Volume 7: Urban Energy Systems: Building, Transport, Environment, Industry, and Integration

Modeling Study of Lithium-ion Battery Below Room Temperature Bingxiang Sun, Zhenlin Zhu, Haijun Ruan, Tong Li, Xitian He, Xiaojia Su, Jian wu, Weige Zhang

Abstract

The battery model is the basis for battery state estimation, and its accuracy will directly affect the accuracy of the estimate. In the field of rail transit, combined with the actual operating conditions of the train to properly allocate the battery capacity, it is also necessary to establish an accurate battery model. At present, the commonly used battery model less considers the influence of temperature on the model parameters[1]. Because of the extreme low temperature conditions during the actual running of the train, this paper uses lithium iron phosphate battery as the research object, based on the second-order equivalent circuit model of the battery[2]. At the same time, considering the influence of low temperature on the available capacity of the battery[3], open circuit voltage, ohmic internal resistance and polarization parameters, a battery model suitable for room temperature below is proposed[4].

Keywords LFP lithium-ion battery, Modeling below room temperature, Nernst equation, Arrhenius formula