Deal targets 200kW wireless charging road technology
German energy storage system developer Tesvolt has signed a strategtic invested deal with a company developing technology wireless charging for electric vehicles as they drive along.
The deal with Stercom Power Solutions aims to accelerate inductive wireless charging of electric cars, buses and lorries up to 200kW. Test routes with magnetic coils under the asphalt are already in place in Sweden, Isrel, Italy and France and BMW has predicted blanket coverage of inductive charging by 2030
“Our aim is to work together to bring highly efficient charging systems to the market and even in the medium term to enable inductive supercharging with up to 200 kW charging power. This would also make it more efficient to charge while driving in the future,” said Simon Schandert, founder and Chief Technical Officer at Tesvolt.
Tesvolt specialises in developing energy storage systems based around prismatic lithium battery cells from Samsung SDI combined with a patented and TÜV-certified Active Battery Optimizer (ABO) smart cell control system. The system are built series at a gigafactory in Wittenberg.
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Wireless charging involves transferring electrical energy in an inductive process from a magnetic coil in or on the floor to a receiver coil in the electric vehicle. This allows for many short but high-speed charging processes – for example on shopping centre forecourts, in multi-storey car parks as well as at home. Car makers like Audi and BMW are already installing charging coils in new vehicle models.
Having inductive charging via the road would allow smaller battery packs in a vehicle, reducing the weight ad boosting efficiency without having range anxiety.
“So far the only wireless charging suitable for mass-production has just 3.2 kW. We want to introduce an inductive charging station to the market with a charging power of 44 kW, which means charging 14 times faster,” said Daniel Hannemann, founder and Commercial Director at Tesvolt. “The marketable silicon carbide technology from Stercom works at 95 percent efficiency to permit a highly streamlined energy transfer – and a distance of up to 20 cm between the sender and receiver coils, something no other provider on the market has been able to do.”
The charging stations will also contain intelligent software which shows the driver the right parking position for the vehicle over the magnetic coil.
“Short and frequent charging dispenses with the need for large car batteries, given that the batteries only need to be around half the size. This significantly lowers the price of electric vehicles while making them lighter and therefore more efficient,” said Robert Sterff, founder and CEO at Stercom. Short and powerful charges do however place high demands on car batteries. “In Germany there is lot of research being done into solid-state batteries, which are particularly well suited for this.”
There are still some other challenges when it comes to inductive charging including how to pay, and the applicable DIN standard 61980-1 for Electric vehicle wireless power transfer systems is still in the development stage.
“We have already delivered inductive technology for international car manufacturers, and vehicles are in the test-run phase around the world,” said Sterff.
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