8 Packaging Processes For Lithium Polymer Batteries
Lithium battery soft packs have good safety performance, so they are widely used in electronic digital products, medical equipment, medical equipment, and handheld electronic equipment. I believe that many people do not understand the packaging process of lithium battery soft packs. Technology will share with you the packaging process of lithium battery soft pack through this article.
1. Soft pack battery.
The soft-wrapped cells that everyone has encountered are all cells that use aluminum-plastic film as the packaging material. Different packaging materials determine the use of different packaging methods. Welding is used for packaging batteries.
2. The outer layer of outer packaging, aluminum plastic film.
The aluminum-plastic composite film can be roughly divided into three layers – the inner layer is the bonding layer, and polyethylene or polypropylene materials are mostly used to play the role of sealing and bonding; the middle layer is aluminum foil, which can avoid the infiltration of water vapor from the outside of the battery. At the same time, the leakage of the internal electrolyte is avoided; the outer layer is a protective layer, and high-melting polyester or nylon materials are mostly used, which have strong mechanical properties, avoid damage to the battery by external forces, and protect the battery.
3. Aluminum-plastic film stamping forming process.
The soft-packed cells can be designed into different sizes according to the needs of customers. After the external dimensions are designed, the corresponding molds need to be opened to stamp and form the aluminum-plastic film. The forming process is also called punching, which is to use a forming die to punch out a core-rolling hole on the aluminum-plastic film.
4. Packaging side sealing, top sealing process.
The packaging process includes two processes of top sealing and side sealing. The first step is to put the wound core into the punched pit, and then fold the unpunched side along the punched pit side.
5. Liquid injection and pre-sealing process.
After the soft-packed cells are sealed on the top side, x-ray must be done to check the parallelism of the core, and then enter the drying room to remove moisture. After standing in the drying room for a few times, it enters the liquid injection and pre-sealing process.
6. Standing, forming, fixture shaping.
After the liquid injection and sealing are completed, the cells need to be left to stand. According to the difference in the production process, it is divided into high temperature static and normal temperature static. The effect of standing is to allow the injected electrolyte to fully infiltrate the machine. , which can then be used to make
7. Two sealing process.
During the second seal, the first step is to puncture the air bag with a guillotine knife, and at the same time, vacuumize, so that the gas and a part of the electrolyte in the air bag will be drawn out. Then immediately carry out the second seal to ensure the airtightness of the cell. Finally, the air bag is cut off, and a soft-packed cell is almost formed.
After the two air bags are cut, it is necessary to trim and fold the edges to ensure that the width of the cells does not exceed the standard. The folded cells will enter the capacity distribution cabinet for capacity separation, which is actually a capacity test.
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