Energy storage device

Patent metadata

Field	Value
Publication number	US-9905369-B2
Application number	US-201314381306-A
Country	US
Kind code	B2
Filing date	May 20, 2013
Priority date	May 22, 2012
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Provided is an energy storage device including a container with high productivity and satisfactory corrosion resistance. In the energy storage device including the container housing an electrode assembly having a positive electrode and a negative electrode, and electrolyte solution, the container is made of stainless steel including 0.09% by weight or more aluminum and has welded portions and where the stainless steel is welded.

First claim

The invention claimed is:

1. An energy storage device comprising:
a container comprising a main body and a lid body connected to the main body, and housing an electrode assembly including a positive electrode and a negative electrode, and electrolyte solution,
wherein the container is made of stainless steel including 0.09% by weight or more aluminum,
wherein the main body includes a welded portion where the stainless steel is welded, and
wherein the main body further comprises:
a long-side face
a short-side face which is joined to the long-side face, at least a part of the welded portion being positioned on the short-side face; and
a bottom face which is joined to the short-side face by the welded portion, an end of the welded portion being formed at a corner formed by the long-side face, the short-side face and the bottom face.

2. The energy storage device according to claim 1 , wherein the stainless steel includes 16 to 30% by weight chromium and 0.3% by weight or less aluminum.

3. The energy storage device according to claim 1 , wherein the container and the electrode assembly are electrically insulated from each other.

4. The energy storage device according to claim 1 , wherein the main body is in a rectangular parallelepiped shape.

5. The energy storage device according to claim 4 , wherein the main body further comprises a first folded portion connecting the long-side face of the main body to the bottom face of the main body.

6. The energy storage device according to claim 5 , wherein the main body further comprises a second folded portion connecting the short-side face of the main body and the long-side face of the main body.

7. The energy storage device according to claim 6 , wherein the main body further comprises an other long-side face, and a third folded portion connecting the short-side face of the main body and the other long-side face of the main body.

8. The energy storage device according to claim 7 , wherein the short-side face includes a first side portion connected to the long-side face by the second folded portion, and a second side portion connected to the other long-side face by the third folded portion, and the welded portion joins the first and second side portions.

9. The energy storage device according to claim 8 , wherein a width of the first side portion of the short-side face is substantially equal to a width of the second side portion of the short-side face.

10. The energy storage device according to claim 8 , wherein the main body further comprises an other short-side face including a first side portion connected to the long-side face by a fourth folded portion, and a second side portion connected to the other long-side face by a fifth folded portion, and the welded portion joins the first and second side portions of the other short-side face.

11. The energy storage device according to claim 1 , wherein an open circuit voltage of the positive electrode is 4.0 V or greater with respect to a lithium potential.

12. The energy storage device according to claim 1 , wherein the main body further comprises an other long-side face which is joined to the short-side face, and
wherein the welded portion extends from the corner formed by the long-side face, the short-side face and the bottom face, to an other corner formed by the other long-side face, the short-side face and the bottom face.

13. An energy storage device comprising:
a container comprising:
a lid body; and
a main body connected to the lid body and comprising:
a plurality of faces; and
a welded portion being formed one of between the plurality of faces and in a face of the plurality of faces; and

an electrode assembly housed in the container and electrically insulated from the container,
wherein the main body comprises stainless steel including aluminum in a range of 0.09% and 0.3% by weight and chromium in a range from 16% to 30%, and
wherein the plurality of faces comprises:
a first long-side face
a first short-side face which is joined to the first long-side face, at least a part of the welded portion being positioned on the first short-side face; and
a bottom face which is joined to the first short-side face by the welded portion, an end of the welded portion being formed at a corner formed by the first long-side face, the first short-side face and the bottom face.

14. The energy storage device according to claim 13 , wherein the first short-side face comprises first and second sides joined by the welded portion, and
wherein the plurality of faces further comprises a second short-side face comprising first and second sides joined by the welded portion.

15. The energy storage device according to claim 14 , wherein the first long-side face is connected to the first side of the first short-side face by a first folded portion, and connected to the first side of the second short-side face by a second folded portion.

16. The energy storage device according to claim 15 , wherein the plurality of faces further comprises:
a second long-side face which is connected to the second side of the first short-side face by a third folded portion, and connected to the second side of the second short-side face by a fourth folded portion.

17. The energy storage device according to claim 16 , wherein the bottom face is joined to the first and second short-side faces by the welded portion, joined to the first long-side face by a fifth folded portion, and joined to the second long-side face by a sixth folded portion.

Assignees

• Gs Yuasa Int Ltd
• Lithium Energy Japan

Inventors

• Ioka Hirotsugu
• Anami Keisuke
• Kitano Shinya
• Munenaga Noriyoshi
• Nakamura Taku

Classifications

• H01M50/147

  Lids or covers · CPC title

• H01M50/145

  for protecting against corrosion · CPC title

• H01M50/119

  Metals · CPC title

• C22C38/06 Primary

  containing aluminium · CPC title

• H01M50/10 Primary

  Primary casings; Jackets or wrappings · CPC title