What are the important assembly methods for soft-pack lithium-ion batteries? Do you know each other?

The soft-packed lithium-ion battery in the aluminum-plastic film forming process can be designed into different sizes according to the needs of customers. When the external dimensions are designed, the corresponding mold must be opened to form the aluminum-plastic film. Sometimes according to the design requirements, a small hole will be punched in the position of the air bag to expand the volume of the air bag. Top-side sealing process The top-side sealing process is the first packaging process for soft-packed lithium batteries. The top side seal actually includes two processes, the top seal and the side seal. First put the wound core into the punched pit, and then fold the packaging film in half along the dotted line. After the core is placed in the pit, the entire aluminum plastic film can be placed in the fixture, and the top and side sealing are performed in the top-side sealing machine. After the liquid injection and pre-sealing process soft-pack batteries are sealed on the top side, X-ray is required to check the parallelism of the cores, and then go into the drying room to remove moisture. After a certain period of time in the drying room, it enters the liquid injection and pre-sealing process. After the cell is sealed on the top side, there is only one opening in the air bag, and this opening is used for liquid injection. After the injection is completed, the horse leader is required to pre-seal the side of the air bag, which is also called a letter. After a package is completed, the core is theoretically completely separated from the outside. After the process of standing, forming, and fixture shaping, after the liquid injection and one seal are completed, the cells must first be left to stand. According to the difference of the process, it will be divided into high temperature standing and normal temperature standing. The liquid is full and infiltrates the pole piece. Then the batteries can be used to make them. The chemical result is the first charging of the battery, but it will not be charged to the highest voltage used, and the charging current is also very small. The goal of the formation is to form a constant SEI film on the surface of the electrode, which is equivalent to a process of activating the cell. In this process, there will be a certain amount of gas, which is why the aluminum plastic film needs to reserve an air bag. After the formation, some batteries, especially thick batteries, may show certain deformation due to large internal stress. Therefore, some factories will configure a fixture shaping process after chemical conversion, which is also called fixture baking (baking). The second sealing process just said that gas will be present during the formation process, so we have to extract the gas and then conduct the second packaging. Some companies here have two processes: Degassing (exhaust) and second seal. There is a process of cutting the air bag at the back. Here I call them the second seal in general. In the second seal, the air bag is first pierced with a guillotine, and vacuum is drawn at the same time, so that the gas and a small part of the electrolyte in the air bag will be drawn out. Then immediately the second sealing head is encapsulated in the second sealing area to ensure the airtightness of the cell. Finally, the encapsulated cell is cut off the air bag, and a soft-packed cell is basically formed. The second seal is the last packaging process of the lithium-ion battery, and the reason is still communicated with the previous thermal packaging, so I won't repeat it. In the follow-up process, after the second air bag is cut, the edge trimming and folding are performed, which is to cut the one edge and the second edge to the appropriate width, and then fold it to ensure that the width of the battery does not exceed the standard. After folding, the battery cells can be placed in the capacity-splitting cabinet for capacity distribution. In fact, it is a capacity test to see if the capacity of the battery core has reached the specified minimum value. In principle, all batteries must be tested before leaving the factory to ensure that batteries with substandard capacity will not be delivered to customers. However, when the output of battery cells is large, some companies will divide the capacity of the departments and use statistical probability to determine the passing rate of the battery capacity of the batch. 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: What are the basic charging precautions for lithium-ion batteries?