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Article

A Method for Monitoring State-of-Charge of Lithium-Ion Cells Using Multi-Sine Signal Excitation

Department of Energy and Automation Technology, Electrical Energy Storage Technology, Technical University of Berlin, Einsteinufer 11, 10587 Berlin, Germany
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Author to whom correspondence should be addressed.
Academic Editors: Duygu Kaus and Kai Peter Birke
Batteries 2021, 7(4), 76; https://doi.org/10.3390/batteries7040076
Received: 30 July 2021 / Revised: 15 October 2021 / Accepted: 3 November 2021 / Published: 9 November 2021
(This article belongs to the Special Issue Battery Systems and Energy Storage beyond 2020)
In this paper, a method for monitoring SoC of a lithium-ion battery cell through continuous impedance measurement during cell operation is introduced. A multi-sine signal is applied to the cell operating current, and the cell SoH and SoC can be simultaneously monitored via impedance at each frequency. Unlike existing studies in which cell impedance measurement is performed ex situ through EIS equipment, cell state estimation is performed in situ. The measured impedance takes into account cell temperature and cell SoH, enabling accurate SoC estimation. The measurement system configured for the experiment and considerations for the selection of measurement parameters are described, and the accuracy of cell SoC estimation is presented. View Full-Text
Keywords: lithium-ion battery; battery management system; state monitoring; state-of-charge lithium-ion battery; battery management system; state monitoring; state-of-charge
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MDPI and ACS Style

Kim, J.; Kowal, J. A Method for Monitoring State-of-Charge of Lithium-Ion Cells Using Multi-Sine Signal Excitation. Batteries 2021, 7, 76. https://doi.org/10.3390/batteries7040076

AMA Style

Kim J, Kowal J. A Method for Monitoring State-of-Charge of Lithium-Ion Cells Using Multi-Sine Signal Excitation. Batteries. 2021; 7(4):76. https://doi.org/10.3390/batteries7040076

Chicago/Turabian Style

Kim, Jonghyeon, and Julia Kowal. 2021. "A Method for Monitoring State-of-Charge of Lithium-Ion Cells Using Multi-Sine Signal Excitation" Batteries 7, no. 4: 76. https://doi.org/10.3390/batteries7040076

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