Analysis of basic knowledge of new energy vehicle power lithium-ion battery

Analysis of the basic knowledge of new energy vehicle power lithium-ion batteries When it comes to purchasing electric vehicles, most consumers may first think of preferential, unlimited, and unlimited policies. But assuming that you really want to buy an electric car, and you want to drive comfortably, you know that preferential policies are far from enough. The battery of electric vehicles, as the core component, has always been regarded as an important milestone in the opening of electric vehicle technology, and the bottleneck of electric vehicles driving, its function directly determines the length of the driving journey of electric vehicles. This kind of spontaneous combustion of electric vehicles also worries customers. Therefore, before buying an electric car, you must know its heart. Since there are many types of batteries for electric vehicles, a large part of them have been screened by the market, so we first roughly know the basic characteristics of these batteries through a table, and then explain the common types of batteries on the market. Lead-acid batteries are currently widely used batteries. Its important advantages are stable voltage and low price; the disadvantages are low specific energy (ie, stored energy per kilogram of battery), short life span and daily protection. The life of an old battery is generally about two years, and it is necessary to regularly check the height of the electrolyte and add distilled water, but with the development of technology, lead-acid batteries have a longer life and less protection. Lead-acid batteries are also large because of their low energy density. In addition, since its composition is sulfuric acid electrolyte, it will seriously pollute the environment after being discarded. But its biggest shortcoming is that the talent to continue driving is low, so it is not suitable for pure electric vehicles to meet people's daily needs. From now on, lead-acid batteries are mainly used in low-speed electric vehicles, especially on old-fashioned motorcycles and electric bicycles. Lithium iron phosphate battery is a kind of lithium battery. Its characteristic is that it does not contain noble metal elements such as cobalt. The materials used are phosphorus and iron. These elements are not only rich in resources, but also relatively inexpensive. The safety of lithium iron phosphate batteries ranks first among lithium batteries. It begins to differentiate before 700°C to 800°C, but unlike ternary lithium data, it does not undergo violent chemical reactions and does not release oxygen molecules. Optimal security. Because of this, it has become one of the important categories of electric vehicle batteries. In addition, high charging and discharging efficiency and no pollution to the environment are its advantages. However, it also has its own shortcomings, because the low energy density of the battery makes it relatively large; the small battery capacity reduces the ability to continue driving; after it is scrapped, the recyclable value is very low; and, due to its poor low-temperature function, Studies have shown that the battery has a capacity of 3500 mAh. If it is operated at -10°C, after less than 100 charge and discharge cycles, the power will be greatly reduced to 500 mAh, and the bottom will be scrapped. Tesla MODELS uses a ternary lithium battery with a higher energy density than a lithium iron phosphate battery, which means that a ternary lithium battery of the same weight has a longer life than a lithium iron phosphate battery. However, when the temperature of the ternary lithium battery itself is 250-350°C, its internal chemical composition will undergo preliminary differentiation, which puts forward higher requirements on the battery production system, and the cost of the battery is relatively high. In short, ternary lithium data is simpler than lithium iron phosphate data. However, in recent years, car companies have paid more and more attention to consumer demand for additional travel. They use specific technologies and design methods to prevent their shortcomings. Japanese manufacturers choose lithium manganese oxide batteries because their induction function is relatively balanced, and the technology is not as fast as ternary lithium batteries, because the precious metal cobalt is not used, so the cost is much lower, and there is no patent limit. This sounds like the Japanese economy The electric continuation of the application strategy. Lithium manganate is a low-capital, safe, and good low-temperature anode material, but the information itself is unsafe. The short-term differentiated gas, mixed with other materials, reduces the battery's capital, but its cycle transient decays faster. Short-term expansion, poor high temperature effect, relatively short position, the first to be used in large and medium-sized batteries, power lithium-ion batteries with a rated voltage of 3.7V. Although its energy density is not as good as that of a ternary lithium battery, statement: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Preparation technology of ternary positive electrode powder and its influence on the structure