Five protection functions of lithium battery BMS -Lithium - Ion Battery Equipment
Lithium-ion battery BMS has discharge overcurrent and short circuit protection functions, with an overcurrent current of 3A and a delay of 0.2s.
1. Determine overcurrent and discharge conditions
When the smart battery is in the state of charge and discharge, the detected current exceeds 3A, and it is still greater than 3A after 0.2s delay, then it is judged as overcurrent. At this time, the protection executive circuit cuts off the discharge protection switch. To remove the protection condition is to connect the charger. When a connected charger is detected, the overcurrent protection is removed, otherwise the smart battery will always be in a protected state.(Lithium - Ion Battery Equipment)
2. Determine overcharge and release conditions
When the battery voltage exceeds 4.2v or the total voltage exceeds 16.8v during the charging process, it is judged that the battery is in an overcharged state. At this time, the protection execution circuit cuts off the charging protection switch. In the overcharge release state, the voltage of each battery is less than 4V.
3. Determine the overcharge protection failure
During the charging process, if the battery voltage exceeds 4.4v, it is determined that the charging protection function is abnormal, the secondary protection circuit is activated, and the three-terminal fuse is welded.
4. Determine over-discharge, under-voltage and discharge conditions
During the discharge process, when the voltage of a certain battery is lower than 2.5v, it is judged that the battery is in an over-discharge state. At this time, the protection executive circuit cuts off the discharge switch and stops the discharge. The release condition is that the voltage of all cells is greater than 3V.
5. Determine overtemperature protection and release conditions
When the battery voltage temperature exceeds 55°C, it is judged that the battery is in an overheated state. At this time, the protection execution circuit turns off the charge and discharge protection switch. The release condition is that the battery temperature is lower than 50°C.
1. Determine overcurrent and discharge conditions
When the smart battery is in the state of charge and discharge, the detected current exceeds 3A, and it is still greater than 3A after 0.2s delay, then it is judged as overcurrent. At this time, the protection executive circuit cuts off the discharge protection switch. To remove the protection condition is to connect the charger. When a connected charger is detected, the overcurrent protection is removed, otherwise the smart battery will always be in a protected state.(Lithium - Ion Battery Equipment)
2. Determine overcharge and release conditions
When the battery voltage exceeds 4.2v or the total voltage exceeds 16.8v during the charging process, it is judged that the battery is in an overcharged state. At this time, the protection execution circuit cuts off the charging protection switch. In the overcharge release state, the voltage of each battery is less than 4V.
3. Determine the overcharge protection failure
During the charging process, if the battery voltage exceeds 4.4v, it is determined that the charging protection function is abnormal, the secondary protection circuit is activated, and the three-terminal fuse is welded.
4. Determine over-discharge, under-voltage and discharge conditions
During the discharge process, when the voltage of a certain battery is lower than 2.5v, it is judged that the battery is in an over-discharge state. At this time, the protection executive circuit cuts off the discharge switch and stops the discharge. The release condition is that the voltage of all cells is greater than 3V.
5. Determine overtemperature protection and release conditions
When the battery voltage temperature exceeds 55°C, it is judged that the battery is in an overheated state. At this time, the protection execution circuit turns off the charge and discharge protection switch. The release condition is that the battery temperature is lower than 50°C.
