Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Ultracapacitor/Supercapacitor for electric vehicles

  1. Apr 19, 2007 #1
    Hello All,

    We are trying to make an electric vehicle and we want to use ultracapasitor.
    Is there anyone who has experiences and what is differences these capasitors from others?
  2. jcsd
  3. Apr 19, 2007 #2


    User Avatar

    Staff: Mentor

    The supercaps that I'm aware of are for low-current, long life applications. Not for high peak current applications like a car. Panasonic makes some supercaps, so you could check their website. You're also not going to get the energy density out of a capacitor that you can out of storing the energy in the chemical reaction of a battery.

    Have you considered using a fuel cell instead?
  4. Apr 19, 2007 #3


    User Avatar
    Gold Member

    The only major difference that I'm aware of is that supercaps have a much higher energy density when compared to "regular" capacitors. If you need it for the purposes of vehicles, you'll need a supercap in excess of 2500F! I've never seen an electric vehicle powered by only a supercap. These kinds of capacitors would be best if it could get assistance from an internal combustion engine.
  5. Apr 20, 2007 #4


    User Avatar
    Science Advisor

    Maxwell Technologies makes some very heavy duty capacitors. They're great for huge power densities, but batteries are better for energy density. These caps also have a high self-discharge rate. I think that a car could best use these devices to take better advantage of regenerative braking. They can be charged much more quickly than batteries.
  6. Apr 20, 2007 #5
    Yes we will use in a hydrogen car.We try to design like this


    we dont want use a converter before motor driver because efficiency more importand for us.We want to regulate voltage after fuelcell with these supercaps
    Last edited: Apr 20, 2007
  7. Apr 23, 2007 #6


    User Avatar

    Staff: Mentor

    I just ran across an interesting article about applications of supercaps, including electric vehicle use. Interesting:

    http://powerelectronics.com/passive_components_packaging_interconnects/capacitors/power_ultracapacitor_technology_powers/?cid=top-articles [Broken]
    Last edited by a moderator: May 2, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook