| 摘要 |
PURPOSE:To prevent sodium from sticking to the upper end of a negative elec trode terminal by providing a throughhole and a projection part on the bottom of a recessed part formed on the upper part of an negative electrode terminal while positioning a sodium tank on this recessed part and boring the sodium tank by the projection part to vacuum-filling sodium inside a negative electrode chamber. CONSTITUTION:A negative electrode terminal 5 having a recessed part 5A on the top, while having a projection part 5B on the bottom of this recessed part 5A and being provided with a throughhole 5C on the bottom is prepared. One end of a negative electrode collector 6A having a groove part 6A' is fitted from the underside or the throughhole 5C, the other end of this collector 6A is inserted into the inside of metal fibers 7 to weld the negative electrode termi nal 5 to a negative electrode lid 3. An O-ring 12 is arranged on the bottom of the recessed part 5A, thereabove a sodium tank 13 filled with sodium 8 is positioned, exhaust is performed under heating from the throughhole 50 into a negative electrode chamber the projection part 5B bores the sodium tank 13 to vacuum-fill the negative electrode made chamber with sodium 8 for being made a negative electrode chamber constitution body. |
