What are the characteristics of ternary lithium batteries?

1. Better low-temperature discharge performance. my country has a vast territory and a complex climate. The temperature changes from the three northeastern provinces at the northernmost point to the Hainan Islands at the southernmost point. Take Beijing as an example. As the main market for electric vehicles, the highest temperature in Beijing in summer is around 40°C, while in winter it is basically kept at minus 16°C or even lower. Such a temperature range is obviously suitable for ternary lithium batteries with better low-temperature performance. However, lithium iron phosphate batteries, which value high-temperature performance, will look a little weak in winter in Beijing. The relative 25℃ capacity refers to the ratio of the discharge capacity under different temperature conditions to the discharge capacity at 25℃. This value can accurately reflect the attenuation of battery life under different temperature conditions. The closer to 100%, the better the battery performance. It can be seen from the above figure that, taking 25°C as the reference room temperature, the two types of batteries are discharged at a high temperature of 55°C and discharged at a normal temperature of 25°C, and there is almost no difference in discharge capacity. But at minus 20°C, ternary lithium batteries have obvious advantages compared with lithium iron phosphate batteries. 2. Higher Energy Density According to the information supplied by BAK Battery, the leading domestic ternary material 18650 cylindrical battery company, the energy density of its 18650 battery has reached 232Wh/kg, and will be further increased to 293Wh/kg in the future. In contrast, the current domestic mainstream lithium iron phosphate battery has an energy density of only about 150Wh/kg. According to the analysis of domestic battery industry experts, the energy density of lithium iron phosphate batteries can reach 300Wh/kg in the next few years. Hope is very slim. Unlike the bulky electric buses, for household electric vehicles, space always comes first. Lithium iron phosphate batteries with lower energy density will occupy a small amount of car space, and due to the heavier mass, the discharge life during use will also be greatly affected. Relatively speaking, the ternary lithium battery with higher energy density not only solves the weight problem, but also saves space for family cars. Third, higher charging efficiency In addition to battery life, charging is also an important part of the actual use of electric vehicles, and the ternary lithium battery has a very big advantage over the lithium iron phosphate battery in terms of charging efficiency. The more common charging method currently on the market is constant current and constant voltage charging. Generally, constant current charging is used at the beginning of charging. At this time, the current is larger and the charging efficiency is relatively higher. After the voltage reaches a certain value, reduce the current and change to constant voltage charging, so that the battery can be charged more fully. In this process, the ratio of the constant current charging capacity to the total battery capacity is called the constant current ratio. It is a key value to measure the charging efficiency of a group of batteries during the charging process. Generally, the larger the percentage, the higher the amount of electricity charged in the constant current stage, which also proves that the battery has a higher charging efficiency. It can be seen from the table that when the ternary lithium battery and the lithium iron phosphate battery are charged below 10C, there is no significant difference in the constant current ratio. When the rate is above 10C, the constant current ratio of the lithium iron phosphate battery decreases rapidly, and the charging efficiency decreases rapidly. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: What factors affect the cycle performance of lithium batteries?