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Comparison of Several Methods for Determining the Internal Resistance of Lithium Ion Cells

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Author(s): Hans-Georg Schweiger | Ossama Obeidi | Oliver Komesker | André Raschke | Michael Schiemann | Christian Zehner | Markus Gehnen | Michael Keller | Peter Birke

Journal: Sensors
ISSN 1424-8220

Volume: 10;
Issue: 6;
Start page: 5604;
Date: 2010;
Original page

Keywords: internal resistance | impedance | lithium-ion-cell | AC resistance | DC resistance

ABSTRACT
The internal resistance is the key parameter for determining power, energy efficiency and lost heat of a lithium ion cell. Precise knowledge of this value is vital for designing battery systems for automotive applications. Internal resistance of a cell was determined by current step methods, AC (alternating current) methods, electrochemical impedance spectroscopy and thermal loss methods. The outcomes of these measurements have been compared with each other. If charge or discharge of the cell is limited, current step methods provide the same results as energy loss methods.
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