CN104300165A - A kind of SOC detecting device and its method and liquid flow battery system - Google Patents

Abstract

The invention discloses an SOC detection device, a method thereof and a flow battery system, wherein the SOC detection device comprises an electrolyte container; the electrolyte container includes: a positive electrolyte chamber; a negative electrolyte chamber; an ion-conducting membrane; a first electrode part arranged in the positive electrolyte chamber and used for detecting the potential of the positive electrolyte; the second electrode part is arranged in the negative electrolyte cavity and used for detecting the potential of the negative electrolyte; the SOC detection apparatus further includes: the potential difference acquisition module is connected with the first electrode part and the second electrode part and used for acquiring the absolute value of the difference value between the positive electrolyte potential and the negative electrolyte potential according to the positive electrolyte potential and the negative electrolyte potential; the SOC detection device can realize the SOC online detection of the flow battery system, can be arranged at different positions of the flow battery system, realizes SOC detection at multiple points, and is further favorable for managing and monitoring the electrolyte state in the flow battery system.

Description

A kind of SOC detecting device and its method and liquid flow battery system

technical field

The invention relates to the technical field of liquid flow batteries, in particular to an SOC detection device, a method thereof, and a liquid flow battery system. the

Background technique

The flow battery system is one of the preferred technologies for large-scale energy storage. It generally includes a stack, a positive electrolyte storage tank, a negative electrolyte storage tank, a circulating pump, and an electrolyte circulation pipeline. The positive electrolyte storage tank passes through the electrolyte The circulation pipeline and circulation pump are connected to the positive electrolyte inlet of the stack, the negative electrolyte storage tank is connected to the negative electrolyte inlet of the stack through the electrolyte circulation pipeline and the circulation pump, and the positive electrolyte outlet of the stack is connected to the electrolyte circulation pipe The positive electrode electrolyte storage tank is connected to the positive electrode electrolyte solution, and the negative electrode electrolyte solution outlet of the cell stack is connected to the negative electrode electrolyte solution storage tank through the electrolyte circulation pipeline. The battery state of charge (SOC) is an important parameter that needs to be monitored during the use of the flow battery, so as to fully understand the current charge and discharge level of the flow battery, and is the basis for the precise control and management of the flow battery system. Direct basis, in fact, during the working process of the flow battery system, the electrolyte in the positive and negative electrolyte storage tanks is driven by the circulation pump to flow through the electrolyte circulation pipeline and the stack, and electrochemical reactions occur in the stack , so that the active material concentration of the electrolyte entering the stack changes, and then the electrolyte returns to the positive and negative electrolyte storage tanks and mixes with the electrolyte in the storage tanks, so the batteries in different positions of the flow battery system are charged The status (SOC) is different; in the prior art, an additional independent SOC detection device is generally installed near the electrolyte inlet and outlet of the stack. There is a large pressure difference between the electrolyte inlet and outlet of the stack, which often brings certain errors to the SOC detection results. In addition, because the installation position of the SOC detection device is relatively fixed, it is impossible to realize the SOC online detection at different positions of the flow battery system. . the

Contents of the invention

In view of the above problems, the present invention develops an SOC detection device, its method and a liquid flow battery system. the

Technical means of the present invention is as follows:

A kind of SOC detecting device, described SOC detecting device comprises electrolyte container; This electrolyte container comprises:

positive electrolyte chamber;

Negative electrolyte chamber;

an ion-conducting membrane disposed between the positive electrolyte chamber and the negative electrolyte chamber;

A first electrode part disposed in the positive electrolyte chamber for detecting the potential of the positive electrolyte;

And a second electrode part arranged in the negative electrode electrolyte chamber for detecting the potential of the negative electrode electrolyte;

The SOC detection device also includes:

Connecting the first electrode part and the second electrode part, a potential difference acquisition module for obtaining the absolute value of the difference between the positive electrode electrolyte potential and the negative electrode electrolyte potential according to the positive electrode electrolyte potential and the negative electrode electrolyte potential ;

Further, the SOC detection device also includes:

Connect the potential difference acquisition module and use the calculation formula To calculate the SOC acquisition module of SOC, wherein x is the absolute value of the difference between the positive electrolyte potential and the negative electrolyte potential;

Further, the first electrode part and the second electrode part each have detection electrodes;

Further, the first electrode part and the second electrode part also respectively have a reference electrode;

Further, the electrolyte container is detachably installed in the electrolyte circulation pipeline of the flow battery system;

Further, both ends of the electrolyte container can be detachably connected to a positive electrode electrolyte storage tank and a negative electrode electrolyte storage tank. the

A kind of SOC detection method of SOC detection device as described above, described SOC detection method comprises the steps:

Step 1: Install the electrolyte container in the electrolyte circulation pipeline of the flow battery system, or connect both ends of the electrolyte container to the positive electrolyte storage tank and the negative electrolyte storage tank of the flow battery system;

Step 2: Detect the potential of the positive electrolyte and the potential of the negative electrolyte through the first electrode part and the second electrode part;

Step 3: The potential difference acquisition module calculates the absolute value of the difference between the positive electrolyte potential and the negative electrolyte potential;

Further, there are following steps after step 3:

Step 4: SOC acquisition module uses the calculation formula To calculate the SOC, where x is the absolute value of the difference between the positive electrolyte potential and the negative electrolyte potential.

A liquid flow battery system, comprising: a positive electrode electrolyte storage tank, a negative electrode electrolyte storage tank, an electric stack, and an electrolyte circulation pipeline, and also includes the SOC detection device described in any one of the above. the

Due to the adoption of the above technical solution, the present invention provides a SOC detection device and its method and a flow battery system, the SOC detection device can realize the SOC online detection of the flow battery system, and can be installed in the flow battery system Different positions, simple structure, convenient and flexible use, and then realize SOC detection at multiple different positions, which is beneficial to manage and monitor the electrolyte state in the flow battery system, improve the use efficiency of the flow battery, and prolong the service life of the battery. the

Description of drawings

Fig. 1, Fig. 2 and Fig. 3 are the structural representations of SOC detection device of the present invention;

Figure 4, Figure 5 and Figure 6 are schematic diagrams of the electrolyte container of the present invention installed in different positions of the flow battery system;

7 is a schematic diagram of the corresponding curve between the absolute value of the difference between the potential of the positive electrolyte and the potential of the negative electrolyte and the SOC. the

In the figure: 1. SOC detection device, 2. Positive electrolyte storage tank, 3. Negative electrolyte storage tank, 4. Stack, 5. Circulation pump, 10. Positive electrolyte chamber, 11. Negative electrolyte chamber , 12. Ion-conducting membrane, 13. Detection electrode, 14. Reference electrode, 15. SOC acquisition module, 16. First pipeline, 17. Second pipeline, 18. Third pipeline, 19. Fourth tube 20. A potential difference acquisition module. the

Detailed ways

A kind of SOC detection device as shown in Fig. 1, Fig. 2 and Fig. 3, described SOC detection device 1 comprises electrolyte container; This electrolyte container comprises: positive pole electrolyte chamber 10; Negative pole electrolyte chamber 11; An ion-conducting membrane 12 between the positive electrolyte chamber 10 and the negative electrolyte chamber 11; a first electrode portion disposed in the positive electrolyte chamber 10 for detecting the potential of the positive electrolyte; and Set in the negative electrode electrolyte chamber 11, the second electrode part used to detect the potential of the negative electrode electrolyte solution; the SOC detection device 1 also includes: connecting the first electrode part and the second electrode part, for according to The positive electrode electrolyte potential and the negative electrode electrolyte potential obtain the potential difference acquisition module 20 of the absolute value of the difference between the positive electrode electrolyte potential and the negative electrode electrolyte potential; further, the SOC detection device 1 also includes: a connection potential The difference acquisition module 20 utilizes the calculation formula To calculate the SOC acquisition module 15 of SOC, wherein x is the absolute value of the difference between the positive electrolyte potential and the negative electrolyte potential; further, the first electrode part and the second electrode part have detection electrodes respectively 13; further, the first electrode part and the second electrode part also have a reference electrode 14 respectively.

As shown in Figure 4, Figure 5 and Figure 6, further, the electrolyte container is detachably installed in the electrolyte circulation pipeline of the flow battery system; further, both ends of the electrolyte container are detachable Connect positive electrode electrolyte storage tank 2 and negative electrode electrolyte storage tank 3. the

A kind of SOC detection method as described above SOC detection device, comprises the steps:

Step 1: Install the electrolyte container in the electrolyte circulation pipeline of the flow battery system, or connect both ends of the electrolyte container to the positive electrolyte storage tank 2 and the negative electrolyte storage tank 3 of the flow battery system ;

Step 2: Detect the potential of the positive electrolyte and the potential of the negative electrolyte through the first electrode part and the second electrode part;

Step 3: The potential difference acquisition module 20 calculates the absolute value of the difference between the positive electrolyte potential and the negative electrolyte potential;

After step 3, there are also the following steps:

Step 4: SOC acquisition module 15 utilizes the calculation formula To calculate the SOC, where x is the absolute value of the difference between the positive electrolyte potential and the negative electrolyte potential.

As shown in Fig. 4, Fig. 5 and Fig. 6, a liquid flow battery system includes: a positive electrode electrolyte storage tank 2, a negative electrode electrolyte storage tank 3, an electric stack 4 and an electrolyte circulation pipeline, and also includes any of the above-mentioned The SOC detection device 1 described in the item. the

The first electrode part of the present invention is arranged in the positive electrode electrolyte chamber 10 for detecting the potential of the positive electrode electrolyte; the second electrode part is arranged in the negative electrode electrolyte chamber 11 for detecting the potential of the negative electrode electrolyte Electrolyte potential; when the first electrode portion and the second electrode portion have detection electrodes 13 respectively, the potential measured by the detection electrode 13 in the positive electrolyte chamber 10 is used as the positive electrolyte potential, and the negative electrode electrolysis The potential measured by the detection electrode 13 in the liquid chamber 11 is used as the negative electrode electrolyte potential, and the potential difference acquisition module 20 connected to the first electrode part and the second electrode part makes a difference between the positive electrode electrolyte potential and the negative electrode electrolyte potential to obtain The absolute value x of the difference between the positive electrode electrolyte potential and the negative electrode electrolyte potential is obtained, and the SOC acquisition module 15 can use the calculation formula according to x To calculate the SOC, you can also use x to obtain the SOC through other calculation methods; when the first electrode part and the second electrode part have a reference electrode 14 in addition to the detection electrode 13, the reference electrode 14 outputs The known potential value is used as an electrode for reference and comparison when measuring the potential of the positive and negative electrolytes. At this time, the potential difference acquisition module 20 passes through, and the potential measured by the detection electrode 13 in the positive electrolyte chamber 10 minus the positive electrolyte The reference electrode 14 output potential in the chamber 10 obtains the positive electrode electrolyte potential, and the potential measured by the detection electrode 13 in the negative electrode electrolyte chamber 11 subtracts the reference electrode 14 output potential in the negative electrode electrolyte chamber 11 to obtain The negative electrode electrolyte potential is obtained, and further, by making a difference between the positive electrode electrolyte potential and the negative electrode electrolyte potential, the absolute value x of the difference between the positive electrode electrolyte potential and the negative electrode electrolyte potential is obtained, and the SOC acquisition module 15 can be obtained by SOC calculation formula To calculate the SOC, you can also use x to obtain the SOC through other calculation methods.

Figure 7 shows a schematic diagram of the corresponding curve between the absolute value x of the difference between the potential of the positive electrolyte and the potential of the negative electrolyte and the SOC. Described curve can obtain above-mentioned SOC calculating formula of the present invention by curve fitting mode The SOC detection method of the present invention can be carried out during the charging and discharging process of the flow battery, that is, the SOC online detection is realized, and the monitoring result is more direct and accurate.

The volume and shape of the electrolyte container included in the SOC detection device 1 of the present invention are not fixed, and can be adjusted according to actual application requirements. Fig. 1, Fig. 2 and Fig. 3 respectively show the SOC detection of electrolyte containers with different structures Schematic diagram of the device structure, wherein the electrolyte container in Figure 1 has a square structure, the electrolyte container in Figure 2 has a spherical structure, and the electrolyte container in Figure 3 has a triangular structure, the shape and structure of the electrolyte container in practical applications It is not limited thereto, and those skilled in the art can also obtain other drawings based on these drawings without creative effort. the

The electrolyte container of the present invention can be installed in multiple different positions of the flow battery system, thereby realizing SOC detection at multiple points, specifically, the electrolyte container can be detachably installed in the electrolyte circulation of the flow battery system In the pipeline, or both ends of the electrolyte container can be detachably connected to the positive electrolyte storage tank 2 and the negative electrolyte storage tank 3; between the positive electrolyte storage tank 2, the negative electrolyte storage tank 3 and the stack 4 normal electrolyte circulation has no effect. the

For example, both ends of the electrolyte container are connected to the positive electrolyte storage tank 2 and the negative electrolyte storage tank 3, so as to realize the SOC detection of the electrolyte circulating between the positive electrolyte storage tank 2 and the negative electrolyte storage tank 3, as shown in FIG. 4 A schematic structural view showing that both ends of the electrolyte container are connected to a positive electrode electrolyte storage tank and a negative electrode electrolyte storage tank, as shown in Figure 4, further, the positive electrode electrolyte chamber 10 has a positive electrode electrolyte inlet and positive electrode electrolyte outlet; the negative electrode electrolyte chamber 11 has a negative electrode electrolyte inlet and a negative electrode electrolyte outlet; the SOC detection device 1 can include a positive electrode electrolyte storage tank 2 and a negative electrode electrolyte storage tank Piping system, which includes: a first pipeline 16 connecting the positive electrode electrolyte storage tank 2 and the positive electrode electrolyte inlet, a second pipeline connecting the negative electrode electrolyte storage tank 3 and the negative electrode electrolyte inlet 17. The third pipeline 18 connecting the positive electrode electrolyte outlet and the positive electrode electrolyte storage tank 2, and the fourth pipeline 19 connecting the negative electrode electrolyte outlet and the negative electrode electrolyte storage tank 3; , the positive electrode electrolyte flows out from the positive electrode electrolyte storage tank 2, and flows into the positive electrode electrolyte storage tank 2 after passing through the positive electrode electrolyte solution chamber 10 of the SOC detection device 1; the negative electrode electrolyte flows out from the negative electrode electrolyte storage tank 3, and passes through After the negative electrode electrolyte chamber 11 of the SOC detection device 1 , it flows into the negative electrode electrolyte storage tank 3 . the

For example, the electrolyte container can be detachably installed in the electrolyte circulation pipeline of the flow battery system. Further, the SOC detection device 1 can be installed in the pipeline where the electrolyte flows into the stack 4, thereby realizing the flow control. Electrolyte SOC detection of the stack 4, FIG. 5 shows a schematic structural view of the SOC detection device installed in the pipeline where the electrolyte flows into the stack, as shown in FIG. 5, further, the SOC detection device 1 can Including a pipeline system detachably connected with the positive electrode electrolyte storage tank 2, the negative electrode electrolyte storage tank 3 and the stack 4; further, the positive electrode electrolyte chamber 10 has a positive electrode electrolyte inlet and a positive electrode electrolyte outlet; the The negative electrode electrolyte chamber 11 has a negative electrode electrolyte inlet and a negative electrode electrolyte outlet; Storage tank 3 and the second pipeline 17 of the negative electrode electrolyte inlet, the third pipeline 18 connecting the positive electrode electrolyte outlet and the electric stack 4, and the fourth pipeline 18 connecting the negative electrode electrolyte outlet and the electric stack 4 Line 19. In this connection mode, the positive electrode electrolyte flows out from the positive electrode electrolyte storage tank 2 through the circulation pump 5, and flows into the cell stack 4 after passing through the positive electrode electrolyte chamber 10 of the SOC detection device 1; the negative electrode electrolyte flows from the negative electrode electrolyte storage tank The tank 3 flows out through the circulating pump, and flows into the stack 4 after passing through the negative electrolyte chamber 11 of the SOC detection device 1; further, the SOC detection device 1 can be installed in the pipeline where the electrolyte flows out of the stack 4, Further realize the SOC detection of the electrolyte flowing out of the stack 4, and Fig. 6 shows a schematic structural view of the SOC detection device installed in the pipeline of the electrolyte flowing out of the stack, as shown in Fig. 6, further, the SOC The detection device 1 may include a pipeline system detachably connected to the positive electrolyte storage tank 2, the negative electrolyte storage tank 3 and the stack 4; further, the positive electrolyte chamber 10 has a positive electrolyte inlet and a positive electrolytic solution. Liquid outlet; the negative electrode electrolyte chamber 11 has a negative electrode electrolyte inlet and a negative electrode electrolyte outlet; the pipeline system includes: a first pipeline 16 connecting the stack 4 and the positive electrode electrolyte inlet, connecting the stack 4 and the second pipeline 17 of the negative electrode electrolyte inlet, the third pipeline 18 connecting the positive electrode electrolyte outlet and the positive electrode electrolyte storage tank 2, and connecting the negative electrode electrolyte outlet and the negative electrode electrolyte storage tank 3's fourth pipeline 19. In this connection mode, the positive electrode electrolyte flows out from the cell stack 4, and flows into the positive electrode electrolyte storage tank 2 after passing through the positive electrode electrolyte chamber 10 of the SOC detection device 1; the negative electrode electrolyte flows out from the cell stack 4, and passes through the SOC After detecting the negative electrode electrolyte chamber 11 of the device 1 , it flows into the negative electrode electrolyte storage tank 3 . the

In actual application, the installation position of the electrolyte container in the flow battery system can be adjusted according to the specific requirements of SOC detection, and can be installed in the main pipeline or in the branch pipeline; due to the SOC detection The device 1 is detachably connected to the positive electrode electrolyte storage tank 2, the negative electrode electrolyte storage tank 3 and the stack 4, so when the SOC detection device 1 is not needed, the SOC detection device 1 can be directly removed from the detection position, specifically through The detachably connected pipeline system realizes the connection between the positive electrolyte storage tank 2, the negative electrolyte storage tank 3 and the stack 4; the pipeline system is provided with a valve, when the pipeline system is disconnected from the positive electrolyte storage tank When connecting between tank, negative electrode electrolyte storage tank and stack, just close the valve. the

The present invention provides a SOC detection device and its method and a liquid flow battery system. The SOC detection device can realize the SOC online detection of the liquid flow battery system, and can be installed in different positions of the liquid flow battery system. It has a simple structure and is easy to use. It is convenient and flexible, and then realizes SOC detection at multiple different positions, which is beneficial to manage and monitor the state of the electrolyte in the flow battery system, improve the use efficiency of the flow battery, and prolong the service life of the battery. the

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention. the

Claims (9)

1. a SOC detection device, is characterized in that, described SOC detection device (1) comprises electrolyte container; This electrolyte container comprises: positive electrolyte chamber (10); Negative electrode electrolyte chamber (11); an ion-conducting membrane (12) placed between the positive electrolyte chamber (10) and the negative electrolyte chamber (11); A first electrode part disposed in the positive electrolyte chamber (10) for detecting the potential of the positive electrolyte; And a second electrode part arranged in the negative electrode electrolyte chamber (11) for detecting the potential of the negative electrode electrolyte; The SOC detection device (1) also includes: Connecting the first electrode part and the second electrode part, a potential difference acquisition module for obtaining the absolute value of the difference between the positive electrode electrolyte potential and the negative electrode electrolyte potential according to the positive electrode electrolyte potential and the negative electrode electrolyte potential (20). 2. A kind of SOC detection device according to claim 1, is characterized in that described SOC detection device (1) also comprises: Connect the potential difference acquisition module (20), and use the calculation formula To calculate the SOC acquisition module (15) of SOC, wherein x is the absolute value of the difference between the positive electrode electrolyte potential and the negative electrode electrolyte potential. 3. The SOC detection device according to claim 1, characterized in that, the first electrode part and the second electrode part each have a detection electrode (13). 4. The SOC detection device according to claim 3, characterized in that, the first electrode part and the second electrode part also have reference electrodes (14) respectively. 5 . The SOC detection device according to claim 1 , wherein the electrolyte container is detachably installed in the electrolyte circulation pipeline of the flow battery system. 6 . The SOC detection device according to claim 1 , characterized in that, both ends of the electrolyte container can be detachably connected to a positive electrolyte storage tank ( 2 ) and a negative electrode electrolyte storage tank ( 3 ). 7. a kind of SOC detection method of SOC detection device as claimed in claim 1, is characterized in that, described SOC detection method comprises the steps: Step 1: Install the electrolyte container in the electrolyte circulation pipeline of the flow battery system, or connect both ends of the electrolyte container to the positive electrolyte storage tank (2) and negative electrolyte storage tank (2) of the flow battery system. tank(3); Step 2: detecting the potential of the positive electrolyte and the potential of the negative electrolyte through the first electrode part and the second electrode part; Step 3: The potential difference acquisition module (20) calculates the absolute value of the difference between the positive electrode electrolyte potential and the negative electrode electrolyte potential. 8. SOC detection method according to claim 7, is characterized in that after step 3 also has following steps: Step 4: SOC acquisition module (15) utilizes the calculation formula To calculate the SOC, where x is the absolute value of the difference between the positive electrolyte potential and the negative electrolyte potential. 9. A liquid flow battery system, comprising: a positive electrode electrolyte storage tank (2), a negative electrode electrolyte storage tank (3), an electric stack (4) and an electrolyte circulation pipeline, characterized in that it also includes claims 1 to 6. The SOC detection device (1) described in any one of these items.