Abstract：The direct current internal resistance (DCIR) is the sum of a battery's ionic and electronic resistances. The DCIR test indicates the battery's power characteristics and reflects the batteries' aging and uniformity characteristics. Thus, it is important for battery modeling and applications. This paper describes a DCIR test method based on the battery's constant current external characteristics. This method normalizes the battery's state of charge (SOC) changes for different constant current conditions. Then, the DCIR for different operating currents and SOC are obtained using constant current charge/discharge curves. This method is easier to implement than existing methods and has good accuracy.
何志超, 杨耕, 卢兰光, 吴海桑. 基于恒流外特性和SOC的电池直流内阻测试方法[J]. 清华大学学报（自然科学版）, 2015, 55(5): 532-537.
HE Zhichao, YANG Geng, LU Languang, Wu Haisang. Battery DC internal resistance test method based on the constant current external characteristics and SOC. Journal of Tsinghua University(Science and Technology), 2015, 55(5): 532-537.
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