What methods can improve the safety of lithium battery packs?

How to improve the safety of lithium battery packs? There are various factors that cause thermal runaway of lithium batteries. To sum up, the most important ones are thermal runaway caused by overheating, overcharging, internal short circuit, and collision. How to improve the safety of lithium battery packs and minimize the risk of thermal runaway has become the top priority of people's research. Regarding a single battery, its safety is not only related to the positive electrode material, but also has a lot to do with other battery pack components such as the negative electrode, separator, electrolyte, and binder. The following describes how researchers reduce the risk of battery thermal runaway on battery materials and improve the safety of lithium battery packs. 1. Positive electrode material For safety reasons, the positive electrode material should have good compatibility and stability with the electrolyte. In the case of overcharge, the decomposition reaction of the positive electrode and its reaction with the electrolyte release a lot of heat, causing an explosion. The thermal stability of lithium cobalt oxide and lithium nickel oxide is relatively poor. Because of its high specific capacity and high specific energy density, the lithium nickel cobalt manganese oxide ternary material has become an ideal choice for the current cathode material. 2. Anode material The thermal stability of the anode material is related to the type of anode material, the size of the material particles, and the stability of the SEI film formed by the anode. If the small and large particles are made into a negative electrode according to a certain ratio, the purpose of expanding the contact area between the particles, reducing the electrode impedance, increasing the electrode capacity, and reducing the possibility of the precipitation of active metal lithium can be achieved. The quality of SEI film formation directly affects the charging and discharging performance and safety of lithium battery packs, weakly oxidizing the surface of carbon materials, or carbon materials that have been reduced, doped, or surface modified, and the use of spherical or fibrous carbon materials helps The quality of SEI film is improved. The important method to solve the safety of carbon anode materials is to reduce the specific surface area of u200bu200bthe anode material and improve the thermal stability of the SEI film. 3. Diaphragm lithium battery people have recently successfully developed a new type of hydroxyapatite ultra-long nanowire-based high temperature resistant lithium battery diaphragm. The battery diaphragm has high flexibility, good mechanical strength, high porosity, and electrolyte wetting. In addition to the characteristics of excellent adsorption performance, more importantly, it has high thermal stability, high temperature resistance, flame retardancy and fire resistance, and its structural integrity can be maintained at a high temperature of 700 ℃. 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: What are the advantages of rack UPS?