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.%为减少工业常用荷电状态(SOC)估计方法——安时法的累积误差,提出一种实时校正的锂离子电池SOC估计方法.在0~60℃,放电倍率1 C、2 C、3 C和0.33 C下,进行锂离子电池放电实验,测量了电压、电流、温度,建立了锂离子电池放电数据库.从该库获取上述放电温度、放电倍率范围,SOC值为20%、80%时的开路电压,以此两点引入一条关于电压与SOC的直线.以该直线上某点电压所对应SOC作为修正项,并引入修正因子 α,来校正安时法所得剩余电量SOC估计值.与实验值对比,该SOC估计结果的误差小于4%,符合工业需求.
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