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《Journal of Automotive Safety and Energy》 2017-02
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On-line correction method for SOC of Li-ion battery based on current integration method

LIU Xiongfei;CUI Bin;LIU Junjie;LIN Yong;School of Physics and Electronics, Central South University;Hunan Gold Cup Energy Development Co., Ltd;  
An on-line correction method was proposed for Li-ion battery to reduce the cumulative error from state of charge(SOC) estimation method witch is industrial commonly used. Li-ion battery discharging experiments were carried out with measuring the voltages, currents and temperatures at 0~60 ℃ with discharge rate of 1 C, 2 C, 3 C and 0.33 C to build a Li-ion battery discharge database. Open-circuit voltages were obtained using this database under SOC of 20% and 80% at the same arrange of discharge temperatures and discharge rates mentioned above to determine a straight line of SOC and open-circuit voltage. The SOC corresponding a voltage point on the straight line and a correction factor α were used to correct the SOC obtained by the current integration method. The results show that the error between estimation SOC and actual SOC is less than 4%, which meets industrial demand.
【Fund】: 国家自然科学基金资助项目(61490702)
【CateGory Index】: TM912
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