Patent ID: 9465077
Filing Date: 2016-10-11
CPC Classification: G01R

Claim Text:
1. A method for monitoring the health of a battery, comprising the steps of: determining a precision frequency for the battery by applying one of an AC current or voltage perturbation across a frequency sweep with impedance spectroscopy equipment to obtain an impedance response and collecting impedance value data related to the impedance response at a plurality of various states of charge within a recommended voltage window of the battery; applying one of an AC current or voltage perturbation at the precision frequency resulting in an impedance response; recording a value of the impedance response; and determining a battery classification zone that the impedance value falls within, wherein the precision frequency is determined by where the impedance values are nearly the same across the various states of charge, wherein the precision frequency is a frequency at which the standard deviation of the impedance value data is the smallest between the varying states of charge.