Analysis of Polymer Lithium Battery Case Packaging Technology: Key Requirements and Core Values​

In the polymer lithium battery industry, Polymer Lithium battery Case, as the core barrier isolating the battery cell from the external environment, its packaging technology directly determines the safety, stability and service life of the battery. Currently, the mainstream LiSoCl2 Battery Case adopts the aluminum-plastic film packaging form. This packaging material not only needs to have basic mechanical protection capabilities, but also meet a series of strict technical standards to adapt to the production process and usage requirements of the battery cell. This article will focus on the packaging technology of Lithium Ion Battery Pack,  systematically break down its core technical requirements, and help industry practitioners deeply understand the relevant technical points.​

In the battery cell packaging process of Aluminum Prismatic Casing, it usually goes through the key processes of 3 times of vacuum pumping and 3 times of hot-press sealing. Due to the easy existence of burrs on the edges of the copper mesh and aluminum mesh inside the battery cell, the soft packaging aluminum-plastic film of Customized Prismatic Battery Cell Casings will shrink inward during the vacuum pumping and dust collection stage. During this process, if the puncture resistance of the aluminum-plastic film is insufficient, the burrs are likely to pierce the inner film and touch the inner aluminum foil layer, leading to direct contact between the electrolyte, hydrofluoric acid and the aluminum foil, which in turn causes corrosion of the aluminum foil. In severe cases, problems such as battery swelling and leakage may occur, eventually resulting in battery scrapping. Therefore, excellent puncture resistance is the basic premise to ensure the packaging reliability of Lithium -ion Electric Bike Battery Pack.​

During the second and third hot-press sealing stages of the battery cell, the inner film surface of Lithium-ion Battery Pack is prone to adhering to electrolyte. This puts forward clear requirements for the pollution resistance of the heat seal layer of MnO2 Battery Case, which needs to ensure that the inner film can still achieve stable sealing when contaminated with electrolyte. At the same time, the heat seal layer also needs to have high strength characteristics, and a high peeling strength must be maintained between the inner film layers to ensure the tightness and firmness after the third hot-press sealing, avoiding electrolyte leakage or external air entry due to loose sealing, which affects battery performance and safety.​

To ensure the surface of the polymer lithium battery cell is flat and smooth, the square edge seal is flat, the seal is tight and firm, reduce the overall size of the battery cell, and then adapt to the needs of mechanized mass production, improve production efficiency and output, the soft packaging aluminum-plastic film of LiFePO Battery Pack must have good cold stamping formability. High-quality cold stamping formability can make the aluminum-plastic film better fit the shape of the battery cell during the forming process, avoid wrinkles, damage and other problems, lay a good foundation for the subsequent sealing process, and at the same time improve the appearance quality and production consistency of polymer lithium batteries.​

In summary, the packaging technology of LiSoCl2 Battery Case is one of the core links in the production and manufacturing of polymer lithium batteries. The various technical performances of its aluminum-plastic film materials are directly related to the safety, performance and production efficiency of the battery. With the continuous expansion of the application of polymer lithium batteries in new energy vehicles, energy storage, consumer electronics and other fields, the requirements for the packaging technology of Polymer Lithium battery Case will continue to increase, promoting the continuous innovation and upgrading of related materials and process technologies.