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Fuel Cells

State-of-charge-battery-monitor

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State of charge battery monitor

Details

Inventors: Peterson, Francis C.;
Assignee: Illinois Tool Works Inc. (Chicago, IL)
Primary Examiner: Smith; Robert I.
Assistant Examiner:
Attorney, Agent or Firm: Forsberg; Jerold M., Buckman; T. W.

There is disclosed a monitor for monitoring the state of charge of a battery having an internal charge transfer medium. A monitor includes detecting means arranged to be disposed beneath the surface of the charge transfer medium and arranged for sensing the specific gravity of a fluid medium, enclosure means for enclosing the detecting means, and a fluid medium within the enclosure means. The fluid medium exhibits specific gravities related to the degree of electric charge therein and the enclosure means is formed at least partly from a non-permeable electric charge transmissible material to enable the fluid medium to assume the electric charge of the charge transfer medium while substantially separating the fluid medium therefrom. The monitor further includes indicating means responsive to the detecting means for indicating the specific gravity of the fluid medium and thus the state of charge of the battery.

DETAILED DESCRIPTION The present invention provides a monitor for monitoring the state of charge of a battery having an internal charge transfer medium.
The monitor comprises detecting means arranged to be disposed beneath the surface of the charge transfer medium and arranged for sensing the specific gravity of a fluid medium, enclosure means for enclosing the detecting means, and a fluid medium within the enclosure means.
The fluid medium exhibits specific gravities related to the degree of electric charge therein and the enclosure means is formed at least partially from a non-permeable electric charge transmissible material to enable the fluid medium to assume the electric charge of the charge transfer medium while substantially separating the fluid medium therefrom.
The monitor further includes indicating means responsive to the detecting means for indicating the specific gravity of the fluid medium and thus the state of charge of the battery.

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