ON-BOARD STATE OF HEALTH MONITORING OF BATTERIES USING INCREMENTAL CAPACITY ANALYSIS

摘要

A method is provided for determining capacity of a battery. The method includes: defining a model for a battery, where the model relates terminal voltage of the battery to charged capacity of the battery; taking a plurality of voltage measures of the battery, where the voltage measures are taken through a range of states of charge and the range excludes the battery being fully charged and fully discharged; determining the parameters of the model by fitting the plurality of voltage measures to the model; determining an incremental capacity curve for the battery by taking derivative of the model; and quantifying a peak of the incremental capacity curve to thereby determine a capacity of the battery.

主权项

1. A method for monitoring state of health of a battery, comprising:
defining a model for a battery, where the model relates terminal voltage of the battery to charged capacity of the battery in terms of unknown parameters; measuring voltage of the battery through a range of states of charge, where the range excludes the battery being fully charged and fully discharged; determining the unknown parameters of the model by fitting the voltage measures to the model; determining an incremental capacity curve for the battery by taking derivative of the model; and quantifying a peak of the incremental capacity curve, thereby determining a state of health for the battery.