Heat exchanger for a motor vehicle

A heat exchanger comprising a first header plate, a second header plate and a heat-exchange core extending between the first header plate and the second header plate along a longitudinal direction, the heat-exchange core being delimited by a shell and including a plurality of tubes that are disposed successively next to one another in a transverse direction, each tube being able to cooperate with the first and second header plates via through-orifices that are produced in each of the first and second header plates, wherein the shell has at least one longitudinal end configured to be in planar surface contact with at least one of the first and second header plates in a contact zone, the planar surface contact being realized in a plane perpendicular to the longitudinal direction wherein at least one of the first and second header plates has a perforated wall, in which the through-orifices are produced, and a frame arranged at the periphery of the perforated wall and configured to cooperate with the shell, wherein the perforated wall has, in the vicinity of each through-orifice, a clearance formed by a rounded edge or a chamfer, and wherein the at least one longitudinal end of the shell includes at least one protuberance which extends the shell along the longitudinal direction and which has a shape and dimensions complementary to the clearance, wherein the at least one protuberance has, along the whole extension length thereof, a vertical dimension smaller than the vertical dimension of a transverse wall of the shell that extends in the transverse direction while being in contact with each of the plurality of tubes, the vertical dimension being measured in a vertical direction that is perpendicular to the longitudinal direction and the transverse direction.