Ultracapacitors were sometimes spotted in start-stop applications, but Geely intends to extend the use of ultracapacitor subsystems to hybrids and plug-in hybrids.
The deal already envisions five models equipped with Maxwell's ultracapacitors in North America and Europe. The first one will go one sale in late 2019.
Having an ultracapacitor subsystem will enable higher power charging/discharging, which is good for both regenerative braking and acceleration. Usually, small battery packs were constrained by power output.
If ultracapacitor subsystems take high power demand on its own, battery packs could consist of low-power, high-energy dense lithium-ion cells for improved all-electric range.