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18650 battery internal structure (steel shell-cap-safety valve-copper foil-aluminum foil)

by:dcfpower     2021-03-19
u003cpu003e  18650 battery cell is currently one of the most commonly used batteries for mobile power supplies and notebook batteries. The common form is a cylindrical battery cell with a diameter of 18mm and a length of 65mm. The most common lithium battery pack on the market is the Cylindrical (cylindrical) packaging method, which is the most widely used in the field of notebooks and strong light flashlights. The advantage of such packaging is that the specifications are unified, which is convenient for automation and large-scale production; there is also Prismatic (square ) Soft package packaging is common in mobile phones and tablet computers. The most direct benefit of this type of package is its lightness and thinness, which makes it easy to control the thickness of the product. u003c/pu003eu003cpu003e  Many netizens talked about 18650 batteries and worried that they contained liquid lithium ion.' They talked about 18650 discoloration and panic explosion. For this reason, some netizens removed an 18650 battery cell in their hands. Solution, take a look inside.u003c/pu003eu003cpu003eu003c/pu003eu003cpu003e   First of all, remember to discharge the battery when you remove the battery cell. Here, the 18650 battery cell is discharged until it fails and there is no voltage.u003c/pu003eu003cpu003eu003c /pu003eu003cpu003e   Then, use needle-nose pliers to violently tear open the cap position of the battery to separate the positive and negative steel shells, exposing the safety valve and the positive and negative materials of the coil.u003c/pu003eu003cpu003eu003c/ pu003eu003cpu003e  The safety valve is the standard configuration of every 18650 cell, and it is also the most important explosion-proof barrier. There is no one. The working principle of the safety valve: When the internal temperature of the battery is abnormal, the air pressure rises to 1.0-1.2Mpa When the safety valve is opened to remove the internal gas and avoid the explosion caused by excessive pressure. However, when the internal pressure of Prismatic square soft-packed batteries increases, the most common phenomenon is pregnancy bulge. u003c/pu003eu003cpu003eu003c/pu003eu003cpu003eu003c/pu003eu003cpu003e  Here is the positive pole inside the battery cell. Now the common battery cells of 2000-3000mAh capacity of Samsung, Panasonic, Sanyo, LG, etc. on the market, the internal cathode material has been fully upgraded from the first generation LiCoO2 lithium cobalt oxide to a ternary material, the chemical name is LiNi-Co-MnO2 nickel Cobalt manganese. Direct benefits: longer service life, safer, better performance. Speaking of this, Prismatic square soft package cell phone tablet cell is also made of LiNi-Co-MnO2 nickel cobalt manganese material, but it is different from the 18650 Cylindrical packaging method. u003c/pu003eu003cpu003eu003c/pu003eu003cpu003e   Finally, take a close-up of the material inside the battery. The copper foil in the picture is used to coat LiNi-Co-MnO2 nickel-cobalt-manganese cathode material, on the contrary, aluminum foil is used to coat graphene. The capacity of the battery cell is based on the blending ratio of these formulas. Imitation is risky, and disassembly requires caution. u003c/pu003eu003cpu003e   Conclusion: Through violent dismantling of the 18650 battery cell, it is found that there is no liquid flowing out of the battery, so there is no saying that liquid lithium ion is easy to explode. In fact, under normal circumstances, as long as it is correct Use, but charge, do not encounter extreme environments, 18650 batteries will not cause safety hazards.u003c/pu003eu003cpu003e  Recommended reading:u003c/pu003eu003cpu003eWhy does 18650 lithium batteries explode? Can safety valves be avoided? Explosion?u003c/pu003eu003cpu003eDisassembly of the internal structure of 18650 lithium batteryu003c/pu003eu003cpu003eDisassembly/disassembly of Samsung 18650 battery safety valveu003c/pu003eu003cpu003eDetailed production process of 18650 lithium battery (multiple pictures) u003c/pu003eu003c/pu003e
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