A laser welding device for lithium battery production

Abstract

This invention discloses a laser welding device for lithium battery production, specifically relating to the technical field of welding devices. It includes an operating table with symmetrically arranged transfer components on the front upper side and two symmetrically arranged cleaning components on the same front upper side. Protective components are provided on opposite sides of the two transfer components. A welding component is fixedly connected to the upper upper side of the operating table, and symmetrically arranged moving components are located below the welding component. Air jet components are located behind both moving components. This invention uses a rack and pinion mechanism combined with a circular brush to uniformly grind the middle portion of the upper and lower ends of aluminum alloy electrode tabs, effectively removing oxide layers and microparticles. Simultaneously, the combination of two airbags and other structures enables directional flow of argon gas, enveloping the electrode tabs in an argon atmosphere. This prevents rapid oxidation of the cleaned surface after grinding and carries away grinding dust with the airflow, avoiding dust contamination of the welding area.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and in particular to a laser welding device for lithium battery production. Background Technology

[0002] Lithium batteries are batteries that use lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. Lithium battery production is a complex and precise process involving multiple stages such as material preparation, cell manufacturing, battery assembly and testing.

[0003] In lithium battery production, the welding of the cover plate to the positive electrode aluminum alloy tab is a key process in battery packaging, which directly affects the battery's conductivity, sealing, and safety.

[0004] Chinese Patent Publication No. CN114346427A discloses a laser welding device for lithium battery production. The device includes a welding frame and a welding box. The welding box includes a lid with mounting holes and welding blocks. The mounting holes are used to mount connecting pieces. The welding frame includes a pressing component, a molding component, and a laser welding head. The pressing component is used to mount the connecting pieces into the mounting holes and connect them to the lithium battery. The molding component is used to fix the connecting pieces to the mounting holes. The laser welding head is used to weld the welding blocks to the connecting pieces. This patent can effectively weld lithium batteries.

[0005] However, the above-mentioned device cannot achieve the effect of simultaneously cleaning the aluminum alloy tabs before welding and protecting the grinding area and the ground aluminum alloy tabs by using the directional flow of nitrogen. It also cannot elastically press the aluminum alloy tabs during welding and form an argon rectangular cavity to keep the welded parts in an argon atmosphere before and after welding. Summary of the Invention

[0006] The main objective of this invention is to provide a laser welding device for lithium battery production, which can effectively solve the problem of not being able to simultaneously protect the grinding area and the ground aluminum alloy tabs by using directional flow of nitrogen gas while grinding and cleaning the aluminum alloy tabs before welding.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A laser welding device for lithium battery production includes an operating table. A transfer component is symmetrically arranged on the front side of the upper end of the operating table. Two cleaning components are symmetrically arranged on the front side of the upper end of the operating table. A protective component is arranged on each of the two transfer components on a side away from each other. A welding component is fixedly connected to the upper end of the operating table. A moving component is symmetrically arranged on the lower part of the welding component. An air jet component is arranged on the rear side of each of the two moving components.

[0009] Preferably, a vacuum adsorption seat is fixedly connected to the rear side of the upper end of the operating platform, rectangular guide rails are symmetrically fixedly connected to the front side of the upper end of the operating platform, and a pad is fixedly connected to the middle of the front side of the upper end of the operating platform.

[0010] Preferably, the transfer assembly includes a push block slidably connected to the left end of a rectangular guide rail, a hydraulic cylinder is fixedly connected to the upper end of the rectangular guide rail, the output end of the hydraulic cylinder is fixedly connected to the front end of the push block, an adsorption rod is symmetrically fixedly connected to the left end of the push block, a bending rod is fixedly connected to the front end of the push block, a slider is fixedly connected to the front side of the left end of the bending rod, and an arc-shaped groove is provided on the upper end of the slider.

[0011] Preferably, a fixed plate is fixedly connected to the upper end of the operating platform, a stop block is fixedly connected to the middle of the right end of the fixed plate, a rack is slidably connected to the lower end of the fixed plate, a rectangular groove is opened at the right end of the rack, the outer surface of the slider is slidably connected to the inner surface of the rectangular groove, a rotating plate is rotatably connected to the front side of the right end of the rack, a spring is fixedly connected to the front side of the lower end of the rotating plate, and a limit roller is rotatably connected to the rear side of the lower end of the rotating plate, the lower arc surface of the limit roller is in close contact with the inner surface of the arc groove.

[0012] Preferably, the cleaning assembly includes three gears that mesh with the outer surface of the rack, each of the three gears has a rotating roller fixedly connected to its middle, and each of the three rotating rollers has a circular brush fixedly connected to its lower end.

[0013] Preferably, the protection component includes a vertical plate fixedly connected to the upper end of the operating table, an airbag fixedly connected to the front end of the vertical plate, a push plate fixedly connected to the front end of the airbag, a push rod fixedly connected to the left end of the push plate, a hose fixedly connected to the rear side of the outer surface of the vertical plate, and a nozzle fixedly connected to the end of the hose away from the vertical plate.

[0014] Preferably, the welding assembly includes a hydraulic cylinder two fixedly connected to the upper end of the operating table, a horizontal plate one fixedly connected to the output end of the hydraulic cylinder two, a laser welding head fixedly connected to the middle of the lower end of the horizontal plate, four telescopic rods symmetrically fixedly connected to the lower end of the horizontal plate, a spring two sleeved on the outer surface of each of the four telescopic rods, a circular plate fixedly connected to the lower end of the telescopic rods and the spring two on the same side, and a silicone pad fixedly connected to the lower end of the circular plate.

[0015] Preferably, the moving component includes a second vertical plate that is slidably connected to the upper end of the operating table. The second vertical plate has limit grooves at both its front and rear ends. Z-shaped rollers are slidably connected to the inner surfaces of the two limit grooves. The two Z-shaped rollers are fixedly connected to a first horizontal plate. A U-shaped plate is fixedly connected to the upper left side of the second vertical plate.

[0016] Preferably, the jet assembly includes an airbag two fixedly connected to the upper end of the operating table, a horizontal plate two fixedly connected to the upper end of the airbag two, and a slot provided at the upper end of the horizontal plate two. When the Z-shaped roller located on the rear side descends a certain distance, the outer surface of the Z-shaped roller is in close contact with the inner surface of the slot. A spring three is fixedly connected to one side of the lower end of the horizontal plate two and the upper end of the operating table. A hose two is fixedly connected to one side of the outer surface of the airbag two. A plurality of nozzles are fixedly connected to the end of the hose two away from the airbag two. The plurality of nozzles are fixedly connected to the middle of the left end of the U-shaped plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This invention, through the cooperation of a transfer component and a cleaning component, simultaneously grinds the middle part of the upper and lower ends of the aluminum alloy electrode tab during the transfer process in preparation for welding. This ensures the purity of the welding contact surface and avoids problems such as incomplete welding connections and increased resistance caused by impurities. During the grinding process, two protective components work together to form a directional argon gas flow, which evenly covers the grinding area. At the same time, the directional flow of the gas flow carries the grinding dust forward, preventing dust accumulation or drift towards the welding area. Before welding, the welding component, in conjunction with two moving components and two jet components, forms a sealed argon atmosphere in the welding area. Utilizing the property of argon gas to automatically sink, the welding area between the electrode tab and the cover plate is completely surrounded. Compared with an open environment, this significantly reduces the intrusion of external air, provides a stable inert gas atmosphere for the welding process, ensures extremely low oxygen content during welding, and prevents defects such as porosity and cracks in the weld.

[0019] 2. This invention, during the transfer of aluminum alloy tabs by four adsorption rods, uses a rack and a circular brush to uniformly polish the middle part of the upper and lower ends of the aluminum alloy tabs, effectively removing oxide layers and impurities such as microparticles, thus avoiding poor welding due to surface impurities. At the same time, during the transfer of aluminum alloy tabs, two airbags and two nozzles work together to achieve directional flow of argon gas, enveloping the tabs in an argon atmosphere. This not only prevents the clean surface after polishing from oxidizing rapidly, but also carries away polishing dust with the airflow, avoiding dust contamination of the welding area.

[0020] 3. This invention uses four silicone pads to evenly press the aluminum alloy electrode tabs and cover plate together with elastic buffering force. This not only avoids deformation of the aluminum alloy electrode tabs caused by rigid extrusion, but also eliminates displacement caused by vibration during welding. In addition, two Z-shaped rollers, together with vertical plate two and U-shaped plate, form a rectangular cavity around the welding area before welding. At the same time, with the second airbag, argon gas is injected into the rectangular cavity, so that the aluminum alloy electrode tabs are always in argon protection during the welding process. This ensures that the aluminum alloy electrode tabs do not come into contact with air during the welding process, thereby inhibiting the formation of pores. At the same time, uniform heat conduction reduces stress concentration during cooling. The relatively sealed argon atmosphere can also reduce the heat-affected zone and prevent the cover plate from deforming due to overheating. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall internal structure of the present invention;

[0023] Figure 3 This is a partial structural diagram of the present invention;

[0024] Figure 4 This is a schematic diagram of the transfer component structure of the present invention;

[0025] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0026] Figure 6 This is a schematic diagram of the transfer component of the present invention from another perspective;

[0027] Figure 7 This is a partial structural diagram of the transfer component of the present invention;

[0028] Figure 8 This is a schematic diagram of the protective component structure of the present invention;

[0029] Figure 9 This is a schematic diagram of the cleaning component structure of the present invention;

[0030] Figure 10 This is a schematic diagram of the welding assembly structure of the present invention;

[0031] Figure 11 This is a schematic diagram of the mobile component structure of the present invention;

[0032] Figure 12 This is a schematic diagram of the jet assembly structure of the present invention.

[0033] In the diagram: 1. Operating table; 11. Vacuum adsorption seat; 12. Rectangular guide rail; 13. Pad; 2. Transfer assembly; 21. Hydraulic cylinder one; 22. Push block; 23. Adsorption rod; 24. Fixing plate; 241. Stop block; 25. Rack; 251. Rectangular groove; 252. Rotating plate; 253. Spring one; 254. Limiting roller; 26. Bending rod; 27. Slider; 271. Arc groove; 3. Protection assembly; 31. Push rod; 32. Push plate; 33. Airbag one; 34. Vertical plate one; 35. Hose one; 36. Nozzle; 4. Cleaning assembly; 41. Rotary roller; 42. Gear; 43. Circular brush; 5. Welding assembly; 51. Hydraulic cylinder II; 52. Horizontal plate I; 53. Telescopic rod; 54. Circular plate; 55. Silicone pad; 56. Spring II; 57. Laser welding head; 6. Air jet assembly; 61. Horizontal plate II; 611. Slot; 62. Spring III; 63. Airbag II; 64. Hose II; 65. Nozzle; 7. Moving assembly; 71. Vertical plate II; 711. Limiting groove; 72. Z-shaped roller; 73. U-shaped plate. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0035] Example 1, as Figure 1 and Figure 2 As shown, a laser welding device for lithium battery production includes an operating table 1. A transfer component 2 is symmetrically arranged on the front side of the upper end of the operating table 1. Two cleaning components 4 are symmetrically arranged on the front side of the upper end of the operating table 1. A protective component 3 is arranged on each side of the two transfer components 2 away from each other. A welding component 5 is fixedly connected to the upper end of the operating table 1. A moving component 7 is symmetrically arranged below the welding component 5. A jetting component 6 is arranged on the rear side of each of the two moving components 7.

[0036] When welding the cover plate of a lithium battery (taking a square shape as an example) and the positive aluminum alloy tab, the cover plate is adsorbed and fixed by the operating table 1. At the same time, the aluminum alloy tab to be welded is adsorbed and fixed by two transfer components 2. When the two transfer components 2 move the aluminum alloy tab to the inner surface above the cover plate, the transfer components 2 cooperate with the cleaning components 4 on the same side to simultaneously grind the middle of the upper and lower ends of the aluminum alloy tab to remove impurities from the surface of the tab. During the transfer and grinding process, the protective components 3 located on the rear continuously blow argon gas and the protective components 3 located on the front continuously suck in air, forming a directional flow of argon gas through the aluminum alloy tab and then through the grinding area. This ensures that the aluminum alloy tab is always within the argon gas protection range when grinding and cleaning the surface of the tab. At the same time, the airflow carries the grinding dust, causing it to flow forward in a directional direction and not drift towards the welding area, thus affecting the subsequent welding effect.

[0037] Similarly, during the welding preparation process, as the welding component 5 descends, it works in conjunction with two moving components 7 to form a rectangular cavity around the aluminum alloy tab and the cover plate to be welded. Then, it works in conjunction with two jetting components 6 to inject argon gas into the rectangular sealed cavity before welding, ensuring that the aluminum alloy tab and the cover plate are always under inert gas protection during welding, thereby further improving the welding quality.

[0038] In the operation of this embodiment, the transfer component 2 and the cleaning component 4 work together to simultaneously grind the middle of the upper and lower ends of the aluminum alloy electrode tabs during the transfer process in preparation for welding. This ensures the purity of the welding contact surface and avoids problems such as poor welding connection and increased resistance caused by impurities. During the grinding process, the two protective components 3 work together to form a directional argon gas flow, which evenly covers the grinding area. At the same time, the directional flow of the gas flow drives the grinding dust forward and avoids dust accumulation or drifting towards the welding area. Before welding, the welding component 5 works with the two moving components 7 and the two jet components 6 to form a sealed argon atmosphere in the welding area. Utilizing the property of argon gas to automatically sink, the welding area between the electrode tab and the cover plate is completely surrounded. Compared with an open environment, this can significantly reduce the intrusion of external air and provide a stable inert gas atmosphere for the welding process. This ensures that the oxygen content is extremely low during welding and prevents defects such as porosity and cracks from appearing at the welding part.

[0039] Example 2: Based on Example 1, this example aims to achieve the effect of simultaneously protecting the polished area and the polished aluminum alloy tabs by using directional flow of nitrogen gas while polishing and cleaning the aluminum alloy tabs before welding.

[0040] See Figure 3 A vacuum adsorption seat 11 is fixedly connected to the rear side of the upper end of the operating table 1. A rectangular guide rail 12 is symmetrically fixedly connected to the front side of the upper end of the operating table 1. A pad 13 is fixedly connected to the middle of the front side of the upper end of the operating table 1.

[0041] The vacuum adsorption seat 11 mentioned above is a conventional design in the prior art. With the cooperation of the vacuum adsorption seat 11, the adsorption and desorption of the lower end of the lithium battery cover can be automatically controlled. The specific structural composition and working principle will not be described in detail in this solution.

[0042] Several aluminum alloy tabs to be welded are placed on the upper rear side of the aforementioned pad 13. In conjunction with the existing conveying components, when an aluminum alloy tab is moved to prepare for welding, a new aluminum alloy tab will be pushed backward a certain distance when it is conveyed to the upper end of the pad 13.

[0043] When preparing the welding cover plate and aluminum alloy tabs, the cover plate is fixed by adsorption using the vacuum adsorption seat 11.

[0044] See Figure 4 , Figure 5 , Figure 6 and Figure 7 The transfer assembly 2 includes a push block 22 that is slidably connected to the left end of a rectangular guide rail 12. A hydraulic cylinder 21 is fixedly connected to the upper end of the rectangular guide rail 12. The output end of the hydraulic cylinder 21 is fixedly connected to the front end of the push block 22. An adsorption rod 23 is symmetrically fixedly connected to the left end of the push block 22. A bending rod 26 is fixedly connected to the front end of the push block 22. A slider 27 is fixedly connected to the front side of the left end of the bending rod 26. An arc groove 271 is opened on the upper end of the slider 27.

[0045] The aforementioned adsorption rod 23 is a conventional technical means in the prior art. Through the coordinated operation of the adsorption rod 23, the aluminum alloy tab can be adsorbed and fixed. At the same time, during the movement of the four adsorption rods 23 and the aluminum alloy tab, the aluminum alloy tab will not be displaced. The specific structure and working principle of the adsorption rod 23 will not be described in detail in this solution.

[0046] When preparing to transfer the aluminum alloy tab to the welding area, the four adsorption rods 23 on the upper end of the aluminum alloy tab are activated, so that the four adsorption rods 23 work together to adsorb and fix the aluminum alloy tab.

[0047] After the four adsorption rods 23 are fixed with the aluminum alloy tabs, the hydraulic cylinder 21 is activated. Then, the output end of the hydraulic cylinder 21 pushes the push block 22 backward, causing the push block 22 to drive the two adsorption rods 23 on the same side, as well as the aluminum alloy tabs and the bending rod 26, to slide backward along the left end of the rectangular guide rail 12. During the backward sliding of the bending rod 26, the slider 27 moves simultaneously.

[0048] See Figure 5 and Figure 7 A fixed plate 24 is fixedly connected to the upper end of the operating table 1. A stop block 241 is fixedly connected to the middle of the right end of the fixed plate 24. A rack 25 is slidably connected to the lower end of the fixed plate 24. A rectangular groove 251 is opened at the right end of the rack 25. The outer surface of the slider 27 is slidably connected to the inner surface of the rectangular groove 251. A rotating plate 252 is rotatably connected to the front side of the right end of the rack 25. A spring 253 is fixedly connected to the front side of the lower end of the rotating plate 252. A limit roller 254 is rotatably connected to the rear side of the lower end of the rotating plate 252. The lower arc surface of the limit roller 254 is in close contact with the inner surface of the arc groove 271.

[0049] By compressing the spring 253 in advance, when the spring 253 is fixedly connected to the rotating plate 252, the spring 253 pushes the front end of the rotating plate 252 upward, thereby causing the rotating plate 252 to be in an inclined state.

[0050] During the process of the bending rod 26 driving the slider 27 to move backward, the lower arc surface of the limiting roller 254 is in close contact with the inner surface of the arc groove 271. As a result, during the movement of the slider 27, the limiting roller 254, the rotating plate 252 and the rack 25 will move backward as a whole, while the rack 25 moves backward along the fixed plate 24.

[0051] See Figure 9 The cleaning component 4 includes three gears 42 that mesh with the outer surface of the rack 25. A rotating roller 41 is fixedly connected to the middle of each of the three gears 42, and a round brush 43 is fixedly connected to the lower end of each of the three rotating rollers 41.

[0052] The three upper rollers 41 are rotatably connected to the left end of the fixed plate 24, and the three lower rollers 41 are rotatably connected to the upper end of the operating table 1.

[0053] Furthermore, as the aluminum alloy tabs are fixed by the four adsorption rods 23 and move backward in conjunction with the slider 27 and rack 25 through the output end of the hydraulic cylinder 21, the rack 25 drives the three gears 42 on the same side to rotate. In turn, the three gears 42 drive the coaxial roller 41 and the round brush 43 to rotate continuously. As the aluminum alloy tabs move backward, the three round brushes 43 rotate continuously to polish the upper and lower ends of the aluminum alloy tabs, thereby removing the oxide layer and small particles and other impurities from the surface of the aluminum alloy tabs.

[0054] See Figure 8 The protective component 3 includes a vertical plate 34 fixedly connected to the upper end of the operating table 1, an airbag 33 fixedly connected to the front end of the vertical plate 34, a push plate 32 fixedly connected to the front end of the airbag 33, a push rod 31 fixedly connected to the left end of the push plate 32, a hose 35 fixedly connected to the rear side of the outer surface of the vertical plate 34, and a nozzle 36 fixedly connected to the end of the hose 35 away from the vertical plate 34.

[0055] The airbag 33 located on the right side is connected to an external argon gas source. A one-way inlet valve is provided on the inner surface of the connection between the airbag 33 and the external argon gas source. At the same time, a one-way outlet valve is provided on the inner surface of the connection between the airbag 33 and the hose 35 located on the rear side. This ensures that argon gas can only enter the airbag 33 through the argon gas source and then flow to the inner surface of the hose 35 located on the rear side, and cannot flow in the opposite direction.

[0056] The airbag 33 located on the left side is connected to the external gas collection tank, and a one-way air outlet valve is provided at the connection between the airbag 33 and the external gas collection tank. A one-way air inlet valve is provided between the hose 35 located on the front side and the airbag 33 located on the left side, so that the external gas can only enter the airbag 33 through the hose 35 and then flow to the external gas collection tank, and cannot flow in the opposite direction.

[0057] The outer surface of the above-mentioned nozzle 36 is provided with several air ports.

[0058] The push rod 31 on the right is fixedly connected to the front end of the push block 22 on the right, and the push rod 31 on the left is fixedly connected to the rear left end of the rack 25 on the left.

[0059] Similarly, when the four adsorption rods 23 fix the aluminum alloy tabs and move backward through the output end of the hydraulic cylinder 21 in conjunction with the slider 27 and rack 25, etc.:

[0060] As the push block 22 on the right moves backward, it will drive the push rod 31 and push plate 32 on the right to move backward at the same time, which will squeeze the airbag 33 on the right. At this time, the argon gas inside the airbag 33 on the right flows through the inner surface of the hose 35 on the rear side to the nozzle 36 and is sprayed forward.

[0061] As the output end of the hydraulic cylinder 21 on the left side drives the push block 22 and rack 25 on the same side to move backward, it also drives the push rod 31 and push plate 32 on the left side to move backward at the same time. This will stretch the airbag 33 on the left side, and the gas on the outer surface of the nozzle 36 will enter the nozzle 36 and pass through the hose 35 on the front side and the airbag 33 on the left side into the external gas collection tank.

[0062] Furthermore, through the cooperation of two airbags 33, hose 35, and nozzle 36, during the process of transferring the aluminum alloy tab and polishing its upper and lower surfaces, the nozzle 36 located on the rear side continuously sprays argon gas, while the nozzle 36 located on the front side continuously draws in gas, thereby promoting the directional flow of argon gas from back to front. As the aluminum alloy tab is moved and polished, the polishing process and the polished aluminum alloy tab are further enveloped in an argon atmosphere, preventing the newly exposed clean aluminum alloy tab surface from being rapidly oxidized in the air. At the same time, the directional flow of argon gas can also directionally carry away the dust generated during the polishing process, preventing the polishing dust from drifting onto the cover plate or tab to be welded, thus ensuring the quality of subsequent welding.

[0063] See Figure 7 As the push block 22, bending rod 26, and slider 27 drive the four adsorption rods 23 and aluminum alloy tabs to move backward, when the aluminum alloy tabs move backward to disengage from the two rotating rollers 41 located on the rear side, the rack 25 moves backward to the upper end of the rotating plate 252 and begins to contact the lower end of the stop block 241. As the rack 25 continues to move backward, it presses the rotating plate 252 downward through the cooperation of the stop block 241, which in turn compresses the spring 253, causing the rotating plate 252 to rotate around its own center. During the rotation of the rotating plate 252, the limiting roller 254 moves upward and gradually disengages from the inner surface of the arc groove 271.

[0064] After the lower arc surface of the limiting roller 254 is completely separated from the inner surface of the arc groove 271, the push block 22 continues to drive the bending rod 26 and the slider 27 to continue to move backward. At this time, the rack 25, the rotating plate 252, the spring 253 and the limiting roller 254 remain stationary. At this time, the slider 27 slides backward along the inner surface of the rectangular groove 251.

[0065] Meanwhile, the airbag 33 on the right side continues to be squeezed, causing the nozzle 36 on the rear side to continuously spray argon gas, so that the polished aluminum alloy tabs are still in an argon atmosphere.

[0066] Similarly, after the four adsorption rods 23 transfer the polished aluminum alloy tabs to the cover plate fixed at the upper end of the vacuum adsorption seat 11, the output end of the hydraulic cylinder 21 drives the push block 22 and the two adsorption rods 23 and bending rod 26 on the same side to move forward.

[0067] When the slider 27 moves forward to the front side wall of the inner surface of the rectangular groove 251, the slider 27 continues to move forward, which will drive the rack 25 to continue to move forward. As a result, the rotating plate 252 is driven to disengage from the stop block 241. When the rotating plate 252 is completely disengaged from the lower end of the stop block 241, the compressed spring 253 pushes the rotating plate 252 upward, which in turn causes the limiting roller 254 to descend, so that the lower arc surface of the limiting roller 254 continues to be in close contact with the inner surface of the arc groove 271, in preparation for the next transfer of aluminum alloy tabs.

[0068] Simultaneously, as the push block 22 on the right moves forward, it drives the push rod 31 and push plate 32 on the right to move forward, thereby allowing external argon gas to enter the air bladder 33 on the right. Similarly, when the rack 25 on the left moves backward, it cooperates with the push rod 31 and push plate 32 on the left to squeeze the air bladder 33 on the left, causing the gas inside the air bladder 33 on the left to be squeezed into the external gas collection tank.

[0069] Therefore, in this scheme, during the transfer of aluminum alloy tabs by the four adsorption rods 23, the middle part of the upper and lower ends of the aluminum alloy tabs is uniformly polished by the rack 25 in conjunction with the circular brush 43, effectively removing oxide layers and impurities such as microparticles, and avoiding poor welding due to surface impurities. At the same time, during the transfer of aluminum alloy tabs, the two airbags 33 and the two nozzles 36 can work together to achieve directional flow of argon gas, enveloping the tabs in an argon atmosphere. This not only prevents the clean surface after polishing from oxidizing rapidly, but also carries away the polishing dust with the airflow, avoiding dust contamination of the welding area.

[0070] Example 3: Based on Examples 1 and 2, this example aims to achieve the effect of elastically pressing the aluminum alloy electrode tabs during the welding process while also forming an argon rectangular cavity, so that the weldment is always in an argon atmosphere before and after welding.

[0071] See Figure 10The welding assembly 5 includes a second hydraulic cylinder 51 fixedly connected to the upper end of the operating table 1. A first horizontal plate 52 is fixedly connected to the output end of the second hydraulic cylinder 51. A laser welding head 57 is fixedly connected to the middle of the lower end of the first horizontal plate 52. Four telescopic rods 53 are symmetrically fixedly connected to the lower end of the first horizontal plate 52. Springs 56 are sleeved on the outer surface of each of the four telescopic rods 53. A circular plate 54 is fixedly connected to the lower end of the telescopic rods 53 and springs 56 on the same side. A silicone pad 55 is fixedly connected to the lower end of the circular plate 54.

[0072] When the polished and cleaned aluminum alloy tabs are placed on the upper part of the cover plate, the second hydraulic cylinder 51 is activated. The output end of the second hydraulic cylinder 51 pushes the first horizontal plate 52 downward. As the first horizontal plate 52 descends, it will drive the four telescopic rods 53, the circular plate 54, and the silicone pad 55 to descend simultaneously.

[0073] When the structure including the horizontal plate 52 descends to the point where the lower ends of the four silicone pads 55 contact the upper ends of the aluminum alloy tabs, the horizontal plate 52 continues to descend. At this time, the four telescopic rods 53 and the second spring 56 are compressed, and the horizontal plate 52 continues to drive the laser welding head 57 to descend to a suitable welding height, ready for welding.

[0074] At the same time, the four telescopic rods 53 and spring 56 are compressed and, in conjunction with the silicone pad 55 on the same side, press the aluminum alloy electrode tabs together to prevent displacement of the aluminum alloy electrode tabs and cover plate during the welding process.

[0075] See Figure 11 The moving component 7 includes a vertical plate 71 that is slidably connected to the upper end of the operating table 1. The front and rear ends of the vertical plate 71 are provided with limit grooves 711. Z-shaped rollers 72 are slidably connected to the inner surfaces of the two limit grooves 711. The two Z-shaped rollers 72 are fixedly connected to the horizontal plate 52. A U-shaped plate 73 is fixedly connected to the upper left side of the vertical plate 71.

[0076] During the process of the horizontal plate 52 being driven down by the output end of the hydraulic cylinder 51, the horizontal plate 52 will drive the two Z-shaped rollers 72 on the same side to descend simultaneously. Then, the horizontal part of the two Z-shaped rollers 72 slides along the inner surface of the limiting groove 711. During the process of the Z-shaped rollers 72 sliding down along the inner surface of the limiting groove 711, the vertical plate 71 slides to the left along the upper end of the operating table 1. At the same time, the vertical plate 71 drives the U-shaped plate 73 to move to the left. When the silicone pad 55 descends to contact the upper end of the aluminum alloy tab, the two Z-shaped rollers 72 move to the lower part of the inclined part of the inner surface of the matching limiting groove 711.

[0077] At the same time, the two U-shaped plates 73 on the left and right are closely attached to form a rectangle, and together with the cover plate below, the entire area to be welded forms a rectangular cavity.

[0078] See Figure 12The jet assembly 6 includes an airbag 63 fixedly connected to the upper end of the operating table 1. A horizontal plate 61 is fixedly connected to the upper end of the airbag 63. A slot 611 is provided at the upper end of the horizontal plate 61. When the Z-shaped roller 72 located on the rear side descends a certain distance, the outer surface of the Z-shaped roller 72 is in close contact with the inner surface of the slot 611. A spring 62 is fixedly connected to one side of the lower end of the horizontal plate 61 and the upper end of the operating table 1. A hose 64 is fixedly connected to one side of the outer surface of the airbag 63. Several nozzles 65 are fixedly connected to the end of the hose 64 away from the airbag 63. Several nozzles 65 are fixedly connected to the middle of the left end of the U-shaped plate 73.

[0079] The aforementioned airbag 2 63 is connected to an external argon gas source, and a one-way inlet valve is provided on the inner surface of the connection between airbag 2 63 and the argon gas source. At the same time, a one-way outlet valve is provided on the inner surface of the connection between airbag 2 63 and hose 2 64, so that argon gas can only pass through the airbag 2 63 and hose 2 64 and cannot flow in the reverse direction.

[0080] Furthermore, as the Z-shaped roller 72 continues to descend vertically along the inner surface of the matching limiting groove 711, the outer surface of the Z-shaped roller 72 located on the rear side is in close contact with the inner surface of the slot 611. Then, as the Z-shaped roller 72 descends, it will press down on the horizontal plate 61, thereby squeezing the spring 62 and the airbag 63.

[0081] Then, the argon gas inside the second airbag 63 is ejected from several nozzles 65 through the second hose 64, which will spray downward from the left and right walls of the rectangular cavity. With the cooperation of the cover plate located below, the argon gas will surround the area to be welded and will not dissipate in a short time.

[0082] Simultaneously, the laser welding head 57 reaches a suitable welding height, thereby activating the laser welding head 57 to weld the cover plate and aluminum alloy tabs under argon protection.

[0083] At the same time, the output end of hydraulic cylinder 2 51 drives the horizontal plate 1 52, the four telescopic rods 53, the spring 2 56, and the Z-shaped roller 72 to move upward. Meanwhile, the Z-shaped roller 72 no longer squeezes the horizontal plate 2 61. At this time, the compressed airbag 2 63 pushes the horizontal plate 2 61 upward, which in turn allows the external argon gas source to enter the airbag 2 63.

[0084] Similarly, as the Z-shaped roller 72 moves upward, the vertical plate 71 slides to the right along the upper end of the operating table 1 through the cooperation of the limiting groove 711, at which time the two U-shaped plates 73 separate.

[0085] After welding is completed, the vacuum adsorption seat 11 is released from its adsorption and fixation on the cover plate. The welded cover plate and aluminum alloy tabs can then be removed for the next operation. At the same time, a new cover plate to be welded is fixed on the upper end of the vacuum adsorption seat 11 in preparation for the next welding.

[0086] Therefore, this solution uses four silicone pads 55 to evenly press the aluminum alloy tabs and cover plate together with elastic buffering force. This not only avoids deformation of the aluminum alloy tabs caused by rigid extrusion, but also eliminates displacement caused by vibration during welding. In addition, two Z-shaped rollers 72, together with vertical plate 71 and U-shaped plate 73, form a rectangular cavity around the welding area before welding. At the same time, with the help of airbag 63, argon gas is injected into the rectangular cavity, so that the aluminum alloy tabs are always under argon protection during the welding process. This ensures that the aluminum alloy tabs do not come into contact with air during the welding process, thereby inhibiting the formation of pores. At the same time, uniform heat conduction reduces stress concentration during cooling, and the relatively sealed argon atmosphere can also reduce the heat-affected zone and prevent the cover plate from deforming due to overheating.

[0087] It should be noted that the specific installation method, circuit connection method and control method of hydraulic cylinder 21 and hydraulic cylinder 51 used in this invention are all conventional designs, and will not be described in detail in this invention.

[0088] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A laser welding apparatus for lithium battery production, comprising an operating table (1), characterized in that: The upper front side of the operating table (1) is symmetrically provided with a transfer component (2), and two cleaning components (4) are symmetrically provided on the upper front side of the operating table (1). The two transfer components (2) are provided with a protective component (3) on the side away from each other. The upper end of the operating table (1) is fixedly connected with a welding component (5). The lower part of the welding component (5) is symmetrically provided with a moving component (7). The rear side of the two moving components (7) is provided with an air jet component (6). The upper front side of the operating table (1) is symmetrically and fixedly connected with rectangular guide rails (12). The transfer assembly (2) includes a push block (22) slidably connected to the left end of a rectangular guide rail (12). A hydraulic cylinder (21) is fixedly connected to the upper end of the rectangular guide rail (12). The output end of the hydraulic cylinder (21) is fixedly connected to the front end of the push block (22). An adsorption rod (23) is symmetrically fixedly connected to the left end of the push block (22). A bending rod (26) is fixedly connected to the front end of the push block (22). A slider (27) is fixedly connected to the front side of the left end of the bending rod (26). An arc groove (271) is provided on the upper end of the slider (27). The upper end of the operating table (1) is fixedly connected to a fixed plate (24), and a stop block (241) is fixedly connected to the middle of the right end of the fixed plate (24). The lower end of the fixed plate (24) is slidably connected to a rack (25). A rectangular groove (251) is opened at the right end of the rack (25). The outer surface of the slider (27) is slidably connected to the inner surface of the rectangular groove (251). A rotating plate (252) is rotatably connected to the front side of the right end of the rack (25). A spring (253) is fixedly connected to the front side of the lower end of the rotating plate (252). A limiting roller (254) is rotatably connected to the rear side of the lower end of the rotating plate (252). The lower arc surface of the limiting roller (254) is in close contact with the inner surface of the arc groove (271). The cleaning assembly (4) includes three gears (42) that mesh with the outer surface of the rack (25). A rotating roller (41) is fixedly connected to the middle of each of the three gears (42), and a round brush (43) is fixedly connected to the lower end of each of the three rotating rollers (41). The protective component (3) includes a vertical plate (34) fixedly connected to the upper end of the operating table (1), an airbag (33) fixedly connected to the front end of the vertical plate (34), a push plate (32) fixedly connected to the front end of the airbag (33), a push rod (31) fixedly connected to the left end of the push plate (32), a hose (35) fixedly connected to the rear side of the outer surface of the vertical plate (34), and a nozzle (36) fixedly connected to the end of the hose (35) away from the vertical plate (34). The welding assembly (5) includes a hydraulic cylinder two (51) fixedly connected to the upper end of the operating table (1). A horizontal plate one (52) is fixedly connected to the output end of the hydraulic cylinder two (51). A laser welding head (57) is fixedly connected to the middle of the lower end of the horizontal plate one (52). Four telescopic rods (53) are symmetrically fixedly connected to the lower end of the horizontal plate one (52). Spring two (56) is sleeved on the outer surface of each of the four telescopic rods (53). A circular plate (54) is fixedly connected to the lower end of the telescopic rods (53) and spring two (56) on the same side. A silicone pad (55) is fixedly connected to the lower end of the circular plate (54). The jet assembly (6) includes an airbag two (63) fixedly connected to the upper end of the operating table (1). A horizontal plate two (61) is fixedly connected to the upper end of the airbag two (63). A slot (611) is opened at the upper end of the horizontal plate two (61). A spring three (62) is fixedly connected to one side of the lower end of the horizontal plate two (61) and the upper end of the operating table (1). A hose two (64) is fixedly connected to one side of the outer surface of the airbag two (63). A plurality of nozzles (65) are fixedly connected to one end of the hose two (64) away from the airbag two (63).

2. The laser welding apparatus for lithium battery production according to claim 1, characterized in that: A vacuum adsorption seat (11) is fixedly connected to the rear side of the upper end of the operating table (1), and a pad (13) is fixedly connected to the middle of the front side of the upper end of the operating table (1).

3. The laser welding apparatus for lithium battery production according to claim 1, characterized in that: The moving component (7) includes a second vertical plate (71) that is slidably connected to the upper end of the operating table (1). The second vertical plate (71) has a limit groove (711) at both the front and rear ends. Z-shaped rollers (72) are slidably connected to the inner surfaces of the two limit grooves (711). The two Z-shaped rollers (72) are fixedly connected to the first horizontal plate (52). A U-shaped plate (73) is fixedly connected to the upper left side of the second vertical plate (71).

4. The laser welding apparatus for lithium battery production according to claim 3, characterized in that: When the Z-shaped roller (72) located on the rear side descends a certain distance, the outer surface of the Z-shaped roller (72) is in close contact with the inner surface of the slot (611), and several of the nozzles (65) are fixedly connected to the middle of the left end of the U-shaped plate (73).

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