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@P-hack That is an interesting circuit. It would do the job nicely and if another capacitor and switch set was added then the last cell could swap charge with the first cell so that all cells received the same refresh rate. As i am looking at it i see the number of wires required and can't help but wonder if some sort of combined power transfer/communications could be achieved so that cell top BMS modules could communicate to the BMS master module along those wires and the power transfer capacitors could be integrated into the BMS master controller. Actually seeing as the BMS master controller has a micro controller maybe there is a way for the charge to be moved in a more controlled manner. The BMS master module just having one capacitor that it switched across the cell with the highest state of charge and then delivered that charge to the cell with the lowest state of charge. The BMS master could keep track of each cells performance and warn if a cell was going bad (high self discharge). This would avoid the scenario of one bad cell slowly taking charge from all the other cells and discharging the pack.
Just need a couple of high current switching arrays (does such a thing exist?). It would also mean that the charge swapping would be stopped once there was no more imbalance.
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