摘要
磷酸铁锂电池作为一种高安全性、长寿命的锂离子电池体系,被广泛应用于储能系统、电动汽车等重要领域。电池在不同工况下的循环使用过程中会发生锂金属在负极非均匀沉积,为了明确析锂现象对电池电热稳定性的影响机制,提升电池性能,设计低温循环充放电实验来诱发电池析锂,对新电池和析锂后的电池进行过充和加热实验,并进行对比分析。实验结果表明:相较于新电池,析锂后电池的内阻随着过充容量的增加而增大得更迅速,析锂后电池的热稳定性与其析锂程度呈现明显的相关性,随析锂程度的增大电池热稳定性变差,甚至会发生热失控。这为后续电池的设计优化、充电管理策略设计、电池失效预防以及热失控预警具有重要的指导意义。
As a high safety and long life lithium ion battery system,the lithium iron phosphate batteries are widely used in energy storage systems,electric vehicles and other important areas.Non-uniform deposition of the lithium metal in the anode occurs during cycling of the battery under different working conditions.In order to clarify the influence mechanism of lithium precipitation phenomenon on the electrothermal stability of the battery and improve the battery performance,this study designs low temperature cyclic charge/discharge experiments to induce lithium precipitation in the battery,and carries out the overcharging and heating experiments on the new and the lithium precipitation batteries and conducts comparative analysis.The experimental results show that compared with the new battery,the internal resistance of the lithium precipitation battery increases more rapidly with the increase of the overcharge capacity,and the thermal stability of the lithium precipitation battery shows an obvious correlation with its degree of lithium precipitation,with the increase of lithium precipitation degree of the battery's thermal stability deteriorates,and even thermal runaway occurs.The conclusions are important for the subsequent design optimization of the battery,the design of charging management strategy,battery failure prevention and thermal runaway warning.
作者
雷二涛
宫辉
张浚坤
罗崴
马凯
金莉
陈泽平
LEI Ertao;GONG Hui;ZHANG Junkun;LUO Wei;MA Kai;JIN Li;CHEN Zeping(Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou,Guangdong 510080,China;School of Electrical Engineering,Beijing Jiaotong University,Beijing,100044,China)
出处
《广东电力》
北大核心
2024年第8期54-62,共9页
Guangdong Electric Power
基金
中国南方电网有限责任公司科技项目(GDKJXM20220717)
国家自然科学基金面上项目(51977007)。
关键词
磷酸铁锂电池
析锂
加热
过充
lithium iron phosphate battery
lithium precipitation
heating
overcharging
