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
View PDF0 Cites 25 Cited by
  • 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 va

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Back film for solar module

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] In the production process of the back film, firstly, PET, EVOH and PA610 were co-extruded and stretched in three layers in a mass ratio of 100:30:10 to obtain an intermediate layer with a thickness of 300 microns, and the ethylene content in the selected EVOH was 38%; The PET surface is compounded with a 30-micron-thick PVDF film, and the PA610 surface is coated with a 350-micron-thick EVA film. The ingredients of the EVA film are ethylene-vinyl acetate copolymer with a mass content of VA (vinyl acetate) of 33% (DuPont, USA) 59%, shading filler titanium dioxide R906 (DuPont, USA) 40%, adding 0.1% UV absorber 2,2'-tetramethylenebis(3,1-benzoxazin-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 - 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-tr...

Example Embodiment

[0032] Example 2

[0033] In the manufacturing process of the back film, firstly, PEN, EVOH and EVA are co-extruded and stretched in three layers in a mass ratio of 100:30:10 to obtain an intermediate layer with a thickness of 250 microns. The ethylene content in the selected EVOH is 38%. EVA does not contain additives and is only used as an adhesive layer; then, a 30-micron-thick PVF film is compounded on the PET surface, and a 400-micron-thick EVA film is spray-coated on the surface of the adhesive layer. The mass content of VA (vinyl acetate) in the EVA ingredients is 33% of ethylene-vinyl acetate copolymer (DuPont, USA) 75%, shading filler is carbon black N550 (Germany Degussa company) 20%, adding 0.5% UV absorber 2-(2'-hydroxyl- 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 ...

Example Embodiment

[0034] Example 3

[0035] In the production process of the back film, firstly, PET, EVOH and PA612 were co-extruded and stretched in three layers in a mass ratio of 100:70:10 to obtain an intermediate layer with a thickness of 50 microns, and the ethylene content in the selected EVOH was 44%; A 30-micron-thick ETFE film is compounded on the PET surface, and a 100-micron-thick EVA film is spray-coated on the surface of 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap