, characterized in that, The connecting piece has a second direction perpendicular to the first direction, and the support portion is spaced apart along the second direction on the inner sidewall. The weld penetration depth between the connecting piece and the pole post is A, and the thickness of the connecting piece is T. The relationship between A and T satisfies: 0.3mm ≤ A ≤ 0.85T, and / or... The inner sidewall has a dimension L in the second direction, and the total length of the supporting portion in the second direction is L5, where L5 ≥ 1 mm, and / or, The projected area of ​​each support portion in the direction perpendicular to the opening of the recess is M, where M ≥ 0.5 mm. 2 , and / or The dimension W of the support in the first direction satisfies: 0.3mm≤W3≤3mm.

10. A battery, characterized in that, Including the battery cover as described in any one of claims 1-9, further comprising: A housing that can form a cell receiving cavity with the battery cover; The electrode assembly is disposed within the cell receiving cavity, and the electrode tabs of the electrode assembly can extend from the side of the connecting piece toward the electrode assembly, bypassing the electrode tab overlap edge and into the electrode tab receiving cavity.

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