Method and system for charging multi-cell lithium-based batteries

  • US 7,262,580 B2
  • Filed: 12/30/2005
  • Issued: 08/28/2007
  • Est. Priority Date: 11/22/2002
  • Status: Active Grant
First Claim
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1. A battery charger comprising:

  • at least one terminal to electrically connect to a lithium-based chemistry battery pack, the battery pack having a nominal voltage and including a plurality of lithium-based battery cells, each battery cell of the plurality of battery cells having an individual state of charge; and

    a controller operable to provide pulses of constant charging current to the battery pack though the at least one terminal, wherein the length of the pulses and the time between the pulses are based at least in part on the individual state of charge of at least one battery cell of the battery pack.

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