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Battery pack voltage detection apparatus

  • US 6,803,766 B2
  • Filed: 09/18/2002
  • Issued: 10/12/2004
  • Est. Priority Date: 03/27/2001
  • Status: Active Grant
First Claim
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1. A battery pack voltage detection apparatus for detecting a voltage of a battery pack having first and second battery blocks connected in series, each battery block including a plurality of battery cells connected in series, the battery pack voltage detection apparatus comprising:

  • a voltage detection circuit;

    a series capacitor circuit including a plurality of capacitors connected in series, the number of which is equal to the number of cells of the battery block;

    an input analog switch group that connects a terminal of each cell of the first battery block to a terminal of each capacitor individually so that each capacitor is charged by each cell of the first battery block individually, and that connects a terminal of each cell of the second battery block located on a low potential side with respect to the first battery block to a terminal of each capacitor in a potentially reverse order to the terminal of the first battery block; and

    an output analog switch group that connects the terminal of each capacitor to the input terminal of the voltage detection circuit separately.

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