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Charged State Estimating Device and Charged State Estimating Method of Secondary Battery

  • US 20090001992A1
  • Filed: 11/30/2006
  • Published: 01/01/2009
  • Est. Priority Date: 12/27/2005
  • Status: Active Grant
First Claim
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1. A device for estimating charged state of a secondary battery provided with a detector capable of detecting input/output current, an output voltage and battery temperature, comprising:

  • characteristic storing means for storing characteristic between open circuit voltage and remaining capacity of said secondary battery;

    stable state determining means for determining whether it is a stable state in which said input/output current is maintained not higher than a limit current set in accordance with said battery temperature for at least a voltage stabilizing period set in accordance with said battery temperature or not; and

    first charged state estimating means for estimating the remaining capacity of said secondary battery based on the characteristic stored in said characteristic storing means, regarding said output voltage as said open circuit voltage, when it is determined to be said stable state.

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