Research on charging strategy of lithium-ion battery system at low temperature

doi:10.19799/j.cnki.2095-4239.2021.0493

Abstract

Abstract:

The new energy vehicle industry is developing rapidly, and the sales of electric vehicles have repeatedly hit new highs. How to charge electric vehicles efficiently and economically at low temperatures in winter is still an urgent problem to be solved. A charging strategy at a low temperature for lithium battery systems is proposed and improved based on the principle that the battery generates heat by itself during charging. Taking the minimum single battery temperature as the judgment condition, the use of multi-stage constant current charging technology can effectively shorten the charging time and ensure sufficient charging capacity. Research and experiments show that this strategy has a good charging effect, and specific charging schemes can be formulated according to actual needs, which can effectively solve the charging problem of lithium-ion battery systems at low temperatures in winter.

Key words: lithium battery, power battery, charging at low temperature, constant current charging, battery heating

CLC Number:

TM 912

Suhang WANG, Jianlin LI, Yaxin LI, Junjie XIONG, Wei ZENG. Research on charging strategy of lithium-ion battery system at low temperature[J]. Energy Storage Science and Technology, 2022, 11(5): 1537-1542.

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项目名称	项目参数
电池体系	磷酸铁锂
单体充电保护电压	3.65 V
单体放电保护电压	2.5 V(常温)
系统充电截止电压	350.4 V
系统放电终止电压	240 V(常温)
额定容量	104 Ah

步骤	截止条件
恒流0.4 C充电	最小单体温度为0 ℃
恒流0.6 C充电	最小单体温度为10 ℃
恒流1.0 C充电	最大单体电压为3.65 V

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