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《工程(英文)》 >> 2020年 第6卷 第12期 doi: 10.1016/j.eng.2020.02.020

离聚物基封装胶膜的吸湿解吸——一种用于CIGS 薄膜光伏组件的自呼吸封装胶膜

NICE Solar Energy GmbH, Schwaebisch Hall 74523, Germany

收稿日期: 2019-09-02 修回日期: 2020-01-16 录用日期: 2020-02-27 发布日期: 2020-10-30

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摘要

本文引入了一种创新的基于离聚物的多层封装胶膜用以代替传统双层玻璃光伏组件的封装材料。利用该封装胶膜,在不需要额外的边缘密封的情况下就能防止水汽渗透。本文分析了这种封装胶膜及其原料——聚(乙烯-共丙烯酸)和离聚物——在不同气候条件下的自发吸湿和解吸。相对空气湿度是这些逆过程的热力学驱动力,并决定了其平衡含水率(equilibrium moisture content, EMC)。空气湿度越大,EMC也越大。被吸收的水分子的均质化是一个扩散控制过程,其中温度起主要作用。然而,其在较高温度下扩散系数仍相对较低。我们认为,当光伏组件在正常气候条件下使用时,基于离聚物的封装胶膜可“呼吸”水汽,即在白天相对湿度较高时,它会“吸入”(吸收)水分并将其限制在组件的外边缘内,而在夜晚相对湿度较低时,它则会“呼出”(解吸)水分。通过这种方式,封装胶膜可以保护电池免受水汽的侵入。

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