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System and method for prognosis of batteries

  • US 9,465,080 B2
  • Filed: 12/26/2012
  • Issued: 10/11/2016
  • Est. Priority Date: 12/26/2012
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • measuring a terminal current and a terminal voltage of a group of cells contained in a battery, using a monitoring device;

    determining an excitation direction of the group of cells based on at least one of the terminal current and the terminal voltage;

    identifying a first change in the excitation direction of the group of cells;

    determining a first set of characteristics of the group of cells corresponding to the first change, wherein the first set of characteristics comprises a first voltage and a first current;

    identifying a second change in the excitation direction of the group of cells, wherein the second change in the excitation direction is opposite to the first change in the excitation direction;

    determining a second set of characteristics of the group of cells corresponding to the second change, wherein the second set of characteristics comprises a second voltage and a second current;

    determining a number of functional cells from the group of cells based on the first voltage, the first current, the second voltage and the second current;

    calculating a number of non-functional cells from the group of cells, based on the determined number of functional cells; and

    disconnecting the battery from an associated electrical load or from a power source that recharges the battery if the number of non-functional cells is greater than a fault threshold value.

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