Remaining useful life prediction of lithium batteries in calendar ageing for automotive applications

Abstract In this paper, a method for calendar ageing quantification of power batteries taking into account the State of Charge (SOC) and temperature ( T ) effects is presented. The main goal is the determination of the battery Remaining Useful Life (RUL). We focused on a single parameter identified from Electrochemical Impedance Spectroscopy (EIS) tests performed according to a specific protocol regarding thermal and electrical kinetics. This parameter refers to the impedance real-part at a defined frequency (0.1 Hz). It is used to identify the battery RUL. The choice of this frequency is based on the analysis of the changes of the real-part plots with ageing. From these plots, we noticed that the greatest influence of the ageing is observed in the [0.1 Hz, 1 Hz] frequency range.

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