As we all know, energy crises is becoming more serious day by day,all countries in the world are looking for new energy resource as one of main measures of the economic development. Solar energy,a permanent energy without any pollution, is widely used in civil industry, auto-manufacture, aviation and spaceflight area. Solar battery, which is diffusely used in aviation, spaceflight, power for industry and agriculture, lighting and otherwise, is one approach of using solar energy.
Solar battery back sheet is indispensable component of solar battery. They are used to rivet the battery and keep resisting illumination.
about 1818MW solar batteries were produced over the world in 2005, among which, 1666MW came from the top 10 manufactures.The top 10 of Chinese battery manufacturers (including Taiwan MAODI) produced 142MW, account for 7.8 percent of world total output.In these 10 enterprises, Wuxi Shangde and Jiangxi Saiwei have the fast output growth.In recent years, lots of solar battery manufacturers are rapidly developing in the Yangtze River delta, such as Nanjing, Suzhou, Changzhou and Jiangsu. If government carry out appropriate political guidance, their rapidly development will result in China to be the third largest country for photovoltaic industry.
There are lots of solar battery manufacturers over the world, however, Only few can manufacture solar battery, such as Isovolta of Austria. Although Chinese government is increasing investment in photovoltaic industry, but most raw materials for solar battery produce are dependent upon importation from foreign countries. Thus, market prospect of solar battery back sheet is very favorable, more and more enterprises from home and abroad start to focus on this market.
1、components
Solar battery back sheet (TPT) consist of 3 film layers, the outer layer is T film, the middle one is P film, these 2 films are cemented by glue-water.
The T film means polyethylene film, about 37um thick. This film is used to encapsulate solar battery, as it can resist High-temperature, UV, aging and illumination.
The P film indicates polyester film, about 250um thick, Its function is hydrosphere and electricity isolation, measurement stabilization.
2、Technical requirement
Material specific technical requirements are as follows:
Item
Unit
value
Test method
TPTThickness
μm
350
PVF Film thickness
μm
37
PET Film thickness
μm
250
PVF Film thickness
μm
37
Interlamination peeling strength(PVF-PET)
N/5cm
≥20
IPV NO.38
Glue peeling strength
N/cm
≥40
IPV NO.70
WVTR
g/m2d
~0.7
ISO 15106-3
weatherability
No stratification(2000h,85%rh,85℃)
IEC61215
breakdown voltage
KV
~28
IEC60243-1
color: white black and so on 3、technology parameter of CY25(solar TPT back sheet film)
