Power storage device

Patent metadata

Field	Value
Publication number	US-9859585-B2
Application number	US-201313778205-A
Country	US
Kind code	B2
Filing date	Feb 27, 2013
Priority date	Feb 29, 2012
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

To provide a sheet-like power storage device which can be curved or bent in at least one axis direction. A power storage device includes a power storage element including a plurality of flexible sheet-like positive electrodes each having one end portion fixed to a positive electrode tab; a plurality of flexible sheet-like negative electrodes each having one end portion fixed to a negative electrode tab; and a plurality of flexible sheet-like separators. The positive electrodes and the negative electrodes are alternately stacked so as to overlap with each other with the separator interposed therebetween. The power storage element is sealed in a flexible exterior body.

First claim

What is claimed is:

1. A power storage device comprising:
a supporting board of an insulator; and
power storage elements over the supporting board, each including:
a positive electrode;
a first separator over the positive electrode;
a negative electrode over the first separator; and
a second separator over the negative electrode,

wherein a plurality of the power storage elements are stacked,
wherein the positive electrode, the negative electrode, the first separator, and the second separator have sheet-like shapes and flexibility,
wherein one end portion of each of the positive electrodes is fixed to a positive electrode tab,
wherein one end portion of each of the negative electrodes is fixed to a negative electrode tab,
wherein the plurality of the power storage elements are placed between the positive electrode tab and the negative electrode tab,
wherein the supporting board comprises a first region connected to the positive electrode tab and a second region connected to the negative electrode tab, and
wherein the supporting board comprises a curved region between the first region and the second region.

2. The power storage device according to claim 1 ,
wherein each of the positive electrodes includes a positive electrode current collector and positive electrode mix layers between which the positive electrode current collector is provided, and
wherein each of the positive electrode mix layers includes positive electrode active material and graphene which cover the positive electrode active material.

3. The power storage device according to claim 1 ,
wherein each of the negative electrodes includes a negative electrode current collector and negative electrode mix layers between which the negative electrode current collector is provided, and
wherein each of the negative electrode mix layers includes negative electrode active material and graphene which cover the negative electrode active material.

4. The power storage device according to claim 3 ,
wherein a surface of each of the negative electrode mix layers has a plurality of projections.

5. The power storage device according to claim 1 ,
wherein the first separator and the second separator comprise polypropylene or polytetrafluoroethylene.

6. The power storage device according to claim 1 ,
wherein the supporting board is configured to keep a distance between the positive electrode tab and the negative electrode tab.

7. The power storage device according to claim 1 ,
wherein the supporting board and the power storage elements are sealed with a flexible exterior body.

8. A power storage device comprising:
a supporting board of an insulator; and
power storage elements over the supporting board, each including:
a positive electrode;
a first separator over the positive electrode;
a negative electrode over the first separator; and
a second separator over the negative electrode,

wherein a plurality of the power storage elements are stacked,
wherein the positive electrode and the negative electrode have sheet-like shapes and flexibility,
wherein the first separator and the second separator have a continuous sheet-like shape and flexibility,
wherein the first separator and the second separator are one separator folded so as to separate the positive electrode and the negative electrode,
wherein one end portion of each of the positive electrodes is fixed to a positive electrode tab,
wherein one end portion of each of the negative electrodes is fixed to a negative electrode tab,
wherein the plurality of the power storage elements are placed between the positive electrode tab and the negative electrode tab,
wherein the supporting board comprises a first region connected to the positive electrode tab and a second region connected to the negative electrode tab, and
wherein the supporting board comprises a curved region between the first region and the second region.

9. The power storage device according to claim 8 ,
wherein each of the positive electrodes includes a positive electrode current collector and positive electrode mix layers between which the positive electrode current collector is provided, and
wherein each of the positive electrode mix layers includes positive electrode active material and graphene which cover the positive electrode active material.

10. The power storage device according to claim 8 ,
wherein each of the negative electrodes includes a negative electrode current collector and negative electrode mix layers between which the negative electrode current collector is provided, and
wherein each of the negative electrode mix layers includes negative electrode active material and graphene which cover the negative electrode active material.

11. The power storage device according to claim 10 ,
wherein a surface of each of the negative electrode mix layers has a plurality of projections.

12. The power storage device according to claim 8 ,
wherein the first separator and the second separator comprises polypropylene or polytetrafluoroethylene.

13. The power storage device according to claim 8 ,
wherein the first separator and the second separator wrap the other end portion of each of the positive electrodes and the other end portion of each of the negative electrodes alternately.

14. The power storage device according to claim 8 ,
wherein the supporting board is configured to keep a distance between the positive electrode tab and the negative electrode tab.

15. The power storage device according to claim 8 ,
wherein the supporting board and the power storage elements are sealed with a flexible exterior body.

16. A power storage device comprising:
a supporting board of an insulator; and
a power storage element over the supporting board, including:
a first positive electrode;
a first separator over the first positive electrode;
a first negative electrode over the first separator;
a second separator over the first negative electrode;
a second positive electrode over the second separator;
a third separator over the second positive electrode; and
a second negative electrode over the third separator,

wherein one end portion of the first positive electrode and one end portion of the second positive electrode are fixed to a positive electrode tab,
wherein one end portion of the first negative electrode and one end portion of the second negative electrode are fixed to a negative electrode tab, and
wherein the plurality of the power storage elements are placed between the positive electrode tab and the negative electrode tab,
wherein the supporting board comprises a first region connected to the positive electrode tab and a second region connected to the negative electrode tab so as to keep a distance between the positive electrode tab and the negative electrode tab, and
wherein the supporting board comprises a curved region between the first region and the second region.

17. The power storage device according to claim 16 ,
wherein the first positive electrode and the second positive electrode each include a positive electrode current collector and positive electrode mix layers between which the positive electrode current collector is provided, and
wherein each of the positive electrode mix layers includes positive electrode active material and graphene which cover the positive electrode active material.

18. The power storage device according to claim 16 ,
wherein the first negative electrode and the second negative electrode each include a negative electrode current collector and negative electrode mix

Assignees

• Semiconductor Energy Lab

Inventors

• Momo Junpei

Classifications

• H01M50/136

  Flexibility or foldability · CPC title

• H01M50/129

  with two or more layers of only organic material · CPC title

• H01M50/417

  Polyolefins · CPC title

• H01M50/426

  Fluorocarbon polymers · CPC title

• H01M50/121

  Organic material · CPC title