BMW Working on Wireless Charging Technology

BMW has making progress on an inductive charging method of its high voltage batteries of their BMW i cars. The future plug-in models has advantage to be a cable-free connection between the supply point and the vehicle’s high voltage battery.

BMW Group has signed an agreement with Daimler AG to make the joint development and implementation of a standardized technology for inductive charging of electric cars and plug-in hybrid vehicles. It will consist of two components – a secondary coil in the vehicle floor as well as a base plate with integral primary coil located underneath the car. Both carmakers have promised to broaden their range of electric vehicles

It will consist of two components – a secondary coil in the vehicle floor as well as a base plate with integral primary coil located underneath the car. Energy is transmitted through contact-free alternating magnetic field generated between the coils and will charge the battery at 3.6 kW.

For the future, there is also the possibility of increasing the charging rate to 7 kW, ensures that BMW i3’s battery could still be fully charged overnight when using the inductive system.

BMW had already worked on contactless charging in a previous partnership with Siemens AG, testing prototypes in Berlin in 2011. Fulton Innovation, a unit of Alticor Inc., also showed the technology that year on Tesla Motors Inc.’s Roadster electric model.

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