The world’s fastest wireless EV charger unlocks 100kW parking spaces

A new wireless EV charging station can fill a car’s battery as efficiently as a wired plug, with a groundbreaking 100 kW of power. This unlocks the possibility of fast, efficient and super convenient charging by simply parking in a designated spot.

Wireless energy transfer was first demonstrated in the 1890s by a man named Nikola Tesla. Nowadays it is quite common in many homes, where many people use wireless charging pads for phones, tablets and electric toothbrushes, as well as inductive cooktops. Power is transferred from the charger to the device through the interaction of electromagnetic fields, and what was once dark magic is now considered a safe, easy and efficient way to get the job done.

However, it hasn’t really taken off in the EV world yet – largely because energy levels have kept things completely out of the realm of fast charging. For example, according to Verified market reportsOne of the fastest commercially available wireless EV pads is the 12 kW jobbie from Hevo. That’s better than a plug; it’s a Level 2 charging speed and would give you about 42 miles of driving per hour with an average-efficiency EV (3.5 miles/kWh, or 5.6 km/kWh). But it’s certainly not what you’d expect from a commercial charging station.

That’s why a new solution announced by Oak Ridge National Laboratory (ORNL) looks promising.

ORNL researchers say they have demonstrated the fastest, most powerful wireless EV charger ever, in a “lightweight polyphase electromagnetic coupling coil design” that transfers power more than eight times faster than the Hevo pad, enough to drive the same car about 550 miles driving (563 km) charging in one hour.

The coil, measuring just over 14 inches in diameter, represents the fastest wireless charger ever tested with a vehicle
The coil, measuring just over 14 inches in diameter, represents the fastest wireless charger ever tested with a vehicle

Genevieve Martin/ORNL, U.S. Department of Energy

A receiver coil was mounted on a Hyundai Kona EV, which was parked above a 14-inch diameter polyphase transmitter, with a five-inch air gap between them. The system was measured at 100 kW, with an efficiency of 96% – comparable to what you would get from a very good cable and plug. The researchers note that conventional coil technology transferred a power of 120 kW in a laboratory test, but say this is the best ever tested on a car – and that the multi-phase coil design allows the highest power density within the smallest possible coils. , which makes for a relatively compact and convenient system.

“We have achieved the highest power density in the world for a wireless charging system for this class of vehicle,” ORNL’s Omer Onar said in a press release. “Our technology achieves a power density 8 to 10 times higher than conventional coil technology and can increase battery charge status by 50% in less than 20 minutes… This is a breakthrough achievement and opens the door to fast and efficient wireless charging for electric passenger cars. ”

Of course, for any wireless charging solution – including those embedded in the road surface – to gain real momentum, a lot of things need to happen, starting with automakers establishing standards and building the receiver coils and charging equipment into their vehicles. It’s a bit of a chicken-and-egg situation; Few manufacturers assemble the coils because few companies build the infrastructure at scale, and vice versa.

But it seems like something both parties want to achieve. Perhaps Tesla is the company that makes this possible, as it operates on both sides of the fence, developing both the vehicles and its own fast-charging network. And indeed, it is in the making, he said Energy is important.

We will see! But the technology certainly seems capable of making wireless EV charging relatively fast and efficient, even if it’s not yet ready to challenge the fastest wired connections in the EV charging world.

Source: ORNL

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