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US 11,444,311 B2Granted
Secondary battery and electronic device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsMinoru Takahashi, Ryota Tajima
Life of this patent
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Abstract
A secondary battery suitable for a portable information terminal or a wearable device is provided. An electronic device having a novel structure which can have various forms and a secondary battery that fits the forms of the electronic device are provided. In the secondary battery, scaling is performed using a film provided with depressions or projections that ease stress on the film due to application of external force. A pattern of depressions or projections is formed on the film by pressing, e.g., embossing.
Claims6
A secondary battery comprising:
- a first film;
- a second film;
- a positive electrode current collector;
- a positive electrode active material layer;
- a negative electrode current collector;
- and
- a negative electrode active material layer,
- wherein each of an inside surface and an outside surface of the first film has a first pattern of depressions or projections with a first pitch,
- wherein each of an inside surface and an outside surface of the second film has a second pattern of depressions or projections with a second pitch,
- wherein the first pitch is smaller than the second pitch, and
- wherein the positive electrode current collector, the positive electrode active material layer, the negative electrode current collector, and the negative electrode active material layer are positioned inside the first film and the second film.
8 more elements
Dependencies are inferred from the claim text.