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

  • US 20150066406A1
  • Filed: 08/26/2014
  • Published: 03/05/2015
  • Est. Priority Date: 08/27/2013
  • Status: Active Grant
First Claim
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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.

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