Why do lithium-ion batteries explode?

Because of many fires and explosions caused by lithium-ion batteries, lithium-ion batteries are not completely accepted by consumers. Although most of the time, lithium-ion batteries are in a very stable state, so why do lithium-ion batteries explode? The following points are for your reference, and I hope to clarify your confusion; 1. The capacity of the negative electrode of the lithium ion battery is insufficient. When the capacity of the negative electrode of the positive part of the lithium ion battery is insufficient, the lithium atoms appearing during charging cannot be inserted into the interlayer structure of the negative electrode graphite. In, it will precipitate on the surface of the negative electrode to form crystals. Long-term formation of crystals in lithium-ion batteries can cause short circuits. At this time, the battery cells are discharged rapidly, 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 battery, when the outer shell of the battery cannot withstand it, the battery will explode. 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. 4. When the lithium-ion battery is overcharged, the lithium-ion battery is over-released, which will change the structure of the positive electrode. If too much lithium is released, it is easy to be unable to be inserted into the negative electrode. It is also easy to cause lithium deposition on the surface of the negative electrode. When it reaches 4.5V or more, the electrolyte will decompose to produce a large amount of gas. All of the above may cause an explosion. 5. External short circuit The external short circuit may be caused by the wrong connection of the positive and negative electrodes. Due to the external short circuit, the battery discharge current is very large, which will cause the battery core to heat up, and the high temperature will shrink or completely destroy the diaphragm inside the battery core, causing an internal short circuit. , Which exploded. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Lithium battery cathode material production process