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Old 10-28-2010, 06:02 AM   #11 (permalink)
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Supposedly this battery was only about 300 kg, giving well over 300 Wh/kg...

I want to believe this is true, and I also want to see some independent testing to confirm it.

The best EV conversions on the road only need ~100-120 Wh/mile highway(Reverend Gadget's GT6-bodied Triumph Spitfire, John Bryan's Karmann Ghia, Aptera 2e, ect.). A 100 kWh pack would give range sufficient for a road trip in a car like that... without needing to stop and charge.

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Old 10-28-2010, 06:39 AM   #12 (permalink)
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its do-able. at my work we could do it just about. we run electric arc furnaces at around that power everyday.
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Old 10-28-2010, 07:58 AM   #13 (permalink)
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Quote:
Originally Posted by SVOboy View Post
It's so ugly though
Beauty is in the eye of the beholder. Or was that the beer holder? Anyway, I love the A2. Now that paint job though...

Incredible feat for an incredible car. Keep em coming, that's how the ball gets rolling.
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Old 10-28-2010, 08:00 AM   #14 (permalink)
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Quote:
Originally Posted by The Toecutter View Post
Supposedly this battery was only about 300 kg, giving well over 300 Wh/kg...
That's twice the expected value, so [citation needed].
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Old 10-28-2010, 08:17 AM   #15 (permalink)
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Quote:
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That's twice the expected value, so [citation needed].
Das Wunder von Berlin | Das elektrische Fahrtenbuch

380V, 260AH, 300 kg
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Old 10-28-2010, 09:21 AM   #16 (permalink)
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If this is real, then the end of the ICE age is here.

They are also saying the batter is 97% efficient, which a bit better than current batteries (which are ~94% as I understand it?).

They had ~18% charge left, and since we don't know what the DOD is, a wild ass guess is they used ~90kWh, and this works out to ~240Wh/mile. Which is very plausible, though not outstanding. At 660 pounds, this battery could be used in Dave Cloud's Dolphin and since it is 1,300 pounds lighter, it could get below 100Wh/mile -- and have a range of about 1,000 miles!

That would be a revolution!

Edit:

From Toecutter's link:

Quote:
Technical Data Audi A2 DBM *
* Subject

Empty weight (including driver) 1260 kg
Perm. Total weight 1600 kg
Battery lithium-iron-polymer (260 Ah/380 V) cell voltage of 3.8 volts
Battery weight about 300 kg
Charging time about 4 hours due to mains phase current in the household (380)
battery requires 6 minutes (future solution)
Life time 2500 charge cycles (without loss of capacity)
= Service life target: 500,000 km
Top speed 160 km / h
5-speed sequential gearbox (race gear: shifting without the clutch)
E-motor 300 Nm torque
So, the 6 minute charge is future/theoretical limits of the battery. The actual time is 4 hours; which is still very impressive.
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Old 10-28-2010, 11:45 AM   #17 (permalink)
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Who really needs to charge that fast or go that far tho? for most people that kind of range is over a weeks worth of driving, for me it would be closer to a month of driving.
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Old 10-28-2010, 12:15 PM   #18 (permalink)
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50k@2500 cycles (battery cost-depreciation).
$20 per full cycle (every 375 miles under perfect conditions).
not including the electricity cost.
18.75 cents per mile in battery depreciation.
say 25 cents a mile in electricity and battery depreciation (at least).
they have a very long way to go.

regards
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Old 10-29-2010, 12:03 AM   #19 (permalink)
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Where are you getting the cost from?

In a more efficient car (the Illuminati Seven gets lower consumption than this A2, and Dave Cloud's Dolphin is much lower), that battery could go up to 600-800 miles.
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Old 10-29-2010, 01:06 AM   #20 (permalink)
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Quote:
Originally Posted by modmonster View Post
its do-able. at my work we could do it just about. we run electric arc furnaces at around that power everyday.
Yes, it's doable, but is it doable without reducing car & contents to a puddle of molten metal?

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