Sealed alkaline battery cells with excess gas pressure release

Claim 1

IN A SEALED RECHARGEABLE BATTERY CELL; AN ELECTRODE ASSEMBLY OF AT LEAST TWO OPPOSITE-POLARITY ELECTRODES AND ASSOCIATED ELECTROLYTE WHICH DEVELOP GAS PRESSURE WHEN CHARGED, A SEALED ENCLOSURE COMPRISING A STRONG TUBULAR METALLIC CASING AND A STONG METALLIC COVER SHEET ENCLOSING SAID ASSEMBLY AND CONNECTED TO SAID TWO ELECTRODES, RESPCTIVELY, SAID COVER SHEET HAVING A PERIPHERALS COVER RIM AFFIXED TO THE SURROUNDING TUBULAR CASING JUUNCTION REGION NEAR THE OPEN CASING END OF SAID TUBULAR CASING, SAID COVER SHEET HAVING A VENT OPENING SPACED FROM ITS RIM AND A STRONG TOOTH WITH A SHARP END PROJECTING TOWARD THE CASING INTERIOR, A THIN FLEXIBLE METALLIC DIAPHRAGM UNDERLYING THE ENTIRE INTERIOR SURFACE OF SAID COVER SHEET FOR FLEXURE AGAINST AND BEING PUNCTUURED BY SAID TOOTH BY GAS PRESSURES WITHIN SAID ENCLOSURE, SAID DIAPHRAGM HAVING A RIM SURROUNDING AND OVERLAPPING A SUBSTANTIAL EXTERIOR RADIAL RIM AREA OF SAID COVER RIM. A CONTINUOUS PLASTIC INSULATING COLLAR SURROUNDING SAID COVER RIM AND HAVING INNER AND OUTER COLLAR FLANGES OVERLAPPING SUBSTANTIAL INTERIOR AND EXTERIOR RADIAL RIM AREAS OF SAID COVER RIM, SAID TUBULAR CASING JUNCTION REGION HAVING A DOUBLEWALL INWARD CASING PROJECTION UNDERLYING THE INTERIOR RIM AREA OF SAID COVER RIM WITH ITS SAID OVERLAPPING DIAPHRAGM AND COLLAR FLANGES, THE OPEN END SECTION OF SAID TUBULAR CASING JUNCTION REGION BEING INWARDLY TURNED AND HOLDING CLAMPED SAID PLASTIC COLLAR WITH COMPRESSION FORCES TOWARD THE EDGE OF SAID COVER RIM AND WITH AXIAL COMPRESSION FORCES TOWARD SAID INWARD CASING PROJECTION AND CONFINING THEREWITH SAID INNER AND OUTER COLLAR FLANGES AND THE EMBRACED COVERSHEET AND DIAPHRAGM RIM UNDER GAS-TIGHT COMPRESSION SEALING ENGAGEMENT, SAID DIAPHRAGM HAVING SUFFICIENT STRENTH TO RESIST EXCESSIVE DEFORMATION UNDER NORMAL INTERNAL GAS PRESSURE AND BEING DEFORMED INTO PUNCTURE ENGAGEMENT WITH SAID COVER TOOTH UNDER PREDETERMINED RAISED INTERNAL GAS PRESSURE.