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Methods and apparatus for estimating a state of health of a battery

  • US 10,345,392 B2
  • Filed: 11/18/2016
  • Issued: 07/09/2019
  • Est. Priority Date: 11/18/2016
  • Status: Expired due to Fees
First Claim
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1. An apparatus for estimating a state of health of a battery, comprising:

  • a voltage sensor responsive to an output voltage of the battery;

    a current sensor responsive to a current of the battery;

    a secondary current circuit coupled to the current sensor and comprising;

    a first transistor and a second transistor coupled in parallel; and

    a voltage source circuit to selectively operate the first and second transistors by applying a predetermined constant voltage to each of the first and second transistors; and

    a logic unit responsive to the voltage sensor and the current sensor, wherein the logic unit is configured to;

    determine a baseline internal resistance of the battery;

    calculate an aged internal resistance of the battery based on the current and the output voltage; and

    estimate the state of health of the battery based on the baseline internal resistance and the aged internal resistance.

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