How are the safety features of lithium batteries realized?

How are the safety features of lithium batteries realized? In order to ensure the safe and reliable use of lithium batteries, experts have carried out very strict and thorough battery safety design to achieve battery safety assessment indicators. (1) The diaphragm 135℃ automatic shut-off protection adopts the international advanced Celgard2300pE-pp-pE three-layer composite membrane. When the temperature of the battery reaches 120℃, the pores of the pE membrane on both sides of the composite membrane are closed, the internal resistance of the battery increases, and the temperature rises inside the battery slows down. When the temperature of the battery reaches 135℃, the pp membrane pores are closed, the internal circuit of the battery is open, and the battery is no longer Heat up to ensure battery safety and reliability. (2) Adding additives to the electro-liquid. When the battery is overcharged and the battery voltage is higher than 4.2v, the electro-hydraulic additives polymerize with other substances in the electro-liquid, the internal resistance of the battery is greatly increased, and a large-area open circuit is formed inside the battery. The battery no longer heats up. (3) Battery cover composite structure. The battery cover adopts a scored explosion-proof structure. When the battery heats up, part of the gas that occurs during the internal activation of the battery expands, the internal pressure of the battery increases, and the pressure reaches a certain degree of score cracking and deflation. (4) Various environmental abuse tests Conduct various abuse tests, such as external short circuit, overcharge, acupuncture, plate impact, incineration, etc., to investigate the safety performance of the battery. At the same time, the battery is subjected to temperature shock tests and mechanical performance tests such as vibration, drop, and shock to investigate the performance of the battery in the actual use environment. 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 fuel power batteries? What are its shortcomings?