基于活化能的功率型动力电池寿命影响因素分析  

Influence Factor Analysis of High Power Li-ion Battery Life on Activation Energy

作　　者：康振华 凌鑫晨 万里平 江吉兵 刘建华 KANG Zhenhua;LING Xinchen;WAN LiPing;JIANG Jibing;LIU Jianhua(EVE Energy Co.,Ltd.,Huizhou 516000,Guangdong,China)

机构地区：[1]惠州亿纬锂能股份有限公司,广东惠州516000

出　　处：《能源研究与管理》2024年第3期79-84,共6页Energy Research and Management

摘　　要：为从机制层级分析功率型动力电池寿命的影响因素,以不同外部影响因素下的日历存储和循环寿命数据为样本,并结合Arrhenius方程,建立活化能为评价因子的寿命影响分析方法。结果表明:存储荷电态(SOC)对日历寿命的影响较大,磷酸铁锂电池在70%SOC附近存储,稳定性最差,日历寿命衰减最快。充放电电流是影响磷酸铁锂电池循环寿命的重要因素,大电流会加剧SEI膜反应和活性锂消耗的速率,使电池活化能降低,循环老化速度加剧。而充放电SOC区间对功率型动力电池的循环寿命影响不大,电池可以在SOC为20%~90%内的任意区间使用。通过对功率型动力电池的寿命影响因素及衰减原因的分析,提高了对功率型动力电池老化特性的认识,为动力电池长周期使用提供了科学依据。In order to analyze the influence factors of life on mechanism level,the calendar and cycle life data of different external influencing factors were taken as samples,and combined with Arrhenius equation,the assessment method on activation energy was established to analysis the life effect.The results showed that state of charge(SOC)of storage has a great influence on calendar life,and the stability of batteries is the worst,and fade fastest while storage SOC of lithium iron phosphate battery is around 70%.Current is an important factor affecting the cycle life of lithium iron phosphate battery,and the SEI film reaction and the consumption of active lithium will be accelerated under heavy current,the activation energy of the battery reduces,and cycle life will be aggravated.The SOC ranges of charging and discharging has little impact on cycle life of high power battery,and the battery can be used in any SOC ranges within 20%-90%.The understanding of life characteristics of high power battery has been improved through the analysis of the factors affecting the life of power battery and the attenuation reasons,and provided a scientific basis for the long-term use of power battery.

关 键 词：日历寿命 循环寿命 活化能 电流 荷电态 

分 类 号：TM912[电气工程—电力电子与电力传动]