Power storage device

Patent metadata

Field	Value
Publication number	US-2021376421-A1
Application number	US-202117325852-A
Country	US
Kind code	A1
Filing date	May 20, 2021
Priority date	Jun 2, 2020
Publication date	Dec 2, 2021
Grant date	—

Abstract

A power storage device includes a power storage stack and a housing case. In the power storage stack, a plurality of unit cells and a plurality of spacers are alternately stacked in a first direction. A first support surface of each spacer among the plurality of spacers is angled corresponding to and is in contact with a first tapered surface of the unit cell that is adjacent to the spacer in the first direction. A second support surface of each spacer among the plurality of spacers is angled corresponding to and is in contact with a second tapered surface of the unit cell that is adjacent to the spacer in the first direction. The plurality of spacers are each formed of a thermoplastic resin.

First claim

What is claimed is:

1 . A power storage device, comprising:
a power storage stack in which a plurality of unit cells and a plurality of spacers are alternately stacked along a first direction; and a housing case accommodating the power storage stack, wherein the power storage stack is constrained in the first direction within the housing case, each unit cell among the plurality of unit cells has a first tapered surface and a second tapered surface that are angled so that a spacing formed between the first tapered surface and the second tapered surface decreases toward one side of a second direction intersecting with the first direction, the first tapered surface and the second tapered surface forming opposing end surfaces of the unit cell in the first direction, each spacer among the plurality of spacers has a first support surface and a second support surface forming opposing end surfaces in the first direction, the first support surface of each spacer of the plurality of spacers is angled corresponding to and is in contact with the first tapered surface of the unit cell that is adjacent to the spacer on one side of the first direction, the second support surface of each spacer of the plurality of spacers is angled corresponding to and is in contact with the second tapered surface of the unit cell that is adjacent to the spacer on the other side of the first direction, and the plurality of spacers are each formed of a thermoplastic resin.

2 . The power storage device according to claim 1 , wherein
the power storage stack has a first end surface and a second end surface forming opposing end surfaces of the power storage stack in the first direction, the first end surface of the power storage stack is formed of the first tapered surface of the unit cell that is disposed on one end of the power storage stack in the first direction, the second end surface of the power storage stack is formed of the second tapered surface of the unit cell that is disposed on the other end of the power storage stack in the first direction, the housing case has a first inner surface and a second inner surface facing each other in the first direction, the first inner surface includes a first angled portion angled corresponding to the first tapered surface, the second inner surface includes a second angled portion angled corresponding to the second tapered surface, and the power storage stack is held by the housing case, with the first end surface in contact with the first angled portion and the second end surface in contact with the second angled portion.

3 . The power storage device according to claim 1 , further comprising:
a cooler for cooling the plurality of unit cells, the cooler being disposed between the bottom of the housing case and the power storage stack, wherein on the one side of the second direction, the bottom is facing the power storage stack, and the plurality of spacers are positioned in the second direction by being in contact with the cooler.

4 . The power storage device according to claim 1 , wherein
the housing case has a bottom, the bottom, on the one side of the second direction, facing the power storage stack, and the plurality of spacers are positioned in the second direction by being in contact with the bottom.

Assignees

• Toyota Motor Co Ltd

Inventors

• Matsushita Taro
• Kondo Tadahiro
• Ishikawa Shotaro
• Kishi Koichiro
• Watanabe Kenta

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/293 Primary

  characterised by the material · CPC title

• H01M50/291 Primary

  characterised by their shape · CPC title

• H01M50/207

  characterised by their shape · 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