Granted Patent B2

US 12,738,527 · App. 18/006,206 · Granted Sep 15, 2026

Inventors: Shuhei Yoshitomi (Ayase, JP); Tetsuji Ishitani (Atsugi, JP)

Assignee: Semiconductor Energy Laboratory Co., Ltd.

H01M10/049H01M10/0409

Abstract

Claims (23)

1 . A method for fabricating a secondary battery, comprising:

placing a first electrode over a first exterior body;

placing a separator over the first electrode;

placing a second electrode over the separator;

dripping an electrolyte on at least one of the first electrode, the separator, and the second electrode;

placing a resin layer over the first exterior body to surround the first electrode, the separator, and the second electrode in a frame-like manner;

impregnating at least one of the first electrode, the separator, and the second electrode with the electrolyte and then placing a second exterior body over the first exterior body to cover the first electrode, the separator, and the second electrode;

curing at least part of the resin layer by irradiation of the resin layer with ultraviolet light under reduced pressure; and

sealing the first electrode, the separator, and the second electrode with the first exterior body and the second exterior body under atmospheric pressure after the ultraviolet light irradiation,

wherein one of the first electrode and the second electrode is a positive electrode, and the other is a negative electrode, and

wherein an area of the resin layer irradiated with the ultraviolet light during the sealing is larger than an area of the resin layer irradiated with the ultraviolet light under the reduced pressure.

2 . The method for fabricating a secondary battery, according to claim 1 ,

wherein the first exterior body comprises a concave portion, and

wherein the first electrode, the separator, and the second electrode are placed in the concave portion.

3 . The method for fabricating a secondary battery, according to claim 1 , wherein the sealing is performed by thermocompression bonding.

4 . The method for fabricating a secondary battery, according to claim 1 , wherein the second exterior body is configured to transmit ultraviolet light at least in a region overlapping the resin layer.

5 . The method for fabricating a secondary battery, according to claim 1 , wherein the second exterior body is configured to block ultraviolet light at least in a region overlapping at least one of the first electrode, the separator, and the second electrode.

6 . The method for fabricating a secondary battery, according to claim 1 , further comprising a step of connecting a first lead electrode to the first electrode and a step of connecting a second lead electrode to the second electrode before the ultraviolet light irradiation under the reduced pressure.

7 . The method for fabricating a secondary battery, according to claim 1 , wherein the electrolyte comprises fluorine.

8 . The method for fabricating a secondary battery, according to claim 1 , wherein the electrolyte comprises an ionic liquid.

9 . The method for fabricating a secondary battery, according to claim 1 , wherein one or both of the first electrode and the second electrode comprise graphene.

10 . The method for fabricating a secondary battery, according to claim 1 , wherein the first electrode comprises a first active material layer on one or both surfaces of a first current collector.

11 . The method for fabricating a secondary battery, according to claim 1 , wherein the second electrode comprises a second active material layer on one or both surfaces of a second current collector.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (108)