摘要
针对锂离子电池热失控引发的民航运输安全问题,利用自主设计的试验平台,以21700型三元锂离子电池为研究对象,探究了不同荷电状态(SOC)的锂离子电池热失控危险特性,包括表面温度、开路电压、电池内阻与质量损失。研究结果表明:21700型单体锂离子电池比18650型锂离子电池额定容量增加了35%,能量密度提高了20%,若出现热安全问题时会更加危险。随着SOC的增加,21700型锂离子电池发生初爆与燃爆的时间间隔缩短。当SOC为20%时,初爆与燃爆时间间隔最长,为471 s;当SOC为40%、60%、80%和100%时,初爆与燃爆时间间隔分别缩短2.5%、18.0%、26.5%和34.0%。锂离子电池发生热失控过程中的表面温度峰值、温升速率与质量损失均随着SOC的增加而增加。锂离子电池在不同荷电状态下发生热失控时,开路电压和电池内阻变化具有一定的规律性。
Based on the civil aviation transportation safety problem caused by thermal runaway of lithium-ion batteries,an experimental platform was designed independently.The 21700 ternary lithium-ion battery was examined to explore the thermal runaway hazard characteristics of lithium-ion batteries under the different state of charge(SOC),including surface temperature,open circuit voltage,internal resistance of battery and mass loss.The research results show that compared with the 18650 lithium-ion battery,the capacity of the 21700 lithium-ion battery increases by 35%and energy density increases by 20%,which is more dangerous if lithium-ion battery is triggered therma runaway.The time interval between the initial blast and the violent explosion stage of 21700 lithium-ion battery are shortened with the increase of the SOC.When SOC is 20%,the time interval between the initial blast and the violent explosion stage is longest,that is 471 s.When SOC is 40%,60%,80%and 100%,the time interval can be reduced by 2.5%,18.0%,26.5%and 40.0%,respectively.At the same time,during lithium-ion battery thermal runaway,the peak temperature,temperature rise rate and mass loss increase with increasing of SOC.Furthermore,when lithium-ion battery causes thermal runaway under different SOC,the open circuit voltage and internal resistance of batteries have certain regularity.
作者
郭君
王海斌
贺元骅
GUO Jun;WANG Haibin;HE Yuanhua(College of Civil Aviation Safety Engineering,Civil Aviation Flight University of China,Guanghan 618307,China)
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2020年第6期32-38,M0004,共8页
Journal of Henan University of Science And Technology:Natural Science
基金
国家重点研发计划基金项目(2018YFC0809500)
国家自然科学基金项目(U1633203)
中国民航飞行学院大学生创新项目(S201910624238)。
