Solid state battery and solid state battery manufacturing method

Patent metadata

Field	Value
Publication number	US-11545699-B2
Application number	US-202016838068-A
Country	US
Kind code	B2
Filing date	Apr 2, 2020
Priority date	Apr 24, 2019
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

What is provided is a solid state battery and a solid state battery manufacturing method capable of more reliably preventing short-circuiting. A solid state battery includes: a first electrode piece in which a first electrode active material layer is formed on a first current collector layer; a second electrode piece in which a second electrode active material layer is formed on a second current collector layer; and a bag-shaped solid electrolyte layer which accommodates the first electrode piece, wherein the first electrode piece accommodated in the bag-shaped solid electrolyte layer and the second electrode piece are laminated so as to overlap each other in a plan view so that the first electrode active material layer and the second electrode active material layer are disposed so as to face each other with the solid electrolyte layer interposed therebetween.

First claim

What is claimed is:

1. A solid state battery, comprising:
a first electrode piece in which a first electrode active material layer is formed on a first current collector layer;
a second electrode piece in which a second electrode active material layer is formed on a second current collector layer;
a bag-shaped solid electrolyte layer which accommodates the first electrode piece; and
a bellows-folded electrode sheet,
wherein the first electrode piece accommodated in the bag-shaped solid electrolyte layer and the second electrode piece are laminated so as to overlap each other in a plan view so that the first electrode active material layer and the second electrode active material layer are disposed so as to face each other with the bag-shaped solid electrolyte layer interposed therebetween,
wherein the electrode sheet includes a first connection portion which is formed by the first current collector layer and extends in a belt shape, a plurality of the first electrode pieces which are connected to a side surface of the first connection portion and are respectively accommodated in the bag-shaped solid electrolyte layer, a second connection portion which is formed by the second current collector layer and extends in a belt shape, and a plurality of the second electrode pieces which are connected to a side surface of the second connection portion,
wherein the first electrode piece is formed such that the first electrode active material layer is formed on both surfaces of the first current collector layer and the second electrode piece is formed such that the second electrode active material layer is formed on both surfaces of the second current collector layer,
wherein the first connection portion and the second connection portion are disposed so as to face each other in a plan view, and a first region and a second region are alternately formed between the first connection portion and the second connection portion in a longitudinal direction, the first region being formed such that the bag-shaped solid electrolyte layer accommodating the first electrode piece and the second electrode piece are laminated and the second region being formed such that the bag-shaped solid electrolyte layer and the second electrode piece are laminated in a laminating order opposite to that of the first region,
wherein the electrode sheet is folded in a bellows shape so that the first region and the second region are alternately laminated, and
wherein the first connection portion and the second connection portion are formed in a region in which the first electrode active material layer and the second electrode active material layer are not formed.

2. A solid state battery, comprising:
a first electrode piece in which a first electrode active material layer is formed on a first current collector layer;
a second electrode in which a second electrode active material layer is formed on a second current collector layer;
a bag-shaped solid electrolyte layer which accommodates the first electrode piece; and
a bellows-folded electrode sheet,
wherein the first electrode piece accommodated in the bag-shaped solid electrolyte layer and the second electrode are laminated so as to overlap each other in a plan view so that the first electrode active material layer and the second electrode active material layer are disposed so as to face each other with the bag-shaped solid electrolyte layer interposed therebetween,
wherein the electrode sheet includes a first connection portion which is formed by the first current collector layer and extends in a belt shape, a plurality of the first electrode pieces which are connected to a side surface of the first connection portion and are respectively accommodated in the bag-shaped solid electrolyte layer, a second connection portion which is formed by the second current collector layer and extends in a belt shape, and the second electrode which is connected to a side surface of the second connection portion and extends in a belt shape,
wherein the first electrode piece is formed such that the first electrode active material layer is formed on both surfaces of the first current collector layer and the second electrode is formed such that the second electrode active material layer is formed on both surfaces of the second current collector layer,
wherein the first connection portion and the second connection portion are disposed so as to face each other in a plan view and a first region and a second region are alternately formed between the first connection portion and the second connection portion in a longitudinal direction, the first region being formed such that the bag-shaped solid electrolyte layer accommodating the first electrode piece and the second electrode are laminated and the second region being formed such that the bag-shaped solid electrolyte layer and the second electrode are laminated in a laminating order opposite to that of the first region,
wherein the electrode sheet is folded in a bellows shape so that the first region and the second region are alternately laminated,
wherein the first connection portion and the second connection portion are formed in a region in which the first electrode active material layer and the second electrode active material layer are not formed.

3. The solid state battery according to claim 1 ,
wherein the first electrode active material layer is a positive electrode active material layer and the second electrode active material layer is a negative electrode active material layer.

4. The solid state battery according to claim 1 ,
wherein the bag-shaped solid electrolyte layer is formed by a solid electrolyte layer sheet, and
wherein the solid electrolyte layer sheet is disposed so as to cover opposing surfaces of the first electrode piece by being bonded along the opposing surfaces of the first electrode piece.

5. A method of manufacturing the solid state battery according to claim 1 , comprising:
forming the electrode sheet including the first connection portion which is formed by the first current collector layer and extends in the belt shape and the plurality of the first electrode pieces which are connected to the side surface of the first connection portion, having the first electrode active material layer formed on both surfaces of the first current collector layer, and having a rectangular shape in a plan view;
disposing a solid electrolyte layer sheet on both surfaces of the first electrode piece so as to continuously cover at least a portion of the plurality of the first electrode pieces by exposing the first connection portion;
bonding the solid electrolyte layer sheet between the adjacent first electrode pieces along end surfaces of the plurality of the first electrode pieces in a direction orthogonal to a longitudinal direction of the electrode sheet; and
forming the bag-shaped solid electrolyte layer accommodating each of the plurality of the first electrode pieces by cutting the solid electrolyte layer sheet between adjacent ones of the first electrode pieces of the plurality of first electrode pieces.

6. The solid state battery according to claim 1 ,
wherein the bag-shaped solid electrolyte layer has a configuration in which a solid electrolyte layer sheet having a porous base material and a solid electrolyte held by the porous base material is formed in a bag shape, and
wherein the porous base material is formed of nylon, polyester, polyethylene, polypropylene, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride, polyvinylidene chloride, polyvinyl chloride, polyurethane, vinylon, polybenzimidazole, polyimide, polyphenylene sulfide, polyetheretherketone, acrylic resin, or glass.

7. The solid state battery according to claim 1 ,
wherein the bag-shaped sol

Assignees

• Honda Motor Co Ltd

Inventors

• Ohta Masahiro
• Shimizu Wataru
• Sukigara Toru

Classifications

• H01M4/139

  Processes of manufacture · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M50/54

  Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

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