酸化銀電池の電解液漏洩封止に関する研究 ２ ガスケットの応力解析に基づく封止面のすきまの検討

Abstract

Clearance between anode can and gasket is evaluated by finite element method. First step of the analysis is to get contact stresses between gasket and anode can as axis-symmetric elastic deformation. Young's modulus of nylon from which the gasket is made is estimated from stress strain curve and from stress relaxation test data of nylon test pieces. Loads and boundary conditions are decided from difference between the shape of gaskets in the batteries and taken out from the batteries. In result, maximum contact stress is about 200MPa on periphery of anode can. Second step of the analysis is clearance estimation between gasket and anode can of which surface is modeled by an isosceles triangle shape. Relation between contact stresses and clearances is given. In macroscopic, no clearance exists near the periphery of anode can. Scratch shape on the anode can is important. If the ratio of depth to width is over 0.1 times, clearances exist in 200MPa. In electron microscopic observation, sharp scratches exist in the surface of anode can. Therefore, as the time the battery is made, only microscopic clearances exist, and no macroscopic clearances exist, between the gasket and anode can.