Other Parts Discussed in Thread: BQ76940,
Hello,
I have built a 14s Li-ion battery pack. The battery management system has BQ78350 + BQ76940.
All connections between the cells are the same (spot welding) except the connection between cell 7 and 8 which is a long nickel strip (I had to do that because of the form factor of the battery pack). This connection generates a non negligible ohmic drop (around 200 mV at 16A discharge current : 13 mOhm) which causes the measured voltage of the cell 7 to be underestimated (or overestimated in charge mode, positive current). Hence, the BMS always stops the discharge because the voltage of cell 7 reaches the low limit value before the other cells : I don't discharge the pack totally...
Is there a way to compensate this ohmic drop with the features of the bq78350 ? with Vaux for example ?
The best would be to replace the actual reading of Vcell7 with the formula : Vcell7(new) = Vcell7(read) - Rconnection*I ... I think ...
Thank you for your answer.
