Current collector plate assembly, battery cover plate assembly, cylindrical battery and assembly process

Abstract

The present invention provides a current collector plate assembly, a battery cover plate assembly, a cylindrical battery and an assembly process, including: a current collector plate body, one end of the current collector plate body has a first connection part; a connecting piece, both ends of the connecting piece in the length direction have a second connection part and a third connection part respectively, the second connection part is used for fixedly connecting with the center of the battery cover plate, and the third connection part is rotatably connected with the first connection part; the distance from the center of the current collector plate body to the first connection part is equal to the distance from the second connection part to the third connection part. Compared with the prior art, the present invention does not need to bend the current collector plate, and can conveniently and quickly achieve accurate alignment between the cover plate and the housing, 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.

Description

Technical Field

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

[0002] With the continuous development of new energy battery technology, the energy density of lithium-ion batteries is also constantly increasing. Lithium-ion batteries are currently mainly divided into three development directions: soft-pack batteries, square batteries, and cylindrical batteries. With the release of the 4680 large cylindrical battery, the size and capacity of cylindrical batteries are increasingly developing in the direction of larger sizes.

[0003] For traditional cylindrical batteries 18650 and 21700, the positive and negative electrode cores are designed to be led out by single or double tabs. The positive tab is laser spot welded to the cover plate, and the negative tab is generally connected to the housing by resistance welding. The solder joints formed by the positive and negative tabs are small solder joints. After welding, since the led-out tabs are thin and soft, it is relatively easy to bend and close the tabs. However, with the continuous increase in the size and capacity of cylindrical batteries, the traditional tab leading-out method can no longer meet the over-current requirements of large cylindrical batteries. Currently, to meet the over-current capacity of the core, the core mostly adopts a full-tab flattened design and is welded to the tab plane at the end of the core through a current collector plate.

[0004] Chinese patents with publication numbers CN217182372U and CN109360932A both disclose a common structure of the cover plate and current collector plate of a large cylindrical battery. After the current collector plate is laser welded to the core, to meet the requirements of shell insertion, the current collector plate needs to be bent twice to make the core and the center of the cover plate coaxial, so as to complete the assembly process of shell insertion and cover closing. The internal core is compressed and stressed through the current collector plate bent in a "Z" shape to ensure that the core does not shake up and down inside the battery.

[0005] However, in the cylindrical batteries in the prior art, the current collector plate is mostly of an integral structure. One end of the current collector plate is welded to the core, and the other end is connected to the pole column on the cover plate. To ensure the accuracy of battery shell insertion, the current collector plate needs to be bent twice, and the two bending points must be precise to ensure the accuracy of battery shell insertion. From the perspective of battery manufacturing, there are more points to be controlled in the bending process. If there is a deviation at any one point, it will cause the cover plate and the housing to be misaligned, resulting in an increase in the defective rate of the bending process.

[0006] In addition, with the increase in the design rate and capacity of cylindrical single-cell batteries, in order to ensure the overcurrent capacity of the batteries, the thickness of the current collector plate will increase significantly accordingly, and the difficulty of bending the integrated current collector plate will increase greatly. The anti-bending abilities of copper and aluminum materials are difficult to meet the design requirements of large-capacity and high-rate batteries. The current current collector plate bending technology will limit the growth of the rate performance and capacity of cylindrical batteries. At the same time, the thicker the current collector plate, the thickness will increase multiplicatively after bending, resulting in a decrease in the space utilization rate in the height direction of the wound core, actually leading to a decrease in the design size in the height direction of the wound core and a reduction in the energy density of the battery. Summary of the Invention

[0007] In view of this, the present invention provides a current collector plate assembly, a battery cover plate assembly, a cylindrical battery and an assembly process to solve the problems that the existing current collector plate bending process has dimensional deviations, resulting in the inability to guarantee the accuracy of the battery entering the shell and a high defective rate in the bending process.

[0008] The technical solution of the present invention is realized as follows:

[0009] In a first aspect, the present invention provides a current collector plate assembly, including:

[0010] A current collector plate body, one end of the current collector plate body has a first connection portion;

[0011] A connecting piece, both ends in the length direction of the connecting piece have a second connection portion and a third connection portion respectively. The second connection portion is used for fixedly connecting with the center of the battery cover plate, and the third connection portion is rotatably connected with the first connection portion;

[0012] The distance from the center of the current collector plate body to the first connection portion is equal to the distance from the second connection portion to the third connection portion.

[0013] On the basis of the above technical solution, preferably, the current collector plate assembly further includes a connection component arranged between the first connection portion and the second connection portion, and the connection component is used for rotatably connecting the current collector plate body and the connecting piece.

[0014] Furthermore, preferably, the connection component includes a first sheet body, a connecting column and a second sheet body. Both the first connection portion and the second connection portion are configured as through holes. The connecting column passes through the first connection portion and the second connection portion. The first sheet body is arranged on the side of the connecting piece away from the current collector plate body, and the first sheet body is fixedly connected with one end of the connecting column. The second sheet body is arranged on the side of the current collector plate body away from the connecting piece, and the second sheet body is fixedly connected with the other end of the connecting column.

[0015] Further, preferably, the connection component further includes a shrapnel located between the connection piece and the current collector plate body. The shrapnel is sleeved on the connection post. One end of the shrapnel abuts against the connection piece, and the other end of the shrapnel abuts against the current collector plate body.

[0016] In a second aspect, the present invention provides a battery cover plate assembly, including a cover plate, a pole column, and the current collector plate assembly as described above. The pole column is fixedly arranged at the center of the cover plate and is electrically isolated from the cover plate. The connection piece is fixedly connected to the pole column through the second connection portion.

[0017] Based on the above technical solution, preferably, it further includes an upper insulating member, a lower insulating member, and a riveting member. The pole column, the upper insulating member, the cover plate, the lower insulating member, and the connection piece are sequentially connected through the riveting member.

[0018] In a third aspect, the present invention provides a cylindrical battery, including a housing, a wound core, and the battery cover plate assembly as described above. The wound core is arranged in the housing. The current collector plate body in the battery cover plate assembly is welded to the positive extreme of the wound core, and the cover plate in the battery cover plate assembly is fixedly connected to the open end of the housing.

[0019] Based on the above technical solution, preferably, it further includes a negative current collector plate. A welding portion is fixedly arranged at the center of the negative current collector plate. A through hole is opened at the center of the bottom surface of the housing. The welding portion passes through the through hole and is welded to the housing. A liquid injection hole is opened at the center of the welding portion. A plurality of welding areas are arranged on the negative current collector plate. The welding areas are arranged at equal intervals around the central axis of the welding portion. The welding areas are used for welding to the negative extreme of the wound core.

[0020] Further, preferably, an explosion-proof notch is arranged on the bottom surface of the housing.

[0021] In a fourth aspect, the present invention also discloses an assembly process of a cylindrical battery, including the following steps:

[0022] S1. Concentrically contact and weld the negative extreme of the flattened wound core and the negative current collector plate, and concentrically contact and weld the positive extreme of the wound core and the current collector plate body;

[0023] S2. Horizontally rotate the connection piece relative to the current collector plate body so that the cover plate and the connection piece synchronously cover the surface of the current collector plate body, and make the center of the wound core and the center of the cover plate coaxial;

[0024] S3. Put the wound core into the housing, weld the negative current collector plate to the inner bottom surface of the housing, and then weld the cover plate to the open end of the housing.

[0025] The present invention has the following beneficial effects compared with the prior art:

[0026] (1) The current collector plate assembly disclosed by the present invention fixes the second connection part at one end in the length direction of the connecting piece to the pole column at the center of the battery cover plate, and the third connection part at the other end is rotatably connected to the first connection part on the current collector plate body. At the same time, the distance from the center of the current collector plate body to the first connection part is equal to the distance from the second connection part to the third connection part. After the current collector plate body and the winding core are welded coaxially, by horizontally rotating the connecting piece relative to the current collector plate body, the cover plate and the connecting piece can be synchronously covered on the surface of the current collector plate body, so that the center of the winding core and the center of the cover plate can be coaxially aligned. Compared with the prior art, in this embodiment, there is no need to bend the current collector plate, and the cover plate and the housing can be accurately aligned conveniently and quickly, thus avoiding the appearance of defective products caused by the bending process, and greatly improving the production efficiency and product quality of cylindrical batteries;

[0027] (2) The current collector plate assembly disclosed by the present invention does not need to bend the current collector plate, which can improve the space utilization rate of the winding core in the height direction of the cylindrical battery and increase the energy density of the battery; in addition, since the current collector plate does not need to be bent, the battery current collector plate can be continuously increased in the thickness direction to meet the design requirements of large-rate and large-capacity cylindrical batteries, expanding the design space and application range of large cylindrical batteries;

[0028] (3) By arranging a spring piece between the connecting piece and the current collector plate body, the spring piece is sleeved on the connecting column, one end of the spring piece abuts against the connecting piece, and the other end of the spring piece abuts against the current collector plate body. On the premise of satisfying the rotation between the connecting piece and the current collector plate body, the spring piece improves the electrical connection reliability between the connecting piece and the current collector plate body, avoiding poor contact caused by the rotation gap between the connecting piece and the current collector plate, resulting in a decrease in the overcurrent capacity;

[0029] (4) By arranging a welding part at the center of the negative current collector plate and opening a through hole at the center of the bottom surface of the housing, the welding part can pass through the through hole, which is convenient for welding the housing and the welding part, and at the same time convenient for detecting the welding effect;

[0030] (5) Compared with the traditional liquid injection at the eccentric position of the cover plate, by arranging a liquid injection hole at the center of the welding part, the liquid injection is more uniform during liquid injection, and the electrolyte can quickly penetrate from the middle of the winding core into the electrode plate, with a faster liquid injection speed, which is beneficial to improving the liquid injection production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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 following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1Schematic three-dimensional structure diagram of the current collector plate assembly disclosed by the present invention;

[0033] Figure 2 Exploded structure diagram of the current collector plate assembly disclosed by the present invention;

[0034] Figure 3 Schematic first-state structure diagram of the battery cover plate assembly disclosed by the present invention;

[0035] Figure 4 Schematic second-state structure diagram of the battery cover plate assembly disclosed by the present invention;

[0036] Figure 5 Exploded structure diagram of the battery cover plate assembly disclosed by the present invention;

[0037] Figure 6 Schematic plan structure diagram of the battery cover plate assembly disclosed by the present invention;

[0038] Figure 7 Exploded structure diagram of the cylindrical battery disclosed by the present invention;

[0039] Figure 8 Schematic plan structure diagram of the cylindrical battery disclosed by the present invention;

[0040] Reference numerals:

[0041] 1. Current collector plate assembly; 11. Current collector plate body; 111. First connection part; 12. Connection piece; 121. Second connection part; 122. Third connection part; 13. Connection component; 131. First sheet body; 132. Connection column; 133. Second sheet body; 134. Elastic sheet; 2. Battery cover plate assembly; 21. Cover plate; 22. Terminal post; 23. Upper insulating part; 24. Lower insulating part; 25. Riveting part; 26. Sealing part; 3. Cylindrical battery; 31. Shell; 32. Winding core; 33. Negative current collector plate; 331. Welding part; 311. Through hole; 3311. Liquid injection hole; 332. Welding area, 312. Explosion-proof notch. Detailed implementation manners

[0042] Next, in combination with the implementation manners of the present invention, the technical solutions in the implementation manners of the present invention will be clearly and completely described. Obviously, the described implementation manners are only a part of the implementation manners of the present invention, rather than all the implementation manners. Based on the implementation manners in the present invention, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0043] In the prior art, a strip-shaped connecting piece usually extends from one end of the current collector plate, and the end of the connecting piece is fixedly connected to the pole column on the cover plate. After the current collector plate and the end of the winding core are welded, during the process of inserting the winding core into the shell, the connecting piece needs to be folded twice to compress the connecting piece into the shell and make it close to the current collector plate. Since during the folding process of the connecting piece, the bending point must be precise to ensure the accuracy of inserting the battery into the shell. From the perspective of battery manufacturing, there are many points that need to be controlled during bending. If there is a deviation at a certain point, it will cause the cover plate and the shell to be misaligned, resulting in an increase in the defective rate of the bending process.

[0044] To solve the above problems in this embodiment, the adopted solution is to disclose a current collector plate assembly 1, as Figure 1 shown, in combination with Figures 2 - 4 , the current collector plate assembly 1 disclosed in the embodiment of the present invention includes a current collector plate body 11 and a connecting piece 12. The current collector plate body 11 and the connecting piece 12 are two independent components. The current collector plate body 11 is in a disc shape and generally matches the end face contour of the winding core 32. The connecting piece 12 is in a long strip shape.

[0045] One end of the current collector plate body 11 of this embodiment has a first connecting portion 111. Both ends of the connecting piece 12 in the length direction have a second connecting portion 121 and a third connecting portion 122 respectively. The second connecting portion 121 is used for fixedly connecting to the center of the battery cover plate, and the third connecting portion 122 is rotatably connected to the first connecting portion 111. The distance from the center of the current collector plate body 11 to the first connecting portion 111 is equal to the distance from the second connecting portion 121 to the third connecting portion 122.

[0046] Adopting the above technical solution, before welding the current collector plate body 11 and the end of the winding core 32, the third connecting portion 122 on the connecting piece 12 is horizontally rotated relative to the first connecting portion 111 on the current collector plate body 11, so that the connecting piece 12 is located outside the current collector plate body 11. At this time, the cover plate is driven by the connecting piece 12 and moves away from the current collector plate body 11 in the horizontal direction. After the current collector plate body 11 and the winding core 32 are welded coaxially, by horizontally rotating the connecting piece 12 relative to the current collector plate body 11, the cover plate and the connecting piece 12 are synchronously covered on the surface of the current collector plate body 11, which can realize the coaxiality of the center of the winding core 32 and the center of the cover plate. Compared with the prior art, in this embodiment, there is no need to bend the current collector plate, and the accurate alignment of the cover plate and the shell 31 can be conveniently and quickly realized, 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.

[0047] In order to realize the rotational connection between the current collector plate body 11 and the connecting piece 12, a connecting component 13 is provided between the first connecting portion 111 and the second connecting portion 121 in this embodiment.

[0048] This embodiment shows a preferred embodiment of the connecting component 13. Specifically, the connecting component 13 includes a first sheet body 131, a connecting column 132, and a second sheet body 133. The first connecting portion 111 and the second connecting portion 121 are both configured as through holes of the same size, and the through holes are round holes. The connecting column 132 passes through the first connecting portion 111 and the second connecting portion 121. The first sheet body 131 is disposed on the side of the connecting piece 12 away from the current collecting plate body 11, and the first sheet body 131 is fixedly connected to one end of the connecting column 132. The second sheet body 133 is disposed on the side of the current collecting plate body 11 away from the connecting piece 12, and the second sheet body 133 is fixedly connected to the other end of the connecting column 132.

[0049] With this setting, the first connecting portion 111 on the current collecting plate body 11 is sleeved on the connecting column 132, and its outer surface is in contact with the outer surface of the second sheet body 133. The third connecting portion 122 on the connecting piece 12 is sleeved on the connecting column 132, and its outer surface is in contact with the surface of the first sheet body 131. The current collecting plate body 11 and the connecting piece 12 are defined between the first sheet body 131 and the second sheet body 133. The current collecting plate body 11 and the connecting piece 12 can be rotatably connected through the connecting column 132. At the same time, a gap for the rotation of the current collecting plate body 11 and the connecting piece 12 is reserved between the first sheet body 131 and the second sheet body 133. Thus, it can ensure that the current collecting plate body 11 and the connecting piece 12 can be electrically connected and can be rotatably connected.

[0050] Due to the rotation gap between the current collecting plate and the connecting piece 12 body, these gaps will increase their contact internal resistance, resulting in a decrease in the overcurrent capacity. For this reason, the connecting component 13 of this embodiment further includes a spring piece 134 located between the connecting piece 12 and the current collecting plate body 11. The spring piece 134 is sleeved on the connecting column 132. One end of the spring piece 134 abuts against the connecting piece 12, and the other end of the spring piece 134 abuts against the current collecting plate body 11.

[0051] With this setting, through the elastic force of the spring piece 134, the current collecting plate body 11 is pushed towards the second sheet body 133, and the connecting piece 12 is pushed towards the first sheet body 131, so that the current collecting plate body 11 and the second sheet body 133 are closely attached, and the connecting piece 12 and the first sheet body 131 are closely attached. The overcurrent of the current collecting plate body 11 and the connecting piece 12 is realized through the connecting column 132. On the premise of satisfying the rotatability between the connecting piece 12 and the current collecting plate body 11, the electrical connection reliability between the connecting piece 12 and the current collecting plate body 11 is improved through the spring piece 134, avoiding poor contact caused by the rotation gap between the connecting piece 12 and the current collecting plate, resulting in a decrease in the overcurrent capacity.

[0052] The present invention also provides a battery cover assembly 2. Refer to the appendix Figures 3 - 6As shown, it includes a cover plate 21, a terminal post 22 and the current collector plate assembly 1 described above. The terminal post 22 is fixedly arranged at the center of the cover plate 21 and is electrically isolated from the cover plate 21. The connecting piece 12 is fixedly connected to the terminal post 22 through the second connecting portion 121.

[0053] Furthermore, the battery cover plate assembly 2 further includes an upper insulating member 23, a lower insulating member 24 and a riveting member 25. The terminal post 22, the upper insulating member 23, the cover plate 21, the lower insulating member 24 and the connecting piece 12 are sequentially connected through the riveting member 25. In this embodiment, the riveting member 25 passes through the second connecting portion 121 on the connecting piece 12, and then sequentially passes through the lower insulating member 24, the cover plate 21, the upper insulating member 23 to realize riveting with the terminal post 22. In this embodiment, the upper insulating member 23 is used to keep electrical isolation between the terminal post 22 and the cover plate 21, and the lower insulating member is used to ensure electrical isolation between the current collector plate assembly 1 and the cover plate 21. In this embodiment, the second connecting portion 121 is also configured as a through hole.

[0054] In order to achieve insulation between the riveting member 25 and the cover plate 21, the battery cover plate assembly 2 of this embodiment further sets a sealing member 26. The sealing member 26 is arranged between the cover plate 21 and the riveting member 25. On the one hand, it electrically isolates the riveting member 25 and the cover plate 21, and on the other hand, it can seal the cover plate 21 to avoid electrolyte leakage.

[0055] The present invention also provides a cylindrical battery 3. Refer to the attached Figure 7 and 8 As shown, it includes a housing 31, a wound core 32 and the battery cover plate assembly 2 described above. The wound core 32 is arranged in the housing 31. The current collector plate body 11 in the battery cover plate assembly 2 is welded to the positive extreme of the wound core 32, and the cover plate 21 in the battery cover plate assembly 2 is fixedly connected to the open end of the housing 31.

[0056] In the above embodiment, when the housing 31 has openings at both ends, two battery cover plate assemblies 2 can be set. One battery cover plate assembly 2 is welded to the positive extreme of the wound core 32, and the other battery cover plate assembly 2 is welded to the negative extreme of the wound core 32.

[0057] When the housing 31 has an opening at one end, after the wound core 32 is put into the housing, its negative extreme can be laser penetration welded to the bottom surface of the housing 31.

[0058] In order to facilitate the welding of the negative extreme of the wound core 32 and the housing 31, the cylindrical battery 3 of this embodiment further includes a negative current collector plate 33. A welding portion 331 is fixedly arranged at the center of the negative current collector plate 33. A through hole 311 is opened at the center of the bottom surface of the housing 31. The welding portion 331 passes through the through hole 311 and is welded to the housing 31. With this setting, the welding portion 331 passes through the through hole 311, which is convenient for welding the housing 31 and the welding portion 331, and at the same time convenient for detecting the welding effect.

[0059] A liquid injection hole 3311 is provided at the center of the welding part 331. Compared with injecting liquid at an eccentric position of the traditional cover plate 21, by providing the liquid injection hole 3311 at the center of the welding part 331, the liquid injection is more uniform during liquid injection, and the electrolyte can quickly penetrate from the middle of the wound core 32 into the electrode sheet, and the liquid injection speed is faster, which is beneficial to improving the liquid injection production efficiency.

[0060] A plurality of welding areas are provided on the negative current collector plate 33, and the welding areas are arranged at equal intervals around the central axis of the welding part 331. The welding areas are used for welding with the negative end of the wound core 32. With this setting, the area between two adjacent welding areas can facilitate the penetration of the electrolyte.

[0061] In this embodiment, explosion-proof indentations are provided on the bottom surface of the housing 31. With this setting, when the internal pressure of the battery is too high, the explosion-proof indentations can be broken through for pressure relief.

[0062] For the cylindrical battery 3 disclosed in the present invention, because the current collector plate assembly 1 is used, and for the current collector plate assembly 1 disclosed in the present invention, there is no need to bend the current collector plate, the space utilization rate of the wound core 32 can be improved in the height direction of the cylindrical battery 3, and the energy density of the battery can be increased; in addition, because the current collector plate does not need to be bent, the battery current collector plate 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.

[0063] In addition, after the traditional current collector plate is bent, the current collector plate is continuously stressed inside the battery, resulting in stress concentration and causing the risk of battery safety due to the fracture of the current collector plate. At the same time, due to the elastic force acting on the bent part of the current collector plate, the wound core 32 will move axially in the housing 31. However, for the current collector plate assembly 1 and the cover plate disclosed in the present invention, they are tightly connected to form the battery cover plate assembly 2, so there will be no risk of current collector plate fracture, nor will there be a problem of axial movement of the wound core 32 inside the housing 31, thus ensuring the safety and stability of the cylindrical battery 3.

[0064] The present invention also discloses an assembly process for a cylindrical battery, including the following steps:

[0065] S1. The negative end of the flattened wound core 32 is brought into concentric contact with the negative current collector plate 33 and welded, and the positive end of the wound core 32 is brought into concentric contact with the current collector plate body 11 and welded;

[0066] S2. The connecting piece 12 is horizontally rotated relative to the current collector plate body 11, so that the cover plate and the connecting piece 12 are synchronously covered on the surface of the current collector plate body 11, and the center of the wound core 32 and the center of the cover plate are coaxially arranged;

[0067] S3. The wound core 32 is put into the housing, the negative current collector plate 33 is welded to the inner bottom surface of the housing 31, and then the cover plate 21 is welded to the open end of the housing 31.

[0068] As an implementation method, when the housing 31 has openings at both ends, two battery cover assemblies 2 can be provided. The current collector plate body 11 in one battery cover assembly 2 is welded to the positive extreme of the wound core 32, then the wound core 32 is inserted into the housing, and then the current collector plate body in the other battery cover assembly 2 is welded to the negative extreme of the wound core 32. Finally, the cover plates 21 in the two battery cover assemblies 2 are respectively welded to the open ends of the housing to complete the assembly of the cylindrical battery 3.

[0069] As another implementation method, when the housing 31 has an opening at one end, the current collector plate body 11 in the battery cover assembly 2 is welded to the positive extreme of the wound core 32, then the wound core 32 is inserted into the housing, the cover plate 21 in the battery cover assembly 2 is welded to the open end of the housing, and then the negative extreme of the wound core 32 and the bottom surface of the housing 31 are subjected to laser penetration welding to complete the assembly of the cylindrical battery 3.

[0070] As a third implementation method, when the housing 31 has an opening at one end, the current collector plate body 11 in the battery cover assembly 2 is welded to the positive extreme of the wound core 32, the negative extreme of the wound core 32 is welded to the negative current collector plate 33, then the wound core 32 is inserted into the housing, so that the welding part 331 on the negative current collector plate 33 passes through the through hole 311, the welding part 331 and the bottom surface of the housing 31 are welded, and then the cover plate 21 and the open end of the housing 31 are welded. Liquid is injected into the housing 31 through the liquid injection hole 3311 on the welding part 331 to complete the assembly of the cylindrical battery 3.

[0071] The above are only the preferred implementation methods of the present invention and are 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 within the protection scope of the present invention.

Claims

1. A current collector plate assembly, characterized in that, it includes: A current collector plate body (11), one end of the current collector plate body (11) has a first connection part (111); A connecting piece (12), both ends of the connecting piece (12) in the length direction have a second connection part (121) and a third connection part (122) respectively. The second connection part (121) is used for fixed connection with the center of the battery cover plate (21), the third connection part (122) is rotationally connected with the first connection part (111), and the connecting piece (12) can rotate horizontally relative to the current collector plate body (11); The distance from the center of the current collector plate body (11) to the first connection part (111) is equal to the distance from the second connection part (121) to the third connection part (122).

2. The current collector plate assembly according to claim 1, characterized in that: The current collector plate assembly (1) further includes a connection assembly (13) arranged between the first connection part (111) and the second connection part (121), and the connection assembly (13) is used for rotatably connecting the current collector plate body (11) and the connecting piece (12).

3. The current collector plate assembly according to claim 2, characterized in that: The connection assembly (13) includes a first sheet body (131), a connecting column (132) and a second sheet body (133). Both the first connection part (111) and the second connection part (121) are configured as through holes. The connecting column (132) passes through the first connection part (111) and the second connection part (121). The first sheet body (131) is arranged on the side of the connecting piece (12) away from the current collector plate body (11), and the first sheet body (131) is fixedly connected with one end of the connecting column (132). The second sheet body (133) is arranged on the side of the current collector plate body (11) away from the connecting piece (12), and the second sheet body (133) is fixedly connected with the other end of the connecting column (132).

4. The current collector plate assembly according to claim 3, characterized in that: The connection assembly (13) further includes a spring piece (134) located between the connecting piece (12) and the current collector plate body (11). The spring piece (134) is sleeved on the connecting column (132). One end of the spring piece (134) abuts against the connecting piece (12), and the other end of the spring piece (134) abuts against the current collector plate body (11).

5. A battery cover plate assembly includes a cover plate (21), a pole column (22) and the current collector plate assembly (1) according to any one of claims 1 to 4, characterized in that: The pole column (22) is fixedly arranged at the center of the cover plate (21) and is electrically isolated from the cover plate (21). The connecting piece (12) is fixedly connected with the pole column (22) through the second connection part (121).

6. The battery cover plate assembly according to claim 5, characterized in that: It further includes an upper insulating part (23), a lower insulating part (24) and a riveting part (25), and the pole column (22), the upper insulating part (23), the cover plate (21), the lower insulating part (24) and the connecting piece (12) are sequentially connected through the riveting part (25).

7. A cylindrical battery, comprising a housing (31), a wound core (32) and the battery cover plate assembly (2) as described in claim 6, characterized in that: the wound core (32) is arranged in the housing (31), the current collector plate body (11) in the battery cover plate assembly (2) is welded to the positive extreme of the wound core (32), and the cover plate (21) in the battery cover plate assembly (2) is fixedly connected to the open end of the housing (31).

8. The cylindrical battery as described in claim 7, characterized in that: it further includes a negative current collector plate (33), a welding part (331) is fixedly arranged at the center of the negative current collector plate (33), a through hole (311) is formed at the center of the bottom surface of the housing (31), the welding part (331) passes through the through hole (311) and is welded to the housing (31), a liquid injection hole (3311) is formed at the center of the welding part (331), a plurality of welding areas are arranged on the negative current collector plate (33), and the welding areas are arranged at equal intervals around the central axis of the welding part (331), and the welding areas are used for welding to the negative extreme of the wound core (32).

9. The cylindrical battery as described in claim 8, characterized in that: an explosion-proof indentation is arranged on the bottom surface of the housing (31).

10. An assembly process for a cylindrical battery, which utilizes the cylindrical battery (3) as described in claim 8, characterized in that, it includes the following steps: S1. Concentrically contact and weld the negative extreme of the flattened wound core (32) and the negative current collector plate (33), and concentrically contact and weld the positive extreme of the wound core (32) and the current collector plate body (11); S2. Horizontally rotate the connecting piece (12) relative to the current collector plate body (11) so that the cover plate and the connecting piece (12) synchronously cover the surface of the current collector plate body (11), and make the centers of the wound core (32) and the cover plate coaxial; S3. Insert the wound core (32) into the housing, weld the negative current collector plate (33) to the inner bottom surface of the housing (31), and then weld the cover plate (21) to the open end of the housing (31).

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