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Diagram of power battery function modules (for reference)


Diagram of power battery protection board

PCM circuit diagram of power battery (for reference)

When detecting detection voltage drop of DC current on current protection circuit, to ensure the high-efficiency electric potential of current detection point, 1 mΩ~10mΩ is generally selected to use for the current sense resistor on the power circuit.
Much attention will be paid to resistance precision and wattage specification of precision resistance used for detection of detection current on the power battery; the resistance precision is smaller, the effect is better, which can promote to increase the detection efficiency. 
Detection resistance of current: SART recommends using SM series CSR. Such as SM25M2FR001T, SM25M2FR005T and SM25M2FR010T. Determine the resistance value of detection resistance according to MCU solution of clients.