Solar-cell backsheet and solar-cell module

A technology for solar cells and back sheets, applied in circuits, applications, photovoltaic power generation, etc., can solve the problems of reduced adhesive adhesion, increased manufacturing costs, insufficient adhesion, etc., and achieves excellent adhesion durability, Low manufacturing cost, excellent weather resistance and water vapor barrier properties

Active Publication Date: 2013-02-06
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dry lamination method has the following problems, and there is room for improvement. The problem is that the adhesive used is deteriorated by hydrolysis and the adhesive force is reduced, or it takes time until the curing reaction of the adhesive is completed after lamination. Long time, so manufacturing cost increases
[0010] In addition, a back sheet using a maleic anhydride-modified polyolefin-based resin as an adhesive layer has been proposed (Patent Document 3). Excellent, but there is a problem of insufficient adhesion to EVA or vapor-deposited PET

Method used

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  • Solar-cell backsheet and solar-cell module
  • Solar-cell backsheet and solar-cell module
  • Solar-cell backsheet and solar-cell module

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach ）

[0177] The first embodiment of the present invention consists of a weather-resistant polyester resin film (first layer) / modified polyolefin resin layer (second layer) / evaporated polyester resin film (third layer) / modified Backsheet for solar cells with a five-layer structure consisting of polyolefin resin layer (fourth layer) / weather-resistant polyester resin film (fifth layer). Solar cells are arranged on the fifth layer side. In this form, high water vapor barrier properties can be ensured by the presence of the third layer.

[0178] It is preferable to further apply a fluorine-based paint to the outer surface (surface opposite to the second layer) of the weather-resistant polyester resin film of the first layer to improve weather resistance.

[0179] In order to improve the adhesiveness with the sealing material of the solar cell element, it is preferable to further provide an undercoat layer on the outer surface (the surface opposite to the fourth layer) of the weather-re...

no. 2 approach ）

[0185] The second embodiment of the present invention is a three-dimensional structure consisting of a weather-resistant polyester resin film (first layer) / modified polyolefin resin layer (second layer) / weather-resistant polyester resin film (third layer). Layer structure backsheet for solar cells. Solar cells are arranged on the third layer side.

[0186] It is preferable to further apply a fluorine-based paint to the outer surface (surface opposite to the second layer) of the weather-resistant polyester resin film of the first layer to improve weather resistance.

[0187] In order to improve the adhesiveness with the sealing material of the solar cell element, it is preferable to further provide a primer layer on the outer surface (the surface opposite to the second layer) of the weather-resistant polyester resin film of the third layer.

[0188] It is preferable to mix a white pigment in the third layer so that sunlight can be reflected.

[0189] In this embodiment, it is...

no. 3 approach ）

[0192] The third embodiment of the present invention is a resin layer (third layer) composed of weather-resistant polyester resin film (first layer) / modified polyolefin resin layer (second layer) / unmodified polyolefin resin component. layer) / modified polyolefin-based resin layer (fourth layer) is a four-layer back sheet for solar cells. In this embodiment, the second layer, the third layer, and the fourth layer are formed of an olefin-based resin, so the water vapor barrier properties required as a solar battery back sheet can be ensured.

[0193] The solar cell element is placed in direct contact with the surface of the fourth layer. In this case, there is no need to arrange a sealing material for sealing the solar cell element between the solar cell element and the fourth layer. The fourth layer functions as a sealing material for the solar cell element. That is, the back sheet for solar cells of this aspect has a function not only as a back sheet but also as a sealing mat...

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Abstract

Disclosed is a solar-cell backsheet, the constituent members of which adhere to each other well. Furthermore, said solar-cell backsheet is inexpensive to manufacture, highly weather-resistant, and has excellent water-vapor barrier performance. The disclosed solar-cell backsheet has a layered structure comprising at least three layers. The first layer is a weather-resistant polyester resin film or fluorine resin film. The second layer is a polyolefin layer that is between 5 and 250 [mu]m thick and comprises a modified polyolefin resin obtained by grafting 1 to 30 weight parts of an epoxy-group-containing vinyl monomer and 0.1 to 30 weight parts of an aromatic vinyl monomer onto 100 weight parts of a polyethylene, a polypropylene, or an ethylene-propylene copolymer. The third layer is a polyester layer, a polyolefin layer, or aluminum foil. The combined thickness of the second and third layers is at least 30 [mu]m.

Description

technical field [0001] The present invention relates to a solar cell back sheet and a solar cell module including the same. Background technique [0002] In recent years, attention has been paid to solar cells that directly convert sunlight into electrical energy from the viewpoint of efficient use of resources, prevention of environmental pollution, and the like, and further research has been conducted. [0003] There are various types of solar cells, and representative solar cells include amorphous silicon-based solar cells, crystalline silicon-based solar cells, dye-sensitized solar cells, and the like. [0004] A silicon-based solar cell is generally composed of a surface protection material, a silicon power generation element, a back sealing material, a back sheet (back protection sheet), and the like. [0005] Amorphous silicon-based solar cells have the advantage of using less silicon, but are easily affected by humidity, and thus have a problem of lowering output du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/042B32B27/32B32B27/36
CPCB32B7/02B32B15/085H01L31/0487B32B2457/12B32B27/322B32B27/08B32B2307/7246Y02E10/50B32B27/36H01L31/048B32B2307/712B32B27/32B32B7/04H01L31/049Y10T428/24967
Inventor 田中克幸和田一仁
Owner KANEKA CORP
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