| 摘要 |
PURPOSE:To enhance reliability for long time by indicating the life of cell by detecting the leakage of liquid by providing a liquid leakage detecting part for alkali electrolyte on the surface of a gesket in contact with cell can and sealing plate. CONSTITUTION:The cell can 4 is provided with the anodic mixture 7 and the separator 5, and also the sealing plate 3 is provided with the cathodic mixture. Then, the gasket 1 is inserted into between the cell can 4 and the sealing plate 3, and then sealed to form an alkali cell. In this case, on all or a part of the surface in contact with the cell can 4 and the sealing plate 3, the alkali electrolyte-detecting parts 2 and 2', e.g., an adhesive, resin, etc., containing a pH indicator, e.g., phenolphthalene, etc., whose color is clearly changed when contacting with the alkali electrolyte, is filmily formed by a spraying method, etc., and preferred pH incidators used include, besides phenolphthalene, methyl red, phenol red, etc., in addition to a metal incidator to respond to Na and K salts, etc. |
