Reasons for the explosion of lithium batteries in electric vehicles

1. The capacity of the negative electrode of the lithium battery is lacking. When the capacity of the negative electrode of the lithium battery is lacking, the lithium atoms appearing during charging cannot penetrate into the interlayer structure of the graphite of the negative electrode, and will precipitate on the surface of the negative electrode to form crystals. Long-term formation of crystals in a lithium battery will cause a short circuit. At this time, the battery cell is discharged rapidly, and a lot of heat will appear, which will burn the diaphragm. High temperature will cause the electrolyte to analyze into gas. When the pressure is too high, the cell will explode. 2. The water content is too high. When charging, the water can react with lithium to generate lithium oxide, which will cause the capacity of the battery cell to be lost. It is easy to overcharge the battery and generate gas. The analysis voltage of water is low. A very simple analysis of the generated gas, when this series of generated gases will increase the internal pressure of the cell, when the shell of the cell cannot withstand it, the cell will explode. 3. Internal short circuit. The short circuit of the internal battery core constitutes a large current discharge, and a lot of heat occurs, which burns the diaphragm and constitutes a larger short circuit phenomenon, which will cause the electrolyte to analyze into a gas. If the internal pressure is too high, the battery core will explode. 4. When the lithium battery is overcharged and the battery cell is overcharged, the excessive release of lithium in the positive electrode will cause changes in the structure of the positive electrode, and too much lithium will be unable to penetrate into the negative electrode, and it will also simply form the surface of the negative electrode to deposit lithium, and, When the voltage reaches 4.5V or more, the electrolyte will analyze and produce a lot of gas. All of the above may constitute an explosion. 5. External short circuit. External short circuit may be caused by the wrong connection of positive and negative electrodes. Because of external short circuit, the battery discharge current is very large, which will heat the battery core. High temperature will shorten or completely destroy the diaphragm inside the battery core, forming the internal part. Short circuit and explode. 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 iron phosphate battery maintenance tips