An automatic welding system for the tabs of the pole pieces of a multi-layer structure

Abstract

The application discloses a kind of automatic welding systems of pole piece tab of multilayer structure, including A face foil unwinding mechanism, composite current collector unwinding mechanism, B face foil unwinding mechanism, roll material meeting mechanism, ultrasonic wave rolling welding mechanism, welding mark flattening mechanism, active traction mechanism and winding mechanism, A face foil, composite current collector and B face foil that A face foil unwinding mechanism output, composite current collector unwinding mechanism output and B face foil unwinding mechanism output are converged and aligned after roll material meeting mechanism convergence, by ultrasonic wave rolling welding mechanism, two sides are rolled and welded, A face foil and B face foil are welded in the tab end A, B face of composite current collector respectively, form two sides foil composite current collector, welding mark flattening mechanism flattens the welding mark on two sides foil composite current collector, winding mechanism winds two sides foil composite current collector.The application is highly integrated, reduces the occupied space of equipment, equipment investment cost, belt path length, improves welding quality and welding speed.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and more specifically to an automatic welding system for multi-layer electrode tabs. Background Technology

[0002] In lithium battery production, metal foil is typically used as the current collector, with aluminum foil chosen for the positive electrode and copper foil for the negative electrode. To improve battery energy density and safety, a composite current collector, consisting of a polymer film and a metal coating, has gained increasing attention. However, because the composite current collector includes an insulating layer made of polymer materials, its tabs cannot directly transmit current from the battery cell to the electrode terminals. Therefore, it is necessary to use foil (aluminum or copper foil) to connect to the tabs of the composite current collector in order to transfer the current from the battery cell.

[0003] Chinese utility model patent CN207868297U discloses a processing device for a secondary battery current collector, including a foil unwinding roller; a composite current collector unwinding roller; a first welding device and a second welding device; and a take-up roller. The first welding device is configured to weld the foil to one side of the tab of the composite current collector, and the second welding device is configured to weld the foil to the other side of the tab. The take-up roller takes up the composite current collector with foil welded to both sides. In this solution, the first and second welding devices can respectively weld the foil to both sides of the tab of the composite current collector, allowing the foil to be used as the tab of the composite current collector. Through the transfer of the foil, the current in the battery cell can be transmitted. However, the above solution requires two sets of welding devices to weld the foil to both sides of the tab of the composite current collector, resulting in a large overall equipment volume and requiring many rollers, leading to high equipment costs.

[0004] The above-mentioned defects need to be improved. Summary of the Invention

[0005] In order to overcome the problems of large overall equipment volume, large number of rollers required, and high equipment cost in the processing equipment of secondary battery current collectors in the existing technology, the present invention provides an automatic welding system for multi-layer electrode tabs.

[0006] The technical solution of this invention is as follows:

[0007] An automatic welding system for multi-layer electrode tabs includes an A-side foil unwinding mechanism, a composite current collector unwinding mechanism, a B-side foil unwinding mechanism, a roll-to-roll mechanism, an ultrasonic rolling welding mechanism, a weld stamp flattening mechanism, an active traction mechanism, and a winding mechanism. The A-side foil output from the A-side foil unwinding mechanism, the composite current collector output from the composite current collector unwinding mechanism, and the B-side foil output from the B-side foil unwinding mechanism are aligned and joined at the roll-to-roll mechanism. Then, the ultrasonic rolling welding mechanism performs double-sided rolling welding, welding the A-side foil and the B-side foil to the tab ends A and B of the composite current collector, respectively, forming a double-sided foil-padded composite current collector. The weld stamp flattening mechanism flattens the weld stamps on the double-sided foil-padded composite current collector. The active traction mechanism provides power for the movement of the double-sided foil-padded composite current collector. The winding mechanism winds up the double-sided foil-padded composite current collector.

[0008] According to the above-described automatic welding system for multi-layer electrode tabs, the automatic welding system for multi-layer electrode tabs further includes a first tension control mechanism for controlling the tension of the A-side foil, a second tension control mechanism for controlling the tension of the composite current collector, and a third tension control mechanism for controlling the tension of the B-side foil. The first tension control mechanism is disposed between the A-side foil unwinding mechanism and the roll-to-roll assembly mechanism, the second tension control mechanism is disposed between the composite current collector unwinding mechanism and the roll-to-roll assembly mechanism, and the third tension control mechanism is disposed between the B-side foil unwinding mechanism and the roll-to-roll assembly mechanism.

[0009] According to the above-described multi-layer electrode tab automatic welding system, the welding stamp flattening mechanism includes an upper pressure roller, a lower pressure roller, a pressure roller drive motor, and a flattening cylinder. The double-sided foil-repair composite current collector passes between the upper and lower pressure rollers. The drive shaft of the pressure roller drive motor is connected to the rotating shaft of the upper pressure roller and drives the upper pressure roller to rotate. The linear velocity of the upper pressure roller is the same as the linear velocity of the active traction mechanism. The telescopic end of the flattening cylinder is connected to one side of the upper pressure roller and drives the upper pressure roller to press against the lower pressure roller, flattening the welding stamp on the double-sided foil-repair composite current collector.

[0010] Furthermore, the welding stamping flattening mechanism also includes a pressure roller fixing side plate and a pressure roller adjusting side plate. The pressure roller adjusting side plate is located on the front side of the pressure roller fixing side plate and can slide left and right along the length direction of the pressure roller fixing side plate. The pressure roller drive motor is located on the front side of the pressure roller adjusting side plate through a motor mounting plate and can slide up and down along the height direction of the pressure roller adjusting side plate. The flattening cylinder is connected to the pressure roller adjusting side plate through a cylinder locking block.

[0011] Furthermore, a first transverse slider is provided on the rear side of the pressure roller adjusting side plate, and a groove for the first slider to slide is provided on the front side of the pressure roller fixing side plate.

[0012] Furthermore, the length of the first slider is the same as the length of the pressure roller adjusting side plate.

[0013] Furthermore, a bearing seat is installed on the side of the upper pressure roller near the pressure roller drive motor. The bearing seat is connected to the motor mounting plate through the pressure roller plate. The telescopic end of the flattening cylinder is connected to the bearing seat through the cylinder top block.

[0014] Furthermore, a longitudinal second slider is provided on the rear side of the pressure roller plate, and a slide rail for sliding the second slider is provided on the front side of the pressure roller adjusting side plate.

[0015] Furthermore, a fine-tuning mechanism for fine-tuning the position of the pressure roller adjusting side plate is provided on the left and / or right sides of the pressure roller adjusting side plate.

[0016] Furthermore, the fine-tuning mechanism includes a fine-tuning screw and an adjustment bracket, the adjustment bracket being connected to the pressure roller fixing side plate, and the adjustment bracket having screw holes that mate with the fine-tuning screw.

[0017] Furthermore, each of the four corners of the pressure roller adjusting side plate is provided with a horizontal elongated hole, and the pressure roller fixing side plate is provided with a number of parallel fixing holes corresponding to the four elongated holes. The elongated holes and the corresponding fixing holes are fitted with screws to fix the pressure roller adjusting side plate and the pressure roller fixing side plate.

[0018] Furthermore, the cylinder locking block is provided with a cylinder extension and retraction limiting mechanism that limits the maximum extension length of the flattening cylinder.

[0019] Furthermore, the cylinder extension and retraction limiting mechanism includes a limiting screw, the lower end of the stud of the limiting screw passes through a through hole provided on the cylinder locking block, the upper end of the stud of the limiting screw is threaded with an upper limit adjusting nut, and the lower end of the stud of the limiting screw is threaded with a lower limit adjusting nut.

[0020] Furthermore, the drive shaft of the pressure roller drive motor is connected to the rotating shaft of the upper pressure roller via a first coupling.

[0021] Furthermore, the width of the upper pressure roller is matched with the width of the solder mark on the two-sided foil composite current collector.

[0022] According to the above-described automatic welding system for multi-layer electrode tabs, the automatic welding system for multi-layer electrode tabs further includes a fourth tension control mechanism for controlling the tension of the two-sided foil composite current collector before the solder stamp is flattened, and a fifth tension control mechanism for controlling the tension of the two-sided foil composite current collector after the solder stamp is flattened. The fourth tension control mechanism is disposed between the ultrasonic rolling welding mechanism and the solder stamp flattening mechanism, and the fifth tension control mechanism is disposed between the active traction mechanism and the winding mechanism.

[0023] According to the above-described automatic welding system for multi-layer electrode tabs, the system further includes a first unwinding correction sensor for detecting whether the unwinding position of the A-side foil is offset, a second unwinding correction sensor for detecting whether the unwinding position of the composite current collector is offset, and a third unwinding correction sensor for detecting whether the unwinding position of the B-side foil is offset. The first unwinding correction sensor is disposed between the A-side foil unwinding mechanism and the roll-to-roll assembly mechanism, the second unwinding correction sensor is disposed between the composite current collector unwinding mechanism and the roll-to-roll assembly mechanism, and the third unwinding correction sensor is disposed between the B-side foil unwinding mechanism and the roll-to-roll assembly mechanism. The A-side foil unwinding mechanism is provided with a first unwinding correction mechanism for correcting the unwinding position of the A-side foil, the composite current collector unwinding mechanism is provided with a second unwinding correction mechanism for correcting the unwinding position of the composite current collector, and the B-side foil unwinding mechanism is provided with a third unwinding correction mechanism for correcting the unwinding position of the B-side foil.

[0024] According to the above-described automatic welding system for multi-layer electrode tabs, the automatic welding system for multi-layer electrode tabs further includes a winding correction sensor for detecting whether the winding position of the two-sided foil composite current collector is offset. The winding correction sensor is disposed between the active traction mechanism and the winding mechanism. The winding mechanism is provided with a winding correction mechanism for correcting the winding position of the two-sided foil composite current collector.

[0025] According to the above-described multi-layer electrode tab automatic welding system, the ultrasonic rolling welding mechanism includes an upper rolling welding assembly and a lower bearing welding assembly. The A-side foil, the composite current collector, and the B-side foil pass between the upper rolling welding assembly and the lower bearing welding assembly, and the wrap angle of the A-side foil, the composite current collector, and the B-side foil through the lower bearing welding assembly is 0-180°.

[0026] Furthermore, the upper roller welding assembly includes a welding wheel, an ultrasonic generator, and a welding wheel motor. The ultrasonic generator and the welding wheel motor are respectively disposed on both sides of the welding wheel. The vibration output end of the ultrasonic generator is connected to one side of the rotating shaft of the welding wheel, and the output shaft of the welding wheel motor is connected to the other side of the rotating shaft of the welding wheel and drives the welding wheel to rotate. The linear velocity of the welding wheel is the same as the linear velocity of the active traction mechanism.

[0027] The lower welding assembly includes a welding roller and a composite current collector roller arranged side by side. The welding roller is located directly below the welding roller. The welding portions of the A-side foil, the composite current collector, and the B-side foil pass between the welding roller and the welding roller. The main body of the composite current collector passes through the composite current collector roller.

[0028] Furthermore, the height difference between the highest point of the welding roller and the highest point of the composite current collector roller is equal to half the thickness of the main body of the composite current collector minus the thickness of the B-side foil.

[0029] Furthermore, the upper roller welding assembly also includes a first reducer and a first coupling. The output shaft of the welding wheel motor is connected to one end of the first reducer, and the other end of the first reducer is connected to the rotating shaft of the welding wheel through the first coupling.

[0030] Furthermore, the ultrasonic rolling welding mechanism also includes a welding bracket, which includes a welding base plate and welding side plates disposed on the welding base plate. Side plate reinforcing ribs are provided on both sides of the back of the welding side plates. The upper rolling welding assembly is mounted on the welding side plates, and the lower bearing welding assembly is mounted on the welding base plate.

[0031] Furthermore, the ultrasonic rolling welding mechanism also includes a scraper assembly for scraping off the adhesive on the surface of the welding wheel, the scraper assembly being disposed on one side of the welding wheel.

[0032] Furthermore, the ultrasonic rolling welding mechanism also includes a bearing adjustment component for driving the lower bearing assembly to move up and down, the bearing adjustment component being disposed below the lower bearing assembly.

[0033] Furthermore, the welding adjustment assembly includes two vertically upward-facing adjustment cylinders respectively disposed below both ends of the welding shaft core, and the extension and retraction ends of the two adjustment cylinders are respectively connected to both ends of the lower welding assembly.

[0034] Furthermore, the lower welding assembly also includes a welding shaft core and shaft core locking seats disposed at both ends of the welding shaft core. The welding wheel is sleeved on the welding shaft core and can rotate along the central axis of the welding shaft core. An eccentric outer circular step is provided on the welding shaft core. The central axis of the outer circular step is not coaxial with the central axis of the welding shaft core. The composite current collector roller is sleeved on the outer circular step and can rotate along the central axis of the outer circular step.

[0035] Furthermore, the distance between the central axis of the outer circular step and the central axis of the welding core is 0.3-1mm.

[0036] Furthermore, the distance between the central axis of the outer circular step and the central axis of the welding core is 0.5-1mm.

[0037] Furthermore, a welding wheel seat is provided at the connection between the welding wheel and the welding shaft core. The welding wheel seat is sleeved outside the welding shaft core and can rotate along the central axis of the welding shaft core. The welding wheel is sleeved outside the welding wheel seat and fixed to the welding wheel seat. The inner side of the welding wheel seat is located inside the composite current collector roller.

[0038] Furthermore, the welding wheel seat is sleeved outside the welding shaft core via a bearing and can rotate along the central axis of the welding shaft core.

[0039] Furthermore, an electrode lug seat is provided on the outer side of the welding wheel, and the electrode lug seat, the welding wheel and the welding wheel seat are fixed together by screws, and the outer diameter of the electrode lug seat is the same as the outer diameter of the welding wheel.

[0040] Furthermore, the electrode holder is provided with a plurality of first screw holes in the circumferential direction, the welding wheel is provided with a plurality of second screw holes in the circumferential direction corresponding to the first screw holes, and the inner circumferential side of the welding wheel holder is provided with a plurality of third screw holes corresponding to the first screw holes. Screws pass through the corresponding first screw holes, second screw holes and third screw holes to fix the electrode holder, the welding wheel and the welding wheel holder together.

[0041] Furthermore, the composite current collector roller is sleeved on the outer circular step via a bearing.

[0042] Furthermore, at least two outer circular steps are provided on the welding shaft core.

[0043] Furthermore, at least one end of the welding shaft passes through the corresponding shaft locking seat, and the part that passes through is provided with an adjustment groove that cooperates with the eccentric adjustment tool to rotate the welding shaft.

[0044] Furthermore, the shaft locking seat includes an upper locking block and a lower fixed base. The joint between the upper locking block and the lower fixed base is provided with locking holes that mate with both ends of the weldable shaft. The upper locking block is connected to the lower fixed base by screws and locks the weldable shaft in the locking holes.

[0045] Furthermore, the upper locking block is provided with a fourth screw hole at each of its four corners, and the lower fixing base is provided with a fifth screw hole at each of its four top corners that mates with the corresponding fourth screw hole. The screw passes through the corresponding fourth screw hole and the fifth screw hole to fix the upper locking block and the lower fixing base together.

[0046] Furthermore, a load-bearing wheel assembly is provided below the welding wheel. The load-bearing wheel assembly includes a load-bearing base and two load-bearing wheels rotatably mounted on the load-bearing base. The wheel surfaces of the two load-bearing wheels respectively contact the two sides of the lower wheel surface of the welding wheel.

[0047] Furthermore, the wheel surface width of the load-bearing wheel is the same as that of the welding wheel.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0049] The multi-layer electrode tab automatic welding system provided by this invention can weld the A-side foil and the B-side foil to the tab ends A and B of the composite current collector respectively using only an ultrasonic rolling welding mechanism and a coil converging mechanism. This high level of integration reduces the number of rollers, the space occupied by the equipment, significantly reduces equipment investment costs, shortens the conveyor belt path, and minimizes the impact of the external environment on the product. The winding and unwinding mechanism, in conjunction with an active traction mechanism, a tension control mechanism, and a winding and unwinding correction sensor, controls the movement of the coil, ensuring stable welding speed and precise positioning, thus improving both welding quality and speed. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the structure of the present invention;

[0052] Figure 2 This is a cross-sectional view of the double-sided foil composite current collector in this invention;

[0053] Figure 3This is a side view of the upper and lower pressure rollers of the welding stamping and flattening mechanism in this invention;

[0054] Figure 4 This is a schematic diagram of the welding stamping flattening mechanism of the present invention without the lower pressure roller;

[0055] Figure 5 This is a front view of the welding stamping and flattening mechanism of the present invention without the lower pressure roller;

[0056] Figure 6 This is a top view of the welding stamping flattening mechanism of the present invention without the lower pressure roller;

[0057] Figure 7 This is a schematic diagram of the ultrasonic rolling welding mechanism in this invention;

[0058] Figure 8 This is a front view of the ultrasonic rolling welding mechanism in this invention;

[0059] Figure 9 This is a schematic diagram of the lower bearing welding assembly of the ultrasonic rolling welding mechanism in this invention;

[0060] Figure 10 This is a cross-sectional view of the lower bearing assembly of the ultrasonic rolling welding mechanism in this invention.

[0061] Figure 11 This is a side view of the bearing shaft of the lower bearing welding assembly in this invention;

[0062] Figure 12 This is a front view of the bearing shaft of the lower bearing welding assembly in this invention;

[0063] Figure 13 for Figure 12 A cross-sectional view of HH;

[0064] Figure 14 This is a schematic diagram of the load-bearing wheel assembly of the lower bearing welding assembly in this invention.

[0065] In the diagram,

[0066] 1. A-side foil unwinding mechanism; 2. Composite current collector unwinding mechanism; 3. B-side foil unwinding mechanism; 4. Coil assembly mechanism; 5. Ultrasonic rolling welding mechanism; 501. Upper rolling welding assembly; 5011. Welding wheel; 5012. Ultrasonic generator; 5013. Welding wheel motor; 5014. First reducer; 5015. Second coupling; 502. Lower bearing welding assembly; 5021. Bearing welding wheel; 5022. Composite current collector guide roller; 5023. Bearing welding shaft; 50231. Outer circular step; 50232. Adjusting groove; 5024. Shaft locking seat 50241. Upper locking block; 50242. Lower fixed base; 5025. Welding wheel seat; 5026. Pole lug seat; 5027. Load-bearing wheel assembly; 50271. Load-bearing base; 50272. Load-bearing wheel; 503. Welding bracket; 5031. Welding base plate; 5032. Welding side plate; 5033. Side plate reinforcing rib; 504. Scraper assembly; 505. Welding adjustment assembly; 5051. Adjusting cylinder; 6. Active traction mechanism; 7. Winding mechanism; 8. Welding stamp flattening mechanism; 801. Upper pressure roller; 802. Lower pressure roller; 803. Pressure roller Drive motor; 804, flattening cylinder; 805, first coupling; 806, pressure roller fixing side plate; 8061, slide groove; 8062, fixing hole; 807, pressure roller adjusting side plate; 8071, first slider; 8072, slide rail; 8073, elongated hole; 808, motor mounting plate; 809, cylinder locking block; 810, bearing seat; 811, pressure roller plate; 8111, second slider; 812, cylinder top block; 813, fine-tuning mechanism; 8131, fine-tuning screw; 8132, adjusting bracket; 814, cylinder telescopic limit mechanism; 8141 8142. Limit screw; 8143. Upper limit adjusting nut; 81444. Lower limit adjusting nut; 9. First tension control mechanism; 10. Second tension control mechanism; 11. Third tension control mechanism; 12. Fourth tension control mechanism; 13. Fifth tension control mechanism; 14. First unwinding correction sensor; 15. Second unwinding correction sensor; 16. Third unwinding correction sensor; 17. Rewinding correction sensor; 18. Orientation roller; 100. A-side foil; 200. Composite current collector; 300. B-side foil; 400. Double-sided foil-repairing composite current collector. Detailed Implementation

[0067] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It is also stated that the embodiments described below are for illustrative purposes only and are not intended to limit the invention.

[0068] It should be noted that the terms "installation", "setup", "connection", and "fixation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components, unless otherwise explicitly defined.

[0069] The orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art, and is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying a number of technical features. "A plurality of" means two or more, unless otherwise expressly specified. "Several" means one or more, unless otherwise expressly specified.

[0070] Please see Figure 1 , Figure 2 This embodiment provides an automatic welding system for multi-layer electrode tabs, including an A-side foil unwinding mechanism 1, a composite current collector unwinding mechanism 2, a B-side foil unwinding mechanism 3, a roll-to-roll assembly mechanism 4, an ultrasonic rolling welding mechanism 5, an active traction mechanism 6, and a rewinding mechanism 7. The A-side foil unwinding mechanism 1, the composite current collector unwinding mechanism 2, and the B-side foil unwinding mechanism 3 are arranged sequentially from top to bottom and are located on one side of the roll-to-roll assembly mechanism 4. The ultrasonic rolling welding mechanism 5, the active traction mechanism 6, and the rewinding mechanism 7 are arranged sequentially on the other side of the roll-to-roll assembly mechanism 4.

[0071] During operation, the A-side foil 100 output from the A-side foil unwinding mechanism 1, the composite current collector 200 output from the composite current collector unwinding mechanism 2, and the B-side foil 300 output from the B-side foil unwinding mechanism 3 are aligned and joined by the roll material merging mechanism 4. Then, they are subjected to double-sided rolling welding by the ultrasonic rolling welding mechanism 5, which welds the A-side foil 100 and the B-side foil 300 to the tab ends A and B of the composite current collector 200, respectively. This allows the A-side foil 100 and the B-side foil 300 to be used as tabs of the composite current collector 200, forming a double-sided foil-replenishing composite current collector 400. The active traction mechanism 6 provides power for the movement of the double-sided foil-replenishing composite current collector 400, and finally, the winding mechanism 7 winds up the double-sided foil-replenishing composite current collector 400.

[0072] In this embodiment, the roll converging mechanism 4 is a roll converging roller used to converge and align three types of rolls: A-side foil 100, composite current collector 200, and B-side foil 300. It has a simple structure and is easy to implement.

[0073] Please see Figure 1 Since the weld marks formed after welding the three types of coils of foil 100 (A side), composite current collector 200, and foil 300 (B side) are generally uneven and not flat enough, it will affect the subsequent winding and the quality of the final product. The multi-layer structure electrode tab automatic welding system of this embodiment also includes a weld mark flattening mechanism 8 for flattening the weld marks on the two-sided foil-filled composite current collector 400. The weld mark flattening mechanism 8 is set between the ultrasonic rolling welding mechanism 5 and the active traction mechanism 6. After passing through the weld mark flattening mechanism 8 and the active traction mechanism 6, the two-sided foil-filled composite current collector 400 is wound into the winding mechanism 7.

[0074] Please see Figures 3 to 6 Specifically, the solder stamping flattening mechanism 8 includes an upper pressure roller 801, a lower pressure roller 802, a pressure roller drive motor 803, and a flattening cylinder 804. The double-sided foil-repaired composite current collector 400 passes between the upper pressure roller 801 and the lower pressure roller 802. The drive shaft of the pressure roller drive motor 803 is connected to the rotating shaft of the upper pressure roller 801 through a first coupling 805 and drives the upper pressure roller 801 to rotate, making the linear speed of the upper pressure roller 801 the same as the linear speed of the active traction mechanism 6. The telescopic end of the flattening cylinder 804 is connected to one side of the upper pressure roller 801 and drives the upper pressure roller 801 to press down on the lower pressure roller 802, thereby flattening the solder stamp on the double-sided foil-repaired composite current collector 400. The pressure roller drive motor 803 drives the upper pressure roller 801 to rotate, and makes the linear speed of the upper pressure roller 801 the same as the linear speed of the active traction mechanism 6. This can prevent the upper pressure roller 801 from tearing the solder marks on the two-sided foil composite current collector 400 when it cooperates with the lower pressure roller 802 to flatten them.

[0075] Furthermore, the width of the upper pressure roller 801 is matched with the width of the solder mark on the two-sided foil-repair composite current collector 400, so that when the upper pressure roller 801 presses down, it only presses down on the solder mark on the two-sided foil-repair composite current collector 400, thereby achieving a better flattening effect. The width of the lower pressure roller 802 is matched with the width of the two-sided foil-repair composite current collector 400, and the lower pressure roller 802 serves to support the two-sided foil-repair composite current collector 400.

[0076] Please see Figures 4 to 6Furthermore, the welding stamping and flattening mechanism 8 also includes a pressure roller fixing side plate 806 and a pressure roller adjusting side plate 807. The pressure roller adjusting side plate 807 is located on the front side of the pressure roller fixing side plate 806 and can slide left and right along the length direction of the pressure roller fixing side plate 806. The pressure roller drive motor 803 is located on the front side of the pressure roller adjusting side plate 807 through a motor mounting plate 808 and can slide up and down along the height direction of the pressure roller adjusting side plate 807. The flattening cylinder 804 is connected to the pressure roller adjusting side plate 807 through a cylinder locking block 809. With the above-mentioned pressure roller fixing side plate 806 and pressure roller adjusting side plate 807, the position of the pressure roller adjusting side plate 807 can be adjusted according to the position of the welding stamp on the two-sided foil composite current collector 400, thereby adjusting the position of the upper pressure roller 801 so that the upper pressure roller 801 is positioned directly above the welding stamp.

[0077] Please see Figures 4 to 6 Furthermore, a first transverse slider 8071 is provided on the rear side of the pressure roller adjusting side plate 807, and a groove 8061 is provided on the front side of the pressure roller fixing side plate 806 for the first slider 8071 to slide. Through the cooperation between the first slider 8071 and the groove 8061, the pressure roller fixing side plate 806 can be stably slid left and right along the length direction of the pressure roller fixing side plate 806, thereby adjusting the position of the upper pressure roller 801. The length of the first slider 8071 is the same as the length of the pressure roller adjusting side plate 807, which makes the sliding of the pressure roller adjusting side plate 807 more stable.

[0078] Please see Figures 4 to 6 Furthermore, a bearing seat 810 is installed on the side of the upper pressure roller 801 near the pressure roller drive motor 803. The bearing seat 810 is connected to the motor mounting plate 808 through the pressure roller plate 811. The telescopic end of the flattening cylinder 804 is connected to the bearing seat 810 through the cylinder top block 812. The bearing seat 810 serves to support the upper pressure roller 801. A longitudinal second slider 8111 is provided on the rear side of the pressure roller plate 811, and a slide rail 8072 is provided on the front side of the pressure roller adjusting side plate 807 for the second slider 8111 to slide on. Through the cooperation between the second slider 8111 and the slide rail 8072, the upper pressure roller 801 and the pressure roller drive motor 803 can slide stably up and down along the height direction of the pressure roller adjusting side plate 807.

[0079] Please see Figure 6Furthermore, a fine-tuning mechanism 813 for fine-tuning the position of the pressure roller adjusting side plate 807 is provided on the left and / or right sides of the pressure roller adjusting side plate 807. Since the upper pressure roller 801 is mounted on the pressure roller adjusting side plate 807, the position of the upper pressure roller 801 is simultaneously fine-tuned when the pressure roller adjusting side plate 807 is fine-tuned. Specifically, the fine-tuning mechanism 813 includes a fine-tuning screw 8131 and an adjusting bracket 8132. The adjusting bracket 8132 is connected to the pressure roller fixing side plate 806, and the adjusting bracket 8132 is provided with a screw hole that mates with the fine-tuning screw 8131. When fine-tuning the position of the upper pressure roller 801, the fine-tuning screw 8131 is rotated, causing the fine-tuning screw 8131 to move left or right along the screw hole, thereby fine-tuning the position of the pressure roller adjusting side plate 807 through the fine-tuning screw 8131, and thus achieving the fine-tuning of the position of the upper pressure roller 801.

[0080] It should be understood that in other embodiments, a fine-tuning mechanism 813 may be provided separately on the left side of the pressure roller adjusting side plate 807, or a fine-tuning mechanism 813 may be provided on both the left and right sides of the pressure roller adjusting side plate 807. The present invention does not limit this, as long as it can achieve the function of fine-tuning the position of the pressure roller adjusting side plate 807.

[0081] Please see Figure 5 Furthermore, each of the four corners of the pressure roller adjusting side plate 807 is provided with a horizontal elongated hole 8073. The pressure roller fixing side plate 806 is provided with several parallel fixing holes 8062 corresponding to the four elongated holes 8073. After the position of the pressure roller adjusting side plate 807 is adjusted, the elongated holes 8073 and the corresponding fixing holes 8062 are engaged with screws to fix the pressure roller adjusting side plate 807 and the pressure roller fixing side plate 806, thereby fixing the position of the pressure roller adjusting side plate 807 and preventing the pressure roller adjusting side plate 807 from shifting during equipment operation, which would affect the flattening effect of the welding stamp.

[0082] Please see Figures 4 to 6Furthermore, the cylinder locking block 809 is equipped with a cylinder extension limiting mechanism 814 to limit the maximum extension length of the flattening cylinder 804, thereby controlling the downward pressure of the upper pressure roller 801. Specifically, the cylinder extension limiting mechanism 814 includes a limiting screw 8141, the lower end of the stud of the limiting screw 8141 passing through a through hole provided on the cylinder locking block 809, the upper end of the stud of the limiting screw 8141 being threadedly connected to an upper limit adjusting nut 8142, and the lower end of the stud of the limiting screw 8141 being threadedly connected to a lower limit adjusting nut 8143. The distance between the upper limit adjusting nut 8142 and the lower limit adjusting nut 8143 is the maximum extension length of the flattening cylinder 804. When it is necessary to adjust the downward pressure of the upper pressure roller 801, rotate the upper limit adjusting nut 8142 and / or rotate the lower limit adjusting nut 8143 to adjust the distance between the upper limit adjusting nut 8142 and the lower limit adjusting nut 8143. The greater the distance between the upper limit adjusting nut 8142 and the lower limit adjusting nut 8143, the greater the downward pressure of the upper pressure roller 801; the smaller the distance between the upper limit adjusting nut 8142 and the lower limit adjusting nut 8143, the smaller the downward pressure of the upper pressure roller 801.

[0083] Please see Figure 1 In order to control the tension of the three types of coils—A-side foil 100, composite current collector 200, and B-side foil 300—and improve welding quality, the multi-layer structure electrode tab automatic welding system of this embodiment further includes a first tension control mechanism 9 for controlling the tension of A-side foil 100, a second tension control mechanism 10 for controlling the tension of composite current collector 200, and a third tension control mechanism 11 for controlling the tension of B-side foil 300. The first tension control mechanism 9 is located between the A-side foil unwinding mechanism 1 and the coil converging mechanism 4, the second tension control mechanism 10 is located between the composite current collector unwinding mechanism 2 and the coil converging mechanism 4, and the third tension control mechanism 11 is located between the B-side foil unwinding mechanism 3 and the coil converging mechanism 4.

[0084] Please see Figure 1 In order to control the tension of the composite current collector 400 with foil patching on both sides before and after the solder stamping is flattened, so as to improve the quality of solder stamping, the automatic welding system for electrode tabs with multi-layer structure in this embodiment also includes a fourth tension control mechanism 12 for controlling the tension of the composite current collector 400 with foil patching on both sides before solder stamping is flattened, and a fifth tension control mechanism 13 for controlling the tension of the composite current collector 400 with foil patching on both sides after solder stamping is flattened. The fourth tension control mechanism 12 is disposed between the ultrasonic rolling welding mechanism 5 and the solder stamping flattening mechanism 8, and the fifth tension control mechanism 13 is disposed between the active traction mechanism 6 and the winding mechanism 7.

[0085] Please see Figure 1To improve welding quality and speed, the multi-layer electrode tab automatic welding system of this embodiment further includes a first unwinding correction sensor 14 for detecting whether the unwinding position of the A-side foil 100 is offset, a second unwinding correction sensor 15 for detecting whether the unwinding position of the composite current collector 200 is offset, and a third unwinding correction sensor 16 for detecting whether the unwinding position of the B-side foil 300 is offset. The first unwinding correction sensor 14 is disposed between the A-side foil unwinding mechanism 1 and the coil converging mechanism 4, and the second unwinding correction sensor 16 is disposed between the A-side foil unwinding mechanism 1 and the coil converging mechanism 4. Sensor 15 is positioned between the composite current collector unwinding mechanism 2 and the roll assembly mechanism 4. A third unwinding correction sensor 16 is positioned between the B-side foil unwinding mechanism 3 and the roll assembly mechanism 4. The A-side foil unwinding mechanism 1 is equipped with a first unwinding correction mechanism for correcting the unwinding position of the A-side foil 100. The composite current collector unwinding mechanism 2 is equipped with a second unwinding correction mechanism for correcting the unwinding position of the composite current collector 200. The B-side foil unwinding mechanism 3 is equipped with a third unwinding correction mechanism for correcting the unwinding position of the B-side foil 300. The A-side foil 100 output from the A-side foil unwinding mechanism 1, the composite current collector 200 output from the composite current collector unwinding mechanism 2, and the B-side foil 300 output from the B-side foil unwinding mechanism 3 are automatically corrected by the first, second, and third unwinding correction mechanisms, respectively, and then converged and aligned at the roll assembly mechanism 4.

[0086] Please see Figure 1 To prevent the position of the two-sided foil-padded composite current collector 400 from shifting during the winding process, the multi-layer structure electrode tab automatic welding system of this embodiment also includes a winding correction sensor 17 for detecting whether the winding position of the two-sided foil-padded composite current collector 400 has shifted. The winding correction sensor 17 is disposed between the active traction mechanism 6 and the winding mechanism 7. The winding mechanism 7 is provided with a winding correction mechanism for correcting the winding position of the two-sided foil-padded composite current collector 400.

[0087] Please see Figure 7 , Figure 8In this embodiment, the ultrasonic rolling welding mechanism 5 includes an upper rolling welding assembly 501, a lower bearing welding assembly 502, and a welding bracket 503. The welding bracket 503 includes a welding base plate 5031 and welding side plates 5032 disposed on the welding base plate 5031. Side plate reinforcing ribs 5033 are provided on both sides of the back of the welding side plate 5032 to improve the structural strength of the welding bracket 503. The upper rolling welding assembly 501 is mounted on the welding side plate 5032, and the lower bearing welding assembly 502 is mounted on the welding base plate 5031. When the A-side foil 100, the composite current collector 200, and the B-side foil 300 pass between the upper roll welding assembly 501 and the lower bearing welding assembly 502, they are subjected to double-sided roll welding under the action of the upper roll welding assembly 501 and the lower bearing welding assembly 502. The A-side foil 100 and the B-side foil 300 are respectively welded to the tab ends A and B of the composite current collector 200, so that the A-side foil 100 and the B-side foil 300 can be used as tabs of the composite current collector 200, forming a double-sided foil-repaired composite current collector 400. Among them, the A-side foil 100, the composite current collector 200, and the B-side foil 300 can pass horizontally through the lower welding assembly 502, that is, the wrap angle of the A-side foil 100, the composite current collector 200, and the B-side foil 300 through the lower welding assembly 502 is 0°, or they can have a certain wrap angle with the lower welding assembly 502 when passing through it, that is, the wrap angle of the A-side foil 100, the composite current collector 200, and the B-side foil 300 through the lower welding assembly 502 is greater than 0°, which can increase the A-side foil 100's... The friction between the composite current collector 200 and the B-side foil 300 and the lower welding assembly 502 is reduced to prevent the A-side foil 100, composite current collector 200, and B-side foil 300 from shifting during welding, thereby improving welding quality and speed. To facilitate the transport of the A-side foil 100, composite current collector 200, and B-side foil 300, the wrap angle of the A-side foil 100, composite current collector 200, and B-side foil 300 over the lower welding assembly 502 is no greater than 180°. Because the ultrasonic rolling welding mechanism 5 generates vibration during welding, if the A-side foil 100, composite current collector 200, and B-side foil 300 do not have a wrap angle with the lower welding assembly 502, the friction force on the A-side foil 100, composite current collector 200, and B-side foil 300 will be very small. Vibration will cause the A-side foil 100, composite current collector 200, and B-side foil 300 to shift, thus affecting the quality of the solder pads.

[0088] Please see Figure 8Specifically, the upper roller welding assembly 501 includes a welding wheel 5011, an ultrasonic generator 5012, a welding wheel motor 5013, a first reducer 5014, and a second coupling 5015. The ultrasonic generator 5012 and the welding wheel motor 5013 are respectively arranged on both sides of the welding wheel 5011. The vibration output end of the ultrasonic generator 5012 is connected to one side of the rotating shaft of the welding wheel 5011. The output shaft of the welding wheel motor 5013 is connected to one end of the first reducer 5014. The other end of the first reducer 5014 is connected to the other side of the rotating shaft of the welding wheel 5011 through the second coupling 5015, so that the welding wheel motor 5013 drives the welding wheel 5011 to rotate. In this design, the linear speed of the welding wheel 5011 is the same as that of the active traction mechanism 6. This allows the A-side foil 100, the composite current collector 200, and the B-side foil 300 to smoothly enter the ultrasonic rolling welding mechanism 5. During the welding process, the A-side foil 100, the composite current collector 200, and the B-side foil 300 will not be subjected to excessive pulling due to their conveying speed being too low compared to the linear speed of the welding wheel 5011, nor will they be prone to wrinkling due to their conveying speed being too high compared to the linear speed of the welding wheel 5011, thereby improving the welding quality.

[0089] Please see Figure 9 , Figure 10 Specifically, the lower welding assembly 502 includes a welding roller 5021 and a composite current collector roller 5022 arranged side by side. The welding roller 5021 is located directly below the welding roller 5011. The welding portions of the A-side foil 100, the composite current collector 200, and the B-side foil 300 pass between the welding roller 5011 and the welding roller 5021. The main body of the composite current collector 200 passes through the composite current collector roller 5022. The height difference between the highest point of the welding roller 5021 and the highest point of the composite current collector roller 5022 is equal to half the thickness of the main body of the composite current collector 200 minus the thickness of the B-side foil 300. Since the thickness of the tabs of the A-side foil 100, B-side foil 300, and composite current collector 200 after being stacked may differ from the thickness of the main body of composite current collector 200, if the same roller is used as the welding support, and the thickness of the tabs of the A-side foil 100, B-side foil 300, and composite current collector 200 after being stacked is different from the thickness of the main body of composite current collector 200, the tension and friction generated on one side of the tabs of the A-side foil 100, B-side foil 300, and composite current collector 200 after being stacked will be different from the tension and friction generated on one side of the main body of composite current collector 200 (i.e., the forces are different), the welding is prone to deviation, affecting the welding quality. By using the welding roller 5021 and the composite current collector roller 5022 as described above, it can be ensured that the tension and friction generated on one side of the overlapping tabs of the A-side foil 100, B-side foil 300 and composite current collector 200 are the same as the main body side of the composite current collector 200 during the welding process. This can effectively solve the welding deviation problem and thus improve the welding quality.

[0090] Ultrasonic welding can effectively penetrate the tab end of the composite current collector 200, and fuse the A-side foil 100 and B-side foil 300 with the metal layers of the tab end A and B respectively, so as to increase the metal thickness and enable the current in the battery cell to be reliably delivered from the fused part.

[0091] Please see Figure 7 , Figure 8 In this embodiment, the ultrasonic rolling welding mechanism 5 further includes a scraper assembly 504. The scraper assembly 504 is disposed on one side of the welding wheel 5021, and the scraper of the scraper assembly 504 is aligned with the wheel surface of the welding wheel 5021. There is a slight gap between the two, which on the one hand prevents the scraper from interfering with the wheel surface of the welding wheel 5021, and on the other hand scrapes off the adhesive on the wheel surface of the welding wheel 5021.

[0092] Please see Figure 7 , Figure 8 In this embodiment, the ultrasonic rolling welding mechanism 5 further includes a welding adjustment component 505. The welding adjustment component 505 is located below the lower welding component 502. The welding adjustment component 505 can drive the lower welding component 502 to move up and down, thereby adjusting the distance between the upper rolling welding component 501 and the lower welding component 502 according to the thickness of the roll material, to accommodate roll materials of different thicknesses and improve the versatility of the equipment. Specifically, the welding adjustment component 505 includes two vertically upward-facing adjustment cylinders 5051 respectively located below both ends of the welding shaft core 5023. The extension and retraction ends of the two adjustment cylinders 5051 are respectively connected to both ends of the lower welding component 502. By controlling the extension and retraction length of the two adjustment cylinders 5051, the height of the lower welding component 502 can be adjusted, thereby adjusting the distance between the upper rolling welding component 501 and the lower welding component 502.

[0093] Please see Figures 9 to 13In this embodiment, the lower welding assembly 502 further includes a welding shaft core 5023 and shaft core locking seats 5024 disposed at both ends of the welding shaft core 5023. The welding wheel 5021 is sleeved on the welding shaft core 5023 and can rotate along the central axis of the welding shaft core 5023. An eccentric outer circular step 50231 is provided on the welding shaft core 5023. The central axis of the outer circular step 50231 is not coaxial with the central axis of the welding shaft core 5023. The composite current collector roller 5022 is sleeved on the outer circular step 50231 and can rotate along the outer circular step 50233. The central axis of step 50231 can rotate. By setting an outer circular step 50231 on the welding shaft core 5023 that is not coaxial with the welding shaft core 5023, rotating the welding shaft core 5023 changes the height of the composite current collector roller 5022 sleeved on the outer circular step 50231. This allows adjustment of the height difference between the highest point of the composite current collector roller 5022 and the highest point of the welding wheel 5021, accommodating different thicknesses of A-side foil 100, B-side foil 300, and composite current collector 200, thus improving the equipment's versatility. The shaft core locking seat 5024 is used to lock the welding shaft core 5023, preventing it from rotating during welding. The shaft core locking seat 5024 only releases the welding shaft core 5023 when it is necessary to adjust the height difference between the highest point of the composite current collector roller 5022 and the highest point of the welding wheel 5021, allowing the welding shaft core 5023 to rotate freely.

[0094] Furthermore, the distance between the central axis of the outer circular step 50231 and the central axis of the welding core 5023 is 0.3-1mm. Preferably, the distance between the central axis of the outer circular step 50231 and the central axis of the welding core 5023 is 0.5-1mm, so that the height adjustment range of the composite current collector roller 5022 meets the requirements of most A-side foil 100, B-side foil 300 and composite current collector 200 on the market.

[0095] Please see Figure 9 , Figure 10Furthermore, a welding wheel seat 5025 is provided at the connection between the welding wheel 5021 and the welding shaft core 5023. The welding wheel seat 5025 is sleeved on the outside of the welding shaft core 5023 via bearings and can rotate along the central axis of the welding shaft core 5023. The welding wheel 5021 is sleeved on the outside of the welding wheel seat 5025 and fixed to the welding wheel seat 5025. The inside of the welding wheel seat 5025 is located inside the composite current collector roller 5022. An electrode lug seat 5026 is provided on the outside of the welding wheel 5021. The outer diameter of the electrode lug seat 5026 is the same as the outer diameter of the welding wheel 5021. The electrode lug seat 5026 serves to assist in supporting the A-side foil 100, the B-side foil 300, and the composite current collector 200. The electrode lug seat 5026, the welding wheel 5021, and the welding wheel seat 5025 are fixed together with screws. Therefore, when the welding wheel 5021 needs to be replaced, simply unscrew the screws on the tab seat 5026 to remove the welding wheel 5021 and replace it with a new one. Specifically, the tab seat 5026 has multiple first screw holes circumferentially, the welding wheel 5021 has multiple second screw holes corresponding to the first screw holes circumferentially, and the inner circumferential side of the welding wheel seat 5025 has multiple third screw holes corresponding to the first screw holes. Screws passing through the corresponding first, second, and third screw holes can secure the tab seat 5026, the welding wheel 5021, and the welding wheel seat 5025 together.

[0096] Furthermore, the composite current collector roller 5022 is sleeved on the outer circular step 50231 through a bearing, so that the composite current collector roller 5022 can rotate along the central axis of the outer circular step 50231, and at least two outer circular steps 50231 are provided on the welding shaft core 5023 to ensure the stability of the rotation of the welding shaft core 5023.

[0097] Please see Figure 9 , Figure 11 Furthermore, at least one end of the welding shaft 5023 passes through the corresponding shaft locking seat 5024, and the part that passes through is provided with an adjustment groove 50232 that cooperates with the eccentric adjustment tool to rotate the welding shaft 5023. After the shaft locking seat 5024 releases the welding shaft 5023, the eccentric adjustment tool is inserted into the adjustment groove 50232, and the welding shaft 5023 can be easily rotated.

[0098] Please see Figure 9Furthermore, the shaft locking seat 5024 includes an upper locking block 50241 and a lower fixed base 50242. The joint between the upper locking block 50241 and the lower fixed base 50242 is provided with locking holes that mate with both ends of the welded shaft 5023. The upper locking block 50241 is connected to the lower fixed base 50242 by screws and locks the welded shaft 5023 within the locking holes. Loosening the screws releases the welded shaft 5023, allowing it to rotate. Specifically, the upper locking block 50241 has a fourth screw hole at each of its four corners, and the lower fixed base 50242 has a fifth screw hole at each of its four top corners that mates with the corresponding fourth screw hole. Screws passing through the corresponding fourth and fifth screw holes secure the upper locking block 50241 and the lower fixed base 50242 together.

[0099] Please see Figure 9 , Figure 10 , Figure 14 Furthermore, a load-bearing wheel assembly 5027 is provided below the welding wheel 5021. The load-bearing wheel assembly 5027 serves to support the welding wheel 5021 during the welding process. Since ultrasonic welding requires a certain amount of pressure, if the welding wheel 5021 is not supported, the welding shaft 5023 is prone to bending during welding, affecting welding quality and requiring frequent replacement of the welding shaft 5023. Specifically, the load-bearing wheel assembly 5027 includes a load-bearing base 50271 and two load-bearing wheels 50272 rotatably mounted on the load-bearing base 50271. The wheel surfaces of the two load-bearing wheels 50272 contact the two sides of the lower wheel surface of the welding wheel 5021, supporting the welding wheel 5021 without affecting the normal rotation of the load-bearing wheels 50272. Meanwhile, the wheel width of the load-bearing roller 50272 is the same as that of the welding roller 5021, which can prevent the load-bearing roller 50272 from affecting the adjacent composite current collector roller 5022.

[0100] Please see Figure 1 Since the automatic welding machine for current collector tabs has many components and many intersection points, adjusting the orientation of the A-side foil 100, composite current collector 200, B-side foil 300, and double-sided foil-filled composite current collector 400 can make the layout of each component more compact and reduce the overall volume of the automatic welding machine for current collector tabs as much as possible. For this purpose, the automatic welding machine for current collector tabs in this embodiment is equipped with multiple directional rollers 18. By adjusting the orientation of the A-side foil 100, composite current collector 200, B-side foil 300, and double-sided foil-filled composite current collector 400 through the directional rollers 18, the installation space of the equipment is saved and the equipment structure is optimized.

[0101] It should be understood that since the A-side foil unwinding mechanism 1, the composite current collector unwinding mechanism 2, the B-side foil unwinding mechanism 3, the active traction mechanism 6, the winding mechanism 7, the first tension control mechanism 9, the second tension control mechanism 10, the third tension control mechanism 11, the fourth tension control mechanism 12, the fifth tension control mechanism 13, the first unwinding correction sensor 14, the second unwinding correction sensor 15, the third unwinding correction sensor 16, and the winding correction sensor 17 are all existing mature technologies, the present invention will not elaborate on their specific structures and working principles.

[0102] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0103] The present invention has been described above with reference to the accompanying drawings. Obviously, the implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other situations without modification, are all within the protection scope of the present invention.

Claims

1. An automatic welding system for multi-layer electrode tabs, characterized in that, The system includes an A-side foil unwinding mechanism, a composite current collector unwinding mechanism, a B-side foil unwinding mechanism, a roll assembly mechanism, an ultrasonic rolling welding mechanism, a weld stamp flattening mechanism, an active traction mechanism, and a winding mechanism. The A-side foil output from the A-side foil unwinding mechanism, the composite current collector output from the composite current collector unwinding mechanism, and the B-side foil output from the B-side foil unwinding mechanism are aligned and assembled at the roll assembly mechanism. Then, the ultrasonic rolling welding mechanism performs double-sided rolling welding, welding the A-side foil and the B-side foil to the tab ends A and B of the composite current collector, respectively, forming a double-sided foil-replenishing composite current collector. The weld stamp flattening mechanism flattens the weld stamp on the double-sided foil-replenishing composite current collector. The active traction mechanism provides power for the movement of the double-sided foil-replenishing composite current collector. The winding mechanism winds up the double-sided foil-replenishing composite current collector. The ultrasonic rolling welding mechanism includes an upper rolling welding assembly and a lower bearing welding assembly. The A-side foil, the composite current collector, and the B-side foil pass between the upper rolling welding assembly and the lower bearing welding assembly, and the wrap angle of the A-side foil, the composite current collector, and the B-side foil passing through the lower bearing welding assembly is 0-180°. The upper roller welding assembly includes a welding wheel, an ultrasonic generator, and a welding wheel motor. The vibration output end of the ultrasonic generator is connected to one side of the rotating shaft of the welding wheel, and the output shaft of the welding wheel motor is connected to the other side of the rotating shaft of the welding wheel and drives the welding wheel to rotate. The lower welding assembly includes a welding roller and a composite current collector roller arranged side by side. The welding roller is located directly below the welding roller. The welding portions of the A-side foil, the composite current collector, and the B-side foil pass between the welding roller and the welding roller. The main body of the composite current collector passes through the composite current collector roller. The height difference between the highest point of the welding roller and the highest point of the composite current collector roller is equal to half the thickness of the main body of the composite current collector minus the thickness of the B-side foil. The lower welding assembly further includes a welding shaft core and shaft core locking seats disposed at both ends of the welding shaft core. The welding wheel is sleeved on the welding shaft core and can rotate along the central axis of the welding shaft core. An eccentric outer circular step is provided on the welding shaft core. The central axis of the outer circular step is not coaxial with the central axis of the welding shaft core. The composite current collector roller is sleeved on the outer circular step and can rotate along the central axis of the outer circular step. The distance between the central axis of the outer circular step and the central axis of the welding core is 0.3-1mm; At least one end of the welding shaft passes through the corresponding shaft locking seat, and the part that passes through is provided with an adjustment groove that cooperates with the eccentric adjustment tool to rotate the welding shaft. A welding wheel seat is provided at the connection between the welding wheel and the welding shaft. The welding wheel seat is sleeved on the outside of the welding shaft and can rotate along the central axis of the welding shaft. The welding wheel is sleeved on the outside of the welding wheel seat and fixed to the welding wheel seat. The inside of the welding wheel seat is located inside the composite current collector roller. An electrode lug seat is provided on the outside of the welding wheel. The electrode lug seat, the welding wheel, and the welding wheel seat are fixed together by screws, and the outer diameter of the electrode lug seat is the same as the outer diameter of the welding wheel.

2. The automatic welding system for multi-layer electrode tabs according to claim 1, characterized in that, The multi-layer electrode tab automatic welding system further includes a first tension control mechanism for controlling the tension of the A-side foil, a second tension control mechanism for controlling the tension of the composite current collector, and a third tension control mechanism for controlling the tension of the B-side foil. The first tension control mechanism is disposed between the A-side foil unwinding mechanism and the roll-to-roll assembly mechanism, the second tension control mechanism is disposed between the composite current collector unwinding mechanism and the roll-to-roll assembly mechanism, and the third tension control mechanism is disposed between the B-side foil unwinding mechanism and the roll-to-roll assembly mechanism.

3. The automatic welding system for multi-layer electrode tabs according to claim 1, characterized in that, The welding stamp flattening mechanism includes an upper pressure roller, a lower pressure roller, a pressure roller drive motor, and a flattening cylinder. The double-sided foil-repair composite current collector passes between the upper and lower pressure rollers. The drive shaft of the pressure roller drive motor is connected to the rotating shaft of the upper pressure roller and drives the upper pressure roller to rotate. The linear velocity of the upper pressure roller is the same as the linear velocity of the active traction mechanism. The telescopic end of the flattening cylinder is connected to one side of the upper pressure roller and drives the upper pressure roller to press against the lower pressure roller, flattening the welding stamp on the double-sided foil-repair composite current collector.

4. The automatic welding system for multi-layer electrode tabs according to claim 3, characterized in that, The welding stamping flattening mechanism also includes a pressure roller fixed side plate and a pressure roller adjusting side plate. The pressure roller adjusting side plate is located on the front side of the pressure roller fixed side plate and can slide left and right along the length direction of the pressure roller fixed side plate. The pressure roller drive motor is located on the front side of the pressure roller adjusting side plate through a motor mounting plate and can slide up and down along the height direction of the pressure roller adjusting side plate. The flattening cylinder is connected to the pressure roller adjusting side plate through a cylinder locking block.

5. The automatic welding system for multi-layer electrode tabs according to claim 1, characterized in that, The multi-layer electrode tab automatic welding system further includes a fourth tension control mechanism for controlling the tension of the two-sided foil composite current collector before the solder stamp is flattened, and a fifth tension control mechanism for controlling the tension of the two-sided foil composite current collector after the solder stamp is flattened. The fourth tension control mechanism is located between the ultrasonic rolling welding mechanism and the solder stamp flattening mechanism, and the fifth tension control mechanism is located between the active traction mechanism and the winding mechanism.

6. The automatic welding system for multi-layer electrode tabs according to claim 1, characterized in that, The multi-layer electrode tab automatic welding system further includes a first unwinding correction sensor for detecting whether the unwinding position of the A-side foil is offset, a second unwinding correction sensor for detecting whether the unwinding position of the composite current collector is offset, and a third unwinding correction sensor for detecting whether the unwinding position of the B-side foil is offset. The first unwinding correction sensor is disposed between the A-side foil unwinding mechanism and the roll assembly mechanism, the second unwinding correction sensor is disposed between the composite current collector unwinding mechanism and the roll assembly mechanism, and the third unwinding correction sensor is disposed between the B-side foil unwinding mechanism and the roll assembly mechanism. The A-side foil unwinding mechanism is provided with a first unwinding correction mechanism for correcting the unwinding position of the A-side foil, the composite current collector unwinding mechanism is provided with a second unwinding correction mechanism for correcting the unwinding position of the composite current collector, and the B-side foil unwinding mechanism is provided with a third unwinding correction mechanism for correcting the unwinding position of the B-side foil.

7. The automatic welding system for multi-layer electrode tabs according to claim 1, characterized in that, The multi-layer electrode tab automatic welding system also includes a winding correction sensor for detecting whether the winding position of the two-sided foil composite current collector is offset. The winding correction sensor is disposed between the active traction mechanism and the winding mechanism. The winding mechanism is provided with a winding correction mechanism for correcting the winding position of the two-sided foil composite current collector.

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