Overview of Battery Impedance Modeling Including Detailed State-of-the-Art Cylindrical 18650 Lithium-Ion Battery Cell Comparisons
Journal article, 2022

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.

18650

EIS

NMC

battery

Warburg

Li-ion

Author

Julian Estaller

Bundeswehr University Munich

Anton Kersten

Bundeswehr University Munich

Chalmers, Electrical Engineering, Electric Power Engineering

Manuel Kuder

Bundeswehr University Munich

Torbjörn Thiringer

Chalmers, Electrical Engineering, Electric Power Engineering

Richard Eckerle

Bundeswehr University Munich

Thomas Weyh

Bundeswehr University Munich

Energies

1996-1073 (ISSN) 19961073 (eISSN)

Vol. 15 10 3822

Subject Categories

Other Chemical Engineering

Biophysics

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.3390/en15103822

More information

Latest update

1/10/2023