Power storage device

Patent metadata

Field	Value
Publication number	US-2024194998-A1
Application number	US-202218285081-A
Country	US
Kind code	A1
Filing date	Mar 23, 2022
Priority date	Apr 30, 2021
Publication date	Jun 13, 2024
Grant date	—

Abstract

A power storage device includes a power storage module, a current collector plate, an insulating plate, and a restraint plate. The insulating plate and the restraint plate have different coefficients of thermal expansion. The insulating plate has a facing surface facing the restraint plate, and a first protruding portion provided on the facing surface in a position spaced from a center of the facing surface. The restraint plate is provided with a first hole portion into which the first protruding portion is inserted. The first protruding portion is divided into a first protrusion and a second protrusion in a second direction. The first protrusion is disposed closer to the center of the facing surface in the second direction. The second protrusion is disposed closer to an outer edge of the facing surface in the second direction.

First claim

1 . A power storage device comprising:
a power storage module; a current collector plate stacked on the power storage module in a first direction, and electrically connected to the power storage module; an insulating plate stacked on the current collector plate in the first direction; and a restraint plate stacked on the insulating plate in the first direction, and applying a restraint load on the power storage module, the current collector plate, and the insulating plate, wherein the insulating plate and the restraint plate have different coefficients of thermal expansion, wherein the insulating plate has a facing surface facing the restraint plate, and a first protruding portion provided on the facing surface in a position spaced from a center of the facing surface, wherein the restraint plate is provided with a first hole portion into which the first protruding portion is inserted, wherein the first protruding portion is divided into a first protrusion and a second protrusion in a second direction intersecting the first direction, wherein the first protrusion is disposed closer to the center of the facing surface in the second direction, and wherein the second protrusion is disposed closer to an outer edge of the facing surface in the second direction.

2 . The power storage device according to claim 1 ,
wherein the insulating plate is made of a resin, and has a coefficient of thermal expansion higher than a coefficient of thermal expansion of the restraint plate, and wherein the first protrusion abuts against an inner wall of the first hole portion.

3 . The power storage device according to claim 2 ,
wherein a rigidity of the first protrusion is lower than a rigidity of the second protrusion.

4 . The power storage device according to claim 1 ,
wherein the facing surface has a rectangular shape having a pair of shorts sides along the second direction, and a pair of long sides along a third direction intersecting the first direction and the second direction, and wherein the first hole portion is an elongated hole extending in the third direction.

5 . The power storage device according to claim 4 ,
wherein the first protruding portion is provided in a position spaced from the center of the facing surface in the second direction.

6 . The power storage device according to claim 4 or 5 ,
wherein a plurality of the first protruding portions are arranged along each of the pair of long sides.

7 . The power storage device according to claim 1 ,
wherein a thickness of the insulating plate is less than a height of the first protruding portion.

8 . The power storage device according to claim 1 ,
wherein each of the first protrusion and the second protrusion abuts against an inner wall of the first hole portion.

9 . The power storage device according to claim 1 ,
wherein the coefficient of thermal expansion of the insulating plate is greater than or equal to two times the coefficient of thermal expansion of the restraint plate.

10 . The power storage device according to claim 1 ,
wherein the first protruding portion is divided into the first protrusion and the second protrusion by a slit.

11 . The power storage device according to claim 1 ,
wherein each of the first protrusion and the second protrusion is divided into a pair of protrusion pieces in a third direction intersecting the first direction and the second direction.

12 . The power storage device according to claim 1 ,
wherein the insulating plate further has a second protruding portion provided on the facing surface closer to one end in the third direction than the first protruding portion, wherein the restraint plate is further provided with a second hole portion into which the second protruding portion is inserted, and wherein the second protruding portion is divided into a third protrusion and a fourth protrusion in the third direction.

13 . The power storage device according to claim 12 ,
wherein the third protrusion is disposed closer to the center of the facing surface than the fourth protrusion, and abuts against an inner wall of the second hole portion.

14 . The power storage device according to claim 13 ,
wherein a rigidity of the third protrusion is lower than a rigidity of the fourth protrusion.

15 . The power storage device according to claim 1 ,
wherein a plurality of the second protruding portions are arranged in the second direction.

Assignees

• Toyota Jidoshokki Kk
• Toyota Motor Co Ltd

Inventors

• Oide Ryuji
• Ueda Hiromi
• Kato Takeyuki
• Morioka Satoshi
• Okumura Motoyoshi

Classifications

• H01G11/72

  specially adapted for integration in multiple or stacked hybrid or EDL capacitors · CPC title

• H01G11/10

  Multiple hybrid or EDL capacitors, e.g. arrays or modules (housings, cases, encapsulations or mountings thereof H01G11/78) · CPC title

• H01M50/291

  characterised by their shape · CPC title

• H01M50/503

  characterised by the shape of the interconnectors · CPC title

• H01M50/258

  Modular batteries; Casings provided with means for assembling · CPC title