| 汤祥宇,陆华才.动力电池分层均衡控制研究[J].电子测量与仪器学报,2023,37(12):234-241 |
| 动力电池分层均衡控制研究 |
| Research on hierarchical equalization control of power battery |
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| DOI： |
| 中文关键词: 锂电池 Buck 变换器 Buck-Boost 变换器 分层均衡 |
| 英文关键词:lithium-ion battery Buck converter Buck-Boost converter hierarchical equalization |
| 基金项目:检测技术与节能装置安徽省重点实验室开放基金项目(JCKJ2022A04)资助 |
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| 中文摘要: |
| 提出一种分层均衡电路,用于解决锂离子电池在串联成组时,由于单体电池的不一致性,产生的部分电池过充和过放的
问题。 分层均衡电路以单体电池荷电状态(state of charge, SOC)值作为均衡变量,将电池组分为 3 个小组,组内进行基于 Buck
变换器的均衡;在各小组之间搭建 Buck-Boost 电路,进行组间均衡。 组内均衡与组间均衡相结合,提高了均衡效率。 在
MATLAB/ Simulink 平台搭建的仿真结果表明,相对于基于 Buck 变换器和基于 Buck-Boost 变换器的均衡电路,分层均衡电路在
静置、充电和放电 3 种工况下,均衡时间相比基于 Buck 的均衡电路分别降低了 21%、18%和 30%,相比基于 Buck-Boost 的均衡
电路分别降低了 17%、29%和 15%。 电池组的均衡实验表明,该电路提高了单体电池一致性,能将电池组 SOC 值极差控制在
0. 1%以内,解决部分电池过充和过放问题,同时提高了均衡效率。 |
| 英文摘要: |
| A hierarchical equalization circuit is proposed to solve the problem of partial over charge and over discharge of lithium-ion
battery, due to the inconsistency of single battery in series group. The hierarchical equalization circuit takes the state of charge (SOC)
value of single battery as equalization variable, divides battery pack into three groups, and carries out equalization based on Buck
converter within the group; Buck-Boost circuit was built between each group to realize bidirectional flow of electricity between groups and
balance between groups. The combination of intra-group balancing and inter-group balancing improves the balancing efficiency. The
simulation results built on MATLAB/ Simulink platform show that compared with the equalization circuit based on Buck converter and
Buck-Boost converter, the hierarchical equalization circuit can operate under static, charging and discharging conditions, compared with
Buck-based equalization circuits, the equalization time is reduced by 21%, 18% and 30%, respectively, and compared with Buck-Boost
equalization circuits, the equalization time is reduced by 17%, 29% and 15%, respectively. The equalization experiment of the battery
pack shows that the circuit can improve the consistency of these single batteries, control the SOC value range of the battery pack within
0. 1%, solve the problem of overcharge and over discharge of partial batteries, and improve the equalization efficiency. |
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