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Reflective back protection sheet for solar cells

A solar cell, backside protection technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of protecting photovoltaic cells, failure to maintain photovoltaic functions, and easy damage.

Active Publication Date: 2016-08-24
TOYO ALUMINIUM KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when a large amount of filler is mixed into the resin film, even if the surface layer of the back protective film is fully bonded, the resin film itself is easily damaged, which hinders the function of protecting the photovoltaic cell.
In addition, even if the resin film mixed with the filler does not suffer damage such as breakage, if the surface layer is damaged in the thickness direction, even if the adhesion with the sealing material is sufficient, the resin film is peeled off with weak force, and there is a possibility that it cannot be The problem of keeping enough functions as photocells

Method used

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  • Reflective back protection sheet for solar cells
  • Reflective back protection sheet for solar cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The back protection sheet for solar cells used for the solar cell module was produced as follows.

[0066] A back protection sheet was produced, and as its structure, a transmissive layer 1 , a reflective layer 2 , and a protective layer 3 were laminated in this order.

[0067] First, as the reflective layer 2, polyethylene terephthalate resin was mixed with 15 parts of titanium oxide in 100 parts of polyethylene terephthalate resin, and the film was formed by a resin extrusion method using a normal T-die with a thickness of 250 μm. Ethylene diformate film A (PET film).

[0068] Next, as the protective layer 3 , on the surface of the PET film A, a 38 μm Tedlar film (polyvinyl fluoride resin) manufactured by DuPont was bonded by a dry lamination method using a polyurethane adhesive.

[0069] Next, as the transmissive layer 1, on the opposite side of the PET film A, a 50 μm density of 0.94 g / cm was bonded by a dry lamination method using a polyurethane-based adhesive. 3...

Embodiment 2

[0072] As the reflection layer 2, 10 parts of barium sulfate was mixed with 100 parts of polyethylene terephthalate resin, and the thickness of 250 μm polyethylene terephthalate film was formed by the resin extrusion method using a common T-die. The glycol ester film A was prepared in the same manner as in Example 1 except for the above, to produce a back protection sheet for a solar cell, and to laminate a sealing material on the outer surface of the transmissive layer 1 .

Embodiment 3

[0074] Except that the ethylene vinyl acetate copolymer film SB-3 manufactured by TAMAPOLY (タマポリ) Co., Ltd. with a thickness of 50 μm was used as the transmission layer 1, a back protective sheet for solar cells was produced in the same manner as in Example 1. The outer surface is laminated with sealing material.

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Abstract

The present invention provides a back protective sheet for solar cells, which is disposed on the back of a solar cell module, wherein the transmissive layer has sufficient transmittance, the reflective layer has sufficient reflectivity, and at the same time, the transmissive layer bonded with the sealing material The layer has sufficient cohesion, and the part of the transmissive layer which is in contact with the sealing material has sufficient strength. The back protective sheet for solar cells of the present invention is arranged on the back of the solar cell module, and is characterized in that at least a transmissive layer (1), a reflective layer (2) and a protective layer (3) bonded to a sealing material are sequentially laminated to form a structure, so that The transmission layer (1) averagely transmits more than 70% of light with a wavelength of 400nm to 1400nm, and the reflective layer (2) contains white fillers to reflect light with a wavelength of 400nm to 1400nm.

Description

technical field [0001] The invention relates to a solar cell back protection plate for generating electricity through sunlight. Background technique [0002] Currently, semiconductor photovoltaic cells (solar cells) using crystalline silicon are most used as photovoltaic power generation. This photovoltaic cell has glass on the light-receiving surface and a back protection sheet on the opposite surface, and the two surfaces are heat-compressed using a sealing material made of thermoplastic resin such as ethylene-vinyl acetate copolymer (EVA). Then, the sunlight passes through the glass and reaches the photovoltaic cells, where electricity is generated. [0003] Then, with such a photovoltaic cell, the entire solar cell module is not arranged seamlessly when viewed in plan, taking into account wiring and arrangement errors for taking out electricity generated by the photovoltaic cell. That is, when viewed from a plan view, the portion without the photovoltaic cell is a port...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/049H01L31/054B32B7/02B32B27/00C08J5/18
CPCH01L31/049Y02E10/52
Inventor 猿渡昌隆旭洋寺泽孝展
Owner TOYO ALUMINIUM KK
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