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Electrical, Control and Communication Engineering

The Journal of Riga Technical University

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Evaluation of Equivalent Circuit Diagrams and Transfer Functions for Modeling of Lithium-Ion Batteries

Ahmad Rahmoun / Helmuth Biechl / Argo Rosin
Published Online: 2013-05-11 | DOI: https://doi.org/10.2478/ecce-2013-0005


The rapid developments in the field of electrochemistry, enabled lithium-ion batteries to achieve a very good position among all the other types of energy storage devices. Therefore they became an essential component in most of the modern portable and stationary energy storage applications, where the specific energy and the life time play an important role. In order to analyze and optimize lithium-ion batteries an accurate battery model for the dynamic behavior is required. At the beginning of this paper four different categories of electrical models for li-ion cells are presented. In the next step a comparison between equivalent circuit diagrams and fractional rational functions with the complex variable s is shown for lithium-ion battery modeling. It is described how to identify the parameters of the models in the time domain and also in frequency domain. The validation of the different models is made for high and low dynamic current profiles. In the first step the dependency of all model parameters on the temperature and on the battery age is neglected. These effects will be taken into account in the continuation of this work

Keywords : Batteries; equivalent circuits; mathematical model; transfer functions

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About the article

Ahmad Rahmoun

A. Rahmoun M.Eng. received Dipl.Eng. in Electronic Systems from Higher Institute for Applied Sciences and Technology (HIAST), Damascus, Syria, in 2006, and finished his Master study of Electrical Engineering at the University of Applied Sciences Kempten, Germany, in 2012. His employment experience included Digital Image and Signal Processing Lab (HIAST), and he is currently a research engineer at IABF at the University of Applied Sciences Kempten (Kempten, Germany), and a PhD student at Tallinn University of Technology (Estonia). Postal address: University of Applied Sciences Kempten, Institute for Applied Battery Research (IABF), Bahnhofstraße 61, 87435 Kempten (Allgäu), Germany.

Helmuth Biechl

Helmuth Biechl received his Dipl.-Ing. Univ. and M.Sc. degree from the Technical University of Munich (TUM) in 1985 and his Dr.-Ing. and PhD degree in 1989 also from the Technical University of Munich. From 1989 till 1994 he was a developing and planning engineer and a group leader at the companies Siemens and E.ON. Since 1994 he is a full professor at the University of Applied Sciences Kempten in Germany and working on the field of electrical power systems, mainly electrical machines, drives, power transportation and distribution systems and big batteries. Since 2011 he is the Director of the Institute for Electrical Power Systems. Since 2005 is a Titular Professor at the Universidad Pontificia Bolivariana in Colombia where he got a doctor honoris causa degree in 2012. His main research interests are modelling and simulation of electrical power systems. He has published more than 30 international scientific papers and about 200 articles in technical magazines. Postal address: University of Applied Sciences Kempten, Institute for Applied Battery Research (IABF), Bahnhofstraße 61, 87435 Kempten (Allgäu), Germany.

Argo Rosin

Argo Rosin received the Dipl. Eng., M.Sc. and Dr.Sc.techn. degrees in electrical engineering from Tallinn University of Technology, Tallinn, Estonia, in 1996, 1998 and 2005, respectively. He is presently a Senior Researcher in the Department of Electrical Engineering, Tallinn University of Technology. He has published more than 60 papers on energy management, control and diagnostic systems development and is the holder of a Patent in this application field. His research interests include modelling and simulation of power management and industrial control systems. He is member of Estonian Association of Engineers, Estonian Association of Transport and Roads. Postal address: Faculty of Power Engineering, Tallinn University of Technology, Ehitajate str. 5, 19086 Tallinn, Estonia.

Published Online: 2013-05-11

Published in Print: 2013-04-01

Citation Information: Electrical, Control and Communication Engineering, Volume 2, Issue 1, Pages 34–39, ISSN (Online) 2255-9159, ISSN (Print) 2255-9140, DOI: https://doi.org/10.2478/ecce-2013-0005.

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