Praedifa Technology Division

Praedifa Technology Division - Battery and Hybrid Electric Drive

Battery and Hybrid Electric Drive


Hybrid Electric Drive


Hybrid electric drive systems basically combine two propulsion concepts: a conventional internal combustion (IC) engine and an electric motor. There are various concepts which are classified according to their system structure (series, parallel and power-split hybrids) and proportion of electric power output (micro hybrid, mild hybrid, full hybrid and range extender). Whereas the batteries of “classic” hybrid drive systems are charged by the IC engine while the vehicle is in motion the increasingly popular plug-in hybrids additionally offer the opportunity to charge the batteries by plugging them directly into a power outlet, which makes it possible to further reduce the fuel consumption of the IC engine.

Besides its main advantage of enabling locally emission-free driving without consuming fossil fuels, the electric motor of a hybrid electric vehicle (HEV) offers benefits when starting from rest or accelerating. In addition, the IC engine of an HEV can operate in a more favorable efficiency range more frequently and for longer periods of time which in turn has a positive effect on fuel consumption and emissions.

The IC engine is typically shut off during downhill driving, braking or coasting.
From a certain speed onward and on longer distances, the hybrid system switches to IC engine mode. The IC engine is able to use excess energy generated during braking for instance (so-called recuperation energy) to produce electricity for the electric traction motor.
As mentioned above, batteries of plug-in hybrid models can also be charged directly from a power outlet.


Both versions produce excess heat due to the necessity of transforming the different voltages between the battery and electric system and the electric motor. Therefore, the electronic components must be cooled. Specifically for water/glycol cooling systems, Parker Prädifa has developed the EPDM material E0529-60 which can economically be produced as larger moldings as well. For versions with thermal oil, the water resistant N8903 (HNBR) compound is available.


Materials for cooling systems in hybrid electric drive systems:
Technical Data Sheet E0529-60

Electric Drive


Unlike hybrid electric vehicles, fully electric vehicles are propelled exclusively by one or several electric motors. The required energy is supplied by batteries charged either by plugging them into charging stations or household sockets. Propelled by electricity as well are fuel cell vehicles that produce the electricity required by the traction motor(s) from the energy carriers hydrogen or methanol directly on board. Which technology will ultimately come out on top in electric mobility is not clear at the moment.

Current electric vehicles are typically equipped with a central electric motor. Its efficiency is clearly higher than that of classic IC engines. Due to diverse advantages such as enhanced efficiency, vehicle stability and active safety, the automotive industry is currently working on the development of so-called wheel hub motors for use in future electric production vehicles as well. As the name suggests, in this case, a traction motor is installed directly in each wheel.
In both cases, the battery supplies the electric motor with power.
Today’s battery electric vehicles almost exclusively use lithium-ion batteries in the cells of which substances such as solvents, conductive salts and additives in various combinations store the electricity. In this aggressive environment, seals also have to be resistant against highly toxic hydrofluoric acid.

For these applications, Parker has developed special EPDM materials such as E3750. For rubber or plastic composite parts, the E9195 compound is particularly well suited.


Materials for batteries in electric vehicles:

Technical Data Sheet E3750


Parker's E-Mobility Solutions


Parker Hannifin GmbH

Engineered Materials Group
Arnold-Jäger-Str. 1
74321 Bietigheim-Bissingen
Tel. +49 7142 351-0