Indirect charge air cooler

A heat exchanger for an internal combustion engine, comprising:

• a plurality of tubes that provide a first channel system for a first fluid,
• a second channel system for a second fluid disposed between the plurality of tubes that is fluidically separated from the first channel system,
• two opposite side parts for fluidically bounding the second channel system, between which the plurality of tubes are arranged,
• at least one frame part that is soldered together with a respective outer edge of the two side parts,
• the outer edge of at least one side part includes a tab bent over S-shaped as edge reinforcement with a first tab section solder-plated on an outside and a second tab section solder-plated on an inside,
• the at least one frame part has an S-shaped cross section with a first receptacle, and the first tab section of the outer edge of the at least one side part is received in the first receptacle, and
• wherein the first receptacle has a U-shaped profile in a cross-sectional view, and wherein the first tab section has a bent portion that is U-shaped in a cross-sectional view received in the U-shaped profile of the first receptacle.