Patent ID: 8871383

Claim:
A cell comprising: a cell element including a positive electrode, a negative electrode, and an electrolyte; and a laminate film enclosing the cell element, the laminate film having a sealing portion and an edge portion, the sealing portion being inward of the edge portion, wherein, the positive electrode and the negative electrode are respectively connected to a positive electrode terminal and a negative electrode terminal, the positive and negative electrode terminals extending through the sealing portion and beyond an edge of the edge portion such that portions of the positive and negative electrode terminals are exposed beyond the edge with respect to the laminate film, a thickness t 1 of the laminate film at the sealing portion is thinner than a thickness t 2 of the laminate film at the edge portion, the edge portion being between the sealing portion and the exposed portions of the positive and negative electrode terminals, the sealing portion is welded, and the edge of the laminate film is not welded.