International Journal of Energy Research

Volume 44, Issue 11 pp. 8372-8387

RESEARCH ARTICLE

An equivalent circuit model of a deformed Li-ion battery with parameter identification

Wenquan Shuai,

Wenquan Shuai

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, China

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Enying Li,

Enying Li

College of Mechanical & Electrical Engineering, Central South University of Forestry and Technology, Changsha, China

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Hu Wang,

Corresponding Author

Hu Wang

[email protected]

orcid.org/0000-0002-5974-4499

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, China

Correspondence

Hu Wang, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, China.

Email: [email protected]

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Wenquan Shuai,

Wenquan Shuai

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, China

Search for more papers by this author

Enying Li,

Enying Li

College of Mechanical & Electrical Engineering, Central South University of Forestry and Technology, Changsha, China

Search for more papers by this author

Hu Wang,

Corresponding Author

Hu Wang

[email protected]

orcid.org/0000-0002-5974-4499

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, China

Correspondence

Hu Wang, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, China.

Email: [email protected]

Search for more papers by this author

First published: 30 May 2020

https://doi.org/10.1002/er.5500

Citations: 20

Funding information: Key Projects of the Research Foundation of Education Bureau of Hunan Province, Grant/Award Number: 17A224; National Natural Science Foundation of China, Grant/Award Numbers: 11972155, 11572120, 51621004

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Summary

A new equivalent circuit model (ECM) of a Li-ion battery is developed in this study. The developed model is utilized to obtain the dynamic electrical response of the battery when it is deformed under external force. Compared with other models, this model is developed based on a modified Thevenin model, and the parameters of the developed model are relevant to state of charge, the battery surface temperature, and the deformation. In this study, to obtain the real electrical response of the battery when it deformed under external force, batteries that are compressed by different deformations from 0 to 5 mm are studied with pulse discharging tests. Then, the parameters of the circuit elements are identified by a differential evolution algorithm based on the data obtained from these tests. Moreover, the data from the pulse discharging tests of batteries compressed by 3.5, 4.25, and 4.5 mm and the data from the pulse charging tests of batteries compressed by 0 and 1 mm are used to verify the parameters. The results illustrate that the battery capacity should drop significantly when the battery is severely deformed, but the battery still can be charged and discharged. Most importantly, the discharging curves of these tested deformed batteries are similar to those of undeformed ones. Moreover, the developed new ECM can predict the dynamic electrical response of a deformed battery accurately.

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