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System and method for balancing state of charge among series-connected electrical energy storage units

  • US 20040135546A1
  • Filed: 11/19/2003
  • Published: 07/15/2004
  • Est. Priority Date: 11/25/2002
  • Status: Active Grant
First Claim
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1. A system for balancing state of charge among plural series connected electrical energy storage units, comprising:

  • a string of electrical energy storage units, each storage unit having a state of charge;

    a circuit selectively monitoring the state of charge of each storage unit; and

    when the state of charge of a selected unit is greater than a target state of charge, the circuit transferring energy from the selected unit to the string of storage units, such that the state of charge of the selected unit converges toward the target state of charge.

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