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Battery state of health estimation using charging resistance equivalent

  • US 10,042,006 B2
  • Filed: 06/11/2014
  • Issued: 08/07/2018
  • Est. Priority Date: 06/11/2014
  • Status: Active Grant
First Claim
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1. A method of communicating an estimated state of health of a battery to a vehicle component comprising:

  • calculating a number of charging equivalents for a number of healthy batteries of a particular type and rating;

    determining a charging current threshold value ThIc, a lower bound voltage ThV, and an upper bound current Thi from the calculated charging equivalents;

    providing a vehicle comprising an ignition, a vehicle battery, any number of sensors, and controller programmed to calculate an estimated battery state of health of a the vehicle battery;

    turning the vehicle ignition on;

    placing the vehicle battery in a steady state;

    using the sensors to collect readings including but not limited to a state of charge (SOC) reading, an open circuit voltage (OCV) reading, and multiple groups of terminal voltage readings and associated current readings from the vehicle battery after the vehicle battery has reached a steady state;

    using the controller to identify values that are terminal voltage readings and place them in a data structure V which can be iterated through;

    using the controller to identify values that are current readings and place them in a data structure I which can be iterated through;

    using the controller to identify all of the current readings (BatIc) and associated terminal voltage readings (BatVc) which are less than ThIc;

    using the controller to determine the value of the charging resistance equivalent ρ

    c by using at least some of the multiple groups of terminal voltage and associated current readings and OCV;

    using the controller to calculate an estimated battery state of health using ρ

    c; and

    using the controller to send a signal regarding the estimated battery state of health to another component in the vehicle.

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