What Are The Types Of Liquid Cold Plates?

The increase in heat load of high-power electronic equipment and the requirements of product sealing performance have changed the traditional design thinking, and liquid cooling has become the mainstream trend. Compared with traditional air-cooled radiators, liquid cooling plates have significant performance advantages, especially in high-power equipment and high heat flux. Each product has its advantages, depending on the design of the liquid cold plate, the choice of coolant, the pressure drop requirements and the customer's budget. 

Liquid cold plate is currently used in: renewable energy systems, medical equipment, IGBTs, lasers, data centers, industrial power supplies, defense systems, avionics, battery cooling

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Buried cold plate

Buried pipe cold plate is the simplest form of cold plate, just embed the pipe in the base plate. According to the required thermal performance and coolant, copper or stainless steel tubes are generally used. Use CNC equipment to process pipe grooves on the substrate, embed the pipe into the substrate, and pour the epoxy resin pressure table, or weld in the appropriate position, which can maximize the service life and thermal performance.

Deep hole drilling cold plate

The deep hole drilling cold plate drills a series of holes on the aluminum plate to form multiple flow paths. First determine the inlet and outlet fluid paths, and then drill some holes perpendicular to the main fluid path, and then block some of the holes to form a continuous coolant path. The advantage of this kind of cold plate is that there is no thermal boundary in the manufacturing process, and the aluminum plate has no thermal stress, so it is easier to achieve flatness.

FSW friction stir welding cold plate

The FSW friction stir welding cold plate is constructed by a base plate and a cover plate. On the base plate, CNC is used to add a liquid flow path groove, and then the cover plate is placed in the groove above the flow path, and FSW (Friction Stir Welding) ). Finally, flatten the welding surface by flashing, and add inlet/outlet holes and component mounting holes.

Die-cast cold plate

Die-cast cold plate is a two-piece structure, suitable for complex large-capacity liquid cold plates. Multiple internal and external metal parts can be combined into two die casting tools. After casting, the two die-cast parts are bonded together by welding or using epoxy resin.

Brazing cold plate

Brazing cooling plates are usually used in designs that require low thermal resistance and high performance. This type of cold plate has great flexibility in design, such as thermal resistance, heat flow, pressure drop, fluid path, size, shape, material hardness, surface geometry, and installation of components on both sides of the plate. The interior can be completed by processing the deflector and heat sink from the base material, or by introducing high-performance corrugated aluminum fins, and then brazing these parts together.

Dip Soldering Cold Plate

The components are preheated in an air furnace to ensure that the temperature of all components is uniform, and then the parts are immersed in a molten salt bath. The molten flux is in contact with all inner and outer surfaces at the same time. This liquid is heated very quickly and evenly. The molten pool is a flux, so it can be completely bonded on an oxide-free surface. The immersion time is determined by the object to be heated, but the duration rarely exceeds two minutes.

Vacuum brazing cold plate

Brazing in a high-vacuum environment can control the brazing process to the greatest extent, and any oxidation or fouling phenomenon is the first choice for aerospace components, medical equipment and application equipment with high requirements on parts.