Battery string disassembly device and disassembly method

Abstract

The application provides a battery string disassembling device and a disassembling method, wherein the battery string disassembling device comprises a disassembling platform and a laser disbonding mechanism, wherein: the disassembling platform is configured to carry a battery string to be disassembled, and the battery string contains a defective battery piece to be disassembled; the laser disbonding mechanism is configured to disbond the first welding strip on the upper surface of the defective battery piece from the defective battery piece and / or disbond the second welding strip on the lower surface of the defective battery piece from the adjacent battery piece; and the disassembling platform is further configured to drive the battery pieces located on one side or both sides of the defective battery piece to move away from the defective battery piece, so as to disassemble the defective battery piece with the second welding strip on the lower surface. The battery string disassembling device of the application disassembles the defective battery piece and the second welding strip connected to the lower surface of the defective battery piece from the battery string. In this way, when the welding replacement battery piece is welded, the welding strips are all stacked on the corresponding battery piece from the upper side, and it is not necessary to stack the welding strip on the lower side of the battery piece, thereby improving the efficiency of the battery string repair.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing, specifically to a battery string disassembly device and disassembly method. Background Technology

[0002] Because the solar cells are thin and brittle, defects such as microcracks, missing edges, and chipped corners may occur during the process of connecting them into a battery string. In this case, it is necessary to remove the defective solar cells from the battery string and weld the replacement solar cells to the location of the defective solar cells.

[0003] For battery strings with solder strips welded to both the upper and lower surfaces, the traditional disassembly method involves heating the defective battery cell using a light box to simultaneously desolder the defective cell and its solder strips on both surfaces. After desoldering, the desoldered solder strips on the upper surface (referred to as solder strip one) and the desoldered solder strips on the lower surface (referred to as solder strip two) of the defective battery cell are pulled apart to the sides, separating solder strip one and solder strip two from the defective battery cell. After disassembly, solder strip one and solder strip two are then welded to the upper and lower surfaces of the replacement battery cell, respectively.

[0004] Before welding ribbon one and welding ribbon two to the upper and lower surfaces of the replacement cell, welding ribbon two needs to be laid out at the welding position, then the replacement cell is stacked on welding ribbon two, and then welding ribbon one is laid out on the upper surface of the replacement cell.

[0005] When the first welding strip is pulled and stacked on the upper surface of the replacement cell, it can be easily and quickly covered with the welding points on the upper surface of the replacement cell because the operation can be performed from the top. However, when the second welding strip is pulled and laid at the welding position, in order to ensure that the second welding strip accurately covers the welding points on the lower surface of the replacement cell after it is stacked on top of the second welding strip, it often takes a certain amount of time and a special welding strip adjustment mechanism to adjust the placement of the second welding strip. This reduces the rework efficiency of the battery string and increases the structural complexity of the disassembly device. Summary of the Invention

[0006] To address the aforementioned technical problems of traditional disassembly methods, this invention provides a battery string disassembly device, the detailed technical solution of which is as follows:

[0007] A battery string disassembly device includes a disassembly platform and a laser desoldering mechanism, wherein:

[0008] The disassembly platform is configured to carry the battery strings to be disassembled, which contain defective battery cells that need to be removed from the battery strings.

[0009] The laser desoldering mechanism is configured to use a laser beam to desolder the weld points between the first weld strip on the upper surface of the defective solar cell and the defective solar cell, and / or to desolder the weld points between the second weld strip on the lower surface of the defective solar cell and the adjacent solar cell.

[0010] The disassembly platform is also configured to move cells located on one or both sides of the defective cell away from the defective cell in order to disassemble the defective cell with at least a second solder strip on its lower surface.

[0011] By combining a disassembly platform and a laser desoldering mechanism, the battery string disassembly device provided by this invention disassembles defective battery cells by desoldering only the weld strips on the upper surface of the battery string. Specifically, the defective battery cell is desoldered and separated from the first weld strip on its upper surface, and then the second weld strip connected to the lower surface of the defective battery cell is desoldered and separated from the adjacent battery cell. This allows the defective battery cell and the second weld strip connected to its lower surface to be disassembled together from the battery string. Since the desoldered weld strips are all located on the upper surface of the battery string, when welding replacement battery cells, the welding positions of the weld strips are also all located on the upper surface of the battery string. Therefore, the weld strips can be pulled and stacked onto the corresponding battery cells from the top of the battery string, avoiding the need to stack weld strips on the lower surface of the replacement battery cells. This eliminates the need for a weld strip adjustment mechanism, thereby improving the rework efficiency of the battery string and simplifying the structure of the disassembly device.

[0012] In particular, the battery string disassembly device provided by the present invention uses a laser beam to desolder the solder strip. Compared with the traditional light box desoldering method, the heat of the laser beam is controllable. On the one hand, it can desolder the solder strip on the upper surface of the adjacent battery cell without desoldering the solder strip on the lower surface of the adjacent battery cell, thereby avoiding secondary welding between the solder strip on the lower surface of the adjacent battery cell and the adjacent battery cell, and thus avoiding the occurrence of cold solder joints. On the other hand, it can also effectively reduce the thermal deformation of the battery cell.

[0013] In some embodiments, the laser desoldering mechanism includes a laser generator, a galvanometer assembly, and a field lens, wherein: the laser generator emits a laser beam toward the galvanometer assembly; the galvanometer assembly reflects the laser beam to the field lens; the field lens focuses the laser beam and projects it onto each welding point on the upper surface of the defective solar cell, thereby desoldering the first solder strip from the defective solar cell, and / or focuses the laser beam and projects it onto each welding point on the upper surface of an adjacent solar cell, thereby desoldering the second solder strip from the adjacent solar cell.

[0014] A simple laser desoldering mechanism is provided, which uses the cooperation of a galvanometer assembly and a field lens to precisely focus and project the laser beam emitted by the laser generator onto the target welding point, thereby performing precise desoldering of the weld strip at the target welding point. Compared with the traditional light box heating of the entire surface of the battery cell, the heated area of ​​the battery cell is small, which can reduce the deformation of the battery cell.

[0015] In some embodiments, the laser desoldering mechanism further includes a transverse module and a mounting base connected to the movable end of the transverse module. The laser generator, galvanometer assembly, and field lens are all mounted on the mounting base. The transverse module is used to drive the mounting base to translate so that the field lens moves to above the defective cell and / or above the adjacent cell. The field lens focuses the laser beam and projects it sequentially onto each row of welding points on the upper surface of the defective cell that is perpendicular to the stringing direction of the cell string, and / or focuses the laser beam and projects it sequentially onto each row of welding points on the upper surface of the adjacent cell that is perpendicular to the stringing direction of the cell string.

[0016] By setting up a transverse module, the laser generator, galvanometer assembly, and field lens can be driven to translate along the string direction of the battery string. This allows the galvanometer assembly and field lens to focus the laser beam and project it sequentially onto each row of target welding points on the defective battery cell and / or adjacent cells, thereby completing the precise desoldering of the weld strips at each row of target welding points and improving the desoldering efficiency.

[0017] In some embodiments, the battery string disassembly apparatus further includes a solder strip separation mechanism configured to separate a first solder strip at a corresponding solder joint from the upper surface of the defective battery cell after the solder joint is desoldered, and / or to separate a second solder strip at a corresponding solder joint from the upper surface of an adjacent battery cell after the solder joint is desoldered.

[0018] By setting up a solder strip separation mechanism, the solder strip and the battery cell at the welding point where the welding has been completed can be separated in a timely manner, preventing the solder strip and the battery cell from sticking together and solidifying again, thereby ensuring the welding effect.

[0019] In some embodiments, the solder strip separation mechanism includes a moving mechanism and a separation plate connected to the drive end of the moving mechanism, the length direction of the separation plate being perpendicular to the stringing direction of the battery string; the laser desoldering mechanism is configured to desolder each row of solder points on the upper surface of the defective battery cell that are perpendicular to the stringing direction of the battery string, row by row; the moving mechanism is configured to insert the separation plate into the gap between the first solder strip and the upper surface of the defective battery cell, and drive the separation plate to translate above the defective battery cell along the stringing direction parallel to the battery string, so as to desolder each row of solder points. The first weld strip at the corresponding row of weld points is then separated from the upper surface of the defective battery cell; and / or the laser desoldering mechanism is configured to desolder each row of weld points on the upper surface of the adjacent battery cell, perpendicular to the stringing direction of the battery string, row by row; the moving mechanism is configured to insert the separating plate into the gap between the second weld strip and the upper surface of the adjacent battery cell, and drive the separating plate to translate above the adjacent battery cell along the stringing direction parallel to the battery string, so as to separate the second weld strip at the corresponding row of weld points from the upper surface of the adjacent battery cell after each row of weld points is desoldered.

[0020] By setting up a strip separation mechanism, during the process of disassembling each row of weld points on defective or adjacent solar cells, the laser desoldering mechanism separates the strip from the solar cell after each row of weld points is desoldered, thereby improving the disassembly efficiency of the solar cells.

[0021] In some embodiments, the moving mechanism includes a first translation module, a second translation module, and a lifting module, wherein: the second translation module is connected to the moving end of the first translation module, the lifting module is connected to the moving end of the second translation module, and the separating piece is connected to the moving end of the lifting module; the lifting module is used to drive the separating piece to move up and down; the second translation module is used to drive the separating piece to translate along a second horizontal direction, the second horizontal direction being perpendicular to the stringing direction of the battery string; the first translation module is used to drive the separating piece to translate along a first horizontal direction, the first horizontal direction being parallel to the stringing direction of the battery string.

[0022] Driven by the combined action of the first translation module, the second translation module, and the lifting module, the separating plate can be smoothly inserted into the gap between the first solder strip and the upper surface of the defective battery cell, or between the second solder strip and the upper surface of the adjacent battery cell, and move along the stringing direction parallel to the battery string, thereby separating the solder strip and the battery cell at the unsoldered solder joint.

[0023] In some embodiments, the disassembly platform includes a mounting base, an intermediate support platform, a first side support platform, and a second side support platform, wherein: the intermediate support platform is fixedly mounted on the mounting base; the first side support platform is movably connected to the mounting base and located on the first side of the intermediate support platform; the first side support platform is configured to be able to translate toward or away from the intermediate support platform and to move up and down in the vertical direction; the second side support platform is movably connected to the mounting base and located on the second side of the intermediate support platform; the second side support platform is configured to be able to translate toward or away from the intermediate support platform and to move up and down in the vertical direction; the intermediate support platform is used to carry defective solar cells; the first side support platform is used to carry solar cells located on the first side of the defective solar cells; and the second side support platform is used to carry solar cells located on the second side of the defective solar cells.

[0024] By setting the disassembly platform to include a central support platform, and a first side support platform and a second side support platform that can be translated and lifted relative to the central support platform, the disassembly platform can work with the laser desoldering mechanism to automatically disassemble defective battery cells from the battery string.

[0025] In some embodiments, the bearing surface of the intermediate bearing platform is provided with adsorption holes, and the bearing surface adsorbs defective battery cells through the adsorption holes; the end of the first side bearing platform near the intermediate bearing platform is provided with a first side adsorption plate, which is used to support and adsorb adjacent battery cells located on the first side of the defective battery cell; the end of the second side bearing platform near the intermediate bearing platform is provided with a second side adsorption plate, which is used to support and adsorb adjacent battery cells located on the second side of the defective battery cell.

[0026] The intermediate support platform, the first side adsorption plate of the first side support platform, and the second side adsorption plate of the second side support platform respectively adsorb the defective battery cell and the adjacent battery cells located on the first and second sides of the defective battery cell, thereby preventing the battery cell from moving during the disassembly platform movement and ensuring the smooth implementation of the disassembly process.

[0027] In some embodiments, the battery string disassembly apparatus further includes a cell feeding mechanism and a solder ribbon traction mechanism, wherein: the cell feeding mechanism is configured to feed a replacement cell with a third solder ribbon welded to at least its lower surface onto the disassembly platform to replace a removed defective cell with a second solder ribbon on its lower surface; the solder ribbon traction mechanism is configured to traction and stack a first solder ribbon onto the upper surface of the replacement cell, and / or traction and stack a third solder ribbon onto the upper surface of an adjacent cell; the laser desoldering mechanism is further configured to weld the first solder ribbon onto the upper surface of the replacement cell, and / or weld the third solder ribbon onto the upper surface of an adjacent cell.

[0028] With the cooperation of the cell feeding mechanism, the ribbon traction mechanism and the laser desoldering mechanism, the battery string disassembly device of the present invention can also automatically weld replacement cells to the empty positions after the defective cells are disassembled, thereby completing the rework of the battery string. The laser welding method can also reduce the deformation of the cells during the welding process, and the connection between the cells and the ribbons on the lower surface is not affected when welding the ribbons on the upper surface of the cells.

[0029] In some embodiments, the battery string disassembly device further includes a soldering mechanism disposed on the side of the disassembly platform or the battery cell feeding mechanism. The soldering mechanism is used to apply solder to the upper surface of the replacement battery cell. The replacement battery cell provided by the battery cell feeding mechanism is a battery cell with solder dots printed on its upper surface.

[0030] By using a soldering mechanism to solder the upper surface of the replacement battery cell, or by directly using a replacement battery cell with solder dots printed on its upper surface, the first solder strip on the adjacent battery cell after desoldering can be successfully soldered together with the replacement battery cell, thus ensuring the quality of the rework soldering.

[0031] The present invention also provides a method for disassembling a battery string, comprising:

[0032] Identify defective cells in a battery string;

[0033] A laser beam is used to irradiate each welding point on the upper surface of the defective solar cell to desolder and separate the first weld strip connected to the upper surface of the defective solar cell from the defective solar cell; and / or, a laser beam is used to irradiate each welding point on the upper surface of an adjacent solar cell adjacent to the defective solar cell to desolder and separate the second weld strip connected to the lower surface of the defective solar cell from the adjacent solar cell, so as to disassemble the defective solar cell with at least the second weld strip on the lower surface.

[0034] The battery string disassembly method provided by this invention disassembles defective battery cells by only unsoldering the solder strips on the upper surface of the battery string. Specifically, the defective battery cell is unsoldered and separated from the first solder strip on its upper surface, and then the second solder strip connected to the lower surface of the defective battery cell is unsoldered and separated from the adjacent battery cell. This allows the defective battery cell and the second solder strip connected to its lower surface to be disassembled together from the battery string. Since the unsoldered solder strips are all located on the upper surface of the battery string, when welding replacement battery cells, the welding positions of the solder strips are also all located on the upper surface of the battery string. Therefore, the solder strips can be pulled and stacked onto the corresponding battery cells from the top of the battery string, avoiding the need to stack solder strips on the lower surface of the replacement battery cells, thereby improving the rework efficiency of the battery string.

[0035] In particular, the battery string disassembly method provided by this invention uses a laser beam to desolder the solder strips. Compared with the traditional light box desoldering method, the heat of the laser beam is controllable. On the one hand, it can desolder the solder strips on the upper surface of adjacent battery cells without desoldering the solder strips on the lower surface of adjacent battery cells, thereby avoiding secondary welding between the solder strips on the lower surface of adjacent battery cells and adjacent battery cells, and thus avoiding the occurrence of cold solder joints. On the other hand, it can also effectively reduce the thermal deformation of battery cells.

[0036] In some embodiments, irradiating the weld points on the upper surface of the defective battery cell with a laser beam includes: controlling the laser beam to be sequentially projected onto each row of weld points on the upper surface of the defective battery cell that is perpendicular to the stringing direction of the battery string, so that the same row of weld points perpendicular to the stringing direction of the battery string can be desoldered simultaneously; and / or, irradiating the weld points on the upper surface of an adjacent battery cell adjacent to the defective battery cell with a laser beam includes: controlling the laser beam to be sequentially projected onto each row of weld points on the upper surface of the adjacent battery cell that is perpendicular to the stringing direction of the battery string, so that the same row of weld points perpendicular to the stringing direction of the battery string can be desoldered simultaneously.

[0037] The laser beam sequentially illuminates each row of welding points on the defective solar cell and / or adjacent cells, thereby completing the precise desoldering of the weld strips at each row of welding points and improving desoldering efficiency.

[0038] In some embodiments, after the laser beam irradiates the welding points on the upper surface of the defective battery cell, the battery string disassembly method of the present invention further includes: separating the first weld strip at the corresponding welding point from the defective battery cell within a predetermined time period; and / or, after the laser beam irradiates the welding points on the upper surface of the adjacent battery cell, the battery string disassembly method of the present invention further includes: separating the second weld strip at the corresponding welding point from the adjacent battery cell within a predetermined time period.

[0039] Separating the solder strip and battery cell at the weld point after desoldering in a timely manner can prevent the solder strip and battery cell from sticking and hardening again, thus ensuring the desoldering effect.

[0040] In some embodiments, after disassembling the defective battery cell with at least a second solder strip on its lower surface, the battery string disassembly method of the present invention further includes: loading a replacement battery cell with at least a third solder strip welded to its lower surface onto the position of the original defective battery cell, and pulling and stacking the first solder strip onto a designated position on the upper surface of the replacement battery cell, and / or pulling and stacking the third solder strip onto a designated position on the upper surface of an adjacent battery cell; and using a laser to weld the first solder strip to the upper surface of the replacement battery cell, and / or to weld the third solder strip to the upper surface of an adjacent battery cell.

[0041] The battery string was repaired by automatically welding replacement cells to the empty positions left after the defective cells were disassembled. Laser welding was used during the welding process, which reduced the deformation of the cells and did not affect the connection between the cells and the lower surface weld strips when welding the upper surface of the cells. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the battery string disassembly device according to an embodiment of the present invention;

[0043] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0044] Figure 3 This is a schematic diagram of the welding strip separation mechanism in an embodiment of the present invention;

[0045] Figure 4 This is a schematic diagram of the structure of the separation plate in an embodiment of the present invention;

[0046] Figure 5 This is a flowchart illustrating the battery string disassembly method in an embodiment of the present invention.

[0047] Figure 6 This is a schematic diagram of the structure of the battery string to be disassembled;

[0048] Figures 1 to 6 The following reference numerals are included:

[0049] Disassembly Platform 10:

[0050] Mounting base 11, intermediate support platform 12, first side support platform 13, second side support platform 14, first side adsorption plate 131, second side adsorption plate 141;

[0051] Laser desoldering mechanism 20:

[0052] Laser generator 21, field lens 22, transverse shift module 23, mounting base 24;

[0053] Welding strip separation mechanism 30:

[0054] The moving mechanism 31, the separating plate 32, the first translation module 311, the second translation module 312, the lifting module 313, the first side guide slope 321, and the second side guide slope 322.

[0055] Battery string 100 to be disassembled: head battery cell 101, tail battery cell 102, middle battery cell 103, head solder strip 104, tail solder strip 105. Detailed Implementation

[0056] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] This invention provides a battery string disassembly device and method. When disassembling defective battery cells, the solder strips on the lower surface of the defective battery cells are not unsoldered; that is, the defective battery cell and the solder strips on its lower surface are disassembled together from the battery string. Thus, when welding replacement battery cells, the solder strips are stacked onto the corresponding battery cells from the top, without laying solder strips on the lower side of the battery cells, thereby improving the rework efficiency of the battery string and simplifying the structure of the disassembly device.

[0058] like Figure 1 As shown, the battery string disassembly device provided in this embodiment of the invention includes a disassembly platform 10 and a laser desoldering mechanism 20, wherein:

[0059] The disassembly platform 10 is configured to carry the battery string to be disassembled, which contains defective battery cells that need to be removed from the battery string.

[0060] The laser desoldering mechanism 20 is configured to use a laser beam to desolder the weld points between the first weld strip on the upper surface of the defective cell and the defective cell, and / or to desolder the weld points between the second weld strip on the lower surface of the defective cell and the adjacent cell.

[0061] like Figure 6As shown, a schematic diagram of the structure of the battery string 100 to be disassembled is presented. The defective battery cell may be the head battery cell 101 located at the beginning of the string, the tail battery cell 102 located at the end of the string, or the middle battery cell 103 located in the middle of the string. Depending on the location of the defective battery cell, the specific desoldering process of the laser desoldering mechanism 20 on the defective battery cell is as follows:

[0062] When the defective cell is the head cell at the beginning of the string, the laser desoldering mechanism 20 desolders the defective cell by using a laser beam to desolder the welding points between the second weld strip connected to the lower surface of the defective cell and the adjacent cells. That is, in this case, the first weld strip connected to the upper surface of the defective cell (i.e., the head weld strip 104 of the battery string) and the second weld strip connected to the lower surface of the defective cell are disassembled from the battery string along with the defective cell.

[0063] When the defective cell is the tail cell of the string, the laser desoldering mechanism 20 desolders the defective cell by using a laser beam to desolder each weld point between the first weld strip connected to the upper surface of the defective cell and the defective cell. That is, in this case, the second weld strip connected to the lower surface of the defective cell (i.e., the tail weld strip 105 of the battery string) is removed from the battery string along with the defective cell.

[0064] When the defective solar cell is a cell in a string, the laser desoldering mechanism 20 performs the following desoldering process: It uses a laser beam to desolder the weld points between the first weld strip on the upper surface of the defective solar cell and the defective solar cell; and it desolders the weld points between the second weld strip on the lower surface of the defective solar cell and adjacent solar cells. In other words, in this case, the second weld strip connected to the lower surface of the defective solar cell is removed from the battery string along with the defective solar cell.

[0065] In traditional lightbox desoldering, the high heat of the lightbox causes the solder strips on both the upper and lower surfaces of the battery cell to desolder simultaneously. This application uses a laser beam to desolder the solder strips. Compared to traditional lightbox desoldering, the heat of the laser beam is controllable, allowing for desoldering of the solder strips on the upper surface of the battery cell without desoldering the solder strips on the lower surface. Especially when desoldering adjacent battery cells and a second solder strip, it prevents the solder strips on the lower surface of the adjacent battery cell from desoldering with the adjacent battery cell, thus preventing secondary welding between the solder strips on the lower surface of the adjacent battery cell and the adjacent battery cell, ensuring the quality of the reworked battery string.

[0066] The disassembly platform 10 is also configured to move cells located on one or both sides of the defective cell away from the defective cell, in order to disassemble the defective cell with at least a second weld strip on its lower surface. Depending on the location of the defective cell, the specific process by which the disassembly platform 10 disassembles the defective cell is as follows:

[0067] When the defective cell is the head cell at the beginning of the string, the disassembly platform 10 moves all the cells on the second side (i.e. the rear side) of the defective cell away from the defective cell, thereby disassembling the defective cell with the first solder strip on the upper surface (i.e. the head solder strip of the battery string) and the second solder strip on the lower surface from the battery string.

[0068] When the defective cell is the tail cell at the end of the string, the disassembly platform 10 moves all the cells on the first side (i.e. the front side) of the defective cell away from the defective cell, thereby disassembling the defective cell with the second solder strip (i.e. the tail solder strip of the battery string) from the battery string.

[0069] When the defective cell is a cell in a string, the disassembly platform 10 moves the cells on both sides of the defective cell away from the defective cell, thereby disassembling the defective cell with the second solder strip on its lower surface from the battery string.

[0070] As can be seen, through the final disassembly of the disassembly platform, the defective battery cell and the second weld strip attached to its lower surface are removed together from the battery string. Therefore, when subsequently welding replacement battery cells, it is unnecessary to lay the weld strip on the lower surface of the battery cell. Specifically, depending on the location of the defective battery cell in the disassembled battery string, the welding process for replacing the battery cell is as follows:

[0071] When the defective cell in the disassembled battery string is the head cell located at the beginning of the string, the replacement cell is a cell with a third solder strip welded to its lower surface and a fourth solder strip welded to its upper surface (the new head solder strip). The welding process for the replacement cell is as follows:

[0072] Place the replacement cell in the empty position (i.e., the beginning of the string) after the defective cell has been removed. Pull the third solder strip on the lower surface of the replacement cell from the top of the string and stack it on the upper surface of the adjacent cell. Finally, weld the third solder strip onto the upper surface of the adjacent cell.

[0073] When the defective cell in the battery string is identified as the tail cell, the replacement cell is a cell with a third solder strip (new tail solder strip) welded to its lower surface. The welding process for the replacement cell is as follows:

[0074] Place the replacement cell in the empty position (i.e., the end of the string) after the defective cell has been removed. Pull the first solder strip connected to the lower surface of the adjacent cell from the top of the string and stack it onto the upper surface of the replacement cell. Finally, weld the first solder strip onto the upper surface of the replacement cell.

[0075] When the defective cell in the battery string is identified during disassembly, the replacement cell is a cell with a third solder strip welded to its lower surface. The welding process for the replacement cell is as follows:

[0076] The replacement cell is placed in the empty space left by the removal of the defective cell. The first weld strip on the lower surface of the adjacent cell on the first side of the replacement cell is pulled from the top of the cell string and stacked onto the upper surface of the replacement cell. Simultaneously, the third weld strip on the lower surface of the replacement cell is pulled from the top of the cell string and stacked onto the upper surface of the adjacent cell on the second side of the replacement cell. Finally, the first weld strip is welded to the upper surface of the replacement cell, and the third weld strip is welded to the upper surface of the adjacent cell on the second side.

[0077] It is evident that regardless of the location of the defective cell in the disassembled battery string, the solder strip can be stacked from the top of the battery string and soldered onto the replacement cell or adjacent cell during the welding replacement process. This operation is easy and significantly improves the rework efficiency of the battery string.

[0078] like Figure 1 and Figure 2 As shown, optionally, the laser desoldering mechanism 20 includes a laser generator 21, a galvanometer assembly, and a field lens 22, wherein:

[0079] The laser generator 21 emits a laser beam toward the galvanometer assembly, which then reflects the laser beam to the field mirror 22.

[0080] Field lens 22 focuses the laser beam and projects it onto each welding point on the upper surface of the defective solar cell, thereby desoldering the first weld strip from the defective solar cell, and / or focuses the laser beam and projects it onto each welding point on the upper surface of an adjacent solar cell, thereby desoldering the second weld strip from the adjacent solar cell.

[0081] Depending on the location of the defective solar cell, the specific desoldering process of the laser desoldering mechanism 20 for the defective solar cell is as follows:

[0082] When the defective cell is the head cell at the beginning of the string, the laser desoldering mechanism 20 desolders the defective cell as follows: the field lens 22 focuses the laser beam and projects it onto each welding point on the upper surface of the adjacent cell, thereby desoldering the second weld strip connected to the lower surface of the defective cell to the adjacent cell.

[0083] When the defective cell is the tail cell at the end of the string, the laser desoldering mechanism 20 desolders the defective cell as follows: the field lens 22 focuses the laser beam and projects it onto each welding point on the upper surface of the defective cell, thereby desoldering the first weld strip connected to the upper surface of the defective cell from the defective cell.

[0084] When the defective solar cell is a cell in a series, the laser desoldering mechanism 20 performs the following desoldering process on the defective solar cell: the field lens 22 focuses the laser beam and projects it onto each welding point on the upper surface of the defective solar cell, thereby desoldering the first weld strip connected to the upper surface of the defective solar cell from the defective solar cell; the field lens 22 focuses the laser beam and projects it onto each welding point on the upper surface of the adjacent solar cell, thereby desoldering the second weld strip connected to the lower surface of the defective solar cell from the adjacent solar cell.

[0085] In traditional lightbox welding, the entire surface of the solar cell is heated, resulting in a large heated area and potential deformation. Compared to traditional lightbox welding, this application utilizes the cooperation of the galvanometer assembly and field lens 22 to precisely focus and project the laser beam emitted by the laser generator 21 onto the target welding point. This allows for precise welding of the strip at the target welding point, effectively reducing the heated area of ​​the solar cell and minimizing or even eliminating deformation.

[0086] Continue to refer to Figure 1 As shown, optionally, the laser desoldering mechanism 20 also includes a traversing module 23 and a mounting base 24 connected to the moving end of the traversing module 23. The laser generator 21, galvanometer assembly, and field lens 22 are all mounted on the mounting base 23. Depending on the location of the defective solar cell, the traversing module 23 drives the mounting base 23 to move stepwise, thereby moving the field lens 22 above the defective solar cell and / or above adjacent solar cells, to perform precise desoldering of the solder strips at the corresponding location.

[0087] Under the control of the galvanometer assembly, the field lens 22 focuses the laser beam and projects it sequentially onto each row of welding points on the upper surface of the defective cell that are perpendicular to the stringing direction of the cell string, and / or focuses the laser beam and projects it sequentially onto each row of welding points on the upper surface of the adjacent cell that are perpendicular to the stringing direction of the cell string.

[0088] That is, the field lens 22 focuses the laser beam to cover a row of welding points at once. Under the control of the galvanometer assembly, the laser beam is projected onto each row of welding points in sequence. The number of welding points in each row is equal to the number of solder ribbons on the surface of the solar cell. When the laser beam is projected onto a row of welding points, all solder ribbons on that row can be simultaneously de-welded. After each row of welding points has been projected in sequence, all solder ribbons on the surface of the solar cell can be de-welded to the solar cell, ultimately improving the de-welding efficiency.

[0089] Optional, such as Figure 1As shown, the battery string disassembly device of the present invention further includes a solder strip separation mechanism 30. Depending on the location of the defective battery cell, the solder strip separation mechanism 30 is configured to separate the first solder strip at the corresponding solder point from the upper surface of the defective battery cell after the solder point is desoldered, and / or to separate the second solder strip at the corresponding solder point from the upper surface of the adjacent battery cell after the solder point is desoldered.

[0090] By setting up the solder strip separation mechanism 30, the solder strip and the battery cell at the welding point where the welding has been de-welded can be separated in a timely manner, preventing the solder strip and the battery cell from sticking and solidifying again, thereby ensuring the de-welding effect.

[0091] like Figure 3 As shown, the ribbon separation mechanism 30 includes a moving mechanism 31 and a separation plate 32 connected to the drive end of the moving mechanism 31. The length direction of the separation plate 32 is perpendicular to the stringing direction of the battery string.

[0092] Based on the location of the defective solar cell:

[0093] The laser desoldering mechanism 20 desolders each row of weld points on the upper surface of the defective solar cell, perpendicular to the stringing direction of the solar cell string. The moving mechanism 31 inserts a separating plate 32 into the gap between the first weld strip and the upper surface of the defective solar cell, and drives the separating plate 32 to translate above the defective solar cell along the stringing direction parallel to the solar cell string, so that after each row of weld points is desoldered, the first weld strip at the corresponding row of weld points is separated from the upper surface of the defective solar cell. And / or

[0094] The laser desoldering mechanism 20 desolders each row of weld points on the upper surface of the adjacent battery cell, perpendicular to the stringing direction of the battery string. The moving mechanism 31 inserts the separating plate into the gap between the second weld strip and the upper surface of the adjacent battery cell, and drives the separating plate 32 to translate above the adjacent battery cell along the stringing direction parallel to the battery string, so that after each row of weld points is desoldered, the second weld strip at the corresponding row of weld points is separated from the upper surface of the adjacent battery cell.

[0095] As can be seen, by setting the solder strip separation mechanism 30, during the process of laser desoldering mechanism 20 performing row-by-row desoldering of each row of welding points on defective or adjacent solar cells, after each row of welding points is desoldered, the separation plate 32 of the solder strip separation mechanism 30 can immediately separate all the solder strips at the corresponding row of welding points from the solar cell, ensuring the desoldering effect.

[0096] Continue to refer to Figure 3As shown, optionally, the moving mechanism 31 includes a first translation module 311, a second translation module 312, and a lifting module 313, wherein: the second translation module 312 is connected to the moving end of the first translation module 311, the lifting module 313 is connected to the moving end of the second translation module 312, and the separating piece 32 is connected to the moving end of the lifting module 313. The lifting module 313 is used to drive the separating piece 32 to move up and down. The second translation module 312 is used to drive the separating piece 32 to translate along a second horizontal direction, which is perpendicular to the string direction of the battery string. The first translation module 311 is used to drive the separating piece 32 to translate along a first horizontal direction, which is parallel to the string direction of the battery string.

[0097] Taking the separation of the first solder strip from the defective battery cell as an example, the specific process of the moving mechanism 31 driving the separation plate 32 to perform the separation operation is as follows:

[0098] First, the first translation module 311 drives the separation piece 32 to translate along the first horizontal direction to the space between the defective battery cell and the adjacent battery cell on the first side. Then, the lifting module 313 drives the separation piece 32 to rise and fall, so that the separation piece 32 is slightly higher than the upper surface of the defective battery cell.

[0099] Next, the second translation module 312 drives the separation piece 32 to translate along the second horizontal direction, so that the separation piece 32 is inserted into the gap between the first weld strip and the upper surface of the defective cell. After the laser desoldering mechanism 20 completes the desoldering of each row of weld points, the first translation module 311 immediately drives the separation piece 32 to translate once along the first horizontal direction, thereby separating the first weld strip at the corresponding row of weld points after desoldering from the upper surface of the defective cell.

[0100] The process of the moving mechanism 31 driving the separating piece 32 to separate the second welding strip from the adjacent battery cell on the second side is basically the same as the process of separating the first welding strip from the defective battery cell, and will not be described in detail here.

[0101] like Figure 4 As shown, the separating plate 32 is an elongated structure with a downwardly inclined first side guide slope 321 formed on its upper surface. When the separating plate 32 moves along the first horizontal direction, the first side guide slope 321 faces the welding point to be desoldered, thereby making it easier for the separating plate 32 to lift the solder strip to separate it from the battery cell. Preferably, a second side guide slope 322 opposite to the first side guide slope 321 is also formed on the upper surface of the separating plate 32, so that regardless of the placement direction of the battery string, either the first side guide slope 321 or the second side guide slope 322 in the separating plate 32 can face the welding point.

[0102] like Figure 2As shown, optionally, the disassembly platform 10 includes a mounting base 11, an intermediate support platform 12, a first side support platform 13, and a second side support platform 14. The intermediate support platform 12 is fixedly mounted on the mounting base 11. The first side support platform 13 is movably connected to the mounting base 11 and located on the first side of the intermediate support platform 12. The first side support platform 13 is configured to translate toward or away from the intermediate support platform 12 and to move vertically. The second side support platform 14 is movably connected to the mounting base 11 and located on the second side of the intermediate support platform 12. The second side support platform 14 is configured to translate toward or away from the intermediate support platform 12 and to move vertically. The intermediate support platform 12 is used to support defective solar cells, the first side support platform 13 is used to support solar cells located on the first side of the defective solar cells, and the second side support platform 14 is used to support solar cells located on the second side of the defective solar cells.

[0103] Taking a defective solar cell as an example, such as Figure 2 As shown ( Figure 2 (The solder strips on the upper surfaces of adjacent cells located on both sides of the defective cell are not shown.) The disassembly platform 10 and the laser desoldering mechanism 20 work together to disassemble the defective cell. The specific process is as follows:

[0104] In the initial state, the middle support platform 12, the first side support platform 13 and the second side support platform 14 are connected in the horizontal direction and aligned in the vertical direction, that is, the middle support platform 12, the first side support platform 13 and the second side support platform 14 are connected to form a continuous horizontal support platform.

[0105] The battery string is loaded onto the disassembly platform 10, and the defective battery cell is placed on the middle support platform 12. The battery cells on the first side of the defective battery cell are placed on the first side support platform 13, and the battery cells on the second side of the defective battery cell are placed on the second side support platform 14.

[0106] Disassembly of defective battery cells was carried out:

[0107] The laser desoldering mechanism 20 sequentially desolders the first weld strip on the upper surface of the defective solar cell and the second weld strip on the upper surface of the adjacent solar cell located on the second side support platform 14, thus completing the desoldering of the defective solar cell. For details, please refer to the relevant description above, which will not be repeated here.

[0108] Next, the first side support platform 13 is controlled to move the battery cell located on the first side of the defective battery cell away from the middle support platform 12, and the second side support platform 14 is controlled to move the battery cell located on the second side of the defective battery cell away from the middle support platform 11.

[0109] Finally, the defective cells with the second weld strip remaining on the lower surface are disassembled from the battery string and held on the intermediate support platform 12.

[0110] When the defective cell is the head cell, after the defective cell is desoldered, it is only necessary to control the second side support platform 14 to move the cell located on the second side of the defective cell away from the middle support platform 12 to separate the defective cell into the battery string.

[0111] When the defective battery cell is the tail battery cell, after the defective battery is desoldered, it is only necessary to control the first side support platform 13 to move the battery cell located on the first side of the defective battery cell away from the middle support platform 12 to separate the defective battery cell into the battery string.

[0112] As mentioned above, the battery string disassembly device of the present invention also includes a solder strip separation mechanism 30. In order to make it easier for the separation piece 32 in the solder strip separation mechanism to be inserted into the gap between the first solder strip and the upper surface of the defective battery cell, and / or into the gap between the second solder strip and the upper surface of the adjacent battery cell, after the battery string is loaded onto the disassembly platform 10, the first side support platform 13 and / or the second side support platform 14 can be driven to rise and fall in the vertical direction, so that a height difference is formed between the defective battery cell and the adjacent battery cell, and the solder strip segment located between the defective battery cell and the adjacent battery cell is lifted and fully exposed, providing space for the insertion of the separation piece 32.

[0113] Taking a defective battery cell as an example, after the battery string is loaded onto the disassembly platform 10, the first side support platform 13 is driven to rise, lifting the first weld strip located between the defective battery cell and its adjacent battery cell on the first side. The second side support platform 14 is driven to fall, lifting the second weld strip located between the defective battery cell and its adjacent battery cell on the second side. Then, the separation piece 32 is driven to be inserted from below the lifted first weld strip into the gap between the first weld strip and the upper surface of the defective battery cell. After the first weld strip on the upper surface of the defective battery cell is desoldered, the separation piece 32 is driven to be withdrawn and then inserted from below the lifted second weld strip into the gap between the second weld strip and the upper surface of the adjacent battery cell to perform the desoldering operation and complete the desoldering of the defective battery cell.

[0114] Optionally, the intermediate support platform 12 has adsorption holes on its support surface, through which defective solar cells are adsorbed. A first side support platform 13 has a first side adsorption plate 131 at its end near the intermediate support platform 12, which is used to support and adsorb adjacent solar cells located on the first side of the defective solar cell. A second side support platform 14 has a second side adsorption plate 141 at its end near the intermediate support platform 12, which is used to support and adsorb adjacent solar cells located on the second side of the defective solar cell. The first side adsorption plate 131 and the second side adsorption plate 141 can also use adsorption holes as the adsorption structure.

[0115] Taking the defective battery cell as an example, after placing the battery string to be disassembled on the disassembly platform 10 and adjusting its position, the intermediate support platform 12, the first side adsorption plate 131, and the second side adsorption plate 141 respectively adsorb the defective battery cell and the adjacent battery cells located on the first and second sides of the defective battery cell. This ensures that when the first side support platform 13 and the second side support platform 14 move away from the intermediate support platform 12, the defective battery cell and the adjacent battery cells on both sides will not move.

[0116] Optionally, the battery string disassembly device in this embodiment of the invention further includes a battery cell feeding mechanism and a welding ribbon traction mechanism, wherein: the battery cell feeding mechanism is used to feed a replacement battery cell with at least a third welding ribbon welded to its lower surface onto the disassembly platform to replace the removed defective battery cell with at least a second welding ribbon on its lower surface; the welding ribbon traction mechanism is configured to pull and stack a first welding ribbon onto the upper surface of the replacement battery cell, and / or pull and stack a third welding ribbon onto the upper surface of an adjacent battery cell; the laser desoldering mechanism is further configured to weld the first welding ribbon onto the upper surface of the replacement battery cell, and / or weld the third welding ribbon onto the upper surface of an adjacent battery cell.

[0117] The following example, using a defective cell as the cell in the string, illustrates the specific process of welding a replacement cell to the battery string, with the cooperation of the cell feeding mechanism, the ribbon traction mechanism, the disassembly platform 10, and the laser desoldering mechanism 20:

[0118] First, the defective battery cells that have been disassembled from the battery string are removed from the intermediate support platform 12.

[0119] Next, the cell feeding mechanism places the replacement cell onto the intermediate support platform 12. As described above, the lower surface of the replacement cell is welded with a third weld strip, which extends outward to the second side of the intermediate support platform 12.

[0120] Next, the control welding strip traction mechanism clamps the first welding strip on the first adjacent battery cell and moves it towards the middle support platform 12 together with the first side support platform 13. Preferably, during the translation process, the height of the first side support platform 13 is higher than that of the middle support platform 12 to avoid scratching the replacement battery cell. After the first side support platform 13 moves into place, the first welding strip on the first adjacent battery cell reaches the top of the replacement battery cell. After the first welding strip is straightened, the control mechanism lowers the first side support platform 13 back into place, thereby laying the first welding strip on the upper surface of the replacement battery cell.

[0121] Next, the control welding strip traction mechanism clamps and straightens the third welding strip on the replacement cell, and controls the second side support platform 14 to move towards the middle support platform 12. Preferably, during the translation process, the height of the second side support platform 14 is lower than that of the middle support platform 12 to avoid scratching the adjacent cell on the second side. After the second side support platform 14 is translated into place, the control mechanism raises the second side support platform 14 back into place, thereby laying the third welding strip on the upper surface of the adjacent cell on the second side.

[0122] Finally, the laser desoldering mechanism 20 is controlled to weld the first solder strip to the upper surface of the replacement cell and the third solder strip to the upper surface of the adjacent cell.

[0123] Preferably, similar to the method of unsoldering the weld strip by row-by-row welding points, in order to improve welding efficiency, the method of welding by row-by-row welding points can also be used.

[0124] The welding of the replacement battery cell is now complete.

[0125] Of course, the execution order of some of the above operation steps can be adjusted, and they can even be implemented simultaneously.

[0126] Optionally, the battery cell disassembly device in this embodiment of the invention further includes a vision device, which is disposed above the intermediate support platform 12. The vision device 12 is used to determine the position of the replacement battery cell and the second adjacent battery cell. Based on the position of the replacement battery cell and the second adjacent battery cell, the welding ribbon traction mechanism lays the first welding ribbon on the first adjacent battery cell to the corresponding position on the upper surface of the replacement battery cell, and lays the third welding ribbon to the corresponding position on the upper surface of the second adjacent battery cell. Optionally, the vision device includes a lifting drive mechanism and a camera mounted on the drive end of the lifting drive mechanism.

[0127] Optionally, the battery string disassembly device of this embodiment further includes a solder replenishment mechanism. The solder replenishment mechanism is disposed on the side of the disassembly platform 10 or the battery cell feeding mechanism, and is used to replenish solder on the upper surface of the replacement battery cell. This avoids incomplete soldering after the first solder strip is desoldered and soldered to the upper surface of the replacement battery cell, further improving the soldering effect of the replacement battery cell. It should be noted that after the second solder strip is desoldered and separated from the adjacent battery cell, the solder on the second solder strip will remain on the upper surface of the adjacent battery cell. Therefore, effective soldering between the adjacent battery cell and the third solder strip can be achieved without replenishing solder on the adjacent battery cell.

[0128] Of course, battery cells with solder dots printed on their upper surface can also be used directly as replacement electrolytic cells, meaning that the replacement battery cells provided by the battery cell supply mechanism already have solder dots printed on their upper surface. In this case, there is no need to perform any soldering operation on the replacement electrolytic cells.

[0129] This invention also provides a method for disassembling battery strings, which can be implemented by the battery string disassembly device and the corresponding control program described in the foregoing embodiments, such as... Figure 5 As shown, the battery string disassembly method may include the following steps:

[0130] Step 100: Identify defective cells in the battery string;

[0131] Step 200: Irradiate each welding point on the upper surface of the defective battery cell with a laser beam to desolder and separate the first weld strip connected to the upper surface of the defective battery cell from the defective battery cell; and / or, irradiate each welding point on the upper surface of the adjacent battery cell adjacent to the defective battery cell with a laser beam to desolder and separate the second weld strip connected to the lower surface of the defective battery cell from the adjacent battery cell, so as to disassemble at least the defective battery cell with the second weld strip on the lower surface.

[0132] As can be seen, the battery string disassembly method provided by this invention disassembles defective battery cells by only unsoldering the solder strips on the upper surface of the battery string. Specifically, the defective battery cell is unsoldered and separated from the first solder strip on its upper surface, and then the second solder strip connected to the lower surface of the defective battery cell is unsoldered and separated from the adjacent battery cell. This allows the defective battery cell and the second solder strip connected to its lower surface to be disassembled together from the battery string. Since the unsoldered solder strips are all located on the upper surface of the battery string, when welding replacement battery cells, the welding positions of the solder strips are also all located on the upper surface of the battery string. Therefore, the solder strips can be pulled and stacked from the top of the battery string onto the corresponding battery cell, avoiding the need to stack solder strips on the lower surface of the replacement battery cell, thereby improving the rework efficiency of the battery string.

[0133] In particular, the battery string disassembly method provided by this invention uses a laser beam to desolder the solder strips. Compared with the traditional light box desoldering method, the heat of the laser beam is controllable. On the one hand, it can desolder the solder strips on the upper surface of adjacent battery cells without desoldering the solder strips on the lower surface of adjacent battery cells, thereby avoiding secondary welding between the solder strips on the lower surface of adjacent battery cells and adjacent battery cells, and thus avoiding the occurrence of cold solder joints. On the other hand, it can also effectively reduce the thermal deformation of battery cells.

[0134] Optionally, in step 200, irradiating the weld points on the upper surface of the defective solar cell with a laser beam may specifically include: controlling the laser beam to sequentially project onto each row of weld points on the upper surface of the defective solar cell that is perpendicular to the stringing direction of the solar cells, so that the same row of weld points perpendicular to the stringing direction of the solar cells can be de-welded simultaneously. Irradiating the weld points on the upper surface of an adjacent solar cell adjacent to the defective solar cell may specifically include: controlling the laser beam to sequentially project onto each row of weld points on the upper surface of the adjacent solar cell that is perpendicular to the stringing direction of the solar cells, so that the same row of weld points perpendicular to the stringing direction of the solar cells can be de-welded simultaneously.

[0135] Each laser beam is projected onto a row of welding points, thereby completing the synchronous desoldering of all the weld strips on that row of welding points and improving desoldering efficiency.

[0136] Optionally, in step 200, after the laser beam irradiates the welding points on the upper surface of the defective battery cell, the battery string disassembly method of the present invention further includes: separating the first weld strip at the corresponding welding point from the defective battery cell within a predetermined time period. Similarly, optionally, after the laser beam irradiates the welding points on the upper surface of adjacent battery cells, the battery string disassembly method of the present invention further includes: separating the second weld strip at the corresponding welding point from the adjacent battery cell within a predetermined time period.

[0137] By promptly separating the solder strips and battery cells at the desoldering points, the re-adhesion and solidification of the solder strips and battery cells can be prevented, thus ensuring the desoldering effect. The predetermined time period can be selected according to the actual situation. Generally speaking, the shorter the time period, the better. That is, after the desoldering of the current row of solder points is completed, the solder strips and battery cells at the solder points of that row should be separated immediately.

[0138] Optionally, after performing the defective battery cell disassembly operation in step 200, the present invention further includes the following steps:

[0139] Step 300: Load the replacement cell with at least a third weld strip welded to its lower surface to the position of the original defective cell, and pull and stack the first weld strip to a designated position on the upper surface of the replacement cell, and / or pull and stack the third weld strip to a designated position on the upper surface of the adjacent cell; use a laser to weld the first weld strip to the upper surface of the replacement cell, and / or weld the third weld strip to the upper surface of the adjacent cell.

[0140] The battery string is repaired by automatically welding replacement cells to the empty positions after the defective cells are disassembled. Laser welding is used during the welding process, which can reduce the deformation of the cells and does not affect the connection between the cells and the lower surface weld strips when welding the upper surface of the cells.

[0141] The present invention has been described above in sufficient detail and with certain specificities. 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 the invention should fall within the protection scope of the invention. The scope of protection claimed by the present invention is defined by the claims, and not by the above descriptions in the embodiments.

Claims

1. A battery string disassembly device, characterized in that, The battery string disassembly device includes a disassembly platform and a laser desoldering mechanism, wherein: The disassembly platform is configured to carry a battery string to be disassembled, wherein there are defective battery cells in the battery string that need to be disassembled. The laser desoldering mechanism is configured to use a laser beam to desolder the first solder strip on the upper surface of the defective battery cell to each solder joint between the defective battery cell and the defective battery cell, and to desolder the second solder strip connected to the lower surface of the defective battery cell to each solder joint between the defective battery cell and the adjacent battery cell. The disassembly platform is also configured to move battery cells located on one or both sides of the defective battery cell away from the defective battery cell, so as to disassemble the defective battery cell with at least the second solder strip on its lower surface. The battery string disassembly device further includes a solder strip separation mechanism, which is configured to separate the first solder strip at the corresponding solder point from the upper surface of the defective battery cell after the solder point is desoldered, and to separate the second solder strip at the corresponding solder point from the upper surface of the adjacent battery cell after the solder point is desoldered.

2. The battery string disassembly device as described in claim 1, characterized in that, The laser desoldering mechanism includes a laser generator, a galvanometer assembly, and a field lens, wherein: The laser generator emits the laser beam toward the galvanometer assembly; The galvanometer assembly reflects the laser beam to the field mirror; The field lens focuses the laser beam and projects it onto each of the welding points on the upper surface of the defective solar cell, thereby desoldering the first solder strip from the defective solar cell, and / or focuses the laser beam and projects it onto each of the welding points on the upper surface of the adjacent solar cell, thereby desoldering the second solder strip from the adjacent solar cell.

3. The battery string disassembly device as described in claim 2, characterized in that, The laser desoldering mechanism also includes a transverse module and a mounting base connected to the moving end of the transverse module. The laser generator, the galvanometer assembly and the field lens are all mounted on the mounting base. The lateral movement module is used to drive the mounting base to translate so that the field lens moves to above the defective solar cell and / or above the adjacent solar cell. The field lens focuses the laser beam and projects it sequentially onto each row of welding points on the upper surface of the defective solar cell that are perpendicular to the stringing direction of the solar cell, and / or focuses the laser beam and projects it sequentially onto each row of welding points on the upper surface of the adjacent solar cell that are perpendicular to the stringing direction of the solar cell.

4. The battery string disassembly device as described in claim 1, characterized in that, The welding strip separation mechanism includes a moving mechanism and a separation plate connected to the drive end of the moving mechanism, wherein the length direction of the separation plate is perpendicular to the stringing direction of the battery string; The laser desoldering mechanism is configured to desolder each row of weld points on the upper surface of the defective battery cell, perpendicular to the stringing direction of the battery string, row by row. The moving mechanism is configured to insert the separating plate into the gap between the first weld strip and the upper surface of the defective battery cell, and drive the separating plate to translate above the defective battery cell along the stringing direction parallel to the battery string, so as to separate the first weld strip at the corresponding row of weld points from the upper surface of the defective battery cell after each row of weld points is desoldered. and / or The laser desoldering mechanism is configured to desolder each row of weld points on the upper surface of the adjacent battery cell, perpendicular to the stringing direction of the battery string, row by row. The moving mechanism is configured to insert the separating plate into the gap between the second weld strip and the upper surface of the adjacent battery cell, and drive the separating plate to translate above the adjacent battery cell along the stringing direction parallel to the battery string, so as to separate the second weld strip at the corresponding row of weld points from the upper surface of the adjacent battery cell after each row of weld points is desoldered.

5. The battery string disassembly device as described in claim 4, characterized in that, The moving mechanism includes a first translation module, a second translation module, and a lifting module, wherein: The second translation module is connected to the moving end of the first translation module, the lifting module is connected to the moving end of the second translation module, and the separating piece is connected to the moving end of the lifting module; The lifting module is used to drive the separation plate to rise and fall; The second translation module is used to drive the separator to translate along a second horizontal direction, which is perpendicular to the stringing direction of the battery string; The first translation module is used to drive the separator to translate along a first horizontal direction, which is parallel to the stringing direction of the battery string.

6. The battery string disassembly device as described in claim 4, characterized in that, The separation plate has a long strip-shaped structure; A downward-sloping first side guide ramp is formed above the separating plate; or, The separation plate has a downwardly inclined first side guide slope and a second side guide slope opposite to the first side guide slope.

7. The battery string disassembly device as described in claim 1, characterized in that, The disassembly platform includes a mounting base, a central support platform, a first side support platform, and a second side support platform, wherein: The intermediate support platform is fixedly mounted on the mounting base. The first side support platform is movably connected to the mounting base and located on the first side of the intermediate support platform. The first side support platform is configured to be able to translate toward or away from the intermediate support platform and to move up and down in the vertical direction. The second side support platform is movably connected to the mounting base and located on the second side of the intermediate support platform. The second side support platform is configured to be able to translate toward or away from the intermediate support platform and to move up and down in the vertical direction. The intermediate support platform is used to support the defective battery cell, the first side support platform is used to support the battery cell located on the first side of the defective battery cell, and the second side support platform is used to support the battery cell located on the second side of the defective battery cell.

8. The battery string disassembly device as described in claim 7, characterized in that, The intermediate support platform has adsorption holes on its support surface, and the defective battery cell is adsorbed by the adsorption holes through the support surface. The first side support platform is provided with a first side adsorption plate at the end near the middle support platform. The first side adsorption plate is used to support and adsorb adjacent battery cells located on the first side of the defective battery cell. The second side support platform is provided with a second side adsorption plate at the end near the middle support platform. The second side adsorption plate is used to support and adsorb adjacent battery cells located on the second side of the defective battery cell.

9. The battery string disassembly apparatus according to any one of claims 1 to 8, characterized in that, The battery string disassembly device also includes a battery cell feeding mechanism and a welding strip traction mechanism, wherein: The cell feeding mechanism is configured to feed a replacement cell with at least a third solder strip welded to its lower surface onto the disassembly platform to replace the defective cell with at least a second solder strip on its lower surface that has been removed. The welding strip traction mechanism is configured to traction and stack the first welding strip onto the upper surface of the replacement battery cell, and / or traction and stack the third welding strip onto the upper surface of the adjacent battery cell; The laser desoldering mechanism is also configured to weld the first solder strip to the upper surface of the replacement cell, and / or weld the third solder strip to the upper surface of the adjacent cell.

10. The battery string disassembly device as described in claim 9, characterized in that, The battery string disassembly device also includes a soldering mechanism, which is disposed on the side of the disassembly platform or the battery cell feeding mechanism. The soldering mechanism is used to apply solder to the upper surface of the replacement battery cell. Alternatively, the replacement battery cell provided by the battery cell feeding mechanism is a battery cell with solder dots printed on its upper surface.

11. A method for disassembling a battery string, characterized in that, The battery string disassembly method includes: Identify defective cells in a battery string; A laser beam is used to irradiate each welding point on the upper surface of the defective battery cell to desolder and separate the first weld strip connected to the upper surface of the defective battery cell from the defective battery cell; and a laser beam is used to irradiate each welding point on the upper surface of an adjacent battery cell adjacent to the defective battery cell to desolder and separate the second weld strip connected to the lower surface of the defective battery cell from the adjacent battery cell, so as to disassemble the defective battery cell with at least the second weld strip on its lower surface.

12. The battery string disassembly method as described in claim 11, characterized in that, The step of irradiating each welding point on the upper surface of the defective battery cell with a laser beam includes: controlling the laser beam to be sequentially projected onto each row of welding points on the upper surface of the defective battery cell that are perpendicular to the stringing direction of the battery string, so that the same row of welding points perpendicular to the stringing direction of the battery string can be desoldered simultaneously. The step of using a laser beam to irradiate each welding point on the upper surface of an adjacent battery cell adjacent to the defective battery cell includes: controlling the laser beam to sequentially project onto each row of welding points on the upper surface of the adjacent battery cell that are perpendicular to the stringing direction of the battery string, so that the same row of welding points perpendicular to the stringing direction of the battery string are simultaneously desoldered.

13. The battery string disassembly method as described in claim 11, characterized in that, After the laser beam irradiates the welding point on the upper surface of the defective solar cell, the method further includes: separating the first weld strip at the corresponding welding point from the defective solar cell within a predetermined time period. After the laser beam irradiates the welding point on the upper surface of the adjacent solar cell, the method further includes: separating the second weld strip at the corresponding welding point from the adjacent solar cell within a predetermined time period.

14. The battery string disassembly method as described in claim 11, characterized in that, After disassembling the defective battery cell with at least the second solder strip on its lower surface, the method further includes: loading a replacement battery cell with at least the third solder strip welded to its lower surface to the location of the original defective battery cell, pulling and stacking the first solder strip to a designated position on the upper surface of the replacement battery cell, and pulling and stacking the third solder strip to a designated position on the upper surface of the adjacent battery cell. The first solder strip is welded to the upper surface of the replacement cell using a laser, and the third solder strip is welded to the upper surface of the adjacent cell.

Images