Laser welding repair method for photovoltaic module

Abstract

The invention provides a photovoltaic module laser welding repairing method. The photovoltaic module laser welding repairing method comprises the steps that a welding strip on a bad battery piece is removed; cutting non-cross-linked areas on two sides, perpendicular to the main grid, of the bad battery piece so as to increase the piece distance between the two sides of the bad battery piece; cutting the front adhesive film along the sheet spacing and the string spacing around the bad battery sheet so as to take down the bad battery sheet; and after a repairing adhesive film is placed at the position of the bad battery piece, a replacement battery piece is placed on the repairing adhesive film, and the replacement battery piece and the welding strip are welded again, so that photovoltaic module repairing is completed. According to the invention, the non-crosslinking area of the defective battery piece is cut, so that the piece distance between the two sides of the defective battery piece is increased, an art knife can extend into the piece distance and cut the front adhesive film corresponding to the piece distance, the defective battery piece can be taken down independently, and the production efficiency of the defective battery piece is improved. Good battery pieces and welding strips in the bad battery strings do not need to be replaced, so that the loss of the battery pieces and the welding strips is reduced, and the repair cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic module production, in particular to a photovoltaic module laser welding repair method. BACKGROUND

[0002] The back contact cell in the prior art adopts laser welding to improve production efficiency. However, for the photovoltaic module with defects after laser welding, the cell sheet and the front film are pasted together due to high temperature generated by laser welding, and the cell sheet has very small sheet spacing, so that the current photovoltaic module repair can only be carried out by replacing the entire cell string. Therefore, the repair cost of the photovoltaic module after laser welding in the prior art is high, and the cell sheet is greatly wasted. SUMMARY

[0003] Therefore, it is necessary to provide a photovoltaic module laser welding repair method to solve the problems of high repair cost and great waste of cell sheets after laser welding of the photovoltaic module in the prior art.

[0004] The technical scheme is as follows:

[0005] On the one hand, a photovoltaic module laser welding repair method is provided, comprising:

[0006] The welding strip on the defective cell sheet is removed;

[0007] The non-crosslinked area on the two sides of the defective cell sheet perpendicular to the main grid is cut to increase the sheet spacing on the two sides of the defective cell sheet;

[0008] The front film is cut along the sheet spacing and string spacing around the defective cell sheet to remove the defective cell sheet;

[0009] After placing a repair film at the position of the defective cell sheet, a replacement cell sheet is placed on the repair film, and the replacement cell sheet and the welding strip are re-welded to complete the repair of the photovoltaic module.

[0010] The technical scheme is further described as follows:

[0011] In one embodiment, the non-crosslinked area of the defective cell sheet is provided with a cutting line for cutting, and the cutting line extends in a straight line direction.

[0012] In one embodiment, the cutting line is spaced apart from the edge of the defective cell sheet by 4mm to 5mm.

[0013] In one embodiment, all the pads on the defective cell sheet are spaced between the two cutting lines.

[0014] In one embodiment, the step of cutting the uncrosslinked area on both sides of the defective cell perpendicular to the main grid includes:

[0015] The uncrosslinked area on both sides of the defective cell perpendicular to the main grid is cut by pulsed laser.

[0016] In one embodiment, the step of cutting the uncrosslinked area on both sides of the defective cell perpendicular to the main grid to increase the cell spacing on both sides of the defective cell further includes:

[0017] The material cut from the defective cell is sucked away.

[0018] In one embodiment, the size of the repair film is adapted to the size of the replacement cell.

[0019] In one embodiment, the step of removing the solder strip on the defective cell is preceded by:

[0020] After the laser welding of the cells on the front film is completed, the EL test is performed on all the cells on the front film to identify the defective cell.

[0021] In one embodiment, after the step of placing a repair film at the location of the defective cell, placing a replacement cell on the repair film, and re-welding the replacement cell with the solder strip to complete the photovoltaic module repair, further includes:

[0022] The repaired photovoltaic module is subjected to EL test again, if the defective cell is identified, the step of removing the solder strip on the defective cell is returned to; if the defective cell is not identified, the photovoltaic module repair is qualified, and is transported to the next process.

[0023] In one embodiment, the step of cutting the uncrosslinked area on both sides of the defective cell perpendicular to the main grid includes:

[0024] The EL tester feeds back the position information of the defective cell on the front film to the laser cutting device;

[0025] The photovoltaic module to be repaired is transported to the laser cutting device, and the laser cutting device cuts the uncrosslinked area on both sides of the defective cell perpendicular to the main grid according to the position information of the defective cell on the front film and the position information of the photovoltaic module to be repaired on the laser cutting device.

[0026] Compared with existing string replacement repair methods, the photovoltaic module laser welding repair method in this application has at least the following advantages: 1. Defective cells can be individually removed from defective cell strings without replacing good cells and solder ribbons, reducing cell and ribbon losses and lowering repair costs after laser welding of photovoltaic modules. 2. By cutting the non-crosslinked areas on both sides of the defective cell perpendicular to the main grid, the spacing between the defective cells is increased, allowing a utility knife to reach into this spacing and cut the front adhesive film at the corresponding spacing, ensuring that the defective cell can be individually removed from the photovoltaic module. 3. By replacing defective cells individually, the length of the cutting required on the front adhesive film is greatly reduced, lowering the risk of tearing good cells. Simultaneously, the increased spacing reduces the difficulty of manual cell replacement repair, improving the repair efficiency after laser welding of photovoltaic modules. 4. The cell replacement repair method requires minimal changes to the repair equipment, improving the practicality of the photovoltaic module laser welding repair method. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a flowchart of a photovoltaic module laser welding repair method according to one embodiment.

[0030] Figure 2 This is a partial structural schematic diagram of a photovoltaic module according to one embodiment.

[0031] Figure 3 This is a schematic diagram of the structure of a battery cell according to one embodiment.

[0032] Figure 4 This is a schematic diagram of the structure of a defective battery cell before cutting, according to one embodiment.

[0033] Figure 5 for Figure 4 A schematic diagram of the structure of a defective battery cell after cutting.

[0034] Figure 6 A flowchart of a photovoltaic module laser welding repair method according to another embodiment.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100, cell; 110, pad; 120, main grid; 130, non-crosslinked region; 140, crosslinked region; 150, cell spacing; 160, cutting line; 200, front-side adhesive film; 300, glass. DETAILED DESCRIPTION

[0037] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and with modifications thereof, without departing from the scope of the present application, and it is understood that these similarities can be made by those skilled in the art without departing from the spirit of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0038] Laser welding is a high-precision and high-efficiency welding technology widely used in manufacturing. It uses the high energy density of laser beam to heat the material to a molten or vaporized state, thereby realizing the connection of the material. In the photovoltaic industry, laser welding is mainly used for the connection between the solder strip and the pad (i.e. PAD point) of the cell, which is suitable for PERC, TOPCon, HJT, BC and other high-efficiency cell technologies, and is in line with the production needs of the photovoltaic industry.

[0039] For back contact cells (BC cells), since the positive and negative electrodes are both on the back surface and arranged in an interdigitated manner, and there is no grid line on the front surface, laser welding can be performed in the form of whole-plate welding, which can greatly improve production efficiency. Laser welding is line scanning welding, with high welding power and concentrated welding energy. The specific process of laser welding is as follows: 1. First, lay the glass and front-side adhesive film on the table; 2. Arrange the cells on the front-side adhesive film, with the back surface (i.e. the welding surface) of the cells facing upwards; 3. Place the solder strip on the cell according to the welding requirements; 4. Cover the laser adhesive film, and vacuum to make the solder strip as close as possible to the tin paste points to ensure the welding effect; 5. Laser welding is performed by line scanning to weld the solder strip and the pad; 6. After welding is completed, lift the laser adhesive film.

[0040] The laser welding uses a continuous line scanning mode, and the laser generates a high temperature to melt the solder layer of the solder tape and the solder paste and the silver paste of the battery piece to form metallization. Because the laser generates a high temperature of about 200 degrees Celsius, heat is transferred to the front adhesive film under the battery piece, the front adhesive film is cross-linked, and the battery piece is bonded together. If defects such as hidden cracks and short circuits occur after welding, the battery piece needs to be repaired and replaced, and the battery piece and the front adhesive film are bonded together, so the battery piece cannot be removed from the film. The spacing between the battery pieces is only about 0.5 mm, and a general art knife cannot enter the spacing between the pieces to cut the front adhesive film. The spacing between the battery strings is about 1.5 mm, which is larger than the spacing between the pieces. The art knife can cut the front adhesive film along the string spacing, and then the entire battery string is removed and replaced with a new battery string. The prior art can only use the string replacement method to repair the photovoltaic module after laser welding. The method of repairing the photovoltaic module after laser welding by replacing the string has at least the following disadvantages: 1. The defects of the photovoltaic module after welding are generally 1 to 2 defective pieces that need to be replaced. The entire battery string, which generally has 11 to 12 pieces, is replaced when one piece is defective, resulting in a large waste of battery pieces. 2. The length of the battery string is longer, and the art knife is used to walk in the longer string gap, which can easily cause new broken pieces.

[0041] Therefore, the photovoltaic module laser welding repair method of the embodiments of the present application is designed to solve the above technical problems.

[0042] As shown in the drawings, Figure 1 In one embodiment, a photovoltaic module laser welding repair method is provided, comprising at least the following steps:

[0043] S100, the solder tape on the defective battery piece is removed. In this way, the connection between the defective battery piece and the adjacent battery piece is released, ensuring that the defective battery piece can be removed from the defective battery string, and the good battery pieces and solder tapes in the defective battery string do not need to be replaced, reducing the loss of battery pieces 100 and solder tapes and reducing the repair cost of the photovoltaic module after laser welding.

[0044] S200, the non-cross-linked area 130 perpendicular to the main grid 120 on both sides of the defective battery piece is cut to increase the spacing 150 between the two sides of the defective battery piece. In this way, the spacing 150 between the two sides of the defective battery piece is increased, so that the art knife can enter the spacing 150 and cut the front adhesive film 200 corresponding to the spacing 150, ensuring that the defective battery piece can be removed from the photovoltaic module.

[0045] As shown in the drawings, Figure 2As shown, in particular to the embodiment, the photovoltaic module includes the cell sheet 100, the front adhesive film 200 and the glass 300. The front adhesive film 200 is laid on the glass 300. The cell sheet 100 is arranged on the side of the front adhesive film 200 away from the glass 300, and the back of the cell sheet 100 (i.e. the welding surface) faces upward. After laser welding of the cell sheet 100, the front adhesive film 200 is cross-linked under the action of high temperature, resulting in that the cell sheet 100 and the front adhesive film 200 are bonded together and cannot be separated, but the front adhesive film 200 and the glass 300 will not be bonded together.

[0046] As shown, Figure 3 In particular to the embodiment, the cell sheet 100 is provided with the bonding pad 110 for interconnecting between the cell sheets 100, and the main grid 120 for collecting and conducting current. The number of the main grid 120 is multiple, and each main grid 120 is arranged at the middle position of the back of the cell sheet 100. Each main grid 120 is provided with multiple bonding pads 110 arranged at intervals along the extension direction of the main grid 120. The head and tail bonding pads 110 on the main grid 120 are about 6mm away from the edge of the cell sheet 100, so that the area between the head and tail bonding pads 110 and the edge of the cell sheet 100 has less heat conduction after welding, and the front adhesive film 200 corresponding to the area is not cross-linked, and the front adhesive film 200 corresponding to the area is not bonded with the cell sheet 100.

[0047] It should be noted that the non-cross-linked area 130 refers to the area between the head and tail bonding pads 110 and the edge of the cell sheet 100 on the cell sheet 100. In particular to the embodiment, the number of the non-cross-linked area 130 is four. The four non-cross-linked areas 130 correspond to the four sides of the cell sheet 100. The four non-cross-linked areas 130 are sequentially connected in a head-to-tail manner, and the enclosed area is the cross-linked area 140.

[0048] As shown, Figure 4 and Figure 5 In particular to the embodiment, the non-cross-linked area 130 of the defective cell sheet 100 is provided with a cutting line 160 for cutting, and the cutting line 160 extends along a straight line. In other embodiments, the cutting line 160 on the defective cell sheet can also extend along an irregular line such as a curve or an arc.

[0049] It should be noted that the cutting line 160 is virtually present, that is, the cutting line 160 is the cutting track line when the cutting device cuts the non-cross-linked area 130 of the defective cell sheet 100.

[0050] In particular to the embodiment, the cutting line 160 is spaced apart from the edge of the defective cell sheet by 4mm to 5mm. In this way, the sheet spacing 150 can maintain a larger width, ensuring that the art knife will not damage the good cell sheet when it cuts the front adhesive film 200 at the sheet spacing 150, and improving the repair qualification rate of the photovoltaic module after laser welding.

[0051] As shown in Figure 4 and Figure 5 In the embodiment, all the pads 110 on the defective cell are spaced between the two cutting lines 160. In this way, the cutting lines 160 are spaced from the cross-linking regions 140 to ensure that the material cut from the cell 100 will not be bonded to the front film 200 and can be smoothly removed from the photovoltaic module, improving the convenience of the photovoltaic module after laser welding.

[0052] It should be noted that any cutting method capable of cutting the cell 100 in the prior art can be used.

[0053] As shown in Figure 6 Optionally, S210, the non-cross-linking regions 130 on the two sides of the defective cell perpendicular to the main grid 120 are cut by pulsed laser. In this way, the instantaneous high energy of the pulsed laser can achieve micron-level cutting, with the characteristics of narrow cutting seam, extremely small heat-affected zone, and high cutting precision, reducing the adverse effects of cutting the cell 100 on the photovoltaic module, and improving the pass rate of the photovoltaic module after laser welding.

[0054] S220, the material cut from the defective cell is sucked away. In this way, the size of the defective cell is reduced, and the cell spacing 150 on both sides of the defective cell is correspondingly increased to ensure that the defective cell can be individually removed from the photovoltaic module.

[0055] In the embodiment, the material cut from the defective cell is sucked away by a suction nozzle device with vacuum suction. The suction nozzle device can be any structure capable of adsorbing the material of the cell 100 in the prior art.

[0056] S300, the front film 200 is cut along the cell spacing 150 and string spacing around the defective cell to remove the defective cell. In this way, compared with the string replacement repair method, the cell replacement repair method greatly reduces the length of the front film 200 that needs to be cut, reduces the risk of damaging good cells, and reduces the difficulty of manual cell replacement repair after the cell spacing 150 is increased, improving the repair efficiency of the photovoltaic module after laser welding.

[0057] In the embodiment, the four sides of the defective cell include two string spacings and two cell spacings 150.

[0058] S400, after placing a repair film at the location of the defective cell, placing a replacement cell on the repair film, and re-welding the replacement cell and the solder strip, the photovoltaic module repair is completed. In this way, compared with the string replacement repair method, the cell replacement repair method requires less changes to the repair equipment, improving the practicality of the photovoltaic module laser welding repair method.

[0059] It should be noted that the laser welding repair method of the photovoltaic module in the present application can be applied to single piece repair of various photovoltaic modules, for example, photovoltaic modules using back contact cells, and photovoltaic modules with negative spacing arrangement of cells 100.

[0060] Optionally, the size of the repair adhesive film is matched with the size of the replacement cell. In the embodiment, the size of the repair adhesive film is the same as the size of the replacement cell.

[0061] As shown in the figure, in one embodiment, before the step of removing the solder strip on the defective cell, further comprising: Figure 6

[0062] S500, after the laser welding of the cells 100 on the front adhesive film 200, the EL test is performed on all the cells 100 on the front adhesive film 200 to identify the defective cells. In this way, the position of the defective cell in the photovoltaic module can be quickly identified, and the replacement can be accurately performed, thereby improving the repair efficiency of the photovoltaic module after laser welding.

[0063] As shown in the figure, in one embodiment, after placing the repair adhesive film at the position of the defective cell, placing the replacement cell on the repair adhesive film, and re-welding the replacement cell with the solder strip to complete the photovoltaic module repair step, further comprising: Figure 6

[0064] S600, the repaired photovoltaic module is subjected to EL test again, if the defective cell is identified, the step of removing the solder strip on the defective cell is returned to; if the defective cell is not identified, the photovoltaic module is qualified and is transported to the next process. In this way, the single or multiple defective cells in the photovoltaic module can be replaced to ensure the qualification of the photovoltaic module repair, and improve the practicability of the laser welding repair method of the photovoltaic module.

[0065] As shown in the figure, in one embodiment, in the step of cutting the uncrosslinked area 130 on the two sides of the defective cell perpendicular to the main grid 120, comprising: Figure 6

[0066] S230, the EL tester (i.e. electroluminescence tester) feeds back the position information of the defective cell on the front adhesive film 200 to the laser cutting equipment.

[0067] ​​​S240, conveying the photovoltaic module to be repaired to the laser cutting device, and the laser cutting device cuts the uncrosslinked area 130 on the two sides of the defective cell piece perpendicular to the main grid 120 according to the position information of the defective cell piece on the front film 200 and the position information of the photovoltaic module to be repaired on the laser cutting device. In this way, the EL tester and the laser cutting device can be linked to realize automatic and accurate cutting of the defective cell piece in the photovoltaic module, thereby improving the practicability of the photovoltaic module laser welding repair.

[0068] In this embodiment, the laser cutting device includes a laser and a visual detection element (such as a camera or an infrared sensor). The laser is in communication connection with the visual detection element and the EL tester, and can cut the defective cell piece along the cutting line 160. The visual detection element is used to detect the position information of the photovoltaic module to be repaired on the laser cutting device.

[0069] Compared with the string replacement repair method in the prior art, the photovoltaic module laser welding repair method in the present application has at least the following advantages: 1. The defective cell piece can be separated from the defective cell string, and the good cell pieces and the solder strip in the defective cell string do not need to be replaced, thereby reducing the loss of the cell piece 100 and the solder strip and reducing the repair cost of the photovoltaic module after laser welding. 2. By cutting the uncrosslinked area 130 on the two sides of the defective cell piece perpendicular to the main grid 120, the cell spacing 150 on the two sides of the defective cell piece is increased, so that the art knife can be inserted into the cell spacing 150, and the front film 200 at the cell spacing 150 is cut open, thereby ensuring that the defective cell piece can be separated from the photovoltaic module. 3. By replacing the defective cell piece, the length of the front film 200 that needs to be cut is greatly reduced, the risk of the good cell piece being cut is reduced, and the operation difficulty of the manual replacement is reduced after the cell spacing 150 is increased, thereby improving the repair efficiency of the photovoltaic module after laser welding. 4. The replacement repair method has little change to the repair equipment, thereby improving the practicability of the photovoltaic module laser welding repair method.

[0070] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0071] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or identifying the number of the indicated technical features. Thus, a feature limited to "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0072] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature or the like, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0074] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0075] It should also be understood that when interpreting the connection relationship or position relationship of the elements, although not explicitly described, the connection relationship and position relationship are interpreted to include an error range that should be within an acceptable deviation range of a specific value determined by those skilled in the art. For example, "about", "approximately" or "substantially" can mean within one or more standard deviations, without limitation.

[0076] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, as long as the combinations do not conflict with each other, they should be considered to be within the scope of the present disclosure.

[0077] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for laser welding repair of photovoltaic modules, characterized in that, include: Remove the solder strips from the defective battery cells; The non-crosslinked regions on both sides of the defective solar cell perpendicular to the main grid are cut to increase the inter-cell spacing on both sides of the defective solar cell. The front adhesive film is cut along the cell spacing and string spacing around the defective cell to remove the defective cell; After placing a repair film at the location of the defective cell, a replacement cell is placed on the repair film, and the replacement cell is re-welded to the solder strip to complete the photovoltaic module repair.

2. The photovoltaic module laser welding repair method according to claim 1, characterized in that, The non-crosslinked region of the defective battery cell is provided with a cutting line for cutting, which extends in a straight line.

3. The photovoltaic module laser welding repair method according to claim 2, characterized in that, The cutting line is spaced 4mm to 5mm from the edge of the defective battery cell.

4. The photovoltaic module laser welding repair method according to claim 2, characterized in that, All pads on the defective battery cell are spaced apart between the two cutting lines.

5. The photovoltaic module laser welding repair method according to claim 1, characterized in that, The step of cutting the non-crosslinked regions on both sides perpendicular to the main grid of the defective battery cell includes: The non-crosslinked regions on both sides of the defective battery cell perpendicular to the main grid are cut using pulsed laser cutting.

6. The photovoltaic module laser welding repair method according to claim 1, characterized in that, The step of cutting the non-crosslinked regions on both sides of the defective solar cell perpendicular to the main grid to increase the inter-cell spacing on both sides of the defective solar cell further includes: The material cut from the defective battery cell is sucked away.

7. The photovoltaic module laser welding repair method according to claim 1, characterized in that, The size of the repair film is compatible with the size of the battery cell to be replaced.

8. The photovoltaic module laser welding repair method according to any one of claims 1 to 7, characterized in that, Prior to the step of removing the solder strips from the defective battery cell, the method further includes: After laser welding of the entire sheet of cells on the front adhesive film, EL testing is performed on all the cells on the front adhesive film to identify the defective cells.

9. The photovoltaic module laser welding repair method according to claim 8, characterized in that, After placing a repair film at the location of the defective solar cell, a replacement solar cell is placed on the repair film, and the replacement solar cell is re-welded to the solder strip to complete the photovoltaic module repair step. The process further includes: The repaired photovoltaic module is subjected to EL testing again. If the defective cell is identified, the process returns to the step of removing the solder strips from the defective cell. If the defective cell is not identified, the photovoltaic module is considered repaired and is sent to the next process.

10. The photovoltaic module laser welding repair method according to claim 8, characterized in that, The step of cutting the non-crosslinked regions on both sides perpendicular to the main grid of the defective battery cell includes: The EL tester feeds back the position information of the defective battery cell on the front adhesive film to the laser cutting equipment; The photovoltaic module to be repaired is transported to the laser cutting equipment. The laser cutting equipment cuts the non-crosslinked areas on both sides of the defective cell that are perpendicular to the main grid, based on the position information of the defective cell on the front adhesive film and the position information of the photovoltaic module to be repaired on the laser cutting equipment.

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