For cell #1, my guess is that the 4 parallel resistors (R3) are the balancing resistors and that Q1 is a small logic level MOSFET which enables cell balancing.
On a BMS project I'm working on balancing current is only 250mA, so a small SOT-23 MOSFET is all you would need.
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Take a look at http://files.wizkid057.com/teslapack/update2/Tesla%20BMS%20M...
For cell #1, my guess is that the 4 parallel resistors (R3) are the balancing resistors and that Q1 is a small logic level MOSFET which enables cell balancing. On a BMS project I'm working on balancing current is only 250mA, so a small SOT-23 MOSFET is all you would need.
Good eye. There are exactly 6 of those so yes, you are very likely right!