Patent ID: 8202642

Claim:
A current collector for a non-aqueous secondary battery, the current collector comprising a strip-shaped metal foil for carrying at least a positive electrode active material or negative electrode active material, wherein: protrusions are formed in a pattern on at least one face of the metal foil, wherein the protrusions extend along a longitudinal direction and along a width direction, said width direction being shorter than the longitudinal direction, the pattern comprises: rows in which the protrusions are aligned linearly at an equal pitch in the width direction, wherein row units comprising a group of the protrusions aligned in the width direction are aligned in parallel, wherein adjacent row units have an interval in the longitudinal direction, the respective protrusions of any one of the row units are displaced in the width direction from the protrusions of another row unit that is adjacent in the longitudinal direction, and the interval for the aligned row units decreases gradually in a direction from one longitudinal current collector end toward the other longitudinal end.