阅读说明：本技术 光伏焊带、标准件、光伏组件及其返修方法 (Photovoltaic welding strip, standard component, photovoltaic module and repairing method thereof ) 是由 高慧慧 吴小秋 黄豪 阮新根 宋亮 甘胜泉 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种光伏焊带、标准件、光伏组件及其返修方法,所述光伏焊带置于电池片的主栅上,并左右两端延伸串联若干个电池片,所述焊带包括焊条主体及设置在所述焊带主体的若干个孔洞,所述孔洞间隔地分布在所述串联的电池片之间；本发明公开的一种标准件,包括电池片和上述的光伏焊带,所述标准件包含所述电池片的数量为一片、两片或两片以上；本发明又公开了一种光伏组件,采用上述光伏焊带连接若干个电池片而形成的光伏组件。采用上述光伏焊带,不仅提高焊接的成功率,能避免维修后光伏组件电阻值增大,提高光伏组件的发电效率及使用性能。(The invention discloses a photovoltaic welding strip, a standard component, a photovoltaic assembly and a repairing method thereof, wherein the photovoltaic welding strip is arranged on a main grid of a battery piece, the left end and the right end of the photovoltaic welding strip extend to be connected with a plurality of battery pieces in series, the welding strip comprises a welding rod main body and a plurality of holes arranged in the welding strip main body, and the holes are distributed among the battery pieces which are connected in series at intervals; the standard component comprises one, two or more than two battery pieces; the invention also discloses a photovoltaic module which is formed by connecting the photovoltaic welding strips with a plurality of battery pieces. By adopting the photovoltaic welding strip, the welding success rate is improved, the resistance value of the photovoltaic module can be prevented from being increased after maintenance, and the power generation efficiency and the service performance of the photovoltaic module are improved.)

1. The utility model provides a photovoltaic solder strip, photovoltaic solder strip arranges in on the main bars of battery piece to both ends extend to establish ties a plurality ofly about the battery piece, its characterized in that, solder strip is in including welding the area main part and setting a plurality of holes of welding the area main part, the hole interval ground distributes between the battery piece of establishing ties.

2. The photovoltaic solder strip of claim 1, wherein the holes are elongated structures and are formed by connecting an upper surface, an outer side surface, a lower surface and an inner side surface in sequence.

3. The photovoltaic solder strip of claim 1, wherein the solder strip body has a width of 1.5-2mm and the holes have a width of 0.8-1 mm.

4. A standard part, which is characterized in that the standard part comprises a cell and the photovoltaic welding strip as claimed in any one of claims 1 to 3, the photovoltaic welding strip is arranged on the main grid of the cell and extends along the left end and the right end of the main grid of the cell, the holes are distributed at intervals at the extending positions of the left end and the right end of the cell, and the standard part comprises one, two or more than two cells.

5. The standard of claim 4, wherein the hole of the photovoltaic solder strip on the outer edge of the standard is a closed structure formed by sequentially connecting an upper surface, an outer side surface, a lower surface and an inner side surface, or the hole of the photovoltaic solder strip on the outer edge of the standard is a semi-closed structure formed by sequentially connecting an upper surface, an inner side surface and a lower surface.

6. A photovoltaic module formed by connecting a plurality of said cells with the photovoltaic solder ribbon according to any one of claims 1 to 3.

7. The method for repairing the photovoltaic module is characterized by comprising the following steps of:

s01: cutting off photovoltaic welding strips at the left and right extending positions on two sides of a battery piece on the photovoltaic module to be replaced;

s02: providing a battery piece to be replaced, wherein the battery piece to be replaced is a standard part according to any one of claims 4 to 5;

s03: and placing the standard part to be replaced at the cut part, wherein the outer side surface or the inner side surface of the hole of the photovoltaic welding strip on the standard part is completely or partially aligned with the edge of the photovoltaic welding strip at the cut part.

8. A method of rework as recited in claim 7, wherein the photovoltaic module is the photovoltaic module of claim 7.

9. A rework method as recited in claim 8, wherein in step S03: and the outer side or inner side of the hole of the photovoltaic welding strip on the standard part is completely or partially aligned with the outer side or inner side of the hole of the photovoltaic welding strip at the cut part.

10. A rework method as recited in claim 7 or 8, wherein in step S03: the photovoltaic solder strip on the standard component and the hole on at least one outer side edge of the photovoltaic solder strip at the cut part are of semi-closed structures, and the edge of the outer side surface of the photovoltaic solder strip on the standard component is aligned with the edge of the photovoltaic solder strip at the cut part.

Technical Field

The invention relates to the technical field of photovoltaic cells, in particular to a photovoltaic welding strip, a standard component, a photovoltaic assembly and a repairing method thereof.

Background

With the development of solar photovoltaic cells and module technologies, high-efficiency photovoltaic modules are urgently needed. However, in the actual production process, a part of the photovoltaic modules still need to be manually repaired for the second time.

A general method for repairing battery assembly includes heating welding strip with soldering iron, separating welding strip from each electrode of battery plate, removing all the welding strips, putting new battery plate on original position of damaged plate, and soldering welding strips with soldering iron. Along with the increase of the number of the main grid lines of the battery, the number of the interconnection bars at the assembly end is increased, and the difficulty of adopting the repair method is increased. In addition, at present, the welding pads at certain intervals are adopted to perform secondary welding on the battery piece, so that the welding success rate is remarkably reduced, and if the welding success rate is serious, the welding strip cannot be completely welded. In order to ensure successful welding, in actual operation, welding strips need to be overlapped at a welding position, and the adoption of the overlapping mode can increase the resistance and reduce the current at the position, thereby seriously influencing the power generation efficiency and the service performance of the photovoltaic module.

Therefore, how to improve the repair efficiency of the photovoltaic module is a technical problem that needs to be solved urgently by those skilled in the art.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a photovoltaic welding strip, a standard component, a photovoltaic module and a repairing method thereof, which not only improve the success rate of welding, avoid the increase of the resistance value and the reduction of current of the photovoltaic module after repairing, but also improve the power generation efficiency and the service performance of the photovoltaic module.

The invention discloses a photovoltaic welding strip, which is arranged on a main grid of a cell, wherein the left end and the right end of the photovoltaic welding strip extend to be connected with a plurality of cells in series, the welding strip comprises a welding strip main body and a plurality of holes arranged on the welding strip main body, and the holes are distributed among the cells connected in series at intervals.

Preferably, the holes in the photovoltaic solder strip are of strip-shaped structures and are formed by sequentially connecting an upper surface, an outer side surface, a lower surface and an inner side surface.

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

Through set up a plurality of hole on above-mentioned photovoltaic solder strip at interval, the resistance value of reducible solder strip from this reduces the loss of internal power.

The invention discloses a standard component, which comprises a cell and the photovoltaic welding strips, wherein the photovoltaic welding strips are arranged on a main grid of the cell and extend along the left end and the right end of the main grid of the cell, holes are distributed at intervals at the extending positions of the left end and the right end of the cell, and the number of the cells contained in the standard component is one, two or more than two.

In some embodiments, the hole of the photovoltaic solder strip on the outer edge of the standard component is a closed structure formed by sequentially connecting an upper surface, an outer side surface, a lower surface and an inner side surface.

In some embodiments, the hole of the photovoltaic solder strip on the outer edge of the standard component is a semi-closed structure formed by sequentially connecting an upper surface, an inner side surface and a lower surface.

By adopting the standard part of the type, only the standard part needs to directly replace a bad battery piece, and the broken part is directly lapped and welded, so that the repair is convenient and fast, and the welding success rate is effectively improved.

The third aspect of the invention discloses a photovoltaic component which is formed by connecting a plurality of battery pieces by using a photovoltaic welding strip.

The fourth aspect of the invention discloses a method for repairing a photovoltaic module, which comprises the following steps:

s01: cutting off photovoltaic welding strips at the left and right extending positions on two sides of a battery piece on a photovoltaic module to be replaced;

s02: providing a battery piece to be replaced, wherein the battery piece to be replaced is a standard piece disclosed by the second aspect of the invention;

s03: and placing the standard part to be replaced at the cut part, wherein the outer side surface or the inner side surface of the hole of the photovoltaic welding strip on the standard part is completely or partially aligned with the edge of the photovoltaic welding strip at the cut part.

In some embodiments, the photovoltaic module is the photovoltaic module disclosed in the third aspect of the present invention, and in step S03: the outer side or inner side of the hole of the photovoltaic solder strip on the standard part is completely or partially aligned with the outer side or inner side of the hole of the photovoltaic solder strip at the cut part.

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

The repair method has the advantages that the lap joint area of the shearing part is small, the bulge point can be avoided in the subsequent lamination, the lap joint part is always provided with the holes, the internal stress formed in the lamination can be released, the risk of the hidden crack of the battery piece is reduced, the yield is improved, and the production cost is reduced.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a photovoltaic solder ribbon of the present invention;

FIG. 2 is a schematic structural view of one embodiment of a standard of the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is a schematic structural view of another embodiment of a standard of the present invention;

FIG. 5 is an enlarged view of portion B of FIG. 4;

FIG. 6 is a schematic structural view of one embodiment of a photovoltaic module of the present invention;

FIG. 7 is a schematic flow chart diagram of one embodiment of a method of reworking a photovoltaic module of the present invention;

fig. 8 is a schematic flow diagram of another embodiment of a method of reworking a photovoltaic module according to the present invention;

FIG. 9 is a schematic view of the position of the cut-off portion of the method of repairing a photovoltaic module according to the present invention;

FIG. 10 is a schematic view of a weld location of one embodiment of the portion of FIG. 9 at location C of the cutback;

FIG. 11 is a schematic view of the welding position of another embodiment of the portion C of FIG. 9 at cut-away;

FIG. 12 is a schematic view of a weld location of a further embodiment of the portion C of FIG. 9 at cut-away;

FIG. 13 is a schematic view of a weld location of yet another embodiment of the portion C of FIG. 9 at cut-away;

FIG. 14 is a schematic view of a weld location of a further embodiment of the portion C of FIG. 9 at cut-away;

FIG. 15 is a schematic flow chart diagram of yet another embodiment of a method of reworking a photovoltaic module of the present invention;

FIG. 16 is a schematic illustration of the weld location at the site of the snip in one embodiment of the invention;

FIG. 17 is a schematic view of a weld location at a snip location in another embodiment of the invention;

FIG. 18 is a schematic view of the weld location at the site of the snip in a further embodiment of the invention.

Reference numerals:

1. a photovoltaic solder strip is arranged on the substrate,

11. the main body of the welding strip is provided with a welding strip,

11a, upper surface, 11b, lower surface, 11c, lateral surface

12. The holes are arranged on the outer surface of the shell,

12a, an upper surface, 12b, a lateral surface, 12c, a lower surface, 12d, a medial surface

2. The number of the battery pieces is increased,

2a, side edge

10. The standard part is used for the standard part,

100. photovoltaic module

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the secondary repair of the photovoltaic module, even if a damaged cell is removed, when a new cell is welded in sequence, on one hand, a large number of welding strips need to be welded, and on the other hand, overlapping is needed at a welding position to ensure successful welding, the overlapping mode is simple and convenient, but a large number of hidden dangers exist, and the hidden dangers mainly comprise (1) the resistance of the overlapping position is increased, the current is reduced, and the power generation efficiency and the service performance of the photovoltaic module are influenced; (2) the thickness of the overlapped part is larger than that of the normal part, so that the overlapped part can generate a bump in the subsequent lamination, and the hidden crack of the battery piece can be caused seriously.

In order to solve the hidden troubles, the invention discloses a photovoltaic solder strip, as shown in fig. 1, the photovoltaic solder strip 1 is arranged on a main grid of a cell and extends from the left end to the right end to be connected with a plurality of cells in series, the photovoltaic solder strip comprises a solder strip main body 11 and a plurality of holes arranged on the solder strip main body 11, and the holes 12 are distributed among the cells connected in series at intervals.

The photovoltaic solder strip 1 is provided with a plurality of holes 12 at intervals, so that the resistance value of the photovoltaic solder strip is greatly reduced, and the loss of internal power is reduced.

In some embodiments, the shape of the holes 12 may be various regular and irregular shapes, such as a circle, a long bar, a square in the middle, and a semicircle at both ends. For the convenience of manufacturing, the holes are generally rectangular, and as shown in fig. 3, the holes are formed by connecting an upper surface 12a, an outer side surface 12b, a lower surface 12c and an inner side surface 12d in sequence. Specifically, the upper surface 12a is a surface where the upper portion of the hole 12 intersects with the electrode body 11, the outer side surface 12b is a surface where the side portion of the hole 12 away from the main grid direction intersects with the electrode body 11, the lower surface 12c is a surface where the lower portion of the hole 12 intersects with the electrode body 11, and the inner side surface 12d is a surface where the side portion of the hole close to the main grid direction intersects with the electrode body 11.

As shown in FIGS. 2 and 3, the width w of the hole 12 is not greater than the width of the electrode body 11, and the length d of the hole 12 is not greater than the distance between adjacent cells. The welding strip can be provided with a plurality of holes by adopting the existing processing technology.

In some embodiments, the width w of the photovoltaic solder strip is 1.5-2mm, the width of the hole is 0.8-1mm, the width w of the photovoltaic solder strip can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, and the width of the hole can be 0.8mm, 0.9mm, 1.0 mm. Preferably, the hole is formed at a middle position of the upper and lower surfaces of the solder ribbon body 11, so that the current flowing through the hole is divided into two equal currents, thereby reducing internal power loss. That is, when the upper surface 12a of the hole 12 is located at the same distance from the upper surface 11a of the strip body 11 as the lower surface 12c of the hole 12 is located at the lower surface 11b of the strip body 11 during the preparation, the hole 12 is located at the middle position of the electrode body.

The invention discloses a standard part, which comprises a cell 2 and a plurality of photovoltaic welding strips 1, wherein the photovoltaic welding strips 1 are arranged on a main grid of the cell 2 and extend along the left end and the right end of the main grid of the cell, and holes 12 on the photovoltaic welding strips 1 are distributed at the extending positions of the left end and the right end of the cell at intervals, as shown in figures 2-5. The number of the battery pieces in the standard component is one piece, two pieces or more than two pieces. As shown in fig. 2 and 4, the standard member includes a single cell, and the standard member including the single cell is connected in series to form a standard member including two or more cells. It can be understood that no matter how many cells the standard component is composed of, the photovoltaic solder strips are placed on the main grids of the cells, and holes are formed in the solder strips extending left and right on the outermost sides of the standard component. Therefore, the follow-up photovoltaic assembly can be repaired more simply and conveniently through the arrangement of the standard component.

In some specific embodiments, as shown in fig. 3, the holes of the photovoltaic solder strips on the outer side edge of one type of standard member are closed structures formed by sequentially connecting an upper surface 12a, an outer side surface 12b, a lower surface 12c and an inner side surface 12d, and the holes 12 are disposed between the upper surface 11a and the lower surface 11b of the welding rod main body 11. In other embodiments, as shown in fig. 5, the holes of the photovoltaic solder strips on the outer edge of one type of standard member are semi-closed structures formed by sequentially connecting an upper surface 12a, an inner side surface 12d and a lower surface 12 c. The shape of the hole 12 is concave recessed into the interior of the electrode body 11. Specifically, the hole 12 is disposed between the upper and lower surfaces 11a, 11b of the welding rod body 11, the inner side surface 12d of the hole 12 is disposed outside the side edge 2a of the battery piece, and two outer side surfaces 11c of the welding rod body 11, wherein 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, and d1 in the figure is the length of the hole 12 in the standard component of this type, specifically 1/2-2/3 of the value of the original hole length d.

In the repair of the actual photovoltaic module, no matter the standard component is adopted, the standard component only needs to directly replace a bad cell, and the cut part is subjected to stitch welding or lap welding, so that the repair is convenient and quick.

The invention discloses a photovoltaic module which comprises a module formed by connecting a plurality of battery pieces 2 by using a photovoltaic welding strip 1 disclosed by the invention.

In some embodiments, referring to fig. 6 in particular, the photovoltaic module 100 includes a photovoltaic solder strip 1 and a cell 2, wherein the cell 2 includes a main grid, the photovoltaic solder strip 1 is disposed on the main grid of the silicon wafer, and extends from the left end to the right end to connect in series a plurality of cells, and a plurality of holes 12 on the photovoltaic solder strip 1 are distributed at intervals between the cells 2 connected in series. It is understood that the distance between adjacent holes can be set according to the length of the battery piece 2.

This photovoltaic module adopts the photovoltaic solder strip that is provided with the hole, has reduced the resistance value of solder strip, has reduced the internal loss, has improved the subassembly efficiency.

The invention also discloses a method for repairing the photovoltaic module, which comprises the following steps as shown in fig. 7:

s01: cutting off photovoltaic welding strips at the left and right extending positions on two sides of a battery piece on a photovoltaic module to be replaced;

in this step, the photovoltaic solder strips on the left and right sides of the cell piece on the photovoltaic module to be replaced are cut off, as shown in fig. 9, in general, the length of the photovoltaic solder strip left on the photovoltaic module is greater than the length of the cut photovoltaic solder strip, and preferably, the side surfaces of the photovoltaic solder strips at the cut-off position are parallel and level side surfaces, as shown in fig. 10 and 11, so that the photovoltaic solder strips on the subsequent standard component can be aligned better, and the resistance is more uniform.

S02: providing a battery piece to be replaced, wherein the hole on the outer edge of the battery piece to be replaced is a semi-closed structure standard piece or a closed structure standard piece;

in this step, the battery piece to be replaced is a standard piece having a closed structure or a semi-closed structure with a hole at the outer edge, the structure of the standard piece is specifically shown in fig. 2-5, the hole is a closed structure formed by sequentially connecting an upper surface 12a, an outer side surface 12b, a lower surface 12c and an inner side surface 12d, and the hole 12 is disposed 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 sequentially connecting an upper surface 12a, an inner side surface 12d and a lower surface 12 c. The shape of the hole 12 is concave recessed into the interior of the electrode body 11.

It is understood that the steps S01 and S02 are not sequentially divided, and may be simultaneous, or the steps S01 may precede the steps S02 may follow, or the steps S02 may precede the steps S01 may follow, which does not affect the operation of the subsequent steps.

S03: and placing the standard part to be replaced at the cut part, wherein the outer side surface or the inner side surface of the hole of the photovoltaic welding strip on the standard part is completely or partially aligned with the edge of the photovoltaic welding strip at the cut part.

In this step, the standard component to be replaced is placed at the cut position, as shown in fig. 10, if the hole is a closed structure, the outer side surface 12b of the hole is aligned with part of the edge of the photovoltaic solder strip at the cut position, and stitch welding is performed. It can be understood that the outer edge of the hole of the standard part is aligned with the edge of the part at the cutting position, and the hole exists at the overlapping position, so that the resistance value of the welding strip can be reduced, the internal loss can be reduced, the pressure at the overlapping position can be released in the subsequent laminating process, and the hidden danger of the hidden crack of the battery piece can be effectively reduced. As shown in fig. 11, if the hole is an unsealed structure, all or part of the inner side surface 12d of the hole of the standard member coincides with the photovoltaic solder strip at the cut position, that is, the inner side surface 12d of the hole of the standard member may coincide with the edge of the cut position completely; or the inner side 12d of the standard hole may be aligned coincident with the edge portion at the cut. In summary, referring specifically to fig. 10 or 11, the side of the solder ribbon at the cut position on the photovoltaic module is a flat side, and two side surfaces 11c at the outermost edges of the standard component align the upper and lower surfaces of the solder ribbon on the photovoltaic module with the upper and lower surfaces of the standard component, the two side surfaces 11c are overlapped and welded on the solder ribbon of the photovoltaic module, and the inner side surface 12d may be aligned with or not aligned with the outer edges of the cut position. Therefore, the resistance value of the welding strip can be effectively reduced, the internal loss is reduced, and the overlapped pressure can be released in the subsequent lamination process, so that the hidden danger of hidden cracking of the battery piece is effectively reduced. Furthermore, in the repair process, the distance between the photovoltaic module cell and the photovoltaic module cell can be further ensured to be constant by controlling the length of the photovoltaic welding strip on the outer side of the standard part and the length of the welding strip at the cut part and only ensuring certain alignment (all or part of the alignment mode), so that the repaired photovoltaic module has higher quality.

The photovoltaic module is formed by connecting the photovoltaic welding strip disclosed by the invention with a plurality of battery pieces, the photovoltaic welding strip comprises a welding strip main body and a plurality of holes arranged in the welding strip main body, and the holes are distributed among the battery pieces connected in series at intervals. As shown in fig. 8, the rework method includes the following steps:

s01: cutting off photovoltaic welding strips at the left and right extending positions on two sides of a battery piece on the photovoltaic module to be replaced, wherein the photovoltaic module adopts the photovoltaic welding strips with holes;

in the step, the photovoltaic welding strips on the left side and the right side of the cell piece on the photovoltaic module to be replaced are cut off, and the holes at the cut-off positions can be photovoltaic welding strips with a closed structure or photovoltaic welding strips with a semi-closed structure.

S02: providing a battery piece to be replaced, wherein the battery piece to be replaced is a standard piece with a closed structure or a standard piece with a semi-closed structure of a hole on the outer edge;

in this step, the battery piece to be replaced is a standard piece with a closed structure and a standard piece with a semi-closed structure, the structure of the standard piece is specifically shown in fig. 2-5, the hole is a closed structure formed by sequentially connecting an upper surface 12a, an outer side surface 12b, a lower surface 12c and an inner side surface 12d, and the hole 12 is disposed between the upper surface 11a and the lower surface 11b of the welding rod main body 11. Or the hole is a semi-closed structure formed by sequentially connecting an upper surface 12a, an inner side surface 12d and a lower surface 12 c. The shape of the hole 12 is concave recessed into the interior of the electrode body 11.

It is understood that the steps S01 and S02 are not sequentially divided, and may be simultaneous, or the steps S01 may precede the steps S02 may follow, or the steps S02 may precede the steps S01 may follow, which does not affect the operation of the subsequent steps.

S03: and placing the standard part to be replaced at the cut part, wherein the outer side surface or the inner side surface of the hole of the photovoltaic welding strip on the standard part is completely or partially aligned with the outer side surface or the inner side surface of the hole of the photovoltaic welding strip at the cut part.

In the step, the standard component to be replaced is placed at the cut part, and because the photovoltaic welding strip of the photovoltaic component is a photovoltaic component with a hole, the outer edge of the cut part after cutting mainly has two shapes, namely the hole of the sealing mechanism and the hole of the semi-sealing structure. As shown in fig. 3 and 5, and the holes of the standard are mainly of the two structures, there are three repair modes of the solder strip, as shown in fig. 12 to 14. In the three welding strip repair methods, the hole at the cut part is overlapped or partially overlapped with the edge of the hole of the standard part, and can be aligned according to the inner side surface or the outer side surface of the hole, specifically, in the overlapping process, if the hole at the cut part is of a closed structure and the hole of the standard part is of a closed structure, the outer side surface of the hole at the cut part needs to cover the outer side surface of the standard part and is overlapped or partially overlapped with the inner side surface of the standard part; if the hole at the cut part is of a closed structure and the hole of the standard part is of a semi-closed structure, the outer side surface of the hole at the cut part can be aligned or partially aligned with the outer side surface 11c of the welding body and is overlapped or partially overlapped with the inner side surface of the standard part; if the hole at the cut part is of a semi-closed structure and the hole of the standard part is of a semi-closed structure, the inner side surface of the hole at the cut part can be aligned with or partially aligned with the outer side surface 11c of the welding body, and the inner side surface of the hole at the cut part cannot be coincided with the inner side surface of the standard part.

According to the two repairing methods, the holes are formed in the overlapped welding positions of the cut parts, so that internal stress formed in lamination can be released, the generation of bulge points in lamination is avoided, the risk of hidden cracking of the battery piece is reduced, and the production cost is reduced.

Further, the invention discloses a method for repairing a photovoltaic module, as shown in fig. 15, the method comprises the following steps:

s01: cutting off photovoltaic welding strips at the left and right extending positions on two sides of a cell piece on a photovoltaic module to be replaced, wherein the photovoltaic module is formed by connecting a plurality of cell pieces by using the existing photovoltaic welding strips or the photovoltaic welding strips with holes;

in this step, the photovoltaic module formed by using the existing photovoltaic solder strip is not described in detail, but by using the photovoltaic module of the present invention, the photovoltaic solder strip thereon includes a solder strip main body and a plurality of holes arranged in the solder strip main body, and the holes are distributed at intervals between the cells connected in series;

s02: providing a battery piece to be replaced, wherein the battery piece to be replaced is a standard piece with a closed structure or a standard piece with a semi-closed structure of a hole on the outer edge;

in this step, the battery piece to be replaced is a standard piece with a closed structure and a standard piece with a semi-closed structure, the structure of the standard piece is specifically shown in fig. 2-5, the hole is a closed structure formed by sequentially connecting an upper surface 12a, an outer side surface 12b, a lower surface 12c and an inner side surface 12d, and the hole 12 is disposed between the upper surface 11a and the lower surface 11b of the welding rod main body 11. Or the hole is a semi-closed structure formed by sequentially connecting an upper surface 12a, an inner side surface 12d and a lower surface 12 c. The shape of the hole 12 is concave recessed into the interior of the electrode body 11.

It is understood that the steps S01 and S02 are not sequentially divided, and may be simultaneous, or the steps S01 may precede the steps S02 may follow, or the steps S02 may precede the steps S01 may follow, which does not affect the operation of the subsequent steps.

S03: the standard part to be replaced is placed at the cut-off position, the photovoltaic welding strip on the standard part and the hole in at least one outer side edge of the photovoltaic welding strip at the cut-off position are of a semi-closed structure, and the edge of the outer side face of the photovoltaic welding strip on the standard part is aligned with the edge of the photovoltaic welding strip at the cut-off position.

In this step, the standard component to be replaced is placed at the cut-off position, and at least one hole on the outer edge of the photovoltaic solder strip on the standard component and the photovoltaic solder strip at the cut-off position is of a semi-closed structure, so that three solder strip repair modes exist, as shown in fig. 16 to 18. In the three repair modes of the welding strip, the condition that the edge of the outer side surface of the photovoltaic welding strip on the standard part is aligned with the edge of the photovoltaic welding strip at the cut part is only required to be met. Specifically, in the butt welding process, if no hole or a hole is in a closed structure at the cut part and the hole of the standard part is in a semi-closed structure, the edge of the outer side surface of the cut part is aligned with the outer side surface 11c of the welding body, and butt welding is directly performed, for example, soldering can be adopted; if the hole at the cut part is of a semi-closed structure and the hole of the standard part can be of a semi-closed structure or a closed structure, the outer side surface 11C of the welding strip main body at the cut part is completely aligned with the outer side surface 11C of the hole of the semi-closed structure of the standard part, or the outer side surface 11C of the welding strip main body at the cut part is aligned with the edge of the welding strip main body of the standard part with the hole of the closed structure, and the welding is directly performed in a butt welding mode. The edges of the standard part and the cut part are directly aligned, one or two closed holes are formed in the cut part in a butt joint mode, metal materials are fused into the holes for welding, the height of only one welding strip is increased after welding, the welding area is large, the quality is good, the contact resistance of the welded part is effectively reduced, the key point is that the welding positions are not overlapped, the stress of the repaired cut part is consistent with the stress of other positions in the laminating process, and the hidden crack rate is effectively reduced.

In a specific embodiment, a photovoltaic welding strip (without holes) in the traditional technology is adopted for repairing a photovoltaic module, overlapping welding is carried out at the welding strip, and the hidden crack rate after lamination is about 3%; by adopting the repair method, the photovoltaic module is a traditional module (without holes), the standard component is a photovoltaic welding strip with the outer edge of a semi-closed structure, butt welding is adopted (the outer edge of the standard component is aligned with the outer edge of the cut part of the photovoltaic module and is soldered), and the subfissure rate after lamination is about 0.12%; therefore, the subfissure rate is reduced by 96% by comparing the two methods.

In a word, no matter which repair method is adopted, holes always exist in the lap joint position (no matter overlap welding or direct butt welding) of the cut part, so that the resistance value of a welding strip can be effectively reduced, and the internal loss is reduced; if overlap welding is adopted, the holes can release internal pressure formed in lamination, so that bulging points generated in lamination are avoided, and the risk of hidden cracking of the battery pieces is reduced; if direct butt welding is adopted, the height of only one welding strip is left after welding, the contact resistance of a welding position is effectively reduced, the butt welding positions are not overlapped, the stress of the repair shearing position is consistent with that of other positions in the laminating process, and the hidden crack rate is effectively reduced. Furthermore, in the repair process, the distance between the photovoltaic module cell and the photovoltaic module cell can be further ensured to be constant by controlling the length of the photovoltaic welding strip on the outer side of the standard part and the length of the welding strip at the cut part and only ensuring certain alignment (all or part of the alignment mode), so that the repaired photovoltaic module has higher quality.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.