Lithium & The Future, page-93

Wireless charging and discharging for electric vehicles



In the future, a wireless charging system will allow electric cars not only to charge their batteries, but also to feed energy back into the power grid, helping to stabilize it. The cost-effective charging system achieves high levels of efficiency across the whole power range, from 400 watts to 3.6 kilowatts, while the car and the charging coil can be up to 20 centimeters apart

In the future, a wireless charging system will allow electric cars not only to charge their batteries, but also to feed energy back into the power grid, helping to stabilize it. The cost-effective charging system achieves high levels of efficiency across the whole power range, from 400 watts to 3.6 kilowatts, while the car and the charging coil can be up to 20 centimeters apart. Fraunhofer researchers are presenting their prototype from September 15 to 18, 2015 at the IAA International Motor Show in Frankfurt (Hall 4, Booth D33).

When it’s pouring rain, a driver who has to connect a thick, unwieldy cable between their electric car and a charge spot is sure to get soaked to the skin. But sometimes there’s no alternative – the battery is empty. Using wireless inductive systems to charge the car is much more convenient. This involves transmitting energy through the air, or, more precisely, through a time-varying magnetic field. The technology is essentially based around two coils, with one built into a road, a parking space or a garage, and the other fitted to the underbody of the car. In conjunction with suitable capacitors, these coils form a sort of resonant "antenna system for energy transfer." The nearer the two coils are to each other, the more efficiently the energy is transferred.

http://www.sciencedaily.com/releases/2015/09/150901114153.htm