What is inside the 18650 battery cell.
18650 lithium battery cells are currently one of the most commonly used battery cells for mobile power supplies, laptop batteries, etc. The common form is cylindrical cells with a diameter of 18mm and a length of 65mm. The most common packaging method for 18650 lithium batteries on the market is cylindrical packaging, which is widely used in the fields of laptops and high-intensity flashlights. The advantage of such packaging is that the specifications are unified, making it convenient for automation and large-scale production; In addition, there is also a square soft pack packaging, commonly used in mobile phones and tablets. The most direct advantage of this type of packaging is its thinness, which makes it easy to control the thickness of the product. Many netizens talk about 18650 battery cells and worry that they contain "liquid lithium ions", causing panic explosions. So, what is inside 18650 lithium battery cells? Puxun Lithium Battery Manufacturer is dismantling 18650 lithium battery cells here and explaining their internal structure to everyone one by one.
Firstly, when disassembling the battery cell, remember to discharge the light. Here, discharge the 18650 battery cell until it fails and there is no voltage.
Then, use sharp nose pliers to forcefully tear open the battery cell cap, separating the positive and negative steel shells to expose the safety valve and the positive and negative electrode materials of the coil.
The safety valve is a standard configuration for every 18650 battery cell and the most important explosion-proof barrier, without exception. The working principle of the safety valve: When the internal temperature of the battery is abnormal and the air pressure rises to 1.0-1.2Mpa, the safety valve opens to discharge the internal gas, avoiding explosion caused by excessive pressure. When the internal air pressure of square soft pack packaged batteries rises, the most common phenomenon is "pregnancy" bulging.
Here is a popular science about the positive electrode inside the battery cell. The commonly used 2000-3000mAh battery cells on the market, such as Samsung, Panasonic, Sanyo, LG, etc., have upgraded their internal positive electrode materials from the first generation LiCoO2 lithium cobalt oxide to ternary materials, with the chemical name LiNi-Co-MnO2 nickel cobalt manganese. The direct benefits brought are longer service life, safer, and better performance. Speaking of which, the square soft pack packaged mobile phone tablet battery cells also use LiNi-Co-MnO2 nickel cobalt manganese material, just different from the 18650 Cylinder packaging method.
Black Box Electric Bicycle 18650 Lithium Battery
Finally, take a close-up look at the materials inside the battery cell. The copper foil in the picture is used to coat LiNi-Co-MnO2 nickel cobalt manganese cathode material, while the aluminum foil is used to coat graphene. The capacity of the battery cell is obtained based on the blending ratio of these formulas. Imitation carries risks, and disassembly requires caution.
Conclusion: Through violent disassembly of 18650 lithium battery cells, it was found that there is no liquid flowing out from the inside of the battery, so there is no claim that "liquid lithium ions" are prone to explosion. In fact, under normal circumstances, as long as used correctly, 18650 battery cells do not pose any safety hazards when charged and not exposed to extreme environments.
What is the interior of 18650 lithium battery cells in this article? Compiled and provided by Shenzhen Puxun, a lithium battery manufacturer. Puxun recommends 12v lithium batteries and 36v lithium batteries
