What is the manufacturing process of lithium ion battery pack PACK

The first step is the sorting and matching group of batteries. The parameters of the automatic sorting machine should be set as follows: (cylindrical battery as an example, ternary system battery and lithium iron phosphate battery) The voltage difference is 5mV (if the battery is The quantity is large, and the consistency requirements are strict. You can choose to set 3mV as the first gear); the internal resistance difference is 3m (if the consistency requirements are strict, you can set 1-2m). The capacity difference cannot be screened on the automatic sorting machine, and the capacity aging cabinet should be installed for the capacity distribution group. Before leaving the factory, the batteries will be shipped in sub-assembly boxes according to voltage, capacity, and internal resistance. When the batteries arrive, the IQC of the PACK department shall conduct random inspections, and the capacity difference is recommended to be within 1%. When installing the battery cell assembly fixture and the automatic electric welding machine core assembly fixture, be sure to assemble the battery in the order of the positive and negative poles in the PE engineer's SOP. Reversing the order will cause the battery to short circuit. After setting up the automatic welding machine program, put the fixture cell in and start automatic spot welding. After the automatic spot welding is completed, the quality of the automatic spot welding battery pack should be inspected, and the leaked spots should be repaired. In the step of welding the PCM/BMS, employees must wear an electrostatic wristband to prevent the PCM/BMS from being damaged by static electricity. There are different steps according to different battery pack designs. If it is designed for PCM spot welding on the battery pack, do not solder, and the quality should also be spot welded on the PCM spot welded to the battery pack. If the PCM/BMS needs soldering, the PACK of the connection screw should be inspected on the solder joints and screw connection points. guaranteed quality. The voltage collection line should be in the order of B-, B1... to B+; or unplug the voltage collection line plug and solder. After the welding is completed, check the collection plug and connect it to the BMS after confirming that it is correct. The semi-finished product insulation is necessary to fix and insulate the voltage collection line, the lead, and the positive and negative output lines. The auxiliary materials are usually high temperature tape, highland barley paper, epoxy board, cable tie, etc. Be aware of safety, and do not superimpose the pressure on the battery pack voltage collection line or output wire, which may easily cause crush damage and short circuit. Semi-finished product test battery pack plus BMS, you can conduct a semi-finished product test. Routine tests include: simple charge and discharge test, the entire group of internal resistance test, the entire group of capacity test, the entire group of overcharge test, the entire group of overdischarge test, short circuit test, Overcurrent test. If there are special requirements, high-temperature and low-temperature tests, acupuncture tests, drop tests, salt spray tests, etc. are required. Special tests are destructive, and random inspections are recommended. Pay attention to the battery pack's ability to withstand, such as whether the BMS can withstand high voltage during the overcharge test of the whole set; whether the BMS can withstand instant high voltage and high current during the short circuit test; whether the BMS can withstand pulse current during the overcurrent test, etc. This step of PACK packaging depends on the design. But before packaging, the signal collection line and the positive and negative poles of the battery pack must be insulated. PVC packaging battery pack, overheat shrink machine. Ultrasonic sealed battery pack, on the ultrasonic machine. The battery pack with a metal outer box is assembled in the outer box. During this process, care should be taken to handle the battery pack gently to prevent collisions, squeezing, etc. The wires must be well insulated to prevent short circuits. The whole set of test The whole set of testers have set the parameters, and the whole set of testers on the battery pack will be tested. Important test items: shipping voltage, internal resistance, simple charge and discharge. Alternative test items: over current, short circuit. Packed and shipped according to the size of the open-molded foam. Do not place it randomly. When transporting the battery pack, you are most afraid of the internal packaging being empty. Be sure to ensure that there is enough foam inside for cushioning to prevent transportation crashes. For the large battery pack PACK, for safety reasons, it is necessary to arrange the shipment in a wooden rack. 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 post: Introduction to lithium-ion battery recycling technology and process characteristics