PURPOSE: To improve the adhesive property of a grid and an active material, and to increase the service life property, by making a part or the whole body of the crystal formation inside a grid alloy to a recrystallization formation, after filling a paste to be an active material to a grid body prior to the recrystallization.
CONSTITUTION: A slab made of a Pb-Ca-Sn alloy casted by a slab casting machine 1, and a Pb-Sb-Sn alloy foil 3 are delivered to a rolling machine 4 in the condition superposing both members, so as to be rolled, and a lead alloy sheet 5 on which the Pb-Sb-Sn alloy is coated is obtained. And after the sheet 5 is produced, it is expanding processed as in the condition the crystal formation is the rolled formation, a paste is filled, a heat treatment at 60°C or higher is applied, and a part of the grid formation is recrystallized. As a result, when the grid in the rolled formation condition is transferred to the recrystallization formation partially by the heat in the aging drying of the grid, the grid is contracted to a specific height. In such a way, the active material and the grid are adhered strongly, and the service life property is improved.
YONEZU WAKICHI
OKAMOTO HIROSHI
TAKAHASHI KATSUHIRO
