基于疲劳理论和等效循环数的锂电池循环寿命预测方法  

Prediction Method for Lithium Battery Cycle Life Based on Fatigue Theory and Equivalent Cycle Number

作　　者：钱伟杰 高强 吴晶莹 叶承晋[4] 罗文俊 QIAN Weijie;GAO Qiang;WU Jingying;YE Chengjin;LUO Wenjun(Jiaxing Power Supply Company,State Grid Zhejiang Electric Power Co.,Ltd,Jiaxing 314000,China;State Grid Zhejiang Electric Power Co.,Ltd,Hangzhou 310008,China;Zhejiang Electric Power Trading Center Co.,Ltd,Hangzhou 310008,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310058,China;Wuhan NARI Co.,Ltd,State Grid Electric Power Research Institute,Wuhan 430073,China)

机构地区：[1]国网浙江省电力有限公司嘉兴供电公司,嘉兴314000 [2]国网浙江省电力有限公司,杭州310008 [3]浙江电力交易中心有限公司,杭州310008 [4]浙江大学电气工程学院,杭州310058 [5]国网电力科学研究院武汉南瑞有限责任公司,武汉430073

出　　处：《电源学报》2024年第6期234-243,共10页Journal of Power Supply

基　　金：中央高校基本科研业务费专项资金资助项目(2021QNA4012)。

摘　　要：针对目前锂电池循环寿命模型中物理参数难以获取,参数识别过程需要大量测试,以及锂离子电池循环效应的模拟难以实现且成本昂贵等问题,探究锂离子电池老化(由于循环)的电气模拟及其对电池容量和内阻的影响,提出1种锂离子电池的新型循环寿命模型。基于疲劳理论和等效循环计数建立简单的物理方程,参数识别过程简单,仅需电池数据表中的少量数据和有限(或短时间)的循环实验。所提模型为通用型,能够表示常见循环寿命因素的影响,如放电深度、温度和C速率。利用LFP-LiFePO_(4)和NMC-LiNiMnCoO_(2)这2种锂离子电池对模型进行验证,模拟结果与实际情况近似,与实验结果相比误差在1.5%以内。At present,the physical parameters of a lithium battery cycle life model are difficult to obtain,and the parameter identification process needs a lot of experimental data and a long test time.In addition,it is difficult and expensive to simulate the cycling effect of lithium-ion batteries.On this basis,in order to explore the electrical stimulation of lithium-ion battery aging(due to cycling)and its effect on the battery capacity and internal resistance,a novel cycle life model of lithium-ion battery is proposed.First,a simple physical equation is established based on the fatigue theory and equivalent cycle counting.The parameter identification process is simple,requiring only a small amount of data in the battery data table and a limited(or short)cycle test.The proposed model is general and can represent the effects of common cycle life factors such as depth-of-discharge,temperature and C rate.Finally,two kinds of lithium-ion batteries(i.e.,LFP-LiFePO_(4) and NMC-LiNiMnCoO_(2))are used to verify the model.The simulation results are close to the actual situation,and the error is within 1.5%compared with the experimental results.

关 键 词：电池循环寿命模型 容量损失曲线 等效循环计数 通用电池模型 锂离子电池 

分 类 号：TM91[电气工程—电力电子与电力传动]