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Solar cell back film with high weather resistance and high water vapor barrier property and preparation method of solar cell back film

A solar cell and water vapor barrier technology, applied in the field of solar cells, can solve problems such as yellowing, air bubbles, and electrode corrosion

Inactive Publication Date: 2020-02-07
JOLYWOOD SUZHOU SUNWATT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that photovoltaic module encapsulation film (such as EVA film) will undergo hydrolysis reaction in a long-term humid and hot environment, resulting in yellowing, delamination, air bubbles, electrode corrosion and PID and other weather resistance problems, which will cause photovoltaic modules to fail ; At the same time, due to the poor weather resistance of the back film of the solar cell, problems such as back film cracking and yellowing will occur during the use of photovoltaic modules, and in severe cases, it will also cause module failure

Method used

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  • Solar cell back film with high weather resistance and high water vapor barrier property and preparation method of solar cell back film
  • Solar cell back film with high weather resistance and high water vapor barrier property and preparation method of solar cell back film
  • Solar cell back film with high weather resistance and high water vapor barrier property and preparation method of solar cell back film

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preparation example Construction

[0047] The present invention also provides a method for preparing a back film of a solar cell with high weather resistance and high water vapor barrier, comprising the following steps:

[0048] (1) Fix a weather-resistant metal film or a weather-resistant metal coating on one side of the support layer;

[0049] (2), fixing a weather-resistant polymer film or a weather-resistant polymer coating on the other side of the support layer;

[0050] (3), post-processing.

[0051] Wherein, the method also includes:

[0052] A weather-resistant coating for metal or a weather-resistant polymer film for metal is fixed on one side of the metal film or the weather-resistant metal coating.

[0053] Wherein, the adhesive is set, and the adhesive is left to stand or matured to fix the weather-resistant polymer film or the weather-resistant metal film on the support layer; One or any combination of coatings to fix the weather-resistant polymer coating on the support layer; through magnetron ...

Embodiment 1

[0056] On one side of the support layer 1 with polyethylene terephthalate as the main material and a thickness of 250-300 μm, a layer of gold, silver, The weather-resistant metal film 2 with copper, iron and aluminum as the main material obtains the semi-finished product a1;

[0057] Place the semi-finished product a1 in a constant temperature environment of 40-80°C for 24-72 hours to obtain the semi-finished product a2;

[0058] One side of the metal film 2 of the semi-finished product a2 is coated with a thickness of 15-20 μm by roller coating, and modified polytetrafluoroethylene resin, modified polytetrafluoroethylene alkoxy resin, modified ethylene-tetrafluoroethylene The mixture of copolymer resin, modified fluoroolefin-vinyl ether copolymer resin, modified weather-resistant polyester and modified polyacrylic resin is a reactive polymer with curable groups as the main body, adding specific metal adhesion promotion The weather-resistant coating 3 for metals prepared with...

Embodiment 2

[0062] On one side of the support layer 1 with polyethylene terephthalate as the main material and a thickness of 250-300 μm, a layer of gold, silver, The weather-resistant metal film 2 with copper, iron and aluminum as the main material obtains the semi-finished product a1;

[0063] On one side of the metal film 2 of the semi-finished product a1, fix a layer of weather-resistant polymer film 3' for metal with a thickness of 20-38 μm and made of polyvinyl fluoride or polyvinylidene fluoride as the main material by adhesive bonding. , get the semi-finished product a2;

[0064] Place the semi-finished product a2 in a constant temperature environment of 40-80°C for 24-72 hours to obtain the semi-finished product b;

[0065] On the untreated side of the support layer 1 of the semi-finished product b, a layer of thickness of 10-15 μm is coated by roller coating, and modified polytetrafluoroethylene resin, modified polytetrafluoroethylene alkoxy resin, modified ethylene-tetrafluoro...

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Abstract

The invention relates to a solar cell back film with high weather resistance and high water vapor barrier properties and a preparation method of the solar cell back film. The solar cell back film comprises a first weather-resistant layer, a second weather-resistant layer, a third weather-resistant layer and a supporting layer, wherein the supporting layer is arranged between the first weather-resistant layer and the second weather-resistant layer; the first weather-resistant layer is made of a weather-resistant polymer film or a weather-resistant polymer coating; the second weather-resistant layer is made of a weather-resistant metal film or a weather-resistant metal coating film; and the third weather-resistant layer is made of a weather-resistant coating for metals or a weather-resistantpolymer film for metals. The solar cell back film has the beneficial effects that a high polymer material with high weather resistance is combined with a metal material with high water vapor barrierproperties to prepare the solar cell back film with the water vapor transmittance of less than or equal to 0.01g / m<2>.d<-1> and excellent weather resistance, so that the problem that a photovoltaic module is easy to fail due to poor weather resistance of a packaging material in an outdoor use process can be effectively solved; and meanwhile, the high-weather-resistance coating can well protect themetal material from being rusted for a long time in an outdoor environment.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a solar cell back film with high weather resistance and high water vapor barrier and a preparation method thereof. Background technique [0002] In recent years, with the increasing awareness of environmental protection and the implementation of many countries' policies to restrict fossil fuel gas emissions, the collection and utilization of renewable energy has increasingly become the focus of attention. Due to its inexhaustible and stable sources, solar photovoltaic power generation has become one of the most promising renewable energy sources. The core of solar photovoltaic power generation is solar photovoltaic modules, which are laminated at high temperature from top to bottom by five parts: glass front plate, encapsulation film, solar crystalline silicon cell, encapsulation film and solar cell back film. sandwich-like structure. As one of the important auxiliary mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/082B32B15/085B32B15/088B32B15/09B32B15/18B32B15/20B32B27/08B32B27/20B32B27/30B32B27/32B32B27/34B32B27/36B32B33/00B32B37/12B32B37/24B32B38/00H01L31/049B29D7/01B32B7/12
CPCB29D7/01B32B7/12B32B15/082B32B15/085B32B15/088B32B15/09B32B15/18B32B15/20B32B27/08B32B27/20B32B27/304B32B27/308B32B27/32B32B27/34B32B27/36B32B33/00B32B37/1284B32B37/24B32B38/0004B32B2037/243B32B2037/246B32B2255/10B32B2255/205B32B2255/26B32B2270/00B32B2307/714B32B2307/7246B32B2457/12H01L31/049Y02E10/50
Inventor 林建伟赵磊张付特余艺华
Owner JOLYWOOD SUZHOU SUNWATT
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