Plastic sealing element for a galvanic primary cell
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United States of America Patent
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Sep 18, 1990
Grant Date -
N/A
app pub date -
Nov 14, 1988
filing date -
Dec 11, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A plastic sealing element for dry cells includes a radially symmetrical, centrally perforated base element, the upper side of which is provided with an elastomeric sealing material which is extruded in the form of a circumferential annular bead, and a process for its manufacture. After the sealing element is pre-assembled with the cell's metal housing cover and the cell is assembled, the annular bead is pressed flat during final crimping so that a sealing zone having a small cross section and defining a long leakage path is developed between the cover and the base element, effectively preventing the leakage of electrolyte or water vapor, which is especially diffuse from the cell's porous carbon rod conductor, into the cell's sealing zone.
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