Measure the data of initial voltage and internal resistance, and remove defective cells such as PVC film damage, missing surface pads, rust, deformation, and leakage.
It is detected by Formation & Grading systems, to analyze the capacity of these lifepo4 batteries and determine the quality level of the batteries.
After dividing the capacity, let the cells stand for a week to eliminate the cells with unstable self-discharge.
The internal resistance tester tests the cells, and the screening criteria are: the pressure difference is less than 20mv, the capacity difference is less than 2Ah, and the internal resistance is less than 0.3mΩ. Ensure cell consistency.
Automatic stacking and trapping, pneumatic stacking, to ensure that the lifepo4 battery pack can have a stable structure even in severe shaking, and it is not easy to loosen.Automatic laser welding, compared with manual welding is more efficient, more stable, and has smaller welding errors.
Manual installation, and through ADC, DIO, PWM, CAN, relay and other ports and devices, the various functions of the BMS system are tested again.
Connect the aging system to perform constant current discharge-constant current and constant voltage charging repeatedly, and end when the cut-off capacity is 70% SOC to see whether the discharge capacity of the lithium-ion battery pack reaches the qualified standard.
Wipe the qualified LFP battery pack with a rag and alcohol, and check the battery pack for any leaks and screws, etc.
Test again whether the internal resistance, voltage, differential pressure and capacity of the battery pack are qualified, and whether the communication of the battery pack and the inverter work is normal.
