Cell Balancing post Recall 196..

[electriceddy]

Balancing will be done in the same unit that monitors cell voltages, as it has connections to each cell.
Bear in mind that balancing will be making small changes to adjust cell voltage, and can do this fairly slowly, so the power dissipation isn't likely to be very high. There are some pics of some BMS modules on the openinverter forum - looks like a bunch of transistors and resistors, e.g.
Kia PHEV : https://openinverter.org/forum/viewtopic.php?f=13&t=1179
Zoe : https://openinverter.org/forum/viewtopic.php?f=13&t=1179

I would assume the CMU has a connection to each 3P cell group (98 connections total)
Curious just how much of an imbalance between the individual cells in that group would trigger an error code. If one cell were completely dead, the other 2 could pick up the slack even with a little help from adjacent healthy groups. A condition over time that would be more distinguishable, but in the short term may be overlooked.

 

[mikeselectricstuff]

I would assume the CMU has a
Curious just how much of an imbalance between the individual cells in that group would trigger an error code.

100mV I think - don't recall where this figure came from - I think it was a description of the BMS changes someone got from Korea

 

[KiwiME]

I would assume the CMU has a connection to each 3P cell group (98 connections total)
Curious just how much of an imbalance between the individual cells in that group would trigger an error code. If one cell were completely dead, the other 2 could pick up the slack even with a little help from adjacent healthy groups...

Yes, that wiring is indicated in the docs, see blurry image below. The 3 cells in a parallel group have the same voltage of course but certainly one slacker would only have partial influence on the group balance voltage. Since they are wired in series, I don't see that adjacent groups could have any influence on each other in regards to balancing.
I think the value of 100mV was from the pass/fail battery test required before applying Campaign 960, the earlier BMS update.

 

[FloridaSun]

Charged on a power shared Chargepoint station today.. As the other port was in use, the power level was only 3.15 kw. I passed 82% and no cell balancing happened.. Charged to 84% before I disconnected.