Abstract

Keywords: Lithium-ion battery, SOC(state of charge) estimation, coulometric conversion coefficient, LPV(linear parameter-varying) model. Abstract: C/3 discharging rate has been used to define battery nominal capacity in Chinese national standard. According to definition of the battery state of charge by the United States Advanced Battery Consortium, this article proposes that the capacity in different charging or discharging current should be unified to C/3 discharging capacity by the coulometric conversion coefficient. Through parameter identification of battery equivalent circuit model, this paper embeds model parameters to LPV model considering the coulometric conversion coefficient and uses LPV-Kalman to estimate SOC in time. Then, it compares to SOC estimation considering traditional Coulomb efficiency. Experiment shows that, this SOC estimation method has higher accuracy.

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