Apparatus and method for detecting memory effect in nickel cadmi

Electricity: measuring and testing – Electrolyte properties – Using a battery testing device

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324433, G01N 2746

Patent

active

060940514

ABSTRACT:
The invention provides for a timesaving method of determining whether a nickel cadmium (NiCd) battery is stricken with memory effect. A fully charged NiCd battery under test ("test battery") is subjected to a positive sloped current charge ramp and then a negative sloped current charge ramp while continuously monitoring the battery terminal voltage. The maximum measured terminal voltage of the test battery is compared to the measured terminal voltage of a NiCd battery of the same nominal voltage and capacity and known not to have memory effect ("normal"battery). A NiCd battery is determined to have memory effect if the maximum voltage of the test battery exceeds the maximum voltage of the normal battery.

REFERENCES:
patent: 3921064 (1975-11-01), Mori et al.
patent: 4433294 (1984-02-01), Windebank
patent: 4560937 (1985-12-01), Finge
patent: 5869969 (1999-02-01), Cividino et al.
patent: 5962008 (1999-07-01), Palanisamy et al.

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