Research on Cycle Life Test of Automotive Ternary Lithi-um Battery Based on Grey Model
The ternary lithium-ion power battery for vehicles is currently one of the main components of the power system of new energy vehicles in China.Its performance will undergo irreversible degrada-tion with the decrease of cycle life,which will affect the overall vehicle performance such as driving range.The influence of environmental temperature on the cycle life of ternary lithium batteries was studied through cycle life tests under environmental conditions of 15℃,25℃,and 45℃.The experi-mental results show that when the capacity decay is 88%of the initial capacity,the cycle life under 45℃condition is one-third of that under 15℃condition.At the same time,a cycle life prediction mod-el for ternary lithium batteries was established based on the grey model and validated.The results showed that the prediction accuracy of the model under different environmental temperatures was be-low 1%,laying a foundation for subsequent practical applications.
Automotive Ternary Lithium BatteryCycle LifeGrey ModelExperimental Research