The BMS detects the voltage difference between the batteries and balances the batteries to maintain and improve the consistency of the batteries and improve the performance of the battery pack.
Active battery balancing refers to transferring the power from the high-energy battery to the low-energy battery, so as to achieve the purpose of battery balancing. Since the energy can be transferred, the battery equalization efficiency is relatively high, the energy loss is small, and the charging time is short. The disadvantage is that the structure is complex and the cost is high. The BMS with active equalization function is generally higher than the BMS with passive equalization function.