ZYLINDRISCHES ELEKTROMECHANISCHES ELEMENT

1376807 Primary cells SAFT-SOC DES ACCUMULATEURS FIXES ET DE TRACTION 17 Nov 1972 [26 Nov 1971] 53374/72 Heading H1B A cell comprises a metal casing 3 in contact with a porous positive electrode 4 consisting of a compressed mixture of, e.g. powdered copper oxide, graphite, and a binder. A tubular sheet separator 5 applied against the electrode 4 is contacted on its inner surface by a negative electrode 6, e.g. of lithium. The electrode 6 is in the form of a sheet surrounding a tubular collector 7 of spring steel. The longitudinal edges of the collector 7 overlap, Fig. 2, and are not connected whereby the resilience of the collector, which tends to expand it, holds the components 3 .. 7 in contact with each other. In a modification, (Fig. 3, not shown), the collector edges do not overlap but are spaced by a small gap. An insulating cup 8 separates the components 6, 7 from the casing 3. A metal cover 1 sealed by a washer 2 to the casing 3 carries a steel blade 9 making connection with the collector 7. The copper oxide of the electrode 4 may be replaced copper sulphide, silver chromate or lead chromate. The electrode 6 may alternatively consist of sodium or calcium. The electrolyte permeates the electrode 4 and separator 5 and comprises lithium perchlorate dissolved in a mixture of tetrahydrofuran and dimethoxyethane, propylene carbonate or dimethyl carbonate. Excess electrolyte is contained in the space 10.