Bosch Begins Production of 800V Inverter for EVs


Bosch has begun production of a new powertrain solutions system based on 800-volt technology. The higher voltage tech is expected to improve battery recharge times and boost electromobility. The 800-volt inverter uses silicon carbide semiconductors to increase efficiency, which can improve range as well.

The units, which have increased power density and reduced weight, are more compact in design than their previous lower-voltage counterparts. Bosch says one automaker (unnamed) is already on board with the 800-volt system. The Bosch system effectively doubles the output of the current standard 400-volt systems.

The 400-volt standard limits power charge input to 250 kW. With an 800-volt system, that could theoretically be doubled. Improved semiconductor conductivity in the Bosch system, attained by introducing carbon atoms into the crystalline structure of the silicon, means a 50 percent reduction in heat losses. Inverter efficiency is improved by up to 99 percent as a result.

The standout features of the 800-volt variant of the Bosch electric motor now going into volume production are 830 Nm torque and 460 kW output. By using I-pin bar winding, the motor’s efficiency, compactness, and level of automation in production can be further improved. This new system delivers 35 percent more power density at 60 kW/kg. The next-generation of the motor being used, Bosch says, will introduce oil cooling to further improve efficiency and long-term power outputs. Especially important in heavier vehicles in the commercial realm.