Aluminum foil

Patent metadata

Field	Value
Publication number	US-12002965-B2
Application number	US-202217675160-A
Country	US
Kind code	B2
Filing date	Feb 18, 2022
Priority date	Aug 22, 2019
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

Provided is a long aluminum foil capable of suppressing, in a case where the aluminum foil is provided with a region where through-holes are not formed, occurrence of deformation at a boundary portion between a region where through-holes are formed and the region where through-holes are not formed. The long aluminum foil includes, in a width direction orthogonal to a longitudinal direction, a perforated portion, a non-perforated portion, and a boundary portion between the perforated portion and the non-perforated portion, in which the perforated portion has a plurality of through-holes penetrating therethrough in a thickness direction, the non-perforated portion does not have a through-hole, the boundary portion has a plurality of through-holes penetrating therethrough in the thickness direction and a plurality of non-through-holes, and an opening ratio of the through-hole in the boundary portion gradually decreases from a perforated portion side to a non-perforated portion side.

First claim

What is claimed is:

1. A long aluminum foil comprising:
in a width direction orthogonal to a longitudinal direction,
a perforated portion;
two non-perforated portions, each provided separately at both ends of the long aluminum foil in the width direction; and
a hole density decreasing portion between the perforated portion and each of the two non-perforated portions,
wherein the perforated portion has a plurality of through-holes penetrating therethrough in a thickness direction,
the two non-perforated portions do not have a through-hole,
the hole density decreasing portions have a plurality of through-holes penetrating therethrough in the thickness direction and a plurality of non-through-holes that do not penetrate, and
in the hole density decreasing portions, an opening ratio due to the through-holes gradually decreases from a perforated portion side to a non-perforated portion side.

2. The long aluminum foil according to claim 1 ,
wherein the perforated portion further has a plurality of non-through-holes.

3. The long aluminum foil according to claim 2 ,
wherein an area occupation ratio of the non-through-holes in the perforated portion is 1% or more and 20% or less.

4. The long aluminum foil according to claim 1 ,
wherein a specific surface area ΔS 1 on a surface of the perforated portion is 5% or more.

5. The long aluminum foil according to claim 1 ,
wherein a specific surface area ΔS 2 on a surface of the hole density decreasing portions is 2.5% or more.

6. The long aluminum foil according to claim 1 ,
wherein an area occupation ratio of the non-through-holes in the hole density decreasing portions is 1% or more and 15% or less.

7. The long aluminum foil according to claim 1 ,
wherein in the width direction, a number density of the through-holes in each of the hole density decreasing portions gradually decreases from the perforated portion side to the non-perforated portion side, and
an average number density of the through-holes in the hole density decreasing portions is 10% or more and 90% or less of an average number density of the through-holes in the perforated portion.

8. The long aluminum foil according to claim 1 ,
wherein an average opening diameter of the hole density decreasing portions is 0.1 μm to 100 μm.

9. The long aluminum foil according to claim 1 ,
wherein a width of the hole density decreasing portions in the width direction is 3 mm or more.

10. The long aluminum foil according to claim 1 ,
wherein the long aluminum foil is wound in a roll shape.

11. The long aluminum foil according to claim 2 ,
wherein a specific surface area ΔS 1 on a surface of the perforated portion is 5% or more.

12. The long aluminum foil according to claim 2 , wherein a specific surface area ΔS 2 on a surface of the hole density decreasing portions is 2.5% or more.

13. The long aluminum foil according to claim 2 ,
wherein an area occupation ratio of the non-through-holes in the hole density decreasing portions is 1% or more and 15% or less.

14. The long aluminum foil according to claim 2 ,
wherein in the width direction, a number density of the through-holes in each of the hole density decreasing portions gradually decreases from the perforated portion side to the non-perforated portion side, and
an average number density of the through-holes in the hole density decreasing portions is 10% or more and 90% or less of an average number density of the through-holes in the perforated portion.

15. The long aluminum foil according to claim 2 ,
wherein an average opening diameter of the through-holes in the hole density decreasing portions is 0.1 μm to 100 μm.

16. The long aluminum foil according to claim 2 ,
wherein a width of the hole density decreasing portions in the width direction is 3 mm or more.

17. The long aluminum foil according to claim 1 ,
wherein the perforated portion further has a plurality of non-through-holes,
an area occupation ratio of the non-through-holes in the perforated portion is 1% or more and 20% or less, and
an average opening ratio of the through holes in the perforated portion is 0.15% to 30%.

Assignees

• Fujifilm Corp

Inventors

• Sawada Hirokazu

Classifications

• H01M4/762 Primary

  Porous or perforated metallic containers · CPC title

• H01M4/661 Primary

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M4/765

  Tubular type or pencil type electrodes; tubular or multitubular sheaths or covers of insulating material for said tubular-type electrodes · CPC title

• Y10T428/12479

  Porous [e.g., foamed, spongy, cracked, etc.] · CPC title

• H01G11/70

  characterised by their structure · CPC title