Introduction to the safety of lithium iron phosphate batteries

According to lithium battery manufacturers, the PO bonds in lithium iron phosphate crystals are stable and difficult to analyze. Even at high temperatures or overcharge, they will not collapse and generate heat or form strong oxidizing substances in the same structure as lithium cobalt oxide. safety. The lithium iron phosphate battery has undergone strict safety detection and will not explode even in a traffic accident. The safety of the battery in the final analysis reflects the temperature problem. The ultimate result of any safety problem is that the temperature rises until it is out of control, until a safety accident occurs. The safety test of the battery usually includes overcharge, overdischarge, puncture, squeeze, drop, heating, short circuit, etc. Under these conditions, the temperature of the battery will rise or the temperature of some areas will be too high, reaching a certain minimum temperature value. The occurrence of a large amount of heat cannot be dissipated in time to cause a series of exothermic side reactions, resulting in thermal runaway. Under normal circumstances, the more energy concentrated in the unit space of a single cell, the greater the hazard and the lower the safety. Therefore, the safety of lithium iron phosphate batteries with lower energy density is slightly higher than that of ternary lithium batteries. According to media reports, BYD will launch a new generation of lithium iron phosphate batteries next year. According to analysis, the volume/energy density of the new lithium iron phosphate battery is increased by 50%. With higher safety, longer life (1.2 million kilometers in 8 years) and lower cost (cost savings can be 30%). Generally speaking, battery safety is inversely proportional to the energy stored in the battery, that is, the greater the energy that can be released, the greater the safety risk. Lithium iron phosphate materials will not release heat until 250 degrees Celsius or more. Therefore, lithium iron phosphate batteries are used in commercial vehicles, especially urban buses and buses. This is a correct choice for the development of domestic electric vehicles. The safety of people's lives and property is more guaranteed. Lithium iron phosphate batteries are usually installed in special battery rooms in substations, and the environment is good, and there will be no overheating, vibration, squeezing, or short-circuiting of the battery. Therefore, the key to its safety is that it cannot be overcharged or overdischarged . Compared with lead-acid batteries, lithium iron phosphate batteries have a higher rated voltage and can reduce the number of batteries in series with the same capacity; it has better temperature characteristics and lower environmental temperature requirements. With lithium iron phosphate batteries With further improvement in performance and further decline in price, lithium iron phosphate batteries are regarded as an ideal substitute for lead-acid batteries. Lithium iron phosphate batteries are being used more and more widely due to their high safety, especially when used in combination as power lithium batteries, there is huge room for development. 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 post: Analysis of the advantages and disadvantages of lithium-ion power lithium-ion batteries