There was quite a bit of discussion on this several years ago on the old Yahoo Groups Thundersky site and others for the stated reason - to supply drive/absorb regen current spikes. Also research done and papers written on it in the EU. The conclusion was as David said, better to just add more cells. There is no real weight savings (with Lithium cells) since many supercaps are required. They are also costly. They are low voltage so a high power DC/DC converter was used in the research articles, adding another cost. There was also a U.S. company on the east coast that advertised an ev with lithium cells plus supercaps. They never did sell any afaik and are no longer in business.
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