METHOD AND APPARATUS FOR MONITORING A BATTERY STATE ESTIMATOR

A method and associated system for managing a battery cell includes determining, for a battery cell, a plurality of battery cell parameters; developing a plurality of on-vehicle reduced order linear data-driven battery models based upon the battery cell parameters, wherein each of the plurality of on-vehicle reduced order linear data-driven battery models determines corresponding model parameters; selecting one of the corresponding model parameters for one of the plurality of on-vehicle reduced order linear data-driven battery models based upon a previous state of charge for the battery cell; executing a derivative-free observer to determine a present state of charge (SOC) of the battery cell based upon the corresponding model parameters; and controlling the battery cell based upon the SOC.