A Lithium-ion Battery Fractional Order Model and Its Time-domain Parameter Identification Method

摘要

This paper deals with a fractional order model for the lithium-ion battery and presents its parameter identification method in time-domain.As we know,the equivalent circuit models are mostly used to simulate the performance of the battery system.But real processes interiorly always involves with ion migration,redox reaction,hysteresis effects and so on,which are usually of fractional order as opposed to the ideal integral order models.So a lithium-ion battery fractional order model is proposed here,and compared with the lumped parameter model,to see which model fits with the experimental results best.Then the pulse current profile,as one identification sequense,has been implemented upon the lithium-ion battery during varied state-of-charge (SOC).Based on the minimum residual sum of squares method,the parameters for each model have been obtained using the time domain test data.Lastly,the DST profile has been used to validate each model's performance.Experimental results show that,for containing more information,the proposed lithium-ion fractional order model fits more precisely than the classical equivalent circuit model and has better generalization ability.