CN105572594B - Flow battery system state-of-charge monitoring method and its system - Google Patents

Flow battery system state-of-charge monitoring method and its system Download PDF

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Publication number
CN105572594B
CN105572594B CN201410613631.0A CN201410613631A CN105572594B CN 105572594 B CN105572594 B CN 105572594B CN 201410613631 A CN201410613631 A CN 201410613631A CN 105572594 B CN105572594 B CN 105572594B
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soc
pile
electrolyte
always
flow battery
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CN105572594A (en
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张宇
张华民
邹毅
李颖
王晓丽
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Dalian Rongke Power Co Ltd
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Dalian Rongke Power Co Ltd
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Priority to EP17173863.6A priority patent/EP3246720B1/en
Priority to EP19208348.3A priority patent/EP3627168B1/en
Priority to AU2015342321A priority patent/AU2015342321B2/en
Priority to PCT/CN2015/093707 priority patent/WO2016070794A1/en
Priority to JP2017542255A priority patent/JP6491347B2/en
Priority to EP15856903.8A priority patent/EP3214455B1/en
Publication of CN105572594A publication Critical patent/CN105572594A/en
Priority to US15/585,970 priority patent/US10424797B2/en
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Abstract

The invention discloses a kind of flow battery system state-of-charge monitoring method and its system, the monitoring method includes the steps of determining that the SOC of at least two pairs different monitoring positions;Any pair of monitoring position are as follows: in anolyte liquid storage tank and in cathode electrolyte storage tank, in the anode electrolyte export pipeline of pile and in the electrolyte liquid export pipeline of pile or in the anode electrolyte entrance pipe of pile and in the electrolyte liquid entrance pipe of pile;According to each SOC corresponding to monitoring position, flow battery system state-of-charge SOC is obtainedAlways;The present invention has the advantages that accurate comprehensive, convenient for knowing flow battery system difference monitoring position in real time the state-of-charge of monitoring.

Description

Flow battery system state-of-charge monitoring method and its system
Technical field
The invention belongs to flow battery technology field, specially a kind of flow battery system state-of-charge monitoring method and its System.
Background technique
Flow battery due to it with the long-life, highly-safe, super-charge super-discharge ability is strong, advantages of environment protection becomes big One of the ideal chose of scale energy storage, main application market include renewable energy power station and user side intelligent micro-grid (resident Area, industrial area, communal facility) etc., correspondingly, flow battery system may be implemented paddy electricity peak use, balanced load and improve electric energy The multiple functions such as quality.
State-of-charge (SOC) is the parameter for embodying battery electric quantity state, is that battery system realizes accurate control and management Most direct basis and mostly important one of the parameter of flow battery, in real time accurately state-of-charge for guaranteeing battery system High reliability operation, raising battery using effect and extension battery life have vital effect.
Real-time voltage of the state-of-charge (SOC) of flow battery mainly by monitoring anode electrolyte and electrolyte liquid is poor Know, since the voltage difference and concentration of electrolyte have a direct relation, flow battery system during the work time, positive and negative anodes electrolysis Electrolyte in liquid storage tank flows through electrolyte circulation line and pile under the promotion of circulating pump, and it is anti-that electrochemistry occurs in pile It answers, the active material concentration of the electrolyte entered in pile is made to change, then electrolyte is stored up back to positive and negative anodes electrolyte It in tank, is mixed with the electrolyte in storage tank, therefore the voltage difference of the positive and negative anodes electrolyte of flow battery different location is different, Therefore in flow battery any position such as pile import, pile outlet and positive and negative anodes electrolyte storage tank electrolyte voltage difference It cannot directly reflect the real-time state-of-charge (SOC) of flow battery;Flow battery system state-of-charge in the prior art It is usually monitored by the positive and negative anodes electrolyte voltage difference of the single position of flow battery, to react the charged of entire flow battery system State (SOC), the technical solution as disclosed in the Chinese patent application No. is 200910088258.0 are measurement in pipe-line system The voltage difference of middle positive and negative anodes electrolyte makees the real-time state-of-charge (SOC) of flow battery, and application No. is 201010172477.X's Technical solution disclosed in Chinese patent is to be monitored in storage tank by way of placing reference electrode in electrolyte storage tank Electrolyte voltage difference situation, and then the real-time state-of-charge (SOC) as flow battery;In addition, the charged shape of flow battery system The monitoring and calculating of state (SOC) are also related with the different phase of power/capacity configuration of flow battery system and charge and discharge, It is simply handled according to unified standard, cannot integrate and comprehensively monitor and calculate in real time accurately state-of-charge (SOC).
Summary of the invention
The it is proposed of the present invention in view of the above problems, and develop a kind of flow battery system state-of-charge monitoring method and its be System.
Technological means of the invention is as follows:
A kind of flow battery system state-of-charge monitoring method, the flow battery system include pile, anode electrolyte Storage tank, cathode electrolyte storage tank and electrolyte circulation line;The monitoring method includes the following steps:
Step 1: determining the SOC of at least two pairs different monitoring positions;Any pair of monitoring position are as follows: in anolyte liquid storage tank With in cathode electrolyte storage tank, in the anode electrolyte export pipeline of pile and in the electrolyte liquid export pipeline of pile or In the anode electrolyte entrance pipe of person's pile and in the electrolyte liquid entrance pipe of pile;
Step 2: according to each SOC corresponding to monitoring position, obtaining flow battery system state-of-charge SOCAlways
Further, when monitoring position to being 3, the step 2 specifically:
Utilize formula S OCAlways=A × SOCa+B×SOCb+C×SOCcObtain flow battery system state-of-charge SOCAlways, wherein A, B, C are coefficient, A+B+C=1, SOCaFor in corresponding monitoring position anolyte liquid storage tank and in cathode electrolyte storage tank SOC、SOCbFor in the anode electrolyte export pipeline of corresponding monitoring position pile and in the electrolyte liquid export pipeline of pile SOC, SOCcFor the electrolyte liquid entrance pipe in the anode electrolyte entrance pipe of corresponding monitoring position pile with pile In SOC;
Further, when monitoring position to being 2, the step 2 specifically:
Utilize formula S OCAlways=A × SOCa+B×SOCb、SOCAlways=A × SOCa+C×SOCcOr SOCAlways=B × SOCb+C ×SOCcObtain flow battery system state-of-charge SOCAlways, wherein A, B, C are that the sum of coefficient, each coefficient in each formula are equal to 1, SOCaFor SOC, SOC in corresponding monitoring position anolyte liquid storage tank and in cathode electrolyte storage tankbPosition is monitored to be corresponding SOC, SOC in the anode electrolyte export pipeline of pile and in the electrolyte liquid export pipeline of pilecPosition is monitored to be corresponding Set the SOC in the anode electrolyte entrance pipe of pile and in the electrolyte liquid entrance pipe of pile;
Further, also there are following steps before step 2:
According to the ratio result of the power of flow battery system and capacity come configuration coefficients A, B, C;
Further, described according to the power of flow battery system and the ratio result of capacity when monitoring position to being 3 The step of carrying out configuration coefficients A, B, C specifically:
It is to execute step 1. whether the ratio of the power and capacity that judge flow battery system is more than or equal to the first preset value Suddenly 2., no to then follow the steps 3.;
2. configuring 0.1≤A≤0.3,0.5≤B≤0.8,0.1≤C≤0.3, step 3 is executed;
It is to then follow the steps 3. whether the ratio of the power and capacity that judge flow battery system is less than the second preset value 4. 5. no then follow the steps;
4. configuring 0.1≤A≤0.3,0.1≤B≤0.3,0.5≤C≤0.8, step 3 is executed;
5. passing through SOC?=(SOCa+SOCb+SOCc)/3 obtain each SOC average value SOC to monitoring position?, execute step ⑥;
6. as 0 < SOC?≤ 20%, configuration 0.1≤A≤0.33,0.33≤B≤0.6 and 0.1≤C≤0.33 execute Step 3;
As 20% < SOC?≤ 80%, A=B=C is configured, step 3 is executed;
As 80% < SOC?< 100%, configuration 0.1≤A≤0.33,0.1≤B≤0.33 and 0.33≤C≤0.6, holds Row step 3;
Further, described according to the power of flow battery system and the ratio result of capacity when monitoring position to being 2 The step of carrying out configuration coefficients A, B, C specifically:
Whether the ratio of I, the power for judging flow battery system and capacity is more than or equal to the first preset value, is, executes step Rapid II, it is no to then follow the steps III;
II, for formula S OCAlways=A × SOCa+B×SOCb, 0.1≤A≤0.3,0.7≤B≤0.9 are configured, step is executed 3;
For formula S OCAlways=A × SOCa+C×SOCc, 0.4≤A≤0.5,0.5≤C≤0.6 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.7≤B≤0.9,0.1≤C≤0.3 are configured, step 3 is executed;
Whether the ratio of III, the power for judging flow battery system and capacity is to then follow the steps less than the second preset value IV, it is no to then follow the steps V;
IV, for formula S OCAlways=A × SOCa+B×SOCb, 0.4≤A≤0.5,0.5≤B≤0.6 are configured, step is executed 3;
For formula S OCAlways=A × SOCa+C×SOCc, 0.1≤A≤0.3,0.7≤C≤0.9 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.1≤B≤0.3,0.7≤C≤0.9 are configured, step 3 is executed;
V passes through SOCIt is flat=(SOCa+SOCb)/2、SOCIt is flat=(SOCa+SOCc)/2 or SOCIt is flat=(SOCb+SOCc)/2 obtain The SOC average value SOC of any 2 pairs of monitorings positionIt is flat, execute step VI;
VI, as 0 < SOCIt is flatWhen≤20%:
For formula S OCAlways=A × SOCa+B×SOCb, 0.2≤A≤0.5,0.5≤B≤0.8 are configured, step 3 is executed;
For formula S OCAlways=A × SOCa+C×SOCc, 0.4≤A≤0.5,0.5≤C≤0.6 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.5≤B≤0.8,0.2≤C≤0.5 are configured, step 3 is executed;
As 20% < SOCIt is flatWhen≤80%, A=B=C is configured;
As 80% < SOCIt is flatWhen < 100%:
For formula S OCAlways=A × SOCa+B×SOCb, 0.4≤A≤0.5,0.5≤B≤0.6 are configured, step 3 is executed;
For formula S OCAlways=A × SOCa+C×SOCc, 0.2≤A≤0.5,0.5≤C≤0.8 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.2≤B≤0.5,0.5≤C≤0.8 are configured, step 3 is executed.
A kind of flow battery system state-of-charge monitoring system, the flow battery system includes pile, anode electrolyte Storage tank, cathode electrolyte storage tank and electrolyte circulation line, the monitoring system include:
Determine the monitoring device of the SOC of at least two pairs different monitoring positions;Any pair of monitoring position are as follows: anode electrolyte storage In tank and in cathode electrolyte storage tank, on the anode electrolyte export pipeline of pile and the electrolyte liquid export pipeline of pile On the upper or anode electrolyte entrance pipe of pile and on the electrolyte liquid entrance pipe of pile;
Further, the monitoring system further includes connection monitoring device, for being respectively corresponded according to each to monitoring position SOC, obtain flow battery system state-of-charge SOCAlwaysSOC obtain module;
Further, when monitoring position to being 3, the SOC obtains module and utilizes formula S OCAlways=A × SOCa+B× SOCb+C×SOCcObtain flow battery system state-of-charge SOCAlways, wherein A, B, C are coefficient, A+B+C=1, SOCaFor corresponding prison Location sets SOC, SOC in anolyte liquid storage tank and in cathode electrolyte storage tankbFor the anode electricity of corresponding monitoring position pile Solve SOC, SOC in liquid export pipeline and in the electrolyte liquid export pipeline of pilecFor the anode of corresponding monitoring position pile SOC in electrolyte entrance pipeline and in the electrolyte liquid entrance pipe of pile;
Further, when monitoring position to being 2, the SOC obtains module and utilizes formula S OCAlways=A × SOCa+B× SOCb、SOCAlways=A × SOCa+C×SOCcOr SOCAlways=B × SOCb+C×SOCcObtain flow battery system state-of-charge SOCAlways, wherein A, B, C are that the sum of coefficient, each coefficient in each formula are equal to 1, SOCaPosition anode electrolyte is monitored to be corresponding SOC, SOC in storage tank and in cathode electrolyte storage tankbAnode electrolyte export pipeline for corresponding monitoring position pile neutralizes SOC, SOC in the electrolyte liquid export pipeline of pilecIn anode electrolyte entrance pipe for corresponding monitoring position pile With the SOC in the electrolyte liquid entrance pipe of pile.
By adopting the above-described technical solution, flow battery system state-of-charge monitoring method provided by the invention and its being System by the state-of-charge of the multiple monitoring positions of comprehensive flow battery system, and then obtains flow battery system state-of-charge, makes State-of-charge (SOC) monitoring result closer to actual value, have monitoring it is accurate comprehensively, convenient for knowing liquid stream electricity in real time Cell system difference monitors the characteristics of state-of-charge of position, realizes the redundancy of SOC measurement;Also, work as some monitoring positions When set monitoring device breaks down, the monitoring result for obtaining state-of-charge precisely in real time is still ensured that, to be conducive to The service efficiency for improving flow battery, extends the service life of battery, accurately manages flow battery system.
Detailed description of the invention
Fig. 1 is the flow chart of monitoring method of the present invention;
Fig. 2 is the structural schematic diagram of monitoring system of the present invention.
In figure: 1, pile, 2, anolyte liquid storage tank, 3, cathode electrolyte storage tank, 4, potential monitoring device, 5, circulation Pump, 6, the anode electrolyte export pipeline of pile, 7, the electrolyte liquid export pipeline of pile, 8, the anode electrolyte of pile enters Mouthful pipeline, 9, the electrolyte liquid entrance pipe of pile, 10, SOC obtain module;41, the first potential monitoring module, 42, second Potential monitoring module, 43, potential difference acquisition module.
Specific embodiment
A kind of flow battery system state-of-charge monitoring method as shown in Figure 1, the flow battery system include pile, Anolyte liquid storage tank, cathode electrolyte storage tank and electrolyte circulation line;The monitoring method includes the following steps:
Step 1: determining the SOC of at least two pairs different monitoring positions;Any pair of monitoring position are as follows: in anolyte liquid storage tank With in cathode electrolyte storage tank, in the anode electrolyte export pipeline of pile and in the electrolyte liquid export pipeline of pile or In the anode electrolyte entrance pipe of person's pile and in the electrolyte liquid entrance pipe of pile;
Step 2: according to each SOC corresponding to monitoring position, obtaining flow battery system state-of-charge SOCAlways
Further, when monitoring position to being 3, the step 2 specifically:
Utilize formula S OCAlways=A × SOCa+B×SOCb+C×SOCcObtain flow battery system state-of-charge SOCAlways, wherein A, B, C are coefficient, A+B+C=1, SOCaFor in corresponding monitoring position anolyte liquid storage tank and in cathode electrolyte storage tank SOC、SOCbFor in the anode electrolyte export pipeline of corresponding monitoring position pile and in the electrolyte liquid export pipeline of pile SOC, SOCcFor the electrolyte liquid entrance pipe in the anode electrolyte entrance pipe of corresponding monitoring position pile with pile In SOC;
Further, when monitoring position to being 2, the step 2 specifically:
Utilize formula S OCAlways=A × SOCa+B×SOCb、SOCAlways=A × SOCa+C×SOCcOr SOCAlways=B × SOCb+C ×SOCcObtain flow battery system state-of-charge SOCAlways, wherein A, B, C are that the sum of coefficient, each coefficient in each formula are equal to 1, SOCaFor SOC, SOC in corresponding monitoring position anolyte liquid storage tank and in cathode electrolyte storage tankbPosition is monitored to be corresponding SOC, SOC in the anode electrolyte export pipeline of pile and in the electrolyte liquid export pipeline of pilecPosition is monitored to be corresponding Set the SOC in the anode electrolyte entrance pipe of pile and in the electrolyte liquid entrance pipe of pile;
Further, also there are following steps before step 2:
According to the ratio result of the power of flow battery system and capacity come configuration coefficients A, B, C;
Further, described according to the power of flow battery system and the ratio result of capacity when monitoring position to being 3 The step of carrying out configuration coefficients A, B, C specifically:
It is to execute step 1. whether the ratio of the power and capacity that judge flow battery system is more than or equal to the first preset value Suddenly 2., no to then follow the steps 3.;
2. configuring 0.1≤A≤0.3,0.5≤B≤0.8,0.1≤C≤0.3, step 3 is executed;
It is to then follow the steps 3. whether the ratio of the power and capacity that judge flow battery system is less than the second preset value 4. 5. no then follow the steps;
4. configuring 0.1≤A≤0.3,0.1≤B≤0.3,0.5≤C≤0.8, step 3 is executed;
5. passing through SOC?=(SOCa+SOCb+SOCc)/3 obtain each SOC average value SOC to monitoring position?, execute step ⑥;
6. as 0 < SOC?≤ 20%, configuration 0.1≤A≤0.33,0.33≤B≤0.6 and 0.1≤C≤0.33 execute Step 3;
As 20% < SOC?≤ 80%, A=B=C is configured, step 3 is executed;
As 80% < SOC?< 100%, configuration 0.1≤A≤0.33,0.1≤B≤0.33 and 0.33≤C≤0.6, holds Row step 3;
Further, described according to the power of flow battery system and the ratio result of capacity when monitoring position to being 2 The step of carrying out configuration coefficients A, B, C specifically:
Whether the ratio of I, the power for judging flow battery system and capacity is more than or equal to the first preset value, is, executes step Rapid II, it is no to then follow the steps III;
II, for formula S OCAlways=A × SOCa+B×SOCb, 0.1≤A≤0.3,0.7≤B≤0.9 are configured, step is executed 3;
For formula S OCAlways=A × SOCa+C×SOCc, 0.4≤A≤0.5,0.5≤C≤0.6 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.7≤B≤0.9,0.1≤C≤0.3 are configured, step 3 is executed;
Whether the ratio of III, the power for judging flow battery system and capacity is to then follow the steps less than the second preset value IV, it is no to then follow the steps V;
IV, for formula S OCAlways=A × SOCa+B×SOCb, 0.4≤A≤0.5,0.5≤B≤0.6 are configured, step is executed 3;
For formula S OCAlways=A × SOCa+C×SOCc, 0.1≤A≤0.3,0.7≤C≤0.9 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.1≤B≤0.3,0.7≤C≤0.9 are configured, step 3 is executed;
V passes through SOCIt is flat=(SOCa+SOCb)/2、SOCIt is flat=(SOCa+SOCc)/2 or SOCIt is flat=(SOCb+SOCc)/2 obtain The SOC average value SOC of any 2 pairs of monitorings positionIt is flat, execute step VI;
VI, as 0 < SOCIt is flatWhen≤20%:
For formula S OCAlways=A × SOCa+B×SOCb, 0.2≤A≤0.5,0.5≤B≤0.8 are configured, step 3 is executed;
For formula S OCAlways=A × SOCa+C×SOCc, 0.4≤A≤0.5,0.5≤C≤0.6 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.5≤B≤0.8,0.2≤C≤0.5 are configured, step 3 is executed;
As 20% < SOCIt is flatWhen≤80%, A=B=C is configured;
As 80% < SOCIt is flatWhen < 100%:
For formula S OCAlways=A × SOCa+B×SOCb, 0.4≤A≤0.5,0.5≤B≤0.6 are configured, step 3 is executed;
For formula S OCAlways=A × SOCa+C×SOCc, 0.2≤A≤0.5,0.5≤C≤0.8 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.2≤B≤0.5,0.5≤C≤0.8 are configured, step 3 is executed.
A kind of flow battery system state-of-charge as shown in Figure 2 monitors system, and the flow battery system includes pile 1, anolyte liquid storage tank 2, cathode electrolyte storage tank 3 and electrolyte circulation line, the monitoring system comprise determining that at least two To the monitoring device of the SOC of different monitoring positions;Any pair of monitoring position are as follows: in anolyte liquid storage tank 2 and electrolyte liquid In storage tank 3, on the anode electrolyte export pipeline of pile 1 and on the electrolyte liquid export pipeline of pile 1 or pile 1 On anode electrolyte entrance pipe and on the electrolyte liquid entrance pipe of pile 1;Further, the monitoring system further includes Monitoring device is connected, for obtaining flow battery system state-of-charge SOC according to each SOC corresponding to monitoring positionAlways's SOC obtains module 10;Further, when monitoring position to being 3, the SOC obtains module 10 and utilizes formula S OCAlways=A × SOCa+B×SOCb+C×SOCcObtain flow battery system state-of-charge SOCAlways, wherein A, B, C are coefficient, A+B+C=1, SOCa For SOC, SOC in corresponding monitoring position anolyte liquid storage tank 2 and in cathode electrolyte storage tank 3bFor corresponding monitoring position electricity SOC, SOC in the anode electrolyte export pipeline of heap 1 and in the electrolyte liquid export pipeline of pile 1cPosition is monitored to be corresponding Set the SOC in the anode electrolyte entrance pipe of pile 1 and in the electrolyte liquid entrance pipe of pile 1;Further, work as prison When location is set to being 2, the SOC obtains module 10 and utilizes formula S OCAlways=A × SOCa+B×SOCb(the corresponding 2 pairs of monitorings of the formula Position is respectively as follows: in anolyte liquid storage tank 2 and in cathode electrolyte storage tank 3 and the anode electrolyte export pipeline of pile 1 Neutralize pile 1 electrolyte liquid export pipeline in), SOCAlways=A × SOCa+C×SOCc(the corresponding 2 pairs of monitoring positions point of the formula Not are as follows: in anolyte liquid storage tank 2 and in cathode electrolyte storage tank 3 and in the anode electrolyte entrance pipe of pile 1 and electric In the electrolyte liquid entrance pipe of heap 1) or SOCAlways=B × SOCb+C×SOCc(the corresponding 2 pairs of monitoring positions difference of the formula Are as follows: in the anode electrolyte export pipeline of pile 1 and the electrolyte liquid export pipeline of pile 1 in and pile 1 anode electricity In solution liquid entrance pipe and in the electrolyte liquid entrance pipe of pile 1) obtain flow battery system state-of-charge SOCAlways, wherein A, B, C are that the sum of coefficient, each coefficient in each formula are equal to 1, SOCaFor in corresponding monitoring position anolyte liquid storage tank 2 and SOC, SOC in cathode electrolyte storage tank 3bFor in the anode electrolyte export pipeline of corresponding monitoring position pile 1 and pile 1 SOC, SOC in electrolyte liquid export pipelinecFor in the anode electrolyte entrance pipe of corresponding monitoring position pile 1 and pile SOC in 1 electrolyte liquid entrance pipe;The present invention can be configured according to the ratio of the power of flow battery system and capacity Coefficient A, B, C, wherein when the first preset value practical application can value 5, when the second preset value practical application, can value 0.2.Wherein, Monitoring interior with cathode electrolyte storage tank 3 in position anolyte liquid storage tank 2 is preferably anolyte liquid storage tank 2 and electrolyte liquid Medium position in storage tank 3.
The present invention can determine at least two pairs of differences by constant-current titration mode, spectrophotometric mode or potentiometric detection mode The SOC of position is monitored, correspondingly, monitoring device is potentiometric titrimeter, spectrophotometer or potential detection device, wherein electricity Position titration mode and spectrophotometric mode are in the prior art by the side of each valence state ion concentration in determining positive and negative anodes electrolyte Formula determines SOC, and the process that the SOC of different monitoring positions pair are determined by potentiometric detection mode is specifically described below:
Electrolyte circulation line of the present invention includes the electrolyte of the anode electrolyte export pipeline 6 of pile, pile The electrolyte liquid entrance pipe 9 of liquid export pipeline 7, the anode electrolyte entrance pipe 8 of pile and pile;The potentiometric detection Device 4 can specifically include the first potential monitoring mould of the first potential monitoring module 41, the second potential monitoring module 42 and connection The potential difference of block 41 and the second potential monitoring module 42 obtains module 43;It is stored up in the anolyte liquid storage tank with electrolyte liquid A pair of of monitoring device is constituted in tank, and the first current potential prison can be placed respectively in anolyte liquid storage tank and in cathode electrolyte storage tank Module 41 and the second potential monitoring module 42 are surveyed, detects anode electrolyte current potential and the cathode in anolyte liquid storage tank Electrolyte liquid current potential in electrolyte storage tank, and then potential difference obtains module 43 and obtains anode electrolyte current potential and electrolyte The difference of liquid current potential;In the anode electrolyte export pipeline of the pile and one is constituted in the electrolyte liquid export pipeline of pile To monitoring device, on the anode electrolyte export pipeline of pile and can be placed respectively on the electrolyte liquid export pipeline of pile First potential monitoring module 41 and the second potential monitoring module 42, detect the anode in the anode electrolyte export pipeline of pile Electrolyte liquid current potential in the electrolyte liquid export pipeline of electrolyte current potential and pile, and then potential difference obtains module 43 obtain the difference of anode electrolyte current potential and electrolyte liquid current potential;It is in the anode electrolyte entrance pipe of the pile and electric A pair of of monitoring device is constituted in the electrolyte liquid entrance pipe of heap, it can be on the anode electrolyte entrance pipe of pile and pile Electrolyte liquid entrance pipe on place the first potential monitoring module 41 and the second potential monitoring module 42 respectively, detect electricity Cathode in the electrolyte liquid entrance pipe of anode electrolyte current potential and pile in the anode electrolyte entrance pipe of heap Electrolyte current potential, and then potential difference obtains the difference that module 43 obtains anode electrolyte current potential and electrolyte liquid current potential;It is described Potential detection device can be potential monitoring meter or SOC battery etc.;When potential detection device obtain it is each to monitoring position it is positive and negative After pole electrolyte potential difference (determining SOC state locating for electrolyte by detection positive and negative anodes electrolyte potential difference), Ke Yili Flow battery system state-of-charge SOC is obtained with weighted mean methodAlways, also can use other empirical equations and obtain SOCAlways;It is described First potential monitoring module 41 and the second potential monitoring module 42 monitor current potential by the electrode being placed in electrolyte, specifically may be used To be respectively provided with detecting electrode, detecting electrode can also be respectively included and reference electrode (is detected using reference electrode method positive and negative Potential difference determines SOC state locating for electrolyte between the electrolyte of pole).
Flow battery system state-of-charge monitoring method and its system provided by the invention pass through comprehensive flow battery system The state-of-charge of multiple monitoring positions, and then obtain flow battery system state-of-charge, so that the monitoring knot of state-of-charge (SOC) For fruit closer to actual value, monitoring is accurate comprehensive;Meanwhile the lotus convenient for knowing flow battery system difference monitoring position in real time Electricity condition realizes the redundancy of SOC measurement;Also, when the monitoring device set by some monitoring positions breaks down, still It can guarantee the monitoring result for obtaining state-of-charge precisely in real time, to be conducive to improve the service efficiency of flow battery, extend electricity The service life in pond, accurately manages flow battery system, and table 1 gives flow battery system using different state-of-charge monitoring sides The monitoring application condition data of method, wherein monitoring error information respectively corresponds: the first situation: the SOC of pile entrance being made For flow battery system SOCAlways, second situation: using the SOC in pile exit as flow battery system SOCAlways, the third feelings Condition: using the SOC in anolyte liquid storage tank and in cathode electrolyte storage tank as flow battery system SOCAlwaysAnd the 4th kind of feelings Condition: in the comprehensive anolyte liquid storage tank of the present invention and in cathode electrolyte storage tank, the anode electrolyte export pipeline of pile neutralizes Enter in the electrolyte liquid export pipeline of pile and with the electrolyte liquid of pile in the anode electrolyte entrance pipe of pile The SOC of three pairs of monitoring positions is as flow battery system SOC in mouth pipelineAlways, from table 1 it follows that charged shape of the invention State (SOC) monitoring result error very little, as a result accurately.
The monitoring application condition data of 1. difference SOC monitoring method of table
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto, Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.

Claims (7)

1. a kind of flow battery system state-of-charge monitoring method, the flow battery system includes pile, anode electrolyte storage Tank, cathode electrolyte storage tank and electrolyte circulation line;It is characterized in that, the monitoring method includes the following steps:
Step 1: determining the SOC of at least two pairs different monitoring positions;Any pair of monitoring position are as follows: in anolyte liquid storage tank and negative In the electrolyte storage tank of pole, in the anode electrolyte export pipeline of pile and in the electrolyte liquid export pipeline of pile or electricity In the anode electrolyte entrance pipe of heap and in the electrolyte liquid entrance pipe of pile;
Step 2: according to each SOC corresponding to monitoring position, obtaining flow battery system state-of-charge SOCAlways
When monitoring position to being 3, the step 2 specifically:
Utilize formula S OCAlways=A × SOCa+B×SOCb+C×SOCcObtain flow battery system state-of-charge SOCAlways, wherein A, B, C is coefficient, A+B+C=1, SOCaFor in corresponding monitoring position anolyte liquid storage tank and in cathode electrolyte storage tank SOC, SOCbFor in the anode electrolyte export pipeline of corresponding monitoring position pile and in the electrolyte liquid export pipeline of pile SOC、SOCcFor in the anode electrolyte entrance pipe of corresponding monitoring position pile and in the electrolyte liquid entrance pipe of pile SOC.
2. a kind of flow battery system state-of-charge monitoring method according to claim 1, it is characterised in that when monitoring position When setting to being 2, the step 2 specifically:
Utilize formula S OCAlways=A × SOCa+B×SOCb、SOCAlways=A × SOCa+C×SOCcOr SOCAlways=B × SOCb+C× SOCcObtain flow battery system state-of-charge SOCAlways, wherein A, B, C are that the sum of coefficient, each coefficient in each formula are equal to 1, SOCaFor SOC, SOC in corresponding monitoring position anolyte liquid storage tank and in cathode electrolyte storage tankbFor corresponding monitoring position electricity SOC, SOC in the anode electrolyte export pipeline of heap and in the electrolyte liquid export pipeline of pilecPosition is monitored to be corresponding SOC in the anode electrolyte entrance pipe of pile and in the electrolyte liquid entrance pipe of pile.
3. a kind of flow battery system state-of-charge monitoring method according to claim 1 or 2, it is characterised in that in step Also there are following steps before 2:
According to the ratio result of the power of flow battery system and capacity come configuration coefficients A, B, C.
4. a kind of flow battery system state-of-charge monitoring method according to claim 3, it is characterised in that when monitoring position When setting to being 3, it is described according to the power of flow battery system and the ratio result of capacity come configuration coefficients A, B, C the step of it is specific Are as follows:
It is to then follow the steps 1. whether the ratio of the power and capacity that judge flow battery system is more than or equal to the first preset value 2. 3. no then follow the steps;
2. configuring 0.1≤A≤0.3,0.5≤B≤0.8,0.1≤C≤0.3, step 3 is executed;
It is to then follow the steps 4. 3. whether the ratio of the power and capacity that judge flow battery system is less than the second preset value, it is no It thens follow the steps 5.;
4. configuring 0.1≤A≤0.3,0.1≤B≤0.3,0.5≤C≤0.8, step 3 is executed;
5. passing through SOC?=(SOCa+SOCb+SOCc)/3 obtain each SOC average value SOC to monitoring position?, execute step 6.;
6. as 0 < SOC?≤ 20%, configuration 0.1≤A≤0.33,0.33≤B≤0.6 and 0.1≤C≤0.33 execute step 3;
As 20% < SOC?≤ 80%, A=B=C is configured, step 3 is executed;
As 80% < SOC?< 100%, configuration 0.1≤A≤0.33,0.1≤B≤0.33 and 0.33≤C≤0.6, executes step Rapid 3.
5. a kind of flow battery system state-of-charge monitoring method according to claim 3, it is characterised in that when monitoring position When setting to being 2, it is described according to the power of flow battery system and the ratio result of capacity come configuration coefficients A, B, C the step of it is specific Are as follows:
Whether the ratio of I, the power for judging flow battery system and capacity is more than or equal to the first preset value, is to then follow the steps II, it is no to then follow the steps III;
II, for formula S OCAlways=A × SOCa+B×SOCb, 0.1≤A≤0.3,0.7≤B≤0.9 are configured, step 3 is executed;
For formula S OCAlways=A × SOCa+C×SOCc, 0.4≤A≤0.5,0.5≤C≤0.6 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.7≤B≤0.9,0.1≤C≤0.3 are configured, step 3 is executed;
Whether the ratio of III, the power for judging flow battery system and capacity is to then follow the steps IV less than the second preset value, no Then follow the steps V;
IV, for formula S OCAlways=A × SOCa+B×SOCb, 0.4≤A≤0.5,0.5≤B≤0.6 are configured, step 3 is executed;
For formula S OCAlways=A × SOCa+C×SOCc, 0.1≤A≤0.3,0.7≤C≤0.9 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.1≤B≤0.3,0.7≤C≤0.9 are configured, step 3 is executed;
V passes through SOCIt is flat=(SOCa+SOCb)/2、SOCIt is flat=(SOCa+SOCc)/2 or SOCIt is flat=(SOCb+SOCc)/2 obtain arbitrarily The SOC average value SOC of 2 pairs of monitoring positionsIt is flat, execute step VI;
VI, as 0 < SOCIt is flatWhen≤20%:
For formula S OCAlways=A × SOCa+B×SOCb, 0.2≤A≤0.5,0.5≤B≤0.8 are configured, step 3 is executed;
For formula S OCAlways=A × SOCa+C×SOCc, 0.4≤A≤0.5,0.5≤C≤0.6 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.5≤B≤0.8,0.2≤C≤0.5 are configured, step 3 is executed;
As 20% < SOCIt is flatWhen≤80%, A=B=C is configured;
As 80% < SOCIt is flatWhen < 100%:
For formula S OCAlways=A × SOCa+B×SOCb, 0.4≤A≤0.5,0.5≤B≤0.6 are configured, step 3 is executed;
For formula S OCAlways=A × SOCa+C×SOCc, 0.2≤A≤0.5,0.5≤C≤0.8 are configured, step 3 is executed;
For formula S OCAlways=B × SOCb+C×SOCc, 0.2≤B≤0.5,0.5≤C≤0.8 are configured, step 3 is executed.
6. a kind of flow battery system state-of-charge monitors system, the flow battery system includes pile, anode electrolyte storage Tank, cathode electrolyte storage tank and electrolyte circulation line, it is characterised in that the monitoring system includes:
Determine the monitoring device of the SOC of at least two pairs different monitoring positions;Any pair of monitoring position are as follows: in anolyte liquid storage tank With in cathode electrolyte storage tank, on the anode electrolyte export pipeline of pile and on the electrolyte liquid export pipeline of pile or On the anode electrolyte entrance pipe of person's pile and on the electrolyte liquid entrance pipe of pile;
The monitoring system further includes connection monitoring device, for obtaining liquid stream according to each SOC corresponding to monitoring position Battery system state-of-charge SOCAlwaysSOC obtain module;
When monitoring position to being 3, the SOC obtains module and utilizes formula S OCAlways=A × SOCa+B×SOCb+C×SOCcIt obtains Flow battery system state-of-charge SOCAlways, wherein A, B, C are coefficient, A+B+C=1, SOCaPosition anolyte is monitored to be corresponding SOC, SOC in liquid storage tank and in cathode electrolyte storage tankbIn anode electrolyte export pipeline for corresponding monitoring position pile With SOC, SOC in the electrolyte liquid export pipeline of pilecFor the anode electrolyte entrance pipe of corresponding monitoring position pile Neutralize the SOC in the electrolyte liquid entrance pipe of pile.
7. a kind of flow battery system state-of-charge according to claim 6 monitors system, it is characterised in that when monitoring position When setting to being 2, the SOC obtains module and utilizes formula S OCAlways=A × SOCa+B×SOCb、SOCAlways=A × SOCa+C×SOCc、 Or SOCAlways=B × SOCb+C×SOCcObtain flow battery system state-of-charge SOCAlways, wherein A, B, C are coefficient, each formula In the sum of each coefficient be equal to 1, SOCaFor in corresponding monitoring position anolyte liquid storage tank and in cathode electrolyte storage tank SOC、SOCbFor in the anode electrolyte export pipeline of corresponding monitoring position pile and in the electrolyte liquid export pipeline of pile SOC, SOCcFor the electrolyte liquid entrance pipe in the anode electrolyte entrance pipe of corresponding monitoring position pile with pile In SOC.
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CN201410613631.0A CN105572594B (en) 2014-11-03 2014-11-03 Flow battery system state-of-charge monitoring method and its system
EP19208348.3A EP3627168B1 (en) 2014-11-03 2015-11-03 Flow battery based on redundancy design of soc detection devices
AU2015342321A AU2015342321B2 (en) 2014-11-03 2015-11-03 Method and system for monitoring state of charge (SOC) of flow battery system, flow battery based on redundancy design of SOC detection device, method and device for determining actual capacity of flow battery, and method and system for estimating input-output characteristic of flow battery alternating current side
PCT/CN2015/093707 WO2016070794A1 (en) 2014-11-03 2015-11-03 Method and system for monitoring state of charge (soc) of flow battery system, flow battery based on redundancy design of soc detection device, method and device for determining actual capacity of flow battery, and method and system for estimating input-output characteristic of flow battery alternating current side
EP17173863.6A EP3246720B1 (en) 2014-11-03 2015-11-03 Method and system for determining the state of charge of flow battery system
JP2017542255A JP6491347B2 (en) 2014-11-03 2015-11-03 Flow battery system charge state monitoring and measurement method, flow battery based on redundant design of SOC detection device, flow battery actual capacity determination method and device, flow battery AC side input / output characteristics estimation method and method system
EP15856903.8A EP3214455B1 (en) 2014-11-03 2015-11-03 Method and system for monitoring the state of charge (soc) of a flow battery system
US15/585,970 US10424797B2 (en) 2014-11-03 2017-05-03 Method and system for monitoring state of charge (SOC) of flow battery system, flow battery based on redundancy design of SOC detection device, method and device for determining actual capacity of flow battery, and method and system for estimating input-output characteristic of alternating-current side of flow battery
US16/412,747 US10629932B2 (en) 2014-11-03 2019-05-15 Method and system for monitoring state of charge (SOC) of flow battery system

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