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Internal resistance estimation method for secondary battery, output control method for secondary battery, and vehicle

  • US 10,046,664 B2
  • Filed: 06/23/2016
  • Issued: 08/14/2018
  • Est. Priority Date: 06/25/2015
  • Status: Active Grant
First Claim
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1. An output control and internal resistance estimation method for a secondary battery, the internal resistance estimation method being a method of estimating an internal resistance value of the secondary battery including a positive electrode and a negative electrode, comprising:

  • acquiring an initial internal resistance value of the secondary battery;

    monitoring the secondary battery to acquire temperature course information, the temperature course information including a battery temperature of the secondary battery at least during use of the secondary battery and time information about time at which the battery temperature has been recorded;

    periodically acquiring and storing the temperature course information;

    repetitively estimating an increased amount of the internal resistance value of the secondary battery, after a lapse of a predetermined time, on the basis of the stored temperature course information;

    repetitively estimating a reduced amount of the internal resistance value of the secondary battery resulting from a relative change between a range of use of a state of charge of the positive electrode and a range of use of a state of charge of the negative electrode, after the lapse of the predetermined time, on the basis of the stored temperature course information;

    repetitively calculating an internal resistance variation in the lapse of the predetermined time, on the basis of the increased amount and the reduced amount of the internal resistance value; and

    adjusting an output of the secondary battery, based on the internal resistance variation.

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