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Method of and apparatus for measuring battery capacity by impedance spectrum analysis

  • US 6,208,147 B1
  • Filed: 03/02/1999
  • Issued: 03/27/2001
  • Est. Priority Date: 06/16/1998
  • Status: Expired due to Term
First Claim
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1. A method of measuring battery capacity by measurement and analysis of impedance spectrum, which is to measure a characteristic impedance spectrum of primary and secondary batteries and determine the battery capacity the method comprising the steps of:

  • (1) measuring the characteristic impedance spectrum of a battery in a predetermined frequency region;

    (2) determining one or more parameter from the measured impedance spectrum;

    (3) monitoring in advance the correlation between the determined model parameter and the battery capacity measured by a real-time discharge technique; and

    (4) determining the battery capacity from the characteristic impedance spectrum of a battery having an unknown capacity based on the monitored correlation.

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