English Portal - Electric Vehicle: CEA and Renault Group are developing a highly efficient bi-directional on-board charger

What if the vehicle becomes a pillar of the electric grid? This is the principle of V2G, or vehicle-to-grid, a two-way exchange technology that will soon allow Renault cars to recover part of the electricity stored in the batteries to improve grid operation and compensate for the intermittent nature of renewables. energies.

Sur ce sujet, et pour aller encore plus loin, le CEA, acteur mageur de la recherche, et Renault Group, pionnier and expert in electric electrique, travaillent déjà sur les futures generation of ces V2G technologies who will run the end of the line Contract. To this end, CEA and Renault Group jointly developed
New electronic architecture of the transducer Built directly into the car charger. The result of nearly 3 years of research and being the subject of 11 popular patents, this power inverter* developed from innovative materials and more compact will reduce power loss by 30%, improve vehicle charging time and battery life. Better yet, it will be on top of everything
Bidirectional By storing energy from the electrical grid.

Innovative materials

The CEA and Renault Group R&D teams have combined their expertise in the field of integrated power electronics, in particular
The so-called “Grand Gap” semiconductor materials, whether in gallium nitride (GaN) or silicon carbide (SiC). The result: the new component-based architecture “Grand Gap” makes it possible to do just that
Reduce energy loss by 30% During the conversion, thus heating, which facilitates the cooling of the conversion system.

Reduced magazine size

In addition, the work of engineers to optimize active (semiconductors) and passive (capacitors and inductively wound components) has enabled
Low loader volume and cost. Thanks to the use of ferrite material, intended for high frequency, and an injection molding process called “Power Injection Molding”, the transformer is more compact.

towards more performance

This new adapter architecture provides a
load capacity up to 22 kW
in three-stage mode, making it possible to charge your car more quickly while ensuring battery durability. as allowed
The charger is bi-directionalFor example, the energy stored in the battery can be fed back to the grid or used to supply the energy needs of an independent home, provided the latter is specially equipped with a two-way meter. The solution is EMC compliant for networks and the vehicle.

This project with CEA exceeded our expectations by confirming the ability to achieve the expected performance in terms of efficiency and compactness. It opens up a strong frontier around power electronics that poses a real challenge in an electric vehicle to make the most of the batteries’ capabilities. With two-way charging, the vehicle is at the service of the electric grid and allows the end consumer to reduce energy costs. Jean-François Salesy, Group Renault Director of Advanced Engineering

We are proud to support the Renault Group in this development. We’ve been able to combine Renault Group’s systemic vision on vehicle electrification and powertrain, with our teams’ skills in transformer structures and components; In the end, we have implemented an architecture that adapts to needs and has a high added value. » Sebastien Dufy, Director of CEA’s Leti Institute.

The use of innovative materials with joint patents between the Renault Group and CEA on the charger made it possible to manufacture the custom adapter, which is an essential building block in this type of development, as it allows volumes to be reduced with performance that exceeds state of the art. » François Legland, Director of CEA’s Liten Institute.

* A transducer is an electronic device, which is placed between the source of electrical energy and the supplied load, which makes it possible to adapt the source to the load and to control the transfer of energy from one to the other.

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