Automatic rechargeable battery monitoring system

  • US 5,325,041 A
  • Filed: 01/21/1993
  • Issued: 06/28/1994
  • Est. Priority Date: 08/09/1991
  • Status: Expired due to Fees
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First Claim
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1. A method for monitoring and indicating the charge state of a rechargeable battery, said method comprising the steps of:

  • sampling current into and out of said battery at repeated intervals,sampling a voltage across a pair of terminals of said battery to sense when said voltage reaches a predetermined level,integrating the sampled current from a charge value to a discharge value,repeating the steps of current sampling and current integration, and calculating a present level of battery charge from either a full charged state to a present charge state or a fully discharged state to said present state,calculating a total discharge capacity of said battery based on said integration each time said battery reaches said fully discharged state, such that said total discharge capacity comprises an approximation of a true total discharge capacity of said battery,comparing said present level of battery charge to said calculated total discharge capacity, anddisplaying said present level of battery charge as a function of said total discharge capacity.

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