Lithium battery current collecting post welding device

Abstract

The application discloses a lithium battery current collecting post welding device and belongs to the field of lithium battery production.The device comprises a welding table and a double-shaft movement platform arranged on the welding table, a Z-axis adjusting assembly is fixedly connected to the moving end of the double-shaft movement platform, and a welding assembly is fixedly connected to the moving end of the Z-axis adjusting assembly.The welding assembly comprises a shell fixed to one side of the moving end of the Z-axis adjusting assembly, a movable groove arranged in the shell, a sliding seat slidably arranged in the movable groove and a spring arranged in the movable groove.The resistance welding head applies a force to the workpiece to compress the spring.The pre-compressed spring is a physical energy storage device, which can generate displacement at the moment when the supporting force disappears (metal is melted), and can ensure that effective contact pressure is maintained at the moment when the metal is melted.The scheme can make only the end of the resistance welding head displace when the collapse occurs, and smaller movement quality can generate great acceleration under the same elastic force, and the following capacity of the device for the fast collapse of the current collecting post is obviously improved.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production, and more specifically, to a lithium battery current collector welding device. Background Technology

[0002] Lithium-ion battery current collector welding (also known as electrode welding) is one of the core processes in lithium-ion battery cell manufacturing and module assembly. Its main function is to collect the current generated inside the cell through the tabs to the current collector, and then lead it out to the outside of the battery through the current collector.

[0003] Although laser welding is currently the mainstream method in mass production lines for power batteries, resistance welding still plays an important role in certain types of cells (such as cylindrical batteries or small power batteries) or specific internal connection links.

[0004] In resistance welding of lithium battery current collectors, metal melting occurs within milliseconds. Traditional cylinders or large-mass servo mechanisms, due to their excessive mechanical inertia, cannot keep up with the moment of melting and collapse, leading to a sudden drop in contact pressure and resulting in spatter or arcing. To address this issue, existing technology (utility model patent CN220407402U) discloses a resistance welding device with closed-loop pressure regulation. This device collects the real-time contact resistance at the welding position, uses a controller to perform PID calculations, and then controls the action of a linear drive mechanism (cylinder or linear module) to regulate the pressure. However, this solution suffers from electronic delay. When the rate of metal melting and collapse exceeds the duration of the entire electronic feedback loop, even if the system detects an abnormal resistance and begins to regulate the pressure, the metal collapse may have already been completed, and spatter has already occurred. It cannot achieve the effect of instantaneous collapse tracking, and spatter or arcing still occurs during welding. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a welding device for lithium battery current collectors.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A welding device for lithium battery current collectors includes a welding table and a dual-axis motion platform disposed on the welding table. A Z-axis adjustment component is fixedly connected to the moving end of the dual-axis motion platform, and a welding component is fixedly connected to the moving end of the Z-axis adjustment component.

[0008] The welding assembly includes a housing fixed to one side of the moving end of the Z-axis adjustment assembly, a movable groove opened inside the housing, a slide block slidably connected in the movable groove, a spring located in the movable groove, and a first guide post fixed to the lower end of the slide block. The other end of the first guide post penetrates the housing downward and extends outward, and a resistance welding head is fixedly connected to the extended end of the first guide post. The two ends of the spring are respectively connected to the inner wall of the movable groove and the slide block.

[0009] When the resistance welding head presses on the workpiece and applies pressure to it, the spring is compressed by applying a force to the workpiece. When the workpiece melts, the supporting force of the workpiece on the resistance welding head disappears, and the spring generates a force to drive the slide and the resistance welding head to move, so that the resistance welding head and the workpiece maintain effective contact pressure at the moment the metal melts.

[0010] Furthermore, a second guide post is fixedly connected to the inner wall of the movable groove, and the slide block is slidably sleeved on the outside of the second guide post.

[0011] Furthermore, the movable slot is also provided with an overrush buffer assembly, which includes two sets of mounting plates that slide in the movable slot, a permanent magnet part fixed to one side of the mounting plate, and a conductive induction plate fixed to the outside of the slide block. The magnetic pole surface of the permanent magnet part is arranged facing the plane where the conductive induction plate is located, and the sliding trajectory of the conductive induction plate is located within the magnetic field range of the permanent magnet part.

[0012] Furthermore, an air gap is left between the conductive sensing plate and the permanent magnet part, and the extension direction of the conductive sensing plate is parallel to the displacement direction of the slide; the conductive sensing plate has an area covering part or all of the air gap, so that when the slide moves downward under the drive of the spring, a relative displacement is generated between the conductive sensing plate and the permanent magnet part and cuts the magnetic field lines.

[0013] Furthermore, the conductive sensing plate includes two upper and lower first damping sections fixed to the outside of the slide, two follower adjustment sections and a second damping section fixed to the outside of the slide and located between the upper and lower first damping sections, wherein the second damping section is located between the two follower adjustment sections and fixed to the outside of the slide.

[0014] Furthermore, openings are provided on one side of the first damping section, the follow-up adjustment section, and the second damping section.

[0015] Furthermore, the follow-up adjustment section and the second damping section are geometric drag reduction structures with a gradient distribution along the direction of movement of the resistance welding head. The geometric drag reduction structure dynamically reduces the damping force during the follow-up process as the displacement increases by changing the effective induction area or equivalent resistance of the conductive induction plate in the magnetic field.

[0016] Furthermore, it also includes two active tuning components, which are respectively connected to two sets of mounting plates; the active tuning components include multiple guide rods fixed to the inner wall of the movable groove, a bidirectional lead screw rotatably connected to the inner wall of the movable groove, and multiple extensions integrally formed on the two sets of mounting plates, one of which is screwed to the outside of the bidirectional lead screw, and the remaining extensions are respectively movably sleeved on the outside of the multiple guide rods; two adjustment parts are rotatably connected to the outside of the housing, and the two adjustment parts are respectively connected to the two bidirectional lead screws.

[0017] Furthermore, a compression seat is slidably connected in the movable groove, and the compression seat is located above the spring. A cylinder is fixedly connected to the upper end of the housing, and the telescopic end of the cylinder passes through the housing and enters the movable groove and is fixedly connected to the compression seat. The two ends of the spring are respectively connected to the compression seat and the sliding seat.

[0018] Furthermore, the cylinder drives the compression seat to move in the movable groove, actively compressing the spring and compressing it to the target pressure, so that the spring is already in the target pressure state the moment the resistance welding head contacts the workpiece.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) This scheme adopts a combination of servo adjustment and spring preload. The Z-axis adjustment component drives the entire welding assembly to move and enables the welding assembly to press on the workpiece to be welded. The resistance welding head applies force to the workpiece to compress the spring. The preload spring is a physical energy storage, and its release speed is limited by the mechanical wave speed of the material, which is close to the microsecond level. It does not go through any electronic processing logic and generates displacement at the moment the support force disappears (metal melts), which can ensure that effective contact pressure is always maintained at the moment the metal melts. This scheme makes only the end of the resistance welding head displace when collapse occurs. The smaller moving mass can generate a large acceleration under the same elastic force, which significantly improves the ability to follow up the rapid collapse of the current collector column.

[0021] (2) This scheme is equipped with an over-rush buffer component. A conductive induction plate is fixed on the side wall of the slide and a permanent magnet is installed on the inner wall of the movable groove. The permanent magnet can create a strong single-sided magnetic field on one side of the conductive induction plate. When melting and collapse occur, the resistance welding head moves downward at high speed with the slide and the conductive induction plate. The conductive induction plate cuts the strong magnetic field and generates eddy currents inside. The eddy currents themselves generate a reverse magnetic field, which interacts with the original magnetic field to generate a damping force proportional to the movement speed. The eddy current damping force is the largest when the following speed is the highest (when the collapse is the fastest). As the resistance welding head gradually stops, the damping force disappears automatically. This allows the energy of the spring to be released in a controlled manner, suppressing oscillation and rebound. It avoids the energy released by the spring at the moment the metal collapses and stops, which may cause the welding head to violently hit the bottom of the workpiece or generate rebound.

[0022] (3) The conductive induction plate of this scheme adopts a three-section design. The upper and lower first damping sections both adopt high-purity, ultra-thick copper block structures. The lower first damping section is configured to couple with the permanent magnet to generate maximum feedback damping force during the initial pressing stage when the follower resistance welding head contacts the workpiece, so as to suppress the oscillation of the resistance welding head. The upper first damping section has a higher damping induction intensity per unit area than the end of the middle follower adjustment section. It is configured to provide instantaneous braking damping at the end of the collapse to absorb the follower residual kinetic energy and prevent the welding head from hitting the bottom. The follower adjustment section and the second damping section constitute the middle gradient adjustment area (thickness change + gradient opening). Its effective conductive area and thickness gradually decrease with displacement, forming a dynamically tuned damping gradient. When collapse occurs, the resistance welding head descends at high speed, and the conductive induction plate passes through the magnet area. As the displacement increases, the damping force decreases automatically and smoothly. This prevents excessive damping force from being generated in the middle of the follow-up process, ensures that the spring energy can be used for acceleration, makes the entire follow-up process smoother and without lag, and avoids the rebound situation.

[0023] (4) This solution is equipped with an active tuning component. The distance between the conductive induction plate and the permanent magnet can be adjusted through the active tuning component, thereby providing customized damping curves for materials with different collapse rates without changing the hardware. Furthermore, by adjusting the distance between the conductive induction plate and the permanent magnet, it can also be used as a compensation adjustment. When the conductive induction plate heats up (causing the damping to weaken), the air gap is adjusted and reduced, and the loss of physical performance is compensated by geometric gain. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the welding assembly structure of the present invention;

[0026] Figure 3 This is a cross-sectional view of the welding assembly of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the welding assembly of the present invention after the shell is removed;

[0028] Figure 5 This is a schematic diagram of the overshoot buffer assembly and active tuning assembly of the present invention;

[0029] Figure 6 This is a schematic diagram showing the positional relationship between the conductive sensing plate and the slide block of the present invention;

[0030] Figure 7 This is a schematic diagram of the conductive induction plate structure of the present invention.

[0031] Explanation of the labels in the diagram:

[0032] 1. Welding table; 2. Dual-axis motion platform; 3. Z-axis adjustment assembly; 4. Welding assembly; 41. Housing; 42. Slide; 43. First guide post; 44. Resistance welding head; 45. Movable groove; 46. Second guide post; 47. Spring; 48. Cylinder; 49. Compression seat; 5. Overshoot buffer assembly; 51. Mounting plate; 52. Permanent magnet section; 53. Conductive induction plate; 531. First damping section; 532. Follow-up adjustment section; 533. Second damping section; 534. Opening; 6. Active tuning assembly; 61. Extension section; 62. Guide rod; 63. Bidirectional lead screw; 64. Adjustment section. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1 to 7 A welding device for lithium battery current collectors includes a welding table 1 and a dual-axis motion platform 2 disposed on the welding table 1. A Z-axis adjustment component 3 is fixedly connected to the moving end of the dual-axis motion platform 2, and a welding component 4 is fixedly connected to the moving end of the Z-axis adjustment component 3.

[0035] The welding assembly 4 includes a housing 41 fixed to one side of the moving end of the Z-axis adjustment assembly 3, a movable groove 45 opened inside the housing 41, a slide block 42 slidably connected in the movable groove 45, a spring 47 located in the movable groove 45, and a first guide post 43 fixed to the lower end of the slide block 42. The other end of the first guide post 43 penetrates the housing 41 downward and extends outward, and a resistance welding head 44 is fixedly connected to the extended end of the first guide post 43. The two ends of the spring 47 are respectively connected to the inner wall of the movable groove 45 and the slide block 42.

[0036] The inner wall of the movable groove 45 is also fixedly connected to a second guide post 46, and the slide block 42 is slidably sleeved on the outside of the second guide post 46.

[0037] A compression seat 49 is also slidably connected in the movable groove 45, and the compression seat 49 is located above the spring 47. A cylinder 48 is fixedly connected to the upper end of the housing 41, and the telescopic end of the cylinder 48 passes through the housing 41 and enters the movable groove 45 and is fixedly connected to the compression seat 49. The two ends of the spring 47 are respectively connected to the compression seat 49 and the slide 42. The cylinder 48 drives the compression seat 49 to move in the movable groove 45, actively compressing the spring 47 and compressing the spring 47 to the target pressure, so that the spring 47 is already in the target pressure state the moment the resistance welding head 44 contacts the workpiece.

[0038] By adopting the above technical solution, both the dual-axis motion platform 2 and the Z-axis adjustment component 3 are mature existing technologies, generally composed of servo motors, lead screws, sliding sleeves, etc. Axial movement is achieved by moving the sliding sleeve through the lead screw, which will not be elaborated here. The dual-axis motion platform 2 can drive the Z-axis adjustment component 3 and the welding component 4 to move in the XY axes. The Z-axis adjustment component 3 can drive the welding component 4 to move in the Z-axis. After the workpiece to be welded is placed on the welding table 1 and positioned, the position of the welding component 4 in the XY axes is adjusted by the dual-axis motion platform 2, so that the welding component 4 moves above the welding point of the workpiece. The welding component 4 is driven to descend by the Z-axis adjustment component 3, so that the resistance welding head 44 contacts the workpiece. It should be noted that a pressure sensor can be installed at the connection between the second guide post 46 and the slide 42 to monitor the pressure applied to the workpiece by the resistance welding head 44.

[0039] After the resistance welding head 44 contacts the workpiece, the Z-axis adjusting assembly 3 continues to move the housing 41 downwards, causing the resistance welding head 44 to press against the workpiece and continue to apply pressure. At this time, the resistance welding head 44 applies a force to the spring 47 through the second guide post 46 and the slide 42, compressing the spring 47 in the movable groove 45. When the resistance welding head 44 works to weld the workpiece and the workpiece melts, the supporting force of the workpiece on the resistance welding head 44 disappears. The spring 47 then generates a force that drives the slide 42 and the resistance welding head 44 to momentarily displace, i.e., the spring 47 pushes the resistance welding head 44 downwards, continuously pressing against the workpiece. At the point of collapse; to maintain effective contact pressure between the resistance welding head 44 and the workpiece at the moment of metal melting; in this scheme, the preload spring 47 is a physical energy storage, and its release speed is limited by the mechanical wave velocity of the material, which is close to the microsecond level; it does not go through any electronic processing logic, and it generates displacement at the moment the supporting force disappears (metal melts), which can ensure that effective contact pressure is always maintained at the moment of metal melting; this scheme makes only the very light end of the resistance welding head 44 displace when collapse occurs; the smaller moving mass can generate a large acceleration under the same elastic force, which significantly improves the ability to follow up on the rapid collapse of the current collector column.

[0040] like Figures 4 to 6 As shown, the movable groove 45 is also provided with an overrush buffer assembly 5, and the overrush buffer assembly 5 includes two sets of mounting plates 51 that slide in the movable groove 45, a permanent magnet part 52 fixed on one side of the mounting plate 51, and a conductive sensing plate 53 fixed outside the slide block 42. The magnetic pole surface of the permanent magnet part 52 is arranged facing the plane where the conductive sensing plate 53 is located, and the sliding trajectory of the conductive sensing plate 53 is located within the magnetic field range of the permanent magnet part 52.

[0041] An air gap is left between the conductive sensing plate 53 and the permanent magnet part 52, and the extension direction of the conductive sensing plate 53 is parallel to the displacement direction of the slide 42; the conductive sensing plate 53 has an area that covers part or all of the air gap, so that when the slide 42 moves downward under the drive of the spring 47, a relative displacement is generated between the conductive sensing plate 53 and the permanent magnet part 52 and the magnetic field lines are cut.

[0042] By adopting the above technical solution, the conductive induction plate 53 is made of a highly conductive material (such as pure aluminum or copper), and the permanent magnet part 52 is a group of neodymium iron boron permanent magnets arranged in an array. A strong single-sided magnetic field is constructed on one side of the permanent magnet part 52. When melting and collapse occur, the resistance welding head 44 moves downward at high speed with the slide 42 and the conductive induction plate 53. The conductive induction plate 53 cuts the strong magnetic field and generates eddy currents inside. The eddy currents themselves generate a reverse magnetic field, which interacts with the original magnetic field to generate a damping force proportional to the movement speed. The eddy current damping force is the largest when the following speed is the highest (when the collapse is the fastest). As the resistance welding head 44 gradually stops, the damping force disappears automatically. This allows the energy of the spring 47 to be released in a controlled manner, suppressing oscillation and rebound. It avoids the energy released by the spring 47 at the moment the metal collapses and stops, which may cause the welding head to violently hit the bottom of the workpiece or cause rebound.

[0043] like Figure 6 and Figure 7 As shown, the conductive sensing plate 53 includes two upper and lower first damping sections 531 fixed to the outside of the slide block 42, two follower adjustment sections 532 and a second damping section 533 fixed to the outside of the slide block 42 and located between the upper and lower first damping sections 531. The second damping section 533 is located between the two follower adjustment sections 532 and fixed to the outside of the slide block 42.

[0044] An opening 534 is provided on one side of the first damping section 531, the follow-up adjustment section 532, and the second damping section 533.

[0045] The following adjustment section 532 and the second damping section 533 are geometric drag reduction structures with a gradient distribution along the movement direction of the resistance welding head 44. The geometric drag reduction structure changes the effective sensing area or equivalent resistance of the conductive induction plate 53 in the magnetic field, so that the damping force during the following process decreases dynamically as the displacement increases.

[0046] By adopting the above technical solution, the conductive induction plate 53 adopts a three-section design. The upper and lower first damping sections 531 both adopt a high-purity, ultra-thick copper block structure. The lower first damping section 531 is configured to couple with the permanent magnet 52 to generate maximum feedback damping force during the initial pressing stage when the follower resistance welding head 44 contacts the workpiece, so as to suppress the oscillation of the resistance welding head 44. The upper first damping section 531 has a higher damping induction intensity per unit area than the uppermost end of the middle follower adjustment section 532, and is configured to provide instantaneous braking damping at the end of the collapse to absorb the follower residual kinetic energy and prevent The welding head impacts the bottom; the follow-up adjustment section 532 and the second damping section 533 form the gradient adjustment area in the middle (thickness change + gradient opening 534), whose effective conductive area and thickness gradually decrease with displacement, forming a dynamically tuned damping gradient; when collapse occurs, the resistance welding head 44 descends at high speed, and the conductive induction plate 53 passes through the magnet area; as the displacement increases, the damping force automatically and smoothly decreases; this prevents excessive damping force from being generated in the middle of the follow-up, ensuring that the energy of the spring 47 can be used for acceleration, making the entire follow-up process smoother and without lag, and avoiding rebound.

[0047] like Figure 5 As shown, it also includes two active tuning components 6, which are respectively connected to two sets of mounting plates 51; the active tuning component 6 includes multiple guide rods 62 fixed to the inner wall of the movable groove 45, a bidirectional lead screw 63 rotatably connected to the inner wall of the movable groove 45, and multiple extensions 61 integrally formed on a single set of two mounting plates 51, one of the extensions 61 being screwed to the outside of the bidirectional lead screw 63, and the remaining extensions 61 being movably sleeved on the outside of the multiple guide rods 62; two adjustment parts 64 are rotatably connected to the outside of the housing 41, and the two adjustment parts 64 are respectively connected to the two bidirectional lead screws 63.

[0048] By adopting the above technical solution, rotating the two adjusting parts 64 outside the housing 41 can drive the two bidirectional lead screws 63 to rotate. When the two bidirectional lead screws 63 rotate, one bidirectional lead screw 63 drives a set (two in number and symmetrically arranged) of mounting plates 51 to move towards or away from each other, making the distance between the permanent magnet part 52 on one side of this set of mounting plates 51 and the external conductive sensing plate 53 of the slide 42 smaller or larger; the other bidirectional lead screw 63 drives another set (two in number and symmetrically arranged) of mounting plates 51 to move towards or away from each other, making the distance between the permanent magnet part 52 on one side of this set of mounting plates 51 and the external conductive sensing plate 53 of the slide 42 smaller. The current collectors made of different materials (such as pure copper, aluminum, and composite materials) have completely different thermophysical properties and collapse rates. By adjusting the distance between the conductive induction plate 53 and the permanent magnet part 52, customized damping curves can be provided for materials with different collapse rates without changing the hardware. Furthermore, by adjusting the distance between the conductive induction plate 53 and the permanent magnet part 52, it can also be used as a compensation adjustment. When the conductive induction plate 53 heats up (causing the damping to weaken), the air gap is adjusted and reduced, and the loss of physical performance is compensated by geometric gain. This solution requires the installation of a temperature sensor on the conductive induction plate 53 to monitor its temperature changes.

[0049] Instructions for use: Place the workpiece to be welded on the welding table 1 and position it. Then, adjust the position of the welding assembly 4 along the X and Y axes using the dual-axis motion platform 2 to move the welding assembly 4 above the welding point of the workpiece. The welding assembly 4 is then driven to descend by the Z-axis adjustment assembly 3, bringing the resistance welding head 44 into contact with the workpiece. After the resistance welding head 44 contacts the workpiece, the Z-axis adjustment assembly 3 continues to move the housing 41 downwards, pressing the resistance welding head 44 onto the workpiece and applying pressure. At this time, the resistance welding head 44 applies force to the spring 47 through the second guide post 46 and the slide 42, compressing the spring 47 within the movable groove 45. When the resistance welding head 44 is working to weld the workpiece and the workpiece melts, the support force of the workpiece on the resistance welding head 44 disappears. The spring 47 then generates a force that drives the slide 42 and the resistance welding head 44 to momentarily displace, i.e., the spring 47 pushes the resistance welding head 44... 4. The downward pressure continues to press on the collapsed part of the workpiece; Since the external conductive induction plate 53 is provided on the slide 42 and a strong one-sided magnetic field is constructed on one side of the permanent magnet part 52, when melting and collapse occur, the resistance welding head 44 carries the slide 42 and the conductive induction plate 53 downward at high speed. During this process, the conductive induction plate 53 cuts the strong magnetic field and generates eddy currents inside. The eddy currents themselves generate a reverse magnetic field, which interacts with the original magnetic field to generate a damping force proportional to the movement speed. By rotating the two adjustment parts 64 on the outside of the housing 41, the two bidirectional lead screws 63 can be driven to rotate. When the bidirectional lead screws 63 rotate, they drive the two sets of mounting plates 51 to move towards each other or away from each other, so that the distance between the permanent magnet part 52 on one side of the mounting plate 51 and the external conductive induction plate 53 of the slide 42 becomes smaller or larger, thus adjusting the distance between the conductive induction plate 53 and the permanent magnet part 52.

[0050] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A lithium battery current collector welding device, comprising a welding table (1) and a dual-axis motion platform (2) disposed on the welding table (1), characterized in that: The Z-axis adjustment component (3) is fixedly connected to the moving end of the dual-axis motion platform (2), and a welding component (4) is fixedly connected to the moving end of the Z-axis adjustment component (3). The welding assembly (4) includes a housing (41) fixed to one side of the moving end of the Z-axis adjustment assembly (3), a movable groove (45) opened inside the housing (41), a slide (42) slidably connected in the movable groove (45), a spring (47) located in the movable groove (45), and a first guide post (43) fixed to the lower end of the slide (42). The other end of the first guide post (43) penetrates the housing (41) downward and extends outward, and a resistance welding head (44) is fixedly connected to the extended end of the first guide post (43). The two ends of the spring (47) are respectively connected to the inner wall of the movable groove (45) and the slide (42). The spring (47) is configured to store energy when the resistance welding head (44) is compressed and to release energy to drive the slide (42) to displacement when the workpiece melting support force decreases.

2. The lithium battery current collector welding device according to claim 1, characterized in that: The inner wall of the movable groove (45) is also fixedly connected to a second guide post (46), and the slide (42) is slidably sleeved on the outside of the second guide post (46).

3. The lithium battery current collector welding device according to claim 1, characterized in that: The movable groove (45) is also provided with an overrush buffer assembly (5), and the overrush buffer assembly (5) includes two sets of mounting plates (51) that slide in the movable groove (45), a permanent magnet part (52) fixed on one side of the mounting plate (51), and a conductive sensing plate (53) fixed outside the slide (42). The magnetic pole surface of the permanent magnet part (52) is arranged facing the plane where the conductive sensing plate (53) is located, and the sliding trajectory of the conductive sensing plate (53) is located within the magnetic field range of the permanent magnet part (52).

4. The lithium battery current collector welding device according to claim 3, characterized in that: An air gap is left between the conductive sensing plate (53) and the permanent magnet part (52), and the extension direction of the conductive sensing plate (53) is parallel to the displacement direction of the slide (42); the conductive sensing plate (53) has an area covering part or all of the air gap, so that when the slide (42) moves downward under the drive of the spring (47), a relative displacement is generated between the conductive sensing plate (53) and the permanent magnet part (52) and cuts the magnetic field lines.

5. The lithium battery current collector welding device according to claim 3, characterized in that: The conductive sensing plate (53) includes two upper and lower first damping sections (531) fixed outside the slide (42), two follower adjustment sections (532) fixed outside the slide (42) and located between the upper and lower first damping sections (531), and a second damping section (533). The second damping section (533) is located between the two follower adjustment sections (532) and fixed outside the slide (42).

6. The lithium battery current collector welding device according to claim 5, characterized in that: An opening (534) is provided on one side of the first damping section (531), the follow-up adjustment section (532), and the second damping section (533).

7. A lithium battery current collector welding device according to claim 5 or 6, characterized in that: The following adjustment section (532) and the second damping section (533) are geometric drag reduction structures with gradient distribution along the movement direction of the resistance welding head (44). The geometric drag reduction structure changes the effective sensing area or equivalent resistance of the conductive induction plate (53) in the magnetic field, so that the damping force during the following process decreases dynamically as the displacement increases.

8. The lithium battery current collector welding device according to claim 3, characterized in that: It also includes two active tuning components (6), and the active tuning components (6) are respectively connected to two sets of mounting plates (51); the active tuning components (6) include multiple guide rods (62) fixed to the inner wall of the movable groove (45), a bidirectional lead screw (63) rotatably connected to the inner wall of the movable groove (45), and multiple extensions (61) integrally formed on a single set of two mounting plates (51), one of the extensions (61) is screwed to the outside of the bidirectional lead screw (63), and the remaining extensions (61) are respectively movably sleeved on the outside of the multiple guide rods (62); the housing (41) is rotatably connected to two adjustment parts (64), and the two adjustment parts (64) are respectively connected to two bidirectional lead screws (63).

9. The lithium battery current collector welding device according to claim 1, characterized in that: A compression seat (49) is also slidably connected in the movable groove (45), and the compression seat (49) is located above the spring (47). A cylinder (48) is fixedly connected to the upper end of the housing (41), and the telescopic end of the cylinder (48) passes through the housing (41) and enters the movable groove (45) and is fixedly connected to the compression seat (49). The two ends of the spring (47) are respectively connected to the compression seat (49) and the slide (42).

10. A lithium battery current collector welding device according to claim 9, characterized in that: The cylinder (48) drives the compression seat (49) to move in the movable groove (45), actively compressing the spring (47) and compressing the spring (47) to the target pressure, so that the spring (47) is already in the target pressure state the moment the resistance welding head (44) contacts the workpiece.

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