Alkaline battery sealing gasket and sealed alkaline battery

Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Cell enclosure structure – e.g. – housing – casing – container,...

Reexamination Certificate

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Details

C428S043000

Reexamination Certificate

active

07144656

ABSTRACT:
An alkaline battery sealing gasket33made of a resin, comprises a peripheral packing portion36sandwiched in a pressed state between an opening end of a metal battery can11that contains an electricity generating element20and doubles as a positive electrode terminal and a negative electrode terminal32so as to seal the opening end with an airtight manner; and an isolation wall portion37for isolating a space on a back side of the negative electrode terminal from a space containing the electricity generating element, wherein in the isolation wall portion, a thinner portion38to break open earlier due to increases in gas pressure in the containing space to function as a safety valve is formed groove-like. A groove direction of the thinner portion38is in the same direction as an orientation of the resin of the gasket, and an Izod impact value of the resin forming the gasket is in a range of 20 to 60 J/m (at a temperature of 23±2° C. and a relative humidity of 50±5%).

REFERENCES:
patent: 56-132765 (1981-10-01), None
patent: 61-133552 (1986-06-01), None
patent: 63-166140 (1988-07-01), None
patent: 2-201865 (1990-08-01), None
patent: 7-105925 (1995-04-01), None
patent: 2002-251987 (2002-09-01), None

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