Back film for solar module

A solar cell and back film technology, applied in electrical components, circuits, photovoltaic power generation, etc., can solve the problems of solar cell module leakage, low production efficiency, short circuit of metal foil, etc., and achieve good water vapor barrier performance, good cost, and cost control Effect

Active Publication Date: 2011-07-20
HANGZHOU FIRST APPLIED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several defects in the traditional backsheet material using metal foil: Firstly, the solar cell module using the traditional backsheet has leakage phenomenon
Second, the underlying cells and ribbons may penetrate the resin film and cause a short circuit on the metal foil
In recent years, there is a new method to increase the water vapor barrier performance of the back sheet. This method is to chemically vapor-deposit inorganic silicon oxide on the PET middle layer of the back sheet. This back sheet has excellent water vapor barrier performance and can be compared with Backsheets containing metal foils are comparable, but this method is more expensive and less productive

Method used

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  • Back film for solar module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In the manufacturing process of the back film, firstly, PET, EVOH and PA610 were co-extruded and stretched to obtain a 300 micron thick intermediate layer at a mass ratio of 100:30:10. The ethylene content of the selected EVOH was 38%; The PET surface is compounded with a 30-micron-thick PVDF film, and a 350-micron-thick EVA film is spray-coated on the surface of the PA610. The EVA film is made of ethylene-vinyl acetate copolymer with a mass content of VA (vinyl acetate) of 33% (DuPont, USA) 59%, light-shielding filler titanium dioxide R906 (U.S. DuPont) 40%, adding 0.1% ultraviolet absorber 2,2'-tetramethylene bis(3,1-benzoxazine-4-one) (Nanjing Zhong He Sheng Technology Co., Ltd.), 0.1% light stabilizer N,N'-bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,6-hexanediamine and morpholine -2,4,6-trichloro-1,3,5-triazine polymer (Beijing Tiangang Co., Ltd.), 0.2% antioxidant 1,3,5-tris(4-tert-butyl-3 -Hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione / bis(2,4-d...

Embodiment 2

[0033] In the manufacturing process of the back film, firstly, PEN, EVOH and EVA are co-extruded and stretched in a mass ratio of 100:30:10 to prepare a 250-micron thick intermediate layer. The ethylene content of the selected EVOH is 38%. EVA contains no additives and only serves as a bonding layer; then, a 30-micron-thick PVF film is compounded on the surface of the PET, and a 400-micron-thick EVA film is sprayed on the surface of the bonding layer. The VA (vinyl acetate) mass content in the EVA ingredients is 33% ethylene-vinyl acetate copolymer (U.S. DuPont) 75%, light-shielding filler is carbon black N550 (German Degussa) 20%, and 0.5% UV absorber 2-(2'-hydroxy- 5-methylphenyl)benzotriazole (Nanjing Zhonghesheng Technology Co., Ltd.), 0.5% antioxidant 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-di Methylbenzyl)-1,3,5-triazine-2,4,6-(1H,3H,5H)-trione / bis(2,4-dicumylphenyl)pentaerythritol diphosphite Compound (mass ratio 1:1; Cytec Corporation), 2.5% light stabilizer succinic aci...

Embodiment 3

[0035] In the manufacturing process of the back film, firstly, PET, EVOH and PA612 were co-extruded and stretched in a mass ratio of 100:70:10 to prepare a 50-micron thick intermediate layer. The ethylene content in the selected EVOH was 44%; The PET surface is compounded with a 30-micron thick ETFE film, and a 100-micron thick EVA film is spray-coated on the surface of the PA612. The EVA ingredients are the same as in Example 1, so that it has light-shielding, encapsulation and weather resistance. The prepared sample is labeled S3.

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Abstract

The invention discloses a back film for a solar module; the back film comprises an outer surface fluoride containing layer, a middle layer and an inner surface ethylene- vinyl acetate copolymer layer; the middle layer comprises a polyester layer, an ethylene-vinyl alcohol copolymer layer and a bonding layer; the middle layer is prepared by co-extruding the polyester material layer, the ethylene-vinyl alcohol copolymer layer and the bonding layer; the outer surface fluoride containing layer is a fluoride containing film compounded on the polyester layer of the middle layer or the fluoride containing coating coated on the polyester layer of the middle layer; and the inner surface ethylene- vinyl acetate copolymer layer is applied on the bonding layer of the middle layer by curtain coating. The back film of the solar module provided by the invention has the advantages of low water vapor transmission rate and high insulation performance, not only has excellent barrier and insulation performance, but also has the packaging performance.

Description

(1) Technical field [0001] The invention relates to a novel back film which can be used as a protective layer on the back of a solar cell module. (2) Background technology [0002] As a device that directly converts solar energy into electrical energy, solar cell modules have attracted much attention in the use of natural resources and ecological protection, and a variety of solar cell modules have been developed. [0003] In a solar cell module, the solar cell (photovoltaic element made of silicon material) is encapsulated on a transparent front protective layer (light-transmitting surface, made of glass or similar) with an ethylene-vinyl acetate copolymer (EVA) film. Between the material) and the back protective layer (back plate material). [0004] The backsheet material used here should be light and handy, and since solar cell modules are usually installed outdoors, the backsheet used as the packaging material is required to have good weather resistance. Secondly, the backplane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0203B32B27/08H01L31/048B32B27/18
CPCY02E10/50
Inventor 杨楚峰周光大侯宏兵罗坤林建华
Owner HANGZHOU FIRST APPLIED MATERIAL CO LTD
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