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Secondary cell residual capacity calculation method and battery pack

  • US 20050024020A1
  • Filed: 07/23/2004
  • Published: 02/03/2005
  • Est. Priority Date: 07/29/2003
  • Status: Active Grant
First Claim
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1. A secondary cell residual capacity calculation method, comprising:

  • detecting a temperature of a plurality of secondary cells;

    detecting a current and a terminal voltage of each of the secondary cells;

    digitizing the temperature, the current, and the terminal voltage;

    calculating a cell polarization voltage from the digitized temperature, current and terminal voltage;

    calculating an original cell voltage from both of the calculated cell polarization voltage and the detected terminal voltage; and

    calculating a residual capacity rate based on the calculated original cell voltage with reference to a prearranged residual capacity reference data table.

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