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 negative electrode of the positive electrode of the lithium-ion battery. When the site capacity is insufficient, the lith atomsium that appears 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 of water is low. It is easy to decompose to generate gas during charging. When this series of gases generated increasesment 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 also easy to cause lithium precipitation on the surface of the negative electrode. Furthermore, when the voltage reachest more than 4.5 V, 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 can be caused by poor connection of the positive and negative poles. Due to the external short circuit, the battery discharge current is very high. large, which will cause the battery core to heat up, and the high temperature will cause the diaphragm inside the battery cell to shrink or completely damage, causing an internal short circuit and thus explosion.