Seems like AFS Trinity tried it 24 years ago and nothing has been released so far that makes use of the concept.
Is there something like a combustion engine running at a sweetspot to charge ultracapacitors with a buffer battery (something like the UltraBattery concept)?
I’ve recently read about the Nissan Range-Extender concept but milage still is quite bad.
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Ultracapacitors are terrible at storing large amounts of energy, compared to batteries.
They’re very good at charging/discharging quickly, and going through lots of cycles, but at best they can only hold something like 1/300 to 1/1000 of the energy that an equal weight lithium battery can.
Range extension requires storing a lot of energy…batteries are reasonable for that. Hydrocarbons are extremely good. Capacitors are awful.
A 400F supercap holds about 1/20th the energy of a single AA battery. Whilst being both heavier and larger. That probably answers your question.
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