Solar cell back membrane and preparation method thereof

A solar cell and back film technology, which is applied in the field of solar cells, can solve the problems of high preparation costs, achieve the effects of increasing surface tension, improving adhesion, and reducing production costs

Inactive Publication Date: 2018-03-20
马继
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the high-viscosity fluorocarbon resin used in the back film of solar cells is monopolized by Daikin Corporation of Japan. When preparing the back film of solar cells by roller coating method, it can only be imported from Daikin Corporation of Japan, and the preparation cost is relatively low high

Method used

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  • Solar cell back membrane and preparation method thereof

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preparation example Construction

[0018] The invention provides a preparation method of a solar cell back film, which comprises the following steps of performing corona, dip coating and heat treatment on a base film in sequence to obtain a solar cell back film.

[0019] In the present invention, the base film preferably includes a PET base film. The present invention has no special requirements on the source of the PET base film, and a commercially available PET base film known to those skilled in the art and used as the back film of a solar cell can be used.

[0020] In the present invention, the voltage of the corona treatment is preferably 6 to 9KV, more preferably 6.5 to 8.5KV, more preferably 7 to 8KV; the time of the corona treatment is preferably 0.5 to 2s, more preferably 1 ~2s, more preferably 1~1.5s. In the present invention, the corona treatment can effectively improve the surface tension of the base film. During the dip coating process, the dip coating liquid can be fully spread on the surface of ...

Embodiment 1

[0041] In parts by mass, 100 parts of phenolic resin 2402, 55 parts of rutile type titanium dioxide, 10 parts of hexamethylenetetramine and 70 parts of xylene were mixed to obtain a dip coating liquid. The PET base film was dip-coated in the dip coating solution at room temperature for 30 s, and the dip-coating speed was 0.75 m / min; the base film after dip-coating was heated at 120° C. for 12 min to obtain a solar cell back film.

Embodiment 2

[0043] In parts by mass, 100 parts of epoxy resin E-51, 55 parts of rutile type titanium dioxide, 15 parts of triethanolamine and 60 parts of xylene were mixed to obtain the first dip coating solution; at 20 ° C, the PET base film was mixed. Dip coating in the first dip coating solution for 30 s, and the dip coating speed is 0.75 m / min; the base film obtained by the first dip coating is heated at 100° C. for 10 min, and cooled to room temperature under air.

[0044] In parts by mass, 100 parts of phenolic resin 2402, 50 parts of rutile type titanium dioxide, 20 parts of hexamethylenetetramine and 65 parts of xylene were mixed to obtain a dip coating liquid. The PET base film was dip-coated in the dip-coating solution at room temperature for 50 s, and the dip-coating speed was 0.85 m / min; the base film after dip-coating was heated at 110° C. for 10 min to obtain a solar cell back film.

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Abstract

The invention provides a preparation method of a solar cell back membrane. The method comprises the steps of sequentially carrying out electric corona, dip coating and heating treatments on a base membrane. By adopting the preparation method of the solar cell back membrane, the solar cell back membrane can be prepared without modifying the resin. Therefore, the problem in the prior art that the fluorine-containing resin needs to be subjected to blow molding modification or the high-viscosity fluorocarbon resin needs to be prepared is solved. Meanwhile, the production cost is reduced. The invention provides a solar cell back membrane prepared by the above method. The peeling strength average value of the solar cell back membrane and EVA (ethylene-vinyl acetate) reaches 104.5N / cm, and the adhesive force of the coating reaches the zero level. The breakdown voltage reaches 19 kV. Meanwhile, the results of the solar cell back membrane in the neutral salt fog experiment and the boiling waterexperiment are qualified. Moreover, the results of the solar cell back membrane in the wet-heat experiment, the ultraviolet experiment, the thermal cycling experiment and the wet-freezing experimentcan all reach the level A.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a solar cell back film and a preparation method thereof. Background technique [0002] The back film of solar cell is usually prepared by composite method or roll coating method. The composite method is to bond the pre-formed polymer film and the base film through an adhesive. When the composite method is used to prepare the solar cell back film, the polymer film needs to be prepared in advance by blow molding, and in the process of preparing the polymer film material by blow molding, the polymer film needs to be further improved with fluorine-containing functional groups, so that the fluorine The compounds are directionally arranged on the air surface, but there is currently no blow molding modification technology in China. The polymer films used in the preparation of the back film of solar cells by the composite method are usually imported from abroad, such as DuPont in the United S...

Claims

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Application Information

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IPC IPC(8): H01L31/18H01L31/049
CPCH01L31/18H01L31/049Y02E10/50
Inventor 马继
Owner 马继
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