一种均衡阈值可调的双模式电池均衡电路  

Two-mode cell balancing circuit with adjustable balancing threshold

作　　者：徐鹏[1] 康龙云[1] 万蕾 谢缔 XU Peng;KANG Longyun;WAN Lei;XIE Di(Electric Power College,South China University of Technology,Guangzhou 510640,China;Guangdong Hynn Technology Co.,Ltd,Dongguan 518109,China)

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]广东恒翼能科技有限公司,广东东莞518109

出　　处：《电机与控制学报》2023年第10期96-107,共12页Electric Machines and Control

基　　金：广东省重点领域研发计划项目(2019B090911001)。

摘　　要：均衡电路对于提高串联电池组内部一致性、容量利用率和寿命具有重要意义。针对现有单模式均衡电路的局限性,提出了一种基于准谐振开关电容和互补三谐振LC变换器的双模式电池均衡电路,可以根据电压分布情况在任意电池至任意电池间传输模式和直接电池至电池间传输模式之间切换,且两种模式均实现了零电流开关,减少了电路损耗。为了获得最优的均衡速度,提出一种具有双阈值的均衡电路控制策略,通过对均衡阈值的调整可以获得最佳的均衡速度。分析了两种均衡模式的运行状态、均衡功率和均衡效率,并搭建了4节电池的实验样机,在不同均衡阈值下进行了均衡实验,实验结果说明均衡阈值的调整使得双模式均衡电路获得了最佳的均衡速度,实验验证了该双模式电池均衡电路的有效性。Cell balancing circuit plays an important role in improving internal consistency,capacity utilization and life span of series battery pack.In view of the limitations of the existing single-mode balancing circuit,this paper proposes a two-mode cell balancing circuit based on quasi-resonant switching capacitor and complementary three-resonant-state LC converter.The circuit can switch between any cell to any cell(AC2AC)mode and direct cell to cell(DC2C)mode according to the voltage distribution,and the two modes can both realize zero-current switching,and circuit loss reduction.To obtain the optimal balancing speed,a balancing circuit control strategy with double thresholds is proposed.This paper analyzed the operating states,balancing power,and balancing efficiency of two balancing modes,and the experimental prototype of four cells was built to conduct balancing experiments under different balancing thresholds.The experimental results show that the adjustment of the balancing threshold allows the two-mode balancing circuit to obtain the best balancing speed and the experiment proves the effectiveness of the two-mode cell balancing circuit.

关 键 词：电池均衡电路 双模式 零电流开关 均衡阈值 控制策略 均衡速度 

分 类 号：TM91[电气工程—电力电子与电力传动]