What is lithium battery protection mode?

The lithium battery protection mode is a mechanism used by the battery management system (BMS) to ensure the safe operation of the battery. BMS monitors the battery status to prevent it from exceeding the safe range and extend its service life. If the battery value exceeds the specifications, it will trigger the protection mode and turn off the battery to ensure safety.

Temperature protection:

Let's start with temperature protection. The battery rarely overheats, but if it does, it needs to cool down before restarting. The heating of lithium batteries is usually caused by high current or poor ventilation. Overcharge protection will cause the battery to shut down, the current to dissipate, and the battery to gradually cool down. However, if it returns to protection mode after being turned on again, you may need to reduce the load, lower the charging rate, or optimize the ventilation around the battery.

Current protection:

Next is current protection. When the load is too heavy or a short circuit occurs, our battery will protect itself to withstand short circuits and overloads that may damage the battery cells. In this case, you need to disconnect the load and determine whether to reduce the load or if there is a short circuit issue that needs to be repaired. Once the fault is repaired, the battery should remain in the on state and will not return to protection mode.

Voltage protection:

Voltage protection ensures that the battery is not damaged by high or low voltage. Under high voltage conditions, disconnecting the charging power supply can cause the voltage to drop and restart. When the voltage is low, charging the battery can restore it. However, charging zero volt lithium iron phosphate batteries may become complicated due to the safety features of smart chargers, as they only charge when the battery is detected, and batteries in undervoltage protection mode cannot be detected.