Heat exchanger for gases, in particular for the exhaust gases of an engine

A heat exchanger (1) for gases, the heat exchanger (1) comprising a bundle of tubes (2) arranged inside a casing (3) defining a gas inlet (4) and a gas outlet (5), the tubes (2) being configured for the circulation of the gases with a view to exchanging heat with a coolant, and the tubes (2) being distributed in at least one column having a plurality of rows defining a plurality of spaces (8) between the rows, and comprising a coolant inlet pipe (9) and coolant outlet pipe (10) connected to the casing (3), and a bypass channel (11) incorporated into the casing (3) and connecting the spaces (8) defined between the rows of tubes (2) located facing the bypass channel (11) with the coolant outlet pipe (10) to improve the distribution of the coolant, wherein the bypass channel (11) is associated with a closing plate (12) coupled to the casing (3) in the inner space located facing the channel (11), the closing plate (12) comprising at least one lateral through opening (13) provided to allow controlled passage of coolant between an inside of the casing (3) and the bypass channel (11);

• and
• wherein said closing plate (12) is a single piece closing plate (12) and has a first portion disposed perpendicular to a length of said tubes and a second portion disposed parallel to the length of said tubes.