A battery module, comprising: at least one battery cell having electrode leads protruding at both sides thereof; and at least one cell case configured to cover both sides and an upper side of the at least one battery cell and including a pair of bus bars (270, 280) having one end connected to the electrode lead and the other end exposed upwards, wherein the at least one battery cell includes: an electrode assembly; a battery case having a case body accommodating the electrode assembly and a case terrace extending from the case body; and the electrode leads protruding at both sides of the case terrace, wherein the cell case covers both sides of the case terrace and an upper side of the battery case, wherein the cell case includes: a first case frame and a second case frame configured to cover both sides of the case terrace; and a third case frame configured to cover the upper side of the battery case and connect the first case frame and the second case frame, wherein the first case frame and the second case frame have a bus bar placing groove (212, 232) at which each bus bar is placed, characterized in that each of the pair of bus bars includes: a body plate (272, 282) placed on the bus bar placing groove (212, 232); a lead connection portion placed on the bus bar placing groove (212, 232), extending from one end of the body plate and welded to the electrode lead; and an upper exposed portion extending from the other end of the body plate and placed on the third case frame. at least one battery cell having electrode leads protruding at both sides thereof; and at least one cell case configured to cover both sides and an upper side of the at least one battery cell and including a pair of bus bars (270, 280) having one end connected to the electrode lead and the other end exposed upwards, wherein the at least one battery cell includes: an electrode assembly; a battery case having a case body accommodating the electrode assembly and a case terrace extending from the case body; and the electrode leads protruding at both sides of the case terrace, wherein the cell case covers both sides of the case terrace and an upper side of the battery case, wherein the cell case includes: a first case frame and a second case frame configured to cover both sides of the case terrace; and a third case frame configured to cover the upper side of the battery case and connect the first case frame and the second case frame, wherein the first case frame and the second case frame have a bus bar placing groove (212, 232) at which each bus bar is placed, characterized in that each of the pair of bus bars includes: a body plate (272, 282) placed on the bus bar placing groove (212, 232); a lead connection portion placed on the bus bar placing groove (212, 232), extending from one end of the body plate and welded to the electrode lead; and an upper exposed portion extending from the other end of the body plate and placed on the third case frame. an electrode assembly; a battery case having a case body accommodating the electrode assembly and a case terrace extending from the case body; and the electrode leads protruding at both sides of the case terrace, wherein the cell case covers both sides of the case terrace and an upper side of the battery case, wherein the cell case includes: a first case frame and a second case frame configured to cover both sides of the case terrace; and a third case frame configured to cover the upper side of the battery case and connect the first case frame and the second case frame, wherein the first case frame and the second case frame have a bus bar placing groove (212, 232) at which each bus bar is placed, characterized in that each of the pair of bus bars includes: a body plate (272, 282) placed on the bus bar placing groove (212, 232); a lead connection portion placed on the bus bar placing groove (212, 232), extending from one end of the body plate and welded to the electrode lead; and an upper exposed portion extending from the other end of the body plate and placed on the third case frame. a first case frame and a second case frame configured to cover both sides of the case terrace; and a third case frame configured to cover the upper side of the battery case and connect the first case frame and the second case frame, wherein the first case frame and the second case frame have a bus bar placing groove (212, 232) at which each bus bar is placed, characterized in that each of the pair of bus bars includes: a body plate (272, 282) placed on the bus bar placing groove (212, 232); a lead connection portion placed on the bus bar placing groove (212, 232), extending from one end of the body plate and welded to the electrode lead; and an upper exposed portion extending from the other end of the body plate and placed on the third case frame. a body plate (272, 282) placed on the bus bar placing groove (212, 232); a lead connection portion placed on the bus bar placing groove (212, 232), extending from one end of the body plate and welded to the electrode lead; and an upper exposed portion extending from the other end of the body plate and placed on the third case frame.