Laser welding device for lithium battery production

Abstract

The invention discloses a laser welding device for lithium battery production, and particularly relates to the technical field of welding devices.The laser welding device comprises an operation table, transferring assemblies are symmetrically arranged on the front side of the upper end of the operation table, two cleaning assemblies are symmetrically arranged on the front side of the upper end of the operation table, and protection assemblies are arranged on the sides, away from each other, of the two transferring assemblies; a welding assembly is fixedly connected to the upper end of the operation table, moving assemblies are symmetrically arranged on the lower portion of the welding assembly, and air injection assemblies are arranged on the rear sides of the two moving assemblies. The middle portions of the upper end and the lower end of the aluminum alloy tab piece are evenly polished through cooperation of the rack and the round brush, impurities such as an oxide layer and small particles are effectively removed, meanwhile, directional flowing of argon can be achieved through cooperation of the two first air bags and other structures, the tab piece is covered with the argon atmosphere, and the welding quality of the tab piece is improved. Not only can the polished clean surface be prevented from being quickly oxidized, but also polishing dust can be taken away along with airflow, and the dust is prevented from polluting a welding area.

Description

Technical Field

[0001] The present invention relates to the technical field of welding devices, and in particular to a laser welding device for lithium battery production. Background Art

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

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

[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 box cover with a mounting hole and a welding block. The mounting hole is used to install a connecting piece. The welding frame includes a pressing component, a plastic component, and a laser welding head. The pressing component is used to install the connecting piece in the mounting hole and connect it to the lithium battery. The plastic component is used to fix the connecting piece to the mounting hole. The laser welding head is used to weld the welding block to the connecting piece. This patent can effectively weld lithium batteries.

[0005] However, during the operation of the above-mentioned device, it is impossible to achieve the effect of grinding and cleaning the aluminum alloy pole tabs before welding while using nitrogen to flow in a directional manner to protect the grinding area and the polished aluminum alloy pole tabs. It is also impossible to elastically compress the aluminum alloy pole tabs and form an argon rectangular cavity during welding, so that the weldment is always in an argon atmosphere before and after welding. Summary of the Invention

[0006] The main purpose of the present invention is to provide a laser welding device for lithium battery production, which can effectively solve the problem of being unable to polish and clean the aluminum alloy pole tabs before welding while using nitrogen directional flow to protect the polishing area and the polished aluminum alloy pole tabs.

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

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

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

[0010] Preferably, the transfer assembly includes a push block slidingly connected to the left end of the rectangular guide rail, a hydraulic cylinder 1 is fixedly connected to the upper end of the rectangular guide rail, the output end of the hydraulic cylinder 1 is fixedly connected to the front end of the push block, the left end of the push block is symmetrically fixedly connected to an adsorption rod, the front end of the push block is fixedly connected to a bending rod, the front side of the left end of the bending rod is fixedly connected to a slider, and an arc groove is provided at the upper end of the slider.

[0011] Preferably, the upper end of the operating table is fixedly connected to a fixed plate, the middle of the right end of the fixed plate is fixedly connected to a stop block, the lower end of the fixed plate is slidably connected to a rack, the right end of the rack is provided with a rectangular groove, the outer surface of the slider is slidably connected to the inner surface of the rectangular groove, the front side of the right end of the rack is rotatably connected to a rotating plate, the front side of the lower end of the rotating plate is fixedly connected to a spring 1, the rear side of the lower end of the rotating plate is rotatably connected to a limiting roller, and the lower arc surface of the limiting roller is in close contact with the inner surface of the arc groove.

[0012] Preferably, the cleaning assembly includes three gears meshing with the outer surface of the rack, the middle parts of the three gears are fixedly connected to rollers, and the lower ends of the three rollers are fixedly connected to round brushes.

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

[0014] Preferably, the welding assembly includes a hydraulic cylinder 2 fixedly connected to the upper end of the operating table, the output end of the hydraulic cylinder 2 is fixedly connected to a horizontal plate 1, the middle of the lower end of the horizontal plate is fixedly connected to a laser welding head, the lower end of the horizontal plate is symmetrically fixedly connected to four telescopic rods, the outer surfaces of the four telescopic rods are each sleeved with a spring 2, the lower ends of the telescopic rod and the spring 2 on the same side are commonly fixedly connected to a circular plate, and the lower end of the circular plate is fixedly connected to a silicone pad.

[0015] Preferably, the movable component includes a vertical plate 2 that is slidably connected to the upper end of the operating table, and limiting grooves are provided at the front and rear ends of the vertical plate 2. The inner surfaces of the two limiting grooves are slidably connected with Z-shaped rollers, and the two Z-shaped rollers are fixedly connected to the horizontal plate 1. The upper left end of the vertical plate 2 is fixedly connected to a U-shaped plate.

[0016] Preferably, the jet assembly includes an airbag 2 fixedly connected to the upper end of the operating table, the upper end of the airbag 2 is fixedly connected to a horizontal plate 2, and the upper end of the horizontal plate 2 is provided with a card slot. When the Z-shaped roller located at the rear side drops a certain distance, the outer surface of the Z-shaped roller is in close contact with the inner surface of the card slot, and a spring 3 is fixedly connected to one side of the lower end of the horizontal plate 2 and the upper end of the operating table. A hose 2 is fixedly connected to one side of the outer surface of the airbag 2, and a plurality of nozzles are fixedly connected to the end of the hose 2 away from the airbag 2, and the plurality of nozzles are fixedly connected to the middle part 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. The present invention cooperates with a transfer component and a cleaning component. During the process of transferring the aluminum alloy tab sheet in preparation for welding, the middle parts of the upper and lower ends of the aluminum alloy tab are simultaneously polished to ensure the purity of the welding contact surface and avoid problems such as welding false connection and resistance increase caused by impurities. During the polishing process, two protective components can cooperate to form a directional argon gas flow and evenly cover the polishing area. At the same time, the directional flow of the airflow drives the polishing dust to be discharged forward to avoid dust accumulation or drifting to the welding area. Before welding, a sealed argon atmosphere is formed in the welding area by the welding component in combination with two moving components and two jet components. The automatic sinking property of argon is used to completely surround the tab and cover plate welding area. Compared with an open environment, it can significantly reduce the intrusion of external air, provide a stable inert gas atmosphere for the welding process, ensure that the oxygen content is extremely low during welding, and prevent defects such as pores and cracks from occurring in the welding area.

[0019] 2. The present invention uses a rack in conjunction with a round brush to evenly polish the middle of the upper and lower ends of the aluminum alloy pole tab during the process of transferring the aluminum alloy pole tab by four adsorption rods, thereby effectively removing impurities such as the oxide layer and tiny particles, and avoiding poor welding due to surface impurities. At the same time, during the process of transferring the aluminum alloy pole tab, two air bags and two nozzles can cooperate to achieve a directional flow of argon gas, covering the pole tab in an argon atmosphere, which can prevent the clean surface after polishing from being quickly oxidized, and can also carry away the polishing dust with the airflow, avoiding dust contamination of the welding area.

[0020] 3. The present invention cooperates with four silicone pads to uniformly compress the aluminum alloy pole tab and the cover plate through elastic buffering force, which can not only avoid the deformation of the aluminum alloy pole tab caused by rigid extrusion, but also eliminate the displacement caused by vibration during welding. It also cooperates with the vertical plate 2 and the U-shaped plate through two Z-shaped rollers to enclose the welding area into a rectangular cavity before welding. At the same time, it cooperates with the airbag 2 to spray argon into the inside of the rectangular cavity, so that the welding process is always under argon protection, ensuring that the aluminum alloy pole tab does not contact the air during welding, thereby inhibiting the formation of pores. At the same time, uniform heat conduction reduces stress concentration during cooling. At the same time, the relatively sealed argon atmosphere can also reduce the heat-affected zone, thereby avoiding deformation of the cover plate due to overheating. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 Schematic diagram of the overall internal structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the local structure of the present invention;

[0024] Figure 4 It is a schematic structural diagram of the transfer assembly of the present invention;

[0025] Figure 5 For the present invention Figure 4 A in the middle is an enlarged structural diagram;

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

[0027] Figure 7 It is a schematic diagram of the partial structure of the transfer assembly of the present invention;

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

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

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

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

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

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

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[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, and a protection component 3 is provided on the 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, and a moving component 7 is symmetrically arranged on the lower part of the welding component 5. The rear sides of the two moving components 7 are each provided with an air injection component 6.

[0036] When welding the square cover plate and the positive aluminum alloy tab of the lithium battery, the cover plate is adsorbed and fixed by the operating table 1, and the aluminum alloy tab to be welded is adsorbed and fixed by the two transfer components 2. When the two transfer components 2 cooperate to move the aluminum alloy tab to the inner surface above the cover plate, the transfer component 2 cooperates with the cleaning component 4 on the same side to realize simultaneous grinding of the middle part of the upper and lower ends of the aluminum alloy to remove impurity particles on the surface of the tab sheet. At the same time, during the transfer and grinding process, the protective component 3 located at the rear side continuously blows argon gas and the protective component 3 located at the front side continuously inhales air to form argon gas that flows through the aluminum alloy tab in a directional manner and then flows through the grinding area, ensuring that the aluminum alloy tab is always within the argon protection range when the tab sheet surface is polished and cleaned. At the same time, the airflow drives the grinding dust to flow forward in a directional manner and will not drift to the welding area to affect the subsequent welding effect.

[0037] Similarly, in the process of preparing for welding, when the welding assembly 5 descends, it cooperates with the two moving assemblies 7 to form a rectangular cavity around the aluminum alloy pole ear and the cover plate to be welded. Then, it cooperates with the two jet assemblies 6 to spray argon into the rectangular sealed cavity before welding, ensuring that the aluminum alloy pole ear and the cover plate are always under the protection of inert gas during welding, thereby further improving the welding quality.

[0038] During the operation of this embodiment, the transfer component 2 and the cleaning component 4 cooperate to simultaneously grind the middle of the upper and lower ends of the aluminum alloy pole ear in the process of transferring the aluminum alloy pole ear sheet in preparation for welding to ensure the purity of the welding contact surface and avoid problems such as welding false connection and increased resistance caused by impurities. During the grinding process, the two protection components 3 can cooperate to form a directional argon gas flow and evenly cover the grinding area. At the same time, the directional flow of the airflow drives the grinding dust to be discharged forward to avoid dust accumulation or drifting to the welding area. Before welding, the welding component 5 cooperates with the two moving components 7 and the two jet components 6 to form a sealed argon atmosphere for the welding area. The automatic sinking property of argon is used to completely surround the pole ear and the cover plate welding area. Compared with the open environment, it can significantly reduce the intrusion of external air, provide a stable inert gas atmosphere for the welding process, ensure that the oxygen content is extremely low during welding, and prevent defects such as pores and cracks from occurring in the welding area.

[0039] Example 2: Based on Example 1, this example is to achieve the effect of polishing and cleaning the aluminum alloy tab before welding while using nitrogen directional flow to protect the polishing area and the polished aluminum alloy tab.

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

[0041] The above-mentioned vacuum adsorption seat 11 is a conventional design in the prior art. Through the coordinated operation 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 elaborated in detail in this solution.

[0042] A number of aluminum alloy pole tabs to be welded are placed on the rear side of the upper end of the above-mentioned pad 13. At the same time, in conjunction with the conveying assembly in the prior art, when an aluminum alloy pole tab is transferred for welding, the new aluminum alloy pole tab will be pushed backward for a distance when the new aluminum alloy pole tab is conveyed to the upper end of the pad 13.

[0043] When preparing to weld the cover plate and the aluminum alloy tab, the vacuum adsorption seat 11 is used to adsorb and fix the cover plate.

[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 the 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. The left end of the push block 22 is symmetrically fixedly connected to an adsorption rod 23. The front end of the push block 22 is fixedly connected to a bending rod 26. The front side of the left end of the bending rod 26 is fixedly connected to a slider 27. The upper end of the slider 27 is provided with an arc groove 271.

[0045] The above-mentioned adsorption rod 23 is a conventional technical means in the prior art. Through the coordinated operation of the adsorption rod 23, the aluminum alloy pole tab sheet can be adsorbed and fixed. At the same time, during the movement of the four adsorption rods 23 and the aluminum alloy pole tab sheet, the aluminum alloy pole tab sheet will not experience positional displacement, etc. The specific structural composition and working principle of the adsorption rod 23 will not be elaborated in this scheme.

[0046] When the aluminum alloy tab is ready to be transferred 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 cooperate with each other to adsorb and fix the aluminum alloy tab.

[0047] After the four adsorption rods 23 cooperate to fix the aluminum alloy pole tab, the hydraulic cylinder 21 is activated, and then the output end of the hydraulic cylinder 21 pushes the push block 22 backward, so that the push block 22 drives the two adsorption rods 23 on the same side and the aluminum alloy pole tab and the bending rod 26 to slide backward along the left end of the rectangular guide rail 12 at the same time, and drives the slider 27 to move at the same time during the backward sliding process of the bending rod 26.

[0048] See Figure 5 and Figure 7 The upper end of the operating table 1 is fixedly connected to a fixed plate 24, and a stopper 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. The front side of the right end of the rack 25 is rotatably connected to a rotating plate 252. The front side of the lower end of the rotating plate 252 is fixedly connected to a spring 253. The rear side of the lower end of the rotating plate 252 is rotatably connected to a limiting roller 254. The lower arc surface of the limiting roller 254 is in close contact with the inner surface of the arc groove 271.

[0049] By compressing the spring 1 253 in advance, when the spring 1 253 is fixedly connected to the rotating plate 252, the spring 1 253 pushes the front end of the rotating plate 252 upward, thereby making the rotating plate 252 as a whole in a tilted state.

[0050] When the bending rod 26 drives 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, when the slider 27 moves, the limiting roller 254, the rotating plate 252 and the rack 25 are driven to move backward as a whole. At the same time, the rack 25 moves backward along the fixed plate 24.

[0051] See Figure 9 The cleaning assembly 4 includes three gears 42 meshing with the outer surface of the rack 25. The middle of the three gears 42 is fixedly connected to a roller 41, and the lower ends of the three rollers 41 are fixedly connected to a round brush 43.

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

[0053] Furthermore, in the process of fixing the aluminum alloy pole tab with four adsorption rods 23 and moving backward through the output end of the hydraulic cylinder 21 in cooperation with the slider 27 and the rack 25 and other structures, the rack 25 drives the three gears 42 on the same side to rotate, and then the three gears 42 will drive the coaxial roller 41 and the round brush 43 to rotate continuously. In the process of the aluminum alloy pole tab moving backward, the upper and lower three round brushes 43 rotate continuously to achieve the grinding of the upper and lower ends of the aluminum alloy pole tab, thereby removing the oxide layer and impurities such as tiny particles on the surface of the aluminum alloy pole tab.

[0054] See Figure 8 The protection 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 above-mentioned air bag 1 33 located on the right side is connected to the external argon gas source, and a one-way air inlet valve is provided on the inner surface of the connection between the air bag 1 33 and the external argon gas source. At the same time, a one-way air outlet valve is provided on the inner surface of the connection between the air bag 1 33 and the hose 1 35 located on the rear side, so that the argon gas can only enter the air bag 1 33 through the argon gas source and then flow to the inner surface of the hose 1 35 located on the rear side, and cannot flow in the opposite direction.

[0056] The above-mentioned air bag 1 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 air bag 1 33 and the external gas collection tank. A one-way air inlet valve is provided between the hose 1 35 located on the front side and the air bag 1 33 located on the left side, so that the external gas can only enter the air bag 1 33 through the hose 1 35 and then flow to the external gas collection tank, and cannot flow in the opposite direction.

[0057] The outer surface of the nozzle 36 is provided with a plurality of air ports.

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

[0059] Similarly, when the four adsorption rods 23 fix the aluminum alloy tab and move backward through the output end of the hydraulic cylinder 1 21 in conjunction with the slider 27 and the rack 25 and other structures:

[0060] As the push block 22 on the right side moves backward, it drives the push rod 31 and push plate 32 on the right side to move backward simultaneously, thereby squeezing the airbag 1 33 on the right side. At this time, the argon gas inside the airbag 1 33 on the right side flows through the inner surface of the hose 1 35 on the rear side to the nozzle 36 and is ejected forward.

[0061] When the output end of the hydraulic cylinder 21 on the left side drives the push block 22 and the rack 25 on the same side to move backward, it drives the push rod 31 and the push plate 32 on the left side to move backward at the same time, thereby stretching the air bag 33 on the left side, and then the gas on the outer surface of the nozzle 36 will enter the interior of the nozzle 36 and pass through the hose 35 on the front side and the air bag 33 on the left side into the outside gas collection tank.

[0062] Furthermore, through the cooperation of the two air bags 33, the hose 35 and the nozzle 36, during the process of transferring the aluminum alloy pole tab and grinding its upper and lower surfaces, the nozzle 36 located on the rear side continuously sprays argon, and the nozzle 36 located on the front side continuously inhales air, thereby promoting the directional flow of argon. The argon flow direction is from back to front, passing through the aluminum alloy pole tab being moved and polished, further realizing that the polishing process and the polished aluminum alloy pole tab are both covered in the argon atmosphere, avoiding the phenomenon that the newly exposed clean aluminum alloy pole tab surface is rapidly oxidized in the air, and at the same time, the directional flow of argon can also directional drive the dust generated during the polishing process, avoiding the polishing dust from floating on the cover plate or pole tab to be welded, thereby ensuring the subsequent welding quality.

[0063] See Figure 7 , when the push block 22, the bending rod 26, the slider 27 and other structures drive the four adsorption rods 23 and the aluminum alloy pole tab to move backward, when the aluminum alloy pole tab moves backward and disengages from the two rotating rollers 41 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 stopper 241. When the rack 25 continues to move backward, the stopper 241 cooperates to press the rotating plate 252 downward, which in turn compresses the spring 1 253, causing the rotating plate 252 to rotate around its own middle. During the rotation of the rotating plate 252, the limiting roller 254 is driven to move upward and gradually disengage 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 moving backward. At this time, the rack 25, the rotating plate 252, the spring 1 253 and the limiting roller 254 remain stationary, and the slider 27 slides backward along the inner surface of the rectangular groove 251.

[0065] At the same time, the air bag 1 33 on the right side continues to be squeezed, so that the nozzle 36 on the rear side continuously ejects argon gas, so that the polished aluminum alloy tab is still in the argon gas atmosphere.

[0066] Similarly, after the four adsorption rods 23 transfer the polished and cleaned aluminum alloy tab to the cover plate fixed on the upper end of the vacuum adsorption seat 11, the output end of the hydraulic cylinder 1 21 drives the push block 22 and the two adsorption rods 23 and the 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, and then the rotating plate 252 is driven to disengage from the limit of the block 241. When the rotating plate 252 is completely disengaged from the lower end of the block 241, the compressed spring 253 pushes the rotating plate 252 upward, thereby causing 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, preparing for the next transfer of the aluminum alloy pole piece.

[0068] At the same time, when the push block 22 on the right side moves forward, it drives the push rod 31 and the push plate 32 on the right side to move forward, thereby allowing the external argon gas to enter the air bag 1 33 on the right side. Similarly, when the rack 25 on the left side moves backward, it cooperates with the push rod 31 and the push plate 32 on the left side to squeeze the air bag 1 33 on the left side, so that the internal gas of the air bag 1 33 on the left side is squeezed into the external gas collection tank.

[0069] Therefore, in the process of transferring the aluminum alloy pole tab sheets by the four adsorption rods 23, the rack 25 cooperates with the round brush 43 to evenly grind the middle part of the upper and lower ends of the aluminum alloy pole tab sheets, effectively removing impurities such as the oxide layer and tiny particles, and avoiding poor welding due to surface impurities. At the same time, in the process of transferring the aluminum alloy pole tab sheets, the two air bags 33 and the two nozzles 36 can cooperate to achieve directional flow of argon gas, covering the pole tab sheets in an argon atmosphere, which can prevent the clean surface after grinding from oxidizing quickly and carry away the grinding dust with the airflow, avoiding dust contamination of the welding area.

[0070] Embodiment 3: Based on embodiments 1 and 2, this embodiment is designed to achieve the effect of elastically pressing the aluminum alloy tabs and forming an argon rectangular cavity during the welding process, so that the weldment is always in an argon atmosphere before and after welding.

[0071] See Figure 10The welding assembly 5 includes a hydraulic cylinder 2 51 fixedly connected to the upper end of the operating table 1, the output end of the hydraulic cylinder 2 51 is fixedly connected to a horizontal plate 1 52, the middle part of the lower end of the horizontal plate 1 52 is fixedly connected to a laser welding head 57, the lower end of the horizontal plate 1 52 is symmetrically fixedly connected to four telescopic rods 53, the outer surfaces of the four telescopic rods 53 are all sleeved with springs 2 56, the lower ends of the telescopic rods 53 and springs 2 56 on the same side are commonly fixedly connected to a circular plate 54, and the lower end of the circular plate 54 is fixedly connected to a silicone pad 55.

[0072] When the polished and cleaned aluminum alloy tab is placed on the upper end of the cover plate, the hydraulic cylinder 2 51 is activated, and the output end of the hydraulic cylinder 2 51 pushes the horizontal plate 1 52 downward. Then, during the process of the horizontal plate 1 52 descending, the four telescopic rods 53, the circular plate 54, and the silicone pad 55 and other structures are driven to descend simultaneously.

[0073] When the horizontal plate 1 52 and other structures descend 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 1 52 continues to descend. At this time, the four telescopic rods 53 and the spring 2 56 are compressed, and the horizontal plate 1 52 continues to drive the laser welding head 57 to descend to a suitable welding height to prepare for welding.

[0074] At the same time, the four telescopic rods 53 and the second spring 56 are compressed to cooperate with the silicone pad 55 on the same side to press the aluminum alloy pole tab, thereby preventing the aluminum alloy pole tab and the cover plate from being displaced during the welding process.

[0075] See Figure 11 The moving component 7 includes a vertical plate 2 71 that is slidably connected to the upper end of the operating table 1. The front and rear ends of the vertical plate 2 71 are provided with limiting grooves 711. The inner surfaces of the two limiting grooves 711 are slidably connected with Z-shaped rollers 72. The two Z-shaped rollers 72 are fixedly connected to the horizontal plate 1 52. The upper side of the left end of the vertical plate 2 71 is fixedly connected to a U-shaped plate 73.

[0076] When the horizontal plate 1 52 is driven to descend by the output end of the hydraulic cylinder 2 51 , the horizontal plate 1 52 will drive the two Z-shaped rollers 72 on the same side to descend at the same time, and then the horizontal parts of the two Z-shaped rollers 72 slide along the inner surface of the limiting groove 711 . When the Z-shaped rollers 72 slide downward along the inner surface of the limiting groove 711 , the vertical plate 2 71 slides to the left along the upper end of the operating table 1 . At the same time, the vertical plate 2 71 drives the U-shaped plate 73 to move to the left at the same time during the sliding process. 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 adaptive limiting groove 711 .

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

[0078] See Figure 12The jet assembly 6 includes an airbag 2 63 fixedly connected to the upper end of the operating table 1, and the upper end of the airbag 2 63 is fixedly connected to the horizontal plate 2 61. The upper end of the horizontal plate 2 61 is provided with a card slot 611. When the Z-shaped roller 72 located at the rear side drops a certain distance, the outer surface of the Z-shaped roller 72 is in close contact with the inner surface of the card slot 611. One side of the lower end of the horizontal plate 2 61 and the upper end of the operating table 1 are jointly fixedly connected with a spring 3 62. One side of the outer surface of the airbag 2 63 is fixedly connected with a hose 2 64. The end of the hose 2 64 away from the airbag 2 63 is fixedly connected with a plurality of nozzles 65. The plurality of nozzles 65 are jointly fixedly connected to the middle part of the left end of the U-shaped plate 73.

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

[0080] Furthermore, as the Z-shaped roller 72 continues to descend along the vertical portion of the inner surface of the adapted limiting groove 711, the outer surface of the Z-shaped roller 72 at the rear side is in close contact with the inner surface of the clamping groove 611. Subsequently, as the Z-shaped roller 72 descends, it presses the second transverse plate 61 downward, thereby squeezing the third spring 62 and the second airbag 63.

[0081] Then, the argon gas inside the second airbag 63 is ejected from the plurality of nozzles 65 through the second hose 64, that is, it is ejected downward from the left and right walls of the inner surface of the rectangular cavity. The argon gas is then surrounded by the cover plate located below, so that the argon gas surrounds the area to be welded and does not dissipate in a short time.

[0082] At the same time, the laser welding head 57 reaches a suitable welding height, and then the laser welding head 57 is excited to weld the cover plate and the aluminum alloy tab sheet under argon protection.

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

[0084] Similarly, when the Z-shaped roller 72 moves upward, the second vertical plate 71 slides to the right along the upper end of the operating table 1 through the cooperation of the limiting groove 711, and the two U-shaped plates 73 are separated.

[0085] After welding is completed, the vacuum adsorption seat 11 is released from the adsorption and fixation of the cover plate, and the welded cover plate and aluminum alloy tab sheet can be taken out 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 to prepare for the next welding.

[0086] Therefore, this solution uses four silicone pads 55 to cooperate and evenly compress the aluminum alloy pole ear sheet and the cover plate through elastic buffering force, which can not only avoid the deformation of the aluminum alloy pole ear caused by rigid extrusion, but also eliminate the displacement caused by vibration during welding. It also uses two Z-shaped rollers 72 to cooperate with the vertical plate 2 71 and the U-shaped plate 73. Before welding, the welding area is enclosed into a rectangular cavity, and at the same time, it cooperates with the airbag 2 63 to spray argon into the inside of the rectangular cavity, so that the welding process is always under argon protection, ensuring that the aluminum alloy pole ear does not contact the air during welding, thereby inhibiting the formation of pores. At the same time, uniform heat conduction reduces stress concentration during cooling. At the same time, the relatively sealed argon atmosphere can also reduce the heat-affected zone, thereby avoiding deformation of the cover plate due to overheating.

[0087] It should be noted that the specific installation method, circuit connection method and control method of the hydraulic cylinder 1 21 and the hydraulic cylinder 2 51 used in the present invention are all conventional designs and will not be elaborated in detail in the present invention.

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

Claims

1. A laser welding device for lithium battery production, comprising an operating table (1), characterized in that: A transfer assembly (2) is symmetrically arranged on the front side of the upper end of the operating table (1), two cleaning assemblies (4) are symmetrically arranged on the front side of the upper end of the operating table (1), and a protection assembly (3) is arranged on the side away from each other of the two transfer assemblies (2). A welding assembly (5) is fixedly connected to the upper end of the operating table (1), and a moving assembly (7) is symmetrically arranged on the lower part of the welding assembly (5), and an air injection assembly (6) is arranged on the rear side of the two moving assemblies (7).

2. A laser welding device for lithium battery production according to claim 1, characterized in that: The rear side of the upper end of the operating table (1) is fixedly connected to a vacuum adsorption seat (11), the front side of the upper end of the operating table (1) is symmetrically fixedly connected to a rectangular guide rail (12), and the middle part of the front side of the upper end of the operating table (1) is fixedly connected to a pad (13).

3. A laser welding device for lithium battery production according to claim 2, characterized in that: The transfer assembly (2) comprises a push block (22) slidably connected to the left end of the rectangular guide rail (12); the upper end of the rectangular guide rail (12) is fixedly connected to a hydraulic cylinder (21); the output end of the hydraulic cylinder (21) is fixedly connected to the front end of the push block (22); the left end of the push block (22) is symmetrically fixedly connected to an adsorption rod (23); the front end of the push block (22) is fixedly connected to a bending rod (26); the front side of the left end of the bending rod (26) is fixedly connected to a slider (27); the upper end of the slider (27) is provided with an arc groove (271).

4. A laser welding device for lithium battery production according to claim 3, characterized in that: The upper end of the operating table (1) is fixedly connected to a fixed plate (24), the middle part of the right end of the fixed plate (24) is fixedly connected to a stopper (241), the lower end of the fixed plate (24) is slidably connected to a rack (25), the right end of the rack (25) is provided with a rectangular groove (251), the outer surface of the slider (27) is slidably connected to the inner surface of the rectangular groove (251), the front side of the right end of the rack (25) is rotatably connected to a rotating plate (252), the front side of the lower end of the rotating plate (252) is fixedly connected to a spring (253), the rear side of the lower end of the rotating plate (252) is rotatably connected to a limiting roller (254), and the lower arc surface of the limiting roller (254) is in close contact with the inner surface of the arc groove (271).

5. The laser welding device for lithium battery production according to claim 4, characterized in that: The cleaning assembly (4) comprises three gears (42) meshing with the outer surface of the rack (25), the middle parts of the three gears (42) are fixedly connected to rollers (41), and the lower ends of the three rollers (41) are fixedly connected to round brushes (43).

6. The laser welding device for lithium battery production according to claim 1, characterized in that: The protection assembly (3) comprises a vertical plate (34) fixedly connected to the upper end of the operating table (1), an air bag (33) fixedly connected to the front end of the vertical plate (34), a push plate (32) fixedly connected to the front end of the air bag (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).

7. The laser welding device for lithium battery production according to claim 1, characterized in that: The welding assembly (5) includes a hydraulic cylinder 2 (51) fixedly connected to the upper end of the operating table (1), the output end of the hydraulic cylinder 2 (51) is fixedly connected to a horizontal plate 1 (52), the middle part of the lower end of the horizontal plate 1 (52) is fixedly connected to a laser welding head (57), the lower end of the horizontal plate 1 (52) is symmetrically fixedly connected to four telescopic rods (53), the outer surfaces of the four telescopic rods (53) are all sleeved with spring 2 (56), the lower ends of the telescopic rods (53) and the spring 2 (56) on the same side are fixedly connected to a circular plate (54), and the lower end of the circular plate (54) is fixedly connected to a silicone pad (55).

8. The laser welding device for lithium battery production according to claim 7, characterized in that: The moving assembly (7) comprises a second vertical plate (71) slidably connected to the upper end of the operating table (1), a limiting groove (711) is provided at the front and rear ends of the second vertical plate (71), the inner surfaces of the two limiting grooves (711) are slidably connected to Z-shaped rollers (72), the two Z-shaped rollers (72) are fixedly connected to the first horizontal plate (52), and a U-shaped plate (73) is fixedly connected to the upper left end of the second vertical plate (71).

9. The laser welding device for lithium battery production according to claim 8, characterized in that: The jet assembly (6) includes an airbag 2 (63) fixedly connected to the upper end of the operating table (1), the upper end of the airbag 2 (63) is fixedly connected to a transverse plate 2 (61), the upper end of the transverse plate 2 (61) is provided with a card slot (611), when the Z-shaped roller (72) located at the rear side is lowered a certain distance, the outer surface of the Z-shaped roller (72) is in close contact with the inner surface of the card slot (611), one side of the lower end of the transverse plate 2 (61) and the upper end of the operating table (1) are fixedly connected to a spring 3 (62), one side of the outer surface of the airbag 2 (63) is fixedly connected to a hose 2 (64), the end of the hose 2 (64) away from the airbag 2 (63) is fixedly connected to a plurality of nozzles (65), and the plurality of nozzles (65) are fixedly connected to the middle part of the left end of the U-shaped plate (73).

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