Abstract：The discharge voltage curves contain all the state information of battery, and it is of great value to study the discharge voltage curves of the cells in the module for analyzing module consistency. A characterization method of influencing factors of battery module consistency was proposed based on discharge voltage curves. Firstly, taking the equivalent circuit model, capacity fading, thermal accumulation, coulomb efficiency and internal resistance growth into account, the battery model was built. Then, a characterization approach of influencing factors of battery module consistency on discharge voltage curves was put forward. In addition, combined the battery model with the approach mentioned above, a module model of four batteries in series was established in Simulink. The characteristics of the consistency influencing factors on the discharge voltage curve were studied with the increasing number of charging cycles. Finally, the method and the simulation results were verified from the perspective of module capacity loss. It is shown that the proposed method can characterize the influencing factors of battery module consistency on the discharge voltage curves effectively, which provides a reference for battery sorting.
王帅, 尹忠东, 郑重, 邹涵宇, 王银顺. 电池模组一致性影响因素在放电电压曲线簇上的表征[J]. 电工技术学报, 2020, 35(8): 1836-1848.
Wang Shuai, Yin Zhongdong, Zheng Zhong, Zou Hanyu, Wang Yinshun. Representation of Influence Factors for Battery Module Consistency on Discharge Voltage Curves. Transactions of China Electrotechnical Society, 2020, 35(8): 1836-1848.
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2020, Vol. 35 
