A few days ago, a new battery preparation skills called square soft packaging 5Ah vanadium phosphate lithium/graphite lithium ion battery recently through China's high science and technology (technology industrialization research association and China's machinery industry federation organization of scientific and technological achievements evaluation and product identification. This skill was jointly completed by Tianjin University, Harbin Yuanfang New Energy Car Power Lithium Battery Co., Ltd. and Heilongjiang Yuanfang New Energy Technology Development Co., Ltd.
Now, the battery market used more positive electrode data are lithium cobalt acid, lithium manganese acid, ternary data and lithium iron phosphate, etc. These batteries have their own characteristics, but a common flaw is that there are hidden safety risks. The phenomenon of electric car battery blasting or burning happens from time to time. If lithium ion batteries want to be widely used in the field of electric cars, the safety problem must be solved first.
Not long ago, this kind of vanadium phosphate lithium ion battery passed the needling safety test of chemical physics power supply product quality supervision and inspection center of the Ministry of Industry and Information Technology. In the process of needling the battery, there was no blasting and burning. After the needling experiment, the battery insisted on intact, showing excellent safety.
Professor Tang Zhiyuan of Tianjin University said that compared with conventional batteries, lithium ion batteries with lithium vanadium phosphate as positive electrode data have high capacity, good safety, long service life and excellent low temperature function and other characteristics.
Tang Zhiyuan said that the needling experiment is to use a large steel needle to directly stab the battery in the working condition, causing artificial instantaneous short circuit, which mimics the new energy cars in extreme conditions suddenly received a violent collision, battery severe damage when the situation, belongs to the most extreme battery damage. In this situation, many batteries in use now will be burned or exploded because of the rapid attack of heat, but vanadium phosphate lithium ion battery is only the electrolyte heated after vaporization and release a fine white smoke, there will be no safety problems.
In terms of capacity, the capacity of vanadium phosphate lithium-ion battery per unit component is about 26% higher than that of commonly used vehicle batteries, and it is expected to increase to about 40% to 60% in the future.
In addition, vanadium phosphate lithium ion battery also has an outstanding feature, is the low temperature function is very excellent. At present, the severe attenuation of battery in low temperature environment is a big problem encountered by new energy cars, especially pure electric cars. A typical example is that many pure electric cars marked with a range of about 200 kilometers may only have an actual range of more than 100 kilometers after being fully charged in the cold winter in the north, with severe battery attenuation. Vanadium phosphate lithium ion battery is different, according to the national standard, in the minus 20 degrees Celsius environmental conditions, car batteries can release 70% of the power, that is qualified.
It is understood that the battery by the Ministry of Industry and Information Technology chemical and physical power supply product quality supervision and inspection center detection, in minus 30 degrees Celsius environmental conditions, can release 81% of the charge.
At present, similar products can only release 30 to 40 percent of their charge at temperatures of minus 30 degrees Celsius, Mr. Tang said. In addition, the high temperature discharge function of this battery is also very good. According to the detection, it can release 93% charge under the environmental conditions of 0.55 degrees Celsius, which greatly reduces the impact of temperature changes on the range of electric vehicles and other aspects.
The expert committee believes that the results of this technique significantly improve the thermal stability, safety and cycle life of the battery, especially in improving the low temperature discharge function of the battery has made outstanding progress, reaching the first domestic and international advanced level.
