| 摘要 |
785,526. Primary cells. DOW CHEMICAL CO. June 28,1956 [Aug. 8, 1955], No. 20104/56. Class 53. A primary cell comprises a steel cup 18 which forms a terminal electrode of the cell, a cylindrical magnesium anode 16 closely fitted within and having a welded connection as at 20 to the cup, a layer of oleaginous material 22 (e.g. grease or oil) between the anode 16 and the cup and a carbon cathode 12 which is insulated from the bottom of the cup and -which is surrounded by a depolarizing mix 14 of manganese dioxide and carbon black moistened with aqueous electrolyte. In the form shown, the bottom 26 of the cup is also coated with material 22 and the cathode 12 is insulated from the bottom by this layer and by the paper bag 24 containing the depolarizing mix. A seal 42 is formed between the cathode 12 and the cup by tar poured on to a paper washer 44, a tab 46 of which may be bent up to extend through the tar and form a gas vent. Alternatively the carbon cathode 12 may be porous to vent the gases from the cell. The weld 20 may be made before or after the material 22 is in position. The electrolyte used is of the type described in Specifications 659,367, 659,368 and 669,256, and the cup 18 may be given a coating 48 of insulating plastic. |
