| 摘要 |
A metal air battery comprises a plurality of cells (6), each including a metal anode and an air cathode (8), a fan (102) arranged to draw air from the atmosphere and to blow it through or past the air cathodes, an alkaline electrolyte reservoir (2) divided into two portions by a weir (50) and a single electrolyte pump (58) whose inlet communicates with one of the said portions and which is arranged to pump electrolyte through the cells whence it returns to the other of the said portions, whereby, in use, electrolyte thus returned flows over the weir back to the said first portion of the reservoir. The weir (50) is of tubular shape, whereby the said one portion of the reservoir is very much smaller than the other, and is of variable height and is connected to a motor (52) arranged to move it between an inoperative height above the normal electrolyte level and an operative height below the normal electrolyte level whereby the said one portion of the reservoir is empty when the battery is not in use but when the battery is to be activated the weir is lowered to its operative height to permit electrolyte to flow into the said one portion of the reservoir from the said other portion of the reservoir. |
