| 摘要 |
The present invention relates to a stack-folding type electrode assembly of a structure in which unit cells including a negative electrode where a negative electrode compound is spread on a negative electrode current collector are wound by a separation film, and more specifically, to a stack-folding type electrode assembly comprising two or more first type unit cells and two or more second type unit cells, and featuring that the thickness of a negative electrode current collector of the first type unit cell and the thickness of the negative electrode current collector of the second type unit cell are different; and the thickness of the negative electrode current collector in the first type unit cells or the second type unit cells located at the outermost layer (n floor; a natural number greater than or equal to 2) of the stack-folding type electrode assembly is relatively bigger than the thickness of the negative electrode current collector in the second type unit cells or the first type unit cells located at an internal layer (n-1 floor; a natural number greater than or equal to 2) facing the outermost layer, and to a secondary battery comprising the same. |
