Abstract: A battery module includes a first member and a second member that are coupled in directions that cross each other, wherein the first member and the second member are weld-coupled; a welding portion of the first member and the second member includes a first welding portion formed on the first member and a second welding portion formed on the second member, based on a coupling surface of the first member and the second member; and the first welding portion and the second welding portion have shapes that are asymmetric to each other.

Abstract: A battery module and a method of manufacturing the same includes: a battery cell stack including a plurality of battery cells, a bus bar frame connected to the battery cell stack, at least one electrode lead connected to the battery cell stack and containing a first metal; and a bus bar overlapping with the at least one electrode lead and containing a second metal, the at least one electrode lead and the bus bar are welded to form a welded portion, the welded portion includes a first region in which a central portion is located in the at least one electrode lead and a second region in which the central portion is located in the bus bar, and precipitates of the first metal and the second metal are distributed in both the first region and the second region.

Abstract: A spot welding jig is provided. The spot welding jig presses electrode leads of battery cells to be closely adhered onto a bus bar when spot welding is performed to the electrode leads interposed on the bus bar along a width direction of the electrode leads. The spot welding jig includes a passing portion through which a welding laser passes, and a predetermined number of barriers configured to vertically partition an inner space of the passing portion.

Abstract: A spot welding jig is provided. The spot welding jig presses electrode leads of battery cells to be closely adhered onto a bus bar when spot welding is performed to the electrode leads interposed on the bus bar along a width direction of the electrode leads. The spot welding jig includes a passing portion through which a welding laser passes, and a predetermined number of barriers configured to vertically partition an inner space of the passing portion.