层压和储存条件对太阳能电池用聚烯烃封装胶膜透光率的影响研究

Study on effects of lamination and storage conditions on light transmittance of polyolefin encapsulated film for solar cell

采用紫外可见分光光度计,结合封装胶膜交联度曲线,研究了层压和储存条件对太阳能电池用聚烯烃封装胶膜透光率的影响。研究结果表明:通过提升层压温度和总层压时间,以及采用冰水冷却方式,均可提升聚烯烃封装胶膜的透光率,这三种方式均通过降低封装胶膜的结晶度来提升透光率。当层压温度为150℃时,封装胶膜透光率为91.39%,相对于层压温度为120℃时高出1.02个百分点;当总层压时间为25 min时,封装胶膜透光率为91.28%,相对总层压时间为10 min时高出0.75个百分点;采用冰水冷却方式,封装胶膜透光率为91.90%,相对于采用常温冷却方式高出0.53个百分点。采用低温且闭光的储存方式对聚烯烃封装胶膜进行储存,能有效缓解因助剂迁移和材料老化导致封装胶膜透光率的下降。

Using ultraviolet-visible spectrophotometer,combined with crosslinking degree curve of the encapsulated film,the effects of lamination and storage conditions on light transmittance of polyolefin encapsulated film for solar cell were studied.The research results showed that the light transmittance of polyolefin encapsulated film could be improved by increasing the lamination temperature and total lamination time,and using ice water cooling method.These three methods all improved the light transmittance by reducing the crystallinity of the encapsulated film.When the lamination temperature was 150℃,the light transmittance of the encapsulated film was 91.39%,which was 1.02 percentage points higher than that of the film when the lamination temperature was120℃.When the total lamination time was 25 min,the light transmittance of the encapsulated film was 91.28%,which was 0.75 percentage points higher than that of the film when the total lamination time was 10 min.Using ice water cooling method,the light transmittance of the encapsulated film was 91.90%,which was 0.53 percentage points higher than using normal temperature cooling method.The storage of the polyolefin encapsulated film by low temperature and light closed storage method could effectively alleviate the decrease in the light transmittance of encapsulated film due to the migration of additives and material aging.