How to recharge the electric car on the move?
Remember our story on the wireless charging of electric vehicles Hevo Power, the power transmission through the resonant electrodynamic induction? It is assumed that the charging stations will be disguised as manhole covers: car batteries will be able to replenish energy during parking.
But researchers from the University of North Carolina (USA) are developing technology that will allow electric vehicles to wirelessly feed directly on the move.
The system uses a segmented induction coil creates an electromagnetic field when receiving ac. In the car are encouraged to place a coil of exactly the same size as the ability to catch the electromagnetic field, converting the received energy into direct current for charging the battery. Identical dimensions of coils for transmitting and receiving sides – a guarantee of greater efficiency.
To further optimize the development required to modify the receiver in such a way that when it enters a certain zone of the transmitter magnetic field increases the latter by 400 %. The transmitter returns to normal operation as the removal of the receiver.
The current prototype of the system in peak mode allows transmit power of 0.5 kW. Now, researchers are working on an enlarged version of the complex, which will be able to transfer up to 50 kW, which will make it more commercially attractive.
In addition to efficient recharging electric vehicles require another key component, without which they cannot be exploited – the battery pack. Many cars on electricity used lithium- ion batteries for the reason that these power supplies have a high energy density, low self-discharge, no maintenance and have almost no memory effect.
The improved performance of lithium- ion batteries will be engaged in the project participants Li-EcoSafe, a joint initiative of the German Aerospace Centre, the Centre Solar Energy and Hydrogen Research Baden- Wurttemberg and the University of Ulm (all – Germany).
It is expected that the initiative Li-EcoSafe will help in the development of new materials to create a more effective and safe in the use of batteries. In addition, research will be carried to change the structure of the electrode surface for optimum performance.
All prototypes will be carefully and thoroughly tested. For the most accurate measurement of indicators such as the voltage and capacity loss, researchers will require innovative methods and instruments. Removal of indicators will be held during the battery while the computer simulation of their internal structure.