What is the purpose of this PCB (its not the BMS!)

edrift.eu

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Full story here http://batteridoktorn.se/documentation/phylion-24v-1/
 
Without trying to trace the circuit, it looks like a balancing board. Some BMS boards don't have that functionality, so perhaps they separated it.

You could make a schematic for one cell by looking at the board and figure it out.

The large resistors are likely the balancing loads, and there are a few transistors to turn balancing on/off.
 
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