Journal
JOURNAL OF POWER SOURCES
Volume 233, Issue -, Pages 277-284Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.01.094
Keywords
Lithium ion battery; Electric vehicle; State of charge; Impedance model; Fractional Kalman filter; Fractional order calculus (FOC)
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This paper deals with the problem of estimating the state of charge (SOC) of lithium-ion batteries. Based on the analysis of the impedance spectra obtained by electrochemical impedance spectroscopy (EIS), a simplified battery impedance model is derived with the constant phase element (CPE). To interpret the impedance model, a fractional order calculus (FOC) method is introduced to model the CPE in the impedance model. A new identification method is proposed to identify the impedance model, considering both accuracy and simplicity. The fractional Kalman filter is introduced to estimate the SOC of the lithium-ion battery based on the impedance model. Finally, a battery test bench is established, and the proposed method is verified by a scaled down system on the urban dynamometer driving schedule (UDDS) drive cycle test. (C) 2013 Elsevier B.V. All rights reserved.
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