Just a concept for now: At the LA Auto Show, Audi unveiled the A7 plug-in hybrid fuel cell electric vehicle.The ‘h’ in h-tron stands quite obviously for hydrogen.

By plugging this vehicle into an AC power supply, the 8.8 kWh batter pack can be charged up enough to provide around 31 miles of all-electric driving. Once the battery pack’s charge is depleted, the hydrogen fuel cell kicks in for an additional 310 miles of range.

The A7 H-tron is propelled by 2 electric motors, each one providing 85 kW of power, and even up to 114 kW when the voltage is temporarily raised, to each axle. Peak torque is 199.1 lb-ft per electric motor. With these 2 motors, 0-60 mph time is 7.9 seconds, and top speed is 130 mph.

The electric motor housing incorporates a planetary gear train with a single transmission ratio, as well as a mechanical parking lock and a differential function.

The fuel cell consists of over 300 individual cells that together form the stack. Each cell has a polymer membrane with a platinum based catalyst on each side of the membrane.