Optimal Direct Parameter Extraction of a Lithium-Ion Equivalent Circuit Cell Model for Electric Vehicle Application

Philip Lewoc, Philip Korta, Lakshmi Varaha Iyer () and Narayan C. Kar
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Philip Lewoc: Centre of Hybrid Automotive Research and Green Energy, Faculty of Engineering, University of Windsor, Windsor, ON N9B 3P4, Canada
Philip Korta: Centre of Hybrid Automotive Research and Green Energy, Faculty of Engineering, University of Windsor, Windsor, ON N9B 3P4, Canada
Lakshmi Varaha Iyer: Centre of Hybrid Automotive Research and Green Energy, Faculty of Engineering, University of Windsor, Windsor, ON N9B 3P4, Canada
Narayan C. Kar: Centre of Hybrid Automotive Research and Green Energy, Faculty of Engineering, University of Windsor, Windsor, ON N9B 3P4, Canada

Energies, 2025, vol. 18, issue 21, 1-17

Abstract: The lithium-ion cell model is the heart of the battery management system—a more accurate model ensures operational safety, extends pack lifetime, and provides better tracking of battery charge and health. Catalyzed by the automotive industry’s shift towards electrification, optimal parameterization of the lithium-ion cell is of crucial importance. Two dominant methods of direct parameterization have emerged in the literature as the standard for parameter extraction of a lithium-ion equivalent circuit cell model. A direct comparison of their performance and suggestion as to the optimal method of cell parameterization has not yet been proposed; Thus, this paper aims to extract the optimal parameter set regarding the two dominant direct methods with an electrochemically based logic, compare the accuracy of cell parametrization over two transient load profiles, and ultimately suggest which method is preferable for electric vehicle applications. Additionally, this work will be conducted over multiple C-rates to quantify the robustness of each direct method of parameterization over a transient load profile.

Keywords: battery-powered vehicles; equivalent electrical circuits; lithium-ion batteries; parameter identification (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: 2025
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