What are the possibilities of burning lithium batteries?

There are three possibilities for burning or exploding lithium batteries, of which the following three are important. 1. When the lithium battery is heated, the reactions inside the battery are like a reaction chain, and each reaction promotes each other and proceeds in sequence. The first is that the SEI film releases heat to heat the battery, which promotes the reaction between the negative electrode and the solvent to release more heat, leading to the reaction between the negative electrode and the binder and solvent decomposition, and then the positive electrode begins to undergo thermal decomposition reaction, releasing a large amount of heat and gas. , And finally cause the battery to burn or explode. 2. In the initial stage of lithium battery charging, part of the electrical energy is converted into heat when the current passes through the battery, and part of the heat also appears in ohmic polarization, but the surface temperature of the battery rises very slowly; when the battery reaches a fully charged state, the lithium ion continues the intercalation reaction It becomes the deposition of lithium metal on the surface of the negative electrode, and the solvent is oxidized (the heat released by the oxidation reaction of the solvent caused by overcharge is much higher than the heat released by the reaction between lithium ions and the solvent in the reversible state), and the heat released heats the battery; As the temperature of the battery rises, the reaction between metallic lithium and the solvent, and the reaction between the lithium-intercalation carbon and the solvent occur successively, and the heat is out of control, accompanied by the decomposition of the solvent and the reaction between the binder and the lithium metal. 3. The harm caused by short circuit, needle stick and impact to lithium battery is roughly the same. When a short circuit occurs, a large amount of heat occurs when the current passes through the battery, heating the battery, and the temperature of the battery rises to the temperature at which the positive electrode decomposes. The thermal decomposition of the positive electrode causes the heat of the battery to run out of control; when the acupuncture speed is very fast, it will cause local A short circuit and a large amount of heat will cause the internal temperature of the battery to rise to the temperature of thermal decomposition of the positive electrode; when the lithium battery is impacted, the overvoltage loss on the electrode will cause heat to promote the reaction between the solvent and the negative electrode, and the heat released will further heat the battery. Promote the thermal decomposition reaction of the positive electrode to occur, resulting in the loss of heat control. 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 post: What are the tips for using Ni-MH rechargeable batteries?