Photovoltaic welding ribbon, standard parts, photovoltaic modules and repair methods thereof

Abstract

The present invention discloses a photovoltaic welding strip, a standard part, a photovoltaic module and a repair method thereof, wherein the photovoltaic welding strip is placed on the main grid of a battery cell, and extends from the left and right ends to connect several battery cells in series, wherein the welding strip comprises a welding rod body and several holes arranged in the welding strip body, wherein the holes are distributed at intervals between the battery cells connected in series; the present invention discloses a standard part, comprising a battery cell and the photovoltaic welding strip, wherein the number of battery cells contained in the standard part is one, two or more than two; the present invention further discloses a photovoltaic module, wherein the photovoltaic welding strip is used to connect several battery cells to form a photovoltaic module. The use of the photovoltaic welding strip not only improves the success rate of welding, but also avoids the increase of the resistance value of the photovoltaic module after repair, thereby improving the power generation efficiency and performance of the photovoltaic module.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic cells, and in particular to a photovoltaic welding strip and a standard part, a photovoltaic module and a repair method thereof. Background Art

[0002] With the development of solar photovoltaic cell and module technology, efficient photovoltaic modules are urgently needed. However, in the actual production process, some photovoltaic modules still need to be repaired manually for a second time.

[0003] The general method of repairing a battery module is to first heat the soldering tape with a soldering iron, and then simultaneously separate the soldering tape and each electrode on the battery cell. After all of them are removed, place the new battery cell in the position of the original bad cell, and then use the soldering iron to solder the soldering tape in sequence. As the number of battery main grid lines increases, the number of interconnection strips at the module end also increases, and the difficulty of using the above-mentioned repair method also increases. In addition, the battery cells are currently welded for the second time using solder pads spaced a certain distance apart, which significantly reduces the welding success rate. In severe cases, the soldering tape cannot be completely welded. In order to ensure successful welding, the soldering tape needs to overlap at the welding point in actual operation. The overlapping overlap method will increase the resistance and reduce the current here, seriously affecting the power generation efficiency and performance of the photovoltaic module.

[0004] Therefore, how to improve the repair efficiency of photovoltaic modules is a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the purpose of the present invention is to provide a photovoltaic welding strip, a standard part, a photovoltaic module and a repair method thereof, which not only improves the success rate of welding, avoids the increase of resistance value and the decrease of current of the photovoltaic module after repair, but also improves the power generation efficiency and performance of the photovoltaic module.

[0006] The first aspect of the present invention discloses a photovoltaic welding strip, which is placed on the main grid of a battery cell and extends at both left and right ends to connect a number of battery cells in series. The welding strip includes a welding strip body and a number of holes arranged in the welding strip body, and the holes are distributed at intervals between the battery cells connected in series.

[0007] Preferably, the holes on the photovoltaic welding strip are long strip structures, which are composed of an upper surface, an outer side surface, a lower surface and an inner side surface connected in sequence.

[0008] In some embodiments, the width of the solder strip body is 1.5-2 mm, and the width of the hole is 0.8-1 mm.

[0009] By arranging a plurality of holes at intervals on the photovoltaic welding strip, the resistance value of the welding strip can be reduced, thereby reducing the internal power loss.

[0010] The second aspect of the present invention discloses a standard component, which includes a battery cell and a photovoltaic welding strip as described above. The photovoltaic welding strip is placed on the main grid of the battery cell and extends along the left and right ends of the main grid of the battery cell. The holes are distributed at intervals at the left and right ends of the extension of the battery cell. The number of battery cells included in the standard component is one, two or more than two.

[0011] In some embodiments, the hole of the photovoltaic welding strip at the outer edge of the standard part is a closed structure formed by sequentially connecting the upper surface, the outer side surface, the lower surface and the inner side surface.

[0012] In some embodiments, the hole of the photovoltaic welding strip at the outer edge of the standard part is a semi-closed structure composed of an upper surface, an inner side surface and a lower surface connected in sequence.

[0013] By using the above-mentioned type of standard parts, it is only necessary to directly replace the bad battery cell with the standard parts and directly weld them at the cut part, which makes the rework convenient and quick, and effectively improves the success rate of welding.

[0014] A third aspect of the present invention discloses a photovoltaic module, which is formed by connecting a plurality of solar cells using the photovoltaic welding ribbon disclosed in the present invention.

[0015] A fourth aspect of the present invention discloses a method for repairing a photovoltaic module, comprising the following steps:

[0016] S01: Cut off the photovoltaic welding ribbons extending on both sides of the solar cell on the photovoltaic module to be replaced;

[0017] S02: Providing a battery cell to be replaced, wherein the battery cell to be replaced is a standard component disclosed in the second aspect of the present invention;

[0018] S03: The standard part to be replaced is placed at the cut position, and the outer side or inner side of the hole of the photovoltaic welding ribbon on the standard part is fully or partially aligned with the edge of the photovoltaic welding ribbon at the cut position.

[0019] In some embodiments, the photovoltaic module is the photovoltaic module disclosed in the third aspect of the present invention. In step S03: the outer side or inner side of the hole of the photovoltaic welding ribbon on the standard part is fully or partially aligned with the outer side or inner side of the hole of the photovoltaic welding ribbon at the cut position.

[0020] In some embodiments, the photovoltaic module is an existing photovoltaic module or a photovoltaic module disclosed in the third aspect of the present invention. In step S03: at least one hole on the outer edge of the photovoltaic welding strip on the standard part and the photovoltaic welding strip at the cut is a semi-closed structure, and the outer side edge of the photovoltaic welding strip on the standard part is aligned with the edge of the photovoltaic welding strip at the cut.

[0021] In the above-mentioned rework method, the overlapping area at the cut is small, which can avoid the generation of drum points in the subsequent lamination, and there are always holes at the overlapping parts, which can release the internal stress formed in the lamination, reduce the risk of hidden cracks in the battery cell, improve the yield rate, and reduce production costs.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the photovoltaic welding strip of the present invention;

[0024] Figure 2 It is a structural schematic diagram of an embodiment of the standard component of the present invention;

[0025] Figure 3 yes Figure 2 A magnified view of part A;

[0026] Figure 4 is a structural schematic diagram of another embodiment of the standard component of the present invention;

[0027] Figure 5 yes Figure 4 A magnified view of part B;

[0028] Figure 6 is a schematic structural diagram of an embodiment of a photovoltaic assembly of the present invention;

[0029] Figure 7 It is a schematic flow chart of an embodiment of a photovoltaic module repair method of the present invention;

[0030] Figure 8 is a schematic flow chart of another embodiment of a photovoltaic module repair method of the present invention;

[0031] Fig. 9 It is a schematic diagram of the cutting position of the photovoltaic module repair method of the present invention;

[0032] Fig.10 yes Fig. 9 A schematic diagram of the welding position of a portion C at the middle shearing position according to an embodiment;

[0033] Fig.11 yes Fig. 9 A schematic diagram of the welding position of another embodiment of the portion C at the middle shearing position;

[0034] Fig.12 yes Fig. 9 A schematic diagram of a welding position of a portion C at a middle shearing position according to another embodiment;

[0035] Fig.13 yes Fig. 9 A schematic diagram of a welding position of a portion C at a middle shearing position according to another embodiment;

[0036] Fig.14 yes Fig. 9 A schematic diagram of a welding position of a portion C at a middle shearing position according to another embodiment;

[0037] Fig.15 is a schematic flow chart of another embodiment of a photovoltaic module repair method of the present invention;

[0038] Fig.16 is a schematic diagram of a welding position at a shearing position in one embodiment of the present invention;

[0039] Fig.17 is a schematic diagram of a welding position at a shearing position in another embodiment of the present invention;

[0040] Fig.18 It is a schematic diagram of the welding position at the shearing position in another embodiment of the present invention.

[0041] Reference numerals:

[0042] 1. Photovoltaic welding ribbon,

[0043] 11. The main body of the welding strip,

[0044] 11a, upper surface, 11b, lower surface, 11c, outer side

[0045] 12. Holes,

[0046] 12a, upper surface, 12b, outer side surface, 12c, lower surface, 12d, inner side surface

[0047] 2. Battery cells,

[0048] 2a. Side

[0049] 10. Standard parts,

[0050] 100. Photovoltaic panels DETAILED DESCRIPTION

[0051] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0052] During the secondary repair of photovoltaic modules, it was found that even if the damaged cells were removed, the welding ribbons would need to be welded to the new cells one by one. On the one hand, a large number of welding ribbons need to be welded, and on the other hand, overlapping is required to ensure successful welding. The overlapping method is simple and convenient, but there are many hidden dangers, mainly including (1) the resistance at the overlapping part increases and the current decreases, which affects the power generation efficiency and performance of the photovoltaic module; (2) the thickness of the overlapping part is larger than that of the normal part, which will cause drums in the subsequent lamination, and in severe cases, it may cause hidden cracks in the cell.

[0053] In order to solve the above hidden dangers, the present invention discloses a photovoltaic welding ribbon, such as Figure 1 As shown, the photovoltaic welding strip 1 is placed on the main grid of the battery cell, and extends from the left and right ends to connect several battery cells in series. The photovoltaic welding strip includes a welding strip body 11 and several holes arranged in the welding strip body 11. The holes 12 are distributed between the above-mentioned series-connected battery cells.

[0054] A plurality of holes 12 are arranged at intervals on the photovoltaic welding ribbon 1, which greatly reduces the resistance value of the photovoltaic welding ribbon and reduces the internal power loss.

[0055] In some embodiments, the shape of the hole 12 can be various regular and irregular shapes, such as round, long strip, square in the middle and semicircular at both ends, etc. For the convenience of processing and manufacturing, the hole is generally rectangular, such as Figure 3 As shown, the hole is composed of an upper surface 12a, an outer side surface 12b, a lower surface 12c and an inner side surface 12d connected in sequence. Specifically, the upper surface 12a is the surface where the upper part of the hole 12 intersects with the electrode body 11, the outer side surface 12b is the surface where the side of the hole 12 away from the main grid direction intersects with the electrode body 11, the lower surface 12c is the surface where the lower part of the hole 12 intersects with the electrode body 11, and the inner side surface 12d is the surface where the side of the hole close to the main grid direction intersects with the electrode body 11.

[0056] like Figure 2 and 3 As shown, the width w of the hole 12 is not greater than the width of the welding rod body 11, and the length d of the hole 12 is not greater than the distance between adjacent battery cells. The existing processing technology can be used to open a plurality of holes on the welding strip.

[0057] In some implementations, the width w of the photovoltaic welding strip is 1.5-2 mm, and the width of the hole is 0.8-1 mm. The width w of the photovoltaic welding strip can be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, and the width of the hole can be 0.8 mm, 0.9 mm, 1.0 mm. Preferably, the above-mentioned hole is arranged at the middle position of the upper and lower surfaces of the welding strip body 11, so that the current flowing through the hole is divided into two currents of equal size, reducing the internal power loss. That is, during processing and preparation, if the distance between the upper surface 12a of the hole 12 and the upper surface 11a of the welding strip body 11 is equal to the distance between the lower surface 12c of the hole 12 and the lower surface 11b of the welding strip body 11, the hole 12 at the opening is located in the middle position of the welding rod body.

[0058] The present invention discloses a standard part, such as Figure 2-5 As shown, the standard part includes a cell 2 and a plurality of photovoltaic ribbons 1, and the photovoltaic ribbons 1 are placed on the main grid of the cell 2 and extend along the left and right ends of the main grid of the cell, and the holes 12 on the photovoltaic ribbons 1 are distributed at intervals at the left and right ends of the cell. The number of cells in the standard part is one, two or more. Figure 2 and Figure 4 As shown, the battery cell included in the standard part is a single piece. The standard parts containing a single battery cell are connected in series to form a standard part composed of two or more battery cells. It can be understood that no matter how many battery cells the standard part is composed of, the above-mentioned photovoltaic welding strips are placed on the main grid of the battery cell, and there are holes on the welding strips extending to the left and right of the outermost side of the standard part. Therefore, the subsequent repair of photovoltaic components can be carried out more simply and conveniently through the setting of standard parts.

[0059] The holes of the photovoltaic welding strip at the outer edge of the standard part can be set to different shapes. Specifically, they can be set to two different types of shapes. In some specific embodiments, for example Figure 3 As shown, the hole of the photovoltaic welding strip at the outer edge of one type of standard part is a closed structure composed of an upper surface 12a, an outer side surface 12b, a lower surface 12c and an inner side surface 12d connected in sequence, and the hole 12 is placed between the upper and lower surfaces 11a and 11b of the welding rod body 11. In other embodiments, such as Figure 5As shown, the hole of the photovoltaic welding strip on the outer edge of a type of standard part is a semi-enclosed structure composed of an upper surface 12a, an inner side surface 12d and a lower surface 12c connected in sequence. The shape of the hole 12 is a concave shape that is sunken into the inside of the welding rod body 11. Specifically, the hole 12 is placed between the upper and lower surfaces 11a and 11b of the welding rod body 11, and the inner side surface 12d of the hole 12 is placed outside the side 2a of the battery cell. The two outer side surfaces 11c of the welding rod body 11, one side surface 11c intersects with the upper surface 11a of the welding rod and the upper surface 12a of the hole, and the other side surface 11c intersects with the lower surface 11b of the welding rod 11 and the lower surface 12c of the hole 12. The d1 in the figure is the length of the hole 12 in this type of standard part, specifically 1 / 2-2 / 3 of the value of the original hole length d.

[0060] In the actual repair of photovoltaic modules, no matter which type of standard parts mentioned above is used, it is only necessary to directly replace the damaged solar cells with the standard parts, and overlap or lap weld the cut parts, so that the repair is convenient and quick.

[0061] The present invention discloses a photovoltaic assembly, comprising an assembly formed by connecting a plurality of battery cells 2 using the photovoltaic welding ribbon 1 disclosed in the present invention.

[0062] In some embodiments, see Figure 6 The photovoltaic module 100 includes a photovoltaic ribbon 1 and a cell 2, wherein the cell 2 includes a main grid, the photovoltaic ribbon 1 is placed on the main grid of the silicon wafer, and extends from the left and right ends to connect a plurality of cells in series, and a plurality of holes 12 on the photovoltaic ribbon 1 are distributed at intervals between the cells 2 connected in series. It can be understood that the spacing between adjacent holes can be set according to the length of the cell 2.

[0063] The photovoltaic module adopts a photovoltaic welding ribbon provided with holes, which reduces the resistance value of the welding ribbon, reduces internal losses, and improves the efficiency of the module.

[0064] The present invention also discloses a method for repairing a photovoltaic module, such as Figure 7 As shown, the following steps are included:

[0065] S01: Cut off the photovoltaic welding ribbons extending on both sides of the solar cell on the photovoltaic module to be replaced;

[0066] In this step, cut off the photovoltaic ribbons on the left and right sides of the cell on the photovoltaic module to be replaced, such as Fig. 9 As shown, in general, the length of the photovoltaic ribbon left on the photovoltaic module will be greater than the length of the cut photovoltaic ribbon. Preferably, the side of the photovoltaic ribbon at the cut is a flat side, such as Fig.10 , as shown in 11, so that the photovoltaic welding strips on the subsequent standard parts can be better aligned and the resistance can be made more uniform.

[0067] S02: Providing a battery cell to be replaced, wherein the battery cell to be replaced is a standard component with a semi-enclosed structure or a standard component with a closed structure having a hole on an outer edge;

[0068] In this step, the battery cell to be replaced is a standard component with a hole on the outer edge in a closed structure or a semi-closed structure. The structure of the standard component is specifically shown in Figure 2-5 As shown, the hole is a closed structure formed by connecting the upper surface 12a, the outer side surface 12b, the lower surface 12c and the inner side surface 12d in sequence, and the hole 12 is placed between the upper and lower surfaces 11a and 11b of the welding rod body 11. Or the hole is a semi-closed structure formed by connecting the upper surface 12a, the inner side surface 12d and the lower surface 12c in sequence. The shape of the hole 12 is a concave shape sunken into the inside of the welding rod body 11.

[0069] It is understandable that there is no order for step S01 and step S02, and they can be performed simultaneously, or step S01 can be performed first and step S02 can be performed later, or step S02 can be performed first and step S01 can be performed later, and this will not affect the operation of subsequent steps.

[0070] S03: placing the standard part to be replaced at the above-mentioned cutting position, and aligning the outer side or inner side of the hole of the photovoltaic welding ribbon on the standard part with the edge of the photovoltaic welding ribbon at the cutting position in whole or in part.

[0071] In this step, the standard part to be replaced is placed at the above-mentioned cutting position, such as Fig.10 As shown, if the hole is a closed structure, the outer side surface 12b of the hole is aligned with the edge of the photovoltaic welding strip at the cut position and overlapped. It can be understood that if the outer edge of the hole of the standard part is aligned with the edge of the cut position, there will be a hole at the overlap, which can not only reduce the resistance value of the welding strip and reduce internal losses, but also release the pressure at the overlap during the subsequent lamination process, thereby effectively reducing the hidden danger of hidden cracks in the battery cell. Fig.11 As shown, if the hole is an unclosed structure, the inner side surface 12d of the hole of the standard part completely or partially overlaps with the photovoltaic welding strip at the cut, that is, the inner side surface 12d of the hole of the standard part can be completely aligned with the edge of the cut; or the inner side surface 12d of the hole of the standard part can be partially aligned with the edge of the cut. Fig.10Or 11, the side of the welding strip at the cutting position on the photovoltaic module is a flat side, and the two side surfaces 11c of the outermost edge of the standard part are aligned with the upper and lower surfaces of the welding strip on the photovoltaic module and the upper and lower surfaces of the standard part. The two side surfaces 11c are overlapped and welded on the welding strip of the photovoltaic module, and the inner side surface 12d can be aligned or not aligned with the outer edge of the cutting position. In this way, not only can the resistance value of the welding strip be effectively reduced, and the internal loss can be reduced, but also the overlapping pressure can be released in the subsequent lamination process, thereby effectively reducing the hidden dangers of hidden cracks in the battery cell. Furthermore, in the repair process, by controlling the length of the outer photovoltaic welding strip of the standard part and the length of the welding strip at the cutting position, and only ensuring a certain alignment (all or part of the alignment method is acceptable), the distance between the battery cells of the photovoltaic module can be further guaranteed to be constant, so that the repaired photovoltaic module has a higher quality.

[0072] Furthermore, the present invention discloses a method for repairing a photovoltaic module, wherein the photovoltaic module is formed by connecting a plurality of cells with the photovoltaic welding strip disclosed in the present invention, wherein the photovoltaic welding strip comprises a welding strip body and a plurality of holes arranged in the welding strip body, wherein the holes are distributed at intervals between the cells connected in series. Figure 8 As shown, the rework method comprises the following steps:

[0073] S01: Cut off the photovoltaic welding ribbons extending on both sides of the battery cell on the photovoltaic module to be replaced, wherein the photovoltaic module uses a photovoltaic welding ribbon with holes;

[0074] In this step, the photovoltaic welding strips on the left and right sides of the cell on the photovoltaic module that needs to be replaced are cut, and the holes at the cut locations can be photovoltaic welding strips with a closed structure or photovoltaic welding strips with a semi-closed structure.

[0075] S02: providing a battery cell to be replaced, wherein the battery cell to be replaced is a standard component with a hole on an outer edge in a closed structure or a standard component in a semi-closed structure;

[0076] In this step, the battery cell to be replaced is a standard component with a closed hole on the outer edge and a standard component with a semi-closed structure. The structure of the standard component is specifically shown in Figure 2-5 As shown, the hole is a closed structure formed by connecting the upper surface 12a, the outer side surface 12b, the lower surface 12c and the inner side surface 12d in sequence, and the hole 12 is placed between the upper and lower surfaces 11a and 11b of the welding rod body 11. Or the hole is a semi-closed structure formed by connecting the upper surface 12a, the inner side surface 12d and the lower surface 12c in sequence. The shape of the hole 12 is a concave shape sunken into the inside of the welding rod body 11.

[0077] It is understandable that there is no order for step S01 and step S02, and they can be performed simultaneously, or step S01 can be performed first and step S02 can be performed later, or step S02 can be performed first and step S01 can be performed later, and this will not affect the operation of subsequent steps.

[0078] S03: Place the standard part to be replaced at the cut position, and align the outer side or inner side of the hole of the photovoltaic welding ribbon on the standard part with the outer side or inner side of the hole of the photovoltaic welding ribbon at the cut position in whole or in part.

[0079] In this step, the standard part to be replaced is placed at the above-mentioned cut-off point. Since the photovoltaic welding ribbon of the photovoltaic module is a photovoltaic module with holes, the outer edge of the cut-off point after it is cut has two main shapes, one is the hole of the closed structure, and the other is the hole of the semi-closed structure. Figure 3 and 5 As shown in the figure, the holes of standard parts are mainly of these two structures, so there are three ways to repair the solder strips, such as Figures 12 to 14 As shown. In the above three welding strip rework methods, the hole at the cut position overlaps or partially overlaps with the edge of the hole of the standard part, and can be aligned according to the inner side or outer side of the hole. Specifically, in the overlapping process, if the hole at the cut position is a closed structure and the hole of the standard part is a closed structure, the outer side of the hole at the cut position needs to cover the outer side of the standard part, and overlap or partially overlap with the inner side of the standard part; if the hole at the cut position is a closed structure and the hole of the standard part is a semi-closed structure, the outer side of the hole at the cut position can be aligned or partially aligned with the outer side 11c of the welding body, and overlap or partially overlap with the inner side of the standard part; if the hole at the cut position is a semi-closed structure and the hole of the standard part is a semi-closed structure, the inner side of the hole at the cut position can be aligned or partially aligned with the outer side 11c of the welding body, and the inner side of the hole at the cut position cannot overlap with the inner side of the standard part.

[0080] In the above two rework methods, holes exist at the overlapping welding positions at the cut points, which can release the internal stress formed in the lamination, avoid drum points in the lamination, reduce the risk of hidden cracks in the battery cells, and reduce production costs.

[0081] Furthermore, the present invention discloses a method for repairing a photovoltaic module, such as Fig.15 As shown, the rework method comprises the following steps:

[0082] S01: Cut off the photovoltaic welding ribbons extending on both sides of the cell on the photovoltaic module to be replaced, wherein the photovoltaic module is a module formed by connecting a plurality of cells using an existing photovoltaic welding ribbon or a photovoltaic welding ribbon with holes;

[0083] In this step, the photovoltaic module formed by using the existing photovoltaic welding strip is not described in detail, but the photovoltaic welding strip on the photovoltaic module of the present invention includes a welding strip body and a plurality of holes arranged in the welding strip body, and the holes are distributed between the battery cells connected in series at intervals;

[0084] S02: providing a battery cell to be replaced, wherein the battery cell to be replaced is a standard component with a hole on an outer edge in a closed structure or a standard component in a semi-closed structure;

[0085] In this step, the battery cell to be replaced is a standard component with a closed hole on the outer edge and a standard component with a semi-closed structure. The structure of the standard component is specifically shown in Figure 2-5 As shown, the hole is a closed structure formed by connecting the upper surface 12a, the outer side surface 12b, the lower surface 12c and the inner side surface 12d in sequence, and the hole 12 is placed between the upper and lower surfaces 11a and 11b of the welding rod body 11. Or the hole is a semi-closed structure formed by connecting the upper surface 12a, the inner side surface 12d and the lower surface 12c in sequence. The shape of the hole 12 is a concave shape sunken into the inside of the welding rod body 11.

[0086] It is understandable that there is no order for step S01 and step S02, and they can be performed simultaneously, or step S01 can be performed first and step S02 can be performed later, or step S02 can be performed first and step S01 can be performed later, and this will not affect the operation of subsequent steps.

[0087] S03: Place the standard part to be replaced at the cut position, and at least one hole on the outer edge of the photovoltaic welding strip on the standard part and the photovoltaic welding strip at the cut position is a semi-closed structure, and the outer side edge of the photovoltaic welding strip on the standard part is aligned with the edge of the photovoltaic welding strip at the cut position.

[0088] In this step, the standard part to be replaced is placed at the above-mentioned cut position. If at least one hole on the outer edge of the photovoltaic welding strip on the standard part and the photovoltaic welding strip at the cut position is a semi-closed structure, there are three ways to repair the welding strip, such as Figures 16 to 18As shown. In the above three welding strip rework methods, it is only necessary to align the outer side edge of the photovoltaic welding strip on the standard part with the edge of the photovoltaic welding strip at the cut. Specifically, during the butt welding process, if there is no hole at the cut or the hole is a closed structure, and the hole of the standard part is a semi-closed structure, the outer side edge of the cut is aligned with the outer side 11c of the welding body, and direct butt welding is performed, such as soldering; if the hole at the cut is a semi-closed structure, the hole of the standard part can be a semi-closed structure or a closed structure, then the outer side surface 11c of the welding strip body at the cut is fully aligned with the outer side surface 11C of the semi-closed structure hole of the standard part, or the outer side surface 11C of the welding strip body at the cut is aligned with the edge of the welding strip body of the standard part with a closed hole, and direct butt welding is performed. By directly aligning the edges of the standard parts and the cut parts, one or two closed holes will be formed at the cut parts. Metal materials are melted into the holes for welding. After welding, the welding strip is only as high as one welding strip. The welding area is large and the quality is good, which effectively reduces the contact resistance of the welding point. The key is that there is no overlap in the welding position. During the lamination process, the force on the cut part of the trimmer is consistent with that on other positions, which effectively reduces the hidden crack rate.

[0089] In a specific embodiment, the photovoltaic module is repaired using the traditional photovoltaic welding tape (without holes), and the welding tape is overlapped and lapped, and the hidden crack rate after lamination is about 3%; using the repair method of the present invention, the photovoltaic module is a traditional module (without holes), the standard part is a photovoltaic welding tape with a semi-closed structure on the outer edge, and butt welding is used (the outer edge of the standard part is aligned with the outer edge of the cut of the photovoltaic module, and tin soldering is performed), and the hidden crack rate after lamination is about 0.12%; it can be seen that the comparison between the two methods reduces the hidden crack rate by 96%.

[0090] In short, no matter which of the above repair methods is used, there will always be holes at the overlap position at the cut (whether it is overlapping lap welding or direct butt welding), which can effectively reduce the resistance value of the welding strip and reduce internal losses; if overlapping lap welding is used, the internal pressure formed in the lamination can be released in the hole, avoiding drum points in the lamination and reducing the risk of hidden cracks in the battery cell; if direct butt welding is used, the welding strip will only be one welding strip high after welding, effectively reducing the contact resistance at the welding point, and there is no overlap at the butt welding position. During the lamination process, the force at the cut of the recut is consistent with the force at other positions, effectively reducing the hidden crack rate. Furthermore, during the repair process, by controlling the length of the outer photovoltaic welding strip of the standard part and the length of the welding strip at the cut, and only needing to ensure a certain alignment (all or part of the alignment method is acceptable), the distance between the battery cells of the photovoltaic module can be further guaranteed to be constant, so that the repaired photovoltaic module has higher quality.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0092] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for repairing a photovoltaic module, characterized in that: The following steps are involved: S01: Cut off the photovoltaic welding ribbons extending on both sides of the solar cell on the photovoltaic module to be replaced; S02: Provide a cell to be replaced, wherein the cell to be replaced is a standard part; the standard part includes a cell and a photovoltaic welding strip, the photovoltaic welding strip includes a welding strip body and a plurality of holes arranged on the welding strip body, the photovoltaic welding strip is placed on the main grid of the cell, and extends along the left and right ends of the main grid of the cell, the holes are distributed at intervals at the left and right ends of the cell, and the number of cells included in the standard part is one, two, or more than two; S03: placing the standard part to be replaced at the cut position, and aligning the outer side or inner side of the hole of the photovoltaic welding strip on the standard part with the edge of the photovoltaic welding strip at the cut position in whole or in part.

2. The repair method according to claim 1, characterized in that: In step S03: the photovoltaic welding ribbon on the photovoltaic component to be replaced has a hole, and the outer side surface or inner side surface of the hole of the photovoltaic welding ribbon on the standard part is fully or partially aligned with the outer side surface or inner side surface of the hole of the photovoltaic welding ribbon at the cut point.

3. The repair method according to claim 1, characterized in that: In step S03: at least one hole on the outer edge of the photovoltaic welding strip on the standard part and the photovoltaic welding strip at the cut point is a semi-closed structure, and the outer side edge of the photovoltaic welding strip on the standard part is fully or partially aligned with the edge of the photovoltaic welding strip at the cut point.

4. The repair method according to claim 1, characterized in that: The hole is a long strip structure, which is composed of an upper surface, an outer side surface, a lower surface and an inner side surface connected in sequence.

5. The repair method according to claim 1, characterized in that: The width of the welding strip body is 1.5-2 mm, and the width of the hole is 0.8-1 mm.

6. The repair method according to claim 1, characterized in that: The hole of the photovoltaic welding strip at the outer edge of the standard part is a closed structure composed of an upper surface, an outer side surface, a lower surface and an inner side surface connected in sequence, or the hole of the photovoltaic welding strip at the outer edge of the standard part is a semi-closed structure composed of an upper surface, an inner side surface and a lower surface connected in sequence.

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