Patent ID: 8734985

Claim:
A jelly-roll type battery unit comprising: a first electrode plate having a first electrode current collector with a first electrode tab, and a first electrode active material layer coated on at least one surface of the first electrode current collector; a second electrode plate having a second electrode current collector with a second electrode tab, and a second electrode active material layer coated on at least one surface of the second electrode current collector; a separator that is interposed between the first electrode plate and the second electrode plate; and a first supporting material disposed on the first electrode current collector, having a cut that extends from an edge to a central portion of the first supporting material, which forms a cut portion that is folded to form a folded portion that faces the first electrode tab and the first electrode current collector, and a non-folded portion that does not face the first electrode tab, wherein, the first electrode tab is connected to an uncoated portion of the first electrode current collector, and the folded portion comprises overlapping layers of the first supporting material.