Impedance Changes of the Li-ion Cell in the Course of Discharge

Abstract The paper deals with the measurement of the cell impedance parameters during discharging of the Li-ion NCR18650B cell. Re (Z) and Im (Z) of the battery were measured by PEIS method. Results of the impedance changes during discharging and charging were plot to Nyquist diagrams. Important values Rs, Rsei, Rct, Csei, Qsei, Cdl α and σ were found during discharging of the Li-ion cell with and without using CPE element.