| 摘要 |
1351253 Rechargeable cell MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 19 April 1971 [2 Feb 1970] 20939/71 Heading H1B A rechargeable alkaline manganese cell comprises a positive manganese dioxide electrode 22, a zinc negative electrode 24, a non-woven fabric separator 23 between the electrodes and an alkaline electrolyte, the zinc electrode having a discharge capacity of less than 60% of the theoretical capacity of the positive electrode. The zinc electrode is formed from zinc compounds amalgamated with short purified cotton strands in an aqueous solution of polyvinyl alcohol which are pasted and dried onto a copper net. The manganese dioxide electrode includes graphite, acetylene black or carbonyl nickel powder. The separator is formed by alkali resistant hydrophilic cotton fibres which have been treated with caustic alkali to disolve impurities. Polyvinyl alcohol is used as a binder or may be additionally combined with the hydrophilic cotton. The thickness of the separator material is 0À5-4À0 mm. and the zinc electrode not more than 3 mm. The cell additionally comprises a nickel plated steel sheet electrode can 21, a seal 27 of polyethylene, an inner plate 28 having a gas vent 29, and a spring 33 between the conductor 30 and the outer terminal plate 34. Electrolyte impregnating material 26 comprising alkali resistant cotton fibres supported in a cylindrical synthetic resin tube 25 (e.g. polyvinyl chloride) is provided along with a further polyvinyl chloride tube 35 and packing 36. A second embodiment discloses a double manganese dioxide electrode separated by the zinc electrode (Fig. 2, not shown). The electrodes may be gel-type or moulded electrodes. Reference has been directed by the Comptroller to Specification 1,240,287. |
