Power storage module

Patent metadata

Field	Value
Publication number	US-11695181-B2
Application number	US-201917043941-A
Country	US
Kind code	B2
Filing date	Apr 4, 2019
Priority date	Apr 5, 2018
Publication date	Jul 4, 2023
Grant date	Jul 4, 2023

Abstract

A power storage module including: a stacked body that includes electrodes stacked along a first direction; a sealing body that includes a first sealing portion joined to an edge portion of each of the electrodes, forms an inner space between the electrodes adjacent to each other, and seals the inner space; and an electrolytic solution that is stored in the inner space and includes an alkali solution. The electrodes include bipolar electrodes, and a negative terminal electrode. The power storage module includes surplus spaces different from the inner space on a route of an alkali creep phenomenon in which the electrolytic solution reaches the outside from the inner space through the negative terminal electrode.

First claim

The invention claimed is:

1. A power storage module, comprising:
a stacked body including a plurality of electrodes stacked along a first direction;
a sealing body including a first sealing portion joined to an edge portion of each of the electrodes, and forming an inner space between the electrodes adjacent to each other and sealing the inner space; and
an electrolytic solution being stored in the inner space and including an alkali solution,
wherein the electrodes include a plurality of bipolar electrodes, and a negative terminal electrode,
the bipolar electrodes include an electrode plate including a first surface and a second surface opposite to the first surface, a positive electrode provided on the first surface, and a negative electrode provided on the second surface,
the negative terminal electrode includes an electrode plate including a third surface and a fourth surface opposite to the third surface, and a negative electrode provided on the fourth surface, and is disposed at one end of the stacked body in the first direction so that the fourth surface of the electrode plate of the negative terminal electrode faces the first surface of the electrode plate of the bipolar electrode,
a surplus space different from the inner space is provided on a route in which the electrolytic solution reaches an outside of the power storage module from the inner space through the negative terminal electrode,
the stacked body includes a metal plate disposed on an outer side in the first direction with respect to the electrode plate of the negative terminal electrode, wherein an inner surface of the metal plate faces the third surface of the electrode plate of the negative terminal electrode, and wherein an outer surface of the metal plate is opposite from the inner surface of the metal plate,
wherein the first sealing portion includes a second resin portion having an annular shape, the second resin portion being disposed at a peripheral edge portion of the outer surface of the metal plate so that a central region of the outer surface of the metal plate is not covered by the second resin portion, and the metal plate is welded to the second resin portion of the first sealing portion, and
the surplus space is formed by the first sealing portion, the electrode plate of the negative terminal electrode, and the metal plate, and has air-tightness with respect to the outside of the power storage module.

2. The power storage module according to claim 1 ,
wherein the first sealing portion includes a first resin portion welded to the third surface of the negative terminal electrode, and wherein the second resin portion extends from a peripheral edge portion of the first resin portion and the second resin is welded to the outer surface of the metal plate.

3. The power storage module according to claim 2 , further comprising:
a second sealing portion being joined to a plurality of the first sealing portions so as to surround an outer side of the first resin portions and the second resin portions of the first sealing portions,
wherein the second sealing portion includes an overlapping portion overlapping the metal plate and the second resin portion when viewed from the first direction, and is welded to the second resin portion at the overlapping portion.

4. The power storage module according to claim 2 ,
wherein the metal plate includes a frame-shaped to-be-welded portion welded to the first resin portion, and a to-be-contact portion located closer to the third surface of the negative terminal electrode in comparison to the to-be-welded portion on an inner side of the to-be-welded portion and being in contact with the third surface.

5. The power storage module according to claim 2 ,
wherein regions welded to the sealing body located on the third surface, the fifth surface, and the sixth surface are roughened.

6. The power storage module according to claim 2 ,
wherein a material that forms the metal plate is the same as a material that forms the electrode plate, and
and an active material layer is not formed on the inner surface and the outer surface of the metal plate.

7. The power storage module according to claim 1 ,
wherein the central region of the outer surface of the metal plate faces an outside of the power storage module.

8. A power storage device, comprising:
a power storage module;
a conductive plate disposed adjacent to the power storage module;
the power storage module comprising:
a stacked body including a plurality of electrodes stacked along a first direction;
a metal plate being provided in one end of the stacked body in the first direction;
a sealing body including a first sealing portion joined to the electrodes, and forming an inner space between the electrodes adjacent to each other and sealing the inner space; and
an electrolytic solution being stored in the inner space and including an alkali solution,
wherein the electrodes include a plurality of bipolar electrodes, and a negative terminal electrode,
the first sealing portion includes a first resin portion disposed between the negative terminal electrode and the metal plate,
one surface of the first resin portion in the first direction is joined to the negative terminal electrode,
another surface of the first resin portion in the first direction is joined to the metal plate, and
the metal plate includes an inner surface facing the negative terminal electrode and an outer surface facing away from the negative terminal electrode, and the inner surface includes (i) a frame-shaped to-be-welded portion which is welded to the another surface of the first resin portion and (ii) a to-be-contact portion which is in contact with the negative terminal electrode, and
wherein
the conductive plate is located on and is in contact with a region of the outer surface of the metal plate that is opposite from the to-be-contact portion of the inner surface of the metal plate.

9. The power storage module according to claim 8 ,
wherein the bipolar electrodes include an electrode plate including a first surface and a second surface opposite to the first surface, a positive electrode provided on the first surface, and a negative electrode provided on the second surface,
the negative terminal electrode includes an electrode plate including a third surface and a fourth surface opposite to the third surface, and a negative electrode provided on the fourth surface, and is disposed between the bipolar electrodes and the metal plate at the one end of the stacked body in the first direction so that the fourth surface of the electrode plate of the negative terminal electrode faces the first surface of the electrode plate of the bipolar electrodes, and
the inner surface of the metal plate faces the third surface of the negative terminal electrode, and the outer surface of the metal plate is opposite to the inner surface of the metal plate, and the metal plate is welded to the first resin portion at a peripheral edge portion of the inner surface.

10. The power storage module according to claim 9 , wherein:
the first sealing portion further includes a second resin portion that is welded to the first resin portion,
the second resin portion covers an outer peripheral portion of the outer surface of the metal plate and a central region of the outer surface of the metal plate is not covered with the second resin portion, and
the central region of the second resin portion of the metal plate is in contact with the conductive plate.

Assignees

• Toyota Jidoshokki Kk
• Toyota Motor Co Ltd

Inventors

• Nakamura Tomohiro
• CHUJO Yuki
• Yamada Masahiro
• Hirose Takayuki
• Haga Nobuyasu
• Okumura Motoyoshi
• Kikuchi Takuro

Classifications

• H01M2004/029

  Bipolar electrodes · CPC title

• H01M10/282

  with bipolar electrodes · CPC title

• H01G11/78

  Cases; Housings; Encapsulations; Mountings · CPC title

• H01G11/80

  Gaskets; Sealings · CPC title

• H01M50/77

  with external circulating path · CPC title