Heat exchange system of battery swap station and battery swap station

Abstract

The invention discloses a heat exchange system of a battery swap station and the battery swap station. The heat exchange system of the battery swap station comprises a refrigerant loop, a cooling device and a secondary refrigerant loop. The refrigerant loop comprises an inverter compressor, a throttler and at least two heat exchangers; the cooling device is arranged in the refrigerant loop, is arranged between the exhaust end of the inverter compressor and the input end of the throttler, is arranged corresponding to a frequency converter of the inverter compressor, and is used for cooling the frequency converter by using a refrigerant; the secondary refrigerant loop is arranged corresponding to a battery pack of the battery swap station and used for conveying a secondary refrigerant, and the secondary refrigerant of the secondary refrigerant loop exchanges heat with a refrigerant through at least one heat exchanger so as to adjust the temperature of the battery pack. By means of the mode, the temperature of the battery pack of the battery swap station can be effectively adjusted, and the frequency converter of the frequency conversion compressor can be effectively cooled.

Description

Technical Field

[0001] The present application relates to the technical field of energy conversion, and particularly to a heat exchange system and a swapping station of a swapping station. Background Art

[0002] When the heat exchange system of a swapping station is used to adjust the temperature of the battery packs in the battery compartments of the swapping station, the variable frequency compressor of the heat exchange system of the swapping station will operate to compress the refrigerant. Among them, the operation of the frequency converter of the variable frequency compressor will cause the temperature of the frequency converter to rise. If the temperature of the frequency converter is too high, it will lead to abnormal operation of the frequency converter, resulting in the inability of the frequency converter to operate normally and affecting the operation stability and service life of the frequency converter.

[0003] Currently, the frequency converter of the variable frequency compressor is mostly cooled by the ordinary liquid cooling method (water / oil). However, the ordinary liquid cooling method requires additional devices such as water pumps, water tanks, and cooling towers, which undoubtedly increases the volume and cost of the heat exchange system of the swapping station, and the cooling effect of the ordinary liquid cooling method on the frequency converter of the variable frequency compressor is poor. Summary of the Invention

[0004] The present application provides at least a heat exchange system and a swapping station of a swapping station.

[0005] In a first aspect of the present application, a heat exchange system of a swapping station is provided. The heat exchange system of the swapping station includes a refrigerant circuit, a cooling device, and a secondary refrigerant circuit; the refrigerant circuit includes a variable frequency compressor, a throttler, and at least two heat exchangers. Among them, after the refrigerant is compressed into a first gaseous state by the variable frequency compressor and discharged through the exhaust end of the compressor, it is condensed into a first liquid state by one of the heat exchangers, and after the throttler throttles and reduces the pressure of the first liquid refrigerant into a second liquid state, it is evaporated into a second gaseous state by another heat exchanger; the cooling device is arranged in the refrigerant circuit, and is arranged between the exhaust end of the variable frequency compressor and the input end of the throttler, and is corresponding to the frequency converter of the variable frequency compressor. The cooling device is used to cool the frequency converter by using the refrigerant; the secondary refrigerant circuit is corresponding to the battery packs of the swapping station. The secondary refrigerant circuit is used to transport the secondary refrigerant. The secondary refrigerant of the secondary refrigerant circuit exchanges heat with the refrigerant through at least one heat exchanger to adjust the temperature of the battery packs.

[0006] Therefore, the cooling device set through the frequency converter of the variable-frequency compressor can cool down the frequency converter of the variable-frequency compressor, reduce the operating temperature of the frequency converter of the variable-frequency compressor, and reduce the occurrence of abnormal operation of the frequency converter of the variable-frequency compressor due to excessive temperature, ensuring the normal operation of the frequency converter of the variable-frequency compressor and improving the operation stability and service life of the frequency converter of the variable-frequency compressor. Further, when the heat exchange system of the battery swapping station has both a heating mode and a cooling mode at the same time, cooling down the operating temperature of the frequency converter of the variable-frequency compressor through the cooling device can further prevent the frequency converter of the variable-frequency compressor from condensing when switching between the cooling mode and the heating mode. In addition, the cooling device cools down the frequency converter of the variable-frequency compressor by using a refrigerant. On the one hand, the refrigerant in the refrigerant circuit is reused to cool down the frequency converter of the variable-frequency compressor, reducing the volume and cost of the heat exchange system of the battery swapping station. On the other hand, the refrigerant in the refrigerant circuit has a large specific heat capacity and can carry more heat per unit volume, enabling more effective cooling of the frequency converter of the variable-frequency compressor.

[0007] Furthermore, the cooling device is arranged between the exhaust end of the variable-frequency compressor in the refrigerant circuit and the input end of the throttler, ensuring that the refrigerant passing through the cooling device always remains as high-pressure refrigerant, effectively preventing the cooling device from condensing and ensuring the normal operation of the cooling device.

[0008] Furthermore, the coolant of the coolant circuit exchanges heat with the refrigerant of the refrigerant circuit at at least one heat exchanger, enabling effective temperature regulation of the battery pack of the battery swapping station, effectively controlling the charging temperature of the battery pack of the battery swapping station, and thus improving the charging efficiency and service life of the battery pack of the battery swapping station.

[0009] Among them, the refrigerant flowing through the cooling device is the first liquid refrigerant.

[0010] Therefore, by setting the refrigerant flowing through the cooling device as the first liquid refrigerant, it can ensure that the refrigerant passing through the cooling device always remains as high-pressure refrigerant, effectively preventing the cooling device from condensing and ensuring the normal operation of the cooling device, so that the cooling device can cool down the frequency converter of the variable-frequency compressor, reduce the operating temperature of the frequency converter of the variable-frequency compressor, and reduce the occurrence of abnormal operation of the frequency converter of the variable-frequency compressor due to excessive temperature, ensuring the normal operation of the frequency converter of the variable-frequency compressor and improving the operation stability and service life of the frequency converter of the variable-frequency compressor. In addition, it can ensure that the refrigerant passing through the cooling device is in a liquid state, and the heat exchange efficiency of the liquid refrigerant is higher, enabling more efficient cooling of the frequency converter of the variable-frequency compressor.

[0011] Among them, the refrigerant circuit includes a first liquid refrigerant passage, which is arranged between at least two heat exchangers. The first liquid refrigerant passage is provided with a cooling device and a throttle, for passing the first liquid refrigerant and enabling the first liquid refrigerant to sequentially pass through the cooling device and the throttle.

[0012] Therefore, by setting that the first liquid refrigerant passage includes a cooling device, and the refrigerant flowing through the cooling device is the first liquid refrigerant, the cooling device can effectively cool the frequency converter of the variable-frequency compressor by using the first liquid refrigerant; by setting that the first liquid refrigerant passage includes a throttle, the refrigerant in the refrigerant circuit can be throttled and depressurized to adapt to the requirements of the heat exchange system of the power exchange station.

[0013] Among them, the first liquid refrigerant passage is further provided with at least one of the following: a liquid receiver, a dryer filter; the liquid receiver is arranged between the cooling device and the input end of the first liquid refrigerant passage, for storing the first liquid refrigerant and outputting the stored first liquid refrigerant to the throttle through the cooling device; the dryer filter is arranged between the cooling device and the throttle, for filtering the first liquid refrigerant output by the cooling device and outputting it to the throttle.

[0014] Therefore, by arranging the liquid receiver between the cooling device and the input end of the first liquid refrigerant passage, gas-liquid separation can be assisted. On the one hand, it ensures that the refrigerant passing through the cooling device is liquid, and the heat exchange efficiency of the liquid refrigerant is higher, and it can cool the frequency converter of the variable-frequency compressor more efficiently; further, in the case that the heat exchange system of the power exchange station has both a heating mode and a cooling mode, by reducing the operating temperature of the frequency converter of the variable-frequency compressor through the cooling device, it can further prevent the frequency converter of the variable-frequency compressor from condensing when switching between the cooling mode and the heating mode, ensure the normal operation of the frequency converter of the variable-frequency compressor, and improve the operation stability and service life of the frequency converter of the variable-frequency compressor. On the other hand, it ensures that the refrigerant entering the throttle is liquid, and avoids the entry of gaseous refrigerant from causing the flow control of the throttle to fail or the flow control efficiency of the throttle to decrease significantly.

[0015] By setting a dryer filter, the moisture in the first liquid refrigerant can be absorbed and the impurities in the first liquid refrigerant can be filtered, ensuring the purity of the first liquid refrigerant and avoiding adverse effects on the heat exchange system of the power exchange station.

[0016] Among them, the heat exchange system of the battery swapping station has a first heat exchange mode and a second heat exchange mode. At least two heat exchangers include a first heat exchanger and a second heat exchanger. The coolant circuit exchanges heat with the refrigerant circuit through the second heat exchanger. The refrigerant circuit also includes a multi-way valve and a switching component. The exhaust end of the variable-frequency compressor is respectively connected to the first end of the first heat exchanger and the first end of the second heat exchanger through the multi-way valve. The switching component is respectively connected to the second end of the first heat exchanger, the second end of the second heat exchanger, and both ends of the first liquid refrigerant passage; in the first heat exchange mode, the multi-way valve connects the exhaust end of the variable-frequency compressor to the first end of the first heat exchanger, so that the first heat exchanger condenses the first gaseous refrigerant into a first liquid state. The switching component switches the input end of the first liquid refrigerant passage to be connected to the second end of the first heat exchanger, and the output end of the first liquid refrigerant passage to be connected to the second end of the second heat exchanger, so that the first heat exchanger provides the first liquid refrigerant to the throttle, and the second heat exchanger evaporates the second liquid refrigerant output by the throttle into a second gaseous state; in the second heat exchange mode, the multi-way valve connects the exhaust end of the variable-frequency compressor to the first end of the second heat exchanger, so that the second heat exchanger condenses the first gaseous refrigerant into a first liquid state. The switching component switches the input end of the first liquid refrigerant passage to be connected to the second end of the second heat exchanger, and the output end of the first liquid refrigerant passage to be connected to the second end of the first heat exchanger, so that the second heat exchanger provides the first liquid refrigerant to the throttle, and the first heat exchanger evaporates the second liquid refrigerant output by the throttle into a second gaseous state.

[0017] Therefore, by setting the multi-way valve and the switching component, the heat exchange system of the battery swapping station can have a first heat exchange mode and a second heat exchange mode, that is, the heat exchange system of the battery swapping station can have a heating mode and a cooling mode. In addition, by setting the switching component, it is ensured that when the heat exchange system of the battery swapping station switches between the first heat exchange mode and the second heat exchange mode, the refrigerant passing through the cooling device always remains a high-pressure refrigerant, which can effectively prevent the cooling device from condensing and ensure the normal operation of the cooling device.

[0018] Among them, the switching component includes a first one-way valve, a second one-way valve, a third one-way valve, and a fourth one-way valve; the input end of the first one-way valve is connected to the second end of the first heat exchanger, and the output end of the first one-way valve is connected to the input end of the first liquid refrigerant passage; the input end of the second one-way valve is connected to the output end of the first liquid refrigerant passage, and the output end of the second one-way valve is connected to the second end of the second heat exchanger; the input end of the third one-way valve is connected to the second end of the second heat exchanger, and the output end of the third one-way valve is connected to the input end of the first liquid refrigerant passage; the input end of the fourth one-way valve is connected to the output end of the first liquid refrigerant passage, and the output end of the fourth one-way valve is connected to the second end of the first heat exchanger.

[0019] Therefore, when the heat exchange system of the battery swapping station switches between the first heat exchange mode and the second heat exchange mode, the combination of 4 one-way valves ensures that the refrigerant passing through the cooling device always remains high-pressure refrigerant, which can effectively prevent the cooling device from condensing and ensure the normal operation of the cooling device.

[0020] The refrigerant circuit further includes at least one of the following: a gas detection component, a gas-liquid separator; the gas detection component includes an exhaust pressure sensor and an exhaust temperature sensor disposed at the exhaust end of the variable-frequency compressor, and / or, an intake pressure sensor and an intake temperature sensor disposed at the intake end of the variable-frequency compressor, and the refrigerant flow rate output by the throttler is determined based on the data detected by the gas detection component; the gas-liquid separator is disposed at the intake end of the variable-frequency compressor.

[0021] Therefore, since the refrigerant flow rate output by the throttler is determined based on the data detected by the gas detection component, the refrigerant flow rate output by the throttler matches the demand of the evaporator, and there will be no situation of excessive or insufficient liquid supply.

[0022] By disposing a gas-liquid separator at the intake end of the variable-frequency compressor, gaseous and liquid refrigerants can be separated to ensure that only gaseous refrigerant enters the variable-frequency compressor, thereby protecting the variable-frequency compressor from the impact and damage of liquid refrigerant.

[0023] Among them, at least one heat exchanger is a plate heat exchanger; and / or, the cooling medium of at least one heat exchanger is an ethylene glycol aqueous solution; and / or, the throttler is an expansion valve; and / or, the cooling device is a cooling plate; and / or, the variable-frequency compressor is a DC variable-frequency scroll compressor.

[0024] Therefore, on the one hand, the plate heat exchanger has a compact structure, which can reduce the volume of the heat exchange system of the battery swapping station; on the other hand, the plate heat exchanger has high heat exchange efficiency, which can effectively adjust the temperature of the battery pack of the battery swapping station; on the other hand, the plate heat exchanger is easy to maintain.

[0025] On the one hand, in a low-temperature environment, the ethylene glycol aqueous solution can still remain liquid and will not freeze like pure water at 0°C, thus ensuring the normal circulation of the cooling medium of the heat exchanger in a low-temperature environment, preventing failures due to the freezing of the cooling medium, thereby ensuring the normal circulation of the heat exchange system of the battery swapping station in a low-temperature environment, and further ensuring that the heat exchange system of the battery swapping station effectively heats the battery pack of the battery swapping station in a low-temperature environment, avoiding the freezing of the battery pack of the battery swapping station in a low-temperature environment. On the other hand, the ethylene glycol aqueous solution has good thermal conductivity and can effectively absorb heat from the heat exchanger to heat the battery pack of the battery swapping station, preventing the battery pack of the battery swapping station from freezing due to being in a low-temperature environment.

[0026] On the one hand, the expansion valve throttles the first liquid refrigerant into the second liquid refrigerant, creating conditions for the evaporator to absorb heat. On the other hand, the expansion valve dynamically adjusts the opening degree according to the load of the refrigerant heat exchange system to match the requirements of the evaporator and avoid overfeeding or underfeeding of the liquid refrigerant.

[0027] The cooling plate has a large surface area and can more efficiently cool the frequency converter of the variable frequency compressor.

[0028] On the one hand, the DC variable frequency scroll compressor can effectively control the operating frequency of the compressor by changing the power frequency through the integrated frequency converter, so that it can adjust the refrigeration or heating function according to the actual load demand, improve the energy utilization rate, and achieve energy conservation and emission reduction. On the other hand, the DC variable frequency scroll compressor has the advantages of high efficiency, stability, and low noise.

[0029] Among them, the heat exchanger where the secondary refrigerant circuit exchanges heat with the refrigerant circuit includes a secondary refrigerant input end and a secondary refrigerant output end; the secondary refrigerant circuit includes a liquid inlet pipeline, a liquid outlet pipeline, and a battery pipeline corresponding to the battery pack. The input end of the liquid inlet pipeline is communicated with the secondary refrigerant output end, the output end of the liquid inlet pipeline is communicated with the input end of the battery pipeline, the input end of the liquid outlet pipeline is communicated with the output end of the battery pipeline, and the output end of the liquid outlet pipeline is communicated with the secondary refrigerant input end.

[0030] Therefore, the input end of the liquid inlet pipeline is communicated with the secondary refrigerant output end, and the output end of the liquid inlet pipeline is communicated with the input end of the battery pipeline. Therefore, after the secondary refrigerant exchanges heat with the refrigerant in the refrigerant circuit 10 through the heat exchanger, it can be transported to the battery pipeline corresponding to the battery pack; the secondary refrigerant exchanges heat with the battery pack through the battery pipeline to adjust the temperature of the battery pack. The input end of the liquid outlet pipeline is communicated with the output end of the battery pipeline. Therefore, the secondary refrigerant after exchanging heat with the battery pack can be transported out of the battery pipeline, ensuring that the secondary refrigerant after exchanging heat with the refrigerant in the refrigerant circuit can be continuously transported to the battery pipeline to stably adjust the temperature of the battery pack. The output end of the liquid outlet pipeline is communicated with the secondary refrigerant input end. Therefore, the secondary refrigerant after exchanging heat with the battery pack can be re-transported to the heat exchanger to re-exchange heat with the refrigerant in the refrigerant circuit through the heat exchanger.

[0031] Among them, a plurality of control valves are provided on the liquid inlet pipeline, and each control valve is respectively used to control the flow rate of the secondary refrigerant in the battery pipeline corresponding to at least one battery pack.

[0032] Therefore, by setting the control valves, the flow rate of the secondary refrigerant in the battery pipeline corresponding to each battery pack can be accurately controlled, so that the appropriate cooling or preheating effect can be ensured for each battery pack, and the accurate control of the temperature of the battery pack can be achieved.

[0033] Among them, the liquid inlet pipeline includes a drain valve, a liquid inlet filter, and a butterfly valve connected in sequence according to the flow direction of the secondary refrigerant; the liquid outlet pipeline includes a secondary refrigerant driving assembly, and the secondary refrigerant driving assembly is used to drive the secondary refrigerant to flow in the secondary refrigerant circuit.

[0034] Therefore, the components included in the liquid inlet pipeline and the liquid outlet pipeline can be flexibly set.

[0035] The second aspect of the present application provides a battery swapping station, which includes a battery pack and the above heat exchange system, and the heat exchange system is used to adjust the temperature of the battery pack.

[0036] In the above technical solution, through the cooling device provided for the frequency converter of the variable frequency compressor, the temperature of the frequency converter of the variable frequency compressor can be reduced, the operating temperature of the frequency converter of the variable frequency compressor can be lowered, and the situation that the frequency converter of the variable frequency compressor runs abnormally due to excessive temperature can be reduced, ensuring the normal operation of the frequency converter of the variable frequency compressor, improving the operating stability and service life of the frequency converter of the variable frequency compressor; further, when the heat exchange system of the battery swapping station has both a heating mode and a cooling mode at the same time, by reducing the operating temperature of the frequency converter of the variable frequency compressor through the cooling device, the condensation phenomenon of the frequency converter of the variable frequency compressor during the switching between the cooling mode and the heating mode can be further prevented.

[0037] In addition, the cooling device uses the refrigerant to cool down the frequency converter of the variable frequency compressor. On the one hand, the refrigerant in the refrigerant circuit is reused to cool down the frequency converter of the variable frequency compressor, reducing the volume and cost of the heat exchange system of the battery swapping station; on the other hand, the refrigerant in the refrigerant circuit has a large specific heat capacity, and more heat can be carried per unit volume, which can more effectively cool down the frequency converter of the variable frequency compressor.

[0038] Furthermore, the cooling device is arranged between the exhaust end of the variable frequency compressor and the input end of the throttle in the refrigerant circuit, ensuring that the refrigerant passing through the cooling device always remains as high-pressure refrigerant, which can effectively prevent the cooling device from condensing and ensure the normal operation of the cooling device.

[0039] Furthermore, the secondary refrigerant in the secondary refrigerant circuit exchanges heat with the refrigerant in the refrigerant circuit at at least one heat exchanger, which can effectively adjust the temperature of the battery pack of the battery swapping station, effectively control the charging temperature of the battery pack of the battery swapping station, and thus improve the charging efficiency and service life of the battery pack of the battery swapping station. Description of the Drawings

[0040] Figure 1 is a schematic structural diagram of an embodiment of the heat exchange system of the battery swapping station provided by the present application; Figure 2 is a schematic diagram of the refrigerant flow direction of the heat exchange system provided by the present application in the first heat exchange mode; Figure 3It is a schematic diagram of the refrigerant flow direction in the heat exchange system provided by this application in the second heat exchange mode; Figure 4 It is a schematic structural diagram of another embodiment of the refrigerant circuit provided by this application; Figure 5 It is a schematic structural diagram of an embodiment of the secondary refrigerant circuit provided by this application; Figure 6 It is a schematic structural diagram of an embodiment of the swapping station provided by this application. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of this application will be clearly and completely described with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0042] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of this application, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if descriptions such as "first" and "second" are involved in the embodiments of this application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by this application.

[0044] To better understand this application, the refrigerant heat exchange system and battery device provided by this application will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0045] Please refer to the attached Figure 1 , Figure 1 It is a schematic structural diagram of an embodiment of the heat exchange system of the swapping station provided by this application. This application provides a heat exchange system 100 for a swapping station. The heat exchange system 100 for the swapping station includes a refrigerant circuit 10, a cooling device 20, and a secondary refrigerant circuit 30.

[0046] The refrigerant circuit 10 includes a variable-frequency compressor 11, a throttle 12, and at least two heat exchangers 13. Among them, after the refrigerant is compressed into a first gaseous state by the variable-frequency compressor 11 and discharged through the exhaust end 111 of the variable-frequency compressor 11, it is condensed into a first liquid state by one of the heat exchangers 13. After the throttle 12 throttles and reduces the pressure of the refrigerant in the first liquid state to a second liquid state, it is evaporated into a second gaseous state by the other heat exchanger 13. Among them, the number of the heat exchangers 13 is not limited. For example, as Figure 1 shown, there are two heat exchangers 13.

[0047] Specifically, the refrigerant in the second gaseous state (low-temperature and low-pressure gaseous refrigerant) enters the variable-frequency compressor 11 through the suction end 112 of the variable-frequency compressor 11. The variable-frequency compressor 11 compresses the refrigerant in the second gaseous state. After being compressed by the variable-frequency compressor 11, the pressure and temperature of the refrigerant increase, and a first gaseous refrigerant (high-temperature and high-pressure gaseous refrigerant) is obtained; after the first gaseous refrigerant is discharged through the exhaust end 111 of the variable-frequency compressor 11, it enters a heat exchanger 13. This heat exchanger 13 condenses the first gaseous refrigerant, and the refrigerant is condensed into a first liquid refrigerant (medium-temperature and high-pressure liquid refrigerant). The state of the first liquid refrigerant is a medium-temperature and high-pressure subcooled liquid; the first liquid refrigerant enters the throttle 12. The throttle 12 throttles and reduces the pressure of the first liquid refrigerant. After being throttled and depressurized by the throttle 12, the pressure and temperature of the refrigerant drop sharply, and a second liquid refrigerant (low-temperature and low-pressure liquid refrigerant) is obtained; the second liquid refrigerant enters the other heat exchanger 13. This heat exchanger 13 evaporates the second liquid refrigerant, and the refrigerant is evaporated into a second gaseous refrigerant (low-temperature and low-pressure gaseous refrigerant). The second gaseous refrigerant enters the variable-frequency compressor 11 again through the suction end 112 of the variable-frequency compressor 11 for the next cycle.

[0048] The secondary refrigerant circuit 30 is arranged corresponding to the battery pack 200 of the battery swapping station. The secondary refrigerant circuit 30 is used to transport the secondary refrigerant. The secondary refrigerant of the secondary refrigerant circuit 30 exchanges heat with the refrigerant through at least one heat exchanger 13 to adjust the temperature of the battery pack 200. The secondary refrigerant of the secondary refrigerant circuit 30 exchanges heat with the refrigerant of the refrigerant circuit 10 through at least one heat exchanger 13, which can effectively adjust the temperature of the battery pack 200 of the battery swapping station, effectively control the charging temperature of the battery pack 200 of the battery swapping station, and thus improve the charging efficiency and service life of the battery pack 200 of the battery swapping station. Among them, the battery swapping station can be a heavy truck battery swapping station, etc., which is not limited here. It should be noted that at least one heat exchanger 13 for the secondary refrigerant of the secondary refrigerant circuit 30 to exchange heat with the refrigerant of the refrigerant circuit 10 belongs to both the secondary refrigerant circuit 30 and the refrigerant circuit 10, that is, the secondary refrigerant circuit 30 and the refrigerant circuit 10 share at least one heat exchanger 13 for the secondary refrigerant to exchange heat with the refrigerant.

[0049] As Figure 1 shown, when the heat exchange system 100 of the battery swapping station is only used to increase the temperature of the battery pack 200 of the battery swapping station, that is, when the heat exchange system 100 of the battery swapping station only has a heating mode, the coolant in the coolant circuit 30 exchanges heat with the refrigerant in the refrigerant circuit 10 through the heat exchanger 13 that condenses the first gaseous refrigerant. Through this heat exchanger 13, the coolant absorbs heat and increases in temperature, and the first gaseous refrigerant releases heat and condenses into the first liquid refrigerant; since the coolant circuit 30 is arranged corresponding to the battery pack 200 of the battery swapping station, the coolant in the coolant circuit 30 that has absorbed heat and increased in temperature can preheat the battery pack 200 of the battery swapping station. Another heat exchanger 13 is used to exchange heat with the external environment, and the second liquid refrigerant in this heat exchanger 13 exchanges heat with the external environment, absorbing heat to evaporate the second liquid refrigerant into the second gaseous refrigerant.

[0050] As Figure 1 shown, when the heat exchange system 100 of the battery swapping station is only used to decrease the temperature of the battery pack 200 of the battery swapping station, that is, when the heat exchange system 100 of the battery swapping station only has a cooling mode, the coolant in the coolant circuit 30 exchanges heat with the refrigerant in the refrigerant circuit 10 through the heat exchanger 13 that evaporates the second liquid refrigerant. Through this heat exchanger 13, the coolant releases heat and decreases in temperature, and the second liquid refrigerant absorbs heat and evaporates into the second gaseous refrigerant; since the coolant circuit 30 is arranged corresponding to the battery pack 200 of the battery swapping station, the coolant in the coolant circuit 30 that has released heat and decreased in temperature can cool the battery pack 200 of the battery swapping station. Another heat exchanger 13 is used to exchange heat with the external environment, and the first gaseous refrigerant in this heat exchanger 13 exchanges heat with the external environment, releasing heat to condense the first gaseous refrigerant into the first liquid refrigerant.

[0051] As Figure 2 、 Figure 3 shown, Figure 2 is a schematic diagram of the refrigerant flow direction of the heat exchange system provided by the present application in the first heat exchange mode. Figure 3It is a schematic diagram of the refrigerant flow direction in the second heat exchange mode of the heat exchange system provided by this application. When the heat exchange system 100 of the battery swapping station can be used to increase the temperature of the battery pack 200 of the battery swapping station and at the same time can be used to decrease the temperature of the battery pack 200 of the battery swapping station, that is, when the heat exchange system 100 of the battery swapping station has a first heat exchange mode (i.e., refrigeration mode) and a second heat exchange mode (i.e., heating mode), at least two heat exchangers 13 include a first heat exchanger 131 and a second heat exchanger 132. The refrigerant circuit 10 further includes a multi-way valve 14 and a switching component 15. The exhaust end 111 of the variable-frequency compressor 11 is respectively connected to the first end 1311 of the first heat exchanger 131 and the first end 1321 of the second heat exchanger 132 through the multi-way valve 14. The switching component 15 is respectively connected to the second end 1312 of the first heat exchanger 131, the second end 1322 of the second heat exchanger 132, and both ends of the first liquid refrigerant passage 16. The refrigerant of the coolant circuit 30 exchanges heat with the refrigerant through the second heat exchanger 132.

[0052] Figure 2 The arrow direction shown is the refrigerant flow direction in the first heat exchange mode. Figure 3 The arrow direction shown is the refrigerant flow direction in the second heat exchange mode. Figure 2 The refrigerant flow direction shown and Figure 3 The refrigerant flow direction shown are applied in the same refrigerant circuit 10. That is to say, Figure 2 The refrigerant circuit 10 shown and Figure 3 The refrigerant circuit 10 shown are the same refrigerant circuit 10. As Figure 2 shown, in the first heat exchange mode, the multi-way valve 14 connects the exhaust end 111 of the variable-frequency compressor 11 to the first end 1311 of the first heat exchanger 131, so that the first heat exchanger 131 condenses the first gaseous refrigerant into the first liquid state. The switching component 15 switches the input end 161 of the first liquid refrigerant passage 16 to be connected to the second end 1312 of the first heat exchanger 131, and the output end 162 of the first liquid refrigerant passage 16 is connected to the second end 1322 of the second heat exchanger 132, so that the first heat exchanger 131 provides the first liquid refrigerant to the throttler 12, and the second heat exchanger 132 evaporates the second liquid refrigerant output by the throttler 12 into the second gaseous state. As Figure 3As shown, in the second heat exchange mode, the multi-way valve 14 connects the exhaust end 111 of the variable frequency compressor 11 to the first end 1321 of the second heat exchanger 132, so that the second heat exchanger 132 condenses the first gaseous refrigerant into a first liquid state. The switching assembly 15 switches the input end 161 of the first liquid refrigerant passage 16 to be connected to the second end 1322 of the second heat exchanger 132, and switches the output end 162 of the first liquid refrigerant passage 16 to be connected to the second end 1312 of the first heat exchanger 131, so that the second heat exchanger 132 supplies the first liquid refrigerant to the throttle 12, and the first heat exchanger 131 evaporates the second liquid refrigerant output by the throttle 12 into a second gaseous state.

[0053] For example, in the case where it is necessary to cool the battery pack 200 in the battery compartment of the battery swapping station, the multi-way valve 14 connects the exhaust end 111 of the variable frequency compressor 11 to the first end 1311 of the first heat exchanger 131. The first gaseous refrigerant discharged from the exhaust end 111 of the variable frequency compressor 11 enters the first heat exchanger 131. The first gaseous refrigerant exchanges heat with the external environment in the first heat exchanger 131, releasing heat to condense the first gaseous refrigerant into the first liquid refrigerant. The switching assembly 15 switches the input end 161 of the first liquid refrigerant passage 16 to be connected to the second end 1312 of the first heat exchanger 131, and the output end 162 of the first liquid refrigerant passage 16 to be connected to the second end 1322 of the second heat exchanger 132, so as to supply the first liquid refrigerant from the first heat exchanger 131 to the throttling device 12. The throttling device 12 throttles and reduces the pressure of the first liquid refrigerant to obtain the second liquid refrigerant. The second liquid refrigerant output by the throttling device 12 enters the second heat exchanger 132. The second liquid refrigerant exchanges heat with the coolant in the coolant circuit 30 through the second heat exchanger 132. Through this second heat exchanger 132, the coolant releases heat and cools down, and the second liquid refrigerant absorbs heat and evaporates into the second gaseous refrigerant. Since the coolant circuit 30 is provided corresponding to the battery pack 200 of the battery swapping station, the coolant in the coolant circuit 30 that has released heat and cooled down can cool the battery pack 200 of the battery swapping station. In the case where it is necessary to preheat the battery pack 200 in the battery compartment of the battery swapping station, the multi-way valve 14 connects the exhaust end 111 of the variable frequency compressor 11 to the first end 1321 of the second heat exchanger 132. The first gaseous refrigerant discharged from the exhaust end 111 of the variable frequency compressor 11 enters the second heat exchanger 132. The first gaseous refrigerant exchanges heat with the coolant in the coolant circuit 30 through the second heat exchanger 132. Through this second heat exchanger 132, the coolant absorbs heat and warms up, and the first gaseous refrigerant releases heat and condenses into the first liquid refrigerant. Since the coolant circuit 30 is provided corresponding to the battery pack 200 of the battery swapping station, the coolant in the coolant circuit 30 that has absorbed heat and warmed up can preheat the battery pack 200 of the battery swapping station. The switching assembly 15 switches the input end 161 of the first liquid refrigerant passage 16 to be connected to the second end 1322 of the second heat exchanger 132, and the output end of the first liquid refrigerant passage to be connected to the second end 1312 of the first heat exchanger 131, so as to supply the first liquid refrigerant from the second heat exchanger 132 to the throttling device 12. The throttling device 12 throttles and reduces the pressure of the first liquid refrigerant to obtain the second liquid refrigerant. The second liquid refrigerant output by the throttling device 12 enters the first heat exchanger 131. The second liquid refrigerant exchanges heat with the external environment in the first heat exchanger 131, absorbing heat to evaporate the second liquid refrigerant into the second gaseous refrigerant.Therefore, the heat exchange system 100 of the battery swapping station can cool and preheat the battery packs 200 in the battery compartments of the battery swapping station, effectively control the charging temperature of the battery packs 200 in the battery compartments of the battery swapping station, thereby improving the charging efficiency and service life of the battery packs 200 in the battery compartments of the battery swapping station.

[0054] The cooling device 20 is arranged in the refrigerant circuit 10, and is arranged between the exhaust end 111 of the variable frequency compressor 11 and the input end 121 of the throttle 12, and is arranged corresponding to the frequency converter of the variable frequency compressor 11 (not shown in the figure). The cooling device 20 is used to cool the frequency converter of the variable frequency compressor 11 by using the refrigerant. Through the cooling device 20 arranged corresponding to the frequency converter of the variable frequency compressor 11, the frequency converter of the variable frequency compressor 11 can be cooled, the working temperature of the frequency converter of the variable frequency compressor 11 can be reduced, and the situation that the frequency converter of the variable frequency compressor 11 runs abnormally due to too high temperature can be reduced, ensuring the normal operation of the frequency converter of the variable frequency compressor 11, and improving the operation stability and service life of the frequency converter of the variable frequency compressor 11; further, when the heat exchange system 100 of the battery swapping station has both a heating mode and a cooling mode at the same time, by reducing the working temperature of the frequency converter of the variable frequency compressor 11 through the cooling device 20, the condensation phenomenon of the frequency converter of the variable frequency compressor 11 during the switching between the cooling mode and the heating mode can be further prevented. In addition, the cooling device 20 cools the frequency converter of the variable frequency compressor 11 by using the refrigerant. On the one hand, the refrigerant in the refrigerant circuit 10 is reused to cool the frequency converter of the variable frequency compressor 11. Compared with the ordinary liquid cooling method (water / oil), additional equipment such as water pumps, water tanks, and cooling towers is omitted, reducing the volume and cost of the heat exchange system 100 of the battery swapping station; on the other hand, the specific heat capacity of the refrigerant in the refrigerant circuit 10 is large, and more heat can be carried per unit volume, and the heat exchange efficiency is much higher than that of air cooling and ordinary liquid cooling (water / oil), and the frequency converter of the variable frequency compressor 11 can be cooled more effectively. Moreover, the cooling device 20 is arranged between the exhaust end 111 of the variable frequency compressor 11 and the input end 121 of the throttle 12 in the refrigerant circuit 10, ensuring that the refrigerant passing through the cooling device 20 always remains as high-pressure refrigerant (such as high-temperature and high-pressure gaseous refrigerant, medium-temperature and high-pressure liquid refrigerant), which can effectively prevent the cooling device 20 from condensing and ensure the normal operation of the cooling device 20 (it should be noted that when the refrigerant passing through the cooling device 20 is low-temperature and low-pressure refrigerant, the surface temperature of the cooling device 20 will be lower than the dew point temperature of the ambient air, and then the water vapor in the air will condense on the surface of the cooling device 20 when it contacts the surface of the cooling device 20).

[0055] In one embodiment, the refrigerant flowing through the cooling device 20 is the first liquid refrigerant. As Figure 1 shown, since the first gaseous refrigerant is discharged from the exhaust end 111 of the variable frequency compressor 11, and then passes through Figure 1The heat exchanger 13 on the left condenses the refrigerant into the first liquid state. Therefore, it shows that the cooling device 20 is arranged Figure 1 after the output end of the heat exchanger 13 on the left; Since the first liquid refrigerant becomes the second liquid refrigerant after being throttled and depressurized by the throttle 12, it shows that the cooling device 20 is arranged before the throttle 12. Therefore, the cooling device 20 is arranged Figure 1 between the heat exchanger 13 on the left and the throttle 12.

[0056] By arranging the cooling device 20 Figure 1 between the heat exchanger 13 on the left and the throttle 12, it can ensure that the refrigerant passing through the cooling device 20 always remains a high-pressure refrigerant, effectively preventing the cooling device 20 from condensing, ensuring the normal operation of the cooling device 20, so that the cooling device 20 can cool the frequency converter of the variable-frequency compressor 11, reduce the working temperature of the frequency converter of the variable-frequency compressor 11, and reduce the abnormal operation of the frequency converter of the variable-frequency compressor 11 caused by overheating, ensuring the normal operation of the frequency converter of the variable-frequency compressor 11, and improving the operation stability and service life of the frequency converter of the variable-frequency compressor 11. In addition, by arranging the cooling device 20 Figure 1 between the heat exchanger 13 on the left and the throttle 12, it can ensure that the refrigerant passing through the cooling device 20 is in a liquid state, and the heat exchange efficiency of the liquid refrigerant is higher, and it can cool the frequency converter of the variable-frequency compressor 11 more efficiently.

[0057] In a specific embodiment, as Figure 4 shown, Figure 4 is a schematic structural diagram of another embodiment of the refrigerant circuit provided by the present application. The refrigerant circuit 10 includes a first liquid refrigerant passage 16, the first liquid refrigerant passage 16 is arranged between at least two heat exchangers 13, the first liquid refrigerant passage 16 is provided with a cooling device 20 and a throttle 12 for passing the first liquid refrigerant and enabling the first liquid refrigerant to sequentially pass through the cooling device 20 and the throttle 12. The first liquid refrigerant passage 16 further includes a liquid storage device 17, the liquid storage device 17 is arranged between the cooling device 20 and the input end 161 of the first liquid refrigerant passage 16 for storing the first liquid refrigerant and outputting the stored first liquid refrigerant to the throttle 12 through the cooling device 20.

[0058] In the heat exchange system 100 of the battery swapping station, for the heat exchanger 13 that condenses the first gaseous refrigerant into the first liquid refrigerant, the refrigerant at its outlet should be subcooled liquid refrigerant. However, under actual working conditions (such as insufficient heat dissipation of the heat exchanger 13, excessive refrigerant charging, too high condensation pressure of the heat exchanger 13, etc.), it may cause insufficient condensation of the first gaseous refrigerant by the heat exchanger 13, and the refrigerant at the outlet of the heat exchanger 13 contains gaseous components. Therefore, by arranging the liquid receiver 17 between the cooling device 20 and the input end 161 of the first liquid refrigerant passage 16, it can assist in gas-liquid separation. On the one hand, it ensures that the refrigerant passing through the cooling device 20 is in liquid state, and the heat exchange efficiency of the liquid refrigerant is higher, which can cool the frequency converter of the variable frequency compressor 11 more efficiently. Further, when the heat exchange system 100 of the battery swapping station has both a heating mode and a cooling mode, by reducing the working temperature of the frequency converter of the variable frequency compressor 11 through the cooling device 20, it can further prevent the frequency converter of the variable frequency compressor 11 from experiencing condensation phenomenon during the switching between the cooling mode and the heating mode, ensure the normal operation of the frequency converter of the variable frequency compressor 11, and improve the operation stability and service life of the frequency converter of the variable frequency compressor 11. On the other hand, it ensures that the refrigerant entering the throttle 12 is in liquid state, and avoids the entry of gaseous refrigerant from causing the flow control of the throttle 12 to fail or the flow control efficiency of the throttle 12 to decrease significantly.

[0059] Among them, the design pressure and design temperature of the liquid receiver 17 are not limited; for example, the design pressure of the liquid receiver 17 is 4.5 MPa and the design temperature is 150 °C.

[0060] In a specific embodiment, as Figure 4 shown, the refrigerant circuit 10 includes a first liquid refrigerant passage 16. The first liquid refrigerant passage 16 is arranged between at least two heat exchangers 13. The first liquid refrigerant passage 16 is provided with a cooling device 20 and a throttle 12 for passing the first liquid refrigerant and enabling the first liquid refrigerant to pass through the cooling device 20 and the throttle 12 in sequence. The first liquid refrigerant passage 16 further includes a dryer filter 18. The dryer filter 18 is arranged between the cooling device 20 and the throttle 12 for filtering the first liquid refrigerant output by the cooling device 20 and outputting it to the throttle 12.

[0061] If the first liquid refrigerant contains moisture, when passing through the throttle 12, due to the pressure drop, the moisture may freeze, resulting in ice blockage of the throttle 12. Therefore, by setting the dryer filter 18, the moisture in the first liquid refrigerant can be effectively removed, avoiding ice blockage of the throttle 12 caused by the moisture in the first liquid refrigerant. If the first liquid refrigerant contains impurities (such as dust, metal chips, oil stains, etc.), when passing through the throttle 12, it will cause blockage of the throttle 12, hindering the circulation of the refrigerant. Therefore, by setting the dryer filter 18, the impurities in the first liquid refrigerant can be intercepted and filtered, avoiding blockage of the throttle 12 caused by the impurities in the first liquid refrigerant and hindering the circulation of the refrigerant. Therefore, by setting the dryer filter 18, the moisture in the first liquid refrigerant can be absorbed and the impurities in the first liquid refrigerant can be filtered, ensuring the purity of the first liquid refrigerant and avoiding adverse effects on the heat exchange system 100 of the battery swapping station.

[0062] Among them, the design pressure and design temperature of the dryer filter 18 are not limited. For example, the design pressure of the dryer filter 18 is 4.5 MPa and the design temperature is 150 °C.

[0063] In a specific embodiment, as Figure 4 shown, the first liquid refrigerant passage 16 is further provided with a liquid storage device 17 and a dryer filter 18. The liquid storage device 17 is arranged between the cooling device 20 and the input end 161 of the first liquid refrigerant passage 16, and the dryer filter 18 is arranged between the cooling device 20 and the throttle 12.

[0064] In a specific embodiment, as Figure 2 and Figure 3 shown, the refrigerant circuit 10 includes a first liquid refrigerant passage 16. The first liquid refrigerant passage 16 is arranged between at least two heat exchangers 13. The first liquid refrigerant passage 16 is provided with a cooling device 20 and a throttle 12 for passing the first liquid refrigerant and enabling the first liquid refrigerant to pass through the cooling device 20 and the throttle 12 in sequence. The refrigerant heat exchange system 100 has a first heat exchange mode and a second heat exchange mode. At least two heat exchangers 13 include a first heat exchanger 131 and a second heat exchanger 132. The coolant circuit 30 exchanges heat with the refrigerant circuit 10 through the second heat exchanger 132. The refrigerant circuit 10 further includes a multi-way valve 14 and a switching component 15. The exhaust end 111 of the variable frequency compressor 11 is respectively connected to the first end 1311 of the first heat exchanger 131 and the first end 1321 of the second heat exchanger 132 through the multi-way valve 14. The switching component 15 is respectively connected to the second end 1312 of the first heat exchanger 131, the second end 1322 of the second heat exchanger 132, and both ends of the first liquid refrigerant passage 16. As Figure 2As shown, in the first heat exchange mode, the multi-way valve 14 connects the exhaust end 111 of the variable-frequency compressor 11 to the first end 1311 of the first heat exchanger 131, so that the first heat exchanger 131 condenses the first gaseous refrigerant into the first liquid state. The switching assembly 15 switches the input end 161 of the first liquid refrigerant passage 16 to be connected to the second end 1312 of the first heat exchanger 131, and switches the output end 162 of the first liquid refrigerant passage 16 to be connected to the second end 1322 of the second heat exchanger 132, so that the first heat exchanger 131 provides the first liquid refrigerant to the throttle 12, and the second heat exchanger 132 evaporates the second liquid refrigerant output by the throttle 12 into the second gaseous state; as Figure 3 As shown, in the second heat exchange mode, the multi-way valve 14 connects the exhaust end 111 of the variable-frequency compressor 11 to the first end 1321 of the second heat exchanger 132, so that the second heat exchanger 132 condenses the first gaseous refrigerant into the first liquid state. The switching assembly 15 switches the input end 161 of the first liquid refrigerant passage 16 to be connected to the second end 1322 of the second heat exchanger 132, and switches the output end 162 of the first liquid refrigerant passage 16 to be connected to the second end 1312 of the first heat exchanger 131, so that the second heat exchanger 132 provides the first liquid refrigerant to the throttle 12, and the first heat exchanger 131 evaporates the second liquid refrigerant output by the throttle 12 into the second gaseous state.

[0065] On the one hand, by setting the multi-way valve 14 and the switching assembly 15, the heat exchange system 100 of the swapping station can have the first heat exchange mode and the second heat exchange mode, that is, the heat exchange system 100 of the swapping station can have the heating mode and the cooling mode. For example, the heat exchange system 100 of the swapping station can not only cool the battery pack 200 of the swapping station, but also preheat the battery pack 200 of the swapping station, effectively controlling the charging temperature of the battery pack 200 of the swapping station, thereby improving the charging efficiency and service life of the battery pack 200 of the swapping station. On the other hand, by setting the switching assembly 15, when the heat exchange system 100 of the swapping station switches between the first heat exchange mode and the second heat exchange mode, the refrigerant passing through the cooling device 20 always remains a high-pressure refrigerant, which can effectively prevent the cooling device 20 from condensing and ensure the normal operation of the cooling device 20.

[0066] In a specific embodiment, the multi-way valve 14 can be a four-way valve. Of course, in other specific embodiments, the multi-way valve 14 can also be a five-way valve, a six-way valve, etc., which are not limited herein.

[0067] Among them, the design pressure and design temperature of the multi-way valve 14 are not limited; for example, the design pressure of the multi-way valve 14 is 4.5 MPa and the design temperature is 150 °C.

[0068] In a specific embodiment, the switching component 15 includes a first check valve 151, a second check valve 152, a third check valve 153, and a fourth check valve 154; the input end of the first check valve 151 is connected to the second end 1312 of the first heat exchanger 131, and the output end of the first check valve 151 is connected to the input end 161 of the first liquid refrigerant passage 16; the input end of the second check valve 152 is connected to the output end 162 of the first liquid refrigerant passage 16, and the output end of the second check valve 152 is connected to the second end 1322 of the second heat exchanger 132; the input end of the third check valve 153 is connected to the second end 1322 of the second heat exchanger 132, and the output end of the third check valve 153 is connected to the input end 161 of the first liquid refrigerant passage 16; the input end of the fourth check valve 154 is connected to the output end 162 of the first liquid refrigerant passage 16, and the output end of the fourth check valve 154 is connected to the second end 1312 of the first heat exchanger 131.

[0069] That is to say, when the heat exchange system 100 of the battery swapping station switches between the first heat exchange mode and the second heat exchange mode, the combination of 4 check valves ensures that the refrigerant flowing through the cooling device 20 always remains high-pressure refrigerant, which can effectively prevent the cooling device 20 from condensing and ensure the normal operation of the cooling device 20.

[0070] Among them, the design pressure and design temperature of the check valve are not limited; for example, the design pressure of the check valve is 4.5 MPa and the design temperature is 150 °C.

[0071] Of course, in other embodiments, the refrigerant flowing through the cooling device 20 can also be the first gaseous refrigerant. Since the first gaseous refrigerant is discharged from the exhaust end 111 of the variable frequency compressor 11, it shows that the cooling device 20 is arranged after the exhaust end 111 of the variable frequency compressor 11; since the first gaseous refrigerant discharged from the exhaust end 111 of the variable frequency compressor 11 is condensed into the first liquid refrigerant by one of the heat exchangers 13, it shows that the cooling device 20 is arranged before the heat exchanger 13 for condensing the first gaseous refrigerant into the first liquid refrigerant. Therefore, the cooling device 20 is arranged between the exhaust end 111 of the variable frequency compressor 11 and the heat exchanger 13 for condensing the first gaseous refrigerant into the first liquid refrigerant.

[0072] In one embodiment, as Figure 4As shown, the refrigerant circuit 10 further includes a gas detection assembly 19. The gas detection assembly 19 includes an exhaust pressure sensor 191 and an exhaust temperature sensor 192 disposed at the exhaust end 111 of the variable-frequency compressor 11, and / or a suction pressure sensor 193 and a suction temperature sensor 194 disposed at the suction end 112 of the variable-frequency compressor 11. The refrigerant flow rate output by the throttle 12 is determined based on the data detected by the gas detection assembly 19. That is to say, the opening degree of the throttle 12 is calculated based on the data detected by the gas detection assembly 19. Since the refrigerant flow rate output by the throttle 12 is determined based on the data detected by the gas detection assembly 19, the refrigerant flow rate output by the throttle 12 matches the demand of the evaporator, and there will be no situation of excessive or insufficient liquid supply.

[0073] In one embodiment, as Figure 4 shown, the refrigerant circuit 10 further includes a gas-liquid separator 109. The gas-liquid separator 109 is disposed at the suction end 112 of the variable-frequency compressor 11. In the heat exchange system 100 of the battery swapping station, for the heat exchanger 13 that evaporates the second liquid refrigerant into the second gaseous refrigerant, the refrigerant at the outlet should be pure gaseous. However, under actual working conditions (such as sudden load change, low-temperature startup, or improper adjustment of the throttle 12, etc.), unevaporated liquid refrigerant may be entrained into the variable-frequency compressor 11. On the one hand, the liquid refrigerant is incompressible. Entering the variable-frequency compressor 11 will cause mechanical damages such as fracture of the cylinder valve plate and deformation of the crankshaft of the variable-frequency compressor 11. On the other hand, the liquid refrigerant is mixed with the lubricating oil, which will reduce the lubrication effect and aggravate the wear. Therefore, by disposing the gas-liquid separator 109 at the suction end 112 of the variable-frequency compressor 11, the gaseous and liquid refrigerants can be separated, ensuring that only the gaseous refrigerant enters the variable-frequency compressor 11, thereby protecting the variable-frequency compressor 11 from the impact and damage of the liquid refrigerant.

[0074] Among them, the design pressure and design temperature of the gas-liquid separator 109 are not limited; for example, the design pressure of the gas-liquid separator 109 is 4.5 MPa and the design temperature is 150 °C.

[0075] In a specific embodiment, the refrigerant circuit 10 includes a gas detection assembly 19 and a gas-liquid separator 109. The gas detection assembly 19 includes a suction pressure sensor 193 and a suction temperature sensor 194 disposed at the suction end 112. The gas-liquid separator 109 is disposed closer to the suction end 112 of the variable-frequency compressor 11 than the gas detection assembly 19.

[0076] In one embodiment, the cooling device 20 can be a cooling plate. The cooling plate has a large surface area and can cool the frequency converter of the variable-frequency compressor 11 more efficiently.

[0077] The variable-frequency compressor 11 can effectively control the operating frequency of the variable-frequency compressor 11 by changing the power frequency through an integrated frequency converter, so as to adjust the refrigeration or heating function according to the actual load demand, improve the energy utilization rate, and achieve energy conservation and emission reduction; that is, adopting a variable-frequency stepless load regulation mode can adjust according to the actual load demand, avoiding waste of energy and achieving energy conservation and consumption reduction.

[0078] For example, when the number of battery packs 200 in the battery compartment of the battery swapping station increases or decreases, the load demand of the battery compartment of the battery swapping station changes. Since the variable-frequency compressor 11 is adopted, the operating frequency of the variable-frequency compressor 11 can be controlled by changing the power frequency to match the actual load demand of the battery compartment of the battery swapping station, improve the energy utilization rate, and achieve energy conservation and emission reduction.

[0079] Among them, the adjustment range of the operating frequency of the variable-frequency compressor 11 is not limited and can be specifically set according to actual usage needs. For example, the adjustment range of the operating frequency of the variable-frequency compressor 11 is 20 - 100 Hz.

[0080] In a specific embodiment, the variable-frequency compressor 11 can specifically be a DC variable-frequency scroll compressor. On the one hand, the DC variable-frequency scroll compressor can effectively control the operating frequency of the variable-frequency compressor 11 by changing the power frequency through an integrated frequency converter, so as to adjust the refrigeration or heating function according to the actual load demand, improve the energy utilization rate, and achieve energy conservation and emission reduction; on the other hand, the DC variable-frequency scroll compressor has the advantages of high efficiency, stability, and low noise.

[0081] Among them, the design power, design refrigerating capacity, and design operating frequency of the DC variable-frequency scroll compressor are not limited and can be specifically set according to actual usage needs. For example, the design power of the DC variable-frequency scroll compressor is 17.96 kW, the design refrigerating capacity is 60.0 kW, and the design operating frequency is 98 Hz.

[0082] Of course, in other specific embodiments, the variable-frequency compressor 11 can also be a variable-frequency rolling piston compressor, a variable-frequency screw compressor, a variable-frequency centrifugal compressor, a variable-frequency reciprocating (piston) compressor, a variable-frequency rotary compressor, etc., which are not limited herein.

[0083] In one embodiment, at least one heat exchanger 13 can be a plate heat exchanger. On the one hand, the plate heat exchanger has a compact structure and can reduce the volume of the heat exchange system 100 of the battery swapping station; on the other hand, the plate heat exchanger has a high heat exchange efficiency and can effectively adjust the temperature of the battery pack 200 of the battery swapping station; on the other hand, the plate heat exchanger is easy to maintain.

[0084] The heat exchange system 100 of the battery swapping station is used to cool the battery packs 200 in the battery compartments of the battery swapping station. At least two heat exchangers 13 include heat exchanger A and heat exchanger B, and both are plate heat exchangers. Taking the example that heat exchanger A is used for heat exchange with the external environment and the coolant in the coolant circuit 30 exchanges heat with the refrigerant in the refrigerant circuit 10 through heat exchanger B, the heat exchange processes of heat exchanger A and heat exchanger B are described as follows: After the refrigerant is compressed into a first gaseous refrigerant by the variable frequency compressor 11 and discharged from the exhaust end 111 of the variable frequency compressor 11, it enters the refrigerant side of heat exchanger A; the cooling medium cools down after dissipating heat to the environment through a cooling tower or an air cooler and then enters the water side of heat exchanger A; the cooling medium exchanges heat with the first gaseous refrigerant through heat exchanger A. The cooling medium absorbs heat and warms up, and the first gaseous refrigerant releases heat and condenses into a first liquid refrigerant. The cooling medium on the water side of heat exchanger A that has absorbed heat and warmed up dissipates heat to the environment through a cooling tower or an air cooler, and the cooled cooling medium returns to the water side of heat exchanger A to exchange heat with the first gaseous refrigerant flowing through heat exchanger A again, forming a closed loop. After the first liquid refrigerant is throttled and depressurized into a second liquid refrigerant by the throttler 12, it enters the refrigerant side of heat exchanger B; the coolant in the coolant circuit 30 absorbs heat from the battery packs 200 in the battery compartments of the battery swapping station and warms up, then enters the water side of heat exchanger B. The coolant absorbs the heat generated by the battery packs 200 to cool the battery packs 200; the warmed-up coolant exchanges heat with the second liquid refrigerant through heat exchanger B. The warmed-up coolant releases heat, and the second liquid refrigerant absorbs heat and evaporates into a second gaseous refrigerant. The coolant on the water side of heat exchanger B that has been cooled is transported out of heat exchanger B, and then the coolant absorbs the heat of the battery packs 200 to cool the battery packs 200. The warmed-up coolant returns to the water side of heat exchanger B to exchange heat with the second liquid refrigerant flowing through heat exchanger B again, forming a closed loop.

[0085] On the one hand, since both heat exchanger A and heat exchanger B of the heat exchange system 100 of the battery swapping station are plate heat exchangers, the heat exchange system 100 of the battery swapping station can exchange heat with the battery packs 200 in the battery compartments of the battery swapping station more effectively, that is, it can absorb and transfer the heat generated by the battery packs 200 in the battery compartments of the battery swapping station more effectively, realize the effective cooling of the battery packs 200 in the battery compartments of the battery swapping station, that is to say, it can effectively control the charging temperature of the battery packs 200 in the battery compartments of the battery swapping station and improve the charging efficiency and service life of the battery packs 200 in the battery compartments of the battery swapping station; on the other hand, since the structure of the plate heat exchanger is compact and both heat exchanger A and heat exchanger B of the heat exchange system 100 of the battery swapping station are plate heat exchangers, the volume of the heat exchange system 100 of the battery swapping station is smaller.

[0086] The heat exchange system 100 of the battery swapping station is used to preheat the battery packs 200 in the battery compartments of the battery swapping station. At least two heat exchangers 13 include heat exchanger A and heat exchanger B, and both are plate heat exchangers. Heat exchanger A is used for heat exchange with the external environment. Taking the example that the coolant in the coolant circuit 30 exchanges heat with the refrigerant in the refrigerant circuit 10 through heat exchanger B, the heat exchange process of heat exchanger A and heat exchanger B is described as follows: After the refrigerant is compressed into a first gaseous refrigerant by the variable frequency compressor 11 and discharged through the exhaust end 111 of the variable frequency compressor 11, it enters the refrigerant side of heat exchanger B; after the coolant releases heat to the battery packs 200 in the battery compartments of the battery swapping station and cools down, it enters the water side of heat exchanger B. The coolant releases heat to the battery packs 200 to preheat the battery packs 200; the coolant after heat release and cooling exchanges heat with the first gaseous refrigerant through heat exchanger B. The coolant after heat release and cooling absorbs heat, and the first gaseous refrigerant releases heat and condenses into a first liquid refrigerant. The coolant on the water side of heat exchanger B after absorbing heat and rising in temperature is transported out of heat exchanger B, and then the coolant releases heat to preheat the battery packs 200. The coolant after heat release and cooling returns to the water side of heat exchanger B and exchanges heat with the first gaseous refrigerant flowing through heat exchanger B again to form a closed loop. After the first liquid refrigerant is throttled and depressurized into a second liquid refrigerant by the throttler 12, it enters the refrigerant side of heat exchanger A; the cooling medium absorbs heat from the external environment and rises in temperature, and enters the water side of heat exchanger A; the second liquid refrigerant exchanges heat with the cooling medium after absorbing heat and rising in temperature through heat exchanger A. The cooling medium after absorbing heat and rising in temperature releases heat, and the second liquid refrigerant absorbs heat and evaporates into a second gaseous refrigerant. The cooling medium on the water side of heat exchanger A after heat release and cooling absorbs heat from the external environment and rises in temperature again to form a closed loop.

[0087] Among them, the material, heat exchange area, design temperature, design pressure, outlet water temperature (the temperature when the cooling medium flows out of the water side of the plate heat exchanger), and flow rate (the fluid volume of the cooling medium passing through the plate heat exchanger per unit time) of the plate heat exchanger are not limited and can be specifically set according to actual usage needs. For example, the material of the plate heat exchanger is stainless steel, the heat exchange area of the plate heat exchanger is 8.03 m 2 or 10.12 m 2 ; the design pressure of the plate heat exchanger is 45.0 MPa, the design temperature of the plate heat exchanger is 150 °C, the flow rate of the plate heat exchanger is 133.3 L / min, and the outlet water temperature is 10 °C.

[0088] It should be noted that when each heat exchanger 13 is a plate heat exchanger, the materials, heat transfer areas, design temperatures, and design pressures of each plate heat exchanger can be the same or different, and are not limited herein. For example, taking at least two heat exchangers 13 including heat exchanger A and heat exchanger B, and both heat exchanger A and heat exchanger B being plate heat exchangers as an example: the materials of heat exchanger A and heat exchanger B are both stainless steel; the heat transfer area of heat exchanger A is 8.03 m 2 , and the heat transfer area of heat exchanger B is 10.12 m 2 ; the design pressures of heat exchanger A and heat exchanger B are both 45.0 MPa; the design temperatures of heat exchanger A and heat exchanger B are both 150 °C.

[0089] Of course, in other embodiments, at least one heat exchanger 13 can also be a shell-and-tube heat exchanger, a finned-tube heat exchanger, an immersion heat exchanger, a regenerative heat exchanger, a microchannel heat exchanger, etc., and are not limited herein.

[0090] In one embodiment, the coolant in the coolant circuit 30 can be an ethylene glycol aqueous solution. On the one hand, in a low-temperature environment, the ethylene glycol aqueous solution can still remain liquid and will not freeze at 0 °C like pure water, thus ensuring normal circulation in a low-temperature environment, preventing failures due to freezing, ensuring the normal circulation of the heat exchange system 100 of the swapping station in a low-temperature environment, and further ensuring that the heat exchange system 100 of the swapping station effectively heats the battery pack 200 of the swapping station, avoiding the battery pack 200 of the swapping station from freezing in a low-temperature environment. On the other hand, the ethylene glycol aqueous solution has good thermal conductivity and can effectively exchange heat with the refrigerant in the refrigerant circuit 10 through the heat exchanger 13, thereby effectively preheating the battery pack 200 of the swapping station and preventing the battery pack 200 of the swapping station from freezing due to being in a low-temperature environment.

[0091] Of course, in other embodiments, the coolant in the coolant circuit 30 can also be an oil medium (such as mineral oil, silicone oil, fluorinated liquid, etc.), pure water, deionized water, etc., and are not limited herein.

[0092] The heat exchanger 13 where the secondary refrigerant of the secondary refrigerant circuit 30 exchanges heat with the refrigerant of the refrigerant circuit 10 can be regarded as a heat exchanger shared by the secondary refrigerant circuit 30 and the refrigerant circuit 10. In one embodiment, the refrigerant circuit 10 further includes at least one heat exchanger 13 that is not shared with the secondary refrigerant circuit 30, and the cooling medium of the at least one non-shared heat exchanger 13 can be an ethylene glycol aqueous solution. In a low-temperature environment, the ethylene glycol aqueous solution can still remain liquid and will not freeze at 0°C like pure water, thus ensuring the normal circulation of the cooling medium of the heat exchanger 13 in a low-temperature environment, preventing failures due to the freezing of the cooling medium, thereby ensuring the normal circulation of the heat exchange system 100 of the battery swapping station in a low-temperature environment, and further ensuring that the heat exchange system 100 of the battery swapping station effectively heats the battery pack 200 of the battery swapping station, avoiding the freezing of the battery pack 200 of the battery swapping station in a low-temperature environment.

[0093] Of course, in other embodiments, the cooling medium of the at least one non-shared heat exchanger 13 can also be an oil medium (such as mineral oil, silicone oil, fluorinated liquid, etc.), pure water, deionized water, etc., which are not limited herein.

[0094] Among them, the mass concentration and freezing point of the ethylene glycol aqueous solution are not limited and can be specifically set according to actual usage needs. For example, the mass concentration of the ethylene glycol aqueous solution is 55% and the freezing point of the ethylene glycol aqueous solution is -45°C.

[0095] In one embodiment, the throttler 12 can be an expansion valve. On the one hand, the expansion valve throttles the first liquid refrigerant into the second liquid refrigerant, creating conditions for the evaporator to absorb heat; on the other hand, the expansion valve dynamically adjusts the opening according to the load of the heat exchange system 100 of the battery swapping station to match the requirements of the evaporator and avoid overfeeding or underfeeding.

[0096] In a specific embodiment, the expansion valve can specifically be an electronic expansion valve. The opening of the electronic expansion valve is calculated based on the data fed back by the discharge pressure sensor 191 and the discharge temperature sensor 192 provided at the discharge end 111 of the variable-frequency compressor 11, and the suction pressure sensor 193 and the suction temperature sensor 194 provided at the suction end 112 of the variable-frequency compressor 11.

[0097] Among them, the design pressure and design temperature of the electronic expansion valve are not limited; for example, the design pressure of the electronic expansion valve is 4.5 MPa and the design temperature is 150°C.

[0098] Of course, in other specific embodiments, the expansion valve can also be a thermal expansion valve, which is not limited herein.

[0099] Of course, in other embodiments, the throttler 12 can also be a capillary tube, which is not limited herein.

[0100] In one embodiment, as Figure 5 shown, Figure 5 FIG. Figure 5 is a schematic structural diagram of an embodiment of a secondary refrigerant circuit provided by the present application. The heat exchanger 13 where the secondary refrigerant circuit 30 exchanges heat with the refrigerant circuit 10 includes a secondary refrigerant input end 133 and a secondary refrigerant output end 134. The secondary refrigerant circuit 30 includes a liquid inlet pipeline, a liquid outlet pipeline, and a battery pipeline (not shown in the figure) provided corresponding to the battery pack 200. The input end of the liquid inlet pipeline is communicated with the secondary refrigerant output end 134, the output end of the liquid inlet pipeline is communicated with the input end of the battery pipeline, the input end of the liquid outlet pipeline is communicated with the output end of the battery pipeline, and the output end of the liquid outlet pipeline is communicated with the secondary refrigerant input end 133.

[0101] Since the input end of the liquid inlet pipeline is communicated with the secondary refrigerant output end 134 and the output end of the liquid inlet pipeline is communicated with the input end of the battery pipeline, after the secondary refrigerant exchanges heat with the refrigerant in the refrigerant circuit 10 through the heat exchanger 13, it can be transported to the battery pipeline provided corresponding to the battery pack 200; the secondary refrigerant exchanges heat with the battery pack through the battery pipeline to adjust the temperature of the battery pack 200. Since the input end of the liquid outlet pipeline is communicated with the output end of the battery pipeline, the secondary refrigerant after exchanging heat with the battery pack 200 can be transported out of the battery pipeline, ensuring that the secondary refrigerant after exchanging heat with the refrigerant in the refrigerant circuit 10 can be continuously transported to the battery pipeline to stably adjust the temperature of the battery pack 200. Since the output end of the liquid outlet pipeline is communicated with the secondary refrigerant input end 133, the secondary refrigerant after exchanging heat with the battery pack 200 can be transported back to the heat exchanger 13 to exchange heat with the refrigerant in the refrigerant circuit 10 again through the heat exchanger 13.

[0102] It should be noted that, as Figure 5 shown, at the other two ends of the heat exchanger 13, one end is for the refrigerant to flow in. The secondary refrigerant in the secondary refrigerant circuit 30 exchanges heat with the refrigerant through the heat exchanger 13, and the refrigerant after exchanging heat with the secondary refrigerant flows out from the other end of the heat exchanger 13.

[0103] In one embodiment, a plurality of control valves 311 are provided in the liquid inlet pipeline, and each control valve 311 is respectively used to control the flow rate of the secondary refrigerant in the battery pipeline corresponding to at least one battery pack 200. By providing the control valves 311, the flow rate of the secondary refrigerant in the battery pipeline corresponding to each battery pack 200 can be accurately controlled, so as to ensure that each battery pack 200 obtains an appropriate cooling or preheating effect and realize the precise control of the temperature of the battery pack 200.

[0104] In a specific embodiment, a plurality of control valves 311 are provided in the liquid inlet pipeline, and each control valve 311 is respectively used to control the flow rate of the secondary refrigerant in the battery pipeline corresponding to one battery pack 200.

[0105] In one embodiment, the liquid inlet pipeline includes a liquid inlet main pipeline 312, a battery liquid inlet branch 313, and a first two-way valve 315. The liquid outlet pipeline includes a liquid outlet main pipeline 321, a battery liquid outlet branch 322, and a second two-way valve 324. The input end of the liquid inlet main pipeline 312 is communicated with the coolant output end 134. The output end of the liquid inlet main pipeline 312 is communicated with the input end of the battery liquid inlet branch 313 through the first two-way valve 315. The output end of the battery liquid inlet branch 313 is communicated with the input end of the battery liquid outlet branch 322 through the battery pipeline. The input end of the liquid outlet main pipeline 321 is communicated with the output end of the battery liquid outlet branch 322 through the second two-way valve 324. The input end of the liquid outlet main pipeline 321 is communicated with the coolant input end 133.

[0106] The input end of the liquid inlet main pipeline 312 is communicated with the coolant output end 134. Therefore, after the coolant exchanges heat with the refrigerant in the refrigerant circuit 10 through the heat exchanger 13, it can be transported to the liquid inlet main pipeline 312. The output end of the liquid inlet main pipeline 312 is communicated with the input end of the battery liquid inlet branch 313 through the first two-way valve 315, and the output end of the battery liquid inlet branch 313 is communicated with the battery pipeline. Therefore, the coolant that has exchanged heat with the refrigerant in the refrigerant circuit 10 can be transported to regulate the temperature of the battery pack 200.

[0107] The output end of the battery liquid inlet branch 313 is communicated with the input end of the battery liquid outlet branch 322 through the battery pipeline. Therefore, the coolant that has exchanged heat with the battery pack 200 can be transported out of the battery pipeline, ensuring that the coolant that has exchanged heat with the refrigerant in the refrigerant circuit 10 can be continuously transported to regulate the temperature of the battery pack 200, so as to stably regulate the temperature of the battery pack 200. The input end of the liquid outlet main pipeline 321 is communicated with the output end of the battery liquid outlet branch 322 through the second two-way valve 324, and the input end of the liquid outlet main pipeline 321 is communicated with the coolant input end 133. Therefore, the coolant that has exchanged heat with the battery pack 200 can be transported to the heat exchanger 13 to re-exchange heat with the refrigerant in the refrigerant circuit 10 through the heat exchanger.

[0108] In one embodiment, the liquid inlet pipeline includes a drain valve 316, a liquid inlet filter 317, and a butterfly valve 318 connected in sequence according to the flow direction of the coolant; the liquid outlet pipeline includes a coolant driving component 327, and the coolant driving component 327 is used to drive the coolant to flow in the coolant circuit 30.

[0109] It should be noted that Figure 5 the arrow direction in the figure is the flow direction of the coolant.

[0110] In a specific embodiment, the liquid outlet pipeline may further include a drain valve, a safety valve, etc., which are not limited herein.

[0111] In a specific embodiment, a main engine clamp interface 319 is further provided between the output end of the butterfly valve 318 and the input end of the first two-way valve 315. The setting of the main engine clamp interface 319 can connect the output end of the butterfly valve 318 and the input end of the first two-way valve 315, ensuring the sealing performance and stability between the output end of the butterfly valve 318 and the input end of the first two-way valve 315.

[0112] In a specific embodiment, the secondary coolant drive assembly 327 includes a water pump.

[0113] Of course, in other specific embodiments, the secondary coolant drive assembly 327 may also include a butterfly valve, a check valve, etc., which are not limited herein.

[0114] Please refer to Figure 6 , Figure 6 , which is a schematic structural diagram of an embodiment of the battery swapping station provided by the present application. The present application also provides a battery swapping station 300, which includes a battery pack 200 and the heat exchange system 100 of the battery swapping station described above. The heat exchange system 100 of the battery swapping station is used to adjust the temperature of the battery pack 200. Since the heat exchange system 100 of the battery swapping station includes a cooling device 20 provided corresponding to the frequency converter of the variable frequency compressor 11, therefore, when the heat exchange system 100 of the battery swapping station adjusts the temperature of the battery pack 200, it can dissipate the heat generated by the operation of the frequency converter of the variable frequency compressor 11, reduce the working temperature of the frequency converter of the variable frequency compressor 11, reduce the occurrence of abnormal operation of the frequency converter of the variable frequency compressor 11 due to excessive temperature, ensure the normal operation of the frequency converter of the variable frequency compressor 11, and improve the operation stability and service life of the frequency converter of the variable frequency compressor 11; further, when the heat exchange system 100 of the battery swapping station has both a heating mode and a cooling mode, by reducing the working temperature of the frequency converter of the variable frequency compressor 11 through the cooling device, it can further prevent the occurrence of condensation phenomenon of the frequency converter of the variable frequency compressor 11 when switching between the cooling mode and the heating mode.

[0115] In addition, the cooling device 20 cools the frequency converter of the variable frequency compressor 11 by using the refrigerant. On the one hand, it cools the frequency converter of the variable frequency compressor 11 by reusing the refrigerant in the refrigerant circuit 10, reducing the volume and cost of the heat exchange system 100 of the battery swapping station; on the other hand, the refrigerant in the refrigerant circuit 10 has a large specific heat capacity, and can carry more heat per unit volume, and can more effectively cool the frequency converter of the variable frequency compressor 11.

[0116] Furthermore, the cooling device 20 is arranged between the exhaust end 111 of the compressor 11 and the input end 121 of the throttle 12 in the refrigerant circuit 10, ensuring that the refrigerant passing through the cooling device 20 always remains high-pressure refrigerant, which can effectively prevent the cooling device 20 from condensing and ensure the normal operation of the cooling device 20.

[0117] Furthermore, the coolant in the coolant circuit 30 exchanges heat with the refrigerant in the refrigerant circuit 10 at at least one heat exchanger 13. The heat exchange system 100 of the battery swapping station can effectively adjust the temperature of the battery pack 200, effectively control the charging temperature of the battery pack 200, thereby improving the charging efficiency and lifespan of the battery pack 200.

[0118] The above are only the embodiments of the present application, and thus do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall equally be included in the patent protection scope of the present application.

Claims

1. A heat exchange system for a power station, characterized in that: include: A refrigerant circuit, comprising a variable frequency compressor, a throttle and at least two heat exchangers, wherein the refrigerant is compressed into a first gas state by the variable frequency compressor and discharged through the exhaust end of the variable frequency compressor, and then condensed into a first liquid state through one of the heat exchangers, and the first liquid state refrigerant is throttled and depressurized into a second liquid state by the throttle, and then evaporated into a second gas state through another of the heat exchangers; A cooling device is provided in the refrigerant circuit and between the exhaust end of the variable frequency compressor and the input end of the throttle, and is provided corresponding to the inverter of the variable frequency compressor, and the cooling device is used to cool the inverter by using the refrigerant; A coolant circuit is provided corresponding to the battery pack of the battery swap station. The coolant circuit is used to transport a coolant. The coolant in the coolant circuit exchanges heat with the refrigerant through at least one heat exchanger to adjust the temperature of the battery pack.

2. The system according to claim 1, characterized in that The refrigerant flowing through the cooling device is the first liquid refrigerant.

3. The system according to claim 2, characterized in that The refrigerant circuit includes a first liquid refrigerant passage, which is arranged between the at least two heat exchangers. The first liquid refrigerant passage is provided with the cooling device and the throttle for passing the first liquid refrigerant, and allowing the first liquid refrigerant to pass through the cooling device and the throttle in sequence.

4. The system according to claim 3, characterized in that The first liquid refrigerant passage is further provided with at least one of the following: a liquid accumulator, the liquid accumulator being disposed between the cooling device and an input end of the first liquid refrigerant passage, and being used to store the first liquid refrigerant and output the stored first liquid refrigerant to the throttle through the cooling device; A drying filter is disposed between the cooling device and the throttle, and is used for filtering the first liquid refrigerant output by the cooling device and outputting the refrigerant to the throttle.

5. The system according to claim 3 or 4, characterized in that: The heat exchange system has a first heat exchange mode and a second heat exchange mode, the at least two heat exchangers include a first heat exchanger and a second heat exchanger, the secondary coolant circuit and the refrigerant circuit perform heat exchange through the second heat exchanger, the refrigerant circuit also includes a multi-way valve and a switching component, the exhaust end of the variable frequency compressor is respectively connected to the first end of the first heat exchanger and the first end of the second heat exchanger through the multi-way valve, and the switching component is respectively connected to the second end of the first heat exchanger, the second end of the second heat exchanger, and the two ends of the first liquid refrigerant passage; In the first heat exchange mode, the multi-way valve connects the exhaust end of the variable frequency compressor to the first end of the first heat exchanger, so that the first heat exchanger condenses the first gaseous refrigerant into the first liquid state, the switching component switches the input end of the first liquid refrigerant passage to be connected to the second end of the first heat exchanger, and the output end of the first liquid refrigerant passage is switched to be connected to the second end of the second heat exchanger, so that the first heat exchanger provides the first liquid refrigerant to the throttle, and the second heat exchanger evaporates the second liquid refrigerant output by the throttle into the second gaseous state; In the second heat exchange mode, the multi-way valve connects the exhaust end of the variable frequency compressor to the first end of the second heat exchanger so that the first gaseous refrigerant is condensed into the first liquid by the second heat exchanger, and the switching component switches the input end of the first liquid refrigerant passage to be connected to the second end of the second heat exchanger, and the output end of the first liquid refrigerant passage is switched to be connected to the second end of the first heat exchanger, so that the second heat exchanger provides the first liquid refrigerant to the throttle, and the first heat exchanger evaporates the second liquid refrigerant output by the throttle into the second gas.

6. The system according to claim 5, characterized in that The switching component comprises: a first one-way valve, wherein an input end of the first one-way valve is connected to the second end of the first heat exchanger, and an output end of the first one-way valve is connected to an input end of the first liquid refrigerant passage; a second one-way valve, wherein an input end of the second one-way valve is connected to an output end of the first liquid refrigerant passage, and an output end of the second one-way valve is connected to a second end of the second heat exchanger; a third one-way valve, wherein an input end of the third one-way valve is connected to the second end of the second heat exchanger, and an output end of the third one-way valve is connected to an input end of the first liquid refrigerant passage; A fourth one-way valve, wherein the input end of the fourth one-way valve is connected to the output end of the first liquid refrigerant passage, and the output end of the fourth one-way valve is connected to the second end of the first heat exchanger.

7. The system according to claim 1, characterized in that The refrigerant circuit further comprises at least one of the following: A gas detection component, the gas detection component comprising an exhaust pressure sensor and an exhaust temperature sensor disposed at the exhaust end of the variable frequency compressor, and / or, a suction pressure sensor and a suction temperature sensor disposed at the suction end of the variable frequency compressor, the refrigerant flow rate output by the throttle being determined based on data detected by the gas detection component; A gas-liquid separator is arranged at the suction end of the variable frequency compressor.

8. The system according to claim 1, characterized in that At least one of the heat exchangers is a plate heat exchanger; and / or, the cooling medium of at least one of the heat exchangers is an ethylene glycol aqueous solution; And / or, the throttle is an expansion valve; And / or, the cooling device is a cooling plate; And / or, the variable frequency compressor is a DC variable frequency scroll compressor.

9. The system according to claim 1, characterized in that The heat exchanger for the brine circuit to perform heat exchange with the refrigerant circuit includes a brine input end and a brine output end; The coolant circuit includes a liquid inlet pipeline, a liquid outlet pipeline, and a battery pipeline corresponding to the battery pack. The input end of the liquid inlet pipeline is connected to the coolant output end, the output end of the liquid inlet pipeline is connected to the input end of the battery pipeline, the input end of the liquid outlet pipeline is connected to the output end of the battery pipeline, and the output end of the liquid outlet pipeline is connected to the coolant input end.

10. The system according to claim 9, characterized in that The liquid inlet pipeline is provided with a plurality of control valves, and each of the control valves is used to control the flow rate of the coolant in the battery pipeline corresponding to at least one of the battery packs.

11. The system according to claim 9, characterized in that The liquid inlet pipeline includes a drain valve, a liquid inlet filter, and a butterfly valve which are connected in sequence according to the flow direction of the coolant; The liquid outlet pipeline includes a refrigerant driving component, and the refrigerant driving component is used to drive the refrigerant to flow in the refrigerant circuit.

12. A battery swap station, characterized in that: The battery swap station includes a battery pack and a heat exchange system as described in any one of claims 1 to 11, and the heat exchange system is used to regulate the temperature of the battery pack.

Images