Abstract: A battery pack includes a plurality of batteries interlocked linearly through a connector. 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 have a step in between, and the step places the inner peripheral portion in a concave portion of the connector. The inner peripheral portion of the connector is located interiorly of a caulking convex strip provided at an end face of one battery, and an inner peripheral portion is connected to the battery end face through welding without coming in contact with the caulking convex strip. The outer peripheral portion is connected to an outer peripheral portion of a battery end face of the other battery through welding.

Abstract: A power source apparatus has a plurality of the battery modules housed in a case. The battery modules include a plurality of batteries joined in a straight line fashion. These battery modules are connected via bus-bars. Metal plate output terminals are attached to both ends of a battery module in a manner that is perpendicular to, and projecting from the battery end-planes. The case of the power source apparatus houses the battery modules with adjacent battery module output terminals connected via bus-bars.

Abstract: A battery pack includes a plurality of batteries interlocked linearly through a connector. 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 have a step in between, and the step places 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 provided to 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. The outer peripheral portion is connected to an outer peripheral portion of a battery end face of the other battery through welding.

Abstract: The power source apparatus has a plurality of battery modules, comprising a plurality of batteries joined in a straight line fashion, housed in a case. These battery modules are connected via bus-bars. Metal plate output terminals are attached to both ends of a battery module in a manner that is perpendicular to, and projecting from the battery end-planes. The case of the power source apparatus houses battery modules with adjacent battery module output terminals connected via bus-bars.