Patent ID: 8142935

Claim:
A method for producing a lead acid battery, comprising: passing a metal sheet which is made of lead or lead alloy between two disk cutter rolls to form slits in said metal sheet in a staggered pattern, wherein each of said two disk cutter rolls includes ridges which are formed in a whole periphery of each of said two disk cutter rolls to penetrate said metal sheet; then carrying said metal sheet along a peripheral face of one of said disk cutter rolls; then pulling out said metal sheet from said peripheral face in a tangential direction to said peripheral face, wherein said tangential direction is tangent to said peripheral face at a point where said metal sheet is detached from said peripheral face; and then producing a lead acid battery by using said metal sheet as a grid for an electrode, wherein a plane defined by axes of rotation of said disk cutter rolls and a plane perpendicular to said tangential direction define an angle θ which ranges from 5 degrees to 90 degrees, wherein at said pulling out step said ridges of one of said two disk cutter rolls are extracted from said slits of said metal sheet after said ridges of the other one of said two disk cutter rolls are extracted from said slits of said metal sheet so as to prevent said metal sheet from being undulated when pulling out said metal sheet from said peripheral face, and said disk cutter rolls are arranged such that said plane defined by the axes of rotation of said disk cutter rolls is at an oblique angle with respect to true vertical.