All solid state battery

Patent metadata

Field	Value
Publication number	US-2023275266-A1
Application number	US-202318313823-A
Country	US
Kind code	A1
Filing date	May 8, 2023
Priority date	Jan 31, 2020
Publication date	Aug 31, 2023
Grant date	—

Abstract

An all solid state battery in which shift in positions of a plurality of a cell unit arranged along a thickness direction can be prevented is provided. The all solid state battery includes a plurality of the cell unit connected in series. The all solid state battery includes a cell unit A and a cell unit B, a second current collector AY in the cell unit A and a second current collector BX in the cell unit B are arranged to face each other interposing a first insulating portion, and a tab AX, a tab AY, and a tab B are fixed by a fixing member.

First claim

What is claimed is:

1 . An all solid state battery comprising a plurality of a cell unit 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 unit, 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, 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, and 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 first insulating portion, the second current collector AX includes a tab AX at a position not overlapping the second active material layer AX in planar view, the second current collector AY includes a tab AY at a position not overlapping the second active material layer AY in planar view, the first current collector B includes a tab B at a position not overlapping the first active material layer BX and the first active material layer BY in planar view, the tab AX, the tab AY, and the tab B are fixed by a fixing member, the fixing member includes a first holding portion, a second holding portion, and a connecting portion connecting the first holding portion and the second holding portion, and the tab AX, the tab AY, and the tab B are sandwiched and fixed between the first holding portion and the second holding portion of the fixing member, the fixing member is elastic, and the tab AX, the tab AY, and the tab B are pressurized in the thickness direction by sagging of the connecting portion.

2 . The all solid state battery according to claim 1 ,
wherein a first distance is a distance between the first holding portion and the second holding portion in the thickness direction at an end of a connecting portion-side in a state the fixing member does not sandwich the tab AX, the tab AY, and the tab B, wherein the second distance is a distance between the first holding portion and the second holding portion in the thickness direction at a position located on an inner-side of the end of the connecting portion-side in the state the fixing member does not sandwich the tab AX, the tab AY, and the tab B, wherein the second distance is smaller than the first distance.

Assignees

• Toyota Motor Co Ltd

Inventors

• Yamamoto Satomi
• Omori Keisuke
• Hasegawa Hajime

Classifications

• H01M10/0562 Primary

  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

• H01M10/0585 Primary

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

• H01M50/54

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

• H01M2300/0065

  Solid electrolytes · CPC title