Solar cell sealing film and solar cell using the same

Patent metadata

Field	Value
Publication number	US-9293616-B2
Application number	US-201314374946-A
Country	US
Kind code	B2
Filing date	Jan 25, 2013
Priority date	Jan 27, 2012
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

The present invention provides a solar cell sealing film whereby generation of gas is decreased. The solar cell sealing film comprises a resin mixture of an ethylene-vinyl acetate copolymer and a polyethylene, and an organic peroxide. The mass ratio (EVA:PE) of the ethylene-vinyl acetate copolymer (EVA) to the polyethylene (PE) is 8:2 to 3:7, the content of the organic peroxide is 0.1 to 1.0 parts by mass based on 100 parts by mass of the resin mixture, and the gel rate after crosslinking is 20 to 80% by mass.

First claim

What is claimed is:

1. A solar cell sealing film comprising, a resin mixture of an ethylene-vinyl acetate copolymer and a polyethylene, and an organic peroxide,
wherein a mass ratio (EVA:PE) of the ethylene-vinyl acetate copolymer (EVA) to the polyethylene (PE) in the resin mixture is 8:2 to 3:7,
wherein a content of the organic peroxide is 0.1 to 1.0 parts by mass based on 100 parts by mass of the resin mixture,
wherein a gel rate after crosslinking is 30 to 80% by mass, and
wherein the polyethylene is a low density polyethylene (LDPE) having density of 0.910 g/cm 3 or more and less than 0.930 g/cm 3 , or a liner low density polyethylene (LLDPE) having a density of 910 g/cm 3 to 0.940 g/cm 3 .

2. The solar cell sealing film according to claim 1 , wherein a storage elastic modulus (G′) at 80° C. is 1.0×10 6 Pa·s or more.

3. The solar cell sealing film according to claim 1 , wherein a melting point of the resin mixture, which is a temperature at a viscosity of 30,000 Pa·s, is 65 to 105° C.

4. The solar cell sealing film according to claim 1 , wherein a content rate of vinyl acetate in the ethylene-vinyl acetate copolymer is 20 to 35% by mass.

5. The solar cell sealing film according to claim 1 , wherein the solar cell sealing film is a film of a solar cell having a light receiving side transparent protection material, a backside protection material and a photovoltaic element provided therebetween, and is arranged between the photovoltaic element and the back side protection material.

6. A solar cell comprising a photovoltaic element sealed by a solar cell sealing film according to claim 1 .

Assignees

• Bridgestone Corp

Inventors

• Inamiya Takato
• Kataoka Hisataka
• Kaga Norihiko
• TARUTANI Yasunori

Classifications

• H10F19/804 Primary

  Materials of encapsulations · CPC title

• C08L23/0815

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• C08L23/0853

  Ethylene vinyl acetate copolymers · CPC title

• C08L2312/00

  Crosslinking · CPC title

• Y02E10/50

  Photovoltaic [PV] energy · CPC title