NOVELTY - The battery comprises a battery case, an electrode assembly accommodated within the battery case, a cap assembly covering upper part of the battery case; upper insulator located on an upper surface of the electrode assembly, a lower insulator located on lower surface of the electrode assembly; and two gaps exist between the upper insulator and the cap assembly and between the lower insulator and the battery case. The upper insulator and the lower insulator react with liquid electrolyte. A first electrode tab is located between the upper insulator and the cap assembly.    USE - The secondary battery such as lithium secondary battery is useful as a power source for an electric tool (all claimed), a cellular phone, a camcorder, a notebook, a personal computer, and an electric vehicle.    ADVANTAGE - The secondary battery has improved vibration resistant property.    DETAILED DESCRIPTION - The battery comprises a battery case, an electrode assembly accommodated within the battery case, a cap assembly covering upper part of the battery case; upper insulator located on an upper surface of the electrode assembly, a lower insulator located on lower surface of the electrode assembly; and two gaps exist between the upper insulator and the cap assembly and between the lower insulator and the battery case. The upper insulator and the lower insulator react with liquid electrolyte. A first electrode tab is located between the upper insulator and the cap assembly. A second electrode tab is located between the lower insulator and the battery case. The insulators react with electrolyte during electrolyte wetting process. The electrode tabs are prevented from being cut during up and down vibration of the secondary battery. The insulators comprise a base material that reacts with electrolyte. A thickness of the upper insulator is 0.3-0.5 mm and that of bottom insulator is 0.1-0.3 mm. The electrode assembly is a jelly-roll type electrode assembly. The insulators react with organic solvent among the electrolyte and become swelling. The secondary battery is a cylindrical or square shaped battery.