Journal
JOURNAL OF POWER SOURCES
Volume 257, Issue -, Pages 1-11Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.01.097
Keywords
Lithium ion batteries; Electro-thermal model; Parameterization; Core temperature; State of charge
Funding
- U.S. Army Tank Automotive Research, Development, and Engineering Center (TARDEC)
- Automotive Research Center (ARC), a U.S. Army center of excellence in modeling and simulation of ground vehicles
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Combining several existing lumped-parameter models, this paper presents an electro-thermal model for cylindrical batteries. The model consists of two sub-models, an equivalent-circuit electrical model and a two-state thermal model which are coupled through heat generation and temperature dependence of the electrical parameters. The computationally efficient 5-state model captures the state of charge (SOC), terminal voltage, surface temperature and the often neglected core temperature of a battery for wide range of operating conditions. The proposed parameterization scheme allows separate identification of the electric and thermal sub-models, greatly reducing the complexity of the parameterization process. The methodology is applied to a LiFePO4/graphite battery. Comparison with the electrochemical impedance spectroscopy data clarifies the frequency range of the model fidelity. The model is further validated with two drive-cycle tests, covering SOC range 25%-100%, temperature 5 degrees C-38 degrees C, and maximum C-rate of 22C. (C) 2014 Elsevier B.V. All rights reserved.
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