Metal-air battery with an extended service life
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United States of America Patent
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Aug 10, 2004
Grant Date -
Oct 2, 2003
app pub date -
Mar 26, 2002
filing date -
Mar 26, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A battery comprising a control means and a plurality of metal-air cell assemblies that are electronically connected in parallel. Each cell assembly comprises a casing with a controllable air vent thereon and at least a metal-air cell inside the casing. The controllable air vent is closed during a battery storage period and is opened in response to a programmed signal in order to allow outside air or oxygen to enter the assembly through the air vent to activate the operation of the corresponding cell assembly. The control means, preferably including a sampling unit, a power control unit and a logic control unit, is capable of sensing the battery output voltage and sending programmed signals to open or close up the air vents at the same time or at different moments of time in a programmed fashion.
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