Pouch-shaped secondary battery having structure in which bidirectional cell is changed to unidirectional cell

A pouch-shaped secondary battery comprising a unit cell assembly received within a pouch sheathing member, the unit cell assembly comprising:

• two or more stacked bicells, each bicell including an electrode assembly including a first electrode and a second electrode stacked in a state in which a separator is interposed between the first electrode and the second electrode, a first electrode tab and a second electrode tab protruding from the respective first electrode and second electrode at opposite sides of the electrode assembly, the first electrode tab and the second electrode tab joined to respective first and second electrode leads;
• first and second unidirectional structures, the first unidirectional structure having a planar surface thereof disposed adjacent a first planar surface of the pouch sheathing member, the second unidirectional structure having a planar surface thereof disposed adjacent a second planar surface of the pouch sheathing member opposite the first planar surface, the two or more stacked bicells each being disposed between the first and second unidirectional structures, each of the first and second unidirectional structures having respective first and second opposite ends, the first end of each of the first and second unidirectional structures joined to the first electrode lead of each of the two or more stacked bicells, the second end of each of the first and second unidirectional structures extending in a direction toward the second electrode lead of each of the two or more stacked bicells;
• and
• first and second electrode terminals exposed to an outside of the pouch sheathing member and extending from a single common side of the pouch sheathing member, the first electrode terminal being or extending from the second end of the each of the first and second unidirectional structures, and the second electrode terminal being or extending from an end of the second electrode lead of each of the two or more stacked bicells,
• wherein the first electrode terminal and the second electrode terminal have different polarities.