SECONDARY BATTERY AND BATTERY PACK INCLUDING THE SAME

A secondary battery has a short-circuit part accommodated in the exterior and electrical conductivity is attached to the separator in the electrode assembly, The short-circuit part is spaced apart from the positive electrode tab and the negative electrode tab at a temperature less than a predetermined temperature, and the short-circuit part is in contact with the positive electrode tab and the negative electrode tab by contraction of the separator, to which the short-circuit part is attached, at a temperature equal to or greater than the predetermined temperature to electrically connect the positive electrode tab to the negative electrode tab.