Cylindrical battery current collector welding clamp and device

Abstract

The invention provides a cylindrical battery current collector welding clamp and device. The welding clamp comprises a machine base plate. The lower frame plate is adjustably assembled on the machine base plate in the longitudinal direction; the pressing head assembly comprises an upper frame plate, a driving plate and a bearing plate, the upper frame plate is installed on the machine base plate, the driving plate is installed on the upper frame plate, the bearing plate is located between the driving plate and the lower frame plate, the bearing plate can be close to or away from the driving plate in the longitudinal direction, an assembling hole is formed in the bearing plate in a penetrating mode, and the multiple pressing blocks are arranged at intervals in the circumferential direction of the assembling hole; the pressing block is provided with a pressing face, and in the radial direction of the assembly hole, the shell and the flanging structure are located between the inner wall of the assembly hole and the pressing face. When the bearing plate gets close to the driving plate in the longitudinal direction, the driving plate can act on the pressing block so that the pressing block can move outwards in the radial direction of the assembling hole, and the flanging structure can be attached to the shell. According to the invention, the gap between the shell and the flanging structure of the current collector can be effectively eliminated, and meanwhile, the clamp can be suitable for clamping cylindrical batteries of different specifications.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a cylindrical battery current collector welding fixture and device. Background Art

[0002] like Figure 11 The figure shows a cylindrical battery a, comprising a housing a1 and a current collector a2, with a flange structure a21 disposed around the periphery of the current collector a2. The current collector a2 is embedded within the housing a1, and the flange structure a21 is attached to the inner wall of the housing a1 and then laser welded to connect the current collector a2 to the housing a1. For ease of assembly, a certain gap is permitted between the flange structure a21 and the inner wall of the housing a1. However, this gap makes it prone to cold welds during subsequent laser welding. Therefore, eliminating this gap between the flange structure a21 and the inner wall of the housing a1 during welding is a pressing issue. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the first object of the present invention is to provide a cylindrical battery current collector welding fixture, which can effectively eliminate the gap between the shell and the flange structure of the current collector, and can be suitable for clamping cylindrical batteries of different specifications.

[0004] The second object of the present invention is to provide a cylindrical battery current collector welding device, which can effectively reduce the possibility of poor welding between the shell and the current collector, thereby ensuring the welding quality of the cylindrical battery.

[0005] The embodiments of the present invention are achieved through the following technical solutions:

[0006] A cylindrical battery collector welding fixture comprises: a machine base plate; a lower frame plate, which is adjustably assembled to the machine base plate in the longitudinal direction, and the lower frame plate can drive the cylindrical battery to move in the longitudinal direction; a pressure head assembly, comprising an upper frame plate, a driving plate and a supporting plate, the upper frame plate is mounted on the machine base plate and is located on the upper side of the lower frame plate in the longitudinal direction, the driving plate is mounted on the upper frame plate, the supporting plate is located between the driving plate and the lower frame plate, the supporting plate can approach or move away from the driving plate in the longitudinal direction, and an assembly hole is provided on the supporting plate for accommodating the cylindrical battery. A plurality of pressure blocks are arranged at circumferential intervals along the assembly hole on the support plate, and the pressure blocks can move radially along the assembly hole. A pressing surface is arranged on the pressure block. In the radial direction of the assembly hole, the shell and the flange structure are located between the inner wall of the assembly hole and the pressing surface. A lifting surface is arranged on the support plate, and the lifting surface is located on the path of the longitudinal movement of the cylindrical battery; when the support plate approaches the drive plate in the longitudinal direction, the drive plate can act on the pressure block to make the pressure block move radially outward along the assembly hole, so that the flange structure fits to the shell. In this arrangement, by driving the cylindrical battery to move upward in the longitudinal direction and lift the supporting plate, the driving plate acts on the pressing block to make the pressing block move outward in the radial direction of the assembly hole until the pressing surface abuts against the flange structure and presses it tightly to the inner wall of the shell. In this way, the gap between the flange structure and the inner wall of the shell can be eliminated, and the possibility of cold welding between the collector and the shell can be reduced; at the same time, the pressing block can move within a certain size range in the radial direction of the assembly hole, so the cylindrical battery collector welding fixture can be suitable for welding cylindrical batteries of different specifications.

[0007] According to a preferred embodiment, a first reset member is arranged on the supporting plate, and the first reset member acts on the pressure head so that the pressure head has a tendency to move radially inward along the assembly hole.

[0008] According to a preferred embodiment, the driving plate and the supporting plate are provided with a second reset member, and the second reset member acts on the supporting plate so that the supporting plate has a tendency to move away from the driving plate in the longitudinal direction.

[0009] According to a preferred embodiment, a lifting block is arranged on the supporting plate, the lifting block extends radially inwardly along the assembly hole, and the lifting surface is arranged on the lower side of the lifting block.

[0010] According to a preferred embodiment, a limiting block is arranged on the supporting plate, and a limiting surface is arranged on the limiting block along the longitudinal direction toward the end of the lower shelf plate. The shell and the flange structure are located between the limiting block and the inner wall of the assembly hole. In the longitudinal direction, the limiting surface is lower than the lifting surface.

[0011] According to a preferred embodiment, a guide groove is provided on the side of the support plate facing the driving plate, and the pressure block is slidably embedded in the guide groove; a pressure plate is arranged on the support plate, and the pressure plate at least partially extends above the guide groove, for limiting the pressure block in the longitudinal direction.

[0012] According to a preferred embodiment, the pressing block includes a main body, an end of the main body facing the center of the assembly hole is provided with a pressing portion, and the pressing surface is provided on the pressing portion.

[0013] According to a preferred embodiment, a first driving inclined surface is arranged on the driving plate, and a second driving inclined surface is arranged on the pressing block; when the supporting plate approaches the driving plate in the longitudinal direction, the first driving inclined surface can act on the second driving inclined surface to make the pressing block move radially outward along the assembly hole.

[0014] According to a preferred embodiment, a guide pin is arranged on the driving plate, and the guide pin passes through the supporting plate and is slidably connected thereto; the driving plate is rotatably connected to the upper shelf plate; a driving shaft is rotatably mounted on the lower shelf plate, and a flange plate is arranged on one end of the driving shaft facing the driving plate, and the cylindrical battery is assembled on the flange plate; a guide shaft is assembled on the supporting plate, and the guide shaft passes through the flange plate and is slidably connected thereto, and the guide shaft is parallel to the driving shaft, and both are arranged to extend longitudinally.

[0015] A cylindrical battery current collector welding device includes a laser and the aforementioned cylindrical battery current collector welding fixture. The laser is used to provide the laser beam required for welding cylindrical batteries. This welding device can effectively weld the current collector to the housing, reducing the possibility of cold welds and ensuring the welding quality of cylindrical batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic diagram of a first three-dimensional structure of a welding fixture provided in an embodiment of the present invention;

[0018] Figure 2 A second three-dimensional structural diagram of a welding fixture provided in an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the front structure of the welding fixture provided by an embodiment of the present invention with the base plate removed;

[0020] Figure 4 A schematic cross-sectional view of the assembly of a pressing head assembly and a cylindrical battery according to an embodiment of the present invention;

[0021] Figure 5 for Figure 4 A partial enlarged schematic diagram of the structure at point A in the middle;

[0022] Figure 6 A schematic diagram of the exploded structure of a pressing head assembly provided in an embodiment of the present invention;

[0023] Figure 7 A schematic diagram of the three-dimensional structure of a support plate provided in an embodiment of the present invention;

[0024] Figure 8 A schematic cross-sectional view of a support plate provided in an embodiment of the present invention;

[0025] Figure 9 A schematic diagram of the three-dimensional structure of a pressing block provided in an embodiment of the present invention;

[0026] Figure 10 A schematic diagram of the three-dimensional structure of a welding device provided in an embodiment of the present invention;

[0027] Figure 11 Schematic diagram of the structure of a cylindrical battery in an embodiment of the present invention.

[0028] Icons: 1. Machine base plate; 11. Avoidance hole; 2. Lower frame plate; 21. Driving shaft; 22. Flange plate; 23. Three-claw cylinder; 3. Press head assembly; 30. Cross roller bearing; 31. Upper frame plate; 32. Drive plate; 321. Drive hole; 322. First drive inclined surface; 323. Guide pin shaft; 324. Second reset member; 33. Support plate; 330. Main body; 3301. Boss; 3302. Lifting block; 3303. Limit block; 33031. Limiting surface; 331. Assembly hole; 332. Top Lifting surface; 333, guide groove; 334, guide shaft; 34, pressure block; 341, main body; 342, pressing part; 3421, pressing surface; 343, driving part; 3431, second driving inclined surface; 344, sliding part; 35, first reset member; 36, pressure plate; 37, upper pressure ring; 38, lower pressure ring; 4, first synchronous belt; 5, second synchronous belt; 6, transmission screw; a, cylindrical battery; a1, shell; a2, current collector; a21, flanging structure; a3, winding core; b, laser beam; X, longitudinal direction. DETAILED DESCRIPTION

[0029] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0032] Please refer to Figures 1 to 9 A cylindrical battery collector welding fixture includes a machine base plate 1, a lower frame plate 2 and a pressure head assembly 3, wherein the lower frame plate 2 is adjustably assembled to the machine base plate 1 along the longitudinal direction X, and the lower frame plate 2 can drive the cylindrical battery a to move along the longitudinal direction X; the pressure head assembly 3 includes an upper frame plate 31, a driving plate 32 and a supporting plate 33, the upper frame plate 31 is mounted on the machine base plate 1, and is on the upper side of the lower frame plate 2 in the longitudinal direction X, the driving plate 32 is mounted on the upper frame plate 31, and the supporting plate 33 is between the driving plate 32 and the lower frame plate 2, and the supporting plate 33 can approach or move away from the driving plate 32 along the longitudinal direction X. The supporting plate 33 is provided with an assembly hole 331 for accommodating the cylindrical battery a, and the supporting plate 33 is provided with a mounting hole 331 for accommodating the cylindrical battery a. A plurality of pressing blocks 34 are arranged at intervals along the circumference of the assembly hole 331. The pressing blocks 34 can move radially along the assembly hole 331. A pressing surface 3421 is provided on the pressing block 34. In the radial direction of the assembly hole 331, the flange structure a21 of the shell a1 and the current collector a2 is located between the inner wall of the assembly hole 331 and the pressing surface 3421. A lifting surface 332 is provided on the supporting plate 33. The lifting surface 332 is located on the path of the cylindrical battery a moving along the longitudinal direction X. When the supporting plate 33 approaches the driving plate 32 along the longitudinal direction X, the driving plate 32 can act on the pressing block 34 to make the pressing block 34 move radially outward along the assembly hole 331, so that the flange structure a21 fits the shell a1. Figures 1 to 3 As shown, a three-claw cylinder 23 is mounted on the lower shelf plate 2, and the cylindrical battery a is mounted on the lower shelf plate 2 through the three-claw cylinder 23. Preferably, the assembly hole 331 is coaxial with the cylindrical battery a.

[0033] like Figures 4 to 6As shown, when in use, the lower shelf plate 2 moves upward along the longitudinal direction X. During this process, the cylindrical battery a moves upward synchronously with the lower shelf plate 2 along the longitudinal direction X, that is, the cylindrical battery a moves toward the support plate 33 until the cylindrical battery a abuts the lifting surface 332; then the cylindrical battery a continues to move upward along the longitudinal direction X under the action of the lower shelf plate 2. During this process, the driving plate 32 acts on the pressing block 34 to make the pressing block 34 move outward along the radial direction of the assembly hole 331 until the pressing surface 3421 abuts the flange structure a21 and presses it tightly to the inner wall of the shell a1. This can eliminate the gap between the flange structure a21 and the inner wall of the shell a1, reducing the possibility of a cold weld when welding the current collector a2 to the shell a1; at the same time, the pressing block 34 can move within a certain size range in the radial direction of the assembly hole 331, so the cylindrical battery current collector welding fixture can be used for welding cylindrical batteries a of different specifications. It should be noted that the weld is located between two adjacent pressing blocks 34. When the pressing surface 3421 presses the flange structure a21 , the flange structure a21 can be deformed toward the inner wall of the shell a1 .

[0034] like Figure 4 As shown, a first reset member 35 is disposed on the support plate 33. The first reset member 35 acts on the pressing head to cause the pressing head to move radially inward along the assembly hole 331. With this arrangement, after the cylindrical battery a is welded, the first reset member 35 acts on the pressing head to facilitate rapid reset. Optionally, the first reset member 35 is a spring.

[0035] Furthermore, if Figure 4 and Figure 7 As shown, a guide slot 333 is provided on the side of the support plate 33 facing the drive plate 32, and the pressure block 34 is slidably embedded in the guide slot 333; a pressure plate 36 is provided on the support plate 33, and the pressure plate 36 at least partially extends above the guide slot 333 to limit the pressure block 34 in the longitudinal direction X. In this embodiment, the pressure plate 36 is detachably mounted to the support plate 33 by screws or bolts. Here, the pressure plate 36 is used to limit the pressure block 34 to prevent it from escaping from the guide slot 333. It should be noted that the guide slot 333 extends radially along the assembly hole 331, and the pressure block 34, under the limiting action of the groove wall of the guide slot 333, achieves stability in the radial motion path along the assembly hole 331.

[0036] like Figure 4 and Figure 6 As shown, preferably, multiple pressure blocks 34 are evenly distributed in the circumferential direction of the assembly hole 331, and the pressure plate 36 is arranged between two adjacent blocks to achieve the purpose of simultaneously limiting the two adjacent pressure blocks 34 with the same pressure plate 36. The structure is compact and easy to maintain.

[0037] like Figure 7 and Figure 8As shown, the support plate 33 includes a main plate body 330. The main plate body 330 is circular, and an assembly hole 331 is provided at the center of the main plate body 330. In order to reduce the longitudinal dimension X of the assembly structure of the support plate 33, the pressure block 34, and the pressure plate 36, in this embodiment, a plurality of bosses 3301 are provided on the side of the main plate body 330 facing the drive plate 32. The bosses 3301 are provided in a one-to-one correspondence with the pressure blocks 34. Guide slots 333 are provided on the bosses 3301. The pressure plate 36 is assembled in the gap between two adjacent bosses 3301, and the portion of the pressure plate 36 adjacent to the bosses 3301 extends beyond the bosses 3301 and above the guide slots 333.

[0038] Furthermore, a lifting block 3302 is disposed on the boss 3301. The lifting block 3302 extends radially inwardly of the assembly hole 331. The lifting surface 332 is disposed on the lower side of the lifting block 3302. In another embodiment, the lifting block 3302 may also be disposed on the main body 330.

[0039] In this embodiment, Figure 4 、 Figure 5 and Figure 8 As shown, a limit block 3303 is configured at the end of the lifting block 3302 toward the center of the assembly hole 331. A limit surface 33031 is configured at the end of the limit block 3303 toward the lower frame plate 2 along the longitudinal direction X. The housing a1 and the flange structure a21 are located between the limit block 3303 and the inner wall of the assembly hole 331. In the longitudinal direction X, the limit surface 33031 is lower than the lifting surface 332. During use, the cylindrical battery a moves upward along the longitudinal direction X, the current collector a2 abuts the limit surface 33031, and the housing a1 abuts the lifting surface 332. Specifically, during the upward movement of the cylindrical battery a along the longitudinal direction X, the current collector a2 first abuts against the limiting surface 33031. The limiting surface 33031 acts on the current collector a2 to compress the winding core a3 in the shell a1 until the shell a1 abuts against the lifting surface 332, thereby ensuring that the height difference between the current collector a2 and the top of the shell a1 is consistent. Then, the pressing surface 3421 acts on the flange structure a21 to make it fit to the inner wall of the shell a1. In this process, the limiting surface 33031 always acts on the current collector a2, which can effectively prevent the current collector a2 from being deformed or displaced due to the deformation of the flange structure a21, thereby ensuring the battery accuracy. Of course, in other embodiments, the limiting block 3303 can also be set at other positions of the main body 330, so as to be able to play the above-mentioned role on the current collector a2.

[0040] like Figure 4 、 Figure 5 and Figure 9As shown, the pressing block 34 includes a main body 341, with a pressing portion 342 disposed at one end of the main body 341 facing the center of the assembly hole 331. A pressing surface 3421 is provided on the pressing portion 342. It should be noted that in the longitudinal direction X, the lower end surface of the pressing portion 342 is higher than the limiting surface 33031. This arrangement ensures a gap between the lower end surface of the pressing portion 342 and the current collector a2, ensuring that the limiting effect of the limiting surface 33031 on the current collector a2 is not lost.

[0041] like Figure 6 As shown, the drive plate 32 is provided with a guide pin 323, which extends through the support plate 33 and is slidably connected thereto. In this embodiment, the guide pin 323 optionally extends through the pressure plate 36 and the support plate 33 in sequence. Preferably, the guide pin 323 is a tapping screw that is threadedly connected to the drive plate 32, thereby enabling the support plate 33 to be assembled and connected to the drive plate 32 in the longitudinal direction X. Furthermore, the drive plate 32 and the support plate 33 are provided with a second reset member 324, which acts on the support plate 33 to force the support plate 33 to move away from the drive plate 32 in the longitudinal direction X. Preferably, the second reset member 324 is a spring, which is sleeved outside the guide pin shaft 323. During use, when the support plate 33 moves upward along the longitudinal direction X under the action of the cylindrical battery a, the support plate 33 and the drive plate 32 jointly act on the second reset member 324, that is, the spring, to compress it and store energy. When welding is completed, the second reset member 324 facilitates the reset of the support plate 33.

[0042] like Figure 4 and Figure 9 As shown, the drive plate 32 is provided with a first drive bevel 322, and the pressure block 34 is provided with a second drive bevel 3431. When the support plate 33 approaches the drive plate 32 along the longitudinal direction X, the first drive bevel 322 can act on the second drive bevel 3431, causing the pressure block 34 to move radially outward along the assembly hole 331. Specifically, the pressure block 34 also includes a drive portion 343 and a sliding portion 344 disposed on the main body 341. The drive portion 343 is disposed near the drive plate 32, and the sliding portion 344 is disposed near the support plate 33. Specifically, a drive hole 321 corresponding to the pressure block 34 is provided through the drive plate 32. The first drive bevel 322 is disposed on the wall of the drive hole 321. The drive portion 343 can be embedded in the drive hole 321. The sliding portion 344 is slidably embedded in the guide groove 333.

[0043] In this embodiment, in order to facilitate welding, the drive plate 32 and the upper frame plate 31 are rotatably connected through a cross roller bearing 30. Specifically, Figure 4 and Figure 6As shown, the pressure head assembly 3 also includes an upper pressure ring 37 and a lower pressure ring 38. The upper pressure ring 37 is fixedly assembled on the upper frame plate 31 by screws or bolts, and is used to cooperate with the upper frame plate 31 to fix the outer ring of the cross roller bearing 30. The lower pressure ring 38 is assembled on the drive plate 32 by screws or bolts to clamp the drive plate 32 to the inner ring of the cross roller bearing 30.

[0044] More specifically, if Figure 3 As shown, a driving shaft 21 is rotatably mounted on the lower frame plate 2 through a bearing, and a flange plate 22 is provided at one end of the driving shaft 21 facing the drive plate 32, and a three-claw cylinder 23 is mounted on the flange plate 22. Of course, in other embodiments, other structures capable of clamping cylindrical batteries a can be assembled on the flange plate 22, such as a battery clamp in the prior art, and are not limited to the three-claw cylinder 23 in this embodiment. Furthermore, a guide shaft 334 is assembled on the supporting plate 33, and the guide shaft 334 passes through the flange plate 22 and is slidably connected thereto. The guide shaft 334 is parallel to the driving shaft 21, and both are extended along the longitudinal direction X. When in use, the driving shaft 21 is driven to rotate by the first synchronous belt 4, so that the cylindrical battery a, the supporting plate 33 and the drive plate 32 can be rotated synchronously.

[0045] like Figure 1 and Figure 2 As shown, a transmission screw 6 is rotatably mounted on the base plate 1 and extends in the longitudinal direction X. The lower frame plate 2 is threadedly connected to the transmission screw 6, and the lower frame plate 2 is slidably connected to the base plate 1 in the longitudinal direction X via a slide rail and slider assembly. In this embodiment, the transmission screw 6 is driven to rotate by a second synchronous belt 5 to drive the lower frame plate 2 to move in the longitudinal direction X, so that the cylindrical battery a can move in the longitudinal direction X.

[0046] In this embodiment, the three-jaw cylinder 23 is disposed on a first side of the base plate 1, and the transmission screw 6 is disposed on the other side of the base plate 1, that is, the base plate 1 is located between the transmission screw 6 and the three-jaw cylinder 23. The base plate 1 is provided with an escape hole 11, through which the lower frame plate 2 is connected to the transmission screw 6. This arrangement can prevent interference between the transmission screw 6 and the lower frame plate 2.

[0047] In another embodiment, the lower frame plate 2 can also be driven by a cylinder or a linear module provided on the machine base plate 1 .

[0048] like Figure 10As shown, this embodiment also provides a cylindrical battery current collector welding device, including a laser (not shown) and the aforementioned cylindrical battery current collector welding fixture. The laser is used to provide the laser beam b required for welding cylindrical battery a. Based on the aforementioned cylindrical battery current collector welding fixture, the cylindrical battery current collector welding device can effectively weld the current collector a2 to the housing a1, reducing the possibility of cold welding and ensuring the welding quality of cylindrical battery a.

[0049] The technical means disclosed in the solutions of the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A cylindrical battery current collector welding fixture, characterized in that: include: Machine base plate; A lower frame plate is adjustably mounted on the base plate in the longitudinal direction, and the lower frame plate is capable of driving the cylindrical battery to move in the longitudinal direction; The pressing head assembly comprises an upper frame plate, a driving plate and a supporting plate, wherein the upper frame plate is mounted on the machine base plate and is located on the upper side of the lower frame plate in the longitudinal direction, the driving plate is mounted on the upper frame plate, the supporting plate is located between the driving plate and the lower frame plate, the supporting plate can approach or move away from the driving plate in the longitudinal direction, an assembly hole is provided on the supporting plate for accommodating the cylindrical battery, a plurality of pressing blocks are provided on the supporting plate at intervals along the circumference of the assembly hole, the pressing blocks can move radially along the assembly hole, a pressing surface is provided on the pressing block, in the radial direction of the assembly hole, the shell and the flanging structure are located between the inner wall of the assembly hole and the pressing surface, a lifting surface is provided on the supporting plate, and the lifting surface is located on the path of the cylindrical battery moving in the longitudinal direction; When the supporting plate approaches the driving plate in the longitudinal direction, the driving plate can act on the pressing block to make the pressing block move radially outward along the assembly hole, so that the flange structure fits to the shell.

2. The cylindrical battery current collector welding fixture according to claim 1, characterized in that: The supporting plate is provided with a first resetting member, which acts on the pressing head so that the pressing head has a tendency to move radially inward along the assembly hole.

3. The cylindrical battery current collector welding fixture according to claim 1, characterized in that: The driving plate and the supporting plate are provided with a second restoring member, and the second restoring member acts on the supporting plate so that the supporting plate has a tendency to move away from the driving plate in the longitudinal direction.

4. The cylindrical battery current collector welding fixture according to claim 1, characterized in that: The supporting plate is provided with a lifting block, which extends radially inwardly along the assembling hole, and the lifting surface is provided on the lower side of the lifting block.

5. The cylindrical battery current collector welding fixture according to claim 1, characterized in that: A limiting block is arranged on the supporting plate, and a limiting surface is arranged on the limiting block along the longitudinal direction toward the end of the lower shelf plate. The shell and the flange structure are located between the limiting block and the inner wall of the assembly hole. In the longitudinal direction, the limiting surface is lower than the lifting surface.

6. The cylindrical battery current collector welding fixture according to claim 1 or 2, characterized in that: A guide slot is provided on the side of the supporting plate facing the driving plate, and the pressing block is slidably embedded in the guide slot; The support plate is provided with a pressure plate, and the pressure plate at least partially extends above the guide slot to limit the pressure block in the longitudinal direction.

7. The cylindrical battery current collector welding fixture according to claim 1, characterized in that: The pressing block includes a main body, an end of the main body facing the center of the assembly hole is provided with a pressing portion, and the pressing surface is provided on the pressing portion.

8. The cylindrical battery current collector welding fixture according to claim 1, characterized in that: The driving plate is provided with a first driving inclined surface, and the pressing block is provided with a second driving inclined surface; When the supporting plate approaches the driving plate in the longitudinal direction, the first driving inclined surface can act on the second driving inclined surface to make the pressing block move outward in the radial direction of the assembly hole.

9. The cylindrical battery current collector welding fixture according to claim 1, characterized in that: The driving plate is provided with a guide pin shaft, and the guide pin shaft passes through the supporting plate and is slidably connected thereto; The driving plate is rotatably connected to the upper frame plate; A driving shaft is rotatably mounted on the lower frame plate, and a flange plate is configured at one end of the driving shaft facing the driving plate, and the cylindrical battery is assembled on the flange plate; A guide shaft is mounted on the supporting plate. The guide shaft passes through the flange plate and is slidably connected thereto. The guide shaft is parallel to the driving shaft, and both extend longitudinally.

10. A cylindrical battery current collector welding device, characterized in that: The invention comprises a laser and a cylindrical battery current collector welding fixture as claimed in any one of claims 1 to 9, wherein the laser is used to provide a laser beam required for welding cylindrical batteries.

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