基于隔离型半桥变换器的退役电池组均衡方法  

Retired battery equalization method based on isolated half-bridge converter

作　　者：詹敏 柯锦洋 吴铁洲[1] Zhan Min;Ke Jinyang;Wu Tiezhou(Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System,Hubei Universityof Technology,Wuhan 430068,China)

机构地区：[1]湖北工业大学太阳能高效利用及储能运行控制湖北省重点实验室,武汉430068

出　　处：《电子测量技术》2022年第17期7-13,共7页Electronic Measurement Technology

基　　金：国家自然科学基金(51677058)项目资助。

摘　　要：在梯次电池储能应用中,梯次电池间存在的较大不一致性使得电池组在充放电过程中更容易出现过充和过放现象,限制了电池组整体的可用容量甚至造成安全隐患。针对该问题,本文提出了一种基于隔离型双半桥DC-DC变换器的有源均衡电路。该均衡电路由N+5个开关(N为电池数目)构成的开关阵列和隔离型双半桥DC-DC变换器构成,保证了电路的灵活性。在主电路工作原理分析的基础上,进一步提出了一种基于SOC的分状态均衡控制策略,在电池组充电、放电和静置三种不同状态下,采用对应的均衡策略实现电池组能量平衡。最后对5节串联锂离子电池进行了均衡实验,实验结果表明相比不使用均衡器的电池组,该方法在静置、充电、放电状态下分别提升了12%,9.9%,17.5%的可用容量,证明了该方法的可行性及有效性。In the energy storage application of retired batteries,the large inconsistency between the retired batteries makes the battery pack more prone to over-charge and over-discharge during the charging and discharging process,which reduces the overall available capacity of the battery pack and even causes safety issues.In order to solve the above problems,an active equalization circuit based on an isolated dual half-bridge DC-DC converter is proposed in this paper.The equalizer circuit consists of a switch array of N+5 switches(N is the number of cells)and an isolated dual half-bridge DC-DC converter,which ensures the flexibility of the circuit.Based on the analysis of the working principle of the main circuit,a sub-state equalization control strategy based on SOC is proposed to achieve balancing of the battery pack by using the corresponding equalization strategy under three different states of battery pack:charging,discharging and resting.Finally,an equalization experiment was carried out on 5 series lithium-ion batteries.The experimental results show that the available capacity of this method is increased by 12%,9.9%,and 17.5%in the resting,charging,and discharging states,respectively,compared with the battery pack without the equalizer,which proves the feasibility and effectiveness of this method.

关 键 词：梯次利用电池 有源均衡 开关阵列 隔离型双半桥DC-DC变换器 分状态均衡策略 

分 类 号：TM912[电气工程—电力电子与电力传动]