Impedance-based and circuit-parameter-based battery models for HEV power systems |
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Authors: | J H Jang J Y Yoo |
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Institution: | (1) Department of Electrical Engineering, Korea University, Seoul, 136-713, Korea |
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Abstract: | The relationship between voltage and current inside a battery, or the impedance, plays an important role in the simulation
and design of hybrid electric vehicle (HEV) power systems. This paper proposes a new approach employing the Bode plot for
evaluation of equivalent circuit parameters for a lithium polymer battery (LiPB) for HEV application. The main concept of
the proposed circuit-parameter-based model approach is the application of a transfer function used to process the frequency
response of the battery for calculation of accurate circuit parameters. Additionally, the Bode plot is also applied to derive
the impedance-based model directly from frequency response measurements for short time simulations and practical use in the
HEV. Two methods for battery modeling are proposed and verified experimentally with the voltage-current profile of a conventional
HEV using the battery measured in this paper. The results show that the proposed circuit-parameter-based technique provides
a satisfactory battery equivalent circuit model. |
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Keywords: | HEV LiPB Battery modeling Electrical equivalent circuit Impedance Circuit parameter |
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