Honda has had two systems, the earlier “IMA” system which is a mild parallel hybrid. And the current “E-drive” system which is primarily a series hybrid. Series hybrids are actually pretty old tech — it’s how diesel locomotives works. The Chevy Volt also works just about the same way.
Also how azipods work on some very large ships, the diesel locomotive concept scaled up even more, sometimes with big gas turbine for power generation.
