Charging pile heat exchange system

Abstract

The application provides a charging pile heat exchange system, which comprises a flow path, an ambient temperature sensor and a control unit, wherein the ambient temperature sensor is electrically connected with the control unit; the flow path comprises a main path, a first branch path, a second branch path and a refrigeration circuit; the main path comprises a liquid pump and a first heat exchanger; the first branch path is connected in series with the main path, and the first branch path comprises a second heat exchanger; the second branch path is connected in series with the main path, and the second branch path comprises a first heat exchange part; the first branch path and the second branch path are connected in parallel; the refrigeration circuit comprises a second heat exchange part, and the second heat exchange part is configured to exchange heat with the first heat exchange part; the charging pile heat exchange system has a heat exchange working state; in the heat exchange working state, the first heat exchanger exchanges heat with a power module; the control unit can regulate and control the flow of the cold carrier into the first branch path and / or the second branch path configured to be cooled by the refrigeration circuit according to the ambient temperature monitored by the ambient temperature sensor, so that the heat dissipation effect is ensured and the energy saving effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of super charging piles, in particular, relates to a charging pile heat exchange system. BACKGROUND

[0002] With the rapid development of new energy vehicles, the demand for super charging piles is also increasing. In order to ensure that the new energy vehicle battery can be quickly filled, the design power of the super charging pile is getting larger and larger, and the heat generated during charging is also getting larger and larger. The super charging pile needs a cooling system to ensure that the power module chip does not overheat and cause functional failure during charging. In the related art, the heat dissipation system of the super charging pile, the system using natural cooling method is difficult to guarantee the heat dissipation effect, and the energy efficiency ratio of the refrigeration cycle heat dissipation method is low, so it is necessary to propose an improved charging pile heat exchange system. SUMMARY

[0003] To solve the above problems, the present application provides a charging pile heat exchange system, which guarantees the heat dissipation effect while having the effect of energy saving.

[0004] The present application provides a charging pile heat exchange system for heat exchange of a power module in a charging pile shell, the charging pile heat exchange system comprising a flow path, an ambient temperature sensor and a control unit, the ambient temperature sensor being at least partially disposed outside the charging pile shell, the ambient temperature sensor being electrically connected with the control unit;

[0005] The flow path comprises a main path, a first branch path, a second branch path and a refrigeration circuit, the main path comprising a liquid pump and a first heat exchanger, the liquid pump and the first heat exchanger being connected in series; the first branch path is connected in series with the main path, the first branch path comprising a second heat exchanger; the second branch path is connected in series with the main path, the second branch path comprising a first heat exchange part; the first branch path and the second branch path are connected in parallel, the refrigeration circuit comprising a second heat exchange part, a compressor and a third heat exchanger, the second heat exchange part, the compressor and the third heat exchanger being connected in series, the second heat exchange part being configured to exchange heat with the first heat exchange part;

[0006] The charging pile heat exchange system comprises an adjusting valve, at least one of the first branch path and the second branch path is provided with the adjusting valve; or the first branch path, the second branch path and the main path have two connecting parts, at least one of the connecting parts is provided with the adjusting valve; the adjusting valve is electrically connected with the control unit;

[0007] The charging pile heat exchange system has a heat exchange working state, in the heat exchange working state, the main path, the first branch path and the second branch path circulate the cold carrier, the refrigeration circuit circulates the refrigerant, the first heat exchanger exchanges heat with the power module, and the control unit controls the adjusting valve to adjust the flow of the cold carrier entering the first branch path and / or the second branch path according to the ambient temperature monitored by the ambient temperature sensor.

[0008] The charging pile heat exchange system provided by the application can regulate the flow of the cold carrier into the first branch and / or the second branch configured by the refrigeration circuit to reduce the temperature according to the ambient temperature in the heat exchange state, so as to ensure the heat dissipation effect and save energy. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and all other drawings obtained by those skilled in the art without creative labor based on these drawings also belong to the protection scope of the application.

[0010] Figure 1 A schematic diagram of the charging pile heat exchange system provided by the embodiment of the application;

[0011] Figure 2 A schematic diagram of the charging pile heat exchange system provided by the embodiment of the application;

[0012] Figure 3 A schematic diagram of the charging pile heat exchange system provided by the embodiment of the application;

[0013] Figure 4 A schematic diagram of the charging pile heat exchange system provided by the embodiment of the application;

[0014] Figure 5 A schematic diagram of the charging pile heat exchange system provided by the embodiment of the application;

[0015] Figure 6 A schematic diagram of the charging pile heat exchange system provided by the embodiment of the application;

[0016] Figure 7 A schematic diagram of the charging pile heat exchange system provided by the embodiment of the application;

[0017] Figure 8 A schematic diagram of the charging pile heat exchange system provided by the embodiment of the application. DETAILED DESCRIPTION

[0018] In order to better understand the technical solutions of the application, the embodiments of the application will be described in detail below with reference to the drawings.

[0019] It should be clear that the described embodiments are only some of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the application.

[0020] As Figures 1 to 4 shown, the charging pile heat exchange system provided by the embodiment is used for heat exchange of the power module in the charging pile shell 100. The power module is an indispensable part of the charging pile. With the rapid development of new energy vehicles, the design power of the super charging pile is also getting larger and larger. The increase of power is accompanied by the increase of heat generation during charging. In order to ensure that the power module of the super charging pile does not fail due to overheating during charging, a heat exchange system needs to be configured for heat dissipation to ensure safe and effective operation of the power module. The power module is arranged in the charging pile shell 100. The charging pile heat exchange system comprises a flow path. The flow path comprises a main path 1, a first branch path 2, a second branch path 3 and a refrigeration circuit 6. The main path 1 comprises a liquid pump 10 and a first heat exchanger 11. The liquid pump 10 and the first heat exchanger 11 are connected in series. The first heat exchanger 11 is configured to exchange heat with the power module. The first branch path 2 is connected in series with the main path 1. The first branch path 2 comprises a second heat exchanger 21. The second branch path 3 is connected in series with the main path 1. The second branch path 3 comprises a first heat exchange part 31. The first branch path 2 and the second branch path 3 are connected in parallel. The refrigeration circuit 6 comprises a second heat exchange part 61, a compressor 62 and a third heat exchanger 63. The second heat exchange part 61, the compressor 62 and the third heat exchanger 63 are connected in series. The second heat exchange part 61 is configured to dissipate heat for the first heat exchange part 31. The liquid pump 10 is electrically connected with a control unit 5. The compressor 62 is electrically connected with the control unit 5. The charging pile heat exchange system has a heat exchange working state. In the heat exchange working state, the main path 1, the first branch path 2 and the second branch path 3 flow through the cold carrier. The refrigeration circuit 6 flows through the refrigerant. The second heat exchanger 21 is an air and cold carrier type heat exchanger, that is, the first branch path 2 adopts a natural cooling mode. The first heat exchange part 31 is configured to exchange heat with the refrigeration circuit 6, that is, the second branch path 3 is cooled by the refrigeration circuit 6. Therefore, the charging pile heat exchange system of the embodiment can selectively adopt a natural cooling and compression refrigeration mode or a combination of the two to dissipate heat for the power module during charging of the charging pile.

[0021] When the charging pile heat exchange system adopts a single natural cooling mode to dissipate heat for the power module, the most severe environmental conditions are usually selected for design. In the extremely hot weather environment in summer, the air flow demand is large. The fan is in high-speed operation during operation. The noise is large. The volume of the air heat exchanger is large. When the charging pile heat exchange system adopts a single compression refrigeration cycle mode to dissipate heat for the power module, the compressor still needs to be started in winter and spring to refrigerate. The energy consumption is high. The charging pile heat exchange system provided by the embodiment can selectively adopt a natural cooling and compression refrigeration mode or a combination of the two to dissipate heat for the power module during charging of the charging pile. The heat dissipation effect is guaranteed while the energy efficiency ratio is high.

[0022] Specifically, the charging pile heat exchange system in the embodiment includes an ambient temperature sensor 4 and a control unit 5. The ambient temperature sensor 4 is at least partially arranged outside the charging pile shell 100. The ambient temperature sensor 4 and the control unit 5 are configured to monitor the ambient temperature outside the charging pile shell 100. The ambient temperature sensor 4 is electrically connected to the control unit 5. In the heat exchange working state, the ambient temperature sensor 4 senses the ambient temperature outside the charging pile shell 100 and converts it into an electrical signal output to the control unit 5. The control unit 5 obtains the ambient temperature value outside the charging pile shell 100 according to the electrical signal, and controls the flow of the secondary refrigerant entering the first branch 2 and / or the second branch 3 according to the ambient temperature value. When the air cooling capacity in the natural environment can meet the heat dissipation demand of the power module, the secondary refrigerant flows through the first branch 2, and the power module is cooled by natural cooling. When the air cooling capacity in the natural environment cannot meet the heat dissipation demand of the power module, the secondary refrigerant partially or completely flows through the second branch 3, and the power module is cooled by the compression refrigeration of the refrigeration circuit 6. In one embodiment, the ambient temperature sensor 4 is installed on the outer wall of the charging pile shell 100. In another embodiment, the ambient temperature sensor 4 is arranged in the external environment and has a distance from the charging pile shell 100, thereby reducing the interference of the heat generated by the charging pile on the ambient temperature sensor 4.

[0023] In the heat dissipation mode of the charging pile heat exchange system in the heat exchange working state, the following situations exist:

[0024] Please refer to Figure 2 When the second heat exchanger 21 can meet the heat dissipation demand of the power module by using the air cooling capacity in the natural environment, the secondary refrigerant flows along the circulating loop formed by the main path 1 and the first branch 2, and the liquid pump 10 provides power for the flow of the secondary refrigerant. When the secondary refrigerant flows to the first heat exchanger 11, the secondary refrigerant exchanges heat with the power module through the first heat exchanger 11. The heat generated by the power module is transferred to the secondary refrigerant in the first heat exchanger 11, and at the same time, the secondary refrigerant also transfers its cooling capacity to the power module through the first heat exchanger 11 to cool and dissipate heat for the power module. The secondary refrigerant carrying the heat of the power module exchanges heat with the air in the environment when passing through the second heat exchanger 21. The air cooling capacity in the environment is transferred to the secondary refrigerant flowing through the second heat exchanger 21. With the flow of the secondary refrigerant, the secondary refrigerant flows out of the first branch 2 and then enters the main path 1 to cool and dissipate heat for the power module. This cycle realizes the natural cooling of the power module.

[0025] Please refer to Figure 3 When the air cooling capacity in the natural environment cannot meet the heat dissipation demand of the power module, part of the secondary refrigerant flows through the first branch 2, and the other part flows through the second branch 3, i.e. in Figure 1Based on the embodiment shown, the cold carrier flowing out of the main path 1 flows to the first branch path 2 and the second branch path 3, and the low-pressure steam of the refrigerant in the refrigeration circuit 6 is sucked into and compressed into high-pressure steam by the compressor 62, and then discharged to the third heat exchange device 63. The refrigerant exchanges heat with the air, and the air carries away the heat released by the refrigerant, so that the high-pressure refrigerant steam condenses into high-pressure liquid and enters the second heat exchange device 61. When the cold carrier carrying the heat of the power module passes through the first heat exchange device 31, the refrigerant in the second heat exchange device 61 absorbs the heat of the cold carrier in the first heat exchange device 31, so that the cold carrier is cooled and then flows into the main path 1 to cool and dissipate heat for the power module. The refrigerant in the second heat exchange device 61 absorbs heat to form low-pressure steam, which is compressed again by the compressor 62 and enters the first branch path 2. The cooling method of the cold carrier in the first branch path 2 is the same as that of the cold carrier in the second branch path 3. Figure 1 The embodiment shown is not specifically described here. In this way, the natural cooling method and the compression refrigeration method are combined to achieve power module heat dissipation.

[0026] Please refer to Figure 4 When the cold carrier flows partially through the first branch path 2 cannot meet the heat dissipation demand of the power module, the cold carrier flows entirely through the second branch path 3, and the cold carrier flowing out of the main path 1 flows entirely to the second branch path 3 to dissipate heat for the power module by the compression refrigeration method. That is, the difference between the embodiment shown and the embodiment shown in Figure 1 The difference between the embodiment shown and the embodiment shown in

[0027] Please refer to Figures 1 to 4 , and combine Figure 5 and Figure 6 The charging pile heat exchange system further comprises an adjusting valve 7. At least one of the first branch path 2 and the second branch path 3 is provided with the adjusting valve 7, or the first branch path environment temperature 2, the second branch path environment temperature 3, and the main path environment temperature 1 have two connection points, and at least one of the connection points is provided with the adjusting valve 7. The adjusting valve 7 is electrically connected to the control unit 5, and the control unit 5 adjusts the flow of the cold carrier into the first branch path 2 and / or the second branch path 3 by controlling the adjusting valve 7. The control unit 5 controls the adjusting valve 7 according to the monitored environment temperature, which is convenient and fast, and can accurately control the flow of the cold carrier into each branch path to meet the heat dissipation demand of the power module. Specifically, the adjusting valve 7 is a two-way valve, and at least one of the first branch path 2 and the second branch path 3 is provided with the two-way valve (as shown in Figure 5 ). Alternatively, the adjusting valve 7 is a three-way valve, which includes one inlet and two outlets (i.e., a split-type three-way valve). The inlet is in communication with the outlet end of the main path 1, one of the two outlets of the three-way valve is in communication with the inlet end of the first branch path 2, and the other outlet is in communication with the inlet end of the second branch path 3 (as shown in Figures 1 to 4As shown in FIG. 1, the outlet end of the first branch 2 and the outlet end of the second branch 3 are both in communication with the inlet end of the main path 1; or, the regulating valve 7 is a three-way valve, the three-way valve includes one outlet and two inlets (i.e., a confluence type three-way valve), the outlet is in communication with the inlet end of the main path 1, one of the two inlets of the three-way valve is in communication with the outlet end of the first branch 2, and the other inlet is in communication with the outlet end of the second branch 3 (as shown in FIG. 2); or, the regulating valve 7 is a three-way valve, the three-way valve includes one outlet and two inlets (i.e., a confluence type three-way valve), the outlet is in communication with the outlet end of the main path 1, one of the two inlets of the three-way valve is in communication with the inlet end of the first branch 2, and the other inlet is in communication with the inlet end of the second branch 3 (as shown in FIG. 3). Figure 6 As shown in FIG. 1, the outlet end of the first branch 2 and the outlet end of the second branch 3 are both in communication with the inlet end of the main path 1; or, the regulating valve 7 is a three-way valve, the three-way valve includes one outlet and two inlets (i.e., a confluence type three-way valve), the outlet is in communication with the inlet end of the main path 1, one of the two inlets of the three-way valve is in communication with the outlet end of the first branch 2, and the other inlet is in communication with the outlet end of the second branch 3 (as shown in FIG. 2); or, the regulating valve 7 is a three-way valve, the three-way valve includes one outlet and two inlets (i.e., a confluence type three-way valve), the outlet is in communication with the outlet end of the main path 1, one of the two inlets of the three-way valve is in communication with the inlet end of the first branch 2, and the other inlet is in communication with the inlet end of the second branch 3 (as shown in FIG. 3).

[0028] Further, please refer again to Figures 1 to 6 The charging pile heat exchange system includes a first fan 8 and a second fan 9, the first fan 8 is located beside the second heat exchanger 21, the first fan 8 is configured to dissipate heat for the second heat exchanger 21, the first fan 8 is electrically connected with the control unit 5, the first fan 8 is in communication with the external natural environment, when the cold carrier partially or entirely flows through the first branch 2, the first fan 8 makes the air in the natural environment continuously enter the fins or fins between the second heat exchanger 21 to exchange heat, so that the temperature of the cold carrier flowing through the second heat exchanger 21 is lowered. The second fan 9 is located beside the third heat exchanger 63, the second fan 9 is configured to dissipate heat for the third heat exchanger 63, the second fan 9 is electrically connected with the control unit 5, when the cold carrier partially or entirely flows through the second branch 3, the second fan 9 makes the air continuously enter the fins or fins between the third heat exchanger 63 to exchange heat, and take away the heat emitted by the refrigerant flowing through the third heat exchanger 63. Further, the first fan 8 and the second fan 9 are both in communication with the external environment, and the first fan 8 and the second fan 9 both adopt variable speed and frequency fans, and the heat dissipation demand of different loads generated during the charging of the super charging pile is met by the variable speed and frequency of the fans.

[0029] The relationship between the ambient temperature and the flow of the cold carrier into the second branch 3 is explained below by way of example.

[0030] The value of the ambient temperature is set as T, when the ambient temperature T is less than or equal to the set temperature T1 (i.e., T≤T1), the control unit 5 controls the regulating valve 7 to guide the cold carrier in the main path 1 to enter the first branch 2 and not to enter the second branch 3, and the compressor 62 does not need to be started, thereby saving energy, wherein the set temperature T0 is the freezing point temperature of the cold carrier, and T1=(10±3)℃. When the ambient temperature is low, the first fan 8 does not need to be started to meet the heat dissipation demand, the first fan 8 does not need to be started, and the energy saving effect is further enhanced.

[0031] When the ambient temperature T is greater than the set temperature T1 and less than or equal to the set temperature T3 (i.e. T1 < T ≤ T3), the control unit 5 controls the regulating valve 7 to guide x% of the flow of the refrigerant in the main branch 1 into the second branch 3, where 20 ≤ x ≤ 75, T3 = (30 ± 3) °C. More specifically, when the ambient temperature T is greater than the set temperature T1 and less than or equal to the set temperature T2 (i.e. T1 < T ≤ T2), the control unit 5 controls the regulating valve 7 to guide x' % of the flow of the refrigerant in the main branch 1 into the second branch 3, where 20 ≤ x' < 50; when the ambient temperature T is greater than the set temperature T2 and less than or equal to the set temperature T3 (i.e. T2 < T ≤ T3), the control unit 5 controls the regulating valve 7 to guide x" % of the flow of the refrigerant in the main branch 1 into the second branch 3, where 50 ≤ x" ≤ 75, T2 = (20 ± 3) °C.

[0032] When the ambient temperature T is greater than the set temperature T3 (i.e. T > T3), the control unit 5 controls the regulating valve 7 to guide y% of the flow of the refrigerant in the main branch 1 into the second branch 3, where 75 < y ≤ 100.

[0033] In the present embodiment, the flow of the refrigerant into the second branch 3 is directly proportional to the ambient temperature T monitored by the ambient temperature sensor 4, i.e. the higher the monitored ambient temperature, the greater the flow of the refrigerant into the second branch 3,

[0034] In each of the above temperature ranges, the T is directly proportional to the speed of the fan, i.e. the control unit 5 can also select the speed of the corresponding fan according to the monitored ambient temperature T to meet the heat dissipation requirements of different loads of the charging pile in different temperature ranges through the variable speed and frequency of the fan.

[0035] In the present embodiment, the ambient temperature sensor 4 can monitor the ambient temperature T outside the charging pile shell 100 in real time, and the control unit 5 adjusts or keeps the current flow of each branch unchanged according to the monitored ambient temperature T; the ambient temperature sensor 4 can also monitor once every interval t, and the control unit 5 adjusts or keeps the current flow of each branch unchanged according to the monitored ambient temperature T, where 0.5h ≤ t ≤ 2h, such as t being 0.5h, 1h, 1.5h, 2h, etc.

[0036] To avoid freezing of the refrigerant in extremely cold weather environments, such as Figures 1 to 6As shown, at least one of the main path 1, the first branch path 2 and the second branch path 3 comprises a heating unit 17, the heating unit 17 is electrically connected with the control unit 5, the heating unit 17 is in series with the first heat exchanger 11, when the ambient temperature T is less than or equal to the set temperature T0 (i.e. T≤T0), the control unit 5 controls the heating unit 17 to heat the cold carrier flowing through the heating unit 17, and the cold carrier is heated to be higher than T0, for example, higher than T0 by 1-3 degrees Celsius. Wherein, T0 is the freezing point temperature of the cold carrier, and the heating unit 17 can play the role of anti-freezing of the cold carrier.

[0037] In order to avoid freezing of the cold carrier in extremely cold weather environment, the charging pile heat exchange system provided by the embodiment can also adopt the following mode. As shown in Figure 7 and Figure 8 As shown, the refrigeration circuit 6 comprises a four-way valve 60, the four-way valve 60 is electrically connected with the control unit 5, the four-way valve 60 is configured to control the flow direction of the refrigerant in the second heat exchange part 61 and the third heat exchanger 63, when the ambient temperature is less than or equal to the set temperature T0, the outlet end of the compressor 62 is communicated with the inlet end of the second heat exchange part 61 through the four-way valve 60, and the outlet end of the third heat exchanger 63 is communicated with the inlet end of the compressor 62 through the four-way valve 60. In extremely cold environment, the cold carrier is prone to freezing, at this time, the four-way valve 60 is configured to control the refrigerant to flow from the second heat exchange part 61 to the third heat exchanger 63 (as shown in Figure 7 ), specifically, the high-pressure refrigerant discharged from the compressor 62 flows to the second heat exchange part 61 after passing through the four-way valve 60 (at this time, the second heat exchange part 61 acts as a condenser), the refrigerant releases heat, at this time, the cold carrier in the main path 1 flows to the first heat exchange part 31 entirely or partially, so that the cold carrier absorbs heat when flowing through the first heat exchange part 31, preventing the cold carrier from freezing, and the refrigerant releasing heat enters the third heat exchanger 63 (at this time, the third heat exchanger 63 acts as an evaporator), the refrigerant absorbs heat, and then flows to the compressor 62 through the four-way valve 60. In non-extremely cold environment and when the cold carrier enters the second branch path 3, as shown in Figure 8 , the high-pressure refrigerant discharged from the compressor 62 flows to the third heat exchanger 63 after passing through the four-way valve 60 (at this time, the third heat exchanger 63 acts as a condenser), the refrigerant releases heat and then enters the second heat exchange part 61 (at this time, the second heat exchange part 61 acts as an evaporator), the refrigerant absorbs heat, and then flows to the compressor 62 through the four-way valve 60. By setting the four-way valve 60 to control the flow direction of the refrigerant in the second heat exchange part 61 and the third heat exchanger 63, the embodiment can realize the switching of the functions of heat dissipation and anti-freezing, and can replace the heating unit 17 to reduce energy consumption. In other embodiments, both the heating unit 17 and the four-way valve 60 can be provided, so that when one of them fails, the other can ensure the stable operation of the system and prevent the cold carrier from freezing to cause the explosion and damage of components, pipelines and the like.

[0038] In this embodiment, the freezing point of the secondary refrigerant is lower than the minimum temperature at which the power module operates. When the ambient temperature monitored by the ambient temperature sensor 4 is lower than the freezing point of the secondary refrigerant but higher than the minimum temperature at which the power module operates, the operating temperature of the power module can be maintained within the normal operating temperature range by heating the power module as described above, and the secondary refrigerant can be heated to a temperature higher than the minimum temperature at which the power module operates. In other embodiments, the freezing point of the secondary refrigerant can be higher than the minimum temperature at which the power module operates, for example, 1-3 ° higher than the minimum temperature at which the power module operates. When the secondary refrigerant is heated to prevent freezing, the heating is performed within the normal operating temperature range of the power module.

[0039] In this embodiment, the second heat exchanger 21 is used for heat exchange between the secondary refrigerant and air, and the third heat exchanger 63 is used for heat exchange between the refrigerant and air. The second heat exchanger 21 and the third heat exchanger 63 can be micro-channel heat exchangers, which have small volume, low air resistance, and high heat exchange efficiency. Of course, the second heat exchanger 21 and the third heat exchanger 63 can also be copper tube fin heat exchangers. In addition, the charging pile heat exchange system includes a fourth heat exchanger, which includes a first heat exchange portion 31 and a second heat exchange portion 61. The fourth heat exchanger is used for heat exchange between the secondary refrigerant and the refrigerant. The first heat exchange portion 31 is used for circulation of the secondary refrigerant, and the second heat exchange portion 61 is used for circulation of the refrigerant. In other words, part of the fourth heat exchanger is used as part of the second branch 3 for circulation of the secondary refrigerant, and the other part is used as part of the refrigeration circuit 6 for circulation of the refrigerant. The fourth heat exchanger can be a plate heat exchanger, which includes a plurality of heat exchange plates stacked together. Adjacent plates have channels therebetween. One of the channels is used for circulation of the secondary refrigerant (the heat exchange plates on both sides of the channel are combined to form the first heat exchange portion 31), and the other channel is used for circulation of the refrigerant (the heat exchange plates on both sides of the channel are combined to form the second heat exchange portion 61). Of course, the fourth heat exchanger can also be a double-pipe heat exchanger.

[0040] In the above embodiments, the connections between the components in the main circuit 1, the first branch circuit 2, the second branch circuit 3, the refrigeration circuit 6, and the connections between the corresponding components and the regulating valve 7 can be connected by pipelines; can also be connected directly by joints on the components to achieve integration; can also be connected by pipelines between some components and connected by joints on the components between some components. The cold carrier is mixed by ethylene glycol and water in a certain proportion, such as ethylene glycol and water mixed in a ratio of 1:1. When the seasons change and the ambient temperature changes greatly, the density of the cold carrier will also change, causing the volume to expand and shrink. The charging pile heat exchange system includes an expansion tank 14 connected to the main circuit 1. The access end 141 of the expansion tank 14 is close to the inlet end of the liquid pump 10. When the volume of the cold carrier expands, the excess cold carrier in the flow path enters the expansion tank 14 for storage, avoiding the occurrence of bursting of components, pipelines, etc. due to the volume expansion of the cold carrier, and improving safety. When the volume of the cold carrier shrinks, the cold carrier in the expansion tank 14 can be supplemented to the flow path for work. In other embodiments, the concentration of the cold carrier can also be adjusted according to needs.

[0041] Please refer again to Figures 1 to 8 The charging pile heat exchange system further includes a water supplementing and draining branch circuit 15. One end of the water supplementing and draining branch circuit 15 is externally provided in the main circuit 1. The access end of the water supplementing and draining branch circuit 15 is located between the outlet end of the expansion tank 14 and the access end 141 of the expansion tank 14. After the system components are connected and installed, sufficient cold carrier is filled through the water supplementing and draining branch circuit 15, or when the cold carrier in the flow path is lost or leaks, the water supplementing and draining branch circuit 15 is used for supplementing. In addition, the main circuit 1 includes a first filter 16 connected in series with the first heat exchanger 11. The first filter 16 is located between the outlet end of the liquid pump 10 and the first heat exchanger 11. The first filter 16 is used to filter impurities in the cold carrier, avoiding blockage due to impurities, and improving the working reliability of the charging pile heat exchange system. The water supplementing and draining branch circuit 15 is also provided with a stop valve 151 for controlling the on-off of the water supplementing and draining branch circuit 15. When the stop valve 151 is opened, the cold carrier can pass through, and when the stop valve 151 is closed, the cold carrier cannot pass through. When there is too much cold carrier in the main circuit 1, the excess cold carrier can be discharged through the water supplementing and draining branch circuit 15, or when the cold carrier freezes in extremely cold weather, the cold carrier in the main circuit 1 and the first branch circuit 2 and the second branch circuit 3 is emptied through the water supplementing and draining branch circuit 15 to prevent the problem of bursting of the main circuit 1, the first branch circuit 2 and the second branch circuit 3 due to the expansion of the cold carrier.

[0042] In the above embodiment, the charging pile heat exchange system comprises a first temperature sensor 12 and a second temperature sensor 13, both of which are located in the charging pile shell 100, the first temperature sensor 12 is arranged near the inlet end of the first heat exchanger 11, the first temperature sensor 12 is configured to monitor the inlet temperature of the first heat exchanger 11, the first temperature sensor 12 is electrically connected with the control unit 5, the second temperature sensor 13 is arranged near the outlet end of the first heat exchanger 11, the second temperature sensor 13 is configured to monitor the outlet temperature of the first heat exchanger 11, and the second temperature sensor 13 is electrically connected with the control unit 5. When the inlet temperature monitored by the first temperature sensor 12 is similar to or the same as the outlet temperature monitored by the second temperature sensor 13, it indicates that there may be a fault in the first branch 2, the second branch 3 and the refrigeration circuit 6, and the control unit 5 sends a signal to prompt timely repair.

[0043] Please refer again to Figures 1 to 8In the above embodiment, the first heat exchanger 11 is provided in multiple, the first heat exchangers 11 are connected in parallel, the first heat exchangers 11 are arranged in double rows along the horizontal direction in the charging pile shell 100, and the first heat exchangers 11 in each row are arranged at equal intervals along the longitudinal direction of the charging pile shell 100. The number of the first heat exchangers 11 corresponds to the number of the power modules, and the first heat exchanger 11 corresponds to the power module one by one. In this embodiment, the branch flow passages of each first heat exchanger 11 are arranged in the same way by arranging the first heat exchangers 11 at equal intervals in the longitudinal direction, so that the resistance of each branch is the same and the flow distribution is uniform, thereby ensuring that each first heat exchanger 11 provides effective heat dissipation for the power module. Further, the charging pile shell 100 has a cavity 101, the cavity 101 is isolated from the natural environment, and the first heat exchanger 11 and the power module are located in the cavity 101. Since the power module is an electronic component, arranging the power module and the first heat exchanger 11 in the cavity 101 isolated from the natural environment can effectively protect the power module from the influence of water vapor, dust and other factors in the natural environment, thereby effectively protecting the power module to prolong its service life. Among them, the first heat exchanger 11 adopts a liquid cooling plate, the power module is in contact with the corresponding first heat exchanger 11, so that the heat generated by the power module can be transferred to the coolant in the liquid cooling plate, and at the same time the cooling capacity of the coolant in the liquid cooling plate can also be transferred to the power module to cool it down, thereby ensuring the normal and safe operation of the power module, and the coolant in the liquid cooling plate can also reduce the temperature of the environment in the cavity 101. In this embodiment, the main circuit 1 further comprises a ball valve 110, at least one of the inlet end and the outlet end of each first heat exchanger 11 is provided with a ball valve 110, and the flow entering the first heat exchanger 11 can be adjusted through the ball valve 110. The larger the opening of the ball valve 110, the greater the flow of the coolant entering the corresponding first heat exchanger 11, and vice versa. The smaller the opening of the ball valve 110, the smaller the flow. The flow of the coolant circulating in the corresponding first heat exchanger 11 can be adjusted according to the power of the power module, and the adjustment is strong, so as to ensure that each power module can be effectively cooled. In this embodiment, the cavity 101 isolated from the natural environment does not mean complete isolation. Since the connecting pipeline wiring or the connecting joint needs to pass through the perforation, and the charging pile shell 100 necessarily has a window that can be opened to facilitate maintenance or replacement of the power module, there is a certain gap.

[0044] In addition, air is mixed into the coolant during circulation, which reduces its cooling effect. Therefore, the main circuit 1 further comprises an exhaust valve 19 connected in series with the first heat exchanger 11, the liquid pump 10, etc. The air can be discharged in time through the exhaust valve 19.

[0045] In order to ensure that the secondary refrigerant circulates at a proper pressure, the charging pile heat exchange system of the embodiment further comprises a pressure sensor 18 arranged near the outlet end of the liquid pump 10 to monitor the outlet liquid pressure of the liquid pump 10, so as to avoid that the secondary refrigerant flows too fast to cause the secondary refrigerant in the first heat exchanger 11 to not be fully exchanged with the power module, and at the same time, prevent the secondary refrigerant from flowing too slowly to cause the secondary refrigerant in the first heat exchanger 11 to not effectively absorb the heat generated by the power module.

[0046] In the embodiment, the refrigeration circuit 6 comprises an electronic expansion valve 64 connected in series with the third heat exchanger 63, and the electronic expansion valve 64 is arranged between the second heat exchange part 61 and the third heat exchanger 63. The electronic expansion valve 64 is electrically connected with the control unit 5. The high-pressure refrigerant liquid from the third heat exchanger 63 is sprayed into the second heat exchange part 61 after being throttled and depressurized by the electronic expansion valve 64. The refrigeration circuit 6 further comprises a drying filter 65 connected in series with the third heat exchanger 63, and the drying filter 65 is arranged between the electronic expansion valve 64 and the third heat exchanger 63. The drying filter 65 can filter out sundries such as metal shavings, various oxides and dust in the refrigerant, so as to prevent the sundries from blocking the capillary tube in the refrigeration system or damaging the compressor, and can also absorb the residual water in the refrigeration system to prevent ice blockage and reduce the corrosion of water to the refrigeration system.

[0047] In the above embodiment, the refrigeration circuit 6 further comprises a high-pressure switch 66 connected in series with the compressor 62, and the high-pressure switch 66 is arranged near the outlet end of the compressor 62. The refrigeration circuit 6 further comprises an exhaust pressure sensor 67 and an exhaust temperature sensor 68 arranged between the outlet end of the compressor 62 and the third heat exchanger 63. The exhaust pressure sensor 67 is used to monitor the exhaust pressure of the compressor 62. The high-pressure switch 66, the exhaust pressure sensor 67 and the exhaust temperature sensor 68 are electrically connected with the control unit 5. When the third heat exchanger 63 is seriously dirty and blocked, the second fan 9 is faulty, the cooling air volume is insufficient, the refrigerant is excessive, or air or other non-condensed gas is mixed in the system, the exhaust pressure will be too high, which reduces the working efficiency and seriously damages the compressor 62. When the exhaust pressure sensor 67 monitors that the exhaust pressure is too high, the control unit 5 can control the high-pressure switch 66 to be disconnected according to the signal of the too high exhaust pressure, so as to stop the compressor 62, thereby playing a protection role. The exhaust temperature sensor 68 monitors the exhaust temperature of the compressor 62, so as to determine the opening degree of the electronic expansion valve 64, thereby controlling the operating speed of the compressor 62 and ensuring that the exhaust temperature is not too high. The refrigeration circuit 6 further comprises an inlet pressure sensor and an inlet temperature sensor 69 arranged near the inlet end of the compressor 62, which are respectively used to monitor the inlet pressure and the inlet temperature of the compressor 62. The inlet pressure sensor and the inlet temperature sensor 69 are electrically connected with the control unit 5.

[0048] The charging pile heat exchange system provided by the embodiment can regulate the flow of the cold carrier into the first branch and / or the second branch configured by the refrigeration circuit to reduce the temperature according to the ambient temperature in the heat exchange working state, uses the natural cooling and compression cycle refrigeration combination to radiate the power module of the super charging pile, can effectively use the environmental cold source, is relatively energy-saving in winter and spring and autumn, has better radiating effect in combination with the refrigeration mode in the extremely hot summer, and has more guaranteed refrigeration effect than the pure natural cooling mode. Since part of the compression cycle refrigeration is used, the third heat exchanger has a small volume, and because the heat exchange temperature difference is large, the third heat exchanger has a small air volume demand, can effectively reduce the operation noise of the second fan, and has a high energy efficiency ratio.

[0049] Part of the technical implementation manners in the above embodiments can be combined or replaced.

[0050] The above embodiments are only used for describing the present application and not limiting the technical solutions described in the present application. The understanding of the specification should be based on the technical personnel in the technical field, for example, the directional description such as “front”, “back”, “left”, “right”, “up”, “down” and the like is only used for describing the relationship between objects, and is not substantially limited. “Multiple” refers to at least two or more.

[0051] Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical personnel in the technical field can still modify or equivalently replace the present application, and all technical solutions and improvements which do not deviate from the spirit and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. A charging pile heat exchange system for heat exchange of a power module in a charging pile shell, characterized in that, The charging pile heat exchange system comprises a flow path, an ambient temperature sensor and a control unit, the ambient temperature sensor is at least partially arranged outside the charging pile shell, and the ambient temperature sensor is electrically connected with the control unit. The flow path comprises a main path, a first branch path, a second branch path and a refrigeration circuit, the main path comprises a liquid pump and a first heat exchanger, the liquid pump and the first heat exchanger are connected in series, the first branch path is connected in series with the main path, the first branch path comprises a second heat exchanger, the second branch path is connected in series with the main path, the second branch path comprises a first heat exchange part, the first branch path and the second branch path are connected in parallel, the refrigeration circuit comprises a second heat exchange part, a compressor and a third heat exchanger, the second heat exchange part, the compressor and the third heat exchanger are connected in series, and the second heat exchange part is configured to exchange heat with the first heat exchange part. The charging pile heat exchange system comprises an adjusting valve, at least one of the first branch path and the second branch path is provided with the adjusting valve, or the first branch path, the second branch path and the main path have two connecting positions, and at least one of the connecting positions is provided with the adjusting valve, and the adjusting valve is electrically connected with the control unit. The charging pile heat exchange system has a heat exchange working state, in the heat exchange working state, the main path, the first branch path and the second branch path circulate the cooling medium, the refrigeration circuit circulates the refrigerant, the first heat exchanger exchanges heat with the power module, and the control unit controls the adjusting valve to adjust the flow of the cooling medium entering the first branch path and / or the second branch path according to the ambient temperature monitored by the ambient temperature sensor. In the heat exchange working state, when the ambient temperature monitored by the ambient temperature sensor is less than or equal to a set temperature T1, the control unit controls the adjusting valve to guide the cooling medium in the main path to enter the first branch path. When the ambient temperature monitored by the ambient temperature sensor is greater than the set temperature T1 and less than or equal to a set temperature T3, the control unit controls the adjusting valve to guide x% flow of the cooling medium in the main path to enter the second branch path; when the ambient temperature monitored by the ambient temperature sensor is greater than the set temperature T3, the control unit controls the adjusting valve to guide y% flow of the cooling medium in the main path to enter the second branch path, wherein the flow of the cooling medium entering the second branch path is proportional to the ambient temperature monitored by the ambient temperature sensor.

2. The charging pile heat exchange system according to claim 1, characterized in that, 20≤x≤75; 75 3. The charging pile heat exchange system according to claim 2, characterized in that, In the heat exchange working state, when the ambient temperature monitored by the ambient temperature sensor is greater than the set temperature T1 and less than or equal to a set temperature T2, the control unit controls the adjusting valve to guide x'% flow of the cooling medium in the main path to enter the second branch path, wherein 20≤x'<50; when the ambient temperature monitored by the ambient temperature sensor is greater than the set temperature T2 and less than or equal to the set temperature T3, the control unit controls the adjusting valve to guide x''% flow of the cooling medium in the main path to enter the second branch path, wherein 50≤x''≤75; Wherein, T2=(20±3)℃.

4. The charging pile heat exchange system according to claim 2, characterized in that, At least one of the first branch, the second branch and the main line comprises a heating unit, the heating unit is in series with the first heat exchanger, and the heating unit is electrically connected with the control unit; in the heat exchange working state, when the ambient temperature is less than or equal to the set temperature T0, the control unit controls the heating unit to heat the cold carrier flowing through the heating unit; And / or, the refrigeration circuit comprises a four-way valve, the four-way valve is electrically connected with the control unit, in the heat exchange working state, when the ambient temperature is less than or equal to the set temperature T0, the outlet end of the compressor is communicated with the inlet end of the second heat exchange part through the four-way valve, and the outlet end of the third heat exchanger is communicated with the inlet end of the compressor through the four-way valve. Wherein, the set temperature T0 is the freezing point temperature of the cold carrier.

5. The charging pile heat exchange system according to claim 1, characterized in that, The charging pile heat exchange system comprises a fourth heat exchanger, the fourth heat exchanger comprises the first heat exchange part and the second heat exchange part, the fourth heat exchanger is used for heat exchange between the cold carrier and the refrigerant, the first heat exchange part is used for the flow of the cold carrier, and the second heat exchange part is used for the flow of the refrigerant. The charging pile heat exchange system comprises a first fan, the first fan is located beside the second heat exchanger, the first fan is configured to dissipate heat for the second heat exchanger, and the first fan is electrically connected with the control unit. The charging pile heat exchange system comprises a second fan, the second fan is located beside the third heat exchanger, the second fan is configured to dissipate heat for the third heat exchanger, and the second fan is electrically connected with the control unit; the liquid pump is electrically connected with the control unit, and the compressor is electrically connected with the control unit.

6. The charging pile heat exchange system according to claim 1, characterized in that, The charging pile heat exchange system comprises a first temperature sensor, the first temperature sensor is arranged close to the inlet end of the first heat exchanger, the first temperature sensor is configured to monitor the inlet temperature of the first heat exchanger, and the first temperature sensor is electrically connected with the control unit. The charging pile heat exchange system comprises a second temperature sensor, the second temperature sensor is arranged close to the outlet end of the first heat exchanger, the second temperature sensor is configured to monitor the outlet temperature of the first heat exchanger, and the second temperature sensor is electrically connected with the control unit.

7. The charging pile heat exchange system according to claim 1, characterized in that, The charging pile heat exchange system comprises an expansion tank, the expansion tank is connected with the main line, the access end of the expansion tank is close to the inlet end of the liquid pump, the charging pile heat exchange system further comprises a water supplementing and discharging branch, one end of the water supplementing and discharging branch is externally connected with the main line, and the access end of the water supplementing and discharging branch is located between the outlet end of the expansion tank and the access end of the expansion tank. The main line comprises a first filter, the first filter is in series with the first heat exchanger, and the first filter is located between the outlet end of the liquid pump and the first heat exchanger.

8. The charging pile heat exchange system according to any one of claims 1 to 7, characterized in that, The first heat exchanger has a plurality of first heat exchangers, the first heat exchangers are arranged in parallel, the first heat exchangers are arranged in double rows along the horizontal direction in the charging pile shell, and each row of first heat exchangers is arranged at equal intervals along the longitudinal direction of the charging pile shell.

9. The charging pile heat exchange system according to any one of claims 1 to 7, characterized in that, The adjusting valve is a two-way valve, and at least one of the first branch and the second branch is provided with the two-way valve. Alternatively, the regulating valve is a three-way valve, the three-way valve comprising one inlet and two outlets, the inlet being in communication with the outlet end of the main path, one of the two outlets of the three-way valve being in communication with the inlet end of the first branch path, and the other outlet being in communication with the inlet end of the second branch path. Alternatively, the regulating valve is a three-way valve, the three-way valve comprising one inlet and two outlets, the inlet being in communication with the outlet end of the main path, one of the two outlets of the three-way valve being in communication with the inlet end of the first branch path, and the other outlet being in communication with the inlet end of the second branch path.

10. The charging pile heat exchange system according to any one of claims 1 to 7, characterized in that, The refrigeration circuit comprises an electronic expansion valve, the electronic expansion valve being in series with the third heat exchanger, and the electronic expansion valve being located between the second heat exchange portion and the third heat exchanger. The refrigeration circuit further comprises a drying filter, the drying filter being in series with the third heat exchanger, and the drying filter being located between the electronic expansion valve and the third heat exchanger.

Images