过充电条件下锂离子电池热失控数值模拟

发布时间：2018-05-25 04:17

本文选题：锂离子电池 + 热失控　；参考：《北京理工大学学报》2017年10期

【摘要】：采用数值模拟方法研究了过充电流(1C、2C、3C和4C)对三元锂离子电池热失控行为的影响.基于多物理场耦合方法建立了过充电条件下锂离子电池三维电-热耦合模型,对电池发生热失控的临界时间,临界温度以及热分布进行了模拟计算.模拟结果与试验测量结果符合较好,各个测试点处的温度和热失控临界点的误差小于8%.过充电流对锂离子电池热失控的临界温度、临界时间以及电池内外部温差有较大影响:过充电流越大,电池发生热失控的时间越短,临界温度越高,区域温差越大,内外部温差越大.
[Abstract]:The effect of overcharging current (1CX 2C3C and 4C) on the thermal runaway behavior of lithium-ion ternary batteries was studied by numerical simulation. Based on the multi-physical field coupling method, a three-dimensional electric-thermal coupling model of lithium ion battery under overcharge condition was established. The critical time, critical temperature and thermal distribution of the battery were simulated and calculated. The simulation results are in good agreement with the experimental results. The error of temperature and thermal runaway critical point at each test point is less than 8. The overcharge current has a great influence on the critical temperature, critical time and the temperature difference between the inner and outer parts of the lithium ion battery: the larger the overcharging current, the shorter the time of heat runaway, the higher the critical temperature, the greater the regional temperature difference. The greater the temperature difference between the interior and the exterior.
【作者单位】：北京理工大学机电学院;中国电力科学研究院;
【分类号】：TM912

【相似文献】