Thomas Landinger received the B.Eng. and M.Eng. degree in electrical engineering and information technology from the Technical University of Applied Sciences of Rosenheim, Germany, in 2016 and 2018, respectively. He is currently pursuing the Ph.D. degree in electrical and computer engineering at the Technical University of Munich, Germany.
In 2017, he was with the Mixed Signal ASICs Development Group of Rohde & Schwarz GmbH, Munich, Germany as a Master Student. Since 2018, he is with the Infineon Technologies AG, Munich, Germany, where he works on robust battery management systems. His research interests include automotive electronics, battery characterization and modeling, system simulation, power line communications and high frequency measurement techniques.
The complex impedance value over frequency for an electric vehicle’s battery cell is a good measure of the internal cell temperature, the state of charge (SoC), and the state of health. Moreover, comparing the battery stack impedance with the single cell impedances can reveal upcoming high contact resistances. Read on for the details of how to do it.