Electric storage device comprising current interruption device

Patent metadata

Field	Value
Publication number	US-2016308190-A1
Application number	US-201415101576-A
Country	US
Kind code	A1
Filing date	Nov 28, 2014
Priority date	Dec 13, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

An electric storage device disclosed in the present application includes a casing, a first electrode terminal and a second electrode terminal that are provided on a terminal attachment wall of the casing, and an electrode assembly, a first conductive member, a second conductive member, and a current interruption device that are disposed within the casing. The first conductive member and the second conductive member connected respectively to a positive electrode or a negative electrode of the electrode assembly. The current interruption device is arranged between the terminal attachment wall and the electrode assembly, connected in series between the first electrode terminal and the first conductive member, and configured to connect or interrupt a conductive path from the electrode assembly to the first electrode terminal. A first spacer is further provided between the current interruption device and the electrode assembly, the first spacer being in contact with the electrode assembly.

First claim

1 . An electric storage device comprising:
a casing including a terminal attachment wall; an electrode assembly disposed within the casing and comprising a positive electrode and a negative electrode; a first electrode terminal and a second electrode terminal that are provided on the terminal attachment wall which is one of a plurality of walls that configures the casing; a first conductive member disposed within the casing and electrically connected to one of the positive electrode and the negative electrode; a second conductive member disposed within the casing and electrically connected to both the positive electrode assembly and the second electrode terminal; a current interruption device arranged between the terminal attachment wall and the electrode assembly, disposed within the casing, connected in series between the first electrode terminal and the first conductive member, and configured to connect or interrupt a conductive path from the electrode assembly to the first electrode terminal, and a first spacer arranged between the current interruption device and the electrode assembly.

2 . The electric storage device according to claim 1 , wherein
the first spacer is fixed to the current interruption device.

3 . The electric storage device according to claim 1 , wherein
the first spacer comprises a surface which makes contact with the electrode assembly, the surface having a shape corresponding to a shape of a surface of the electrode assembly on a first spacer side.

4 . The electric storage device according to claim 1 , further comprising a second spacer arranged between the second electrode terminal and the electrode assembly, the second spacer being in contact with the electrode assembly.

5 . The electric storage device according to claim 4 , wherein
the second spacer is fixed to the second electrode terminal.

6 . The electric storage device according to claim 1 , wherein
the second spacer comprises a surface which makes contact with the electrode assembly, the surface having a shape corresponding to a shape of a surface of the electrode assembly on a second spacer side.

7 . The electric storage device according to claim 1 , further comprising a shock-absorber arranged between the electrode assembly and a wall surface opposed to the terminal attachment wall of the plurality of the walls that configures the casing.

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

9 . The electric storage device according to claim 1 , wherein
the current interruption device comprises a deforming plate including a pressure receiving part configured to receive pressure inside the casing, and is configured to interrupt the conductive path when the pressure inside the casing that is acting on the pressure receiving part increases and the deforming plate is deformed, and a through-hole is provided in the first spacer, and the pressure inside the casing acts on the pressure receiving part of the deforming plate via the through-hole.

10 . The electric storage device according to claim 9 , wherein
in a plan view of the current interruption device and the first spacer, the pressure receiving part of the deforming plate and the through-hole of the first spacer overlap.

11 . The electric storage device according to claim 1 , wherein
the current interruption device comprises a deforming plate configured to receive pressure inside the casing and a support supporting the deforming plate, and is configured to interrupt the conductive path when the pressure inside the casing that is acting on the deforming plate increases and the deforming plate is deformed, and in a plan view of the deforming plate and the first spacer, a position of an outer peripheral edge of the first spacer is located on an inner side than a position of an outer peripheral edge of the deforming plate.

12 . The electric storage device according to claim 11 , wherein
in the plan view of the deforming plate and the first spacer, the position of the outer peripheral edge of the first spacer matches with or is located on an outer side than, within a part of the deforming plate that is opposed to the electrode assembly, a position of a part of the deforming plate that is not supported by the support.

13 . The electric storage device according to claim 11 , wherein
a through-hole is provided in the first spacer, and in a plan view of the current interruption device and the first spacer, the through-hole of the first spacer is located in a central part of the deforming plate.

14 . The electric storage device according to claim 1 , wherein
the electrode assembly further comprises a pair of electrodes in which a positive-electrode sheet, a separator and a negative-electrode sheet are laminated, a positive-electrode current collector connected to the positive-electrode sheet of the pair of electrodes, and a negative-electrode current collector connected to the negative-electrode sheet of the pair of electrodes, the first conductive member is connected to one of the positive-electrode current collector and the negative-electrode current collector, the second conductive member is connected to the other of the positive-electrode current collector and the negative-electrode current collector, the casing comprises a pair of opposed walls which are opposed to each other and extend from an outer peripheral edge of the terminal attachment wall to an electrode assembly side, the positive-electrode current collector protrudes from the pair of electrodes toward one of the pair of opposed walls, and the negative-electrode current collector protrudes from the pair of electrodes toward the other of the pair of opposed walls.

15 . The electric storage device according to claim 1 , wherein
the first spacer adheres to the current interruption device.

16 . The electric storage device according to claim 15 , wherein
a surface of the first spacer which makes contact with the electrode assembly has a shape corresponding to a shape of a surface of the electrode assembly on a first spacer side.

17 . The electric storage device according to claim 1 , wherein
the electrode assembly comprises a pair of electrodes in which a positive-electrode sheet, a separator and a negative-electrode sheet, and the pair of electrodes is wound around a winding axis which is parallel to the terminal attachment wall, and a surface of the first spacer on an electrode assembly side has a concave R-shape corresponding to a shape of a surface of the electrode assembly on a first spacer side.

18 . The electric storage device according to claim 1 , wherein
a through-hole passing from a surface of the first spacer on an electrode assembly side to a surface of the first spacer on a current interruption device side is provided in the first spacer.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Okuda Motoaki
• Hirose Takayuki
• Nishihara Hiroyasu

Classifications

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01G9/008

  Terminals · CPC title

• H01M10/0431

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M2/14

  Electricity · mapped topic

• H01G9/08

  Housing; Encapsulation · CPC title