Power storage device

Patent metadata

Field	Value
Publication number	US-12080840-B2
Application number	US-202117389921-A
Country	US
Kind code	B2
Filing date	Jul 30, 2021
Priority date	Aug 25, 2020
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

The power storage device includes a power storage module and a conductive plate. The power storage module includes an electrode laminate including current collectors stacked on each other in a first direction. At least one of the positive electrode terminal electrode, the negative electrode terminal electrode, and the bipolar electrode includes an active material layer including grooves arranged in a second direction orthogonal to the first direction, and the grooves extend in a third direction crossing the second direction. The conductive plate includes an outer surface including depressions depressed in the first direction and extending in the second direction, the current collector arranged at the stack end of the electrode laminate includes an exposed face in contact with the outer surface, the exposed surface includes protrusions overlapping the active material layer in the first direction, and the protrusions protrude in the first direction and extend in the third direction.

First claim

What is claimed is:

1. A power storage device comprising:
a power storage module; and
a conductive plate stacked on the power storage module in a first direction,
wherein the power storage module and the conductive plate are configured to receive a restraint load along the first direction,
wherein the power storage module comprises:
an electrode laminate including current collectors laminated in the first direction; and
a sealing body provided to surround a side surface of the electrode laminate,

wherein the current collectors include:
a first current collector included in a negative terminal electrode;
a second current collector included in a positive terminal electrode; and
a third current collector included in a bipolar electrode provided between the negative terminal electrode and the positive terminal electrode,

wherein at least one of the positive terminal electrode, the negative terminal electrode, and the bipolar electrode includes an active material layer having grooves arranged in a second direction orthogonal to the first direction,
wherein each of grooves extends in a third direction intersecting the second direction when viewed from the first direction,
wherein the conductive plate includes an outer surface including depressions, the depressions being depressed in the first direction and extending in the second direction,
wherein a current collector disposed at a stacked end of the electrode laminate includes an exposed surface, the exposed surface being exposed from the sealing body and in contact with the outer surface of the conductive plate,
wherein the exposed surface includes protrusions overlapping the active material layer in the first direction, and
wherein the protrusions protrude in the first direction and extend in the third direction.

2. The power storage device according to claim 1 ,
wherein the conductive plate is an extrusion molded body of a conductive material, and
wherein the depressions include a recess provided in the outer surface and extending along an extrusion direction of the conductive material.

3. The power storage device according to claim 1 ,
wherein the conductive plate includes:
a first main plate portion including the outer surface;
a second main plate portion overlapping the first main plate portion in the first direction; and
partition portions extending from one end of the outer surface to the other end of the outer surface in the second direction, arranged in the third direction, and connecting the first main plate portion and the second main plate portion,

wherein through holes are provided by the first main plate portion, the second main plate portion, and the partition portions,
wherein each of the depressions:
do not overlap the partition portions in the first direction; and
include a flexure in the first main plate portion, the flexure being located between a couple of the partition portions adjacent to each other, and

wherein the flexure is bended toward the second main plate portion in the first direction.

4. The power storage device according to claim 1 ,
wherein the outer surface further includes a second recess provided on the outer surface, the second recess intersecting at least a part of the depressions,
wherein the conductive plate includes:
a first main plate portion including the outer surface;
a second main plate portion overlapping the first main plate portion in the first direction; and
partition portions extending from one end of the outer surface to the other end of the outer surface in the second direction, arranged in the third direction, and connecting the first main plate portion and the second main plate portion,

wherein through holes are provided by the first main plate portion, the second main plate portion, and the plurality of partition portions,
wherein each of the depressions:
do not overlap the partition portions in the first direction, and
include a flexure in the first main plate portion, the flexure being located between a couple of the partition portions adjacent to each other, and

wherein the flexure is bended toward the second main plate portion in the first direction.

5. The power storage device according to claim 3 , further comprising a second power storage module located on an opposite side of the power storage module with the conductive plate interposed therebetween in the first direction, the second power storage module being in contact with the second main plate portion,
wherein the through holes are exposed from a gap formed between the sealing body of the power storage module and a second sealing body included in the second power storage module in a second direction, and
wherein a diameter from one end of the through hole to the other end thereof in the first direction is equal to or larger than an interval of the gap in the first direction.

6. The power storage device according to claim 4 , further comprising a second power storage module located on an opposite side of the power storage module with the conductive plate interposed therebetween in the first direction, the second power storage module being in contact with the second main plate portion,
wherein the through holes are exposed from a gap formed between the sealing body of the power storage module and a second sealing body included in the second power storage module in a second direction, and
wherein a diameter from one end of the through hole to the other end thereof in the first direction is equal to or larger than an interval of the gap in the first direction.

7. The power storage device according to claim 1 , wherein the exposed surface is a roughened surface.

8. The power storage device according to claim 1 , wherein the current collector including the exposed surface is the first current collector or the second current collector.

9. A power storage device comprising:
a power storage module; and
a conductive plate stacked on the power storage module in a first direction,
wherein the power storage module comprises an electrode laminate including a negative terminal electrode, a bipolar electrode, a positive terminal electrode and a current collector laminated in order in the first direction,
wherein at least one of the positive terminal electrode, the negative terminal electrode, and the bipolar electrode includes an active material layer having grooves arranged in a second direction orthogonal to the first direction,
wherein each of grooves extends in a third direction intersecting the second direction when viewed from the first direction,
wherein the conductive plate includes an outer surface including depressions, the depressions being depressed in the first direction and extending in the second direction,
wherein the current collector includes an exposed surface in contact with the outer surface of the conductive plate,
wherein the exposed surface includes protrusions overlapping the active material layer in the first direction, and
wherein the protrusions protrude in the first direction and extend in the third direction.

10. The power storage device according to claim 9 ,
wherein the conductive plate is an extrusion molded body of a conductive material, and
wherein the depressions include a recess provided in the outer surface and extending along an extrusion direction of the conductive material.

11. The power storage device according to claim 9 ,
wherein the conductive plate includes:
a first main plate portion including the outer surface;
a second main plate portion overlapping the first main plate portion in the first direction; and
partition portions extending from one end of the outer surface to the other end of the outer surface in the s

Assignees

• Toyota Jidoshokki Kk
• Toyota Motor Co Ltd

Inventors

• Hamaoka Satoshi
• Inoue Taku
• Iida Junichi
• Oide Ryuji
• Morioka Satoshi
• Okumura Motoyoshi

Classifications

• H01M50/183

  Sealing members · CPC title

• H01M2004/029

  Bipolar electrodes · CPC title

• H01M10/0481

  Compression means other than compression means for stacks of electrodes and separators · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M4/02

  Electrodes composed of, or comprising, active material · CPC title