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Appl. Sci. 2018, 8(6), 873;

Determination of SoH of Lead-Acid Batteries by Electrochemical Impedance Spectroscopy

Chair for Electrochemical Energy Conversion and Storage Systems, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Jägerstrasse 17-19, 52066 Aachen, Germany
BatterieIngenieure GmbH, Huettenstraße 5, 52068 Aachen, Germany
Institute for Power Generation and Storage Systems (PGS), E.ON ERC, RWTH Aachen University, Templergraben 55, 52062 Aachen, Germany
Jülich Aachen Research Alliance, JARA-Energy, Wilhelm-Johnen-Strasse, 52425 Jülich, Germany
Helmholtz Institute Münster (HI MS), IEK-12, Forschungszentrum Jülich, Jägerstrasse 17-19, 52066 Aachen, Germany
Author to whom correspondence should be addressed.
Received: 28 April 2018 / Revised: 18 May 2018 / Accepted: 23 May 2018 / Published: 25 May 2018
(This article belongs to the Special Issue Battery Management and State Estimation)
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The aging mechanisms of lead-acid batteries change the electrochemical characteristics. For example, sulfation influences the active surface area, and corrosion increases the resistance. Therefore, it is expected that the state of health (SoH) can be reflected through differentiable changes in the impedance of a lead-acid battery. However, for lead-acid batteries, no reliable SoH algorithm is available based on single impedance values or the spectrum. Additionally, the characteristic changes of the spectrum during aging are unknown. In this work, lead-acid test cells were aged under specific cycle regimes known as AK3.4, and periodic electrochemical impedance spectroscopy (EIS) measurements and capacity tests were conducted. It was examined that single impedance values increased linearly with capacity decay, but with varying slopes depending on the pre-history of the cell and measurement frequency of impedance. Thereby, possible reasons for ineffective SoH estimation were found. The spectra were fitted to an equivalent electrical circuit containing, besides other elements, an ohmic and a charge-transfer resistance of the negative electrode. The linear increase of the ohmic resistance and the charge-transfer resistance were characterized for the performed cyclic aging test. Results from chemical analysis confirmed the expected aging process and the correlation between capacity decay and impedance change. Furthermore, the positive influence of charging on the SoH could be detected via EIS. The results presented here show that SoH estimation using EIS can be a viable technique for lead-acid batteries. View Full-Text
Keywords: SoH; cyclic aging; AK3.4; sulfation; electro-chemical impedance spectroscopy; charge-transfer resistance; double-layer capacitance; lead-acid battery; diagnostic SoH; cyclic aging; AK3.4; sulfation; electro-chemical impedance spectroscopy; charge-transfer resistance; double-layer capacitance; lead-acid battery; diagnostic

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Kwiecien, M.; Badeda, J.; Huck, M.; Komut, K.; Duman, D.; Sauer, D.U. Determination of SoH of Lead-Acid Batteries by Electrochemical Impedance Spectroscopy. Appl. Sci. 2018, 8, 873.

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