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BATTERY CONTROL APPARATUS, ELECTRIC VEHICLE, AND COMPUTER-READABLE MEDIUM STORING A PROGRAM THAT CAUSES A COMPUTER TO EXECUTE PROCESSING FOR ESTIMATING A STATE OF CHARGE OF A SECONDARY BATTERY

  • US 20080053715A1
  • Filed: 08/31/2007
  • Published: 03/06/2008
  • Est. Priority Date: 09/05/2006
  • Status: Active Grant
First Claim
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1. A battery control apparatus comprising:

  • a determination unit configured to determine whether a secondary battery generates a polarization voltage in response to an initiation of power supply from the secondary battery to a load; and

    a state-of-charge estimating unit configured to estimate a present state of charge indicating a state of charge of the secondary battery immediately after initiating power supply, if the determination unit determines that the secondary battery generates no polarization voltage,wherein the state-of-charge estimating unit calculates the present state of charge based on a peak battery voltage drop Δ

    Vs and a peak discharge current Is, wherein the peak battery voltage drop Δ

    Vs represents a difference between a battery voltage Vo measured before initiating power supply and a lowest battery voltage Vs measured after initiating power supply and the peak discharge current Is represents a maximum current value measured after initiating power supply,wherein the state-of-charge estimating unit sets an initial value based on the estimated present state of charge and estimates a state of charge of the secondary battery based on the initial value as a value effective immediately after initiating power supply.

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