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Sealing films for solar cell and solar cell employing the sealing films
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A technology for solar cells and sealing films, which is applied in the fields of solar cell sealing films and solar cells, can solve problems such as lowered sunlight transmittance, yellowing of films, and poor appearance, and achieve improved heat resistance, inhibition of yellowing, The effect of improving light resistance
Inactive Publication Date: 2012-04-25
BRIDGESTONE CORP
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Furthermore, when the solar cell is used for a long period of time, due to the influence of light and heat, the EVA film for sealing is yellowed, the phenomenon that the transmittance of sunlight is reduced, and the problem of poor appearance caused by the yellowing can be seen.
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Embodiment 1
[0085] [EVA resin composition formulation 1 (parts by mass)]
[0086] EVA resin: 100
[0087] (Vinyl acetate content 28% by weight, melt flow rate 15 g / 10 minutes)
[0093] Using the EVA resin composition of the above formula, calendering at 80° C. to form an EVA film. The thickness of the film was 600 μm.
[0094] The obtained EVA film is used as the EVA film 3A for surface side sealing and the EVA film 3B for back side sealing, such as figure 1 As shown, a silicon power generating element 4 was sealed between a glass plate 1 with a thickness of 3 mm and a back cover 2 made of a fluorinated polyethylene film with a thickness of 38 μm to manufacture a solar cell. In addition, the sealing was carried out by heat-compression bonding in a vacuum laminator at a tempe...
Embodiment 2
[0098] [EVA resin composition formulation 2 (parts by mass)]
[0108] Using the EVA resin composition of the above formula, calendering at 80° C. to form an EVA film. The thickness of the film was 600 μm.
[0109] The obtained EVA film is used as the EVA film 3A for surface side sealing and the EVA film 3B for back side sealing, such as figure 1 As shown, a silicon power generating element 4 was sealed between a glass plate 1 with a thickness of 3 mm and a back cover 2 made of a fluorinated polyethylene film with a thickness of 38 μm to manufacture a solar...
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Abstract
The present invention provides sealing films for solar cells, the films being improved in heat resistance and light resistance, and a solar cell made by using the same. One of the sealing films for solar cells comprises an ethylene / vinyl acetatecopolymer and an organic peroxide, and is characterized in that the organic peroxide is a specific peroxyester and that the film contains a dihydroxydimethoxybenzophenone ultraviolet absorber for yellowing prevention and contains substantially no hindered amine light stabilizer. Another sealing film for solar cells comprises an ethylene / vinyl acetatecopolymer and an organic peroxide, and is characterized in that the organic peroxide is a specific dialkylperoxide and that the film contains a dihydroxydimethoxybenzophenone ultraviolet absorber for yellowing prevention and contains substantially no monohydroxyalkoxybenzophenone ultraviolet absorber.
Description
technical field [0001] The present invention relates to a sealing film for a solar cell mainly composed of an ethylene-vinyl acetatecopolymer and a solar cell using the sealing film, and particularly relates to a sealing film for a solar cell and a solar cell excellent in yellowing resistance. Background technique [0002] In recent years, solar cells that directly convert sunlight into electrical energy have attracted attention from the viewpoints of efficient use of resources and prevention of environmental pollution, and are being developed. [0003] Solar cells are usually figure 1 As shown, its structure is: between the glass substrate 1 as the surface side transparent protection member and the rear side protection member (back cover) 2, through the sealing films 3A, 3B of EVA (ethylene-vinyl acetate copolymer) film, Cells 4 for solar cells such as silicon power generation elements are sealed. Hereinafter, the sealing film disposed on the light-receiving side of the ...
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