Abstract: To solve the problem that the existing models of LiFePO₄ lithium-ion batteries have low accuracy when simulating the high current rate charge/discharge properties,this paper revised the key electrochemical reaction coefficient of a simplified electrochemical model according to the current rate.The revised model corrects the terminal voltage platform deviations caused by the intensified internal electrochemical reaction,and realized accurate simulation of the terminal voltage during high current rate charge/discharge.Moreover,the revised model is experimentally verified on a 45 Ah cylindrical LiFePO₄ lithium-ion battery.

Key words: lithium-ion battery, high current-rate, parameter modification, electrochemical model