Abstract: According to one embodiment, a connecting busbar includes a pair of first connecting portions provided on first end portions, a pair of second connecting portions provided on second end portions, and a coupling portion that couples the first end portions and the second end portions. Each of the first connecting portions and the second connecting portions is provided with projecting portions that project toward each of positive electrode terminals and negative electrode terminals, and a connecting opening portion provided on a tip end of the projecting portion. The projecting portion is joined to the positive electrode terminal and the negative electrode terminal by performing welding such as laser welding on a thinned portion in a state that a surface of a curved portion contacts with the positive electrode terminal and the negative electrode terminal while the connecting opening approaches the positive electrode terminal and the negative electrode terminal.

Abstract: A secondary battery apparatus including a housing, a plurality of battery cells housed in the housing, and adhesive agent which adheres to the battery cells. In the secondary battery apparatus, the housing includes an inner surface facing the battery cells, the battery cells each has an outer can whose main component is metal, and the housing includes resin as a main component of its constituent element.