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Back-protective sheet for solar cell and solar cell module employing the same

A technology for solar cells and backside protection, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of inability to obtain backside protection sheet cost, rising film cost, high thermal shrinkage rate, etc. Excellent stability, environmental adaptability and excellent dimensional stability

Inactive Publication Date: 2008-05-07
TOPPAN PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solar cell back sealing film (back protection sheet) uses a biaxially stretched PET film that has improved environmental resistance such as hydrolysis resistance and weather resistance unique to PET films. However, biaxially stretched PET films are hot The shrinkage rate is large, especially in the process of large-scale solar cell modules, the wiring may be bent, resulting in misalignment of the cells
In order to solve the problem of shrinkage of the film due to the thermal shrinkage rate, it is necessary to perform a thermal fixation process of annealing the stretched film on the equipment, which increases the cost of the film, and therefore, it is impossible to obtain an inexpensive back protection sheet. cost issues
[0010] As described above, the actual situation is that it is not yet possible to obtain sufficient environmental adaptability such as hydrolysis resistance and weather resistance, dimensional stability, and other properties such as heat resistance, moisture resistance, gas barrier properties, A solar cell back protection sheet that can be produced inexpensively and has various properties such as physical strength

Method used

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  • Back-protective sheet for solar cell and solar cell module employing the same
  • Back-protective sheet for solar cell and solar cell module employing the same
  • Back-protective sheet for solar cell and solar cell module employing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Fabrication of a plastic film substrate in which the gas-barrier vapor-deposited film shown below is laminated on one side of an unstretched transparent polybutylene terephthalate (PBT) film with a thickness of 50 μm by the T-die method The back surface protection sheet for solar cells of this invention of the following structures.

[0096] Unstretched transparent PBT film (50μm) / gas barrier vapor deposition film

[0097]

[0098] A gas-barrier vapor-deposited film having the structure shown in FIG. 5 was produced. As the plastic substrate 2a, on one side of a biaxially stretched polyethylene terephthalate (PET) film with a thickness of 12 μm, a coating with a thickness of 0.2 μm (dry film thickness) was formed as the bottom layer 2b by gravure coating. Primer A. Then, on the bottom layer 2b, metal aluminum was evaporated and oxygen gas was introduced therein using an electron beam heating method vacuum evaporation apparatus, and aluminum oxide (Alumina) was evapo...

Embodiment 2

[0102]Except that in Example 1, instead of the unstretched transparent PBT film with a thickness of 50 μm made by the T-die method, an unstretched white PBT film with a thickness of 50 μm mixed with white pigments made by the T-die method was used. In Example 1, a back surface protection sheet for a solar cell having the following structure of the present invention was produced in the same manner.

[0103] Unstretched white PBT film (50μm) mixed with white pigment / Gas barrier vapor deposition film

Embodiment 3

[0105] Same as Example 1 except that in Example 1, instead of the unstretched transparent PBT film with a thickness of 50 μm produced by the T-die method, an unstretched foamed PBT film with a thickness of 75 μm produced by the T-die method was used. The back surface protection sheet for solar cells of this invention of the following structure was produced in this way.

[0106] Unstretched foamed PBT film (75μm) / Gas barrier vapor deposition film

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Abstract

The present invention provides a back-surface protective sheet for solar cells which can withstand the severe natural environment over long. In particular, it has been improved in environmental resistance, e.g., hydrolytic resistance and weatherability, and in dimensional stability. It is excellent in other various properties including heat resistance, moisture resistance, gas-barrier properties,and physical strength. It can be produced at an extremely low cost. The sheet is a back-protective sheet for use in solar cells, and is characterized by comprising an unstretched transparent polybutylene terephthalate film and, superposed thereon, a vapor-deposited gas-barrier film comprising an inorganic oxide, the vapor-deposited gas-barrier film being disposed on the solar cell element side.

Description

technical field [0001] The present invention relates to the ability to withstand harsh natural environments for a long time, especially to improve and improve environmental adaptability and dimensional stability such as hydrolysis resistance or weather resistance. In addition, as other characteristics, in terms of heat resistance , Moisture resistance, gas barrier properties, physical strength and other characteristics are excellent, and the back surface protection sheet for solar cells and the solar cell module can be manufactured at very low cost. [0002] This application claims priority based on Japanese Patent Application No. 2005-101264 filed on March 31, 2005 and Japanese Patent Application No. 2006-020347 filed on January 30, 2006 in Japan, and the contents thereof are incorporated herein. Background technique [0003] In recent years, attention to global warming has been increasing from both internal and external aspects, and various efforts have been made to suppre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/04H01L31/042
CPCY02E10/50
Inventor 示野郁乃辻井笃
Owner TOPPAN PRINTING CO LTD