StoreDot sees no additional cell ageing after fast-charging
StoreDot had already reached the milestone of 1,000 cycles (with 80 per cent of the original capacity) for its production-ready pouch cells in October 2022 and had the result confirmed by an independent laboratory in December 2022. However, the tests at that time took place under laboratory conditions.
The current tests were also conducted in the laboratory, but are intended to “mimic real-world use cases”, according to the company. Specifically, the cells were charged slowly in the charge stroke from zero to ten per cent, quickly in the stroke from ten to 80 per cent (within ten minutes) and from 80 to 100 per cent again with a charge rate of 1C.
For comparison, identically constructed cells were only charged slowly from zero to 100 per cent. This should correspond to the “usual use case of charging level 1 or 2”, according to the company. Level 1 in the USA is AC charging with 120 volts (usually only 1.2 kW charging power), Level 2 uses 240 volts – here up to 19.2 kW are possible.
Even when fast charging was applied within ten minutes for 70 per cent of the total charge, these cells are said to have shown “no additional degradation”, to be on a par with the slowly charged cells.
The company therefore sees itself confirmed in its approach to developing extremely fast-charging batteries. “This remarkable accomplishment underscores our commitment to developing cutting-edge technology that is not only extremely fast but also highly durable,” says StoreDot CEO Doron Myersdorf. “The tests safely delivered the charging speed that consumers demand with the best range, whilst preserving the longevity of the vehicle’s battery cells — a crucial combination in reducing users’ anxiety for achieving widespread adoption of EVs.” The tests had shown that the battery was robust “regardless of drivers’ charging habits, recharging frequency, or charger power”.
The company’s partners are Mercedes-Benz, Volvo Cars, Polestar, Ola Electric and VinFast.