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Apparatus and method for estimating internal resistance of battery

  • US 9,846,195 B2
  • Filed: 11/20/2012
  • Issued: 12/19/2017
  • Est. Priority Date: 11/24/2011
  • Status: Active Grant
First Claim
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1. An apparatus for estimating internal resistance of a battery pack, comprising:

  • a voltage sensing unit that measures a voltage value of the battery pack;

    a current sensing unit that measures a current value of the battery pack;

    a temperature sensing unit that measures a temperature value of the battery pack;

    at least one microcontroller on a single integrated circuit comprising a processor, memory, and programmable input/output peripherals, the processor programmed to comprise;

    (a) a condition initializing unit that initializes a current value measured in advance in the current sensing unit, a current, and a voltage;

    (b) a temperature measuring unit that stores the current value received from the current sensing unit, the voltage value received from the voltage sensing unit, and the temperature value received from the temperature sensing unit, in an arbitrarily set variable;

    (c) a current condition judging unit that judges whether the current value measured in the current sensing unit satisfies a preset current value condition;

    (d) a current value, voltage value, and temperature value storing unit that extracts and stores in the memory a current value in the case in which the current value measured in the current sensing unit satisfies the preset current value condition according to the judgment of the current condition judging unit and stores the voltage value and temperature value measured together with the current value at the time of the measurement of the current value;

    (e) estimating the internal resistance of the battery pack, wherein the processor repeats a process of extracting and storing the current value satisfying the preset current value condition according to the judgment of the current condition judging unit and storing the voltage value and temperature value measured together with the current value at the time of the measurement of the current value two times or more and then calculates the internal resistance of the battery pack using the current value, the voltage value, and the temperature value stored in the current value, voltage value, and temperature value storing unit; and

    (f) comparing, for at least two internal resistance points, temperatures to determine the effect of temperature on internal resistance of the battery; and

    a battery management system for use with a vehicle controller, predicting a replacement time of the battery pack, servicing, or for diagnosing and controlling the battery pack'"'"'s state based on the estimated internal resistance of the battery.

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