A Lithium-Ion Battery Equalization Strategy Using Improved Matrix-Type Reconfigurable Topology

doi:10.7652/xjtuxb202406016

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A Lithium-Ion Battery Equalization Strategy Using Improved Matrix-Type Reconfigurable Topology

更新时间：2025-07-28

- A Lithium-Ion Battery Equalization Strategy Using Improved Matrix-Type Reconfigurable Topology
- Vol. 58, Issue 6, Pages: 174-185(2024)
- 作者机构：
  
  1. 长安大学能源与电气工程学院,西安,710064
  2. 河南交通投资集团有限公司河南交投服务区有限责任公司,郑州,450016
  3. 长安大学电子与控制工程学院,西安,710064
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202406016
  CLC： TM911.3
- Online First：10 June 2024，
  
  Published：2024
- 稿件说明：
移动端阅览
A Lithium-Ion Battery Equalization Strategy Using Improved Matrix-Type Reconfigurable Topology[J]. 2024, 58(6): 174-185.
DOI：

A Lithium-Ion Battery Equalization Strategy Using Improved Matrix-Type Reconfigurable Topology[J]. 2024, 58(6): 174-185. DOI： 10.7652/xjtuxb202406016.

摘要

为解决串联锂离子电池组中各电池特性(或参数)不一致性问题

提出了一种采用改进矩阵型可重构拓扑的锂离子电池组均衡策略。将电池组中各电池的荷电状态作为均衡目标参数

通过开关矩阵控制电池小组在串联与并联拓扑之间来回切换

实现各电池单体及电池小组之间的均衡

并通过隔离荷电状态最低的电池单体或电池小组加快均衡速度。使用MATLAB/Simulink软件进行仿真

并与原矩阵型可重构均衡策略进行对比

仿真结果表明:与原矩阵型可重构均衡策略相比

改进均衡策略在负载为10、20和40 W时可分别提升13.1%、27.1%和30.1%的均衡速度; 在考虑开关导通电阻时

所提出的改进均衡策略在均衡过程后期通过荷电状态差值造成的电压差加速了均衡过程

在导通电阻较大时仍能有效均衡电池组

有效地避免了原矩阵型可重构均衡策略的均衡效果随导通电阻增大而变差

甚至无法均衡电池组的缺陷

成功达到均衡目标。由此证明所提的改进矩阵型均衡策略相较于原矩阵型均衡策略具有更好的均衡效果。

Abstract

To solve the problem of inconsistency in the characteristics(or parameters)of cells in a series-connected lithium-ion battery pack

a lithium-ion battery pack equalization strategy using an improved matrix-type reconfigurable topology is proposed in this paper. The strategy takes the state of charge(SOC)of each cell in the battery pack as the equalization target parameter

and uses the switching matrix to control the switching of battery groups between series and parallel topologies and realize the equalization between battery cells and battery groups

and accelerates the equalization speed by isolating the cell or battery group with the lowest SOC. Simulation results using MATLAB/Simulink and comparison with the original matrix reconfigurable equalization strategy show that

compared with the original matrix reconfigurable equalization strategy

the improved strategy can improve the equalization speed by 13.1%

27.1% and 30.1% under the loads of 10

20 and 40 W

respectively. Taking the switch on-resistance into consideration

the improved strategy proposed accelerates the equalization process through the voltage difference caused by the SOC difference at the later stage of the equalization process

and can still effectively equalize the battery pack when the on-resistance is high

which effectively avoids the defects that the equalization effect of the original matrix-type reconfigurable equalization strategy deteriorates or even fails with the increase of on-resistance

and achieves the equalization target successfully. This proves that the improved matrix-type equalization strategy proposed has a better equalization effect compared with the original matrix-type equalization strategy.

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references

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