Flexible secondary battery

Patent metadata

Field	Value
Publication number	US-9325028-B2
Application number	US-201313889400-A
Country	US
Kind code	B2
Filing date	May 8, 2013
Priority date	Sep 14, 2012
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

A flexible secondary battery includes an electrode stack structure. The electrode stack structure includes a first electrode layer including a first metal current collector, a second electrode layer including a second metal current collector, an isolation layer between the first electrode layer and the second electrode layer, connection tabs respectively extended from an end portion of the first metal current collector at a first end portion of the first electrode layer and an end portion of the second metal current collector at a first end portion of the second electrode layer; and a fixing element which fixes the end portions of the first and second metal current collectors only at a first end portion of the electrode stack structure. Second end portions of the first and second electrode layers opposite to the first end portions thereof are movable.

First claim

What is claimed is:

1. A flexible secondary battery comprising:
an electrode stack structure comprising:
a first electrode layer comprising a first metal current collector;
a second electrode layer comprising a second metal current collector;
an isolation layer between the first electrode layer and the second electrode layer;
a first connection tab extended from an end portion of the first metal current collector at a first end portion of the first electrode layer, the first connection tab defining a first extension portion thereof;
a second connection tab extended from an end portion of the second metal current collector at a first end portion of the second electrode layer, the second connection tab defining a second extension portion thereof; and
a fixing element which fixes the end portions of the first and second metal current collectors from which the first and second connection tabs respectively extend, only at a first end portion of the electrode stack structure,
wherein
second end portions of the first and second electrode layers opposite to the first end portions thereof are movable, and
the first extension portion of the first connection tab and the second extension portion of the second connection tab are respectively connected to extended portions of a first external lead tab and a second external lead tab.

2. The flexible secondary battery of claim 1 , further comprising a protection layer on an outer surface of the electrode stack structure.

3. A flexible secondary battery comprising:
an electrode stack structure comprising;
a first electrode layer comprising a first metal current collector;
a second electrode layer comprising a second metal current collector;
an isolation layer between the first electrode layer and the second electrode layer;
connection tabs respectively extended from an end portion of the first metal current collector at a first end portion of the first electrode layer and an end portion of the second metal current collector at a first end portion of the second electrode layer; and
a fixing element which fixes the end portions of the first and second metal current collectors only at a first end portion of the electrode stack structure; and

a protection layer on an outer surface of the electrode stack structure,
wherein
second end portions of the first and second electrode layers opposite to the first end portions thereof are movable, and
a bending stiffness of the protection layer is larger than an average bending stiffness of individual layers of the electrode stack structure.

4. The flexible secondary battery of claim 3 , wherein the bending stiffness of the protection layer is at least about 1.5 times the average bending stiffness of the individual layers of the electrode stack structure.

5. The flexible secondary battery of claim 2 , wherein a thickness of the protection layer is from about 15 micrometers to about 1 millimeter.

6. The flexible secondary battery of claim 2 , wherein a tensile modulus of elasticity of the protection layer is from about 0.5 gigapascals to about 300 gigapascals.

7. The flexible secondary battery of claim 2 , wherein the protection layer comprises a polymer film, a film comprising a laminated polymer film layer, a metal foil or a complex material film comprising carbon.

8. The flexible secondary battery of claim 1 , wherein the fixing element comprises an adhesive or an adhesive-coated tape.

9. The flexible secondary battery of claim 1 , wherein
the electrode stack structure further comprises a hole defined in one end portion of each of the first metal current collector, the second metal current collector and the isolation layer at the first end portion of the electrode stack structure, and
the fixing element is in the holes.

10. The flexible secondary battery of claim 1 , wherein
the electrode stack structure further comprises a groove defined in one end portion of each of the first metal current collector, the second metal current collector and the isolation layer at the first end portion of the electrode stack structure, and the fixing element may be in the groove.

11. The flexible secondary battery of claim 1 , wherein the fixing element surrounds outer surfaces of the first end portion of the electrode stack structure.

12. The flexible secondary battery of claim 1 , further comprising a reinforcement element around the connection tabs.

13. The flexible secondary battery of claim 1 , wherein
a total length of the electrode stack structure is taken in a first direction, and
a length of the fixing element at the first end portion of the electrode stack structure is taken in a second direction perpendicular to the first direction and is about 2 millimeters or greater.

14. The flexible secondary battery of claim 1 , wherein a ratio of the total length of the electrode stack structure to the length of the fixing element is 20 or less.

15. A method of manufacturing a flexible secondary battery, the method comprising:
providing an electrode stack structure of which layers thereof are fixed at only a first end portion thereof, comprising:
providing a first electrode layer comprising a first metal current collector,
providing a second electrode layer comprising a second metal current collector,
providing an isolation layer between the first electrode layer and the second electrode layer,
providing a first connection tab extended from the end portion of the first metal current collector at a first end portion of the first electrode layer, the first connection tab defining a first extension portion thereof,
providing a second connection tab extended from the end portion of the second metal current collector at a first end portion of the second electrode layer, the second connection tab defining a second extension portion thereof; and
providing a fixing element which fixes the end portions of the first and second metal current collectors from which the first and second connection tabs respectively extend, only at the first end portion of the electrode stack structure,
wherein
second end portions of the first and second electrode layers opposite to the first end portions thereof are movable, and
the first extension portion of the first connection tab and the second extension portion of the second connection tab are respectively connected to extended portions of a first external lead tab and a second external lead tab.

16. The method of claim 15 , wherein the providing a fixing element contacts the fixing element with the first and second metal current collectors.

17. The method of claim 15 , wherein the providing a fixing element contacts the fixing element with only outer surfaces of the first and second metal current collectors.

Assignees

• Samsung Electronics Co Ltd
• Samsung Sdi Co Ltd

Inventors

• Kwon Moon-Seok
• Choi Jae-Man
• Doo Seok-Gwang
• Shon Jeong-Kuk
• Song Min-Sang
• Hwang Seung-Sik

Classifications

• H01M10/0436 Primary

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

• H01M50/457

  comprising three or more layers · CPC title

• H01M10/0463

  Cells or batteries with horizontal or inclined electrodes · CPC title

• H01M50/463

  Separators, membranes or diaphragms characterised by their shape · CPC title

• H01M50/531

  Electrode connections inside a battery casing · CPC title