What are the factors that cause the explosion of lithium batteries?

Analysis of the principle of lithium battery explosion 1. Internal short circuit. Due to the internal short circuit phenomenon, the battery cell is discharged with a large current, and a large amount of heat occurs, which burns the diaphragm and causes a greater short circuit phenomenon, so that the battery cell will have a high temperature and cause the electrolyte to decompose. It becomes a gas, causing the internal pressure to be too high. When the outer shell of the battery cell cannot withstand this pressure, the battery cell will explode. During laser welding, heat is conducted to the positive electrode ear through the shell, making the temperature of the positive electrode ear high. If the upper adhesive paper does not separate the positive electrode ear and the diaphragm, the hot positive electrode ear will burn or shrink the diaphragm paper, causing an internal short circuit. And it formed an explosion. 2. When the customer spot welding the negative ear with high-temperature adhesive paper, heat is conducted to the negative ear. If the high-temperature adhesive paper is not attached properly, the heat on the negative ear will burn the diaphragm, causing an internal short circuit and an explosion. 3. If the bottom glue is not completely covered by the bottom, when customers spot welding at the bottom aluminum-nickel composite tape, a lot of heat will appear on the bottom shell wall, which will conduct the bottom of the pole core. If the high temperature adhesive tape does not completely cover the diaphragm, it will burn. The diaphragm is broken, causing an internal short circuit and an explosion. 4. When the moisture content is too high, the moisture can react with the electrolyte in the battery cell, process gas, and when charging, it can react with the generated lithium to generate lithium oxide, which will cause the capacity of the cell to be lost, and it is easy to overcharge the cell. Generate gas, the decomposition voltage of water is low, and it is easy to decompose to generate gas when charging. When this series of generated gas will increase the internal pressure of the cell, when the shell of the cell cannot withstand it, the cell will explode . 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 are the correct ways to use lithium batteries?