An electrode assembly, comprising: a cell stack part having (a) a structure in which one kind of radical unit is repeatedly disposed, the one kind of radical unit having same number of electrodes and separators which are alternately disposed and integrally combined, or (b) a structure in which at least two kinds of radical units are disposed in a predetermined order, the at least two kinds of radical units each having same number of electrodes and separators which are alternately disposed and integrally combined; an auxiliary unit (130, 140) disposed on at least one among an uppermost part or a lowermost part of the cell stack part; and a fixing part for fixing the cell stack part and the auxiliary unit (130a, 140), wherein the one kind of radical unit of (a) has a four-layered structure in which a first electrode, a first separator, a second electrode and a second separator are sequentially stacked together or a repeating structure in which the four-layered structure is repeatedly stacked; and wherein each of the at least two kinds of radical units of (b) are stacked by ones in the predetermined order to form the four-layered structure or the repeating structure in which the four-layered structure is repeatedly stacked, and each of the electrode is attached to an adjacent separator in each radical unit, adhesive strength between each of the electrode and the adjacent separator in the radical unit is greater than adhesive strength between the radical units in the cell stack part, characterized in that the separators include a coating layer having adhesive strength to attach the electrodes to the separators, the radical units of the one kind of radical unit of (a) or of the at least two kinds of radical units of (b) have different sizes, and the cell stack part has a structure in which a plurality of steps is formed by stacking the radical units having different sizes. a cell stack part having (a) a structure in which one kind of radical unit is repeatedly disposed, the one kind of radical unit having same number of electrodes and separators which are alternately disposed and integrally combined, or (b) a structure in which at least two kinds of radical units are disposed in a predetermined order, the at least two kinds of radical units each having same number of electrodes and separators which are alternately disposed and integrally combined; an auxiliary unit (130, 140) disposed on at least one among an uppermost part or a lowermost part of the cell stack part; and a fixing part for fixing the cell stack part and the auxiliary unit (130a, 140), wherein the one kind of radical unit of (a) has a four-layered structure in which a first electrode, a first separator, a second electrode and a second separator are sequentially stacked together or a repeating structure in which the four-layered structure is repeatedly stacked; and wherein each of the at least two kinds of radical units of (b) are stacked by ones in the predetermined order to form the four-layered structure or the repeating structure in which the four-layered structure is repeatedly stacked, and each of the electrode is attached to an adjacent separator in each radical unit, adhesive strength between each of the electrode and the adjacent separator in the radical unit is greater than adhesive strength between the radical units in the cell stack part, characterized in that the separators include a coating layer having adhesive strength to attach the electrodes to the separators, the radical units of the one kind of radical unit of (a) or of the at least two kinds of radical units of (b) have different sizes, and the cell stack part has a structure in which a plurality of steps is formed by stacking the radical units having different sizes.