What are the reasons for the fire and explosion of lithium batteries?

Reasons for the explosion and fire of lithium batteries 1. The capacity of the negative electrode of the lithium battery is insufficient. When the capacity of the negative electrode of the lithium battery is insufficient, the lithium atoms appearing during charging cannot be inserted into the interlayer structure of the negative electrode graphite, and will be deposited on the surface of the negative electrode. crystallization. The long-term formation of crystals in lithium batteries can cause short circuits. At this time, the battery cells are rapidly discharged, and a lot of heat will appear, which will burn the diaphragm. High temperature will decompose the electrolyte into gas, and when the pressure is too high, the cell will explode. 2. When the water content is too high, the water can react with lithium to generate lithium oxide, which causes the capacity of the battery cell to be lost, and the battery cell is easily overcharged to generate gas. The decomposition voltage of water is low, and the battery is very low during charging. It is easy to decompose and generate gas. When this series of generated gases will increase the internal pressure of the cell, the cell will explode when the shell of the cell cannot withstand it. 3. Internal short circuit The short circuit of the internal battery cell causes a large current discharge, a large amount of heat occurs, which burns the diaphragm, and causes a greater short circuit phenomenon, which will cause the electrolyte to decompose into gas, and the internal pressure is too high, and the battery cell will explode. Fourth, when the lithium battery is overcharged, the positive lithium will be excessively released, which will change the structure of the positive electrode. If too much lithium is released, it is easy to be unable to insert into the negative electrode, and it is also easy to cause lithium on the surface of the negative electrode, and when the voltage reaches Above 4.5V, the electrolyte will decompose and process a large amount of gas. All of the above may cause an 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.