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Effects of temperature on dynamic characteristics of li-ion batteries in electric vehicle applications

Temperature is a key factor that influences the dynamic performance of lithium-ion batteries. The purpose of this study is to investigate the effects of temperature on dynamic characteristics of lithium-ion battery. In this article, the charge and discharge behaviors are studied through battery tests at different temperatures. Based on the tests, the maximum available charge and discharge capacity is analyzed. A model-based subspace identification algorithm is adopted to investigate the quantitative effects of temperature on internal resistance and polarization. Results show that both internal resistance and polarization time increase as the temperature decreases. This explains the reason for difference in dynamic characteristics of lithium-ion battery at different temperatures.