三元锂电池加速循环寿命模型的量化研究

Quantitative study on accelerated cycle life model of ternary lithium battery

三元锂电池的寿命与使用环境、负载特性等有关,目前,对三元锂电池循环寿命尚缺乏定量研究。在环境温度为25℃时,三元锂电池以1 C、3 C和5 C放电,基于逆幂律模型,建立了以电池中位寿命、特征寿命(0.632分位数寿命)、10%寿命、90%寿命、100%寿命及循环寿命衰减拟合的二次多项式系数为寿命特征的加速循环寿命模型。模型精度验证实验表明所建立的加速寿命模型能较为准确地预测三元锂离子电池寿命情况,具有一定的工程实践意义。

The cycle life of ternary lithium battery is related to the service environment and load characteristics.At present,there is a lack of quantitative research on the cycle life of ternary lithium batteries.The ternary lithium battery was discharged at 1 C,3 C and 5 C at 25℃,and based on the inverse power law model,the accelerated cycle life model was established with the median life,characteristic life(0.632 points life),10%life,90%life,100%life and quadratic polynomial coefficient fitted by cycle life attenuation as life characteristics.The model accuracy verification experiment proves that the accelerated cycle life model can accurately predict the life of ternary lithium-ion batteries.It has certain engineering practice significance.