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Method for monitoring battery discharge by determining the second derivative of battery voltage over time

  • US 5,278,509 A
  • Filed: 02/03/1992
  • Issued: 01/11/1994
  • Est. Priority Date: 02/03/1992
  • Status: Expired due to Term
First Claim
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1. A method for monitoring the state of charge of a battery undergoing discharge in an electronic system, comprising the steps of:

  • monitoring the rate of change of battery voltage (dv/dt) over time;

    establishing the rate at which dv/dt for the battery changes;

    determining from the rate at which dv/dt for the battery changes, the time interval before dv/dt reaches a prescribed level corresponding to a critical value of battery charge; and

    cutting off battery discharge, at the end of said time interval, when the value of dv/dt reaches the level corresponding to a critical value of battery charge.

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