Perforated Aluminum Foil Layout for Stable Hole-Boundary Strength

The patent applies local quality by creating different regions within the aluminum foil: a first region with through-holes for ion conductivity, a second region without through-holes for mechanical strength, and a third intermediate region with gradual transition. This spatial differentiation of properties resolves the contradiction between ion conductivity and mechanical strength by optimizing each region's characteristics for its specific function.

The patent employs parameter changes by gradually varying the opening ratio of holes in the third region from the first region side toward the second region side. This continuous parameter transition prevents abrupt mechanical property changes, reducing stress concentration and preventing breakage while maintaining adequate ion conductivity in the transition zone.

The patent addresses manufacturing precision under continuous tension by creating a third region with intermediate hole density at the boundaries between perforated and non-perforated areas. This local modification of structural properties at critical boundary zones prevents excessive deformation and permanent strain (lenticulation) while allowing continuous production processes to proceed efficiently.

The patent applies beforehand cushioning by pre-designing the third intermediate region with gradual hole density transition before the actual manufacturing process. This preparatory structural design cushions against the harmful effects of continuous tension by distributing stress more evenly across the boundary zones, preventing deformation before it occurs during high-speed manufacturing.