TimeHorse wrote:Of course, I will admit that if the LEAF has a 80kW motor and I assume for the LEAF the regenerative component would simply be turning the electric motor into a generator, I guess there's no way to recover more energy anyway, at least here.
Leaf regen is limited to 30 kW max (about 1C) - presumably to preserve battery life. And as documented the amount of regen when the SOC is above 80% starts tapering off until there is none at 100% charge. So presumably, a series super-cap should allow one to increase regen up to 80 kW (max of the motor). If the super-cap had a capacity of 0.5 kWh, that would take about 20 seconds to charge to full from empty - more than enough to capture all the energy required to stop from any reasonable speed at a regen rate of 80 kW.
TimeHorse wrote:As someone said, this may be a better issue for the hybrids, depending on how their configured. It's really a question of how the Regenerative Breaking is configured.
Definitely - combined with the typically low capacity of the hybrid pack (a couple kWh at most) which also limits max charge/discharge rates, even a small super-cap of a couple hundred Wh should significantly improve efficiency.
The big question is: at what cost/weight/complexity penalty? I suspect that in most cases it's more cost effective to simply increase the size of the pack a bit which will allow you to increase the power rating of the pack itself while not increasing the load on individual cells.
BTW - a lot of the previous discussion of maximum regen amps is not too informative unless we also know the voltage and capacity of the cells in question...