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Does the Tesla 4680 battery is LiFePO4? Overview of the advantages and disadvantages of the 4680 batteries

February 18, 2023

A Tesla 4680 battery is a battery with a diameter of 46 mm and a height of 80 mm, named after its size. The shape is cylindrical, which is different from the mainstream square battery. Tesla 4680 battery is currently using the three-yuan lithium battery technology route, do not rule out the subsequent launch of LiFePO4 battery.

4680 belongs to ternary high nickel battery, cathode material is NCA (nickel cobalt aluminum), high nickel battery of three metals common ratio is 8:1.5:0.5. Nickel cobalt aluminum is three kinds of metal elements, so it is called “ternary lithium”, ternary lithium is generally divided into NCA and NCM (nickel cobalt manganese).

4680 battery is also different from the mainstream battery in cathode materials, the mainstream is mainly graphite, 4680 battery uses silicon-based anode, the material characteristics are higher than capacity, but there are problems such as easy volume expansion, poor electrical conductivity, large first charge and discharge loss. To find a balance between the energy density and the stability, the current practice is to mix silicon and graphite.

4680 Battery in the process, the positive and negative electrode added PVDF coating, using more aluminum foil and copper foil to protect the electrode material, the conductivity is more sensitive. And the infinite ear design, the original positive and negative electrode connection of the glue is reduced, reduce cost and increase efficiency, welding using laser technology.

Advantages and disadvantages of the 4680 batteries

1.5.4 times larger than the previous 2170 cylindrical battery, the battery capacity is increased by 5 times, the vehicle range is increased by 16%, the infinite ear design, the charging and discharge speed is increased by 6 times, is expected to reduce the internal resistance of the battery to the original fifth, the heat production is lower and safer;

2.4680 is used with CTC scheme, that is, the battery cell is directly integrated into the chassis to improve the energy density of the battery system, reduce the weight of the vehicle, improve the production efficiency, and have more space for optimization in the ride;

3. The disadvantage is that it is impossible to determine whether there will be the difficulty of heat dissipation inside the battery, the expansion of the cell, and the shortening of battery life.

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