Analysis of power lithium-ion battery voltage faults and solutions

1. High voltage of power lithium-ion battery: After being fully charged, the voltage of a single string or several strings of power lithium-ion battery is obviously higher, and the other cells are normal. Causes of failure: ① Acquisition error; ② Poor or failure of LMU equalization function; ③ Low battery capacity, and the voltage rises faster during charging. Solution: ①The display value of the cell voltage is higher than that of the other cells. The actual voltage value of the measured cell is compared. If the actual value is lower than the displayed value and is the same as the voltage of other cells, the actual value will be used as the standard for the LMU The cell voltage is calibrated; if the measured value is consistent with the displayed value, the cell power lithium-ion battery will be manually discharged and equalized. ②Check whether the voltage sampling line is broken or not connected; ③Replace the LMU. 2. The voltage of the power lithium-ion battery is low: After being fully charged, the voltage of the power lithium-ion battery or several cells is obviously low, and the other cells are normal. The cause of the failure: ①acquisition error; ②the LMU equalization function is poor or invalid; ③the cell self-discharge rate is large; ④the cell capacity is low, and the voltage drops quickly during discharge. Solution: ①The display value of the cell voltage is lower than that of the other cells. Compare the actual voltage value of the measured cell. If the actual value is higher than the displayed value and is the same as the voltage of other cells, the actual value is used as the standard for the LMU The cell voltage is calibrated; if the measured value matches the displayed value, the cell power lithium-ion battery is manually charged and equalized. ②Check whether the voltage sampling line is broken or not connected; ③Replace the LMU; ④Replace the faulty power lithium-ion battery pack. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Important advantages and uses of 18650 lithium ion battery