Some time ago, I contacted ESMA in Russia:
http://www.esma-cap.com/About/?lang=3DEnglish
Sometimes the above address may not run, so just leave every thing out afte=
r =
the com to get to the site.
They have super capacitors that are design for traction which are call =
traction super capacitors which have a conductive electrolyte instead of oi=
l =
or air. They also have ultra capacitors which are design as pulse =
capacitors for hybrids or starting large engines.
A large bank of super capacitors at 300 volts can run a city bus for up to =
10 miles and then can be recharge in with 10 to 15 minutes.
I gave them the specifications of my EV that weighs 4640 without the batter=
y =
pack, Caf=E9 Electric DC controller, a PFC-50 charger and a battery pack sp=
ace =
of 2200 square inches by 12 inches high. They came up with the following =
data.
Traction Super Capacitors
Thirteen 10-cell modules that are 21.5" long by 7.125" wide by 9.9" high. =
Weighs 75 lbs each for a total of 975 lbs.
Maximum Voltage per Module - 16 volts or 208 volts per pack
Minimum Voltage per Module - 9 volts or 117 volts per pack
Capacitance (AH) - 460
Maximum Power, KW - 420
Discharge Energy at 100 A - 7.5 MJ
Operating Temperature C. - -50/+70
Cycle Life - 500,000
Price per Module - $3000.00
You can use the existing controller and battery charger for a DC system.
Roland
----- Original Message ----- =
From: "tomw" <
[email protected]>
To: <
[email protected]>
Sent: Saturday, November 06, 2010 6:26 AM
Subject: Re: [EVDL] Who sells controllers for ulta-caps ?
>
> My impression was that most applications use the supercapacitors in =
> parallel
> with the battery pack to limit current spikes to/from (if have regen) the
> pack. If you pull 400A at 115V for 20 seconds during acceleration, that is
> about 920 kJ or about 0.26 kWh. The energy discharged from the caps is
> 0.5CV*V, so for a 5V change in voltage (120-115) that would be about 31.3 =
> kJ
> or about 0.009 kWh. If my numbers are correct, I don't see how this helps
> reduce battery current spikes all that much. It seems more cost effective
> to size your pack at larger Ah capacity to limit the current spikes to =
> less
> than 3C (for LiFePO4 cells), so they have a small effect on cycle life.
> -- =
> View this message in context: =
> http://electric-vehicle-discussion-list.413529.n4.nabble.com/Who-sells-co=
ntrollers-for-ulta-caps-tp3029625p3029965.html
> Sent from the Electric Vehicle Discussion List mailing list archive at =
> Nabble.com.
>
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