Apparatus, system and method for charge balancing of individual batteries in a string of batteries using battery voltage and temperature, and detecting and preventing thermal runaway

  • US 9,537,332 B2
  • Filed: 05/30/2014
  • Issued: 01/03/2017
  • Est. Priority Date: 05/30/2013
  • Status: Active Grant
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First Claim
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1. A method of load balancing comprising:

  • measuring a first voltage and a first temperature of a first battery in a string of batteries;

    measuring a second voltage and a second temperature of a second battery in the string of batteries;

    setting a first target voltage based on a first nominal battery voltage associated with the first temperature;

    setting a second target voltage based on a second nominal battery voltage associated with the second temperature;

    controlling a first current to the first battery to;

    maintain the first voltage when the first voltage is at the first target voltage;

    increase the first voltage when the first voltage is below the first target voltage; and

    decrease the first voltage when the first voltage is above the first target voltage; and

    controlling a second current to the second battery to;

    maintain the second voltage when the second voltage is at the second target voltage;

    increase the second voltage when the second voltage is below the second target voltage; and

    decrease the second voltage when the second voltage is above the second target voltage.

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