Overview of Battery Impedance Modeling Including Detailed State-of-the-Art Cylindrical 18650 Lithium-Ion Battery Cell Comparisons

Julian Estaller, Anton Kersten, Manuel Kuder, Torbjörn Thiringer, Richard Eckerle and Thomas Weyh
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Julian Estaller: Department of Electrical Engineering, Bundeswehr University Munich, 85579 Neubiberg, Germany
Anton Kersten: Department of Electrical Engineering, Bundeswehr University Munich, 85579 Neubiberg, Germany
Manuel Kuder: Department of Electrical Engineering, Bundeswehr University Munich, 85579 Neubiberg, Germany
Torbjörn Thiringer: Department of Electrical Engineering, Chalmers University of Technology, 41296 Goteborg, Sweden
Richard Eckerle: Department of Electrical Engineering, Bundeswehr University Munich, 85579 Neubiberg, Germany
Thomas Weyh: Department of Electrical Engineering, Bundeswehr University Munich, 85579 Neubiberg, Germany

Energies, 2022, vol. 15, issue 10, 1-21

Abstract: Electrical models of battery cells are used in simulations to represent batteries’ behavior in various fields of research and development involving battery cells and systems. Electrical equivalent circuit models, either linear or nonlinear, are commonly used for this purpose and are presented in this article. Various commercially available cylindrical, state-of-the-art lithium-ion battery cells, both protected and unprotected, are considered. Their impedance properties, according to four different equivalent circuit models, are measured using electrochemical impedance spectroscopies. Furthermore, the pricing, impedance, specific energy, and C-rate of the chosen battery cells are compared. For example, it is shown that the energy density of modern 18650 cells can vary from a typical value of 200 to about 260 Wh kg −1 , whereas the cell price can deviate by a factor of about 3 to 5. Therefore, as a result, this study presents a concise but comprehensive battery parameter library that should aid battery system designers or power electronic engineers in conducting battery simulations and in selecting appropriate battery cells based on application-specific requirements. In addition, the accuracies and computational efforts of the four equivalent circuit models are compared.

Keywords: battery; EIS; Li-ion; NMC; Warburg; 18650 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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