NOVELTY - The secondary cell has electrode roll that is provided with positive and negative foils (122,124), and fixed to cover for sealing a case. The foils are coated with positive and negative-electrode materials (123,125), and winded through separator (121) into flat shape around winding core (126). The positive and negative terminals are provided on cover. The positive and negative electrode current collector plates are connected to respective foils and terminals through cover. The positive and negative electrode current collector plates are connected to winding core.    USE - Secondary cell e.g. prismatic lithium-ion secondary cell used in hybrid vehicle and electric vehicle.    ADVANTAGE - The reduction in size and weight of secondary cell can be achieved while sufficient strength of the winding core can be improved. The winding core is directly connected to the positive and negative electrode current collector plates, so that vibration resistance and shock resistance of core can be improved. Since the positive and negative electrode supporting portions are fixed at the winding core and positive and negative electrode connecting portion, the support strength of the winding core can be improved and deflection of core can be prevented, so that vibration resistance and shock resistance of core can be improved. Since the positive and negative electrode current collector plates are connected to winding core, the electrode roll is fixed to the cover, so that reduction in endurance due to vibrations of electrode roll can be prevented. By bifurcating the positive and negative electrode current collector plates into positive and negative electrode connecting portion, the connection resistance between positive and negative electrode current collector plates and the positive and negative electrodes can be reduced without increasing the widths of the connecting portion.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of the electrode roll.    Electrode winding assembly (120)    Separator (121)    Positive and negative foils (122,124)    Positive and negative-electrode materials (123,125)    Winding core (126)