Power storage module

Patent metadata

Field	Value
Publication number	US-11699557-B2
Application number	US-201816754528-A
Country	US
Kind code	B2
Filing date	Sep 25, 2018
Priority date	Oct 11, 2017
Publication date	Jul 11, 2023
Grant date	Jul 11, 2023

Abstract

An electricity-storage module includes an electrode stacked body and a sealing body. A negative terminal electrode is disposed at one end of the electrode stacked body in a stacking direction such that a second surface is an inner side of the electrode stacked body. The sealing body includes first resin portions 21 which are joined to edge portions, and a second resin portion that is joined to the first resin portions 21 so as to surround the first resin portions from an outer side.

First claim

The invention claimed is:

1. An electricity-storage module comprising:
a stacked body that includes a plurality of electrodes which are stacked along a first direction; and
a sealing body that is provided to the stacked body so as to surround a plurality of edge portions of the plurality of electrodes,
wherein the plurality of electrodes include a plurality of bipolar electrodes, a negative terminal electrode, and a positive terminal electrode,
wherein each of the plurality of bipolar electrodes includes a first electrode plate, a first positive electrode provided on a first surface of the first electrode plate, and a first negative electrode provided on a second surface of the first electrode plate which is opposite to the first surface of the first electrode plate,
wherein the negative terminal electrode includes a second electrode plate and a second negative electrode provided on a second surface of the second electrode plate, and is disposed at one end of the stacked body in the first direction such that the second surface of the second electrode plate is a first inner side of the stacked body,
wherein the positive terminal electrode includes a third electrode plate and a second positive electrode provided on a first surface of the third electrode plate, and is disposed at an other end of the stacked body in the first direction such that the first surface of the third electrode plate is a second inner side of the stacked body,
wherein the sealing body includes a plurality of first sealing portions which are joined to the plurality of edge portions of the plurality of electrodes, and a second sealing portion that is joined to each of the plurality of first sealing portions so as to surround the plurality of first sealing portions from an outer side,
wherein the second sealing portion includes a first overlapping portion that is provided on a third sealing portion of the plurality of first sealing portions at the one end of the stacked body so as to overlap the third sealing portion which is joined to an edge portion of the negative terminal electrode, the edge portion of the negative terminal electrode being of the plurality of edge portions, and
wherein the first overlapping portion includes a regulation portion configured to regulate deformation of the third sealing portion along the first direction;
wherein the third sealing portion includes a first surface of the third sealing portion and a second surface of the third sealing portion, the second surface of the third sealing portion being opposite to the first surface of the third sealing portion in the first direction;
wherein the second surface of the third sealing portion connects to a first surface of the second electrode plate, the first surface of the second electrode plate being opposite to the second surface of the second electrode plate in the first direction;
wherein at least some of the first surface of third sealing portion is welded to the first overlapping portion.

2. The electricity-storage module according to claim 1 ,
wherein the second sealing portion includes a second overlapping portion provided on a fourth sealing portion of the plurality of first sealing portions so as to overlap the fourth sealing portion which is joined to an edge portion of the positive terminal electrode at the other end of the stacked body, the edge portion of the positive terminal electrode being of the plurality of edge portions, and
wherein the first overlapping portion includes a portion of which the thickness along the first direction is larger than the thickness of the second overlapping portion as the regulation portion.

3. The electricity-storage module according to claim 1 ,
wherein the thickness of the first overlapping portion along the first direction is equal to or greater than 300 μm and equal to or less than 3 mm.

4. The electricity-storage module according to claim 1 , further comprising:
a constraining member including a pair of end plates between which the stacked body is interposed in the first direction and, is configured to apply a constraining load to the stacked body along the first direction,
wherein the thickness of the regulation portion along the first direction is two or more times the thickness of each of the plurality of first sealing portions along the first direction in a range in which an outer edge of the regulation portion in the first direction is located on a further inner side of the stacked body in comparison to an outer edge of the constraining member.

5. The electricity-storage module according to claim 1 ,
wherein the first overlapping portion includes a portion that extends toward the first inner side of the stacked body so as to further overlap the second electrode plate as the regulation portion.

6. The electricity-storage module according to claim 1 ,
wherein the first overlapping portion includes a first portion having a thickness equal to or larger than the thickness of the second sealing portion on a side surface that intersects the first direction of the stacked body as the regulation portion.

7. The electricity-storage module according to claim 6 ,
wherein the second sealing portion includes a second overlapping portion provided on a fourth sealing portion of the plurality of first sealing portions so as to overlap the fourth sealing portion which is joined to an edge portion of the positive terminal electrode at the other end of the stacked body, the edge portion of the positive terminal electrode being of the plurality of edge portions, and
wherein the second overlapping portion includes a second portion having a thickness equal to or greater than the thickness of the second sealing portion on a side surface of the stacked body which intersects the first direction.

8. The electricity-storage module according to claim 7 ,
wherein each of the plurality of first sealing portions includes an annular extension portion that extends respectively from each of the plurality of edge portions of the plurality of electrodes to an outer side of the plurality of electrodes when viewed from the first direction, and
wherein the first portion and the second portion are provided in an annular shape so as to cover the extension portion when viewed from the first direction.

9. The electricity-storage module according to claim 1 ,
wherein the regulation portion in the first direction is of larger thickness than the third sealing portion in the first direction.

10. The electricity-storage module according to claim 9 ,
wherein the regulation portion in the first direction is of larger thickness than the third sealing portion in the first direction by a factor of at least two.

11. The electricity-storage module according to claim 1 ,
wherein the plurality of first sealing portions and the second sealing portion is made of a non-electrically conductive material.

12. The electricity-storage module according to claim 11 ,
wherein the non-electrically conductive material is resin.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Nakamura Tomohiro
• CHUJO Yuki
• Yamada Masahiro
• Hirose Takayuki

Classifications

• H01G11/80

  Gaskets; Sealings · CPC title

• H01M50/543

  Terminals · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/193

  Organic material · CPC title

• H01M2004/029

  Bipolar electrodes · CPC title