Secondary Battery

Abstract: The present invention relates to a secondary battery and, more specifically, provides a secondary battery comprising: an electrode assembly which comprises a cathode, an anode, and a separator stacked together; a first case in which the electrode assembly is accommodated and which is broken if the internal pressure thereof is a predetermined pressure or greater; and a second case which has an inner space with a negative pressure formed therein, accommodates the first case in the inner space, and captures gas discharged from the first case.

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