A battery module, comprising: a first electrode lead provided at one secondary battery among a plurality of vertically stacked secondary batteries , the first electrode lead being made of a metal material with a plate shape; a second electrode lead provided at a secondary battery other than the secondary battery having the first electrode lead, the second electrode lead having a plate shape and being made of a metal material different from the first electrode lead wherein the electrode leads provided at different secondary batteries are coupled in contact vertically, the first electrode lead being located at an upper portion and the second electrode lead being located at a lower portion, the first electrode lead being provided at a secondary battery stacked at an upper portion and the second electrode lead being provided at a secondary battery stacked at a lower portion in addition to an upper surface coming into contact with a lower surface of the first electrode lead being welded to the first electrode lead, the second electrode lead having a recess region (L) where the second electrode lead is partially absent below the first electrode lead; and a bus bar made of a metal material with a plate shape, the bus bar coming into contact with the first electrode lead in an area above the recess region of the second electrode lead wherein the bus bar contacts the upper surface of the first electrode lead above the recess region, wherein the bus bar is made of the same metal material as the first electrode lead, wherein the bus bar and the first electrode lead are welded by means of ultrasonic weldingand wherein the recess region of the second electrode lead encompasses an entire area in which the bus bar is in contact with an upper portion of the first electrode lead. a first electrode lead provided at one secondary battery among a plurality of vertically stacked secondary batteries , the first electrode lead being made of a metal material with a plate shape; a second electrode lead provided at a secondary battery other than the secondary battery having the first electrode lead, the second electrode lead having a plate shape and being made of a metal material different from the first electrode lead wherein the electrode leads provided at different secondary batteries are coupled in contact vertically, the first electrode lead being located at an upper portion and the second electrode lead being located at a lower portion, the first electrode lead being provided at a secondary battery stacked at an upper portion and the second electrode lead being provided at a secondary battery stacked at a lower portion in addition to an upper surface coming into contact with a lower surface of the first electrode lead being welded to the first electrode lead, the second electrode lead having a recess region (L) where the second electrode lead is partially absent below the first electrode lead; and a bus bar made of a metal material with a plate shape, the bus bar coming into contact with the first electrode lead in an area above the recess region of the second electrode lead wherein the bus bar contacts the upper surface of the first electrode lead above the recess region, wherein the bus bar is made of the same metal material as the first electrode lead, wherein the bus bar and the first electrode lead are welded by means of ultrasonic weldingand wherein the recess region of the second electrode lead encompasses an entire area in which the bus bar is in contact with an upper portion of the first electrode lead. <EOS>