# US 2020/0403262 A1 · Cell stack and redox flow battery

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- Number: US 2020/0403262 A1
- Document ID: US20200403262A1
- Status: Published application
- Kind: A1
- Application number: 16/970,981
- Filed: 2018-02-27
- Published: 2020-12-24
- Earliest claimed: 2018-02-27
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Hayato FUJITA; Kenji MOTOI; Takashi KANNO; Takeshi YAMANA
- Web page: https://patentgrep.com/patent/US20200403262A1

## CPC

- H01M 8/188: {by recharging of redox couples containing fluids; Redox flow type batteries}
- H01M 8/2455: with liquid, solid or electrolyte-charged reactants
- H01M 8/2465: Details of groupings of fuel cells
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A cell stack including; a stacked body including a plurality of cell frames each having a bipolar plate whose outer periphery is supported by a frame member; and a pair of end plates that tighten the stacked body from both sides of a stacking direction thereof, wherein an area S [cm2] of each cell frame as viewed from the stacking direction of the stacked body and a length W [mm] in the stacking direction of the stacked body satisfies a relationship 0.05≤W/S≤0.9.

## Claims

### Claim 1

A cell stack comprising:
a stacked body including a plurality of cell frames each having a bipolar plate whose outer periphery is supported by a frame member; and
a pair of end plates that tighten the stacked body from both sides of a stacking direction thereof,
wherein an area S cm2 of each cell frame as viewed from the stacking direction of the stacked body and a length W mm in the stacking direction of the stacked body satisfies a relationship 0.05≤W/S≤0.9.

### Claim 2 (depends on 1)

The cell stack according to claim 1, wherein the W is 1800 mm or less.

### Claim 3 (depends on 1)

The cell stack according to claim 1, wherein the S is 10000 cm2 or less.

### Claim 4 (depends on 1)

The cell stack according to claim 1,
wherein the frame member of each cell frame includes a frame facing surface that faces a frame member of another cell frame adjacent to the cell frame in the stacking direction, and
a surface roughness Ra of the frame facing surfaces is 0.03 μm or more and 3.2 μm or less.

### Claim 5 (depends on 1)

The cell stack according to claim 1,
wherein the frame member has an outer peripheral portion with a predetermined width including an outer peripheral end portion, and
the outer peripheral portion includes a thin region whose thickness gradually decreases from a center of the frame member toward the outer peripheral end portion.

### Claim 6 (depends on 5)

The cell stack according to claim 5, wherein, in a cross-section along a thickness direction of the frame member, a cross-sectional shape of the thin region is any one of a pencil-down shape, an R-chamfered shape, and a C-chamfered shape.

### Claim 7 (depends on 1)

The cell stack according to claim 1,
wherein the frame member has a thickness along an axial direction of the frame member, and a length and a width orthogonal to the axial direction and extending at a right angle with each other, and
the thickness is shorter than the length and shorter than the width.

### Claim 8 (depends on 7)

The cell stack according to claim 7, wherein the length of the frame member is longer than the width of the frame member.

### Claim 9 (depends on 7)

The cell stack according to claim 7, wherein the length of the frame member is shorter than the width of the frame member.

### Claim 10 (depends on 7)

The cell stack according to claim 7, wherein the thickness of the frame member is 3 mm or more and 10 mm or less.

### Claim 11 (depends on 1)

The cell stack according to claim 1,
wherein, when a pair of the cell frames that are adjacent to each other in the stacking direction are respectively taken as a first cell frame and a second cell frame, and a combination of the first cell frame and the second cell frame is taken as a cell frame pair,
in the cell frame pair,
an outer peripheral end portion of the frame member included in the first cell frame is shifted from an outer peripheral end portion of the frame member included in the second cell frame, in a direction that intersects the stacking direction, by 0.5 mm or more and 20 mm or less.

### Claim 12 (depends on 1)

A redox flow battery comprising the cell stack according to claim 1.