Safety device

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PROBLEM TO BE SOLVED : To provide a safety device for surely preventing a rare short-circuited state to prevent a sudden temperature rise by providing a short-circuiting means for short-circuiting a positive electrode plate and a negative electrode plate through the deformation by an external pressure. SOLUTION : An electrode body 2 wound on a core (short-circuiting means) 1 is put in a battery case and sealed after injecting an electrolyte, whereby a battery is constituted. When the battery case is deformed by an external force as it is crushed, this force is transmitted to the core 1 through the electrode body 2. Consequently, the core 1 is deformed in such a manner that a first core part and a second core part are mutually approached. A projection 14 is protruded outward from the second core part, and penetrated into the electrode body 2. Since the positive electrode plate and the negative electrode plate are short-circuited through the projection 14, a temperature rise of the battery or the generation of a gas is prevented even if a rare short circuit occurs. Since the curvature in the winding start is increased by using the core 1, troubles such as cracks or peelings of the electrode can be prevented.