Cell

A cell comprising:

• a cell element including a positive electrode, a negative electrode, 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 laminate film comprises an interior layer, a metal layer, and an exterior layer;
• an electrode terminal;
• and
• a sealant between the electrode terminal and the laminate film,
• 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 t1 of the laminate film at the sealing portion is thinner than a thickness t2 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,
• wherein letting t and p represent a thickness of the laminate film and a thickness of the interior layer, respectively, the cell is configured such that a relationship in which t×2−p×2+5<t1<t×2−5 is satisfied, and
• wherein letting t4 represent a thickness of the laminate film, the electrode terminal, and the sealant in the sealing portion, letting L represent a thickness of the electrode terminal, and letting S represent a thickness of the sealant, the cell is configured such that a relationship in which t×2−p×2+5+(L+S)<t4<t×2−5+(L+S) is satisfied.