Apparatus and methods of determination of state of charge in a redox flow battery
First Claim
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1. A method for determining the state of charge of a redox flow cell battery, the redox flow cell battery comprising:
- at least one redox flow cell;
an electrolyte composition comprising one or more metal ions, wherein the metal ions go between an oxidized form and a reduced form during charging/discharging of the redox flow cell battery; and
at least one tank for holding the electrolyte composition, the tank coupled to the redox flow cell such that the tank supplies electrolyte composition to the redox flow cell during use,the method comprising;
providing one or more test samples of the electrolyte composition while electrolyte composition is flowed between the tank to the redox flow cell;
measuring an optical absorption of one or more of the test samples of the electrolyte composition;
comparing the optical absorption of the test sample with reference optical absorption measurements of the electrolyte composition in various states of charge to provide a relative absorptivity of the test sample; and
determining the state of charge of the redox flow cell battery from the relative absorptivity of the test sample.
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Abstract
Methods for determining the state of charge of an electrolyte solution in a redox battery by optical absorption spectrophotometry are disclosed. The state of charge thus obtained may serve as a gauge for the amount of electro-chemical energy left in the system.
111 Citations
18 Claims
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1. A method for determining the state of charge of a redox flow cell battery, the redox flow cell battery comprising:
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at least one redox flow cell; an electrolyte composition comprising one or more metal ions, wherein the metal ions go between an oxidized form and a reduced form during charging/discharging of the redox flow cell battery; and at least one tank for holding the electrolyte composition, the tank coupled to the redox flow cell such that the tank supplies electrolyte composition to the redox flow cell during use, the method comprising; providing one or more test samples of the electrolyte composition while electrolyte composition is flowed between the tank to the redox flow cell; measuring an optical absorption of one or more of the test samples of the electrolyte composition; comparing the optical absorption of the test sample with reference optical absorption measurements of the electrolyte composition in various states of charge to provide a relative absorptivity of the test sample; and determining the state of charge of the redox flow cell battery from the relative absorptivity of the test sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for determining the state of charge of a redox flow cell battery, the redox flow cell battery comprising:
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at least one redox flow cell comprising an anode half cell and a cathode half cell; an anolyte composition comprising chromium ions and iron ion, an anolyte tank holding the anolyte composition, wherein the anolyte tank is coupled to the anode half cell such that the tank supplies anolyte composition to the anode half cell during use; a catholyte composition; and an catholyte tank holding the catholyte composition, wherein the catholyte tank is coupled to the catholyte half cell such that the tank supplies catholyte composition to the catholyte half cell during use; the method comprising; providing one or more test samples of the anolyte composition and/or the catholyte composition; measuring an optical absorption of one or more of the test samples; comparing the optical absorption of one or more of the test samples with reference optical absorption measurements of the anolyte and/or catholyte composition in various states of charge to provide a relative absorptivity of one or more of the test samples; and determining the state of charge of the redox flow cell battery from the relative absorptivity of one or more test samples.
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Specification