Secondary battery comprising a jelly roll type electrode assembly in which an intermittent plain portion is formed on a positive electrode current collector

摘要

According to the present invention, a positive electrode having a positive electrode active material coating portion on at least one surface of a positive electrode current collector and a negative electrode having a negative electrode active material coating portion on at least one surface of the negative electrode current collector face each other with a separation membrane interposed therebetween. An electrode assembly wound in a jelly roll structure; and a positive electrode tab and a negative electrode tab that are electrically connected to the positive electrode current collector and the negative electrode current collector, respectively, and project outside the electrode assembly; The positive electrode current collector relates to a secondary battery in which an intermittent plain portion having no positive electrode active material coating portion is formed in a part corresponding to a bent surface when wound.