An Evaluation Method of Battery DC Resistance Consistency Caused by Temperature Variation

摘要

Direct current internal resistance (DCIR) is a key parameter to determine consistency of power characteristics of a battery pack. This consistency is influenced by batteries' internal temperature, which reflects consistency of the batteries' thermal characteristics inherently. In this paper, an evaluation method for thermal consistency of batteries' DCIR is proposed. Arrhenius coefficient of DCIR is selected as the index of thermal characteristics of each battery. Statistics analysis is conducted for quantitative consistency evaluation. Experimental results show that thermal consistency of batteries' DCIR can be accurately obtained with proposed method.