The battery system of the ID.R was developed with expertise from the production car research department at Volkswagen. “One example of this is the isolation technology that shields the on-board electronics from the electromagnetic emissions of the high-voltage system,” explains Bertram. The electric motors on the ID.R operate at 915 volts. In return, insights from the ID.R’s activities flow back into production car development.
This knowledge transfer also influences the charging strategy, both during external charging and during recuperation (brake energy recovery) while driving. “The aim is to send the ID.R onto the track for the record attempt with each individual battery cell at the optimum state of charge,” says Bertram. In the temporary service park at the Nürburgring, the ID.R is supplied by two fast-charging systems that operate with a comparatively low power output of 90 kW each. “As a result, the heat generation remains low, even though the batteries are completely charged within only about 20 minutes,” explains Bertram.