I have just recently begun to investigate buying an electric scooter. So far I have been impressed, yet I think the same thing that shocks people is the power issue. I have noted much talk about waiting for lithium batteries and using silicon batteries but I think their already exist a better option, I'm just not electrically inclined enough. I would like someone to tell me if this sounds on the right line.
Has anyone considered using a Nanophospate battery? Here are some specs from the only distributer I know of A123System.
Cell Type: ANR26650M1
Model No. AS400059-001
Nominal operating Voltage 3.3V
Dimensions: 26mm x 66.5mm ht. including tabs
Cell weight 70g
Assembly Weight 72g including tabs
1 Developer Kit, 6 cells $129.00
2 or more kits $110.00 each
It seams that if you want to run at 60V you would need roughly 18 of these batteries or 3 kits which would cost $330. If you know anything about these batteries they charge to 80% in about 5 minutes. This is what they use to convert Toyota Prius from a Hybrid Electric Vehicle to a Plug-in Hybrid Electric vehicle. The weight savings is enormous at just under 3lbs for the whole battery 12V battery; I bet you would get lots of extra miles out of these little guys regardless of the scooter/moped you ride.
You are correct in that you'll get 60V with 18 cells and that will run the scooter, but what you aren't including is the capacity of the cells. With 18 cells you might make it couple miles. You'll need to buy more cells and put them in parallel to keep the same volts, but increase the amp hour rating. Usually you're looking at around $2400, sorry to be the barer of bad news. To replace the batteries in the 60V XM-3000 you'd need 400 of those cells. You did pick out the lithium with the best properties though.
XM-3000...
-DC-DC converter replaced with a Dell D220P-01 power supply.
-72V mod
-Expensive bank charger until I come up with something better... Still trying.
-
How do you figure the amp hour rating you need. These battery cells have a nominal capacity and voltage of 2.3 Ah, 3.3V. The internal impedance (1kHz AC) is 8 mΩ typicaly. Maximum continuous discharge is 70A and pulse discharge at 10 sec is 120A for each cell. But how do you figure it out for your 400 needed cells. Or in other words how would I determine how many I need.
Hi Boonsage,
Ill give you a data point.
On my emax i use 19 40AH LiFePO4 cells for 60.8v nominal at 40AH.
This gives me 50-60km range at 60-70kmh with many a stop start and traffic.
How many cells you need depends on how far and fast you want to go.
Matt
Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah in July 2010. Done 194'000km
who sell this nanometer battery ? Is it from China ?
We test 30AH48V nanometer battery since 2 years before....burnt 3 times.
You can find it at http://www.a123systems.com
Best wishes for the meeting ;-)
ZERO EMISSIONS...RIGHT NOW
by http://www.bereco.es http://scooterselectricos.eburra.es http://www.tinacria.com & Others
ZERO EMISSIONS...RIGHT NOW
by http://puntosderecarga.blogspot.com http://scooterselectricos.eburra.es http://www.moveco.es http://www.tinacria.com & Others
If you want a good price ($20) on Li-ion 16V 4 amp batteries, get a hold of this guy allanbull [at] sbcglobal.net and you wont be disappointed.
whoa, theres a blast from the past.....did you read the dates on the posts?
Daily Ride:
2007 Vectrix, modified with 42 x Thundersky 60Ah in July 2010. Done 194'000km