磷酸铁锂动力电池常规循环过程中安全特性  

Safety behaviors of LiFePO4 power battery during normal cycles

作　　者：王芳[1] 樊彬[1] 刘仕强[1] 张振鼎[1] 黄炘[1] 张文华[2] 

机构地区：[1]中国汽车技术研究中心 [2]江西省电力科学研究院

出　　处：《汽车安全与节能学报》2014年第2期180-184,共5页Journal of Automotive Safety and Energy

基　　金：国家"八六三"高技术项目(2011AA11A286)

摘　　要：动力电池的安全性一直是电动汽车行业关注的焦点。本文对某款磷酸铁锂动力电池，进行了针刺、挤压、热箱等安全滥用测试，以研究该款电池在不同循环时期的安全性变化规律。分析了该电池在经历100-500次循环周期测试后的热稳定性参数和电池循环寿命的关系。结果表明：以自生热放热起始点为参照，循环前的电池并不具有最高的热活性；随着循环次数的增加，该款电池的热活性先增强后减弱。这一现象可归结为：电池循环过程中，电池内部活性物质逐渐活化，逐渐发挥到最佳性能，之后活性又逐渐降低。The safety of lithium-ion traction batteries is a key point during the development of electric vehicles. Some safety abuse tests, such as the penetration test, the crush test and the heat test, were done to investigate the safety characteristic change in different cycles for a lithium iron phosphate power battery. The relationship between the thermal abuse behavior parameters and the battery cycle life was analyzed before and after 100~500 cycles. The results show that according to the starting point of self-heating, fresh batteries have not the highest thermal activities; battery thermal activities firstly increase, then decrease along with the cycle time increasing. This phenomenon can be attributed to that the active materials in battery activate gradually to achieve the best performance, afterwards decrease with increasing cycles.

关 键 词：电动汽车 动力电池 安全性 常规循环 热特性 

分 类 号：TM912.9[电气工程—电力电子与电力传动]