Online monitoring device and method based on state of charge of flow battery

A flow battery, state of charge technology, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve problems such as inaccurate detection, and achieve the effects of safe charging and discharging, improved utilization, and improved performance

Pending Publication Date: 2021-05-28
大连融科储能装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the known open-circuit voltage-state-of-charge curve is only applicable when the state of the reference electrolyte is stable, that is, when the substances that are referenced with the positive and negative electrolytes are not polluted, if the electrode potential of the substance on the contrast side is changed, the detection will not be correct. precise

Method used

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  • Online monitoring device and method based on state of charge of flow battery
  • Online monitoring device and method based on state of charge of flow battery
  • Online monitoring device and method based on state of charge of flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In practical application, the liquid flow negative electrode half-cell 5 is connected with the battery negative electrode liquid outlet 1 and the battery negative electrode liquid inlet 2 respectively, and the liquid flow positive electrode half-cell 6 is connected with the battery positive electrode liquid inlet 3 and the battery positive electrode liquid outlet 4 respectively. The liquid flow positive electrode half-cell 6 sequentially passes through the liquid blocking rubber pad A13, the ionic membrane A10, the ionic membrane B11, and the ionic membrane C12, and the liquid blocking rubber pad B14 is connected with the reference detection chamber 7 of the flow battery. One end of the electrolyte outlet 8 communicates with the reference detection chamber 7 of the flow battery, and the other end communicates with the main pipeline 21 through the valve A24; on the other hand, one end of the reference electrolyte inlet 9 communicates with the reference detection chamber 7 ...

Embodiment 2

[0034] In practical applications, the following methods are used to monitor the state of charge of the flow battery online:

[0035] S1. Under normal conditions, ensure that valve A24, valve B25, valve C26, and valve D27 are closed;

[0036] S2. Initially add electrolyte of the same polarity as the flow positive half-cell 6 to the reference detection chamber 7 of the flow battery;

[0037] S3. When the battery starts to run, monitor the open circuit voltage between the electrode A17 and the electrode B18, and between the electrode B18 and the electrode C19 in real time;

[0038] S4. When the open circuit voltage between electrode B18 and electrode C19 is 0mV, open valve C26 and valve D27, close valve B25, and close valve C26 and valve D27 after running at a constant frequency for 1-10min. , electrolyte volume, flow, etc., choose the appropriate time to adjust;

[0039] S5. When the battery has been running for 1-3 months, perform battery calibration, that is, open valve D27,...

Embodiment 3

[0042]During the normal charging and discharging process of the battery, the actual SOC is measured by using the online monitoring device based on the state of charge of the flow battery and the conventional single battery to detect the SOC at regular intervals, and using the potentiometric titration method. The results are as follows: Table 1 shows:

[0043] Table 1 Comparison table between the method of the present invention, the single battery test method and the actual state of charge

[0044] this invention single battery potentiometric titration 1 4.15％ 1.25％ 4.31％ 2 25.12％ 21.12％ 24.67％ 3 51.37％ 54％ 52％ 4 76.31％ 80％ 75.13％ 5 95.12％ 100％ 94.8％ 6 85.15％ 90.2％ 85.67％ 7 64.15％ 60.5％ 65.89％ 8 32.5％ 30.4％ 31.25％ 9 4.2％ 0％ 5.6％

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Abstract

The invention belongs to the field of flow batteries, and discloses an online monitoring device and method based on the state of charge of a flow battery. The device comprises a battery negative electrode liquid inlet, a battery negative electrode liquid outlet, a battery positive electrode liquid inlet, a battery positive electrode liquid outlet, a liquid flow negative electrode half battery, a liquid flow positive electrode half battery, a liquid blocking rubber mat, an ionic membrane, a liquid flow battery reference detection cavity, a valve, a main pipeline and a liquid storage device. The method comprises the following steps of firstly, adding electrolyte which is homopolar with a liquid flow half battery into a reference detection cavity of the liquid flow battery, when the battery starts to run, monitoring open-circuit voltages between an electrode A and an electrode B and between the electrode B and an electrode C in real time, and respectively monitoring the state of charge of the electrolyte of the positive and negative electrodes to eliminate an open-circuit voltage difference value caused by permeation, and eliminating an open-circuit voltage difference value caused by valence state attenuation, so that real state of charge monitoring is realized. Therefore, the electrolyte utilization rate is improved, and the flow battery performance is improved; meanwhile, charging and discharging can be carried out more safely, and the service life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the field of liquid flow batteries, and relates to an online monitoring device and method based on the state of charge of a liquid flow battery. Background technique [0002] Flow battery electrolyte state of charge (SOC) online monitoring technology, currently applied technologies include: single battery open circuit voltage measurement method, battery charge and discharge charge transfer number and total charge transfer ratio method, battery charge / discharge capacity and total charge transfer method Charge / discharge ratio method, and currently monitor SOC based on physical properties of battery electrolyte, such as viscosity, conductivity, etc. At present, the single-cell open-circuit voltage (OCV) measurement method is widely used in production practice, that is, the open-circuit voltage value of the positive and negative electrolytes at both ends of the single-cell is monitored in real time, and the state of charge of the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04313H01M8/04537H01M8/18
CPCH01M8/04313H01M8/04544H01M8/04634H01M8/04604H01M8/188Y02E60/50
Inventor 叱干婷江杉王世宇徐广民鲁志颖汪平
Owner 大连融科储能装备有限公司
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