What are the production methods of lithium ion batteries

1. Treatment of the negative electrode material (1) First, the large particle size and ultra-fine powder must be separated from the required particle size to prevent chemical reactions and improve the safety of the battery. (2) The method of increasing the porosity of the material surface can increase the capacity by more than 10%. At the same time, the safety performance of the battery can also be improved under the condition of constant C/A ratio. 2. The control of the pulping process (1) The pulping process generally uses special chemical reagents to minimize the tension between the positive and negative slurry. Improve the compatibility between the groups and prevent the agglomeration of materials during the mixing process. (2) During coating, the gap between the base material and the nozzle should be kept below 0.2mm, so that the surface of the formed plate is smooth and free of defects such as particles, dents, scratches, etc. (3) The storage time of the slurry is maintained at more than 6 hours, and it is ensured that there is no self-aggregation and agglomeration inside the slurry. The uniform slurry is the uniformity of the distribution on the substrate of the positive and negative electrodes of the battery, which improves the consistency of the battery. 3. Adopting advanced pole piece manufacturing equipment (1) Advanced equipment can not only guarantee the quality of the pole piece, but also greatly improve the uniformity of the pole piece of the cell and increase the qualification rate of the cell. (2) The density error value on the single plate of the coating machine should be small and controlled within a certain range. (3) Ensure that the taper of the roller press should not exceed 4μm, and ensure that the thickness of the processed electrode plates is consistent. In addition, the equipment should have a good dust collection system to prevent short circuits caused by floating dust. (4) The slitting machine generally uses a roller knife type cutter, and then performs continuous slitting equipment, so that the cutting effect does not have defects such as lotus leaves, burrs and so on. 4. Advanced sealing technology At present, domestic lithium-ion batteries generally use laser (LASER) welding and sealing technology, which uses a YAG rod (yttrium aluminum garnet) laser cavity to emit a single frequency under the excitation of strong light. The light (λu003d1.06mm) is then refracted and focused into a beam, and then the focus is gathered between the barrel and the cover of the battery core to fuse them into one body to achieve the purpose of sealing and fusing the cover and the barrel. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.