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18650 battery cells are one of the commonly used cells in mobile power supplies and laptop batteries. The common form is a cylindrical cell with a diameter of 18mm and a length of 65mm. A common lithium-ion battery in the market is cylindrical packaging, which is a widely used battery cell in the fields of laptops and high light flashlights. The advantage of this packaging is that it has unified specifications, making it easy for automation and large-scale production. In addition, prism shaped (square) flexible packaging is common in mobile phones and tablets. The more direct advantage of this packaging is its lightweight and thinness, which makes it easier to control the thickness of the product.

The safety valve is a standard configuration for each 18650 battery cell, and it is also a more important explosion-proof barrier. The working principle of the safety valve: When the internal temperature of the battery is abnormal and the air pressure rises to 1.0-1.2 Mpa, the safety valve opens to clear the internal gas, in order to avoid explosion caused by excessive pressure. Similar to the prism shaped square flexible packaging battery cells, it is common to experience pregnancy protrusions when internal pressure increases.

Here, popular science is the positive electrode inside the battery cell. The commonly used 2000-3000mAh capacity battery cells from Samsung, Panasonic, Sanyo, LG, and others have been upgraded from the first generation LiCoO2 lithium cobalt oxide to ternary materials with a chemical name of LiNi Co MnO2 nickel cobalt manganese. The direct benefits are: longer service life, safer, and better performance. Speaking of this, the prism shaped square flexible packaging mobile phone tablet cells are also made of LiNi Co MnO2 nickel cobalt manganese material, but different from the 18650 cylindrical packaging.

The 18650 cylindrical lithium-ion battery cell is mainly composed of five parts: a metal shell, a positive electrode, a negative electrode, a thin film, and an electrolyte, each of which plays its own role to ensure normal charging and discharging. The detailed structure is as follows:

Positive electrode: The positive electrode material of 18650 cylindrical lithium-ion battery cells is generally lithium iron phosphate, lithium cobalt oxide, etc. The different positive electrode materials will directly affect the characteristics and cost of 18650 lithium-ion batteries.

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