Battery health monitoring system and method

摘要

A method and system for monitoring the health of a battery is provided. A precision frequency can be determined 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; collecting data related to the impedance response at a plurality of various states of charge within a recommended voltage window of the battery; plotting the collected data on one or more impedance curves; and analyzing the one or more impedance curves at the various states of charge to determine the precision frequency. Next, one of an AC current or voltage perturbation can be applied at the precision frequency resulting in an impedance response. The value of the impedance response can be recorded, and a determination can be made of a battery classification zone that the impedance value falls within.

主权项

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.