BATTERY AND MANUFACTURING METHOD OF THE SAME

1 . A battery comprising:

a first lead;

a second lead;

a first current collector; and

a second current collector,

wherein the first current collector includes a first portion bonded to the first lead and a second portion coated with a first active material,

wherein the second current collector includes a third portion bonded to the second lead and a fourth portion coated with a second active material,

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

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

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 with 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 with each other.

3 . The battery according to claim 1 ,

wherein the first current collector is folded back between the first portion and the second portion,

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

wherein the second current collector is folded back between the third portion and the fourth portion, and

wherein the second lead, the third portion, and the fourth portion overlap with 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 first portion and the second portion overlap with each other with the first insulating member positioned therebetween, and

wherein the third portion and the fourth portion overlap with 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 , further comprising:

an exterior body,

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 method for manufacturing a battery including a first current collector, a second current collector, a first lead, and a second lead, comprising:

a first step of stacking the first current collector and the second current collector,

a second step of bonding the first lead to the first current collector and bonding the second lead to the second current collector, and

a third step of fixing the first current collector, the second current collector, the first lead, and the second lead by a fixing member.

12 . The method for manufacturing a battery according to claim 11 , further comprising:

a fourth step of folding back a part of the first current collector and a part of the second current collector between the second step and the third step.

13 . The method for manufacturing a battery according to claim 12 , further comprising:

a fifth step of stacking a plurality of first current collectors and a plurality of second current collectors instead of the first step,

wherein, in the fifth step, the plurality of first current collectors are stacked such that positions of the plurality of first current collectors are shifted from each other, and the plurality of second current collectors are stacked such that positions of the plurality of second current collectors are shifted from each other.

14 . A battery comprising:

a current collector including:

a first portion bonded to a lead in a bonding portion; and

a second portion coated with an active material,

wherein the first portion is bent such that the bonding portion overlaps with the second portion.

15 . The battery according to claim 14 , wherein the battery is a secondary battery.