12. June 2019 | Mobiltech

In case of accidents secured against electric shocks

Die thermoREFLEX-Schutzhülle aus Aramidgewebe
The thermoREFLEX protective cover made of aramid fabric
Source: Frenzelit
Protection against bursting, fire and contact are sensitive aspects in the construction of electric cars. Even in the event of an accident, all high-voltage components must be secured in such a way that there is no risk of fire or electric shock to occupants or emergency personnel. This aspect is important for the approval of new electric vehicles.

Frenzelit GmbH offers car manufacturers a solution for burst and touch protection in which the DC-DC converter in the vehicle is encased in a thermoREFLEX protective cover and thus there is no risk of electric shock in the event of an accident. After an impact, the system may not be voltage-free immediately. Although fuses trip in the millisecond range, power components may still be live at first and must not be touched.

The protective cover consists of an aramid fabric (with recesses for power cables, cooling lines and fixing points) with a special coating. Due to their high tensile strength, aramid fibers are particularly well suited, for example, to prevent debris from penetrating the fabric sheath. In order to compensate for the fabric's poor weather resistance, the company also applied a UV and moisture resistant coating that achieved high dielectric strength. Even after various ageing processes, the insulation resistance is 10 Mega-Ohm. Various tests were carried out for this purpose, including climate change test, climate resistance test, salt spray test, chemical resistance, high-low temperature storage, thermal shock test and humidity.

Not least thanks to the thermoREFLEX protective cover that encases the DC/DC converter, a vehicle series was able to obtain the desired approval. The textile protection solution developed by Frenzelit is basically suitable for all electric vehicles in order to significantly increase safety in terms of touch and burst protection.

By Petra Gottwald

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