车用动力锂离子电池单体不一致性问题研究综述

A Research Review on the Cell Inconsistency of Li-ion Traction Batteries in Electric Vehicles

分析了动力电池单体不一致的内外部成因,从容量、内阻、自放电率、荷电状态和端电压等方面总结了电池单体不一致的表现规律。介绍了基于外部表现的单体电池一致性的评价方法,并分析了缓解电池不一致问题的技术手段,包括电池分选、单体均衡、热管理和考虑不一致影响的电池建模与状态估计等。

In this paper, the intrinsic and external causes of cell inconsistency of traction battery are ana- lyzed, and the changing rules of cell inconsistency symptoms are summed up from the aspects of capacity, internal resistance, self-discharge rate, SOC and terminal voltage. The evaluation methods of the cell inconsistency based on external features are presented, and the technical means for relieving the problem of cell inconsistency are analyzed, including cell screening, cell balancing, thermal management as well as the modeling and state estimation of battery with consideration of cell inconsistency.