Quote:
Originally Posted by freebeard
Also, how many pounds per kilowatt-hour for non-lead acid batteries? How many kilowatt-hours in the volume taken be say 10-20 gallons of gas?
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To get you to 650 VDC, there are not many options that fit into that space.
You could
- build a Tesla-like pack with panasonic cells (18 mm dia, 65 mm long) into series and parallel sets, so you can trade off max current versus capacity and range. Buy or fab holders for the batteries, spot weld the batteries together. Batteries are available in the 1 - 3 A-h range in this form factor.
- use 192 of a 40 a-h CALB .. at 1.83 in x 4.54in x 7.1 in and 3.3 lbs each. That would be a 24.5 kw-h pack and weigh 633 lbs. 400 amps for 30 sec, 120 amps continuous.
- use some of CALB's newest and most expensive cells. CAM-10 a-h, less weight and more energy dense than the CA series, but more money if you can find someone to sell them to you. Bottom of this page
EV Modules_CALB lithium battery
Meant for scooters, I would guess that 13 of these 48V packs strung together are larger than the space you have. 100 amps for 30 seconds, 30 amps continuous.
- build headway cells (38 mm dia, 120 mm long) into series sets, so you can trade off max current versus capacity and range. Buy or fab holders for the batteries, spot weld the batteries together. Batteries are available in 10 - 20 a-h each. I have no experience with these, but I hear bad things about them.
Maybe it would be a good idea to make use of Paul's proposed voltage boost on the input stage? Less batteries, less space, less weight?
What does the rest of the car weigh, and what sort of range are you looking for? You would be racing this car as well, right?