TECHNOLOGY | COMPOUNDS FOR EVs
uncomfortable. Witcom says its PTFE-free lubricated compounds are providing new options for noise reduction and low wear for gears and bushings.
Above: Evonik’s latest halogen-free flame retarded Vestamid compound protects busbars in high-voltage batteries
The company’s radar grades are based on many
different polymers, including PA, PP, PBT and PC, and use special mixes of conductive additives. They are designed to suppress unwanted multi-path reflections from ghost targets to make sure that the radar sensors and electronics only receive the correct signals. “Some partners have now developed their seventh generation ADAS radar sensors with us,” van Bellingen says. “This safety technology is now key for electric vehicles. There are usually six radar sensors in a car and the move towards more autonomous driving will increase this number in the future. The ADAS system of the more autonomous cars will always consist of a combination of three sensor technologies - radar, lidar and camera.” Electric vehicles are also much quieter than
current internal combustion engine powered equivalents, which means that even the slightest squeaking noises inside the vehicle cabin may be
Busbar insulation Battery systems are a key area of development in the EV sector and plastic compounds are expected to play a significant role in improving performance and reducing weight and cost. Evonik, for exam- ple, has expanded its range of PA 12 compounds for insulation of electrical conductors used in high-voltage EV batteries. The company says that its halogen-free flame retardant Vestamid LX9050 OR grade meets the requirements for UL94 V-0 classification in accordance with IEC 60754. Busbars insulated with the new RAL 2003 signal orange coloured grade (orange is used to indicate high-voltage components) can be used at operat- ing temperatures of up to 125°C. In the future, copper or aluminium busbars in the high-voltage batteries of electric or partially electric vehicles will be expected to provide protection against electrical breakdown to 1,000V and above, as well as the associated risk of fire. Evonik says that Vestamid LX9050 OR meets insulation e-mobility requirements for busbar profiles from 30-150mm2
at a coating thickness of
0.5-0.7mm. The copper or aluminium profiles are coated by co-extrusion and the company says the compound’s processing properties allow high extrusion speeds. Adhesion to the metal core is good, so promoters are not required, and the high elasticity of the grade means coated busbars can be shaped after extrusion and bent without losing the protective effect of the insulation.
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IMAGE: EVONIK
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