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Disassembly of internal structure of 18650 lithium battery

18650 batteries have been dismantled for some time. Today, one is violently dismantled to show you the internal structure of the battery. It is mainly to show you the so-called "safety valve". Open the battery head with needle-nose pliers. Disassemble the battery head and see the internal structure. Remove the battery positive cap. The internal structure of the battery and remove the insulation cover of the positive cap. The dismantled positive cap is the so-called "safety valve". It is a bit like touch switch, and the battery 0V has a direct relationship with the removal of the protective cover. The inside of the battery is like a tree ring, accompanied by wet electrolyte.