A battery piece string welding system and string welding process

Abstract

The application discloses a battery piece string welding system, which comprises a battery piece feeding mechanism, a battery piece carrying mechanism, an assembling and welding mechanism, a welding strip unwinding mechanism, a welding strip shaping and placing mechanism and a welding lamp box mechanism; the battery piece feeding mechanism is used for storing and transporting the battery pieces; the battery piece carrying mechanism is used for carrying the battery pieces in the battery piece feeding mechanism to the battery piece assembling and welding mechanism; the welding strip unwinding mechanism is used for transporting the welding strip raw material to the welding strip shaping and placing mechanism; the welding strip shaping and placing mechanism is used for processing the welding strip raw material into the required shape and length, and placing the processed welding strip on the assembling and welding mechanism; the assembling and welding mechanism is used for assembling the processed welding strip and the battery pieces; and the welding lamp box mechanism is used for welding the assembled welding strip and the battery pieces. The application provides a battery piece string welding system and a string welding process, which can weld the battery string with any length at one time, and the welding production efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to a battery piece string welding system and a string welding process. BACKGROUND

[0002] At present, with the wide application of photovoltaic modules, the development of non-standard equipment for modules, traditional stable module production and manufacturing are realized. Due to the structural characteristics of the traditional battery piece screen plate, a plurality of traditional battery pieces and a plurality of welding strips are welded into a battery string, and then the battery string and other components are assembled into one.

[0003] The production mode of the traditional string welding equipment is to first pull and lay a plurality of short welding strips on the welding conveying platform, then place a battery piece on the laid welding strips for the first time, the grid lines on the back of the placed battery piece are one-to-one corresponding to the plurality of welding strips and are ensured not to be offset, then a plurality of long welding strips are pulled and laid on the front of the battery piece for the second time, and each welding strip is ensured to completely coincide with the grid line on the battery piece, then a second battery piece is placed on the welding platform, the back of the second placed battery piece presses the welding strip, a space of about 2mm is left between the two battery pieces, and the grid line on the back of the battery piece completely coincides with each corresponding welding strip, then a plurality of welding strips are laid on the front of the second battery piece, and the above actions are repeated 12 times, and finally a plurality of short welding strips are pulled and laid on the front of the last battery piece, and each welding strip is ensured to completely coincide with each grid line on the front of the battery piece. When the battery piece with the laid welding strip is conveyed to the position below the welding lamp by the conveying belt or the moving fork, the infrared lamp is heated to make the welding strip and the grid line on the front and back of the battery piece hot melt connected. Single piece welding needs 12 times of welding, and 2-piece welding also needs 6 times to complete the production of a battery string.

[0004] Using the above traditional production mode, the welding production efficiency is very low, and the production rhythm is slow.

[0005] Since each traditional battery piece is provided with a plurality of (9-12) welding strips, the light exposure area of the battery piece is greatly reduced, thereby reducing the effective power generation area. Moreover, there is a space of about 2mm between the traditional battery pieces in the battery string, which also reduces the light exposure area or power generation area. The above two reasons result in low power generation efficiency of the traditional battery piece.

[0006] The MBB technology used in the above technology is mainly to weld 9-12 round welding strips with a diameter of about 300μm with the grid lines. However, using this welding mode, the battery piece has more grid lines, the welding strip has a smaller diameter, and there are too many connection points between the battery piece and the welding strip, which results in low light utilization rate of the battery piece. Moreover, the welding strip will still be cracked during the load and temperature cycle test due to thermal expansion, and the welding strip laying and welding mode is difficult to implement in actual production and has a low welding yield. SUMMARY

[0007] The technical problem solved by the present application is to overcome the shortcomings of the prior art and provide a battery piece string welding system and a string welding process, which can weld a battery string of any length at one time and has high welding production efficiency.

[0008] To solve the above technical problems, the technical scheme of the present application is:

[0009] A battery piece string welding system, which comprises a battery piece feeding mechanism, a battery piece carrying mechanism, an assembling and welding mechanism, a welding strip unwinding mechanism, a welding strip shaping and placing mechanism, and a welding lamp box mechanism.

[0010] The battery piece feeding mechanism is used for storing and transporting the battery pieces.

[0011] The battery piece carrying mechanism is used for carrying the battery pieces in the battery piece feeding mechanism to the battery piece assembling and welding mechanism.

[0012] The welding strip unwinding mechanism is used for transporting the welding strip raw material to the welding strip shaping and placing mechanism.

[0013] The welding strip shaping and placing mechanism is used for processing the welding strip raw material into the required shape and length, and placing the processed welding strip on the assembling and welding mechanism.

[0014] The assembling and welding mechanism is used for assembling the processed welding strip and the battery pieces.

[0015] The welding lamp box mechanism is used for welding the assembled welding strip and battery pieces.

[0016] Further, the battery piece feeding mechanism comprises a feeding plate, a feeding box, a feeding slide rail, and a feeding jacking mechanism, the bottom of the feeding plate is slidably connected with the feeding slide rail through a feeding slide block, a plurality of feeding boxes are fixed on the feeding plate, the bottom of each feeding box and the feeding plate are both provided with through holes for the feeding jacking mechanism to pass through, and the feeding jacking mechanism is used for jacking the battery pieces in the feeding box.

[0017] Further, the battery piece feeding mechanism further comprises a calibration platform, the calibration platform comprises a positioning installation plate, the positioning installation plate is provided with a supporting shaft and a cylinder installation plate, the supporting shaft is provided with a positioning upper plate, a group of adjacent edges of the positioning upper plate are both provided with positioning grooves, the cylinder installation plate is provided with a sliding table cylinder, the sliding block of the sliding table cylinder is provided with a positioning shaft installation plate, the positioning shaft installation plate is provided with a positioning shaft matched with the positioning grooves of the positioning upper plate, another group of adjacent edges of the positioning upper plate are both provided with positioning blocks, and two positioning blocks are vertically arranged.

[0018] Further, the battery piece conveying mechanism comprises an electric cylinder mounting plate and square tube supports arranged on both sides of the battery piece feeding mechanism, a first sliding rail is arranged on the square tube support on one side of the battery piece feeding mechanism, a first electric cylinder is arranged on the square tube support on the other side of the battery piece feeding mechanism, one end of the electric cylinder mounting plate is in sliding connection with the first sliding rail, the other end of the electric cylinder mounting plate is connected with the electric cylinder sliding block of the first electric cylinder, the first electric cylinder drives the electric cylinder mounting plate to move, a second electric cylinder is arranged on the electric cylinder mounting plate, and a vacuum suction nozzle for sucking the battery piece is arranged on the piston rod of the second electric cylinder.

[0019] Further, two groups of the solder strip unwinding mechanisms are respectively arranged on both sides of the assembling and welding mechanism, the solder strip unwinding mechanism comprises an unwinding support, a plurality of load rollers are sequentially arranged on the feeding side of the unwinding support from top to bottom, a first guide wheel, a second guide wheel and a third guide wheel are sequentially arranged between the feeding side and the discharging side of the unwinding support, a lifting wheel and a lifting support are arranged below the second guide wheel, the lifting wheel is fixed on a lifting sliding block, a sliding rod for the lifting sliding block to slide up and down is arranged in the lifting support, a discharging support is arranged on the discharging side of the unwinding support, a fourth guide wheel and a fifth guide wheel are arranged on the discharging support, and the fourth guide wheel is located below the fifth guide wheel.

[0020] Further, two groups of the solder strip shaping and placing mechanisms are respectively arranged on both sides of the assembling and welding mechanism, the solder strip shaping and placing mechanism comprises a solder strip grabbing assembly and a solder strip cutting and shaping assembly.

[0021] The solder strip grabbing assembly comprises a grabbing support, a grabbing driving assembly, a grabbing sliding plate and a clamping jaw assembly, the grabbing driving assembly is fixed on the grabbing support, the grabbing driving assembly drives the grabbing sliding plate to move, the clamping jaw assembly is arranged on the grabbing sliding plate, and the clamping jaw assembly is used for grabbing the solder strip raw material on the solder strip unwinding mechanism into the solder strip cutting and shaping assembly.

[0022] The solder strip cutting and shaping assembly comprises a shaping support, a shaping moving assembly, an upper punch and a lower punch, the shaping moving assembly is arranged on the shaping support, the shaping moving assembly drives the upper punch to move up and down, and the lower punch and the upper punch stamp and shape the solder strip raw material.

[0023] Further, the grabbing driving assembly comprises a grabbing motor, a driving wheel, a belt and a driven wheel, the grabbing motor is fixed on one end of the grabbing support, the driving wheel is fixed on the grabbing motor, the driven wheel is rotatably connected with the other end of the grabbing support, the driving wheel and the driven wheel are in transmission connection through the belt, and the grabbing sliding plate is fixed on the belt.

[0024] The clamping jaw assembly comprises a movable jaw, a fixed jaw, a telescopic cylinder and a connecting rod fixed on the piston rod of the telescopic cylinder, the telescopic cylinder is fixed on the clamping slide plate, one end of the movable jaw is hinged to the connecting rod, the other end of the movable jaw is hinged to the fixed jaw, and the fixed jaw is fixed on the side wall of the clamping slide plate;

[0025] The shaping moving assembly comprises a moving plate, a moving motor, a lead screw, a nut, a moving sliding block and a moving sliding rail, the moving sliding block is fixed on the shaping support, the moving sliding rail is fixed on the side wall of the moving plate, the moving sliding block is matched with the moving sliding rail to slide, the moving motor is fixed on the top of the moving plate, the lead screw is fixed on the motor shaft of the moving motor, the nut is fixed on the side wall of the moving plate, and the moving motor drives the nut to move up and down;

[0026] The upper punch comprises a third electric cylinder, a third sliding rail, a punching plate and a punching head, the third electric cylinder and the third sliding rail are horizontally arranged on the other side wall of the moving plate respectively, the punching plate is fixed on the cylinder sliding block of the third electric cylinder, the third electric cylinder drives the punching plate to move horizontally on the third sliding rail, the punching head is fixed on the end of the punching plate, the bottom of the punching head is provided with a pressing block, the bottom of the pressing block is provided with an upper punching surface for punching the welding strip raw material, a suction hole is arranged on the upper punching surface, and a suction port is arranged on the pressing block and communicated with the suction hole;

[0027] The lower punch comprises a lower mold cylinder and a lower mold base, the lower mold base is fixed on the piston rod of the lower mold cylinder, the lower mold base is provided with a punching groove, the bottom surface of the punching groove is provided with a lower punching surface for punching the welding strip raw material, and the end of the punching groove is provided with a cutting step for cutting the welding strip raw material.

[0028] Further, the welding lamp box mechanism comprises lamp box supports, a fourth electric cylinder, a fourth mounting plate and a lamp box, two lamp box supports are located at two ends of the lamp box respectively, the lamp box supports are provided with fourth sliding rails, the two ends of the lamp box are provided with fourth sliding blocks matched with the fourth sliding rails to slide, the fourth mounting plate is fixed on the lamp box supports, the fourth electric cylinder is fixed on the fourth mounting plate, and the fourth electric cylinder drives the lamp box to move up and down.

[0029] Further, the assembling and welding mechanism comprises a transmission assembly, a guide rail assembly and a plurality of platform assemblies which can move on the guide rail assembly, the transmission assembly drives the guide rail assembly to move, the two ends of the guide rail assembly are respectively provided with driving assemblies for pushing the platform assemblies to move, and the platform assemblies are used for placing and assembling and welding the battery pieces;

[0030] The guide rail assembly comprises two parallel guide rails;

[0031] The platform assembly includes a hot plate, a mounting plate, a lifting assembly, a movable assembly, and a base plate. The bottom ends of the base plate are respectively provided with sliders for sliding on guide rails. The hot plate is mounted on the mounting plate. The movable assembly is mounted on the top of the base plate. The lifting assembly is fixedly connected to the base plate. One end of the mounting plate is fixed to the movable assembly. The lifting assembly is used to drive the other end of the mounting plate to lift upward.

[0032] A stringing process for a battery cell stringing system includes the following steps:

[0033] Step S1: The battery cell feeding mechanism performs a feeding operation on the battery cells;

[0034] The battery cells are placed in the feeding box of the battery cell feeding mechanism, the feeding box is pushed to the feeding station, and the battery cells are placed on the calibration platform of the battery cell feeding mechanism by the battery cell transport mechanism to calibrate and position the battery cells.

[0035] After calibration, the battery cells are transported to the assembly and welding mechanism via the battery cell transport mechanism. The assembly and welding mechanism adsorbs and fixes the battery cells, waiting to be assembled with the welding strips.

[0036] The battery cell handling mechanism returns to the loading station;

[0037] Step S2: The welding strip raw material is processed and shaped by the welding strip unwinding mechanism and the welding strip shaping and placement mechanism;

[0038] The welding strip gripping component of the welding strip shaping and placement mechanism grips the welding strip material in the welding strip unwinding mechanism and places it evenly in the lower die of the welding strip shaping and placement mechanism. The upper die of the welding strip shaping and placement mechanism then punches and cuts the welding strip material in the lower die into the required shape and length.

[0039] The upper stamping die of the welding strip shaping and placement mechanism absorbs and transports the shaped welding strip to the main grid line of the battery cell, completely overlapping and covering the edge of the welding strip with the main grid line.

[0040] Step S3: The battery cells and welding strips are welded into battery strings by the assembly and welding mechanism and the welding light box mechanism;

[0041] The assembly and welding mechanism splices and connects several battery cells and welding strips together in series. Then, the assembly and welding mechanism sets the heating temperature and moves the assembled battery string to the welding station.

[0042] The height of the welding light box mechanism is lowered to the welding station, and the pressure pin of the light box is pressed down onto the welding strip. The light tube of the light box heats and welds for 1 to 2 seconds, and the battery cells are connected in series to form a battery string through the welding strip.

[0043] Adopting the technical scheme, firstly, the battery piece feeding mechanism is used to feed the battery piece, then the battery piece carrying mechanism is used to automatically carry the battery piece to the calibration platform, the calibration platform is used to mechanically calibrate the placing position of the battery piece, after calibration, the battery piece carrying mechanism is used to carry the battery piece to the assembling and welding mechanism, the assembling and welding mechanism is used to assemble the battery piece and the welding band shaped and cut by the welding band shaping and placing mechanism into a battery string, and the welding band and the battery piece after assembling are welded by cooperating with the welding lamp box mechanism. The application can weld the battery string with any length at one time, effectively reduces the distance between the battery pieces in the battery string, reduces the use of the main grid line silver paste of the battery piece, reduces the amount of the front and back welding band and the light refraction area. The welding band series area between the battery pieces is increased, the reliability is high. The use of the MBB assembly welding band and the laminated conductive adhesive is reduced, the power and cost consumption are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is a front view of a battery piece string welding system of the application;

[0045] Figure 2 It is a front view of a battery piece carrying mechanism of the application;

[0046] Figure 3 It is a front view of a battery piece feeding mechanism of the application;

[0047] Figure 4 It is a top view of Figure 3 ;

[0048] Figure 5 It is a front view of a calibration platform of the application;

[0049] Figure 6 It is a partial detail view of the calibration platform of the application;

[0050] Figure 7 It is a front view of a welding band unwinding mechanism of the application;

[0051] Figure 8 It is a front view of a welding band shaping and placing mechanism of the application;

[0052] Figure 9 It is a rear view of the welding band shaping and placing mechanism of the application;

[0053] Figure 10 It is a structure schematic view of a clamping jaw assembly of the application;

[0054] Figure 11 It is a structure schematic view of a punching head of the application;

[0055] Figure 12 It is a front view of a lower die seat of the application;

[0056] Figure 13 is a front view of the welding lamp box mechanism of the present application;

[0057] Figure 14 is a structural schematic view of the lamp box of the present application;

[0058] Figure 15 is a front view of the transmission assembly of the assembling and welding mechanism of the present application;

[0059] Figure 16 is a front view of the platform assembly of the present application;

[0060] Figure 17 is an enlarged view of a part of the platform assembly of the present application;

[0061] Figure 18 is a front view of the adapter plate of the present application;

[0062] Figure 19 is a front view of the movable assembly of the present application;

[0063] Figure 20 is a side view of the platform assembly of the present application;

[0064] Figure 21 is an assembling schematic view of the assembling and welding mechanism of the present application;

[0065] Figure 22 is a front view of the present application; Figure 21

[0066] Figure 23 is a structural schematic view of the welding strip after shaping of the present application;

[0067] Figure 24 is a structural schematic view of the battery string unloading mechanism of the present application;

[0068] Figure 25 is a structural schematic view of the unloading driving assembly of the present application. DETAILED DESCRIPTION

[0069] In order to make the content of the present application more easily understood, the present application is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings.

[0070] Embodiment One

[0071] As shown in the drawings, the present embodiment provides a battery piece string welding system, which comprises a battery piece loading mechanism 1, a battery piece carrying mechanism 2, an assembling and welding mechanism 3, a welding strip unwinding mechanism 4, a welding strip shaping and placing mechanism 5 and a welding lamp box mechanism 6; Figures 1 to 23 The battery piece loading mechanism 1 is used for storing and transporting the loading of the battery piece 200;

[0072] The battery piece loading mechanism 1 is used for storing and transporting the loading of the battery piece 200;​

[0073] The battery piece conveying mechanism 2 is used to convey the battery piece 200 in the battery piece feeding mechanism 1 to the battery piece assembling and welding mechanism 3;

[0074] The welding strip unwinding mechanism 4 is used to transport the welding strip raw material 300 to the welding strip shaping and placing mechanism 5;

[0075] The welding strip shaping and placing mechanism 5 is used to process the welding strip raw material 300 into a required shape and length, and place the processed welding strip 400 on the assembling and welding mechanism 3;

[0076] The assembling and welding mechanism 3 is used to assemble the processed welding strip 400 and the battery piece 200;

[0077] The welding lamp box mechanism 6 is used to weld the assembled welding strip 400 and the battery piece 200.

[0078] As shown in Figure 3 , 4 The battery piece feeding mechanism 1 of the embodiment includes a feeding plate 11, a feeding box 12, a feeding slide rail 13 and a feeding jacking mechanism 15. The bottom of the feeding plate 11 is slidably connected with the feeding slide rail 13 through a feeding slide block 14. The feeding plate 11 can be manually moved during feeding, or a driving assembly such as an electric cylinder, a screw and a nut pair can be added. A plurality of feeding boxes 12 are fixed on the feeding plate 11, and the battery pieces 200 are stacked in the feeding boxes 12. The bottom of each feeding box 12 and the feeding plate 11 are both provided with through holes for the feeding jacking mechanism 15 to pass through. When the battery piece conveying mechanism 2 sucks the battery pieces 200 in the feeding boxes 12, the feeding jacking mechanism 15 is used to jack up the battery pieces 200 in the feeding boxes 12, so that the stacked battery pieces 200 are jacked up, and the battery piece conveying mechanism 2 can more easily suck the battery pieces 200. The feeding jacking mechanism 15 includes a jacking electric cylinder and a top plate 16 fixed on the driving rod of the jacking electric cylinder. The jacking electric cylinder drives the top plate 16 to pass through the through holes in the feeding boxes 12 and the feeding plate 11 to jack up the battery pieces 200.

[0079] As shown in Figure 2As shown, the battery piece conveying mechanism 2 of the embodiment includes a cylinder mounting plate 23 and square tube supports arranged on both sides of the battery piece feeding mechanism 1. The square tube support on one side of the battery piece feeding mechanism 1 is provided with a first sliding rail 21, and the square tube support on the other side of the battery piece feeding mechanism 1 is provided with a first cylinder 22. One end of the cylinder mounting plate 23 is in sliding connection with the first sliding rail 21, and the other end of the cylinder mounting plate 23 is connected with a cylinder sliding block of the first cylinder 22. The first cylinder 22 drives the cylinder mounting plate 23 to move. The cylinder mounting plate 23 is provided with a second cylinder 24. A vacuum suction nozzle 25 for sucking the battery piece is arranged on a driving rod of the second cylinder 24. The vacuum suction nozzle 25 is fixed on a suction nozzle mounting plate. The suction nozzle mounting plate is connected with a movable plate. The movable plate is fixed on the driving rod of the second cylinder 24. The movable plate is fixed with a guide column in sliding connection with the cylinder mounting plate 23. The first cylinder 22 drives the vacuum suction nozzle 25 to move horizontally to above the feeding box 12. The second cylinder 24 drives the vacuum suction nozzle 25 to move downward. The battery piece 200 in the feeding box 12 is sucked by the vacuum suction nozzle 25. The second cylinder 24 drives the vacuum suction nozzle 25 to move upward to suck the battery piece 200 out of the feeding box 12. Then the first cylinder 22 drives the vacuum suction nozzle 25 to place the battery piece 200 on the calibration platform 7.

[0080] As shown in Figure 5 , 6 As shown, the battery piece feeding mechanism 1 of the embodiment further includes a calibration platform 7. The calibration platform 7 includes a positioning mounting plate 71. The positioning mounting plate 71 is provided with a support shaft 72 and a cylinder mounting plate 73. The support shaft 72 is provided with a positioning upper plate 74. A group of adjacent edges of the positioning upper plate 74 are each provided with a positioning groove 741. The cylinder mounting plate 73 is provided with a sliding table cylinder 75. A positioning shaft mounting plate is arranged on a sliding block of the sliding table cylinder 75. The positioning shaft mounting plate is provided with a positioning shaft 76 matched with the positioning groove 741 of the positioning upper plate 74. Another group of adjacent edges of the positioning upper plate 74 are each provided with a positioning block 77. The two positioning blocks 77 are arranged vertically. After the battery piece is placed on the calibration platform 7, the two sliding table cylinders 75 are actuated to drive the respective positioning shafts 76 to move. The positioning shafts 76 push a corner of the battery piece 200 into a right angle edge formed by the two positioning blocks 77 to focus and calibrate the battery piece 200. The placement position of the battery piece 200 when entering the assembling and welding mechanism 3 does not appear to be offset error, which ensures the precision of the battery piece 200 and the welding strip 400 when assembling.

[0081] As shown in Figure 7As shown, the two groups of welding strip unwinding mechanisms 4 of the embodiment are respectively located on the two sides of the assembling and welding mechanism 3, the welding strip unwinding mechanism 4 comprises an unwinding support, the feeding side of the unwinding support of the embodiment is sequentially provided with 6 groups of load rollers 40 from top to bottom, and the welding strip raw material 300 is wound on the load rollers 40. The first guide wheel 41, the second guide wheel 42 and the third guide wheel 43 are sequentially arranged between the feeding side and the discharging side of the unwinding support, the lifting wheel 46 and the lifting support are arranged below the second guide wheel 42, the lifting wheel 46 is fixed on the lifting sliding block 47, the lifting support is provided with the sliding rod 48 for the up-down sliding of the lifting sliding block 47, the discharging side of the unwinding support is provided with a discharging support, the fourth guide wheel 44 and the fifth guide wheel 45 are arranged on the discharging support, and the fourth guide wheel 44 is located below the fifth guide wheel 45. The welding strip raw material 300 is discharged from the fifth guide wheel 45 after sequentially passing through the first guide wheel 41, the second guide wheel 42, the lifting wheel 46, the third guide wheel 43 and the fourth guide wheel 44, and the cooperation of each guide wheel and the lifting wheel 46 makes the welding strip raw material 300 have good guiding force in the transportation process, so that the welding strip raw material 300 is more smooth and flat during transportation.

[0082] As shown, Figures 8 to 12 The two groups of welding strip shaping and placing mechanisms 5 of the embodiment are respectively located on the two sides of the assembling and welding mechanism 3, the welding strip shaping and placing mechanism 5 comprises a welding strip grabbing assembly and a welding strip cutting and shaping assembly;

[0083] The welding strip grabbing assembly comprises a grabbing support 51, a grabbing driving assembly, a grabbing sliding plate 52 and a clamping jaw assembly, the grabbing driving assembly is fixed on the grabbing support 51, the grabbing driving assembly drives the grabbing sliding plate 52 to move, the clamping jaw assembly is arranged on the grabbing sliding plate 52, and the clamping jaw assembly is used for grabbing the welding strip raw material 300 on the welding strip unwinding mechanism 4 into the welding strip cutting and shaping assembly;

[0084] The welding strip cutting and shaping assembly comprises a shaping support 53, a shaping moving assembly, a stamping upper die and a stamping lower die, the shaping moving assembly is arranged on the shaping support 53, the shaping moving assembly drives the stamping upper die to move up and down, and the stamping lower die and the stamping upper die stamp the welding strip raw material 300;

[0085] When the welding strip raw material 300 is grabbed, the stamping upper die moves upward, the stamping lower die moves downward, at this time, the grabbing driving assembly drives the clamping jaw assembly to pass between the stamping upper die and the stamping lower die to reach the fifth guide wheel 45, the clamping jaw assembly grabs the welding strip raw material 300 back, then the stamping upper die moves downward, the stamping lower die moves upward, and the welding strip raw material 300 is stamped and shaped.

[0086] As shown, Figure 8As shown, the gripping drive assembly of this embodiment includes a gripping motor, a drive wheel 541, a belt 542, and a driven wheel. The gripping motor is fixed to one end of the gripping bracket 51, the drive wheel 541 is fixed to the gripping motor, and the driven wheel is rotatably connected to the other end of the gripping bracket 51 through a bearing. The drive wheel 541 and the driven wheel are connected by a belt 542. The gripping slide plate 52 is fixed to the belt 542. The gripping motor drives the drive wheel 541 to rotate, and the drive wheel 541 and the driven wheel drive the belt 542 to rotate. The belt 542 then drives the gripping slide plate 52 to move.

[0087] like Figure 10 As shown, the gripper assembly of this embodiment includes a movable gripper 551, a fixed gripper 552, a telescopic cylinder 553, and a connecting rod 554 fixed to the piston rod of the telescopic cylinder 553. The telescopic cylinder 553 is fixed to the gripping slide plate 52. One end of the movable gripper 551 is hinged to the connecting rod 554, and the other end of the movable gripper 551 is hinged to the fixed gripper 552. The fixed gripper 552 is fixed to the side wall of the gripping slide plate 52. When the telescopic cylinder 553 retracts, it causes the movable gripper 551 to open; when the telescopic cylinder 553 extends, it causes the movable gripper 551 to close, thereby realizing the opening and closing of the gripper assembly.

[0088] like Figure 9 As shown, the shaping and moving assembly in this embodiment includes a moving plate 561, a moving motor 562, a lead screw, a nut 563, a moving slider 564, and a moving slide rail 565. The moving slider 564 is fixed on the shaping bracket 53, and the moving slide rail 565 is fixed on the side wall of the moving plate 561. The moving slider 564 and the moving slide rail 565 slide together. The moving motor 562 is fixed on the top of the moving plate 561, the lead screw is fixed on the motor shaft of the moving motor 562, and the nut 563 is fixed on the side wall of the moving plate 561. The moving motor 562 drives the nut 563 to move up and down, and the nut 563 then drives the moving plate 561 to move up and down, thereby realizing the up and down movement of the stamping upper die.

[0089] like Figures 8 to 11As shown, the stamping upper die of the embodiment includes a third electric cylinder 571, a third sliding rail 572, a stamping plate 573 and a stamping head 574. The third electric cylinder 571 and the third sliding rail 572 are respectively arranged horizontally on the other side wall of the moving plate 561. The stamping plate 573 is fixed on the electric cylinder slide block of the third electric cylinder 571, and the third electric cylinder 571 drives the stamping plate 573 to move horizontally on the third sliding rail 572. The stamping head 574 is fixed on the end of the stamping plate 573. The bottom of the stamping head 574 is provided with a pressing block 575. The bottom of the pressing block 575 is provided with an upper stamping surface 576 for stamping the welding strip raw material 300. The upper stamping surface 576 is in the shape of a "Z" letter, which can stamp the cylindrical welding strip raw material 300 into a "Z" shaped welding strip 400. A suction hole 577 is formed on the stamping surface 576. An air suction port 578 is arranged on the pressing block 575 and communicates with the suction hole 577. After the stamping upper die and the stamping lower die complete the stamping and shaping of the welding strip raw material 300, the stamping upper die adsorbs and translates the welding strip 400 to the assembling and welding mechanism 3, and the assembling and welding mechanism 3 assembles and welds the battery piece 200 and the welding strip 400. The welding strip 400 can be formed in multiple pieces at one time. The part of each welding strip 400 that overlaps with the main grid line after stamping is consistent in size with the main grid line of the battery piece. The welding strip is in the shape of a flat "Z" letter and is cut into a segmented structure after stamping.

[0090] As shown in Figure 8 , 12 As shown, the stamping lower die of the embodiment includes a lower die cylinder 581 and a lower die seat 582. The lower die seat 582 is fixed on the piston rod of the lower die cylinder 581. The lower die seat 582 is provided with a stamping groove 583. The bottom surface of the stamping groove 583 is provided with a lower stamping surface 585 for stamping the welding strip raw material. The end of the stamping groove 583 is provided with a cutting step 584 for cutting the welding strip raw material 300. During stamping, the pressing block 575 of the stamping upper die presses the welding strip raw material 300 into the stamping groove 583 to form a shape. During the stamping process, the pressing block 575 and the cutting step 584 cooperate to cut the welding strip raw material 300 to obtain the required length of the welding strip.

[0091] As shown in Figure 13 , 14As shown, the welding lamp box mechanism 6 of the embodiment includes lamp box supports 61, fourth electric cylinders 62, fourth mounting plates 63 and lamp boxes 64, two lamp box supports 61 are respectively located at two ends of the lamp box 64, the fourth sliding rails 65 are arranged on the lamp box supports 61, the fourth sliding blocks 66 that cooperate with the fourth sliding rails 65 are arranged at two ends of the lamp box 64, the fourth mounting plates 63 are fixed on the lamp box supports 61, the fourth electric cylinders 62 are fixed on the fourth mounting plates 63, and the fourth electric cylinders 62 drive the lamp box 64 to move up and down. The assembled welding mechanism 3 moves the battery piece 200 with the welded strip 400 to below the lamp box 64, sets the heating temperature of the assembled welding mechanism 3, and then the lamp box 64 is pressed down. After the overall height of the lamp box 64 is lowered to the welding station, the pressing needle 641 of the lamp box 64 is pressed on the welded strip 400, the toughness of the pressing needle 641 is used to apply a certain pressure downward to fix the welded strip 400 and the battery piece 200, then the lamp tube 642 of the lamp box 64 is set to the welding temperature and welding power parameters, the welding time is 1-2s, the battery piece 200 is connected in series through the welded strip 400, and thus the plurality of battery pieces 200 are welded into a battery string.

[0092] As shown in the figure, Figures 15 to 22 As shown, the assembled welding mechanism 3 of the embodiment includes a transmission assembly 31, a guide rail assembly 32 and a plurality of platform assemblies 33 that can move on the guide rail assembly 32, the transmission assembly 31 includes fifth electric cylinders 311, fifth sliding rails 312 and a carrier plate 313, the guide rail assembly 32 is arranged on the carrier plate 313, the transmission assembly 31 drives the carrier plate 313 to move the guide rail assembly 32, the two ends of the guide rail assembly 32 are respectively provided with a driving assembly 34 for pushing the platform assembly 33 to move, and the platform assembly 33 is used for placing the battery piece 200 and assembling and welding the battery piece 200; one battery piece 200 is placed on each platform assembly 33, and a welded strip 400 is arranged between every two battery pieces 200. When assembling, one platform assembly 33 moves to another platform assembly 33 to assemble and weld two battery pieces 200 and the welded strip 400 together.

[0093] As shown in the figure, Figure 16 As shown, the guide rail assembly 32 of the embodiment is two parallel guide rails, a cylinder seat is connected between the end portions of the two guide rails, and the driving assembly 34 is fixed on the cylinder seat. The driving assembly 34 of the embodiment is a driving cylinder, the piston rod of the driving cylinder pushes the bottom plate 335 of the platform assembly 33 to move, so as to drive the platform assembly 33 to move close to each other to perform the assembling action.

[0094] As shown in the figure, Figure 17As shown, the platform assembly 33 of the embodiment includes a hot plate 331, a connecting plate 332, a jacking assembly 333, a movable assembly 334 and a bottom plate 335. The hot plate 331 and the connecting plate 332 are provided with a heat insulation bakelite 336 therebetween. Four threaded holes 3314 are formed at four corners of the hot plate 331. Four long screws are sequentially screwed through the threaded holes of the hot plate 331, the heat insulation bakelite 336 and the connecting plate 332. The bottom plate 335 is provided with sliding blocks 3351 at both ends of the bottom plate 335 for sliding on the guide rail assembly 32.

[0095] As shown in Figure 17 , the battery piece 200 is placed on the hot plate 331 and is fixed by vacuum suction holes 3311 on the top surface of the hot plate 331. The vacuum suction holes 3311 are connected with an external vacuum pump through air pipes. Two heating rods 3312 are arranged in the hot plate 331 for heating the hot plate 331. The hot plate 331 is combined with the lamp box mechanism 6 to weld the two battery pieces 200 and the solder strip 400 together. The hot plate 331 is provided with a temperature sensor 3313 for monitoring the temperature of the hot plate 331 in real time. The welding temperature is 160-230°C, the vacuum value of the suction air pressure is -4.5-2kp, and the heating temperature of the hot plate 331 is 120-160°C.

[0096] When the battery piece 200 is welded, as shown in Figure 21 , the two battery pieces 200 are respectively located on the left and right sides of the solder strip 400. The top surface of the left battery piece 200 is welded with the solder strip 400, and the bottom surface of the right battery piece 200 is connected with the solder strip 400. During the assembly of the two battery pieces 200, the right battery piece 200 collides with the solder strip 400 because the right battery piece 200 and the solder strip 400 are in the same plane, which causes the right battery piece 200 to be unable to move to the solder strip 400. Therefore, the movable assembly 334 is arranged on the top of the bottom plate 335, and the jacking assembly 333 is arranged on the bottom plate 335. One end of the connecting plate 332 is fixed on the movable assembly 334. During assembly, the other end of the connecting plate 332 is lifted upward by the jacking assembly 333. The connecting plate 332 drives one end of the hot plate 331 to be lifted upward, so that the end of the right battery piece 200 is slightly higher than the solder strip 400, and the right battery piece 200 is smoothly moved to the solder strip 400.

[0097] As shown in Figure 19 , the movable assembly 334 includes a movable plate 3341 and a fixed block 3342. The fixed block 3342 is fixed on the top of the bottom plate 335. A rotating shaft 3343 is rotatably connected in the fixed block 3342. The movable plate 3341 is fixed on the rotating shaft 3343. One end of the connecting plate 332 is fixedly connected with the movable plate 3341.

[0098] As shown in Figure 19As shown, the jacking assembly 333 is a jacking cylinder fixed at the bottom of the bottom plate 335, and the piston rod of the jacking cylinder passes through the bottom plate 335 and is located below the other end of the connecting plate 332. When assembly is needed, the piston rod 3331 of the jacking cylinder extends upward, lifts the end of the connecting plate 332, and lifts the end of the right battery piece 200.

[0099] As shown in the drawings, Figure 17 As shown, the two side walls of the bottom plate 335 of the embodiment perpendicular to the guide rail assembly 32 are provided with springs 35, which play a buffering role when the two platform assemblies 100 move to the assembly position. After assembly is completed, the two platform assemblies 33 are automatically opened due to the force of the springs 35 and return to the initial position.

[0100] As shown in the drawings, Figure 24 、 25 As shown, the battery string unloading mechanism is arranged outside the welding light box mechanism 6, and the battery string unloading mechanism includes an unloading conveying mechanism, an unloading support 81, an unloading driving assembly, and a conveying belt 82. After the battery string is welded, the unloading conveying mechanism carries the battery string to the conveying belt 82. The unloading conveying mechanism of the embodiment is the same as the battery piece conveying mechanism 2, and each end of the unloading support is provided with a guide roller. The unloading driving assembly is installed at the bottom of the unloading support, and the unloading driving assembly includes an unloading motor 83 and a driving roller 84. The unloading motor 83 drives the driving roller 84 to rotate through belt transmission. Two driven roller 85 are installed above the driving roller 84. The conveying belt passes through the guide roller, the driven roller 85 and the driving roller 84, and is driven by the driving roller 84 to move the conveying belt 82 for unloading transportation.

[0101] Embodiment two

[0102] A string welding process of a battery piece string welding system, which comprises the following steps:

[0103] Step S1, the battery piece is loaded by the battery piece loading mechanism;

[0104] The battery piece is placed in the loading box of the battery piece loading mechanism, the loading box is pushed to the loading station, and the battery piece is placed on the calibration platform of the battery piece loading mechanism by the battery piece conveying mechanism. The placement position of the battery piece is calibrated and positioned;

[0105] The calibrated battery piece is conveyed to the assembly and welding mechanism by the battery piece conveying mechanism, the assembly and welding mechanism adsorbs and fixes the battery piece, and waits for assembly with the welding ribbon;

[0106] The battery piece conveying mechanism returns to the loading station;

[0107] Step S2, the welding ribbon raw material is processed and shaped by the welding ribbon unwinding mechanism and the welding ribbon shaping and placing mechanism;

[0108] The solder strip grabbing assembly of the solder strip shaping and placing mechanism grabs the solder strip raw material in the solder strip unwinding mechanism and places it evenly in the stamping lower die of the solder strip shaping and placing mechanism, and the solder strip raw material in the stamping lower die is cut into the required shape and length by the stamping upper die of the solder strip shaping and placing mechanism;

[0109] The stamping upper die of the solder strip shaping and placing mechanism adsorbs and carries the shaped solder strip to the main grid line of the battery piece, and the edge of the solder strip completely coincides with and covers the main grid line;

[0110] Step S3, the battery piece and the solder strip are welded into a battery string by the assembling and welding mechanism and the welding light box mechanism;

[0111] The assembling and welding mechanism sets the temperature for heating, and then moves the combined battery string to the welding station.

[0112] The light box height of the welding light box mechanism is lowered to the welding station, the pressing needle of the light box is pressed onto the solder strip, the solder strip is heated and welded by the lamp tube of the light box for 1-2 seconds, and the battery piece and the battery piece are welded into a battery string by the solder strip.

[0113] The above specific embodiments further illustrate the technical problems solved by the present application, technical solutions and beneficial effects. It should be understood that the above are only specific embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell string welding system, characterized by: The battery piece feeding mechanism (1), the battery piece carrying mechanism (2), the assembling and welding mechanism (3), the welding strip unwinding mechanism (4), the welding strip shaping and placing mechanism (5) and the welding lamp box mechanism (6) are arranged in sequence. The battery piece feeding mechanism (1) is used for storing and transporting the battery pieces. The battery piece carrying mechanism (2) is used for carrying the battery pieces in the battery piece feeding mechanism (1) to the assembling and welding mechanism (3). The welding strip shaping and placing mechanism (5) is used for processing the welding strip raw material into a required shape and length, and placing the processed welding strip on the assembling and welding mechanism (3) so that the edges of the welding strip completely coincide with and cover the main grid lines of the battery pieces. The assembling and welding mechanism (3) is used for assembling the processed welding strip and the battery pieces. The welding lamp box mechanism (6) is used for welding the assembled welding strip and the battery pieces. The two welding strip shaping and placing mechanisms (5) are respectively arranged on the two sides of the assembling and welding mechanism (3), and each welding strip shaping and placing mechanism (5) comprises a welding strip grabbing assembly and a welding strip cutting and shaping assembly. The welding strip grabbing assembly comprises a grabbing support (51), a grabbing driving assembly, a grabbing slide plate (52) and a clamping jaw assembly, the grabbing driving assembly is fixed on the grabbing support (51), the grabbing driving assembly drives the grabbing slide plate (52) to move, the clamping jaw assembly is arranged on the grabbing slide plate (52), and the clamping jaw assembly is used for grabbing the welding strip raw material on the welding strip unwinding mechanism (4) into the welding strip cutting and shaping assembly. The welding strip cutting and shaping assembly comprises a shaping support (53), a shaping moving assembly, an upper punch and a lower punch, the shaping moving assembly is arranged on the shaping support (53), the shaping moving assembly drives the upper punch to move up and down, and the lower punch and the upper punch punch and shape the welding strip raw material. The shaping moving assembly comprises a moving plate (561), a moving motor (562), a lead screw, a nut (563), a moving slide block (564) and a moving slide rail (565), the moving slide block (564) is fixed on the shaping support (53), the moving slide rail (565) is fixed on the side wall of the moving plate (561), the moving slide block (564) and the moving slide rail (565) slide in cooperation, the moving motor (562) is fixed on the top of the moving plate (561), the lead screw is fixed on the motor shaft of the moving motor (562), the nut (563) is fixed on the side wall of the moving plate (561), and the moving motor (562) drives the nut (563) to move up and down. The stamping upper die comprises a third electric cylinder (571), a third sliding rail (572), a stamping plate (573) and a stamping head (574), the third electric cylinder (571) and the third sliding rail (572) are horizontally arranged on the other side wall of the moving plate (561) respectively, the stamping plate (573) is fixed on the electric cylinder sliding block of the third electric cylinder (571), the third electric cylinder (571) drives the stamping plate (573) to move horizontally on the third sliding rail (572), the stamping head (574) is fixed on the end of the stamping plate (573), the bottom of the stamping head (574) is provided with a pressing block (575), the bottom of the pressing block (575) is provided with an upper stamping surface (576) for stamping the welding strip raw material, the upper stamping surface (576) is provided with a suction hole (577), the pressing block (575) is provided with a suction port (578), and the suction port (578) is in communication with the suction hole (577). The stamping lower die comprises a lower die cylinder (581) and a lower die seat (582), the lower die seat (582) is fixed on the piston rod of the lower die cylinder (581), the lower die seat (582) is provided with a stamping groove (583), the bottom surface of the stamping groove (583) is provided with a lower stamping surface (585) for stamping the welding strip raw material, and the end of the stamping groove (583) is provided with a cutting step (584) for cutting the welding strip raw material.

2. The battery cell string welding system of claim 1, wherein: The battery piece feeding mechanism (1) comprises a feeding plate (11), a feeding box (12), a feeding sliding rail (13) and a feeding jacking mechanism (15), the bottom of the feeding plate (11) is slidably connected with the feeding sliding rail (13) through a feeding sliding block (14), a plurality of feeding boxes (12) are fixed on the feeding plate (11), the bottom of the feeding box (12) and the feeding plate (11) are both provided with a through hole for the feeding jacking mechanism (15) to pass through, and the feeding jacking mechanism (15) is used for jacking the battery plate in the feeding box (12).

3. The battery cell string welding system of claim 1, wherein: The battery piece feeding mechanism (1) further comprises a calibration platform (7), the calibration platform (7) comprises a positioning mounting plate (71), the positioning mounting plate (71) is provided with a supporting shaft (72) and a cylinder mounting plate (73), the supporting shaft (72) is provided with a positioning upper plate (74), a group of adjacent edges of the positioning upper plate (74) are both provided with a positioning groove (741), the cylinder mounting plate (73) is provided with a sliding table cylinder (75), the sliding block of the sliding table cylinder (75) is provided with a positioning shaft mounting plate, the positioning shaft mounting plate is provided with a positioning shaft (76) matched with the positioning groove (741) of the positioning upper plate (74), another group of adjacent edges of the positioning upper plate (74) are both provided with a positioning block (77), and the two positioning blocks (77) are vertically arranged.

4. The battery cell string welding system of claim 1, wherein: The battery piece conveying mechanism (2) comprises an electric cylinder mounting plate (23) and square tube supports arranged on both sides of the battery piece feeding mechanism (1), a first sliding rail (21) is arranged on the square tube support on one side of the battery piece feeding mechanism (1), a first electric cylinder (22) is arranged on the square tube support on the other side of the battery piece feeding mechanism (1), one end of the electric cylinder mounting plate (23) is in sliding connection with the first sliding rail (21), the other end of the electric cylinder mounting plate (23) is connected with the electric cylinder sliding block of the first electric cylinder (22), the first electric cylinder (22) drives the electric cylinder mounting plate (23) to move, a second electric cylinder (24) is arranged on the electric cylinder mounting plate (23), and a vacuum suction nozzle (25) for sucking the battery piece is arranged on the driving rod of the second electric cylinder (24).

5. The battery cell string welding system of claim 1, wherein: The solder strip unwinding mechanism (4) is used for transporting solder strip raw materials to the solder strip shaping and placing mechanism (5), and two groups of the solder strip unwinding mechanisms (4) are respectively located on the two sides of the assembling and welding mechanism (3). The solder strip unwinding mechanism (4) comprises an unwinding support, a plurality of load rollers (40) are sequentially arranged on the feeding side of the unwinding support from top to bottom, a first guide wheel (41), a second guide wheel (42) and a third guide wheel (43) are sequentially arranged between the feeding side and the discharging side of the unwinding support, a lifting wheel (46) and a lifting support are arranged below the second guide wheel (42), the lifting wheel (46) is fixed on a lifting sliding block (47), the lifting support is internally provided with a sliding rod (48) for the lifting sliding block (47) to slide up and down, a discharging support is arranged on the discharging side of the unwinding support, a fourth guide wheel (44) and a fifth guide wheel (45) are arranged on the discharging support, and the fourth guide wheel (44) is located below the fifth guide wheel (45).

6. The battery piece string welding system according to claim 1, characterized in that: The grabbing driving assembly comprises a grabbing motor, a driving wheel (541), a belt (542) and a driven wheel, the grabbing motor is fixed at one end of a grabbing support (51), the driving wheel (541) is fixed on the grabbing motor, the driven wheel is rotatably connected to the other end of the grabbing support (51), the driving wheel (541) and the driven wheel are in transmission connection through the belt (542), and the grabbing sliding plate (52) is fixed on the belt (542); The clamping jaw assembly comprises a movable jaw (551), a fixed jaw (552), a telescopic cylinder (553) and a connecting rod (554) fixed on a piston rod of the telescopic cylinder (553), the telescopic cylinder (553) is fixed on the grabbing sliding plate (52), one end of the movable jaw (551) is hinged to the connecting rod (554), the other end of the movable jaw (551) is hinged to the fixed jaw (552), and the fixed jaw (552) is fixed on the side wall of the grabbing sliding plate (52).

7. The battery cell string welding system of claim 1, wherein: The welding lamp box mechanism (6) comprises a lamp box support (61), a fourth electric cylinder (62), a fourth mounting plate (63) and a lamp box (64), two lamp box supports (61) are respectively located at two ends of the lamp box (64), a fourth sliding rail (65) is arranged on the lamp box support (61), the two ends of the lamp box (64) are provided with fourth sliding blocks (66) matched with the fourth sliding rail (65) for sliding, the fourth mounting plate (63) is fixed on the lamp box support (61), and the fourth electric cylinder (62) is fixed on the fourth mounting plate (63).

8. The battery cell string welding system of claim 1, wherein: The assembling and welding mechanism (3) comprises a transmission assembly (31), a guide rail assembly (32) and a plurality of platform assemblies (33) capable of moving on the guide rail assembly (32), the transmission assembly (31) drives the guide rail assembly (32) to move, and the two ends of the guide rail assembly (32) are respectively provided with a driving assembly (34) for pushing the platform assembly (33) to move, and the platform assembly (33) is used for placing and assembling and welding the battery piece; The guide rail assembly (32) comprises two parallel guide rails; The platform assembly (33) comprises a hot plate (331), a mounting plate, a jacking assembly (333), a movable assembly (334) and a bottom plate (335), the bottom ends of the bottom plate (335) are respectively provided with sliding blocks for sliding on the guide rails, the hot plate (331) is arranged on the mounting plate, the movable assembly (334) is arranged on the top of the bottom plate (335), the jacking assembly (333) is fixedly connected with the bottom plate (335), one end of the mounting plate is fixed on the movable assembly (334), and the jacking assembly (333) is used for driving the other end of the mounting plate to be lifted upwards.

9. A string welding process of the battery piece string welding system according to any one of claims 1 to 8, characterized by, It comprises the following steps: Step S1, the battery piece feeding mechanism (1) is used for feeding the battery piece; The battery piece is placed in the feeding box (12) of the battery piece feeding mechanism (1), the feeding box (12) is pushed to the feeding station, the battery piece is placed on the calibration platform (7) of the battery piece feeding mechanism (1) by the battery piece carrying mechanism (2), and the placement position of the battery piece is calibrated and positioned; The calibrated battery piece is carried to the assembling and welding mechanism (3) by the battery piece carrying mechanism (2), the battery piece is adsorbed and fixed by the assembling and welding mechanism (3), and waiting for assembling with the solder strip; The battery piece carrying mechanism (2) returns to the feeding station; Step S2, the solder strip feeding mechanism (4) and the solder strip shaping and placing mechanism (5) are used for processing and shaping the solder strip raw material; The solder strip grabbing assembly of the solder strip shaping and placing mechanism (5) grabs the solder strip raw material in the solder strip feeding mechanism (4) and uniformly places it in the stamping lower die of the solder strip shaping and placing mechanism (5), and the solder strip raw material in the stamping lower die is cut into the required shape and length by the stamping upper die of the solder strip shaping and placing mechanism (5); The stamping upper die of the solder strip shaping and placing mechanism (5) adsorbs and transports the shaped solder strip to the main grid line of the battery piece, and the edge of the solder strip is completely overlapped with the main grid line. Step S3, welding the battery pieces and the solder strips into a battery string by the assembling and welding mechanism (3) and the welding lamp box mechanism (6); A plurality of battery pieces and solder strips are assembled and connected in series by the assembling and welding mechanism (3), and then the assembling and welding mechanism (3) sets the heating temperature and moves the assembled battery string to a welding station; The lamp box (64) of the welding lamp box mechanism (6) is lowered to the welding station, the pressing needle of the lamp box (64) is pressed onto the solder strip, the lamp tube of the lamp box (64) is heated for 1-2 seconds, and the battery pieces are connected in series by the solder strip to form a battery string.

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