Tubular heat exchanger and flow battery system

Abstract

The utility model discloses a tubular heat exchanger and a flow battery system, the tubular heat exchanger comprises: a housing, a heat exchange cavity is formed in the housing, and the housing is provided with a liquid inlet and a liquid outlet which are communicated with the heat exchange cavity; the heat exchange pipes are arranged in the heat exchange cavity, are used for guiding electrolyte, are made of graphite modified nylon and are in a thread shape or a corrugated pipe shape; the sealing plates are arranged at the two ends of the heat exchange pipe, the heat exchange pipe penetrates through the sealing plates, and the sealing plates are connected with the outer wall of the heat exchange pipe and the inner wall of the shell in a sealed mode; the pipe sealing joints are connected to the two ends of the shell in a sealed mode, and joint parts used for leading in or discharging electrolyte are arranged on the pipe sealing joints. According to the heat exchange tube, the heat exchange surface area can be increased to effectively improve the heat exchange performance, the heat conduction performance of the heat exchange tube can be remarkably improved, and compared with a titanium alloy material, the cost of the heat exchange tube is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a shell-and-tube heat exchanger and a flow battery system. Background Art

[0002] In a flow battery energy storage system, a heat exchanger is a device used to cool the electrolyte to maintain the long-term high-load normal operation of the stack, and it plays an important role in the system thermal management. A heat exchanger is a device that realizes heat transfer between materials among two or more fluids at different temperatures. Its function is to transfer heat from a fluid with a higher temperature to a fluid with a lower temperature, so that the fluid temperature reaches the specified index of the process to meet the requirements of the process conditions.

[0003] In a flow battery system, when the electrolyte passes through the heat exchange tube, heat exchange is carried out with the external coolant to achieve the purpose of rapid cooling. However, most of the heat exchange tubes on the market are made of metal materials. The electrolyte of the flow battery is generally strong acid or strong base, and the corrosion resistance of ordinary stainless steel is difficult to meet the requirements. The price of titanium alloy is too expensive, and the acid and alkali resistance of ordinary plastics can meet the requirements, but they are generally thermal insulation materials with very low heat exchange efficiency and are difficult to meet the heat exchange requirements of the heat exchanger. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a shell-and-tube heat exchanger and a flow battery system, which have the advantages of improving heat exchange efficiency, strong corrosion resistance, and low cost.

[0005] The purpose of the utility model is realized by adopting the following technical solutions:

[0006] According to the first aspect of the embodiments of the present disclosure, a shell-and-tube heat exchanger is provided, including:

[0007] A housing, an inner heat exchange cavity is formed inside the housing, and a liquid inlet and a liquid outlet communicating with the heat exchange cavity are provided on the housing;

[0008] A plurality of heat exchange tubes disposed in the heat exchange cavity for guiding the electrolyte, the heat exchange tubes are made of graphite-modified nylon, and the heat exchange tubes are in a threaded shape or a corrugated pipe shape;

[0009] Sealing plates disposed at both ends of the heat exchange tubes, the heat exchange tubes pass through the sealing plates, and the sealing plates are hermetically connected to the outer wall of the heat exchange tubes and the inner wall of the housing; and,

[0010] Sealing pipe joints hermetically connected to both ends of the housing, and connection heads for introducing or discharging the electrolyte are provided on the sealing pipe joints.

[0011] To implement the above technical solution, during use, the coolant is input from the liquid inlet into the heat exchange cavity, undergoes heat exchange with the heat exchange tubes, and then is discharged from the liquid outlet. The electrolyte is input from a sealing pipe joint on one side into each heat exchange tube, undergoes heat exchange with the heat exchange tubes and the coolant, and then is discharged from the sealing pipe joint on the other side. The electrolyte first undergoes the first convective heat transfer with the inner wall of the heat exchange tube, the inner wall and the outer wall of the heat exchange tube conduct heat once, and finally the outer wall of the heat exchange tube undergoes the second convective heat transfer with the coolant in the heat exchange cavity, thereby cooling the electrolyte; since the heat exchange tubes are in a threaded or corrugated shape, the overall surface area of the heat exchange tubes can be increased by 20%-30%. The size of the increase in the overall surface area can be changed according to the thickness of the threads or the curvature of the corrugations. After the surface area increases, the heat exchange performance can be effectively improved. By using graphite-modified nylon as the material to process the heat exchange tubes, while improving the corrosion resistance and high-temperature resistance of the heat exchange tubes, the thermal conductivity coefficient of the heat exchange tubes can be increased, thereby improving the heat exchange efficiency; in the heat exchange tubes made of graphite-modified nylon, the internal graphite particles or graphene sheets can form a heat conduction network, thereby significantly improving its heat conduction performance, and compared with titanium alloy materials, its cost is lower.

[0012] In some exemplary embodiments, at least two flow guiding plates are provided in the heat exchange cavity. Each heat exchange tube passes through the flow guiding plates. The flow guiding plates are arranged at intervals, and the arrangement positions of adjacent flow guiding plates are opposite. The cooling medium is input from the liquid inlet, exchanges direction after passing through each flow guiding plate, and is discharged from the liquid outlet.

[0013] To implement the above technical solution, the flow guiding plates can force the coolant to have a certain directionality when flowing and extend the flow path of the coolant, thereby effectively improving the heat exchange and cooling effect.

[0014] In some exemplary embodiments, the flow guiding plate is an arc plate, and the central angle of the flow guiding plate is α, where 180° ≤ α ≤ 270°.

[0015] To implement the above technical solution, it is necessary for the coolant to cross each flow guiding plate when flowing, thereby playing a role in extending the flow path of the coolant.

[0016] In some exemplary embodiments, the flow guiding plates are provided in three groups, including a first flow guiding plate, a second flow guiding plate, and a third flow guiding plate. The first flow guiding plate is located on the liquid outlet direction side of the liquid inlet. The second flow guiding plate is arranged in the middle of the housing and is opposite to the first flow guiding plate. The third flow guiding plate is located on the liquid inlet direction side of the liquid outlet.

[0017] To implement the above technical solution, while ensuring the smooth flow of the coolant, the coolant can flow along a wavy path, improving the heat exchange efficiency.

[0018] In some exemplary embodiments, the pipe sealing joint and the housing are hermetically connected through a flange.

[0019] Implementing the above technical solution enables convenient connection and high sealing performance.

[0020] In some exemplary embodiments, flange plates are provided on the liquid inlet, the liquid outlet, and the connection head.

[0021] Implementing the above technical solution facilitates hermetic connection with an external pipeline.

[0022] In some exemplary embodiments, a support is provided on a side of the housing opposite to the liquid inlet and the liquid outlet.

[0023] Implementing the above technical solution facilitates stable placement of the heat exchanger.

[0024] According to a second aspect of the embodiments of the present disclosure, a flow battery system is provided, including:

[0025] A battery stack, with a positive electrode connection side and a negative electrode connection side on both sides of the battery stack respectively;

[0026] At least two liquid storage tanks, with at least one of the liquid storage tanks connected to the positive electrode connection side and at least one of the liquid storage tanks connected to the negative electrode connection side respectively;

[0027] At least two shell-and-tube heat exchangers as described in the first aspect, the shell-and-tube heat exchangers are arranged between the battery stack and the liquid storage tanks, and at least one of the shell-and-tube heat exchangers is connected to the positive electrode connection side and at least one of the shell-and-tube heat exchangers is connected to the negative electrode connection side respectively, and the shell-and-tube heat exchangers are connected to a coolant supply device; and,

[0028] A conveying unit for realizing the circulation of the electrolyte.

[0029] Implementing the above technical solution, during use, a positive electrode electrolyte and a negative electrode electrolyte are respectively stored in the two liquid storage tanks and are respectively connected to the positive electrode connection side and the negative electrode connection side. The electrolyte is circulated into the battery stack through the conveying unit, thereby generating an electrochemical reaction to produce electric energy for power supply. During the circulation process, the electrolyte passes through the heat exchanger, and through the heat exchange tubes distributed in an array therein, the electrolyte exchanges heat with the heat exchange tubes and the coolant, playing a role in cooling the coolant and ensuring the continuous and stable operation of the flow battery system.

[0030] In some exemplary embodiments, at least one of the liquid storage tanks is connected to the positive electrode connection side through a first liquid delivery pipe and a first liquid return pipe, and at least one of the other liquid storage tanks is connected to the negative electrode connection side through a second liquid delivery pipe and a second liquid return pipe, and at least one shell-and-tube heat exchanger is respectively connected to the first liquid return pipe and the second liquid return pipe.

[0031] In some exemplary embodiments, the conveying unit includes: a first conveying unit connected to the positive electrode connection side and a second conveying unit connected to the negative electrode connection side. The first conveying unit is connected to the first infusion tube and / or the first liquid return tube, and the second conveying unit is connected to the second infusion tube and / or the second liquid return tube.

[0032] In summary, compared with the prior art, the present utility model has the following beneficial effects:

[0033] In an embodiment of the present utility model, a shell-and-tube heat exchanger and a liquid flow battery system are provided. The shell-and-tube heat exchanger includes: a shell, an inner heat exchange cavity is formed inside the shell, and a liquid inlet and a liquid outlet communicating with the heat exchange cavity are provided on the shell; a plurality of heat exchange tubes arranged in the heat exchange cavity for guiding electrolyte, the heat exchange tubes are made of graphite-modified nylon, and the heat exchange tubes are in a threaded or corrugated shape; sealing plates arranged at both ends of the heat exchange tubes, the heat exchange tubes pass through the sealing plates, and the sealing plates are hermetically connected to the outer wall of the heat exchange tubes and the inner wall of the shell; and, sealing pipe joints hermetically connected to both ends of the shell, and connection parts for introducing or discharging electrolyte are provided on the sealing pipe joints. When in use, the coolant is input into the heat exchange cavity from the liquid inlet to exchange heat with the heat exchange tubes and then discharged from the liquid outlet. The electrolyte is input into each heat exchange tube from one side of the sealing pipe joint, exchanges heat with the heat exchange tubes and the coolant, and then is discharged from the other side of the sealing pipe joint. The electrolyte first performs a first convective heat transfer with the inner wall of the heat exchange tube, the inner wall and the outer wall of the heat exchange tube perform a heat conduction, and finally the outer wall of the heat exchange tube and the coolant in the heat exchange cavity perform a second convective heat transfer, thereby cooling the electrolyte; since the heat exchange tubes are in a threaded or corrugated shape, the overall surface area of the heat exchange tubes can be increased by 20%-30%. The size of the overall surface area increase can be changed according to the thickness of the threads or the radian of the corrugations. After the surface area is increased, the heat exchange performance can be effectively improved. By using graphite-modified nylon as the material to process the heat exchange tubes, while improving the corrosion resistance and high-temperature resistance of the heat exchange tubes, the thermal conductivity coefficient of the heat exchange tubes can be increased, thereby improving the heat exchange efficiency; in the heat exchange tubes made of graphite-modified nylon, the internal graphite particles or graphene sheets can form a heat conduction network, thereby significantly improving its thermal conductivity, and compared with titanium alloy materials, its cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of the shell-and-tube heat exchanger in an embodiment of the present utility model.

[0035] Figure 2 It is a cross-sectional view of the shell-and-tube heat exchanger in an embodiment of the present utility model.

[0036] Figure 3This is a schematic structural diagram of the heat exchange tube in the embodiment of the present utility model.

[0037] Figure 4 This is a schematic structural diagram of the flow battery system in the embodiment of the present utility model.

[0038] The corresponding component names represented by the numbers and letters in the figure:

[0039] 10. Shell and tube heat exchanger; 11. Shell; 111. Liquid inlet; 112. Liquid outlet; 113. Support; 12. Heat exchange tube; 13. Sealing plate; 14. Sealing pipe joint; 141. Connection part; 142. Flange; 15. Baffle plate; 20. Liquid storage tank; 23. First liquid delivery pipe; 24. First liquid return pipe; 25. Second liquid delivery pipe; 26. Second liquid return pipe; 30. Battery stack; 31. Positive connection side; 32. Negative connection side; 41. First delivery unit; 42. Second delivery unit; 50. Coolant supply device. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0041] As Figures 1 to 3 shown, in the first aspect of the embodiment of the present utility model, a shell and tube heat exchanger 10 is provided, including: a shell 11, an inner heat exchange cavity is formed in the shell 11, and a liquid inlet 111 and a liquid outlet 112 communicating with the heat exchange cavity are provided on the shell 11; a plurality of heat exchange tubes 12 arranged in the heat exchange cavity for guiding the electrolyte, the heat exchange tubes 12 are made of graphite modified nylon, and the heat exchange tubes 12 are in a threaded or corrugated shape; sealing plates 13 arranged at both ends of the heat exchange tubes 12, the heat exchange tubes 12 pass through the sealing plates 13, and the sealing plates 13 are hermetically connected to both the outer wall of the heat exchange tubes 12 and the inner wall of the shell 11; and, sealing pipe joints 14 hermetically connected to both ends of the shell 11, and connection parts 141 for introducing or discharging the electrolyte are provided on the sealing pipe joints 14.

[0042] Specifically, the housing 11 can be made of PPH material. The liquid inlet 111 and the liquid outlet 112 are respectively arranged near both ends of the housing 11 and on the same side. The liquid inlet 111 and the liquid outlet 112 can be connecting pipes welded and sealed to the housing 11. The heat exchange tubes 12 are fixed to the sealing plate 13 in an array manner. The threaded and corrugated shapes of the heat exchange tubes 12 can be formed by turning on a lathe or integrally formed by injection molding. Graphite-modified nylon can use existing materials. It can be that graphite particles are fully mixed with nylon so that the graphite particles can be dispersed and filled in the nylon matrix, or graphene sheets can be filled in the nylon matrix. With nylon as the base, its heat resistance is better than that of PP and Teflon, and it can maintain its physical properties at higher temperatures. Moreover, its mechanical strength and wear resistance are also higher, and the wall thickness of the heat exchange tubes 12 can be made thinner to further increase the overall heat transfer coefficient of the heat exchanger.

[0043] For the heat exchange performance of the heat exchange tubes 12, it is usually reflected by the overall heat transfer coefficient as a performance parameter, generally represented by K, and its calculation formula is:

[0044] Among them,

[0045] K - overall heat transfer coefficient, W / (m 2 *℃);

[0046] α i , α0 - convective heat transfer coefficients of the fluids on the inner and outer sides of the heat exchange tubes, W / (m 2 *℃);

[0047] R si , R so - fouling heat resistances on the inner and outer surfaces of the heat exchange tubes, m 2 *℃ / W;

[0048] d i , d o , d m - inner diameter, outer diameter and average diameter of the heat exchange tubes, m;

[0049] λ - heat conduction coefficient of the heat exchange tube wall, W / (M*℃);

[0050] b - wall thickness of the heat exchange tube, m.

[0051] Under the same structure and size, the thermal conductivity (λ) of the heat exchange tube 12 plays a decisive role in the overall heat transfer coefficient of the heat exchanger. Currently, most of the heat exchange tubes 12 on the market are made of PP or Teflon, and their thermal conductivity is between 0.13 - 0.24 W / (m·K). The specific value will be affected by factors such as the density, crystallinity, and temperature of the material. When using graphite-modified nylon to make the heat exchange tube 12, when graphite is added to nylon, graphite particles or graphene sheets can form a thermal conduction network, thus significantly improving the thermal conductivity of the composite material. The higher the content of graphite, the smaller the particle size of the graphite particles, and the better the dispersion of graphite in the nylon matrix, the higher its thermal conductivity. The thermal conductivity of graphite-modified nylon can be obtained through experimental measurement or estimated through theoretical calculation. The range of the thermal conductivity of graphite-modified nylon can vary from a level close to that of pure nylon (about 0.2 - 0.3 W / (m·K)) to hundreds of W / (m·K).

[0052] The sealing plate 13 can be fixed to the inner wall of the housing 11 by welding and form a seal. A number of through holes are provided on the sealing plate 13 for the heat exchange tubes 12 to pass through. The heat exchange tubes 12 and the through holes can be sealed and connected by sealant or can be sealed and fixed by welding; the sealing pipe joint 14 and the housing 11 are sealed and connected by a flange, which is convenient to connect and has high sealing performance. Flange plates 142 are provided on the liquid inlet 111, the liquid outlet 112, and the joint part 141 to facilitate sealing connection with external pipelines. A support 113 is provided on the side of the housing 11 opposite to the liquid inlet 111 and the liquid outlet 112 to facilitate the stable placement of the heat exchanger. In some embodiments, the support 113 can be replaced by an adjustable lifting bracket.

[0053] Furthermore, at least two flow guiding plates 15 are provided in the heat exchange cavity. The flow guiding plates 15 can be fixed to the inner wall of the housing 11 by welding. Each heat exchange tube 12 passes through the flow guiding plates 15. A number of through holes are also provided on the heat exchange tubes 12 for the heat conduction tubes to pass through. The flow guiding plates 15 are spaced apart, and the arrangement positions of adjacent flow guiding plates 15 are opposite. The cooling medium is input from the liquid inlet 111, passes through each flow guiding plate 15 after changing direction, and is discharged from the liquid outlet 112. The flow guiding plates 15 can force the coolant to have a certain directionality during flow and extend the flow path of the coolant, thereby effectively improving the heat exchange and cooling effect.

[0054] Among them, the flow guiding plate 15 is an arc plate, and the central angle of the flow guiding plate 15 is α, 180° ≤ α ≤ 270°. In this embodiment, the central angle of the flow guiding plate 15 is 180°, that is, it is semi-circular, so that the coolant needs to cross each flow guiding plate 15 when flowing, thereby playing a role in extending the flow path of the coolant.

[0055] In this embodiment, the flow guide plates 15 are specifically arranged in three groups, including a first flow guide plate 15, a second flow guide plate 15, and a third flow guide plate 15. The first flow guide plate 15 is located on the side of the liquid outlet direction of the liquid inlet 111. The second flow guide plate 15 is arranged in the middle of the housing 11 and is opposite to the first flow guide plate 15. The third flow guide plate 15 is located on the side of the liquid inlet direction of the liquid outlet 112. While ensuring the smooth flow of the coolant, the coolant can flow along a wavy path, improving the heat exchange efficiency.

[0056] During processing, first, a number of heat exchange tubes 12 are processed by a lathe machine or by injection molding. The flow guide plates 15 are welded and fixed at predetermined positions inside the housing 11. Then, the heat exchange tubes 12 are passed through the flow guide plates 15 according to a preset arrangement form. Then, each heat exchange plate is welded and sealed with the sealing plate 13. Then, the sealing plate 13 is welded and fixed at both ends of the housing 11. Then, both ends of the housing 11 are hermetically connected to the sealing pipe joints 14 by means of flanges, and the assembly of the heat exchanger can be completed. Finally, airtightness tests are respectively carried out on the heat exchange tubes 12 and the housing 11 to detect whether each component forms a perfect seal.

[0057] During use, the coolant is input from the liquid inlet 111 into the heat exchange cavity for heat exchange with the heat exchange tubes 12 and then discharged from the liquid outlet 112. The electrolyte is input into each heat exchange tube 12 from one side of the sealing pipe joint 14. After heat exchange with the heat exchange tubes 12 and the coolant, it is discharged from the sealing pipe joint 14 on the other side. The electrolyte first conducts the first convective heat transfer with the inner wall of the heat exchange tube 12. The inner wall and the outer wall of the heat exchange tube 12 conduct a heat conduction. Finally, the outer wall of the heat exchange tube 12 conducts the second convective heat transfer with the coolant in the heat exchange cavity, thereby cooling the electrolyte. Since the heat exchange tubes 12 are in a threaded or corrugated shape, the overall surface area of the heat exchange tubes 12 can be increased by 20% - 30%. The size of the increase in the overall surface area can be changed according to the thickness of the set threads or the radian of the corrugations. After the surface area increases, the heat exchange performance can be effectively improved. By using graphite-modified nylon as the material to process the heat exchange tubes 12, while improving the corrosion resistance and high-temperature resistance of the heat exchange tubes 12, the thermal conductivity coefficient of the heat exchange tubes 12 can be increased, thereby improving the heat exchange efficiency. In the heat exchange tubes 12 made of graphite-modified nylon, the internal graphite particles or graphene sheets can form a heat conduction network, thereby significantly improving its heat conduction performance. And compared with titanium alloy materials, its cost is lower.

[0058] The second aspect of the embodiment of the present utility model provides a flow battery system, such as Figure 4As shown in the figure, it includes: a battery stack 30, with a positive connection side 31 and a negative connection side 32 on both sides of the battery stack 30; at least two liquid storage tanks 20, with at least one liquid storage tank 20 connected to the positive connection side 31 and the negative connection side 32 respectively; at least two shell-and-tube heat exchangers 10 as in the first aspect, the shell-and-tube heat exchangers 10 are arranged between the battery stack 30 and the liquid storage tanks 20, and at least one shell-and-tube heat exchanger 10 is connected to the positive connection side 31 and the negative connection side 32 respectively, and the shell-and-tube heat exchangers 10 are connected to a coolant supply device 50; and a conveying unit for realizing the circulation of the electrolyte solution.

[0059] Specifically, at least one of the liquid storage tanks 20 is connected to the positive connection side 31 through a first liquid delivery pipe 23 and a first liquid return pipe 24, and at least one of the other liquid storage tanks 20 is connected to the negative connection side 32 through a second liquid delivery pipe 25 and a second liquid return pipe 26. In this embodiment, a positive electrode liquid storage tank 20 for storing positive electrode electrolyte solution and a negative electrode liquid storage tank 20 for storing negative electrode electrolyte solution are provided, and at least one shell-and-tube heat exchanger 10 is connected to the first liquid return pipe 24 and the second liquid return pipe 26 respectively.

[0060] In this embodiment, the first liquid return pipe 24 and the second liquid return pipe 26 are respectively hermetically connected to the flange 142 on the sealing pipe joint 14. The coolant supply device 50 can adopt existing supply equipment. Its liquid outlet end is hermetically connected to the flange 142 on the liquid inlet 111 through a liquid inlet pipe, and the liquid inlet end is hermetically connected to the flange 142 on the liquid outlet 112, so as to form a cyclic use of the coolant, and the coolant can be cooled by a refrigeration device arranged in the supply equipment.

[0061] The conveying unit includes: a first conveying unit 41 connected to the positive connection side 31 and a second conveying unit 42 connected to the negative connection side 32. The first conveying unit 41 is connected to the first liquid delivery pipe 23 and / or the first liquid return pipe 24, and the second conveying unit 42 is connected to the second liquid delivery pipe 25 and / or the second liquid return pipe 26. In this embodiment, both the first conveying unit 41 and the second conveying unit 42 adopt liquid infusion pumps. The first conveying unit 41 is connected to the first liquid delivery pipe 23, and the second conveying unit 42 is connected to the second liquid delivery pipe 25.

[0062] During use, the positive electrode electrolyte solution and the negative electrode electrolyte solution are respectively stored in the two liquid storage tanks 20 and are respectively connected to the positive connection side 31 and the negative connection side 32. The electrolyte solution is cyclically injected into the battery stack 30 through the conveying unit, so as to generate electric energy through an electrochemical reaction for power supply. During the circulation process, the electrolyte solution will pass through the heat exchanger, and through the heat exchange tubes 12 arranged in an array form therein, the electrolyte solution exchanges heat with the heat exchange tubes 12 and the coolant, playing a role in cooling the coolant and ensuring the continuous and stable operation of the flow battery system.

[0063] The above embodiments only illustrate several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several variations and improvements can be made. These are all equivalent modifications and evolutions of the above embodiments based on the essential technology of the present utility model, and all of these fall within the protection scope of the present utility model.

Claims

1. A shell and tube heat exchanger, characterized in that: include: A shell, wherein a heat exchange cavity is formed inside the shell, and the shell is provided with a liquid inlet and a liquid outlet communicating with the heat exchange cavity; A plurality of heat exchange tubes arranged in the heat exchange cavity for conducting electrolyte, wherein the heat exchange tubes are made of graphite-modified nylon and are in a threaded or corrugated tube shape; Sealing plates are arranged at both ends of the heat exchange tube, the heat exchange tube passes through the sealing plates, and the sealing plates are sealed and connected to the outer wall of the heat exchange tube and the inner wall of the shell; and The sealing pipe joints are sealed and connected to the two ends of the shell, and the sealing pipe joints are provided with joint parts for introducing or discharging electrolyte.

2. The shell and tube heat exchanger according to claim 1, characterized in that: At least two guide plates are arranged in the heat exchange chamber, and each of the heat exchange tubes passes through the guide plates. The guide plates are arranged at intervals, and the adjacent guide plates are arranged at opposite positions. The cooling medium is input from the liquid inlet, passes through each of the guide plates, and is discharged from the liquid outlet after being reversed.

3. The shell and tube heat exchanger according to claim 2, characterized in that: The guide plate is an arc plate, and the central angle of the guide plate is α, 180°≤α≤270°.

4. The shell and tube heat exchanger according to claim 2 or 3, characterized in that: The guide plates are arranged in three groups, including a first guide plate, a second guide plate and a third guide plate. The first guide plate is located on the liquid outlet side of the liquid inlet, the second guide plate is arranged in the middle of the shell and opposite to the first guide plate, and the third guide plate is located on the liquid outlet side of the liquid inlet.

5. The shell and tube heat exchanger according to claim 1, characterized in that: The sealing pipe joint is sealed and connected to the shell through a flange.

6. The shell and tube heat exchanger according to claim 1, characterized in that: The liquid inlet, the liquid outlet and the joint are all provided with flanges.

7. The shell and tube heat exchanger according to claim 1, characterized in that: A support is provided on one side of the shell body opposite to the liquid inlet and the liquid outlet.

8. A liquid flow battery system, characterized in that: include: A battery stack, wherein two sides of the battery stack are respectively a positive electrode connection side and a negative electrode connection side; At least two liquid storage tanks, the positive electrode connection side and the negative electrode connection side are respectively connected to at least one of the liquid storage tanks; At least two shell-and-tube heat exchangers according to any one of claims 1 to 7, the shell-and-tube heat exchangers are arranged between the battery stack and the liquid storage tank, and the positive electrode connection side and the negative electrode connection side are respectively connected to at least one of the shell-and-tube heat exchangers, and the shell-and-tube heat exchangers are connected to a coolant supply device; and, Delivery unit for circulating the electrolyte.

9. The liquid flow battery system according to claim 8, characterized in that: At least one of the liquid storage tanks is connected to the positive electrode connection side through a first liquid infusion pipe and a first liquid return pipe, and at least another of the liquid storage tanks is connected to the negative electrode connection side through a second liquid infusion pipe and a second liquid return pipe, and at least one of the shell-and-tube heat exchangers is connected to the first liquid return pipe and the second liquid return pipe, respectively.

10. The liquid flow battery system according to claim 9, characterized in that: The conveying unit includes: a first conveying unit connected to the positive electrode connection side and a second conveying unit connected to the negative electrode connection side, the first conveying unit is connected to the first infusion pipe and / or the first return pipe, and the second conveying unit is connected to the second infusion pipe and / or the second return pipe.

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