| 摘要 |
PROBLEM TO BE SOLVED: To improve junction strength without requiring excess radial deformation of a brazing by providing a ring-shaped projection on a junction surface side an either of the brazing and flange portions at the bottom of a negative electrode lid and the top of a positive electrode container pipe which are connected through the brazing to an annular insulating ring and its upper and lower surfaces, and pressurizing the upper and lower surfaces of both flanges at high temperature for diffused junction. SOLUTION: Sulfur 11 is impregnated into carbon fibers between a negative electrode containing sodium 1 and jointed inside an insulating ring 3 made ofα-alumina or the like at its upper portion and a positive electrode pipe 10 containingβ-alumina-made bag-pipe-shaped solid electrolyte pipe 2. Annular aluminum brazings 9, 24 are installed between a negative electrode lower flange 6 of a negative electrode lid 4 and the upper surface of the insulating ring 3 and between a positive electrode flange 15 of a bellows 12 of the positive electrode pipe 10 and the lower surface of the insulating ring 3, and are subjected to the diffused junction by vacuum heating and pressurizing by a jig. They are jointed at high surface pressure at positions of inner and outer peripheral sides ring-shaped projections 7, 8 and 18, 19 projecting to joint surface side of the negative electrode and positive electrode flanges 6, 15, and durability of this battery during temperature increasing/decreasing is improved.
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