Bidirectional inductive building integration of quasi-stationary battery storage from battery-electric vehicles


Motivation and approach

If the proportion of electricity generated from renewable sources (e.g. from photovoltaics), for example for charging battery-electric vehicles and for supplying smart homes with electrical energy, should be increased successively, energy storages are necessary for bridging doldrums (e.g. due to cloud cover). If the target of 1,000,000 electric vehicles issued by the German Federal Government in 2009 is achieved on Germany's roads, a total of 20 GWh will be mobilized for an average energy content per e-vehicle battery of 20 kWh. On average, a vehicle parks about 23 hours a day, so that the use of traction batteries of e-vehicles as quasi-stationary buffer storage for renewable electricity (e.g. smart homes) would be ideal.

Research goal

The project "Drahtlos" has the goal of researching an intelligent wireless (inductive) connection of e-vehicles to smart homes, to develop the hardware and software required for this purpose and to test the entire system in field trials. Current publicly funded R&D projects that work on inductive power transmission in the field of electromobility deal exclusively with charging technology. Therefore, a smart inductive interface (hardware / software) between the vehicle and smart home is being developed for bi-directional electrical energy interchange (i.e., combined charge / discharge). It will be capable of inductively charging and discharging traction batteries, so that they can also serve as quasi-stationary home storage devices for the storage of electricity from renewable energy sources, if required. On the battery side, control algorithms for the optimized energy flow between e-vehicle and smart home are being researched, which will enable gentle battery cycling without loss of service life. The interface is designed in such a way that there is a high degree of security and only approved users are allowed for energy flows between the house and the vehicle. In addition, all (quasi) stationary energy storage devices and inductively coupled components considered in the project will be able to communicate with each other via a software interface and enable an energy flow between all involved parties.

The interface is coupled with a human-machine interface, which is developed in the form of an Android app. It will provide users of the developed inductive energy transfer technology with information and intervention options at various levels.

Research and project partner

  • B2M Software AG
  • AUKOS GmbH
  • Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung
  • NEXT ENERGY - EWE-Forschungszentrum für Energietechnologie e. V.

This project is funded by the Federal Ministry for Economic Affairs and Energy (BMWi).


01.01.2016 – 31.12.2018

Project number


Project sponsor

Projektträger Jülich (PtJ) | Forschungszentrum Jülich GmbH



Max Busch

E-Mail: max.busch@e-go-mobile.com