A heat exchange pipeline system for a vanadium redox flow battery

Abstract

The utility model belongs to the technical field of liquid flow battery energy storage system, concretely relates to a kind of all-vanadium redox flow battery heat exchange pipeline system, including positive electrode pipeline module and negative electrode pipeline module, the positive electrode pipeline module includes positive electrode electrolyte storage tank, first circulating pump, first branch, second branch, first solenoid valve and evaporator being arranged on the first branch, second solenoid valve and first loop being arranged on the second branch, the opening of the first solenoid valve and second solenoid valve is complementary relationship, the negative electrode pipeline module includes negative electrode electrolyte storage tank, second circulating pump, third solenoid valve and second loop.The all-vanadium redox flow battery heat exchange pipeline system of the utility model effectively reduces flow resistance while ensuring electrolyte cooling effect, ensures that the pressure and flow of positive and negative electrode electrolyte pipeline are same, improves system performance and life.

Description

Technical Field

[0001] This utility model relates to the technical field of flow battery energy storage systems, specifically to a heat exchange pipeline system for an all-vanadium redox flow battery. Background Technology

[0002] In a vanadium redox flow battery, the electrolyte flows from a storage tank into the stack via a piping system, reacts, and then returns to the storage tank, completing the charge-discharge cycle. During battery discharge, the electrolyte generates heat due to the chemical reaction, causing its temperature to rise. Without temperature control, this high temperature not only degrades the performance of the plastic corrosion-resistant chemical pipes but also leads to irreversible crystallization of the electrolyte, significantly impacting the performance of the flow battery.

[0003] In existing technologies, titanium tube heat exchangers are susceptible to corrosion from the negative electrode electrolyte. Therefore, the evaporator is typically installed only in the positive electrode piping system to cool the electrolyte. However, the high local flow resistance of the positive electrode electrolyte after passing through the evaporator increases the pump load. Furthermore, since the evaporator is only located at the positive electrode, a pressure difference exists between the positive and negative electrode piping at the same pump frequency. Adjusting the pump frequency to maintain consistent pressure at both electrodes results in flow rate deviations. Both of these conditions negatively impact the stability of the flow battery.

[0004] Therefore, it is necessary to provide a new all-vanadium redox flow battery heat exchange piping system. Utility Model Content

[0005] In view of this, the present invention provides a heat exchange pipeline system for a vanadium redox flow battery, which effectively reduces flow resistance and improves circulation efficiency while ensuring the cooling effect of the electrolyte. It also ensures that the pressure and flow rate of the positive and negative electrode electrolyte pipelines are the same, enhances the stability of battery operation, and improves system performance and lifespan.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a heat exchange pipeline system for a vanadium redox flow battery is provided, including: a positive electrode pipeline module and a negative electrode pipeline module. The positive electrode pipeline module is used for the circulation and temperature control of the positive electrode electrolyte, and the negative electrode pipeline module is used for the circulation of the negative electrode electrolyte. The positive electrode pipeline module includes a positive electrode electrolyte storage tank, a first circulation pump, a first branch, a second branch, a first solenoid valve and an evaporator disposed on the first branch, a second solenoid valve disposed on the second branch, and a first circuit. The opening degrees of the first solenoid valve and the second solenoid valve are complementary. The negative electrode pipeline module includes a negative electrode electrolyte storage tank, a second circulation pump, a third solenoid valve, and a second circuit.

[0007] Furthermore, one end of the first branch is connected to the first circulating pump, and the other end is connected to the first circuit. The first solenoid valve and the evaporator are connected in series on the first branch. The first solenoid valve acts as a switch on the first branch. When the electrolyte temperature is too high, the first solenoid valve opens, allowing the electrolyte to flow through the evaporator to cool down.

[0008] Furthermore, one end of the second branch is connected to the first circulating pump, and the other end is connected to the first circuit. The first branch and the second branch are connected in parallel, and the second solenoid valve is connected in series on the second branch.

[0009] Furthermore, the first circuit is used to merge the output terminals of the first branch and the second branch. The positive electrolyte flows through the positive region of the stack reaction in the first circuit, reacts with the negative electrolyte in the stack, and then flows back to the positive electrolyte storage tank through the first circuit.

[0010] Furthermore, both the first solenoid valve and the second solenoid valve are flow proportional control valves.

[0011] Furthermore, the first circuit is also equipped with a positive electrode pressure sensor and a positive electrode flow sensor. The positive electrode pressure sensor is used to detect the pressure of the positive electrode electrolyte in the pipeline, and the positive electrode flow sensor is used to detect the flow rate of the positive electrode electrolyte in the pipeline.

[0012] Furthermore, the output end of the negative electrode electrolyte storage tank is connected to the second circulation pump through a pipeline, and the output end of the second circulation pump is connected to the third solenoid valve through a pipeline. The second circulation pump is used to provide power for the circulation of the negative electrode electrolyte and drive the negative electrode electrolyte to flow in the pipeline.

[0013] Furthermore, one end of the second circuit is connected to the third solenoid valve, and the other end of the second circuit is connected to the negative electrode electrolyte storage tank. The negative electrode electrolyte flows through the negative electrode region of the fuel cell reaction in the second circuit, reacts with the positive electrode electrolyte in the fuel cell, and then flows back to the negative electrode electrolyte storage tank through the second circuit.

[0014] Furthermore, the second circuit is also equipped with a negative electrode pressure sensor and a negative electrode flow sensor. The negative electrode pressure sensor is used to detect the pressure of the negative electrode electrolyte in the pipeline, and the negative electrode flow sensor is used to detect the flow rate of the negative electrode electrolyte in the pipeline.

[0015] Furthermore, the third solenoid valve is a flow proportional control valve.

[0016] The beneficial effects of this invention are as follows: The vanadium redox flow battery heat exchange pipeline system of this invention includes a positive electrode pipeline module and a negative electrode pipeline module. The positive electrode pipeline module is used for the circulation and temperature control of the positive electrode electrolyte, and the negative electrode pipeline module is used for the circulation of the negative electrode electrolyte. The positive electrode pipeline module includes a positive electrode electrolyte storage tank, a first circulation pump, a first branch, a second branch, a first solenoid valve and an evaporator disposed on the first branch, a second solenoid valve disposed on the second branch, and a first circuit. The opening degrees of the first and second solenoid valves are complementary. The negative electrode pipeline module includes a negative electrode electrolyte storage tank, a second circulation pump, a third solenoid valve, and a second circuit. This vanadium redox flow battery heat exchange pipeline system effectively reduces flow resistance and improves circulation efficiency while ensuring electrolyte cooling. It ensures that the pressure and flow rate of the positive and negative electrode electrolyte pipelines are the same, maintains a symmetrical positive and negative electrode reaction environment within the stack, enhances the stability of battery operation, and improves system performance and lifespan. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the all-vanadium redox flow battery heat exchange pipeline system 100 according to an embodiment of the present invention.

[0019] The component names and their numbers in the diagram are as follows: 100 vanadium redox flow battery heat exchange pipeline system; Positive electrode pipeline module 1, positive electrode electrolyte storage tank 11, first circulation pump 12, first branch 13, second branch 14, first solenoid valve 15, evaporator 16, second solenoid valve 17, first circuit 18, positive electrode pressure sensor 181, positive electrode flow sensor 182. Negative electrode pipeline module 2, negative electrode electrolyte storage tank 21, second circulation pump 22, third solenoid valve 23, second circuit 24, negative electrode pressure sensor 241, negative electrode flow sensor 242. Detailed Implementation

[0020] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0025] like Figure 1 As shown, this embodiment provides a vanadium redox flow battery heat exchange pipeline system 100, including a positive electrode pipeline module 1 and a negative electrode pipeline module 2. The positive electrode pipeline module 1 is used for the circulation and temperature control of the positive electrode electrolyte, while the negative electrode pipeline module 2 is used for the circulation of the negative electrode electrolyte.

[0026] In some embodiments, the positive electrode pipeline module 1 includes a positive electrode electrolyte storage tank 11, a first circulation pump 12, a first branch 13, a second branch 14, a first solenoid valve 15 and an evaporator 16 disposed on the first branch 13, a second solenoid valve 17 disposed on the second branch 14, and a first circuit 18. The positive electrode electrolyte storage tank 11 is used to store the positive electrode electrolyte, and the output end of the positive electrode electrolyte storage tank 11 is connected to the first circulation pump 12 through a pipeline. The first circulation pump 12 is used to provide power for the circulation of the positive electrode electrolyte, driving the positive electrode electrolyte to flow in the pipeline. The input end of the first circulation pump 12 is connected to the positive electrode electrolyte storage tank 11 through a pipeline, and the output end of the first circulation pump 12 is connected to the first branch 13 and the second branch 14 through pipelines respectively.

[0027] In some embodiments, one end of the first branch 13 is connected to the first circulating pump 12, and the other end of the first branch 13 is connected to the first circuit 18. A first solenoid valve 15 and an evaporator 16 are connected in series on the first branch 13. The first solenoid valve 15 acts as a switch on the first branch 13. When the electrolyte temperature is too high, the first solenoid valve 15 opens, allowing the electrolyte to flow through the evaporator 16 for cooling. The evaporator 16 is used to reduce the electrolyte temperature through heat exchange, thereby improving the stability of the electrolyte.

[0028] In some embodiments, one end of the second branch 14 is connected to the first circulation pump 12, and the other end of the second branch 14 is connected to the first circuit 18. The first branch 13 and the second branch 14 are connected in parallel, and the second solenoid valve 17 is connected in series with the second branch 14. The second solenoid valve 17 acts as a switch on the second branch 14. When the electrolyte temperature is normal, the second solenoid valve 17 opens, allowing the electrolyte to flow through the second branch 14, which can reduce the local flow resistance of the electrolyte and thus achieve rapid circulation of the electrolyte.

[0029] In some embodiments, the first circuit 18 is used to merge the output terminals of the first branch 13 and the second branch 14. The positive electrolyte flows through the positive region of the stack reaction in the first circuit 18, reacts with the negative electrolyte in the stack, and then flows back to the positive electrolyte storage tank 11 through the first circuit 18.

[0030] In some embodiments, the first solenoid valve 15 and the second solenoid valve 17 are both flow proportional control valves, capable of controlling the opening degree of their valves.

[0031] In some embodiments, in the positive electrode module 1, the opening degrees of the first solenoid valve 15 and the second solenoid valve 17 are complementary. When the electrolyte temperature is within the normal range, the second solenoid valve 17 is fully open, while the first solenoid valve 15 is fully closed. At this time, the electrolyte bypasses the evaporator 16 completely through the second branch 14, effectively eliminating the flow resistance of the evaporator. When the electrolyte temperature is too high, by adjusting the opening degrees of the first solenoid valve 15 and the second solenoid valve 17, part of the electrolyte flows through the evaporator 16 through the first branch 13 for cooling, while the remaining electrolyte bypasses through the second branch 14. This achieves both electrolyte cooling and reduces the proportion of flow resistance through the evaporator 16, balancing the relationship between cooling demand and flow resistance control.

[0032] In some embodiments, the first circuit 18 is further provided with a positive pressure sensor 181 and a positive flow sensor 182. The positive pressure sensor 181 is used to detect the pressure of the positive electrolyte in the pipeline. The positive flow sensor 182 is used to detect the flow rate of the positive electrolyte in the pipeline.

[0033] In some embodiments, the negative electrode pipeline module 2 includes a negative electrode electrolyte storage tank 21, a second circulation pump 22, a third solenoid valve 23, and a second circuit 24. The negative electrode electrolyte storage tank 21 stores the negative electrode electrolyte, and its output is connected to the second circulation pump 22 via a pipeline. The input of the second circulation pump 22 is connected to the negative electrode electrolyte storage tank 11 via a pipeline, and its output is connected to the third solenoid valve 23 via a pipeline. The second circulation pump 22 provides power for the circulation of the negative electrode electrolyte, driving the electrolyte to flow in the pipeline.

[0034] In some embodiments, the third solenoid valve 23 acts as an adjustment switch on the negative electrode pipeline module 2, enabling dynamic adjustment of the flow rate and pressure of the negative electrode electrolyte in the pipeline. One end of the second circuit 24 is connected to the third solenoid valve 23, and the other end of the second circuit 24 is connected to the negative electrode electrolyte storage tank 21. The negative electrode electrolyte flows through the negative electrode region of the fuel cell stack reaction within the second circuit 24, reacts with the positive electrode electrolyte within the fuel cell stack, and then flows back to the negative electrode electrolyte storage tank 21 through the second circuit 24.

[0035] In some embodiments, the second circuit 24 is further equipped with a negative electrode pressure sensor 241 and a negative electrode flow sensor 242. The negative electrode pressure sensor 241 is used to detect the pressure of the negative electrode electrolyte in the pipeline. The negative electrode flow sensor 242 is used to detect the flow rate of the negative electrode electrolyte in the pipeline.

[0036] In some embodiments, the third solenoid valve 23 is a flow proportional control valve capable of controlling its opening degree. In the negative electrode pipeline module 2, the third solenoid valve 23 provides feedback based on the pressure and flow data measured by the positive electrode pressure sensor 181 and the positive electrode flow sensor 182 in the positive electrode pipeline module 1. Based on this data, the third solenoid valve 23 dynamically adjusts its own opening degree, using the data from the positive electrode pressure sensor 181 and the flow sensor 182 as a reference, to match the detection values ​​of the negative electrode pressure sensor 241 and the flow sensor 242.

[0037] When the vanadium redox flow battery heat exchange pipeline system 100 of this utility model is working, it utilizes the flow proportional control characteristics of the first solenoid valve 15, the second solenoid valve 17, and the third solenoid valve 23 to achieve precise regulation of the flow rate of the positive electrolyte in the positive electrode circuit and the flow rate of the negative electrolyte in the negative electrode circuit. In the positive electrode pipeline module 1, the opening degrees of the first solenoid valve 15 and the second solenoid valve 17 are complementary. When the electrolyte temperature is normal, the second solenoid valve 17 is fully open and the first solenoid valve 15 is fully closed, and the electrolyte completely bypasses the evaporator 16 through the second branch 14, eliminating the evaporator flow resistance. When the electrolyte temperature is too high, the opening degrees of the first solenoid valve 15 and the second solenoid valve 17 are adjusted so that part of the electrolyte flows through the evaporator 16 through the first branch 13 to cool down, and part of it bypasses through the second branch 14, reducing the proportion of flow resistance flowing through the evaporator 16 and balancing the cooling and flow resistance requirements. For the negative electrode module 2, the third solenoid valve 23 provides feedback based on the pressure and flow measured by the positive electrode pressure sensor 181 and the positive electrode flow sensor 182 in the positive electrode module 1, and then dynamically adjusts the opening of the third solenoid valve 23. Using the data of the positive electrode pressure sensor 181 and the flow sensor 182 as a reference, the detection values ​​of the negative electrode pressure sensor 241 and the flow sensor 242 are matched to ensure that the pressure and flow in the positive electrode electrolyte pipeline and the negative electrode electrolyte pipeline are the same, maintain the symmetrical positive and negative electrode reaction environment in the stack, and thus ensure the efficient and stable operation of the vanadium redox flow battery. This achieves the synergistic effect of flow resistance optimization and flow and pressure parameter matching, and improves system performance and lifespan.

[0038] The vanadium redox flow battery heat exchange pipeline system 100 of this utility model includes a positive electrode pipeline module 1 and a negative electrode pipeline module 2. The positive electrode pipeline module 1 is used for the circulation and temperature control of the positive electrode electrolyte, and the negative electrode pipeline module 2 is used for the circulation of the negative electrode electrolyte. The positive electrode pipeline module 1 includes a positive electrode electrolyte storage tank 11, a first circulation pump 12, a first branch 13, a second branch 14, a first solenoid valve 15 and an evaporator 16 installed on the first branch 13, a second solenoid valve 17 installed on the second branch 14, and a first circuit 18. The opening degrees of the first solenoid valve 15 and the second solenoid valve 17 are complementary. The negative electrode pipeline module 2 includes a negative electrode electrolyte storage tank 21, a second circulation pump 22, a third solenoid valve 23, and a second circuit 24. This utility model's all-vanadium redox flow battery heat exchange pipeline system 100 can precisely control the flow rate, temperature, and flow resistance of the electrolyte. The positive electrode pipeline module 1, through the cooperation of the first solenoid valve 15 and the second solenoid valve 17, dynamically adjusts the flow rate through the evaporator 16 according to the electrolyte temperature, effectively reducing flow resistance and improving circulation efficiency while ensuring the electrolyte cooling effect. The third solenoid valve 23 of the negative electrode pipeline module 2 provides feedback adjustment based on the flow and pressure data of the positive electrode pipeline, ensuring that the pressure and flow rate of the positive and negative electrode electrolyte pipelines are the same, maintaining the symmetrical reaction environment of the positive and negative electrodes in the stack, and enhancing the stability of battery operation. It significantly improves the operating efficiency and service life of the all-vanadium redox flow battery. The coordinated work of the positive electrode pipeline module 1 and the negative electrode pipeline module 2 provides suitable working conditions for the battery, reduces performance loss caused by flow resistance and temperature changes, and ensures the efficient and stable operation of the flow battery.

[0039] Example 1 During the charging process of the vanadium redox flow battery system, the electrolyte temperature does not rise, and the evaporator 16 does not need to operate at this time. If the electrolyte flows through the evaporator 16, the increased flow resistance in the evaporator tubes 16 will lead to an increased pump load without any cooling effect.

[0040] The first solenoid valve 15 of the positive electrode module 1 remains fully closed, thus preventing flow in the first branch 13 and shutting off the evaporator 16 pipeline. The second solenoid valve 17 on the second branch 14 remains fully open, forming a resistance-free bypass. The third solenoid valve 23 on the negative electrode module 2 remains fully open, ensuring smooth circulation of the negative electrolyte. All the positive electrolyte in the positive electrode module 1 circulates through the second branch, bypassing the evaporator 16, eliminating the local flow resistance caused by the evaporator 16. Furthermore, since there is no added resistance from the evaporator 26 in the positive electrode module 1, the total flow resistance of the positive and negative electrode pipelines is essentially the same, ensuring that the pressure and flow rate in the pipelines remain consistent.

[0041] Example 2 When the vanadium redox flow battery system operates at a low frequency of one charge and one discharge per day, the system downtime is relatively long. In areas or seasons with low ambient temperatures, the electrolyte can exchange heat with the ambient temperature through temperature difference. During downtime, the electrolyte temperature can drop to a level where the evaporator 16 does not need to operate within a charge / discharge cycle. For example, if the electrolyte temperature drops to 30°C and rises to 34°C after one charge / discharge cycle, the electrolyte does not need to pass through the evaporator 16 for heat exchange and cooling during the charge / discharge cycle. Under this condition, the first solenoid valve 15 corresponding to the evaporator 16 on the first branch 13 remains fully closed, the second solenoid valve 17 on the second branch 14 remains fully open, and the third solenoid valve 23 on the negative electrode pipeline module 2 remains fully open. At this time, the first branch 13 corresponding to the evaporator 16 is closed, and the positive electrode electrolyte circulates entirely through the second branch 14, not flowing through the evaporator 16, thus reducing flow resistance. Even if the electrolyte temperature decreases during downtime, it remains within the discharge cycle. Evaporator 16 still needs to run for a period of time to lower the electrolyte temperature to below a safe level. For example, if the electrolyte temperature drops to 33°C, it will rise to 36°C after discharge. Under this condition, the vanadium redox flow battery system issues a command to control the first solenoid valve 17 on the first branch 13 to open to a preset first flow ratio, and the second solenoid valve 17 on the second branch 14 to open to a corresponding preset second flow ratio, so that some electrolyte flows through evaporator 16. This allows some electrolyte to flow through the electrolyte in the first branch 13. Heat exchange and cooling are performed to control the electrolyte temperature within a reasonable range. At the same time, the third solenoid valve 23 on the negative electrode pipeline module is matched according to the pressure value on the positive electrode pipeline module 1, thereby opening the third solenoid valve 23 to a preset third flow ratio, so that the pressure of the positive electrode pipeline module 1 is consistent. At this time, the positive electrode electrolyte flows through the first branch 13 and the second branch 14 in proportion. Since the second branch 14 diverts a portion of the electrolyte, the electrolyte flow through the evaporator 4 of the first branch 13 is reduced, and the corresponding flow resistance is also reduced.

[0042] Example 3 In certain operating conditions, such as when the vanadium redox flow battery system is used to enhance grid regulation capabilities or for power supply and demand in factories, where full-power operation is not usually required, the system will adjust the discharge power according to supply and demand. In this case, the heat generated by the system per unit time is lower than that during full-power operation. At this time, the flow rates on the second branch 14 and the first branch 13 need to be adjusted in stages according to the operating power. The battery management system issues instructions, and the first solenoid valve 15 on the first branch 13 opens to the first preset ratio, and the second solenoid valve 17 on the second branch 14 opens to the second preset ratio. If the discharge power increases and the electrolyte temperature rises significantly, the valve opening of the first solenoid valve 15 needs to be increased and the valve opening of the second solenoid valve 17 needs to be decreased. If the electrolyte temperature drops significantly after the power is reduced, the valve opening of the first solenoid valve 15 can be decreased and the valve opening of the second solenoid valve 17 can be increased. The third solenoid valve 23 on the negative electrode line is matched according to the pressure value on the positive electrode line module 1, and the opening of the third solenoid valve 23 is adjusted to make the pressure of the positive and negative electrode lines consistent.

[0043] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A heat exchange piping system for a vanadium redox flow battery, characterized by, include: The system includes a positive electrode module and a negative electrode module. The positive electrode module is used for the circulation and temperature control of the positive electrode electrolyte, and the negative electrode module is used for the circulation of the negative electrode electrolyte. The positive electrode module includes a positive electrode electrolyte storage tank, a first circulation pump, a first branch, a second branch, a first solenoid valve and an evaporator disposed on the first branch, a second solenoid valve disposed on the second branch, and a first circuit. The opening degrees of the first solenoid valve and the second solenoid valve are complementary. The negative electrode module includes a negative electrode electrolyte storage tank, a second circulation pump, a third solenoid valve, and a second circuit.

2. The vanadium redox flow battery heat exchange plumbing system of claim 1, wherein, One end of the first branch is connected to the first circulating pump, and the other end is connected to the first circuit. The first solenoid valve and the evaporator are connected in series on the first branch. The first solenoid valve acts as a switch on the first branch. When the electrolyte temperature is too high, the first solenoid valve opens, allowing the electrolyte to flow through the evaporator to cool down.

3. The vanadium redox flow battery heat exchange plumbing system of claim 2, wherein, One end of the second branch is connected to the first circulating pump, and the other end is connected to the first circuit. The first branch and the second branch are connected in parallel, and the second solenoid valve is connected in series on the second branch.

4. The vanadium redox flow battery heat exchange plumbing system of claim 1, wherein, The first circuit is used to merge the output terminals of the first branch and the second branch. The positive electrolyte flows through the positive region of the stack reaction in the first circuit, reacts with the negative electrolyte in the stack, and then flows back to the positive electrolyte storage tank through the first circuit.

5. The vanadium redox flow battery heat exchange plumbing system of claim 1, wherein, Both the first solenoid valve and the second solenoid valve are flow proportional control valves.

6. The all-vanadium redox flow battery heat exchange pipeline system according to claim 1, characterized in that, The first circuit is also equipped with a positive electrode pressure sensor and a positive electrode flow sensor. The positive electrode pressure sensor is used to detect the pressure of the positive electrode electrolyte in the pipeline, and the positive electrode flow sensor is used to detect the flow rate of the positive electrode electrolyte in the pipeline.

7. The vanadium redox flow battery heat exchange plumbing system of claim 1, wherein, The output end of the negative electrode electrolyte storage tank is connected to the second circulation pump through a pipeline, and the output end of the second circulation pump is connected to the third solenoid valve through a pipeline. The second circulation pump is used to provide power for the circulation of the negative electrode electrolyte and drive the negative electrode electrolyte to flow in the pipeline.

8. The vanadium redox flow battery heat exchange plumbing system of claim 1, wherein, One end of the second circuit is connected to the third solenoid valve, and the other end of the second circuit is connected to the negative electrode electrolyte storage tank. The negative electrode electrolyte flows through the negative electrode region of the stack reaction in the second circuit. After reacting with the positive electrode electrolyte in the stack, it flows back to the negative electrode electrolyte storage tank through the second circuit.

9. The vanadium redox flow battery heat exchange plumbing system of claim 1, wherein, The second circuit is also equipped with a negative electrode pressure sensor and a negative electrode flow sensor. The negative electrode pressure sensor is used to detect the pressure of the negative electrode electrolyte in the pipeline, and the negative electrode flow sensor is used to detect the flow rate of the negative electrode electrolyte in the pipeline.

10. The vanadium redox flow battery heat exchange plumbing system of claim 1, wherein, The third solenoid valve is a flow proportional control valve.

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