Bidirectional charging management for electric cars

November 08, 2019 //By Christoph Hammerschmidt
R&D project develops bidirectional charging management for e-cars
A consortium with BMW is now exploring ways to use bidirectional charging to link renewable energy networks with the traction batteries of electric vehicles

The bidirectional charging management project (BDL) will see companies and institutions from the automotive, energy and scientific sectors jointly developing technological solutions with which electric mobility can become more comfortable for users, cheaper and with lower emissions. The aim of the interdisciplinary project partners is to link vehicles, charging infrastructure and power grids with each other in a holistic approach in such a way that the most comprehensive possible use of regeneratively generated energy is promoted and at the same time the security of supply is increased.

The bidirectional charging capability enables electric vehicles, when connected to a charging station or wallbox designed for this purpose, not only to take up electrical energy for the high-voltage battery, but also to feed it back into the power grid in the opposite direction. The batteries of the electric vehicles thus become mobile energy storage units that can also supply electricity if required. Such an integration of electric vehicles into the power grid requires a series of innovations in the areas of vehicle technology, charging hardware, charging management and communication interfaces to energy industry stakeholders as well as with regard to legal framework conditions. These are created as part of the research project in which, in addition to the consortium leader, the BMW Group, Kostal Industrie Elektrik GmbH (development of charging hardware), the transmission grid operator TenneT and the Karlsruhe Institute of Technology (KIT; research on electricity market and grid repercussions) are also involved.

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