The VE.Bus BMS protects each individual cell of a Victron lithium-iron-phosphate LiFePO4 or LFP battery
Each individual cell of a LiFePO4 battery must be protected against overvoltage, under voltage and over temperature.
Victron LiFePO4 batteries have integrated Balancing, Temperature and Voltage control 

The BMS will:

• Shut down or disconnect loads in case of imminent cell under voltage
• Reduce charge current in case of imminent cell overvoltage or over temperature VE.Bus products only, see below
• Shut down or disconnect battery chargers in case of imminent cell overvoltage or over temperature