摘要
为评估磷酸铁锂(LiFePO_4)动力锂离子电池内短路时的安全问题,采用陶瓷顶盖结构的单体电池与1+5只并联连接电池的穿刺实验,分析电池表面温度、开路电压及涌流变化情况。不论连接方式和穿刺位置如何,均是靠近正极极耳的监控点温度最高,最高可达442.5℃,且前期该处温度迅速上升,后期逐渐降低;电解液浓度越低,电池内阻越大;穿刺接触电阻越小,电池表面温度越高,并联连接的被刺电池瞬间反充电流较大,最大可达256.0 A;电池未出现着火现象,穿刺安全性能得到提高。
In order to evaluate safety problem during internal short circuit of lithium iron phosphate（LiFePO4） power Li-ion battery,temperature on the surface of battery with ceramic cap,open circuit voltage and inrush current were analyzed by the nail penetration test of single and parallel connection battery respectively.No matter what the connection and nailing position were,the monitored temperature on the surface of battery near positive pole ear was higher than one in other places during nail test,which could reach the maximum value of 442.5 ℃,increased rapidly in the early stage and then decreased gradually,the bigger electrolyte concentration caused the greater internal resistance.The smaller nailing contact resistance caused the higher temperature on the surface of battery,then instantaneous charged current of the nailed battery in parallel connection became lager,the maximum value of which could reach 256.0 A.The safety performance of the battery with ceramic cap was improved.
出处
《电池》
CAS
CSCD
北大核心
2017年第1期23-26,共4页
Battery Bimonthly
基金
广东省青年创新人才类项目(自然科学类)(2015KQNCX190)
广东科技学院自然科学类重点科研项目(GKY-2014KYZD-1)
关键词
磷酸铁锂(LiFePO4)
动力锂离子电池
穿刺
内短路
涌流
lithium iron phosphate（LiFePO4）
power Li-ion battery
nail penetration
internal short circuit
inrush current
