磷酸铁锂电池循环老化后不同SOC状态热特性研究  

Thermal characteristics of lithium-iron phosphate batteries under different SOCs after cycles

作　　者：陈欣蕊 谭立志[1] 赵彦民[1] 宁凡雨 王松蕊[1] CHEN Xinrui;TAN Lizhi;ZHAO Yanmin;NING Fanyu;WANG Songrui(Science and Technology on Power Sources Laboratory,Tianjin Institute of Power Sources,Tianjin 300384,China)

机构地区：[1]中国电子科技集团公司第十八研究所化学与物理电源重点实验室,天津300384

出　　处：《电源技术》2021年第7期877-880,共4页Chinese Journal of Power Sources

基　　金：国家重点研发计划(2018YFB0104400)。

摘　　要：利用加速量热仪(ARC)对经过1 C充放电循环100次后的18650型磷酸铁锂电池在不同SOC绝热条件的热特性进行研究,并对ARC实验后的电池进行解剖分析。结果表明:磷酸铁锂电池在10%SOC和50%SOC状态下升温至159℃泄压阀破裂降温,而后电池不再升温,未发生热失控;在100%SOC状态下159℃左右短暂降温,然后继续升温,从174℃开始升温速率持续升高,温度达到191℃时升温速率为1℃/min,在220℃时升温速率为2.4℃/min(0.04 K/s),随后温度急剧升高,最终发生热失控,最高温度达到340℃;随着SOC的增大ARC实验造成的电池质量损失随之增大,隔膜的受损程度也增大,10%SOC闭孔,50%SOC破损,100%SOC熔化。The thermal characteristics of 18650 type lithium iron phosphate batteries with different SOC adiabatic conditions were studied by means of accelerating rate calorimeter(ARC),and the batteries after ARC experiment were dissected.The results show that the lithium-iron phosphate batteries under 10%SOC and 50%SOC do not go into thermal runaway due to the pressure relief and heat dissipation of valves breaking down at 159℃.At 100%SOC,the temperature drops slightly at 159℃,and then keeps rising;from 174℃,the temperature heating rate continues to rise;when the temperature reaches 191℃,the heating rate is 1℃/min;when the temperature reaches 220℃,the heating rate is 2.4℃/min(0.04 K/s);soon afterwards,the temperature rises sharply,and the thermal runaway occurs following the maximum temperature of 340℃.With the increase of SOC,the mass loss of the battery caused by ARC experiment increases,and the damage degree of separator increases.The separator will close at 10%SOC,is damaged at 50%SOC,and is melted at 100%SOC.

关 键 词：锂离子电池 磷酸铁锂 绝热条件 热失控 

分 类 号：TM912.9[电气工程—电力电子与电力传动]