Secondary battery having an insulation member

A secondary battery comprising:

• an electrode assembly;
• a case accommodating the electrode assembly, the case having a bottom surface and long and short sidewalls that extend upwardly from the bottom surface;
• a cap plate coupled to an upper portion of the case and sealing the case;
• and
• an insulation member attached to an outer surface of the case, the insulation member comprising a first layer in contact with the outer surface of the case and made of a heat-resistant material, a third layer exposed to the outside and made of a stretchable material, and a second layer between the first and third layers and made of an insulating material, each of the first, second, and third layers comprising thermoplastic,
• wherein a first surface of the second layer directly contacts the first layer and an opposite second surface of the second layer directly contacts the third layer.