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Rapid charge lithium ion battery charger

  • US 7,898,220 B2
  • Filed: 09/25/2009
  • Issued: 03/01/2011
  • Est. Priority Date: 09/30/2005
  • Status: Expired due to Fees
First Claim
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1. A method for charging a battery by way of a battery charger, the battery and battery charger forming a battery charging circuit, the method comprising steps of:

  • (a) selecting a constant charging current to charge the battery based upon one or more predetermined design considerations;

    (b) charging the battery at said constant charging current during a constant current mode of charging;

    (c) repeatedly monitoring the battery open circuit voltage;

    (d) switching to a constant voltage mode of charging when said battery open circuit voltage reaches a predetermined voltage value;

    (e) charging said battery with a constant voltage after said battery open circuit voltage reaches said predetermined value;

    (f) monitoring the charging current in said constant voltage mode; and

    (g) terminating charging when said charging current drops below a predetermined current value.

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