| 摘要 |
PURPOSE:To reduce the impedance and enhance the preservation characteristic of an alkaline battery by using a separator prepared by laminating and unifying cellophane films and specified polyethylene films, and locating one of the polyethylene films so that it touches the positive mixture. CONSTITUTION:After a positive mixture 2 is packed in a metal case 1, a separator 3, an electrolyte holding material 4 and a gel-like negative agent 5 are stacked over the mixture 2, in that order. Next, a sealing metal plate 7 is placed on the agent 5, with an insulating gasket 6 interposed between the case 1 and the plate 7, to seal the battery, thereby constituting a thin alkaline battery. The separator 3 is formed by laminating a first polyethylene film 31 which is prepared by subjecting acrylic acid or methacrylic acid to graft-polymerization and has a small graft rate, a first cellophane film 32, a second polyethylene film 33 which is prepared in the same way as the film 31 and has a larger graft rate than the film 31, and a second cellophane film 34. It is preferred that the graft rate of the first film 31 is 20-40%, while that of the second film 33 is 45-90%. The film 31 is located on the side of the positive mixture 2. |
