| 摘要 |
A primary electrochemical cell having an oxidizable active anode, a cathode current collector, and an electrolytic solution comprising a liquid cathode material and an electrolyte solute dissolved therein. The cathode current collector includes two catalyst elements; the first is a cylinder of porous carbon material, and the second is a stack of discs of porous nickel material adjacent to one end of the porous carbon element. The amounts of the anode material, electrolytic solution, and porous carbon material are related such that the effectiveness of the porous carbon material as an active catalyst is exhausted prior to the anode material and the electrolytic solution, at which time the porous nickel material becomes effective as the active catalyst material. The electrochemical cell produces a steady output voltage at one level while the porous carbon material is the active catalyst and produces an output voltage at a lower level when the porous nickel material becomes the active catalyst. The drop in output voltage provides a signal that the cell is approaching the end of its useful discharge life.
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