surfingslovak said:Yes, it's 96 modules and 192 cells. Since the pack voltage is an aggregate, it can fluctuate a bit after each charge and discharge to turtle mode. The voltage on a full charge is 4.10 on cell basis or about 493.4V on the pack level. I recall seeing something higher than that on occasion, perhaps 0.5 or 1V extra on pack level.
Thanks for the correction, Tony. Yes, that was a typo, sorry about that. I fixed it to avoid confusion.TonyWilliams said:surfingslovak said:Yes, it's 96 modules and 192 cells. Since the pack voltage is an aggregate, it can fluctuate a bit after each charge and discharge to turtle mode. The voltage on a full charge is 4.10 on cell basis or about 493.4V on the pack level. I recall seeing something higher than that on occasion, perhaps 0.5 or 1V extra on pack level.
96 cell pairs * 4.1 volts = 393.6 volts
What is the SOC at 3.6V? Do you have a reference about why this would be the best voltage to store the battery?GregH said:Best would be to leave the batteries at 3.6V at around 20 degrees C and don't drive the car
On the Leaf 3.6V (345v) is pretty low SOC.. somewhere between LBC and VLBC? maybe 20% SOC? The differences between 3.6V and 3.8V in regard to battery longevity is probably not that big of a deal.. more important (by far) seems to be to keep it cool.Stoaty said:What is the SOC at 3.6V? Do you have a reference about why this would be the best voltage to store the battery?GregH said:Best would be to leave the batteries at 3.6V at around 20 degrees C and don't drive the car
There are 192 cells, but there are only 48 modules in the LEAF. Each module contains four cells, with two pairs of parallel cells in series.surfingslovak said:Yes, it's 96 modules and 192 cells.
Yes, correct, thank you for catching that. It's 96 cell-pairs, which is the factor used when multiplying cell voltages. It's been along week. These questions come up all the time. I haven't read the wiki in its entirety recently, but my recollection is that all this information is up there.RegGuheert said:There are 192 cells, but there are only 48 modules in the LEAF. Each module contains four cells, with two pairs of parallel cells in series.surfingslovak said:Yes, it's 96 modules and 192 cells.
Yeah.. it drops off pretty fast below 345V (3.6V/cell) On the LeafDD the far right side of the voltage graph is 330V. By the time you get down to 330-340V you're well under VLBW. Personally I wouldn't advocate too much timer under VLBW (and if so, go gently!) but I don't see any trouble from VLBW to LBW. If you're down to 11 or fewer bars of capacity I would think VLBW would be a common sight.surfingslovak said:While lower voltages are generally better for storage, personally, I would not go under 20% SOC or the LBW in the extreme case. It also depends on how long the battery will be kept at this potential. A few hours, days, weeks or months. I'm on the go and unable to post the discharge graph from the LEAF battery pack presentation, but it matches what Greg said pretty well. Isn't the knee on the discharge curve somewhere between 340 to 350V?
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