A battery module tab welding device

Abstract

This application relates to the field of laser welding technology, specifically a battery module tab welding device. The main waterline stacking device includes a base, a limiting plate, and a mechanical claw on the base for clamping the battery cell and end plate. Both the mechanical claw and the base are equipped with an automatic clamping mechanism. The bottom of the mechanical claw has a limiting rod corresponding to and connected to the limiting plate. Clamping plates for clamping the battery cell and end plate are installed on both sides of the mechanical claw away from the limiting rod. The clamping plates are driven by clamping cylinders. Both the limiting plate and the clamping plates clamp the middle section of the battery cell and end plate. The welding device includes a welding worktable, which is controlled by a gantry robot at the bottom of the welding device to weld the battery module. A quality inspection device includes a CCD camera and an auxiliary manual display screen for inspection. This application can effectively improve the welding accuracy of the battery module tabs while effectively avoiding the risk of battery module explosion during the welding process.

Description

Technical Field

[0001] This application relates to the field of laser welding technology, and in particular to a battery module tab welding device. Background Technology

[0002] Battery modules are the core components of the power system of new energy vehicles, and their quality affects the overall performance of the vehicle.

[0003] New energy vehicles have become a general trend in the automotive industry. Most new energy vehicles are pure electric vehicles or hybrid vehicles that use lithium-ion batteries as their energy storage device. Due to the inherent characteristics of lithium-ion batteries, hard-pack batteries (steel, aluminum, and plastic casings) generally pose a safety hazard of explosion. However, because hard-pack batteries have higher output power and longer lifespan, they hold an irreplaceable position in pure electric and hybrid vehicles.

[0004] Lithium-ion batteries typically have multiple sets of tabs, which are connected in series and parallel via connectors. These tabs can then be connected to other power systems (such as the power system of an electric vehicle). Currently, the traditional method involves manually pressing and assembling the tabs, then welding them to the connectors. This results in low welding efficiency, and manual pressing can lead to loose connections between the tabs and connectors, easily causing incomplete welds or even burn-through, resulting in a low weld pass rate. While automated methods for pressing and assembling tabs require multiple position monitoring steps, mechanical pressing and welding pose a risk of battery module explosion due to compression. Summary of the Invention

[0005] In order to overcome the problems existing in the prior art, this application provides a battery module tab welding device.

[0006] The battery module tab welding device provided in this application adopts the following technical solution:

[0007] A battery module tab welding device includes a main water line, on which a stacking device, a welding device, and a quality inspection device are sequentially distributed. The stacking device includes a base, limiting plates on two adjacent sides of the base, and mechanical claws on the top of the base for clamping battery cells and end plates. Both the mechanical claws and the base are equipped with automatic clamping mechanisms. The bottom of the mechanical claws has limiting rods corresponding to the limiting plates, and clamping plates for clamping battery cells and end plates are installed on both sides of the mechanical claws away from the limiting rods. The clamping plates are driven by clamping cylinders and have pressure sensors inside. The limiting plates and clamping plates clamp the battery cells and end plates in the middle section. A CCD addressing camera and an installation platform are also installed at the end of the stacking device. The welding device includes a welding worktable, which is controlled by a gantry robot at the bottom of the welding device to weld the battery modules. The quality inspection device includes a CCD camera and an auxiliary manual display screen for inspection.

[0008] By adopting the above technical solution, in the stacking device on the mainstream water line, operators place the battery cells and end plates on the base. The two sides are abutted by limiting plates on adjacent sides, and the battery cells and end plates are clamped by a mechanical gripper. Then, an automatic clamping mechanism clamps the battery cells on both the top and bottom sides. This automated design improves the efficiency of battery cell stacking and clamping, increasing the packaging efficiency and production capacity of battery modules. The limiting rod at the bottom of the mechanical gripper descends and connects with the limiting plate in the stacking device, effectively fixing the battery cells and end plates on two adjacent sides. The battery cells and end plates are clamped by clamping cylinders on two other sides, and pressure sensors monitor the clamping pressure in real time to prevent damage to the battery cells. Simultaneously, the limiting plate and clamping plate are clamped in the middle section of the battery cells and end plates, without affecting the automatic clamping mechanism's clamping installation of the clamped battery cells in both directions. A CCD addressing camera installed at the end of the stacking device can identify the position of the terminals of the stacked cells and provide feedback to the welding device. Busbars are installed on the stacked cells and end plates at the mounting platform to facilitate their entry into the welding device for welding to the terminals. In the welding device, a welding worktable mounted on a gantry robot arm at the bottom welds the tabs of the battery module. After welding, the CCD camera checks the welding accuracy, and a manual display screen is used for further verification to ensure the welding precision of the battery module.

[0009] Preferably, a pad for placing the battery cell is installed on the base, and the outer diameter of the pad is adapted to the outer diameter of the battery module. Placement racks are movably installed at both ends of the base, wherein the placement racks are used to place the end plates at both ends of the battery cell; the bottom of the top plate of the mechanical claw is provided with a pressure plate corresponding to the pad.

[0010] Preferably, the automatic clamping mechanism includes clamps respectively fitted around the pad and the pressure plate, wherein the side of the clamp away from the battery cell is driven by a drive ring to clamp the battery cell, and the drive ring is driven by a synchronously driven clamping cylinder.

[0011] By adopting the above technical solution, the pads on the base are used to place the battery cells and the pads. Clamps are fitted around the pads, so that when the clamps are not yet fitted, they are placed at the bottom of the battery cells and pads. Similarly, clamps are also fitted on the pressure plate at the top of the mechanical gripper. The battery cells and end plates are tidied and fixed around their perimeter by the clamping action of the mechanical gripper and the limiting plate. The top and bottom surfaces are tidied and fixed by the relative action of the top pressure plate and the bottom pads. At this time, the automatic clamp fitting mechanism is activated, fitting the two clamps located above and below the battery cells and end plates onto their respective upper and lower ends, stacking and fixing the battery cells. When the automatic clamp fitting mechanism is working, a synchronously driven fitting motor pushes a drive ring, thereby fitting the clamps onto the battery cells under the action of the drive ring. Since the size of the end plates at both ends of the battery cell is smaller than the battery cell, a placement rack is installed on the base to place the end plates. The placement rack extends from the sides of both ends of the base, which does not affect the normal operation of the automatic clamping mechanism. Furthermore, the placement rack is located below the limiting plate and the clamping plate, so it does not affect the stacking of the battery cell and the end plates.

[0012] Preferably, the base is slidably mounted on the main water line and driven by a power mechanism to move between the stacking device, welding device and quality inspection device, while the limiting plate is fixedly mounted on the main water line.

[0013] By adopting the above technical solution, the base can fit the stacked cells with clamps and package the battery modules in the stacking device. Under the action of the power mechanism, it can drive the welding and welding quality inspection, avoiding the process of stacking and packaging the battery modules for transportation, thus improving the welding accuracy and welding efficiency.

[0014] Preferably, a limiting hole is provided on the side of the limiting plate away from the battery cell and the end plate, and the limiting hole is connected and fixed with the limiting rod on the mechanical claw.

[0015] By adopting the above technical solution, the limiting holes opened on the limiting plate can be connected with the limiting rod on the mechanical claw, and the clamping plate on the mechanical claw can be used to organize and clamp the stack of battery cells and end plates, which facilitates the subsequent assembly of clamps.

[0016] Preferably, the welding worktable includes a base and a drive cylinder installed at the bottom of the base. A laser and a laser head are installed on the output rod of the drive cylinder. A focusing lens and an XY galvanometer are sequentially distributed in the laser head. The laser is embedded in the welding worktable, and the bottom of the laser is connected to the top of the laser head by a spring. The laser head is slidably mounted on the welding worktable.

[0017] By adopting the above technical solution, the output rod in the welding workbench is driven downward by the drive cylinder mounted on the base to press the electrode tab to be welded. The output rod is connected to the laser head by a laser and a spring at the bottom. This provides a certain buffer when the laser head touches the electrode tab for welding. This design reduces the need for external pressing and facilitates the identification of welding accuracy through the welding head contact design.

[0018] Preferably, a monitor is also fitted on the outside of the laser head, and a fire sprinkler is installed on the side of the base, extending to the end of the laser head, and the monitor is connected to the controller of the fire sprinkler via signal connection.

[0019] By adopting the above technical solution, the monitor on the outer casing of the laser head can monitor the status of the welding process in real time. When an abnormality is detected, the potential risk of combustion and explosion in the welding area can be extinguished by cooling and fire suppression through the corresponding fire sprinkler, accurately locating the danger and nipping it in the bud.

[0020] Preferably, the welding device is also equipped with an explosion-proof treatment device, including a sealing cover located on the side of the welding device and fire nozzles evenly distributed on the bottom surface of the welding device. The sealing cover is driven to rise and fall by synchronous drive rods at both ends of the welding device.

[0021] Preferably, the bottom surface of the sealing cover abuts against the top surface of the drive ring.

[0022] By adopting the above technical solution, the explosion-proof treatment device installed on the welding device seals the battery module through a liftable sealing cover. It is activated when the monitor continuously alarms and the fire sprinkler is working but cannot eliminate the danger, spraying fire-fighting material into the sealed placement tank. The bottom surface of the sealing cover and the top surface of the drive ring abut against each other to form a sealed space, which isolates the battery module from the outside world and prevents the dangerous situation from spreading.

[0023] Preferably, several limiting wheels are installed on both sides of the base, and the limiting wheels roll in the limiting groove on the side wall of the main water line under the action of the power mechanism.

[0024] By adopting the above technical solution, the two sides of the base roll in the groove inside the main waterline support through the limiting wheels, which ensures the stability of the base operation.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. During the stacking and assembly of battery modules, the mechanical claws, in conjunction with the limiting plates, clamp and organize the cells and end plates placed on the base, thereby facilitating the automatic clamping mechanism to automatically clamp the cells. Through the automated design, the efficiency of stacking cells and clamping them is improved, thereby increasing the packaging efficiency and production capacity of battery modules.

[0027] 2. When the base is in the stacking device, it can put the stacked cells into clamps and package the battery modules. Under the action of the power mechanism, it can drive the welding and welding quality inspection, avoiding the process of stacking and packaging the battery modules for transportation, thus improving the welding accuracy and welding efficiency.

[0028] 3. The explosion-proof treatment device installed on the welding equipment seals the battery module through a liftable sealing cover. It is activated when the monitor continuously alarms and the fire sprinkler is working but cannot eliminate the danger. Fire-fighting material is sprayed into the sealed placement tank. The bottom surface of the sealing cover and the top surface of the drive ring form a sealed space to isolate it from the outside world and prevent the dangerous situation from spreading. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a battery module electrode tab welding device;

[0030] Figure 2 yes Figure 1 Enlarged view of stacked mechanical grippers;

[0031] Figure 3 This is a schematic diagram of the rear structure of a battery module tab welding device;

[0032] Figure 4 This is a schematic diagram of the overall structure of the welding mechanism;

[0033] Figure 5 yes Figure 4 Enlarged view of the welding workbench.

[0034] Explanation of reference numerals in the attached drawings: 1. Main water line; 11. Limiting groove; 3. Stacking device; 31. Base; 311. Pad; 312. Placement rack; 32. Limiting plate; 321. Limiting perforation; 33. Mechanical claw; 331. Limiting rod; 332. Clamping plate; 333. Clamping cylinder; 334. Pressure plate; 34. CCD addressing camera; 35. Mounting platform; 4. Welding device; 41. Welding workbench; 411. Base; 4 12. Drive cylinder; 413. Laser; 414. Laser head; 415. Monitor; 416. Fire sprinkler; 42. Truss robot; 43. Explosion-proof treatment device; 431. Sealing cover; 432. Fire nozzle; 433. Synchronous drive rod; 5. Quality inspection device; 51. CCD camera; 52. Auxiliary manual display screen; 6. Automatic clamp fitting mechanism; 61. Clamp; 62. Drive ring; 63. Fitting cylinder. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0036] This application discloses a battery module tab welding device.

[0037] Reference Figures 1-5A battery module tab welding device 4 includes a main water line 1, on which a stacking device 3, a welding device 4, and a quality inspection device 5 are sequentially distributed. The stacking device 3 includes a base 31, limiting plates 32 on two adjacent sides of the base 31, and mechanical claws 33 on the top of the base 31 for clamping the battery cell and end plate. Both the mechanical claws 33 and the base 31 are equipped with an automatic clamping mechanism 6. The bottom of the mechanical claw 33 is provided with a limiting rod 331 corresponding to and connected to the limiting plate 32, and two sides of the mechanical claw 33 away from the limiting rod 331 are equipped with clamping devices for... The clamping plate 332 clamps the battery cell and the end plate. The clamping plate 332 is driven by the clamping cylinder 333 and is equipped with a pressure sensor. The limiting plate 32 and the clamping plate 332 are both clamped in the middle section of the battery cell and the end plate. The stacking device 3 is also equipped with a CCD addressing camera 34 and an installation platform 35 at the end. The welding device 4 includes a welding worktable 41, which is controlled by a gantry robot 42 at the bottom of the welding device 4 to weld the battery module. The quality inspection device 5 includes a CCD camera 51 and an auxiliary manual display screen 52 for inspection. In the stacking device 3 on the main water line 1, the operator places the battery cell and end plate on the base 31. The two sides are abutted by the limiting plates 32 on the adjacent side surfaces. Under the action of the mechanical claw 33, the battery cell and end plate are clamped and then the clamping automatic clamping mechanism 6 clamps the upper and lower sides of the battery cell with clamps 61. Through the automated design, the efficiency of battery cell stacking and clamping 61 is improved, and the packaging efficiency and production capacity of battery modules are improved. The limiting rod 331 at the bottom of the mechanical claw 33 descends and connects with the limiting plate 32 in the stacking device 3, thereby forming two adjacent faces of the mechanical claw 33 to effectively fix the battery cell and end plate. The battery cell and end plate are then clamped by clamping cylinders 333 on the other two faces, and pressure sensors monitor the clamping pressure in real time to prevent damage to the battery cell. Simultaneously, the limiting plate 32 and clamping plate 332 are clamped in the middle section of the battery cell and end plate, without affecting the automatic clamping mechanism 6 in both the upper and lower directions to install the clamped battery cell with clamps 61. A CCD addressing camera 34 installed at the end of the stacking device 3 can identify the position of the electrode post of the stacked battery cell and feed it back to the welding device 4. Furthermore, a busbar is installed on the stacked battery cell and end plate at the mounting platform 35 to facilitate its entry into the welding device 4 for welding with the electrode post. In the welding device 4, the electrode tabs of the battery module are welded by the welding worktable 41 mounted on the bottom of the truss robot 42. After the welding is completed, the welding accuracy is detected by the CCD camera 51 and verified again by the auxiliary manual display screen 52 to ensure the welding accuracy of the battery module.

[0038] Reference Figures 1-5The base 31 is equipped with pads 311 for placing battery cells, and the outer diameter of the pads 311 is adapted to the outer diameter of the battery module. Placement racks 312 are movably installed at both ends of the base 31, where the placement racks 312 are used to place the end plates at both ends of the battery cells. The bottom of the top plate of the mechanical claw 33 is provided with a pressure plate 334 corresponding to the pads 311. The automatic clamping mechanism 6 includes clamps 61 respectively fitted around the pads 311 and the pressure plate 334. The side of the clamps 61 away from the battery cells and end plates is driven by a drive ring 62 to clamp the battery cells. The drive ring 62 is driven by a synchronously driven clamping cylinder 63. The pads 311 on the base 31 are used to place the battery cells and the pads 311. The clamps 61 are fitted around the pads 311, so that when the clamps 61 are not being fitted, they are placed at the bottom of the battery cells and the pads 311. Similarly, clamps 61 are also fitted on the pressure plate 334 at the top of the mechanical claw 33. The battery cell and end plate are secured around their perimeter by the mechanical gripper 33 and the limiting plate 32. The top pressure plate 334 and the bottom pad 311 further secure their top and bottom surfaces. At this point, the automatic clamping mechanism 6 is activated, fitting two clamps 61 located above and below the battery cell onto its upper and lower ends, thus stacking and securing the battery cell and end plate. The automatic clamping mechanism 6 operates by using a synchronously driven clamping motor to push the drive ring 62, which in turn fits the clamps 61 onto the battery cell. Since the end plates at both ends of the battery cell are smaller than the battery cell itself, a placement rack 312 is installed on the base 31 to hold the end plates. The placement rack 312 extends from the sides of both ends of the base 31, ensuring it does not interfere with the normal operation of the automatic clamping mechanism 6. Furthermore, the placement rack 312 is located below the limiting plate 32 and the clamping plate 332, so it does not affect the stacking of the battery cell and end plate.

[0039] Reference Figures 1-5 The base 31 is slidably mounted on the main water line 1 and is driven by a power mechanism to move between the stacking device 3, the welding device 4, and the quality inspection device 5. The limiting plate 32 is fixedly mounted on the main water line 1. When the base 31 is in the stacking device 3, it can fit the stacked cells into the clamps 61 and package the battery modules. Under the action of the power mechanism, it can drive the battery modules to perform welding and welding quality inspection, avoiding the need for transporting the stacked and packaged battery modules, thus improving the welding accuracy and welding efficiency.

[0040] Reference Figures 1-5 A limiting hole 321 is provided on the side of the limiting plate 32 away from the battery cell and end plate. The limiting hole 321 is connected and fixed with the limiting rod 331 on the mechanical claw 33. The limiting hole 321 on the limiting plate 32 can be connected with the limiting rod 331 on the mechanical claw 33, and together with the clamping plate 332 on the mechanical claw 33, it can organize and clamp the stacked battery cell and end plate, which facilitates the subsequent assembly of the clamp 61.

[0041] Reference Figures 1-5 The welding worktable 41 includes a base 411 and a drive cylinder 412 mounted on the bottom of the base 411. A laser 413 and a laser head 414 are mounted on the output rod of the drive cylinder 412. The laser head 414 contains a focusing lens for beam focusing and an XY galvanometer. The laser 413 is embedded within the welding worktable 41, and its bottom is connected to the top of the laser head 414 via a spring. The laser head 414 is slidably mounted on the welding worktable 41. The output rod of the welding worktable 41 is driven downwards by the drive cylinder 412 mounted on the base 411 to press the tab to be welded. The output rod, driven by the laser 413, and connected to the laser head 414 via a spring at its bottom, provides cushioning when the laser head 414 contacts the tab for welding. This design reduces external pressing operations and facilitates the identification of welding precision through the contact design of the welding head.

[0042] Reference Figures 1-5 A monitor 415 is also fitted around the outside of the laser head 414, and a fire sprinkler 416 is installed on the side of the base 411, extending to the end of the laser head 414. The monitor 415 is connected to the controller signal of the fire sprinkler 416. The monitor 415 fitted around the laser head 414 can monitor the status of the welding process in real time. When an abnormality is detected, it can cool and extinguish the potential fire and explosion risks in the welding area through the corresponding fire sprinkler 416, accurately locating the danger and nipping it in the bud.

[0043] Reference Figures 1-5 The welding device 4 is also equipped with an explosion-proof treatment device 43, including a sealing cover 431 located on the side of the welding device 4 and fire nozzles 432 evenly distributed on the bottom surface of the welding device 4. The sealing cover 431 is driven to rise and fall by synchronous drive rods 433 at both ends of the welding device 4. The bottom surface of the sealing cover 431 abuts against the top surface of the drive ring 62. The explosion-proof treatment device 43 installed on the welding device 4 seals the battery module through the liftable sealing cover 431, and is activated when the monitor 415 continuously alarms and the fire nozzles 416 are working but cannot eliminate the danger, spraying fire-fighting materials into the sealed placement tank. The sealing cover 431 abuts against the top surface of the drive ring 62 to form a sealed space, isolating the battery module from the outside world and preventing the spread of danger.

[0044] Reference Figure 1 and Figure 2Several limiting wheels are installed on both sides of the base 31. Under the action of the power mechanism, the limiting wheels roll in the limiting groove 11 on the side wall of the main water line 1. The rolling of the limiting wheels on both sides of the base 31 in the groove inside the support of the main water line 1 ensures the stability of the base 31 during operation.

[0045] Working principle: During operation, the base 31 is first moved to the stacking device 3 area, and the battery cell and end plate assembly are placed on the pad 311 and placement frame 312 of the base 31. The robotic arm mechanism lowers the robotic claw 33 onto the base 31, and the limiting plates 32 on the adjacent side surfaces abut against both sides of the battery cell and end plate assembly. Under the action of the robotic claw 33, the battery cell and end plate are clamped, and the pressure sensor on the clamping plate 332 monitors the clamping pressure in real time. Finally, the clamping automatic fitting mechanism 6 clamps the upper and lower sides of the battery cell with clamps 61 and fixes the end plate. The battery modules, stacked and assembled at both ends of the battery cell, are placed on the base 31. Under the action of the power mechanism, they are identified by the CCD addressing camera 34 and then installed on the mounting platform 35 to install the busbars. They then enter the bottom of the welding device 4 for welding. The welding worktable 41 welds several tabs on the battery module under the action of the welding robot. After welding is completed, the quality inspection device 5 detects the welding quality through the CCD camera 51, and at the same time, it is manually inspected by the auxiliary manual display screen 52. The battery modules that pass the inspection enter the next production line.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A battery module tab welding device, comprising a main water line (1), characterized in that: The main water line (1) includes a stacking device (3), a welding device (4), and a quality inspection device (5) arranged in sequence. The stacking device (3) includes a base (31), limiting plates (32) on the two adjacent sides of the base (31), and a mechanical claw (33) on the top of the base (31) for clamping the battery cell and the end plate. Both the mechanical claw (33) and the base (31) are equipped with an automatic clamping mechanism (6). The bottom of the mechanical claw (33) is provided with a limiting rod (331) that is connected to the limiting plate (32), and both sides of the mechanical claw (33) away from the limiting rod (331) are equipped with clamping devices for clamping the battery cell and the end plate. A clamping plate (332) clamps the battery cell and the end plate. The clamping plate (332) is driven by a clamping cylinder (333), and a pressure sensor is provided inside the clamping plate (332). The limiting plate (32) and the clamping plate (332) are both clamped in the middle section of the battery cell and the end plate. The stacking device (3) is also equipped with a CCD addressing camera (34) and an installation platform (35) at the end. The welding device (4) includes a welding workbench (41), which is controlled by a gantry robot (42) at the bottom of the welding device (4) to weld the battery module. The quality inspection device (5) includes a CCD addressing camera (34) and an installation platform (35). A CD camera (51) and an auxiliary manual display screen (52) are provided; a pad (311) for placing battery cells is installed on the base (31), and the outer diameter of the pad (311) is adapted to the outer diameter of the battery module; a placement frame (312) is movably installed at both ends of the base (31), wherein the placement frame (312) is used to place the end plates at both ends of the battery cells; a pressure plate (334) corresponding to the pad (311) is provided at the bottom of the top plate of the mechanical claw (33); the automatic clamping mechanism (6) includes clamps (61) respectively fitted around the pad (311) and the pressure plate (334), wherein the clamps (61) are far away from the battery module. One side of the core is driven by a drive ring (62) to drive the clamp (61) to mount the battery cell. The drive ring (62) is driven by a synchronously driven mounting cylinder (63). The base (31) is slidably mounted on the main water line (1) and is driven by a power mechanism to move between the stacking device (3), the welding device (4), and the quality inspection device (5). The limiting plate (32) is fixedly mounted on the main water line (1). The limiting plate (32) has a limiting hole (321) on the side away from the battery cell and the end plate. The limiting hole (321) is connected and fixed with the limiting rod (331) on the mechanical claw (33).

2. The battery module tab welding apparatus of claim 1, wherein: The welding workbench (41) includes a base (411) and a drive cylinder (412) installed at the bottom of the base (411). A laser (413) and a laser head (414) are installed on the output rod of the drive cylinder (412). A focusing lens and an XY galvanometer are arranged in sequence in the laser head (414). The laser (413) is embedded in the welding workbench (41), and the bottom of the laser (413) is connected to the top of the laser head (414) by a spring. The laser head (414) is slidably installed on the welding workbench (41).

3. The battery module tab welding apparatus of claim 2, wherein: A monitor (415) is also fitted on the outside of the laser head (414), and a fire sprinkler (416) is installed on the side of the base (411). The fire sprinkler (416) extends to the end of the laser head (414), and the monitor (415) is connected to the controller signal of the fire sprinkler (416).

4. The battery module tab welding apparatus of claim 1, wherein: The welding device (4) is also equipped with an explosion-proof treatment device (43). The explosion-proof treatment device (43) includes a sealing cover (431) located on the side of the welding device (4) and fire nozzles (432) evenly distributed on the bottom surface of the welding device (4). The sealing cover (431) is driven to rise and fall by synchronous drive rods (433) at both ends of the welding device (4).

5. The battery module tab welding apparatus of claim 4, wherein: The bottom surface of the sealing cover (431) abuts against the top surface of the drive ring (62).

6. The battery module tab welding apparatus of claim 1, wherein: Several limiting wheels are installed on both sides of the base (31), and the limiting wheels roll in the limiting groove (11) on the side wall of the main water line (1) under the action of the power mechanism.

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