| Abstract |
Electrochemical Impedance Spectroscopy (EIS) has become a popular analytical technique for research anddevelopment of battery cells' chemistries, due to the established, high precision computer controlledequipment, that are capable of direct, on-line monitoring of performance parameters or degradation of anelectrochemical system. Used for Lithium-ion (Li-ion) batteries, this method allows for a fast and accurateassessment of the battery's impedance at any working point, without modifying the state of the battery.The influence of the operating conditions, state of charge (SOC) and temperature on the performance of acommercially available 53 Ah Lithium polymer battery cell, manufactured by Kokam Co. Ltd., isinvestigated in laboratory experiments, at its beginning of life, by means of EIS. A data fitting algorithm wasused to obtain the parameter values for the proposed equivalent electrical circuit, which was further selectedfor the development of an accurate EIS based performance model for the chosen Li-ion battery cell. |
