Lifepo4 battery manufacturer Specialized in Energy Storage Battery since 2009.

Polymer lithium battery production process

by:dcfpower     2021-03-31
The overall process: mixing pulpingu003e coating dryingu003e coating dryingu003e rollingu003e cutting stripsu003e pole pieceu003e windingu003e insulation testingu003e packagingu003e insulation testingu003e vacuum dryingu003e liquid injectionu003e sealingu003e charging and formingu003e pumpingu003e Edge bandingu003e Folding edgeu003e Chemical composition detectionu003e Aging detection 1. Mixed pulping u003cpu003eThe solvent and binder are mixed with the positive and negative active materials respectively. After being evenly stirred at high speed, a slurry-like positive and negative material is made. u003c/pu003e2. Coating and dryingu003cpu003eThe process of uniformly coating the prepared slurry on the surface of the metal foil and drying. u003c/pu003e3. Rollingu003cpu003eThe cut positive and negative materials are flattened and compacted by a pair of rollers. u003c/pu003eFour. Cutting into stripsu003cpu003eAutomatically slit the positive and negative materials of the entire roll into lengths that meet the design requirements of the production and battery specifications. u003c/pu003eFifth, making pole pieceu003cpu003eAccording to the technical parameters, the entire roll of pole piece will be automatically cut, welded and taped. u003c/pu003e6. Windingu003cpu003e Separate the positive and negative electrodes with a separator paper, automatically wind them into batteries along the axis, and attach a termination tape. u003c/pu003eSeven. Insulation testing 1u003cpu003eAfter the positive and negative plates are separated by the diaphragm paper winding; the composition is the electric core, and the insulation performance is tested. u003c/pu003e8. Package 1u003cpu003eThe bare cell is put into the punched aluminum-plastic composite film to seal the top opening of the cell. u003c/pu003eNine, Package 2u003cpu003eSeal the left side of the battery with the opening closed. u003c/pu003e10. Insulation test 2u003cpu003eTest the insulation performance of the cell tabs and aluminum-plastic composite filmu003c/pu003e11. Insulation test 3u003cpu003eTest the insulation performance of the cell after sealing and edge sealing . u003c/pu003e12. Vacuum drying u003cpu003eUsing the vacuum to dry the battery, completely exhaust the humid gas in the battery to be filled to ensure the quality of the battery. u003c/pu003e13. Liquid injection u003cpu003eInject electrolyte into the battery injection port. The relative humidity should be below 1%RH in a dry glove box. u003c/pu003e14. Seal 3u003cpu003eAfter filling the electrolyte, seal the filling port and complete it in a dry glove box. u003c/pu003e15. Testingu003cpu003eCheck whether the internal resistance of the battery and the amount of liquid injection meet the design requirements. u003c/pu003e16. Charging and formingu003cpu003erefers to the first charge or the first few charge and discharge processes when the battery is just made, each battery is connected to the computer and the performance indicators of each battery are monitored and recorded from time to time . u003c/pu003e17. Pumpingu003cpu003eThe battery will produce gas after being charged, and the gas in the battery will be pumped out to a vacuum. u003c/pu003e18. Edge sealing 4u003cpu003eThe right side of the battery is sealed to ensure the sealing performance of the battery. u003c/pu003e19. Demolitionu003cpu003eUse an automatic folding machine to cut off the excess aluminum-plastic composite film on both sides of the battery and automatically complete the folding. u003c/pu003e20. Chemical composition and capacitance detectionu003cpu003eUse high-precision chemical composition and capacitance detection equipment to sort and classify the battery capacity. Each battery is connected to a computer and the performance indicators of each battery are monitored and recorded from time to time. u003c/pu003e21. Aging testu003cpu003eAfter the battery has been tested for internal resistance, voltage, appearance, capacity, size, etc., it will be sorted and stored in batches. The storage conditions are room temperature 10~45℃, humidity 65-20%, and the aging period is 30 days. During the battery aging period, the battery should be re-checked regularly every 7 days. u003c/pu003e22. Assembly u003cpu003eWhen the battery cell reaches the aging period, it can be assembled according to customer requirements (it can be combined into many different assembly methods). When assembling, the voltage and internal resistance of the batch of batteries must be fully inspected. u003c/pu003e23. Ex-factory inspectionu003cpu003eInspect the performance indexes of finished batteries according to GB/T18287-2000. OQC can only leave the factory after passing the sampling inspection in strict accordance with GB/T2828.1. u003c/pu003eTwenty-four. Packagingu003cpu003eThe product packaging is composed of an inner packaging plastic pallet and an outer packaging double corrugated carton, and then packed into the entire pallet and tied with strapping, and stretch film moisture-proof measures to ensure product transportation It is safe and meets the requirements of GB191-1990 packaging, storage and transportation pictorial signs. u003c/pu003eu003c/pu003e
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