Battery unit and lithium secondary battery employing the same

摘要

A battery unit and a lithium secondary battery employing the same are provided. The battery unit includes a positive electrode plate having a positive current collector and a positive active material layer formed on at least one plane of the positive current collector, a positive electrode lead electrically connected with the positive current collector, a negative electrode plate having a negative current collector and a negative active material layer formed on at least one plane of the negative current collector, a negative electrode lead electrically connected with the negative current collector, and a separator interposed between the positive electrode plate and the negative electrode plate, having a width greater than that of each electrode plate, and having different widths of protruding portions which stick out on either side of the electrode plate.