Investigation on heat-sealing process of the aluminum plastic composite foil in pouch Li-ion battery

doi:10.3969/j.issn.2095-4239.2016.01.010

Abstract

Abstract: Aluminum plastic composite foil is the common sealing material for Li-ion battery, and its heat-sealing strength can influence the safety performance of batteries directly. In this article, the heat-sealing strength of aluminum plastic foil with different heat-sealing conditions (heat-sealing temperature and heat-sealing time) is studied, and uniaxial tensile tests are done to obtain the highest tensile strength and apparent elastic modulus to study the influences of heat-sealing temperature and heat-sealing time on the heat-sealing strength. It has been found that the heat-sealing strength of the specimens enhances firstly, and then becomes stable to a value with the temperature increasing. However, heat-sealing time has slight influence on the heat-sealing strength at a relative low temperature, while at the relative high temperatures, heat-sealing strength of the specimens enhances with the time extending until it becomes stable to a value. Meanwhile, there is similar influence of heat-sealing temperature and heat-sealing time on the apparent elastic modulus of specimens. It has also been found in the experiments that the tensile failure modes of specimens include interface failure, cohesive failure, peeling failure and root damage, and cohesive failure occurs most in these modes, and root damage occurs more when the heat-sealing time is increasing.

Key words: Li-ion battery, sealing material, aluminum composite foil, heat-sealing strength

CLC Number:

TM911

FAN Yang, GUO Zhansheng, XU Yiwei, FENG Jiemin. Investigation on heat-sealing process of the aluminum plastic composite foil in pouch Li-ion battery[J]. Energy Storage Science and Technology, 2016, 5(1): 85-90.

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