Power storage device

Patent metadata

Field	Value
Publication number	US-11837740-B2
Application number	US-202017123136-A
Country	US
Kind code	B2
Filing date	Dec 16, 2020
Priority date	Dec 23, 2019
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

A power storage device comprises: a cell group in which a plurality of battery cells each having a terminal on a first surface are stacked; a cylindrical housing part that houses the cell group; a first plate member extending from the first surface of each of the battery cells in the cell group to side surfaces of each of the battery cells, the side surfaces being adjacent to the first surface, the first plate member being housed in the housing part together with the cell group; a cell side protrusion portion protruding from a portion extending on each of the side surfaces of each of the battery cells toward an inner wall surface of the housing part in the first plate member; and an insertion member that is press-fitted to contact both of the cell side protrusion portion and the inner wall surface disposed closer to the first surface side than the cell side protrusion portion, and presses the cell group against an opposite side of a side facing the first surface via the cell side protrusion portion.

First claim

What is claimed is:

1. A power storage device comprising:
a cell group in which a plurality of battery cells each having a terminal on a first surface are stacked;
a cylindrical housing part that houses the cell group and includes an upper wall portion, a lower wall portion, and two side wall portions that respectively cover the first surface, a surface opposite to the first surface, and a side surface adjacent to the first surface of a respective one of the battery cells in the cell group;
a first plate member extending from the first surface of each of the battery cells in the cell group to side surfaces of each of the battery cells, the side surfaces being adjacent to the first surface, the first plate member being housed in the housing part together with the cell group;
a cell side protrusion portion protruding from a portion extending on each of the side surfaces of each of the battery cells toward an inner wall surface of the housing part in the first plate member;
an insertion member that has a bar-shaped body having a length extending an entire length of the cell group in a length direction, and is press-fitted from an opening that is open at an end of the housing part to contact both of the cell side protrusion portion and the inner wall surface disposed closer to the first surface side than the cell side protrusion portion;
wherein the cell side protrusion portion has a receiving surface arranged to face the upper wall portion side and the outward in the width direction of the cell group and receives a pressing force from the insertion member; and
wherein the insertion member presses the cell group in a diagonal direction of the battery cells against a contact point with the receiving surface via the receiving surface of the cell side protrusion portion.

2. The power storage device according to claim 1 , wherein an elastic member that receives a load from the cell group pressed by the insertion member is provided between the cell group and the inner wall surface of the housing part.

3. The power storage device according to claim 2 , wherein the elastic member is disposed in a corner portion at a diagonal position of the insertion member via the cell group.

4. The power storage device according to claim 2 comprising:
a second plate member disposed to cover a second surface side of each of the battery cells disposed at an opposite side of the first surface in the cell group, the second plate member being housed in the housing part together with the cell group,
wherein the elastic member is provided in the second plate member.

5. The power storage device according to claim 4 , wherein the second plate member includes a pair of side frame portions extending at both ends along a length direction of a lower surface of the cell group,
the elastic member is held between upper claw portions and lower claw portions that are alternately disposed on an upper side and a lower side of each of the pair of side frame portions along the length direction, and
each of the upper claw portions includes a contact portion that contacts the side surface of the battery cell.

6. The power storage device according to claim 1 , wherein the cell side protrusion portion is disposed in the first plate member on each of both side surface sides of the battery cell.

7. The power storage device according to claim 1 , wherein a contact recess portion having an inner surface sandwiching the insertion member between the contact recess portion and the cell side protrusion portion is provided in the inner wall surface of the housing part disposed closer to the first surface side than the cell side protrusion portion.

8. The power storage device according to claim 7 , wherein an inner wall side protrusion portion protruding toward the cell group side is provided in the inner wall surface of the housing part facing the cell side protrusion portion, and
the inner wall side protrusion portion is disposed on an opposite side of the cell side protrusion portion via the insertion member, and at least a part of the inner wall side protrusion portion overlaps with the cell side protrusion portion as viewed from a side facing the first surface.

9. A power storage device comprising:
a cell group in which a plurality of battery cells each having a terminal on a first surface are stacked;
a cylindrical housing part that houses the cell group and includes an upper wall portion, a lower wall portion, and two side wall portions;
a first plate member extending from the first surface of each of the battery cells in the cell group to side surfaces of each of the battery cells, the side surfaces being adjacent to the first surface, the first plate member being housed in the housing part together with the cell group;
a cell side protrusion portion protruding from a portion extending on each of the side surfaces of each of the battery cells toward an inner wall surface of the housing part in the first plate member; and
an insertion member that has a bar-shaped body having a length extending an entire length of the cell group in a length direction, and is press-fitted from an opening that is open at an end of the housing part to contact both of the cell side protrusion portion and the inner wall surface disposed closer to the first surface side than the cell side protrusion portion, and to press the cell group against an opposite side of a side facing the first surface via the cell side protrusion portion,
wherein an elastic member that receives a load from the cell group pressed by the insertion member is provided between the cell group and the inner wall surface of the housing part,
the power storage device further comprising:
a second plate member disposed to cover a second surface side of each of the battery cells disposed at an opposite side of the first surface in the cell group, the second plate member being housed in the housing part together with the cell group,
wherein the elastic member is provided in the second plate member,
wherein the second plate member includes a pair of side frame portions extending at both ends along a length direction of a lower surface of the cell group,
the elastic member is held between upper claw portions and lower claw portions that are alternately disposed on an upper side and a lower side of each of the pair of side frame portions along the length direction, and
each of the upper claw portions includes a contact portion that contacts the side surface of a respective one of the battery cells.

10. A power storage device comprising:
a cell group in which a plurality of battery cells each having a terminal on a first surface are stacked;
a cylindrical housing part that houses the cell group and includes an upper wall portion, a lower wall portion, and two side wall portions;
a first plate member extending from the first surface of each of the battery cells in the cell group to side surfaces of each of the battery cells, the side surfaces being adjacent to the first surface, the first plate member being housed in the housing part together with the cell group;
a cell side protrusion portion protruding from a portion extending on each of the side surfaces of each of the battery cells toward an inner wall surface of the housing part in the first plate member; and
an insertion member that has a bar-shaped body having a length extending an entire length of the cell group in a length direction, and is press-fitted from an opening that is open at an end of the housing part to contact both of the cell side protrusion portion and the inner wall surface disposed closer to the first surface side than the cell side protrusion portion, and to press the cell group against an opposite side of a side facing the first sur

Assignees

• Honda Motor Co Ltd

Inventors

• Miyoshi Kyosuke
• Hidaka Shoshi

Classifications

• H01M50/209 Primary

  adapted for prismatic or rectangular cells (H01M50/216 takes precedence) · CPC title

• H01M10/0481

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

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/244

  Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method · CPC title

• H01M50/249

  specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64) · CPC title