Unit solid-state battery and method for producing unit solid-state battery

Patent metadata

Field	Value
Publication number	US-2024304854-A1
Application number	US-202218546783-A
Country	US
Kind code	A1
Filing date	Jan 26, 2022
Priority date	Feb 19, 2021
Publication date	Sep 12, 2024
Grant date	—

Abstract

The present invention provides: unit solid-state batteries which have a single structure and are capable of constituting a solid-state battery module having an arbitrary capacity and an arbitrary output by being combined with each other without generating an ineffective portion of an electrode material in both ends of the stack; and a method for producing this unit solid-state battery. A unit solid-state battery which constitutes a solid-state battery, and which comprises: a solid electrolyte layer; and a negative electrode material layer and a positive electrode material layer, which are superposed on both surfaces of the solid electrolyte layer as electrode material layers. With respect to this unit solid-state battery, the negative electrode material layer and the positive electrode material layer do not contain a collector.

First claim

1 . A unit solid-state battery constituting a solid-state battery, the unit solid-state battery comprising:
a solid electrolyte layer; and a negative electrode material layer and a positive electrode material layer as electrode material layers respectively laminated on both sides of the solid electrolyte layer, the negative electrode material layer and the positive electrode material layer each not comprising a current collector.

2 . The unit solid-state battery according to claim 1 , wherein, in a plan view of the unit solid-state battery in a laminating direction,
the solid electrolyte layer has a larger area than that of each of the negative electrode material layer and the positive electrode material layer, and the solid electrolyte layer has an outer edge disposed outward of an outer edge of the negative electrode material layer and an outer edge of the positive electrode material layer.

3 . A solid-state battery module comprising a laminated cell structure formed by laminating a plurality of the unit solid-state batteries according to claim 1 ,
the laminated cell structure being a first laminated cell structure, wherein a current collecting electrode plate is disposed between each of the unit solid-state batteries, the unit solid-state batteries adjacent to each other are arranged such that the positive electrode material layers are adjacent to each other and the negative electrode material layers are adjacent to each other, a negative electrode plate serving as the current collecting electrode plate is disposed between the adjacent negative electrode material layers, a positive electrode plate serving as the current collecting electrode plate is disposed between the adjacent positive electrode material layers, and the current collecting electrode plate or the electrode material layer disposed at one of two ends of the laminated cell structure of the laminated unit solid-state batteries is of the same type as the current collecting electrode plate or the electrode material layer disposed at the other of the two ends of the laminated cell structure of the laminated unit solid-state batteries.

4 . The solid-state battery module according to claim 3 , wherein
the solid-state battery module is formed by laminating a plurality of the first laminated cell structures, and a type of the current collecting electrode plate or the electrode material layer disposed at each of the two ends differs between the first laminated cell structures adjacent to each other.

5 . A solid-state battery module comprising a laminated cell structure formed by laminating a plurality of the unit solid-state batteries according to claim 1 ,
the laminated cell structure being a second laminated cell structure, wherein a current collecting electrode plate is disposed between each of the unit solid-state batteries, the unit solid-state batteries adjacent to each other are arranged such that the negative electrode material layers are adjacent to each other and the positive electrode material layers are adjacent to each other, a negative electrode plate serving as the current collecting electrode plate is disposed between the adjacent negative electrode material layers, a positive electrode plate serving as the current collecting electrode plate is disposed between the adjacent positive electrode material layers, and the current collecting electrode plate or the electrode material layer disposed at one of two ends of the laminated cell structure of the laminated unit solid-state batteries is of a different type to the current collecting electrode plate or the electrode material layer disposed at the other of the two ends of the laminated cell structure of the laminated unit solid-state batteries.

6 . A solid-state battery module comprising a laminated cell structure formed by laminating a plurality of the unit solid-state batteries according to claim 1 ,
the laminated cell structure being a third laminated cell structure, wherein a current collecting electrode plate is disposed between each of the unit solid-state batteries, the unit solid-state batteries adjacent to each other are arranged such that the negative electrode material layer and the positive electrode material layer are adjacent to each other, a bipolar electrode plate is disposed between the adjacent negative electrode material layer and the positive electrode material layer, the current collecting electrode plate or the electrode material layer disposed at one of two ends of the laminated cell structure of the laminated unit solid-state batteries is of a different type to the current collecting electrode plate or the electrode material layer disposed at the other of the two ends of the laminated cell structure of the laminated unit solid-state batteries, and a negative electrode plate is disposed in contact with the negative electrode material layer and a positive electrode plate is disposed in contact with the positive electrode material layer, at the two ends of the laminated cell structure.

7 . A method for producing a unit solid-state battery constituting a solid-state battery, the method comprising:
a sheet forming step of forming a negative electrode material sheet comprising a negative electrode material, a positive electrode material sheet comprising a positive electrode material, and a solid electrolyte sheet comprising a solid electrolyte; and a pressing step of pressing the negative electrode material sheet and the positive electrode material sheet with the solid electrolyte sheet interposed therebetween.

8 . A method for producing a unit solid-state battery constituting a solid-state battery, the method comprising:
a negative electrode material applying step of applying a negative electrode material layer comprising a negative electrode material to one side of a solid electrolyte sheet comprising a solid electrolyte; and a positive electrode material applying step of applying a positive electrode material layer comprising a positive electrode material to the other side of the solid electrolyte sheet.

9 . The method according to claim 7 , comprising:
a first cutting step of cutting the negative electrode material sheet and the positive electrode material sheet; a second cutting step of cutting the solid electrolyte sheet so as to have a larger area than that of each of the positive electrode material sheet and the negative electrode material sheet in plan view; and a laminating step of laminating the negative electrode material sheet, the solid electrolyte sheet, and the positive electrode material sheet in this order.

10 . A method for producing a solid-state battery module formed by laminating a plurality of unit solid-state batteries produced by the method according to claim 9 , the method comprising:
a disposing step of disposing a current collecting electrode plate between each of the unit solid-state batteries adjacent to each other between the laminating step and the pressing step.

Assignees

• Honda Motor Co Ltd

Inventors

• Akutsu Shigemitsu
• Fujimoto Shinji
• Sukigara Toru
• Aoyagi Shintaro

Classifications

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• H01M10/0585

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

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M50/528

  Fixed electrical connections, i.e. not intended for disconnection · CPC title