Three main reasons for combustion and explosion in lithium batteries

　　Author ：Iflowpower – Portable Power Station Supplier

The battery combustion and explosion of the lithium ion battery have the following three points: 1. When the lithium ion battery is hot, the reaction inside the battery is such as a reaction chain, and each reaction is mutually promoted. First, the SEI film analysis released heat heated the battery, which causes the reaction to the negative electrode and the solvent to release more heat, resulting in the reaction of the negative electrode and the binder, solvent analysis, and the positive electrode begins to perform a thermal analysis reaction, and release a large amount of heat and gas Finally, the battery is burned or exploded.

Second, in the initial stage of lithium ion battery, the current is converted to heat energy when the battery is passed through the battery. The ohmic polarization also has part of the heat, but the surface temperature of the battery has risen very slowly; when the battery reaches the full state, it is continuously embedded by lithium ions. The reaction becomes the deposition of the lithium metal on the surface of the negative electrode, and the solvent is oxidized (the amount of heat generated by the oxidation reaction caused by the overcharge is much higher than the heat released by the heat of the lithium ion and the solvent reaction in the reversible state).

The battery is heated; As the battery temperature increases, the metal lithium is reactive with the solvent, and the apholithium carbon and the solvent reaction occurs, and the heat is out of control, and the reaction of the solvent is accompanied by the analysis of the solvent, the reaction reaction of the binder and lithium metal. Third, short circuit, acupuncture and hit the harm caused by lithium-ion batteries. When the current is short, the current has a large amount of heat, heating the battery, so that the battery temperature is raised to the temperature of the positive electrode analysis, and the positive electrode heat analysis causes the battery heat to be out of control; when the acupuncture speed is very fast, there is a part in the acupuncture The short circuit and a large amount of heat, the internal temperature of the battery is raised to the temperature of the positive electrode heat analysis; when the lithium ion battery is hit, heat is heat, which causes the solvent to react to the negative electrode, and further heat the battery.

, Prompting a positive thermal analysis reaction, resulting in failure of heat. .