Lifepo4 battery manufacturer Specialized in Energy Storage Battery since 2009.

Five basic protection functions of lithium battery BMS

by:dcfpower     2021-03-26
With discharge overcurrent, short circuit protection, overcurrent current 3A, delay 0.2S. (1) Judgment of overcurrent and release conditions When the smart battery is in the charging or discharging state, when the current is detected to exceed 3A, after 0.2S delay, if it is still greater than 3A, it is judged as overcurrent. At this time, the protection execution circuit cuts off the discharge protection switch. The condition to release the protection is to connect the charger. When it is detected that the charger is connected, the overcurrent protection is released, otherwise the smart battery is always in the protection state. (2) Determining overcharge and releasing conditions If the battery cell voltage exceeds 4.2V or the total voltage exceeds 16.8V during the charging process, it is determined that the battery is in an overcharge state. At this time, the protection execution circuit cuts off the charging protection switch. The overcharge release state is that the voltage of all cells is less than 4V. (3) Determining the overcharge protection failure. During the charging process, if the cell 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 blown. (4) Determining over-discharge and under-voltage and releasing conditions During the discharge process, when a certain battery cell voltage is lower than 2.5V, the battery is judged to be in an over-discharge state, and the protection execution circuit cuts off the discharge switch to stop discharging. The release condition is that the voltage of all cells is greater than 3V. (5) Determining over-temperature protection and release conditions When the battery voltage temperature exceeds 55°C, it is determined that the battery is in an over-temperature state. At this time, the protection execution circuit cuts off the charge and discharge protection switch. The release condition is that the battery temperature is lower than 50°C. u003c/pu003e
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