Solar cell back plate, preparation method of same and solar cell component

A technology for solar cells and backsheets, applied in the field of solar cells, can solve problems such as increased water vapor transmission rate, poor bonding performance, and easy moisture and heat aging, and achieve improved bonding performance, increased service life, and resistance to water vapor transmission sexually superior effect

Active Publication Date: 2013-06-26
BYD CO LTD
7 Cites 2 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems of poor bonding performance between layers of the solar cell back sh...
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Method used

As can be seen from the test results of the above table 1, the solar cell backboard S1-S3 provided by the invention, relative to various backboards DS1-DS3 in the prior art, between each layer of the backboard before and after the wet heat treatment It has good bonding performance, and has good water vapor transmission resistance before and after wet heat treatment. In addition, in the present invention, since the mixture of EVA and polyolefin is used for the moisture and heat resistant layer, the cost is greatly reduced; while the back sheet DS3 prepared in Comparative Example 3 also has good water vapor permeability resistance, but its both sides are uniform. The costly fluorine-containing coating is used, and when the back sheet DS3 is assembled into a solar cell module, EVA needs to be used to bond the back sheet and the battery, so the cost is relatively high.
In the present invention, heat-and-moisture-resistant layer 4 is set on another surface of insulating substrate layer 2, and heat-and-moisture-resistant layer 4 is the mixture containing ethylene-vinyl acetate copolymer (EVA) and polyolefin, so that the solar energy of the present invention Even after the battery backsheet 100 is aged by humidity and heat, the mo...
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Abstract

The invention provides a solar cell back plate. The solar cell back plate comprises a fluorine-containing polymer paint curing coating layer, a polyurethane coating layer, an insulating substrate layer, an adhesive layer and a heat-moisture resistant layer from downside to upside, wherein the heat-moisture resistant layer is a mixture containing ethylene-vinyl acetate copolymer and polyolefin. The invention also provides a preparation method of the solar cell back plate and a solar cell component adopting the solar cell back plate. The solar cell back plate provided by the invention has excellent adhesion performance between the layers, good water steam resistant permeability before and after the heat-moisture treatment, and low cost.

Application Domain

Synthetic resin layered productsPhotovoltaic energy generation +1

Technology Topic

ChemistryPolyolefin +8

Image

  • Solar cell back plate, preparation method of same and solar cell component
  • Solar cell back plate, preparation method of same and solar cell component
  • Solar cell back plate, preparation method of same and solar cell component

Examples

  • Experimental program(3)
  • Comparison scheme(3)
  • Effect test(1)

Example Embodiment

[0041] Example 1
[0042] (1) Preparation of fluorine-containing coatings: 100 parts by weight of tetrafluoroethylene copolymer (Daikin Industry Co., Ltd., Zeffle GK570, solid content 65wt%), 30 parts by weight of titanium dioxide (DuPont, R706), 10 parts by weight of acetic acid After the butyl ester was pre-mixed under stirring, 150 parts by weight of 0.20 mm zirconia beads were added, and the pigment dispersant was used to disperse at a speed of 3000 rpm for 30 minutes. Then, the zirconia beads were filtered out with a 200-mesh sieve, and 10 parts by weight of an isocyanate curing agent (Bayer, N3390) was added to obtain the white fluorine-containing paint of this embodiment.
[0043] (2) Preparation of polyurethane coating: 100 parts by weight of polyester resin (Toyobo, 680 resin) was dissolved in 300 parts by weight of ethyl acetate, and then 10 parts by weight of isocyanate curing agent (Bayer, N3390) was added to obtain this Examples of polyurethane coatings.
[0044] (3) Preparation of moisture and heat resistant film: 100 parts by weight of EVA (VA content 12wt%, Korea Hyundai EF443) and 48 parts by weight of titanium dioxide (DuPont R960) were blended and granulated, and then mixed with 500 parts by weight of polyethylene PE and 1 weight part A stabilizer (Taiwan Double Bond, CHISORB770) was blended and extruded into a film to obtain a heat and humidity resistant film with a film thickness of 100 μm.
[0045] (4) Backsheet molding: Corona treatment is performed on the insulating substrate PET film (Jiangsu Yuxing Film Technology Co., Ltd., CY11) with a thickness of 120 μm, and then the polyurethane coating in step (2) is coated on one surface of the PET film, After curing, a polyurethane coating with a thickness of 5 μm is formed on the surface of the PET, and then the fluorine-containing coating in step (1) is coated on the polyurethane coating, and a cured coating of fluorine-containing polymer coating with a thickness of 25 μm is formed after curing. Coat the other surface of the PET film with DIC adhesive (main agent TSB-500C/curing agent TSH-901C=10/1 solution) to form a coating amount of 10g/m 2 , an adhesive layer with a thickness of 9 μm, and finally attach the moisture-resistant film in step (3) to obtain the solar cell backsheet of this embodiment, denoted as S1, with figure 2 structure shown.

Example Embodiment

[0058] Example 2
[0059] The same steps as in Example 1 were used to prepare the solar cell backsheet S2 of this example, the difference being that:
[0060] In step (3), the amount of EVA used is 300 parts by weight, wherein the content of VA is 5 wt%.

Example Embodiment

[0061] Example 3
[0062] The same steps as in Example 1 were used to prepare the solar cell backsheet S3 of this example, the difference being that:
[0063] In step (2), 0.5 parts by weight of carbodiimide and 1.0 parts by weight of fumed silica are also added to the polyurethane coating.

PUM

PropertyMeasurementUnit
Thickness15.0 ~ 40.0µm
Thickness1.0 ~ 10.0µm
Thickness90.0 ~ 150.0µm

Description & Claims & Application Information

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