A secondary battery is disclosed.
According to the present invention, in a case in which the secondary battery is ignited, a gas and materials within the secondary battery may be smoothly discharged to improve safety when the secondary battery is ignited.
In order to achieve the above-described object, according to an aspect of the present invention, a secondary battery includes: an electrode assembly; a battery can accommodating the electrode assembly; and a coating part applied to the battery can, wherein the battery can includes a slim part having a relatively thinner thickness than that of the other region of the battery can, and the coating part is applied to the slim part and made of a metal material having tensile strength less than that of the slim part.