Technology:
The sealant of
solar battery plays the role of adhesive of the back sheet that protects the
cells from heat and salinity. Currently, a synthetic resin called ethylene-vinyl
acetate (EVA) is widely used as the material of the sealant. However, EVA might
cause electric leakage inside the solar battery and decrease the output because
it is easily permeated by moisture. Dainippon Printing used polyolefin in place
of EVA for its sealant because it is not so easily permeated by moisture as
EVA. However, polyolefin resin is liable to break and lose transparency as heat
resistance increases, resulting in poor intake of sunlight. This is why EVA is
more popular than polyolefin. Dainippon overcome the drawback of polyolefin by
improving the blending of materials. Its new sealant has 10 times higher
ability to block moisture than the existing sealant and avoids power decline
due to leakage.
Because Dainippon
got favorable responses from customers that have been testing the new sealant,
it will mass produce the new sealant in its existing plants instead of building
a new plant for it. The price will be the same as the existing sealant, the
company said. The company is also scheduled to mass produce new back sheets
with improved insulating performance. According to Japan Photovoltaic Expansion Center, the average price of a residential photovoltaic generation system in
the second quarter of this year decreased 10% from the same period of the
previous year to 500,000 yen per kW mainly because of the price competition
with products from China. A research company in Tokyo forecasts that the world
market of materials of solar battery will increase 2.7 times over the level in
2010 to about 6,800 billion yen in 2020. All Japanese companies involved in the
photovoltaic generation business are busily occupied with the development of
even higher performance products that can be offered at a more competitive
price.
Sealant of solar battery
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