磷酸铁锂锂离子电池循环寿命的加速模型

Acceleration model of cycle life of LiFePO_(4) Li-ion battery

在不同温度、倍率及放电深度(DOD)下,对磷酸铁锂正极锂离子电池循环寿命的加速模型进行研究。电池在55℃、45℃及25℃下以1.00 C在2.00~3.65 V循环时,循环寿命分别为379 h、2094 h及4379 h;在25℃下以2.00 C率循环时,循环寿命为1506 h。基于阿伦尼乌斯公式,分别构建电池的倍率及温度加速模型。该模型在一定加速应力范围内,可准确推算出电池在目标条件下循环时的寿命衰减规律,快速预测电池循环寿命,缩短测试时间。

The acceleration models for lithium iron phosphate(LiFePO_(4))cathode Li-ion battery were studied under different temperatures,rates and depth of discharge(DOD).When the battery was cycled under 55℃,45℃and 25℃at 1.00 C in 2.00-3.65 V,the cycle life was 379 h,2094 h and 4379 h,respectively.When the battery was cycled at 2.00 C under 25℃,the cycle life was 1506 h.Based on Arrhenius formula,the rate and temperature acceleration models for battery were established respec-tively.Within a certain range of accelerating stresses,the law of life decay of battery in cycle under the target condition could be accurately calculated by the model,which could predict the cycle life of battery rapidly and shorten the test time.