The series development of the BMW i7 is entering its final phase with a test programme under extreme road and weather conditions, in which the electric motors, all-wheel drive and high-voltage battery have to prove their performance and reliability under maximum load - currently in hot-land testing.
This hot-land testing takes place on test tracks and public roads all over the world - during which, according to BMW, the development engineers "primarily verify the performance and reliability of the electric motors, the all-wheel drive and the high-voltage battery under maximum stress from high temperatures, unpaved roads, dust generation and large differences in altitude".
This also involves mountain driving with trailers, for example. Another extreme scenario for energy management and power electronics: a downhill drive with a fully charged traction battery that can no longer absorb recuperation energy.
The endurance tests in the heat are not only intended to test the powertrain components - fundamental errors so close to launch would be an enormous challenge - but above all to safeguard them. The components of BMW's fifth-generation e-drives have already undergone numerous test drives and are already used in the iX3, iX and o4. Nevertheless, it must be checked anew for each vehicle model whether the respective arrangement of the components also provides cooling and durability - hence the tests at extremely high outside temperatures, permanent sunlight and dryness.