Electrode, battery cell, cell stack, battery system, and method for manufacturing electrode

Patent metadata

Field	Value
Publication number	US-2024162411-A1
Application number	US-202117786218-A
Country	US
Kind code	A1
Filing date	Sep 14, 2021
Priority date	Sep 14, 2021
Publication date	May 16, 2024
Grant date	—

Abstract

An electrode used in a battery system, the electrode including a sheet made of a nonwoven fabric containing a plurality of carbon fibers. The sheet includes a first surface and a second surface that face each other in a direction along a thickness of the sheet, the plurality of carbon fibers include a first carbon fiber, the first carbon fiber includes at least one of a cut section facing the first surface and a cut section facing the second surface, a width of the sheet is less than or equal to 1000 mm, and a length of the sheet is less than or equal to 2000 mm.

First claim

1 . An electrode used in a battery system,
the electrode comprising a sheet made of a nonwoven fabric containing a plurality of carbon fibers, wherein the sheet includes a first surface and a second surface that face each other in a direction along a thickness of the sheet, the plurality of carbon fibers include a first carbon fiber, the first carbon fiber includes at least one of a cut section facing the first surface and a cut section facing the second surface, a width of the sheet is less than or equal to 1000 mm, and a length of the sheet is less than or equal to 2000 mm.

2 . The electrode according to claim 1 , wherein an average thickness of the sheet is greater than or equal to 0.5 mm and less than or equal to 3 mm.

3 . The electrode according to claim 1 , wherein the length of the sheet is greater than or equal to 500 mm.

4 . The electrode according to claim 1 , wherein a variation in thickness of the sheet is less than or equal to 25%.

5 . The electrode according to claim 1 , wherein a variation in quantity per unit area amount of the sheet is less than or equal to 25%.

6 . The electrode according to claim 1 , wherein the quantity per unit area amount of the sheet is greater than or equal to 50 g/m 2 and less than or equal to 350 g/m 2 .

7 . The electrode according to claim 1 , wherein the plurality of carbon fibers include a carbon fiber having a plurality of pleats on a surface of the carbon fiber.

8 . The electrode according to claim 1 , wherein density of the plurality of carbon fibers is greater than or equal to 1.5 g/cm 3 and less than or equal to 2.2 g/cm 3 , and
a porosity of the sheet is greater than or equal to 60% and less than or equal to 99%.

9 . A battery cell comprising the electrode according to claim 1 .

10 . A cell stack comprising a plurality of the battery cells according to claim 9 .

11 . A battery system comprising the battery cell according to claim 9 .

12 . A method for manufacturing an electrode used in a battery system, the method comprising:
preparing a sheet-like first electrode material that has a width less than or equal to 1000 mm and a length less than or equal to 2000 mm and is made of a nonwoven fabric containing a plurality of carbon fibers; and producing the electrode by cutting the first electrode material, wherein the producing the electrode includes: feeding the first electrode material to a cutting tool by rotation of a first roller and a second roller that sandwich the first electrode material; and slicing the first electrode material with the cutting tool such that a thickness of the first electrode material becomes thin.

13 . The method for manufacturing the electrode according to claim 12 , wherein in the slicing the first electrode material, the first electrode material is sliced such that an average thickness of the electrode is greater than or equal to 0.5 mm and less than or equal to 3 mm.

14 . The method for manufacturing the electrode according to claim 12 , wherein
in the preparing the first electrode material, the first electrode material having the thickness greater than twice the average thickness of the electrodes is prepared, and in the slicing the first electrode material, the first electrode material is sliced such that the electrode and a second electrode material having the thickness larger than the average thickness of the electrode are produced.

15 . The method for manufacturing the electrode according to claim 12 , wherein
in the preparing the first electrode material, the first electrode material having the thickness that is an integral multiple greater than or equal to three times the average thickness of the electrodes is prepared, and in the slicing the first electrode material, the first electrode material is sliced such that the electrode and the second electrode material having the thickness larger than the average thickness of the electrode are produced.

16 . The method for manufacturing the electrode according to claim 14 , wherein in the slicing the first electrode material, the first electrode material is sliced such that the electrode flows downward than an installation position of the cutting tool and such that the second electrode material flows upward than the installation position.

17 . The method for manufacturing the electrode according to claim 12 , wherein in the feeding the first electrode material to the cutting tool, the first electrode material is fed to the cutting tool while a guide regulates displacement in a width direction of the first electrode material.

Assignees

• Sumitomo Electric Industries

Inventors

• Ochi Yuta

Classifications

• H01M4/133 Primary

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• B26D1/025 Primary

  for thin material, e.g. for sheets, strips or the like · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title