Analysis of the cause of lithium battery bulge

1. Overcharging caused by overcharging will cause all the lithium atoms in the positive electrode material to run into the negative electrode material, causing the originally plump grid of the positive electrode to deform and collapse, which is also an important reason for the decline in the power of the lithium battery pack. In this process, there are more and more lithium ions in the negative electrode, and the excessive accumulation makes the lithium atoms grow out of the tree stump crystals, causing the battery to swell. 2. The bulging SEI film caused by over-discharge can be used for maintenance of the negative electrode material, so that the material structure is not easy to collapse, and the cycle life of the electrode material can be added. The SEI film is not static, there will be a little change in the charge and discharge process, the important thing is that some organic matter will undergo reversible changes. After the battery is over-discharged, the SEI film is reversibly broken, and the SEI that maintains the negative electrode material is damaged, which causes the negative electrode material to collapse, thereby forming the bulging phenomenon of the lithium battery. If the charger used does not meet the requirements, it may cause the battery to swell at the slightest level, or present a safety accident or even an explosion. 3. Processing and manufacturing process issues: The manufacturing level of lithium battery packs is uneven, the electrode coating is not uniform, and the processing technology is relatively rough. Disclaimer: The articles published on this website are all from the Internet. If there is any infringement, please contact to delete it. 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 article: What is the difference between fuel power battery and ordinary battery?