NOVELTY - The battery (1000) has an electrode structure (200) that is accommodated and sealed in a pouch (100). The first sections (300) are provided in the pouch and provided to the sides of the electrode structure to support the electrode structure. The second sections (400) are provided in the pouch to be parallel to the first sections and provided between the first sections and the pouch to be convexly deformed toward the pouch according to a temperature increase. The second section is provided with a deformation degree increased according to the temperature increase.    USE - Secondary battery such as nickel-cadmium battery, nickel-metal hydride battery, nickel-hydrogen battery and lithium secondary battery used in secondary battery pack (claimed) for digital camera, cellular phone, notebook and hybrid vehicle.    ADVANTAGE - Since the second sections are deformed to be convexly bent toward the pouch and the first sections are configured to adhere the electrode structure to allow the stacked positive and negative electrode plates and the separation membrane to be adhered to each other, the interface resistance is maintained and thus the performance of the secondary battery is prevented from being degraded. Since the secondary battery is maintained in the state in which the electrode structure is adhered even in the case in which the pouch is swelled at the time of the high temperature, the increase in the interface resistance of the electrode structure according to the temperature increase is prevented. Thus, the performance degradation of the secondary battery is prevented, the fine short circuit is prevented and the risk of ignition and explosion of the secondary battery is decreased. The overcharging or the over-discharging are prevented by using the second section which is not restored after being deformed, thus the stability is improved.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a secondary battery pack.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of the secondary battery.    Pouch (100)    Electrode structure (200)    Electrode tabs (210)    Sections (300,400)    Secondary battery (1000)