Battery capacity indicator

G - Physics – 01 – R

Patent

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Details

G01R 31/36 (2006.01)

Patent

CA 2180475

This invention is a battery monitor and battery capacity indica- tor that uses a sense cell (22) in ad- dition to the main battery (10) to de- termine main battery remaining ca- pacity and depletion condition. A parameter of the sense cell is related to the main battery capacity so that the main battery will have a mini- mum capacity remaining when the sense cell parameter reaches a par- ticular value or crosses a particular threshold. In a preferred embodi- ment, the sense cell (22) is a battery which is identical and of the same manufacturing lot as the battery cell or cells (20) in the main battery pack (10). A current is drawn from the sense cell that is larger than the current being drawn from the main battery. When the sense cell (22) is fully depleted, the main battery (10) will have a remaining capacity whose magnitude depends on the re- lationship between the main battery current and the sense cell current.

L'invention concerne un dispositif de surveillance de batterie et d'indication de capacité de batterie, qui comprend, en plus de la batterie principale (10), un élément capteur (22) servant à déterminer la capacité restante de la batterie et son état de décharge. Un paramètre de l'élément capteur est associé à la capacité de la batterie principale de sorte que celle-ci conserve une capacité restante minimum lorsque le paramètre de l'élément capteur atteint une valeur particulière ou passe par un certain seuil. Dans un mode de réalisation préféré, l'élément capteur (22) est une batterie qui est identique et fait partie du même lot de fabrication que l'élément ou les éléments (20) de la batterie principale (10). Un courant est tiré de l'élément capteur, ce courant étant plus important que le courant tiré de la batterie principale. Lorsque l'élément capteur (22) est complètement déchargé, la batterie principale (10) a une capacité restante dont l'amplitude dépend de la relation entre le courant de la batterie principale et le courant de l'élément capteur.

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