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Back film of solar cell and preparing technique thereof

A technology for solar cells and production processes, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of insufficient adhesion strength between thin film layers, single structure of the back film of solar panels, and retention of air bubbles.

Inactive Publication Date: 2011-02-02
ZHEJIANG VENTURA PHOTOVOLTAIC MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a new solar cell panel with defects such as the single structure of the back film of the existing solar panel, insufficient bonding strength between the film layers, and easy formation of air bubbles between the layers. Solar panel back film and its production process

Method used

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  • Back film of solar cell and preparing technique thereof
  • Back film of solar cell and preparing technique thereof
  • Back film of solar cell and preparing technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Treat the surface of the PET film with a thickness of 150 μm with a surfactant, then wash it with deionized water to remove the oil on the surface of the film, and dry it for later use.

[0078] The polycrystalline epoxy resin is melted at 80-100°C, and a layer of adhesive is coated on the treated PET surface by roller coating, and the thickness after drying at 150°C is about 2 μm.

[0079] Polyvinyl fluoride (PVF) particles, propylene glycol methyl ether, amino resin and titanium dioxide (TiO 2 ) according to the ratio of 35:30:5:30, uniformly mixed in a glass bead sand mill, and sanded for 0.5 hours to form a mixed solution with good leveling, fineness less than 25 microns and moderate viscosity, and then heated to 170 degrees Celsius , using a roller coating method to apply a layer of fluoropolymer coating on adhesive-treated PET film. After baking at a temperature of 170 degrees Celsius for 10 minutes, the solvent in the fluoropolymer coating evaporates to form a f...

Embodiment 2

[0086] Polyvinylidene fluoride (PVDF) particles, propylene glycol methyl ether, polyester resin and titanium dioxide (TiO 2 ) according to the ratio of 35:30:5:30, uniformly mixed in a glass bead sand mill, and sanded for 1 hour to form a mixed solution with good leveling, fineness less than 25 microns and moderate viscosity, and then heated to 160 degrees Celsius , A layer of PVDF coating was applied on a clean PET film (about 150 μm in thickness) by roller coating. After baking at a temperature of 150 degrees Celsius for 10 minutes, the solvent in the PVDF coating volatilizes to form a PVDF film with a thickness of about 20 μm.

[0087]If one-side coating is adopted, repeat the above PVDF coating steps, and also coat the PVDF film on the other side of the film.

[0088] A layer of polycrystalline epoxy resin with a thickness of about 1 μm was coated on the fluorine-containing coating by scraping. After drying at 150°C, a formal solar cell back film product is obtained.

...

Embodiment 3

[0091] The PET film with a thickness of 120 μm was destaticized on the surface by electric ironing, and then a layer of EVA adhesive was applied on the PET surface by brushing, and the thickness after drying at 120°C was about 2 μm.

[0092] Polytetrafluoroethylene (PTFE) particles, butyl ether acetate, amino resin, titanium dioxide (TiO 2 ) and carbon black in a ratio of 35:30:4.5:30:0.5, uniformly mixed in a glass bead sand mill, and sanded for 1 hour to form a mixed solution with good leveling, fineness less than 25 microns, and moderate viscosity, Then it was heated to 180 degrees Celsius, and a layer of PTFE coating was coated on the PET film (about 124 μm in thickness) coated with EVA glue by rolling coating. After baking at a temperature of 150 degrees Celsius for 10 minutes, the solvent in the PTFE coating evaporates to form a film with a thickness of about 20 μm.

[0093] If the single-side coating method is adopted, repeat the above-mentioned PTFE coating steps, and...

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Abstract

The invention discloses a solar panel back film and a technique for manufacturing the same. The back film comprises a PET film substrate with thickness of between 100 and 350 micrometers, wherein, fluoropolymer coatings with thickness of between 15 and 30 micrometers are coated on both sides of the substrate; an adhesive layer with thickness of between 0.5 and 5 micrometers is coated on the fluoropolymer coating on one side; the fluoropolymer coatings are obtained by direct coating of mixed latex which is obtained through mixture of various raw material compositions according to the mixture ratio and subsequent grinding treatment on the PET film substrate; the compositions by mass ratio of the raw materials of the fluoropolymer coatings are 30 to 55 percent of fluoride coating materials, 20 to 40 percent of solvent, 2 to 6 percent of cross-linking agent and curing agent and 15 to 40 percent of filling. The technique greatly improves the bonding strength between a back film layer and alayer, improves the ageing resistance, the weathering resistance of products, simultaneously improves the insulativity and the vapor permeability resistance due to the design of a multilayered structure and also can design and modify the performance and the appearance of the products as required.

Description

(1) Technical field [0001] The invention relates to a solar panel back film and a production process thereof. (2) Background technology [0002] Energy is the basis of production and social activities in modern society. Traditional fuel energy is decreasing day by day, facing the danger of depletion. On the other hand, carbon dioxide, sulfur and nitrogen oxides emitted from fuel combustion will cause the greenhouse effect and acid rain, deteriorating the global environment. Energy issues have become a global issue that cannot be ignored. Finding new energy sources has become a top priority. The abundant solar radiation energy is inexhaustible and inexhaustible. It is the energy that human beings can use freely and has become the best choice for people. If 0.1% of the solar energy on the earth's surface is converted into electrical energy, the conversion rate is 5%, and the annual power generation is equivalent to about 40 times of the world's current energy consumption. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/12B32B33/00B05D3/00B05D7/24H01L31/0203C08J5/18C09J163/00H01L31/18C09J133/00H01L31/048B32B27/06C09J123/08H01L31/049
CPCY02E10/50
Inventor 王洪钧王连邦张云云郭昕
Owner ZHEJIANG VENTURA PHOTOVOLTAIC MATERIALS
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