Why the BMS suffered over-heating problems in process of charging ?
A. The charging current exceeds the maximum charging current of the protection board and the protection board heats up.
B. When the charge is almost full, the equalizing resistor heats up
C. The general hardware protection board turns off the discharge switch to charge, and the discharge MOS will not automatically turn on. The protection board with the same charging and discharging port or half-port structure is charged when the discharge switch is turned off. The charging current is charged through the body diode of the discharging MOS. The 10A charging current multiplied by a diode voltage drop of 0.7V will cause a loss of 7W. So there will be severe fever.
D. Part of the hardware protection board is charged in the undervoltage state, and the discharging MOS will not automatically turn on. The protection board with the same port or half port structure is charged under the condition of undervoltage. The charging current is charged through the body diode of the discharging MOS. If the charging current is larger, it will cause serious heat. When the battery cell voltage rises to the undervoltage release value, the discharge MOS is turned on and the temperature starts to drop slowly.
E. The charging MOS or the discharging MOS is damaged or the driving voltage is abnormal, which causes serious heating of the charging and discharging MOS.
F. The battery core heats up abnormally, and the high temperature is transmitted to the protection board.