Solar cell rear surface protective sheet and solar cell module

Patent metadata

Field	Value
Publication number	US-2017133531-A1
Application number	US-201715415872-A
Country	US
Kind code	A1
Filing date	Jan 26, 2017
Priority date	Aug 29, 2014
Publication date	May 11, 2017
Grant date	—

Abstract

Provided are a solar cell rear surface protective sheet comprising: a base material film including a white polyester film and having a thickness of from 20 μm to 500 μm, a first resin layer having a modulus of tensile elasticity of 1.2 GPa or higher and 3.0 GPa or lower and a thickness of 1 μm or greater, and a second resin layer having a lower modulus of tensile elasticity than the first resin layer, which are laminated in this order.

First claim

What is claimed is:

1 . A solar cell rear surface protective sheet comprising:
a base material film including a white polyester film and having a thickness of from 20 μm to 500 μm, a first resin layer having a modulus of tensile elasticity of 1.2 GPa or higher and 3.0 GPa or lower and a thickness of 1 μm or greater, and a second resin layer having a lower modulus of tensile elasticity than the first resin layer, which are laminated in this order.

2 . The solar cell rear surface protective sheet according to claim 1 ,
wherein the thickness of the first resin layer is 8 μm or smaller.

3 . The solar cell rear surface protective sheet according to claim 1 ,
wherein the modulus of tensile elasticity of the second resin layer is 150 MPa or lower.

4 . The solar cell rear surface protective sheet according to claim 3 ,
wherein the second resin layer includes an olefin-based resin.

5 . The solar cell rear surface protective sheet according to claim 4 ,
wherein a thickness of the second resin layer is 0.01 μm or greater and 1 μm or smaller.

6 . The solar cell rear surface protective sheet according to claim 1 ,
wherein the first resin layer includes at least one of an acrylic resin or an ester-based resin.

7 . The solar cell rear surface protective sheet according to claim 1 ,
wherein the white polyester film is a film produced through a heat setting process, and a heat setting temperature in the heat setting process is 180° C. or higher and 220° C. or lower.

8 . The solar cell rear surface protective sheet according to claim 1 ,
wherein the white polyester film includes inorganic particles as a whitening agent.

9 . The solar cell rear surface protective sheet according to claim 8 ,
wherein a content of the inorganic particles included in the white polyester film is 0.1 mass % or more and 10 mass % or less.

10 . The solar cell rear surface protective sheet according to claim 9 ,
wherein the inorganic particles included in the white polyester film are titanium oxide.

11 . A solar cell module comprising:
an element structure portion which includes a solar cell element and a sealing material which seals the solar cell element; a transparent substrate which is positioned on a side of the element structure portion on which sunlight is incident; and the solar cell rear surface protective sheet according to claim 1 , which is positioned on a side opposite to the side of the element structure portion on which the substrate is positioned, and has the second resin layer adhered to the sealing material.

Assignees

• Fujifilm Corp

Inventors

• Isobe Yu

Classifications

• B29K2067/00

  Use of polyesters {or derivatives thereof}, as moulding material · CPC title

• H01L31/049 Primary

  Electricity · mapped topic

• H01L31/0481

  Electricity · mapped topic

• B29C55/14

  successively · CPC title

• B29C37/0025

  Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing (moulding on preformed layers as inserts B29C70/68; applying fluent material to surfaces in general B05) · CPC title