Soft package battery tab welding equipment

Abstract

The invention relates to the technical field of soft package battery processing, in particular to soft package battery tab welding equipment which is provided with a fixing frame, a conveying assembly and a welding assembly, and the conveying assembly and the welding assembly are sequentially arranged in the length direction of the fixing frame. The welding assembly is matched to automatically weld the battery tabs; the conveying assembly comprises a conveying frame arranged on the fixing frame and a cam cutting machine, two conveying chains which are distributed at intervals are arranged on the conveying frame in a circulating rotating mode, a pushing air cylinder driven by the cam cutting machine is arranged between the two conveying chains, and a supporting disc is arranged at the telescopic end of the top of the pushing air cylinder so as to support the clamping tray and adjust the angle of the clamping tray. The problems that in the prior art, when soft package battery tabs are manually welded, the tabs are prone to being damaged, and the welding efficiency and quality are poor are solved.

Description

Technical Field

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

[0002] With the in-depth development of the new energy industry towards the directions of intelligence and scale, the penetration rate of soft-pack batteries in the fields of power and energy storage has been continuously increasing due to their flexible packaging advantages. The welding process between the tabs and the battery cells is facing double technical challenges of production capacity upgrade and quality control. As the electrical connection hub between the internal electrodes of the battery cell and the external circuit, the tabs have been preliminarily assembled with the soft-pack battery cells by welding. At the microscale where the tab thickness is as thin as 10 - 30 μm, the welding process poses harsh requirements on the positioning accuracy and operation consistency. The traditional operation mode involving manual participation has become the core bottleneck restricting the welding quality of the battery cells and industrial upgrading.

[0003] In the current welding process of the tabs and the battery cells, the manual operation mode exposes significant defects in the flexible production scenario of soft-pack batteries: on the one hand, affected by physiological fatigue during manual operation, when continuously operating for 8 hours, the stability of controlling the position deviation between the tabs and the battery cell electrodes is insufficient, resulting in the welding deviation rate increasing from 3% to 15%. The measured data of a certain battery cell factory shows that in the welding batches involving manual participation, the problem of false soldering caused by positioning deviation accounts for 42% of the total quality defects of the battery cells, directly affecting the electrical conductivity of the battery cells.

[0004] On the other hand, the efficiency ceiling of manual operation is obvious. The single-station production capacity of skilled workers is about 30 - 40 pcs / h, only 1 / 5 - 1 / 3 of that of an automated production line, and it is difficult to meet the production capacity requirements of soft-pack batteries. More critically, manual operation cannot avoid the potential damage of human static electricity to the connection interface between the tabs and the battery cells, as well as the pollution of the welding interface by pollutants such as sweat and dandruff. These hidden factors will cause the welding strength of the battery cells to decay by 10% - 15% after long-term cycling, seriously affecting the service life of the battery cells and the overall performance of the soft-pack batteries. Summary of the Invention

[0005] The purpose of the present invention is to provide a soft-pack battery tab welding device to solve the problems in the prior art that manual welding of soft-pack battery tabs is prone to tab damage, and the welding efficiency and quality are both poor.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a soft-pack battery tab welding device, which has a fixed frame, a conveying component and a welding component arranged in sequence along the length direction of the fixed frame. The conveying component can convey and adjust the clamping tray holding the battery to cooperate with the welding component to automatically weld the battery tabs.

[0007] The conveying assembly includes a transmission rack and a cam divider disposed on the fixed frame. There are two conveying chains that are circularly rotated and spaced apart on the transmission rack. A pushing cylinder driven by the cam divider is provided between the two conveying chains. A lifting tray is provided at the top telescopic end of the pushing cylinder to lift and hold the clamping tray and adjust the angle of the clamping tray.

[0008] The welding assembly includes two bearing racks disposed on the fixed frame. A gantry frame for driving the laser welding part is provided on the bearing rack to enable the laser welding part to perform horizontal and vertical displacements to weld the tabs correspondingly.

[0009] As a further optimization of a soft-pack battery tab welding device according to the present invention: A secondary welding assembly is provided on the fixed frame. The secondary welding assembly includes a secondary welding rack fixedly disposed on the fixed frame. A secondary fixing frame corresponding to the pushing cylinder is provided on the secondary welding rack. A secondary fixing cylinder is fixedly provided at the center of the secondary fixing frame. A pushing plate is fixedly provided at the telescopic end of the secondary fixing cylinder. The pushing plate is elastically connected with a pressing plate to cooperate with the lifting tray to press and position the battery.

[0010] As a further optimization of a soft-pack battery tab welding device according to the present invention: Telescopic rods are provided at the four corners of the pushing plate, and shock-absorbing springs are wound around the four telescopic rods. The shock-absorbing springs are disposed between the pushing plate and the pressing plate.

[0011] As a further optimization of a soft-pack battery tab welding device according to the present invention: A fire prevention assembly is provided on the fixed frame. The fire prevention assembly includes a guiding frame and a monitoring member for driving the two conveying chains to rotate in opposite directions. The guiding frame is disposed on the fixed frame, and the guiding frame is provided with an inclined surface where the higher part corresponds to the conveying chain and the lower part corresponds to a fire extinguishing box. The monitoring member is connected to the secondary welding rack to convey the burning battery to the fire extinguishing box for extinguishing when the monitoring member detects that the tab welding part catches fire.

[0012] As a further optimization of a soft-pack battery tab welding device according to the present invention: A longitudinal frame is provided on the secondary welding rack. The longitudinal frame is connected with a transverse frame to drive the transverse and longitudinal displacements of the welding guiding assembly connected to the transverse frame to correspond to the tabs, so as to guide the laser welding part to accurately correspond to the tabs and assist in laser welding.

[0013] As a further optimization of a soft-pack battery tab welding device according to the present invention: The welding guiding assembly includes a welding guiding rack fixedly disposed on the transverse frame. Two welding nozzles are provided on the welding guiding rack. The welding nozzles can assist the laser welding part to weld the tabs. An adjustment platform is provided at the bottom of the welding guiding rack. Four detectors are provided on the adjustment platform. The four detectors are inclined so that the emitted laser can pass through the welding nozzles to assist the welding nozzles to accurately correspond to the tabs, and the welding nozzles are communicated with a plurality of 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 arranged 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 conveying 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: a limiting block is provided at the edge of the transmission frame away from the welding assembly and corresponding to the lifting plate, and the limiting block is driven to vertically move by a limiting cylinder arranged 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, two variable-pitch frames are connected with auxiliary frames to drive the auxiliary frames to move longitudinally, the auxiliary frames are connected with positioning frames to drive the positioning frames to move laterally, and one end of the positioning frame facing the conveying assembly is connected to the laser welding part.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes the conveying of the clamped soft-pack battery tray by providing a conveying component, and ensures that the soft-pack battery moves upward stably and is accurately conveyed to the designated processing station through the component. The peripheral environment of the processing station does not set any restrictive obstacles, thereby effectively reducing the influence of external factors on the position stability of the soft-pack battery. In addition, the detector in the welding assembly is used to accurately verify the alignment of the welding nozzle and the pole ear, and then the laser welding equipment in the welding assembly is used to perform laser welding on the pole ear. This significantly reduces the manual operation links, reduces the damage that sweat may cause to the pole ear during operation, and improves the efficiency of the pole ear welding reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view structural schematic diagram of the present invention;

[0020] Figure 2 It is a rear view structural schematic diagram of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the conveying assembly of the present invention;

[0022] Figure 4 It is a schematic cross-sectional structure diagram of the conveying assembly of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the auxiliary components of the present invention;

[0024] Markings in the figure: 1. Fixed frame; 2. Auxiliary welding assembly; 201. Auxiliary welding frame; 202. Longitudinal row frame; 203. Transverse row frame; 204. Auxiliary fixing frame; 205. Auxiliary fixing cylinder; 206. Pushing plate; 207. Telescopic rod; 208. Shock-absorbing spring; 209. Pushing and pressing plate; 3. Conveyor assembly; 301. Drive shaft; 302. Conveyor chain; 303. Lifting tray; 304. Pressing and fixing wheel; 305. Pushing cylinder; 306. Position measuring instrument; 307. Limiting block; 308. Indexing cam; 309. Transmission frame; 4. Fire protection assembly; 401. Guide frame; 402. Fire extinguishing box; 403. Monitoring component; 5. Welding assembly; 501. Bearing frame; 502. Variable pitch row frame; 503. Auxiliary row frame; 504. Positioning frame; 505. Laser welding component; 6. Guide welding assembly; 601. Guide welding frame; 602. Adjustment platform; 603. Detection instrument; 604. Adjustment component; 605. Welding nozzle. Detailed implementation

[0025] To better understand the present invention, the content of the present invention will be further clarified below in conjunction with embodiments, but the content of the present invention is not limited to the following embodiments.

[0026] As Figure 1 and Figure 2 shown, a soft-pack battery tab welding device has a fixed frame 1 that can play a supporting role. In the length direction of the fixed frame 1, a conveyor assembly 3 and a welding assembly 5 are arranged in sequence. Particularly importantly, an auxiliary welding assembly 2 and a guide welding assembly 6 are assembled above the conveyor assembly 3, and these two major assemblies cooperate with the welding assembly 5 to complete the tab welding process. The conveyor assembly 3 is responsible for accurately positioning the clamping tray and the soft-pack battery conveyed on the workflow to the corresponding positions of the auxiliary welding assembly 2 and the guide welding assembly 6. Subsequently, through the adjustment of the conveyor assembly 3, the soft-pack battery is lifted to a specific height to ensure that its tabs are accurately aligned with the auxiliary welding assembly 2 and the guide welding assembly 6. In addition, this process also lifts the soft-pack battery to a relatively independent space, aiming to reduce the interference of external factors, thereby ensuring the accuracy and stability of the tab welding operation. When the soft-pack battery moves to the predetermined position, the auxiliary welding assembly 2 adjusts its own posture to drive the guide welding assembly 6 to be initially aligned with the tabs of the soft-pack battery. At the same time, the guide welding assembly 6 performs precise measurement, and the auxiliary welding assembly 2 adjusts according to the measurement results to ensure the accurate correspondence between the guide welding assembly 6 and the tabs. Immediately afterwards, the guide welding assembly 6 cooperates with the welding assembly 5 to weld the tabs. After one side of the tabs is welded, the conveyor assembly 3 turns the soft-pack battery and repeats the above operations to complete the welding of the tabs on the other side. After the tabs on both sides are welded, the conveyor assembly 3 runs in reverse to convey the welded soft-pack battery back to the workflow for subsequent processing operations.

[0027] As Figure 3 andFigure 4 As shown in the figure, the conveying assembly 3 includes a transmission rack 309 corresponding to the workflow. Two transmission shafts 301 are assembled on the transmission rack 309. One of the transmission shafts 301 is driven by a driving motor and can rotate forward and backward. Conveyor sprockets are installed on both of the two transmission shafts 301 to drive the conveyor chain 302 tensioned on the two transmission shafts 301 to rotate cyclically. This is aimed at improving the transmission efficiency and ensuring the stable transmission of soft-pack batteries. The conveyor chain 302 consists of two chains, and the chain links correspond to each other one by one and are arranged in parallel. The outer sides of the chain links are clamped with the two bottoms of the protective sheet, and the protective sheet is designed in an inverted U shape to protect the surface of the soft-pack battery and at the same time increase the friction of the soft-pack battery during transmission and reduce the risk of slipping on the conveyor chain 302. The driving motor is a forward and reverse stepper motor, which has a simple structure, convenient control and reliable operation. It can realize the forward and reverse cyclic operation of the two transmission chains, so as to realize the stable two-way transmission of soft-pack batteries, improve the flexibility of the equipment and ensure the smooth progress of the production process. Both the conveyor sprockets and the conveyor chain 302 are configured with two, and are respectively installed at both ends of the transmission shaft 301 inside the transmission rack 309, which is aimed at enhancing the bearing capacity of the conveying assembly 3 and ensuring the stability of the soft-pack battery after moving 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 by a cam divider 308 provided on the fixed frame 1 to rotate. A lifting tray 303 is fixedly installed at the telescopic end of the pushing cylinder 305, and the edge of the lifting tray 303 corresponds to a position detector 306 provided on the fixed frame 1, and the position detector 306 is an infrared sensor. When the infrared rays emitted by the position detector 306 are blocked by the clamping tray holding the battery, the two conveyor chains 302 will stop running, and then the pushing cylinder 305 will push the lifting tray 303 to drive the clamping tray and the battery to move up to the corresponding height position. Pressing wheels 304 are provided on both sides of the fixed frame 1 corresponding to the lifting tray 303 along the rotation direction of the conveyor chain 302, and the pressing wheels 304 are pushed by an auxiliary cylinder provided 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 pressing wheels 304 will clamp and position the position of the clamping tray, so as to further ensure the stability during the process of the welding assembly 5 welding the pole ears. A limiting block 307 driven by a limiting cylinder to perform vertical displacement is also provided on the fixed frame 1. The limiting block 307 can prevent the position change caused by the vibration of the pushing cylinder 305 during the process of the pushing cylinder 305 moving the clamping tray up and down or changing the angle. This is aimed at reducing the possibility of the position change between the clamping tray and the auxiliary welding assembly 2 and the guiding welding assembly 6 after the pushing cylinder 305 changes the angle, that is, reducing the time for the auxiliary welding assembly 2 and the guiding welding assembly 6 to repeatedly calibrate with the pole ears, so as to ensure the efficiency of fixing the pole ear welding process. When it is necessary to input or output the clamping tray, the limiting cylinder can lower the limiting block 307 to enable the clamping tray to pass through stably for input or output.

[0028] As Figure 5 shown, the auxiliary soldering assembly 2 is composed of an auxiliary soldering frame 201 and a longitudinal row frame 202 provided on the fixing frame 1. An auxiliary fixing cylinder 205 is fixedly installed at the center of the auxiliary soldering 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 and press plate 209. A shock-absorbing spring 208 is arranged around the outer periphery of the telescopic rod 207 between the push and press plate 209 and the push plate 206. After the pushing cylinder 305 pushes the soft-pack battery to a proper height, the auxiliary fixing cylinder 205 will drive the push and press 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. During the process of the push and press plate 209 pressing the soft-pack battery, the shock-absorbing spring 208 will reduce the vibration generated when the auxiliary fixing cylinder 205 extends to press the soft-pack battery, thereby reducing the position change of the soft-pack battery caused by the vibration. The longitudinal row frame 202 drives the transverse row frame 203 to move longitudinally, and the transverse row frame 203 drives the welding guide assembly 6 to move transversely to adjust the position of the welding guide assembly 6 to correspond to the tab. The welding guide assembly 6 includes a welding guide frame 601 driven by the transverse row frame 203 to move transversely. An adjustment platform 602 is arranged at the bottom of the welding guide frame 601. Four detectors 603 are installed on the adjustment platform 602. The four detectors 603 are inclinedly distributed so that their laser lines can cross and intersect through the small openings of two welding nozzles 605 arranged on the welding guide frame 601 to correspond to the four vertices of the tab of the soft-pack battery, that is, to assist in determining the welding position of the tab of the soft-pack battery. After the laser is reflected at the four vertices of the tab of the soft-pack battery, it crosses through the welding ports of the welding nozzles 605 again and is detected by the detectors 603. This process not only realizes the accurate 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 coordinated to control the operation of the longitudinal row frame 202 and the transverse row frame 203 to ensure the accurate correspondence between the tab of the soft-pack battery and the welding nozzles 605. After the position detection is completed, the adjustment platform 602 will drive the corresponding position detector 306 to give way so that the welding nozzles 605 can move unobstructedly along the length direction of the fixing frame 1. The conveying assembly 3, the welding guide assembly 6, the longitudinal row frame 202, the transverse row frame 203 and the auxiliary fixing frame 204 installed on the auxiliary soldering frame 201 are all configured with two and are arranged in sequence along the width direction of the fixing frame 1, thereby improving the efficiency of tab welding. As Figure 1As shown in the figure, two carrier frames 501 are provided on the fixing frame 1. A variable pitch traveling frame 502 included in a gantry traveling frame is installed on the two carrier frames 501. The variable pitch traveling frame 502 drives the auxiliary traveling frame 503 to approach the welding nozzle 605. The auxiliary traveling frame 503 drives the positioning frame 504 to displace along the width direction of the fixing frame 1. A laser welding part 505 and an infrared sensor aligned with the welding nozzle 605 are fixedly installed at the end of the positioning frame 504 facing the welding nozzle 605. When the laser emitted by the infrared sensor passes by the side wall of the welding nozzle 605, it indicates that the preliminary movement is in place. After the laser emitted by the infrared sensor passes through the hollow structure of the welding nozzle 605, the parameter position of the laser welding part 505 can be stably corresponded to the welding nozzle 605. Then, the welding laser emitted by the laser welding part 505 can pass through the welding nozzle 605 to weld the tab. The control adjustment after parameter calibration can also be performed through the numerical control system. The specific equipment model and working principle for corresponding the laser welding part 505 to the welding nozzle 605 should be understood as the prior art. During the welding process, the pipeline connected to the welding nozzle 605 will eject a protective gas and absorb harmful gases after welding, so as to ensure the welding quality of the tab. In addition, the setting of the auxiliary traveling frame 503 enables the two groups of welding nozzles 605 to perform welding operations alternately, further improving the efficiency of welding the tabs. One of the two welding nozzles 605 is connected to the welding guide frame 601 through an adjusting assembly 604, and the other is fixedly arranged on the welding guide frame 601, so as to facilitate the operator to adjust the distance between the two welding nozzles 605 to adapt to the tab bending surfaces of different sizes for use. The adjusting assembly 604 includes a blocking motor arranged on the welding guide frame 601. The auxiliary motor drives an adjusting screw rod rotatably arranged on the welding guide frame 601. The auxiliary motor is a stepper motor that can rotate forward and backward. When the auxiliary motor rotates forward and backward, the adjusting screw rod can cooperate with a threaded block connected to the welding nozzle 605 to drive the welding nozzle 605 slidingly matched with the welding guide frame 601 to displace, so as to adjust the distance between the two welding nozzles 605.

[0029] As Figure 1 and Figure 2As shown in the figure, a fire prevention component 4 is provided at a position on the fixing frame 1 corresponding to the laser welding part 505. The fire prevention component 4 includes a monitoring part 403 provided on the auxiliary fixing frame 204 and a guiding frame 401 provided on the transmission frame 309 facing the laser welding part 505. The monitoring part 403 is an image monitoring device or a smoke alarm device. When a soft-pack battery catches fire during the welding process, the monitoring part 403 will send a signal to control the reverse rotation of the conveying chain 302, so as to convey the burning soft-pack battery to the guiding frame 401. Subsequently, the guiding frame 401 will guide 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 soft-pack battery. It is particularly worth noting that a plurality of balls can be provided on the inclined surface of the guiding frame 401 to reduce the friction between the soft-pack battery and the inclined surface of the guiding frame 401, thereby increasing the speed at which the soft-pack battery is sent into the fire extinguishing box 402 after passing through the guiding frame 401, that is, shortening the time when the soft-pack battery poses a threat to the equipment in the outside world.

[0030] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which does not affect the essence of the present invention.

Claims

1. A soft-pack battery tab welding device, characterized in that: It has a fixing frame (1), a conveying component (3) and a welding component (5) arranged in sequence along the length direction of the fixing frame (1). The conveying component (3) can convey and adjust the clamping tray holding the battery to cooperate with the welding component (5) to automatically weld the battery tabs. The conveying component (3) includes a transmission frame (309) and a cam divider (308) arranged on the fixing frame (1). Two conveying chains (302) distributed at intervals rotate circularly on the transmission frame (309). A pushing cylinder (305) driven by the cam divider (308) is arranged between the two conveying chains (302). A lifting tray (303) is arranged at the top telescopic end of the pushing cylinder (305) to lift the clamping tray and adjust the angle of the clamping tray. The welding component (5) includes two bearing frames (501) arranged on the fixing frame (1). A gantry frame for driving a laser welding part (505) is arranged on the bearing frame (501) to enable the laser welding part (505) to move horizontally and vertically to weld the corresponding tabs.

2. The soft-pack battery tab welding device according to claim 1, characterized in that: A supplementary welding component (2) is arranged on the fixing frame (1). The supplementary welding component (2) includes a supplementary welding frame (201) fixedly arranged on the fixing frame (1). A supplementary fixing frame (204) corresponding to the pushing cylinder (305) is arranged on the supplementary welding frame (201). A supplementary fixing cylinder (205) is fixedly arranged at the center of the supplementary fixing frame (204). A pushing plate (206) is fixedly arranged at the telescopic end of the supplementary fixing cylinder (205). The pushing plate (206) is elastically connected with a pushing and pressing plate (209) to cooperate with the lifting tray (303) to press and position the battery.

3. The soft-pack battery tab welding device according to claim 2, wherein: Four telescopic rods (207) are arranged at the four corners of the pushing plate (206). A shock-absorbing spring (208) is wound around each of the four telescopic rods (207). The shock-absorbing spring (208) is arranged between the pushing plate (206) and the pushing and pressing plate (209).

4. The soft-pack battery tab welding device according to claim 2, wherein: A fire prevention component (4) is arranged on the fixing frame (1). The fire prevention component (4) includes a guiding frame (401) and a monitoring component (403) for driving the two conveying chains (302) to rotate in the reverse direction. The guiding frame (401) is arranged on the fixing frame (1). The guiding frame (401) is provided with an inclined surface where the higher part corresponds to the conveying chain (302) and the lower part corresponds to a fire extinguishing box (402). The monitoring component (403) is connected with the supplementary welding frame (201) to convey the burning battery into the fire extinguishing box (402) for extinguishing when the monitoring component (403) detects that the tab welding part is on fire.

5. The soft-pack battery tab welding device according to claim 2, wherein: A longitudinal frame (202) is arranged on the supplementary welding frame (201). The longitudinal frame (202) is connected with a transverse frame (203) to drive the transverse and longitudinal displacement of the welding guiding component (6) connected to the transverse frame (203) to correspond to the tabs, so as to guide the laser welding part (505) to accurately correspond to the tabs and assist in laser welding.

6. The soft-pack battery tab welding device according to claim 5, characterized in that: The guiding and welding assembly (6) includes a guiding and welding frame (601) fixedly arranged on the transverse frame (203). Two welding nozzles (605) are arranged on the guiding and welding frame (601). The welding nozzles (605) can assist the laser welding part (505) in welding the tab. An adjustment platform (602) is arranged at the bottom of the guiding and welding frame (601). Four detectors (603) are arranged on the adjustment platform (602). The four detectors (603) are inclined so that the emitted laser can pass through the welding nozzles (605) to assist the welding nozzles (605) in accurately corresponding to the tabs. And a plurality of pipes for outputting protective gas and inhaling harmful gas are communicated with the welding nozzles (605).

7. The soft-pack battery tab welding device according to claim 6, characterized in that: Any one of the two welding nozzles (605) is fixedly connected to the guiding and welding frame (601), and the other welding nozzle (605) is connected to an adjusting assembly (604) arranged on the guiding and welding frame (601) to adjust the distance between the two welding nozzles (605).

8. The soft-pack battery tab welding device according to claim 1, characterized in that: Auxiliary cylinders are arranged at the corresponding positions on both sides of the conveying frame (309) and the lifting tray (303) in the rotating direction of the conveying chain (302). The auxiliary cylinders drive pressing wheels (304) to assist in positioning the position of the adjusted lifting tray (303).

9. The soft-pack battery tab welding device according to claim 1, wherein: A limiting block (307) is arranged at the edge of the conveying frame (309) facing away from the welding assembly (5) and corresponding to the lifting tray (303). The limiting block (307) is driven to move vertically by a limiting cylinder arranged on the conveying frame (309).

10. The soft-pack battery tab welding device according to claim 1, characterized in that: The gantry frame includes a variable-distance frame (502) arranged on the bearing frame (501). Two variable-distance frames (502) are connected to an auxiliary frame (503) to drive the longitudinal displacement of the auxiliary frame (503). The auxiliary frame (503) is connected to a positioning frame (504) to drive the transverse displacement of the positioning frame (504). And one end of the positioning frame (504) facing the conveying assembly (3) is connected to the laser welding part (505).

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