基于SOC的锂动力电池多层双向自均衡方法

发布时间：2019-02-11 17:28

【摘要】：电池均衡是优化动力电池性能,提高使用寿命,增强动态工作过程安全性的一项关键技术.针对锂动力电池单体数量多,测量与控制数据量庞大等问题,本文将锂动力电池分为区域模块和全局模块两层,进而提出一种融合区域均衡与全局均衡的多层次协调均衡方法.通过开关电容区域均衡电路与反激式变压器全局均衡电路控制充放电过程的开关通断,实现双向均衡目标;在此基础上,考虑不同电池荷电状态(State of Charge,SOC)分布情况下锂电池的受电能力差异,以多模式充电策略为均衡前提条件,使用SOC关键参数作为均衡判据,实现系统充电与非充电过程的主动双向自均衡.实验结果表明,所提出的双向自均衡方法能实现高精度的均衡目标,且能耗较低.
[Abstract]:Battery equalization is a key technology to optimize the performance of power battery, improve service life and enhance the safety of dynamic working process. Aiming at the problems of the large number of lithium power battery cells and the large amount of measurement and control data, this paper divides the lithium power battery into two layers: regional module and global module, and then proposes a multi-level coordinated equalization method combining regional and global equalization. Through switching capacitor region equalization circuit and flyback transformer global equalization circuit to control the on-off of charge and discharge process to achieve the bi-directional equalization goal; On this basis, considering the difference of the lithium-ion battery's capacity under different (State of Charge,SOC distribution, the multi-mode charging strategy is used as the equalization precondition, and the key parameters of SOC are used as the equalization criterion. The active bidirectional self-equalization of charging and non-charging process is realized. The experimental results show that the proposed bi-directional self-equalization method can achieve high precision equalization target and lower energy consumption.
【作者单位】：中南大学信息科学与工程学院;先进控制与智能自动化湖南省工程实验室;
【基金】：国家自然科学基金(No.61202340) 国家国际科技合作专项(No.2013DFB10070) 中国博士后基金面上项目(No.2013M542135) 湖南省产学研结合创新平台建设(No.2012GK4106)
【分类号】：TM912

【共引文献】