| 摘要 |
1,216,311. Sealed secondary cells. JIRO KOSUGA. 18 Jan., 1968 [21 July, 1966], No. 32925/67. Heading H1B. A hermetically sealed secondary cell comprises a casing, at least one anode and at least one cathode both of which are fully charged as defined below, an electrolyte absorbent spacer between the electrodes and means for dispersing or absorbing and fixing hydrogen generated within the casing, a portion of the anode being exposed from the electrolyte. Fully charged is defined as the state of the electrodes produced. by charging the accumulator at a sufficient rate and for a sufficient period for the charging voltage to drop to a constant minimum voltage and for oxygen and hydrogen generation to substantially cease. In the embodiment shown the nickel-cadmium cell has a casing 7 of nickel-plated steel and cover 9 sealed into the casing by insulating packing 11. Electrical contact between cadmium anode 10 and cover 9 is made by spring 13 which also holds the electrodes in place. Electrolyte is held between the electrodes by absorbent separator 12 so that only part of anode 9 is exposed to electrolyte. Hydrogen produced during recharging is dispersed through the hydrogen-permeable membrane 15 which otherwise closes a plurality of vents 14 in cover 9. In another embodiment a sealed lead-acid accumulator is described in which the casing is made of hydrogen permeable plastics material such as PVC or polyethylene. Palladium may also be used as hydrogen permeable material. The forming in aq. KOH of the electrodes of a Ni-Cd cell of 1À2 Ah. capacity by charging at 3 A. for 5 H. or at 0À6 A. for 17 H. is described. |
