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Method and apparatus for detecting cell voltage of battery pack

  • US 7,589,534 B2
  • Filed: 05/30/2006
  • Issued: 09/15/2009
  • Est. Priority Date: 05/27/2005
  • Status: Active Grant
First Claim
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1. method for detecting each voltage of multiple battery cells in a battery pack, in which each battery cell is connected through a conductive wire, the method comprising:

  • storing an impedance existing between voltage measuring points of each battery cell;

    detecting a current of the battery pack;

    multiplying the impedance of the conductive wire corresponding to each battery cell and the current to calculate a correction value of each battery cell;

    detecting a voltage of each battery cell; and

    correcting the voltage of each battery cell with respect to the correction value of each battery cell such that the voltage correction value corresponding to the voltage of each battery cell is subtracted during charging and the voltage correction value corresponding to the voltage of each battery cell is added during discharging.

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