Cavern battery bank

1. A battery bank for a redox flow battery, comprising:

a cavity in which electrolyte is stored, wherein the electrolyte is provided for supply to one or more redox flow cells, wherein the cavity is a salt dome cavern and wherein the electrolyte comprises brine and polymer.

2. The battery bank as claimed in claim 1 , wherein the cavity has a volume in an inclusive range from 70,000 m 3 to 500,000 m 3 .

3. A redox flow battery comprising:

one or more redox flow cells; and

at least two battery banks for supplying the one or more redox flow cells with electrolyte, wherein at least one of the at least two battery banks comprises a cavity in which the electrolyte is stored, wherein the cavity is a salt dome cavern and wherein the electrolyte comprises brine and polymer.

4. The redox flow battery as claimed in claim 3 , wherein at least two of the at least two battery banks each comprises a cavity in which a respective electrolyte is stored, wherein each cavity is a salt dome cavern.

5. The redox flow battery as claimed in claim 3 , wherein a first pipe string and a second pipe string for supplying and withdrawing electrolyte open into the salt dome cavern, wherein the first and the second pipe strings are nested in one another, wherein one end of the first pipe string is associated with a cavern floor of the salt dome cavern and one end of the second pipe string is associated with a cavern roof of the salt dome cavern.

6. The redox flow battery as claimed in claim 3 , wherein

a plurality of redox flow cells are provided, wherein the redox flow cells are arranged in a cascade system,

and/or

the redox flow battery has a capacity in an inclusive range from 12.5 to 25 gigawatt hours (GWh).

7. A method for producing at least one battery bank for a redox flow battery, comprising:

disposing a first electrolyte in a first cavity for storing electrolyte, wherein the first cavity is a first salt dome cavern and wherein the first electrolyte comprises brine and polymer.

8. Use of a cavern as a battery bank for accommodating electrolyte for a redox flow battery, wherein the cavern is a salt dome cavern and wherein the electrolyte comprises brine and polymer.

9. The battery bank as claimed in claim 1 , wherein the polymer is a liquid polymer.

10. The redox flow battery as claimed in claim 3 , wherein the at least two battery banks for supplying the one or more redox flow cells with electrolyte consists of two battery banks for supplying the one or more redox flow cells with electrolyte, wherein the two battery banks each comprise a cavity in which a respective electrolyte is storted, wherein each cavity is a salt dome cavern.

11. The battery bank as claimed in claim 1 , wherein the cavity has a volume in an inclusive range from 500,000 m 3 to 800,000 m 3 .

12. The battery bank as claimed in claim 1 , wherein the cavity has a volume in an inclusive range from 100,000 m 3 to 1,000,000 m 3 .

13. The battery as claimed in claim 3 , wherein the cavity has a volume in an inclusive range from 100,000 m 3 to 1,000,000 m 3 .

14. The battery as claimed in claim 4 , wherein each cavity has a volume in an inclusive range from 100,000 m 3 to 1,000,000 m 3 .

15. The method as claimed in claim 7 , wherein the first cavity has a volume in an inclusive range from 100,000 m 3 to 1,000,000 m 3 .

16. The method as claimed in claim 7 , further comprising:

disposing a second electrolyte in a second cavity for storing electrolyte, wherein the second cavity is a second salt dome cavern.

17. The method as claimed in claim 16 , wherein the second cavity has a volume in an inclusive range from 100,000 m 3 to 1,000,000 m 3 .

18. The method as claimed in claim 16 , wherein the second electrolyte comprises brine and polymer.

19. The use of a cavern as claimed in claim 8 , wherein the cavern has a volume in an inclusive range from 100,000 m 3 to 1,000,000 m 3 .