Encapsulation film for photovoltaic module and photovoltaic module

A solar cell and sealing film technology, applied in electrical components, applications, circuits, etc., can solve problems such as weak mechanical strength of solar cell components, decreased output of solar cell components, damage to solar cell components, etc., and achieve low-cost mechanical properties and long-term reliability Excellent performance and the effect of suppressing the reduction of gas barrier properties

Inactive Publication Date: 2008-09-24
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the mechanical strength of the fluorine-based film is low, the mechanical strength of the solar cell module is weak, and the solar cell element may be damaged.
Furthermore, when a PET film is used, sim...

Method used

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  • Encapsulation film for photovoltaic module and photovoltaic module
  • Encapsulation film for photovoltaic module and photovoltaic module
  • Encapsulation film for photovoltaic module and photovoltaic module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0194] (1) Manufacture of PET polymer

[0195] Mix 64 parts of ethylene glycol in 100 parts (hereinafter referred to as parts by mass) of dimethyl terephthalate, and then add 0.06 parts of magnesium acetate and 0.03 parts of antimony trioxide as a catalyst, while raising the temperature to 150-235 °C while performing the transesterification reaction.

[0196] 0.02 parts of trimethyl phosphate was added thereto, the temperature was gradually increased, the pressure was reduced, and polymerization was performed at a temperature of 285° C. for 3 hours. The intrinsic viscosity [η] of the obtained polyethylene terephthalate (PET) was 0.57. The polymer was cut into pieces with a length of 4 mm.

[0197] The PET obtained above with an intrinsic viscosity [η] of 0.57 was placed in a rotary heating vacuum device (rotary dryer) at a temperature of 220° C. and a vacuum degree of 0.5 mmHg, and heated while stirring for 20 hours. The intrinsic viscosity of PET thus obtained was 0.75. T...

Embodiment 2

[0205] The PET-1 of Example 1 was used, and the conditions for annealing in an off-line state were a temperature of 150° C. and a time of 3 minutes. Other conditions Using the conditions of Example 1, the amount of molten polymer discharged was adjusted so that the film thickness would be 100 μm. The film thus obtained is hereinafter referred to as PET-BO-2. This film was made into a sealing film A under the same method and conditions as in Example 1. The sealing film A thus obtained is referred to as sealing FA-2. The intrinsic viscosity, the total light transmittance of PET-BO-2, and the total light transmittance of sealed FA-2 are the same values ​​as PET-BO-1 and sealed FA-1 of Example 1.

Embodiment 3

[0207] In the method of Example 1, the stretch ratio in the longitudinal direction of the film was 3.5 times, and the stretch ratio in the width direction was 3.5 times, the heat treatment temperature was 220° C., and the relaxation in the width direction was 5%. In addition, the annealing treatment in the off-line state was performed under the conditions of Example 2, and the melt discharge amount of the polymer was adjusted so that the film thickness became 100 μm. The film thus obtained is hereinafter referred to as PET-BO-3. This film was made into a sealing film A under the same method and conditions as in Example 1. The sealing film A thus obtained is referred to as sealing FA-3. Intrinsic viscosity of PET-BO-3, total light transmittance and total light transmittance of sealed FA-3, water vapor transmittance (non-aging treatment product) and PET-BO-1 of embodiment 1, sealed FA-1 are the same value.

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Abstract

Disclosed are: a sealing film which is produced using, as a base material, a polyester film which is inexpensive and has excellent mechanical properties and processability, can prevent the deterioration of a gas-barrier property under long-term use (which is a problem in the prior art) and has excellent long-term reliability; and a solar cell module using the sealing film. Specifically, disclosed are: a sealing film which has hydrolysis resistance, transparency, and weather resistance and is reduced in weight; and a solar cell module using the sealing film. The sealing film comprises: a polyester film layer having heat contraction coefficients of +/- 2% or less at 150 DEG C both in the length-wise and width-wise directions and a difference between a heat contraction coefficient in the length-wise direction and that in the width-wise direction of 2% or less at 150 DEG ; and a layer comprising at least one substance selected from the group consisting of a metal, a metal oxide and an inorganic compound. The solar cell module has the sealing film as a front sheet layer and/or a back sheet layer thereof.

Description

technical field [0001] The present invention relates to a sealing film for a solar cell module and a solar cell module using the sealing film. [0002] More specifically, it relates to a sealing film for a solar cell module that is excellent in reliability such as gas barrier durability and hydrolysis resistance, and is also excellent in transparency, light weight, and high strength, and a solar cell module using the same. Background technique [0003] In recent years, solar cells, which have been developed as next-generation energy sources, have spread rapidly and are being used in residential and industrial fields. [0004] The structure of a solar cell module is generally to combine a plurality of solar cell elements, install a sealing film on both sides of the solar cell element by filling an adhesive resin, and enclose and seal the solar cell element inside the sealing film. (generally, the sealing film disposed on the incident side (surface) of sunlight is referred to...

Claims

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Application Information

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IPC IPC(8): H01L31/042B32B27/36B29C48/305
CPCB32B27/12B32B2367/00B32B17/10018B32B2270/00B32B17/10788B32B2457/12B32B27/08B32B2307/734H01L31/048B32B27/36Y02E10/50B32B27/32B32B27/40H01L31/0481H01L31/049
Inventor 宫治新一郎野口昌和川治直树
Owner TORAY IND INC
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