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Apparatus and method for charging a battery pack

  • US 9,172,253 B2
  • Filed: 12/07/2010
  • Issued: 10/27/2015
  • Est. Priority Date: 12/28/2009
  • Status: Active Grant
First Claim
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1. An apparatus for charging a battery pack, comprising:

  • a voltage sensing unit to sense an output voltage of the battery pack charged with a predetermined voltage for a first period;

    a controller to determine a number of cells in the battery pack in accordance with the sensed output voltage; and

    a power source charge and discharge unit to supply the predetermined voltage to the battery pack for the first period and to supply a charge voltage to the battery pack for a second period, after the controller has determined the number of cells in the battery pack, the charge voltage being determined in accordance with the number of cells in the battery pack, whereinthe predetermined voltage is set with a constant voltage regardless of the number of cells in the battery pack for the first period, and the charge voltage is changed according to the number of cells in the battery for the second period.

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