End plate structure and battery

Abstract

The utility model relates to the technical field of lithium batteries, and discloses an end plate structure and a battery. The second wall body and the first wall body are oppositely arranged in the first direction; a third wall body and a fourth wall body are arranged between the first wall body and the second wall body, the third wall body and the fourth wall body are suitable for jointly enclosing with the first wall body and the second wall body to form an accommodating space, and the accommodating space is suitable for accommodating a tab; the fifth wall body is arranged on one side, close to the pole group, of the first wall body along the third direction; one side, far away from the first wall body, of the fifth wall body and the second wall body are spaced in the first direction to form an avoiding hole, and the avoiding hole is suitable for avoiding the tab; and the fifth wall body is suitable for supporting and / or limiting the tab. According to the end plate structure provided by the utility model, the shape, the size and the position of the bent tab can be limited, so that the tab can be bent more normatively, meanwhile, short circuit caused by the fact that the tab is inversely inserted into a pole group due to bending extrusion is avoided, and the safety performance of a battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and particularly relates to an end plate structure and a battery. Background Art

[0002] Lithium-ion batteries are widely used in various fields such as transportation power sources, power energy storage sources, new energy storage power sources, aerospace and military industries due to their advantages of large capacity, high working voltage, strong charge retention ability, long cycle life, etc.

[0003] As the ear tab for leading out the current inside the battery cell, it is usually formed by bonding copper foil / aluminum foil together through ultrasonic welding. After ultrasonic welding, a layer of insulating protective tape is pasted on both sides of the ear tab, and then it is inserted into the end plate of the electrode group, and then welded to the electrode post bottom plate of the cover plate, so as to lead out the current inside the battery cell to the outside of the battery cell. With the continuous increase of the capacity of the battery cell, the number of layers of the ear tab foil increases, and the thickness of the ear tab increases accordingly. After the ear tab is welded to the electrode post base of the cover plate, the ear tab needs to be bent, and the cover plate is pressed into the housing to complete the laser welding and fixing of the cover plate and the housing. However, after the ear tab is bent, problems such as non-standard bending of the ear tab and short circuit caused by the ear tab being inverted into the electrode group often occur, seriously affecting the safety of the battery cell. Content of the Utility Model

[0004] In view of this, the utility model provides an end plate structure and a battery to solve the problems of non-standard bending of the ear tab and short circuit caused by the ear tab being inverted into the electrode group.

[0005] In the first aspect, the utility model provides an end plate structure, which is arranged between the electrode group and the cover plate. An ear tab extends out from one side of the electrode group facing the cover plate. The end plate structure includes:

[0006] A first wall body;

[0007] A second wall body, which is arranged opposite to the first wall body along a first direction;

[0008] A third wall body and a fourth wall body are arranged between the first wall body and the second wall body. The third wall body and the fourth wall body are adapted to jointly enclose a receiving space with the first wall body and the second wall body, and the receiving space is adapted to receive the ear tab;

[0009] A fifth wall body is arranged on one side of the first wall body close to the electrode group along a third direction; there is a clearance hole formed by a space between the side of the fifth wall body away from the first wall body and the second wall body along the first direction. The clearance hole is adapted to avoid the ear tab; the fifth wall body is adapted to support and / or limit the ear tab.

[0010] Beneficial effects: For the end plate structure provided by the present utility model, when the tab is bent, the fifth wall body supports and / or positions the tab, thereby limiting the shape, size, and position of the tab after bending, making the tab bending more regular. At the same time, it avoids the short-circuit problem caused by the tab being severely inverted and inserted into the electrode group due to being bent and squeezed, improving the safety performance of the battery.

[0011] In an alternative embodiment, the thickness of the fifth wall body is L, and L satisfies 0.8 mm ≤ L ≤ 1.5 mm.

[0012] Beneficial effects: On the one hand, it is convenient to engrave product information on the fifth wall body, ensuring sufficient support strength of the fifth wall body, so that the fifth wall body effectively supports and / or positions the tab. On the other hand, it can ensure sufficient accommodation space for the tab in the end plate structure, preventing the tab from squeezing the first wall body and / or the second wall body and avoiding deformation of the first wall body and / or the second wall body.

[0013] In an alternative embodiment, the width of the fifth wall body in the first direction is T, and T satisfies 45%×W ≤ T ≤ 65%×W, where W is the width of the accommodation space in the first direction.

[0014] Beneficial effects: On the one hand, it ensures a sufficient support surface for the tab on the fifth wall body, so that the fifth wall body effectively supports the tab to effectively limit the shape, size, and position of the tab after bending. On the other hand, it can ensure that the tab can pass through the avoidance hole smoothly during assembly, avoiding affecting the assembly efficiency and assembly yield.

[0015] In an alternative embodiment, the fifth wall body is arranged at an angle with the first wall body; the included angle between the fifth wall body and the first wall body is α, and α satisfies 70° ≤ α ≤ 85°.

[0016] Beneficial effects: On the one hand, it can ensure sufficient accommodation space for the end plate structure, effectively protecting the tab, and at the same time enabling the fifth wall body to effectively support the tab. On the other hand, it can make the tab bend into a preset ideal "S" shape, reducing the space occupied by the tab in the third direction, which is beneficial to improving the energy density of the battery cell.

[0017] In an alternative embodiment, one side of the fifth wall body in the second direction is fixedly connected to the third wall body, and the other side is fixedly connected to the fourth wall body.

[0018] Beneficial effects: Thus, the fifth wall body is stressed together with the first wall body, the third wall body, and the fourth wall body, which is beneficial to improving the support strength of the fifth wall body and avoiding deformation of the fifth wall body when the tab is bent.

[0019] In an alternative embodiment, the thickness of the first wall body is M, and M satisfies 0.8 mm ≤ M ≤ 1.2 mm.

[0020] Beneficial effects: It can not only prevent the end plate structure from being squeezed and deformed, prevent the misalignment between the end plate structure and the insulating part, thereby avoiding the ear tab from being extruded from the gap between the end plate structure and the insulating part, avoiding the ear tab from overlapping the housing, reducing the risk of short circuit of the battery cell, but also ensure sufficient bending space for the ear tab, avoid severe extrusion of the ear tab, and prevent the end plate structure from being deformed by the extrusion of the ear tab.

[0021] In an alternative embodiment, the thickness of the second wall is N, where N satisfies 1.0 mm ≤ N ≤ 1.5 mm.

[0022] Beneficial effects: It can not only prevent the end plate structure from being squeezed and deformed, prevent the misalignment between the end plate structure and the insulating part, thereby avoiding the ear tab from being extruded from the gap between the end plate structure and the insulating part, avoiding the ear tab from overlapping the housing, reducing the risk of short circuit of the battery cell, but also ensure sufficient bending space for the ear tab, avoid severe extrusion of the ear tab, and prevent the end plate structure from being deformed by the extrusion of the ear tab.

[0023] In an alternative embodiment, a reinforcing rib is provided on one side of the second wall facing the first wall along the first direction, the reinforcing rib is arranged along the second direction, and the reinforcing rib is adapted to bear force together with the second wall.

[0024] Beneficial effects: Thereby further enhancing the structural strength of the second wall, preventing the end plate structure from being squeezed and deformed due to insufficient strength of the second wall, preventing the misalignment between the end plate structure and the insulating part, thereby avoiding the ear tab from being extruded from the gap between the end plate structure and the insulating part, avoiding the ear tab from overlapping the housing, and reducing the risk of short circuit of the battery cell.

[0025] In an alternative embodiment, the reinforcing rib is formed by the second wall protruding towards the first wall along the first direction, and one side of the reinforcing rib away from the second wall along the first direction is adapted to limit the ear tab.

[0026] Beneficial effects: When the ear tab is bent, the fifth wall supports and / or limits the ear tab, and at the same time the reinforcing rib limits the ear tab, so as to jointly define the shape, size and position of the ear tab after bending, thereby not only preventing the end plate structure from being deformed by the extrusion of the ear tab, but also ensuring that the ear tab is bent into a preset ideal "S" shape, making the bending of the ear tab more regular.

[0027] In a second aspect, the present invention further provides a battery, including: a pole group, a cover plate, and the end plate structure as described above;

[0028] A pole post bottom plate is provided on one side of the cover plate facing the pole group; an ear tab extends from one side of the pole group facing the cover plate, and the ear tab is adapted to pass through the avoidance hole and be welded to the pole post bottom plate.

[0029] Beneficial effects: For the battery provided by the present utility model, by arranging the above-mentioned end plate structure between the electrode group and the cover plate, when the tab is bent, the fifth wall body supports and / or positions the tab, thereby defining the shape, size and position of the tab after bending, making the bending of the tab more regular. At the same time, it avoids the short-circuit problem caused by the tab being severely inserted into the electrode group due to being bent and squeezed, improving the safety performance of the battery. Description of the Drawings

[0030] In order to more clearly illustrate the specific embodiments of the present utility model 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 utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a cross-sectional view of a battery along the third direction according to an embodiment of the present utility model;

[0032] Figure 2 It is a first three-dimensional view of an end plate structure according to an embodiment of the present utility model;

[0033] Figure 3 It is a top view of an end plate structure according to an embodiment of the present utility model;

[0034] Figure 4 is Figure 3 a cross-sectional view of the A-A section in

[0035] Figure 5 It is a second three-dimensional view of an end plate structure according to an embodiment of the present utility model;

[0036] Figure 6 is Figure 5 a cross-sectional view of the B-B section in

[0037] Description of the Reference Numerals:

[0038] 10. End plate structure; 101. Accommodating space; 102. Avoidance hole; 11. First wall body; 12. Second wall body; 13. Third wall body; 14. Fourth wall body; 15. Fifth wall body; 16. Reinforcing rib;

[0039] 20. Electrode group; 21. Tab;

[0040] 30. Cover plate; 31. Electrode post base plate; 32. Insulating member; 33. Plate body;

[0041] 40. Insulating sheet;

[0042] 50. Housing. Detailed Embodiments

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0044] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 6 , to describe the embodiments of the present utility model.

[0045] According to an embodiment of the present utility model, on the one hand, a terminal plate structure 10 is provided. The terminal plate structure 10 is disposed between the electrode group 20 and the cover plate 30. An electrode tab 21 extends from a side of the electrode group 20 facing the cover plate 30. The terminal plate structure 10 is used to fix and protect the electrode tab 21. The terminal plate structure 10 includes:

[0046] A first wall body 11;

[0047] A second wall body 12, which is disposed opposite to the first wall body 11 along a first direction;

[0048] A third wall body 13 and a fourth wall body 14 are disposed between the first wall body 11 and the second wall body 12. The third wall body 13 and the fourth wall body 14 are adapted to jointly enclose a receiving space 101 with the first wall body 11 and the second wall body 12. The receiving space 101 is adapted to receive the electrode tab 21;

[0049] A fifth wall body 15 is disposed on a side of the first wall body 11 close to the electrode group 20 along a third direction; a side of the fifth wall body 15 away from the first wall body 11 is spaced apart from the second wall body 12 along the first direction to form an avoidance hole 102. The avoidance hole 102 is adapted to avoid the electrode tab 21; the fifth wall body 15 is adapted to support and / or limit the electrode tab 21.

[0050] During the manufacturing process, the electrode tab 21 is led out from a side of the electrode group 20 facing the cover plate 30. During assembly, the electrode tab 21 passes through the avoidance hole 102 and is then welded to the electrode post bottom plate 31 on the cover plate 30, thereby leading the current inside the battery cell to the outside of the battery cell; after the electrode tab 21 is welded to the electrode post bottom plate 31 on the cover plate 30, the electrode tab 21 needs to be bent. As shown in Figure 1 , the shape of the electrode tab 21 after bending is an "S" shape, and then the cover plate 30 is pressed into the housing 50, and the cover plate 30 is welded and fixed to the housing 50.

[0051] Please refer to Figure 1As shown, when the tab 21 is bent, the fifth wall body 15 supports and / or positions the tab 21, thereby defining the shape, size, and position of the tab 21 after bending, making the bending of the tab 21 more regular. At the same time, it avoids the short - circuit problem caused by the tab 21 being severely inverted and inserted into the electrode group 20 due to being bent and squeezed, improving the safety performance of the battery.

[0052] Furthermore, the end - plate structure 10 is made of an insulating material.

[0053] Furthermore, the first wall body 11, the second wall body 12, the third wall body 13, the fourth wall body 14, and the fifth wall body 15 are of an integrally - formed structure.

[0054] In some embodiments, please refer to Figure 4 As shown, the thickness of the fifth wall body 15 is L, and L satisfies 0.8mm ≤ L ≤ 1.5mm.

[0055] It should be noted that during the manufacturing process, product information such as the cell product number, production date, and / or specification model is usually engraved on the fifth wall body 15 for product traceability. Therefore, the fifth wall body 15 cannot be too thin, otherwise it is not only easy to cause the mold to be unable to be prepared and unable to engrave product information on the fifth wall body 15, but also easy to cause insufficient support strength of the fifth wall body 15, and the fifth wall body 15 is easily squeezed and deformed during assembly, resulting in the fifth wall body 15 being unable to effectively support and / or position the tab 21. Therefore, the thickness L of the fifth wall body 15 needs to satisfy L ≥ 0.8mm; at the same time, the fifth wall body 15 cannot be too thick, otherwise it is easy to cause insufficient accommodation space for the tab 21, and even cause the tab 21 to squeeze the first wall body 11 and / or the second wall body 12, causing deformation of the first wall body 11 and / or the second wall body 12. Therefore, the thickness L of the fifth wall body 15 also needs to satisfy L ≤ 1.5mm.

[0056] In this embodiment, by making the thickness L of the fifth wall body 15 satisfy 0.8mm ≤ L ≤ 1.5mm, on the one hand, it is convenient to engrave product information on the fifth wall body 15, ensuring sufficient support strength of the fifth wall body 15, so that the fifth wall body 15 effectively supports and / or positions the tab 21; on the other hand, it can ensure sufficient accommodation space for the tab 21 by the end - plate structure 10, prevent the tab 21 from squeezing the first wall body 11 and / or the second wall body 12, and avoid deformation of the first wall body 11 and / or the second wall body 12.

[0057] In some embodiments, please refer to Figure 4 As shown, the width of the fifth wall body 15 in the first direction is T, and T satisfies 45%×W ≤ T ≤ 65%×W, where W is the width of the accommodation space 101 in the first direction.

[0058] It should be noted that Figure 4The medium dimension line "T" shows the width of the fifth wall body 15 in the first direction. The width of the fifth wall body 15 in the first direction cannot be too small, otherwise it is easy to cause insufficient support surface of the fifth wall body 15 for the tab 21, unable to effectively support the tab 21, and unable to effectively define the shape, size and position of the tab 21 after bending. Therefore, the width T of the fifth wall body 15 in the first direction needs to satisfy T≥45%×W, where W is the width of the accommodation space 101 in the first direction; the width of the fifth wall body 15 in the first direction cannot be too large, otherwise it is easy to cause the avoidance hole 102 to be too narrow, resulting in the tab 21 being unable to pass through the avoidance hole 102 smoothly during assembly, affecting the assembly efficiency and the assembly yield. Therefore, the width T of the fifth wall body 15 in the first direction also needs to satisfy T≤65%×W.

[0059] In this embodiment, the width T of the fifth wall body 15 in the first direction satisfies 45%×W≤T≤65%×W, where W is the width of the accommodation space 101 in the first direction. On the one hand, it ensures that the fifth wall body 15 has sufficient support surface for the tab 21, so that the fifth wall body 15 can effectively support the tab 21 to effectively define the shape, size and position of the tab 21 after bending. On the other hand, it can ensure that the tab 21 can pass through the avoidance hole 102 smoothly during assembly, avoiding affecting the assembly efficiency and the assembly yield.

[0060] In some embodiments, please refer to Figure 4 As shown, the fifth wall body 15 is arranged at an angle with the first wall body 11; the included angle between the fifth wall body 15 and the first wall body 11 is α, and α satisfies 70°≤α≤85°.

[0061] It should be noted that the included angle α between the fifth wall body 15 and the first wall body 11 cannot be too small, otherwise it is not only easy to cause insufficient accommodation space 101 of the end plate structure 10, unable to effectively protect the tab 21, but also easy to cause the fifth wall body 15 to be unable to effectively support the tab 21. Therefore, α needs to satisfy α≥70°; the included angle α between the fifth wall body 15 and the first wall body 11 cannot be too large, otherwise it is impossible to make the tab 21 bend into a preset ideal "S" shape, easy to increase the space occupation of the tab 21 in the third direction, affecting the energy density of the battery cell. Therefore, α also needs to satisfy α≤85°.

[0062] In this embodiment, the included angle α between the fifth wall body 15 and the first wall body 11 satisfies 70°≤α≤85°. On the one hand, it can ensure sufficient accommodation space 101 of the end plate structure 10 to effectively protect the tab 21, and at the same time make the fifth wall body 15 effectively support the tab 21. On the other hand, it can make the tab 21 bend into a preset ideal "S" shape, reducing the space occupation of the tab 21 in the third direction, which is beneficial to improving the energy density of the battery cell.

[0063] In some embodiments, please also combineFigure 3 As shown, one side of the fifth wall body 15 along the second direction is fixedly connected to the third wall body 13, and the other side is fixedly connected to the fourth wall body 14, so that the fifth wall body 15 is stressed together with the first wall body 11, the third wall body 13 and the fourth wall body 14, which is beneficial to improving the support strength of the fifth wall body 15 and avoiding deformation of the fifth wall body 15 when the tab 21 is bent.

[0064] Furthermore, one side of the fifth wall body 15 along the second direction is integrally formed with the third wall body 13, and the other side is integrally formed with the fourth wall body 14.

[0065] In some embodiments, please refer to Figure 4 As shown, the thickness of the first wall body 11 is M, and M satisfies 0.8mm ≤ M ≤ 1.2mm.

[0066] It should be noted that, please refer to Figure 1 As shown, the cover plate 30 includes an insulating member 32 and a plate body 33. The plate body 33 is suitable for welding with the housing 50. The insulating member 32 is arranged between the plate body 33 and the end plate structure 10. The insulating member 32 is suitable for insulating protection of the tab 21 to prevent the tab 21 from overlapping with the plate body 33 and / or the housing 50 and prevent short circuit. If the wall thickness of the first wall body 11 is insufficient, after the tab 21 is pressed into the end plate structure 10, the end plate structure 10 is easily squeezed and deformed due to the insufficient strength of the first wall body 11, resulting in misalignment between the end plate structure 10 and the insulating member 32. At this time, the tab 21 is easily extruded from the gap between the end plate structure 10 and the insulating member 32 and overlaps with the housing 50, posing a risk of short circuit of the battery cell. Therefore, the thickness M of the first wall body 11 needs to satisfy M ≥ 0.8mm; if the wall thickness of the first wall body 11 is too thick, it will instead affect the bending space of the tab 21 and also cause the tab 21 to be severely squeezed, resulting in deformation of the end plate structure 10. Therefore, the thickness M of the first wall body 11 also needs to satisfy M ≤ 1.2mm.

[0067] In this embodiment, by making the thickness M of the first wall body 11 satisfy 0.8mm ≤ M ≤ 1.2mm, not only can the extrusion deformation of the end plate structure 10 be avoided, the misalignment between the end plate structure 10 and the insulating member 32 be prevented, thereby avoiding the tab 21 from being extruded from the gap between the end plate structure 10 and the insulating member 32 and avoiding the tab 21 from overlapping with the housing 50, reducing the risk of short circuit of the battery cell, but also sufficient bending space for the tab 21 can be ensured, avoiding severe extrusion of the tab 21 and preventing the end plate structure 10 from being deformed by the extrusion of the tab 21.

[0068] In some embodiments, please refer to Figure 4 As shown, the thickness of the second wall body 12 is N, and N satisfies 1.0mm ≤ N ≤ 1.5mm.

[0069] It should be noted that since the first wall body 11 is directly connected to the fifth wall body 15 and is arranged at an angle, the first wall body 11 and the fifth wall body 15 can bear force together, which enhances the structural strength of the first wall body 11. The second wall body 12 is arranged at an interval from the fifth wall body 15. Therefore, the wall thickness of the second wall body 12 is greater than that of the first wall body 11 to ensure the structural strength of the second wall body 12. If the wall thickness of the second wall body 12 is insufficient, after the tab 21 is pressed into the end plate structure 10, the end plate structure 10 is easily squeezed and deformed due to the insufficient strength of the second wall body 12, resulting in the misalignment of the end plate structure 10 and the insulating part 32. At this time, the tab 21 is easily extruded from the gap between the end plate structure 10 and the insulating part 32 and overlaps the housing 50, posing a risk of short circuit of the battery cell. Therefore, the thickness N of the second wall body 12 needs to satisfy N≥1.0 mm; if the second wall body 12 is too thick, it will also affect the bending space of the tab 21, causing the tab 21 to be severely squeezed and resulting in the deformation of the end plate structure 10. Therefore, the thickness N of the second wall body 12 also needs to satisfy N≤1.5 mm.

[0070] In this embodiment, by satisfying 1.0 mm≤N≤1.5 mm for the thickness N of the second wall body 12, not only can the extrusion deformation of the end plate structure 10 be avoided, the misalignment of the end plate structure 10 and the insulating part 32 be prevented, thereby avoiding the extrusion of the tab 21 from the gap between the end plate structure 10 and the insulating part 32, avoiding the overlap of the tab 21 and the housing 50, and reducing the risk of short circuit of the battery cell, but also sufficient bending space for the tab 21 can be ensured, avoiding severe extrusion of the tab 21, and preventing the end plate structure 10 from being deformed by the extrusion of the tab 21.

[0071] In some embodiments, please refer to Figure 1 As shown, a reinforcing rib 16 is provided on one side of the second wall body 12 facing the first wall body 11 along the first direction. The reinforcing rib 16 is arranged along the second direction and is adapted to bear force together with the second wall body 12.

[0072] In this embodiment, by providing the reinforcing rib 16 on the second wall body 12, the structural strength of the second wall body 12 is further enhanced, the extrusion deformation of the end plate structure 10 due to the insufficient strength of the second wall body 12 is avoided, the misalignment of the end plate structure 10 and the insulating part 32 is prevented, thereby avoiding the extrusion of the tab 21 from the gap between the end plate structure 10 and the insulating part 32, avoiding the overlap of the tab 21 and the housing 50, and reducing the risk of short circuit of the battery cell.

[0073] In some embodiments, please refer to Figure 1 As shown, the reinforcing rib 16 protrudes from the second wall body 12 along the first direction towards the direction close to the first wall body 11, and one side of the reinforcing rib 16 away from the second wall body 12 along the first direction is adapted to limit the tab 21.

[0074] When the tab 21 is bent, the fifth wall 15 supports and / or positions the tab 21, and at the same time, the rib 16 positions the tab 21 to jointly define the shape, size, and position of the tab 21 after bending. Thus, it can not only prevent the end plate structure 10 from being deformed by the extrusion of the tab 21, but also ensure that the tab 21 is bent into a preset ideal "S" shape, making the bending of the tab 21 more regular.

[0075] According to an embodiment of the present invention, on the other hand, a battery is also provided. Please refer to Figure 1 As shown, the battery includes: a pole group 20, a cover plate 30, and the end plate structure 10 as described above;

[0076] A pole post base plate 31 is provided on the side of the cover plate 30 facing the pole group 20; the tab 21 extends from the side of the pole group 20 facing the cover plate 30, and the tab 21 is adapted to pass through the avoidance hole 102 and be welded to the pole post base plate 31.

[0077] For the battery provided by the present invention, by arranging the above-mentioned end plate structure 10 between the pole group 20 and the cover plate 30, when the tab 21 is bent, the fifth wall 15 supports and / or positions the tab 21, so as to define the shape, size, and position of the tab 21 after bending, making the bending of the tab 21 more regular. At the same time, it avoids the problem of short circuit caused by the tab 21 being severely inserted into the pole group 20 due to being bent and squeezed, improving the safety performance of the battery.

[0078] Furthermore, the battery further includes an insulating sheet 40, and the insulating sheet 40 covers the outer peripheral wall of the pole group 20, and the insulating sheet 40 is heat-sealed and welded to the end plate structure 10.

[0079] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An end plate structure, arranged between a pole group and a cover plate, wherein the pole group extends a pole ear toward one side of the cover plate, characterized in that: The end plate structure includes: a first wall; A second wall body, arranged opposite to the first wall body along a first direction; A third wall body and a fourth wall body are arranged between the first wall body and the second wall body, and the third wall body and the fourth wall body are suitable for enclosing together with the first wall body and the second wall body to form a receiving space, and the receiving space is suitable for receiving the tab; The fifth wall body is arranged on a side of the first wall body close to the pole group along the third direction; the side of the fifth wall body away from the first wall body is spaced from the second wall body along the first direction to form an avoidance hole, and the avoidance hole is suitable for avoiding the pole ear; the fifth wall body is suitable for supporting and / or limiting the pole ear.

2. The end plate structure according to claim 1, characterized in that: The thickness of the fifth wall is L, and L satisfies 0.8 mm ≤ L ≤ 1.5 mm.

3. The end plate structure according to claim 1, characterized in that: The width of the fifth wall along the first direction is T, and T satisfies 45%×W≤T≤65%×W, wherein W is the width of the accommodating space along the first direction.

4. The end plate structure according to claim 1, characterized in that: The fifth wall is arranged at an angle to the first wall; the angle between the fifth wall and the first wall is α, and α satisfies 70°≤α≤85°.

5. The end plate structure according to claim 1, characterized in that: One side of the fifth wall along the second direction is fixedly connected to the third wall, and the other side of the fifth wall is fixedly connected to the fourth wall.

6. The end plate structure according to claim 1, characterized in that: The thickness of the first wall is M, and M satisfies 0.8 mm ≤ M ≤ 1.2 mm.

7. The end plate structure according to claim 1, characterized in that: The thickness of the second wall is N, and N satisfies 1.0 mm≤N≤1.5 mm.

8. The end plate structure according to any one of claims 1 to 7, characterized in that: A reinforcing rib is provided on a side of the second wall body along the first direction facing the first wall body. The reinforcing rib is provided along the second direction and is suitable for bearing force together with the second wall body.

9. The end plate structure according to claim 8, characterized in that: The reinforcing rib is formed by the second wall body protruding along the first direction toward the first wall body, and the side of the reinforcing rib away from the second wall body along the first direction is suitable for limiting the pole ear.

10. A battery, characterized in that: include: A pole group and a cover plate, and an end plate structure as claimed in any one of claims 1 to 9; A pole bottom plate is arranged on one side of the cover plate facing the pole group; the pole ear extends from one side of the pole group facing the cover plate, and the pole ear is suitable for passing through the avoidance hole and being welded to the pole bottom plate.

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