×

Battery fuel gauge

  • US 9,201,119 B2
  • Filed: 12/18/2012
  • Issued: 12/01/2015
  • Est. Priority Date: 12/19/2011
  • Status: Active Grant
First Claim
Patent Images

1. A method for estimating a battery state of charge (SoC) of a battery comprising:

  • a processor providing a representation of a battery model, the battery model comprising an open circuit voltage (OCV) component and an equivalent series resistance (Rseries) component;

    the processor acquiring a current measurement of the battery;

    the processor acquiring a voltage measurement of the battery;

    the processor computing a present estimate of the battery SoC using the current measurement, the voltage measurement, and a previous estimate of a battery voltage produced from an evaluation of the battery model;

    the processor evaluating the battery model to compute a present estimate of the battery voltage using at least a value of the OCV component and a voltage of the Rseries component; and

    the processor updating a value of the Rseries component when a condition is met, including acquiring at least a measurement of the voltage of the battery and using the measurement to compute an updated value of the Rseries component.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×