Battery having a plurality of solid-state battery cells

Patent metadata

Field	Value
Publication number	US-12362385-B2
Application number	US-202217851053-A
Country	US
Kind code	B2
Filing date	Jun 28, 2022
Priority date	Jan 24, 2020
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A battery includes: a plurality of solid-state battery cells; and a connection layer located between the solid-state battery cells. Each of the solid-state battery cells has a structure in which a positive electrode current collector, a positive electrode active material layer, a solid electrolyte layer including an inorganic solid electrolyte, a negative electrode active material layer, and a negative electrode current collector are laminated in this order. The solid-state battery cells are electrically connected in series. The positive electrode current collector of one of a pair of the solid-state battery cells and the negative electrode current collector of the other of the pair of the solid-state battery cells are laminated via the connection layer, the pair of the solid-state battery cells are adjacent solid-state battery cells among the solid-state battery cells. The connection layer includes a conductive material, and the Young's modulus of the connection layer is lower than the Young's moduli of the positive electrode current collector, the positive electrode active material layer, the solid electrolyte layer, the negative electrode active material layer, and the negative electrode current collector.

First claim

What is claimed is:

1. A battery comprising:
a plurality of solid-state battery cells;
a buffer layer located between the solid-state battery cells; and
a connection layer located between the solid-state battery cells, wherein
each of the solid-state battery cells has a structure in which a positive electrode current collector, a positive electrode active material layer, a solid electrolyte layer including an inorganic solid electrolyte, a negative electrode active material layer, and a negative electrode current collector are laminated in this order,
the solid-state battery cells are electrically connected in series,
the positive electrode current collector of one of a pair of the solid-state battery cells and the negative electrode current collector of the other of the pair of the solid-state battery cells are laminated via the connection layer, the pair of the solid-state battery cells being adjacent solid-state battery cells among the solid-state battery cells,
the connection layer includes a conductive material,
the buffer layer includes the inorganic solid electrolyte and a different material from the connection layer, and
the Young's modulus of the connection layer is lower than the Young's moduli of the positive electrode current collector, the positive electrode active material layer, the solid electrolyte layer, the negative electrode active material layer, and the negative electrode current collector.

2. The battery according to claim 1 , wherein
the connection layer includes a resin.

3. The battery according to claim 1 , wherein
the connection layer includes a solid electrolyte.

4. The battery according to claim 1 , wherein
the connection layer includes a void.

5. The battery according to claim 1 , wherein
the thickness of the connection layer is greater than or equal to 1 μm and less than or equal to 20 μm.

6. The battery according to claim 1 , wherein
the connection layer is located inside the outer periphery of the positive electrode current collector and the outer periphery of the negative electrode current collector in plan view.

7. The battery according to claim 6 , wherein
the Young's modulus of the buffer layer is less than or equal to the Young's moduli of the positive electrode current collector, the positive electrode active material layer, the solid electrolyte layer, the negative electrode active material layer, and the negative electrode current collector.

8. The battery according to claim 7 , wherein
the buffer layer has a frame shape and surrounds the outer periphery of the connection layer in plan view.

9. The battery according to claim 7 , wherein
the Young's modulus of the buffer layer is lower than the Young's modulus of the connection layer.

10. The battery according to claim 7 , wherein
the buffer layer is free from a conductive material.

11. The battery according to claim 1 , wherein
the inorganic solid electrolyte has lithium ion conductivity.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Koga Eiichi

Classifications

• H01M50/198

  characterised by physical properties, e.g. adhesiveness or hardness · CPC title

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/19

  characterised by the material · CPC title

• H01M10/0585

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

• H01M50/471

  Spacing elements inside cells other than separators, membranes or diaphragms (for preventing incorrect contact inside or outside batteries H01M50/584); Manufacturing processes thereof · CPC title