A method of manufacturing an irregular electrode, the method comprising: forming a first electrode line by continuously coating first electrode slurry on a metal sheet; forming at least one second electrode line formed with a dotted line shape including a plain portion in which electrode slurry is not present and positioned in parallel to the first electrode line by intermittently coating second electrode slurry on the metal sheet that does not overlap with the first electrode line; and forming the irregular electrode by notching the metal sheet with an irregular shape including the second electrode line and the first electrode line except for the plain portion, wherein the irregular electrode is in L-shape on a plane; wherein the forming of the second electrode line includes forming a pair of second electrode lines that extends from opposite boundaries of the first electrode line while the second electrode slurry is coated along the opposite boundaries of the first electrode line; wherein the irregular shape includes, a first electrode portion included in the first electrode line, and a second electrode portion that is included in the second electrode line, extends from the first electrode portion, and has a smaller size than the first electrode portion to form at least one step difference on a plan; and the metal sheet corresponding to the first electrode portion and the second electrode portion is notched; wherein the step difference includes a step difference corner formed at a portion at which an external circumference side of the first electrode portion and an external circumference side of the second electrode portion cross each other at an angle equal to or greater than 30 degrees to an angle less than 180 degrees; and the metal sheet is further notched to form an external circumference indented portion formed by indenting a portion of each of the first electrode portion and the second electrode portion inwardly at the step difference corner. forming a first electrode line by continuously coating first electrode slurry on a metal sheet; forming at least one second electrode line formed with a dotted line shape including a plain portion in which electrode slurry is not present and positioned in parallel to the first electrode line by intermittently coating second electrode slurry on the metal sheet that does not overlap with the first electrode line; and forming the irregular electrode by notching the metal sheet with an irregular shape including the second electrode line and the first electrode line except for the plain portion, wherein the irregular electrode is in L-shape on a plane; wherein the forming of the second electrode line includes forming a pair of second electrode lines that extends from opposite boundaries of the first electrode line while the second electrode slurry is coated along the opposite boundaries of the first electrode line; wherein the irregular shape includes, a first electrode portion included in the first electrode line, and a second electrode portion that is included in the second electrode line, extends from the first electrode portion, and has a smaller size than the first electrode portion to form at least one step difference on a plan; and the metal sheet corresponding to the first electrode portion and the second electrode portion is notched; a first electrode portion included in the first electrode line, and a second electrode portion that is included in the second electrode line, extends from the first electrode portion, and has a smaller size than the first electrode portion to form at least one step difference on a plan; and the metal sheet corresponding to the first electrode portion and the second electrode portion is notched; wherein the step difference includes a step difference corner formed at a portion at which an external circumference side of the first electrode portion and an external circumference side of the second electrode portion cross each other at an angle equal to or greater than 30 degrees to an angle less than 180 degrees; and the metal sheet is further notched to form an external circumference indented portion formed by indenting a portion of each of the first electrode portion and the second electrode portion inwardly at the step difference corner.