What is the reason for the bulge of lithium polymer battery

1. What are the reasons for the bulging of lithium polymer batteries? 1. Poor packaging, air moisture enters the inside of the cell during the production process, causing the electrolyte to decompose and produce gas. 2. Excessive water content in the battery cell: In the process, once the water content exceeds the standard, the electrolyte will fail and produce gas. 3. Corrosion will also cause corrosion of the polymer soft-packed lithium ion battery core, and the aluminum layer will be consumed by the reaction, losing its barrier to water, and causing flatulence. 4. The surface of the lithium ion cell is damaged by external force, and the puncture causes moisture to enter the cell. In addition, the chemical properties of lithium-ion materials are too active, which brings extremely high risks. When lithium ion metal is exposed to the air, it will undergo a violent oxidation reaction with oxygen. 5. Knock: The aluminum material is easy to deform, and it will be easily knocked. The larger the battery core and the larger the air bag, the easier it is to damage. 6. Short circuit: The contact between the positive and negative poles leads to a short circuit, and the polymer lithium ion battery cell produces gas or even smoke. 7. Internal short circuit: Shrinkage, curling, breakage, and burr piercing the separator of polymer lithium ion battery will cause internal open circuit and bulge. 8. The polymer soft pack battery is overcharged or over-discharged, and the protective plate is abnormal, and the battery cell will be seriously outgassed. 9. Lithium-ion battery swelling will occur if it is not used for a long time. Li-ion battery processing manufacturers have found that air is conductive to a certain extent. Therefore, if the battery is left for too long, it is equivalent to direct contact between the positive and negative electrodes of the battery. Chronic short circuit. 10. Overcharging and over-discharging problems during the use of lithium-ion batteries. These two factors will cause a violent reaction similar to a short circuit inside the battery during use, generating a lot of heat, which will cause the electrolyte to decompose and vaporize, and the battery will bulge. 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 post: Who is more durable polymer battery or 18650 battery?