Solar cell module electroplated with copper grid lines and preparation method of solar cell module

Abstract

The invention provides a solar cell module electroplated with copper grid lines and a preparation method thereof, and the method comprises the following steps: fixing a welding strip, and fixing the welding strip on a main grid of a cell piece; connecting a plurality of battery pieces to form a battery string, and covering the battery string with a POE film and a cover plate in sequence; and lamination is carried out, and the welding strip and the main grid are attached together. The solar cell has the advantages that the main grid lines on the cell pieces are the copper grid lines and are formed through copper electroplating, the welding strips are the copper welding strips, and the welding strips and the main grids are fixed through the fixing glue, so that the welding strips and the main grids are in direct copper-copper contact, interface resistance in the current transmission process can be reduced, Rs of an assembly can be improved, and the power of the assembly can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of solar cells, and in particular relates to a solar cell module with electroplated copper grid lines and a preparation method thereof. Background Art

[0002] At present, during the process of manufacturing photovoltaic cells into modules, the series welding process is generally adopted. There are metal electrodes on the surface of photovoltaic cells. The positive and negative electrodes of the cells are connected in series by welding, and then a POE film is laid to protect the cells. Finally, glass is covered and high-temperature lamination is carried out to ensure that the cells in the module are not polluted by the environment.

[0003] In the production of existing modules, the series welding method is used. A solder tape with a tin-coated copper structure is used to connect the positive and negative electrodes of the cells. At the same time, a high-temperature method (200 - 350 °C) is used to weld the solder tape on the surface of the cells. When using the existing solder tape for welding, the welding process requires high temperature, which will damage the electrical performance of the cells; the existing solder tape uses a tin-coated copper structure, and the cells have copper grid lines. During the process of collecting current, the current needs to go from copper to tin and then to copper. Due to the interface resistance between metals, the Rs of the module increases, affecting the output power; during the high-temperature welding process, consumables such as solder tape and flux are required, and the welding cost is high. Summary of the Invention

[0004] In view of the above problems, the present invention provides a solar cell module with electroplated copper grid lines and a preparation method thereof to solve the above or other previous problems existing in the prior art.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a preparation method of a solar cell module with electroplated copper grid lines, including the following steps:

[0006] Fix the solder tape and fix the solder tape on the main grid of the cell;

[0007] Connect multiple cells to form a cell string, and sequentially cover the POE film and the cover plate;

[0008] Carry out lamination to bond the solder tape and the main grid together.

[0009] Further, the solder tape is a copper solder tape.

[0010] Further, the main grid is a copper grid line.

[0011] Further, when carrying out lamination, the lamination temperature is 120 - 180 °C.

[0012] Further, when carrying out lamination, the POE film melts due to heat and fixes the solder tape and the main grid.

[0013] Furthermore, the welding tape and the main grid are fixed by fixing glue.

[0014] Furthermore, the fixing glue is tape, glue or UV glue.

[0015] A solar cell module with electroplated copper grid lines includes a plurality of cell pieces. The plurality of cell pieces are connected by welding tapes. The welding tapes are in contact with the main grids of the cell pieces and are fixed by bonding. The outside of the cell pieces is wrapped with a POE film.

[0016] Furthermore, the POE film is heated and melted during the lamination process to fix the welding tape and the main grid.

[0017] Furthermore, the welding tape is a copper welding tape and the main grid is a copper grid line.

[0018] Due to the above technical solution, the main grid line on the cell piece is a copper grid line formed by copper electroplating. The welding tape is a copper welding tape. The welding tape and the main grid are fixed by fixing glue, so that the direct contact between the welding tape and the main grid is copper-copper contact, which can reduce the interface resistance during the current transmission process, improve the Rs of the module, enhance the power of the module. Instead of using the high-temperature welding method, the fixing glue is used to fix the welding tape and the main grid, and then through the lamination method, the POE film is heated and melted and shrunk to tightly attach the welding tape and the main grid, saving the welding cost and avoiding the damage to the cell piece caused by high temperature; increasing the contact area between the welding tape and the main grid, improving the contact resistance, and enhancing the module power. Description of the Drawings

[0019] Figure 1 is a schematic cross-sectional structure diagram of a solar cell module according to an embodiment of the present invention;

[0020] Figure 2 is a schematic structure diagram when the welding tape and the main grid are connected according to an embodiment of the present invention.

[0021] In the figure:

[0022] 1. Welding tape 2. Main grid 3. POE film

[0023] 4. Cell piece 5. Fixing glue Detailed Embodiments

[0024] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0025] Figure 1 and Figure 2The structural schematic diagram of an embodiment of the present invention is shown. This embodiment relates to a solar cell module with electroplated copper grid lines and a preparation method thereof. A copper solder tape is used for connecting between the battery cells, and the copper solder tape is in direct contact with the main grid of the battery cell. Moreover, a fixing adhesive is used to fix between the solder tape and the main grid, and during lamination, the POE film is heated and melted to tightly fix the solder tape and the main grid, reducing the interface resistance during current transmission, improving the Rs of the module, and enhancing the power of the module.

[0026] A preparation method of a solar cell module with electroplated copper grid lines, which is applied to the preparation of a solar cell module with electroplated copper grid lines, includes the following steps:

[0027] Fix the solder tape 1, and fix the solder tape 1 on the main grid 2 of the battery cell 4: When connecting the battery cells 4, the solder tape 1 is connected to the main grid 2 of the battery cell 4. The solder tape 1 is placed on the main grid 2 of the battery cell 4, and the solder tape 1 and the main grid 2 are fixed, connecting the solder tape 1 and the main grid 2 of the battery cell together; when fixing the solder tape 1 and the main grid 2, the solder tape 1 and the main grid 2 are fixed by a fixing adhesive 5. Through the fixing adhesive 5, the solder tape 1 and the main grid 2 are fixed together. In this embodiment, the fixing adhesive 5 can be a tape, glue or UV glue, all of which are commercially available products and are selected according to actual needs. No specific requirements are made here. Using the fixing adhesive 5 to fix the solder tape 1 and the main grid 2 does not require the use of a high-temperature welding process, saving the welding cost and at the same time avoiding the damage to the battery cell caused by high temperature.

[0028] When using the fixing adhesive 5 to fix the solder tape 1 and the main grid 2, the fixing adhesive 5 can be set at both ends of the main grid 2 to achieve the fixation of the solder tape 1 and the main grid 2. Or, the fixing adhesive 5 can be set at multiple positions on the main grid 2 to achieve the fixation of the solder tape 1 and the main grid 2. The setting method and position of the fixing adhesive 5 are selected according to actual needs. No specific requirements are made here.

[0029] According to the connection method of the above steps, connect the main grids of multiple battery cells 4 to the solder tape 1 respectively to connect multiple battery cells 4 to form a battery string. After the connection of the battery string is completed, cover the POE film 3 and the cover plate on the battery string in sequence to assemble the solar cell module; here, the above cover plate is glass or a backplane, which is selected and set according to actual needs;

[0030] After the POE film 3 and the cover plate are installed, lamination is carried out. When laminating, the lamination temperature is 120 - 180 °C. This lamination temperature can be 120 °C, 140 °C, 160 °C or 180 °C, or any temperature value between 120 - 180 °C, which is selected according to actual needs and no specific requirements are made here; during the lamination process, due to the high lamination temperature, the POE film 3 is heated and melted and shrinks, wrapping around the outside of the solder ribbon 1, the main grid 2 and the cell 4, tightly fitting the solder ribbon 1 and the main grid 2 together, fixing the solder ribbon 1 and the main grid 2, and ensuring the contact between the solder ribbon 1 and the main grid 2.

[0031] In this embodiment, the above-mentioned solder ribbon 1 is a copper solder ribbon, and the main grid 2 is a copper grid line formed by copper electroplating, so that the contact between the solder ribbon 1 and the main grid 2 is a copper - copper direct contact, which can reduce the interface resistance during current transmission, improve the Rs of the component, increase the power of the component, increase the contact area between the solder ribbon 1 and the main grid 2, improve the contact resistance, and increase the power of the component.

[0032] A solar cell module with electroplated copper grid lines, as Figure 1 and 2 shown, includes a plurality of cells 4. The plurality of cells 4 are connected by solder ribbons 1 to form a cell string. The solder ribbons 1 are in contact with the main grids 2 of the cells 4 and are fixed by bonding. The outside of the cells 4 is wrapped with a POE film 3.

[0033] A cover plate is covered outside the POE film 3. The cover plate is glass or a backplane for assembling the solar cell module.

[0034] When laminating, the lamination temperature is 120 - 180 °C. Due to the high lamination temperature, the POE film 3 is heated and melted and shrinks during the lamination process, wrapping around the outside of the solder ribbon 1, the main grid 2 and the cell 4, making the solder ribbon 1 and the main grid 2 tightly fit together and fixing the solder ribbon 1 and the main grid 2.

[0035] In this embodiment, the above-mentioned solder ribbon 1 is a copper solder ribbon, and the main grid 2 is a copper grid line formed by copper electroplating, so that the contact between the solder ribbon 1 and the main grid 2 is a copper - copper direct contact, which can reduce the interface resistance during current transmission, improve the Rs of the component, increase the power of the component, increase the contact area between the solder ribbon 1 and the main grid 2, improve the contact resistance, and increase the power of the component.

[0036] The solder ribbon 1 and the main grid 2 are adhesively fixed with a fixing adhesive 5. In this embodiment, the above-mentioned fixing adhesive 5 is a tape, which can be a high - temperature tape. The fixing adhesive 5 can also be glue, or the fixing adhesive 5 is a UV adhesive, all of which are commercially available products and are selected according to actual needs, and no specific requirements are made here.

[0037] Due to the above technical solution, the main grid lines on the battery cells are copper grid lines formed by copper electroplating, the solder tapes are copper solder tapes, and the solder tapes and the main grid are fixed by fixing glue, so that the direct contact between the solder tapes and the main grid is copper-copper contact, which can reduce the interface resistance during current transmission, improve the Rs of the component, and enhance the power of the component. Instead of using the high-temperature welding method, the solder tapes and the main grid are fixed by fixing glue, and then through the lamination method, the POE film is heated and melted and shrunk to tightly attach the solder tapes and the main grid, saving the welding cost and avoiding the damage to the battery cells caused by high temperature; the contact area between the solder tapes and the main grid is increased, the contact resistance is improved, and the power of the component is enhanced.

[0038] The above has described the embodiments of the present invention in detail, but the content described is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A preparation method of a solar cell module with electroplated copper grid lines, characterized in that: It includes the following steps: Fix the welding tape, and bond and fix the welding tape on the main grid of the battery cell; Connect multiple battery cells to form a battery string, and sequentially cover with a POE film and a cover plate; Perform lamination to bond the welding tape and the main grid together.

2. The preparation method of the solar cell module with electroplated copper grid lines according to claim 1, characterized in that: The welding tape is a copper welding tape.

3. The preparation method of the solar cell module with electroplated copper grid lines according to claim 2, characterized in that: The main grid is a copper grid line.

4. The preparation method of the solar cell module with electroplated copper grid lines according to any one of claims 1-3, characterized in that: When performing lamination, the lamination temperature is 120-180 °C.

5. The preparation method of the solar cell module with electroplated copper grid lines according to claim 4, characterized in that: When performing lamination, the POE film melts by heat, and fixes the welding tape and the main grid.

6. The preparation method of the solar cell module with electroplated copper grid lines according to any one of claims 1-3 and 5, characterized in that: The welding tape and the main grid are fixed by a fixing adhesive.

7. The preparation method of the solar cell module with electroplated copper grid lines according to claim 6, characterized in that: The fixing adhesive is a tape, glue or UV glue.

8. A solar cell module with electroplated copper grid lines, characterized in that: It includes multiple battery cells, and the multiple battery cells are connected by welding tapes. The welding tapes are in contact with the main grids of the battery cells and are fixed by welding. The outside of the battery cells is wrapped with a POE film.

9. The solar cell module with electroplated copper grid lines according to claim 8, characterized in that: The POE film melts by heat during the lamination process to fix the welding tape and the main grid.

10. The solar cell module with electroplated copper grid lines according to claim 8 or 9, characterized in that: The welding tape is a copper welding tape, and the main grid is a copper grid line.

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