Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1995-11-17
1997-11-04
Karlsen, Ernest F.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
324427, 324433, 340636, 320 48, G01N 2746
Patent
active
056844042
ABSTRACT:
A voltage gradient measurement device is provided for determining the remaining lifetime of a battery used to power a radio, pager, cellular telephone, or similar device. The battery is attached to a first circuit element to obtain a history of the battery voltage which is used to determine the differential battery voltage. The battery is also attached to a second circuit element which measures the voltage margin between the battery voltage and a reference voltage representing the battery end-of-life condition. A third circuit element divides the voltage margin output of the second circuit element by the differential battery voltage output of the first circuit element to estimate the time that will elapse until the battery voltage approximately equals the reference end-of-life voltage level. This time estimate is used as a basis for performing a variety of functions, including a trigger for a battery shut-off switch to protect radio circuits, and as an activator of indicators to warn the battery user of approaching battery safety thresholds. A method of estimating the remaining useful life of the battery is also disclosed.
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Do Diep
Karlsen Ernest F.
Maliszewski Gerald W.
Ripma David C.
Sharp Kabushiki Kaisha
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