Abstract
In this report, it is shown how leakage occurs from the seal that has not macroscopic clearance but has microscopic one through which no alkaline electrolyte can leak from the batteries as refused quality. The seal is made by nylon-gasket and copper of anode can surface. The copper surface of anode-can in the battery has electric potential almost equal to zinc potential, because it is contacted to the zinc anode materials. If the copper is zinc potential and alkaline electrolyte exists, hydrogen gas is generated on it. Generation of hydrogen gas on the modeled copper surface in the seal is confirmed experimentally. And leak speed through sealing which is modeled by pressed copper plate and nylon sheet is investigated. Pressure between copper plate and nylon sheet and surface roughness of the copper plate both of which concern cross section area of microscopic clearance between the plate and nylon sheet affect for the time that alkaline electrolyte leak through out from the seal model. In conclusion, generation of hydrogen gas in the seal is main cause of leakage and decrease of microscopic clearances is one of the most important ways for improving leak characteristics of silver oxide batteries.
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