Voltage Changes Before and After Forklift Battery Equalizing

The traction battery of an electric forklift is usually composed of multiple single cells connected in series to meet the high voltage and high power demand of industrial operation. After hundreds of charging and discharging cycles, the voltage consistency of different cells will gradually drift due to factors including uneven internal resistance change, inconsistent operating temperature around different cells, and occasional partial deep discharge during daily use. Before the equalization operation, even if the total voltage of the full battery pack measured from the external port reaches the nominal rated value, the actual voltage of individual single cells often shows obvious deviation. The voltage difference between the highest and lowest single cell may exceed 0.1V in many cases, some overused cells show significantly lower voltage than the average level, while a small number of cells with lower internal loss may show abnormal overcharge voltage at the full charge stage. Under this state, the actual available capacity of the whole battery pack will drop sharply, the continuous working time of the forklift will be shorter than the normal level, and the battery management system may frequently trigger overvoltage or undervoltage protection during operation, affecting the normal material handling work. The battery equalization process is designed to adjust the voltage of all single cells to a consistent level through professional circuit control. During the equalization process, cells with higher voltage will be discharged at a limited safe current, and cells with lower voltage will be supplemented with small current to gradually narrow the voltage gap, the whole process will last for several hours according to the actual condition of the battery pack. After the completion of standard equalization operation, the total voltage of the whole battery pack will stay in the normal nominal range, and the voltage difference between all single cells will be controlled below 0.02V, no obvious abnormal high voltage or low voltage cell can be detected. This stable voltage state can restore the actual available capacity of the battery pack to more than 90% of the original design value, effectively extend the cycle service life of the battery, and reduce the overall operating cost of the electric forklift. For professional battery equalization services and related technical consultation, you can contact Jianshu New Energy, if you encounter abnormal voltage fluctuation problems when using BYD Forklift in daily operation, you can also send your questions to the email 17399989919@163.com for targeted technical guidance. It is not recommended that non-professionals disassemble the battery pack and perform equalization operations without professional training, all relevant operations should be completed by certified technical personnel in a safety-compliant working environment, and 2 to 3 complete charge and discharge tests are required after equalization to confirm the voltage stability of the whole pack before putting it back into normal use. Regular voltage check and proper equalization maintenance at proper time can effectively avoid premature attenuation of the battery pack, and keep the electric forklift in good working condition for a long time.