Interesting. It may have been posted, but I have missed any definitive statement that actual balancing occurs and the method used. It is assumed that balancing occurs at 100% charge, but I wonder if that is really in effect during DC quick charge. Do you have a reference for the method? Thanks.gbarry42 wrote:Also, the cells in the pack will bypass themselves when they reach full charge. This lets the other cells "catch up"--this is the "balancing act".
Thank you for that reference. So it is a discharge of high cells. And, it certainly must be the discharge of a parallel pair.Danal wrote:From the service manual:
HOW TO ADJUST CELL CAPACITY
During cell capacity adjustment, the capacity of each cell is estimated based on the no-load voltage when the
system starts, and the capacities are adjusted so that they are all at the target level. The voltage of each cell is
detected inside the Li-ion battery controller. The bypass switches are then turned ON to discharge the cells
that have excess capacity. In this way, capacity adjustment by the Li-ion battery controller allows the capacity
of all cells to be fully utilized.
This followed by a diagram that shows a "bypass switch" wired in parallel with each cell. In reality, I'd be fairly certain what they show as a cell in this diagram is pysically a 2P group. All circuitry is on an ASIC inside each module. Therefore, I'd expect 2 ASICs per module.
I haven't tried QCing over 50% because I've always been around 8%-30% SOC when I've used it. Next week, I'll charge when it's above 50%/7 bars and I'll let you know if it doesn't stop at 80% (set to 90% on the Blink). I need to correct you though on the part about it will stop charging at 80% regardless of what the Blink is set to. When you are at 30% (actual) SOC or lower, it will shut off at 20%, 30%, 40%, 50%, 60% or which ever percentage you set it to that is under '90%' when you are under 30%. I've already done that so I know.DarkStar wrote:FYI, the Leaf still does take priority on the Blink QC units. If you're below 50% SOC, the Leaf will stop charging at 80% SOC, regardless of what the DC Quick Charger is set at. If you're over 50% the Leaf won't attempt to stop charging until it reaches 100%.LEAFfan wrote:What kind of QC did you use because the Blink QC seems to operate much differently than the one you used. The Blink one charges to whatever you set it to and it makes no difference at what SOC % you start from. However, I found that to get an 80% charge (78-79% actual), you have to set it to '90%', and it will charge a little faster (about 23 mins.) when you are down to two bars or less. Also, to get a 100% charge takes an additional 32 minutes (after the 90%) and it only takes it to 97% SOC. I can't get the raw numbers yet. Since QCing, I now get 81.8% for an 80% charge on L2 where as before QCing, I usually always got 76.8%. I haven't charged to 100% yet on L2 since the QCs, but the most I've gotten on L2 is 94%. I'm going to 100% charge later today/tonight for tomorrow. I'll probably get close to 100% now (Edit: I predicted correctly...99%!).
HAPPY THANKSGIVING Everyone!
After you enter your zipcode, it tells you to connect the charging handle, then a screen pops up with all the different percentages of charge that you may choose. To get '90%' (80% charging), you have to select 'more options' and then it shows you 90% and 100%. After you select your %, you push the 'Charge' button on the screen. It tells you at what percent SOC (actual) you started from and when it ends, tells you how much time it took and to what SOC% it is. However, when it says '90% charged, I either have 79% SOC on the gauge or 80%. The techs explained to me why I'm getting more SOC now with L2 charging (82% at 80% and 99% at 100% charging) than I used to. It's a 5% increase so far. It's definitely from QCing, but it isn't really balancing the cells per se such as with L2 charging, but it allows a higher % now because of QCing. I hope this explanation makes sense.garygid wrote:1. One Blink QC is described a Start/Stop only unit, another as having "Charge-To" settings. How are the settings accessed on the "setable" Blink QC?