Sealed battery and assembled battery

A method of manufacturing an assembled battery including a plurality of unit cells having an external terminal arranged outside of a battery case and a busbar which connects the external terminal of one unit cell and the external terminal of another unit cell to each other,

• each of the plurality of unit cells further including
• an electrode body housed inside the battery case, and
• an internal terminal which is connected inside the battery case to the electrode body and of which a part is connected outside the battery case to the external terminal,
• the method comprising a step of connecting two metal members which are present on a conductive path from the internal terminal of one unit cell to the internal terminal of another unit cell and which are constituted by metal materials that differ from one another, wherein
• the step of connecting two metal members includes:
• a rough surface forming step of forming a rough surface having a plurality of recessed portions on at least one of a surface of the one metal member and a surface of the other metal member;
• a plating-joining step of arranging the two metal members so that the rough surface faces another connection object with a gap between the rough surface and the connection object, forming a plated layer between the two metal members, and joining the two metal members to each other by causing a part of the plated layer to penetrate into the recessed portions, and
• the one metal member is an external terminal constituted by a metal material of which a main component is Cu and, at the same time, the other metal member is a busbar constituted by a metal material of which a main component is Al, and
• in the rough surface forming step, an alumite layer having a plurality of micropores is formed on a surface of the busbar by performing anodization on the surface of the busbar.