The cars were originally revealed at the 2015 Geneva motor show. Just before this year’s show, the now road-registered Quantino was driven non-stop for 14 hours on one ‘charge’ — an impressive feat for an electric car.
Now, in a test drive at the TCS test track near Zurich, Switzerland, Autocar has seen for itself that the liquid-battery technology works.
‘Redox’ liquid batteries like this were invented in the 1950s and improved by NASA in the 1970s, but the much greater energy density through single-use electrolytes is Nanoflowcell’s breakthrough.
That density, in energy stored per litre of fuel, is still far short of diesel oil at 600 watt-hours versus 10,000, but whereas a diesel engine loses up to 80% of its energy as heat, the Nanoflowcell system is claimed to be more than 95% efficient.
The Quant FE is a four-seat, supercar-shaped machine with an electric motor at each wheel, producing a total of 2140lb ft of torque. This is needed to pull its hefty weight, totalling 2300kg if the two 250-litre tanks are full of the ‘bi-ION’ electrolytes.
However, the smaller, 2+2 Quantino is a much more significant car. As driven by Autocar (below) with two 159-litre tanks, good for a claimed range of more than 600 miles, it weighs 1420kg. A possible production version would have two 85-litre tanks and weigh 1045kg, filled. Its single Bosch motor, driving the rear wheels, runs on just 48V rather than the usual hundreds of volts in an electric car.
“This makes the car safer and easier to homologate,” said La Vecchia. “People told us it was not possible to have this much power with 48V, but we have proved that it is.”
With low voltage comes the need for high current, up to 300 amps, which normally needs thick, heavy cables. However, here they are thin, thanks to the use of patented step-up and step-down systems at the beginning and end of the cables.
How it works
The Nanoflowcell system powers a car’s electric motor, or motors, by means of ion exchange between a positively charged liquid and a negatively charged one. The liquids — mainly water carrying an as yet undisclosed mix of organic and inorganic salts (“engineered by nanotechnology”) as an electrolyte — are kept in separate on-board tanks and circulated by pumps into the flowcell, in which a semi-permeable membrane, like a fuel cell’s, keeps the liquids separate while allowing ions within them to cross. This creates an electric charge at the membrane.