All solid state battery

Patent metadata

Field	Value
Publication number	US-11710878-B2
Application number	US-202117159428-A
Country	US
Kind code	B2
Filing date	Jan 27, 2021
Priority date	Jan 31, 2020
Publication date	Jul 25, 2023
Grant date	Jul 25, 2023

Abstract

An all solid state battery in which positional displacement of a plurality of cells arranged along a thickness direction can be prevented is provided. The all solid state battery includes a plurality of cells connected in series, wherein the all solid state battery includes a cell unit A and a cell unit B, a first current collector A in the cell A and a second current collector B in the cell B are arranged to face each other, the first current collector A includes a tab A, the second current collector B includes a tab B, and the tab A and the tab B are fixed by a fixing portion.

First claim

What is claimed is:

1. An all solid state battery comprising a plurality of cells arranged along a thickness direction and connected in series,
the all solid state battery includes a cell A and a cell B as the cells,
the cell A includes a first current collector A, a first active material layer A, a solid electrolyte layer A, a second active material layer A and a second current collector A, in this order,
the cell B includes a first current collector B, a first active material layer B, a solid electrolyte layer B, a second active material layer B and a second current collector B, in this order,
the first current collector A in the cell A and the second current collector B in the cell B are arranged to face each other,
the first current collector A includes a tab A at a position not overlapping with the first active material layer A in plan view,
the second current collector B includes a tab B at a position not overlapping with the second active material layer B in plan view, and
the tab A and the tab B are fixed by a fixing portion,
wherein a first insulating portion is arranged on a surface of the tab B facing away from the tab A,
an outer edge of the first insulating portion is located on an outer side with respect to an outer edge of the tab A in plan view, and
the tab A and the tab B are bent so as the first insulating portion is on an outside, and the fixing portion is located on an inner side with respect to a bending center.

2. The all solid state battery according to claim 1 , wherein an outer edge of the tab B is located on the outer side with respect to the outer edge of the tab A in plan view.

3. The all solid state battery according to claim 1 , wherein an insulating adhesive portion is arranged on at least one surface of the fixing portion.

4. The all solid state battery according to claim 1 , wherein the fixing portion is a welded portion.

5. An all solid state battery comprising a plurality of cell units arranged along a thickness direction and connected in series,
the all solid state battery includes a cell unit A and a cell unit B as the cell units,
the cell unit A includes:
a first current collector A,
a first active material layer AX, a solid electrolyte layer AX, a second active material layer AX and a second current collector AX, arranged in order from a first surface side of the first current collector A, and
a first active material layer AY, a solid electrolyte layer AY, a second active material layer AY and a second current collector AY, arranged in order from a second surface side opposite to the first surface side of the first current collector A,
the cell unit B includes:
a first current collector B, and
a first active material layer BX, a solid electrolyte layer BX, a second active material layer BX and a second current collector BX, arranged in order from a first surface side of the first current collector B,
a first active material layer BY, a solid electrolyte layer BY, a second active material layer BY and a second current collector BY, arranged in order from a second surface side opposite to the first surface side of the first current collector B,
the second current collector AY in the cell unit A, and the second current collector BX in the cell unit B are arranged to face each other, interposing a second insulating portion,
the second current collector AX includes a tab AX at a position not overlapping with the second active material layer AX in plan view,
the second current collector AY includes a tab AY at a position not overlapping with the second active material layer AY in plan view,
the first current collector B includes a tab B at a position not overlapping with the first active material layer BX and the first active material layer BY in plan view, and
the tab AX, the tab AY, and the tab B are fixed by a fixing portion,
a first insulating portion is arranged on a surface of the tab AX facing away from the tab AY,
an outer edge of the first insulating portion is located on an outer side of an outer edge with respect to the tab B in plan view, and
the tab AX, the tab AY, and the tab B are bent so as the first insulating portion is on an outer side and the fixing portion is located on an inner side with respect to a bending center.

6. The all solid state battery according to claim 5 , wherein an outer edge of the tab AX is located on the outer side with respect to the outer edge of the tab B in plan view.

7. All solid state battery according to claim 5 , wherein an insulating adhesive portion is arranged on at least one surface of the fixing portion.

8. The all solid state battery according to claim 5 , wherein the fixing portion is a welded portion.

Assignees

• Toyota Motor Co Ltd

Inventors

• Hasegawa Hajime
• Tanaka Takumi
• Yamamoto Satomi
• Tanimoto Koichi

Classifications

• H01M50/536 Primary

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · 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

• H01M50/533

  characterised by the shape of the leads or tabs · CPC title

• H01M10/058 Primary

  Construction or manufacture · CPC title

• H01M10/0413 Primary

  Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes · CPC title