Yes, the BMS slave board can conduct separate current and voltage sampling for each cell.
1. First of all, the most fundamental way to detect current is to detect voltage, so the question can be changed to whether the BMS slave board can detect voltage and temperature. So the answer is yes, now one of the functions of the slave plate is to detect voltage and temperature.
2. Secondly, since the voltages of parallel cells are consistent through charging and discharging each other, detecting any cell can represent the voltages of all cells in the parallel cell.
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