CN215815896U - Solar cell module - Google Patents
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- CN215815896U CN215815896U CN202121719526.7U CN202121719526U CN215815896U CN 215815896 U CN215815896 U CN 215815896U CN 202121719526 U CN202121719526 U CN 202121719526U CN 215815896 U CN215815896 U CN 215815896U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present application relates to a solar cell module, including: the solar cell comprises a solar cell piece, a plurality of auxiliary grid lines distributed on the surface of the solar cell piece, a first tin alloy layer coupled on the auxiliary grid lines, and a conductive composite film coupled on the first tin alloy layer, wherein the conductive composite film comprises a plurality of copper wires and a composite adhesive film arranged on the copper wires, a second tin alloy layer is coated on the surface of the copper wires, and the copper wires and the auxiliary grid lines are welded through the first tin alloy layer and the second tin alloy layer. This solar cell module adopts no main grid design, sets up first tin alloy layer on the secondary grid line, sets up second tin alloy layer on the copper wire surface, and at the lamination in-process, realizes the welding of copper wire and secondary grid line through two kinds of tin alloy layers, has improved the welding reliability of copper wire and secondary grid line, simultaneously, adopts the electrically conductive complex film that sets up the compound adhesive film formation on the copper wire, has improved the welding efficiency of copper wire and secondary grid line, further reduction solar cell module's manufacturing cost.
Description
Technical Field
The application relates to the technical field of solar cells, in particular to a solar cell module.
Background
After the solar cell is subjected to the processes of texturing, diffusion, PECVD and the like, a PN junction is formed, current can be generated under the irradiation of light, in order to lead out the generated current, metal grid lines for leading the photo-generated current in the cell to the outside of the cell need to be prepared on the surface of the solar cell, the prepared metal grid lines can shield a part of sunlight incident on the solar cell, and in order to obtain the highest photoelectric conversion efficiency, the structure of the cell needs to be designed in detail, particularly the metal grid lines on the solar cell.
The traditional screen printing solar cell uses silver as a material of a metal grid line, so that the cost of the solar cell is high; meanwhile, the width and the height-width ratio of the screen printing auxiliary grid are wide and small, so that electrode grid lines manufactured on the solar cell piece have large electrode loss including shading loss, resistance loss, composite loss and the like.
The auxiliary grid series resistance of the solar cell is inversely proportional to the square of the number of the main grids, in order to reduce the auxiliary grid series resistance, the main grid of the solar cell is changed from the original 5 main grids into 9 main grids, and the increase of the number of the main grids from the original 12 main grids allows the reduction of the cross-sectional area and the width of the auxiliary grids, so that the purposes of reducing the using amount of the auxiliary grid silver paste and reducing the shielding of the auxiliary grids on incident light are achieved.
With the progress of the technology, the swct (smart wire connection technology) or zero main grid technology removes the main grid in the solar cell electrode, thereby not only reducing the consumption of silver paste, but also improving the output power of the solar cell module and achieving the purposes of cost reduction and efficiency improvement. However, the assembly cannot realize the welding of the tinned copper wire and the auxiliary grid, and the tinned copper wire is only in physical contact with the auxiliary grid line of the solar cell in lamination directly, so that the problems of poor EL test performance, increased series resistance and large power attenuation after the assembly is aged after long-term outdoor work are caused.
SUMMERY OF THE UTILITY MODEL
The application provides a solar cell module to solve the problem that the auxiliary grid and the copper wire of the traditional solar cell without the main grid cannot be welded.
The technical scheme adopted by the application for solving the technical problems is as follows:
a solar cell module comprising: the solar cell comprises a solar cell piece, a plurality of secondary grid lines distributed on the surface of the solar cell piece, a first tin alloy layer coupled on the secondary grid lines, and a conductive composite film coupled on the first tin alloy layer, wherein the conductive composite film comprises a plurality of copper wires and a composite adhesive film arranged on the copper wires, a second tin alloy layer is coated on the surfaces of the copper wires, and the copper wires and the secondary grid lines are welded through the first tin alloy layer and the second tin alloy layer.
Further, the composition of the first tin alloy layer comprises one or more of tin, bismuth, silver, lead, indium, copper or zinc.
Further, the composition of the second tin alloy layer comprises one or more of tin, bismuth, silver, lead, indium, copper or zinc.
Further, the first tin alloy layer includes a continuous tin alloy layer and a discontinuous tin alloy layer.
Furthermore, the conductive composite film comprises an ipsilateral interconnected conductive composite film and a heterolateral interconnected conductive composite film.
Furthermore, the composite adhesive film comprises a double-layer composite adhesive film and a single-layer composite adhesive film.
Furthermore, the auxiliary grid lines are distributed in parallel, the copper wires are distributed in parallel, and the auxiliary grid lines and the copper wires are distributed vertically.
Further, the auxiliary grid line comprises one of a silver paste grid line, a silver aluminum paste grid line or a copper grid line.
Further, the solar cell comprises a double-sided electrode cell and a back contact electrode cell, the double-sided electrode cell comprises a PERC cell, an HJT cell and a TOPCon cell, and the back contact electrode cell comprises an IBC cell, a TBC cell and an HBC cell.
The technical scheme provided by the application comprises the following beneficial technical effects:
the application provides a solar cell module including: the solar cell comprises a solar cell piece, a plurality of auxiliary grid lines distributed on the surface of the solar cell piece, a first tin alloy layer coupled on the auxiliary grid lines, and a conductive composite film coupled on the first tin alloy layer, wherein the conductive composite film comprises a plurality of copper wires and a composite adhesive film arranged on the copper wires, a second tin alloy layer is coated on the surface of the copper wires, and the copper wires and the auxiliary grid lines are welded through the first tin alloy layer and the second tin alloy layer. This solar cell module adopts no main grid design, sets up first tin alloy layer on the secondary grid line, sets up second tin alloy layer on the copper wire surface, and at the lamination in-process, realizes the welding of copper wire and secondary grid line through two kinds of tin alloy layers, has improved the welding reliability of copper wire and secondary grid line, simultaneously, adopts the electrically conductive complex film that sets up the compound adhesive film formation on the copper wire, has improved the welding efficiency of copper wire and secondary grid line, further reduction solar cell module's manufacturing cost.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of a solar cell module obtained after electrodes are fabricated on a double-sided cell by a wave soldering and wicking process according to a first embodiment of the present disclosure;
fig. 2 is a schematic top view of a solar cell module obtained after an electrode is prepared on a back contact solar cell by a screen printing process according to a second embodiment of the present disclosure.
Description of reference numerals: 1-a copper wire; 2-double-sided battery secondary grid lines; 3-a continuous tin alloy layer; 4-double-sided solar cell slice; 5-back contact cell solar cell sheet; 6-back contact battery positive secondary grid line; 7-back contact battery negative electrode secondary grid line; 8-interrupted tin alloy layer; 9-composite glue film.
Detailed Description
To facilitate the description and understanding of the claimed subject matter, some concepts related to the present subject matter are first described below.
PERC (passivated Emitter and reader cell) is an Emitter and back passivation cell technology, and PERC cell is a high-efficiency advanced crystalline silicon photovoltaic cell structure.
The HJT (heterojunction) cell is a heterojunction cell, and is fully called a crystalline silicon heterojunction solar cell.
The TOPCon (tunnel Oxide passivation contacts) cell is a tunneling Oxide passivation contact cell.
The IBC (indirect back contact) cell is a back-junction back-contact solar cell structure in which positive and negative metal electrodes are arranged on the backlight surface of the cell in an interdigital mode.
HBC cells are interdigitated back contact heterojunction cells that combine the advantages of IBC cells and HJT cells.
The TBC cell is a solar cell based on a TOPCon passivation structure.
The technical solution of the present application is further explained below with reference to the accompanying drawings.
Referring to fig. 1, a schematic cross-sectional structure of a solar cell module obtained after electrodes are fabricated on a double-sided cell by a wave soldering and wicking process according to a first embodiment of the present disclosure.
The solar cell module in fig. 1 includes a plurality of double-sided solar cells 4, a secondary grid line 2, a continuous tin alloy layer 3 and a conductive composite film, wherein the conductive composite film includes a composite adhesive film 9 and a copper wire 1. The double-sided solar cell piece 4 is provided with auxiliary grid lines 2 on two surfaces, the double-sided solar cell piece 4 can select a PERC cell piece, an HJT cell, a TOPCon cell, an IBC cell, a TBC cell or an HBC cell, the auxiliary grid lines 2 can be silver paste grid lines, silver aluminum paste grid lines or copper grid lines, the auxiliary grid lines 2 are parallel to each other and are uniformly distributed on two surfaces of the double-sided solar cell piece 4 at equal intervals, each auxiliary grid line 2 is provided with a continuous tin alloy layer 3, the continuous tin alloy layer 3 can be made of one or more alloys of tin, bismuth, silver, lead, indium, copper or zinc, the melting point of the alloy is 80-180 ℃, the continuous tin alloy layer 3 can be prepared on the auxiliary grid lines 2 through a wave soldering tin immersion process, an ink jet printing process, a screen printing process or a transfer printing process and other preparation processes, the thickness of the continuous tin alloy layer 3 is 1-50 microns, by preparing the continuous tin alloy layer 3, on one hand, the continuous tin alloy layer 3 is used for replacing part of the auxiliary grid line 2, so that the consumable of the auxiliary grid line 2 can be reduced, and on the other hand, the continuous tin alloy layer 3 and the auxiliary grid line 2 jointly form the auxiliary grid line, so that the cross section area of the auxiliary grid line can be increased, the height-width ratio of the auxiliary grid line is improved, and the line resistance of the auxiliary grid line is reduced. The surface of a copper wire 1 in the conductive composite film is coated with a tin alloy layer, the material of the tin alloy layer on the surface of the copper wire 1 is completely the same as that of a continuous tin alloy layer 3, namely the tin alloy layer on the surface of the copper wire 1 is also selected from one or more of tin, bismuth, silver, lead, indium, copper or zinc, the melting point of the tin alloy layer is 80-180 ℃, and the copper wires 1 are parallel to each other and uniformly distributed on a composite adhesive film 9 for fixing the copper wires 1 at equal intervals.
According to the requirement, the same side of the copper wires 1 which can be all arranged on each composite adhesive film 9 forms the same-side interconnected conductive composite film. Or some compound glued membrane 9 sets up the one side at copper wire 1, the opposite side at copper wire 1 of the compound glued membrane 9 setting of another part, and the opposite position of the opposite side of copper wire 1 that is provided with compound glued membrane 9 does not set up compound glued membrane 9, namely, copper wire 1 sets up at every certain distance at the compound glued membrane 9 of the same one side of copper wire, the position that corresponds with every opposite side of interval that does not set up compound glued membrane 9 on copper wire 1 sets up compound glued membrane 9, form different side interconnection conductive composite film, wherein compound glued membrane includes double-deck compound glued membrane and the compound glued membrane of individual layer.
As shown in fig. 1, selecting a copper wire 1 with an interval on the same side, and arranging a composite film 9 on two sides of the composite film, and arranging a plurality of double-sided solar cells 4 with continuous tin alloy layers 3 prepared by a wave soldering tin immersion process at positions of the composite film on the copper wire 1 of the composite film on the different side where the composite film 9 is not arranged, that is, the part of the composite film on the different side with the copper wire 1 is arranged opposite to the continuous tin alloy layers 3 of the double-sided solar cells 4, the copper wire 1 is perpendicular to the continuous tin alloy layers 3, and each double-sided solar cell 4 is connected through the copper wire 1. The method comprises the steps of fixing a different-side interconnected conductive composite film and a double-sided solar cell piece 4 in a hot-pressing mode, namely, positioning a copper wire 1 and an auxiliary grid line 2, enabling a tin alloy layer coated on the surface of the copper wire 1 to be in contact with a continuous tin alloy layer 3 prepared on the surface of the auxiliary grid line 2, laminating the different-side interconnected conductive composite film provided with the double-sided solar cell piece 4, welding the tin alloy layer on the surface of the copper wire 1 and the continuous tin alloy layer 3 arranged on the upper surface of the auxiliary grid line 2 at the crossed position of the tin alloy layer and the continuous tin alloy layer 3 in the laminating process, namely, reliably welding the copper wire 1 and the auxiliary grid line 2, and packaging to obtain the solar cell assembly.
Referring to fig. 2, a schematic view of a solar cell module obtained after an electrode is prepared on a back contact solar cell by using a screen printing process according to a second embodiment of the present disclosure.
The solar cell module in fig. 2 comprises a plurality of back-contact cell solar cell pieces 5 only provided with secondary grid lines on the back surface, a back-contact cell positive electrode secondary grid line 6, a back-contact cell negative electrode secondary grid line 7, an interrupted tin alloy layer 8 and a conductive composite film formed by a copper wire 1 and a composite adhesive film 9, wherein the conductive composite film is an interconnection conductive composite film on the same side, the surface of the copper wire 1 is also coated with the tin alloy layer, and the material of the tin alloy layer on the surface of the copper wire 1 is completely the same as that of the interrupted tin alloy layer 8. Firstly, preparing a back contact battery anode secondary grid line 6 and a back contact battery cathode secondary grid line 7 on the back surface of a back contact battery solar cell piece 5, wherein the back contact battery anode secondary grid line 6 and the back contact battery cathode secondary grid line 7 are alternately arranged and are parallel to each other; then, printing tin paste on positions of two auxiliary grid lines crossed with the copper wire 1 by a screen printing process, wherein the length of the tin paste is 2 millimeters, the width of the tin paste is 150 micrometers, the thickness of a tin paste layer is 1-200 micrometers, and then, placing the back contact solar cell piece printed with the tin paste on a heating table or a reflow oven below 150 ℃ for drying and heat treatment to form discontinuous tin alloy layers 8 on the two auxiliary grid lines, wherein the discontinuous tin alloy layers 8 are arranged on the same auxiliary grid line at intervals, and the discontinuous tin alloy layers 8 on two adjacent auxiliary grid lines are staggered with each other, namely, in the two adjacent auxiliary grid lines, the position of one auxiliary grid line without the discontinuous tin alloy layer 8 corresponds to the position of the discontinuous tin alloy layer 8 on the adjacent auxiliary grid line, and the specific arrangement mode is shown in fig. 2; finally, laying the same-side interconnected conductive composite film containing 24 copper wires 1 with tin alloy layers coated on the surfaces thereof on the back of the back-contact solar cell piece 5, and carrying out hot pressing to fix the copper wires 1 and two auxiliary grid lines, wherein the copper wires 1 of the same-side interconnected conductive composite film are in contact with the interrupted tin alloy layers 8, the copper wires 1 are perpendicular to the auxiliary grid lines, and the back-contact solar cell piece 5 is provided with a back-contact battery anode auxiliary grid line 6 and an adjacent back-contact battery cathode auxiliary grid line 8, which are connected by the same copper wire 1, on the back-contact solar cell piece 5; and laminating, wherein the tin alloy layer coated on the surface of the copper wire 1 and the interrupted tin alloy layer 8 are welded in the laminating process, so that the two auxiliary grid lines are respectively welded with the copper wire 1, and then packaging is carried out to complete the preparation of the solar cell module.
The solar cell module obtained by the method provided by the second embodiment of the application is subjected to PL and EL detection, and the IV electrical performance is tested, wherein an intermittent tin alloy layer is not arranged on the secondary grid line of the solar cell module as a comparison group, and the copper wire is only in physical contact with the secondary grid line, but not welded.
TABLE 1 comparison of results after 200 TC cycles
| ModEff | FF | Isc | Voc | |
| Without preparing a discontinuous tin alloy layer | -5.80％ | -5.40％ | 0.60％ | 0.50％ |
| Preparation of interrupted tin alloy layer | -1.50％ | -1.20％ | 0.64％ | 0.34％ |
As can be seen from the data in table 1, the solar cell module obtained by the method of the second example of the present application has better test performance than the solar cell module without the discontinuous tin alloy layer after two hundred thermal cycles. According to the solar cell module provided by the embodiment of the application, the tin alloy layer is prepared on the auxiliary grid line, and after lamination, the copper wire 1 and the auxiliary grid line are welded, so that after two hundred times of thermal cycles, the efficiency and the fill factor are less attenuated, and the aging result is far superior to that of a solar cell module without the tin alloy layer.
The solar cell module that this application embodiment provided, set up continuous tin alloy layer 3 or interrupted tin alloy layer 8 through increasing on the auxiliary grid line, make copper wire 1 that the surface has the tin alloy layer can realize reliable welding with the auxiliary grid line at lamination in-process, rather than only physical contact, it is further, fix copper wire 1 according to predetermined mode with compound glued membrane 9, be convenient for fix a position and fix with the copper wire 1 that needs the welding together and auxiliary grid line is quick, thereby the welding efficiency of copper wire 1 with the auxiliary grid line has been improved. The obtained solar cell module is subjected to electrical property test, and the result shows that the solar cell module provided by the embodiment of the application has good electrical property, and can stably and reliably work outdoors for a long time.
Claims (9)
1. A solar cell module, comprising: the solar cell comprises a solar cell piece, a plurality of secondary grid lines distributed on the surface of the solar cell piece, a first tin alloy layer coupled on the secondary grid lines, and a conductive composite film coupled on the first tin alloy layer, wherein the conductive composite film comprises a plurality of copper wires and a composite adhesive film arranged on the copper wires, a second tin alloy layer is coated on the surfaces of the copper wires, and the copper wires and the secondary grid lines are welded through the first tin alloy layer and the second tin alloy layer.
2. The solar cell assembly of claim 1 wherein the composition of the first tin alloy layer comprises one or more of tin, bismuth, silver, lead, indium, copper, or zinc.
3. The solar cell assembly of claim 1 wherein the composition of the second tin alloy layer comprises one or more of tin, bismuth, silver, lead, indium, copper, or zinc.
4. The solar cell assembly of claim 1 wherein the first tin alloy layer comprises a continuous tin alloy layer and a discontinuous tin alloy layer.
5. The solar cell module according to claim 1, wherein the conductive composite film comprises a same-side interconnection conductive composite film and a different-side interconnection conductive composite film.
6. The solar cell module as claimed in claim 5, wherein the composite adhesive film comprises a double-layer composite adhesive film and a single-layer composite adhesive film.
7. The solar cell module as claimed in claim 1, wherein the sub-grid lines are arranged in parallel with each other, the copper wires are arranged in parallel with each other, and the sub-grid lines and the copper wires are arranged perpendicularly.
8. The solar cell module as claimed in claim 1, wherein the sub-grid lines comprise one of silver paste grid lines, silver aluminum paste grid lines or copper grid lines.
9. The solar cell module as claimed in claim 1, wherein the solar cell sheet comprises bifacial electrode cells including PERC cells, HJT cells, TOPCon cells and back contact electrode cells including IBC cells, TBC cells, HBC cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121719526.7U CN215815896U (en) | 2021-07-27 | 2021-07-27 | Solar cell module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121719526.7U CN215815896U (en) | 2021-07-27 | 2021-07-27 | Solar cell module |
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| CN215815896U true CN215815896U (en) | 2022-02-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220216357A1 (en) * | 2019-05-23 | 2022-07-07 | Alpha Assembly Solutions Inc. | Solder paste for module fabrication of solar cells |
| CN115295655A (en) * | 2022-10-08 | 2022-11-04 | 浙江制能科技有限公司 | IBC battery pack and manufacturing method thereof |
-
2021
- 2021-07-27 CN CN202121719526.7U patent/CN215815896U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220216357A1 (en) * | 2019-05-23 | 2022-07-07 | Alpha Assembly Solutions Inc. | Solder paste for module fabrication of solar cells |
| CN115295655A (en) * | 2022-10-08 | 2022-11-04 | 浙江制能科技有限公司 | IBC battery pack and manufacturing method thereof |
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