Lithium secondary battery, method for producing power collection foil for same, and power collection foil for same

A method for producing a power collection foil for a lithium secondary battery comprising a boring step of forming a plurality of through-holes penetrating a main surface of a metal foil and having projected parts projected from at least a rear surface of said metal foil, and

• a winding step of winding said power collection foil having a plurality of said through-holes around a winding roll,
• wherein said through-holes are formed by breaking through said power collection foil using a power collection foil processing device;
• wherein diameters of a plurality of said through-holes are 50 to 150 μm;
• heights of said projected parts are 50 to 400 μm;
• and a distance between adjacent through-holes is 300 to 2000 μm;
• in said step of forming said through-holes, punches and dies are butted against each other with said power collection foil being sandwiched between an upper die and a lower die by using a power collection foil processing device constructed of punches formed on one butting surface of each of said upper die and said lower die and dies where concave portions each having a depth longer than a vertical length of each of said projected punches are formed on another butting surface of each of said upper die and said lower die and
• wherein an intermittent transport generated in said boring step of forming said plurality of through holes is returned to a successive transport by transport rolls;
• and
• thereafter said power collection foil having a plurality of said through-holes is successively wound around said winding roll.