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The effect of cooling press on the encapsulation properties of crystalline photovoltaic modules: residual stress and adhesion
Author(s) -
Li HengYu,
PerretAebi LaureEmmanuelle,
Chapuis Valentin,
Ballif Christophe,
Luo Yun
Publication year - 2015
Publication title -
progress in photovoltaics: research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.286
H-Index - 131
eISSN - 1099-159X
pISSN - 1062-7995
DOI - 10.1002/pip.2409
Subject(s) - encapsulation (networking) , materials science , residual stress , photovoltaic system , composite material , computer science , electrical engineering , computer network , engineering
A high‐quality encapsulation process is crucial to ensuring the performance and long‐term reliability of photovoltaic (PV) modules. In crystalline Si technology‐based modules, poly (ethylene‐co‐vinyl acetate) (EVA) is the most widely used PV encapsulant. Its encapsulation process is usually performed in a flat‐bed vacuum bag laminator. In certain types of laminators, cooling press can be applied to the module cooling process after the module encapsulation, leading to a much higher cooling rate (~100 °C/min) than conventional natural cooling due to the application of water cooling circulation and mechanical pressure on the modules. In this work, the effect of the cooling press on the encapsulation properties of PV modules with EVA as the encapsulant are assessed on the aspects of residual stress in the modules, peeling strength between glass and EVA, and the resulting EVA gel content after encapsulation. The results show that the cooling press influences the encapsulation properties of PV modules. In particular by applying the cooling press after encapsulation, the residual normal stress in the Si solar cell in the encapsulated module after cooling can be reduced by as much as 22 ± 2 to 27 ± 3% depending on the EVA gel content, whereas the peeling strength between front glass and EVA is increased by ~ 10%. This work should help the further optimization of PV module encapsulation processes aimed at improving module encapsulation quality. Copyright © 2013 John Wiley & Sons, Ltd.