How to ensure the safety of lithium batteries

Generally speaking, the safety problems of lithium batteries are caused by burning or even explosion. The root cause of these problems is the thermal runaway inside the battery. In addition, some external factors, such as overcharge, fire, squeezing, puncture, short circuit, etc. Problems can also lead to security issues. Lithium batteries will generate heat during charging and discharging. If the heat generated exceeds the heat dissipation capacity of the battery, the lithium battery will overheat and the battery material will undergo SEI film analysis, electrolyte analysis, positive electrode analysis, negative electrode and electrolyte The reaction of the negative electrode and the reaction of the binder and other destructive side reactions. 1. There is a high reaction activity between the lithium battery electrolyte and the positive and negative electrodes, especially at high temperatures. In order to improve the safety of the battery, improving the safety of the electrolyte is one of the more effective methods. By adding functional additives, using a new type of lithium salt, and using a new type of solvent, the potential safety hazards of the electrolyte can be effectively dealt with. 2. Regarding the negative electrode material, since the surface of the lithium battery is often the most prone to thermochemical analysis and heat release, improving the thermal stability of the SEI film is a key way to improve the safety of the negative electrode material. 3. Setting up battery safety valves, thermal fuses, components with positive temperature coefficients in series, using thermal shutdown diaphragms, loading dedicated protection circuits, dedicated battery management systems, etc. are also means to enhance safety. 4. Lithium batteries will release heat during work, and will spontaneously ignite and explode before release. It can be managed by the battery thermal management system. The thermal management system of the new energy vehicle is a subsystem of the battery management system. The system can cool the battery when the temperature is too high, and when the temperature is low Preheating is performed to better exert the performance of the battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.