FIG. 1 is a view illustrating a state in which a thin pouch battery is curved in a right-left direction or in a front-rear direction. In a curved case, since the difference between extended circumferential lengths after curvature of laminate film 102 on the lower side and a top surface of protrusion 103 in which electrodes are accommodated, of laminate film 101 on the upper side, wrinkling or cracking appears on the surface of the laminate film.

Therefore, according to various exemplary embodiments discussed herein, concave-convex wave shapes are formed on the laminate film, and wave-shaped crest ridges or trough furrows are bent and continuous or are dotted around such that wrinkling or cracking does not appear in the laminate film, even when the laminate film, extends in every direction, thereby being curved in every direction.

FIG. 2 is a view illustrating a state in which a concave-convex wave-shaped crest ridge or a trough furrow formed on a laminate film is bent. Wave-shaped crest ridge or trough furrow 105 formed on the laminate film is parallel to side surfaces 106 of protrusion 103 in the right-left direction, is continuous by a certain length, then is changed in angle, is parallel to side surfaces 107 in the front-rear direction, and is continuous by a certain length.