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Special back seal film for solar cell

A solar cell and back-sealing technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of difficult heat dissipation, cumbersome processing of solar cell back-sealing films, etc., to prevent hydrolysis, good air insulation performance, and good electrical insulation performance. Effect

Inactive Publication Date: 2010-09-29
HUNAN HUANQIU SOLAR TECH DEV
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AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a solar cell back-sealing film with strong bonding ability, low cost, good dimensional stability, and good air isolation for the problems of cumbersome processing and difficult heat dissipation in the existing solar cell back sealing film. High Performance Solar Cell Backsheet Materials

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Embodiment Construction

[0007] Because the PET in the middle of the existing TPT composite film mainly plays the role of insulation, and the fluorine material mainly plays the role of isolating air, water vapor and preventing oxidation. Just based on the functions played by the above two materials in the composite membrane, only PET and fluorine materials are reserved in the present invention. Due to the reduction of one layer of fluorine material and the use of two layers of adhesive EVA, the cost of the composite film is greatly reduced, and the dimensional stability of the composite film is improved due to the reduction of the number of layers.

[0008] The difference between the present invention and the prior art is mainly reflected in:

[0009] 1. Replace the polyethylene terephthalate (PET) in the TPT back-sealing film structure with ethylene-vinyl acetate (EVA);

[0010] 2. Put EVA or epoxy resin (including modified epoxy resin) on polyvinyl fluoride (PVF) or polyvinylidene fluoride (PVDF) o...

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Abstract

The invention relates to a backboard material of a back protective layer of a solar cell assembly. The special back seal film for a solar cell is a composite film formed by carrying out vacuum hot pressing and laminating on the following three layered film materials: the outer layer is made of one of the following materials: polyvinyl fluoride, polyvinylidene fluoride, fluoroplastics, ethylene-trifluorochloroethylene copolymer or ethylene-propylene-diene monomer; the middle layer is one of the following materials: ethylene-vinyl acetate or epoxy resin; and the inner layer is polyethylene terephthalate. The backboard material of the invention has the advantages of strong binding force, low cost, good dimensional stability and the like, has good air isolating performance, good oxidation protection and moisture resistance, good electrical insulation performance and performance of preventing an adhesive substance from hydrolyzing for a long time, and is the excellent back seal film for the solar cell.

Description

technical field [0001] The invention relates to a back sheet material for a protective layer on the back of a solar battery module. Background technique [0002] The back-sealing film used in solar cell packaging must have good air barrier performance, good oxidation resistance and moisture resistance, good electrical insulation performance, and long-term protection against hydrolysis of the adhesive. Currently, domestic solar cell manufacturers use All of them are expensive imported TPT (polyvinyl fluoride composite film) back-sealing film for solar energy, which has a 5-layer structure, which is the outer layer of polyvinyl fluoride film (PVF) film, the adhesive layer, and the middle layer of polyester ( PET) film, adhesive layer, inner polyvinyl fluoride film (PVF) film. [0003] The current technology and design mainly have the following problems: 1. Since the bonding between the polyester (PET) film of the middle layer and the polyvinyl fluoride film (PVF) film of the ...

Claims

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Application Information

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IPC IPC(8): H01L31/048B32B27/08B32B33/00H01L31/049
CPCY02E10/50
Inventor 张子军刘毛平肖沙
Owner HUNAN HUANQIU SOLAR TECH DEV
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