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1、 Better low-temperature discharge performance

China has a vast territory and a complex climate. From the three northeastern provinces at the northernmost to the Hainan Islands at the southernmost, the temperature changes are very rich. Take Beijing as an example. As the main market of electric vehicles, the highest temperature in Beijing is about 40 ℃ in summer, while in winter, it basically remains about minus 16 ℃, or even lower. This temperature range is obviously suitable for ternary lithium ion batteries with better low-temperature performance. However, lithium iron phosphate battery, which pays attention to high temperature resistance, will be weak in winter in Beijing.

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Relative 25 ℃ capacity refers to the ratio of discharge capacity at different temperatures to discharge capacity at 25 ℃. This value can accurately reflect the attenuation of battery life at different temperatures. The closer to 100%, the better the battery performance.

It can be seen from the above figure that the discharge capacity of the two types of batteries at 55 ℃ and 25 ℃ is almost the same at 25 ℃. But at minus 20 ℃, ternary lithium ion battery has obvious advantages compared with lithium iron phosphate battery.

2、 Higher energy density

According to the data provided by Bike Battery, the leading company of 18,650 cylindrical battery made of ternary materials in China, the energy density of its 18,650 battery has reached 232Wh/kg, which will be further increased to 293Wh/kg in the future. In contrast, the energy density of the mainstream lithium iron phosphate battery in China is only about 150Wh/kg. According to the analysis of domestic battery industry experts, there is little hope that the energy density of lithium iron phosphate battery can reach 300Wh/kg in the next few years.

Ternary lithium ion battery, lithium iron phosphate battery, power lithium battery

Unlike the huge electric bus, space is always the first place for the household electric vehicle. The lithium iron phosphate battery with low energy density will occupy the originally small car space, and due to its heavier weight, its discharge duration in use will also be greatly affected. Relatively speaking, the ternary lithium ion battery with high energy density not only solves the weight problem, but also saves space for family cars.