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Solar cell back panel film and preparation method thereof

A technology for solar cells and backplane films, applied in chemical instruments and methods, circuits, photovoltaic power generation, etc., can solve the problems of fluoroplastics easy to fall off, solvent pollution, solvent residues, etc., to improve overall performance, reliable insulation, and improve Adhesive effect

Active Publication Date: 2015-04-22
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent document CN101177514A (CN200710185202.8) provides a solar cell backsheet, including a substrate and a fluoropolymer layer; the invention mixes fluoroplastics, polymer fillers, inorganic fillers, etc. in a solvent to prepare Fluorine-containing plastic solution, and then mixed with polymer fillers, inorganic fillers, etc. Solvent pollution and other issues, and extremely high requirements for coating technology
[0004] Therefore, a new method is needed to improve the surface adhesion of the fluoroplastic weather-resistant layer to solve the problem that the fluoroplastic as a weather-resistant layer is easy to fall off during use and affects the service life of the battery.

Method used

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  • Solar cell back panel film and preparation method thereof
  • Solar cell back panel film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, a solar battery backsheet film, from top to bottom is the first transition layer 1, the first weather-resistant layer 2, the second transition layer 3, the substrate 4, the third transition layer 5 and the second weather-resistant layer 6 , the substrate 4 is bonded with the second transition layer 3 and the third transition layer 5 through an adhesive layer 7; the first transition layer, the first weather-resistant layer and the second transition layer are cast by three layers of co-extrusion The three-layer composite film layer prepared by the method, the thickness of the three-layer composite film is 25 μm, wherein the thickness of the first transition layer, the first weather-resistant layer and the second transition layer are equal; the third transition layer 5 and the second weather-resistant layer 6 are made by The double-layer composite film is prepared by double-layer co-extrusion casting, and the thickness of the double-layer composite film is 20 ...

Embodiment 2－4

[0038] As described in Example 1, the difference is that polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVDF), titanium dioxide (TiO 2 ) content are 78%, 0, 20%; 58%, 25%, 15%; 58%, 30%, 10%. The bond strength test results of the obtained products are listed in Table 1.

Embodiment 5

[0043] Embodiment 5, as described in Embodiment 1, the difference is:

[0044] The transition layer is polyvinylidene fluoride (PVDF) 30% and polymethyl methacrylate (PMMA) 50%, inorganic filler TiO 2 Nano powder 20% mixture. The polyester base layer 3 is polybutylene terephthalate (PBT) with a thickness of 150 μm. The weather-resistant layer is polyvinylidene fluoride (PVDF). The bonding strength between the upper surface layer (the first transition layer) and the EVA layer of the obtained product is 69N / cm.

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Abstract

The invention relates to a solar cell back panel film and a preparation method thereof. The solar cell back panel film comprises a first transition layer, a first weather-resistant layer, a second transition layer, a substrate, a third transition layer and a second weather-resistant layer from top to bottom, wherein the substrate and the second and third transition layers are bonded by an adhesive layer; the first transition layer, the first weather-resistant layer and the second transition layer are three composite film layers prepared by way of coextrusion casting or film blowing; and the third transition layer and the second weather-resistant layer are two-layer composite films prepared by way of coextrusion casting or film blowing. The solar cell back panel film has the following beneficial effects that the solar cell back panel film has excellent weather resistance; introduction of the transition layers effectively improves the adhesiveness between the back panel film and the EVA adhesive layer as well as between the weather-resistant layers and the substrate; and meanwhile, the back panel film has tight structure, less production processes and low cost and does not cause solvent pollution.

Description

technical field [0001] The invention relates to a solar battery back plate film and a preparation method thereof. technical background [0002] The solar cell backsheet is located on the back of the solar cell panel, which protects and supports the cells, and needs to have reliable insulation, water resistance, and aging resistance. With the rise of the photovoltaic industry in recent years, various companies have proposed various structures for solar photovoltaic cell backplanes. At present, the commonly used structures are TPT structure and TPE structure, among which T refers to DuPont’s Tedlar film, which is composed of polyvinyl fluoride (PVF) film, P refers to polyethylene terephthalate (PET) film, and E refers to vinyl. -Vinyl acetate resin (EVA) film, the three layers of film are bonded with a suitable adhesive, the TPT structure refers to the PVF film / PET film / PVF film structure, and the TPE structure refers to the PVF film / PET film / EVA film structure. However, due...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B7/12B32B37/15H01L31/049
CPCY02E10/50
Inventor 王婧蔡胜梅宗少杰张永明张恒
Owner SHANDONG DONGYUE POLYMER MATERIAL
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