Redox flow battery and method for producing a guide structure of an electrode element of a redox flow battery

Patent metadata

Field	Value
Publication number	US-11949138-B2
Application number	US-201916975623-A
Country	US
Kind code	B2
Filing date	Feb 21, 2019
Priority date	Feb 28, 2018
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

Various embodiments include a redox flow battery comprising: a cell divided into half-cells by a membrane; an electrolyte able to flow through the interior of the respective half-cell; an electrode; and a guide structure for guiding the electrolyte integrated into and defined by the associated electrode. Each half-cell comprises a current collector and an electrode element arranged in an interior of the respective half-cell.

First claim

What is claimed is:

1. A redox flow battery comprising:
A cell divided into half-cells by a membrane;
wherein each half-cell comprises a current collector and an electrode element arranged in an interior of the respective half-cell;
an electrolyte able to flow through the interior of the respective half-cell;
an electrode; and
a guide structure for guiding the electrolyte integrated into and defined by the associated electrode, wherein the guide structure includes multiple regions defined by different densities among the multiple regions and at least one of the multiple regions is defined by stitches in the guide structure.

2. The redox flow battery as claimed in claim 1 , wherein the electrode comprises a nonwoven and/or foam and/or mesh and/or braid and/or sponge.

3. The redox flow battery as claimed in claim 1 , wherein, by virtue of a shaped structure of the current collector in contact with the electrode, the density regions in the electrode are embossed by way of the shaped structure.

4. The redox flow battery as claimed in claim 1 , wherein the guide structure comprises a channel with an angular and/or round cross section.

5. The redox flow battery as claimed in claim 4 , wherein a cross-sectional area of the channel measured perpendicular to a direction of longitudinal extent of the channel changes.

6. The redox flow battery as claimed in claim 4 , wherein a boundary surface of the channel is at least partially congruent with a subregion of a surface of the electrode.

7. The redox flow battery as claimed in claim 4 , wherein the guide structure comprises a plurality of channels aligned substantially parallel to one another.

8. The redox flow battery as claimed in claim 7 , wherein adjacent channels each have a different cross-sectional area.

9. The redox flow battery as claimed in claim 7 , wherein adjacent channels are each arranged at a single distance from one another.

10. The redox flow battery as claimed in claim 7 , wherein a distance between respective adjacent channels increases or decreases in a first direction of the electrode.

11. The redox flow battery as claimed in claim 4 , wherein a plurality of channels meander with respect to one another and are at least partially connected directly to one another.

12. The redox flow battery as claimed in claim 1 , wherein the guide structure includes a diffuser channelling the electrolyte to or from the electrode.

13. A redox flow battery comprising:
a cell divided into half-cells by a membrane;
wherein each half-cell comprises a current collector and an electrode element arranged in an interior of the respective half-cell;
an electrolyte able to flow through the interior of the respective half-cell;
an electrode; and
a guide structure for guiding the electrolyte integrated into and defined by the associated electrode, wherein the guide structure includes multiple regions defined by different densities among the multiple regions;
wherein, by virtue of a shaped structure of the current collector in contact with the electrode, the density regions in the electrode are embossed by way of the shaped structure.

14. The redox flow battery as claimed in claim 13 , wherein the electrode comprises a nonwoven and/or foam and/or mesh and/or braid and/or sponge.

15. The redox flow battery as claimed in claim 13 , wherein the guide structure comprises a channel with an angular and/or round cross section.

16. The redox flow battery as claimed in claim 15 , wherein a cross-sectional area of the channel measured perpendicular to a direction of longitudinal extent of the channel changes.

17. The redox flow battery as claimed in claim 15 , wherein a boundary surface of the channel is at least partially congruent with a subregion of a surface of the electrode.

18. The redox flow battery as claimed in claim 15 , wherein the guide structure comprises a plurality of channels aligned substantially parallel to one another.

19. The redox flow battery as claimed in claim 18 , wherein adjacent channels each have a different cross-sectional area.

20. The redox flow battery as claimed in claim 18 , wherein adjacent channels are each arranged at a single distance from one another.

21. The redox flow battery as claimed in claim 18 , wherein a distance between respective adjacent channels increases or decreases in a first direction of the electrode.

22. A method for producing a guide structure of an electrode element of a redox flow battery, the battery including an electrode, the method comprising: integrating the guide structure into the electrode with additive manufacturing the electrode; casting the electrode with inserts and then burning out the inserts; and/or pressing the guide structure into the electrode wherein the guide structure includes multiple regions defined by different densities among the multiple regions and at least one of the multiple regions is defined by stitches in the guide structure.

Assignees

• Siemens Ag
• Litricity Gmbh

Inventors

• Fleck Robert
• Schricker Barbara
• Wolfschmidt Holger

Classifications

• H01M8/188 Primary

  by recharging of redox couples containing fluids; Redox flow type batteries · CPC title

• H01M8/04283

  Supply means of electrolyte to or in matrix-fuel cells · CPC title

• H01M8/1004

  characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence) · CPC title

• H01M8/18 Primary

  Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells · CPC title

• H01M4/86

  Inert electrodes with catalytic activity, e.g. for fuel cells · CPC title