Battery and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2023141351-A1
Application number	US-202318150668-A
Country	US
Kind code	A1
Filing date	Jan 5, 2023
Priority date	Jul 17, 2020
Publication date	May 11, 2023
Grant date	—

Abstract

A battery includes a power generating element and an insulating member. The power generating element has at least one battery cell including a positive electrode, a negative electrode, and a solid electrolyte layer, and the insulating member covers a side surface of the power generating element and having contact with the side surface. The insulating member has a wraparound portion continuously extending over an area from the side surface to a main surface of the power generating element and covering the side surface and the main surface and having contact with the side surface and the main surface.

First claim

What is claimed is:

1 . A battery comprising:
a power generating element having at least one battery cell including a positive electrode, a negative electrode, and a solid electrolyte layer; and an insulating member covering a side surface of the power generating element and having contact with the side surface, wherein the insulating member has a wraparound portion continuously extending over an area from the side surface to a main surface of the power generating element and covering the side surface and the main surface and having contact with the side surface and the main surface.

2 . The battery according to claim 1 , wherein an outer surface of the wraparound portion is rounded.

3 . The battery according to claim 1 , wherein
the insulating member has a side wall portion covering a center of the side surface and having contact with the center, and a thickness of the wraparound portion is greater than a thickness of the side wall portion.

4 . The battery according to claim 1 , wherein
the insulating member has a side wall portion covering a center of the side surface and having contact with the center, and a thickness of the side wall portion is greater than a thickness of the wraparound portion.

5 . The battery according to claim 1 , wherein the wraparound portion has a shape curved convexly toward a center of the main surface in a plan view of the main surface.

6 . The battery according to claim 1 , wherein the wraparound portion is provided at one or more corners among four corners of the main surface.

7 . The battery according to claim 1 , wherein the side surface has a step.

8 . The battery according to claim 1 , wherein
at least one of the positive electrode or the negative electrode has a collector and an active material layer located between the collector and the solid electrolyte layer, and the main surface is a surface of the collector that faces away from a surface of the collector on which the solid electrolyte layer is provided.

9 . The battery according to claim 8 , wherein the insulating member is softer than the solid electrolyte layer and the active material layer.

10 . The battery according to claim 8 , wherein the insulating member fills an edge of at least one of the solid electrolyte layer or the active material layer that touches the side surface.

11 . The battery according to claim 1 , wherein the insulating member contains resin.

12 . The battery according to claim 11 , wherein the insulating member has a laminating structure of a plurality of insulating films.

13 . The battery according to claim 12 , wherein the plurality of insulating films contain resin materials different from each other.

14 . The battery according to claim 12 , wherein the plurality of insulating layers are different in hardness from each other.

15 . The battery according to claim 12 , wherein
the plurality of insulating layers include a first film touching the side surface, and the first film is softer than the solid electrolyte layer.

16 . The battery according to claim 15 , wherein the first film is softer than the solid electrolyte layer at a temperature lower than or equal to a lower limit of an operating temperature range.

17 . The battery according to claim 12 , wherein the plurality of insulating films include a first film touching the side surface and a second film entirely covering a surface of the first film that faces away from the side surface.

18 . The battery according to claim 1 , wherein
the at least one battery cell comprises a plurality of battery cells, and the plurality of battery cells are laminated.

19 . The battery according to claim 1 , wherein the solid electrolyte layer contains a solid electrolyte having lithium-ion conductivity.

20 . A method for manufacturing a battery, the method comprising immersing, in an insulating material, a side surface of a power generating element having at least one battery cell including a positive electrode, a negative electrode, and a solid electrolyte layer.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Koga Eiichi

Classifications

• H01M10/0525 Primary

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

• Y02P70/50

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/121

  Organic material · CPC title

• H01M50/124 Primary

  having a layered structure · CPC title