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A Method for Detecting the Existence of an Over-Discharged Cell in a Lithium-Ion Battery Pack via Measuring Total Harmonic Distortion

Department of Energy and Automation Technology, Electrical Energy Storage Technology, Technical University of Berlin, Einsteinufer 11, 10587 Berlin, Germany
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Academic Editor: Carlos Ziebert
Batteries 2022, 8(3), 26; https://doi.org/10.3390/batteries8030026
Received: 11 February 2022 / Revised: 14 March 2022 / Accepted: 17 March 2022 / Published: 21 March 2022
This paper deals with a method to detect the existence of an over-discharged cell in a lithium-ion battery (LIB) pack by measuring the total harmonic distortion (THD) rate in the voltage response. Over-discharge of the LIB cell reduces the available capacity by irreversible chemical reactions, resulting in serious safety risks such as explosions. Even if only one over-discharged cell exists in the battery pack, it accelerates the decomposition of other cells. In general, the measurement of each cell voltage in a battery pack is required to detect one over-discharged cell. This is because if only the voltage of the battery pack is measured, it cannot be distinguished whether the voltage of each cell is uniformly low or one specific weak cell is over-discharged. The proposed method measures the frequency response through the voltage at only two terminals of the battery pack to detect the presence of one over-discharged cell. When the battery cell is discharged beyond a certain level, the system nonlinearity of the battery pack increases, and it can be detected from the increased THD rate of the battery pack. The proposed method is verified by simulation and measurement. View Full-Text
Keywords: lithium-ion battery; over-discharge; total harmonic distortion lithium-ion battery; over-discharge; total harmonic distortion
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MDPI and ACS Style

Kim, J.; Kowal, J. A Method for Detecting the Existence of an Over-Discharged Cell in a Lithium-Ion Battery Pack via Measuring Total Harmonic Distortion. Batteries 2022, 8, 26. https://doi.org/10.3390/batteries8030026

AMA Style

Kim J, Kowal J. A Method for Detecting the Existence of an Over-Discharged Cell in a Lithium-Ion Battery Pack via Measuring Total Harmonic Distortion. Batteries. 2022; 8(3):26. https://doi.org/10.3390/batteries8030026

Chicago/Turabian Style

Kim, Jonghyeon, and Julia Kowal. 2022. "A Method for Detecting the Existence of an Over-Discharged Cell in a Lithium-Ion Battery Pack via Measuring Total Harmonic Distortion" Batteries 8, no. 3: 26. https://doi.org/10.3390/batteries8030026

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