What is the cause of the explosion of lithium batteries?

Analysis of the causes of lithium battery explosion. 1. Internal short circuit. Due to the internal short circuit phenomenon, the battery core discharges with a large current, and a large amount of heat occurs, which burns the diaphragm and causes a greater short circuit phenomenon. In this way, the battery core will have a high temperature, causing the electrolyte to decompose into gas, causing the internal If the pressure is too high, when the 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. 7. External short-circuit The external short-circuit may be caused by improper operation or misuse. Due to the external short-circuit, the battery discharge current is large, which will cause the battery core to heat up, and the high temperature will shrink the diaphragm inside the battery cell or completely break it, causing the internal Short circuit and explode. 8. Thermal runaway lithium battery has the risk of explosion because of a process called thermal runaway in the reaction inside the battery. Thermal runaway is a positive energy feedback cycle: increased temperature will cause the system to heat up, and the system will heat up and increase the temperature, which in turn makes the system hotter. Too high ambient temperature and frequent overcharging will cause thermal runaway of the lithium battery, which may eventually cause fire or explosion. 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: How to deal with battery leakage?