A battery module, comprising: a plurality of secondary pouch batteries stacked in a front and rear direction when viewed in F direction, each including an electrode assembly having a positive electrode plate and a negative electrode plate with a separator being interposed therebetween, an electrolyte, an exterior case configured to accommodate the electrode assembly and the electrolyte in an inner space thereof, and an electrode lead having a body whose one end is electrically connected to the positive electrode plate or the negative electrode plate of the electrode assembly and the other end protrudes outward from the exterior case and a plate-shaped head extending in both, the front and the rear direction perpendicular to the upper and lower protruding directions of the body from the other end of the body, the electrode lead being at least partially made of an electrically conductive material; and a bus bar having a plate shape at least partially made of an electrically conductive material, the bus bar having a slit formed to extend inward from one end thereof so that a portion of the body is inserted into the slit, the lower surface of the head being positioned to face an upper surface of the bus bar, and the bus bar being welded to the electrode lead, wherein the body has a protrusion-shaped stopper formed at a portion thereof to protrude forward and rearward on each of the front surface and the rear surface thereof, wherein the head is formed such that a thickness thereof in a direction facing the bus bar is greater than a thickness of the body in the front and rear directions perpendicular to a relatively broader side surface of the body among side surfaces of the body. a plurality of secondary pouch batteries stacked in a front and rear direction when viewed in F direction, each including an electrode assembly having a positive electrode plate and a negative electrode plate with a separator being interposed therebetween, an electrolyte, an exterior case configured to accommodate the electrode assembly and the electrolyte in an inner space thereof, and an electrode lead having a body whose one end is electrically connected to the positive electrode plate or the negative electrode plate of the electrode assembly and the other end protrudes outward from the exterior case and a plate-shaped head extending in both, the front and the rear direction perpendicular to the upper and lower protruding directions of the body from the other end of the body, the electrode lead being at least partially made of an electrically conductive material; and a bus bar having a plate shape at least partially made of an electrically conductive material, the bus bar having a slit formed to extend inward from one end thereof so that a portion of the body is inserted into the slit, the lower surface of the head being positioned to face an upper surface of the bus bar, and the bus bar being welded to the electrode lead, wherein the body has a protrusion-shaped stopper formed at a portion thereof to protrude forward and rearward on each of the front surface and the rear surface thereof, wherein the head is formed such that a thickness thereof in a direction facing the bus bar is greater than a thickness of the body in the front and rear directions perpendicular to a relatively broader side surface of the body among side surfaces of the body.