Battery gasket and alkaline battery using the same
AssigneePanasonic Corporation
InventorsIchiro Matsuhisa, Susumu Kato
Life of this patent
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Abstract
A gasket is made of an injection molded resin integral with a cylindrical boss portion having a through hole in which a current collector is inserted, a rim portion for sealing an opening of a battery case, and a connecting portion for connecting the boss portion and the rim portion, wherein the boss portion has an annular injection portion at an end face thereof, which is a trace of an injection molding gate, a ratio (S1/S2) between an axial cross-sectional area (S1) of the boss portion and an axial cross-sectional area (S2) of the injection portion is in the range of 10 to 25, and an outer diameter of the boss portion is in the range of 3.0 to 4.2 mm.
Claims8
A battery gasket for sealing an opening of a battery case of a cylindrical alkaline battery, the battery gasket comprising:
- an injection-molded resin integral with a cylindrical boss portion having a through hole in which a current collector is inserted,
- a rim portion for sealing the opening of the battery case, and
- a connecting portion for connecting the boss portion and the rim portion, wherein
- the boss portion has an annular injection portion at an end face thereof, which is a trace of an injection molding gate,
- a ratio (S1/S2) between an axial cross-sectional area (S1) of the boss portion and an axial cross-sectional area (S2) of the injection portion is in the range of 10 to 25, and
- an outer diameter of the boss portion is in the range of 3.0 to 4.2 mm.
Dependencies are inferred from the claim text.