Laser welding mechanism and battery string repair device

Abstract

The application provides a laser welding mechanism and a battery string repair device. The laser welding mechanism comprises a mounting frame, n fiber-coupled lasers, n mounting seats and n condenser lenses. The n mounting seats are arranged side by side on the mounting frame, and each mounting seat is provided with a condenser lens. The n fiber-coupled lasers are arranged on the mounting frame and are connected to the mounting seats one by one. The light outlet of the fiber head of each fiber-coupled laser is opposite to the condenser lens on the connected mounting seat. The laser emitted by each fiber-coupled laser is transmitted to the condenser lens on the corresponding mounting seat through the fiber head. The laser received by the condenser lens is emitted after being converged. Each mounting seat can be deflected relative to the mounting frame to adjust the light emitting direction of the condenser lens. The application realizes simultaneous welding of n pairs of overlapped welding strips in a welding strip group, and improves the welding efficiency. Since each mounting seat can be independently deflected to adjust the light emitting direction, it can be ensured that the n laser beams can be aligned with the n welding positions one by one.

Description

Technical Field

[0001] This application relates to the field of photovoltaic equipment, and in particular to a laser welding mechanism and a battery string repair device. Background Technology

[0002] When defective cells are found in a battery string, the string can be repaired. Figure 1 Taking a battery string as an example, the solder strip between the defective battery cell 300 and its adjacent battery cell 400 is cut off. The cut position of the solder strip is as follows: Figure 1 The defective battery cell 300 is removed from the battery string by marking the "×" position. The replacement battery cell 500 with the solder ribbon group is then placed in the empty position after the defective battery cell 300 is removed. The N solder ribbons in the solder ribbon group on the replacement battery cell 500 are overlapped with the N solder ribbons in the solder ribbon group on the adjacent battery cell 400. Finally, the N overlapped parts are welded.

[0003] Currently, laser welding mechanisms are generally used to weld the aforementioned N overlapping joints. Existing laser welding mechanisms typically include a laser generator, a galvanometer, and a field lens. The laser emitted by the laser generator passes through the galvanometer and field lens and is directed at an overlapping joint, welding the two weld strips together. By controlling the deflection of the galvanometer, the laser emitted by the laser generator sequentially welds the weld strips at each overlapping joint. Therefore, it is evident that existing laser welding mechanisms have low welding efficiency. Utility Model Content

[0004] To address the aforementioned technical problems, this application provides a laser welding mechanism, the detailed technical solution of which is as follows:

[0005] A laser welding mechanism includes a mounting frame, n fiber-coupled lasers, n mounting bases, and n focusing lenses, wherein:

[0006] n mounting bases are arranged side by side on the mounting frame along the first direction, and each mounting base is equipped with a condenser lens;

[0007] n fiber-coupled lasers are mounted on a mounting frame. The fiber heads of the n fiber-coupled lasers are connected to the n mounting bases one by one. The light output of each fiber head is opposite to the condenser lens on the mounting base to which it is connected.

[0008] A condenser lens is used to focus the received laser light before it is emitted.

[0009] Each mount is configured to deflect relative to the mount frame to adjust the light output direction of the condenser lens;

[0010] n≥2.

[0011] The laser welding mechanism provided in this application, by setting up n fiber-coupled lasers and their corresponding focusing lenses, enables simultaneous welding of n pairs of overlapping weld strips in a weld strip group, thereby improving welding efficiency during battery string rework. In particular, by setting n to be equal to the number of weld strips to be overlapped in the weld strip group, simultaneous welding of all overlapping weld strips in the weld strip group can be completed in one go, further improving welding efficiency.

[0012] Furthermore, since each mounting base can be independently deflected to adjust the direction of the emitted light, it can be ensured that the emitted n lasers can be aligned with the n overlapping parts to be welded, thus achieving synchronous and precise welding of the n overlapping parts.

[0013] In some embodiments, the mounting base includes a first support, a first deflection seat, a first deflection adjustment component, and a connector, wherein: the first support is fixed on a mounting frame, the first support is provided with a first light-emitting hole, and the mounting frame is provided with a first through hole communicating with the first light-emitting hole; the first deflection seat is connected to the first support via the first deflection adjustment component, the first deflection adjustment component is used to adjust the deflection angle of the first deflection seat relative to the first support, the first deflection seat is provided with a mounting hole communicating with the first light-emitting hole, and a condenser lens is disposed in the mounting hole; the connector is disposed on the first deflection seat and communicates with the mounting hole, the connector is used to connect with an optical fiber head, and the laser beam focused by the condenser lens is emitted downward through the first light-emitting hole and the first through hole.

[0014] A simple and easily adjustable mounting base is provided. By adjusting the angle of the first deflection base using a first deflection adjustment component, the light emission direction of the condenser lens mounted within the first deflection base can be flexibly adjusted, ultimately ensuring that the laser is accurately projected onto the corresponding lap joint to be welded. Furthermore, since the first support and mounting frame are respectively provided with a first light emission hole and a first through hole, it can be ensured that the laser can pass sequentially through the first support and mounting frame before exiting downwards.

[0015] In some embodiments, the first deflection adjustment assembly includes: at least three sets of elastic members arranged circumferentially around the mounting hole and the first light-emitting hole, the lower end of the elastic member being connected to the first support, the upper end of the elastic member being connected to the first deflection seat, and the elastic member being capable of extending and retracting in the vertical direction; at least three sets of adjustment members arranged circumferentially around the mounting hole and the first light-emitting hole, each adjustment member including a screw and a locking nut, wherein the screw is screwed vertically onto the first deflection seat, the lower end of the screw extends downward through the first deflection seat and abuts against the first support, and the upper end of the screw extends upward through the first deflection seat; the locking nut is screwed onto the upper end of the screw and presses against the upper surface of the first deflection seat.

[0016] A structurally stable and easily adjustable first deflection adjustment component is provided. When it is necessary to adjust the angle of the first deflection seat, it is only necessary to selectively tighten the screws of one or more adjustment components, and then tighten the lock nut after tightening them to the correct position.

[0017] In some embodiments, the first support is provided with a support groove corresponding to each screw. The support groove has a V-shaped structure and includes a first support inclined surface and a second support inclined surface arranged opposite to each other. The lower end of the screw abuts against the first support inclined surface and the second support inclined surface of the corresponding support groove. Alternatively, the first support is provided with a support rod group corresponding to each screw. The support rod group includes a first support rod and a second support rod arranged in parallel. The lower end of the screw abuts against the circumferential surface of the corresponding first support rod and the second support rod.

[0018] The lower end of the screw simultaneously abuts against the first and second support inclined surfaces of the corresponding support groove, or simultaneously abuts against the circumferential surfaces of the corresponding first and second support rods, which can ensure the stability of the first support for the screw and prevent the screw from slipping during adjustment.

[0019] In some embodiments, the lower end of the screw has a hemispherical abutment portion.

[0020] By setting the lower end of the screw to a hemispherical shape, the friction between the screw and the support groove, or between the screw and the circumferential surfaces of the first and second support rods, can be reduced, thereby reducing wear.

[0021] In some embodiments, the elastic element includes a first limiting rod, a second limiting rod, and a tension spring, wherein: the first limiting rod is disposed in the first support, the second limiting rod is disposed in the first deflection seat, the lower end of the tension spring is connected to the first limiting rod, and the upper end of the tension spring is connected to the second limiting rod.

[0022] By configuring the elastic element to include a first limiting rod, a second limiting rod, and a tension spring, a firm connection is ensured between the elastic element and the first deflection seat and the first support, and the installation and maintenance of the elastic element are facilitated.

[0023] In some embodiments, the laser welding mechanism further includes a first movable part, and a mounting frame is connected to a movable part of the first movable part. The first movable part is used to drive the mounting frame to translate and move up and down. The mounting frame includes a first bracket, a second bracket, and a base, wherein: the first bracket is connected to the movable part of the first movable part; the second bracket is vertically arranged and connected to the first bracket, and the mounting angle of the second bracket in the vertical plane is configured to be adjustable; the base is horizontally arranged and connected to the second bracket, and the angle of the base in the horizontal plane is configured to be adjustable; n fiber-coupled lasers are arranged on the first bracket; and n mounting seats are arranged on the base.

[0024] By setting the first moving part, the translation and lifting adjustment of the mounting frame are realized, thereby ensuring that n fiber-coupled lasers and the corresponding n condenser lenses can be adjusted to the target position close to the welding strip group to be welded, thereby ensuring the smooth welding of the welding strip group.

[0025] By configuring the mounting bracket to consist of a first bracket, a second bracket, and a base, and configuring the base to rotate in the horizontal plane relative to the second bracket, and configuring the second bracket to rotate in the vertical plane relative to the first bracket, the position of the n mounting seats can be flexibly adjusted. In this way, during subsequent welding, only a small angle adjustment of the condenser lens through the mounting seat is needed to ensure that the laser is projected onto the welding strip.

[0026] In some embodiments, the second bracket is rotatably connected to the first bracket via a horizontally arranged first rotating shaft. The second bracket has two first waist holes located on both sides of the first rotating shaft, and the first waist holes extend in a vertical direction. The first bracket has two first screw holes corresponding to the first waist holes one by one. The first bolt passes through the first waist hole and is screwed into the first screw hole. The laser welding mechanism also includes a first set screw and a first spring arranged in a vertical direction and located on both sides of the first rotating shaft. The first set screw is screwed to the first bracket and its end abuts against the top of the second bracket. The upper end of the first spring is connected to the first bracket, and the lower end of the first spring is connected to the top of the second bracket.

[0027] A simple and easy-to-adjust installation method for the second bracket is provided. When the installation angle of the second bracket needs to be adjusted, the first bolt is loosened, and the second bracket is rotated around the first pivot by tightening the first set screw, thereby adjusting the installation angle of the second bracket. After the installation angle of the second bracket is adjusted to the correct position, the first bolt is tightened again to fix the second bracket back to the first bracket.

[0028] In some embodiments, the mounting bracket further includes a base plate, which is horizontally arranged and connected to the second bracket. A base is rotatably connected to the base plate via a vertically arranged second rotating shaft. The base is provided with two second waist holes located on both sides of the second rotating shaft. The second waist holes extend in a horizontal direction. The base plate is provided with two second screw holes corresponding to the second waist holes. A second bolt passes through the second waist hole and is screwed into the second screw hole. The laser welding mechanism further includes a second set screw and a second spring arranged in a horizontal direction and located on both sides of the second rotating shaft. The second set screw is screwed to the base plate and its end abuts against the first side of the base. The first end of the second spring is connected to the base plate, and the second end of the second spring is connected to the first side of the base.

[0029] A simple and easy-to-adjust base installation method is provided. When the installation angle of the base needs to be adjusted, loosen the second bolt, and then tighten the second set screw to push the base to rotate around the second pivot, thereby adjusting the installation angle of the base. After the installation angle of the base is adjusted to the correct position, tighten the second bolt to re-fix the base to the second bracket.

[0030] In some embodiments, the laser welding mechanism further includes two guide components disposed on the mounting frame and located on both sides of the n mounting seats along the first direction. The guide components include a second support, a second deflection seat, a second deflection adjustment component, and a guide light source, wherein: the second support is fixedly disposed on the mounting frame, the second support is provided with a second light emission hole, and the mounting frame is provided with a second through hole communicating with the second light emission hole; the second deflection seat is rotatably and adjustablely connected to the second support via the second deflection adjustment component, the second deflection adjustment component being used to adjust the deflection angle of the second deflection seat relative to the second support, and the guide light source is disposed on the second deflection seat; the guide light emitted by the guide light source is emitted through the second light emission hole and the second through hole.

[0031] By setting guide components on both sides of n mounting bases along the first direction, the invisible laser can be adjusted and positioned using visible guide light, ensuring that each welding laser accurately hits the weld strip to be welded during the welding process.

[0032] In some embodiments, the second deflection adjustment assembly includes: at least three sets of elastic connecting assemblies arranged circumferentially around the guide light source and the second light-emitting aperture, each elastic connecting assembly including a first screw and a third spring, wherein the first screw passes through the second deflection seat and is screwed onto the second support, and the third spring is sleeved on the first screw, with both ends of the third spring abutting against the second support and the second deflection seat respectively; at least three second screws arranged circumferentially around the guide light source and the second light-emitting aperture, the second screws being screwed onto the second deflection seat, with the lower ends of the second screws extending downward through the second deflection seat and abutting against the second support.

[0033] A structurally stable and easily adjustable second deflection adjustment assembly is provided. When the angle of the second deflection seat needs to be adjusted, only one or more of the first screws need to be selectively tightened, and the second screw is used for positioning after adjustment.

[0034] This application also provides a battery string repair device, which includes a repair platform, a welding ribbon clamping mechanism, and a laser welding mechanism as described in any one of the above. The repair platform is used to carry the battery string to be repaired and the replacement battery after the defective battery is removed. The replacement battery is located at the defective position in the battery string to be repaired, and the defective position is the position vacated after the defective battery is removed. The welding ribbon clamping mechanism and the laser welding mechanism are both arranged above or on the side of the repair platform. The welding ribbon clamping mechanism is configured to clamp the N first welding ribbons of the replacement battery to the N second welding ribbons on the adjacent battery, so that the ends of the first welding ribbons overlap with the ends of the second welding ribbons, forming N overlapping parts to be welded. The laser welding mechanism is configured to weld the N overlapping parts, wherein the laser emitted by each fiber-coupled laser is used to weld one overlapping part, and n≤N.

[0035] By coordinating the rework platform, the welding strip clamping mechanism, and the laser welding mechanism, the battery string rework device of this application achieves automatic welding of replacement battery cells into the string. In particular, the laser welding mechanism enables precise welding of the N first welding strips of the replacement battery cell to the N overlapping parts of the N second welding strips on the adjacent battery cell, thereby improving the rework quality of the battery string. Attached Figure Description

[0036] Figure 1 This is a diagram illustrating the repair of a battery string.

[0037] Figure 2 This is a three-dimensional structural diagram of the laser welding mechanism according to an embodiment of this application;

[0038] Figure 3 This is a partial top view of the laser welding mechanism according to an embodiment of this application;

[0039] Figure 4 for Figure 3 AA section view;

[0040] Figure 5 This is a schematic diagram of the structure of the mounting base, guide assembly, and other components in an embodiment of this application;

[0041] Figure 6 This is a schematic diagram of the mounting base according to an embodiment of this application from one perspective;

[0042] Figure 7 This is a schematic diagram of the mounting base according to an embodiment of this application from another perspective;

[0043] Figure 8 This is a schematic diagram of the mounting base in this embodiment of the application, omitting the first deflection seat, from one viewpoint.

[0044] Figure 9This is a schematic diagram of the battery string repair device according to an embodiment of this application;

[0045] Figure 10 This is a schematic diagram of the welding strip clamping mechanism according to an embodiment of this application.

[0046] Figures 1 to 10 Includes:

[0047] Laser welding mechanism 10;

[0048] Mounting bracket 1: First bracket 11, second bracket 12, base 13, first pivot 14, first waist hole 15, first set screw 17, first spring 18, base plate 19, second pivot 110, second waist hole 111, second set screw 113, second spring 114;

[0049] Fiber-coupled laser 2: Fiber head 21

[0050] Mounting base 3: First support 31, support groove 311, first support rod 312, second support rod 313, first deflection seat 32, first deflection adjustment component 33, connector 34, first light outlet hole 35, first through hole 39, mounting hole 36, elastic element 37, first limit rod 371, second limit rod 372, tension spring 373, adjusting element 38, screw 381, locking nut 382, ​​abutment part 383, screw sleeve 384;

[0051] Condenser 4;

[0052] First moving part 5: translation module 51, lifting module 52;

[0053] Guide component 6: second support 61, second deflection seat 62, second deflection adjustment component 63, guide light source 64, second light outlet hole 65, second through hole 66, elastic connection component 67, first screw 671, third spring 672, second screw 68;

[0054] 20 repair platforms;

[0055] The welding strip clamping mechanism 30 includes a connecting frame 301, a first movable frame 302, a second movable frame 303, a first clamp 304, a second clamp 305, and a welding clearance hole 306. Detailed Implementation

[0056] To make the above-mentioned objects, features, and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0057] As described in the background section, currently, laser welding mechanisms are generally used to weld N solder strips from a solder strip group on a replacement solar cell to N solder strips from a solder strip group on an adjacent solar cell. Existing laser welding mechanisms typically include a laser generator, a galvanometer, and a field lens. The laser emitted by the laser generator passes through the galvanometer and field lens and is directed at an overlapping area, welding the two solder strips at that overlapping area together. By controlling the deflection of the galvanometer, the laser emitted by the laser generator sequentially welds the solder strips at each overlapping area. Therefore, it is evident that existing laser welding mechanisms have low welding efficiency.

[0058] In view of this, this application provides a laser welding mechanism that can simultaneously weld multiple pairs of overlapping weld strips in a weld strip group, thereby improving the welding efficiency in the battery string repair process.

[0059] like Figures 1 to 8 As shown, the laser welding mechanism 10 of this application includes a mounting frame 1, n fiber-coupled lasers 2, n mounting bases 3, and n condenser lenses 4, wherein:

[0060] n mounting bases 3 are arranged side by side on the mounting frame 1 along a first direction (such as the X direction), and each mounting base 3 has a condenser lens 4 installed inside.

[0061] n fiber-coupled lasers 2 are mounted on the mounting frame 1. The fiber optic heads 21 of the n fiber-coupled lasers 2 are connected one-to-one with the n mounting bases 3. The light output of each fiber optic head 21 is opposite to the condenser lens 4 on the mounting base 3 to which it is connected, so that the laser emitted by each fiber-coupled laser 2 is transmitted to the condenser lens 4 on the corresponding mounting base 3 through the fiber optic head 21.

[0062] Condenser 4 is used to focus the received laser light before it is emitted.

[0063] Each mounting base 3 is configured to deflect relative to the mounting frame 1 to adjust the light output direction of the condenser lens 4;

[0064] n≥2.

[0065] The laser welding mechanism 10 provided in this application, by setting n fiber-coupled lasers 2 and their corresponding focusing lenses 4, enables simultaneous welding of n pairs of overlapping weld strips in a weld strip group, thereby improving the welding efficiency during battery string rework. For example, in the embodiment shown in the figure, n is 10, meaning that the laser welding mechanism 10 can simultaneously weld 10 pairs of overlapping weld strips in the weld strip group.

[0066] Of course, by setting n to be equal to the number of lap welds in the weld strip group, it is possible to weld all the lap welds in the weld strip group at the same time, thereby further improving welding efficiency.

[0067] Furthermore, since each mounting base 3 can be independently deflected to adjust the direction of the emitted light, it can be ensured that the emitted n laser beams can be aligned with the n overlapping parts to be welded one by one, so as to achieve synchronous and precise welding of the n overlapping parts and improve the welding quality.

[0068] The laser emitted by the fiber-coupled laser 2 for welding is generally an invisible infrared laser. To facilitate observation, a fluorescent sheet can be placed at the bottom of the mounting bracket before adjustment. After the infrared laser shines on the fluorescent sheet, the laser spot will appear. Then, adjust the deflection angle of each mounting base so that each laser spot is aligned with a straight line and the spacing meets the predetermined requirements. This allows it to be aligned with the n overlapping parts to be welded that are arranged at predetermined intervals on a straight line.

[0069] like Figures 4 to 8 As shown, in some embodiments, the mounting base 3 includes a first support 31, a first deflection seat 32, a first deflection adjustment component 33, and a connector 34. The first support 31 is fixed to the mounting frame 1, and a first light-emitting hole 35 is provided on the first support 31. The mounting frame 1 has a first through hole 39 communicating with the first light-emitting hole 35. The first deflection seat 32 is connected to the first support 31 via the first deflection adjustment component 33, which is used to adjust the deflection angle of the first deflection seat 32 relative to the first support 31. The first deflection seat 32 has a mounting hole 36 communicating with the first light-emitting hole 35, and the condenser lens 4 is disposed within the mounting hole 36. The connector 34 is disposed on the first deflection seat 32 and communicates with the mounting hole 36, and is used to connect to the fiber optic head 21. The laser emitted by the fiber-coupled laser 2 is transmitted through the fiber head 21 to the connector 34 and projected onto the condenser lens 4. After being focused by the condenser lens 4, the laser is emitted downward through the first light-emitting hole 35 and the first through hole 39.

[0070] Before welding the welding strip, the deflection angle of the first deflection seat 32 is adjusted by the first deflection adjustment component 33, thereby adjusting the light output direction of the condenser lens 4 installed in the first deflection seat 32. This ensures that the laser spots of each condenser lens 4 are on the same straight line and the spacing meets the requirements, thus ensuring that multiple spaced welding parts on the same straight line can be welded simultaneously and accurately during welding.

[0071] like Figures 6 to 8 As shown, in some embodiments, the first deflection adjustment component 33 includes:

[0072] At least three sets (e.g., four sets in the figure) of elastic members 37 are arranged circumferentially around the mounting hole 36 and the first light-emitting hole 35. The lower end of the elastic member 37 is connected to the first support 31, and the upper end of the elastic member 37 is connected to the first deflection seat 32. The elastic member 37 can extend and retract in the vertical direction.

[0073] At least three sets (e.g., four sets in the figure) of adjusting members 38 are arranged circumferentially around the mounting hole 36 and the first light-emitting hole 35. Each adjusting member 38 includes a screw 381 and a locking nut 382. The screw 381 is screwed vertically onto the first deflection seat 32. The lower end of the screw 381 extends downward through the first deflection seat 32 and abuts against the first support 31. The upper end of the screw 381 extends upward through the first deflection seat 32. The locking nut 382 is screwed onto the upper end of the screw 381 and presses against the upper surface of the first deflection seat 32.

[0074] When it is necessary to adjust the angle of the first deflection seat 32, loosen the locking nut 382, ​​tighten the screws 381, and adjust the extension of each screw 381 below the first deflection seat 32 to achieve the angle adjustment of the first deflection seat 32. After adjustment, tighten the locking nut 382. The elastic element 37 can pull the first deflection seat 32 toward the first support 31.

[0075] Therefore, when it is necessary to adjust the angle of the first deflection seat 32, one or more screws 381 can be screwed according to the adjustment target. After screwing them in place, the locking nut 382 can be tightened.

[0076] like Figure 8 As shown, in some embodiments, a support groove 311 is provided on the first support 31 at the position corresponding to the screw 381. The support groove 311 has a V-shaped structure and includes a first support inclined surface and a second support inclined surface arranged opposite to each other. The lower end of the screw 381 abuts against the first support inclined surface and the second support inclined surface of the support groove 311.

[0077] The lower end of the screw 381 simultaneously abuts against the first and second support ramps of the corresponding support groove 311, ensuring the stability of the support provided by the first support 31 to the screw 381. Furthermore, the screw 381 will not slip when the angle of the first deflection seat 32 is adjusted.

[0078] A support rod assembly can also be provided on the first support 31 at the position corresponding to the screw 381. The support rod assembly includes a first support rod 312 and a second support rod 313 arranged in parallel. The lower end of the screw 381 simultaneously abuts against the circumferential surface of the corresponding first support rod 312 and second support rod 313.

[0079] The lower end of the screw 381 simultaneously abuts against the circumferential surfaces of the corresponding first support rod 312 and second support rod 313, ensuring the stability of the support provided by the first support 31 to the screw 381. Furthermore, the screw 381 will not slip when the angle of the first deflection seat 32 is adjusted.

[0080] like Figure 8 As shown, in some embodiments, the lower end of the screw 381 is formed with a hemispherical abutment portion 383.

[0081] By setting the lower end of the screw 381 to a hemispherical shape, the friction between the screw 381 and the support groove 311, or between the screw 381 and the circumferential surfaces of the first support rod 312 and the second support rod 313, can be reduced, thereby reducing wear and extending the service life of the parts.

[0082] like Figure 8 As shown, in some embodiments, each set of adjusting members 38 includes a screw sleeve 384, which is fixedly inserted into the first deflection seat 32, and the screw is screwed onto the first deflection seat 32 via the screw sleeve 384.

[0083] like Figures 6 to 8 As shown, in some embodiments, the elastic element 37 includes a first limiting rod 371, a second limiting rod 372, and a tension spring 373, wherein: the first limiting rod 371 is disposed in the first support 31, the second limiting rod 372 is disposed in the first deflection seat 32, the lower end of the tension spring 373 is connected to the first limiting rod 371, and the upper end of the tension spring 373 is connected to the second limiting rod 372.

[0084] By configuring the elastic element 37 to include a first limiting rod 371, a second limiting rod 372, and a tension spring 373, a firm connection is ensured between the elastic element 37 and the first deflection seat 32 and the first support 31, and the installation and maintenance of the elastic element 37 are facilitated.

[0085] like Figure 2 As shown, in some embodiments, the laser welding mechanism 10 further includes a first moving part 5, and the mounting frame 1 is connected to the movable part of the first moving part 5. The first moving part 5 is used to drive the mounting frame 1 to translate and move up and down. By setting the first moving part 5, the translation and up and down adjustment of the mounting frame 1 are realized, thereby adjusting the n fiber-coupled lasers 2 and the corresponding n condenser lenses 4 to the target position close to the welding strip group to be welded, thereby ensuring that the welding strip group can be successfully welded.

[0086] In some embodiments, the first moving part 5 includes a translation drive module 51 and a lifting drive module 52, wherein the lifting drive module 52 is connected to a movable part of the translation drive module 51, and the mounting bracket 1 is connected to a movable part of the lifting drive module 52. The translation drive module 51 is used to drive the mounting bracket 1 to translate, and the lifting drive module 52 is used to drive the mounting bracket 1 to lift.

[0087] Both the translation drive module 51 and the lifting drive module 52 can adopt various existing linear drive modules, such as ball screw linear drive modules, synchronous belt linear drive modules, etc.

[0088] Considering that the adjustment range of the deflection angle of the mounting base 3 to the condenser lens 4 is limited, in order to ensure that the laser can be accurately projected onto the welding strip after deflection adjustment, it is necessary to pre-adjust the position of each mounting base 3 and then fine-tune the deflection angle of the corresponding condenser lens 4 through each mounting base 3.

[0089] Based on this consideration, such as Figure 2 As shown, in some embodiments, the mounting bracket 1 includes a first support 11, a second support 12, and a base 13, wherein: the first support 11 is connected to the movable part of the first moving part 5; the second support 12 is vertically arranged and connected to the first support 11, and the mounting angle of the second support 12 in the vertical plane is configured to be adjustable; the base 13 is horizontally arranged and connected to the second support 12, and the angle of the base 13 in the horizontal plane is configured to be adjustable; n fiber-coupled lasers 2 are arranged on the first support 11; and n mounting seats 3 are arranged on the base 13.

[0090] By configuring the mounting bracket 1 to consist of a first bracket 11, a second bracket 12 and a base 13, and configuring the base 13 to be able to rotate in the horizontal plane relative to the second bracket 12, and configuring the second bracket 12 to be able to rotate in the vertical plane relative to the first bracket 11, the position of each mounting seat 3 can be adjusted by adjusting the rotation angle of the base and the second bracket.

[0091] like Figure 2 and Figure 5 As shown, in some embodiments, the second bracket 12 is rotatably connected to the first bracket 11 via a horizontally arranged first rotating shaft 14. The second bracket 12 is provided with two first waist holes 15 located on both sides of the first rotating shaft 14, and the first waist holes 15 extend in a vertical direction. The first bracket 11 is provided with two first screw holes corresponding to the first waist holes 15. The first bolt passes through the first waist holes 15 and is screwed into the first screw holes. The laser welding mechanism 10 also includes a first set screw 17 and a first spring 18 arranged in a vertical direction and located on both sides of the first rotating shaft 14. The first set screw 17 is screwed to the first bracket 11 and its end abuts against the top of the second bracket 12. The upper end of the first spring 18 is connected to the first bracket 11, and the lower end of the first spring 18 is connected to the top of the second bracket 12.

[0092] When it is necessary to adjust the installation angle of the second bracket 12, first loosen the two first bolts so that the second bracket 12 can rotate around the first pivot 14.

[0093] According to the angle adjustment requirements of the second bracket 12, tighten the first set screw 17, specifically:

[0094] When the first set screw 17 is turned clockwise (e.g., clockwise), the first set screw 17 descends relative to the first bracket 11, thereby pushing the second bracket 12 downwards from its current position (e.g., to the left of the first rotating shaft 14), causing the second bracket 12 to rotate around the first rotating shaft 14. After the second bracket 12 has rotated to its final position, the turning of the first set screw 17 is stopped, and the two first bolts are retightened, so that the second bracket 12 is re-fixed to the first bracket 11.

[0095] When the first set screw 17 is turned clockwise (e.g., counterclockwise), the first set screw 17 rises relative to the first bracket 11. At the same time, the first spring 18, which is in a compressed state, pushes the second bracket 12 downward from its position (e.g., the right side of the first rotating shaft 14), thereby causing the second bracket 12 to rotate around the first rotating shaft 14. After the second bracket 12 has rotated to its position, stop turning the first set screw 17 and retighten the two first bolts, so that the second bracket 12 is fixed back to the first bracket 11.

[0096] In the two adjustment methods described above, the rotation direction of the second bracket 12 is opposite.

[0097] Continue to refer to Figure 2 and Figure 5 As shown, in some embodiments, the mounting bracket 1 further includes a base plate 19, which is horizontally arranged and connected to the second bracket 12. The base 13 is rotatably connected to the base plate 19 via a vertically arranged second rotating shaft 110. The base 13 is provided with two second waist holes 111 located on both sides of the second rotating shaft 110. The second waist holes 111 extend in the horizontal direction. The base plate 19 is provided with two second screw holes that correspond one-to-one with the second waist holes 111. The second bolt passes through the second waist holes 111 and is screwed into the second screw holes.

[0098] The laser welding mechanism 10 also includes a second set screw 113 and a second spring 114 arranged in the horizontal direction and located on both sides of the second rotating shaft 110. The second set screw 113 is screwed to the base plate 19 and its end abuts against the first side of the base 13. The first end of the second spring 114 is connected to the base plate 19 and the second end of the second spring 114 is connected to the first side of the base 13.

[0099] When it is necessary to adjust the installation angle of the base 13, first loosen the two second bolts so that the base 13 can rotate around the second pivot 110.

[0100] According to the angle adjustment requirements of the base 13, tighten the second set screw 113, specifically:

[0101] When the second set screw 113 is turned clockwise (e.g., clockwise), the second set screw 113 moves toward the base 13, thereby pushing the base 13 from its current position (e.g., to the left of the second pivot 110), causing the base 13 to rotate around the second pivot 110. After the base 13 has rotated to its final position, stop turning the second set screw 113 and retighten the two second bolts to re-fix the base 13 onto the base plate 19.

[0102] When the second set screw 113 is turned clockwise (e.g., counterclockwise), the second set screw 113 moves away from the base 13. At the same time, the second spring 114, which is in a compressed state, pushes the base 13 from its position (e.g., the right side of the second rotating shaft 110), causing the base 13 to rotate around the second rotating shaft 110. After the base 13 has rotated to its final position, stop turning the second set screw 113 and retighten the two second bolts to fix the base 13 back onto the base plate 19.

[0103] In the two adjustment methods described above, the rotation direction of the base 13 is opposite.

[0104] As mentioned earlier, the laser emitted by the fiber-coupled laser 2 for welding is generally an invisible infrared laser. After adjusting each laser spot to a straight line, the position of the laser welding mechanism needs to be calibrated during equipment debugging to ensure that it can be accurately moved to the overlapping part to be welded.

[0105] For ease of calibration, such as Figures 2 to 5 As shown, in some embodiments, the laser welding mechanism 10 of this application further includes two guide components 6 disposed on the mounting frame 1 and located on both sides of the n mounting seats 3 along the first direction.

[0106] The guiding component 6 includes a second support 61, a second deflection seat 62, a second deflection adjustment component 63, and a guiding light source 64. The second support 61 is fixedly mounted on the mounting frame 1, and the second support 61 is provided with a second light-emitting hole 65. The mounting frame 1 is provided with a second through hole 66 that communicates with the second light-emitting hole 65.

[0107] The second deflector 62 is rotatably connected to the second support 61 via the second deflection adjustment assembly 63. The second deflection adjustment assembly 63 is used to adjust the deflection angle of the second deflector 62 relative to the second support 61. The guide light source 64 is disposed on the second deflector 62. The guide light emitted by the guide light source 64 is emitted through the second light outlet 65 and the second through hole 66.

[0108] The guide light emitted by the guide light source 64 is visible light. First, the position of the second deflection seat is adjusted by the second deflection adjustment component so that the two guide lights coincide with the two laser spots located at the ends of a row of laser spots on the phosphor film. This indicates that the two guide lights are collinear with each laser spot. Subsequently, during mechanism calibration, only the two guide lights need to be turned on to accurately determine the position of the laser spots, thereby achieving accurate laser calibration.

[0109] In some embodiments, the second deflection adjustment assembly 63 includes: at least three sets of elastic connection assemblies 67 arranged circumferentially around the guide light source 64 and the second light emission hole 65, each elastic connection assembly 67 including a first screw 671 and a third spring 672, wherein the first screw 671 passes through the second deflection seat 62 and is screwed onto the second support 61, and the third spring 672 is sleeved on the first screw 671, with both ends of the third spring 672 abutting against the second support 61 and the second deflection seat 62 respectively; at least three second screws 68 arranged circumferentially around the guide light source 64 and the second light emission hole 65, each second screw 68 being screwed onto the second deflection seat 62, with the lower end of the second screw 68 extending downward through the second deflection seat 62 and abutting against the second support 61.

[0110] When it is necessary to adjust the angle of the second deflection seat 62, loosen the second screw 68 and adjust the screw length between each first screw 671 and the second support 61 to achieve the angle adjustment of the second deflection seat 62. After the adjustment is in place, tighten the second screw 68 to make it press against the second support 61.

[0111] Therefore, when it is necessary to adjust the deflection angle of the second deflection seat 62, one or more of the first screws 671 can be turned according to the adjustment target, and the second screw 61 can be used to position it after the adjustment is in place.

[0112] This application also provides a battery string repair device, see reference. Figure 1 and Figure 9 As shown, the battery string repair device of this application includes a repair platform 20, a welding strip clamping mechanism 30, and a laser welding mechanism 10 provided in any of the above embodiments. The repair platform 20 is used to carry the battery string to be repaired and the replacement battery cell 500 after the defective battery cell 300 has been removed.

[0113] Replacement cell 500 is located at the defective position in the battery string to be repaired. The defective position is the empty position after the defective cell 300 is removed.

[0114] Both the welding strip clamping mechanism 30 and the laser welding mechanism 10 are located above or on the side of the rework platform 20. The welding strip clamping device is configured to clamp the N first welding strips of the replacement battery cell 500 and the N second welding strips on the adjacent battery cell 400 in a one-to-one correspondence, so that the ends of the first welding strips overlap with the ends of the second welding strips to form N overlapping parts to be welded.

[0115] The laser welding mechanism 10 is configured to weld N overlapping parts, wherein the laser emitted by each fiber-coupled laser 2 is used to weld one overlapping part, and n≤N.

[0116] As can be seen, through the cooperation of the rework platform 20, the welding strip clamping mechanism 30, and the laser welding mechanism 10, the battery string rework device of this application realizes the automatic welding of replacement battery cells into the string. Because the laser welding mechanism 10 achieves precise welding of the N first welding strips of the replacement battery cell to the N overlapping parts of the N second welding strips on the adjacent battery cell, the rework quality of the battery string is improved. In particular, by setting n to be equal to N, the laser welding mechanism 10 can simultaneously weld all overlapping welding strips in the welding strip group in one operation, further improving rework efficiency.

[0117] like Figure 10 As shown, in some embodiments, the welding strip clamping mechanism 30 includes a second moving part (not shown), a connecting frame 301, a first moving frame 302, and a second moving frame 303, wherein: the connecting frame 301 is connected to the drive end of the second moving part, and the second moving part is configured to drive the connecting frame 301 to translate and move up and down. The first moving frame 302 and the second moving frame 303 are disposed opposite to each other on the connecting frame 301, and the first moving frame 302 and the second moving frame 303 are configured to move relative to each other.

[0118] The first movable frame 302 is provided with a plurality of first clamps 304, and the second movable frame 303 is provided with a plurality of second clamps 305 corresponding one-to-one with the first clamps 304. Each first clamp 304 and the corresponding second clamp 305 constitute a welding strip clamping assembly, and the welding strip clamping assembly is provided with welding clearance holes 306.

[0119] The laser emitted by each fiber-coupled laser 2 of the laser welding mechanism 10 welds the overlap of a pair of clamped first and second welding strips through a welding clearance hole 306.

[0120] The optional working process of the welding strip clamping mechanism 30 is as follows:

[0121] The second moving part drives the connecting frame 301 to move, so that each welding strip clamping assembly is located above a first welding strip and a second welding strip to be welded. At this time, the first chuck 304 and the second chuck 305 of each welding strip clamping assembly are in the open state.

[0122] Subsequently, the second moving part drives the connecting frame 301 to descend, so that each of the first and second welding strips to be welded enters between the first chuck 304 and the second chuck 305 of the corresponding welding strip holding assembly.

[0123] Subsequently, the first movable frame 302 and the second movable frame 303 are controlled to move relative to each other, thereby causing the first chuck 304 and the second chuck 305 of each welding strip clamping assembly to close, so as to clamp the corresponding first welding strip and the second welding strip, forming an overlap, and the overlap exposes the welding avoidance hole 306.

[0124] At this point, the clamping of the first and second weld strips to be welded is complete.

[0125] The laser welding mechanism 10 is controlled to move above the welding strip clamping mechanism 30. Through the aforementioned calibration, it can be ensured that after the laser welding mechanism moves into place, the laser emitted by each fiber-coupled laser 2 is aligned with the corresponding welding clearance hole 306. Welding is then carried out, and simultaneous and precise welding of n overlapping parts can be completed.

[0126] This application provides a sufficiently detailed and specific description. Those skilled in the art should understand that the descriptions in the embodiments are merely exemplary, and all changes made without departing from the true spirit and scope of this application should fall within its protection scope. The scope of protection claimed in this application is defined by the claims, not by the above descriptions in the embodiments. Without contradiction, some optional components in one embodiment can also be used in another embodiment, and some preferred structures of the same component in one embodiment are also applicable to another embodiment. Furthermore, there may be slight differences in the wording of the names of certain components in different embodiments; these slight differences will not affect the understanding of the technical solution of the present invention by those skilled in the art.

Claims

1. A laser welding mechanism, characterized in that, The laser welding mechanism includes a mounting frame, n fiber-coupled lasers, n mounting bases, and n focusing lenses, wherein: n mounting bases are arranged side by side on the mounting frame along a first direction, and each mounting base is equipped with a condenser lens. n fiber-coupled lasers are mounted on the mounting frame, and the fiber heads of the n fiber-coupled lasers are connected to the n mounting bases in a one-to-one correspondence. The light outlet of each fiber head is opposite to the condenser lens on the mounting base to which it is connected. The condenser lens is used to focus the received laser light before it is emitted. Each of the aforementioned mounting bases is configured to deflect relative to the mounting frame to adjust the light emission direction of the condenser lens; n≥2。 2. The laser welding mechanism as described in claim 1, characterized in that, The mounting base includes a first support, a first deflection seat, a first deflection adjustment assembly, and a connector, wherein: The first support is fixed on the mounting frame, and the first support is provided with a first light-emitting hole. The mounting frame is provided with a first through hole that communicates with the first light-emitting hole. The first deflection seat is connected to the first support via the first deflection adjustment component. The first deflection adjustment component is used to adjust the deflection angle of the first deflection seat relative to the first support. The first deflection seat is provided with a mounting hole that communicates with the first light-emitting hole. The condenser lens is disposed in the mounting hole. The connector is disposed on the first deflection seat and communicates with the mounting hole. The connector is used to connect with the optical fiber head. The laser beam focused by the condenser lens is emitted downward through the first light-emitting hole and the first through hole.

3. The laser welding mechanism as described in claim 2, characterized in that, The first deflection adjustment component includes: At least three sets of elastic elements are arranged circumferentially around the mounting hole and the first light-emitting hole. The lower end of the elastic element is connected to the first support, and the upper end of the elastic element is connected to the first deflection seat. The elastic element is capable of extending and retracting in the vertical direction. At least three sets of adjusting components are arranged circumferentially around the mounting hole and the first light-emitting hole. Each adjusting component includes a screw and a locking nut. The screw is vertically screwed onto the first deflection seat. The lower end of the screw extends downward through the first deflection seat and abuts against the first support. The upper end of the screw extends upward through the first deflection seat. The locking nut is screwed onto the upper end of the screw and presses against the upper surface of the first deflection seat.

4. The laser welding mechanism as described in claim 3, characterized in that: The first support is provided with support grooves corresponding to the screw rods one by one. Each support groove has a V-shaped structure and includes a first support inclined surface and a second support inclined surface arranged opposite each other. The lower end of the screw rod abuts against the first and second support inclined surfaces of the corresponding support grooves; or... The first support is provided with a set of support rods corresponding to the screw. The set of support rods includes a first support rod and a second support rod arranged in parallel. The lower end of the screw abuts against the circumferential surfaces of the corresponding first support rod and the second support rod.

5. The laser welding mechanism as described in claim 4, characterized in that, The lower end of the screw has a hemispherical abutment portion.

6. The laser welding mechanism as described in claim 3, characterized in that, The elastic element includes a first limiting rod, a second limiting rod, and a tension spring, wherein: The first limiting rod is disposed in the first support, the second limiting rod is disposed in the first deflection seat, the lower end of the tension spring is connected to the first limiting rod, and the upper end of the tension spring is connected to the second limiting rod.

7. The laser welding mechanism as described in any one of claims 1-6, characterized in that, The laser welding mechanism further includes a first movable part, and the mounting frame is connected to a movable component of the first movable part. The first movable part is used to drive the mounting frame to translate and move up and down. The mounting frame includes a first bracket, a second bracket, and a base, wherein: The first bracket is connected to the movable part of the first movable part; The second bracket is vertically mounted and connected to the first bracket, and the installation angle of the second bracket in the vertical plane is configured to be adjustable; The base is horizontally positioned and connected to the second bracket, and the angle of the base in the horizontal plane is configured to be adjustable. n fiber-coupled lasers are mounted on the first support; n mounting bases are disposed on the base.

8. The laser welding mechanism as described in claim 7, characterized in that: The second bracket is rotatably connected to the first bracket via a horizontally set first rotating shaft. The second bracket is provided with two first waist holes located on both sides of the first rotating shaft. The first waist holes extend in the vertical direction. The first bracket is provided with two first screw holes that correspond one-to-one with the first waist holes. The first bolt passes through the first waist hole and is screwed into the first screw hole. The laser welding mechanism further includes a first set screw and a first spring arranged vertically on both sides of the first rotating shaft. The first set screw is screwed to the first bracket and its end abuts against the top of the second bracket. The upper end of the first spring is connected to the first bracket, and the lower end of the first spring is connected to the top of the second bracket.

9. The laser welding mechanism as described in claim 7, characterized in that: The mounting bracket also includes a base plate, which is horizontally set and connected to the second bracket. The base is rotatably connected to the base plate via a vertically set second rotating shaft. The base is provided with two second waist holes located on both sides of the second rotating shaft. The second waist holes extend in the horizontal direction. The base plate is provided with two second screw holes that correspond one-to-one with the second waist holes. The second bolt passes through the second waist holes and is screwed into the second screw holes. The laser welding mechanism further includes a second set screw and a second spring arranged horizontally and located on both sides of the second rotating shaft. The second set screw is screwed to the base plate and its end abuts against the first side of the base. The first end of the second spring is connected to the base plate, and the second end of the second spring is connected to the first side of the base.

10. The laser welding mechanism as described in claim 1, characterized in that, The laser welding mechanism further includes two guide assemblies disposed on the mounting bracket and located on both sides of the n mounting seats along the first direction. Each guide assembly includes a second support, a second deflection seat, a second deflection adjustment assembly, and a guide light source, wherein: The second support is fixedly mounted on the mounting frame, and the second support is provided with a second light-emitting hole. The mounting frame is provided with a second through hole that communicates with the second light-emitting hole. The second deflection seat is rotatably and adjustablely connected to the second support via the second deflection adjustment component. The second deflection adjustment component is used to adjust the deflection angle of the second deflection seat relative to the second support. The guide light source is disposed on the second deflection seat. The guiding light emitted by the guiding light source is emitted through the second light-emitting hole and the second through hole.

11. The laser welding mechanism as described in claim 10, characterized in that, The second deflection adjustment component includes: At least three sets of elastic connection components are arranged circumferentially around the guide light source and the second light outlet hole. Each elastic connection component includes a first screw and a third spring. The first screw passes through the second deflection seat and is screwed onto the second support. The third spring is sleeved on the first screw, and the two ends of the third spring abut against the second support and the second deflection seat, respectively. At least three second screws are arranged circumferentially around the guide light source and the second light outlet hole. The second screws are screwed onto the second deflection seat, and the lower end of the second screws extends downward through the second deflection seat and abuts against the second support.

12. A battery string repair device, characterized in that, The battery string repair device includes a repair platform, a welding strip clamping mechanism, and a laser welding mechanism as described in any one of claims 1 to 11, characterized in that... The rework platform is used to carry the battery string to be reworked and the replacement battery after the defective battery cell has been removed. The replacement battery is located at the defect location in the battery string to be reworked. The defect location is the position vacated after the defective battery cell is removed. Both the welding strip clamping mechanism and the laser welding mechanism are located above or on the side of the rework platform. The welding strip clamping device is configured to clamp the N first welding strips of the replacement battery cell and the N second welding strips on the adjacent battery cell in a one-to-one correspondence, so that the ends of the first welding strips overlap with the ends of the second welding strips to form N overlapping parts to be welded. The laser welding mechanism is configured to weld N overlapping parts, wherein the laser emitted by each fiber-coupled laser is used to weld one overlapping part, and n≤N.

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