Redox flow battery and battery system

Patent metadata

Field	Value
Publication number	US-11710843-B2
Application number	US-202117308862-A
Country	US
Kind code	B2
Filing date	May 5, 2021
Priority date	May 15, 2020
Publication date	Jul 25, 2023
Grant date	Jul 25, 2023

Abstract

A redox flow battery and battery system are provided. In one example, the redox flow battery includes a cell stack assembly interposed by two endplates and comprising a plurality of mated membrane frame plates and bipolar frame plates forming, at a mated interface, a plurality of negative and positive flow channels configured to distribute negative and positive electrolyte into a plurality of bipolar plates. In the battery a membrane is coupled to each of the plurality of membrane frame plates and positioned sequentially between two of the bipolar plates included in the plurality of bipolar plates.

First claim

The invention claimed is:

1. A redox flow battery comprising:
a cell stack assembly interposed by two endplates, the cell stack assembly comprising:
a plurality of mated membrane frame plates and bipolar frame plates forming, at a mated interface, a plurality of negative and positive flow channels configured to distribute negative and positive electrolyte into a plurality of bipolar plates,

where a membrane is coupled to each of the plurality of mated membrane frame plates and positioned sequentially between two bipolar plates included in the plurality of bipolar plates, and
where the cell stack assembly further comprises a reinforcing mesh positioned between sequential bipolar plates and membranes.

2. The redox flow battery of claim 1 , where the reinforcing mesh includes a plurality of ribs distributing compressive forces through the plurality of bipolar plates and the membranes.

3. The redox flow battery of claim 1 , where each of the plurality of bipolar frame plates and the mated membrane frame plates include at least two alignment bosses positioned on laterally opposing sides of the corresponding frame plate.

4. The redox flow battery of claim 1 , where an adhesive interface is formed between mated tongues and grooves in the mated interface of each pair of membrane and bipolar frame plates and where the adhesive interface demarcates the negative and positive flow channels.

5. The redox flow battery of claim 4 , where the adhesive interface includes adhesively filled gaps on opposing sides of the mated grooves.

6. The redox flow battery of claim 1 , where an aspect ratio of the plurality of mated membrane frame plates is greater than 1:3.

7. The redox flow battery of claim 1 , where the membranes are heat welded to the plurality of mated membrane frame plates.

8. The redox flow battery of claim 1 , where the plurality of mated membrane frame plates and bipolar frame plates each include openings in peripheral tabs configured to receive compression bolts.

9. The redox flow battery of claim 1 , where the cell stack assembly includes at least one visible alphanumeric part indicator on an exterior surface of the cell stack assembly.

10. The redox flow battery of claim 1 , where the reinforcing mesh includes a plurality of ribs and a plurality of cross-bracings extending between the plurality of ribs.

11. The redox flow battery of claim 1 , where the plurality of mated membrane frame plates and bipolar frame plates include at least a first membrane frame plate mated to a first bipolar frame plate, and where at least one of the negative and/or positive flow channels is bounded by the mated first bipolar frame plate and first membrane frame plate.

12. A redox flow battery comprising:
a cell stack assembly interposed by two endplates, the cell stack assembly comprising:
a plurality of mated membrane frame plates and bipolar frame plates forming, at a mated interface, a plurality of negative and positive flow channels configured to distribute negative and positive electrolyte into a plurality of bipolar plates;

where a membrane is coupled to each of the plurality of mated membrane frame plates;
where at least one bipolar plate is coupled to each of the plurality of bipolar frame plates; and
where a reinforcing mesh is positioned between one or more sequential bipolar plates and membranes, and where the reinforcing mesh includes a plurality of ribs and a plurality of cross-bracings extending between the plurality of ribs.

13. The redox flow battery of claim 12 , where the plurality of ribs interface with recesses in an adjacent bipolar plate.

14. The redox flow battery of claim 13 , where the mated interface includes adhesive paths bonding the membrane frame plate to the bipolar frame plate, and where the mated interface includes mated tongues and grooves.

15. The redox flow battery of claim 12 , where an aspect ratio of the plurality of mated membrane frame plates is greater than 1:3.

16. The redox flow battery of claim 12 , where the membranes are heat welded to the plurality of mated membrane frame plates.

17. A redox flow battery comprising:
a cell stack assembly interposed by two endplates, the cell stack assembly comprising:
a plurality of mated membrane frame plates and bipolar frame plates forming, at a mated interface, a plurality of negative and positive flow channels distributing negative and positive electrolyte into a plurality of bipolar plates;

where a membrane is coupled to each of the plurality of mated membrane frame plates;
where at least one bipolar plate is coupled to each of the plurality of bipolar frame plates; and
where a reinforcing mesh is positioned between one or more sequential bipolar plates and membranes and configured to structurally reinforce an adjacent bipolar plate and membrane, and where the reinforcing mesh includes a plurality of ribs and a plurality of cross-bracings extending between the plurality of ribs.

18. The redox flow battery of claim 17 , where the plurality of negative and positive flow channels are bounded by mated tongues and grooves and adhesive paths.

19. The redox flow battery of claim 17 , where an aspect ratio of the plurality of mated membrane frame plates is greater than 1:3, and where the membranes are heat welded to the plurality of mated membrane frame plates.

Assignees

• Ess Technology Inc

Inventors

• Evans Craig E
• Casey Sean
• Groberg Thiago
• Song Yang

Classifications

• H01M8/188 Primary

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

• H01M8/2455

  with liquid, solid or electrolyte-charged reactants · CPC title

• Y02E60/50

  Fuel cells · CPC title

• H01M8/0258

  characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant · CPC title

• H01M8/0273

  with sealing or supporting means in the form of a frame · CPC title