State-of-Health of Lithium-Ion Battery Estimation Method Using Reduced Equivalent Circuit Model(ECM)

摘要

State-of-Health(SOH) indicates a remained capacity and the performance of Lithium-Ion Battery. There are a lot of factors decrease the performance of the battery such as normal ageing, high temperature operation, rapid current charging and others. However, only limited variables are available for measuring that make difficult to direct estimation of SOH. The SOH estimation method based on reduced electrochemical cell model is developed to on-line application. This model consists of semi-empirical model and equivalent circuit model. Moving-horizon parameter estimation method was adopted to minimize error of parameter for semi-empirical model. The results of SOH estimation by model are compared to experiment results under various driving patterns and conditions of lithiumion battery for HEV and PHEV. Consequently, the accuracy is high enough for applied to battery management system in HEV and PHEV as real time on-line SOH estimation.