Electric storage device including current interruption device

Patent metadata

Field	Value
Publication number	US-9543563-B2
Application number	US-201314415400-A
Country	US
Kind code	B2
Filing date	Jul 17, 2013
Priority date	Jul 19, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

An electric storage device comprises the current interruption device which includes a deformable plate electrically connected to a first conductive member and a second conductive member to constitute part of a conductive path. The deformable plate deforms to interrupt the conductive path, when a pressure inside the casing rises. The first conductive member, the second conductive member, and the current interruption device are disposed between the terminal attachment wall and the electrode assembly. The first conductive member extends along the terminal attachment wall to connect the tab and the current interruption device. The second conductive member is connected to the current interruption device at a location that is farther from the terminal attachment wall than a connection between the first conductive member and the current interruption device, and extends along the terminal attachment wall to connect the current interruption device and the electrode terminal.

First claim

The invention claimed is:

1. An electric storage device comprising:
a casing;
an electrode assembly accommodated within the casing, the electrode assembly including a positive electrode and a negative electrode;
an electrode terminal provided on a terminal attachment wall of the casing;
a first conductive member accommodated within the casing and electrically connected to the electrode assembly;
a second conductive member accommodated within the casing and electrically connected to the electrode terminal; and
a current interruption device accommodated within the casing, connected in series between the first conductive member and the second conductive member, and configured to connect or interrupt a conductive path from the electrode assembly to the electrode terminal, wherein
the electrode assembly comprises a tab protruding from at least one of the positive electrode and the negative electrode toward the terminal attachment wall,
the current interruption device includes a deformable plate electrically connected to the first conductive member and the second conductive member to constitute part of the conductive path,
the deformable plate comprises a joint part that forms a joint with a joint receiving member to connect the conductive path, the deformable plate being configured to, when a pressure inside the casing rises, deform to be separated from the joint receiving member to interrupt the conductive path, the joint receiving member being either the first conductive member or the second conductive member,
the first conductive member, the second conductive member, and the current interruption device are disposed between the terminal attachment wall and the electrode assembly,
the first conductive member extends along the terminal attachment wall to connect the tab and the current interruption device, and
the second conductive member is connected to the current interruption device at a location that is farther from the terminal attachment wall than a connection between the first conductive member and the current interruption device, and extends along the terminal attachment wall to connect the current interruption device and the electrode terminal.

2. The electric storage device according to claim 1 , wherein
the tab and the current interruption device at least partially overlap each other in a direction in which the first conductive member extends.

3. The electric storage device according to claim 1 , wherein
the first conductive member linearly extends along the terminal attachment wall.

4. The electric storage device according to claim 1 , wherein
the second conductive member linearly extends along the terminal attachment wall.

5. The electric storage device according to claim 1 , wherein
the joint receiving member comprises an engraved portion in an area around a part thereof that forms a joint with the joint part, and
when the deformable plate deforms, the joint receiving member breaks at the engraved portion.

6. The electric storage device according to claim 1 , wherein
the deformable plate is an invertible plate.

7. The electric storage device according to claim 1 , wherein
the terminal attachment wall is provided with a plate-like insulating member that is in contact with an inner surface of the terminal attachment wall in parallel to the inner surface.

8. The electric storage device according to claim 1 , wherein
the tab is bent in a direction substantially parallel to the terminal attachment wall so that a flat part that is substantially parallel to the terminal attachment wall is formed, and
the first conductive member is joined to a surface of the flat part that faces the terminal attachment wall.

9. The electric storage device according to claim 1 , wherein
the first conductive member and the second conductive member extend in opposite directions to each other.

10. The electric storage device according to claim 1 , wherein
the electric storage device is a secondary battery.

Assignees

• MINAGATA Atsushi
• Okuda Motoaki
• Nishihara Hiroyasu
• Toyota Jidoshokki Kk

Inventors

• MINAGATA Atsushi
• Okuda Motoaki
• Nishihara Hiroyasu

Classifications

• H01M2/345 Primary

  Electricity · mapped topic

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M2/22

  Electricity · mapped topic

• H01M50/578 Primary

  in response to pressure · CPC title

• H01M50/528 Primary

  Fixed electrical connections, i.e. not intended for disconnection · CPC title