The lithium secondary battery according to the present invention, the electrode assembly having a positive electrode plate, negative electrode plate, and a separator; Has parts housed in which the electrode assembly is housed, packaging material and sealed to put the electrode assembly and an electrolyte in a housing; And an adhesive layer entirely or partially formed on the outer surface of the packaging material. According to the present invention an adhesive layer formed on the outer casing when the internal pressure of the battery rises above the threshold to the packing material expands, bursting the packaging momentarily to function as explosion-proof safety mechanism that prevents the battery to explode.
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