| 摘要 |
<p>A button-type primary electrochemical cell (1) operative to provide a warning indication toward the end of discharge of the cell signalling an approaching end-of-life of the cell. The cell (1) includes a pair of spaced-apart, flat, porous carbon cathode elements (5, 9), each in the form of a disc, disposed within a small, generally-flat metal housing (2) of the cell, and a generally-flat anode structure (7) disposed between the pair of carbon cathode elements (5, 9). The anode structure (7) includes first (15) and second (16) eletrochemically active elements, for example, lithium and calcium, having different oxidation potentials within the cell and consumable by electrochemical action within the cell during discharge of the cell. The consumption of the active elements during discharge of the cell results in the establishment of different and distinguishable operating voltages for the cell. The active elements are arranged with respect to each other such that the active element of higher oxidation potential (i.e., the lithium (15)) is consumed prior to the other active element (i.e., the calcium (16)). The change in value of the operating voltage of the cell due to the successive consumption of the two active elements is detected to provide a warning indication signalling to approaching end-of-life of the cell.</p> |
