GB299591A - Improvements in and relating to galvanic cells - Google Patents

Abstract

299,591. P÷rscke, P. July 8, 1927. Cases; cells; connections; electrodes; gas exits.-Porous electrodes are made bv mixing metals and metallic oxides with an acid or base so that local galvanic action occurs whereby one or more of the constituents separate out leaving a porous remainder. For example 100 parts of cobalt oxide are mixed with 40 parts of zinc powder and 10 parts by weight of a 40 per cent solution of caustic soda are added while stirring. The mass is spread on a perforated metal supporting plate and heated to 70‹ C. for 10 hours. Powdered metal not affected by the above process may be added to the material to increase conductivity. The supporting plate may be corrugated or plain, and the perforations may have. burred edges, or expanded metal may be used. Fig. 2 shows the mass 26 on a plate 27 with lugs 28 adapted to pass through slots in frame members 30 and be bent over. Lugs 29 are also provided for connections. Instead of being applied to supporting plates the material may be moulded to suitable forms, such as a helix of square, circular, channelled, or other cross-section. Fig. 11 shows strip material with the faces of the strip parallel to the axis of the helix. The faces may be perpendicular or inclined to the axis. A number of plates may be combined to form an electrode Fig. 7 shows in plan plates having lugs 33 inserted in slots in transverse supports 35 and clamped by bolts 37. In assembling electrodes to form a cell or battery, Figs. 9, 10, one set of electrodes 41 is supported by rods' 46 passing through and secured to the cover 47, and the other set 26 issupported by a frame 43 between pacliing rings 48 and clamped between the cover 47 and the rim of the cell 38 by clips 51 engaging an undercut flange on the cell and a depression in the cover. The electrode supports may have terminals 55 and one or both of the clips may have terminals 53, the necessary connections being made by conductor 54. As an alternative the electrodes carried by the lid may have blade connectors 75 engaging slots in connecting posts 76 of the electrodes carried by the frame. The lid may have a thin portion 56 which can be perforated by a pin to provide a gas exit. The Specification also describes various forms of metal cells and cases enamelled inside and out. Posts 61 may be provided upstanding from the bottoms of the cells or from plates secured therein by enamel, the posts being enamelled except at their upper ends which are threaded, to serve as supports for electrodes and as conductors. In assembling cells to form a battery a number of cells 58, 59, 60, seen in plan, Fig. 20, may be connected by channel clips 63 embracing flanges on the cells, the spaces between being filled with enamel. Alternatively, a number of enamelled cells may be assembled in an enamelled case, and secured therein by enamel poured into the spaces between cells and case, and then stoved.