An empirical parameter identification method considering hysteresis effects for LiFePO4 battery's electrochemical model

Abstract

Compared with other types of lithium-ion batteries, there is an obvious hysteresis effect in LiFePO4 battery, which leads to inaccurate parameter identification for its mechanical modelling. This article proposes an empirical parameter identification method for the P2D model of LiFePO4 battery, which takes the hysteresis effect into consideration. The proposed method adds a modified zero-state model to describe hysteresis effects during the identification process of lithium intercalation intervals. Simulation results prove that errors of identified parameters under various working conditions are relatively small, and the average relative error is within 0.5 %. The proposed method to compensate for hysteresis effect is relatively simple and easy to implement, and can improve the accuracy and generalization ability of the electrochemical model of LiFePO4 batteries.