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Modeling and State Observer Design of HEV Li-ion Battery  

Kim, Ho-Gi (현대자동차(주) HEV개발실)
Heo, Sang-Jin (현대자동차(주) HEV개발실)
Kang, Gu-Bae (현대자동차(주) HEV개발실)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.13, no.5, 2008 , pp. 360-368 More about this Journal
Abstract
A lumped parameter model of Li-ion battery in hybrid electric vehicle(HEV) is constructed and system parameters are identified by using recursive least square estimation for different C-rates, SOCs and temperatures. The system characteristics of pole and zero in the frequency domain are analyzed with the parameters obtained from different conditions. The parameterized model of a Li-ion battery indicates highly dependent of temperatures. To estimate SOC and polarization voltage, a Luenberger state observer is utilized. The P- or PI-gains of observer based on a suitable natural frequency and damping ratio is adopted for the state estimation. Satisfactory estimation accuracy of output voltage and SOC is especially obtained by a PI-gain. The feasibility of the proposed estimation method is verified through experiment under the conditions of different C-rates, SOCs and temperatures.
Keywords
HEV(Hybrid Electric Vehicle); Li-ion Battery; SOC(State of Charge); C-rate(Charge Rate); Parameter Identification; Least Square Estimation; Luenberger Observer;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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