LEAD-ACID BATTERY, AND MANUFACTURE THEREOF

摘要

PROBLEM TO BE SOLVED: To improve corrosion resistance of a lead-acid battery group weld part comprising grid edge parts and a strap of different alloy compositions in which both are welded with each other by preliminarily avoiding interganular corrosion generated because of a granular structure. SOLUTION: A grid lug part 2 close to a junction boundary of the grid lug part 2 with a strap 3 is formed to have a fibrous structure 1 in a perpendicular direction in a thickness direction of it and in a length direction of the lug part 2. For this purpose, a process of obtaining a multi-layer structure part comprising the fibrous structure 1 coated with low fusing point alloy 4, a process of bringing a molten pool of alloy to be the strap 3 in contact with the multi-layer structure lug part, and fusing low fusing point alloy 4 while restricting fusing and recrystallization of the part of the fibrous structure 1 to weld and integrate the strap 3 and the multi-layer structure lug part with each other.