中文摘要：

电池内阻特性影响电池的输出功率,是电池状态估计与管理需要重点关注的参数之一。对某款车用三元锂离子动力电池的内阻特性进行了系统的分析,分别研究了SOC、温度和放电倍率对放电内阻的影响,并基于电池内部电化学工作过程,提出了描述电池放电内阻随放电倍率变化的公式。

英文摘要：

The battery impedance is one of the critical parameters for state estimation and management, especially for state of power （SOP）. The impedance characteristics of lithium ion battery with NCM cathode were studied. The influences of SOC, temperature and rate on the impedance were investigated. Moreover, the formula between rate and battery impedance was established based on electrochemical characteristics of lithium ion battery.