| 摘要 |
1,207,944. Dry cell. UNION CARBIDE CORP. 18 Feb., 1969 [19 Feb., 1968], No. 8694/69. Heading H1B. Gas venting means for a dry cell, particularly a Mg.-dry cell, comprises an aperture 13 in the annular raised portion 8 of an insulating closure disc 7 which is mounted in the open end of a cylindrical cupped container-anode 2. A flat annular seal gasket 14 is urged into resilient sealing pressure contact with the top portion of the closure disc 8 around the aperture 13 by one leg 11b of an L-section seal ring 11 which is mounted over the upper peripheral edge of the container 2. The other leg 11a is in radial pressure contact with the exterior side wall of the container 2 and forms a tight radial seal between the abutting outer edges of disc 7 and the interior side wall of container 2. The aperture preferably terminates in an enlarged circular recess or elliptically shaped recess or may communicate with a circumferential groove in the top surface of the closure disc. When the gas pressure in the cell reaches a certain level the pressure applied through aperture 13 against the underside of gasket 14 plus that applied to the bottom of disc 7 forces leg 11b to deflect away from gasket 14, which returns to its initial position after the gas pressure has been released. The usual central carbon cathode rod embedded in a MnO 2 depolarizer mix is provided in the cell. |
