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Method and system for cell equalization using state of charge

  • US 7,525,285 B2
  • Filed: 11/11/2004
  • Issued: 04/28/2009
  • Est. Priority Date: 11/11/2004
  • Status: Active Grant
First Claim
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1. A method for cell equalization in battery packs, comprising:

  • determining a state-of-charge for each cell of a plurality of cells;

    determininga charge capacity performed byi) calculating a difference between a selected maximum state-of-charge for said each cell and a present state-of-charge for said each cell,ii) multiplying said difference by a total capacity for each said cell or by a nominal capacity for said each cell, andiii) employing a Coulombic efficiency calculation; and

    equalizing one or more cells of said plurality of cells, when the charge capacity of at least one cell of said plurality of cells is lower than a charge capacity of an other cell of said plurality of cells by a selected threshold.

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