磷酸铁锂动力电池备电工况寿命试验研究及分析

doi:10.19799/j.cnki.2095-4239.2020.0007

摘要/Abstract

摘要：

随着新能源汽车使用周期的增长，车用动力电池逐渐进入报废阶段。本工作以电动汽车用磷酸铁锂动力电池为研究对象，基于通信基站备电工况，开展了温度和恒压充电电压双因素工况的可用周期试验验证工作。研究结果表明，当备电工况的环境温度增高时，样品的性能衰减明显加速，出现非线性加速衰减的趋势；当备电工况的恒压充电电压变化时，样品的可用容量衰减趋势差异较小，放电直流内阻的变化差异明显。研究结果说明，当磷酸铁锂动力电池在备电工况再利用时，需要根据实际工况需求控制环境温度和恒压充电电压。

关键词: 磷酸铁锂电池, 梯次利用, 基站备电工况, 使用寿命

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

中图分类号:

TM 912

刘仕强, 王芳, 马天翼, 林春景, 白广利, 韦振, 陈立铎. 磷酸铁锂动力电池备电工况寿命试验研究及分析[J]. 储能科学与技术, 2020, 9(2): 638-644.

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.

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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