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

United States Patent Application

20150066406
A1
View the Complete Application at the US Patent & Trademark Office
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.
Sun, Jing (Superior Township, MI), Peng, Huei (Ann Arbor, MI), Weng, Caihao (Ann Arbor, MI)
14/ 469,117
August 26, 2014
GOVERNMENT CLAUSE [0002] This invention was made with government support under DE-PI0000012 awarded by the Department of Energy. The Government has certain rights in the invention.