Why do polymer soft-packed lithium batteries get gassy?

The cause of the bulging of polymer soft-packed lithium battery The bulging of polymer soft-packed lithium battery is related to the quality of the lithium battery, the method of use, the environment and many other factors. 1. Poor packaging: air moisture enters the inside of the cell during the production process, causing the electrolyte to decompose and produce gas. 2. The battery contains excessive water content: In the process, once the water content exceeds the standard, the electrolyte will fail and cause gas. 3. Corrosion: The polymer soft-packed lithium battery core is corroded, the aluminum layer is consumed by the reaction, and it loses its use as a barrier to water, resulting in flatulence. 4. Surface damage: damaged by external force, piercing causes moisture to enter the inside of the cell. In addition, the chemical properties of lithium materials are too active, which brings extremely high risks. When lithium metal is exposed to the air, it will undergo a violent oxidation reaction with oxygen. 5. Knocking: Aluminum material is easy to deform, and it will be easily knocked. The larger the battery cell and the larger the air bag, the more likely it is to be damaged. Precautions for polymer soft-packed lithium batteries Do not overcharge 1. Lithium has very active chemical properties and is easy to burn. When the battery is charged and discharged, the interior of the battery continues to heat up, the gas that appears during the activation process expands, and the internal pressure of the battery increases. , The pressure reaches a certain level, if there is a scar on the shell, it will rupture, causing leakage, fire, or even explosion. The polymer lithium battery will only expand. 2. Pay attention to the prevention of short-circuit polymer soft-packed lithium batteries from overcharging and over-discharging during the charging process, and preventing internal short-circuits and external short-circuits. Although, most lithium batteries now have short-circuit protection circuits and explosion-proof wires. In many cases, this protection circuit may not be useful in various situations, and the use of explosion-proof wires is also limited. 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: How to charge and use the lithium battery of electric vehicle correctly?