EP-4742329-A1 - METHOD FOR MANUFACTURING POWER STORAGE CELL, AND POWER STORAGE CELL

EP4742329A1EP 4742329 A1EP4742329 A1EP 4742329A1EP-4742329-A1

Abstract

A method for manufacturing a power storage cell (100) includes: a bending step of bending a sheet member (120); and a disposing step of disposing an inner surface (111D) of a bent conductive layer (111) on an insulation support layer (110). The bending step includes: bringing an inner surface (110A) of the insulation support layer (110) into contact with an inner portion (111A); bringing an outer surface (110B) of the insulation support layer (110) into contact with an outer portion (111B); and causing an end portion (110C) of the insulation support layer (110) to face a connecting portion

Inventors

OGURA, MASAYA
SHIMURA, YOSUKE
NAKASHIMA, SATOSHI
KAKISHITA, KENICHI
CHIHARA, Masashi
AWANO, HIROKI
SATO, RYOSUKE
NAGANO, YASUAKI

Assignees

TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date: 20260513
Application Date: 20251015

Claims (8)

A method for manufacturing a power storage cell (100) including an electrode sheet (10A), the method comprising: a forming step of forming a sheet member (120) including an electrode foil (111, 311) and an active material layer (12A), the electrode foil including a first main surface (111E) and a second main surface (111D), the active material layer being formed on the first main surface; a bending step of bending the sheet member; and a disposing step of disposing the second main surface of the bent electrode foil on an insulation support layer (110), wherein the bending step includes bending the sheet member to thereby form, in the electrode foil, a first portion (111A), a second portion (111B) arranged with the first portion in a thickness direction of the insulation support layer, and a connecting portion (111C) that connects the first portion to the second portion, and assuming that a direction intersecting the thickness direction is defined as an intersecting direction, one of the bending step and the disposing step includes (i) bringing a first surface (110A) of the insulation support layer provided at one end of the insulation support layer in the thickness direction into contact with the first portion, (ii) bringing a second surface (110B) of the insulation support layer opposite to the first surface into contact with the second portion, and (iii) causing an end portion (110C) of the insulation support layer in the intersecting direction to face the connecting portion in the intersecting direction, to thereby form the electrode sheet.
The method for manufacturing a power storage cell according to claim 1, wherein the forming step includes a coating step of coating the first main surface with an active material layer (12A), and a pressing step of pressing the active material layer coating the first main surface, and the disposing step is performed after the pressing step.
The method for manufacturing a power storage cell according to claim 1 or 2, further comprising a joining step of joining the first portion to the first surface, and joining the second portion to the second surface.
A power storage cell (100) comprising: a current collector plate (50A); and an electrode body (10) including an electrode sheet (10A) connected to the current collector plate, wherein the electrode sheet includes an insulation support layer (110), an electrode foil (111, 311), and an active material layer (12A) formed on the electrode foil, the active material layer is disposed opposite to the insulation support layer with respect to the electrode foil, the electrode foil has a first portion (111A) and a second portion (111B) arranged in a thickness direction of the insulation support layer, and a connecting portion (111C) that connects the first portion to the second portion, the first portion is disposed on a first surface (110A) of the insulation support layer provided at one end of the insulation support layer in the thickness direction, the second portion is disposed on a second surface (110B) of the insulation support layer opposite to the first surface, and assuming that a direction intersecting the thickness direction is defined as an intersecting direction, the connecting portion faces an end portion (110C) of the insulation support layer on a first direction side in the intersecting direction with a gap (Ga) therebetween in the intersecting direction.
The power storage cell according to claim 4, wherein the electrode foil includes an electrode surface (111E) provided opposite to the insulation support layer, the active material layer coats the electrode surface, and has a first active material portion (121) coating the first portion and a second active material portion (122) coating the second portion, assuming that a side of the intersecting direction opposite to the first direction is defined as a second direction, the first portion has a first protruding portion (91) protruding further toward the second direction than the first active material portion in the intersecting direction, and the second portion has a second protruding portion (92) protruding further toward the second direction than the second active material portion in the intersecting direction, and at least one of the first protruding portion and the second protruding portion is connected to the current collector plate.
The power storage cell according to claim 5, wherein an uncoated portion (124) not coated with the active material layer is formed on the connecting portion.
The power storage cell according to claim 6, wherein an insulating layer (124a) is formed on the uncoated portion.
The power storage cell according to any one of claims 5 to 7, wherein the active material layer includes a bent portion coating portion (323a, 323d) coating a bent portion (111C) of the electrode foil, the bent portion coating portion has an active material surface (123b, 323c, 323f) provided opposite to the electrode foil, and at least one of a hole (123f) and a notch (123a, 323b, 323e) is formed in the active material surface.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This nonprovisional application is based on Japanese Patent Application No. 2024-196711 filed on November 11, 2024 with the Japan Patent Office, the entire contents of which are hereby incorporated by reference. BACKGROUND Field The present disclosure relates to a method for manufacturing a power storage cell, and a power storage cell. Description of the Background Art Japanese Patent Laying-Open No. 2020-198290 discloses a cell including a composite current collector having an organic support layer and a conductive layer provided on the organic support layer. The above-referenced Japanese Patent Laying-Open No. 2020-198290 discloses an example in which the conductive layer is provided on each of a first surface and a second surface of the organic support layer that are arranged in a thickness direction thereof. The conductive layer provided on each of the first surface and the second surface is illustrated as being formed by physical vapor deposition (such as evaporation or sputtering). SUMMARY In the above-referenced Japanese Patent Laying-Open No. 2020-198290, the conductive layer (an electrode foil) is formed on each of the first surface and the second surface of the organic support layer (an insulation support layer) by physical vapor deposition, as described above. When forming a conductive layer by physical vapor deposition, it requires a relatively long time to grow the conductive layer, which may result in a longer time to manufacture an electrode sheet. Thus, it is desired to efficiently manufacture an electrode sheet having an electrode foil formed on both surfaces of an insulation support layer. The present disclosure has been made to solve the above-described problem, and an object of the present disclosure is to provide a method for manufacturing a power storage cell, and a power storage cell, that allow for efficient manufacture of an electrode sheet having an electrode foil provided on both surfaces of an insulation support layer. A method for manufacturing a power storage cell including an electrode sheet according to a first aspect of the present disclosure includes: a forming step of forming a sheet member including an electrode foil and an active material layer, the electrode foil including a first main surface and a second main surface, the active material layer being formed on the first main surface; a bending step of bending the sheet member; and a disposing step of disposing the second main surface of the bent electrode foil on an insulation support layer. The bending step includes bending the sheet member to thereby form, in the electrode foil, a first portion, a second portion arranged with the first portion in a thickness direction of the insulation support layer, and a connecting portion that connects the first portion to the second portion. Assuming that a direction intersecting the thickness direction is defined as an intersecting direction, one of the bending step and the disposing step includes (i) bringing a first surface of the insulation support layer provided at one end of the insulation support layer in the thickness direction into contact with the first portion, (ii) bringing a second surface of the insulation support layer opposite to the first surface into contact with the second portion, and (iii) causing an end portion of the insulation support layer in the intersecting direction to face the connecting portion in the intersecting direction, to thereby form the electrode sheet. A power storage cell according to a second aspect of the present disclosure includes: a current collector plate; and an electrode body including an electrode sheet connected to the current collector plate. The electrode sheet includes an insulation support layer, an electrode foil, and an active material layer formed on the electrode foil. The active material layer is disposed opposite to the insulation support layer with respect to the electrode foil. The electrode foil has a first portion and a second portion arranged in a thickness direction of the insulation support layer, and a connecting portion that connects the first portion to the second portion. The first portion is disposed on a first surface of the insulation support layer provided at one end of the insulation support layer in the thickness direction. The second portion is disposed on a second surface of the insulation support layer opposite to the first surface. Assuming that a direction intersecting the thickness direction is defined as an intersecting direction, the connecting portion faces an end portion of the insulation support layer on a first direction side in the intersecting direction with a gap therebetween in the intersecting direction. The foregoing and other objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of the present disclosure when taken in conjunction with the accompanying drawings. BRIEF