What are the reasons for lithium ion batteries burn or explosion?

Source: 2020 - 04 - 10 and clicks: lithium ion battery there are three reasons for the combustion or explosion with its than lithium ion secondary battery can be high, high working voltage, the advantages of small volume, light weight as mobile communications, laptop computers and other portable electronic products one of the main sources of power. However, lithium-ion batteries in charging and discharging process may explosion because of improper use. Especially in the case of abuse ( Such as heat, overcharge, short-circuit, vibration, extrusion, etc. ) , the battery will be burning, explosion and even damage. Therefore, research the explosion mechanism of lithium-ion batteries is of great significance to enhance the security of a lithium ion battery. See more pictures of battery explosion, looking for industry to analyze the lithium ion battery cell network three possibilities of the combustion or explosion, mainly has the following three. A, when heated, when lithium ion battery battery internal reaction is like a chain reaction, promote each other, each reaction. First of all, SEI decomposition heat to heat the battery, causes between the negative electrode reaction and the solvent release more heat and cause negative electrode and adhesive, the reaction between the solvent separation, followed by the positive start pyrolysis reaction, release a lot of heat and gas, resulting in the battery the combustion or explosion. 2. During the initial rechargeable lithium ion batteries, when the current through the battery, part of the electrical energy into heat energy, ohm polarization also produce part quantity of heat, but the battery surface temperature rise slowly. Is achieved when the battery charging status, continuous lithium ions embedded into negative surface deposition of metallic lithium reaction, and the heat released by the oxidation reaction of overcharging solvent is much higher than the heat released by the reaction of lithium ion and solvent under reversible state. Rise in the temperature of the battery and lithium metal reaction with the solvent, the intercalated-li carbon reaction with the solvent one by one, the heat out of control. Three, short circuit, acupuncture and impact damage in lithium ion batteries are roughly the same. In the case of short circuit, the current through the battery would produce a lot of heat, make the battery heating, the temperature of the battery temperature rise to the anode decomposition. When the needle is very fast, in acupuncture parts cause local short circuit, produce a lot of heat, make the battery internal temperature to the anode thermal decomposition temperature. When lithium-ion batteries, electrode voltage loss of surplus heat, promote the reaction between solvent and negative electrode, and heat release further heating batteries, it promotes the thermal decomposition reaction of the anode, leading to loss of heat.