| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrolyte injection structure having good productivity and improve the reliability of electrolyte seal by fixing an electrolyte injection tube to a part of a battery case through it, sealing a part of the injection part by pinching after an electrolyte is injected, and sealing the tip of the injection pipe by welding. SOLUTION: An electrolyte injection tube 25 is welded through a lid part 21 by a brazing filter material or solder 26 and sealed and fixed. As the material of the injection tube 25, copper, aluminum and stainless are preferably used from the viewpoint of electrolyte resistance, weldability, working property, and corrosion resistance. A press-bonded part 25a by punching is provided in a part of the injection tube 25, and the injection tube 25 is temporarily sealed after an electrolyte is injected. Thereafter, the tip of the injection tube 25 is completely sealed by welding. The welding of the tip of the injection tube 25 is performed by melting the brazing filler material or solder in the tip part of the press-bonded part 25a to fill it, or fusing the tip by laser welding. Thus, the electrolyte injecting work can be safely performed with good workability, and the reliability of leakage prevention of electrolyte can be kept over a long period. |
