Heat exchanger

A heat exchanger comprising:

• a tube-fin block that is fluidically connected to two collecting tanks;
• tubes having ends that engage in a bottom of each of the collecting tanks, the bottom of each of the collecting tanks being closed with a cover;
• a partition wall secured to the cover of at least one of the collecting tanks, the partition wall being formed transverse to a longitudinal extension of the at least one of the collecting tanks and dividing an interior space of the at least one of the collecting tanks into two subchambers;
• and
• first stress decoupling devices formed in the bottom of the at least one of the collecting tanks in an area of the partition wall and a second stress decoupling device formed in the area of the partition wall in the cover of the at least one of the collecting tanks,
• wherein, in each of the first stress decoupling devices, a slot that runs in a longitudinal direction of the bottom of the at least one of the collecting tanks is provided, wherein the slot is expanded by a further slot that runs in the transverse direction of the bottom of the at least one of the collecting tanks,
• wherein the slot and the further slot are each formed as through-holes that extend entirely through the bottom of the at least one of the collecting tanks,
• wherein the second stress decoupling device is provided in an upper surface of the cover of the at least one of the collecting tanks and is formed as a corrugation,
• wherein a circumferential border of the cover of the at least one of the collecting tanks, provided at side surfaces of the cover, is formed as a corrugated flange, and
• wherein a first one of the two subchambers has a higher temperature than a second one of the two subchambers, and wherein by being formed in the area of the partition wall, the first stress decoupling devices are only located in an area of the bottom of the at least one of the collecting tanks between a supply connector and an outlet connector, such that a step offset is provided between the two subchambers to relieve stresses transmitted via the bottom to the tubes.