NOVELTY - The battery has first and second connecting parts (8b, 8c) respectively formed on first and second surface sides of a flange (8a). The flange and the second connecting part are arranged on a battery exterior side than a sealing body. The first connecting part penetrates a through-hole of the body. The second connecting part is inserted into a through-hole of an external conduction element, and includes a tip part swaged on the external conduction element. An abutting part of a tip of a swaged part (8d) of the second connecting part and the external conduction element is weld-connected.    USE - Prismatic secondary battery i.e. non-aqueous electrolyte secondary battery. Can also be used for an alkali secondary battery, an on-vehicle secondary battery of electric vehicles (EVs) and hybrid electric vehicles (HEVs), stationary storage battery systems in applications for suppressing output variation of photovoltaic power generation and wind power generation, and grid power peak load shifting applications for storing power at night and in daytime.    ADVANTAGE - The battery reduces resistance value of the connecting part and suppresses aging variation of the resistance value as the terminal element and the external conduction element are connected by the swaged part and the welded part in the prismatic secondary battery. The battery can stably form the welded part as the abutting part of the tip of the swaged part of the second connecting part and the external conduction element is welded, thus improving reliability. The flange of the terminal element exists between the welded part of the terminal element and the external conduction element, and the insulating element is interposed between the terminal element and the sealing body, so that the transformation and deformation of the insulating element caused by heat generated during welding can be effectively suppressed. The second connecting part is inserted into the through-hole of the external conduction element and swaging-fixed, so that less elements are swaging-fixed, and shape of the swaged part is stabilized, thus suppressing variation in thickness of the swaged part of the terminal element, and stably performing abutting of the tip of the swaged part and the protruding part or the step part provided on the external conduction element, and hence stabilizing quality of the welded part of the abutting part to provide higher reliability. The battery provides the through-hole side surface of the external conduction element of the first protruding part as an inclined surface or curved surface, so that the battery prevents a gap from being generated among the terminal element, the insulating element and the sealing body after swaging, thus preventing cracks and voids from being generated in the welded part, and hence providing the battery with high sealability. The battery performs welding connection between the positive electrode substrate exposed portion and the positive electrode collector and between the negative electrode substrate exposed portion and the negative electrode collector in portions corresponding to mouths of the insulating sheets, so that wattless current during welding can be reduced when the substrate exposed portion and the collector are weld-connected by resistance welding, generation of sputtering during welding can be suppressed and damage of the electrode assembly caused by sputtering can be prevented. The connecting part of the terminal element and the external conduction element is formed in a recessed part of the external conduction element so as to prevent damage and breakage of the connecting part caused by contact of other part and jig with the connecting part during manufacturing process or use.    DESCRIPTION OF DRAWING(S) - The drawing shows an enlarged view of an X-portion of a prismatic secondary battery.    Flange (8a)    Connecting parts (8b, 8c)    Swaged part (8d)    Insulating element (11)    Terminal plate holder (24)