POLE PLATE AND SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a flat wound electrode battery capable of ensuring the reliability of a welded portion between a power collection tab and a lead while preventing a breakage in a power collection part during welding and ensuring sufficient number of laminates of the power collection part enabling charging/discharging of a large current.SOLUTION: A sash-like pole plate received in a battery being wound therein includes: a sash-like electrode part with the surface formed with an electrode activation material layer; and plural power collection portions with the surface formed with no electrode activation material layer, which is formed to protrude from the edge in the width direction from the electrode. When an electrode is formed in a flat shape being wound, a cut is formed in the power collection part in a portion where the electrode group is folded.