What is the basic cause of the fire in the lithium-ion battery pack?

Battery overheating: Overheating of the battery will cause thermal runaway. This overheating is most likely to occur during the charging and discharging process of the battery. Because the lithium-ion battery itself has a certain internal resistance, it will present certain heat while outputting electric energy to supply power for pure electric power, making its own temperature higher. When its own temperature exceeds its normal operating temperature range, it will damage the entire battery. Longevity and serenity. External force attack: Under the use of external force, lithium-ion battery cells and battery packs are deformed, and their different parts are relatively displaced, causing the battery partition to be torn and internal short-circuiting, and flammable electrolyte leakage eventually leads to fire. Among the effects of external attacks, puncture damage is the most serious. It may be directly inserted into the battery body, causing a direct short circuit of the positive and negative poles. Improper use of electricity: When an external short circuit occurs, the heat presented by the battery cannot be dissipated well, the temperature of the battery will also rise, and the high temperature will trigger the burning out of control. Too much discharge is the least harmful one of the improper behaviors of using lithium-ion battery packs, but the rise of lithium dendrites caused by over-discharge will reduce the safety of the battery and increase the possibility of thermal runaway. The most harmful one of the improper behaviors of using lithium-ion battery packs when charging too much. Due to excessive lithium insertion, lithium dendrites develop on the anode appearance. Secondly, the excessive deintercalation of lithium causes the cathode layout to collapse due to fever and oxygen release (oxygen release from the NCA cathode). The release of oxygen accelerates the resolution of the electrolyte and presents a large amount of gas. Due to the increase in internal pressure, the exhaust valve opens and the battery begins to exhaust. After the active material in the cell fights with the atmosphere, it will produce a violent echo and release a lot of heat, thereby igniting the burning of the lithium-ion battery. Out-of-control heat: The high temperature of the external environment may cause the battery heat to be too high when the temperature control system is not useful, causing the lithium-ion battery to short-circuit, thereby initiating burn out of control. In fact, the collision and damage of the lithium-ion battery, the internal layout of the battery, the function of the battery, the failure of other thermal management systems, and the air-conditioning system may all lead to an environment where heat is out of control. Lithium-ion battery packs are so dangerous, but there are many lithium-ion battery pack products in our lives, and there are only a few dangerous incidents that really appear. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Explanation of the difference between lithium-ion battery with shield and without shield