A protection board consists of integrated circuits (ICs), metal-oxide semiconductors (MOS) switches, capacitors, resistors, negative temperature coefficient thermistors (NTCs), positive temperature coefficient thermistors (PTCs), memory, ID, and other auxiliary devices. You can find protection boards as standard catalog items from a supplier, as yo. The main function of the protection board is to monitor the state of charge (SoC), temperature, voltage, current, and state of health (SoH) of the battery pack. The MOS is controlled by the control IC. The MOS is always turned on during normal functions. If the battery pack goes outside normal thresholds that are programmed into the circuit board,. All lithium battery cells, BMS, and protection boards undergo certification. UN/DOT 38.3.5 involves the shipping and transportationof lithium batteries. Other certifications include the IEC 62133 as well as UL 2054, UL 2580, and UL 2271. These certifications will be based on whether the battery cell and protection circuit are shipped separately if. All lithium batteries must have a protection board or BMS connected to the battery cells. The customer must also obtain certification for the cell and BMS system. Keep in mind that customizations can be performed to the protection board so that it can properly monitor the features of the battery cell.