Heat exchanger for a motor vehicle

A heat exchanger for a vehicle, the heat exchanger comprising:

• a plurality of plates,
• wherein the plates are stacked one on top of the other in a stacking direction to form a bundle of plates,
• wherein at least one first plate and at least one second plate of the plurality of plates define a first circulation path that is configured for circulation of a first fluid,
• wherein at least the second plate and at least one third plate define a second circulation path that is configured for circulation of a second fluid,
• the bundle of plates comprising a first distribution chamber that is configured to supply the first circulation path with first fluid,
• wherein the first plate has a through-hole surrounded by a plateau,
• wherein the through-hole is surrounded by an internal raised edge of the plateau,
• wherein the internal raised edge is of a substantially annular shape so as to form, with the hole, a section of a dip channel that is arranged so as to conduct the first fluid toward the first distribution chamber,
• the plateau further comprising:
• an external raised edge,
• wherein the external raised edge of the plateau surrounds its internal raised edge, and
• on its top, an orifice belonging to a return passage of the first circulation path,
• wherein the orifice is between the internal and external raised edges of the plateau, the distance between the internal edge and the external edge of the plateau widening in a region in which the orifice is present.