Battery module, battery pack comprising battery module, and vehicle comprising battery pack

A battery module, comprising:

• a plurality of battery cells having electrode leads protruding in at least one direction;
• and
• at least one bus bar disposed at one side of the plurality of battery cells and connected to the electrode leads of the plurality of battery cells, the at least one bus bar having a beam penetration prevention guider configured to prevent a laser beam from penetrating toward the plurality of battery cells during a laser welding,
• wherein the at least one bus bar includes:
• a bus bar body configured to cover one side of the plurality of battery cells and formed to have a predetermined thickness,
• guide chamfers provided at opposite sides of an upper portion of the bus bar body to guide the laser welding, and
• the beam penetration prevention guider provided in a pair, and the pair of beam penetration prevention guiders provided to the opposite sides of the bus bar body, respectively,
• wherein the pair of beam penetration prevention guiders extend to be inclined downward from the guide chamfers towards a lower portion of the bus bar body, respectively,
• wherein inclined surfaces of the guide chamfers directly connect to opposite ends of an uppermost surface of the bus bar body, respectively,
• wherein inclined surfaces of the pair of beam penetration prevention guiders directly connect to the inclined surfaces of the guide chamfers, respectively,
• wherein the inclined surfaces of the pair of beam penetration prevention guiders directly connect to opposite ends of a lowermost surface of the bus bar body, respectively, and
• wherein the electrode leads laser-welded to the at least one bus bar are in contact only with the pair of beam penetration prevention guiders constituting the opposite side surfaces of the bus bar body without being bent in a horizontal direction at an upper side of the at least one bus bar.