Top cover assembly and battery

Abstract

The utility model provides a top cover assembly and a battery. The top cover assembly comprises a top cover and a conductive column, a through hole is formed in the top cover, penetrates through the top cover and is used for extending out of an electrode lug of the roll core. The top cover comprises a first positioning piece which surrounds the through opening and is spaced from the through opening. The conductive column is connected to the top cover and arranged around the through opening. The conductive column is provided with an accommodating chamber which is used for accommodating the electrode lug. The conductive column comprises a first end facing the top cover, the first end is provided with a second positioning piece, and the first positioning piece is in positioning connection with the second positioning piece. The top cover is provided with the first positioning piece which surrounds the through hole and is spaced from the through hole, and the first end of the conductive column is provided with the second positioning piece, so that alignment between the conductive column and the top cover can be realized through positioning connection between the first positioning piece and the second positioning piece; therefore, the alignment difficulty between the conductive column and the top cover can be reduced, the assembly tolerance between the conductive column and the top cover can be controlled within a reasonable range, and the consistency of the battery can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a top cap subassembly and battery. BACKGROUND

[0002] Battery is used for storing and releasing energy, and is a device capable of converting electrical energy into chemical energy or converting chemical energy into electrical energy. The battery includes a roll core, positive and negative poles, and a shell. The roll core is arranged in the shell, the positive and negative poles are arranged at one end of the shell or at two ends of the shell respectively, the positive and negative pole tabs of the roll core are electrically connected with the positive and negative poles respectively, and the positive and negative poles are used for delivering the electrical energy of the roll core to an electrical equipment or delivering the electrical energy of a power supply equipment (such as a power grid) to the roll core. The connection mode between the pole and the shell is welding and pressure connection, and welding is the most common. In the battery with the welding connection mode, the pole is usually made of metal, such as copper, nickel, aluminum, etc. The metal part of the pole and the shell is connected together through a welding process to ensure good conduction of current and stable mechanical connection. In the pre-operation of welding the pole and the shell, the pole and the shell are aligned and positioned to ensure that the pole and the shell are within the assembly tolerance range, so as to improve the consistency of the battery assembly. In the related art, it is not easy to control the alignment and positioning due to the difficulty in controlling the alignment and positioning, which not only consumes a lot of time, but also causes the problem of poor performance consistency of the battery in the battery pack due to deviation from the tolerance, which is not conducive to the long-term stable operation of the battery pack. It can be seen that the accurate control and quality management of this link are very important. SUMMARY

[0003] The embodiment of the utility model provides a kind of top cap subassembly and battery, can improve the technical problem of not easy to control in related art when the pole and the shell are welded.

[0004] In the first aspect, the embodiment of the utility model provides a kind of top cap subassembly, applied to battery, comprising:

[0005] Top cover is provided with through hole, the through hole passes through the top cover, and the electrode ear of roll core is used to extend;The top cover includes the first positioning structure that surrounds the through hole and is arranged with the through hole interval;

[0006] Conductive column is connected to the top cover and is arranged around the through hole;The conductive column is provided with receiving chamber, and the receiving chamber is used to accommodate the electrode ear;

[0007] The conductive column includes the first end towards the top cover, and the first end is provided with the second positioning structure, and the first positioning structure and the second positioning structure are positioned and connected.

[0008] In an embodiment, the first positioning structure includes positioning groove, and the second positioning structure includes positioning flange, or the first positioning structure includes positioning flange, and the second positioning structure includes positioning groove,

[0009] The positioning flange is fitted in the positioning groove.

[0010] In an embodiment, the first positioning structure comprises a first positioning step, and the second positioning structure comprises a second positioning step.

[0011] The first positioning step is fitted with the second positioning step.

[0012] In an embodiment, the top cover comprises a first surface in the thickness direction, the top cover is further provided with a groove, an opening of the groove is located at the first surface, the through opening is provided through the bottom of the groove, and the first positioning step is formed between the bottom of the groove and the first surface.

[0013] In an embodiment, the first positioning step comprises a first step surface, a second step surface and a third step surface,

[0014] In the thickness direction of the top cover, the second step surface is spaced between the first surface and the bottom of the groove, the first step surface is bent and connected between the first surface and the second step surface, and the third step surface is bent and connected between the second step surface and the bottom of the groove.

[0015] The second positioning step comprises a fourth step surface, a fifth step surface and a sixth step surface, the fourth step surface and the sixth step surface are spaced, the fifth step surface is bent and connected between the fourth step surface and the sixth step surface, the fourth step surface abuts against the second step surface, the sixth step surface abuts against the bottom of the groove, and the fifth step surface is oppositely arranged with the third step surface.

[0016] In an embodiment, the top cover further comprises a positioning edge located at the area of the bottom of the groove, and the thickness of the positioning edge is between 20% and 30% of the thickness of the top cover.

[0017] In a second aspect, the application provides a battery, comprising:

[0018] A shell, the shell comprises two ends arranged oppositely, and the shell is provided with a cavity;

[0019] A roll core, the roll core is accommodated in the cavity of the shell, and the roll core is provided with an electrode lug; and

[0020] A top cover assembly, the top cover assembly is the top cover assembly described in any embodiment of the application, the top cover assembly is connected to one end of the shell, the electrode lug is arranged through the through opening of the top cover assembly and is accommodated in the accommodation cavity of the top cover assembly.

[0021] In an embodiment, the conductive column comprises a limiting frame and an end plate, the limiting frame surrounds the accommodation chamber, the limiting frame comprises a first end and a second end opposite to the first end, the electrode lug extends into the accommodation chamber from the first end, the electrode lug is electrically connected to an inner wall of a side of the limiting frame facing the accommodation chamber, and the end plate is connected to the second end.

[0022] In an embodiment, the second end comprises a seventh step surface, an eighth step surface and a ninth step surface, the seventh step surface is arranged close to the accommodation chamber and is spaced apart from the ninth step surface, and the eighth step surface is connected between the seventh step surface and the ninth step surface in a bent manner.

[0023] In a thickness direction of the end plate, the end plate comprises two opposite side surfaces and an end wall connected between the two side surfaces, one of the side surfaces abuts against the seventh step surface, and the end wall is arranged opposite to the eighth step surface.

[0024] In an embodiment, the battery further comprises a busbar, the busbar is accommodated in the accommodation chamber, the busbar comprises a fitting surface, the fitting surface is a curved surface, and the electrode lug is attached to the fitting surface.

[0025] In an embodiment, the shell and the top cover of the top cover assembly are integrally connected.

[0026] The embodiment of the utility model has the advantages of:

[0027] The first positioning structure is arranged around the through opening and is spaced apart from the through opening, the second positioning structure is arranged at the first end of the conductive column, and thus the alignment and positioning between the conductive column and the top cover can be realized through the positioning connection of the first positioning structure and the second positioning structure before the conductive column is connected with the top cover, the difficulty of alignment and positioning between the conductive column and the top cover is reduced, the assembly tolerance between the conductive column and the top cover can be controlled within a reasonable range, and the consistency of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the premise of not paying creative labor.

[0029] Figure 1 is a structural schematic view of a battery provided by the embodiment of the utility model;

[0030] Figure 2is an explosion schematic view of the top cover assembly provided by an embodiment of the utility model;

[0031] Figure 3 is a cross section schematic view of the top cover assembly provided by an embodiment of the utility model;

[0032] Figure 4 is Figure 3 is an enlarged schematic view of A part in the middle;

[0033] Figure 5 is a structure schematic view of the first positioning structure and the second positioning structure provided by another embodiment of the utility model;

[0034] Figure 6 is a structure schematic view of the first positioning structure and the second positioning structure provided by still another embodiment of the utility model;

[0035] Figure 7 is an explosion schematic view of the battery provided by an embodiment of the utility model;

[0036] Figure 8 is a cross section schematic view of the battery provided by an embodiment of the utility model;

[0037] Figure 9 is Figure 3 is an enlarged schematic view of B part in the middle.

[0038] Mark explanation:

[0039] 100, battery;1, top cover assembly;10, top cover;101, through hole;11, cover body;111, first surface;12, first positioning structure;121, first step surface;122, second step surface;123, third step surface;13, positioning edge;131, groove bottom;20, conductive column;201, accommodation chamber;21, limiting frame;22, second positioning structure;221, fourth step surface;222, fifth step surface;223, sixth step surface;23, third positioning structure;231, seventh step surface;232, eighth step surface;233, ninth step surface;24, end plate;241, side face;242, end wall;3, winding core;31, electrode lug;4, shell;5, busbar;51, bonding surface;6, bottom cover. Specific implementation

[0040] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing in the drawing; and "inner" and "outer" refer to the outline of the device.

[0041] A battery is used for storing and releasing energy, and is a device capable of converting electrical energy into chemical energy or converting chemical energy into electrical energy. The battery includes a roll core, positive and negative poles, and a shell. The roll core is arranged in the shell, the positive and negative poles are arranged at one end of the shell or at two ends of the shell respectively, and the positive and negative pole ears of the roll core are electrically connected with the positive and negative poles respectively. The positive and negative poles are used for transmitting the electrical energy of the roll core to an electrical equipment or transmitting the electrical energy of a power supply (such as a power grid) to the roll core. The connection mode between the pole and the shell is welding and pressure connection, and the welding is the most common. In the battery with the welding as the connection mode, the pole is usually made of metal, such as copper, nickel, aluminum and the like. The pole and the metal part of the shell are connected together through a welding process to ensure good conduction of current and stable mechanical connection. In the pre-operation of welding the pole and the shell, the pole and the shell are aligned and positioned to ensure that the pole and the shell are within the assembly tolerance range, so as to improve the consistency of the battery assembly. In the related art, it is not easy to control the alignment and positioning, which not only consumes a lot of time, but also causes the problem of poor performance consistency of the batteries in the battery pack due to deviation from the tolerance, which is not conducive to the long-term stable operation of the battery pack. It can be seen that the accurate control and quality management of this link are very important.

[0042] Please refer to Figures 1 to 3 , Figure 1 The structural schematic diagram of the battery 100 provided by the embodiment of the present application is shown in the following figure, Figure 2 The explosion schematic diagram of the top cover assembly 1 provided by the embodiment of the present application is shown in the following figure, Figure 3 The cross-sectional schematic diagram of the top cover assembly 1 provided by the embodiment of the present application is shown in the following figure.

[0043] The application provides a top cover assembly 1 applied to a battery 100, which comprises a top cover 10 and a conductive column 20. The top cover 10 is provided with a through hole 101 penetrating through the top cover 10 and used for the electrode lug 31 of the winding core 3 to extend out, and the top cover 10 comprises a first positioning structure 12 arranged around the through hole 101 and spaced from the through hole 101. The conductive column 20 is connected to the top cover 10 and arranged around the through hole 101, and the conductive column 20 is provided with a receiving cavity 201 used for accommodating the electrode lug 31. The conductive column 20 comprises a first end facing the top cover 10, and the first end is provided with a second positioning structure 22. The first positioning structure 12 and the second positioning structure 22 are positioned and connected.

[0044] The application sets the first positioning structure 12 around the through hole 101 and spaced from the through hole 101 on the top cover 10, and sets the second positioning structure 22 on the first end of the conductive column 20, so that the conductive column 20 and the top cover 10 can be positioned and connected through the first positioning structure 12 and the second positioning structure 22 before the conductive column 20 is welded with the top cover 10, thereby reducing the difficulty of positioning and aligning between the conductive column 20 and the top cover 10, and enabling the assembly tolerance between the conductive column 20 and the top cover 10 to be controlled within a reasonable range, which is beneficial to improving the consistency of each battery 100 in the battery pack.

[0045] Please refer to Figures 3 to 5 , Figure 4 for Figure 3 the enlarged schematic view of the A part, Figure 5 the structural schematic view of the first positioning structure 12 and the second positioning structure 22 of another embodiment of the application.

[0046] The first positioning structure 12 can comprise a positioning groove, and the second positioning structure 22 can comprise a positioning flange, or the first positioning structure 12 can comprise a positioning flange, and the second positioning structure 22 can comprise a positioning groove, and the positioning flange is fitted in the positioning groove. Specifically, in an embodiment, the top cover 10 further comprises a cover body 11, the cover body 11 is provided with the through hole 101, the first positioning structure 12 is a positioning groove arranged around the through hole 101 and spaced from the through hole 101, and the first end of the conductive column 20 can comprise a positioning flange. During the positioning and aligning operation before the conductive column 20 is welded with the top cover 10, the positioning flange can be fitted in the positioning groove, so that the difficulty of positioning and aligning of the conductive column 20 can be reduced, and then when the conductive column 20 is welded with the top cover 10, the displacement of the conductive column 20 can be effectively prevented, the assembly efficiency and the production consistency can be improved. It can be understood that the first positioning structure 12 can also be a positioning flange arranged around the through hole 101 and spaced from the through hole 101. In this embodiment, the first end of the conductive column 20 is provided with a positioning groove, and the positioning flange is fitted in the positioning groove.

[0047] Please refer to Figure 6 ,Figure 6 The first positioning structure 12 and the second positioning structure 22 of another embodiment of the present application are shown in the structural diagram. In another embodiment of the present application, the first positioning structure 12 can also include a first positioning step, and the second positioning structure 22 can also include a second positioning step. The first positioning step and the second positioning step can be matched to realize the alignment operation before the welding of the conductive column 20 and the top cover 10. The surface of the first positioning step and the surface of the second positioning step are in close contact, which can effectively limit the movement of the conductive column 20 relative to the top cover 10, avoid the movement of the conductive column 20 during the welding process, and make the subsequent welding operation proceed smoothly, which helps to ensure that the assembly tolerance between the conductive column 20 and the top cover 10 is within the set range and improves the consistency of each battery 100.

[0048] The top cover 10 includes a first surface 111 in the thickness direction. The top cover 10 is also provided with a groove, the slot of the groove is located on the first surface 111, the through hole 101 is arranged through the groove bottom 131, and the first positioning step is formed between the groove bottom 131 and the first surface 111. The top cover 10 provided in the embodiment of the present application can include a positioning edge 13 in addition to the cover body 11. The cover body 11 is formed in the area where the first surface 111 is located, and the positioning edge 13 is formed in the area where the groove bottom 131 is located.

[0049] Please refer to Figure 4 In the embodiment in which the first positioning structure 12 includes the positioning groove, the positioning groove can be arranged on the side of the cover body 11 close to the positioning edge 13, and the positioning groove surrounds the positioning edge 13 and is arranged at a distance from the positioning edge 13. Please refer to Figure 5 In the embodiment in which the first positioning structure 12 includes the positioning flange, the positioning flange can be connected to the cover body 11 or the positioning edge 13. One end of the positioning flange is connected to the first surface 111 or the groove bottom 131, and the other end of the positioning flange is away from the first surface 111 or the groove bottom 131, so as to be connected with the positioning groove. Please refer to Figure 6In the embodiment in which the first positioning structure 12 comprises a first positioning step, the first positioning step is connected between the cover 11 and the positioning edge 13, and comprises a first step surface 121, a second step surface 122 and a third step surface 123. The second step surface 122 is arranged between the first surface 111 and the groove bottom 131 in the thickness direction of the top cover 10, the first step surface 121 is connected between the first surface 111 and the second step surface 122 by bending, and the third step surface 123 is connected between the second step surface 122 and the groove bottom 131 by bending. The second positioning step is adapted to the first positioning step, and comprises a fourth step surface 221, a fifth step surface 222 and a sixth step surface 223. The fourth step surface 221 and the sixth step surface 223 are arranged in a spaced manner, and the fifth step surface 222 is connected between the fourth step surface 221 and the sixth step surface 223 by bending. The fourth step surface 221 abuts against the second step surface 122, and the sixth step surface 223 abuts against the groove bottom 131. The fifth step surface 222 is arranged opposite to the third step surface 123, that is, the surfaces of the first positioning step and the surfaces of the second positioning step can be in close contact, so as to limit the movement of the conductive column 20 relative to the top cover 10, and further ensure the accurate positioning of the conductive column 20 relative to the top cover 10.

[0050] In some embodiments, the thickness of the positioning edge 13 is between 20% and 30% of the thickness of the top cover 10. The inventors have found through experiments that, by thinning at least part of the top cover 10 to 20%-30% to form the positioning edge 13, the thickness of the positioning edge 13 is within a preset proportion range of the thickness of the cover 11, which can reduce the contact resistance between the top cover assembly 1 and the external circuit of the battery 100 on the premise of ensuring the structural strength, sealing performance, safety and long-term stability of the battery 100. On the one hand, reducing the thickness of the top cover 10 can improve the current conduction efficiency, thereby improving the power output and charge-discharge efficiency of the battery 100, since the performance of the battery 100 is often affected by the internal resistance. On the other hand, it is beneficial to reduce the weight of the battery 100, although the weight of the top cover 10 itself is not large, but in some application scenarios, it is beneficial to the lightweight design of the battery 100 as a whole, such as portable devices or battery 100 systems requiring high energy density.

[0051] Please refer to Figure 7 and Figure 8 , Figure 7 the explosion schematic diagram of the battery 100 provided by the embodiment of the present application, Figure 8A cross-sectional view of a battery 100 is provided. The battery 100 includes a housing 4, a winding core 3, and a top cover assembly 1. The housing 4 includes two ends arranged oppositely, and a cavity is arranged in the housing 4. The winding core 3 is arranged in the cavity of the housing 4, and the winding core 3 is provided with an electrode lug 31. The top cover assembly 1 is any one of the top cover assemblies 1 provided in the embodiments, and the top cover assembly 1 is connected to one end of the housing 4. The electrode lug 31 is arranged in a through opening 101 of the top cover assembly 1 and is arranged in a receiving cavity 201 of the top cover assembly 1.

[0052] Please refer to Figure 3 and Figure 9 , Figure 9 is Figure 3 an enlarged view of the B part in FIG. 10. In some embodiments, the conductive column 20 can include a limiting frame 21 and an end plate 24. The limiting frame 21 surrounds the receiving cavity 201 and includes a first end and a second end arranged oppositely to the first end. The electrode lug 31 extends into the receiving cavity 201 from the first end and is electrically connected to an inner wall of the limiting frame 21 facing the receiving cavity 201. The end plate 24 is connected to the second end. The second end includes a seventh step surface 231, an eighth step surface 232, and a ninth step surface 233. The seventh step surface 231 is arranged close to the receiving cavity 201 and is spaced apart from the ninth step surface 233. The eighth step surface 232 is arranged between the seventh step surface 231 and the ninth step surface 233. In the thickness direction of the end plate 24, the end plate 24 includes two opposite side surfaces 241 and an end wall 242 connected between the two side surfaces 241. One side surface 241 abuts against the seventh step surface 231, and the end wall 242 is arranged opposite to the eighth step surface 232.

[0053] For example, the limiting frame 21 can include a plurality of limiting edges. The plurality of limiting edges are connected to form a polygonal structure with two ends open. Each limiting edge is provided with a second positioning structure 22 facing one end of the top cover 10 and a third positioning structure 23 facing the other end of the top cover 10. The second positioning structure 22 is used for positioning connection with the first positioning structure 12, and the third positioning structure 23 is used for positioning connection with the end plate 24. It can be understood that the limiting frame can also have other shapes such as a cylindrical shape, and the shapes shown in the drawings do not limit the shape of the limiting frame.

[0054] In the process of assembling into the battery 100, firstly, the second positioning structure of the limiting frame 21 can be positioned and connected with the first positioning structure of the top cover 10, then the limiting frame 21 is welded to the top cover 10 along the joint edge formed by the limiting frame 21 and the top cover 10, then the top cover 10 is welded to one end of the shell 4, then the winding core 3 is placed in the cavity of the shell 4 from the other end of the top cover 10 away from the shell 4, and the electrode lug 31 of the winding core 3 passes through the through hole 101 of the top cover 10 and the first end of the limiting frame 21 in sequence, the electrode lug 31 is welded to the inner wall of the side of the limiting frame 21 facing the accommodation cavity 201, and finally, the end plate 24 is covered on the second end of the limiting frame 21, and the end plate 24 is welded to the limiting frame 21 along the edge of the end plate 24.

[0055] Please refer to Figure 7 In some embodiments, the battery 100 further comprises a busbar 5 accommodated in the accommodation cavity 201, the busbar 5 comprises a fitting surface 51, the fitting surface 51 is a curved surface, and the electrode lug 31 is attached to the fitting surface 51. Specifically, the busbar 5 can be made of conductive materials such as aluminum and copper, the busbar 5 serves as a current output point, and the plurality of electrode lugs 31 are concentrated and then output to an external load by the conductive column 20, or the busbar 5 is connected to an external charging device to charge itself. Before the end plate 24 is covered on the limiting frame 21, the plurality of electrode lugs 31 can be wound on the busbar 5 at the same time so that the electrode lugs 31 are tightly attached to the surface of the busbar 5, and the electrode lugs 31 can be welded to the busbar 5. Since the surface of the busbar 5 is curved, the electrode lugs 31 can be effectively prevented from being damaged by being pierced after being wound on the busbar 5.

[0056] In some embodiments, the battery 100 further comprises a bottom cover 6 arranged at two ends of the shell 4 opposite to the top cover 10, the shell 4 can be integrally connected with the top cover 10, and the winding core 3 is sealed and assembled in the cavity of the shell 4.

[0057] The embodiments of the utility model are described in detail above, and the principle and implementation mode of the utility model are described by applying specific examples in this paper, and the above embodiment description is only used to help understand the method and core idea of the utility model; meanwhile, for those skilled in the art, according to the idea of the utility model, the specific implementation mode and application range can be changed, and the above description should not be understood as the limitation of the utility model.

Claims

1. A top cover assembly applied to a battery, characterized in that, The application relates to a top cover for a battery, comprising: a top cover provided with a through hole for an electrode tab of a roll core to extend out of the top cover; the top cover comprises a first positioning structure arranged around the through hole and spaced from the through hole; a conductive column connected to the top cover and arranged around the through hole; the conductive column is provided with a receiving cavity for accommodating the electrode tab; the conductive column comprises a first end facing the top cover, and the first end is provided with a second positioning structure; the first positioning structure is in positioning connection with the second positioning structure. The first positioning structure comprises a positioning groove, and the second positioning structure comprises a positioning flange, or the first positioning structure comprises a positioning flange, and the second positioning structure comprises a positioning groove, and the positioning flange is matched in the positioning groove. The first positioning structure comprises a first positioning step, and the second positioning structure comprises a second positioning step, and the first positioning step is matched with the second positioning step. The top cover comprises a first surface in the thickness direction, and the top cover is further provided with a groove, and the groove is provided with a groove bottom and a groove mouth, the through hole is arranged through the groove bottom, and the first positioning step is formed between the groove bottom and the first surface.

2. The roof assembly of claim 1, wherein, The first positioning step comprises a first step surface, a second step surface and a third step surface, the second step surface is arranged between the first surface and the groove bottom in the thickness direction of the top cover, the first step surface is bent and connected between the first surface and the second step surface, and the third step surface is bent and connected between the second step surface and the groove bottom. The second positioning step comprises a fourth step surface, a fifth step surface and a sixth step surface, the fourth step surface and the sixth step surface are arranged in a spaced mode, the fifth step surface is bent and connected between the fourth step surface and the sixth step surface, the fourth step surface is in abutment with the second step surface, the sixth step surface is in abutment with the groove bottom, and the fifth step surface is arranged opposite to the third step surface.

3. The roof assembly of claim 1, wherein, The top cover further comprises a positioning edge arranged in the area of the groove bottom, and the thickness of the positioning edge is between 20% and 30% of the thickness of the top cover. The application relates to a battery, comprising: a shell provided with a cavity; a roll core accommodated in the cavity of the shell, and provided with an electrode tab; and a top cover assembly connected to one end of the shell, the electrode tab is arranged in a through hole of the top cover assembly and accommodated in a receiving cavity of the top cover assembly.

4. The roof assembly of claim 3, wherein, The conductive column comprises a limiting frame and an end plate, the limiting frame surrounds the receiving cavity, the limiting frame comprises a first end and a second end arranged opposite to the first end, the electrode tab extends into the receiving cavity from the first end, the electrode tab is electrically connected to an inner wall of one side of the limiting frame facing the receiving cavity, and the end plate is connected to the second end.

5. The roof assembly of claim 4, wherein, ​ ​ ​ 6. A roof assembly according to claim 4 or 5, characterised in that, ​ ​ 7. A battery, characterized by ​ ​ ​ ​ ​ 8. The battery of claim 7, wherein, ​ ​ ​ 9. The battery of claim 8, wherein, The second end comprises a seventh step surface, an eighth step surface and a ninth step surface, the seventh step surface is arranged close to the accommodation chamber and is spaced apart from the ninth step surface, and the eighth step surface is connected between the seventh step surface and the ninth step surface in a bent manner. In the thickness direction of the end plate, the end plate comprises two opposite side surfaces and an end wall connected between the two side surfaces, one side surface abuts against the seventh step surface, and the end wall is arranged opposite to the eighth step surface.

10. The battery according to any one of claims 7-9, characterized in that, The battery further comprises a busbar, the busbar is accommodated in the accommodation chamber, the busbar comprises a fitting surface, the fitting surface is a curved surface, and the electrode lug is attached to the fitting surface.

11. The battery according to any one of claims 7-9, characterized in that, The shell and the top cover of the top cover assembly are integrally connected.

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