Japanese Technology Could Allow Electric Vehicles To Drive Unlimited Distances

A road that charges electric cars has long been a pipe dream for combating range anxiety, but Japanese scientists are making it work in real life.

It’s a well-known shortcoming of electric cars that they can only be driven short distances. The Chevy Volt, for example, has a maximum range of fifty miles on a single charge. And, while it’s possible to back up the electricity system with a fossil fuel-based one, as the Chevy does, that takes away from the point of having an electric car in the first place.

Researchers at Toyota Central R&D Labs and Toyohashi University of Technology have come up with what they think is the world’s first mid-drive charging system, based on a similar mechanism that allows trains to travel under overhead wires.

Under the still-experimental system, electrified metal plates are buried under roads, which "up-convert" energy via a radio frequency to a steel belt inside a car’s tires, as well as to a plate sitting above the tire.

Although testing of the system has only involved low voltages so far, the researchers say the system could allow electric cars to be far lighter than they are today. The electric cars would need smaller battery packs, as they would only need to get to and from the electrified highways.

Anything to reduce the weight of today’s electric car batteries would be a good thing, potentially saving energy and conserving limited lithium supplies. The Chevy Volt’s battery assembly weighs a not-insubstantial 435 pounds, and measures 3.5 cubic feet.

There are obvious concerns about dangers to the public from stepping on an electrified metal strip, and some question the viability of digging up large stretches of road to install the infrastructure, but the idea does have precedents. Boston’s Logan Airport, for example, has ordered sixty "Online Electric Vehicles" that operate under a similar principle, and were developed by the Korea Advanced Institute of Science and Technology.

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