Solder strip clamping mechanism and battery string repairing machine

Abstract

The invention provides a welding strip clamping mechanism and a battery string repairing machine. The welding strip clamping mechanism comprises a moving mechanism, a mounting bracket, a first guide mounting seat, a second guide mounting seat, an opening and closing driving mechanism, an elastic pressing mechanism, a first chuck and a second chuck, wherein the first chuck and the second chuck are arranged in pairs. The first chuck is connected to the first guide mounting base in a floating mode, and the second chuck is connected to the second guide mounting base in a floating mode. The elastic pressing mechanism is arranged on the mounting support and used for driving the second chuck to rotate in the horizontal plane, so that the clamping end of the second chuck is aligned with the clamping end of the corresponding first chuck. The opening and closing driving mechanism is arranged on the mounting support and used for driving the first guide mounting base and the second guide mounting base to be close to the middle or separated towards the two sides and driving the second chuck and the first chuck to clamp or release the welding strip. According to the welding strip clamping mechanism, it can be ensured that the clamping end of the second clamping head is aligned with the clamping end of the first clamping head, and therefore a gap between the two clamped welding strips is reduced or eliminated.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic cell string repair, and specifically to a solder strip clamping mechanism and a cell string repair machine. Background Art

[0002] When there are defective cells in a battery string, the battery string can be repaired. Fig.11 Taking the middle battery string as an example, the connecting ribbon between the defective battery cell 300 and the adjacent battery cell 400 is cut off. The cutting position of the ribbon is as follows: Fig.11 The defective battery cell is then removed from the battery string, and a replacement battery cell 500 with a soldering ribbon is placed in the vacant position after the defective battery cell 300 is removed, and the soldering ribbon on the replacement battery cell 500 (only one soldering ribbon is shown on the front and back sides of the replacement battery cell) is overlap-welded with the soldering ribbon on the adjacent battery cell 400.

[0003] When performing lap welding, a welding strip clamping mechanism is required to first clamp the welding strip on the replacement battery cell 500 and the welding strip on the adjacent battery cell 400 together. The welding strip clamping area is located at Fig.11 The B area in the figure is located directly above the battery cell. The existing solder strip clamping mechanism is usually equipped with multiple groups of clamps to clamp multiple pairs of solder strips at the same time. If two clamps in a group of clamps cannot be aligned due to some circumstances, a large gap is likely to appear between the two solder strips clamped by the group of clamps; or if there are foreign objects such as tin beads on a solder strip on an adjacent battery cell (tin beads may be formed on the solder strip during the string soldering process), the obstruction of the foreign objects will also cause a large gap between the two solder strips after clamping. The existence of the gap will result in the inability to smoothly climb the tin between the two solder strips to achieve overlap during the welding process, thereby affecting the overall rework quality of the battery string. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a welding strip clamping mechanism, and its detailed technical solution is as follows:

[0005] A welding strip clamping mechanism comprises a moving mechanism, a mounting bracket, a first guide mounting seat, a second guide mounting seat, an opening and closing driving mechanism, an elastic pressing mechanism and a plurality of first chucks and second chucks arranged in pairs, wherein:

[0006] The mounting bracket is connected to the driving end of the moving mechanism, and the moving mechanism is at least used to drive the mounting bracket to rise and fall;

[0007] The opening and closing driving mechanism is installed on the mounting bracket, and the first guide mounting seat and the second guide mounting seat are both connected to the driving end of the opening and closing driving mechanism;

[0008] The first chucks are arranged side by side, and each first chuck is connected to the first guide mounting seat via a first floating assembly so as to float up and down; the second chucks are arranged side by side, and each second chuck is connected to the second guide mounting seat via a second floating assembly so as to float up and down, and can rotate in a horizontal plane relative to the second guide mounting seat;

[0009] The elastic clamping mechanism is installed on the mounting bracket, and a plurality of elastic parts corresponding to the second clamps are provided on the driving end of the elastic clamping mechanism, and reference blocks are respectively provided on the second guide mounting seat corresponding to each second clamp, and the elastic clamping mechanism is configured to be able to drive the elastic part to push each second clamp to rotate in a horizontal plane to abut against the corresponding reference block, so that the clamping end of each second clamp is aligned with the clamping end of the corresponding first clamp; the elastic part can also be elastically deformed when subjected to the reverse force of the corresponding second clamp;

[0010] The opening and closing drive mechanism is used to drive the first guide mounting seat and the second guide mounting seat to move closer to the middle after the clamping end of the second chuck is aligned with the clamping end of the corresponding first chuck, so that the clamping end of the second chuck cooperates with the clamping end of the corresponding first chuck to clamp the welding strip; the opening and closing drive mechanism is also used to drive the first guide mounting seat and the second guide mounting seat to separate to both sides, so that the clamping end of the second chuck and the clamping end of the corresponding first chuck release the welding strip.

[0011] The solder strip clamping mechanism provided by the present application is such that each first clamp and each second clamp can be connected to the corresponding guide mounting seat in a floating manner up and down. With such a configuration, the first clamp and the second clamp can realize adaptive adjustment of the relative positions in the height direction after they descend to contact the battery cell, thereby ensuring that the first clamp and the second clamp can be aligned in the height direction; at the same time, by providing an elastic clamping mechanism and a reference block, the solder strip clamping mechanism provided by the present application can also adaptively adjust the angle of the clamping end of the second clamp in the horizontal direction, thereby ensuring that the clamping end of the second clamp can be aligned with the clamping end of the first clamp before clamping the solder strip, and can reduce or eliminate the solder beads when there are no solder beads on the solder strip. Except for the gap between the two soldering strips after being clamped; on the other hand, even if there are tin beads on the soldering strips, the tin beads can force the second clamp to rotate after clamping to cause elastic deformation of the elastic part. When the tin beads melt again during the welding process, the second clamp can be rotated back to the reference position again under the action of the elastic part, thereby reducing or eliminating the gap between the two soldering strips, and finally making the two soldering strips able to smoothly climb tin to achieve overlap during the welding process, thereby ensuring the quality of the lap welding; in addition, the elastic clamping mechanism has a driving end, and the elastic clamping mechanism drives the elastic part to push the second clamp to abut the reference block after the second clamp completes the floating in the height direction, thereby avoiding the jamming of the second clamp when floating.

[0012] In some embodiments, the first floating assembly includes a first guide column, a first spring, a first chuck mounting seat and a floating guide assembly, wherein: the upper and lower ends of the first guide column are respectively fixedly connected to the first guide mounting seat, the first chuck mounting seat is slidably mounted on the first guide column, the first spring is mounted on the first guide column, the upper end of the first spring abuts against the first guide mounting seat, and the lower end of the first spring abuts against the first chuck mounting seat; the first chuck is mounted on the first chuck mounting seat, and the clamping end of the first chuck extends downward from the first chuck mounting seat; the floating guide assembly is arranged between the first chuck mounting seat and the first guide mounting seat, and is used to limit the first chuck mounting seat to vertical movement.

[0013] A first floating assembly with a simple structure is provided, which realizes the floating connection between the first clamp mounting seat and the first guide mounting seat through the expansion and contraction adjustment of the first spring, so that the first clamp can realize the adaptive adjustment of the relative position in the height direction after it descends and contacts the battery sheet. In addition, by setting the floating guide assembly, the first clamp can only float up and down along the first guide column and cannot rotate around the first guide column, which ensures that the first clamp will not deflect after floating in the height direction, and finally ensures that after the second clamp abuts against the reference block, the clamping end of the second clamp can be aligned with the clamping end of the first clamp.

[0014] In some embodiments, the floating guide assembly includes a limiting wheel and a limiting plate, wherein: the limiting wheel is fixedly mounted on the first chuck mounting seat; the limiting plate is fixedly mounted on the first guide mounting seat, and a limiting groove extending in the vertical direction is provided on the side of the limiting plate opposite to the limiting wheel; the limiting wheel is slidably fitted into the limiting groove.

[0015] A floating guide assembly with a simple structure is provided, which realizes the vertical floating guide of a first clamp mounting seat and can prevent the first clamp mounting seat from getting stuck during the floating process.

[0016] In some embodiments, the second floating assembly includes a second guide column, a second spring and a second chuck mounting seat, wherein: the upper and lower ends of the second guide column are respectively fixedly connected to the second guide mounting seat, the second chuck mounting seat is slidably mounted on the second guide column, the second spring is mounted on the second guide column, the upper end of the second spring abuts against the second guide mounting seat, and the lower end of the second spring abuts against the second chuck mounting seat; the second chuck is mounted on the second chuck mounting seat, and the clamping end of the second chuck extends downward from the second chuck mounting seat.

[0017] A second floating assembly with a simple structure is provided, which realizes a floating connection between a second clamp mounting seat and a second guide mounting seat through the telescopic adjustment of a second spring, so that the second clamp can realize adaptive adjustment of the relative position in the height direction after it descends and contacts the battery cell, and the second clamp mounting seat can also rotate around the second guide column after being subjected to force, thereby driving the second clamp to realize rotation in a horizontal plane.

[0018] In some embodiments, the elastic clamping mechanism includes a sliding mounting plate, a translational driving unit and a plurality of elastic parts, wherein: the translational driving unit is mounted on a mounting bracket, the sliding mounting plate is slidably mounted on the mounting bracket, and is connected to a driving end of the translational driving unit; a plurality of elastic parts are fixedly mounted on the sliding mounting plate, and the elastic parts are located on the side of the corresponding second chuck mounting seat away from the second chuck; the translational driving unit is used to drive the sliding mounting plate to translate, so as to drive the elastic part to move toward or away from the corresponding second chuck mounting seat; when the elastic part moves toward the corresponding second chuck mounting seat, the elastic part pushes the second chuck mounting seat to rotate around the second guide column in a horizontal plane, so as to drive the second chuck to rest against the corresponding reference block.

[0019] When the translation driving unit drives the sliding mounting plate to translate, it can synchronously push each second chuck mounting seat to rotate around the second guide column in the horizontal plane through the elastic part thereon, thereby driving each second chuck to abut against the corresponding reference block. Therefore, even if the second chuck is deflected during the floating process along the height direction, the second chuck can return to the reference position when abutting against the reference block under the push of the elastic part, thereby ensuring that the clamping ends of each second chuck are aligned with the clamping ends of the corresponding first chuck before clamping the welding strip.

[0020] In some embodiments, the elastic part includes a spring limiting plate, a third guide rod, a third spring and a push plate, wherein: the spring limiting plate is fixedly mounted on the sliding mounting plate; the first end of the third guide rod is slidably connected to one of the spring limiting plate or the push plate, and the second end of the third guide rod is fixedly connected to the other of the spring limiting plate or the push plate; the third spring is sleeved on the third guide rod, the first end of the third spring abuts against the elastic limiting plate, and the second end of the third spring abuts against the push plate; when the elastic part moves toward the corresponding second chuck, the push plate pushes the second chuck mounting seat to rotate, and the third spring contracts under pressure.

[0021] An elastic part with a simple structure is provided, which realizes the elastic connection between the push plate and the spring limit plate through the telescopic adjustment of the third spring, so that the push plate can elastically push the second chuck mounting seat, so that the second chuck mounting seat can rotate adaptively.

[0022] In some embodiments, a stop wheel is fixedly mounted on one side of the second chuck mounting seat close to the push plate, and the push plate drives the second chuck mounting seat to rotate by pushing the stop wheel.

[0023] The blocking wheel is used as the contact part between the second chuck mounting seat and the push plate, so that the second chuck mounting seat can be ensured to rotate smoothly.

[0024] In some embodiments, the opening and closing drive mechanism includes a motor, a cam, a first cam follower, a second cam follower and a fourth spring, wherein: the motor is arranged on a mounting bracket, and the cam is connected to a driving shaft of the motor; the first cam follower is mounted on a first guide mounting seat, and the first cam follower is located on a first side of the cam, and the second cam follower is mounted on a second guide mounting seat, and the second cam follower is located on a second side of the cam; the first end of the fourth spring is connected to the first guide mounting seat, and the second end of the fourth spring is connected to the second guide mounting seat, and the fourth spring is used to pull the first guide mounting seat and the second guide mounting seat toward the middle, and the first cam follower and the second cam follower are pressed against the cam; when the motor drives the cam to rotate, it drives the first cam follower and the second cam follower to move closer or farther away, thereby driving the first guide mounting seat and the second guide mounting seat to move closer to the middle or separate to both sides.

[0025] The invention provides an opening and closing driving mechanism with a simple structure, which can drive a first guide mounting seat and a second guide mounting seat to move toward the middle or to separate toward both sides by only one motor.

[0026] In some embodiments, the bottom surface of the clamping end of the first clamp includes a first bottom surface, a second bottom surface and a first side elevation, wherein the first bottom surface is lower than the second bottom surface, and the first side elevation is located between the first bottom surface and the second bottom surface; the bottom surface of the clamping end of the second clamp includes a third bottom surface, a fourth bottom surface and a second side elevation, wherein the third bottom surface is lower than the fourth bottom surface, the second side elevation is located between the third bottom surface and the fourth bottom surface, the second side elevation is opposite to the first side elevation and a space for exposing the welding strip is formed therebetween, and the second side elevation and the first side elevation approach or move away from each other with the relative movement of the first guide mounting seat and the second guide mounting seat to clamp or release the welding strip; the first bottom surface and the third bottom surface are used to abut the battery cell; the height from the second bottom surface to the first bottom surface and the height from the fourth bottom surface to the third bottom surface are both greater than h and less than 2h, where h is the height of the welding strip.

[0027] By setting the clamping end of the first clamp and the clamping end of the second clamp, it can be achieved that: when the first clamp and the second clamp are lowered, the first bottom surface of the first clamp and the third bottom surface of the second clamp can contact the battery cell and finally reach the same height after floating, and the welding strip to be clamped enters between the first side elevation of the first clamp and the second side elevation of the second clamp, and then the first clamp and the second clamp move toward the middle, thereby driving the first side elevation of the first clamp and the second side elevation of the second clamp to clamp the welding strip; in addition, the height between the second bottom surface and the first bottom surface and the height between the fourth bottom surface and the third bottom surface are set to be greater than the height of the welding strip and less than twice the height of the welding strip, which can prevent the two welding strips to be welded from being stacked up and down after being clamped, and finally ensure the welding effect.

[0028] In some embodiments, a vertical first through hole is provided on the clamping end of the first clamp, and a vertical second through hole is provided on the clamping end of the second clamp. When the clamping ends of the first clamp and the second clamp clamp the solder strip, the solder strip is exposed from the first through hole and the second through hole; the first through hole and the second through hole are both ventilation holes, or the first through hole and the second through hole are both light-transmitting holes.

[0029] When the first through hole and the second through hole are used as ventilation holes, the solder strip after welding can be cooled; when the first through hole and the second through hole are used as light-transmitting holes, they can be used to pass the welding laser, which can extend the heated length of the solder strip and ensure the welding quality.

[0030] The present application also provides a battery string repair machine, which includes a solder strip cutting mechanism, a repair platform, a carrier, a replacement battery cell feeding mechanism, a welding mechanism, and any of the above solder strip clamping mechanisms, wherein:

[0031] The repair platform is used to carry the battery string to be repaired, and to stagger the defective battery cells with the first side adjacent battery cells in the vertical direction, and / or to stagger the defective battery cells with the second side adjacent battery cells in the vertical direction, wherein the first side adjacent battery cells are battery cells adjacent to the defective battery cells in the battery string to be repaired and located on the first side of the defective battery cells, and the second side adjacent battery cells are battery cells adjacent to the defective battery cells in the battery string to be repaired and located on the second side of the defective battery cells;

[0032] The solder strip cutting mechanism is used to cut the solder strip between the defective battery cell and the adjacent battery cell on the first side, and / or to cut the solder strip between the defective battery cell and the adjacent battery cell on the second side;

[0033] The carrying platform is used to carry a replacement battery cell, and a first side welding strip and a second side welding strip are welded on the replacement battery cell;

[0034] The replacement cell loading mechanism is used to pick up the replacement cell from the carrier platform and load the replacement cell to the defective position in the battery string on the rework platform, where the defective position is the position vacated after the defective cell is removed;

[0035] The welding strip clamping mechanism is used to clamp the welding strip on the first side of the replacement battery cell located at the defective position with the welding strip to be overlapped on the adjacent battery cell on the first side, and / or clamp the welding strip on the second side of the replacement battery cell located at the defective position with the welding strip to be overlapped on the adjacent battery cell on the second side;

[0036] The welding mechanism is used to weld the first side welding strip of the clamped replacement battery cell with the welding strip to be overlapped on the first side adjacent battery cell, and / or weld the second side welding strip of the clamped replacement battery cell with the welding strip to be overlapped on the second side adjacent battery cell.

[0037] Through the cooperation of the solder ribbon cutting mechanism, the rework platform, the carrying platform, the replacement battery cell feeding mechanism, the welding mechanism and the solder ribbon clamping mechanism, the battery string rework machine of the present application realizes the automatic rework of the battery string to be reworked. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the three-dimensional structure of the welding ribbon clamping mechanism in the embodiment of the present application at an angle;

[0039] Figure 2 It is a side view structural schematic diagram of the welding ribbon clamping mechanism in the embodiment of the present application;

[0040] Figure 3 It is a front view structural schematic diagram of the welding strip clamping mechanism in the embodiment of the present application;

[0041] Figure 4 It is a rear structural schematic diagram of the welding ribbon clamping mechanism in the embodiment of the present application;

[0042] Figure 5 This is a schematic diagram of the installation structure of the first clamp and the first guide mounting seat in the embodiment of the present application;

[0043] Figure 6 Schematic diagram of the top view of the solder strip clamping mechanism in the embodiment of the present application;

[0044] Figure 7 It is a bottom view structural schematic diagram of the welding strip clamping mechanism in the embodiment of the present application;

[0045] Figure 8 It is a schematic diagram of the three-dimensional structure of the welding ribbon clamping mechanism in the embodiment of the present application at another angle;

[0046] Fig. 9 for Figure 8A magnified view of region A in FIG.

[0047] Fig.10 It is a schematic diagram of the structure of the first chuck and the second chuck in the embodiment of the present application;

[0048] Fig.11 This is a schematic diagram of the battery string repair method;

[0049] Figures 1 to 10 Included:

[0050] Mounting bracket 1;

[0051] First guide mount 2:

[0052] Second guide mounting seat 3: reference block 31;

[0053] Opening and closing drive mechanism 4:

[0054] Motor 41, cam 42, first cam follower 43, second cam follower 44, fourth spring 45;

[0055] Elastic clamping mechanism 5:

[0056] Elastic part 51: spring limiting plate 511, third spring 512, push plate 513;

[0057] Sliding mounting plate 52;

[0058] Translation drive unit 53;

[0059] First chuck 6:

[0060] A first bottom surface 61, a second bottom surface 62, a first side elevation 63, and a first through hole 64;

[0061] Second chuck 7:

[0062] A third bottom surface 71, a fourth bottom surface 72, a second side elevation surface 73, and a second through hole 74;

[0063] First floating component 8:

[0064] A first spring 81;

[0065] A first chuck mounting seat 82;

[0066] Floating guide assembly 83: limiting wheel 831, limiting plate 832, limiting groove 833;

[0067] Second floating component 9:

[0068] A second spring 91, a second chuck mounting seat 92, and a blocking wheel 921;

[0069] A first welding ribbon 100 and a second welding ribbon 200 . DETAILED DESCRIPTION

[0070] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0071] The existing solder strip clamping mechanism is usually equipped with multiple groups of clamps to clamp multiple pairs of solder strips at the same time. If two clamps in a group of clamps cannot be aligned due to some circumstances, a large gap will easily appear between the two solder strips clamped by the group of clamps; or if there are foreign objects such as tin beads on a solder strip on an adjacent battery cell (tin beads may be formed on the solder strip during the string soldering process), a large gap will appear between the two solder strips after clamping due to the obstruction of foreign objects. The existence of the gap will result in the inability to smoothly climb the tin between the two solder strips to achieve overlap during the welding process, thereby affecting the overall rework quality of the battery string.

[0072] In order to solve the above-mentioned problems existing in the existing soldering strip clamping mechanism, the present application provides a soldering strip clamping mechanism, which can ensure that the two soldering strips can be smoothly soldered and overlapped during the welding process.

[0073] like Figures 1 to 10 As shown, the welding strip clamping mechanism in the embodiment of the present application includes a moving mechanism (not shown in the figure), a mounting bracket 1, a first guide mounting seat 2, a second guide mounting seat 3, an opening and closing driving mechanism 4, an elastic pressing mechanism 5 and a plurality of first chucks 6 and second chucks 7 arranged in pairs, wherein:

[0074] The mounting bracket 1 is connected to the driving end of the moving mechanism, and the moving mechanism is at least used to drive the mounting bracket 1 to move up and down. Optionally, the moving mechanism can also be configured to drive the mounting bracket to translate along the X and / or Y direction.

[0075] The opening and closing driving mechanism 4 is mounted on the mounting bracket 1 , and the first guide mounting seat 2 and the second guide mounting seat 3 are both connected to the driving end of the opening and closing driving mechanism 4 .

[0076] The first clamps 6 are arranged side by side, and each first clamp 6 is connected to the first guide mounting seat 2 via a first floating assembly 8 so as to float up and down. The second clamps 7 are arranged side by side, and each second clamp 7 is connected to the second guide mounting seat 3 via a second floating assembly 9 so as to float up and down, and can rotate relative to the second guide mounting seat 3 in a horizontal plane.

[0077] The elastic clamping mechanism 5 is mounted on the mounting bracket 1, and a plurality of elastic parts 51 corresponding to the second clamps 7 are provided on the driving end of the elastic clamping mechanism 5, and a reference block 31 is provided on the second guide mounting seat 3 corresponding to each second clamp 7, and the elastic clamping mechanism 5 is configured to be able to drive the elastic part 51 to push each second clamp 7 to rotate in a horizontal plane to abut against the corresponding reference block 31, so that the clamping end of each second clamp 7 is aligned with the clamping end of the corresponding first clamp 6. The elastic part 51 can also be elastically deformed when subjected to the reverse force of the corresponding second clamp 7.

[0078] The opening and closing driving mechanism 4 is used to drive the first guide mounting seat 2 and the second guide mounting seat 3 to move closer to the middle after the clamping end of the second clamp 7 is aligned with the clamping end of the corresponding first clamp 6, so that the clamping end of the second clamp 7 cooperates with the clamping end of the corresponding first clamp 6 to clamp the welding strip; the opening and closing driving mechanism 4 is also used to drive the first guide mounting seat 2 and the second guide mounting seat 3 to separate to both sides, so that the clamping end of the second clamp 7 and the clamping end of the corresponding first clamp 6 release the welding strip; wherein the extension direction of the welding strip is as shown in FIG. Figure 7 Indicated by the direction of the arrow.

[0079] The solder strip clamping mechanism in the embodiment of the present application is suitable for clamping a group of first solder strips and a group of second solder strips respectively connected to two adjacent battery cells. The specific clamping process is as follows:

[0080] In the initial state, each group of first clamps 6 and the corresponding second clamps 7 are in an open state (such as Fig.10 ).

[0081] Next, the position of the mounting bracket 1 is adjusted so that the clamping gaps between each group of first clamps 6 and second clamps 7 are aligned with the corresponding pair of first welding strips 100 and second welding strips 200 to be overlapped.

[0082] Next, the moving mechanism drives the mounting bracket 1 to descend. Since the first clamp 6 is connected to the first guide mounting seat 2 by floating up and down via the first floating component 8, and the second clamp 7 is connected to the second guide mounting seat 3 by floating up and down via the second floating component 9, as the mounting bracket 1 descends, the first clamp 6 and the second clamp 7 can realize adaptive adjustment of the relative position in the height direction after contacting the battery cell, and finally ensure that the first clamp 6 and the second clamp 7 are both in contact with the battery cell to realize alignment in the height direction.

[0083] Then, the elastic clamping mechanism 5 drives each second clamp 7 to rotate in the horizontal plane through the elastic portion 51 thereon, until each second clamp 7 abuts against the corresponding reference block 31, so that the clamping end of each second clamp 7 is aligned with the clamping end of the corresponding first clamp 6. In addition, the elastic portion 51 is elastically deformed due to the reverse force of the corresponding second clamp 7.

[0084] Finally, the opening and closing drive mechanism 4 drives the first guide mounting seat 2 and the second guide mounting seat 3 to move toward the middle, driving the clamping ends of each second clamp 7 to be synchronously clamped with the clamping ends of the corresponding first clamp 6, so as to synchronously implement the horizontal overlap of each pair of first welding strips 100 and second welding strips 200.

[0085] It can be seen that the welding strip clamping mechanism provided in the present application, since each first clamp 6 and each second clamp 7 can be connected to the corresponding guide mounting seat in a floating manner up and down, with such an arrangement, the first clamp 6 and the second clamp 7 can realize adaptive adjustment of the relative position in the height direction after they descend to contact the battery cell, thereby ensuring that the first clamp 6 and the second clamp 7 can be aligned in the height direction.

[0086] At the same time, by setting an elastic clamping mechanism 5, the soldering strip clamping mechanism provided in the present application can also adaptively adjust the angle of the clamping end of the second clamp 7 in the horizontal direction, thereby ensuring that the clamping end of the second clamp 7 is aligned with the clamping end of the first clamp 6, ensuring that the two soldering strips can smoothly climb tin to achieve overlap during the welding process, and ultimately ensuring the quality of the lap weld.

[0087] When there are no foreign objects such as tin beads on the first welding strip and the second welding strip to be overlapped, after the first welding strip and the second welding strip are clamped by the clamping ends of the aligned first clamp 6 and the second clamp 7, the gap between the clamped first welding strip and the second welding strip can be reduced or eliminated, so that the first welding strip and the second welding strip can be smoothly tinned during the welding process, thereby improving the overlap quality.

[0088] In the case where there are foreign objects such as tin beads on the first welding strip and the second welding strip to be overlapped, after the first welding strip and the second welding strip are clamped by the clamping ends of the aligned first clamp 6 and the second clamp 7, there will still be a large gap between the clamped first welding strip and the second welding strip due to the obstruction of the foreign objects, but due to the presence of the elastic part 51, the foreign objects can force the second clamp 7 to rotate, causing the elastic part 51 to elastically deform. After the foreign objects are melted again during the welding process, under the action of the elastic part 51, the second clamp 7 can be rotated back to the reference position again, thereby reducing or eliminating the gap between the first welding strip and the second welding strip, so that the first welding strip and the second welding strip can smoothly climb tin during the welding process, improving the overlap quality.

[0089] In addition, the elastic clamping mechanism 5 has a driving end, and the elastic clamping mechanism 5 drives the elastic part 51 to push the second chuck 7 to abut the reference block 31 after the second chuck 7 completes floating in the height direction. Therefore, the second chuck 7 is not affected by forces in other directions during the floating process along the height direction, thereby achieving smooth floating and avoiding the second chuck 7 from getting stuck when floating.

[0090] like Figure 1 , Figure 5 , Figure 7 and Fig. 9 As shown, optionally, the first floating assembly 8 includes a first guide post, a first spring 81, a first chuck mounting seat 82 and a floating guide assembly 83, wherein: the upper and lower ends of the first guide post are respectively fixedly connected to the first guide mounting seat 2, the first chuck mounting seat 82 is slidably sleeved on the first guide post, the first spring sleeve 81 is mounted on the first guide post, the upper end of the first spring 81 abuts on the first guide mounting seat 2, and the lower end of the first spring 81 abuts on the first chuck mounting seat 82. The first chuck 6 is mounted on the first chuck mounting seat 82, and the clamping end of the first chuck 6 extends downward from the first chuck mounting seat 82.

[0091] Since a first spring 81 is provided between the first clamp mounting seat 82 and the first guide mounting seat 2, when the moving mechanism drives the mounting bracket 1 to descend, under the telescopic adjustment of the first spring 81, the first clamp 6 can realize adaptive adjustment of the relative position in the height direction after descending and contacting the battery cell.

[0092] The floating guide assembly 83 is disposed between the first chuck mounting seat 82 and the first guide mounting seat 2, and the floating guide assembly 83 is used to limit the first chuck mounting seat 82 to move in the vertical direction. That is, under the guidance of the floating guide assembly 83, the first chuck mounting seat 82 and the first chuck 6 mounted thereon can only float in the vertical direction and cannot rotate in the horizontal plane, and finally ensure that when the second chuck 7 rotates to the first chuck 6, the clamping end of the second chuck 7 is aligned with the clamping end of the first chuck 6.

[0093] like Figure 1 , Figure 7 and Fig. 9 As shown, optionally, the floating guide assembly 83 includes a limiting wheel 831 and a limiting plate 832, wherein: the limiting wheel 831 is fixedly mounted on the first chuck mounting seat 82, the limiting plate 832 is fixedly mounted on the first guide mounting seat 2, and a limiting groove 833 extending in the vertical direction is provided on the side of the limiting plate 832 opposite to the limiting wheel 831. The limiting wheel 831 is slidably fitted in the limiting groove 833. Since the limiting wheel 831 can only slide up and down along the limiting groove 833, the first chuck mounting seat 82 can only float up and down along the first guide column, and will not rotate around the first guide column.

[0094] Only one limiting plate 832 may be provided, on which a plurality of limiting grooves 833 corresponding to the limiting wheels 831 are provided. Of course, a plurality of limiting plates 832 may also be provided, each limiting plate 832 corresponds to a limiting wheel 831, and each limiting plate 832 is provided with a limiting groove 833.

[0095] By implementing floating guidance for the first chuck mounting seat 82 through the limiting wheel 831 and the limiting groove 833, the first chuck mounting seat 82 can be restricted to move vertically, and the floating smoothness of the first chuck mounting seat 82 can be improved to avoid the first chuck mounting seat 82 from getting stuck during the floating process.

[0096] like Figure 1 As shown, optionally, the second floating assembly 9 includes a second guide post, a second spring 91 and a second chuck mounting seat 92, wherein: the upper and lower ends of the second guide post are respectively fixedly connected to the second guide mounting seat 3, the second chuck mounting seat 92 is slidably mounted on the second guide post, the second spring 91 is mounted on the second guide post, the upper end of the second spring 91 abuts against the second guide mounting seat 3, and the lower end of the second spring 91 abuts against the second chuck mounting seat 92. The second chuck 7 is mounted on the second chuck mounting seat 92, and the clamping end of the second chuck 7 extends downward from the second chuck mounting seat 92.

[0097] Since a second spring 91 is provided between the second chuck mounting seat 92 and the second guide mounting seat 3, when the moving mechanism drives the mounting bracket 1 to descend, under the telescopic adjustment of the second spring 91, the second chuck 7 can realize adaptive adjustment of the relative position in the height direction after descending and contacting the battery cell, and the second chuck mounting seat 92 can also rotate around the second guide column after being subjected to force, thereby driving the second chuck 7 to realize rotation in the horizontal plane.

[0098] like Figures 1 to 3 , Figure 7 and Fig. 9 As shown, optionally, the elastic clamping mechanism 5 includes a sliding mounting plate 52, a translation driving unit 53 and a plurality of elastic parts 51 as described above, wherein: the translation driving unit 53 is mounted on the mounting bracket 1, and the sliding mounting plate 52 is slidably mounted on the mounting bracket 1 and connected to the driving end of the translation driving unit 53. The plurality of elastic parts 51 are fixedly mounted on the sliding mounting plate 52, and the elastic parts 51 are located on a side of the corresponding second chuck mounting seat 92 away from the second chuck 7.

[0099] The translation drive unit 53 is used to drive the sliding mounting plate 52 to translate, so as to drive each elastic part 51 to move toward or away from the corresponding second chuck mounting seat 92. When the elastic part 51 moves toward the corresponding second chuck mounting seat 92, the elastic part 51 pushes the second chuck mounting seat 92 to rotate around the second guide column in the horizontal plane, thereby driving the second chuck 7 to abut against the corresponding reference block 31.

[0100] The translation driving unit 53 may adopt various existing linear driving mechanisms capable of driving the sliding mounting plate 52 to slide and translate relative to the mounting bracket 1, such as a cylinder driving mechanism composed of a cylinder, a slide rail and a slider.

[0101] like Figure 2 , Figure 7 and Fig. 9 As shown, the elastic part 51 includes a spring limiting plate 511, a third guide rod, a third spring 512 and a push plate 513, wherein: the spring limiting plate 511 is fixedly mounted on the sliding mounting plate 52. The first end of the third guide rod is slidably connected to one of the spring limiting plate 511 or the push plate 513, and the second end of the third guide rod is fixedly connected to the other of the spring limiting plate 511 or the push plate 513. The third spring 512 is sleeved on the third guide rod, the first end of the third spring 512 abuts on the elastic limiting plate 511, and the second end of the third spring 512 abuts on the push plate 513. When the elastic part 51 moves toward the corresponding second chuck 7, the push plate 513 pushes the second chuck mounting seat 92 to rotate, and the third spring 512 is compressed and contracted.

[0102] It can be seen that by setting the third spring 512 between the push plate 513 and the spring limit plate 511, the elastic connection between the push plate 513 and the spring limit plate 511 can be achieved through the telescopic adjustment of the third spring 512, so that the push plate 513 can elastically push the second chuck mounting seat 92 to allow the second chuck mounting seat 92 to rotate.

[0103] like Figure 7 As shown, optionally, a stopper wheel 921 is fixedly installed on one side of the second chuck mounting seat 92 close to the push plate 513, and the push plate 513 drives the second chuck mounting seat 92 to rotate by pushing the stopper wheel 921. The stopper wheel 921 is used as the contact part between the second chuck mounting seat 92 and the push plate 513 to ensure that the second chuck mounting seat 92 can rotate smoothly.

[0104] like Figure 3 , Figure 6 and Figure 7 As shown, optionally, the opening and closing driving mechanism 4 includes a motor 41, a cam 42, a first cam follower 43, a second cam follower 44 and a fourth spring 45, wherein: the motor 41 is arranged on the mounting bracket 1, and the cam 42 is connected to the driving shaft of the motor 41. The first cam follower 43 is mounted on the first guide mounting seat 2, and the first cam follower 43 is located on the first side of the cam 42. The second cam follower 44 is mounted on the second guide mounting seat 2, and the second cam follower 44 is located on the second side of the cam 42. The first end of the fourth spring 45 is connected to the first guide mounting seat 2, and the second end of the fourth spring 45 is connected to the second guide mounting seat 3. The fourth spring 45 is used to pull the first guide mounting seat 2 and the second guide mounting seat 3 toward the middle, so that the first cam follower 43 and the second cam follower 44 are pressed against the cam 42. When the motor 41 drives the cam 42 to rotate, it drives the first cam follower 43 and the second cam follower 44 to move closer or farther away, thereby driving the first guide mounting seat 2 and the second guide mounting seat 3 to move closer to the middle or separate to both sides, and finally drives each pair of first clamping jaws 6 and second clamping jaws 7 to clamp or separate.

[0105] It can be seen that by setting the opening and closing drive mechanism 4, only one motor is needed to drive the first guide mounting seat 2 and the second guide mounting seat 3 to move toward the middle or to separate to both sides, thereby reducing the structural complexity and cost of the opening and closing drive mechanism 4.

[0106] like Fig.10 As shown, optionally, the bottom surface of the clamping end of the first clamp 6 includes a first bottom surface 61, a second bottom surface 62 and a first side elevation 63, wherein the first bottom surface 61 is lower than the second bottom surface 62, and the first side elevation 63 is located between the first bottom surface 61 and the second bottom surface 62. The bottom surface of the clamping end of the second clamp 7 includes a third bottom surface 71, a fourth bottom surface 72 and a second side elevation 73, wherein the third bottom surface 71 is lower than the fourth bottom surface 72, and the second side elevation 73 is located between the third bottom surface 71 and the fourth bottom surface 72, and the second side elevation 73 is opposite to the first side elevation 63 and a space for exposing the overlap area of ​​the welding strip is formed therebetween, and the second side elevation 73 and the first side elevation 63 move closer to or farther from each other with the relative movement of the first guide mounting seat 2 and the second guide mounting seat 3 to clamp or release the welding strip. The first bottom surface 61 and the third bottom surface 71 are used to abut against the battery sheet.

[0107] By performing the above-mentioned settings on the clamping ends of the first clamp 6 and the second clamp 7, it can be achieved that, as the first clamp 6 and the second clamp 7 descend, the first bottom surface 61 of the first clamp 6 and the third bottom surface 71 of the second clamp 7 can float upward after contacting the battery cell, and finally reach the same height, and the welding strip to be clamped enters between the first side elevation 63 of the first clamp 6 and the second side elevation 73 of the second clamp 7, and then the first clamp 6 and the second clamp 7 move toward the middle, thereby driving the first side elevation 63 and the second side elevation 73 to smoothly clamp the welding strip, and the welding mechanism can pass through the space formed between the second side elevation 73 and the first side elevation 63 for exposing the overlapping area of ​​the welding strip to implement welding on the overlapping part of the welding strip.

[0108] Optionally, the height between the second bottom surface 62 and the first bottom surface 61 and the height between the fourth bottom surface 72 and the third bottom surface 71 are both greater than h and less than 2h, where h is the height of the welding strip. This arrangement can prevent the two welding strips to be welded from being stacked up and down after being clamped, thereby ultimately ensuring the welding effect.

[0109] Optionally, a vertical first through hole 64 is further provided on the clamping end of the first clamp 6, and a vertical second through hole 74 is further provided on the clamping end of the second clamp 7. When the clamping ends of the first clamp 6 and the second clamp 7 clamp the welding strip, the welding strip is exposed from the first through hole 64 and the second through hole 74. Optionally, the first welding strip 100 is exposed from the first through hole 64, and the second welding strip 200 is exposed from the second through hole 74.

[0110] The first through hole 64 and the second through hole 74 can be used as ventilation holes. During welding, by blowing air toward the ventilation holes, the temperature of the welded solder strip can be cooled. The first through hole 64 and the second through hole 74 can also be used as light-transmitting holes. In this case, laser welding can be used to make the laser beam pass through the light-transmitting holes to irradiate the solder strip, thereby extending the heated length of the two solder strips, accelerating the melting of the solder on the solder strip, and ensuring the welding quality.

[0111] The embodiment of the present application also provides a battery string repair machine, which includes a welding strip cutting mechanism, a repair platform, a carrier, a replacement battery cell feeding mechanism, a welding mechanism and a welding strip clamping mechanism in any of the above embodiments, wherein: the repair platform is used to carry the battery string to be repaired, and stagger the defective battery cell and the first side adjacent battery cell in the vertical direction, and / or stagger the defective battery cell and the second side adjacent battery cell in the vertical direction, wherein the first side adjacent battery cell is a battery cell adjacent to the defective battery cell in the battery string to be repaired and located on the first side of the defective battery cell, and the second side adjacent battery cell is a battery cell adjacent to the defective battery cell in the battery string to be repaired and located on the second side of the defective battery cell. The welding strip cutting mechanism is used to cut the welding strip between the defective battery cell and the first side adjacent battery cell, and / or cut the welding strip between the defective battery cell and the second side adjacent battery cell. The carrier is used to carry the replacement battery cell, and the replacement battery cell is welded with the first side welding strip and the second side welding strip. The replacement cell loading mechanism is used to pick up the replacement cell from the carrier platform, and to load the replacement cell to the defective position in the cell string on the rework platform, where the defective position is the position vacated after the defective cell is removed. The welding strip clamping mechanism is used to clamp the first side welding strip of the replacement cell located at the defective position with the welding strip to be overlapped on the adjacent cell on the first side, and / or to clamp the second side welding strip of the replacement cell located at the defective position with the welding strip to be overlapped on the adjacent cell on the second side. The welding mechanism is used to weld the first side welding strip of the clamped replacement cell with the welding strip to be overlapped on the adjacent cell on the first side, and / or to weld the second side welding strip of the clamped replacement cell with the welding strip to be overlapped on the adjacent cell on the second side.

[0112] Through the cooperation of the solder ribbon cutting mechanism, the rework platform, the carrying platform, the replacement battery cell feeding mechanism, the welding mechanism and the solder ribbon clamping mechanism, the battery string rework machine of the present application realizes the automatic rework of the battery string to be reworked.

[0113] The present application is described in sufficient detail above with certain particularity. It should be understood by those skilled in the art that the description in the embodiments is merely exemplary, and all changes made without departing from the true spirit and scope of the present application should fall within the scope of protection of the present application. The scope of protection claimed in the present application is defined by the claims, rather than by the above description in the embodiments.

Claims

1. A welding strip clamping mechanism, characterized in that: The welding strip clamping mechanism comprises a moving mechanism, a mounting bracket, a first guide mounting seat, a second guide mounting seat, an opening and closing driving mechanism, an elastic pressing mechanism and a plurality of first chucks and second chucks arranged in pairs, wherein: The mounting bracket is connected to the driving end of the moving mechanism, and the moving mechanism is at least used to drive the mounting bracket to rise and fall; The opening and closing driving mechanism is mounted on the mounting bracket, and the first guide mounting seat and the second guide mounting seat are both connected to the driving end of the opening and closing driving mechanism; The first chucks are arranged side by side, and each of the first chucks is connected to the first guide mounting seat via a first floating assembly so as to float up and down; the second chucks are arranged side by side, and each of the second chucks is connected to the second guide mounting seat via a second floating assembly so as to float up and down, and can rotate relative to the second guide mounting seat in a horizontal plane; The elastic clamping mechanism is installed on the mounting bracket, and a plurality of elastic parts corresponding to the second clamps are provided on the driving end of the elastic clamping mechanism, and reference blocks corresponding to the second clamps are respectively provided on the second guide mounting seat, and the elastic clamping mechanism is configured to be able to drive the elastic parts to push the second clamps to rotate in the horizontal plane to abut against the corresponding reference blocks, so that the clamping ends of the second clamps are aligned with the clamping ends of the corresponding first clamps; the elastic parts can also be elastically deformed when subjected to the reverse force of the corresponding second clamps; The opening and closing drive mechanism is used to drive the first guide mounting seat and the second guide mounting seat to move toward the middle after the clamping end of the second clamp is aligned with the corresponding clamping end of the first clamp, so that the clamping end of the second clamp cooperates with the corresponding clamping end of the first clamp to clamp the welding strip; the opening and closing drive mechanism is also used to drive the first guide mounting seat and the second guide mounting seat to separate to both sides, so that the clamping end of the second clamp and the corresponding clamping end of the first clamp release the welding strip.

2. The solder strip clamping mechanism according to claim 1, characterized in that: The first floating assembly includes a first guide column, a first spring, a first chuck mounting seat and a floating guide assembly, wherein: The upper and lower ends of the first guide column are respectively fixedly connected to the first guide mounting seat, the first chuck mounting seat is slidably sleeved on the first guide column, the first spring is sleeved on the first guide column, the upper end of the first spring abuts against the first guide mounting seat, and the lower end of the first spring abuts against the first chuck mounting seat; The first chuck is mounted on the first chuck mounting seat, and the clamping end of the first chuck extends downwardly out of the first chuck mounting seat; The floating guide assembly is disposed between the first chuck mounting seat and the first guide mounting seat, and is used to limit the first chuck mounting seat to move in a vertical direction.

3. The solder strip clamping mechanism according to claim 2, characterized in that: The floating guide assembly includes a limiting wheel and a limiting plate, wherein: The limiting wheel is fixedly mounted on the first chuck mounting seat; The limiting plate is fixedly mounted on the first guide mounting seat, and a limiting groove extending in the vertical direction is arranged on the side of the limiting plate opposite to the limiting wheel; The limiting wheel is inserted into the limiting groove in a sliding manner.

4. The solder strip clamping mechanism according to claim 1, characterized in that: The second floating assembly includes a second guide column, a second spring and a second chuck mounting seat, wherein: The upper and lower ends of the second guide post are respectively fixedly connected to the second guide mounting seat, the second chuck mounting seat is slidably sleeved on the second guide post, the second spring is sleeved on the second guide post, the upper end of the second spring abuts against the second guide mounting seat, and the lower end of the second spring abuts against the second chuck mounting seat; The second chuck is mounted on the second chuck mounting seat, and the clamping end of the second chuck extends downwardly out of the second chuck mounting seat.

5. The solder strip clamping mechanism according to claim 4, characterized in that: The elastic pressing mechanism comprises a sliding mounting plate, a translation driving unit and a plurality of elastic parts, wherein: The translation drive unit is mounted on the mounting bracket, and the sliding mounting plate is slidably mounted on the mounting bracket and connected to the driving end of the translation drive unit; A plurality of the elastic parts are fixedly mounted on the sliding mounting plate, and the elastic parts are located on a side of the corresponding second chuck mounting seat away from the second chuck; The translation driving unit is used to drive the sliding mounting plate to translate, so as to drive the elastic part to move toward or away from the corresponding second chuck mounting seat; When the elastic portion moves toward the corresponding second chuck mounting seat, the elastic portion pushes the second chuck mounting seat to rotate around the second guide column in a horizontal plane, so as to drive the second chuck to abut against the corresponding reference block.

6. The solder strip clamping mechanism according to claim 5, characterized in that: The elastic part includes a spring limiting plate, a third guide rod, a third spring and a push plate, wherein: The spring limiting plate is fixedly mounted on the sliding mounting plate; The first end of the third guide rod is slidably connected to one of the spring limit plate or the push plate, and the second end of the third guide rod is fixedly connected to the other of the spring limit plate or the push plate; The third spring is sleeved on the third guide rod, the first end of the third spring abuts against the elastic limiting plate, and the second end of the third spring abuts against the push plate; When the elastic portion moves toward the corresponding second clamp, the push plate pushes the second clamp mounting seat to rotate, and the third spring contracts under pressure.

7. The solder strip clamping mechanism according to claim 6, characterized in that: A blocking wheel is fixedly mounted on one side of the second chuck mounting seat close to the push plate, and the push plate drives the second chuck mounting seat to rotate by pushing the blocking wheel.

8. The solder strip clamping mechanism according to claim 1, characterized in that: The opening and closing driving mechanism includes a motor, a cam, a first cam follower, a second cam follower and a fourth spring, wherein: The motor is arranged on the mounting bracket, and the cam is connected to the driving shaft of the motor; The first cam follower is mounted on the first guide mounting seat, the first cam follower is located on a first side of the cam, and the second cam follower is mounted on the second guide mounting seat, the second cam follower is located on a second side of the cam; The first end of the fourth spring is connected to the first guide mounting seat, and the second end of the fourth spring is connected to the second guide mounting seat. The fourth spring is used to pull the first guide mounting seat and the second guide mounting seat toward the middle, so that the first cam follower and the second cam follower are pressed against the cam; When the motor drives the cam to rotate, the first cam follower and the second cam follower are driven to move closer to or farther away from each other, thereby driving the first guide mounting seat and the second guide mounting seat to move closer to the middle or to move away from each other.

9. The solder strip clamping mechanism according to claim 1, characterized in that: The bottom surface of the clamping end of the first clamp includes a first bottom surface, a second bottom surface and a first side elevation surface, wherein the first bottom surface is lower than the second bottom surface, and the first side elevation surface is located between the first bottom surface and the second bottom surface; The bottom surface of the clamping end of the second clamp includes a third bottom surface, a fourth bottom surface and a second side elevation surface, wherein the third bottom surface is lower than the fourth bottom surface, the second side elevation surface is located between the third bottom surface and the fourth bottom surface, the second side elevation surface is opposite to the first side elevation surface and a space for exposing the welding strip is formed therebetween, and the second side elevation surface and the first side elevation surface move closer to or farther from each other with the relative movement of the first guide mounting seat and the second guide mounting seat to clamp or release the welding strip; The first bottom surface and the third bottom surface are used to abut against the battery cell; the height between the second bottom surface and the first bottom surface and the height between the fourth bottom surface and the third bottom surface are both greater than h and less than 2h, where h is the height of the welding strip.

10. The solder strip clamping mechanism according to claim 9, characterized in that: A vertical first through hole is also provided on the clamping end of the first clamp, and a vertical second through hole is also provided on the clamping end of the second clamp. When the clamping ends of the first clamp and the second clamp clamp the solder strip, the solder strip is exposed from the first through hole and the second through hole. The first through hole and the second through hole are both ventilation holes, or the first through hole and the second through hole are both light-transmitting holes.

11. A battery string repair machine, characterized in that: The battery string repair machine comprises a solder strip cutting mechanism, a repair platform, a carrying platform, a replacement battery cell feeding mechanism, a welding mechanism and a solder strip clamping mechanism according to any one of claims 1 to 10, wherein: The repair platform is used to carry the battery string to be repaired, and stagger the defective battery cell and the first side adjacent battery cell in the vertical direction, and / or stagger the defective battery cell and the second side adjacent battery cell in the vertical direction, wherein the first side adjacent battery cell is a battery cell in the battery string to be repaired that is adjacent to the defective battery cell and located on the first side of the defective battery cell, and the second side adjacent battery cell is a battery cell in the battery string to be repaired that is adjacent to the defective battery cell and located on the second side of the defective battery cell; The solder strip cutting mechanism is used to cut the solder strip between the defective battery cell and the first side adjacent battery cell, and / or to cut the solder strip between the defective battery cell and the second side adjacent battery cell; The carrying platform is used to carry a replacement battery cell, and the replacement battery cell is welded with a first side welding strip and a second side welding strip; The replacement cell loading mechanism is used to pick up the replacement cell from the carrier platform, and load the replacement cell to the defective position in the battery string on the rework platform, where the defective position is the position vacated after the defective cell is removed; The welding strip clamping mechanism is used to clamp the first side welding strip of the replacement battery cell located at the defective position and the welding strip to be overlapped on the adjacent battery cell on the first side together, and / or clamp the second side welding strip of the replacement battery cell located at the defective position and the welding strip to be overlapped on the adjacent battery cell on the second side together; The welding mechanism is used to weld together the first side welding strip of the clamped replacement battery cell and the welding strip to be overlapped on the adjacent battery cell on the first side, and / or to weld together the second side welding strip of the clamped replacement battery cell and the welding strip to be overlapped on the adjacent battery cell on the second side.

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