System and method for determining and balancing state of charge among series connected electrical energy storage units
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United States of America Patent
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Mar 20, 2007
Grant Date -
Jul 15, 2004
app pub date -
Nov 19, 2003
filing date -
Nov 25, 2002
priority date (Note) -
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Abstract
A system and method for determining and balancing state of charge among plural series connected electrical energy storage units is provided. State of change of a selected storage unit in a string of storage units is determined by (i) applying a non-dissipative load to the selected storage unit, resulting in an energy transfer between the selected storage unit and the string of electrical energy storage units through the non-dissipative load and (ii) determining the state of charge of the selected unit from voltage and current data of the selected storage unit resulting from the energy transfer. When the state of charge of the selected unit is different than a target state of charge, energy can be transferred between the selected unit and 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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