AussieJester
1 TW
voicecoils said:I haven't heard any stories of failures either and more then 1,000 roadsters have been delivered.
Give it time
KiM
voicecoils said:I haven't heard any stories of failures either and more then 1,000 roadsters have been delivered.
TylerDurden said:Brain-fart: A large packs might benefit from plates that can pass coolant... Corrugated aluminum panels, perhaps.
Certainly would add to pack size and weight; but the benefits might surpass the penalties.
Doctorbass said:Reading these Energy density calculation i think we might take in acount the connection from one cell to another..
...
We should add the connection structure weight in the calculations.
liveforphysics said:Cooling these cells really isn't going to be a concern guys.
For a drag racing application, I've dead-shorted these prismatic A123 cells for 10-15 seconds, and they don't melt. That's way harder abuse than they're ever going to take in a drag application, and then they get 15-20mins to cool down while you wait in line to get to make a pass again.
CroDriver said:Hmm, I heard that some crazy guy is going to race against gas cars in REAL races (not only drag racing) with this pack.
AussieJester said:CroDriver said:Hmm, I heard that some crazy guy is going to race against gas cars in REAL races (not only drag racing) with this pack.
Yeah he sounds like a right tool Co Driver what a twit, stay away from him man he will
get you into trouble
Seriously buddy, looks insane, is this a definate goer is it? IIRC your running ThunderSkys in
a car now is that correct? What car are you planning on dumping this pro-setup in mate?
Best of luck anywayz be sure to follow that when you start it!!
KiM
AussieJester said:I recall there was a 'mate' of yours that came here briefly pissed a few off with a couple
comments he made, he had a kit car? was it?
AussieJester said:I saw a thread of that on another forum, if you have one too would like to subscribe to it too follow your progress...
KiM
crodriver, what's the link for those pictures? I wanted to check out that guy's project but couldn't find it using the file names for the photos. Thanks!CroDriver said:Hmm, I heard that some crazy guy is going to race against gas cars in REAL races (not only drag racing) with this pack.
Here is what this crazy dude wanted to do with them:
<snip>
I hope that this will keep them cool
bigmoose said:Kim is thinking of a guy that went by "Jeff" I believe. He also offered for sale an A123 vehicle battery pack for $30,000 IIRC.
In a "street EV application" the cells would be enclosed and possibly pressed against each other. Do you think in that situation cooling won't be an issue?liveforphysics said:Cooling these cells really isn't going to be a concern guys.
For a street EV application, if you want at least a 30minute run-time, this means the average C-rate on the cells is going to be 2C. You're going to have bursts of 20-30C during peak acceleration, and you're going to have times where it's coasting or braking etc, or just cruising along holding a set speed, and it will be cooling down during these periods.
I've done 1.5 minutes at 450amps on the fresh 15Ah cell, and it was warm, but not dangerously hot. That's 11.25Ah, which is 75% of the capacity of a 15Ah cell anyways, and that's taking it all continuously at 30C. I could have continued to discharge at 450amps, I just stopped because my loadbank was starting to glow red. lol
gestalt said:I got a chance to go over one of the large packs that a123 uses and it seems that they sandwich the cell between two sheets of aluminum for heat syncing. and between each of those sandwiches ~~mmmm, lithium sandwich~~ there is a layer of a neoprene like material to allow for expansion. I was told that the cells can expand about 10%, have you seen anything like that in your tests?