| 摘要 |
PROBLEM TO BE SOLVED: To prevent the corrosion of metal wax by brazing a the clearance between an insulating ceramic material fitted into an opening hole of a metal outer case member of sealing and fixation and a positive electrode terminal fitted outer in this ceramic material with the aluminum alloy as brazing filler metal for sealing and fixation. SOLUTION: A clearance between a ring-like ceramic material 3, which is inserted into an opening hole of an outer annular metal member 5 inserted into an opening of a metal cover part for fixation, and a pin-like positive electrode terminal 1 fitted in the ceramic material 3 is sealed by the brazing filler metal 4 for insulation and fixation. At least the metal wax 4 between the positive electrode terminal 1 and the ceramic material 3 preferably includes aluminum at 85%, and includes other metal such as Si at 6.8-7.8%, Mg at 2-3% and a fine quantity of Fe as the other components. With this composition, even if the electric potential of the positive electrode terminal 1 becomes high, corrosion due to the melting of the brazing filler metal 4 is prevented. As the positive electrode terminal 1, aluminum or the alloy thereof which are not corroded by melting, is of used suitably. When the terminal is a negative electrode, brazing filler metal mainly composed of copper is preferably used. |
