Patent ID: 7504177
Filing Date: 2009-03-17
Classification: H01M

Abstract:
1. A reserve battery comprising: a liquid electrolyte; a case having a first compartment and a second compartment containing the liquid electrolyte; a plurality of cell electrodes positioned in said first compartment; a frangible barrier positioned inside said case, said frangible barrier separating said first compartment from said second compartment so that the liquid electrolyte in said second compartment is isolated from said first compartment; an elongate member having a first end, a second end proximate to said frangible barrier, and a fluid passageway extending from said first end to said second end, said fluid passageway in communication with an exterior of said case for transferring the liquid electrolyte from the exterior of said case to said second compartment for containment in the second compartment until the reserve battery is activated by a force applied to the case; and a rolling diaphragm connecting said first end of said elongate member with said case, said rolling diaphragm configured to yield in response to the force so that said second end of said elongate member is movable toward said frangible barrier to an extent sufficient to contact and rupture said frangible barrier.