Secondary battery and electronic device

Patent metadata

Field	Value
Publication number	US-12489134-B2
Application number	US-202418623238-A
Country	US
Kind code	B2
Filing date	Apr 1, 2024
Priority date	May 29, 2014
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

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, sealing 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.

First claim

What is claimed is:

1 . A secondary battery comprising a film,
wherein the film has a first region with a first type of projections and depressions and a second region with a second type of projections and depressions, wherein the second type of projections and depressions is different from the first type of projections and depressions, wherein depths of the depressions in the second type of projections and depressions are smaller than depths of the depressions in the first type of projections and depressions, wherein heights of the projections in the second type of projections and depressions are smaller than heights of the projections in the first type of projections and depressions, wherein the secondary battery has flexibility, wherein the secondary battery is a multi-stable flexible secondary battery having at least a first stable condition and a second stable condition, wherein the first stable condition is fixed while being bent, wherein the second stable condition is different from the first stable condition, wherein the secondary battery deforms repeatedly between the first stable condition and the second stable condition, and wherein the first type of projections and depressions comprises a portion having a first thickness and a portion having a second thickness.

2 . The secondary battery according to claim 1 , wherein the second stable condition is flat.

3 . The secondary battery according to claim 1 , further comprising at least a positive electrode active material layer, a negative electrode active material layer and an electrolyte solution in a space inside the film which is folded.

4 . The secondary battery according to claim 1 , wherein the second thickness is different from the first thickness.

5 . The secondary battery according to claim 1 , wherein the first region is closer to a center of the film than the second region.

6 . An electronic device comprising:
a housing; the secondary battery according to claim 1 , the secondary battery being in the housing; and a display device in the housing, the display device being electrically connected to the secondary battery.

7 . A secondary battery comprising a film,
wherein the film has a first region with a first type of projections and depressions and a second region with a second type of projections and depressions, wherein the second type of projections and depressions is different from the first type of projections and depressions, wherein depths of the depressions in the second type of projections and depressions are smaller than depths of the depressions in the first type of projections and depressions, wherein heights of the projections in the second type of projections and depressions are smaller than heights of the projections in the first type of projections and depressions, wherein the first region and the second region are connected to each other via a boundary, wherein the secondary battery has flexibility, wherein the secondary battery is a multi-stable flexible secondary battery having at least a first stable condition and a second stable condition, wherein the first stable condition is fixed while being bent, wherein the second stable condition is different from the first stable condition, wherein the secondary battery deforms repeatedly between the first stable condition and the second stable condition, and wherein the first type of projections and depressions comprises a portion having a first thickness and a portion having a second thickness.

8 . The secondary battery according to claim 7 , wherein the second stable condition is flat.

9 . The secondary battery according to claim 7 , further comprising at least a positive electrode active material layer, a negative electrode active material layer and an electrolyte solution in a space inside the film which is folded.

10 . The secondary battery according to claim 7 , wherein the second thickness is different from the first thickness.

11 . The secondary battery according to claim 7 , wherein the first region is closer to a center of the film than the second region.

12 . An electronic device comprising:
a housing; the secondary battery according to claim 7 , the secondary battery being in the housing; and a display device in the housing, the display device being electrically connected to the secondary battery.

Assignees

• Semiconductor Energy Lab

Inventors

• Takahashi Minoru
• Tajima Ryota

Classifications

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01G9/145

  Liquid electrolytic capacitors (H01G11/00 takes precedence) · CPC title

• H01G9/048

  characterised by their structure (H01G11/22 takes precedence) · CPC title

• H01M50/119

  Metals · CPC title

• H01M50/122

  Composite material consisting of a mixture of organic and inorganic materials · CPC title