Power storage device

Patent metadata

Field	Value
Publication number	US-12444795-B2
Application number	US-201917415299-A
Country	US
Kind code	B2
Filing date	Dec 20, 2019
Priority date	Dec 25, 2018
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A power storage device includes a plurality of power storage modules laminated in a first direction via a conductive plate. A plurality of power storage modules include a plurality of laminates including each of the plurality of laminated electrodes, and a sealed body provided on each side surface of a plurality of laminates. The plurality of laminates are restrained in the first direction by a restraining member in a state of being laminated via the conductive plate. The sealed body includes a main body portion covering each side surface of the plurality of laminates, protruding portions protruding in the width direction intersecting the first direction with end portions of the main body portion as base ends, and at least one deformation suppressing portion protruding from the protruding portion in the first direction and forming a protruding shape.

First claim

The invention claimed is:

1. A power storage device comprising:
a plurality of power storage modules laminated in a first direction via a conductive plate, so that the conductive plate and the plurality of power storage modules overlap each other as viewed from the first direction, and wherein the conductive plate includes a through hole formed in a second direction intersecting the first direction, and the through hole is a cooling flow path through which cooling fluid passes,
wherein each of the plurality of power storage modules includes
a laminate including a plurality of bipolar electrodes laminated in the first direction, and a first terminal electrode and a second terminal electrode that are located at opposing ends of the laminate in the first direction,

each of the bipolar electrodes includes:
an electrode plate, a positive electrode provided on a first surface of the electrode plate, and a negative electrode provided on a second surface, opposite from the first surface, of the electrode plate,

wherein the first terminal electrode includes a first surface that faces the bipolar electrodes and a second surface that faces and connects to the conductive plate; and
a sealed body provided on a side surface of the laminate extending in the first direction,
the laminate has an electrode exposure portion exposed from the sealed body, wherein the electrode exposure portion is formed on the second surface of the first terminal electrode,

in a state of the plurality of power storage modules being laminated by disposing the conductive plate on the electrode exposure portion:
the laminate and the conductive plate are restrained in the first direction by a restraining member, and the conductive plate is smaller than the laminate as viewed from the first direction so that the conductive plate does not protrude from an outer periphery of the laminate as viewed from the first direction,
the conductive plate and the electrode exposure portion are located inside the sealed body as viewed from the first direction, and
the conductive plate, the positive electrode, and the negative electrode overlap each other as viewed from the first direction,

the sealed body includes
a main body portion covering the side surface of the laminate;
protruding portions protruding in a width direction intersecting the first direction with end portions of the main body portion in the first direction as base ends and covering peripheral edges of an upper surface and a bottom surface of the laminate; and
a plurality of deformation suppressing portions protruding from the protruding portions in the first direction, wherein the plurality of deformation suppressing portions are disposed apart from each other.

2. The power storage device according to claim 1 ,
at least one of the plurality of deformation suppressing portions is formed from one end to the other end of one of the protruding portions in the width direction.

3. The power storage device according to claim 1 ,
at least one of the plurality of deformation suppressing portions is formed on a distal end side of one of the protruding portions in the width direction.

4. The power storage device according to claim 1 , wherein
the protruding portions have a rectangular frame shape when viewed from the first direction, and
on at least one side of the protruding portions constituting the rectangular frame shape, the plurality of deformation suppressing portions are disposed apart from each other in a direction along the side.

5. The power storage device according to claim 1 , wherein
the sealed body includes other deformation suppressing portions protruding from the protruding portions in the first direction,
the other deformation suppressing portions are continuously formed from one end side to the other end side in the second direction on a side of the protruding portions extending along the second direction, and
the plurality of the deformation suppressing portions are disposed apart from each other in a third direction intersecting the first direction and the second direction on a side of the protruding portions extending along the third direction.

6. The power storage device according to claim 1 , wherein
when at least one of a plurality of the laminates is expanded by use, at least one of the plurality of deformation suppressing portions of the at least one of the expanded laminates abuts on the protruding portion of the sealed body adjacent in the first direction, and
when none of the plurality of laminates is expanded by use, none of the plurality of deformation suppressing portions abuts on the protruding portion of the sealed body adjacent in the first direction.

7. A power storage device comprising:
a plurality of power storage modules laminated in a first direction via a conductive plate, so that the conductive plate and the plurality of power storage modules overlap each other as viewed from the first direction, and wherein the conductive plate includes a through hole formed in a second direction intersecting the first direction, and the through hole is a cooling flow path through which cooling fluid passes,
wherein each of the plurality of power storage modules includes
a laminate including a plurality of bipolar electrodes laminated in the first direction, and first terminal electrode and a second terminal electrode that are located at opposing ends of the laminate in the first direction,

each of the bipolar electrodes includes:
an electrode plate, a positive electrode provided on a first surface of the electrode plate, and a negative electrode provided on a second surface, opposite from the first surface, of the electrode plate,

the first terminal electrode includes a first surface that faces the bipolar electrodes and a second surface that faces and connects to the conductive plate; and
a sealed body provided on a side surface of the laminate extending in the first direction,
the laminate has an electrode exposure portion exposed from the sealed body, wherein the electrode exposure portion is formed on the second surface of the first terminal electrode,
in a state of the plurality of power storage modules being laminated by disposing the conductive plate on the electrode exposure portion:
the laminate and the conductive plate are restrained in the first direction by a restraining member, and the conductive plate is smaller than the laminate as viewed from the first direction so that the conductive plate does not protrude from an outer periphery of the laminate as viewed from the first direction,
the conductive plate and the electrode exposure portion are located inside the sealed body as viewed from the first direction, and
the conductive plate, the positive electrode, and the negative electrode overlap each other as viewed from the first direction,

the sealed body includes
a main body portion covering the side surface of the laminate;
protruding portions protruding in a width direction intersecting the first direction with end portions of the main body portion in the first direction as base ends and covering peripheral edges of an upper surface and a bottom surface of the laminate; and
at least one deformation suppressing portion protruding from at least one of the protruding portions in the first direction, wherein the at least one deformation suppressing portion is formed on a distal end side of the at least one of the protruding portions in the width direction.

Assignees

• Toyota Jidoshokki Kk
• Toyota Motor Co Ltd

Inventors

• Yamada Masahiro
• Ueda Hiromi
• Morioka Satoshi
• Okumura Motoyoshi
• Kikuchi Takuro

Classifications

• H01M50/227

  Organic material · CPC title

• H01M50/50

  Current conducting connections for cells or batteries · CPC title

• H01G11/80

  Gaskets; Sealings · CPC title

• H01G11/12

  Stacked hybrid or EDL capacitors · CPC title

• H01M50/176

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