Why do electric vehicle lithium batteries explode?

By GoodBoy
Because lithium batteries explode and catch fire, accidents that cause casualties occur from time to time. Today, I will share with you the reasons for the explosion of lithium batteries. Due to the popularity of lithium batteries, many electric vehicles on the market now use lithium batteries, which also causes accidents where lithium batteries explode and catch fire, causing casualties. What is the cause of this, today I will give you a good science.
  1. Insufficient capacity of negative electrode of lithium battery
When the capacity of the negative electrode part of the positive electrode part of the lithium battery is insufficient, the lithium atoms generated 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 to form crystals. The long-term formation of crystals in lithium batteries will lead to a short circuit. At this time, the battery cell will be discharged rapidly, which will generate a lot of heat and burn out the diaphragm. The high temperature will cause the electrolyte to decompose into gas, and when the pressure is too high, the cell will explode. Why do electric vehicle lithium batteries explode? There are five reasons Two, the moisture content is too high When charging, water can react with lithium to form lithium oxide, which will cause the capacity loss of the battery cell, and easily cause the battery cell to overcharge and generate gas. The decomposition voltage of water is low, and it is easy to decompose and generate gas during charging. A series of generated gases will increase the internal pressure of the cell, and when the shell of the cell cannot withstand it, the cell will explode.Also read:48V 100Ah Lithium Ion Battery
  1. Internal short circuit
The internal short circuit of the battery cell causes a large current discharge, which generates a lot of heat and burns the diaphragm, and causes a larger 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. Why do electric vehicle lithium batteries explode? There are five reasons
  1. Lithium battery overcharge
When the cell is overcharged, the excessive release of lithium from the positive electrode will change the structure of the positive electrode, and too much lithium released will easily fail to insert into the negative electrode, and it will also easily cause lithium to be deposited on the surface of the negative electrode. Moreover, when the voltage reaches 4.5V or more, The electrolyte will decompose and produce a large amount of gas. All of the above may cause an explosion.
  1. 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 to heat up. The high temperature will cause the diaphragm inside the battery to shrink or be completely damaged, resulting in an internal short circuit and explosion.Also read:10kwh lithium battery 48v