Secondary battery

A secondary battery, comprising:

• a battery case;
• an electrode body in which a positive electrode, a negative electrode, and a separator are stacked, with the positive electrode and the negative electrode being insulated from each other by the separator;
• and
• a collector member connected to the battery case and the electrode body, wherein
• the positive electrode includes
• a positive electrode collector including an active material layer forming region, an insulation layer forming region adjacent to the active material layer forming region, and a collector region adjacent to the insulation layer forming region,
• a positive electrode active material layer including a positive electrode active material provided on a surface of the active material layer forming region, and
• an insulation layer provided on a surface of the insulation layer forming region,
• the collector member includes a first portion, and a second portion continuous to the first portion and bent relative to the first portion,
• the first portion is fixed to the battery case,
• the second portion is connected, at an end thereof on an opposite side to the bent portion, to the collector region,
• the collector member further including a rib integrally formed, at the bent part, with the first portion and the second portion;
• wherein the rib has a length that is shorter than a space between a top of the electrode body and the first portion of the collector member, and a width that is half or less than a thickness of the electrode body;
• wherein the rib is connected, among surfaces of the first portion and the second portion, to a surface on an opposite side to the electrode body;
• and
• wherein the collector member includes the first portion, the second portion, and the rib, which are continuously and integrally formed, and is at least one of a bent product and a pressed product of a sheet-shaped metal.