BMW, Daimler developing wireless recharging system

BMW, Daimler developing wireless recharging system

BMW-iwallbox-CSUV-pic

BMW and Daimler have announced joint plans to develop a wireless inductive charging system for plug-in hybrid and electric vehicles.

The high-voltage batteries can be recharged quickly and easily by means of the BMW i Wallbox that forms part of the 360° ELECTRIC portfolio.

Although there is no set date as to when the technology will arrive in Australia and New Zealand, the plan is to see it launched onto the market in the mid term. The system will consist of a floor-mounted base plate and an extremely lightweight charging coil at the bottom of the car.

The crucial advantage of inductive power supply over conventional charging stations is the cable-free connection between the supply point and the vehicle’s high-voltage battery.

The system consists of two components: a secondary coil in the vehicle floor as well as a base plate with integral primary coil that is located underneath the car, for example on the garage floor. The arrangement of the coils, and consequently of the field pattern, is based on a design derived from their circular shape that offers a number of crucial benefits.

These include the very compact and lightweight construction along with effective spatial confinement of the magnetic field. The electrical energy is transmitted via an alternating magnetic field generated between the coils, contact-free, without charging cables and at a charging rate of 3.6 kW.

With an efficiency factor of more than 90%, this method enables the high-voltage batteries in vehicles to be charged efficiently, conveniently and safely.

The inductive charging facility can be used regardless of the weather conditions. Not even rain or snow has a negative effect on the power feed as all of the system’s conductive components are protected, which means the primary coil can even be installed outdoors.

During charging, ambient electromagnetic radiation is also kept to an absolute minimum. The space between the primary and secondary coils is permanently monitored, allowing charging to be halted instantly if any foreign bodies are detected.

As with today’s BMW i Wallbox, the inductive power supply systems of the future will also make it possible to activate and monitor the charging process from a smartphone. The relevant smartphone app will let drivers call up the data transmitted online on the battery’s charge status, for instance, or the time remaining until charging is complete.

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