To estimate the pulse power capability of high power lithium ion battery, an electrochemical model for lithium ion battery is developed firstly based on porous electrode and concentrated solution theory. With the model, the change in battery terminal voltage can be predicted according to the charge/discharge current and operation temperature of battery, and hence the maximum pulse discharge/charge power permitted by lithium ion battery pack at present state can be estimated. Then, for verifying the effectiveness of the model, the dynamic response process of terminal voltage in a 3. 6V/8A · h lithium ion battery during 10s pulse charge/discharge with various current rates, and the acceptable 10s maximum pulse discharge/charge power of 144V/8A · h lithium ion battery pack under different SOCs and temperatures are measured on Arbin test bench. The results of tests show that when the pulse charge/discharge time exceeds 1s, the relative errors of the predicted terminal voltages are less than ±1% and the relative errors of the estimated maximum discharge/charge power of battery pack are less than ±3%. Finally, the effects of negative electrode porosity on the pulse power capability of battery pack are analyzed with the electrochemical model.%为估计功率型锂离子电池组的脉冲功率能力,首先基于多孔电极和浓溶液理论建立了锂离子电池的电化学模型,以便根据电池充放电电流和运行温度预测电池端电压的变化,并估计锂离子电池组当前状态下可接受的最大脉冲充放电功率.然后为验证模型的有效性,在Arbin台架上分别测量了3.6V/8Au0007h锂离子电池在不同等级电流下进行10s脉冲充放电时电池端电压的动态响应过程,和144V/8A·h锂离子电池组在不同SOC和温度下可接受的10s最大脉冲充放电功率.试验结果表明,锂离子电池脉冲充放电时间大于1s后,电池端电压预测值的相对误差不超过±1％；电池组10s最大脉冲充放电功率估计值的相对误差不超过±3％.最后采用电化学模型分析了负极孔隙率对电池脉冲功率能力的影响.
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