The importance of aluminum plastic film from the processing and packaging process of soft-packed lithium batteries

The importance of aluminum-plastic film can be seen from the processing and packaging process of soft-packed lithium batteries. 1. Soft-covered cells. Now we see soft-clad cells use aluminum-plastic film as the core packaging material. Broadly speaking, lithium-ion soft- Clad cells are divided into two types, one is the use of aluminum-plastic film as the core of the packaging, the other is the core of the metal shell, the core of the metal packaging and the steel shell, aluminum shell and so on. Different packaging materials determine the use of different packaging methods, polymer soft-clad cores choose thermal packaging, and metal packaging cores choose welding methods. 2. Packaging soft film-aluminum-plastic film aluminum-plastic composite film can be divided into three layers, the inner layer is the adhesive layer, and polyethylene or polypropylene materials are mostly used for sealing and bonding; the middle layer is aluminum foil, which can prevent the outside of the battery Water vapor enters to prevent leakage of internal electrolyte. The outer layer is the maintenance layer, and the polyester or nylon material with high melting point is selected, which has strong mechanical properties to prevent external damage to the battery and serve the purpose of battery maintenance. 3. The punching and forming process of aluminum-plastic film can be planned into different sizes according to customer requirements. After the outline dimensions are planned, the corresponding mold will be sent out to make the aluminum plastic film stamping and forming. The forming process is also called a hole, which is a core roll on the aluminum-plastic film through the use of a molding die. 4. Packaging side and top sealing technology The packaging process includes top sealing and side sealing. First put the core into the blanking pit, and then put the half of the unloaded side into the blanking pit. 5. After the top of the soft core is sealed by the liquid injection pre-sealing process, an x-ray is required to check the parallelism of the coil core, and then enter the drying room for dehydration. After standing in the drying room for a few minutes, the process of injection and pre-sealing was analyzed. 6. Static, injection and injection after the completion of the molding and fixture molding, according to different processing processes, the requirements of static cells are divided into normal temperature and high temperature static and static. The purpose of static is to allow the injection of electrolyte to fully moisturize, and then it can be done. This is the initial charge of the battery, but it will not be charged at the highest voltage, and the charging current is very small. The purpose is to form a stable SEI film on the electrode surface, which is also a process of activating cells. During this process, a certain amount of gas is released, which is why a bag should be kept. Some factories will use jig machine conversion, put the battery into the jig machine, and then put it on the conversion cabinet. This gas will be fully compressed into the air to form a better electrode interface together. After the formation is completed, some cells, especially thick cells, will deform due to large internal stress. Therefore, some factories have set up a conversion process after molding, which is also called fixture baking. 7. In the second seal process of the two seals, the guillotine first pierces the airbag and evacuates it together, so that the gas and part of the electrolyte in the airbag are drawn out. Then seal both immediately to ensure the air tightness of the cells. After all, after the airbag is cut, a soft bag is basically formed. 8. In the subsequent process, after sealing and cutting the airbag, the edges should be cut and folded to ensure that the width of the battery will not be overrun. The folded battery will enter the capacity cabinet for capacity division, which is actually a capacity test. Capability division, after the completion of the qualified ability cells will enter the follow-up process, including appearance inspection, paste yellow glue, edge voltage detection, tab welding, transfer, etc., according to the process that the customer wants to add or reduce, after all, OQC inspection, then packaging And transportation. 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 it. Previous: Is it safe if the motorhome uses lithium batteries?