Electronic device including secondary battery

• US 10,586,954 B2
• Filed: 05/20/2015
• Issued: 03/10/2020
• Est. Priority Date: 05/23/2014
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Takahashi, Minoru, Goto, Yuugo, Yoneda, Yumiko, Miwa, Takuya, Tajima, Ryota
• Primary Examiner(s): Vo, Jimmy
• Application Number:
  US14/717,615
• Publication Number:
  US 20150340664A1
• Time in Patent Office: 1,756 Days
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 2220/30 Batteries in portable systems, e.g. mobile phone, laptop
• CPC Class Codes: H01M 50/116 characterised by the material
• CPC Class Codes: H01M 50/119 Metals
• CPC Class Codes: H01M 50/121 Organic material
• CPC Class Codes: H01M 50/122 Composite material consisting of a mixture of organic and inorganic materials
• CPC Class Codes: H01M 50/124 having a layered structure
• CPC Class Codes: H01M 50/176 for prismatic or rectangular cells H01M50/181 takes precedence
• CPC Class Codes: H01M 50/543 Terminals
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

In the case where a film, which has lower strength than a metal can, is used as an exterior body of a secondary battery, a current collector provided in a region surrounded by the exterior body, an active material layer provided on a surface of the current collector, or the like might be damaged when force is externally applied to the secondary battery. A secondary battery which is resistant to external force is obtained. An opening is provided in a central portion of the secondary battery, and a terminal is formed in the opening. An outer edge of the secondary battery is fixed by thermocompression bonding. In addition, the central portion of the secondary battery is fixed by thermocompression bonding, so that the amount of bending is limited even when the outer edge portion of the secondary battery is bent.

Claims

1. A secondary battery comprising:

a first current collector electrically connected to a first lead line;

a second current collector electrically connected to a second lead line, the second current collector overlapping with the first current collector;

an exterior body including a first surface and a second surface opposite to the first surface; and

an electrolyte between the first current collector and the second current collector,

wherein the electrolyte is enveloped by the exterior body,

wherein an opening defined through the first current collector, the second current collector, the exterior body, and the electrolyte permits passing of an object through the opening,

wherein the first lead line is led out to the first surface and the second lead line is led out to the second surface from the opening, and

wherein the exterior body includes a film.

2. The secondary battery according to claim 1, further comprising a separator between the first current collector and the second current collector.

3. The secondary battery according to claim 1, wherein the first current collector comprises a plurality of first openings arranged in point-symmetric with respect to a center of the exterior body.

4. The secondary battery according to claim 3, wherein the second current collector comprises a plurality of second openings each overlapping with one of the plurality of first openings.

5. The secondary battery according to claim 1, wherein the opening is provided in a central portion of the exterior body.

6. The secondary battery according to claim 1,

wherein the secondary battery is flexible.

7. The secondary battery according to claim 1,

wherein edges of the opening and four outer sides of the exterior body are sealed by thermocompression bonding.

8. The secondary battery according to claim 1,

wherein the film is folded to have one folded side and three outer sides of the exterior body, and

wherein edges of the opening and the three outer sides of the exterior body are sealed by thermocompression bonding.

9. A secondary battery comprising:

a first current collector electrically connected to a first lead line;

a second current collector electrically connected to a second lead line, the second current collector overlapping with the first current collector;

an exterior body; and

an electrolyte between the first current collector and the second current collector,

wherein the electrolyte is enveloped by the exterior body,

wherein a through-hole defined through the first current collector, the second current collector, the exterior body, and the electrolyte permits passing of an object through the through-hole,

wherein the first lead line and the second lead line protrude into the through-hole, and

wherein the exterior body includes a film.

10. The secondary battery according to claim 9, further comprising a separator between the first current collector and the second current collector.

11. The secondary battery according to claim 9, wherein the first current collector comprises a plurality of first openings arranged in point-symmetric with respect to a center of the exterior body.

12. The secondary battery according to claim 11, wherein the second current collector comprises a plurality of second openings each overlapping with one of the plurality of first openings.

13. The secondary battery according to claim 9, wherein the through-hole in the exterior body is provided in a central portion of the exterior body.

14. The secondary battery according to claim 9,

wherein the exterior body includes a first surface and a second surface opposite to the first surface, and

wherein the first lead line is led out to the first surface and the second lead line is led out to the second surface from the through-hole.

15. The secondary battery according to claim 9,

wherein the secondary battery is flexible.

16. The secondary battery according to claim 9,

wherein edges of the through-hole and four outer sides of the exterior body are sealed by thermocompression bonding.

17. The secondary battery according to claim 9,

wherein the film is folded to have one folded side and three outer sides of the exterior body, and

wherein edges of the through-hole and the three outer sides of the exterior body are sealed by thermocompression bonding.