What are the manufacturing processes for lithium battery packs?

The manufacturing process of the lithium battery pack mainly includes the aluminum plastic film forming process, the top side sealing process, the liquid injection, the pre-sealing process, the standing, the forming, the jig shaping process, etc. In the aluminum-plastic film forming process, the surface of the aluminum foil is treated with water to wash out the oil and chromic anhydride passivation treatment. Due to the tension of the water surface, the oil in the micropores of the aluminum foil cannot be cleaned, resulting in defects in the subsequent process. The surface of aluminum foil is coated with UV layer, the stiffness of aluminum foil is not good, and the dry method will simply cause wrinkles. When the adhesive is not effective when equipped, it will simply cause the delamination and peeling of the aluminum-plastic film. When the liquid injection lithium battery pack is in the process of liquid injection, if the water content in the liquid injection chamber is high, it will react with the solute lithium hexafluorophosphate to generate HF acid, which will have a great impact on the electrochemical performance and safety performance of the battery. If the lithium battery pack stays in the injection chamber for too long, it will absorb more water and also generate HF acid. In the process of chemical conversion, the formation of SEI film will be affected by composition data, external temperature and other aspects. If there is a problem in the formation of the SEI film, it will increase the irreversible capacity of the lithium battery pack for the initial charge and discharge, and will also reduce the charge and discharge efficiency of the electrode material. 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. Previous post: What is the difference between a power lithium ion battery and an energy storage battery?