Lithium plating detection based on characteristic impedance and sliding t-test with multi-stage current fast charging

doi:10.3969/j.issn.1674-8484.2024.03.007

Abstract

Abstract:

Under low temperature and high-rate charging, the graphite anode of lithium-ion battery will have a lithium plating phenomenon, which has a serious impact on the life and safety of the battery. An on-line detection method based on characteristic impedance and sliding t-test was proposed to realize the on-line detection of lithium plating of lithium-ion battery under variable current fast charge condition. The characteristic frequency impedance was measured in real time by superimposing 1 Hz sinusoidal excitation alternating current on the direct current charging. Based on the correlation between the change of the real part of characteristic impedance and the lithium plating of the negative electrode of the battery, an on-line detection method of lithium plating starting point based on sliding t-method was proposed for the fast-charging condition of variable current. The results show that this method can realize the delayed identification of the initial point of lithium plating within 5%SOC during the charging process, which is conducive to forming a closed-loop charging strategy and minimizing the harm of lithium plating.

Key words: lithium-ion battery, lithium plating, impedance, fast charging, sliding t-test

CLC Number:

TM911.3

HAO Zhenqi, WANG Xueyuan, LI Jiawei, DAI Haifeng, WEI Xuezhe. Lithium plating detection based on characteristic impedance and sliding t-test with multi-stage current fast charging[J]. Journal of Automotive Safety and Energy, 2024, 15(3): 344-350.

Figures/Tables 7

References 18

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正极材料	Li(NiCoMn) + (NiCoAl)O₂
负极材料	石墨
电池标称放电容量	2 750 mAh (C/3, 25 ℃)
充电截止电压	4.2 V
放电截止电压	2.5 V
最大充电电流	1 C (2.75 A)
最大持续放电电流	2 C (5.50 A)
工作温度	充电：0~45 ℃；放电： -20~60 ℃

正极材料	Li(NiCoMn) + (NiCoAl)O₂
负极材料	石墨
电池标称放电容量	2 750 mAh (C/3, 25 ℃)
充电截止电压	4.2 V
放电截止电压	2.5 V
最大充电电流	1 C (2.75 A)
最大持续放电电流	2 C (5.50 A)
工作温度	充电：0~45 ℃；放电： -20~60 ℃

实验编号	θ / ℃	N_b / C	y / %	N_a / C
#1	10	0.75	50	0.25
#2		0.75	50	0.5
#3		1	40	0.25
#4		1	40	0.5
#5	20	1.25	50	0.25
#6		1.25	50	0.5
#7		1.5	40	0.25
#8		1.5	40	0.5

实验编号	θ / ℃	N_b / C	y / %	N_a / C
#1	10	0.75	50	0.25
#2		0.75	50	0.5
#3		1	40	0.25
#4		1	40	0.5
#5	20	1.25	50	0.25
#6		1.25	50	0.5
#7		1.5	40	0.25
#8		1.5	40	0.5