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Copper ink for solar cell, preparation method of the copper ink, manufacturing method of solar cell main grid, and solar cell module

A technology for a solar cell and a manufacturing method, which is applied in the field of solar cells, can solve the problems of difficulty in welding welding ribbons, being unsuitable for the production requirements of solar cells, and reducing the adhesion and tension of the welding ribbons, thereby achieving the effect of reducing production costs and difficulty.

Inactive Publication Date: 2013-11-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method saves the amount of silver paste, it also affects the performance of the battery to a certain extent. More importantly, in the subsequent assembly process of the battery, it brings great difficulties to the welding of the ribbon, and at the same time causes the adhesion of the ribbon. Greatly reduced, affecting the manufacturing yield and performance of component modules
[0006] Patent CN200710044169 provides a conductive copper paste for ceramic capacitors. Due to its poor welding performance and general conductivity, the copper paste is not suitable for the production requirements of solar cells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The present invention also provides a method for preparing copper ink for solar cells, comprising steps: 1) mixing copper powder, flux, and glass frit to obtain the first component; 2) mixing the binder and the first component to obtain Copper ink for solar cells. The copper ink for solar cells of the present invention can be prepared by this method.

[0029] The present invention also provides a method for manufacturing the main grid of a solar cell, printing or spraying copper ink on the surface of the solar cell main grid, and drying and sintering to obtain the main grid of the solar cell, wherein the copper ink is prepared by the present invention Described solar cell uses copper ink.

[0030] According to the solar cell of the present invention, preferably, the drying temperature is 70-120°C, and the sintering temperature is 350-800°C.

[0031] The manufacturing method of the solar cell busbar described in the present invention can be applied to crystalline silic...

Embodiment 1

[0035] 1. The production of copper ink

[0036] Step (1): 1kg of copper powder with a purity of 99.9% and a particle size of 2um, glass frit with a particle size of 10um (SiO 2 25g and CaO25g), 100g of flux Sn with a particle size of 10um was added to the ball mill and stirred at high speed for 6 hours, and the mixture was taken out for use; step (2): 50g of surfactant dodecylphenol polyoxyethylene ether, solvent pine Add 0.5kg of oleyl alcohol and 50g of ethyl cellulose as binder into the material barrel and stir slowly for 2 hours until the binder and surfactant are completely dispersed. Step (3): Slowly add the mixture in step 1 to the solution in step 2, and stir slowly to obtain the copper ink S1 of the present invention.

[0037] 2. Fabrication of solar cells

[0038]Place the silicon wafer (commercially available polysilicon with a size of 156×156 mm) to be printed on the main grid after cleaning, diffusion, coating and other processes in the screen printing equipment...

Embodiment 2

[0040] Copper ink S2 and solar cell S20 of the present embodiment are prepared in the same steps as in Example 1, the difference is:

[0041] In step (1), 1kg of silver-plated copper powder with a purity of 99.9% and a particle size of 18um, glass frit with a particle size of 1um (silicon oxide 10g and bismuth oxide 10g), and a particle size of 30um flux (bismuth 50g , tin 150g) was added to the ball mill and stirred at high speed for 6 hours, and the mixture was taken out for use; in step (2), the surfactant dimethyl alkyl betaine 5g, the solvent dimethyl sulfone 0.2kg, the binder poly Divinylidene fluoride 10g was added into the tank and stirred slowly until the binder and surfactant were completely dissolved; other steps were the same as in Example 1 to obtain the copper ink S2 and solar cell S20 of the present invention.

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Abstract

The invention provides copper ink for a solar cell. The copper ink comprises copper powder, a soldering flux, frit and a binder. The invention also provides a preparation method of the copper ink for a solar cell. The preparation method comprises the following steps of 1, mixing the copper powder, the soldering flux and the frit to obtain a first ingredient, and 2, mixing the binder and the first ingredient to obtain the copper ink for the solar cell. The invention provides a manufacturing method of a solar cell main grid. The manufacturing method comprises the following steps of printing or coating the copper ink on a surface main-grid zone of a solar cell, and carrying out drying and sintering to obtain the solar cell main grid. The invention also provides a solar cell module. The solar cell piece obtained by the invention has good performances, a low production cost and low production difficulty.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a copper ink for a solar cell and a preparation method thereof, a method for manufacturing a main grid of a solar cell, and a solar cell component. Background technique [0002] Solar cells directly convert light energy into electrical energy. Compared with other energy sources, it reduces a lot of intermediate links that cause energy loss. Therefore, for the entire earth's energy system, it has the highest utilization rate compared to other forms of solar energy utilization methods. . At the same time, solar cells emit zero emissions during use and have no pollution to the environment. They are the most representative energy source in a modern low-carbon society. [0003] In the manufacturing process of solar cells, it is necessary to make electrodes on the front and back sides separately to derive the voltage and current converted by the cells. In order to collect more current and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/02C09D11/14C09D11/10H01L31/18H01L31/0224
CPCY02P70/50
Inventor 姜俊刚王胜亚孙玉星张丹
Owner BYD CO LTD