Why does polymer lithium battery charge swell

The polymer lithium battery is swollen, indicating that the battery is broken, and your battery should be a polymer lithium battery. This may happen if the battery is overcharged or discharged at high temperature. It is theoretically designed to stop charging after charging overflows. The user can only pay attention to the safety regulations during use. What matters are internal factors such as battery quality and charge management. In the polymer lithium battery system currently developed, polymer materials are mainly used in the positive electrode and the electrolyte. Cathode materials include conductive polymer or inorganic compounds used in general lithium batteries. The electrolyte can use solid or colloidal polymer electrolytes, or organic electrolytes. Generally, lithium ion technology uses liquid or colloidal electrolytes, so it must be strong. The secondary packaging to contain the flammable active ingredients, which adds weight, and also limits the flexibility of size. There is no excess electrolyte in the polymer lithium ion process, so it is more stable, and it is not easy to cause dangerous situations due to battery overcharging, collision or other damage, and overuse. Thickness changes caused by lithium ion insertion. When the battery cell is charged, lithium ions are extracted from the positive electrode and inserted into the negative electrode, causing the gap between the negative electrode layers to increase, and expansion occurs. Generally speaking, the thicker the battery core, the greater the expansion; the expansion is caused by poor process control. In the manufacturing process, such as slurry dispersion, C/A ratio dispersion, and temperature control will directly affect the degree of expansion of the battery. Especially water, because the highly active lithium carbon compound formed by charging is very sensitive to water, a violent chemical reaction occurs. The reaction gas causes the internal pressure of the cell to increase, which adds to the expansion behavior of the cell. The flatulence bulge of polymer soft-packed lithium battery is related to many factors such as the quality of the lithium battery, the method of use, and the environment. 1. Poor packaging: air moisture enters the inside of the cell during the production process, causing gas to appear in the electrolyte analysis. 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: 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, puncture causes moisture to enter the inside of the battery. In addition, the chemical properties of lithium materials are too active, which brings extremely high risks. When exposed to the air, lithium metal 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 easier it is to damage. 6. Short circuit: The contact between the positive and negative electrodes causes a short circuit, and the polymer lithium battery cell generates gas or even smoke. 7. Internal short circuit: Shrinkage, curling, breakage, and burr piercing the isolating film of the polymer lithium battery will cause internal open circuit and bulge. 8. Overcharge and overdischarge: The polymer soft pack battery is overcharged or overdischarged, and the protection board is abnormal, and the battery cell will be seriously outgassed. 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: Why is the battery of a new energy vehicle not durable after charging?