Electric storage device

Patent metadata

Field	Value
Publication number	US-9806317-B2
Application number	US-201314419112-A
Country	US
Kind code	B2
Filing date	Jul 16, 2013
Priority date	Aug 3, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The electric storage device disclosed herein is a stacked type electric storage device. The electric storage device includes a separator insulating a first electrode from a second electrode. The electric storage device includes a first conductive path from a first electrode terminal to the first electrode, a second conductive path from a second electrode terminal to the second electrode, and a current interruption device disposed between the second electrode terminal and the second electrode, the current interruption device being configured to interrupt the second conductive path. The separator includes a first surface part covering the one surface of the first electrode, a second surface part covering the other surface of the first electrode, and a connection part connected to both the first and second surface parts. The connection part is disposed between the current interruption device and an end of the first electrode on a current interruption device side.

First claim

The invention claimed is:

1. A stacked type electric storage device comprising:
a case;
a sheet-like first electrode disposed within the case;
a sheet-like second electrode disposed within the case, wherein a polarity of the second electrode is different from that of the first electrode;
a separator insulating the first electrode from the second electrode;
a first electrode terminal and a second electrode terminal provided on the case;
a first conductive path from the first electrode terminal to the first electrode;
a second conductive path from the second electrode terminal to the second electrode; and
a current interruption device disposed between the second electrode terminal and the second electrode in the case, the current interruption device being configured to interrupt the second conductive path,
wherein
one surface of the first electrode faces one surface of the second electrode,
the separator includes: a first surface part covering the one surface of the first electrode, a second surface part covering the other surface of the first electrode, and a connection part connected to both the first surface part and the second surface part,
the connection part is disposed between the current interruption device and an end of the first electrode on a current interruption device side, and
the connection part contacts a surface of the current interruption device.

2. The stacked type electric storage device according to claim 1 , wherein
the separator covers the surface of the first electrode, and is larger than the surface of the first electrode.

3. The stacked type electric storage device according to claim 2 , wherein
the first electrode includes a sheet-like first metal foil,
the second electrode includes a sheet-like second metal foil,
the first metal foil includes a first tab protruding from an edge of the first metal foil toward an outside of the first metal foil,
the second metal foil includes a second tab protruding from an edge of the second metal foil toward an outside of the second metal foil, and
the first tab and the second tab are directed toward a same direction within the electric storage device.

4. The stacked type electric storage device according to claim 1 , wherein
the first electrode includes a sheet-like first metal foil,
the second electrode includes a sheet-like second metal foil,
the first metal foil includes a first tab protruding from an edge of the first metal foil toward an outside of the first metal foil,
the second metal foil includes a second tab protruding from an edge of the second metal foil toward an outside of the second metal foil, and
the first tab and the second tab are directed toward a same direction within the electric storage device.

5. The stacked type electric storage device according to claim 1 , wherein the current interruption device comprises a flexible conductive diaphragm that contacts an electrical lead when a pressure inside the case is below a threshold value.

6. The stacked type electric storage device according to claim 1 , wherein there is no intervening structure between one end of the connection part and the current interruption device.

7. A lithium-ion secondary battery comprising: a case;
a sheet-like positive electrode disposed within the case;
a sheet-like negative electrode disposed within the case, wherein a polarity of the negative electrode is different from that of the positive electrode;
a separator insulating the positive electrode from the negative electrode;
a positive electrode terminal and a negative electrode terminal provided on the case;
a first conductive path from the positive electrode terminal to the positive electrode;
a second conductive path from the negative electrode terminal to the negative electrode; and
a current interruption device disposed between the negative electrode terminal and the negative electrode in the case, the current interruption device being configured to interrupt the second conductive path, wherein
one surface of the positive electrode faces one surface of the negative electrode,
the separator includes: a first surface part covering the one surface of the positive electrode, a second surface part covering the other surface of the positive electrode, and a connection part connected to both the first surface part and the second surface part,
the connection part is disposed between the current interruption device and an end of the positive electrode on a current interruption device side,
the connection part contacts a surface of the current interruption device, and
the negative electrode covers the positive electrode, and is larger than the positive electrode.

8. The stacked type electric storage device according to claim 7 , wherein the current interruption device comprises a flexible conductive diaphragm that contacts an electrical lead when a pressure inside the case is below a threshold value.

9. The stacked type electric storage device according to claim 7 , wherein there is no intervening structure between one end of the connection part and the current interruption device.

Assignees

• Toyota Jidoshokki Kk

Inventors

• MINAGATA Atsushi
• Okuda Motoaki
• Nishihara Hiroyasu
• Kato Takayuki

Classifications

• H01G11/66 Primary

  Current collectors · CPC title

• H01M50/567

  by fixing means, e.g. screws, rivets or bolts · CPC title

• H01M50/176

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

• H01M50/466

  U-shaped, bag-shaped or folded · CPC title

• H01M50/562

  characterised by the material · CPC title