| 摘要 |
879,509. Batteries. YARDNEY INTERNATIONAL CORPORATION. Feb. 24, 1958 [Feb. 23, 1957], No. 5956/58. Class 53. To prevent growths of active material extending from one electrode to another, and to aid the solution of such growths a cell is provided with a permeable metal plate between the electrodes but out of contact therewith, the plate having a lower overvoltage than one or both of the electrodes. The plate may be made of silver, gold or other noble metals or of iron, nickel, or nickel cobalt alloys, and it may be in the form of mesh, woven or knitted fabric, expanded metal or perforated metal sheets. Alternatively it may consist of porous sintered or sprayed metal either self-supporting or attached to a permeable support. The metal may also be plated.on the battery separator or attached thereto in powder form, or precipitated by ehemical processes or vacuum sublimation. In another modification the metal is dispersed in polyvinyl alcohol, viscose solutions or other film-forming medium which is then spread on a support. The barrier plate may be used in lead acid cells, zinc silver alkaline cells and zinc nickel cells. Fig. 3 shows a cell in which the electrodes 21, 23 are provided with electrolyte distributing wicks 25 and separators 26. A metal barrier plate 27 is inserted between the separators. Fig. 4 shows a cell in which the barrier metal 36 is coated on the separator 37 or on the wick 35. |
