The five basic protection functions of BMS lithium-ion batteries

Source: 2020 - 04 - 11: when click traffic time the five basic protection of lithium battery BMS has discharge over current, short circuit protection function, flow current 3 a, delay 0. 2s。 ( 1) Flow and discharge conditions were determined in the condition of intelligent battery charge and discharge, when detected current greater than 3 a, delay 0. After 2 s, if the current is still greater than 3 a, the judgment for the flow. Then the executive circuit disconnection discharge protection switch. Protect the condition that connect the charger. After the charger connected, over-current protection will be removed. Otherwise, the intelligent battery will be in a state of protection. ( 2) Determine the charge and discharge conditions in the process of charging, if the battery voltage is more than 4. 2 v or total voltage more than 16. 8 v, then judge the battery in charging status. Then the executive circuit disconnection charging protection switch. Is the status of the charging discharge all the battery voltage is less than 4 v. ( 3) Determine the overcharge protection failure in the process of charging, if the battery voltage is more than 4. 4 v, the judge charging protection function is unusual, start the secondary protection circuit for three-terminal fuse fusing. ( 4) After discharge, under voltage and discharge conditions were determined in the process of discharge, when a battery voltage is lower than 2. 5 v, judge the battery in a discharge state, the protection circuit to cut off the discharge switch, stop discharge. The release of all greater than 3 v battery voltage condition. ( 5) Overtemperature protection and release conditions were determined when the temperature of the battery voltage is more than 55 ℃, judge the battery in overtemperature condition. Then the executive circuit disconnection to charge and discharge protection switch. Release conditions: the battery temperature is lower than 50 ℃.