A new battery preparation technology recently passed the China High-tech Industrialization Research Association and China Machinery Industry Federation organized scientific and technological achievements evaluation and product identification. It is reported that the new technology called "square flexible packaging 5 Ah lithium vanadium phosphate / graphite lithium-ion battery" is jointly completed by Tianjin University, Harbin Far-New Energy Vehicle Power Battery Co., Ltd. and Heilongjiang Yuanfang New Energy Technology Development Co., Ltd., Experts believe that this technology has reached the leading domestic and international advanced level in battery low temperature performance and other aspects, will greatly improve the energy level of the new energy pure electric vehicle mileage, low temperature driving, safety and so on. Tang Zhiyuan, a professor at Tianjin University, said lithium-ion batteries using lithium vanadium phosphate as the cathode material have the advantages of high capacity, good safety, long service life and excellent low-temperature performance compared with conventional batteries. Currently, the cathode material used in the battery market is more lithium cobalt oxide, lithium manganese oxide, ternary materials and lithium iron phosphate. These batteries have their own characteristics, but a common disadvantage is that there are potential safety hazards, electric vehicles, battery explosion or combustion have occurred from time to time, and lithium-ion batteries in the field of electric vehicles to be widely used, safety is a must First solve the problem. Not long ago, the lithium vanadium phosphate battery passed the acupuncture safety test of the Quality Supervision and Inspection Center of Chemical Physics Power Products of the Ministry of Industry and Information Technology. The battery did not explode and burn in the acupuncture process. The battery remained intact after acupuncture experiment and showed excellent Security. Tang Zhiyuan said that the acupuncture experiment is a large needle directly into the battery when the battery working state, causing artificial short-circuit, the simulation is that new energy vehicles suddenly received a strong crash in extreme conditions, the battery received serious Damaged state, belonging to the most extreme state of battery damage. In this state, many of the batteries currently in use will burn or explode due to rapid thermal energy generation. However, lithium vanadium phosphate batteries only emit light white fumes when they are vaporized by heating, and there is no safety problem. In terms of capacity, compared with the commonly used car battery, the unit weight of lithium vanadium phosphate battery capacity is about 26% higher, the future will hopefully increased to 40% to 60%.
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