Back sheet for solar cells, and solar cell using same

A solar cell and backplane technology, applied in applications, circuits, electronic equipment, etc., can solve the problems of expensive and weak mechanical strength of fluorine-based resin films, and achieve stable performance, high cost reduction effect, and excellent light reflectivity.

Inactive Publication Date: 2014-03-19
YUPO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since fluororesin films are soft, mechanically weak, and expensive, backsheets in which polyester films are laminated with various properties have been proposed in recent years.

Method used

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  • Back sheet for solar cells, and solar cell using same
  • Back sheet for solar cells, and solar cell using same
  • Back sheet for solar cells, and solar cell using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、2、6、10、11

[0139] Composition (B) obtained by mixing the materials described in Table 1 at the compounding ratio described in Table 2 was melt-kneaded at 250° C. using an extruder. Then, this was extruded into a sheet form and cooled to about 60° C. with a cooling roll to obtain a thermoplastic resin sheet. This thermoplastic resin sheet was reheated to 145° C., and stretched at the ratios listed in Table 2 in the longitudinal direction by utilizing the peripheral speed difference of a plurality of roller groups.

[0140] Next, the composition (A) obtained by using the materials described in Table 1 as described in Table 2 was melt-kneaded at 250° C. using another extruder, and melt-extruded onto the thermoplastic resin sheet obtained above. A laminate with (A) / (B) structure was obtained.

[0141] Next, this laminate was reheated to 160° C., and stretched at the ratios described in Table 2 in the transverse direction by a tenter. Thereafter, after performing annealing treatment at 165°...

Embodiment 3

[0144] Composition (B) obtained by mixing the materials described in Table 1 at the compounding ratio described in Table 2 was melt-kneaded at 250° C. using an extruder. Then, this was extruded into a sheet form and cooled to about 60° C. with a cooling roll to obtain a thermoplastic resin sheet. This thermoplastic resin sheet was reheated to 145° C., and stretched at the ratios listed in Table 2 in the longitudinal direction by utilizing the peripheral speed difference of a plurality of roller groups.

[0145] Next, the composition (A) obtained by using PP1 described in Table 1 was melt-kneaded at 250° C. with another extruder, and melt-extruded on one side of the thermoplastic resin sheet obtained above to obtain a compound having ( Laminates of sequential composition of A) / (B) are passed between embossing rolls (150 lines per 1 inch, gravure (reverse cone) type) formed of rubber rolls and metal rolls, The surface on the side of the adhesive layer formed of the composition ...

Embodiment 4、5

[0149] As the material constituting the adhesive layer (A), the composition (A) described in Table 2 was used, stretched at the magnification described in Table 2, and the surface treatment by corona discharge treatment and surface treatment layer was not performed, except Other than that, the laminated body was obtained by the method similar to Example 1, and this was used as the back sheet for solar cells.

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Abstract

A back sheet for solar cells, which is composed of a laminate that comprises: an adhesive layer (2) which contains 50-100% by weight of a thermoplastic resin and 0-50% by weight of an inorganic or organic filler; and a base layer (1) which contains 30-95% by weight of a polypropylene resin and 5-70% by weight of an inorganic or organic filler, while being at least uniaxially stretched and having a porosity of 55% or less. The back sheet for solar cells has a reflectance of light having a wavelength of 750 nm of 90% or more and a partial discharge voltage of 7.5 V / [mu]m thick or more. Consequently, the back sheet for solar cells has excellent partial discharge voltage and can be reduced in the sheet thickness, while exhibiting excellent adhesion to a sealing material.

Description

technical field [0001] The invention relates to backsheets for the protection of solar modules. In detail, it relates to a backsheet formed of a resin laminate provided on a sealing material on the side opposite to the light incident surface of a solar cell module, which efficiently transfers sunlight passing through the module due to its excellent light reflectance. It is reflected to the side of the power generation element to improve the power generation efficiency, and the generated electricity is not leaked due to the excellent withstand voltage, and the excellent adhesion to the sealing material can withstand long-term outdoor use in solar cells and prevent performance degradation . Furthermore, the present invention relates to a solar cell using the back sheet. Background technique [0002] Solar power generation is a power generation method that uses solar cells to directly convert the energy of sunlight into electricity. As a clean energy source that does not gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/049H01L31/056
CPCY02E10/52B32B2457/12B32B27/32B32B27/20H01L31/0527H01L31/0487B32B7/12B32B27/36B32B15/08B32B27/08B32B27/306B32B2307/514H01L31/049H01L31/056
Inventor 广井洋介饭田诚一郎
Owner YUPO CORP
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