Why do you say the lithium iron phosphate battery is the safest?

Source: 2020 - 04 - 04 13:01 hits: lithium iron phosphate is one of the safest battery as of October 2015, China has more than 20000 electric buses installed the CATL power battery, all zero accident is realized. As the battery supplier, battery safety has been the focus of attention of CATL especially in the new energy vehicles, if ignore the power battery safety problems, may endanger the whole new energy bus industry. As the core parts of the new energy bus customer about the application of power battery have what specific requirements? Jian-guo hu analysis indicates that, at least include security, reliability and durability of three aspects. On security issues, jian-guo hu said, at present the mature of the lithium iron phosphate battery technology has been able to minimize the possibility of a battery fire. In terms of reliability, the CATL power battery also ensures less breakdown and higher attendance; In terms of durability, CATL is committed to the power battery life cycle and the life cycle of the vehicle. Lithium iron phosphate battery power battery how important for the safety of the city bus? Chaoyang district, said hu city bus features include adults more than less, regardless of any operation, the bad weather in the city, and any public security incidents, according to characteristics of urban public transportation, people have become very not easy escape after the accident, so use with power battery bus more should pay attention to the safety of the power battery. From the point of view of the product, how CATL power battery is safe? Jian-guo hu first pointed out that the safety of the battery system should know from two aspects: one is the whole process. From the quantum dynamics simulation analysis of battery, mechanism analysis, the choice of battery materials and design, the design of the battery, battery system design and the manufacturing process must be under the control of the security. Second, comprehensive, battery system security including electrical safety, functional safety, mechanical safety, chemical safety. As for the battery system chemical safety, he thinks the most important thing is the safety of the battery. The safety of the battery needs from the battery raw materials selection, design and manufacturing process of considering how to reduce heat loss probability. CATL, he says, are not recommended for passenger cars, although the CATL already mass production, using 3 yuan in passenger car batteries, battery energy density has reached 180 watt-hours per kilogram. One is the safety of the lithium iron phosphate battery maturity is higher than three yuan, Low thermal loss probability) , the second is the energy density of the lithium iron phosphate battery system can meet the needs of passenger cars. Due to the volume of passenger car and space are clean, in the design of battery system, the group efficiency is very high, up to 78%. Therefore, for the bus users, not only to look at the energy density of battery, also look at the energy density of battery system installed in the car. CATL lithium iron phosphate battery current energy density is 100 watts per kilogram, which means that the power of a ton of battery can withstand 100 degrees. CATL always hopes to more mature, more security products assembled into passenger cars, and this is CATL responsibility. To ensure the safety of the electrical machinery safety and electrical connections, when the battery group CATL will choose mature welding technology, instead of the traditional screw connection, make sure that in the long run, in the case of mechanical shock and thermal shock, can guarantee the stability of the mechanical structure and battery system connection, there will be no such problems as loose light mechanical and electrical connections. In the design of battery system, CATL simulation first, and then test evaluation. From micro to macro simulation content, including quantum dynamics, mechanical structure topology optimization, shape optimization and size optimization, thermal analysis and thermal loss control, thermal field distribution, modal and vibration fatigue, shock, rocks, etc. To understand every step of the process, rather than through trial and error to design the product. At each stage after the sample come out, but also in accordance with the standard to do comprehensive test validation.