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-LiFePO4 and NMC-LiNiMnCoO2)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
Key words
Battery cycle life model/capacity loss curve/equivalent cycle counting/generic battery model/lithium-ion battery
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