What is the thermal runaway process of lithium-ion batteries?

1. The internal thermal runaway link of the rechargeable battery is caused by internal short-circuit failure, external heating, or the rechargeable battery itself becomes hot when the high-current battery is charged, causing the internal temperature of the rechargeable battery to rise to around 90℃～100℃, lithium ion salt LiPF6 has just begun to dissolve; the specificity of carbon-negative organic chemistry for battery charging is very high. It is close to the metal lithium ion and dissolves in the SEI film on the lower surface of the high temperature. The lithium ion battery and lithium ion battery electrolyte of high purity graphite are placed in it. The binder will react, further pushing the battery temperature to 150°C, at which a new strong chemical reaction will appear. 2. Battery bulge link: When the temperature of lithium ion battery reaches 200℃ or higher, the positive electrode material of the battery will dissolve, releasing a lot of heat and vapor, and increasing the temperature continuously. The negative stage of the lithium-ion intercalation state at 250-350°C has just begun to react with the electrolyte of the lithium-ion battery. 3. Battery thermal runaway and ineffective link: During the whole process of reaction, the positive electrode material of the battery in the charged state has just begun to have a strong chemical reaction, and the lithium ion battery electrolyte has a strong oxidation-reduction reaction, which releases a lot of heat, resulting in high temperature and Many vapors and lithium-ion batteries ignite. Is the thermal runaway reaction of different lithium-ion batteries the same? When the outside is heated, all lithium-ion batteries cause heat to be uncontrollable and release dense smoke and vapor. For about half of the working lithium-ion batteries, within 15 seconds after the heat cannot be controlled, the vapor accumulated in the drying box is ignited to form vapor, and the key smoke is released during the whole process. Regardless of whether or not the lithium-ion batteries used in the previous circulatory system, they did not harm the appearance of vapor. They appeared in the embrittlement level of all circulatory systems of 0-300 deep circulatory systems. Compared with other types of rechargeable batteries, lithium-ion batteries are very hot and have a higher risk of fire due to their vapor emissions. This risk is far from being fully known, and it is possible to improve the safety factor of system software based on scientific research and analysis of safety incidents. The type of risk and the more serious level lie in the different applications and the size of the rechargeable battery system software. Because of the spreadability of common faults of rechargeable batteries and control modules, with the improvement of the software specifications of the rechargeable battery system, the adverse effects of common faults will be significantly increased. Lithium cobalt oxide battery heat cannot control the maximum temperature, reaching 850 degrees Celsius; nickel cobalt manganese ternary lithium ion battery is second, reaching 670 degrees Celsius; lithium iron phosphate battery rechargeable battery has no significant heat uncontrollable heat, the highest temperature is about 400 degrees Celsius . The driving force for the inability of heat to control the whole process is obviously the kinetic energy of the lithium-ion battery. The energy density of the lithium cobalt oxide battery is the highest, and the temperature transition and vapor discharge are also the strongest. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: What are our choices for next-generation batteries?