NOVELTY - Easy filling of the battery with electrolyte solution and minimization of excessive electrolyte solution in the battery are achieved by providing the solution injection opening, e.g., at one end of the wound electrode body and passing the injection solution needle through the center of the battery core through which the electrolyte solution is injected and extracted by means of a nozzle.    USE - Motor driving power source for an electric vehicle or a hybrid electric vehicle.    ADVANTAGE - The amount of excessive electrolyte solution to be filled into the battery is kept to a minimum level. Filling is simplified. The battery has improved reduction in current collection resistance and improved anti-vibration performance.    DETAILED DESCRIPTION - A lithium secondary battery comprising an internal electrode body formed by winding positive electrode, separator and negative electrode arrangement around the outer periphery of a core, and an electrolyte solution impregnating the internal electrode, comprises:    (a) inserting the tip of a nozzle for injecting electrolyte solution, to such a depth that it reaches a position on an end surface of the internal electrode body located on another opposite side, through a through hole of the core and an electrolyte solution injection opening integrally formed with an external terminal in an extended position of the through hole of the core on one end surface of the battery;    (b) injecting the electrolyte solution until at least the internal electrode body is immersed; and    (c) extracting excessive electrolyte solution remaining within the battery by using a nozzle.    The electrolyte solution opening is located in the center of one end surface of the battery and/or the core is located in the center of the battery.    The battery has a capacity of 2 Ah or more.    INDEPENDENT CLAIMS are given for lithium secondary battery structures.    DESCRIPTION OF DRAWING(S) - The drawing illustrates the method of filling the battery with the electrolyte solution.    Internal electrode body (1)    Separator (4)    Electricity extraction tabs (5)    Core (6)    Through hole (7)    Electrolyte solution injection/extraction nozzle (12)    External terminals (13)    Internal terminals (14)    Caps (21, 22)    Battery (10)