Traction Battery Controller Operable to Control Battery Based on Adaptive Sampled Electrochemical Impedance Spectroscopy Battery Measurements

A system, such as an electrified vehicle, includes a battery, such as a traction battery. The controller controls the battery based on adaptive sampled electrochemical impedance spectroscopy (EIS) measurements of the battery. The controller may perform the adaptive sampled EIS measurements. The controller may use the adaptive sampled EIS measurements to identify values of parameters of a model, such as an equivalent circuit model (ECM), of the battery. The controller may use the model, with the identified values of the parameters, to detect an internal state of the battery whereby the controller detects the internal state of the battery based on the adaptive sampled EIS measurements.