Browsing by Author "Wang, Binbin"

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    An improved Thevenin model of lithium-ion battery with high accuracy for electric vehicles
    (Elsevier, 2019-08-07) Ding, Xiaofeng; Zhang, Donghuai; Cheng, Jiawei; Wang, Binbin; Luk, Patrick Chi-Kwong
    This paper proposes an improved Thevenin model of the Lithium-ion battery taking into account temperature influence on the calculation accuracy of the open circuit voltage of a battery. The calculation accuracy of the terminal voltage of a battery is improved without increasing the order of the model. Firstly, the model was proposed based on Thevenin model and the relationship between the open-circuit voltage and the state of charge. Then, based on the experimental results of the open-circuit voltage test and hybrid power pulse characteristic test, the parameters of the battery model were identified by polynomial fitting and genetic algorithm, respectively. Furthermore, the temperature effects were considered in both the open-circuit voltage and hybrid power pulse characteristic tests. Finally, the proposed model was tested and verified by experiments under the Dynamic Stress Test condition and the Urban Dynamometer Driving Schedule at different temperatures. The accuracy of the proposed model is high and the parameter identification error is less than 1%.
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    A novel active equalization topology for series-connected lithium-ion battery packs
    (IEEE, 2020-08-11) Ding, Xiaofeng; Zhang, Donghuai; Cheng, Jiawei; Wang, Binbin; Chai, Yameng; Zhao, Zhihui; Xiong, Rui; Luk, Patrick Chi-Kwong
    A novel nondissipative two-stage equalization circuit topology based on the traditional buck-boost circuit is proposed to achieve balancing of series-connected lithium-ion battery packs with higher efficiency and less cost, considering the background on international energy issues and the development trend of battery balancing. The proposed topology achieves high efficient balancing of lithium-ion battery packs without adding additional devices. Detailed illustration of the presented topology, the operation principles and control approaches are described with visualized figures in this article. Then, under the condition of accurate modeling of the lithium-ion battery, relying on the experimental data, the simulation block is built based on MATLAB. Furthermore, the prototype of the proposed topology was designed and manufactured. The effectiveness of the proposed topology is verified by both the simulation and experiment.