SOC distribution-based modeling for lithium-ion battery for electric vehicles using numerical optimization |
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Authors: | HU Xiao-song SUN Feng-chun and Zhou Yuan |
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Affiliation: | National Engineering Laboratory for Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China |
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Abstract: | In order to simulate electrical characteristics of a lithium-ion battery used in electric vehicles in a good manner,a three-layer battery model is established.The charge of the lithium-ion battery is assumed to distribute among the three layers and their interaction is used to depict hysteresis and relaxation effect observed in the lithium-ion battery.The model parameters are calibrated and optimized through a numerically nonlinear least squares algorithm in Simulink Parameter Estimation Toolbox for an experimental data set sampled in a hybrid pulse test of the battery.Evaluation results showed that the established model is able to provide an acceptable accuracy in estimating the State of Charge of the lithium-ion battery in an open-loop fashion for a sufficiently long time and to describe the battery voltage behavior more accurately than a commonly used battery model.The battery modeling accuracy can thereby satisfy the requirement for practical electric vehicle applications. |
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Keywords: | battery modeling SOC distribution numerical optimization lithium-ion battery electric vehicle |
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