车用锂离子动力电池均衡技术综述

Overview of Automotive Lithium-ion Batteries Equalization Technology

得益于较高的能量密度、较长的循环寿命等优点,锂离子电池被广泛应用于电动汽车中作为动力电池。由于库仑效率高,锂离子电池无法实现"自我均衡"。如果没有适当的管理,锂离子电池失衡将不会随着时间的推移而自行矫正。因此,需要对电池电芯单体实施均衡以解决单体性能差异造成的不均衡。文章首先介绍了锂离子电池的荷电状态(SOC)不均衡的原因和分类,然后系统地介绍了当前锂离子电池SOC均衡技术的研究现状和主要均衡策略,为锂离子电池均衡技术的研究提供参考。

Because of the high energy density and long cycle life, lithium-ion batteries are widely used in electric vehicles as power batteries. Due to the high columbic efficiency, lithium-ion batteries cannot achieve "self-equalization". The cell imbalance of the lithium-ion battery pack will not be corrected by itself without a proper management strategy. Therefore, it is necessary to implement a balancing strategy for the battery cells to solve the imbalance caused by the difference in the performance of the cells. Firstly, the causes and classification of lithium-ion batteries SOC imbalance are introduced. Then, the current research status and the mainstream strategies for the lithium-ion batteries SOC equalization technology are systematically presented. The reference for the research of lithium-ion batteries equalization technology is provided in this paper.