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Method for controlling valence state equilibrium of electrolyte in energy storage module of all-vanadium liquid flow battery

An all-vanadium redox flow battery, energy storage module technology, applied in fuel cells, electrolyte flow treatment, fuel cell additives, etc. Easy, lower labor cost, simple electrolysis operation

Inactive Publication Date: 2019-06-04
ZHANGJIAKOU WIND & SOLAR POWER ENERGY DEMONSTRATION STATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the electrolysis device is connected in series between the positive electrode electrolyte outlet and the positive electrode liquid storage tank,

Method used

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  • Method for controlling valence state equilibrium of electrolyte in energy storage module of all-vanadium liquid flow battery
  • Method for controlling valence state equilibrium of electrolyte in energy storage module of all-vanadium liquid flow battery
  • Method for controlling valence state equilibrium of electrolyte in energy storage module of all-vanadium liquid flow battery

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Embodiment 1

[0027] Example 1, see Figure 1 to Figure 2 :

[0028] The invention provides a method for controlling the balance of electrolyte valence state for an all-vanadium redox flow battery energy storage module: for a 100kW all-vanadium redox flow battery energy storage module, the overall valence state of the electrolyte is relatively high, and the valence state of the positive electrolyte is relatively high. The valence state of the negative electrode electrolyte is normal, and the positive electrode of the electrolyte valence state reduction device uses 2mol / L dilute sulfuric acid solution, and the negative electrode is connected to the main pipeline of the negative electrode electrolyte of the 100kW all-vanadium redox flow battery energy storage module, and bypasses the 100kW all-vanadium liquid flow battery energy storage module stack, and close the parallel part of the pipeline valve; when the energy storage module stops running, start the pump at the negative pole of the 100k...

Embodiment 2

[0032] The present invention provides a method for controlling the equilibrium valence state of an electrolyte for an all-vanadium redox flow battery energy storage module: for a 300kW all-vanadium redox flow battery energy storage module, the overall valence state of the electrolyte is relatively high, and the valence state of the positive pole is about 4.5. The valence state of the negative electrode is about 2.8. The positive electrode of the electrolyte valence state reduction device uses 4mol / L dilute sulfuric acid solution, and the negative electrode is connected to the main pipeline of the negative electrode electrolyte of the 300kW all-vanadium redox flow battery energy storage module, and bypasses the 300kW all-vanadium Flow battery energy storage module stack; start the 300kW all-vanadium redox flow battery energy storage module, and under the condition of the energy storage module, turn on the power supply of the electrolysis device for electrolysis; when the 300kW al...

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Abstract

The invention provides a method for controlling the valence state equilibrium of electrolyte in the energy storage module of an all-vanadium liquid flow battery. An electrolyte valence state reductiondevice is connected in parallel into a negative electrolyte pipeline, the valence state of electrolyte in the energy storage module of an all-vanadium liquid flow battery is reduced by electrolysis,and the electrolysis is stopped when the valence state reaches equilibrium. According to the invention, an electrolyte valence state reduction device is connected in parallel into a negative electrolyte pipeline, there is only the need to consume electric energy, there is no need to add other substances into the energy storage module, and the pump and the pipeline of the energy storage module arefully utilized. The method is simple and convenient to use and simple to operate, and can reduce labor cost compared with other methods. Meanwhile, online operation can be carried out, and the goal ofreducing the overall valence state of electrolyte in the energy storage module is achieved without stopping the operation of the energy storage module.

Description

technical field [0001] The invention relates to the technical field of liquid flow batteries, in particular to a method for balancing the valence state of an electrolytic solution of a vanadium battery. Background technique [0002] As an energy storage battery specially designed for large-scale power energy storage, all-vanadium redox flow battery has the advantages of independent design of power capacity, easy expansion, safe operation, long service life and recyclable electrolyte. One of the key links in the fields of distributed new energy access and smart grid. The all-vanadium redox flow energy storage battery uses vanadium ion solutions with different valence states as the active materials of the positive electrode and the negative electrode, and stores them in respective electrolyte storage tanks. The electrolyte is circulated by the pump through the external liquid storage tank and flows through the positive and negative chambers of the battery respectively, and ox...

Claims

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Application Information

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IPC IPC(8): H01M8/04186H01M8/04276H01M8/04694
CPCY02E60/50
Inventor 刘汉民杜涛马力张雁忠郑宇清秦源王权刁嘉
Owner ZHANGJIAKOU WIND & SOLAR POWER ENERGY DEMONSTRATION STATION CO LTD
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