GB256569A - Improvements in or relating to electric accumulators - Google Patents

Abstract

256,569. Deodato, E. Aug. 7, 1925, [Convention date]. Electrodes; separators; supports for electrodes. - Accumulator electrodes of the bi-polar type consist of plates of insulating material or of metal covered with insulating material, the active material consisting of separate elements secured to one or both sides of the plates. Fig. 5 shows a part of an electrode, the supportins plate 11 being made of steel covered with aluminium 12 and celluloid 13. One active element is shown on each side of the plate, each element consisting of a piece of lead 14 formed with gills between which active material may be placed, the two elements being connected by a rivet 15. Fig. 1 shows a battery in plan, the end plates 11 having active elements on one side only. In order to prevent short-circuiting the elements 14 are arranged in staggered formation. The electrodes are clamped between U-shaped wood frames 16, thus forming a number of cells adapted to contain the electrolyte. The frames are protected by coatings of rubber and celluloid and are clamped by bolts between wooden end plates fitted with metal reinforcements 21 as shown in Fig. 4. These reinforcements extend upwardly to form attachments for handles 24 and downwardly to retain wooden members forming a support for the accumulator. The plates are provided at their upper ends, as shown in Fig. 3, with lugs 26 which rest on fibre strips 27 on the tops of the frames 16 and the cells formed by the plates and frames are closed by covers 28 having ventilating openings as shown in Fig. 4. The end plates are connected by copper bolts 31 to metal blocks 30 provided with bolts 33 to which the external connections are made. In order to facilitate removal of the electrodes they are formed with slots 34 with which a hooked tool can be engaged. The electrodes may be of the unpasted or pasted type employing lead, copper, ferro-nickel &c. as the active material. The Specification as open to inspection under Sect. 91 (3) (a) states that instead of being bipolar the electrodes may be joined in parallel in two groups in the ordinary way. In this case the plates are made of metal to which the active elements are joined electrically. This subjectmatter does not appear in the Specification as accepted.