Battery pack

A battery pack, comprising:

• a plurality of linearly interlocked batteries;
• and
• a connector, disposed between the batteries to be interlocked, for electrically connecting the batteries, the connector being welded to the batteries to electrically connect the batteries, wherein:
• the connector includes an inner peripheral portion to be welded to one battery, and an outer peripheral portion, provided outside the inner peripheral portion, to be welded to the other battery, the inner peripheral portion and the outer peripheral portion having a step in between, the step placing the inner peripheral portion in a concave portion of the connector;
• the inner peripheral portion of the connector is present inside a caulking convex strip that is provided on a battery end face of one battery, and connected to the battery end face through welding without coming in contact with the caulking convex strip;
• and
• the outer peripheral portion of the connector is connected to an outer peripheral portion of a battery end face of the other battery through welding.