Energy storage device

Patent metadata

Field	Value
Publication number	US-10833298-B2
Application number	US-201615760940-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Sep 18, 2015
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

An energy storage device includes an electrode body in which an electrode is wound, a case that stores the electrode body, and spacers (side spacers) interposed between the case and the electrode body. The spacers each have an opening that exposes a portion of faces of curved portions of the electrode body from one end to the other end of the electrode body in a winding axis direction of the electrode body.

First claim

The invention claimed is:

1. An energy storage device, comprising:
an electrode body in which an electrode is wound;
a case configured to store the electrode body; and
a spacer interposed between the case and the electrode body,
wherein the spacer includes an opening extending in a winding axis direction of the electrode body, and
wherein a portion of a face of a curved portion of the electrode body is disposed in the opening, the portion of the face of the curved portion of the electrode body continuously extending from one end to an other end of the electrode body in the winding axis direction of the electrode body.

2. The energy storage device according to claim 1 , wherein the portion of the face of the curved portion of the electrode body is flush with an outer face of the spacer.

3. The energy storage device according to claim 1 , wherein the electrode body comprises an ellipse including two curved portions, and
wherein spacers each including the spacer are provided on each of the two curved portions.

4. The energy storage device according to claim 1 , wherein the electrode body is disposed such that the one end in the winding axis direction of the electrode body is opposed to a cover plate of the case.

5. The energy storage device according to claim 1 , wherein the case includes a rectangular storage recess when viewed in the winding axis direction, and
wherein the spacer is disposed along a side face forming a short side of the rectangular storage recess.

6. The energy storage device according to claim 1 , wherein the portion of the face of the curved portion of the electrode body includes an apex of the curved portion.

7. The energy storage device according to claim 1 , wherein the winding axis direction of the electrode body is perpendicular to a longitudinal direction of an extension of the electrode body.

8. The energy storage device according to claim 1 , wherein the portion of the face of the curved portion of the electrode body is exposed from the opening.

9. The energy storage device according to claim 1 , wherein the portion of the face of the curved portion of the electrode body penetrates into the opening.

10. The energy storage device according to claim 1 , wherein the case comprises a short side surface and a long side surface, which is longer than the short side surface, and
wherein, along the short side surface, the portion of the face of the curved portion of the electrode body continuously extends from the one end to the other end of the electrode body in the winding axis direction of the electrode body.

11. The energy storage device according to claim 10 , wherein, along the short side surface, the portion of the face of the curved portion of the electrode body is exposed from the opening.

12. An energy storage device, comprising:
an electrode body in which an electrode is wound;
a case configured to store the electrode body; and
a spacer interposed between the case and the electrode body,
wherein the spacer includes an opening configured to expose a portion of a face of a curved portion of the electrode body, the portion of the face of the curved portion of the electrode body continuously extending from one end to an other end of the electrode body in a winding axis direction of the electrode body.

13. The energy storage device according to claim 12 , wherein the portion of the face of the curved portion of the electrode body is exposed from the opening.

14. The energy storage device according to claim 12 , wherein the portion of the face of the curved portion of the electrode body penetrates into the opening.

15. An energy storage device, comprising:
an electrode body in which an electrode is wound;
a case configured to store the electrode body; and
a spacer interposed between the case and the electrode body,
wherein the spacer includes an opening configured to expose a portion of a face of a curved portion of the electrode body from one end to an other end of the electrode body in a winding axis direction of the electrode body,
wherein the electrode body includes a main body and positive and negative tab portions protruding from one end of the main body in the winding axis direction of the electrode body, and
wherein the portion of the face of the curved portion of the electrode body continuously extends from the one end to the other end of the electrode body in the winding axis direction of the electrode body.

16. The energy storage device according to claim 15 , wherein the portion of the face of the curved portion of the electrode body penetrates the opening.

Assignees

• Gs Yuasa Int Ltd

Inventors

• Kawate Kenji
• Kawahara Takeshi
• Nishikawa Tomoko

Classifications

• H01M6/02 Primary

  Details (of electrodes H01M4/00; of non-active parts H01M50/00) · CPC title

• H01M50/477

  characterised by their shape · CPC title

• H01M50/474

  characterised by their position inside the cells · CPC title

• H01M50/593

  Spacers; Insulating plates · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title