If a battery catches fire, use water to put it out.
Compared to dry powder fire extinguishers, water has a better cooling effect. Since many of them are internal short circuits and external short circuits of the battery, high external temperature can also cause the battery to burn. Whether it is an internal short circuit or an external short circuit, the short circuit causes excessive current, which in turn causes heat and combustion. An internal short circuit causes the battery temperature to increase. As the temperature increases, the chemical materials inside the battery begin to react more quickly, thus widening the scope of the short circuit. The short circuit current will increase further. the battery will burn out soon.
Generally, when an object catches fire, there are three methods that can be used to extinguish the incendie. They must isolate the air, isolate the burning material and prevent the object from reaching the ignition point.
Methods for extinguishing lithium battery fires are as follows:
1. Use a fire extinguisher to put out the flames. Usually after that the fire is extinguished and the battery continues to smoke. Most fire extinguishers can achieve this effect.
2. Since lithium batteries will reignite if not cooled, it is very important to use plenty of water to cool the batteries. (Note) Continue watering.
3. It is best to move the burning battery outside and then call the fire department to deal with it.
4. Smoking is harmful to the body. Do not breathe smoke.
?Causes of lithium battery fires:
1. Insufficient capacity of the negative electrode of the lithium-ion battery
When the electrodenegative of the positive electrode of the lithium-ion battery. When the site capacity is insufficient, the lithium atoms that appear during charging cannot be inserted into the graphite interlayer structure of the negative electrode and will precipitate on the surface of the negative electrode to form crystals. Long-term crystal formation in lithium-ion batteries can lead to short circuits. At this time, the cells discharge rapidly, generating a large amount of heat and burning the separators. High temperature will cause the electrolyte to decompose into gas. When the pressure is too high, the battery core will explode.
2. The moisture content is too high
During charging, water may react with lithium to generate lithium oxide, which will cause the battery to lose capacity and be easily overcharged. Battery. Gas is generated. The decomposition voltage ofwater is low. It is easy to decompose to generate gas during charging. When this series of gases generated increases the internal pressure of the battery core, when the battery core shell cannot resist. This, the battery core will explode.
3. Internal short circuit
The internal short circuit of the cell causes a large current discharge, a large amount of heat, burns the diaphragm and causes a larger short circuit, which causes the decomposition of the electrolyte into gas, if the internal pressure is too high, the battery core will explode.
4. Overcharging of lithium-ion batteries
When the battery cell is overcharged, excessive release of lithium from the positive electrode will cause the structure of the positive electrode to change, and also a large amount of released lithium will easily make it impossible to insert. In the negative electrode it is equalment easy to cause lithium precipitation on the surface of the negative electrode. In addition, when the voltage reaches more than 4.5V, the electrolyte will decompose to produce a large amount of lithium. quantity of gas. All of the above can cause an explosion.
5. External short circuit
External short circuit may be caused byDue to incorrect connection of positive and negative poles, due to external short circuit, the battery discharge current is very large, which will cause the battery core to heat up. The high temperature will cause the diaphragm inside the battery core to shrink or shrink. completely damaged, causing an internal short circuit and therefore an explosion.