The effect of soldering process on solar module performance

The aim of this work is to investigate the effect of soldering technology on solar module performance and reliability. In this study, the flux, the soldering temperature of soldering iron, and the annealing process during soldering process are investigated. Through a series of experiments, some meaningful conclusions which agree with practical production can be summarized as follows: it will be hard to joint if the flux with a low activity, while a too high activity will lead to corrosion at the same time; the optimal soldering temperature range is between 330~350 °C, which causes a low cell breakage rate and a high adhesion; annealing process can lead to less cell crack and low breakage rate by making copper more softer. These results have guiding significance for improving solar module manufacture and further enhancing module reliability and performance.