A laser compound welding method suitable for multi-layer aluminum foil tabs

Abstract

The present application relates to a kind of laser composite welding methods suitable for multilayer aluminum foil tab, comprising the following steps: step S1, multilayer aluminum foil is flattened stack, ultrasonic welding and cutting are carried out;Step S2, by alcohol wiping aluminum foil and battery top cover, remove surface dirt;Step S3, the battery top cover that is milled out step by machining is placed in battery top cover fixing piece;Step S4, the multilayer aluminum foil treated in step S1 is placed at the step of battery top cover, and the cross section of aluminum foil and step is compressed using the copper cup of laser composite welding device;Step S5, by moving piece, laser welding piece reaches the welding working position of the cross section of aluminum foil and step;Step S6, by laser welding piece, the welding working position of the cross section of aluminum foil and step is welded, while opening dust removal and protective gas, protective gas and dust removal are blown into welding working position by copper cup.The present application effectively improves the energy density of battery, improves the performance of product, and is not easy to cause welding crack.

Description

Technical Field

[0001] This invention relates to the field of electrode welding technology, and in particular to a laser composite welding method suitable for multilayer aluminum foil electrodes. Background Technology

[0002] With the recent surge in popularity of new energy vehicles, the capacity of power batteries has garnered increasing attention, and high-range power batteries will remain a key focus for the industry for some time. Given the limited space, increasing battery energy density and reducing internal resistance are crucial methods for manufacturers to improve battery range. Previously, the industry commonly used ultrasonic welding to attach multiple layers of aluminum foil to an adapter plate, which was then welded to the top cover structure. For the battery, using an adapter plate added an extra structural element, increasing manufacturer costs and resulting in higher internal resistance and power loss. Furthermore, when the multi-layer tabs were made of aluminum or copper, the high reflectivity of these materials led to low laser absorption at room temperature. The more layers there were, the more interlayer gaps appeared, increasing the likelihood of interlayer cracks during welding and causing weld failure, making it difficult to effectively guarantee laser welding quality. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a laser composite welding method suitable for multilayer aluminum foil tabs.

[0004] This invention is achieved using the following scheme: a laser composite welding method suitable for multilayer aluminum foil tabs.

[0005] Includes the following steps:

[0006] Step S1: Stack multiple layers of aluminum foil flat, perform ultrasonic welding, and cut along the edge of the ultrasonic welding area.

[0007] Step S2: Wipe the aluminum foil and battery top cover with alcohol to remove surface oil and dirt;

[0008] Step S3: Place the battery top cover with the steps milled out by machining into the battery top cover fixing part of the laser composite welding device;

[0009] Step S4: Place the multi-layer aluminum foil processed in step S1 at the step of the battery top cover, and use the copper cup of the laser composite welding device to press the aluminum foil and the step cross section together.

[0010] Step S5: Using the moving part of the laser composite welding device, the laser welding part of the laser composite welding device is brought to the welding working position of the cross section between the aluminum foil and the step.

[0011] Step S6: Weld the aluminum foil and the step cross-section at the welding position using laser welding components. At the same time, turn on the dust removal and protective gas, and blow the protective gas and dust removal into the welding position through the copper cup.

[0012] Furthermore, the laser composite welding device includes a worktable, a gantry frame is provided at the rear end of the upper surface of the worktable, a movable component is provided at the front side of the crossbar of the gantry frame, and a laser welding component is provided at the front side of the longitudinal moving seat of the movable component; a linear module is provided on the worktable, and a battery top cover fixing component is provided on the moving platform of the linear module, and the battery top cover fixing component is located below the laser welding component.

[0013] Furthermore, the movable component includes a first linear slide, a second linear slide, a transverse movable seat, a longitudinal movable seat, a first guide rail, a second guide rail, a first slider, and a second slider. The first linear slide is arranged along the length of the crossbar on the front side of the gantry frame. Two first guide rails are arranged along the length of the crossbar on the front side of the gantry frame. The first linear slide is located between the two first guide rails. The transverse movable seat is fixed on the movable platform of the first linear slide. The rear surface of the transverse movable seat is provided with a first slider that matches the guide rail. The first slider is slidably connected to the guide rail. The second linear slide is longitudinally arranged on the front surface of the transverse movable seat. The second guide rail is longitudinally arranged on the front surface of the transverse movable seat. The second guide rail and the second linear slide are arranged side-by-side. The longitudinal movable seat is arranged on the front surface of the movable platform of the second linear slide. The rear surface of the longitudinal movable seat is provided with a second slider that matches the second guide rail. The second slider is slidably connected to the second guide rail. The laser-welded component is arranged on the front surface of the longitudinal movable seat.

[0014] Furthermore, limit blocks are provided at both ends of the front side of the crossbar of the gantry frame, the limit blocks are located between the two guide rails, and the first linear slide is located between the two limit blocks.

[0015] Furthermore, the laser welding component includes a ring-shaped laser, a galvanometer, a camera, a rangefinder, and a dust removal tube. The ring-shaped laser and the camera are arranged on the front side of the longitudinal moving base of the moving component. The camera and the ring-shaped laser are arranged to the left and right of each other. The output end of the ring-shaped laser is connected to the galvanometer via an optical fiber. The dust removal tube is arranged on the front side of the ring-shaped laser, and the rangefinder is arranged on the front side of the dust removal tube. The battery top cover fixing component is located below the galvanometer and the camera.

[0016] Furthermore, the battery top cover fixing component includes a supporting base plate, a first telescopic cylinder, a supporting block, a connecting block, a supporting plate, a positioning plate, a clamping arm, a copper cup, a fixing block, a supporting column, equal-height bolts, a spring, and a limiting plate. The supporting base plate is provided on the moving platform of the linear module. The first telescopic cylinders are provided at both ends of the upper surface of the supporting base plate. A connecting block is fixed to the upper end of the first telescopic cylinder. The supporting plate is provided between the two first telescopic cylinders. The two ends of the supporting plate are respectively connected to the two connecting blocks. The supporting blocks are provided around the upper surface of the supporting plate. The positioning plate is provided above the supporting plate. The lower surface of the positioning plate is connected to... The support block is connected, and the upper surface of the positioning plate is provided with positioning protrusions around the perimeter for positioning the battery top cover; both ends of the support plate are provided with fixing blocks, and the support block is located between the two fixing blocks. Both ends of the upper surface of the fixing block are provided with support columns, and the top of the support column is fixed with the equal-height bolt. The spring is sleeved on the stud of the equal-height bolt. The limiting plate is provided above the two springs on the same side. Both ends of the limiting plate are sleeved in the two equal-height bolts on the same side. The limiting plate is provided with a placement groove that matches the battery top cover; the end of the telescopic rod of the first telescopic cylinder is provided with the clamping arm, and the end of the clamping arm is fixed with the copper cup.

[0017] Furthermore, a battery protective cover is fixed to the positioning plate by fixing bolts.

[0018] Furthermore, the copper cup includes an inverted trapezoidal cavity, with an inlet at the top and an outlet at the bottom. A protective gas outlet is provided on one side of the inverted trapezoidal cavity, and a dust removal port is provided on the other side of the inverted trapezoidal cavity. The dust removal port is connected to the dust removal pipe.

[0019] Furthermore, the laser-welded part has a defocus distance of +2mm from the bottom to the welding surface, a welding speed of 80-100mm / s, a spiral oscillation method, and a welding length of 12mm; the protective gas flow rate is 10L / min, and the dust removal gas flow rate is 15m / s.

[0020] Furthermore, the protective gas is nitrogen.

[0021] The beneficial effects of this invention are as follows: By employing laser welding and adjusting welding process parameters during the welding process, this invention ensures good weld formation between the multi-layer aluminum foil and the battery top cover, effectively welding the multi-layer aluminum foil and the battery top cover electrode together without macroscopic defects or interlayer cracks. All performance aspects meet production application standards, effectively improving battery energy density and enhancing product performance. Ultrasonic welding between the aluminum foils reduces interlayer gaps. Because the aluminum foil is very thin, rapid cooling during welding can cause thermal cracks. By using an annular laser spot, the temperature around the weld does not drop sharply, stress concentration is less pronounced, and welding cracks are less likely to occur. Simultaneously, the annular laser spot significantly improves the aesthetics of the weld formation. Attached Figure Description

[0022] Figure 1 This is a flowchart of the method of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the laser composite welding device;

[0024] Figure 3 This is a front view of the laser composite welding device;

[0025] Figure 4 This is a side view of the laser composite welding device;

[0026] Figure 5 This is a top view of the laser composite welding device;

[0027] Figure 6 for Figure 5 Enlarged view of a portion of point A in the middle;

[0028] Figure 7 This is a structural schematic diagram of the battery top cover fixing component;

[0029] Figure 8 This is a front view of the battery top cover fastener;

[0030] Figure 9 This is a schematic diagram of the structure of the copper cup. Detailed Implementation

[0031] The invention will now be further described with reference to the accompanying drawings.

[0032] Please see Figure 1 As shown, the present invention provides an embodiment: a laser composite welding method suitable for multilayer aluminum foil tabs, comprising the following steps:

[0033] Step S1: Stack multiple layers of aluminum foil flat, perform ultrasonic welding, and cut along the edge of the ultrasonic welding area.

[0034] Not all aluminum foils are ultrasonically welded; ultrasonic treatment is only performed on the areas where composite welding is required. This modification firstly reduces the interlayer gaps and internal resistance of the ultrasonically welded aluminum foils. At the same time, the wrinkled surface of the ultrasonically welded aluminum foil reduces glare and absorbs more heat compared to smooth aluminum foil, thus improving the welding quality.

[0035] Step S2: Wipe the aluminum foil and battery top cover with alcohol to remove surface oil and dirt;

[0036] Step S3: Place the battery top cover with the steps milled out by machining into the battery top cover fixing part of the laser composite welding device;

[0037] Step S4: Place the multi-layer aluminum foil processed in step S1 at the step of the battery top cover, and use the copper cup of the laser composite welding device to press the aluminum foil and the step cross section together.

[0038] Step S5: Using the moving part of the laser composite welding device, the laser welding part of the laser composite welding device is brought to the welding working position of the cross section between the aluminum foil and the step.

[0039] Step S6: Weld the aluminum foil and the step cross-section at the welding position using laser welding components. At the same time, turn on the dust removal and protective gas, and blow the protective gas and dust removal into the welding position through the copper cup.

[0040] Please continue reading. Figures 2 to 9 As shown, in one embodiment of the present invention, the laser composite welding device includes a worktable 1, a gantry frame 2 is provided at the rear end of the upper surface of the worktable 1, a movable component 3 is provided on the front side of the crossbar of the gantry frame 2, and a laser welding component 4 is provided on the front side of the longitudinal movable seat of the movable component 3; a linear module 5 is provided on the worktable 1, and a battery top cover fixing component 6 is provided on the movable platform of the linear module 5, and the battery top cover fixing component 6 is located below the laser welding component 4. Workbench 1 is used to install gantry 2 and linear module 5, and is also the working area for welding the battery top cover and aluminum foil. Gantry 2 is used to install moving parts 3, and allows the laser welding parts 4 to be suspended, so that the laser welding parts 4 do not occupy the working area of ​​workbench 1. Moving parts 3 are used to move the laser welding parts 4 horizontally, laterally and vertically, so that the laser welding parts 4 can be flexibly moved to the position to be welded. The laser welding parts 4 are used to weld the battery top cover and aluminum foil. Linear module 5 is used to move the battery top cover fixing parts 6, so that the battery top cover fixing parts 6 move to below the laser welding parts 4 when the battery top cover needs to be welded, and leave the working area of ​​the laser welding parts 4 after welding to avoid accidents. The battery top cover fixing parts 6 are used to fix the battery top cover and aluminum foil to prevent relative displacement between the battery top cover and aluminum foil during welding, which would lead to welding failure.

[0041] Please continue reading. Figures 2 to 6 As shown, in one embodiment of the present invention, the movable component 3 includes a first linear slide 31, a second linear slide 32, a transverse movable seat 33, a longitudinal movable seat 34, a first guide rail 35, a second guide rail 36, a first slider, and a second slider 37. The first linear slide 31 is arranged along the length of the crossbar on the front side of the gantry frame 2. Two first guide rails 35 are arranged along the length of the crossbar on the front side of the gantry frame 2. The first linear slide 31 is located between the two first guide rails 35. The transverse movable seat 33 is fixed on the movable platform of the first linear slide 31. The rear surface of the transverse movable seat 33 is provided with a groove that connects with the guide rail. The first slider is matched and slidably connected to the guide rail. The second linear slide 32 is longitudinally arranged on the front surface of the transverse moving seat 33. The second guide rail 36 is longitudinally arranged on the front surface of the transverse moving seat 33. The second guide rail 36 and the second linear slide 32 are arranged side by side. The longitudinal moving seat 34 is arranged on the front surface of the moving stage of the second linear slide 32. The second slider 37, which matches the second guide rail 36, is arranged on the rear surface of the longitudinal moving seat 34. The second slider 37 is slidably connected to the second guide rail 36. The laser-welded part 4 is arranged on the front surface of the longitudinal moving seat 34. The first linear slide 31 is used to drive the transverse moving seat 33 to move laterally, thereby driving the laser-welded part 4 to move laterally. The second linear slide 32 is used to drive the longitudinal moving seat 34 to move longitudinally, thereby driving the laser-welded part 4 to move longitudinally. Through the cooperation of the first linear slide 31 and the second linear slide 32, the laser-welded part 4 can be welded close to the welding point. The transverse moving seat 33 is used to install the second linear slide 32, and the longitudinal moving seat 34 is used to install and fix the laser-welded part 4. The first guide rail 35 and the first slider are used to guide the movement of the transverse moving seat 33, and the second guide rail 36 and the second slider 37 are used to guide the movement of the longitudinal moving seat 34.

[0042] Please continue reading. Figure 2 and Figure 3 As shown, in one embodiment of the present invention, limit blocks 7 are provided at both ends of the front side of the crossbar of the gantry frame 2. The limit blocks 7 are located between the two guide rails, and the first linear slide 31 is located between the two limit blocks 7. The limit blocks 7 are used to prevent the lateral moving seat 33 from moving laterally beyond its travel distance and causing derailment.

[0043] Please continue reading. Figures 2 to 6As shown, in one embodiment of the present invention, the laser welding component 4 includes a ring-shaped laser, a galvanometer 41, a camera 42, a rangefinder 43, and a dust removal tube 44. The ring-shaped laser and the camera 42 are disposed on the front side of the longitudinal moving seat 34 of the moving component 3. The camera 42 and the ring-shaped laser are disposed to the left and right of each other. The output end of the ring-shaped laser is connected to the galvanometer 41 via an optical fiber. The dust removal tube 44 is disposed on the front side of the ring-shaped laser. The rangefinder 43 is disposed on the front side of the dust removal tube 44. The battery top cover fixing component 6 is located below the galvanometer 41 and the camera 42. The galvanometer 41 is used to emit a high-power laser to weld the aluminum foil and the battery top cover steps. The galvanometer 41 is equipped with a ring-shaped laser, which is connected to the galvanometer 41 via an optical fiber. The ring-shaped laser is a light source used to provide an energy beam for welding. The function of the galvanometer 41 is to focus the beam and direct it to the desired position. The camera 42 is used to take pictures of the welding area to obtain welding images. The rangefinder 43 is used to detect the height between the galvanometer 41 and the working surface during welding to prevent the galvanometer 41 from being too close or too far from the aluminum foil and battery top cover, which would affect the welding quality. The dust removal pipe 44 is used to connect an external dust collector to the copper cup 68 to provide dust removal air to the copper cup 68.

[0044] Please continue reading. Figures 2 to 5 , Figures 7 to 9As shown, in one embodiment of the present invention, the battery top cover fixing component 6 includes a supporting base plate 61, a first telescopic cylinder 62, a supporting block 63, a connecting block 64, a supporting plate 65, a positioning plate 66, a clamping arm 67, a copper cup 68, a fixing block 69, a supporting column 610, an equal-height bolt 611, a spring (not shown), and a limiting plate 612. The supporting base plate 61 is provided on the moving platform of the linear module 5. The first telescopic cylinder 62 is provided at both ends of the upper surface of the supporting base plate 61. The connecting block 64 is fixed at the upper end of the first telescopic cylinder 62. The supporting plate 65 is provided between the two first telescopic cylinders 62. The two ends of the supporting plate 65 are respectively connected to the two connecting blocks 64. The supporting blocks 63 are provided around the upper surface of the supporting plate 65. The positioning plate 66 is provided above the supporting plate 65. The lower surface of the 6 is connected to the support block 63. The upper surface of the positioning plate 66 is provided with positioning protrusions around the perimeter for positioning the battery top cover. The support plate 65 is provided with fixing blocks 69 at both ends. The support block 63 is located between the two fixing blocks 69. The upper surface of the fixing block 69 is provided with support columns 610 at both ends. The top of the support column 610 is fixed with the equal-height bolt 611. The equal-height bolt 611 is fitted with the spring (not shown) on the stud. The limiting plate 612 is provided above the two springs (not shown) on the same side. The two ends of the limiting plate 612 are fitted into the two equal-height bolts 611 on the same side. The limiting plate 612 is provided with a placement groove that matches the battery top cover. The telescopic rod end of the first telescopic cylinder 62 is provided with the clamping arm 67. The end of the clamping arm 67 is fixed with the copper cup 68.The support base plate 61 is used to install the first telescopic cylinder 62. The support base plate 61 is installed on the moving platform of the linear module 5, so that the linear module 5 can drive the support base plate 61 to move. The first telescopic cylinder 62 is used to drive the clamping arm 67 to move up and down, thereby driving the copper cup 68 to move up and down, pressing the aluminum foil onto the step of the battery top cover. The support block 63 is used to support the positioning plate 66. The connecting block 64 is used to fix the support plate 65 between the two first telescopic cylinders 62. The support plate 65 is used to install the support block 63. The positioning plate 66 uses the positioning protrusion on the positioning plate 66 to position and limit the middle position of the battery top cover, preventing the battery top cover from moving. The clamping arm 67 is used to connect the first telescopic cylinder 62 to the moving platform. The compression cylinder 62 and the copper cup 68 are used to press the aluminum foil and the battery top cover step together. The fixing block 69 is used to fix the support column 610 on the support plate 65. The support column 610 is used to fix the equalizing bolt 611. The equalizing bolt 611 is used to limit the limiting plate 612, so that the limiting plate 612 can move up and down within the stud stroke of the equalizing bolt 611. The spring (not shown) is used to support the limiting plate 612 when the copper cup 68 presses down on the aluminum foil and the battery top cover, so that the aluminum foil and the battery top cover are pressed together under the bidirectional compression of the copper cup 68 and the limiting plate 612. The limiting plate 612 is used to place the two ends of the battery top cover and limit the two ends of the battery top cover.

[0045] Please continue reading. Figures 2 to 4 , Figure 7 , Figure 8 As shown, in one embodiment of the present invention, a battery protective cover 8 is fixed to the positioning plate 66 by fixing bolts. The battery protective cover 8 is used to protect the battery top cover and prevent damage to the battery top cover during welding.

[0046] Please continue reading. Figures 2 to 5 , Figure 9 As shown, in one embodiment of the present invention, the copper cup 68 includes an inverted trapezoidal cavity. An inlet 9 is provided at the top of the inverted trapezoidal cavity, and an outlet 10 is provided at the bottom. A protective gas outlet 11 is provided on one side of the inverted trapezoidal cavity, and a dust removal port 12 is provided on the other side. The dust removal port is connected to the dust removal pipe. The protective gas outlet 11 is used to connect to an external protective gas device to blow out inert gas to prevent weld oxidation. The dust removal port 12 is used to promptly remove the fumes generated during welding and the inert gas blown over the weld. The height of the protective gas outlet 11 is lower than the height of the dust removal port 12, and the protective gas outlet 11 is closer to the welding surface. The inlet 9 and outlet 10 allow the laser emitted by the galvanometer to pass through the copper cup and weld the joint between the aluminum foil and the step through the outlet 10.

[0047] In one embodiment of the present invention, the laser-welded part is defocused by +2mm from the bottom to the welding surface, the welding speed is 80-100mm / s, the oscillation mode is spiral, and the welding length is 12mm; the protective gas flow rate is 10L / min, and the dust removal gas flow rate is 15m / s.

[0048] In one embodiment of the present invention, the protective gas is nitrogen.

[0049] The present invention will be further described below with reference to specific embodiments:

[0050] When welding 20 layers of aluminum foil, the power of the ring spot laser is set to 1200W core power and 800W ring power, and the welding speed is 100mm / s.

[0051] When welding 30 layers of aluminum foil, the power of the ring spot laser is set to 2000W core power and 1000W ring power, and the welding speed is 80mm / s.

[0052] When welding 40 layers of aluminum foil, the power of the ring spot laser is set to 3000W core power and 1200W ring power, and the welding speed is 80mm / s.

[0053] The ring-spot laser, camera, galvanometer, and rangefinder in this invention are all prior art, and those skilled in the art will already be aware of them, so they will not be described in detail here. The camera model can be Han's HPWELD-SCAN30 (dragon)-CCD, the galvanometer model can be Scanlab Hurryscan 30, and the rangefinder model can be Keyence IL300, but it is not limited to these.

[0054] The above description is only a preferred embodiment of the present invention and should not be construed as a limitation of this application. All equivalent changes and modifications made in accordance with the scope of the patent application of the present invention should be covered by the present invention.

Claims

1. A laser composite welding method suitable for multilayer aluminum foil tabs, characterized in that... This includes the following steps: Step S1: Stack multiple layers of aluminum foil flat, perform ultrasonic welding, and cut along the edge of the ultrasonic welding area. Step S2: Wipe the aluminum foil and battery top cover with alcohol to remove surface oil and dirt; Step S3: Place the battery top cover with the steps milled out by machining into the battery top cover fixing part of the laser composite welding device; Step S4: Place the multi-layer aluminum foil processed in step S1 at the step of the battery top cover, and use the copper cup of the laser composite welding device to press the aluminum foil and the step welding contact surface tightly. Step S5: Using the moving part of the laser composite welding device, the laser welding part of the laser composite welding device is brought to the welding working position of the welding contact surface between the aluminum foil and the step. Step S6: Weld the welding work position of the aluminum foil and the step through the laser welding part, and at the same time turn on the dust removal and protective gas, and blow the protective gas and dust removal into the welding work position through the copper cup. The laser composite welding device includes a worktable, a gantry frame is provided at the rear end of the upper surface of the worktable, a movable component is provided at the front side of the crossbar of the gantry frame, and a laser welding component is provided at the front side of the longitudinal movable seat of the movable component; a linear module is provided on the worktable, and a battery top cover fixing component is provided on the movable platform of the linear module, and the battery top cover fixing component is located below the laser welding component. The battery top cover fixing component includes a supporting base plate, a first telescopic cylinder, a supporting block, a connecting block, a supporting plate, a positioning plate, a clamping arm, a copper cup, a fixing block, a supporting column, equal-height bolts, a spring, and a limiting plate. The supporting base plate is mounted on the moving platform of the linear module. The first telescopic cylinders are mounted on both ends of the upper surface of the supporting base plate. A connecting block is fixed to the upper end of each first telescopic cylinder. The supporting plate is positioned between the two first telescopic cylinders. Both ends of the supporting plate are connected to the two connecting blocks. Supporting blocks are mounted around the upper surface of the supporting plate. The positioning plate is positioned above the supporting plate, and its lower surface is connected to the supporting block. The support plate is connected by a support block. The upper surface of the positioning plate has positioning protrusions around its perimeter for positioning the battery top cover. Both ends of the support plate have fixing blocks, and the support block is located between two fixing blocks. Both ends of the upper surface of the fixing block have support columns. The top of each support column is fixed with an equal-height bolt. A spring is fitted onto the stud of the equal-height bolt. A limiting plate is positioned above the two springs on the same side. Both ends of the limiting plate are fitted into the two equal-height bolts on the same side. The limiting plate has a placement groove that matches the battery top cover. The end of the telescopic rod of the first telescopic cylinder is provided with a clamping arm, and the end of the clamping arm is fixed with a copper cup.

2. The laser composite welding method for multilayer aluminum foil tabs according to claim 1, characterized in that: The moving component includes a first linear slide, a second linear slide, a transverse moving seat, a longitudinal moving seat, a first guide rail, a second guide rail, a first slider, and a second slider. The first linear slide is arranged along the length of the crossbar on the front side of the gantry frame. Two first guide rails are arranged along the length of the crossbar on the front side of the gantry frame. The first linear slide is located between the two first guide rails. The transverse moving seat is fixed on the moving platform of the first linear slide. The first slider, matching the first guide rail, is arranged on the rear surface of the transverse moving seat. The first slider is slidably connected to the first guide rail. The second linear slide is longitudinally arranged on the front surface of the transverse moving seat. The second guide rail is longitudinally arranged on the front surface of the transverse moving seat. The second guide rail and the second linear slide are arranged side-by-side. The longitudinal moving seat is arranged on the front surface of the moving platform of the second linear slide. The second slider, matching the second guide rail, is arranged on the rear surface of the longitudinal moving seat. The second slider is slidably connected to the second guide rail. The laser-welded component is arranged on the front surface of the longitudinal moving seat.

3. The laser composite welding method for multilayer aluminum foil tabs according to claim 2, characterized in that: Limit blocks are provided at both ends of the front side of the crossbar of the gantry frame. The limit blocks are located between the two first guide rails, and the first linear slide is located between the two limit blocks.

4. The laser composite welding method for multilayer aluminum foil tabs according to claim 1, characterized in that: The laser-welded component includes a ring-shaped laser, a galvanometer, a camera, a rangefinder, and a dust removal tube. The ring-shaped laser and the camera are located on the front side of the longitudinal moving base of the movable component. The camera and the ring-shaped laser are positioned to the left and right of each other. The output end of the ring-shaped laser is connected to the galvanometer via an optical fiber. The dust removal tube is located on the front side of the ring-shaped laser, and the rangefinder is located on the front side of the dust removal tube. The battery top cover fixing component is located below the galvanometer and the camera.

5. The laser composite welding method for multilayer aluminum foil tabs according to claim 1, characterized in that: A battery protective cover is fixed to the positioning plate by fixing bolts.

6. The laser composite welding method for multilayer aluminum foil tabs according to claim 1, characterized in that: The copper cup includes an inverted trapezoidal cavity with an inlet at the top and an outlet at the bottom. A protective gas outlet is located on one side of the inverted trapezoidal cavity, and a dust removal port is located on the other side of the inverted trapezoidal cavity. The dust removal port is connected to the dust removal pipe.

7. The laser composite welding method for multilayer aluminum foil tabs according to claim 1, characterized in that: The laser-welded part has a defocus distance of +2mm from the bottom to the welding surface, a welding speed of 80-100mm / s, a spiral oscillation method, and a welding length of 12mm; the shielding gas flow rate is 10L / min, and the dust removal gas flow rate is 15m³ / min. 3 / s.

8. The laser composite welding method for multilayer aluminum foil tabs according to claim 1, characterized in that: The protective gas is nitrogen.

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