# US 11,444,311 B2 · Secondary battery and electronic device

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- Number: US 11,444,311 B2
- Document ID: US11444311B2
- Status: Granted
- Kind: B2
- Application number: 16/925,617
- Filed: 2020-07-10
- Published: 2021-01-28
- Granted: 2022-09-13
- Earliest claimed: 2014-05-29
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Semiconductor Energy Laboratory Co., Ltd.
- Inventors: Minoru Takahashi; Ryota Tajima
- Web page: https://patentgrep.com/patent/US11444311B2

## CPC

- H01M 10/0436: {Small-sized flat cells or batteries for portable equipment}
- H01G 9/048: characterised by their structure (H01G11/22 takes precedence)
- H01G 9/145: Liquid electrolytic capacitors (H01G11/00 takes precedence)
- H01M 50/105: Pouches or flexible bags
- H01M 50/116: characterised by the material
- H01M 50/119: Metals
- H01M 50/121: Organic material
- H01M 50/122: Composite material consisting of a mixture of organic and inorganic materials
- H01M 50/124: having a layered structure
- H01M 50/136: Flexibility or foldability
- H01G 11/78: Cases; Housings; Encapsulations; Mountings
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- Y02E 60/10: Energy storage using batteries
- Y02E 60/13: Energy storage using capacitors
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## 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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

The secondary battery according to claim 1, further comprising a separator positioned inside the first film and the second film.

### Claim 3 (depends on 1)

The secondary battery according to claim 1, further comprising an electrolyte positioned inside the first film and the second film,
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 surrounded by the inside surface of the first film, the second film, and the electrolyte.

### Claim 4 (depends on 1)

The secondary battery according to claim 1,
wherein one of the depressions of the outside surface of the first film and one of the projections of the inside surface of the first film are adjacent to each other.

### Claim 5 (depends on 1)

The secondary battery according to claim 1,
wherein one of the projections of the outside surface of the first film and one of the depressions of the inside surface of the first film are adjacent to each other.

### Claim 6 (depends on 1)

The secondary battery according to claim 1,
wherein the secondary battery is capable of deforming.