Secondary battery

Abstract

A secondary battery includes an outer package member and a battery device. The outer package member has a columnar shape. The battery device is contained inside the outer package member and includes a first electrode and a second electrode. The first electrode and the second electrode are opposed to each other and wound. The first electrode includes a leading end part located on a side close to a center of the battery device. The leading end part is wound once or more on a side closer to the center of the battery device than the second electrode, and includes one or more bent parts. In the one or more bent parts, the leading end part is bent to be partly recessed toward the center of the battery device.

Dependencies are inferred from the claim text.