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State of charge calculation device and state of charge calculation method

  • US 6,845,332 B2
  • Filed: 10/31/2002
  • Issued: 01/18/2005
  • Est. Priority Date: 11/16/2001
  • Status: Expired due to Term
First Claim
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1. A state of charge calculation device that calculates a state of charge of a battery connected to a load, comprising:

  • a current detection portion that detects discharge current of a battery; and

    a voltage detection portion that detects a voltage of the battery; and

    a controller for calculating a first state of charge estimate by integrating the detected discharge current, and correcting the first state of charge estimate using an electromotive voltage correction parameter, that is determined using an electromotive voltage based on the detected voltage, wherein the controller determines a second state of charge estimate based on the electromotive voltage, determines a correction amount based on a difference between the first state of charge estimate and the second state of charge estimate using the electromotive voltage correction parameter, and corrects the second state of charge estimate using the correction amount.

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