Electronic device including secondary battery

Patent metadata

Field	Value
Publication number	US-2023246224-A1
Application number	US-202318132504-A
Country	US
Kind code	A1
Filing date	Apr 10, 2023
Priority date	May 23, 2014
Publication date	Aug 3, 2023
Grant date	—

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 in 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.

First claim

What is claimed is:

1 . A secondary battery comprising:
a first current collector comprising a first tab; a second current collector comprising a second tab, the second current collector overlapping with the first current collector; a first lead line electrically connected to the first current collector via the first tab; a second lead line electrically connected to the second current collector via the second tab; an electrolyte; and an exterior body comprising a film, the exterior body comprising a first surface and a second surface opposite to the first surface, wherein the exterior body comprises an opening filled with an insulator, wherein the opening is configured to arranged so as to pass through the first current collector, the second current collector and the exterior body between the first surface and the second surface of the exterior body, wherein each of a periphery of the exterior body and a periphery of the opening is bonded by compression bonding so that the electrolyte is sealed in the exterior body, wherein the first tab is arranged to be protruded into the opening from an inside of the exterior body, and the second tab is arranged to be protruded into the opening from the inside of the exterior body, wherein each of the first lead line and the second lead line is positioned in a direction crossing the first surface and the second surface of the exterior body, and wherein the first lead line is arranged to be extending in a first direction, and the second lead line is arranged to be extending in a second direction opposite to the first direction.

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 opening is provided in a central portion of the exterior body.

4 . The secondary battery according to claim 3 , wherein the first current collector further comprises a plurality of first openings arranged in point-symmetric with respect to the opening.

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

6 . The secondary battery according to claim 1 , wherein the secondary battery is flexible.

Assignees

• Semiconductor Energy Lab

Inventors

• Takahashi Minoru
• Goto Yuugo
• Yoneda Yumiko
• Miwa Takuya
• Tajima Ryota

Classifications

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/0436 Primary

  Small-sized flat cells or batteries for portable equipment · CPC title

• H01M50/176

  for prismatic or rectangular cells (H01M50/181 takes precedence) · CPC title

• H01M50/121

  Organic material · CPC title

• H01M50/119

  Metals · CPC title