Real-time monitoring, regulating and controlling method for attenuation of energy storage medium of flow battery

An energy storage medium and real-time monitoring technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve problems such as labor-intensive and cumbersome steps

Pending Publication Date: 2021-05-14
大连融科储能装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the cumbersome technical steps of real-time monitoring and regulation of the attenuation state of the electrolyte capacity of the existing flow battery, t

Method used

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  • Real-time monitoring, regulating and controlling method for attenuation of energy storage medium of flow battery
  • Real-time monitoring, regulating and controlling method for attenuation of energy storage medium of flow battery
  • Real-time monitoring, regulating and controlling method for attenuation of energy storage medium of flow battery

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Effect test

Embodiment 1

[0033] A 10kW, 40kWh, all-vanadium redox flow battery energy storage system is used for system testing, and the above monitoring method is applied to this system. The system tests the permeation decay rate, and the result of the test valence decay rate is consistent with the actual measured permeability and potentiometric titration method. The comparison of the actual attenuation rate is not much different from the actual measurement results, which proves that this method is feasible, and the results are shown in Table 1:

[0034] Table 1: 10kW system test penetration attenuation rate, valence attenuation rate and actual offline test comparison table

[0035]

[0036] The total molar mass of the positive and negative electrolytes used in the above system is 3300M. This system is used for charging and discharging. When the system runs to a cycle number of 3, at a certain moment of charging or discharging, this embodiment takes charging as an example to record the battery Sys...

Embodiment 2

[0038] A 250kW, 500kWh, all-vanadium redox flow battery energy storage system is used for system testing, and the above monitoring method is applied to this system. The system tests the permeation decay rate, and the result of the test valence decay rate is consistent with the actual measured permeability and potentiometric titration method. The comparison of the actual attenuation rate is not much different from the actual measurement results, which proves that this method is feasible, and the results are shown in Table 2:

[0039] Table 2: 250kW system test penetration attenuation rate, valence state attenuation rate and actual offline test comparison table

[0040]

[0041] The total molar mass of the positive and negative electrolytes used in the above system is 49500M. This system is used for charging and discharging. When the system runs to a cycle number of 5, at a certain moment of charging or discharging, this embodiment takes discharging as an example to record the...

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Abstract

The invention belongs to the field of flow batteries, and discloses a real-time monitoring, regulating and controlling method for attenuation of an energy storage medium of a flow battery. The method comprises the following steps: calculating the total amount of substances, capable of participating in electrochemical reaction, of positive and negative electrolytes before battery operation, and recording the total amount as Mtotal; presetting the maximum value P1max of the permeability attenuation rate and the maximum value P2max of the average valence attenuation rate; according to the total molar weight of the positive electrode and the negative electrodes in the initial state, the real-time SOC of the positive electrode and the negative electrode and the real-time charging and discharging amount Q, calculating the real-time molar content of the positive electrode electrolyte and the negative electrode electrolyte, and then monitoring the attenuation amount of the positive electrode electrolyte and the negative electrode electrolyte, the attenuation amount comprising the permeability attenuation rate P1 and the average valence attenuation rate P2, when the actual permeability attenuation rate P1r is larger than P1max, performing adjusting operation, enabling P1 to be equal to 0, and when P2r is larger than P2max, carrying out valence state recovery operation. According to the invention, through online real-time monitoring of the electrolyte state, automatic online monitoring and adjustment can be realized, the labor cost is saved, the tedious process is avoided, and the valence attenuation and the volume attenuation in the operation process of the battery can be accurately measured online.

Description

technical field [0001] The invention belongs to the field of liquid flow batteries, and relates to a method for real-time monitoring and regulation of the attenuation of an energy storage medium of a liquid flow battery. Background technique [0002] Existing real-time monitoring and control technology of electrolyte capacity attenuation of flow battery, wherein the technical method of monitoring electrolyte attenuation is to judge the attenuation of electrolyte capacity through multi-cycle charging and discharging, and the reduction of charge and discharge capacity; there is also a real-time sampling method Determine the current attenuation of the electrolyte. [0003] Patent No. CN107195932 Chinese patent "Flow battery capacity stabilization control method, system and flow battery", using the charge and discharge capacity comparison method, that is, setting the maximum charge or discharge capacity Q of a battery max , there will be an actual charge or discharge amount Q a...

Claims

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Application Information

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IPC IPC(8): H01M8/04537H01M8/04858H01M8/04992H01M8/18
CPCH01M8/04992H01M8/04611H01M8/04951H01M8/188Y02E60/50
Inventor 叱干婷江杉王良鲁志颖张雅薇李超
Owner 大连融科储能装备有限公司
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