Energy storage pipeline device capable of actively reducing temperature difference and energy storage system

Abstract

The utility model relates to an energy storage pipeline device capable of actively reducing temperature difference and an energy storage system. The energy storage pipeline device is connected with cooling equipment and used for reducing the temperature of a cooling target. Comprising a first pipe connected with the output end of cooling equipment, a second pipe connected with the output end of the cooling equipment, a third pipe, a fourth pipe and an active temperature equalizing module, the first pipe, the second pipe, the third pipe, the fourth pipe and the active temperature equalizing module can form two different circulation paths which are switched through the active temperature equalizing module. The energy storage pipeline device capable of actively reducing the temperature difference is provided with the two circulation passages, and the two circulation passages can be switched through the active temperature equalizing module, so that the flowing direction of cooling liquid in a cooling target is changed, the phenomenon that the cooling effect of the cooling target is not uniform is avoided, the temperature difference in the cooling target is reduced, and the service life of the cooling target is prolonged. And stable operation of the energy storage system is ensured.

Description

Technical Field

[0001] The utility model relates to the field of energy storage equipment, and in particular to an energy storage pipeline device and an energy storage system for actively reducing temperature differences. Background Art

[0002] With the widespread application of electrochemical energy storage systems such as lithium-ion batteries in the energy storage field, the market is paying more and more attention to the safety and cycle life of energy storage systems. The performance of energy storage systems is mainly determined by the performance and consistency of battery cells. When batteries operate at different temperatures, their performance will be different. Therefore, the consistency of battery operating temperature becomes a key external factor affecting the consistency of battery performance. Specifically, the temperature difference between battery cells has an important impact on the performance and life of energy storage systems.

[0003] Air cooling technology has been widely used in the energy storage field due to its advantages such as easy installation and maintenance and mature technology. However, its disadvantages such as weak heat exchange capacity, large space requirements and large temperature difference have caused its market share to gradually decrease. In contrast, liquid cooling has become the mainstream heat dissipation method for energy storage systems due to its strong heat exchange capacity and small volume.

[0004] However, due to the coolant flow and heat exchange characteristics of the liquid cooling plate, the coolant temperature at the inlet of the battery pack is always lower than the outlet coolant temperature. This leads to inconsistent heat exchange of the cells at the inlet and outlet of the battery pack, making the temperature of the cells at the outlet always higher than the temperature of the cells at the inlet. The long-term operation of the cells in different environments will affect the overall performance of the energy storage system due to their performance differences.

[0005] Therefore, in order to improve the performance and life of the energy storage system, it is necessary to further optimize the heat dissipation solution, reduce the temperature difference between battery cells, and ensure the performance consistency of the battery cells operating in different environments. Utility Model Content

[0006] In view of this, the utility model provides an energy storage pipeline device that actively reduces temperature differences, has two circulation paths, and the two circulation paths can be switched through an active temperature equalization module, thereby changing the direction of coolant flow in the cooling target, avoiding uneven cooling of the cooling target, reducing the temperature difference inside the cooling target, and ensuring stable operation of the energy storage system.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] A storage pipeline device for actively reducing temperature difference is connected to a cooling device and used to reduce the temperature of a cooling target, comprising a first tube connected to an output end of the cooling device, a second tube connected to the output end of the cooling device, a third tube and a fourth tube connected to the cooling target, and an active temperature averaging module. The first tube, the second tube, the third tube, the fourth tube and the active temperature averaging module can be constructed into two different circulation paths and switched through the active temperature averaging module.

[0009] The active temperature equalization module enables the two circulation paths to be switched according to actual needs, changing the direction of coolant flow in the cooling target, avoiding uneven cooling of the cooling target, reducing the temperature difference inside the cooling target, and ensuring stable operation of the energy storage system.

[0010] The introduction of the active temperature equalization module enables this energy storage pipeline device to perform well in reducing the temperature difference of the cooling target. By intelligently switching the circulation path and adjusting the flow direction of the coolant, the device can ensure uniform cooling of the cooling target, reduce the internal temperature difference, and provide a strong guarantee for the stable operation of the energy storage system. This innovative design brings users a more reliable and efficient cooling solution.

[0011] The active temperature equalization module is the core component of this energy storage pipeline device. It is exquisitely designed and powerful. The module can intelligently switch between the two circulation paths seamlessly according to actual needs, thereby flexibly adjusting the flow direction of the coolant in the cooling target. This dynamic adjustment capability allows the coolant to enter the cooling target from two different directions and flow out of the cooling target from two different directions, thereby avoiding the phenomenon of uneven cooling, improving cooling efficiency, ensuring the stable operation of the energy storage system, and extending the service life of the equipment.

[0012] Preferably, the two different circulation paths are circulation path one and circulation path two, wherein circulation path one passes through the first tube, the third tube, the cooling target, the fourth tube, the second tube, the cooling equipment in sequence and returns to the first tube, and circulation path two passes through the first tube, the fourth tube, the cooling target, the third tube, the second tube, the cooling equipment in sequence and returns to the first tube.

[0013] Two different circulation paths - circulation path one and circulation path two, are carefully designed to meet different cooling needs. In circulation path one, the coolant flows through the first tube, the third tube, the cooling target, the fourth tube, the second tube in turn, and finally returns to the cooling equipment for re-cooling and circulates back to the first tube again. Circulation path two takes a different path. The coolant starts from the first tube, passes through the fourth tube, the cooling target, the third tube, the second tube, and finally returns to the cooling equipment for circulation. The clever design of these two paths allows the coolant to switch different circulation paths regularly or according to real-time monitoring data, and flow through the cooling target in different directions and paths, thereby achieving a more uniform and efficient cooling effect.

[0014] Preferably, the active temperature equalization module includes two three-way ball valves, namely three-way ball valve one and three-way ball valve two. The three-way ball valve one is connected to the first tube, the third tube and the fourth tube respectively, and the three-way ball valve two is connected to the second tube, the third tube and the fourth tube respectively.

[0015] The active temperature equalization module includes two key three-way ball valves - three-way ball valve 1 and three-way ball valve 2. Three-way ball valve 1 cleverly connects the first pipe, the third pipe and the fourth pipe, while three-way ball valve 2 connects the second pipe, the third pipe and the fourth pipe. The precise control of these two three-way ball valves enables the coolant to switch smoothly between the two circulation paths, ensuring the continuity and stability of the cooling process.

[0016] Preferably, the three-way ball valve is directly connected to the first pipe, indirectly connected to the third pipe through the fifth pipe, and indirectly connected to the fourth pipe through the sixth pipe.

[0017] The subtlety of this design lies in the direct connection between the three-way ball valve and the first pipe, and the indirect connection between the fifth pipe and the third pipe, and the sixth pipe and the fourth pipe. This connection method not only simplifies the pipeline structure, but also improves the flow efficiency of the coolant. When it is necessary to switch the circulation path, the active temperature equalization module can quickly adjust the switch state of the three-way ball valve and change the flow path of the coolant, thereby achieving precise control of the cooling target temperature.

[0018] Preferably, the three-way ball valve 2 is directly connected to the second pipe, indirectly connected to the third pipe through the seventh pipe, and indirectly connected to the fourth pipe through the eighth pipe.

[0019] The direct connection between the three-way ball valve 2 and the second pipe ensures the smooth flow of the coolant. At the same time, the indirect connection between the seventh pipe and the third pipe, and the eighth pipe and the fourth pipe further enhances the flexibility and scalability of the system. This connection method not only simplifies the layout of the pipeline, but also improves the reliability of the system, allowing the coolant to circulate more efficiently, thereby achieving uniform cooling of the cooling target.

[0020] Preferably, the three-way ball valve 1, the three-way ball valve 2, the fifth tube and the sixth tube can be replaced by a two-position four-way valve, and two modes of connecting the first tube to the third tube, connecting the second tube to the fourth tube, and connecting the first tube to the fourth tube, and connecting the second tube to the third tube can be realized through the two states of the two-position four-way valve. In actual application, the three-way ball valve group and the tube group can be replaced by a two-position four-way valve, which can also realize the smooth switching of the coolant between the two circulation paths.

[0021] An energy storage system comprises one or more energy storage pipeline devices for actively reducing temperature difference.

[0022] Applying this energy storage pipeline device that actively reduces the temperature difference in the energy storage system undoubtedly brings significant advantages to the entire system. One or more such devices can work together to maintain the stable operation of the energy storage system. They ensure uniform cooling of the cooling target by precisely controlling the flow direction of the coolant, thereby reducing the internal temperature difference and ensuring the performance and life of the energy storage system. At the same time, the high efficiency, stability, flexibility and easy maintenance of this device also make the operation of the energy storage system more reliable and economical.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The energy storage pipeline device of the utility model that actively reduces the temperature difference has two circulation paths, and the two circulation paths can be switched through an active temperature equalization module, thereby changing the direction of the coolant flow in the cooling target, avoiding the phenomenon of uneven cooling of the cooling target, reducing the temperature difference inside the cooling target, and ensuring the stable operation of the energy storage system. The introduction of the active temperature equalization module makes this energy storage pipeline device perform well in reducing the temperature difference of the cooling target. By intelligently switching the circulation path and adjusting the flow direction of the coolant, the device can ensure uniform cooling of the cooling target, reduce the internal temperature difference, and provide a strong guarantee for the stable operation of the energy storage system. This innovative design brings users a more reliable and efficient cooling solution. The active temperature equalization module is the core component of this energy storage pipeline device, which is exquisitely designed and powerful. The module can intelligently switch seamlessly between the two circulation paths according to actual needs, thereby flexibly adjusting the flow direction of the coolant in the cooling target. This dynamic adjustment capability allows the coolant to enter the cooling target from two different directions and flow out of the cooling target from two different directions, thereby avoiding uneven cooling, improving cooling efficiency, ensuring the stable operation of the energy storage system, and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a structural diagram of an energy storage pipeline device for actively reducing temperature difference according to an embodiment of the utility model.

[0027] Figure 2 This is a state diagram of a circulation path 1 of an embodiment of the present utility model.

[0028] Figure 3 This is a state diagram of the circulation path 2 of an embodiment of the present utility model.

[0029] Figure 4 This is a connection diagram of an energy storage pipeline device for actively reducing temperature difference according to an embodiment of the utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the application product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0034] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0035] The present embodiment provides an energy storage pipeline device for actively reducing temperature difference, which is connected to a cooling device 6 and used to reduce the temperature of a cooling target 7, including a first tube 1 connected to the output end of the cooling device, a second tube 2 connected to the output end of the cooling device, a third tube 3 and a fourth tube 4 communicated with the cooling target, and an active temperature averaging module 5. The first tube 1, the second tube 2, the third tube 3, the fourth tube 4 and the active temperature averaging module 5 can be constructed into two different circulation paths and switched through the active temperature averaging module 5.

[0036] The active temperature equalization module 5 enables the two circulation paths to be switched according to actual needs, changing the flow direction of the coolant in the cooling target, avoiding uneven cooling of the cooling target, reducing the temperature difference inside the cooling target, and ensuring stable operation of the energy storage system.

[0037] The introduction of the active temperature averaging module 5 enables this energy storage pipeline device to perform well in reducing the temperature difference of the cooling target. By intelligently switching the circulation path and adjusting the flow direction of the coolant, the device can ensure uniform cooling of the cooling target, reduce the internal temperature difference, and provide a strong guarantee for the stable operation of the energy storage system. This innovative design brings users a more reliable and efficient cooling solution.

[0038] The active temperature equalization module 5 is the core component of this energy storage pipeline device, which is exquisitely designed and powerful. The module can intelligently switch between the two circulation paths seamlessly according to actual needs, so as to flexibly adjust the flow direction of the coolant in the cooling target. This dynamic adjustment capability allows the coolant to enter the cooling target from two different directions and flow out of the cooling target from two different directions, thereby avoiding the phenomenon of uneven cooling, improving cooling efficiency, ensuring the stable operation of the energy storage system, and extending the service life of the equipment.

[0039] In this embodiment, the two different circulation paths are circulation path 1 and circulation path 2. Circulation path 1 passes through the first tube 1, the third tube 3, the cooling target, the fourth tube 4, the second tube 2, the cooling device and returns to the first tube 1 in sequence. Circulation path 2 passes through the first tube 1, the fourth tube 4, the cooling target, the third tube 3, the second tube 2, the cooling device and returns to the first tube 1 in sequence. In circulation path 1, the coolant enters the cooling target from the third tube 3 and flows out from the fourth tube 4; while in circulation path 2, the coolant enters the cooling target from the fourth tube 4 and flows out from the third tube 3.

[0040] Two different circulation paths, circulation path 1 and circulation path 2, are carefully designed to meet different cooling needs. In circulation path 1, the coolant flows through the first tube 1, the third tube 3, the cooling target, the fourth tube 4, the second tube 2 in sequence, and finally returns to the cooling equipment for re-cooling, and circulates back to the first tube 1 again. Circulation path 2 takes a different path. The coolant starts from the first tube 1, passes through the fourth tube 4, the cooling target, the third tube 3, the second tube 2, and finally returns to the cooling equipment for circulation. The clever design of these two paths allows the coolant to switch different circulation paths regularly or according to real-time monitoring data, and flow through the cooling target in different directions and paths, thereby achieving a more uniform and efficient cooling effect.

[0041] In this embodiment, the active temperature equalizing module 5 includes two three-way ball valves, namely three-way ball valve 1 51 and three-way ball valve 2 52. The three-way ball valve 1 51 is connected to the first tube 1, the third tube 3, and the fourth tube 4 respectively, and the three-way ball valve 2 52 is connected to the second tube 2, the third tube 3, and the fourth tube 4 respectively.

[0042] The active temperature equalization module 5 includes two key three-way ball valves, namely, three-way ball valve 1 51 and three-way ball valve 2 52. The three-way ball valve 1 51 cleverly connects the first tube 1, the third tube 3 and the fourth tube 4, while the three-way ball valve 2 52 connects the second tube 2, the third tube 3 and the fourth tube 4. The precise control of the two three-way ball valves enables the coolant to switch smoothly between the two circulation paths, ensuring the continuity and stability of the cooling process.

[0043] In this embodiment, the three-way ball valve 51 is directly connected to the first pipe 1 , indirectly connected to the third pipe 3 through the fifth pipe 53 , and indirectly connected to the fourth pipe 4 through the sixth pipe 54 .

[0044] The subtlety of this design lies in the direct connection between the three-way ball valve 51 and the first tube 1, and the indirect connection between the fifth tube 53 and the third tube 3, and the sixth tube 54 and the fourth tube 4. This connection method not only simplifies the pipeline structure, but also improves the flow efficiency of the coolant. When it is necessary to switch the circulation path, the active temperature equalization module 5 can quickly adjust the switch state of the three-way ball valve and change the flow path of the coolant, thereby achieving precise control of the cooling target temperature.

[0045] The three-way ball valve 51 has three interfaces, the interface 511 is connected to the first pipe 1, the interface 512 is connected to the fifth pipe 53, and the interface 513 is connected to the sixth pipe 54.

[0046] In this embodiment, the three-way ball valve 2 52 is directly connected to the second pipe 2 , is indirectly connected to the third pipe 3 through the seventh pipe 55 , and is indirectly connected to the fourth pipe 4 through the eighth pipe 56 .

[0047] The direct connection between the three-way ball valve 2 52 and the second pipe 2 ensures the smooth flow of the coolant. At the same time, the indirect connection between the seventh pipe 55 and the third pipe 3, and the eighth pipe 56 and the fourth pipe 4 further enhances the flexibility and scalability of the system. This connection method not only simplifies the layout of the pipeline, but also improves the reliability of the system, allowing the coolant to circulate more efficiently, thereby achieving uniform cooling of the cooling target.

[0048] The three-way ball valve 2 52 has three interfaces, the interface 521 is connected to the second pipe 2 , the interface 522 is connected to the seventh pipe 55 , and the interface 523 is connected to the eighth pipe 56 .

[0049] It is worth mentioning that in other embodiments, three-way ball valve one, three-way ball valve two and the fifth tube and the sixth tube can be replaced by a two-position four-way valve. By switching between the two states of the two-position four-way valve, smooth switching of the coolant between the two circulation paths can also be achieved.

[0050] Specifically, two modes are realized through the two states of the two-position four-way valve: the first pipe is connected to the third pipe, the second pipe is connected to the fourth pipe, and the first pipe is connected to the fourth pipe, and the second pipe is connected to the third pipe.

[0051] Compared with the prior art, the beneficial effects of this embodiment are:

[0052] The energy storage pipeline device that actively reduces the temperature difference has two circulation paths, and the two circulation paths can be switched through the active temperature averaging module, thereby changing the direction of the coolant flow in the cooling target, avoiding the phenomenon of uneven cooling of the cooling target, reducing the temperature difference inside the cooling target, and ensuring the stable operation of the energy storage system. The introduction of the active temperature averaging module makes this energy storage pipeline device perform well in reducing the temperature difference of the cooling target. By intelligently switching the circulation path and adjusting the flow direction of the coolant, the device can ensure uniform cooling of the cooling target, reduce the internal temperature difference, and provide a strong guarantee for the stable operation of the energy storage system. This innovative design brings users a more reliable and efficient cooling solution. The active temperature averaging module is the core component of this energy storage pipeline device, which is exquisitely designed and powerful. The module can intelligently switch seamlessly between the two circulation paths according to actual needs, thereby flexibly adjusting the flow direction of the coolant in the cooling target. This dynamic adjustment capability allows the coolant to enter the cooling target from two different directions and flow out of the cooling target from two different directions, thereby avoiding uneven cooling, improving cooling efficiency, ensuring the stable operation of the energy storage system, and extending the service life of the equipment.

[0053] Advantages and disadvantages of two-position four-way valves compared to three-way ball valve groups and pipe groups.

[0054] 1. Structure and working principle:

[0055] 1. Two-position four-way valve: This is a control valve with four oil ports, commonly used in refrigeration equipment. Its working principle depends on the power-on and power-off status of the electromagnetic coil, thereby controlling the movement of the valve core to achieve the switching of cooling and heating modes.

[0056] 2. Three-way ball valve group and pipe group: usually includes valve body, ball, valve stem and complex pipe connection parts. By rotating the ball, the flow direction of the fluid can be changed to achieve switching or flow adjustment.

[0057] 2. Application scenarios:

[0058] 1. Two-position four-way valve: Mainly used for switching between cooling and heating in air-conditioning systems or hydraulic systems. Due to its unique reversing function, it performs well in systems that require frequent switching between cooling and heating modes or maintains stable performance in frequent hydraulic oil reversing.

[0059] 2. Three-way ball valve group and pipe group: It is more commonly used in situations where it is necessary to simply adjust the flow direction or flow of the fluid, such as petrochemical, pharmaceutical, chemical and other industries. It has a simple structure, low failure rate and simple maintenance.

[0060] 3. Advantages comparison:

[0061] 1. Large flow capacity: The design of the two-position four-way valve makes the fluid encounter greater resistance when flowing inside it, and is limited by the power of the solenoid valve. It is usually used in scenarios with smaller flow rates. In contrast, the three-way ball valve group and pipe group may have a stronger flow capacity due to its simple structure.

[0062] 2. Smooth switching: The two-position four-way valve achieves fast and smooth switching through electromagnetic control, which is particularly important for air-conditioning systems that need to frequently switch between cooling and heating modes or hydraulic systems that need to frequently switch the direction of hydraulic oil. The switching of a three-way ball valve usually needs to be achieved manually or mechanically, and the switching process may not be as smooth as that of a two-position four-way valve.

[0063] 3. Simple control: The two-position four-way valve can be remotely controlled or automatically controlled through electronic control components such as solenoid valves, which makes the operation easier. However, the three-way ball valve usually needs to be manually operated or mechanically controlled, and the control method is relatively simple.

[0064] In general, two-position four-way valves and three-way ball valves each have their own advantages and applicable occasions. Two-position four-way valves perform well in air-conditioning systems that require small flow, fast and smooth switching between cooling and heating modes, or hydraulic systems that require frequent switching of hydraulic oil directions, while three-way ball valves are more suitable for occasions that require simple adjustment of fluid flow direction or flow. When choosing which valve to use, it is necessary to make comprehensive considerations based on specific application requirements and environmental conditions.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy storage pipeline device for actively reducing temperature difference, characterized in that: A device connected to a cooling device and used to reduce the temperature of a cooling target includes a first tube connected to an output end of the cooling device, a second tube connected to an output end of the cooling device, a third tube and a fourth tube connected to the cooling target, and an active temperature averaging module. The first tube, the second tube, the third tube, the fourth tube and the active temperature averaging module can be constructed into two different circulation paths and switched through the active temperature averaging module.

2. The energy storage pipeline device for actively reducing temperature difference according to claim 1, characterized in that: The two different circulation paths are circulation path one and circulation path two. The circulation path one passes through the first tube, the third tube, the cooling target, the fourth tube, the second tube, the cooling equipment and returns to the first tube in sequence. The circulation path two passes through the first tube, the fourth tube, the cooling target, the third tube, the second tube, the cooling equipment and returns to the first tube in sequence.

3. The energy storage pipeline device for actively reducing temperature difference according to claim 2 is characterized in that: The active temperature equalization module includes two three-way ball valves, namely three-way ball valve 1 and three-way ball valve 2. The three-way ball valve 1 is connected to the first pipe, the third pipe, and the fourth pipe respectively, and the three-way ball valve 2 is connected to the second pipe, the third pipe, and the fourth pipe respectively.

4. The energy storage pipeline device for actively reducing temperature difference according to claim 3 is characterized in that: The three-way ball valve is directly connected to the first pipe, indirectly connected to the third pipe through the fifth pipe, and indirectly connected to the fourth pipe through the sixth pipe.

5. The energy storage pipeline device for actively reducing temperature difference according to claim 4, characterized in that: The three-way ball valve 2 is directly connected to the second pipe, indirectly connected to the third pipe through the seventh pipe, and indirectly connected to the fourth pipe through the eighth pipe.

6. The energy storage pipeline device for actively reducing temperature difference according to claim 2, characterized in that: The active temperature equalization module includes a two-position four-way valve.

7. The energy storage pipeline device for actively reducing temperature difference according to claim 6, characterized in that: The two-position four-way valve is connected to the first pipe, the second pipe, the third pipe and the fourth pipe respectively.

8. The energy storage pipeline device for actively reducing temperature difference according to claim 7, characterized in that: The two-position four-way valve has two states, and the two states of the two-position four-way valve correspond to the circulation passage one and the circulation passage two.

9. The energy storage pipeline device for actively reducing temperature difference according to claim 8, characterized in that: The switching between the circulation passage 1 and the circulation passage 2 is achieved by switching between the two states of the two-position four-way valve.

10. An energy storage system, characterized in that: The invention comprises one or more energy storage pipeline devices for actively reducing temperature difference as described in any one of claims 1 to 9.

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