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Method and device for monitoring and for dynamically balancing a storage battery pack

  • US 5,644,209 A
  • Filed: 07/24/1995
  • Issued: 07/01/1997
  • Est. Priority Date: 11/23/1993
  • Status: Expired due to Fees
First Claim
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1. A method of monitoring the state of all individual batteries in a battery pack made up of a plurality of said individual batteries connected in series, said method comprising the steps of:

  • monitoring voltage at terminals of each of said batteries and monitoring the temperature of each of said batteries;

    tapping off at least a portion of charging current of individual ones of said batteries and dissipating said at least part of the charging current outside said ones of said batteries when at least one of a voltage at terminals of said ones of said batteries and the temperature of said ones of said batteries indicate a state of overcharge;

    monitoring, during a charging and discharging mode, the rate of change of voltage at terminals of each of said batteries and monitoring the temperature of each of said batteries in order to detect imbalance between said plurality of batteries in said pack; and

    when an imbalance is detected, providing at least one of a recording of said imbalance and a triggering of an alarm.

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