| 摘要 |
Primary electrochemical element 1 of the button type which is arranged to give a warning towards the end of the discharging of the element as an indication that the element is approaching the end of its life. The element 1 comprises a pair of flat porous carbon cathode elements 5, 9 at a distance from each other and each in the form of a plate arranged in a small generally flat metal casing 2 for the element together with a generally flat anode structure 7 arranged between the pair of carbon cathode elements 5, 9. The anode structure 7 comprises a first 15 and a second 16 electrochemically active part, for example lithium and calcium, with different oxidation potentials in the element which can be consumed by electrochemical reaction in the element during the discharging of this. The consumption of the active parts during discharging of the element results in the establishment of different operating voltages for the element, which voltages can be distinguished from one another. The active parts are arranged in such a way in relation to each other that the active part with the highest oxidation potential (that is the lithium 15) is consumed before the second active part (that is the calcium 16). The change in the value of the operating voltage of the element on account of the successive consumption of the two active parts is detected to provide a warning indication as a sign that the element is approaching the end of its life. <IMAGE> |
