January 11, 2021
What is the cause of the fire on the mobile phone battery?
We all know that mobile phone batteries are lithium batteries, lithium batteries and lithium-ion batteries are great technologies that have brought tremendous changes and contributions to the storage and supply of global electrical energy. So, what are the causes of fire in mobile phone batteries?
What are the causes of fire in lithium batteries?
The essence of causing a fire in a lithium battery is that the shower's heat fails to be released as designed, causing internal and external combustion materials to ignite after ignition. The leading causes are external short circuits, external high temperature, and internal short circuits.
1. Internal short circuit
Due to the abuse of batteries, such as branch crystals caused by overcharge and over-discharge, impurities, and dust in the battery production process, they will deteriorate to pierce the diaphragm and produce micro-short circuits. The release of electric energy causes the temperature to rise, and the material chemistry caus by weather rise. The reaction expands the short-circuit path and forms a larger short-circuit current. This mutually accumulating and mutually reinforcing destruction leads to thermal runaway.
2. External short circuit
Take electric cars as an example. The probability of danger in actual vehicle operation is very low. One is that the vehicle system equipped with fuses and a battery management system BMS, and the other is that the battery can withstand a short-term high current impact. In the extreme case, the short-circuit point crosses the vehicle fuse, and the BMS fails. A long-term external short-circuit will generally cause weak issues in the circuit to burn out and rarely cause thermal runaway events in the battery. Now, more PACK companies have adopted adding fuses in the loop, which can more effectively avoid the hazards caused by external short circuits.
3. High temperature outside
Due to the characteristics of lithium batteries' structure, SEI membranes, electrolytes, ECs, etc., will undergo deco, position reactions at high temperatures. The electrolytes' decomposition products will also react with the positive and negative electrodes, and the cell membrane will melt and decompose. Various reactions lead to a large amount of heat generation. The melting of the diaphragm causes an internal short circuit, and the release of electrical energy increases heat production. This cumulative and mutually reinforcing destructive effect will cause the battery cell's explosion-proof membrane to rupture, the electrolyte will spray out, and combustion will occur.
We know what caused the fire of lithium batteries, and we know that lithium battery fires are challenging to control. Therefore, once you find signs of smoking, fire, etc., in the use of electric vehicles, you must take time to escape, and you must not lose too much! To learn more about lithium batteries, please follow HOPPT BATTERY.
HOPPT BATTERY focuses on the global smart manufacturing industry and provides efficient, safe, and reliable power solutions to its products, helping develop the global smart industry.