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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: 2009-10-07
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, similarly to the sealing film of (2), when used for a long period of time, there is also a problem of long-term reliability such as a decrease in the gas barrier property and a decrease in the output of the solar cell module.

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

An object of the present invention is to provide a sealing film for a solar cell module, which uses an inexpensive polyester film with excellent mechanical properties and processability as a base material, and a solar cell module using the same. The technical problem is the reduction of gas barrier properties due to long-term use and excellent long-term reliability. Furthermore, the object is to provide a sealing film imparted with hydrolysis resistance, transparency, weather resistance, and light weight and to use the same of solar modules. The solar cell module sealing film of the present invention comprises a polyester film layer and a layer composed of at least one selected from metals, metal oxides, and inorganic compounds, and the polyester film layer has a temperature of 150° C. in the longitudinal direction and the width direction. The thermal shrinkage rates are all within ±2%, and the difference between the thermal shrinkage rates in the longitudinal direction and the width direction at 150°C is less than 2%. Moreover, the solar cell module of this invention uses the said sealing film for solar cell modules for a front sheet layer and / or a back sheet layer.

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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Patent Type & Authority Patents(China)
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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