Tesvolt joins Stercom on inductive charging

German specialist for Lithium battery storage for industry and commerce, Tesvolt, has now become a shareholder of Stercom Power Solutions, a German first mover in inductive charging. The two companies want to drive forward the wireless charging of electric cars, buses and trucks. The goal is “inductive supercharging” at 200 kW.

Tesvolt has not yet revealed further details about the exact amount of the investment and the shares. What is clear, however, is that commercialisation is planned “soon”. The company says it has found solutions to “previously unsolved questions” such as a sufficiently strong charging power and the correct parking position above the magnetic coil.

Daniel Hannemann, founder and commercial director of Tesvolt claims that “So far the only wireless charging suitable for mass-production has just 3.2 kW,” which is roughly equivalent to single-phase AC charging with low charging power. Here it must be said that emphasis should be put on “mass-production” since projects have already been underway for some time with inductive charging for commercial vehicles. Already back in 2018, the inductive charging system specialist Momentum Dynamics from the USA installed their first wireless charging system for electric buses with a charging capacity of 200 kW which was used for the Link Transit company in Wenatchee, Washington.

“We want to launch an inductive charging station with a charging power of 44 kW” Tesvolt’s Hannemann explains. “Stercom’s silicon carbide technology allows very efficient energy transmission with 95 per cent efficiency – even with a distance of up to 20 centimetres between the transmitter and receiver coils, something no other supplier on the market can do so far.” Tesvolt charging stations will include intelligent software that shows drivers the correct parking position above the solenoid coil.

If inductive charging stations become widespread enough, Stercom founder Robert Sterff says the technology could also make electric cars more sustainable. “The many small charging processes make large car batteries unnecessary, and the batteries only need to be about half the size,” Sterff says. “That makes electric cars much cheaper and also lighter, so they’re also more efficient.”

That being said, short charging processes with high power also place higher or different demands on the car battery meaning that high cycle stability would then be more important. “A lot of research is going on in Germany on solid-state batteries, which are particularly well suited for this,” Sterff says.

Simon Schandert, founder and technical director of Tesvolt, has announced the next stage of development. “Our goal is to jointly bring highly efficient charging systems to the market and, in the medium term, even enable inductive supercharging with up to 200 kilowatts of charging power. This would also make charging while driving efficient in the future.”

The two companies have not said when they expect the inductive 44-kW charger or the 200-kW variant to be launched on the market and simply refer to a BMW forecast that predicts nationwide inductive charging by 2030. Tesvolt points out that inductive charging is still very much emerging technology. In Germany, the corresponding DIN standard 61980-1 “Contactless energy transfer systems for electric vehicles” is still under development, and points surrounding the billing of wireless charging processes are also open. That being said, China has set a national standard for wireless charging of electric vehicles based on technology from US company WiTricity. The inductive charging specialist has worked closely with the GB standards committee on several technical issues, including efforts for harmonisation.

Tesvolt points out that test routes with magnetic coils under the asphalt are already in place in countries like Sweden, France and Italy. Indeed, in Italy in May this year, ElectReon Wireless, announced that it will provide its technology to charge two Stellantis vehicles and an Iveco bus while driving in Brescia, Italy, as part of the Arena of the Future project.

Stercom founder Robert Sterff says: “We have already delivered inductive technology for international car manufacturers, and vehicles are in the test-run phase around the world,” says Sterff without giving further details of these test phases or manufacturers, which will be eagerly awaited.


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