In the power electronics control, transformation, driving, and signal transmission fields, cooling challenges have become the major constraint for the idealization of product developments. Liquid cooling techniques became the thermal management approach of priority.
Several liquid and water cold plate techniques are available for selection depending on the application scenarios.
Exposed-tube technique: This technique applies to devices to be installed on one side. Copper tubes are pressed to deform into the grooves within an aluminum plate and then a fly-cut is applied to the surface. This allows the quick removal of heat due to the high thermal conductivity of copper tubes. Meanwhile, the lightweight of aluminum can reduce the total weight and keep the cost to a reasonable extent.
Sandwiched-tube technique: There are tubes between two plates and this technique is simple with lower cost. The combination could be aluminum plate + aluminum tubes/copper tubes/SUS tubes.
Friction stir welding process: under the action of pressure, under the action of constant or incremental pressure and torque, the relative movement between the welding contact end faces generates friction heat and plastic deformation heat on the friction surface and its nearby area, so that The temperature of the nearby area rises to a temperature range close to but generally lower than the melting point, the deformation resistance of the material is reduced, the plasticity is increased, and the oxide film at the interface is broken. Under the action of the upsetting pressure, the material undergoes plastic deformation and flow, and the molecules passing through the interface A solid-state welding method that achieves welding by diffusion and recrystallization.
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