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

Abstract

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

CLC Number:

TN710

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.

Figures/Tables 14

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Table 1.

Fuzzy rule base"

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

Table 1.

Figure 7.

Figure 8.

Figure 9.

Figure 10.

Table 2.

Figure 11.

Figure 12.

References 21

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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

Intelligent Equalization Method of Battery Pack Based on Two-Level Equalization Circuit

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