Cover plate assembly and battery

Abstract

The utility model relates to battery technical field discloses a kind of cover plate assembly and battery, cover plate assembly includes: first insulating part, first insulating part includes bottom wall and at least one side wall, side wall is formed into along the direction perpendicular to the plane where bottom wall is, side wall is formed with at least one combination part;Glue layer, at least part of into combination part, or combination part into glue layer;Combination part is suitable for preventing glue layer from moving away from bottom wall in the direction perpendicular to the plane where bottom wall is.The cover plate assembly provided by the utility model makes glue layer and combination part form structural cooperation, stably fixes glue layer on cover plate assembly, that is, play the role of fixed welding slag, while can avoid the situation that protective glue after solidification can fall in severe cold area, guarantee the durability of glue layer, improve safety performance, reduce potential safety hazard.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cover plate assembly and a battery. Background Technology

[0002] In the battery manufacturing process, taking the short-blade lithium battery as an example, the tabs at both ends of the cell need to be welded to the base plates of the positive and negative electrode covers to ensure a stable electrical connection. In actual production, a high-efficiency and stable laser welding method is used to connect and assemble the tabs and the base plates.

[0003] However, laser welding uses laser energy to fuse the components together, a process that easily produces weld slag, which can then splatter into other parts of the cover plate.

[0004] To mitigate the impact of welding slag, one solution involves spraying a protective adhesive. After welding, this adhesive is evenly sprayed onto the inside of the cover plate, then allowed to flow and solidify quickly, binding the welding slag together to prevent sporadic slag from falling off and ensuring cell safety. However, in extremely cold environments, the cured protective adhesive may lose its stickiness. During vehicle operation, vibrations and impacts can easily cause the cured adhesive to detach, compromising its protective function and posing a safety hazard. Utility Model Content

[0005] In view of this, the present invention provides a cover plate assembly and a battery to solve the problem that the cured protective adhesive may fall off in extremely cold regions.

[0006] In a first aspect, this utility model provides a cover plate assembly, comprising:

[0007] The first insulating member includes a bottom wall and at least one side wall, the side wall extending along a direction perpendicular to the plane of the bottom wall, and the side wall having at least one joint.

[0008] The adhesive layer extends at least partially into the joint, or the joint extends into the adhesive layer; the joint is adapted to prevent the adhesive layer from moving away from the bottom wall in a direction perpendicular to the plane of the bottom wall.

[0009] Beneficial effects: The cover plate assembly provided by the embodiments of this utility model forms at least one joint on the side wall of the first insulating member, so that the adhesive layer can at least partially extend into the joint, or the joint extends into the adhesive layer. The joint is adapted to prevent the adhesive layer from moving away from the bottom wall in a direction perpendicular to the plane where the bottom wall is located. Thus, the adhesive layer and the joint form a structural fit, and the adhesive layer is stably fixed on the cover plate assembly, which plays the role of fixing welding slag. At the same time, it can prevent the cured protective adhesive from falling off in cold regions, ensuring the durability of the adhesive layer, improving safety performance, and reducing safety hazards.

[0010] In one alternative embodiment, the joint includes a groove formed by a partial recess in the sidewall.

[0011] Beneficial effects: After the protective adhesive is sprayed, as it flows, some of it fills the groove. After the adhesive cures, the adhesive layer in the groove forms a hook, which prevents the adhesive layer from moving away from the bottom wall in a direction perpendicular to the plane of the bottom wall, thus fixing the adhesive layer stably on the cover plate assembly.

[0012] In one alternative implementation, the ratio of the groove depth to the sidewall thickness ranges from 50% to 80%.

[0013] Beneficial effects: By setting an upper limit for the ratio of the groove depth to the sidewall thickness, the groove can be prevented from penetrating the sidewall and forming a non-penetrating groove. As a result, after the protective adhesive is sprayed, some of the protective adhesive can be filled into the groove as the adhesive flows, and the protective adhesive will not flow out through the groove to the outside of the first insulating component, thus avoiding waste of the protective adhesive.

[0014] By setting a lower limit for the ratio of the groove depth to the sidewall thickness, the size of the hanging ear formed by the adhesive layer in the groove can be guaranteed, thereby ensuring the force on the hanging ear, preventing the hanging ear from falling off, and achieving stable fixation of the adhesive layer on the cover plate assembly.

[0015] In one alternative implementation, the depth of the groove ranges from 0.6 mm to 0.96 mm.

[0016] In one alternative embodiment, the sidewall includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall arranged around the bottom wall.

[0017] Along the direction perpendicular to the plane of the bottom wall, the extension height of the fourth sidewall is less than the extension heights of the first, second, and third sidewalls.

[0018] Beneficial effects: By reducing the extension height of the fourth sidewall and allowing the tab to overlap with the welding surface of the electrode post base plate beyond the fourth sidewall, the welding allowance for the tab can be reduced, ensuring easier overlap and allowing for flat pressing during welding. This reduces the overall length of the tab and avoids material waste. Furthermore, by setting the extension heights of the first, second, and third sidewalls to be higher than that of the fourth sidewall, the height difference creates a groove that restricts the tab's placement, preventing overlap with other sidewalls during welding and thus avoiding the risk of contact between the tab and the outer shell after installation.

[0019] In one alternative embodiment, the joint is disposed on at least one of the first sidewall, the second sidewall, and the third sidewall.

[0020] In one alternative implementation, the cover plate assembly further includes a pole post;

[0021] The first insulating element also includes a pole receiving cavity formed by the bottom wall and the side wall, wherein the pole is at least partially disposed within the pole receiving cavity;

[0022] The adhesive layer is located on the side of the pole away from the bottom wall.

[0023] In one alternative embodiment, along a direction perpendicular to the plane of the bottom wall, the edge of the joint near the bottom wall is flush with the surface of the pole away from the bottom wall.

[0024] Beneficial effects: By making the edge of the joint close to the bottom wall flush with the surface of the pole away from the bottom wall, the adhesive leveling process can better bond with the joint, reducing the amount of protective adhesive used.

[0025] In one alternative embodiment, the cross-sectional shape of the groove includes rectangular, circular, triangular, or trapezoidal shapes.

[0026] Secondly, this utility model also provides a battery, comprising:

[0027] Battery cells, and cover plate assemblies as described above.

[0028] Since the battery includes a cover assembly, which has the same effect as the cover assembly, it will not be elaborated further here. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the first insulating component of this utility model;

[0031] Figure 2 This is a schematic diagram of the assembly state of the first insulating component and the pole post of this utility model;

[0032] Figure 3 This is an exploded view of the cover plate assembly of this utility model;

[0033] Figure 4 This is a schematic diagram showing the assembly state of the cover plate assembly and the battery cell of this utility model;

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Pole post; 11. Pole post base plate; 12. Riveting part; 2. Sealing ring; 3. First insulating component; 4. Cover plate body; 5. Second insulating component; 6. Riveting block;

[0036] 31. Joint; 32. Bottom wall; 33. Side wall; 331. First side wall; 332. Second side wall; 333. Third side wall; 334. Fourth side wall; 34. Pole post receiving cavity;

[0037] 100. Cover plate assembly; 200. Battery cell. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0042] In the battery manufacturing process, taking the short-blade lithium battery as an example, the tabs at both ends of the cell need to be welded to the base plates of the positive and negative electrode covers to ensure a stable electrical connection. In actual production, a high-efficiency and stable laser welding method is used to connect and assemble the tabs and the base plates.

[0043] However, laser welding uses laser energy to fuse the components together, a process that easily produces weld slag, which can then splatter into other parts of the cover plate.

[0044] To reduce the impact of welding slag, one solution in related technologies is to apply a layer of PI high-temperature tape to the laser-printed area to adhere the welding slag. However, the high-temperature tape cannot 100% cover all areas inside the cover plate where welding slag may splash, and the high-temperature tape will be in a long-term immersion environment in electrolyte inside the cell, which may cause it to lose adhesion and fall off, thus losing its original protective function.

[0045] Another solution is to use a spray adhesive method. After welding, the protective adhesive is evenly sprayed onto the inside of the cover plate, and then allowed to flow and solidify quickly, binding the weld slag together to prevent sporadic weld slag from falling off and ensuring cell safety. However, in extremely cold environments, the cured protective adhesive may lose its stickiness at low temperatures. During vehicle operation, vibrations and impacts can easily cause the cured adhesive to fall off, resulting in a loss of protection and posing a safety hazard. Therefore, after spraying protective adhesive inside the cover plate to fix the weld slag, how to further prevent the cured adhesive from falling off in extremely cold regions has become an urgent problem to be solved.

[0046] The cover plate assembly provided in the embodiments of this utility model can be firmly bonded to the adhesive layer, and even if the adhesive layer loses its adhesion in a low-temperature environment, the adhesive layer can still be stably fixed on the cover plate.

[0047] The following is combined Figures 1 to 4The following describes embodiments of the present invention.

[0048] According to an embodiment of the present invention, in one aspect, a cover plate assembly 100 is provided, comprising:

[0049] The first insulating member 3 includes a bottom wall 32 and at least one side wall 33. The side wall 33 extends along a direction perpendicular to the plane of the bottom wall 32 and has at least one joint 31.

[0050] The adhesive layer (not shown in the figure) extends at least partially into the joint 31, or the joint 31 extends into the adhesive layer; the joint 31 is adapted to prevent the adhesive layer from moving away from the bottom wall 32 in a direction perpendicular to the plane of the bottom wall 32.

[0051] In this embodiment, the cover plate assembly 100 needs to be welded to the tabs of the battery cell 200 to form a battery. Using laser welding to fuse the components together is a process that easily generates weld slag, which can splatter into other areas inside the cover plate assembly 100. The adhesive layer in this embodiment can solidify the weld slag into a single unit, reducing its impact.

[0052] It should be noted that the adhesive layer formation process in this embodiment can be carried out in the following manner:

[0053] After laser welding is completed between the cover plate assembly 100 and the electrode tabs of the battery cell 200, a protective adhesive of a certain thickness or quality is evenly sprayed onto the weld mark location using a spray nozzle. Then, a robotic arm is used to scrape and smooth the surface, or a compressed air nozzle is used for leveling. During this process, the protective adhesive has a certain fluidity and viscosity, and it slowly flows to the joint 31. After natural cooling at room temperature for 1-5 minutes, the protective adhesive gradually solidifies. This process solidifies weld slag and other foreign matter along with the adhesive. For ease of description, in this embodiment, the solidified protective adhesive is referred to as the adhesive layer. The adhesive layer forms a structural fit with the joint 31, preventing the adhesive layer from moving away from the bottom wall 32 in a direction perpendicular to the plane of the bottom wall 32, thereby stably fixing the adhesive layer onto the cover plate assembly 100.

[0054] In this embodiment, the adhesive layer refers to the cured protective adhesive.

[0055] The protective adhesive can be made of polyolefin (high molecular weight organic polymer), with a melting point of 150℃, and has certain viscosity, adhesion, insulation and resistance to electrolyte corrosion.

[0056] The cover plate assembly 100 provided in the embodiments of this utility model forms at least one joint 31 on the side wall 33 of the first insulating member 3, so that the adhesive layer can at least partially extend into the joint 31, or the joint 31 extends into the adhesive layer. The joint 31 is adapted to prevent the adhesive layer from moving away from the bottom wall 32 in a direction perpendicular to the plane where the bottom wall 32 is located. Thus, the adhesive layer and the joint 31 form a structural fit, and the adhesive layer is stably fixed on the cover plate assembly 100, which plays the role of fixing welding slag. At the same time, it can prevent the cured protective adhesive from falling off in cold regions, ensuring the durability of the adhesive layer, improving safety performance, and reducing safety hazards.

[0057] In some embodiments, the joint 31 includes a groove formed by a partial recess in the sidewall 33.

[0058] After the protective adhesive is sprayed, as the adhesive flows, some of it fills the groove. After the adhesive cures, the adhesive layer in the groove forms a hook, which prevents the adhesive layer from moving away from the bottom wall 32 in a direction perpendicular to the plane of the bottom wall 32, thereby fixing the adhesive layer stably on the cover plate assembly 100.

[0059] As a variation, the joint 31 can also be a protruding post, which extends from the side wall 33 toward the pole post receiving cavity 34.

[0060] After the protective adhesive is sprayed, it can wrap the protrusion as it flows. After the protective adhesive cures, the protrusion extends into the adhesive layer and prevents the adhesive layer from moving away from the bottom wall 32 in a direction perpendicular to the plane where the bottom wall 32 is located, thereby stably fixing the adhesive layer on the cover plate assembly 100.

[0061] In some embodiments, the ratio of the depth of the groove to the wall thickness of the sidewall 33 ranges from 50% to 80%.

[0062] By setting an upper limit for the ratio of the groove depth to the wall thickness of the sidewall 33, the groove can be prevented from penetrating the sidewall 33, forming a non-penetrating groove. Thus, after the protective adhesive is sprayed, as the protective adhesive flows, a portion of the protective adhesive can fill the groove, preventing it from flowing out of the groove to the outside of the first insulating member 3, thereby avoiding waste of the protective adhesive.

[0063] By setting a lower limit for the ratio of the groove depth to the wall thickness of the sidewall 33, the size of the hanging ear formed by the adhesive layer in the groove can be guaranteed, thereby ensuring the force on the hanging ear, preventing the hanging ear from falling off, and achieving stable fixation of the adhesive layer on the cover plate assembly 100.

[0064] For example, in this embodiment, the ratio of the depth of the groove to the wall thickness of the sidewall 33 can be 50%, 55%, 60%, 70%, 75%, or 80%, or it can be a range formed by any two of the above values.

[0065] In some embodiments, the depth of the groove ranges from 0.6 mm to 0.96 mm.

[0066] In this embodiment, the wall thickness of the sidewall 33 can be set to 1.2mm. In this case, the depth of the groove can be in the range of 0.6mm to 0.96mm.

[0067] For example, in this embodiment, the depth of the groove can be 0.6mm or 0.65mm or 0.7mm or 0.76mm or 0.8mm or 0.83mm or 0.9mm or 0.96mm, or it can be a range formed by any two of the above values.

[0068] In some embodiments, the cover plate assembly further includes a pole post 1;

[0069] The first insulating member 3 also includes a pole receiving cavity 34 formed by the bottom wall 32 and the side wall 33, and the pole 1 is at least partially disposed in the pole receiving cavity 34;

[0070] The adhesive layer is located on the side of the pole 1 away from the bottom wall 32.

[0071] Combination Figure 3 As shown, the cover plate assembly 100 of this embodiment includes a cover plate body 4. A first insulating member 3 and a second insulating member 5 are respectively disposed on both sides of the cover plate body 4. The pole post 1 includes a pole post base plate 11 and a riveting part 12. The pole post base plate 11 is disposed within the pole post receiving cavity 34. The riveting part 12 sequentially passes through the first insulating member 3, the cover plate body 4, and the second insulating member 5 and is fixedly connected to the riveting block 6. To facilitate the distinction between the two sides of the cover plate assembly 100, the side of the pole post base plate 11 facing away from the cover plate body 4 is defined as the welding surface, and the side of the riveting block 6 facing away from the cover plate body 4 is defined as the conductive surface.

[0072] After the cover plate assembly 100 is assembled, the pole post 1 needs to be welded to the tab of the cell 200. Specifically, the welding surface of the pole post base plate 11 is welded to the tab of the cell 200.

[0073] Combination Figure 4 The diagram shows the assembly state of the cover plate assembly 100 and the battery cell 200 after the tab welding is completed, wherein the tabs are led out from at least one end face of the battery cell 200. Figure 4As can be seen, the cover plate assembly 100 and the end face of the battery cell 200 with the tabs are in a close fit, with a narrow gap between them. During the welding stage, if the welding surface of the electrode base plate 11 is directly placed opposite the end face of the battery cell 200 with the tabs before welding, the welding operation will be difficult. To ensure smooth welding, the welding surface of the electrode base plate 11 and the end face of the battery cell 200 with the tabs should be placed at an obtuse angle or 180°. This facilitates the tabs being led out and overlapping with the welding surface of the electrode base plate 11, and also allows the laser welding equipment to irradiate the welding position to form a weld mark. After welding, protective adhesive is sprayed onto the weld mark using a spray nozzle to cure any weld slag or foreign matter. The tabs are then bent so that the welding surface of the electrode base plate 11 is aligned with and close to the end face of the battery cell 200 with the tabs, completing the assembly of the cover plate assembly 100 and the battery cell 200.

[0074] Additionally, the cover plate assembly 100 in this embodiment also includes a sealing ring 2, which is fitted over the outside of the riveting portion 12 to ensure insulation between the pole post 1 and the cover plate body 4.

[0075] In some embodiments, the sidewall 33 includes a first sidewall 331, a second sidewall 332, a third sidewall 333, and a fourth sidewall 334 disposed around the bottom wall 32.

[0076] Along the direction perpendicular to the plane where the bottom wall 32 is located, the extension height of the fourth side wall 334 is less than the extension height of the first side wall 331, the second side wall 332 and the third side wall 333.

[0077] To ensure smooth welding, the welding surface of the electrode base plate 11 should be placed at an obtuse angle or 180° to the end face of the battery cell 200 with the tab. The length of the tab from the battery cell 200 should not be too long to reduce material waste. When the tab is led out and overlapped with the welding surface of the electrode base plate 11, to ensure the overlap area between the tab and the welding surface of the electrode base plate 11, the extension height of the fourth side wall 334 can be reduced, allowing the tab to overlap with the welding surface of the electrode base plate 11 beyond the fourth side wall 334. This reduces the welding allowance of the tab, makes it easier to overlap the tab, and allows for flat pressing during welding, thereby reducing the overall length of the tab and avoiding material waste.

[0078] By setting the extension height of the first sidewall 331, the second sidewall 332, and the third sidewall 333 to be higher than the extension height of the fourth sidewall 334, the height difference creates a groove that restricts the placement of the electrode tab, preventing it from overlapping with other sidewalls 33 during welding. This avoids the risk of the electrode tab contacting the outer casing after assembly. Furthermore, a negative pressure adsorption step can be implemented before adhesive spraying to remove welding slag. The higher sidewall 33 allows for more concentrated adsorption, ensuring a better adsorption effect.

[0079] In some embodiments, the connecting portion 31 is disposed on at least one of the first sidewall 331, the second sidewall 332, and the third sidewall 333.

[0080] Since the extension height of the fourth sidewall 334 is relatively small, it is not convenient to set the joint 31. In this embodiment, the joint 31 is set on the first sidewall 331, the second sidewall 332 and the third sidewall 333.

[0081] The specific number of joints 31 provided on each sidewall 33 is not limited. For example, in this embodiment, the first sidewall 331 can be provided with 2 joints 31, the second sidewall 332 can be provided with 4 joints 31, and the third sidewall 333 can be provided with 2 joints 31.

[0082] In some embodiments, along a direction perpendicular to the plane of the bottom wall 32, the edge of the joint 31 near the bottom wall 32 is flush with the surface of the pole post 1 away from the bottom wall 32.

[0083] Taking the joint 31 as a groove as an example, by making the edge of the joint 31 close to the bottom wall 32 flush with the surface of the pole post 1 away from the bottom wall 32, the glue spraying process can better fill the groove and reduce the amount of protective glue used.

[0084] In some embodiments, the cross-sectional shape of the groove includes rectangle, circle, triangle or trapezoid, etc.

[0085] The opening area of ​​the joint 31 is not limited. For example, in this embodiment, a rectangular groove of 1.5mm*1.5mm can be used.

[0086] According to an embodiment of the present invention, in another aspect, a battery is also provided, comprising:

[0087] Battery cell 200, and cover plate assembly as described above.

[0088] The cover plate assembly 100 in this embodiment can be a negative electrode cover plate, a positive electrode cover plate, or a cover plate applied to the same side of the positive and negative electrodes.

[0089] The pole 1 can be made of pure copper or formed by friction welding of copper and aluminum.

[0090] The sealing ring 2 can be made of fluororubber.

[0091] The first insulating component 3 can be made of PP material.

[0092] The second insulating component 5 can be made of a composite of PPS and 40% glass fiber.

[0093] The cover plate body 4 can be made of aluminum alloy.

[0094] The material of the rivet block 6 can be aluminum.

[0095] The riveting part 12 of the pole post 1 is fixed to the riveting block 6 by riveting or welding.

[0096] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although 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 all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A cover plate assembly, characterized in that, include: The first insulating member (3) includes a bottom wall (32) and at least one side wall (33), the side wall (33) extending in a direction perpendicular to the plane of the bottom wall (32), and the side wall (33) having at least one joint (31); The adhesive layer extends at least partially into the joint (31), or the joint (31) extends into the adhesive layer; the joint (31) is adapted to prevent the adhesive layer from moving away from the bottom wall (32) in a direction perpendicular to the plane of the bottom wall (32).

2. The cover plate assembly according to claim 1, characterized in that, The joint (31) includes a groove formed by a partial recess in the sidewall (33).

3. The cover plate assembly according to claim 2, characterized in that, The ratio of the depth of the groove to the wall thickness of the sidewall (33) ranges from 50% to 80%.

4. The cover plate assembly according to claim 2, characterized in that, The depth of the groove ranges from 0.6 mm to 0.96 mm.

5. The cover plate assembly according to any one of claims 1 to 4, characterized in that, The sidewall (33) includes a first sidewall (331), a second sidewall (332), a third sidewall (333), and a fourth sidewall (334) arranged around the bottom wall (32); Along a direction perpendicular to the plane of the bottom wall (32), the extension height of the fourth side wall (334) is less than the extension height of the first side wall (331), the second side wall (332) and the third side wall (333).

6. The cover plate assembly according to claim 5, characterized in that, The joint (31) is disposed on at least one of the first sidewall (331), the second sidewall (332) and the third sidewall (333).

7. The cover plate assembly according to any one of claims 1 to 4, characterized in that, The cover plate assembly also includes a pole post (1); The first insulating member (3) further includes a pole receiving cavity (34) formed by the bottom wall (32) and the side wall (33), wherein the pole (1) is at least partially disposed in the pole receiving cavity (34); The adhesive layer is disposed on the side of the pole (1) away from the bottom wall (32).

8. The cover plate assembly according to claim 7, characterized in that, Along a direction perpendicular to the plane of the bottom wall (32), the edge of the joint (31) near the bottom wall (32) is flush with the surface of the pole post (1) away from the bottom wall (32).

9. The cover plate assembly according to claim 2, characterized in that, The cross-sectional shape of the groove includes rectangular, circular, triangular, or trapezoidal shapes.

10. A battery, characterized in that, include: The battery cell (200) and the cover assembly as described in any one of claims 1 to 9 above.

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