Patent ID: 7658774

Claim:
A method of producing a grid for a lead-acid battery, comprising the steps of: (1) passing lead alloy foil together with a base material sheet of a lead-calcium alloy between a pair of rollers to attach the lead alloy foil to the base material sheet, to make a composite sheet, and (2) passing the composite sheet between a plurality of pairs of rollers to gradually roll said composite sheet to a predetermined thickness after said step (1), wherein the thickness t (mm) of the lead alloy foil, the thickness a (mm) of the base material sheet, the thickness b (mm) of the composite sheet before said step (2), and the radius r (mm) of the roller in said step (1) satisfy the relational expressions: 1.3≦( a+t )/ b , and 10 ≦r ·cos −1 [1−{( a+t−b )/2 r} ].