KETEP 세계에너지시장정보

A method for producing a secondary battery (1) that comprises: an electrode body (20) comprising a positive electrode (22) and a negative electrode (24); a battery case (10) that accommodates the electrode body (20); a terminal (30, 40) electrically connected to the positive electrode (22) or the negative electrode (24), and attached to the battery case (10); and an external conductive member (35) having a through-hole (35h), and joined to the terminal (30, 40) outside the battery case (10); the method comprising: an attachment step of attaching the terminal (30, 40) to the battery case (10); an arrangement step of arranging part of the terminal (30) which is attached to the battery case (10), within the through-hole (35h) of the external conductive member (35); a covering step of, after the arrangement step, covering at least part of an upper surface (35u) of the external conductive member (35) with a cover member (2); and a joining step of, after the covering step, joining the external conductive member (35) and the terminal (30) through irradiation with energy rays,
wherein the external conductive member (35) comprises a substantially annular recess (35a), sunk from the upper surface (35u) of the external conductive member (35), around the through-hole (35h); in a plan view, a shortest distance W1 from a peripheral edge of the through-hole (35h) up to the outer peripheral edge of the recess (35a) is 2 mm or larger; and in the joining step, in a cross-sectional view along a direction of penetration into the through-hole (35h), the external conductive member (35) and the terminal (30) are joined in a state where an edge portion of the cover member (2) is disposed between a planned joint portion (31w) of the external conductive member (35) and the terminal (30), and an outer peripheral edge of the recess (35a).