NOVELTY - The battery has an electrode jelly roll (20) placed inside a tin (100) and comprising a current collector of positive electrode (10), a separator and a current collector of negative electrode (12) stacked in turn and wound. A lead tab (140a) connected to the current collector of positive electrode and the current collector of the negative electrode is placed on opposing sides of the electrode jelly roll. A lateral cap assembly (120) located on each opposing side of the tin is in electrical contact with the lead tab.    USE - Middle or large sized battery for use in an electric vehicle to convert chemical energy generated in an electrochemical oxidation-deoxidation reaction into electric energy.    ADVANTAGE - The lateral cap assembly located on each opposing side of the tin is in electrical contact with the lead tab to improve volume energy density for preparing an end cell with large capacity while improving structure of the tin and an internal connecting system of the electrodes in the battery. The battery is designed such that the tin is formed from a molded metal material that is strong in property and coupling between a coupling part and the lead tab is performed by welding, so that the lateral cap assembly is separated from the tin, and the coupling between the coupling part and the lead tab is sustained in a curved shape when the lead tab is pressed by the coupling part, where the sustained coupling can be enhanced by configuring the lead tab with a flexible shape, thus reducing volume of the tin by reducing volume in which the lead tab is equipped, and hence reducing volume of the battery in an effective manner. The battery allows a rubber pad to realize the coupling between the tin and the lateral cap assembly without requiring additional welding and to fix the electrode jelly roll inside the tin, so that the electrode jelly roll can be prevented from being shaken by external shock.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view illustrating a structure and a process for manufacturing a middle or large sized battery.    Current collector of positive electrode (10)    Current collector of negative electrode (12)    Electrode jelly roll (20)    Tin (100)    Lateral cap assembly (120)    Lead tabs (140a, 140b)