Method for controlling operation of chemical flow battery

Patent metadata

Field	Value
Publication number	US-2020220186-A1
Application number	US-201615753617-A
Country	US
Kind code	A1
Filing date	Sep 21, 2016
Priority date	Sep 23, 2015
Publication date	Jul 9, 2020
Grant date	—

Abstract

A method for controlling driving of a chemical flow battery is disclosed. The method includes: measuring a concentration of bromine (Br2) in an electrolyte solution of a chemical flow battery after a complete discharge; and additionally supplying bromine (Br2) into the electrolyte solution until the concentration of bromine (Br2) satisfies a predefined condition.

First claim

What is claimed is:

1 . A method for controlling driving of a chemical flow battery, comprising:
measuring a concentration of bromine (Br2) in an electrolyte solution of a chemical flow battery after a complete discharge; and additionally supplying bromine (Br2) into the electrolyte solution until the concentration of bromine (Br2) satisfies a predefined condition.

2 . The method of claim 1 , wherein
the supplying includes additionally supplying the bromine (Br2) until the concentration of bromine (Br2) becomes to be equal to or greater than 0.05 M and equal to or less than 0.2 M.

3 . The method of claim 1 , wherein
the chemical flow battery includes a zinc-bromine (Br2) redox flow battery.

4 . A method for controlling driving of a chemical flow battery, comprising:
measuring an open circuit voltage (OCV) of an electrolyte solution of a chemical flow battery after discharging; measuring a concentration of bromine (Br2) in the electrolyte solution; and additionally supplying bromine (Br2) into the electrolyte solution when the open circuit voltage (OCV) is less than a predefined voltage reference value and the concentration of bromine (Br2) is less than a predefined concentration reference value.

5 . The method of claim 4 , wherein
the supplying includes additionally supplying the bromine (Br2) when the open circuit voltage (OCV) is less than 0.1 V/cell and the concentration of bromine (Br2) is less than 0.05 M.

6 . A method for controlling driving of a chemical flow battery, comprising:
measuring an open circuit voltage (OCV) of an electrolyte solution of a chemical flow battery after discharging; measuring a concentration of bromine (Br2) in the electrolyte solution; and additionally supplying bromine (Br2) into the electrolyte solution when the open circuit voltage (OCV) is equal to or greater than a predefined voltage reference value and the concentration of bromine (Br2) is less than a concentration reference value.

7 . The method of claim 6 , wherein
the supplying includes additionally supplying the bromine (Br2) when the open circuit voltage (OCV) is equal to or greater than 0.1 V/cell and the concentration of bromine (Br2) is less than 0.05 M.

8 . The method of claim 6 , further comprising,
after the supplying: performing multi-step low-current discharging; measuring an open circuit voltage (OCV) of an electrolyte solution of the chemical flow battery; measuring a concentration of bromine (Br2) in the electrolyte solution; and applying a reverse current when the open circuit voltage (OCV) is equal to or greater than a predefined voltage reference value and the concentration of bromine (Br2) is equal to or greater than a predefined concentration reference value.

9 . The method of claim 8 , wherein
the applying of a reverse current includes applying the reverse current when the open circuit voltage (OCV) is equal to or greater than 0.1 V/cell and the concentration of bromine (Br2) is equal to or greater than 0.2 M.

10 . The method of claim 8 , further comprising,
after the applying of a reverse current: performing multi-step low-current discharging; measuring an open circuit voltage (OCV) in an electrolyte solution of the chemical flow battery; determining whether the open circuit voltage (OCV) is equal to or less than a predefined voltage reference value; performing the applying of a reverse current when the open circuit voltage (OCV) is not equal to or less than the predefined voltage reference value; and finishing the step when the open circuit voltage (OCV) is equal to or less than the predefined voltage reference value.

11 . The method of claim 10 , wherein
the determining whether the open circuit voltage (OCV) is equal to or less than a predefined voltage reference value includes determining whether the open circuit voltage (OCV) is equal to or less than 0.1 V/cell.

12 . The method of claim 10 , wherein
the performing of multi-step current discharging includes establishing a current level range of the multi-step low-current discharge to be equal to or greater than 0.1% and equal to or less than 50% of a charging and discharging current range.

13 . The method of claim 10 , wherein
the applying of a reverse current includes applying a reverse current so that a current level range may be equal to or greater than 1 mAh/cm2 and equal to or less than 5 mAh/cm2 and a state of charge (SOC) may be equal to or greater than 5 and equal to or less than 15.

14 . The method of claim 10 , wherein
the chemical flow battery includes a zinc-bromine (Br2) redox flow battery.

Assignees

• Lotte Chemical Corp

Inventors

• Choi Eun Mi
• Bae Suyeon
• Kim Dae-Sik

Classifications

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• Y02E60/50

  Fuel cells · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M8/188

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

• H01M12/085

  Zinc-halogen cells or batteries · CPC title