A soft pack battery tab welding device

Abstract

The present invention relates to the technical field of soft-pack battery processing, and specifically to a soft-pack battery tab welding device, which comprises a fixed frame and a conveying assembly and a welding assembly arranged in sequence along the length direction of the fixed frame. The conveying assembly can convey and adjust a clamping tray holding a battery to cooperate with the welding assembly to automatically weld the battery tab. The conveying assembly comprises a transmission frame and a cam splitter arranged on the fixed frame. Two conveying chains with intervals are cyclically rotated on the transmission frame. A lifting cylinder driven by the cam splitter is provided between the two conveying chains. A lifting plate is provided at the telescopic end of the top of the lifting cylinder to lift the clamping tray and adjust the angle of the clamping tray. This solves the problem in the prior art that manual welding of soft-pack battery tabs easily leads to damage to the tabs and poor welding efficiency and quality.

Description

Technical Field

[0001] The present invention relates to the technical field of soft-pack battery processing, and in particular to a soft-pack battery tab welding device. Background Art

[0002] As the new energy industry develops towards intelligent and large-scale production, the penetration of soft-pack batteries in the power and energy storage sectors continues to increase due to their flexible packaging advantages. The welding process for tabs and cells faces the dual technical challenges of capacity expansion and quality control. Tabs, the electrical connection between the internal electrodes and the external circuitry of a battery cell, are initially assembled with soft-pack battery cells through welding. With tab thicknesses as thin as 10-30μm, the welding process places stringent demands on positioning accuracy and operator consistency. Traditional manual operation has become a core bottleneck restricting cell welding quality and industry upgrades.

[0003] In the current welding process of the tabs and battery cells, the manual operation mode exposes significant defects in the flexible production scenario of soft-pack batteries: on the one hand, manual operation is affected by physiological fatigue. During 8 hours of continuous operation, the position deviation control stability between the tabs and the battery cell electrodes is insufficient, resulting in the welding deviation rate increasing from 3% to 15%; the actual measured data of a battery cell factory shows that in the welding batches with manual participation, the problem of cold welding caused by positioning deviation accounts for 42% of the total quality defects of the battery cells, which directly affects the conductive performance of the battery cells.

[0004] On the other hand, manual operation has a significant efficiency ceiling. A skilled worker's single-station production capacity is approximately 30-40 pieces per hour, which is only 1 / 5-1 / 3 of that of an automated production line and is difficult to meet the production capacity requirements of soft-pack batteries. More importantly, manual operation cannot avoid potential damage to the interface between the tab and the battery cell due to human static electricity, as well as contamination of the welding interface by pollutants such as sweat and dandruff. These hidden factors can cause the battery cell weld strength to decay by 10%-15% after long-term cycling, seriously affecting the battery cell's service life and the overall performance of the soft-pack battery. Summary of the Invention

[0005] The purpose of the present invention is to provide a soft-pack battery tab welding device to solve the problem in the prior art that manual soft-pack battery tab welding easily causes tab damage and has poor welding efficiency and quality.

[0006] The present invention solves the deficiencies of the above-mentioned technical problems and adopts the following technical solutions: a soft-pack battery tab welding device, which comprises a fixing frame and a conveying assembly and a welding assembly arranged in sequence along the length direction of the fixing frame. The conveying assembly can convey and adjust a clamping tray holding a battery to cooperate with the welding assembly to automatically weld the battery tab;

[0007] The conveying assembly includes a transmission frame and a cam splitter mounted on a fixed frame. Two conveying chains with intervals are cyclically rotated on the transmission frame. A push-up cylinder driven by the cam splitter is provided between the two conveying chains. A lifting plate is provided at the telescopic end of the top of the lifting cylinder to lift the clamping tray and adjust the angle of the clamping tray.

[0008] The welding assembly includes two supporting frames arranged on a fixed frame. The supporting frames are provided with a gantry frame for driving the laser welding parts so as to make the laser welding parts move horizontally and vertically to perform welding on the corresponding tabs.

[0009] As a further optimization of the soft-pack battery tab welding equipment of the present invention: an auxiliary welding assembly is provided on the fixing frame, the auxiliary welding assembly includes an auxiliary welding frame fixed on the fixing frame, the auxiliary welding frame is provided with an auxiliary fixing frame corresponding to the pushing cylinder, an auxiliary fixing cylinder is fixed at the center of the auxiliary fixing frame, a pushing plate is fixed at the telescopic end of the auxiliary fixing cylinder, and the pushing plate is elastically connected to a pushing plate to cooperate with the lifting plate to press and position the battery.

[0010] As a further optimization of the soft-pack battery tab welding equipment of the present invention: telescopic rods are provided at the four corners of the push plate, and shock-absorbing springs are surrounded by the four telescopic rods, and the shock-absorbing springs are provided between the push plate and the push plate.

[0011] As a further optimization of the soft-pack battery tab welding equipment of the present invention: a fire prevention component is provided on the fixed frame, and the fire prevention component includes a guide frame and a monitoring component that drives the two conveyor chains to rotate in opposite directions. The guide frame is arranged on the fixed frame, and the guide frame is provided with an inclined surface with a higher position corresponding to the lower position of the conveyor chain corresponding to the fire extinguishing box. The monitoring component is connected to the auxiliary welding frame so that when the monitoring component detects a fire at the tab welding point, the burning battery can be transported to the fire extinguishing box for extinguishing the fire.

[0012] As a further optimization of the soft-pack battery tab welding equipment of the present invention: a longitudinal row frame is provided on the auxiliary welding frame, and the longitudinal row frame is connected to a transverse row frame to drive the welding guide assembly connected to the transverse row frame to move horizontally and vertically to correspond to the tab, so as to guide the laser welding part to accurately correspond to the tab and assist in laser welding.

[0013] As a further optimization of the soft-pack battery tab welding equipment of the present invention: the welding guide assembly includes a welding guide frame fixed on a horizontal row frame, and two welding nozzles are provided on the welding guide frame. The welding nozzles can assist the laser welding parts in welding the tabs. An adjustment platform is provided at the bottom of the welding guide frame, and four detectors are provided on the adjustment platform. The four detectors are tilted so that the emitted laser can pass through the welding nozzle, to assist the welding nozzle to accurately correspond to the tab, and the welding nozzle is connected to multiple pipes for outputting protective gas and inhaling harmful gas.

[0014] As a further optimization of the soft-pack battery tab welding equipment of the present invention: any one of the two welding nozzles is fixedly connected to the welding guide frame, and the other welding nozzle is connected to an adjustment component provided on the welding guide frame to adjust the distance between the two welding nozzles.

[0015] As a further optimization of the soft-pack battery tab welding equipment of the present invention: auxiliary cylinders are provided at the corresponding positions on both sides of the transmission frame and the lifting plate in the rotation direction of the conveyor chain, and the auxiliary cylinders drive the pressing wheels to assist in positioning the adjusted lifting plate position.

[0016] As a further optimization of the soft-pack battery tab welding equipment of the present invention: the transmission frame is away from the welding assembly and is provided with a limiting block at the edge of the corresponding lifting plate, and the limiting block is driven to vertically move by a limiting cylinder provided on the transmission frame.

[0017] As a further optimization of a soft-pack battery tab welding device of the present invention: the gantry frame includes a variable-pitch frame arranged on a carrying frame, the two variable-pitch frames are connected to an auxiliary frame to drive the longitudinal displacement of the auxiliary frame, the auxiliary frame is connected to a positioning frame to drive the lateral displacement of the positioning frame, and the positioning frame is connected to the laser welding part at one end facing the conveying assembly.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention realizes the conveyance of the clamped soft-pack battery tray by providing a conveying assembly, and ensures that the soft-pack battery moves upward stably and is accurately conveyed to the designated processing station through this assembly. The peripheral environment of the processing station does not set any restrictive obstacles, thereby effectively reducing the impact of external factors on the position stability of the soft-pack battery. In addition, the detector in the welding guide assembly is used to accurately verify the alignment of the welding nozzle and the tab, and then the laser welding equipment in the welding assembly is used to perform laser welding on the tab. This significantly reduces the manual operation links, reduces the damage that sweat may cause to the tab during operation, and improves the efficiency of the tab welding reinforcement operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view structural schematic diagram of the present invention;

[0021] Figure 2 It is a rear view structural schematic diagram of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the conveying assembly of the present invention;

[0023] Figure 4 Schematic diagram of the cross-sectional structure of the conveying assembly of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the auxiliary components of the present invention;

[0025] Markings in the figure: 1. Fixed frame; 2. Auxiliary welding assembly; 201. Auxiliary welding frame; 202. Longitudinal frame; 203. Horizontal frame; 204. Auxiliary fixing frame; 205. Auxiliary fixing cylinder; 206. Push plate; 207. Telescopic rod; 208. Shock-absorbing spring; 209. Push plate; 3. Conveying assembly; 301. Drive shaft; 302. Conveying chain; 303. Lifting plate; 304. Pressing wheel; 305. Pushing cylinder; 306. Positioning instrument; 307 , limiting block; 308, cam splitter; 309, transmission frame; 4, fire protection component; 401, guide frame; 402, fire extinguisher box; 403, monitoring component; 5, welding component; 501, carrier frame; 502, variable pitch frame; 503, auxiliary frame; 504, positioning frame; 505, laser welding component; 6, welding guide assembly; 601, welding guide frame; 602, adjustment platform; 603, detector; 604, adjustment component; 605, welding nozzle. DETAILED DESCRIPTION

[0026] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with examples, but the content of the present invention is not limited to the following examples.

[0027] like Figure 1 and Figure 2 As shown, a soft-pack battery tab welding device comprises a supporting frame 1. A conveyor assembly 3 and a welding assembly 5 are sequentially arranged along the length of the frame 1. Importantly, an auxiliary welding assembly 2 and a conductive welding assembly 6 are mounted above the conveyor assembly 3. These two components work in conjunction with the welding assembly 5 to complete the tab welding process. The conveyor assembly 3 is responsible for precisely positioning the clamping tray and soft-pack battery conveyed along the workflow to the corresponding positions of the auxiliary welding assembly 2 and the conductive welding assembly 6. Subsequently, through adjustment by the conveyor assembly 3, the soft-pack battery is lifted to a specific height, ensuring precise alignment of its tab with the auxiliary welding assembly 2 and the conductive welding assembly 6. Furthermore, this process lifts the soft-pack battery into a relatively isolated space, minimizing interference from external factors and ensuring the accuracy and stability of the tab welding operation. Once the soft-pack battery reaches the predetermined position, the auxiliary welding assembly 2 adjusts its posture, driving the conductive welding assembly 6 to initially align with the soft-pack battery tab. At the same time, the welding assembly 6 will perform precise measurements, and the auxiliary welding assembly 2 will make adjustments based on the measurement results to ensure that the welding assembly 6 accurately corresponds to the tab. Next, the welding assembly 6 cooperates with the welding assembly 5 to weld the tab. After the tab welding on one side is completed, the conveyor assembly 3 turns the soft-pack battery and repeats the above operation to complete the tab welding on the other side. After the tabs on both sides are welded, the conveyor assembly 3 reverses and transfers the welded soft-pack battery back to the workflow for subsequent processing steps.

[0028] like Figure 3 and Figure 4 As shown, the conveyor assembly 3 comprises a transmission frame 309 corresponding to the workflow. The transmission frame 309 is equipped with two drive shafts 301, one of which is driven by a drive motor and can rotate forward and backward. Both drive shafts 301 are equipped with conveyor sprockets to drive the conveyor chains 302, which are tensioned on the two drive shafts 301, to rotate in a circular motion. This is intended to improve transmission efficiency and ensure the stable transmission of soft-pack batteries. The conveyor chain 302 consists of two chains, with the chain links corresponding to each other and arranged in parallel. The outer side of the chain link engages with the two bottom sides of the protective plate. The protective plate has an inverted U-shaped design to protect the surface of the soft-pack battery, while increasing friction during transmission and reducing the risk of slipping on the conveyor chain 302. The drive motor uses a forward and reverse stepper motor with a simple structure, convenient control, and reliable operation. It can realize the forward and reverse cycle operation of the two conveyor chains, thereby achieving stable bidirectional transmission of soft-pack batteries, improving the flexibility of the equipment, and ensuring the smooth operation of the production process. There are two conveying sprockets and two conveying chains 302, which are respectively installed on the two ends of the transmission shaft 301 inside the transmission frame 309. This is to enhance the carrying capacity of the conveying assembly 3 and ensure the stability of the soft-pack battery after it is moved to the vertical position of the work station. A pushing cylinder 305 connected to the fixed frame 1 is provided between the two transmission chains. The pushing cylinder 305 is driven to rotate by the cam splitter 308 provided on the fixed frame 1. The telescopic end of the pushing cylinder 305 is fixedly installed with a lifting plate 303. The edge of the lifting plate 303 corresponds to the positioner 306 provided on the fixed frame 1. The positioner 306 is an infrared sensor. When the infrared ray emitted by the positioner 306 is blocked by the clamping tray holding the battery, the two conveying chains 302 will stop running, and then the pushing cylinder 305 will push the lifting plate 303 to drive the clamping tray and the battery to move to the corresponding height position. The fixed frame 1 is provided with holding rollers 304 on both sides of the lifting plate 303 in the direction of rotation of the conveyor chain 302. The holding rollers 304 are driven by auxiliary cylinders installed on the fixed frame 1. When the clamping tray is pushed to the appropriate height and the angle is adjusted by the cam divider 308, the two holding rollers 304 will clamp the clamping tray in place, thereby further ensuring the stability of the welding assembly 5 during the welding process of the tab. The fixed frame 1 is also provided with a limiting block 307 driven by a limiting cylinder for vertical displacement. The limiting block 307 can prevent the lifting cylinder 305 from vibrating during the process of moving the clamping tray up and down or changing its angle, which is caused by the position change caused by the lifting cylinder 305. This is intended to reduce the possibility of position change between the clamping tray and the auxiliary welding assembly 2 and the guide welding assembly 6 after the lifting cylinder 305 changes its angle, that is, to reduce the time required for repeated calibration of the auxiliary welding assembly 2 and the guide welding assembly 6 with the tab, thereby ensuring the efficiency of the tab welding process. When the clamping tray needs to be imported or exported, the limiting cylinder can move the limiting block 307 downward to enable the clamping tray to be stably imported or exported.

[0029] like Figure 5 As shown, the auxiliary welding assembly 2 consists of an auxiliary welding frame 201 and a longitudinal frame 202 arranged on the fixed frame 1. An auxiliary fixing cylinder 205 is fixedly installed at the center of the auxiliary welding frame 201. The auxiliary fixing cylinder 205 drives a push plate 206. Telescopic rods 207 are installed at the four corners of the push plate 206. The telescopic ends of the four telescopic rods 207 are fixedly connected to a push plate 209, and the outer periphery of the telescopic rods 207 is surrounded by a shock-absorbing spring 208 arranged between the push plate 209 and the push plate 206. After the push cylinder 305 pushes the soft-pack battery to the appropriate height, the auxiliary fixing cylinder 205 will drive the push plate 209 and the push plate 206 to press the top of the battery after the angle adjustment of the soft-pack battery is completed, so as to further stabilize the position of the soft-pack battery, that is, to maintain the position stability of the tab during the processing process. As the push plate 209 presses against the soft-pack battery, the shock-absorbing spring 208 mitigates the vibration generated by the extension of the auxiliary cylinder 205 to press against the soft-pack battery, thereby reducing the positional change of the soft-pack battery caused by the vibration. The longitudinal frame 202 drives the transverse frame 203 to move longitudinally, and the transverse frame 203 drives the welding assembly 6 to move laterally to adjust the position of the welding assembly 6 to correspond with the tab. The welding assembly 6 includes a welding frame 601 that is driven by the transverse frame 203 to move laterally. The bottom of the welding frame 601 is provided with an adjustment platform 602, on which four detectors 603 are mounted. These four detectors 603 are arranged at an angle so that their laser lines can intersect and cross through the small openings of the two welding nozzles 605 provided on the welding frame 601 to correspond to the four vertices of the soft-pack battery tab, thereby assisting in determining the welding position of the soft-pack battery tab. After the laser is reflected at the four vertices of the tab of the soft-pack battery, it crosses through the welding port of the welding nozzle 605 again and is detected by the detector 603. This process not only realizes the precise measurement and verification of the tab position, but also improves the reliability and stability of the measurement. During the detection process, the corresponding electronic control system will be used to control the operation of the longitudinal rack 202 and the transverse rack 203 to ensure that the tab of the soft-pack battery corresponds precisely to the welding nozzle 605. After the position detection is completed, the adjustment platform 602 will drive the corresponding positioner 306 to make way so that the welding nozzle 605 can move unimpeded along the length direction of the fixed frame 1. There are two longitudinal racks 202, transverse racks 203 and auxiliary fixed racks 204 installed on the conveying assembly 3, the welding guide assembly 6, and the auxiliary welding frame 201, and they are arranged in sequence along the width direction of the fixed frame 1, thereby improving the efficiency of the tab welding. As Figure 1As shown, the fixed frame 1 is equipped with two supporting frames 501, each of which is equipped with a gantry frame comprising a variable-pitch frame 502. The variable-pitch frame 502 drives an auxiliary frame 503 toward the welding nozzle 605, which in turn drives a positioning frame 504 to move along the width of the fixed frame 1. A laser welding component 505 and an infrared sensor aligned with the welding nozzle 605 are fixedly mounted on the end of the positioning frame 504 facing the welding nozzle 605. When the laser light emitted by the infrared sensor passes through the side wall of the welding nozzle 605, it indicates initial movement into position. After the laser light emitted by the infrared sensor passes through the hollow structure of the welding nozzle 605, the parameter position of the laser welding component 505 is stably aligned with the welding nozzle 605. The welding laser light emitted by the laser welding component 505 then passes through the welding nozzle 605 to weld the tab. After parameter calibration, control adjustments can also be made using a CNC system. The specific equipment model and operating principle used to align the laser welding component 505 with the welding nozzle 605 should be understood as existing technology. During the welding process, the pipe connected to the welding nozzle 605 will spray shielding gas and absorb harmful gases after welding, thereby ensuring the quality of the tab welding. In addition, the provision of the auxiliary rack 503 allows the two sets of welding nozzles 605 to perform welding operations in turns, further improving the efficiency of tab welding. One of the two welding nozzles 605 is connected to the welding guide frame 601 via an adjustment assembly 604, while the other is fixed to the welding guide frame 601. This makes it easy for the operator to adjust the spacing between the two welding nozzles 605 to accommodate the bending surfaces of tabs of different sizes. The adjustment assembly 604 includes a blocking motor mounted on the welding guide frame 601. The auxiliary motor drives an adjustment screw mounted on the welding guide frame 601. The auxiliary motor is a reversible stepper motor. When the auxiliary motor rotates forward and reverse, the adjustment screw cooperates with the threaded block connected to the welding nozzle 605 to drive the welding nozzle 605, which is slidably engaged with the welding guide frame 601, to move, thereby adjusting the spacing between the two welding nozzles 605.

[0030] like Figure 1 and Figure 2As shown, a fire prevention component 4 is provided on the fixing frame 1 at a position corresponding to the laser welding part 505. The fire prevention component 4 includes a monitoring component 403 provided on the auxiliary fixing frame 204 and a guide frame 401 provided on the transmission frame 309 facing the laser welding part 505. The monitoring component 403 is an image monitoring device, and can also be a smoke alarm device. When a fire occurs in the soft-pack battery during the welding process, the monitoring component 403 will send a signal to control the conveying chain 302 to rotate in the opposite direction, thereby conveying the burning soft-pack battery to the guide frame 401. Subsequently, the guide frame 401 guides the soft-pack battery into the fire extinguishing box 402, and the water or flame retardant foam provided in the fire extinguishing box 402 will extinguish the fire of the soft-pack battery. It is particularly noteworthy that multiple ball bearings can be provided on the inclined surface of the guide frame 401 to reduce the friction between the soft-pack battery and the inclined surface of the guide frame 401, thereby increasing the speed at which the soft-pack battery is sent into the fire extinguishing box 402 after passing through the guide frame 401, that is, shortening the time that the soft-pack battery poses a threat to the equipment in the outside world.

[0031] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A soft pack battery tab welding device, characterized by: It comprises a fixing frame (1), a conveying assembly (3) and a welding assembly (5) sequentially arranged along the length direction of the fixing frame (1), wherein the conveying assembly (3) can convey and adjust a clamping tray holding a battery to cooperate with the welding assembly (5) to automatically weld the battery tabs; The conveying assembly (3) includes a transmission frame (309) and a cam splitter (308) arranged on a fixed frame (1); two conveying chains (302) are cyclically rotated on the transmission frame (309) and are spaced apart; a lifting cylinder (305) driven by the cam splitter (308) is provided between the two conveying chains (302); a lifting plate (303) is provided at the top telescopic end of the lifting cylinder (305) to lift the clamping tray and adjust the angle of the clamping tray; The welding assembly (5) comprises two supporting frames (501) arranged on a fixed frame (1), and a gantry frame for driving a laser welding component (505) is provided on the supporting frame (501) so as to allow the laser welding component (505) to move horizontally and vertically to perform welding on the corresponding tabs; The fixing frame (1) is provided with an auxiliary welding assembly (2), the auxiliary welding assembly (2) includes an auxiliary welding frame (201) fixed on the fixing frame (1), an auxiliary fixing frame (204) corresponding to the pushing cylinder (305) is provided on the auxiliary welding frame (201), an auxiliary fixing cylinder (205) is fixed at the center of the auxiliary fixing frame (204), a pushing plate (206) is fixed at the telescopic end of the auxiliary fixing cylinder (205), and the pushing plate (206) is elastically connected to a pushing plate (209) to cooperate with the lifting plate (303) to press and position the battery; The auxiliary welding frame (201) is provided with a longitudinal frame (202), and the longitudinal frame (202) is connected to a transverse frame (203) to drive the welding guide assembly (6) connected to the transverse frame (203) to move horizontally and vertically to correspond to the pole lug, so as to guide the laser welding part (505) to accurately correspond to the pole lug and assist in laser welding; The welding guide assembly (6) includes a welding guide frame (601) fixed on a horizontal row frame (203), two welding nozzles (605) are provided on the welding guide frame (601), and the welding nozzles (605) can assist the laser welding part (505) in welding the pole ear. An adjustment platform (602) is provided at the bottom of the welding guide frame (601), and four detectors (603) are provided on the adjustment platform (602). The four detectors (603) are tilted to allow the emitted laser to pass through the welding nozzles (605), that is, the laser can cross through the small openings of the two welding nozzles (605) provided on the welding guide frame (601) to correspond to the four vertices of the pole ear of the soft-pack battery, and after the laser is reflected at the four vertices of the pole ear of the soft-pack battery, it crosses through the welding opening of the welding nozzle (605) again and is detected by the detector (603), so as to assist in completing the precise correspondence between the welding nozzle (605) and the pole ear, and the welding nozzle (605) is connected to a plurality of pipes for outputting protective gas and inhaling harmful gas; Any one of the two welding nozzles (605) is fixedly connected to the welding guide frame (601), and the other welding nozzle (605) is connected to an adjustment component (604) provided on the welding guide frame (601) to adjust the distance between the two welding nozzles (605).

2. The soft pack battery tab welding device according to claim 1, characterized in that: The push plate (206) is provided with telescopic rods (207) at the four corners, and the four telescopic rods (207) are surrounded by shock-absorbing springs (208). The shock-absorbing springs (208) are provided between the push plate (206) and the push plate (209).

3. The soft pack battery tab welding device according to claim 1, characterized in that: The fixed frame (1) is provided with a fire prevention assembly (4), which includes a guide frame (401) and a monitoring member (403) for driving the two conveyor chains (302) to rotate in opposite directions. The guide frame (401) is provided on the fixed frame (1), and a slope is provided on the guide frame (401), with a higher position corresponding to the conveyor chain (302) and a lower position corresponding to the fire extinguishing box (402). The monitoring member (403) is connected to the auxiliary welding frame (201) to When (403) detects a fire at the tab welding location, the burning battery is transported to the fire extinguishing box (402) for extinguishing the fire.

4. The soft pack battery tab welding device according to claim 1, characterized in that: Auxiliary cylinders are provided at corresponding positions on both sides of the transmission frame (309) and the lifting plate (303) in the direction of rotation of the conveying chain (302), and the auxiliary cylinders drive the pressing wheel (304) to assist in positioning the adjusted lifting plate (303).

5. The soft pack battery tab welding device according to claim 1, characterized in that: The transmission frame (309) is provided with a limiting block (307) at an edge thereof, which is away from the welding assembly (5) and corresponds to the lifting plate (303). The limiting block (307) is driven to move vertically by a limiting cylinder provided on the transmission frame (309).

6. The soft pack battery tab welding device according to claim 1, characterized in that: The gantry frame includes a variable pitch frame (502) provided on a carrier frame (501), wherein the two variable pitch frames (502) are connected to auxiliary frames (503) to drive the auxiliary frames (503) to move longitudinally, and the auxiliary frames (503) are connected to a positioning frame (504) to drive the positioning frame (504) to move transversely, and one end of the positioning frame (504) facing the conveying assembly (3) is connected to a laser welding part (505).

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