A battery module (100, 200) comprising a plurality of battery cells (140, 240), the battery module comprising: a busbar (150, 250) configured to connect an electrode lead of one battery cell to an electrode lead (142, 242) of another battery cell; a cooling plate (120, 220) having a first thermal contact portion, which thermally contacts a body of each battery cell or a cooling pin configured to transfer heat of each battery cell, and a second thermal contact portion (124, 224), which thermally contacts one end of the busbar, the cooling plate being configured to transfer heat generated from each battery cell to a heat sink; an insulating member interposed (170, 172) between the one end of the busbar and the second thermal contact portion of the cooling plate and configured to prevent current flow between the busbar and the cooling plate; and a gap filler (180, 182) interposed between the one end of the busbar and the second thermal contact portion of the cooling plate and configured to prevent separation between the busbar and the cooling plate and to transfer heat therebetween; said busbar comprising a body portion formed in a strap shape and contacting the electrode lead of each battery cell; a bent portion integrally formed with the body portion and extending from one end of the body portion to be bent in a thickness direction of the body portion, and the bent portion comprises: a coupling groove (156, 226) coupled to a coupling protrusion (166, 228) that is prepared on the cooling plate or a coupling protrusion that is prepared on a predetermined frame of the battery module, the predetermined frame supporting the busbar; and a thermal contact surface thermally contacting the second thermal contact portion wherein the second thermal contact portion of the cooling plate comprises the coupling protrusion coupled to the coupling groove of the bent portion. a busbar (150, 250) configured to connect an electrode lead of one battery cell to an electrode lead (142, 242) of another battery cell; a cooling plate (120, 220) having a first thermal contact portion, which thermally contacts a body of each battery cell or a cooling pin configured to transfer heat of each battery cell, and a second thermal contact portion (124, 224), which thermally contacts one end of the busbar, the cooling plate being configured to transfer heat generated from each battery cell to a heat sink; an insulating member interposed (170, 172) between the one end of the busbar and the second thermal contact portion of the cooling plate and configured to prevent current flow between the busbar and the cooling plate; and a gap filler (180, 182) interposed between the one end of the busbar and the second thermal contact portion of the cooling plate and configured to prevent separation between the busbar and the cooling plate and to transfer heat therebetween; said busbar comprising a body portion formed in a strap shape and contacting the electrode lead of each battery cell; a bent portion integrally formed with the body portion and extending from one end of the body portion to be bent in a thickness direction of the body portion, and the bent portion comprises: a coupling groove (156, 226) coupled to a coupling protrusion (166, 228) that is prepared on the cooling plate or a coupling protrusion that is prepared on a predetermined frame of the battery module, the predetermined frame supporting the busbar; and a thermal contact surface thermally contacting the second thermal contact portion wherein the second thermal contact portion of the cooling plate comprises the coupling protrusion coupled to the coupling groove of the bent portion.