I have a 2011 Leaf battery pack that is now powering a 2008 Mini Cooper hatchback. I am using the Leaf's BMS and get readings of about 4.1v on each of the 96 cells. In testing the third party charger, the battery voltages climb nicely, but I have a few cells that got to 4.3v without any shunts ever turning on. I have tried charging both with and without +12v on the yellow wire (pin 21 of the pack connector - master charge relay engaged). When charging, I do see negative amperage on the current transducer, so I think the BMS should be able to tell that we are charging and it should attend to the shunts.
The only piece of the puzzle I cannot test or simulate is the connection of the BMS to the VCM. I suspect there might be a command from the VCM to the BMS to initiate the cell balancing. Does anyone have intimate knowledge of what it takes to force the BMS to start balancing? Without functional shunts, all my efforts to use the Leaf's BMS will have been for nothing. And I've put some ridiculous effort into it!
Thanks in advance!