Transparent back film for solar cell

A solar cell and transparent technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of complex production process of fluoropolymers, environmental pollution in the production process, easy to fall off, etc., to avoid falling off and delamination, overcome the The light transmittance will be significantly reduced and the bond strength will be improved

Active Publication Date: 2013-02-13
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the usual back film is formed by compounding or coating a weather-resistant fluoropolymer material on a polyester (PET) substrate. Due to the existence of fluoropolymer itself (1) the production process is complicated and the production process is polluted environment; (2) high production cost; (3) strong chemical inertness, poor wettability and other shortcomings, resulting in existing back film products: a. high product cost; b. easy to fall off during use Defects such as delamination
[0005] In addition, in the existing back film products, its adhesive layer is mainly made of polyolefin films. These polyolefin films have the defect of poor weather resistance. There will be a significant decrease in light transmittance and increased haze, which cannot meet the needs of BIPV or double-sided photovoltaic power generation modules

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, the back film of the present invention includes an electrical insulation layer 3 , an adhesive layer 2 and a weather-resistant layer 1 located outside the electrical insulation layer, and an adhesive layer 4 located inside the electrical insulation layer 3 . The electrical insulating layer 3 of the present invention is a transparent PET with a thickness of 0.250mm, and the outer side of the electrical insulating layer is coated with an adhesive layer 2, and the adhesive layer 2 is a transparent two-component polyurethane adhesive with a thickness of 0.008mm The weather-resistant layer 1 is a transparent weather-resistant PET with a thickness of 0.050mm, and an adhesive layer 4 is coated on the inside of the electrical insulating layer 3, and the adhesive layer 4 is a transparent one-component acrylic resin with a thickness of 0.006mm.

[0032] The production method is to apply the adhesive layer 4 on one side of the electrical insulating layer...

Embodiment 2

[0034] Such as figure 1 As shown, the electrical insulating layer 3 of the back film of the present invention is a transparent PEN with a thickness of 0.350mm, and the outer side of the electrical insulating layer is coated with an adhesive layer 2, and the adhesive layer 2 is a transparent double-pack with a thickness of 0.020mm. Polyurethane adhesive, the weather-resistant layer 1 is a transparent weather-resistant PET with a thickness of 0.025mm, and an adhesive layer 4 is coated on the inside of the electrical insulation layer 3, and the adhesive layer 4 is a transparent two-component layer with a thickness of 0.002mm Acrylic.

[0035] of the present invention The production method is as follows: on one side of the electrical insulating layer 3, the adhesive layer 4 is coated by the gravure coating method, and the coating speed is 40m / min. One side is coated with the adhesive layer 2 by the gravure coating method, the coating speed is 15 m / min, after drying at 80°C, the...

Embodiment 3

[0037] Such as figure 1 As shown, the electrical insulating layer 3 of the present invention is a transparent PETG with a thickness of 0.125 mm, and the outer side of the electrical insulating layer is coated with an adhesive layer 2, and the adhesive layer 2 is a transparent one-component polyurethane with a thickness of 0.004 mm. Adhesive, the weather-resistant layer 1 is a transparent weather-resistant PET with a thickness of 0.175mm, and an adhesive layer 4 is coated on the inside of the electrical insulating layer 3, and the adhesive layer 4 is a transparent one-component acrylic resin with a thickness of 0.015mm .

[0038] of the present invention The production method is as follows: on one side of the electrical insulating layer 3, the adhesive layer 4 is coated by the gravure coating method, the coating speed is 70m / min, and it is wound after drying at 110°C. One side is coated with the adhesive layer 2 by the gravure coating method, the coating speed is 60 m / min, a...

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Abstract

The invention discloses a transparent back film for a solar cell. The transparent back film comprises a weather-resistant layer, a bonding layer, an electrical insulating layer and an adhesive layer, which are compounded into a whole, wherein the bonding layer is coated on one surface of the electrical insulating layer; and the adhesive layer is coated on the other surface of the electrical insulating layer; and the weather-resistant layer is compounded on the outer surface of the bonding layer. The transparent back film has a simple structure, is low in cost, high in interlayer adhesive strength and good in electrical insulating property, can ensure the 25-year service life of the solar cell assembly, and can be extensively applied to building integrated photovoltaics (BIPV), a double-faced photovoltaic power generation assembly and the like.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a transparent solar battery back film. Background technique [0002] As a green alternative to traditional methods of electricity production, photovoltaic cell modules are used to generate electricity from the sun. Photovoltaic cell module is a laminated structure, assembled by various semiconductor components, it mainly includes glass surface layer, EVA sealing layer, solar cells, EVA sealing layer and solar cell back film. Since photovoltaic cell modules are usually installed outdoors, they must be protected to reduce the impact and damage of environmental effects such as moisture, oxygen and ultraviolet rays. Therefore, they have excellent electrical insulation, interlayer bonding strength, weather resistance, and UV resistance. The back film with moisture barrier performance plays an important protective role in photovoltaic cell modules. [0003] With the development of building-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/048B32B27/36B32B27/08B32B7/12
CPCY02B10/10Y02E10/50Y02A30/60
Inventor 田勇张艳李华锋柳青宋建龙李茜茜李亚钊
Owner 乐凯胶片股份有限公司
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