The pack it came from is just one parallel, and they only run 230A peak.Joachim said:ok not the c-rate of a singel cel bud if you put more cells parallel you have more Ah so you can pul out more C out of the battery pack....just like you
write down here....my question: pulling 750Amps out of a singel cell?are more cells in parallel?
So you pul 750A from a singel cel i dont try this@home :lol:
no i dont havePajda said:Joachim can you please measure for me also a dimensions of a whole VW module, thx.
okashira said:The pack it came from is just one parallel, and they only run 230A peak.Joachim said:ok not the c-rate of a singel cel bud if you put more cells parallel you have more Ah so you can pul out more C out of the battery pack....just like you
write down here....my question: pulling 750Amps out of a singel cell?are more cells in parallel?
So you pul 750A from a singel cel i dont try this@home :lol:
I have not actually pulled 750A, I could, however it is not necessary, one can make measurements at lower current and extrapolate the result.
Like I said, I tested about 0.0011 Ohm DCIR, so at 750A the voltage drop would be about 0.83V which is perfectly acceptable for a 3.7V cell for 5-10 seconds.
liveforphysics said:okashira said:The pack it came from is just one parallel, and they only run 230A peak.Joachim said:ok not the c-rate of a singel cel bud if you put more cells parallel you have more Ah so you can pul out more C out of the battery pack....just like you
write down here....my question: pulling 750Amps out of a singel cell?are more cells in parallel?
So you pul 750A from a singel cel i dont try this@home :lol:
I have not actually pulled 750A, I could, however it is not necessary, one can make measurements at lower current and extrapolate the result.
Like I said, I tested about 0.0011 Ohm DCIR, so at 750A the voltage drop would be about 0.83V which is perfectly acceptable for a 3.7V cell for 5-10 seconds.
Every cell has some point of ionic pathway saturation, at which point it no longer behaves with a linear relationship to impedance. Finding out where a cell saturates can be tricky, many high C rate RC pouches will blow there own tabs before saturating the cell. It very well may be this cell does 750A, it also may saturate before that or any number of other high current failure modes before reaching 750A.
Chalo said:I built a 13S pack with those (which I think came out of a Ford?) and it's the most satisfactory battery I've ever used. It's 26 pounds including enclosure, but worth it. My previous 18650 pack seems like a toy by comparison. I'm only pulling up to 35A, so they'll probably do that job longer than they would in their original role.
liveforphysics said:Chalo said:I built a 13S pack with those (which I think came out of a Ford?) and it's the most satisfactory battery I've ever used. It's 26 pounds including enclosure, but worth it. My previous 18650 pack seems like a toy by comparison. I'm only pulling up to 35A, so they'll probably do that job longer than they would in their original role.
Share pics buddy so others can see. I love to see the EV car waste stream able to power ebikes.
pwd said:Do you figure these are the same cells ? https://www.ebay.ca/itm/294029958804
Wondering how well they can handle 140A peak for around 10 seconds?