"The participation of new investors in Ionity is a clear signal of trust indicating the work of our young company is already bearing fruit," chief executive Michael Hajesch said.
No financial details were disclosed about Hyundai Motor's involvement.
The announcement comes days before the Frankfurt Auto Show IAA, where sustainable driving and electric cars will take centre stage. Volkswagen will display its ID 3 electric vehicle, Porsche its Taycan electric sports car, and Mercedes-Benz its fully electric van.
Car makers are pouring much of their cash into developing electric vehicles, while energy providers hesitate to take on responsibility for the rollout, as long as electric car sales remain too low to provide a profitable customer base.