Cycle life test and analysis of lithium iron phosphate based traction batteries

doi:10.19799/j.cnki.2095-4239.2020.0007

Abstract

Abstract:

With the extension of the life cycle of electric vehicles, the traction battery has gradually entered the scrapping stage. In this paper, the lithium iron phosphate chemistry traction battery is taken as the research object. Based on the electrical conditions of the communication base station, the available cycle test verification of the temperature and constant voltage charging is carried out. The research results show that when the ambient temperature of the standby electrical condition increases, the performance degradation of the sample is obviously accelerated, and the trend of nonlinear acceleration attenuation occurs. When the constant voltage charging of the standby electrical condition changes, the difference in the available capacity attenuation trend of the sample is small, and the variation of the internal resistance of the discharge DC is significant. The research results show that when the lithium iron phosphate traction battery is reused in the standby electrical condition, it is necessary to control the ambient temperature and the constant voltage charging according to the actual working conditions.

Key words: lithium iron phosphate cells, re-use, backup applications, cycle life

CLC Number:

TM 912

LIU Shiqiang, WANG Fang, MA Tianyi, LIN Chunjing, BAI Guangli, WEI Zhen, CHEN Liduo. Cycle life test and analysis of lithium iron phosphate based traction batteries[J]. Energy Storage Science and Technology, 2020, 9(2): 638-644.

Figures/Tables 13

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指标	参数
体系	磷酸铁锂
标称容量/mAh	25000
标称电压/V	3.2
内阻/ mΩ	2.0
充电截止电压/V	3.65
放电截止电压/V	2.2
最大充电电流/C	1
最大放电电流/C	3
工作温度/℃	充电条件: 0~45 放电条件: -20~60
尺寸/mm	203×134×9.3
重量/g	540±25

温度/℃	a	b	R²
25	0.9994	-2.08971×10^-4	0.98521
35	0.9976	-2.24975×10^-4	0.98569
45	0.9973	-3.52204×10^-4	0.98712
55	0.9959	-6.14394×10^-4	0.99132

温度/℃	寿命/年
25	5.0
35	4.2
45	2.3
55	1.3

温度	m	n	R²
3.5	1.001	-1.636	0.99662
3.55	1.001	-1.3577×10^-4	0.99715
3.6	1.001	-1.3341×10^-4	0.99778
3.65	1.002	-1.5352×10^-4	0.99748

充电电压/V	寿命/年
3.5	5.0
3.55	5.8
3.6	6.3
3.65	5.0