Battery module

Patent metadata

Field	Value
Publication number	US-2020112062-A1
Application number	US-201916538025-A
Country	US
Kind code	A1
Filing date	Aug 12, 2019
Priority date	Oct 3, 2018
Publication date	Apr 9, 2020
Grant date	—

Abstract

A battery module is provided whereby loss of productivity can be minimized even when producing multiple exterior body parts for different battery module sizes. The battery module of the disclosure has an exterior body and an all-solid-state battery stack encapsulated in the exterior body. The exterior body has a tubular body and a pair of covers. The tubular body has flanges at both open ends. The flanges at both ends of the tubular body and the outer edge sections of the pair of covers are each joined forming joints, with the exterior body being sealed by the joints. The all-solid-state battery stack has one or multiple constituent unit cells. The direction of stacking of each of the layers of the constituent unit cell is in the axial direction of the tubular body.

First claim

1 . A battery module having an exterior body and an all-solid-state battery stack encapsulated in the exterior body, wherein
the exterior body has a tubular body and a pair of covers, the tubular body has flanges at both open ends, the flanges at both ends of the tubular body and the outer edge sections of the pair of covers are joined together to form joints, the exterior body being sealed by the joints, the all-solid-state battery stack has one or multiple constituent unit cells, each constituent unit cell has a positive electrode collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer and a negative electrode collector layer, stacked in that order, the direction of stacking of each layer forming the constituent unit cell is in the axial direction of the tubular body, the pair of covers are cup shapes having their outer edge sections as flanges, the cup-shaped bottom parts of the pair of covers are oriented to the outer sides of the open ends of the tubular body, at least one of the pair of covers has lower rigidity than the tubular body, and the all-solid-state battery stack is longer than the tubular body in the axial direction of the tubular body.

2 . The battery module according to claim 1 , wherein at least one side of each joint is folded toward the center direction of the tubular body.

3 . The battery module according to claim 2 , wherein the pair of facing sides of each joint are folded toward the center direction of the tubular body.

4 . The battery module according to claim 2 , wherein the folded side of each joint is folded with the base of the flange of the tubular body as the fulcrum.

5 . The battery module according to claim 1 , wherein a cooling sheet is disposed so that its main flat side is in contact with the surface of the tubular body.

6 . The battery module according to claim 5 , wherein the cooling sheet is disposed further toward the center of the tubular body than the joints.

7 . The battery module according to claim 5 , wherein the thickness of the region of the cooling sheet in contact with the surface is no greater than the maximum thickness of the joints protruding from the surface.

Assignees

• Toyota Motor Co Ltd

Inventors

• Oguma Yasumasa
• Kawakami Masatsugu

Classifications

• H01M10/613 Primary

  Cooling or keeping cold · CPC title

• H01M4/66

  Selection of materials · CPC title

• H01M10/0585 Primary

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M10/0525

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