A Modeling Method for Lithium-Ion Batteries Based on EIS and FFRLS

Electrochemical impedance spectroscopy can comprehensively describe the dynamic chemical processes of batteries, which is a powerful tool for studying chemical systems such as batteries. In this paper, an electrochemical workstation is used to measure the electrochemical impedance spectrum of lithium battery from 0.01Hz to 1000Hz, and the appropriate fractional second-order model is selected by analyzing the properties of each frequency band of the impedance map. Compared with the traditional integer second-order model, the modeling method proposed in this paper is more accurate and reliable.