Battery module and manufacturing method of the same

A battery module according to an embodiment of the present disclosure includes a battery cell stack in which a plurality of battery cells including an electrode lead are stacked; and a lead frame located on one side of the battery cell stack. A first electrode lead protruding from a first battery cell among the plurality of battery cells and a second electrode lead protruding from a second battery cell among the plurality of battery cells are bent after passing through a slit formed in the lead frame and then overlapped to form an electrode lead assembly. In the electrode lead assembly, at least a part of the first electrode lead and at least a part of the second electrode lead are joined to each other. The lead frame includes a first support part on which the electrode lead assembly is located. The first support part has a shape that is protruded in a direction in which the electrode lead assembly is located or a shape that is recessed in a direction opposite to the direction in which the electrode lead assembly is located. At least a part of the electrode lead assembly is in close contact with one surface of the first support part.