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Method for charging a lithium ion battery by increasing a charge limit voltage to compensate for internal battery voltage drop

  • US 9,054,396 B2
  • Filed: 07/02/2009
  • Issued: 06/09/2015
  • Est. Priority Date: 09/28/2008
  • Status: Active Grant
First Claim
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1. A method for charging a lithium ion battery comprising the steps of:

  • charging the lithium ion battery only at a constant current; and

    stopping the charging of the lithium ion battery when the lithium ion battery is charged to a charge limit voltage U at the constant current, characterized in that the charge limit voltage between two poles of the lithium ion battery is set to be U=U0+(U0

    Us)=2U0

    Us, whereinU0 is a standard charge cutoff voltage of the lithium battery used by a low rate constant current-constant voltage charging mode;

    Us is a stabilized voltage to which an oven-circuit voltage of the lithium ion battery falls back after the voltage of the lithium ion battery is charged to U0 at the constant current.

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