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System and method for determining battery state-of-health

  • US 6,469,512 B2
  • Filed: 12/22/2000
  • Issued: 10/22/2002
  • Est. Priority Date: 01/12/2000
  • Status: Expired due to Term
First Claim
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1. A method for monitoring and displaying to user of a vehicle or a system on a real time basis the state of health (SOH) of a storage battery on which said vehicle or system relies, said method comprising the steps of:

  • measuring battery voltage and current under one of load and no load conditions for the battery;

    computing from the data of the measured battery voltage and current the battery internal resistance and polarization resistance;

    determining from said measured battery voltage and current and said computed battery internal resistance and polarization resistance the factors of battery state of change, cold cranking amperes, the presence of a shorted cell and the presence of a mismatched cell; and

    displaying to the user of said battery all of said determined factors.

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