Battery cover plate assembly, cylindrical battery and assembly process

Abstract

The present invention proposes a current collecting plate, a battery cover plate assembly, a cylindrical battery and an assembly process, wherein a plurality of through holes are provided on the current collecting plate, and the through holes are arranged at equal intervals around the axis of the current collecting plate, and the through holes are used for the pole lugs at the ends of the winding core in the axial direction to pass through and fall toward the side of the current collecting plate away from the winding core. Compared with the traditional penetration welding, the present invention can intuitively and controllably implement the welding of the pole lugs on the surface of the current collecting plate. On the one hand, the welding quality can be intuitively detected to avoid the occurrence of cold welding and leaking welding. On the other hand, the welding of the pole lugs and the current collecting plate can be achieved by using a laser with a lower intensity, avoiding the phenomenon of pole lug breakdown caused by excessively strong penetration welding in the traditional method, and greatly improving the welding yield of the current collecting plate and the pole lugs.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery cover assembly, a cylindrical battery and an assembly process. Background Art

[0002] As the size and capacity of cylindrical batteries continue to increase, the traditional way of leading out the tabs can no longer meet the overcurrent requirements of large cylindrical batteries. At present, in order to meet the overcurrent capacity of the core and improve the rate performance of cylindrical batteries, the core of cylindrical batteries mostly adopts a full-tab flattening design. The specific process is: after the core is made, the positive and negative tabs at both ends of the core are flattened, and then the tabs at both ends of the core are welded to the positive collector and the negative collector, respectively, and finally the core is packaged into a shell to form a battery. For example, the patent with publication number CN114361555A discloses a method for flattening a cylindrical battery with full tabs, which is to blend the originally upright tabs so that each tab is in contact to the maximum extent to achieve better current collection; the full tabs directly lead out the current and effectively reduce the internal resistance of the battery. At the same time, the full tabs are flattened in the same plane to facilitate the subsequent welding of the collector and ensure the current conduction effect.

[0003] However, there are some defects in the flattening welding process used in the prior art. On the one hand, when the pole ears at the end of the winding core are kneaded into a plane, the pole ears overlap each other, which will cause gaps between the pole ears, making it easy to have cold welding or leaking welding when welding the collector plate and the pole ears, and it is impossible to intuitively detect the welding quality, resulting in the inability to guarantee the welding yield. On the other hand, with the increase in the design rate and capacity of cylindrical single cells, in order to ensure the battery's current capacity, the thickness of the collector plate will also be greatly increased accordingly. As a result, a larger laser intensity is required for laser welding, first breaking through the collector plate, and then welding with the pole ears under the collector plate. However, for high-intensity laser penetration welding, when the laser breaks through the collector plate, it is very easy to break through the pole ears at the bottom of the collector plate, causing a short circuit, thereby reducing the welding yield. Summary of the invention

[0004] In view of this, the present invention proposes a battery cover assembly, a cylindrical battery and an assembly process to solve the problem of cold welding, welding leakage and breakdown that are easy to occur when welding the collector plate and the tab, resulting in a reduced welding yield.

[0005] The technical solution of the present invention is achieved in this way:

[0006] In a first aspect, the present invention provides a current collecting disk having a plurality of through holes formed thereon, the through holes being arranged at equal intervals around the axis of the current collecting disk, the through holes being used for allowing the pole ears at the axial ends of the winding core to pass through and fall toward a side of the current collecting disk away from the winding core.

[0007] Based on the above technical solution, preferably, the through holes on the current collector plate are arranged staggeredly, and the tabs pass through the through holes and are flattened toward the center of the current collector plate.

[0008] Further, preferably, at least two adjacent tabs pass through the through hole, and at least two adjacent tabs are aligned with each other in the radial direction of the core.

[0009] Further, preferably, a groove for embedding the tab is provided on one side of the through hole facing the center of the current collector plate.

[0010] In a second aspect, the present invention provides a battery cover assembly, including a cover plate, a terminal post, and the current collector plate described above. The terminal post is fixedly arranged at the center of the cover plate and is electrically isolated from the cover plate. The battery cover assembly further includes a connecting piece. One end of the connecting piece in the length direction is fixedly connected to the terminal post at the center of the cover plate, and the other end of the connecting piece is rotatably connected to the edge of the side of the current collector plate away from the core. The distances from the center of the cover plate and the center of the current collector plate to the rotation point of the connecting piece and the current collector plate are equal.

[0011] Based on the above technical solution, preferably, the connecting piece includes a connecting portion and a rotating portion located below one end of the connecting portion. The rotating portion is rotatably connected to the edge of the side of the current collector plate away from the core through a rotating member, and one end of the connecting portion away from the rotating portion is fixedly connected to the terminal post at the center of the cover plate.

[0012] Further, preferably, the battery cover assembly further includes an upper insulating member, a lower insulating member, and a riveting member. The terminal post, the upper insulating member, the cover plate, the lower insulating member, and the connecting portion are sequentially connected through the riveting member.

[0013] Preferably, a limiting protrusion in contact with the side of the current collector plate away from the core is provided on the surface of the lower insulating member.

[0014] In a third aspect, the present invention provides a cylindrical battery, including a housing, a core, and the battery cover assembly described above. The core is arranged in the housing. The current collector plate in the battery cover assembly is welded to the tab at the axial end of the core, and the cover plate in the battery cover assembly is fixedly connected to the open end of the housing.

[0015] In a fourth aspect, the present invention provides a cylindrical battery assembly process, including the following steps:

[0016] S1. Pass the tabs at the end of the core through the through holes on the current collector plate, flatten the tabs toward the center of the current collector plate, and weld the current collector plate and the tabs.

[0017] S2. Rotate the connecting piece horizontally relative to the collecting plate so that the cover plate and the connecting piece cover the surface of the collecting plate synchronously, and make the center of the winding core and the center of the cover plate coaxial;

[0018] S3. Put the winding core into the shell and weld the cover plate and the opening end of the shell.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The current collecting disk disclosed in the present invention arranges a plurality of through holes at equal intervals around the axis of the current collecting disk. When the current collecting disk and the winding core are welded, the pole ear at the end of the winding core in the axial direction is passed through the through hole and falls toward the side of the current collecting disk away from the winding core, so that the current collecting disk and the end surface of the winding core are fitted together, and the flattened pole ear and the current collecting disk are welded on the side of the current collecting disk away from the winding core. Compared with the traditional penetration welding, the present invention can intuitively and controllably implement the welding of the pole ear on the surface of the current collecting disk. On the one hand, the welding quality can be intuitively detected to avoid the occurrence of cold welding and leaking welding. On the other hand, the welding of the pole ear and the current collecting disk can be achieved by using a laser with lower intensity, avoiding the phenomenon of pole ear breakdown caused by excessively strong penetration welding in the traditional method, thereby greatly improving the welding yield of the current collecting disk and the pole ear.

[0021] (2) By allowing at least two adjacent and mutually aligned pole tabs in the radial direction of the winding core to pass through the through-holes, on the one hand, the number of through-holes on the current collecting disk can be reduced, thereby increasing the welding area between the pole tabs and the current collecting disk; on the other hand, when multiple pole tabs pass through the through-holes at the same time, the pole tabs can be stacked in the horizontal direction, thereby ensuring that the thickness of the pole tabs on the current collecting disk is uniform after flattening and welding, thereby improving the current carrying capacity;

[0022] (3) By providing a groove on the side of the through hole facing the center of the current collecting disk, the pole ear can be flattened toward the center of the current collecting disk after passing through the through hole, and the pole ear can be horizontally embedded in the groove, thereby reducing the stacking on the surface of the current collecting disk, reducing the space occupancy of the current collecting disk in the axial direction of the battery housing, and improving the battery energy density;

[0023] (4) The battery cover plate assembly disclosed in the present invention is provided with a connecting piece so that one end of the connecting piece in the length direction is fixedly connected to the pole at the center of the cover plate, and the other end of the connecting piece is rotationally connected to the edge of the side of the current collecting disk away from the winding core, and at the same time, the distances from the center of the cover plate and the center of the current collecting disk to the connecting piece and the rotation point of the current collecting disk are equal. After the coaxial welding of the current collecting disk and the winding core is completed, the connecting piece is horizontally rotated relative to the current collecting disk so that the cover plate and the connecting piece are synchronously covered on the surface of the current collecting disk, so that the center of the winding core and the center of the cover plate can be coaxial. Compared with the prior art, the present invention does not need to bend the current collecting disk, and can conveniently and quickly realize the precise alignment of the cover plate and the shell, thereby avoiding the occurrence of defective products caused by the bending process, greatly improving the production efficiency and product quality of cylindrical batteries;

[0024] (5) The battery cover plate assembly disclosed by the present invention does not require bending of the current collector plate, and can improve the space utilization rate of the winding core in the height direction of the cylindrical battery, thereby increasing the energy density of the battery. Additionally, since the current collector plate does not need to be bent, the thickness of the battery current collector plate can be continuously increased to meet the design requirements of high-rate and large-capacity cylindrical batteries, expanding the design space and application scope of large cylindrical batteries. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1 Schematic three-dimensional structure diagram of the current collector plate disclosed by the present invention;

[0027] Figure 2 Schematic three-dimensional structure diagram of the current collector plate and the winding core disclosed by the present invention;

[0028] Figure 3 Schematic assembly structure diagram of the current collector plate and the winding core disclosed by the present invention;

[0029] Figure 4 Schematic three-dimensional structure diagram of the battery cover plate assembly from the first perspective disclosed by the present invention;

[0030] Figure 5 Schematic three-dimensional structure diagram of the battery cover plate assembly from the second perspective disclosed by the present invention;

[0031] Figure 6 Schematic three-dimensional structure diagram of the battery cover plate assembly from the third perspective disclosed by the present invention;

[0032] Figure 7 Schematic plan structure diagram of the battery cover plate assembly disclosed by the present invention;

[0033] Figure 8 is Figure 7 partial enlarged view at A in

[0034] Figure 9 is Figure 8 partial enlarged view at B in

[0035] Figure 10 Schematic exploded structure diagram of the cylindrical battery disclosed by the invention;

[0036] Figure 11 Schematic plan structure diagram of the cylindrical battery disclosed by the present invention;

[0037] Reference Signs:

[0038] 11. Core; 12. Current collector plate; 121. Through hole; 111. Tab; 122. Groove; 2. Battery cover assembly; 21. Cover plate; 22. Terminal post; 23. Connecting piece; 231. Connecting portion; 232. Rotating portion; 24. Rotating member; 25. Upper insulating member; 26. Lower insulating member; 27. Riveting member; 261. Limit projection; 28. Sealing member; 3. Cylindrical battery; 31. Housing. Detailed Embodiment

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] In order to solve the problems of easy occurrence of virtual soldering, missed soldering and breakdown during the welding of the current collector plate and the tab, resulting in a reduction in the welding yield, the present invention adopts the following technical solutions to achieve.

[0041] As Figure 1 shown, in combination with Figures 2 - 3 , an embodiment of the present invention discloses a current collector plate. A plurality of through holes 121 are provided on the current collector plate 12. The through holes 121 are arranged at equal intervals around the axis of the current collector plate 12. As a component of the cylindrical battery, the core 11 has tabs 111 of different polarities respectively arranged at both ends in the axial direction. The cross-sectional areas of the current collector plate 12 and the core 11 are adapted to each other. Tabs 111 corresponding to the positions of the through holes 121 are provided at the axial ends of the core 11. The inner contour of the through hole 121 is adapted to the outer contour of the tab 111. The tab 111 passes through the through hole 121 and lies down towards the side of the current collector plate 12 away from the core 11.

[0042] Adopting the above technical solution, when welding the current collector plate 12 and the core 11, the tab 111 passes through the through hole 121 and lies down towards the side of the current collector plate 12 away from the core 11, so that the end faces of the current collector plate 12 and the core 11 are fitted together, and the flattened tab 111 and the current collector plate 12 are welded on the side of the current collector plate 12 away from the core 11. Compared with the traditional penetration welding, the present invention can visually and controllably perform the welding of the tab 111 on the surface of the current collector plate 12. On the one hand, the welding quality can be visually detected to avoid virtual soldering and missed soldering. On the other hand, the welding of the tab 111 and the current collector plate 12 can be realized by a laser with lower intensity, avoiding the breakdown phenomenon of the tab 111 caused by the too strong penetration welding in the traditional method, and greatly improving the welding yield of the current collector plate 12 and the tab 111.

[0043] In some preferred embodiments, the through holes 121 on the current collecting plate 12 are arranged staggeredly, and the tab 111 passes through the through hole 121 and lies down towards the center of the current collecting plate 12. With this arrangement, the tab 111 can pass through the through hole 121 one by one, and all the tabs 111 are flattened towards the center of the current collecting plate 12, which can prevent the tabs 111 from overlapping each other, so that the flattening directions of all the tabs 111 on the surface of the current collecting plate 12 are unified. Thus, when welding, it is convenient to avoid the phenomenon of virtual soldering or missed soldering caused by the overlapping of the tabs 111, and the welding yield of the current collecting plate 12 and the tab 111 is improved.

[0044] In some preferred embodiments, at least two adjacent tabs 111 pass through the through hole 121, and at least two adjacent tabs 111 are aligned with each other in the radial direction of the core 11. With this arrangement, on the one hand, the number of through holes 121 opened on the current collecting plate 12 can be reduced, and the welding area between the tab 111 and the current collecting plate 12 can be increased. On the other hand, when multiple tabs 111 pass through the through hole 121 at the same time, the tabs 111 can be stacked in the horizontal direction, ensuring that the thickness of the tabs 111 on the current collecting plate 12 is uniform after being flattened and welded, and improving the current-carrying capacity.

[0045] In some preferred embodiments, by providing a groove 122 on the side of the through hole 121 facing the center of the current collecting plate 12, when the tab 111 passes through the through hole 121 and lies down towards the center of the current collecting plate 12, the tab 111 can be horizontally embedded into the groove 122, reducing the stacking on the surface of the current collecting plate 12 and reducing the space occupancy rate of the current collecting plate 1 in the axial direction within the battery case 31, and improving the battery energy density.

[0046] The present invention also provides a battery cover assembly 2. Referring to the attached Figures 4 - 9 As shown, it includes a cover plate 21, a terminal post 22 and the current collecting plate 12 disclosed in the above embodiments. The terminal post 22 is fixedly arranged at the center of the cover plate 21 and is electrically isolated from the cover plate 21.

[0047] In order to establish an electrical connection between the current collecting plate 12 and the terminal post 22, the battery cover assembly 2 of this embodiment further includes a connecting piece 23. One end of the connecting piece 23 in the length direction is fixedly connected to the terminal post 22 at the center of the cover plate 21, and the other end of the connecting piece 23 is rotatably connected to the edge of the side of the current collecting plate 12 away from the core 11. The distances from the center of the cover plate 21, the center of the current collecting plate 12 to the rotation point of the connecting piece 23 and the current collecting plate 12 are equal.

[0048] With this setting, before welding the tab 111 at the end of the current collector plate 12 and the core 11, one end of the connecting piece 23 is rotated horizontally relative to the current collector plate 12, so that the connecting piece 23 is located outside the current collector plate 12. At this time, the cover plate 21 is driven by the connecting piece 23 and moves away from the current collector plate 12 in the horizontal direction. After the current collector plate 12 and the core 11 are welded coaxially, by horizontally rotating the connecting piece 23 relative to the current collector plate 12, the cover plate 21 and the connecting piece 23 are synchronously covered on the surface of the current collector plate 12, and the coaxiality of the centers of the core 11 and the cover plate 21 can be achieved. Compared with the prior art, the present invention does not need to bend the current collector plate 12, and can conveniently and quickly achieve the accurate alignment of the cover plate 21 and the housing 31, thereby avoiding the appearance of defective products caused by the bending process and greatly improving the production efficiency and product quality of the cylindrical battery 3.

[0049] In addition, the battery cover plate assembly 2 disclosed in this embodiment also has other beneficial effects. Specifically, the battery cover plate assembly 2 of this embodiment does not need to bend the current collector plate 12, and can improve the space utilization rate of the core 11 in the height direction of the cylindrical battery 3, thereby improving the energy density of the battery; in addition, since the current collector plate 12 does not need to be bent, the battery current collector plate 12 can be continuously increased in the thickness direction to meet the design requirements of large-rate and large-capacity cylindrical batteries 3, expanding the design space and application range of large cylindrical batteries 3.

[0050] This embodiment shows a preferred structure of the connecting piece 23. Specifically, the connecting piece 23 is a strip-shaped structure, which includes a connecting portion 231 and a rotating portion 232 located below one end of the connecting portion 231. The material of the entire connecting piece 23 is the same as that of the current collector plate 12. This can avoid the increase of contact internal resistance and the reduction of over-current capacity caused by the electrical connection of different materials.

[0051] In this embodiment, the rotating portion 232 is rotatably connected to the edge of the surface of the current collector plate 12 away from the core 11 through a rotating member 24. Preferably, the rotating member 24 can be a rotating pin or a rotating shaft or other components that can enable the horizontal rotation connection between the connecting piece 23 and the current collector plate 12. One end of the connecting portion 231 away from the rotating portion 232 is fixedly connected to the pole column 22 at the center of the cover plate 21. With this setting, by arranging the rotating portion 232 below one end of the connecting portion 231, after the connecting piece 23 rotates above the current collector plate 12, there is a certain gap between the connecting portion 231 and the surface of the current collector plate 12, avoiding the connecting piece 23 scraping the tab 111 on the surface of the current collector plate 12 during the horizontal rotation process and causing scratches on the tab 111.

[0052] The battery cover assembly 2 of the present invention further includes an upper insulating member 25, a lower insulating member 26 and a riveting member 27. The pole column 22, the upper insulating member 25, the cover plate 21, the lower insulating member 26 and the connecting portion 231 are sequentially connected by the riveting member 27. In this embodiment, the riveting member 27 passes through the connecting portion 231, and then sequentially passes through the lower insulating member 26, the cover plate 21, and the upper insulating member 25 to achieve riveting with the pole column 22. In this embodiment, the upper insulating member 25 is used to keep electrical isolation between the pole column 22 and the cover plate 21, and the lower insulating member is used to ensure electrical isolation between the connecting piece 23 and the cover plate 21.

[0053] As some embodiments, the pole column 22 can be set to be circular and located at the center of the cover plate 21. This design can be applied to the cylindrical battery 3 with a smaller diameter. Of course, as other embodiments, the pole column 22 can be set to be a rectangular structure. Thus, the riveting member 27 is riveted to both ends in the length direction of the pole column 22, and the two riveting members 27 are symmetric with respect to the center of the cover plate 21. With this setting, enough space can be left for the liquid injection hole in the radial direction of the pole column 22 on the top cover. This structural setting can be applied to the cylindrical battery 3 with a larger diameter.

[0054] In order to achieve insulation between the riveting member 27 and the cover plate 21, the battery cover assembly 2 of this embodiment is also provided with a sealing member 28. The sealing member 28 is arranged between the cover plate 21 and the riveting member 27. On the one hand, it electrically isolates the riveting member 27 and the cover plate 21. On the other hand, it can seal the cover plate 21 to avoid electrolyte leakage.

[0055] As some preferred embodiments, when the cover plate 21 rotates to be coaxial with the surface of the current collector plate 12, in order to avoid a gap between the current collector plate 12 and the lower insulating member 26, resulting in the axial movement of the winding core 11 in the housing 31, a limiting protrusion 261 is provided on the surface of the lower insulating member 26 in this embodiment, which contacts the side of the current collector plate 12 away from the winding core 11. There is a certain fitting gap between the limiting protrusion 261 and the current collector plate 12, that is, it is ensured that when the cover plate 21 rotates to the surface of the current collector plate 12, the limiting protrusion 261 will not scrape the ear 111 on the current collector plate 12. At the same time, after the winding core 11 and the battery cover assembly 2 are put into the housing, the limiting protrusion 261 can contact the surface of the current collector plate 12, thereby restricting the axial movement of the current collector plate 1 in the housing 31, and further improving the structural stability and reliability of the cylindrical battery 3.

[0056] The present invention also provides a cylindrical battery 3, referring to the attached Figure 10 and 11 As shown, it includes a housing 31, a winding core 11 and the battery cover assembly 2. The winding core 11 is arranged in the housing 31. The current collector plate 12 in the battery cover assembly 2 is welded to the ear 111 at the axial end of the winding core 11, and the cover plate 21 in the battery cover assembly 2 is fixedly connected to the open end of the housing 31.

[0057] In the above embodiment, when the housing 31 has openings at both ends, two battery cover assemblies 2 are provided. The current collector plate 12 on one battery cover assembly 2 is welded to the positive end of the wound core 11, and the current collector plate 12 on the other battery cover assembly 2 is welded to the negative end of the wound core 11. The cover plates 21 on the two battery cover assemblies 2 are respectively welded to the two open ends of the housing 31, thereby enclosing the wound core 11 in the housing 31.

[0058] The present invention provides a cylindrical battery assembly process, which includes the following steps:

[0059] S1. Pass the tab 111 at the end of the wound core 11 through the through hole 121 on the current collector plate 12, flatten the tab 111 in the direction of the center of the current collector plate 12, and weld the current collector plate 12 and the tab 111.

[0060] S2. Horizontally rotate the connecting piece 23 relative to the current collector plate 12 so that the cover plate 21 and the connecting piece 23 simultaneously cover the surface of the current collector plate 12, and make the centers of the wound core 11 and the cover plate 21 coaxial.

[0061] S3. Insert the wound core 11 into the housing and weld the cover plate 21 to the open end of the housing 31.

[0062] Specifically, by providing two battery cover assemblies 2, defined as a positive battery cover assembly and a negative battery cover assembly, first rotate the cover plate 21 on the positive battery cover assembly away from the current collector plate 12 through the rotation of the connecting piece 23, so that the tab 111 at the positive end of the wound core 11 passes through the through hole 121 on the current collector plate 12, and after flattening, welding is carried out. After the welding is completed, rotate the cover plate 21 and the connecting piece 23 to the surface of the current collector plate 12 to make the cover plate 21, the current collector plate 12 and the wound core 11 coaxial. Insert the positive battery cover assembly and the wound core 11 into the housing. Weld the current collector plate 12 on the negative battery cover assembly to the tab 111 at the negative end of the wound core 11 by the same method as above. After the welding is completed, rotate the cover plate 21 and the connecting piece 23 on the negative battery cover assembly to the surface of the current collector plate 12, and ensure that the cover plate 21, the current collector plate 12 and the wound core 11 are coaxial. Weld the cover plates 21 on the positive battery cover assembly and the negative battery cover assembly 2 to both ends of the housing 31 respectively, thereby completing the assembly of the cylindrical battery 3.

[0063] In this embodiment, the battery cover plate assembly 2 disclosed by the present invention can improve the space utilization rate of the winding core 11 in the height direction of the cylindrical battery 3 and increase the energy density of the battery because the battery cover plate assembly 2 is used and there is no need to bend the current collector plate 12. Additionally, since there is no need to bend the current collector plate 12, the battery current collector plate 12 can be continuously increased in the thickness direction to meet the design requirements of high-rate and large-capacity cylindrical batteries 3, expanding the design space and application range of large cylindrical batteries 3. At the same time, because the cylindrical battery 3 uses the current collector plate 1, the assembly structure of the tab 111 in the current collector plate 1 and the current collector plate 12 can improve the welding yield of the current collector plate 12 and the tab 111, thereby improving the yield rate of the cylindrical battery 3 and enhancing the safety and reliability of the cylindrical battery 3.

[0064] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery cover assembly, characterized in that: It includes a cover plate (21), a terminal post (22) and a current collector plate (12). The terminal post (22) is fixedly arranged at the center of the cover plate (21) and is electrically isolated from the cover plate (21). A plurality of through holes (121) are formed in the current collector plate (12), and the through holes (121) are arranged at equal intervals around the axis of the current collector plate (12). The through holes (121) are used for the tabs (111) at the axial ends of the winding core (11) to pass through and fall down towards the side of the current collector plate (12) away from the winding core (11). It further includes a connecting piece (23). One end of the connecting piece (23) in the length direction is fixedly connected to the terminal post (22) at the center of the cover plate (21), and the other end of the connecting piece (23) is horizontally rotatably connected to the edge of the side of the current collector plate (12) away from the winding core (11). The distances from the center of the cover plate (21) and the center of the current collector plate (12) to the rotation point of the connecting piece (23) and the current collector plate (12) are equal.

2. The battery cover assembly according to claim 1, wherein: The through holes (121) on the current collector plate (12) are arranged staggeredly, and the tabs (111) pass through the through holes (121) and fall down towards the center of the current collector plate (12).

3. The battery cover plate assembly according to claim 2, characterized in that: At least two adjacent tabs (111) pass through the through hole (121), and at least two adjacent tabs (111) are aligned with each other in the radial direction of the winding core (11).

4. The battery cover plate assembly according to claim 2, wherein: A groove (122) for the tab (111) to be embedded is arranged on the side of the through hole (121) facing the center of the current collector plate (12).

5. The battery cover assembly according to claim 1, wherein: The connecting piece (23) includes a connecting portion (231) and a rotating portion (232) located below one end of the connecting portion (231). The rotating portion (232) is rotatably connected to the edge of the side of the current collector plate (12) away from the winding core (11) through a rotating member (24), and one end of the connecting portion (231) away from the rotating portion (232) is fixedly connected to the terminal post (22) at the center of the cover plate (21).

6. The battery cover assembly according to claim 5, wherein: The battery cover plate assembly (2) further includes an upper insulating member (25), a lower insulating member (26) and a riveting member (27). The terminal post (22), the upper insulating member (25), the cover plate (21), the lower insulating member (26) and the connecting portion (231) are sequentially connected through the riveting member (27).

7. The battery cover assembly according to claim 6, characterized in that: A limiting protrusion (261) in contact with the side of the current collector plate (12) away from the winding core (11) is arranged on the surface of the lower insulating member (26).

8. A cylindrical battery, comprising a housing (31), a wound core (11), and the battery cover assembly (2) as described in claim 7, characterized in that: The winding core (11) is arranged in the housing (31). The current collector plate (12) in the battery cover plate assembly (2) is welded to the tabs (111) at the axial ends of the winding core (11), and the cover plate (21) in the battery cover plate assembly (2) is fixedly connected to the opening end of the housing (31).

9. A cylindrical battery assembly process, which utilizes the cylindrical battery as described in claim 8, is characterized in that, It includes the following steps: S1. Pass the tabs (111) at the end of the winding core (11) through the through holes (121) on the current collector plate (12), flatten the tabs (111) towards the center of the current collector plate (12), and weld the current collector plate (12) and the tabs (111). S2. Horizontally rotate the connecting piece (23) relative to the current collector plate (12) so that the cover plate (21) and the connecting piece (23) simultaneously cover the surface of the current collector plate (12), and make the centers of the core (11) and the cover plate (21) coaxial; S3. Insert the core (11) into the shell and weld the cover plate (21) to the open end of the shell (31).

Images