Researchers at Oak Ridge National Laboratory (ORNL) have made a big breakthrough in wireless charging for electric vehicles (EVs). They successfully demonstrated a 270-kilowatt (kW) wireless power transmission system, setting a new standard for EV charging. Collaboration with the Volkswagen Group made this achievement possible. So, they wirelessly charged a Porsche Taycan, marking a major step forward for the EV industry.
A few months ago, ORNL set a record with a 100-kW wireless charger. So, this new 270-kW system surpasses that record and overcomes the challenges of using high-power wireless charging into light-duty vehicles like the Porsche Taycan. These vehicles often face limitations in space, weight, and volume.
Innovative Design for High-Power Wireless Charging
The key to this new technology lies in its innovative design. The system uses lightweight electromagnetic coils, each about 19 inches in diameter, to achieve the high power density needed for effective wireless charging. They adapted these coils, originally used in small electronics, to meet the higher power demands of electric vehicles.
The coils create magnetic fields, which enable the efficient transfer of high power levels. As a result, the system can maintain over 95% efficiency and can provide a 50% charge to a car in just 10 minutes, even with a 4.75-inch gap between the coil and the ground.
Ensuring Efficiency and Safety
The 270-kW wireless charging system is equipped with important safety features to ensure it operates safely and reliably. It includes components that prevent overheating, short circuits, and exceeding voltage and current limits. The system automatically shuts down if there is a power failure or other operation.
ORNL and Volkswagen are continuing to work together beyond this 270-kW system. They are developing a polyphase system with a lightweight enclosure that enhances the system’s magnetic, electrical, thermal, and mechanical performance, aiming to make wireless charging more efficient for home use.
The Future of EV Charging
Over the past decade, ORNL has been at the front of wireless charging technology. They have got significant milestones, such as transferring 20 kW to an SUV in 2016 and testing 120 kW in a lab by 2018. The recent 270-kW system demonstration is the first time ORNL’s polyphase technology has been used in a real car, marking a major advancement in EV charging capabilities.
The goal is to make EVs more convenient and accessible for a wider range of users. Wireless charging technology is evolving to support this. Burak Ozpineci, ORNL’s corporate fellow, leads vehicle and mobility systems research. So, he envisions a future where EVs can recharge quickly, like making a brief stop at a store.
Looking ahead, Volkswagen and ORNL plan to further develop and improve the 270-kW system, making it more affordable and user-friendly. This progress aligns with the Department of Energy’s goal of getting fast-charging, where EVs could receive up to 300 kW of power in 15 minutes or less.
Final Takeaway
The 270-kW wireless EV charger demonstration is a major milestone. It marks a step forward in getting faster, more efficient, and more easy electric vehicle charging. ORNL and its partners continue to research and collaborate on this technology. Their efforts aim to make EVs a more promising and practical choice for drivers around the world.
