Heat exchange system with double working modes and energy storage system unit

Abstract

The utility model discloses a heat exchange system with double working modes and an energy storage system unit. The heat exchange system comprises a plate heat exchanger, a water cooling loop, a first heat exchange loop, a second heat exchange loop and a three-way reversing valve, the water cooling loop is connected with the plate heat exchanger; the plate heat exchanger is connected with the first heat exchange loop and the second heat exchange loop through the three-way reversing valve; the first heat exchange loop is provided with a first outdoor heat exchanger, the first outdoor heat exchanger is a gravity assisted heat pipe, and the sectional area of the lower portion of the first outdoor heat exchanger is larger than that of the upper portion of the first outdoor heat exchanger. Under the condition of low environment temperature or low load, the three-way reversing valve is switched to the first heat exchange loop, the first outdoor heat exchanger and the plate heat exchanger are used for exchanging heat with the external environment, external force such as high-power equipment such as a compressor is not needed, corresponding heat exchange loops can be adopted under different conditions, noise is reduced, and the heat exchange efficiency is improved. And the system power consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the field of energy storage thermal management, and particularly relates to a heat exchange system with a dual working mode and an energy storage system unit. Background Art

[0002] At present, the requirements for noise in energy storage system units in different application scenarios are getting higher and higher. Especially for some industrial and commercial energy storage placed in places where there are many residents or people gathering, noise control has almost become a rigid index requirement put forward by customers. The main noise source of the energy storage system is the vibration caused by the heat management temperature control equipment during the heat dissipation process, mainly including fans and compressors, etc.

[0003] For existing energy storage thermal management equipment, whether it is air-cooled or water-cooled, the fans for external circulation heat dissipation and the compressors for driving refrigerants are the main noise sources. Inevitably, vibration will occur when these two work at high frequencies. At present, many methods for reducing noise, from the perspective of the fan, are to increase the fan blade area, use a large-air-volume fan, and work at low frequencies to meet the air volume requirements; the solution for the compressor is similar, that is, select a compressor with a rated cooling capacity greater than the required cooling capacity and work at low frequencies to meet the cooling capacity requirements and reduce noise at the same time. The above methods increase the cost and do not fundamentally solve the problem of high noise. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is: how to reduce the noise of the thermal management system and save energy consumption.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is as follows:

[0006] In the first aspect, the utility model provides a heat exchange system with a dual working mode, which includes a plate heat exchanger, a water-cooled circuit, a first heat exchange circuit, a second heat exchange circuit and a three-way reversing valve;

[0007] The water-cooled circuit is connected to the plate heat exchanger;

[0008] The plate heat exchanger is connected to the first heat exchange circuit and the second heat exchange circuit through the three-way reversing valve;

[0009] Wherein, a first outdoor heat exchanger is provided on the first heat exchange circuit. The first outdoor heat exchanger is a gravity heat pipe, and the cross-sectional area of the lower part of the first outdoor heat exchanger is larger than that of the upper part.

[0010] Further, the first heat exchange circuit further includes a first two-way expansion valve;

[0011] The first two-way expansion valve is respectively connected to the first outdoor heat exchanger and the plate heat exchanger.

[0012] Furthermore, the water cooling circuit includes a water pump and an expansion tank;

[0013] The water pump is connected to the expansion tank.

[0014] Furthermore, the plate heat exchanger is filled with refrigerant.

[0015] Furthermore, the second heat exchange circuit includes a compressor and a second outdoor heat exchanger;

[0016] The compressor is connected to the second outdoor heat exchanger.

[0017] Furthermore, the three valve ports of the three-way reversing valve are respectively connected to the inlet of the compressor, one port of the plate heat exchanger, and one port of the first outdoor heat exchanger.

[0018] Furthermore, the second heat exchange circuit further includes a second two-way expansion valve;

[0019] The second two-way expansion valve is respectively connected to the plate heat exchanger and the second outdoor heat exchanger.

[0020] Furthermore, a blower is further included;

[0021] The blower is arranged on one side of the second outdoor heat exchanger.

[0022] Furthermore, refrigerant flows in the first heat exchange circuit and the second heat exchange circuit.

[0023] On the other hand, the present utility model provides an energy storage system unit, including a battery cluster and a heat exchange system, and the heat exchange system is a heat exchange system with a dual working mode as described above;

[0024] The water cooling circuit is connected to the battery cluster.

[0025] The beneficial effects of the present utility model are as follows: Based on the cooling of the water cooling circuit, two heat exchange circuits are designed, corresponding to working modes under different external environments respectively. In the case of high ambient temperature or high load, the second heat exchange circuit is selected for external heat exchange; in the case of low ambient temperature or low load, through the three-way reversing valve, it is switched to the first heat exchange circuit, and heat exchange with the external environment is carried out through the first outdoor heat exchanger and the plate heat exchanger, without the need to rely on external forces such as high-power equipment like compressors. It can adopt the corresponding heat exchange circuit under different conditions, reducing noise and lowering the system power consumption. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the overall structure of a heat exchange system with a dual working mode according to an embodiment of the present utility model;

[0027] Figure 2 Schematic structural diagram of one working mode of a heat exchange system with a dual working mode according to an embodiment of the present utility model;

[0028] Figure 3 Schematic structural diagram of another working mode of a heat exchange system with a dual working mode according to an embodiment of the present utility model;

[0029] Figure 4 Schematic structural diagram of the first outdoor heat exchanger of a heat exchange system with a dual working mode according to an embodiment of the present utility model;

[0030] Label description:

[0031] 1. Compressor; 2. Three-way reversing valve; 3. Second outdoor heat exchanger; 4. Fan;

[0032] 5. Second two-way expansion valve; 6. Plate heat exchanger; 7. First outdoor heat exchanger; 8. Water pump;

[0033] 9. Expansion water tank; 10. First two-way expansion valve; 11. Water cooling circuit; 12. First heat exchange circuit;

[0034] 13. Second heat exchange circuit. Specific implementation manner

[0035] To describe in detail the technical content, achieved purpose and effects of the present utility model, the following is described in conjunction with the implementation manners and with reference to the accompanying drawings.

[0036] Please refer to Figure 1 , a heat exchange system with a dual working mode, including a plate heat exchanger, a water cooling circuit, a first heat exchange circuit, a second heat exchange circuit and a three-way reversing valve;

[0037] The water cooling circuit is connected to the plate heat exchanger;

[0038] The plate heat exchanger is connected to the first heat exchange circuit and the second heat exchange circuit through the three-way reversing valve;

[0039] Wherein, a first outdoor heat exchanger is provided on the first heat exchange circuit, the first outdoor heat exchanger is a gravity heat pipe, and the cross-sectional area of the lower part of the first outdoor heat exchanger is larger than that of the upper part.

[0040] As can be seen from the above description, the beneficial effects of the present utility model are as follows: On the basis of cooling by the water cooling circuit, two heat exchange circuits are designed, corresponding to working modes under different external environments respectively. In the case of high ambient temperature or high load, the second heat exchange circuit is selected for external force heat exchange; in the case of low ambient temperature or low load, through the three-way reversing valve, it is switched to the first heat exchange circuit, and heat exchange is carried out with the external environment through the first outdoor heat exchanger and the plate heat exchanger, without the need to rely on external forces such as large-power equipment like compressors. It can adopt the corresponding heat exchange circuit under different circumstances, reducing noise and lowering the system power consumption.

[0041] Further, the first heat exchange circuit further includes a first two-way expansion valve;

[0042] The first two-way expansion valve is respectively connected to the first outdoor heat exchanger and the plate heat exchanger.

[0043] As can be seen from the above description, when the refrigerant passes through the first two-way expansion valve, due to the resistance, the pressure drops, and at the same time, part of the liquid will vaporize, absorbing heat and correspondingly reducing its own temperature, which is beneficial for the refrigerant to become a low-temperature and low-pressure liquid and flow into the plate heat exchanger.

[0044] Further, the water cooling circuit includes a water pump and an expansion tank;

[0045] The water pump is connected to the expansion tank.

[0046] As can be seen from the above description, after the water pump is started, the water cooling liquid absorbs heat and rises in temperature, passes through the expansion tank, reaches the plate heat exchanger to exchange heat with the refrigerant, and conveys the heat to the refrigerant, thereby reducing the temperature of the water cooling liquid.

[0047] Further, the plate heat exchanger is filled with refrigerant.

[0048] As can be seen from the above description, the refrigerant exchanges heat with the water cooling liquid flowing through the plate heat exchanger, and the refrigerant absorbs the heat of the water cooling liquid and vaporizes into refrigerant vapor.

[0049] Further, the second heat exchange circuit includes a compressor and a second outdoor heat exchanger;

[0050] The compressor is connected to the second outdoor heat exchanger.

[0051] As can be seen from the above description, the compressor turns the low-temperature and low-pressure refrigerant vapor into a high-temperature and high-pressure refrigerant vapor, which runs to the second outdoor heat exchanger for heat exchange to liquefy the refrigerant vapor.

[0052] Further, the three valve ports of the three-way reversing valve are respectively connected to the inlet of the compressor, one port of the plate heat exchanger, and one port of the first outdoor heat exchanger.

[0053] As can be seen from the above description, by means of the three-way reversing valve, it is possible to switch between the first heat exchange circuit and the second heat exchange circuit, and select the appropriate heat exchange circuit according to different usage scenarios, which helps to save power consumption and reduce noise.

[0054] Furthermore, the second heat exchange circuit further includes a second two-way expansion valve;

[0055] The second two-way expansion valve is respectively connected to the plate heat exchanger and the second outdoor heat exchanger.

[0056] As can be seen from the above description, in the second heat exchange circuit, after the refrigerant vapor exchanges heat with the outside world, it forms a high-temperature high-pressure liquid, which flows through the second two-way expansion valve. Through the throttling effect of the second two-way expansion valve, the refrigerant can be turned into a low-temperature and low-pressure liquid and flow back to the plate heat exchanger.

[0057] Furthermore, a blower is further included;

[0058] The blower is arranged on one side of the second outdoor heat exchanger.

[0059] As can be seen from the above description, a blower is added to the second outdoor heat exchanger to perform forced convection heat exchange, accelerating the process of heat exchange and liquefaction of the refrigerant vapor with the outside world.

[0060] Furthermore, a refrigerant flows through the first heat exchange circuit and the second heat exchange circuit.

[0061] As can be seen from the above description, during the heat exchange process, the refrigerant in the heat exchange circuit continuously changes from liquid to gas and then back to liquid, repeating in a cycle, causing the temperature of the water-cooling liquid in the water-cooling circuit to decrease.

[0062] On the other hand, an energy storage system unit is further provided, which includes a battery cluster and a heat exchange system, and the heat exchange system is a heat exchange system with the above-mentioned dual working modes;

[0063] The water-cooling circuit is connected to the battery cluster.

[0064] As can be seen from the above description, the beneficial effects of the present invention are as follows: On the basis of cooling the water-cooling circuit of the battery cluster, two heat exchange circuits are designed, corresponding to different working modes under different external environments. In the case of high ambient temperature or high load, the second heat exchange circuit is selected for external force heat exchange; in the case of low ambient temperature or low load, through the three-way reversing valve, it is switched to the first heat exchange circuit, and heat exchange with the external environment is carried out through the first outdoor heat exchanger and the plate heat exchanger, without the need to rely on external forces such as high-power equipment like compressors. It is possible to adopt the corresponding heat exchange circuit under different circumstances, reducing noise and lowering the system power consumption.

[0065] The above-mentioned heat exchange system with dual working modes of the present invention will be described below through specific embodiments.

[0066] Please refer to Figure 1 、 Figure 2 and Figure 4 , the first embodiment of the present utility model is as follows:

[0067] A heat exchange system with a dual working mode, comprising a plate heat exchanger 6, a water cooling circuit 11, a first heat exchange circuit 12, a second heat exchange circuit 13 and a three-way reversing valve 2; the water cooling circuit 11 is connected to the plate heat exchanger 6; the plate heat exchanger 6 is connected to the first heat exchange circuit 12 and the second heat exchange circuit 13 through the three-way reversing valve 2; a first outdoor heat exchanger 7 is provided on the first heat exchange circuit 12, the first outdoor heat exchanger 7 is a gravity heat pipe, and the cross-sectional area of the lower part of the first outdoor heat exchanger 7 is larger than that of the upper part.

[0068] In this embodiment, the water cooling circuit 11 includes a water pump 8 and an expansion tank 9, and the water pump 8 is connected to the expansion tank 9; the second heat exchange circuit 13 further includes a compressor 1 and a second outdoor heat exchanger 3, and the second outdoor heat exchanger 3 is connected to the compressor 1; the three valve ports of the three-way reversing valve 2 are respectively connected to the inlet of the compressor 1, a port of the plate heat exchanger 6 and a port of the first outdoor heat exchanger 7; the second heat exchange circuit 13 further includes a fan 4, and the fan 4 is arranged on one side of the second outdoor heat exchanger 3.

[0069] In this embodiment, as Figure 2, when the external environmental temperature is higher than 0°C or the load required by the battery cluster is higher than 50% of the rated cooling capacity, through the three-way reversing valve 2, the path connected to the first outdoor heat exchanger 7 is closed, and the path connected to the compressor 1 is opened, and heat exchange is carried out with the cooling liquid in the water-cooled circuit 11 using the second heat exchange circuit 13 to cool down. At this time, the water pump 8 is turned on, and the cooling liquid exchanges heat with the battery cluster through the liquid cooling plate. The temperature of the cooling liquid rises, and through the expansion tank 9, it reaches the plate heat exchanger 6. The heated cooling liquid exchanges heat with the refrigerant through the plate heat exchanger 6, transferring the heat to the refrigerant, thereby reducing the water temperature, and repeating the cycle; in the second heat exchange circuit 13, the compressor 1 starts to refrigerate, compresses the refrigerant vapor evaporated by absorbing the heat of the cooling liquid into high-temperature and high-pressure refrigerant vapor, and runs to the second outdoor heat exchanger 3. At the same time, the fan 4 is turned on for forced convection heat exchange. During the liquefaction process of the refrigerant, heat exchange occurs with the outside world, forming a high-temperature high-pressure refrigerant liquid. It flows through the second two-way expansion valve 5, and under the throttling action of the second two-way expansion valve 5, the refrigerant becomes a low-temperature and low-pressure liquid and flows into the plate heat exchanger 6, and vaporizes during the process of absorbing the heat of the cooling liquid, and then enters the compressor 1 again through the three-way reversing valve 2. At the same time, the second outdoor heat exchanger 3 can be arranged at the position of the outer wall of the overall device, and the heat exchange area of the second outdoor heat exchanger 3 can be maximized, increasing the heat exchange amount, so that the required air volume can be reduced, achieving the purpose of reducing the frequency of the fan 4, reducing noise. After the external heat exchange amount increases, the frequency of the compressor 1 can also be controlled in a lower frequency range, which is beneficial to reducing noise and energy consumption.

[0070] Please refer to Figure 1 and Figure 3 , Embodiment 2 of the present utility model is:

[0071] On the basis of Embodiment 1, this embodiment provides a heat exchange system with a dual working mode. Among them, the first heat exchange circuit 12 further includes a first two-way expansion valve 10, and the first two-way expansion valve 10 is respectively connected to the first outdoor heat exchanger 7 and the plate heat exchanger 6.

[0072] In this embodiment, as Figure 3, when the external environmental temperature is lower than 0°C or the load required by the battery cluster is lower than 50% of the rated cooling capacity, through the three-way reversing valve 2, the path connected to the compressor 1 is closed, and the path connected to the first outdoor heat exchanger 7 is opened. The first heat exchange circuit 12 is used to exchange heat with the water-cooled liquid in the water-cooled circuit 11 for cooling. At this time, the water pump 8 is turned on and exchanges heat with the battery cluster through the liquid-cooled plate. The temperature of the water-cooled liquid rises, passes through the expansion tank 9, and reaches the plate heat exchanger 6. The heated water-cooled liquid exchanges heat with the refrigerant through the plate heat exchanger 6, transferring the heat to the refrigerant, thereby reducing the water temperature, and this process repeats; in the first heat exchange circuit 12, the first outdoor heat exchanger 7 completes the driving process of the refrigerant by gravity. The refrigerant in the pipe absorbs heat and evaporates to form a gas in the plate heat exchanger 6. The gas naturally rises along the first heat exchange circuit 12 to the side of the first outdoor heat exchanger 7. Therefore, the first outdoor heat exchanger 7 is arranged at a high position to facilitate the rise and convergence of the refrigerant vapor. On the side of the first outdoor heat exchanger 7, since this mode operates when the external environmental temperature is low or the battery cluster load is low, the refrigerant pressure is small. In this case, the refrigerant liquefies and releases heat to the external environment to form a liquid, and under the action of gravity, it flows back to the side of the plate heat exchanger 6, and this cycle repeats to achieve heat transfer.

[0073] At the same time, as Figure 4 , the first outdoor heat exchanger 7 is designed to make full use of the chimney effect. The external frame and contour are made similar to a chimney, so that the hot air exchanging heat with the outside rises, forming a temperature difference up and down. The air density will also be different, forming a pressure difference, which drives the flow of indoor and outdoor air and strengthens heat exchange, replacing the original function of the fan. Therefore, in this working mode, the compressor 1 and the fan 4 can be not turned on, and the purpose of refrigeration can still be achieved.

[0074] Please refer to Figures 1 to 4 , the third embodiment of the present invention is:

[0075] On the basis of the first embodiment and the second embodiment, this embodiment provides an energy storage system unit, including a battery cluster and a heat exchange system with a dual working mode in the above embodiments. The water-cooled circuit 11 is connected to the battery cluster, and the battery cluster is connected to the water pump 8 and the expansion tank 9 through pipelines.

[0076] In summary, the heat exchange system with a dual working mode and the energy storage system unit provided by the present invention design two heat exchange circuits on the basis of water-cooled circuit cooling, corresponding to different working modes under different external environments. In the case of high environmental temperature or high load, the second heat exchange circuit is selected for external force heat exchange; in the case of low environmental temperature or low load, through the three-way reversing valve, it is switched to the first heat exchange circuit, and heat exchange is carried out with the external environment through the first outdoor heat exchanger and the plate heat exchanger, without relying on external forces such as large-power equipment like compressors. It can adopt the corresponding heat exchange circuit in different situations, reducing noise and system power consumption.

[0077] The above are only the embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in the relevant technical fields, shall similarly be included within the patent protection scope of the present utility model.

Claims

1. A heat exchange system with dual working modes, characterized in that: It includes a plate heat exchanger, a water cooling circuit, a first heat exchange circuit, a second heat exchange circuit and a three-way reversing valve; The water cooling circuit is connected to the plate heat exchanger; The plate heat exchanger is connected to the first heat exchange circuit and the second heat exchange circuit through the three-way reversing valve; Wherein, a first outdoor heat exchanger is provided on the first heat exchange circuit, the first outdoor heat exchanger is a gravity heat pipe, and the lower cross-sectional area of ​​the first outdoor heat exchanger is larger than the upper cross-sectional area.

2. A dual-working mode heat exchange system according to claim 1, characterized in that: The first heat exchange circuit also includes a first bidirectional expansion valve; The first two-way expansion valve is connected to the first outdoor heat exchanger and the plate heat exchanger respectively.

3. A dual-working mode heat exchange system according to claim 1, characterized in that: The water cooling circuit includes a water pump and an expansion water tank; The water pump is connected to the expansion water tank.

4. A dual-working mode heat exchange system according to claim 1, characterized in that: The plate heat exchanger is filled with refrigerant.

5. A dual-working mode heat exchange system according to claim 1, characterized in that: The second heat exchange circuit includes a compressor and a second outdoor heat exchanger; The compressor is connected to the second outdoor heat exchanger.

6. A dual-working mode heat exchange system according to claim 5, characterized in that: The three valve ports of the three-way reversing valve are respectively connected to the inlet of the compressor, one port of the plate heat exchanger and one port of the first outdoor heat exchanger.

7. A dual-working mode heat exchange system according to claim 5, characterized in that: The second heat exchange circuit also includes a second two-way expansion valve; The second two-way expansion valve is connected to the plate heat exchanger and the second outdoor heat exchanger respectively.

8. A dual-working mode heat exchange system according to claim 7, characterized in that: Also includes fans; The fan is arranged on one side of the second outdoor heat exchanger.

9. A dual-working mode heat exchange system according to claim 1, characterized in that: Refrigerant flows through the first heat exchange circuit and the second heat exchange circuit.

10. An energy storage system unit, characterized in that: It comprises a battery cluster and a heat exchange system, wherein the heat exchange system is a dual-working mode heat exchange system as described in any one of claims 1 to 9; The water cooling circuit is connected to the battery cluster.

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