NOVELTY - The battery (10) has a sealing plate (22) attached to a surface of a bottomed case main body (21) that is opened. An electrode terminal (23) includes a base end (23a) that is attached to the plate. An intermediate part (23b) extends from the base end toward a part to which the terminal is joined along a surface (20a) on a side of a battery outer case (20). A tip end (23c) is joined to the part to which the terminal is joined and joined to the surface on the side of the part to which the terminal is joined. The tip end pushes the part to which the terminal is joined.    USE - Lithium-ion secondary battery for use in a vehicle. Uses include but are not limited to automobile, plug-in hybrid vehicle, hybrid vehicle, electric vehicle, electric truck, motorized bicycle, electric assist bicycle, powered wheelchair and electric railway vehicle.    ADVANTAGE - The battery reduces force that is caused due to reaction force and works on joining portions of the base ends of the terminals to the sealing plate, so that the joining portions are protected. The battery improves conductivity of a positive-electrode active material layer and a negative-electrode active material layer in an efficient manner. The battery allows deformations due to the reaction force to be hard to occur in the base ends of the terminals, so that reliability of the joining portions between the base ends of the terminals and the sealing plate is increased in an efficient manner.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a battery manufacturing method.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a side surface on an exposed-part-side of a positive electrode.    Lithium-ion secondary battery (10)    Battery outer case (20)    Surface on side of battery outer case (20a)    Bottomed case main body (21)    Sealing plate (22)    Electrode terminal (23)    Base end of terminal (23a)    Intermediate part of terminal (23b)    Tip end of terminal (23c)    Flat electrode body (40)