CN218241860U - Solar cell string - Google Patents
Solar cell string Download PDFInfo
- Publication number
- CN218241860U CN218241860U CN202222600270.9U CN202222600270U CN218241860U CN 218241860 U CN218241860 U CN 218241860U CN 202222600270 U CN202222600270 U CN 202222600270U CN 218241860 U CN218241860 U CN 218241860U
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- polygonal
- solar cell
- welding
- grid lines
- grid
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- 238000003466 welding Methods 0.000 claims abstract description 79
- 239000002184 metal Substances 0.000 claims abstract description 63
- 229910052751 metal Inorganic materials 0.000 claims abstract description 63
- 229910000679 solder Inorganic materials 0.000 claims abstract description 28
- 238000006073 displacement reaction Methods 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 239000010949 copper Substances 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 238000005476 soldering Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 7
- 239000011247 coating layer Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005219 brazing Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920006124 polyolefin elastomer Polymers 0.000 description 2
- -1 Polyethylene terephthalate Polymers 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Images
Abstract
The application discloses a solar cell string, which relates to the field of photovoltaics and comprises at least two solar cells and a solder strip for connecting two adjacent solar cells; the grid lines on the surface of the solar cell comprise a plurality of polygonal grid lines and a plurality of polygonal welding grid lines, and the polygonal welding grid lines are positioned at the edge of the solar cell and connected with the polygonal grid lines to serve as grid line welding ends; the welding strip comprises a plurality of metal strips distributed in a winding displacement mode, and at least one end of each metal strip is fixedly connected with the polygonal welding grid line. Grid line in this application includes polygon grid line and a plurality of polygon welding grid line, and the strap in the welding area is winding displacement formula and distributes, and the at least one end of strap is direct and the welding of polygon welding grid line. Because polygonal welding grid line is located solar cell's edge, so the solder strip need not to run through solar cell's surface, not only makes the solder strip reduce the shading area to solar cell piece to promote solar cell efficiency, but also makes solder strip length shorten, thereby reduces the welding cost.
Description
Technical Field
The application relates to the field of photovoltaics, in particular to a solar cell string.
Background
Two adjacent solar cells in the solar cell string are connected in series through a welding strip, a main grid and an auxiliary grid which are vertical and horizontal are distributed on the surface of each solar cell, and the welding strip is laid on the surface of each solar cell along the main grid. The solder strip runs through the whole surface of the solar cell, the length of the solder strip is longer, so that the welding cost is high, and meanwhile, the solder strip can occupy a certain effective light absorption area, so that the efficiency of the solar cell is reduced.
Therefore, how to solve the above technical problems should be a great concern to those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a solar cell cluster to promote solar cell efficiency, reduce welding cost.
In order to solve the technical problem, the application provides a solar cell string, which comprises at least two solar cells and a solder strip for connecting two adjacent solar cells;
the grid lines on the surface of the solar cell comprise a plurality of polygonal grid lines and a plurality of polygonal welding grid lines, wherein the polygonal welding grid lines are positioned at the edge of the solar cell, are connected with the polygonal grid lines and serve as grid line welding ends;
the welding strip comprises a plurality of metal strips distributed in a winding displacement mode, and at least one end of each metal strip is fixedly connected with the polygonal welding grid line.
Optionally, each metal strip is fixedly connected with the intersection position of two sides of the polygonal grid line.
Optionally, the method further includes:
the short grid lines are arranged in the middle of each polygonal welding grid line and connected with the polygonal welding grid lines;
and the crossed positions of the short grid lines and the polygonal welding grid lines are provided with fixedly connected metal strips.
Optionally, the polygonal grid lines include one or more of regular hexagonal grid lines, triangular grid lines and quadrilateral grid lines, and the polygonal welded grid lines include rectangular grid lines.
Optionally, the polygonal grid lines are distributed in a honeycomb shape.
Optionally, a blank area is left on the surface of the solar cell, and the grid lines are symmetrically distributed along the blank area.
Optionally, the method further includes:
the flexible insulating layers are wrapped on the outer surfaces of all the metal strips, the flexible insulating layers are in contact with the upper surface and the lower surface of the solar cell, and two ends of each metal strip are exposed out of the flexible insulating layers.
Optionally, the flexible insulating layer is a transparent flexible insulating layer.
Optionally, when the metal tape comprises a copper tape and an alloy plating layer located on the surface of the copper tape, two ends of the metal tape are directly connected with the polygonal welding grid line.
Optionally, when the metal tape is a copper tape, two ends of the metal tape are connected with the polygonal welding grid line through a conductive adhesive or a solder.
The solar cell string comprises at least two solar cells and a solder strip for connecting two adjacent solar cells; the grid lines on the surface of the solar cell comprise a plurality of polygonal grid lines and a plurality of polygonal welding grid lines, wherein the polygonal welding grid lines are positioned at the edge of the solar cell, are connected with the polygonal grid lines and serve as grid line welding ends; the welding strip comprises a plurality of metal strips distributed in a winding displacement mode, and at least one end of each metal strip is fixedly connected with the polygonal welding grid line.
Therefore, the grid lines of the solar cells in the solar cell string comprise the polygonal grid lines and the polygonal welding grid lines, the metal strips in the welding strips are distributed in a flat cable mode, and at least one end of each metal strip is directly welded with the polygonal welding grid lines. Because polygonal welding grid line is located solar cell's edge, so weld the area that the area need not to run through solar cell, weld the area that the area covers on solar cell and reduce for solar cell's light-absorbing area increases, thereby promote solar cell's efficiency, weld the area simultaneously and need not to run through solar cell's whole surface, still make to weld and take length to shorten, thereby reduce the welding cost.
Drawings
For a clearer explanation of the embodiments or technical solutions of the prior art of the present application, the drawings needed for the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view illustrating a solar cell soldering according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a local solar cell string soldering cross section provided in an embodiment of the present application;
fig. 3 is a schematic diagram of a front grid line of a solar cell according to an embodiment of the present disclosure;
fig. 4 is a schematic view of a solar cell grid line provided in an embodiment of the present application;
fig. 5 is a schematic view of another solar cell grid line provided in the present embodiment;
FIG. 6 is a top view of a solder strip provided in accordance with an embodiment of the present application;
FIG. 7 is a cross-sectional view of a solder strip provided in accordance with an embodiment of the present application;
fig. 8 is a schematic diagram of a grid line on the back side of the solar cell shown in fig. 3;
fig. 9 is a schematic diagram illustrating a solar cell three-segment design according to an embodiment of the present disclosure;
fig. 10 is a schematic view of a half cell provided in an embodiment of the present application;
in the figure, 1 is a solar cell, 2 is a solder strip, 3 is a conductive adhesive, 4 is a polygonal grid line, 5 is a polygonal solder grid line, 6 is a short grid line, 7 is a blank area, 21 is a flexible insulating layer, and 22 is a metal strip.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As described in the background section, the length of the solder strip in the current solar cell string is relatively long, which not only increases the soldering cost, but also reduces the efficiency of the solar cell because the solder strip occupies a certain effective light absorption area.
In view of the above, the present application provides a solar cell string, please refer to fig. 1 to fig. 7, which includes at least two solar cells 1 and solder strips 2 connecting two adjacent solar cells 1;
the grid lines on the surface of the solar cell 1 comprise a plurality of polygonal grid lines 4 and a plurality of polygonal welding grid lines 5, wherein the polygonal welding grid lines 5 are positioned at the edge of the solar cell 1, are connected with the polygonal grid lines 4 and serve as grid line welding ends;
the welding strip 2 comprises a plurality of metal strips 22 distributed in a row, and at least one end of each metal strip 22 is fixedly connected with the polygonal welding grid line 5.
The grid lines of the present application are located on the front and/or back side of the solar cell 1.
It can be understood that, when the grid lines in the present application are only disposed on one side of the solar cell 1, one end of the metal strip 22 is fixedly connected to the polygonal welding grid line 5; when the grid lines in the present application are simultaneously disposed on the front and back sides of the solar cell 1, the two ends of the metal tape 22 are respectively and fixedly connected to the polygonal welding grid lines 5.
All the polygonal gate lines 4 and the polygonal welding gate lines 5 are connected to each other. The number of the sides of the polygonal gate line 4 is three or more. The gate line width may be between 10 to 30 μm.
It should be noted that, in the present application, the specific shape of the polygonal gate line 4 is not limited, and may be set as practical. For example, the polygonal grid lines 4 include one or more of triangular grid lines, quadrangular grid lines, pentagonal grid lines and regular hexagonal grid lines, and the polygonal welded grid lines include rectangular grid lines.
Optionally, as an implementation manner, the polygonal gate lines 4 include regular hexagonal gate lines and incomplete regular hexagonal gate lines, and the polygonal welding gate lines 5 are connected to the regular hexagonal gate lines through the incomplete regular hexagonal gate lines, as shown in fig. 1 and fig. 3, and fig. 3 is a schematic diagram of a front gate line of a solar cell.
The number of the grid lines of each transverse row of the regular hexagon can be 10-50, and the current collection efficiency and the manufacturing cost are balanced.
Preferably, in order to reduce the laying density of grid lines, the polygonal grid lines (regular hexagonal grid lines) 4 are distributed in a honeycomb shape.
When the polygonal gate lines 4 only include triangular gate lines, the schematic layout of the gate lines on the solar cell 1 is shown in fig. 4, and when the polygonal gate lines 4 only include quadrilateral gate lines, the schematic layout of the gate lines on the solar cell 1 is shown in fig. 5. The polygonal solder grid lines 5 in fig. 1, 3 to 5 and 8 to 10 are shown in two rows.
For any two adjacent solar cells 1, one end of the solder strip 2 is fixedly connected to the front side of one solar cell 1, and the other end is fixedly connected to the back side of the other solar cell 1. The number of solar cells 1 in the string is not particularly limited in this application, as the case may be.
In order to reduce the stress of the solder strip 2 on the solar cell 1 and thereby reduce the probability of the solar cell 1 from being subfissure, the solar cell string further comprises:
the flexible insulating layer 21 is wrapped on the outer surface of all the metal strips, the flexible insulating layer 21 is in contact with the upper surface and the lower surface of the solar cell 1, and two ends of the metal strip 22 are exposed out of the flexible insulating layer 21.
As shown in fig. 2, except for the connection between the metal strip 22 and the grid line soldering terminal on the edge of the solar cell 1, the contact part between the solder strip 2 and the solar cell 1 is the flexible insulating layer 21.
The number of the metal strips 22 is large, and a plurality of the metal strips 22 are distributed along the length direction of the flexible insulating layer 21, as shown in fig. 6. Each metal band 22 is embedded in the flexible insulating layer 21, and the distance between the metal bands 22 is fixed, so that the welding strip 2 is more easily aligned with the grid line welding end during welding, and the yield is improved; in addition, the flexible insulating layer 21 has low hardness, and generates less stress to the solar cell 1, thereby reducing the probability of subfissure of the solar cell 1.
The cross-sectional view of the solder strip 2 is shown in fig. 7, in which a flexible insulating layer 21 is wrapped on the outer surface of a metal strip 22, and the length of the metal strip 22 is greater than the width of the flexible insulating layer 21. The width of the metal strip 22 may be 0.2 to 2mm, and the cross-sectional shape of the metal strip 22 may be rectangular, circular, or the like.
In order to improve the aesthetic property of the solar cell string, the flexible insulation layer 21 is a transparent flexible insulation layer 21, and the transparent flexible insulation layer 21 includes, but is not limited to, an EVA (ethylene-vinyl acetate copolymer) coating layer, a POE (polyolefin Elastomer) coating layer, and a PET (Polyethylene terephthalate) coating layer.
In the present application, the type of the metal strip 22 is not limited, and may be set by itself. For example, the metal strip 22 may be a pure copper strip, or the metal strip 22 may include a copper strip and an alloy coating on the surface of the copper strip, wherein the alloy coating may be an alloy such as SnBiAg, inSn, biSn, inp ag, or the like. The alloy coating can be only arranged in the region of the metal belt 22 exposed outside the flexible insulating layer 21, so that the consumption of alloy materials can be reduced, the manufacturing cost can be reduced, and the fixed connection with the grid line welding end on the solar cell 1 can be ensured.
The connection manner between the metal tape 22 and the gate line soldering terminal of the solar cell 1 is determined according to the type of the metal tape 22. When the metal band 22 comprises a copper band and an alloy coating layer positioned on the surface of the copper band, two ends of the metal band 22 are directly connected with the polygonal welding grid line 5, and the connection can be realized by directly heating the end part of the metal band 22 and the polygonal welding grid line 5. When the metal band 22 is a copper band, the two ends of the metal band 22 are connected with the polygonal welding grid lines 5 through the conductive adhesive 3 or the brazing filler metal, wherein when the metal band is connected through the conductive adhesive 3, the connection can be realized by heating and solidifying after the conductive adhesive 3 is laid, and when the low-temperature brazing filler metal is used, the connection can be realized by solidifying after melting.
The utility model provides a solar cell's in solar cell cluster grid line includes polygon grid line and a plurality of polygon welding grid line, welds the metal band in the area and is winding displacement formula distribution, and the both ends of metal band are direct to be welded with polygon welding grid line. Because polygonal welding grid line is located solar cell's edge, so weld the area that the area need not to run through solar cell, weld the area that the area covers on solar cell and reduce for solar cell's light-absorbing area increases, thereby promote solar cell's efficiency, weld the area simultaneously and need not to run through solar cell's whole surface, still make to weld and take length to shorten, thereby reduce the welding cost.
In order to facilitate cutting of the solar cell 1, a blank region 7 is left on the surface of the solar cell 1, and the grid lines are symmetrically distributed along the blank region 7, as shown in fig. 3, 4, 5, 8 and 9.
The number of the blank regions 7 on the solar cell 1 is set according to the requirement, for example, when half cells are required, the number of the blank regions 7 is one, as shown in fig. 3, fig. 4, fig. 5 and fig. 8, fig. 8 is a schematic diagram of a grid line on the back surface of the solar cell 1, and the schematic diagram of the obtained half cell is shown in fig. 8; when one third of the battery piece is needed, the number of the blank areas 7 is two, as shown in fig. 9; when a quarter of the battery piece is needed, the number of the blank areas 7 is three; when one fifth of the cell is needed, the number of the blank areas 7 is four, and so on.
When the number of the blank regions 7 is one, the polygonal welding grid lines 5 are arranged on the outer side of the solar cell 1 among the grid lines on the front side of the solar cell 1, as shown in fig. 3, the polygonal welding grid lines 5 are arranged on two sides of the blank regions 7 of the solar cell 1 among the grid lines on the back side of the solar cell 1, and the polygonal welding grid lines 5 are located on the edge of the cell after slicing, so that the connection of the front side and the back side of the solar cell 1 after slicing is facilitated.
When the grid lines include a plurality of polygonal grid lines 4 and a plurality of polygonal welding grid lines 5, the solar cell 1 is preferably a heterojunction cell having transparent oxide conductive films (TCO) on the front and back surfaces, and the TCO has an electron collecting capability and a better conductivity than a cell having no TCO.
On the basis of any one of the above embodiments, in an embodiment of the present application, each metal strap 22 is fixedly connected to the intersection position of two sides of the polygonal welding grid line 6.
Further, in an embodiment of the present application, the gate line of the solar cell string further includes:
the short grid lines 6 are arranged in the middle of each polygonal welding grid line 5 and connected with the polygonal welding grid lines 5;
the intersection of the short grid lines 6 and the polygonal welding grid lines 5 is provided with a fixedly connected metal strip 22.
Each metal strap 22 is fixedly connected with a half of the long side of the polygonal welding grid line 5, and the number of the metal straps 22 is equal to that of the short grid lines 6.
Referring to fig. 3, 4, 5, 7, 8 and 9, the short gate line 6 is equal to the short side of the polygonal welding gate line 5, the short gate line 6 divides the long side of the polygonal welding gate line 5 into two, and when the polygonal welding gate line 5 is welded to the welding strip 2, as shown in fig. 1, the metal strip 22 is only connected to one half of the long side of the polygonal welding gate line 5, and the connection length is shortened, so that the current on each welding strip 2 is reduced, and the current loss is reduced.
The following describes a process for manufacturing a battery string in a specific case.
Step 1: providing a heterojunction solar cell with TCO on the front surface and the back surface, wherein grid lines on the surface of the solar cell are shown in FIGS. 3 and 8;
and 2, step: cutting the solar cell along the central axis;
and step 3: paving conductive adhesive at short vertical lines of grid line welding ends on the front side and the back side of the solar cell;
and 4, step 4: connecting the front and back surfaces of adjacent cells by using a flat-line solder strip as shown in fig. 6;
and 5: and (5) repeating the step (3) and the step (4) to complete the connection of the preset number of the cell pieces and form the solar cell string.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The solar cell string provided by the present application is described in detail above. The principle and the embodiment of the present application are explained by applying specific examples, and the above description of the embodiments is only used to help understand the scheme and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. A solar cell string is characterized by comprising at least two solar cells and solder strips for connecting two adjacent solar cells;
the grid lines on the surface of the solar cell comprise a plurality of polygonal grid lines and a plurality of polygonal welding grid lines, wherein the polygonal welding grid lines are positioned at the edge of the solar cell, are connected with the polygonal grid lines and serve as grid line welding ends;
the welding strip comprises a plurality of metal strips distributed in a winding displacement mode, and at least one end of each metal strip is fixedly connected with the polygonal welding grid line.
2. The string of solar cells as claimed in claim 1, wherein each of the metal strips is fixedly connected to the intersection of two sides of the polygonal solder grid line.
3. The solar cell string according to claim 2, further comprising:
the short grid lines are arranged in the middle of each polygonal welding grid line and connected with the polygonal welding grid lines;
and a metal belt fixedly connected with the intersection position of the short grid line and the polygonal welding grid line.
4. The string of solar cells of claim 1, wherein the polygonal grid lines comprise one or more of regular hexagonal grid lines, triangular grid lines, and quadrilateral grid lines, and the polygonal solder grid lines comprise rectangular grid lines.
5. The string of solar cells of claim 4, wherein the polygonal gridlines are distributed in a honeycomb pattern.
6. The string of solar cells of claim 1, wherein the solar cells have a clear area on the surface thereof, and the grid lines are symmetrically distributed along the clear area.
7. The solar cell string according to claim 1, further comprising:
the flexible insulating layers are wrapped on the outer surfaces of all the metal strips, the flexible insulating layers are in contact with the upper surface and the lower surface of the solar cell, and two ends of each metal strip are exposed out of the flexible insulating layers.
8. The string of solar cells of claim 7, wherein the flexible insulating layer is a transparent flexible insulating layer.
9. The string according to any one of claims 1 to 8, wherein when the metal ribbon comprises a copper ribbon and an alloy coating on the surface of the copper ribbon, the two ends of the metal ribbon are directly connected to the polygonal solder grid lines.
10. The solar cell string according to any one of claims 1 to 8, wherein, when the metal tape is a copper tape, the two ends of the metal tape are connected with the polygonal soldering grid lines through a conductive adhesive or a solder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222600270.9U CN218241860U (en) | 2022-09-29 | 2022-09-29 | Solar cell string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222600270.9U CN218241860U (en) | 2022-09-29 | 2022-09-29 | Solar cell string |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218241860U true CN218241860U (en) | 2023-01-06 |
Family
ID=84667463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222600270.9U Active CN218241860U (en) | 2022-09-29 | 2022-09-29 | Solar cell string |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218241860U (en) |
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2022
- 2022-09-29 CN CN202222600270.9U patent/CN218241860U/en active Active
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Address after: 314400 No. 1 Jisheng Road, Jiaxing City, Zhejiang Province, Jianshan New District, Haining City Patentee after: Zhengtai Xinneng Technology Co.,Ltd. Address before: 314400 No. 1 Jisheng Road, Jiaxing City, Zhejiang Province, Jianshan New District, Haining City Patentee before: Zhengtai Xinneng Technology Co.,Ltd. |