Patent ID: 7666542

Claim:
A battery pack comprising: a plurality of flat batteries, each of the flat batteries comprising: battery elements that generate power; an exterior member that seals the battery elements within an interior region thereof; and plate-shaped electrode terminals that conduct to an exterior of the exterior member and connect to the battery elements within the interior region, wherein the electrode terminals comprise an output section and a voltage detection section that connects a voltage detection line to a control device that detects an output voltage, and wherein the electrode terminals define a notch between the output section and the voltage detection section to separate the output section and the voltage detection section, wherein both the output section and voltage detection section extend from a same side of the exterior member; wherein the flat batteries are serially connected so that the output sections of the flat batteries are connected together and wherein the voltage detection sections of the plurality of flat batteries are alternately stacked with spacers which are plate-shaped insulation members, and wherein by sandwiching the voltage detection sections between the spacers, the detection section is fixed with respect to a stack direction of the flat batteries.