CN211455701U

CN211455701U - Photovoltaic solder strip and no main grid solar energy module thereof

Info

Publication number: CN211455701U
Application number: CN201921328080.8U
Authority: CN
Inventors: 林朝晖; 张超华; 王树林
Original assignee: Goldstone Fujian Energy Co Ltd
Current assignee: Goldstone Fujian Energy Co Ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2020-09-08
Anticipated expiration: 2029-08-16

Abstract

The utility model discloses a photovoltaic solder strip and no main grid solar module thereof, photovoltaic solder strip include circular low temperature solder strip body and the flat structure of a plurality of interval arrangement in the solder strip body, flat structure length is no longer than 20% of photovoltaic solder strip total length, and no main grid solar module is including the solar wafer that forms metal electrode, solar wafer carries out series connection welding through the photovoltaic solder strip, stacks up the lamination from bottom to top backplate, first hot melt adhesive, series connection welded solar wafer, second hot melt adhesive, front bezel in proper order and forms the module. The utility model discloses a photovoltaic solder strip can reduce battery silver thick liquid quantity by a wide margin, reduces the positive shading area of battery simultaneously, reduces the horizontal transmission distance of electric current to reduce the battery cost, improve the short-circuit current, reduce the series resistance of battery piece, promote module conversion efficiency, compatible very strong, especially adapted extensive mass production, more be favorable to making into flexible battery simultaneously.

Description

Photovoltaic solder strip and no main grid solar energy module thereof

Technical Field

The utility model relates to a brilliant silicon solar cell technical field especially relates to a photovoltaic solder strip and no main grid solar module thereof.

Background

The photovoltaic industry is rapidly developed under the energy crisis, and the key for further popularization of photovoltaic application is to improve the photoelectric conversion efficiency of the solar cell and reduce the manufacturing cost of the cell.

The front electrode of the conventional solar double-sided battery is provided with 3-6 main grid lines with the width of about 1mm, and the shading area of the front of the battery after welding with a welding strip accounts for about 3.5 percent of the total area of the battery. In order to reduce the shielding of the grid lines on the surface of the battery, the technology without the main grid battery becomes a research hotspot.

The existing battery without the main grid is to remove the main grid line on the front side of the solar battery, but because the contact point of the welding strip and the auxiliary grid line is small, the abnormal condition of insufficient welding or welding failure can easily occur, at present, a thin low-temperature welding strip is generally manufactured into a welding strip net, then the welding strip net is laid with the battery, hot melt adhesive, a front plate and a back plate, and finally, the pattern layer on the surface of the low-temperature welding strip is melted through lamination, so that the connection between the welding strip and the battery fine grid is realized.

However, the solder strip mesh is high in manufacturing cost, needs to be laid by specific equipment, basically has no compatibility with the existing series welding equipment for mass production, and is not suitable for large-scale mass production.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a photovoltaic solder strip and no main grid solar energy module thereof not only can improve module conversion efficiency, can also reduce battery cost by a wide margin, and very strong with present batch production equipment compatibility, especially adapted large-scale production.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: the utility model provides a photovoltaic solder strip, includes circular low temperature solder strip body and a plurality of interval arrangement flat structure in the solder strip body, flat structure length is no longer than 20% of photovoltaic solder strip total length.

Furthermore, the diameter of the welding strip body is 0.1-0.3 mm.

Furthermore, the length of the flat structure is 1-10mm, the width is 0.5-1.5mm, and the thickness is 0.05-0.15 mm.

Furthermore, at least one of alloys such as SnBi, SnBiAg, SnIn, SnPb, SnBiPb and the like is plated on the surface of the photovoltaic solder strip, the thickness is 5-20um, and the melting point of the alloy is less than 150 ℃.

The utility model provides an adopt no main grid solar module of photovoltaic solder strip which characterized in that: including the solar wafer that forms metal electrode, solar wafer carries out series welding through the photovoltaic solder strip, piles up the lamination with backplate, first hot melt adhesive, series connection welded solar wafer, second hot melt adhesive, front bezel from bottom to top in proper order and forms the module.

Furthermore, the solar cell is at least one of a crystalline silicon heterojunction cell, a PERC cell, a PERL cell, a PERT cell or a TOPCOM cell, and the solar cell is a whole cell or a cell cut into multiple equal parts.

Furthermore, the metal electrode of the solar cell piece comprises a plurality of metal fine grids and a plurality of main grids, the main grids are small sections of discontinuous main grids arranged at intervals, the length of each main grid is 1-5mm, the width of each main grid is 0.5-1.5mm, the metal main grids are arranged in 2-6 rows and 8-15 columns, the distance between the front fine grids of the solar cell piece is 1.5-3mm, and the distance between the back fine grids is 0.5-2 mm.

Further, the metal electrode is formed by silver paste screen printing, electroplating or 3D printing.

From the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:

the utility model discloses a photovoltaic solder strip can reduce battery silver thick liquid quantity by a wide margin, reduces the positive shading area of battery simultaneously, reduces the horizontal transmission distance of electric current to reduce the battery cost, improve the short-circuit current, reduce the series resistance of battery piece, promote module conversion efficiency, and very strong with the series connection welding equipment compatibility of present scale volume production, especially adapted extensive mass production, weld the area battery simultaneously with the conventionality and compare, the utility model discloses a very thin solder strip more is favorable to making into flexible battery.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

fig. 1 is a schematic structural view of a photovoltaic solder strip suitable for series welding of a whole battery according to embodiment 1 of the present invention;

fig. 2 is a schematic diagram of a matched battery electrode grid line structure in embodiment 1 of the present invention;

fig. 3 is a schematic structural view after series welding of embodiment 1 of the present invention;

fig. 4 is a schematic structural view of a solar cell forming a metal electrode according to the present invention;

fig. 5 is a schematic structural view of a photovoltaic solder strip suitable for series welding of half cells according to embodiment 2 of the present invention;

fig. 6 is a schematic diagram of a matched battery electrode grid line structure in embodiment 2 of the present invention;

fig. 7 is a schematic structural view after series welding of embodiment 2 of the present invention;

fig. 8 is a schematic structural view of the gridless solar module according to the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

As shown in fig. 1, a photovoltaic solder strip 14 suitable for series welding of a whole cell is provided, the photovoltaic solder strip 14 comprises a circular low-temperature solder strip body 1 and 5 flat structures 2 arranged in the solder strip body at intervals, the length of the flat structures is no more than 20% of the total length of the photovoltaic solder strip, the diameter D of the photovoltaic solder strip 14 is 0.26mm, the length L1 of the flat structures of the photovoltaic solder strip 14 is 1-3mm, the length L2 is 2mm, the length L3 is 8mm, the width W is 1mm, the thickness is 0.05mm, the surface of the solder strip 14 is plated with SnBiAg alloy, the thickness is 15um, and the melting point of the alloy is 138 ℃.

As shown in fig. 2 and 4, a solar cell 10 with a metal electrode formed thereon is provided, where the solar cell 10 is a crystalline silicon heterojunction cell, the metal electrode includes a plurality of metal fine grids 12 and a plurality of main grids 13, the main grids 13 are 3 small-segment main grids arranged at intervals, the main grids 13 have a length of 1-3mm and a width of 0.9mm, the metal main grids 13 are arranged in 3 rows and 12 columns, the pitch of the cell front fine grids 12 is 2.6mm, and the pitch of the cell back fine grids 12 is 1.2 mm; the metal electrode fine grid 12 and the main grid 13 are formed by a silver paste screen printing mode. As shown in fig. 3, the photovoltaic solder strips 14 are provided, and the photovoltaic solder strips 14 are used to connect the battery pieces 10 in series. As shown in fig. 8, a back plate 17, a first hot melt adhesive 15, the series-welded battery pieces 10, a second hot melt adhesive 16, and a front plate 18 were stacked in sequence, and were laminated to form a module at a laminating temperature of 150 ℃ for 20 minutes.

Example 2

Unlike example 1, as shown in fig. 5, a photovoltaic solder ribbon 14 suitable for series soldering of half cells 10 is provided, wherein the photovoltaic solder ribbon 14 comprises a circular low-temperature solder ribbon body 1 and 3 flat structures 2 arranged at intervals in the solder ribbon body, and the length of the flat structures is not more than 20% of the total length of the photovoltaic solder ribbon. As shown in fig. 6, a solar cell 10 suitable for being cut into half pieces is provided, wherein a metal electrode is formed, the metal electrode comprises a plurality of metal fine grids 12 and a plurality of main grids 13, the main grids 13 are 4 small-segment main grids arranged at intervals, and the metal main grids 13 are arranged in 4 rows and 12 columns. As shown in fig. 7, the photovoltaic solder strips 14 are provided, and the cell pieces 10 are connected in series by the photovoltaic solder strips 14.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A photovoltaic solder strip is characterized in that: the photovoltaic solder strip comprises a circular low-temperature solder strip body and a plurality of flat structures which are arranged in the solder strip body at intervals, wherein the length of each flat structure is not more than 20% of the total length of the photovoltaic solder strip.

2. The photovoltaic solder strip of claim 1, wherein: the diameter of the welding strip body is 0.1-0.3 mm.

3. The photovoltaic solder strip of claim 1, wherein: the flat structure has a length of 1-10mm, a width of 0.5-1.5mm and a thickness of 0.05-0.15 mm.

4. The photovoltaic solder strip of claim 1, wherein: at least one of alloys such as SnBi, SnBiAg, SnIn, SnPb and SnBiPb is plated on the surface of the photovoltaic solder strip, the thickness is 5-20um, and the melting point of the alloy is less than 150 ℃.

5. A solar module without a main grid using the photovoltaic solder ribbon of claim 1, wherein: including the solar wafer that forms metal electrode, solar wafer carries out series welding through the photovoltaic solder strip, piles up the lamination with backplate, first hot melt adhesive, series connection welded solar wafer, second hot melt adhesive, front bezel from bottom to top in proper order and forms the module.

6. The masterless solar module of claim 5, wherein: the solar cell slice is at least one of a crystalline silicon heterojunction cell, a PERC cell, a PERL cell, a PERT cell or a TOPCOM cell, and is a whole cell or a cell cut into multiple equal parts.

7. The masterless solar module of claim 5, wherein: the metal electrode of the solar cell piece comprises a plurality of metal fine grids and a plurality of main grids, the main grids are small sections of discontinuous main grids arranged at intervals, the length of each main grid is 1-5mm, the width of each main grid is 0.5-1.5mm, the metal main grids are arranged in 2-6 rows and 8-15 rows, the distance between the front fine grids of the solar cell piece is 1.5-3mm, and the distance between the back fine grids of the solar cell piece is 0.5-2 mm.

8. The masterless solar module of claim 5, wherein: the metal electrode is formed by screen printing silver paste, electroplating or 3D printing.