镍钴锰酸锂(NCM)三元锂电池的容量衰减加速测试

Cycle Life Decay Accelerated Testing of Li(NiCoMn)O2 Lithium ion Battery

以镍钴锰酸锂三元锂电池为例,通过容量衰减数据推导其循环寿命衰减内在的联系,使用二项式拟合,构建Arrenius数学模型,探讨不同温度下的多项式系数之间的内在联系,获得不同温度下电池容量衰减规律,从而建立和完善一种电池容量衰减的加速测试与评估方法。利用高温下容量衰减加速的寿命数据推导出动力电池常温下实际的容量循环寿命,可以有效地解决电池循环寿命测试周期长和成本高昂的问题。

Combining capacity attenuation data of NCM based lithium batteries and binomial fitting method,here,we utilize Arrenius mathematical model to discuss inherent relation and regularity between polynomial coefficients and testing temperatures,and then construct and optimize a standard method to evaluate cycling life of lithium batteries.Using accelerated aging test at high temperature to predict the actual capacity cycle life of power battery at room temperature,it is an efficient and useful method to reduce testing time and lower cost.