Currently, lithium batteries are becoming more and more popular. Especially on solar energy storage systems and UPS (Uninterruptible Power Supply) Lithium ion HV system, etc. For the lithium iron phosphate battery cells, the single cell voltage is nominal rated 3.2V, all voltage, current, power (kW) and energy (kwh) applications are based on this. High voltage lithium battery system usually refers to the battery system voltage is greater than or equal to 96V, for example, 192V 50Ah battery system is 1P60S (60 cells series connected) cell connection based on 50Ah single cell capacity, 240V 50Ah battery is 1P75S cell connection, 384V 100Ah battery is 1P120S cell connection based on 100Ah cell, etc. We also can parallel cell first for double or triple total capacity. The corresponding battery capacity is usually 50Ah, 100Ah, 150Ah, 200Ah, etc.
BMS applications between high voltage lithium batteries and low voltage BMS applications are completely different applications. Low voltage lithium battery system usually refers to a parallel application system such as 48V or 51.2V battery system. For high voltage, in the single-cluster battery system, the batteries are always connected in series to achieve a higher voltage. Moreover, there is a high voltage DC main unit is needed to manage this high voltage cluster. The main function of the high voltage DC main unit is to manage all the BMU units of this cluster through the master BMS, meanwhile to provide start-stop, protection and other functions for this cluster.