What is the root cause of the bulging of lithium-ion batteries?

One. The bulge caused by overcharging will cause all the lithium atoms in the positive electrode material to run into the negative electrode material, causing the original full grid of the positive electrode to deform and collapse, which is also an important reason for the decrease in the power of the lithium-ion battery pack. In this process, there are more and more lithium ions in the negative electrode. Too much extraction will cause the lithium atoms to grow out of the tree stump crystals, causing the battery to swell. two. The bulging SEI film caused by over-discharge will have a protective effect on the negative electrode material, so that the material layout is not easy to collapse, and the cycle life of the electrode material can be increased. The SEI film is not always stable, and there will be a little change in the charging and discharging process. The important thing is that the departmental organic matter will produce reversible changes. After the battery is too discharged, the SEI film will be reversibly broken, and the SEI that protects the negative electrode material will collapse after crushing, thereby forming the bulging phenomenon of the lithium ion battery. If the charger used does not meet the requirements, it may cause the battery to swell at the slightest degree, and may become a safety disorder or even explode. 3. Production and manufacturing process issues. Li-ion battery pack manufacturing issues, uneven electrode coatings, and relatively rough production processes. These three factors cause the lithium-ion battery pack to produce a violent echo similar to a short circuit during the use of the battery, generating a large amount of heat, which in turn causes the electrolyte to decompose and vaporize, and the battery rises. 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: What are the disadvantages of lithium-ion battery electric vehicles?