Fin architecture for promoting heat exchange

A cooling device comprising at least one cooling fin, the device being configured to allow a heat-transfer fluid to circulate along the at least one cooling fin in a first direction (D1), a heat exchange being able to be carried out by convection between the at least one cooling fin and the heat-transfer stream, the cooling fin comprising:

• a heat exchange surface configured to allow the heat exchange with the heat-transfer fluid,
• a first wall and a second wall, the first wall and the second wall extending in a plane substantially parallel to the first direction (D1) and substantially perpendicular to the heat exchange surface,
• a cavity contained between the first wall and the second wall, the heat-transfer fluid circulating in the cavity, and
• a heat exchanger contained in the cavity and connected to the heat exchange surface, the heat exchanger having a fractal structure in a plane (P1) perpendicular to the first direction (D1) of the heat-transfer fluid, the heat exchanger comprising repeats of an elementary pattern.