Green Light for Heat Transfer

Wherever a Lot of Computing Is Performed or High Currents Flow, Large Amounts of Waste Heat Are Generated.

That’s why Freudenberg Sealing Technologies has developed a material that combines seemingly contradictory properties: It conducts heat well but is also electrically insulating. The company is already testing initial applications for charging sockets, control units and batteries in electric cars.

Materials generally combine electrical and thermal conductivity or insulate against both electrical current and heat. Now the engineers at Freudenberg Sealing Technologies have developed an elastomer that merges relatively high heat capacity with electrically insulating properties by combining silicone rubber with special fillers. The innovative material will be used primarily in electric car components, since semiconductors and other current-carrying elements are never completely lossless. Any electrical energy that isn’t used for computing or switching becomes waste heat that must be dissipated into the ambient air or a cooling system. Electronic components may thus be mounted in thermally conductive aluminum housing, for example, which dissipates the heat either via cooling water or convection. The closer the circuit board is positioned to the heat sink, the more efficient is the heat transport. The heat conductivity can be reduced by roughness in material surfaces, even at levels that are invisible to the human eye.

Modified Silicone

Senior Application Manager Armin Striefler explains why the experts at Freudenberg decided to use silicone – rarely used in car manufacturing – as the base material.

Senior Application Manager, Armin Striefler, said:

“Our material retains its properties over a very high temperature range, from minus 50 to plus 250 degrees Centigrade, but it can be deformed with relatively low force.”

When sprayed on a metal surface, it fills the tiny gaps caused by roughness, which not only improves the heat transfer but also enables adhesion without additional surface treatments. The material developed by Freudenberg has a high dielectric strength of at least 20 kilovolts per millimeter. Adding the fillers increases the heat conductivity from 0.2 to 1.5 to 2 watts per meter kelvin. As a comparison, air has a heat conductivity of 0.026 watts per meter kelvin under normal conditions. The fillers themselves are special metal compounds; knowing how to combine and process them is part of Freudenberg’s expertise.

Perspectives for Electric Cars

The first series application for this new material class could lie in the charging socket of electric vehicles. This is where car manufacturers face a challenge: To rule out possible malfunctions, the charging current must be monitored directly at the socket through continuous temperature measurements. However, the temperature sensors also have to be electrically shielded to prevent short circuits. One solution: Just like the pin holders, the temperature sensors are overmolded with thermally conductive silicone from Freudenberg. In the same molding press, the underlying connector plate is also molded of standard thermoplastic to create a single mountable component. The first prototypes for the charging socket with integrated sensors are already being tested by a car manufacturer.

heat material solutions
Freudenberg Sealing Technologies has developed a material that combines seemingly contradictory properties: It conducts heat well but is also electrically insulating.

This material can also be applied for the targeted cooling of control units, such as those used to switch the current between the battery and drivetrain of an electric vehicle. While the power electronics are cooled through the aluminum housing, the heat emitted by the electronic components generally radiates only into the air between the circuit board and housing wall. This is where the benefits of the silicone fully come into play: It can be produced as any three-dimensional molded part, thus enabling direct contact between components, even if these components are usually positioned at different heights. This allows the heat flow to dissipate directly into the housing. An initial application in the battery control unit of a hybrid commercial vehicle is already being tested.

Freudenberg’s thermally conductive elastomers also open up new opportunities for batteries, the core elements of every electric car. During rapid charging or when high performance is required while driving, the busbars used to connect battery modules and power electronics produce a relatively large amount of waste heat. Here, the use of thermally conductive silicone also makes a significant contribution to dissipating the waste heat from the heat source to the heat sink. The Freudenberg engineers applied their expertise in creating a bond between the materials used in the application and the special silicone. This improves the entire system.

Technical Director of Special Seals at Freudenberg Sealing Technologies, Joachim Heinemann, said:

“We’re still in the beginning stages of applying the thermally conductive elastomers, but we can already see that the combination of thermal conductivity and electrical insulation has great potential to make future generations of electric cars more efficient.”

www.fst.com

Originally published here

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