The tacit understanding between the two new energy automobile giants has naturally triggered a revaluation of lithium ferrous phosphate technology in the industry, and the development of power batteries has undergone earth-shaking changes. At present, users of new energy vehicles believe that they are very familiar with ternary lithium batteries, which are the most mainstream power batteries in the market at present, and their biggest advantage is the long battery life brought by high energy density. As the saying goes, "You can't have your cake and eat it". Although ternary lithium battery can achieve long battery life, its safety is its achilles heel. The runaway temperature of ternary lithium battery is only 300 degrees, which puts forward very strict requirements for the temperature control management of battery components. Most of the spontaneous combustion incidents of 20 19 electric vehicles are related to ternary lithium batteries, and the safety problem has attracted more and more public attention, which can not be ignored by manufacturers and consumers.
Consumers have been anxious about mileage for a long time. Ternary lithium battery does solve the "pain point" in the market, but if safety is sacrificed, consumers will inevitably have hidden concerns. Under such circumstances, lithium iron phosphate batteries naturally become the focus of the market again. After all, compared with ternary lithium batteries, lithium iron phosphate batteries have much higher safety performance. Before the popularization of ternary lithium batteries, the power batteries of new energy vehicles in China mainly relied on lithium ferrous phosphate technology. After the defeat of the "Battle of Endurance", lithium ferrous phosphate gradually faded out of public view. It is true that the battery density in lithium ferrous phosphate is lower than that in ternary lithium, but its stability is much higher than that in ternary lithium. The key is that the P-O bond in LiFePO4 crystal is stable and not easy to decompose. Even in the case of high temperature or overcharge, the structure will not collapse, heat or form strong oxidizing substances, and its decomposition temperature is about 600℃. In addition, lithium iron phosphate battery has many advantages, such as long service life, large charge-discharge rate, good safety, good high temperature resistance, harmless elements and low cost.
At present, what needs to be solved most is how to improve and break through the endurance. It is this "short board" that makes it gradually "out of favor" in the market game. Perhaps the advent of BYD's blade battery technology can rejuvenate lithium ferrous phosphate. As we all know, BYD started by producing batteries, and then officially entered the passenger car market through the acquisition of Qinchuan Automobile. In the initial stage of developing and producing new energy vehicles, enterprises always adhere to the route of lithium ferrous phosphate. It can be said that BYD can definitely be called the leader of lithium iron phosphate battery with its superior R&D capability and technical reserve. For electric buses and commercial vehicles with poor comprehensive working conditions, it always adopts the technical route of lithium iron phosphate power.
With the continuous accumulation and iteration of BYD's technology, BYD's blade battery has ushered in a "flowering and fruiting" moment in the critical year when the time is approaching 2020. According to the data, the blade battery is BYD's new generation lithium iron phosphate battery. Because it is different from the traditional power battery cells, the arrangement of the cells is inserted into the battery pack in a "blade" way, so it is named "blade battery". Compared with the traditional battery, the volume ratio and energy density ratio of the blade battery are increased by 50%, and the energy density can reach 180Wh/kg, which is not inferior to the ternary lithium battery of NCM8 1 1. Blade battery not only has the core advantages of high safety and long life. In terms of battery life, blade batteries also have incomparable advantages over ternary lithium batteries, and the number of battery cycles has been greatly improved. The service life of the blade battery exceeds 1 10,000 km, which improves the practicability of the whole vehicle geometrically.
Written at the end: The arrival of BYD blade battery is definitely a great change of power battery. In addition to accelerating the pace of car electrification, lithium iron phosphate battery technology will once again win the attention and recognition of the market. New energy vehicles are about to enter the next wave of technological upgrading. After experiencing a 20 19 recession, the market is likely to be the "spring" of the industry.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.