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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: 2010-06-30
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 back film manufacturing process, first PET, EVOH and PA610 are stretched by three layers of co-extrusion in a mass ratio of 100:30:10 to obtain a 300-micron-thick middle layer, and the ethylene content in the selected EVOH is 38%; then, in Composite 30-micron thick PVDF film on the PET surface, and coat a 350-micron thick EVA film on the PA610 surface. The ingredients of the EVA film are 33% ethylene-vinyl acetate copolymer (U.S. DuPont) with a VA (vinyl acetate) mass content. 59%, opacifying filler titanium dioxide R906 (U.S. DuPont Company) 40%, add 0.1% ultraviolet absorber 2,2'-tetramethylene bis(3,1-benzoxazin-4-ketone) (Nanjing Zhong He Sheng Technology Co., Ltd.), 0.1% light stabilizer N, N'-bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,6-hexamethylenediamine and morpholine -polymer of 2,4,6-trichloro-1,3,5-triazine (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...

Embodiment 2

[0033] In the back film manufacturing process, first PEN, EVOH and EVA are stretched by three layers of co-extrusion in a mass ratio of 100:30:10 to obtain a 250-micron-thick middle layer. The ethylene content in the selected EVOH is 38%, and the selected EVA does not contain additive, only as bonding layer; Then, compound the thick PVF film of 30 microns on PET surface, flow coat the EVA film of 400 microns thick on bonding layer surface, VA (vinyl acetate) mass content in this EVA batching is 33% ethylene-vinyl acetate copolymer (U.S. DuPont) 75%, the shading filler is 20% of carbon black N550 (Germany Degussa), and 0.5% of UV absorber 2-(2'-hydroxyl- 5-methylphenyl)benzotriazole (Nanjing Zhonghesheng Technology Co., Ltd.), 0.5% antioxidant 1,3,5-tri(4-tert-butyl-3-hydroxyl-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; American Cytec Corporation), 2.5% light stabilizer succinic acid an...

Embodiment 3

[0035] In the back film manufacturing process, first PET, EVOH and PA612 are stretched by three layers of co-extrusion in a mass ratio of 100:70:10 to obtain a 50-micron-thick middle layer, and the ethylene content in the selected EVOH is 44%; then, in The PET surface is compounded with a 30-micron thick ETFE film, and a 100-micron thick EVA film is flow-coated on the PA612 surface. The EVA ingredients are the same as in Example 1, so that it has light-shielding properties, encapsulation and weather resistance. The resulting 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 battery module. (2) Background technology [0002] As a device that directly converts solar energy into electric energy, solar cell modules have attracted much attention in terms of efficiency of use of natural resources and ecological protection, and various solar cell modules have been developed. [0003] In a solar cell module, the solar cell (photovoltaic element made of silicon material) is encapsulated in 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 (backsheet material). [0004] The backsheet material used here should be lightweight, and since solar cell modules are usually installed outdoors, the backsheet used as packaging material is required to have good weather resistance. Secondly...

Claims

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Application Information

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IPC IPC(8): H01L31/0203H01L31/048B32B27/08B32B27/18
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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