A new method to estimate the state of charge of lithium-ion batteries based on the battery impedance model

作者：Xu Jun; Mi Chunting Chris^*; Cao Binggang; Cao Junyi

来源：Journal of Power Sources, 2013, 233: 277-284.

DOI：10.1016/j.jpowsour.2013.01.094

• Lithium ion battery
• Electric vehicle
• State of charge
• Impedance model
• Fractional Kalman filter
• Fractional order calculus (FOC)

This paper deals with the problem of estimating the state of charge (SOC) of lithium-ion batteries. Based on the analysis of the impedance spectra obtained by electrochemical impedance spectroscopy (EIS), a simplified battery impedance model is derived with the constant phase element (CPE). To interpret the impedance model, a fractional order calculus (FOC) method is introduced to model the CPE in the impedance model. A new identification method is proposed to identify the impedance model, considering both accuracy and simplicity. The fractional Kalman filter is introduced to estimate the SOC of the lithium-ion battery based on the impedance model. Finally, a battery test bench is established, and the proposed method is verified by a scaled down system on the urban dynamometer driving schedule (UDDS) drive cycle test.

• 出版日期2013-7-1
• 单位西安交通大学