Apparatus and method for detecting memory effect in...

G - Physics – 01 – R

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G01R 31/36 (2006.01)

Patent

CA 2343631

The invention provides for a timesaving method of determining whether a nickel cadmium (NiCd) battery (24) 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 (46) while continuously monitoring the battery terminal voltage (44). The maximum measured terminal voltage of the test battery (24) is compared to the measured terminal voltage (44) of an NiCd battery of the same nominal voltage and capacity and known not to have memory effect ("Normal" Battery). An NiCd battery (24) is determined to have memory effect if the maximum voltage of the test battery exceeds the maximum voltage of the normal battery.

La présente invention concerne un procédé, économisant du temps, permettant de déterminer si une batterie au nickel-cadmium (NiCd) (24) est touchée par un effet mémoire. Un batterie NiCd à pleine charge, en test (<= batterie test >=) est soumise à une rampe de courant de charge à pente positive, puis à une rampe de courant de charge à pente négative (46), tout en contrlant la tension aux bornes (44) de la batterie. La tension maximale mesurée aux bornes de la batterie test (24) est comparée à la tension aux bornes mesurée (44) d'une batterie NiCd de mêmes tension et capacité nominales ne présentant pas d'effet mémoire (batterie normale). Une batterie au NiCd (24) présente un effet mémoire si la tension maximale de la batterie test excède la tension maximale de la batterie normale.

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