基于两级均衡电路的电池组智能均衡方法

doi:10.16180/j.cnki.issn1007-7820.2024.07.002

摘要/Abstract

摘要：

为解决传统均衡电拓扑均衡效率较低的问题,文中提出了一种两级均衡拓扑结构。该均衡拓扑将电池组分为组内与组间两种形式,组内采用Buck-Boost均衡电路,组间采用可重构均衡电路,组内与组间可同时均衡,提高了均衡效率。以SOC(State of Charge)作为均衡变量,组内均衡算法采用基于SOC的模糊逻辑控制策略,减少均衡时间,提高均衡效率。使用MATLAB/Simulink软件对电路拓扑建模仿真,并与传统Buck-Boost电路进行对比。仿真结果表明,在充放电状态下,相较于传统Buck-Boost电路,所提算法及均衡拓扑使均衡时间减少了约28%,表明该均衡电路及算法具有良好的性能。

关键词: 电动汽车, 锂离子电池, 电池组均衡, 两级均衡电路, 模糊逻辑控制, SOC, Buck-Boost电路, 可重构电路

Abstract:

In order to solve the problem of low efficiency of traditional balanced electric topology, a two-level balanced topology is proposed. This balancing topology divides the battery pack into two forms: Intra-group and inter-group. Buck-Boost equalization circuit is used in the group, and reconfigurable equalization circuit is used between the groups. The intra-group and inter-group can be equalized at the same time, which improves the equalization efficiency. Taking SOC(State of Charge) as the equalization variable, the intra-group equalization algorithm adopts the fuzzy logic control strategy based on SOC to reduce the equalization time and improve the equalization efficiency. MATLAB/Simulink software is used to model and simulate the circuit topology and the results are compared with the traditional Buck-Boost circuit. The simulation results show that compared with the traditional Buck-Boost circuit, the proposed algorithm and equalization topology reduce the equalization time by about 28% under the charge-discharge state, indicating that the equalization circuit and algorithm have good performance.

Key words: electric vehicle, lithium ion battery, battery pack balance, two-stage balance circuit, fuzzy logic control, SOC, Buck-Boost circuit, reconfigurable circuit

中图分类号:

TN710

任子豪, 田恩刚. 基于两级均衡电路的电池组智能均衡方法[J]. 电子科技, 2024, 37(7): 9-15.

REN Zihao, TIAN Engang. Intelligent Equalization Method of Battery Pack Based on Two-Level Equalization Circuit[J]. Electronic Science and Technology, 2024, 37(7): 9-15.

图/表 14

图1

图2

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图6

表1

模糊规则库"

D		ΔSOC
D		VS	S	M	L	VL
$S O C ¯$	S	S	M	L	L	VL
	M	M	M	M	L	L
	L	VS	S	S	S	M

表1

图7

图8

图9

图10

表2

图11

图12

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电池编号	初始 SOC/%	传统电路均衡 SOC/%	本文所提电路均衡 SOC/%	传统电路均衡时间 /s	本文所提电路均衡时间/s
B₁	70.0	73	68	298	232
B₂	67.9	73	68	298	232
B₃	65.6	73	68	298	232
B₄	63.7	73	68	298	232
B₅	61.3	73	68	298	232
B₆	56.8	73	68	298	232
B₇	54.2	73	68	298	232
B₈	51.5	73	68	298	232
B₉	48.9	73	68	298	232