钴酸锂电池低温特性和针刺安全性能研究
Research on low temperature characteristics and pinning safety performance of lithium cobalt oxide batteries
钱广俊 1郑岳久 1卢兰光 2孙跃东 1韩雪冰2
作者信息
- 1. 上海理工大学 机械工程学院,上海 200093
- 2. 清华大学 车辆与运载学院,北京 100084
- 折叠
摘要
以低温下工作的钴酸锂(LCO)电池为研究对象,通过实验研究其在低温下的特性和热失控温度变化情况.首先,通过不同温度下的容量测试,对比了-30℃时三元锂离子电池与LCO电池的容量保持率,结果表明,LCO电池在-30℃低温放电容量保持率几乎达到三元锂离子电池的2 倍;其次,利用混合功率脉冲特性测试得到了不同温度下电池的内阻;接着,对低温下LCO电池电化学阻抗进行测试,结果表明,-10,-20,-30℃时的电荷转移阻抗较 0℃时分别增加了180%,702%,2 400%;最后,对LCO进行针刺热失控实验,结果表明,钢针刺破电池背面后,电池表面最高温度不超过 530℃,伴有少量火星,很快产生大量烟雾,并没有发生着火的现象.
Abstract
This study is centered on exploring the characteristics of lithium cobalt oxide(LCO)batteries under low-temperature conditions and investigating the temperature fluctuations associated with thermal runaway events.Firstly,capacity tests were conducted at varying temperatures to compare the capacity retention rates of ternary lithium-ion batteries and LCO batteries at-30℃.These tests revealed that LCO batteries nearly doubled their discharge capacity in comparison to ternary lithium-ion batteries at this temperature.Secondly,the internal resistance of the batteries was obtained by using the mixed-power pulse characterization test at different temperatures.Then,testing was conducted on the electrochemical impedance of LCO batteries under low-temperature conditions,revealing that at-10℃,-20℃,and-30℃,the charge transfer impedance increases by 180%,702%,and 2 400%,respectively,compared to 0℃.Finally,a nail penetration experiment was executed on the LCO batteries and found that the maximum temperature of the battery surface was not more than 530℃after a steel needle pierces the back of the battery,which was accompanied by a small amount of sparks.Subsequently,substantial smoke generation occurred without any indication of a fire event.
关键词
钴酸锂电池/容量保持率/电荷转移阻抗/针刺实验Key words
lithium cobalt oxide batteries/capacity retention/charge transfer impedance/nail penetration experiment引用本文复制引用
基金项目
国家自然科学基金资助项目(52177217)
北京市自然科学基金资助项目(3212031)
出版年
2024
NETL
NSTL
万方数据