基于分数阶理论的锂离子电池高频等效电路模型

doi:10.19595/j.cnki.1000-6753.tces.200562

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Abstract In energy systems with batteries, power electronics are usually used to control the energy flow between the battery and the load or excitation, which puts the battery in a high-frequency stress state. In this paper, according to the high-frequency real part growth phenomenon of electrochemical impedance spectroscopy (EIS) of lithium-ion battery, three equivalent circuit models FOM1, FOM2 and FOM3 with better fitting results were selected based on the fractional-order theory. The ripple current charging and discharging experiments were carried out at the frequencies of 1kHz, 2kHz, 4kHz and 10kHz, and the experimental data were used to fit the battery terminal voltages of different models. By comparing and analyzing the fitting results, FOM2 has the highest accuracy and FOM1 has the least amount of calculation. Different choices can be made according to the requirements of the use scenario. Besides, in the process of parameter identification, FOM2 was simplified to obtain FOM4. The time-domain fitting results of the two models are very close, but the EIS fitting results are quite different. After further analysis of the four models, it is found that when modeling for high frequency, the complex model established to improve the EIS fitting accuracy not only increases calculation but also may not improve the time-domain fitting accuracy.

Key words： Lithium-ion battery electrochemical impedance spectroscopy fractional order model high frequency

Received: 29 May 2020

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TM912

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	Wu Jian
	Yin Ze
	Li Hao
	Zhao Bin
	Ji Qiao
	Sun Bingxiang

Cite this article:

Wu Jian,Yin Ze,Li Hao等. High-Frequency Equivalent Circuit Model of Lithium-Ion Battery Based on Fractional Order Theory[J]. Transactions of China Electrotechnical Society, 2021, 36(18): 3902-3910.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200562 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I18/3902

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