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BMW Electric Vehicle Wireless Charging

10.07.2014

The German company BMW Group announced the development of wireless chargers for electric and hybrid vehicles. In terms of the speed of charging car batteries, the new technology will not be inferior to cable counterparts, but will surpass them in terms of ease of use.

The BMW range includes two vehicles with electric powertrains: the BMW i8 hybrid sports car and the pure electric BMW i3. They are charged using the proprietary BMW i Wallbox system, which is installed by the manufacturer in the buyer's garage with subsequent after-sales service. The equipment is connected to a regular household network and is equipped with additional solar panels to save electricity.

BMW has gone further and is going to use a contactless way to power car batteries. The system developed by the company involves the installation of inductive equipment in the garage floor or other surface that a car can drive on. An induction charging station with a power of 3,6 kW excites a secondary coil mounted in the bottom of the electric vehicle. The energy is converted into direct current, which charges the batteries.

BMW claims the prototype system is 90% efficient and can wirelessly charge the BMW i8 batteries to full capacity in less than two hours. The developers plan to increase the power of the charging station to 7 kW, which will significantly speed up the process of charging plug-in hybrids and electric vehicles.

All conductive components of the system are hidden, so it can be installed outdoors. The generation of an electromagnetic field is not dangerous for humans, since it occurs only when a car appears above the charging platform. If a foreign object gets between the primary and secondary coils, the system will automatically shut down.

It will be possible to control the charging station using a smartphone via a Wi-Fi connection: on the screen of a mobile device, the car owner will see not only the charging status and the remaining time, but also the optimal position for parking above the charging plates.

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