BMW and Daimler have entered into an agreement to develop wireless charging systems for their electric cars.

According to, once developed, the system will charge the battery in cars at a rate of 3.6kW. The companies plan to increase this rate to 7kW, which will enable the battery of BMW's i3 to be fully charged overnight without the need to plug in.

The inductive charging system will operate between two electromagnetic coils. One coil will be located underneath the car, while the other will be attached to the floor of the car. After the two coils are suitably lined up, charging can be initiated at the touch of a button.

BMW said that the system is over 90% efficient and safe. In future, EV owners will be able to manage the charging through a smartphone app.