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Rapid charge lithium ion battery charger

  • US 7,626,362 B2
  • Filed: 09/30/2005
  • Issued: 12/01/2009
  • Est. Priority Date: 09/30/2005
  • Status: Active Grant
First Claim
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1. A battery charging circuit for charging a lithium ion battery cell having a maximum recommended battery cell voltage, the battery charger comprising:

  • (a) a charging circuit for charging a battery cell configured with a constant current during a constant current mode of operation during which a first charging voltage and a constant current is supplied to said battery cell and a constant voltage mode of operation during which a constant second charging voltage is applied to said battery cell during a charging cycle, said charging circuit configured to intermittently sense the battery cell open circuit voltage when no current is flowing in the charging circuit and maintain said constant current mode of operation until said battery cell open circuit voltage reaches a predetermined value less than said maximum recommended battery cell voltage, said charging circuit further configured to switch to said constant voltage mode when said open circuit battery cell voltage reaches said predetermined value and thereafter reduce the charging voltage to said constant second charging voltage at or below the maximum recommended battery cell voltage.

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