Granted Patent B2

US 12,573,723 · App. 17/666,142 · Granted Mar 10, 2026

Inventors: Ryota Tajima (Kanagawa, JP); Kensuke Yoshizumi (Kanagawa, JP)

Assignee: Semiconductor Energy Laboratory Co., Ltd.

H01M50/533H01M50/105H01M50/121H01M50/129H01M50/133H01M50/178H01M50/55H01M50/557H01M10/0585H01M2220/30

Abstract

Claims (65)

1 . A battery comprising:

a first lead;

a second lead;

a first current collector;

a second current collector; and

an exterior body enclosing the first current collector and the second current collector,

wherein each of the first current collector and the second current collector is one conductive film,

wherein the first current collector includes a first portion not coated with a first active material and a second portion coated with the first active material,

wherein the first current collector has the first portion in a first direction extending to a first side of the exterior body,

wherein the second current collector includes a third portion not coated with a second active material and a fourth portion coated with the second active material,

wherein the second current collector has the third portion in the first direction extending to the first side of the exterior body,

wherein the first lead is bonded to the first portion so that the first lead extends in the first direction,

wherein the second lead is bonded to the third portion so that the second lead extends in the first direction,

wherein the first portion has one fold and the first lead has no fold in an inside of the exterior body so that the first lead, the second portion, the fourth portion, and a part of the first portion overlap each other in a portion and the first lead penetrates out of the exterior body from the first side, and

wherein the third portion has one fold and the second lead has no fold in the inside of the exterior body so that the second lead, the second portion, the fourth portion, and a part of the third portion overlap each other in a portion and the second lead penetrates out of the exterior body from the first side.

2 . The battery according to claim 1 , further comprising:

an insulating fixing member,

wherein the first lead, the first current collector, and the second current collector are fixed by the insulating fixing member in a portion where the first lead, the first current collector, and the second current collector overlap each other, and

wherein the second lead, the first current collector, and the second current collector are fixed by the insulating fixing member in a portion where the second lead, the first current collector, and the second current collector overlap each other.

3 . The battery according to claim 1 ,

wherein the first current collector is folded back between the second portion and a bonding portion of the first portion to the first lead,

wherein the first lead, the first portion, and the second portion overlap each other in a portion,

wherein the second current collector is folded back between the fourth portion and a bonding portion of the third portion to the second lead, and

wherein the second lead, the third portion, and the fourth portion overlap each other in a portion.

4 . The battery according to claim 3 ,

wherein the first current collector is folded back such that a surface of the first current collector faces outward, the surface of the first current collector being bonded to the first lead, and

wherein the second current collector is folded back such that a surface of the second current collector faces outward, the surface of the second current collector being bonded to the second lead.

5 . The battery according to claim 3 , further comprising:

a first insulating member; and

a second insulating member,

wherein the part of the first portion and the second portion overlap each other with the first insulating member positioned therebetween, and

wherein the part of the third portion and the fourth portion overlap each other with the second insulating member positioned therebetween.

6 . The battery according to claim 5 ,

wherein the first insulating member covers the first portion and the first lead, and

wherein the second insulating member covers the third portion and the second lead.

7 . The battery according to claim 1 ,

wherein the exterior body has a film-like shape and is folded in two such that the first current collector and the second current collector are sandwiched by the exterior body,

wherein the exterior body includes a pair of first seal portions by which the first current collector and the second current collector are sandwiched and a second seal portion overlapping with the first lead and the second lead, and

wherein the exterior body has a wave shape almost parallel to the second seal portion in a region overlapping with the first current collector and the second current collector.

8 . The battery according to claim 7 , wherein the first seal portions and the second seal portion are flat without the wave shape.

9 . The battery according to claim 7 , wherein a distance between each of the first seal portions and an end portion of the first current collector or an end portion of the second current collector is 0.8 times or more and 3.0 times or less as large as a thickness of a stack including the first current collector and the second current collector.

10 . The battery according to claim 7 , wherein a difference between a distance between the pair of first seal portions and a width of the first current collector or a width of the second current collector is 1.6 times or more and 6.0 times or less as large as a thickness of a stack including the first current collector and the second current collector.

11 . A battery comprising:

a plurality of positive electrodes each comprising:

a current collector comprising a first portion and a second portion; and

an active material layer over the second portion;

a positive electrode lead electrically connected to the plurality of positive electrodes; and

an exterior body enclosing the plurality of positive electrodes,

wherein each of the current collectors is one conductive film,

wherein each the active material layer is not arranged over the first portion in the plurality of positive electrodes,

wherein each of the plurality of positive electrodes has the first portion in a first direction extending to a first side of the exterior body,

wherein the plurality of positive electrodes are stacked each interposing a negative electrode and a separator,

wherein the first portion of one of the plurality of positive electrodes comprises a bonding portion to the positive electrode lead,

wherein the positive electrode lead penetrates out of the exterior body from the first side, and

wherein the first portions of the plurality of positive electrodes have one fold to fold back in a direction opposite from the first direction and the positive electrode lead has no fold in an inside of the exterior body so that the bonding portion and the second portions of the plurality of positive electrodes overlap each other.

12 . The battery according to claim 11 , wherein a tip of the first portion and the second portions of the plurality of positive electrodes overlap each other.

13 . The battery according to claim 12 , further comprising:

a first insulating member interposed between the tip of the first portion and the second portions of the plurality of positive electrodes.

14 . The battery according to claim 11 , further comprising:

an insulating fixing member,

wherein the exterior body further encloses a part of the positive electrode lead and the insulating fixing member, and

wherein the insulating fixing member positions, the bonding portion, and the second portions of the plurality of positive electrodes overlap each other.

15 . The battery according to claim 14 ,

wherein one end of the positive electrode lead is configured to be covered with the insulating fixing member, and

wherein the other end of the positive electrode lead positions outside the exterior body.

Priority Claims (1)

Continuity (2)

References Cited (94)