Current collector and battery

A battery comprising:

• an electrode body;
• and
• an external terminal, wherein:
• the electrode body includes a first electrode, a second electrode, and a separator;
• the first electrode includes a current collector and an active material layer;
• the current collector includes a support layer, a first conductive layer, and a tab;
• the support layer is made of a resin composition having electrical insulation properties;
• the first conductive layer is laminated on the support layer;
• the tab includes a first fixed part and a first extended part;
• the first fixed part and the first extended part are made of metal and provided integrally;
• the first fixed part extends along the first conductive layer;
• the first extended part is extended from the first fixed part;
• the first fixed part includes a plurality of first protruding portions;
• the first fixed part is fixed on the first conductive layer by the first protruding portions penetrating into the first conductive layer;
• the active material layer is laminated on the first conductive layer;
• the separator is laminated on the active material layer;
• the second electrode is laminated on the active material layer through the separator;
• and
• the external terminal is electrically connected to the tab.