Cell
AssigneeSony Corporation
InventorsKazuhito Hatta, Mashio Shibuya
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Abstract
A cell is provided. The cell includes a cell element including a positive electrode, a negative electrode, an electrolyte and a laminate film including an exterior layer, a metal layer, an interior layer, and a welded layer formed of the interior layer; wherein a thickness of the welded layer is larger than 5 μm in a flat portion of the interior layer, wherein the welded layer increases in thickness from the flat portion to an end portion of the welded layer, and wherein when a thickness of the laminate film is t, a thickness of the interior layer is p and a thickness of the laminate film in the welded layer is t1, a following equation is satisfied: t×2−p×2+5<t1<t×2−5 (μm).
Claims19
A cell comprising:
- a cell element including a positive electrode, a negative electrode, an electrolyte and a laminate film including an exterior layer, a metal layer, an interior layer, and a welded layer formed of the interior layer;
- wherein a thickness of the welded layer is larger than 5 μm in a flat portion of the interior layer,
- wherein the welded layer increases in thickness from the flat portion to an end portion of the welded layer, and
- wherein when a thickness of the laminate film is t, a thickness of the interior layer is p and a thickness of the laminate film in the welded layer is t1, a following equation is satisfied:
- t×2−p×2+5<t1<t×2−5 (μm).
A method of forming a cell including a cell element, comprising:
- providing a laminate film to enclose the cell element, wherein the laminate film includes an exterior layer, an interior layer, and a metal layer,
- welding the laminate film to form a welded layer of the interior layer, while not welding the laminate film in an edge portion,
- wherein a thickness of the welded layer is larger than 5 μm in a flat portion of the welded layer,
- wherein the welded layer increases in thickness from the flat portion to an end portion of the welded layer, and
- wherein when a thickness of the laminate film is t, a thickness of the interior layer is p and a thickness of the laminate film in the welded layer is t1, a following equation is satisfied:
- t×2−p×2+5<t1<t×2−5 (μm).
Dependencies are inferred from the claim text.