Power battery practitioners must understand lithium battery safety test standards

After the lithium-ion battery is produced, it needs to go through a series of tests before it reaches the consumer to ensure the safety of the battery and reduce potential safety hazards. Power battery practitioners must understand the safety test standards for lithium batteries! 1. Squeeze test: Place the fully charged battery on a flat surface, apply a pressure of 13±1KN from the cylinder, and squeeze the battery with a flat steel rod with a diameter of 32mm. Once the squeeze pressure reaches the maximum, the battery will not catch fire or explode. 2. Impact test: After the battery is fully charged, a steel column with a diameter of 15.8mm is placed vertically in the center of the battery, and a weight of 9.1kg is freely dropped from a height of 610mm on the steel column above the battery. The battery will not catch fire or explode. 3. Overcharge test: When the battery is fully charged for 1 c, it should be overcharged according to 3 c and 10 v overcharge test. When the battery charging voltage rises to a certain voltage and stabilizes for a period of time, the battery voltage rises rapidly when it is close to a certain level. The top hat had the battery, the battery voltage dropped to 0V, there was no fire or explosion. 4. Short-circuit test: A complete battery will use a wire with a resistance of no more than 50 mΩ. The battery is a negative short-circuit, test the surface temperature of the battery, the maximum surface temperature of the battery is 140 ℃, the battery, the battery has no fire and no explosion. 5. Acupuncture test: Place a fully charged battery on a flat surface and pierce the battery with a steel needle with a diameter of 3mm in the radial direction. The test battery will not catch fire or explode. 6. Temperature cycle test: The temperature cycle test of lithium-ion batteries simulates the safety of lithium-ion batteries repeatedly exposed to low and high temperature environments during transportation or storage. The test is carried out using rapid and extreme temperature changes. No fire, explosion or leakage should be observed after the test. Power battery practitioners must understand the safety test standards for lithium batteries! How to make lithium batteries safer In view of the many safety hazards in the materials, manufacturing and use of lithium-ion batteries, how to improve the parts that are prone to safety problems is a problem that lithium-ion battery manufacturers need to solve. 1) There is a high reactivity between the 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 new lithium salts and using new solvents, the safety hazards of electrolytes can be effectively solved. 2) According to the different effects of additives, they can be divided into the following categories: safety protection additives, film forming additives, positive protection additives, stabilizing lithium salt additives, lithium precipitation promotion additives, fluid anticorrosion additives, and wettability enhancement additives. 3) In order to improve the performance of commercial lithium salts, researchers have carried out atom substitutions and obtained many derivatives. Among them, compounds obtained by replacing atoms with perfluoroalkyl groups have the advantages of high flash point, close electrical conductivity, and enhanced water resistance. Therefore, they are a kind of lithium salt compounds with good application prospects. In addition, the anionic lithium salt obtained by chelating the oxygen ligand with the boron atom as the central atom has high thermal stability. 4) For solvents, many researchers have proposed a series of new organic solvents, such as carboxylates, organic ethers and other organic solvents. In addition, ionic liquids also have a class of electrolytes with high safety, but compared with carbonate electrolytes commonly used, ionic liquids have a higher order of magnitude of viscosity, low conductivity and ion self-diffusion coefficient, so there is still a lot of work to be done in practice. Disclaimer: The articles published on this site are all from the Internet and do not represent the views of this site. If there is any infringement, please contact to delete WeChat: Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact delete A: The impact of overheating on lithium batteries and the ARC safety assessment method for lithium batteries