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Application of Electrochemical Impedance Spectroscopy on Different Battery Circuits

Sattler, Johannes and Bauder, Alexander and Schneider, Dirk and Wagner, Norbert and Friedrich, K. Andreas (2014) Application of Electrochemical Impedance Spectroscopy on Different Battery Circuits. 14th Ulm Electrochemical Talks (UETC), 23-25 Juni 2014, Ulm.

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Abstract

For the operation of a battery pack, the cell state estimation plays a central role. For that, enough information about the current charge condition (SoC, state of charge) and the health status (SoH, state of health) of the individual cells or cell strings must be available. One way to draw out conclusions about the state of charge and health provides the electrochemical impedance spectroscopy (EIS) [1]. The test cells are thereby stimulated with an alternating current signal, and the resulting voltage signal is detected. These results in cell impedances, which are addicted to the signal frequencies and the respective cell states. This poster shows an experimental platform which uses the EIS to detect asymmetries in SoC and/or SoH on circuited cells. For that, the behavior of the amplitudes and frequencies of the signals should be analyzed, because for the calculation of the precise impedance, these factors are crucial. Thereby the required alternating current and voltage signals are acquired and analyzed separately for each single cell. As cell type lithium iron-phosphate round cells of the size 18650 are used. The investigations are made on a series circuit (Fig.1) made up of three cells and on a parallel circuit made up of two strings, each having two cells in series. It shows that both a series and a parallel connection within the working range the experimental platform impedances of individual cells can be determined. For these cases, differences in state of charge and state of health can be highlighted and assigned to the respective cells.

Item URL in elib:https://elib.dlr.de/89937/
Document Type:Conference or Workshop Item (Poster)
Title:Application of Electrochemical Impedance Spectroscopy on Different Battery Circuits
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sattler, Johannesjohannes.sattler (at) dlr.deUNSPECIFIED
Bauder, Alexanderalexander.bauder (at) dlr.deUNSPECIFIED
Schneider, DirkDi.Schneider (at) dlr.deUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:25 June 2014
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Electrochemical Impedance Spectroscopy Batteries Diagnostic
Event Title:14th Ulm Electrochemical Talks (UETC)
Event Location:Ulm
Event Type:international Conference
Event Dates:23-25 Juni 2014
Organizer:WBZU, ZSW
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Wagner, Dr.rer.nat. Norbert
Deposited On:29 Jul 2014 09:46
Last Modified:31 Jul 2019 19:47

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