whats the highest discharge performance for ev batteries?

[veloman]

Such as a drag race bike. Watts/kg for battery alone? C rate? 80c? What about other non ev batteries? Anything better?

 

[arkmundi]

Lot's of lit available on A123, the only cell I use, the nanophosphate advantage. See, e.g. http://www.horizonhobby.com/pdf/A123FAQs.pdf. 30C continuous, up to 60C pulse discharge.

 

[Hillhater]

Such as a drag race bike. Watts/kg for battery alone? C rate? 80c? What about other non ev batteries? Anything better?

You have been around here long enough to know this has been discussed many times, and know how to search it out. !
Packs like this are the way to go for performance without breaking the bank..
http://hobbyking.com/hobbyking/store/__45143__Turnigy_nano_tech_A_SPEC_G2_5000mah_4S_65_130C_Lipo_Pack.html
They would give around 8+ kW/kg.
There are better , but the cost is high !

 

[arkmundi]

There's this new electric racing car that was just unveiled: Beam Me Up Chevy: Chaparral 2X Vision GT is Laser-Powered at the Los Angeles Auto Show:

"The Chaparral 2X VGT’s concept propulsion system is inspired by technology derived from advanced work targeted at space travel and future aircraft design. It features a mid-mounted laser beamed-energy propulsion system, which pulses beams of light that focus in a shroud, creating shock waves that generate tremendous thrust in the lightweight race car.

With a 671-kW laser, powered by a pack of lithium-ion batteries, and an air-powered generator to provide 900 horsepower worth of thrust, the Chaparral 2X VGT will be capable of a 240-mph top speed in the video game with 0-60 acceleration capability of 1.5 seconds.

The propulsion system’s position in the composite chassis complements an unconventional yet highly active prone driver configuration – face down with the driver’s arms and legs splayed toward the wheels. In fact, the race car’s propulsion and suspension systems are built around the driver, enabling progressive strategies of active and driver-adjustable aerodynamics."

http://en.wikipedia.org/wiki/Chaparral_Cars#2X

I think the question of high performance batteries for racing should be well explored. Let us know what you find out.

 

[Dauntless]

Harkens back to the "Vacuum Car" of yesteryear, the Chapparal 2J. And this was a REAL car, they didn't have videogames back then.

 

[veloman]

Would I be correct in saying that there may be volume demand in only the RC market? Unless perhaps the battery had good energy density so it had competitive range.

As shown above, the A123 and nanotech is capable of 60c. At these levels, are batteries not the weak link anymore? Or do people want a 10lb 40kw battery?

I just wonder if there is much point in building a battery like this, when you can get those nanotechs already.

 

[arkmundi]

Would I be correct in saying that there may be volume demand in only the RC market? .....

The LEV, pure & hybrid electric vehicle markets are expanding. Elon Musk's gigawatt factory, the largest battery manufacturing plant yet to be attempted, is for his Tesla's only. On WH basis, the RC market is not much by comparison, I'm sure. The most competitive racing cars/motorcycles will be electric and competition is fierce. See http://www.ebaracus.com/about/ fyi....

 

[Hillhater]

As shown above, the A123 and nanotech is capable of 60c. At these levels, are batteries not the weak link anymore? Or do people want a 10lb 40kw battery? .

I think you are miss reading something there.
The A123 wont give 60C .. 20C is the best for their pouches, 30 C for their cylindrical cells.
Volume demand for high C cells ?? ..depends on your view of volume, RC market is small compared to even the Ebike market in china, and when E motos become popular also, there will be a huge demand for high power cells.
There are also rapidly developing uses in aviation ( ultra lites, and commercial drones ) as well as professional racing classes ( F1, Formula E, Bikes, Andros ice racing, Drag racing, etc )..where 1 racer will use as many packs as 100 RC hobbyists .
And every one of thise is looking for the lightest , most power and energy dense cells. !