An evaporation unit and thermal management system

Abstract

The application discloses an evaporation unit and a heat management system, which comprise a first heat exchange part, a second heat exchange part, an expansion valve and a connecting part, the first heat exchange part has a first heat exchange channel, the second heat exchange part has a second heat exchange channel and a third heat exchange channel, refrigerant in the second heat exchange channel can exchange heat with refrigerant in the third heat exchange channel, a refrigerant outlet of the expansion valve is communicated with the first heat exchange channel, and the first heat exchange channel is communicated with the third heat exchange channel, so that the evaporation outlet temperature of refrigerant at the outlet of the evaporation unit is improved, and the refrigeration efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration. Background Art

[0002] The refrigeration system generally includes a compressor, a condenser, an evaporator, and a throttling element. After being compressed and expanded by the compressor, the refrigerant enters the condenser, where it releases heat and cools down. The refrigerant drops to a certain temperature, then enters the throttling element for throttling and pressure reduction, then enters the evaporator to absorb heat and heat up, and then enters the compressor, and so on.

[0003] In an automotive thermal management system, cooling and heating the vehicle cabin are achieved through phase changes in the refrigerant. Considering that the gaseous refrigerant evaporated from the evaporator must return to the compressor, and the refrigerant in the automotive thermal management system is in a dynamic regulation process, in some special cases, the expansion valve opening may be too large, resulting in insufficient superheat in the evaporator. In this case, a small amount of liquid refrigerant will evaporate from the evaporator. If this liquid refrigerant is not treated and directly drawn into the compressor, it can easily cause compressor liquid shock. Summary of the Invention

[0004] An object of the present invention is to provide an evaporation unit with a compact structure and capable of increasing the temperature of the refrigerant after flowing out of an evaporation outlet, and a thermal management system having the evaporation unit.

[0005] In order to achieve the above purpose, the following technical solutions are adopted:

[0006] An evaporation unit includes a first heat exchange portion, an expansion valve, a second heat exchange portion and a connecting component, the first heat exchange portion includes a core formed by stacking plates, the second heat exchange portion includes a core formed by stacking plates, the first heat exchange portion includes a bottom and a top along the stacking direction of the plates of the first heat exchange portion, the second heat exchange portion includes a bottom and a top along the stacking direction of the plates of the second heat exchange portion, the connecting component has a first side portion and a second side portion, the first side portion of the connecting component is fixed to the bottom of the first heat exchange portion, and the second side portion of the connecting component is fixed to the bottom of the second heat exchange portion; the expansion valve is fixed to the connecting component The first heat exchange portion includes at least a first heat exchange channel, the second heat exchange portion includes at least a second heat exchange channel and a third heat exchange channel, the evaporation unit includes a refrigerant flow channel, the refrigerant flow channel includes the first heat exchange channel, the second heat exchange channel, and the third heat exchange channel, the connecting component includes a first connecting channel and a second connecting channel, the expansion valve includes a refrigerant inlet and a refrigerant outlet, the first connecting channel connects the second heat exchange channel and the refrigerant inlet, the second connecting channel connects the refrigerant outlet and the first port of the first heat exchange channel, and the second port of the first heat exchange channel is connected to the third heat exchange channel.

[0007] In order to achieve the above purpose, the following technical solutions are also adopted:

[0008] A thermal management system comprising a compressor and a condenser, characterized in that it includes the evaporation unit described in the above technical solution, the evaporation unit is located downstream of the condenser, the evaporation unit includes an inlet of a refrigerant flow channel and an outlet of the refrigerant flow channel, the inlet of the refrigerant flow channel is connected to the downstream of the condenser, and the outlet of the refrigerant flow channel is connected to the inlet of the compressor;

[0009] The fluid in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel of the evaporation unit is refrigerant, the second port of the second heat exchange channel is the inlet of the refrigerant flow channel, and the second port of the third heat exchange channel is the outlet of the refrigerant flow channel; after the condenser exchanges heat and cools down the temperature, the refrigerant enters the second heat exchange channel through the inlet of the refrigerant flow channel, and after heat exchange in the second heat exchange part, enters the refrigerant inlet of the expansion valve, and enters the first heat exchange channel from the refrigerant outlet of the expansion valve. After the refrigerant evaporates and absorbs heat in the first heat exchange channel, it enters the third heat exchange channel. The refrigerant in the third heat exchange channel absorbs the heat of the refrigerant in the second heat exchange channel and leaves from the outlet of the refrigerant flow channel. The refrigerant temperature at the second port of the third heat exchange channel is higher than the refrigerant temperature at the second port of the first heat exchange channel.

[0010] The above-mentioned technical solution of the present invention includes a first heat exchange unit, a second heat exchange unit, a connecting component, and an expansion valve. The first heat exchange unit has a first heat exchange channel, and the second heat exchange unit has a second heat exchange channel and a third heat exchange channel. The refrigerant in the second heat exchange channel can exchange heat with the refrigerant in the third heat exchange channel. The refrigerant outlet of the expansion valve is connected to the first heat exchange channel, and the first heat exchange channel is connected to the third heat exchange channel. In this way, when the refrigerant passes through the evaporation unit, it undergoes a heat exchange in the first heat exchange unit and is heated. Then, it undergoes a second heat exchange with the pre-throttling refrigerant in the second heat exchange unit and is heated. This can achieve further superheated evaporation of the refrigerant and reduce the risk of liquid hammer caused by liquid refrigerant entering the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic structural diagram of an embodiment of the present invention;

[0012] Figure 2 for Figure 1 A partially exploded perspective view of the structure shown;

[0013] Figure 3 for Figure 1 A partially exploded perspective view of the structure shown from another perspective;

[0014] Figure 4 for Figure 1 A front view of the structure shown;

[0015] Figure 5 for Figure 4 Schematic cross-section of the middle DD line;

[0016] Figure 6 for Figure 4 Schematic diagram of the cross section of the middle II line;

[0017] Figure 7 for Figure 4 Schematic cross-section of the mid-NN line;

[0018] Figure 8 for Figure 4 Schematic cross-section of the OO line;

[0019] Figure 9 Figure 1 A schematic diagram of the three-dimensional structure of the connecting parts from one perspective;

[0020] Figure 10 for Figure 1 A schematic diagram of the three-dimensional structure of the connecting component from another perspective;

[0021] Figure 11 It is a structural schematic diagram of another embodiment of the present invention;

[0022] Figure 12 for Figure 11 A partially exploded perspective view of the structure shown;

[0023] Figure 13 It is a structural schematic diagram of another embodiment of the present invention;

[0024] Figure 14 for Figure 13 A partially exploded perspective view of the structure shown;

[0025] Figure 15 This is a schematic exploded perspective view of another embodiment of the present invention;

[0026] Figure 16 FIG. 4 is a simple schematic diagram of the thermal management system of the present invention. DETAILED DESCRIPTION

[0027] Reference Figures 1-10 The figure schematically shows an evaporation unit 100, which includes a first heat exchange part 11, an expansion valve 13, a second heat exchange part 12 and a connecting component 14. The first heat exchange part 11 is fixed to the connecting component 14, and the second heat exchange part 12 is fixed to the connecting component 14.

[0028] The first heat exchange section 11 includes a core formed by stacked plates, and the second heat exchange section 12 includes a core formed by stacked plates. The first heat exchange section 11 has at least two fluid channels, and the second heat exchange section 12 has at least two fluid channels. The plates of the first heat exchange section 11, for example, include plates with four corner holes, and the plates of the second heat exchange section 12, for example, include plates with four corner holes. The first and second heat exchange sections may also have three or more fluid channels, depending on the situation.

[0029] The evaporation unit 100 has a refrigerant flow channel 15; the first heat exchange part 11 includes at least a first heat exchange channel 111, and the second heat exchange part 12 has at least a second heat exchange channel 121 and a third heat exchange channel 122. The refrigerant flow channel 15 includes the first heat exchange channel 111, the second heat exchange channel 121, and the third heat exchange channel 122, that is, refrigerant flows in the first heat exchange channel 111, the second heat exchange channel 121, and the third heat exchange channel 122, but the temperatures of the refrigerant flowing in the first heat exchange channel 111, the second heat exchange channel 121, and the third heat exchange channel 122 will be different.

[0030] The first heat exchange portion 11 includes a bottom 112 and a top along the direction in which the plates of the first heat exchange portion 11 are stacked. The second heat exchange portion 12 includes a bottom and a top along the direction in which the plates of the second heat exchange portion 12 are stacked. The connecting component 14 is located between the first heat exchange portion 11 and the second heat exchange portion 12. The connecting component 14 has a first side portion 141, a second side portion 142, and a third side portion 143. The first side portion 141 is welded to the bottom 112 of the first heat exchange portion 11, and the second side portion 142 is welded to the bottom 128 of the second heat exchange portion 12. The expansion valve 13 is fixed to the connecting component 14; specifically, the expansion valve 13 is fixed to the third side portion 143. The expansion valve 13 protrudes from the connecting component 14 in a direction parallel to the plates of the first heat exchange portion 11.

[0031] The connecting component 14 has a first connecting channel 144 and a second connecting channel 145. The expansion valve 13 includes a refrigerant inlet 131 and a refrigerant outlet 132. The second port 124 of the second heat exchange channel 121 is the inlet of the refrigerant flow channel 15. The first port 123 of the second heat exchange channel 121 is connected to the first connecting channel 144. The first connecting channel 144 is connected to the refrigerant inlet 131 of the expansion valve 13. The refrigerant outlet 132 of the expansion valve 13 is connected to the second connecting channel 145. The second connecting channel 145 is connected to the first heat exchange channel 111. The first port 125 of the third heat exchange channel 122 is connected to the first heat exchange channel 111. The second port 126 of the third heat exchange channel 122 is the outlet of the refrigerant flow channel 15.

[0032] In this way, the refrigerant enters the evaporation unit 100 from the inlet of the refrigerant flow channel 15, enters the expansion valve 13 after heat exchange in the second heat exchange part 12, and then enters the first heat exchange part 11 for evaporation and superheating. After evaporation and superheating in the first heat exchange part 11, it can also enter the second heat exchange part 12 for further evaporation, which helps to increase the refrigerant temperature at the outlet of the evaporation unit 100, reduce the liquid refrigerant content at the outlet of the evaporation unit 100, and reduce the risk of liquid hammer caused by the compressor sucking in liquid refrigerant.

[0033] In addition, this solution takes into account the problem of superheat and integrates the first heat exchange part 11 formed by stacking plates, the second heat exchange part 12 also formed by stacking plates, and the expansion valve 13 to form an evaporation unit 100, so that the overall structure is compact and the flow path layout is simple.

[0034] In existing automotive thermal management systems, simply increasing the superheat to increase the evaporator's evaporation capacity will increase the load on the compressor, increase the system's energy input, and reduce the system's cooling efficiency to a certain extent. However, when the evaporator's evaporation capacity is slightly insufficient (i.e., when there is still some liquid refrigerant at the evaporator outlet), the superheated refrigerant evaporated through the first heat exchange section 11 by the evaporation unit 100 absorbs heat in the second heat exchange section 12, further increasing the superheat. While utilizing the energy of the evaporation unit 100 application system itself, this also increases the superheat at the evaporation unit 100 outlet, reduces the liquid refrigerant content, and improves the cooling efficiency of the evaporation unit 100 application system. Furthermore, the evaporation unit 100 outlet can be directly connected to the compressor inlet, eliminating the need for long piping for further evaporation. This reduces the need for redundant piping in system applications, reduces costs, and improves connection convenience. In addition, the refrigerant after evaporation and superheating in the first heat exchange part 11 exchanges heat with the refrigerant in the second heat exchange channel that is about to enter the second heat exchange part in the second heat exchange part, which can further reduce the supercooling of the refrigerant in the second heat exchange channel and improve the cooling efficiency of the system.

[0035] In this article, the connection between the third heat exchange channel 122 and the first heat exchange channel 111 does not only refer to the direct connection between the first heat exchange channel 111 and the third heat exchange channel 122, but also means that the third heat exchange channel 122 and the first heat exchange channel 111 can be connected through the connecting component 14 and the expansion valve 13. The same applies to the following.

[0036] The bottom 112 of the first heat exchange portion 11 has a first port 114 of the first heat exchange channel 111 , and the bottom 128 of the second heat exchange portion 12 has a first port 123 of the second heat exchange channel 121 ;

[0037] The first port 123 of the second heat exchange channel 121 is in communication with the first connecting channel 144 , and the second connecting channel 145 is in communication with the first port 114 of the first heat exchange channel 111 ;

[0038] The bottom 128 of the second heat exchange portion 12 has a first port 125 of the third heat exchange channel 122, and the bottom 112 of the first heat exchange portion 11 has a second port 115 of the first heat exchange channel 111. The first port 125 of the third heat exchange channel 122 is in communication with the second port 115 of the first heat exchange channel 111.

[0039] The inlet and outlet of the refrigerant flow channel 15 are located at the top 127 of the second heat exchange portion 12. The expansion valve 13 includes a reflux inlet 133 and a reflux outlet 134. The inlet of the refrigerant flow channel 15 is connected to the second heat exchange channel 121, the first connecting channel 144, the inlet of the expansion valve 13, the outlet of the expansion valve 13, the second connecting channel 145, the first heat exchange channel 111, the reflux inlet 133, the reflux outlet 134, the third heat exchange channel 122, and the outlet of the refrigerant flow channel 15.

[0040] Furthermore, the refrigerant temperature at the second port 126 of the third heat exchange channel 122 is higher than the refrigerant temperature at the second port 115 of the first heat exchange channel 111. The refrigerant evaporated in the first heat exchange portion 11 further evaporates and absorbs heat in the second heat exchange portion 12, which facilitates the subsequent direct connection of the evaporation unit 100 to the inlet of the compressor.

[0041] The expansion valve 13 is a thermal expansion valve 13, for example, and includes a refrigerant inlet 131 (i.e., the inlet of the expansion valve 13), a refrigerant outlet 132 (i.e., the outlet of the expansion valve 13), a backflow inlet 133, and a backflow outlet 134. When the refrigerant enters the evaporative unit 100 from the inlet of the refrigerant flow channel 15, it exchanges heat with the refrigerant at a different temperature in the second heat exchange passage 121 of the second heat exchange unit 12, and then enters the inlet of the expansion valve 13 from the first communication passage 144, is throttled and depressurized, and then enters the second communication passage 145 from the outlet of the expansion valve 13, enters the first heat exchange passage 111 of the first heat exchange unit 11, and is evaporated and absorbs heat in the first heat exchange passage 111. The refrigerant enters the third heat exchange passage 122 of the second heat exchange unit 12 from the backflow inlet 133 and the backflow outlet 134. Since the evaporative unit 100 is located downstream of the heat exchanger that functions as a condenser in the refrigeration system, the temperature of the refrigerant before entering the evaporative unit 100 is higher than that of the refrigerant after evaporating in the first heat exchange passage 111. Therefore, the refrigerant leaving the first heat exchange passage 111 can absorb heat from the refrigerant in the second heat exchange passage 121 in the third heat exchange passage 122, and is further evaporated into a superheated gas. In this way, the outlet of the refrigerant flow channel 15 connected to the system of the evaporative unit 100 can be directly communicated with the inlet passage of the compressor, facilitating the system connection of the evaporative unit 100 and the compressor. Meanwhile, the evaporative unit 100 has a small and compact structure, occupies a small space, and has fewer connection interfaces, facilitating connection in the system and easy installation.

[0042] The evaporative unit 100 has a cooling liquid passage 16, the first heat exchange unit 11 has a fourth heat exchange passage 116, the cooling liquid passage 16 includes the fourth heat exchange passage 116, and the second heat exchange unit 12 includes a cooling liquid inlet and a cooling liquid outlet, which are communicated with the fourth heat exchange passage 116.

[0043] The fluid flowing in the fourth heat exchange passage 116 is cooling liquid, which can be battery cooling liquid in a thermal management system. After the refrigerant is throttled and depressurized by the expansion valve 13, the refrigerant can absorb heat from the cooling liquid in the fourth heat exchange passage 116 to evaporate. In this way, the temperature of the cooling liquid in the fourth heat exchange passage 116 can be reduced, and the cooled cooling liquid can be used to cool the battery in the battery heat exchange system.

[0044] The expansion valve 13 is connected to the connecting member 14 via connecting pipes 17 and 18. The connecting member 14 is located between the first heat exchange section 11 and the second heat exchange section 12. The connecting member 14 is compactly structured and secured to the first heat exchange section 11 via welding of the first side portion 141 and the second side portion 142. The connecting member 14, the first heat exchange section 11, and the second heat exchange section 12 are welded together in a single furnace weld process, resulting in a simple overall structure and process. The expansion valve 13 is secured to the third side portion 143 via bolts, for example. This is done after the first heat exchange section 11 and the second heat exchange section 12 have been welded together. This helps ensure a more precise structure for the expansion valve 13, which in turn contributes to the overall structural accuracy of the evaporation unit 100.

[0045] The second heat exchange part 12 has a top 127 and a bottom 128, the top 127 of the second heat exchange part 12 is provided with the inlet of the refrigerant flow channel 15 and the outlet of the refrigerant flow channel 15, and the bottom 128 of the second heat exchange part 12 is welded and fixed to the connecting component 14; the first heat exchange part 11 has a top 113 and a bottom 112, the top 113 of the first heat exchange part 11 is provided with the coolant inlet and the coolant outlet, and the bottom 112 of the first heat exchange part 11 is welded and fixed to the connecting component 14.

[0046] The second heat exchange section 12 is provided with an inlet and an outlet for the refrigerant flow channel 15 at the top, and a coolant inlet and a coolant outlet at the top 113 of the first heat exchange section 11. The inlet and outlet of the refrigerant flow channel 15, the inlet and outlet of the coolant channel 16, and the outlet of the coolant channel 16 are used to connect to external structures in the system. The interface connecting the evaporation unit 100 to the system is simple and easy to connect. The bottom 112 of the first heat exchange section 11 is welded to the connecting component 14, and the bottom 128 of the second heat exchange section 12 is welded to the connecting component 14. The first heat exchange section 11, the connecting component 14, and the second heat exchange section 12 are welded together in the direction of the plate stacking to form an integrated structure. During welding, the three are fixed with a clamp and then can be put into the furnace for welding. The welding process is simple.

[0047] The connecting component 14 also has a third connecting channel 146 and a fourth connecting channel 147. One of the ports of the first connecting channel 144, the second connecting channel 145, the third connecting channel 146, and the fourth connecting channel 147 is arranged on the third side 143 of the connecting component 14. The connection ports of the expansion valve 13 and the connecting component 14 are both arranged on the third side 143, which facilitates the connection between the expansion valve 13 and the connecting component 14.

[0048] Another port of the second connecting channel 145 is defined as the first connecting port 148, another port of the third connecting channel 146 is defined as the second connecting port 149, another port of the first connecting channel 144 is defined as the third connecting port 150, and another port of the fourth connecting channel 147 is defined as the fourth connecting port 151. The first connecting port 148 and the second connecting port 149 are located on the first side 141 of the connecting component 14, and the third connecting port 150 and the fourth connecting port 151 are set on the second side 142 of the connecting component 14.

[0049] It should be noted that herein, the first connecting channel 144, the second connecting channel 145, the third connecting channel 146, the fourth connecting channel 147, the first connecting port 148, the second connecting port 149, the third connecting port 150, and the fourth connecting port 151 are not restricted in order and are defined for the purpose of distinguishing the structural positions. Furthermore, the shapes of these connecting ports are not limited to circular or square structures; they can also be slot-shaped, elongated, or other regular or irregular shapes.

[0050] Reference Figure 11-13 As an embodiment, the diagram illustrates a structural diagram of another evaporation unit 200 .

[0051] The evaporator unit 200 includes a first heat exchange portion 11, a second heat exchange portion 12, and a connecting member 14. The connecting member 14 has multiple independent structures. For example, the connecting member 14 includes a first portion 152 and a second portion 153. The first portion 152 is located between the expansion valve 13 and the first heat exchange portion 11 and is welded to the first heat exchange portion 11. The second portion 153 is located between the expansion valve 13 and the second heat exchange portion 12 and is welded to the second heat exchange portion 12. The first portion 152 has a first connecting channel 144, the second portion 153 has a second connecting channel 145, the first portion 152 has a third connecting channel 146, and the second portion 153 has a fourth connecting channel 147. It should be noted that the independent structures described herein merely indicate that the connecting member 14 is independent before being connected or secured to the heat exchange portion.

[0052] The first portion 152 and the second portion 153 can be independently provided. The first portion 152 is fixed to the first heat exchange portion 11, and the second portion 153 is fixed to the second heat exchange portion 12. The expansion valve fixes the first portion 152 and the second portion 153 to form a whole. The expansion valve 13 has a threaded hole for fixing to the first portion 152, and the expansion valve 13 has a threaded hole for fixing to the second portion 153.

[0053] The expansion valve 13 has a first side portion 141 and a second side portion 142, the first side portion 141 and the second side portion 142 are adjacent to each other, the inlet of the expansion valve 13 is located at the first side portion 141, and the outlet of the expansion valve 13 is located at the second side portion 142; the first part 152 has a first side surface 1521 opposite to the first side portion 141 of the expansion valve 13, and the second part 153 has a second side surface 1531 opposite to the second side portion 142 of the expansion valve 13, and the first side surface 1521 and the second side surface 1531 are arranged at an angle.

[0054] The first heat exchange portion 11 has a top and a bottom, and the second heat exchange portion 12 has a top and a bottom. The top 113 of the first heat exchange portion 11 is provided with the inlet and outlet of the refrigerant flow channel 15. The bottom 112 of the first heat exchange portion 11 is welded to the first portion 152. The top 127 of the second heat exchange portion 12 is provided with the coolant inlet and the coolant outlet. The bottom 128 of the second heat exchange portion 12 is welded to the second portion 153. The expansion valve 13 is fixed to the first portion 152, for example, by bolts, and the expansion valve 13 is fixed to the second portion 153, for example, by bolts.

[0055] The inlet and outlet of the refrigerant flow channel 15 are set at the top 127 of the second heat exchange part 12. As shown above, the first port 123 of the second heat exchange channel 121 is the inlet of the refrigerant flow channel 15, and the second port 126 of the third heat exchange channel 122 is the outlet of the refrigerant flow channel 15. The first heat exchange channel, the second heat exchange channel, the third heat exchange channel, the fourth heat exchange channel, etc. can refer to the above.

[0056] A coolant inlet and outlet are provided at the top 113 of the first heat exchange section 11, facilitating connection of the evaporator unit 200 to other components in the system. After welding the first portion 152 to the first heat exchange section 11 and the second portion 153 to the second heat exchange section 12, the expansion valve 13 is assembled and fixed to the first and second portions 152, 153 to form a single unit, simplifying assembly.

[0057] The expansion valve 13 is, for example, a thermal expansion valve 13. The expansion valve 13 includes a refrigerant inlet 131 (i.e., the inlet of the expansion valve 13), a refrigerant outlet 132 (i.e., the outlet of the expansion valve 13), a reflux inlet 133, and a reflux outlet 134. The reflux inlet 133 is connected to the third connecting channel 146, and the reflux outlet 134 is connected to the fourth connecting channel 147.

[0058] The inlet of the refrigerant flow channel 15 is connected to the second heat exchange channel 121, the first connecting channel 144, the inlet of the expansion valve 13, the outlet of the expansion valve 13, the second connecting channel 145, the first heat exchange channel 111, the fourth connecting channel 147, the return inlet 133, the return outlet 134, the third connecting channel 146, the third heat exchange channel 122, and the outlet of the refrigerant flow channel 15.

[0059] When the refrigerant enters the evaporation unit 100 from the inlet of the refrigerant flow channel 15, it exchanges heat with the refrigerant of different temperature in the third heat exchange channel 122 of the second heat exchange part 12 in the second heat exchange channel 121, and then enters the inlet of the expansion valve 13 from the first connecting channel 144 to be throttled and depressurized. Then, it enters the second connecting channel 145 from the outlet of the expansion valve 13 and enters the first heat exchange channel 111 of the first heat exchange part 11. The refrigerant evaporates and absorbs heat in the first heat exchange channel 111, and then enters the reflux inlet 133 from the fourth connecting channel 147 and exits from the reflux outlet 13. 4 enters the third connecting channel 146 and then enters the third heat exchange channel 122 of the second heat exchange section 12. Since the evaporator unit 100 is located downstream of the heat exchanger that serves as the condenser in the refrigeration system, the refrigerant before entering the evaporator unit 100 will be at a higher temperature than the refrigerant after evaporation in the first heat exchange channel 111, having just undergone cooling by the condenser. Therefore, the refrigerant exiting the first heat exchange channel 111 can absorb heat from the refrigerant in the second heat exchange channel 121 in the third heat exchange channel 122, further evaporating into superheated gas. In this way, the outlet of the refrigerant flow channel 15 connecting the evaporator unit 100 to the system can be directly connected to the compressor's air intake channel, facilitating system connection between the evaporator unit 100 and the compressor. Furthermore, the evaporator unit 100 is compact and occupies little space, and has a limited number of connection interfaces, making it easy to connect to the system and install.

[0060] As another embodiment, the connecting component 14 has a first portion 152 and a second portion 153, the first portion 152 is located between the expansion valve 13 and the first heat exchange part 11, the first portion 152 is welded to the bottom 112 of the first heat exchange part 11, the second portion 153 is located between the expansion valve 13 and the second heat exchange part 12, the second portion 153 is welded to the bottom 128 of the second heat exchange part 12, the first portion 152 has the first connecting channel 144, the second portion 153 has the second connecting channel 145, the first portion 152 has the third connecting channel 146, the second portion 153 has the fourth connecting channel 147, the first portion 152 and the second portion 153 are integrally arranged, the first portion 152 has a first side surface 1521 opposite to the first side surface 141 of the expansion valve 13, the second portion 153 has a second side surface 1531 opposite to the second side surface 142 of the expansion valve 13, and the first side surface 1521 and the second side surface 1531 are arranged at an angle, for example, in an L-shape.

[0061] Reference Figure 13 、 Figure 14 As an embodiment, the figure shows a schematic structural diagram of the evaporation unit 300.

[0062] The structure of the evaporation unit 300 is generally similar to that of the evaporation unit 100 . To avoid redundancy, the similarities are not described separately.

[0063] The connecting member 14 is made of metal, and the first and second heat exchange parts are also made of metal, such as aluminum alloy. The evaporation unit 300 has a first protrusion 154 and a second protrusion 155. A flow channel is provided inside the first protrusion 154, and a flow channel is provided inside the second protrusion 155. The flow channel inside the first protrusion 154 is part of the refrigerant flow channel, and the flow channel inside the second protrusion 155 is part of the refrigerant flow channel.

[0064] As an embodiment, the connecting component 14 has a first protrusion 154 and a second protrusion 155, the first protrusion 154 and the second protrusion 155 protrude toward the second heat exchange part, and the first protrusion 154 and the second protrusion 155 are welded and fixed to the second heat exchange part 12, and the contact area of ​​the first protrusion 154 and the second protrusion 155 with the second heat exchange part is smaller than the overall area of ​​the opposite side of the connecting component 14 and the second heat exchange part 12, the first protrusion 154 is provided with a flow channel, and the second protrusion 155 is provided with a flow channel, the flow channel inside the first protrusion 154 is part of the first connecting channel 144, and the flow channel inside the second protrusion 155 is part of the fourth connecting channel.

[0065] The expansion valve 13 is a thermal expansion valve. The working principle of the expansion valve is to adjust the size of the throttling hole according to the superheat of the refrigerant passing through the return channel. The refrigerant in the second heat exchange channel of the second heat exchange part is a refrigerant with a higher temperature from the condenser in the system or other components downstream of the condenser in the system. When the connecting component 14 and the second heat exchange part 12 are welded together, since both are made of metal materials with good thermal conductivity, the higher temperature refrigerant in the second heat exchange channel will be transferred to the expansion valve return channel through the second heat exchange part and the connecting component. Through the arrangement of the first convex portion and the second convex portion, the heat transfer between the second heat exchange part and the connecting component can be reduced to a certain extent, which helps the expansion valve to adjust the throttling opening more accurately, and helps to improve the refrigeration efficiency of the system using this evaporation unit.

[0066] As another embodiment, the second heat exchange part 12 has a first protrusion 154 and a second protrusion 155, the first protrusion and the second protrusion protrude toward the connecting part, and the first protrusion, the second protrusion and the connecting part are welded and fixed, and the contact area of ​​the first protrusion 154 and the second protrusion 155 with the connecting part is smaller than the overall area of ​​the connecting part 14 on the opposite side of the second heat exchange part 12.

[0067] In another embodiment, the first and second protrusions are independently provided from the second heat exchange portion and the connecting component when not assembled. The first and second protrusions are located between the connecting component and the second heat exchange portion. The internal flow channel of the first protrusion flows through the first connecting channel and the second heat exchange channel, and the internal flow channel of the second protrusion connects the third heat exchange channel and the third connecting channel. The length of the first and second protrusions is less than the thickness of the connecting component along the stacking direction of the first and second heat exchange portions. The first and second protrusions can be welded to the second heat exchange portion and the connecting component, or they can be compressed and sealed by a sealing ring or other structure.

[0068] In this embodiment, when the second heat exchange part and the connecting component are sealed and connected through the first protrusion and the second protrusion, since the second heat exchange part, the connecting part, the first protrusion and the second protrusion have maintained an unchanged position, this situation is also regarded as the situation where the second heat exchange part and the connecting component are fixed in this article.

[0069] Reference Figure 15 As another embodiment, the structure diagram of the evaporation unit 400 is shown in FIG.

[0070] The structure of the evaporation unit 400 is similar to that of the evaporation unit 100. To avoid redundancy, the similarities are not described separately. The evaporation unit 400 has a connecting component 14, which is made of metal. The first heat exchange part and the second heat exchange part are also made of metal, such as aluminum alloy.

[0071] The connecting component 14 has a recess 157, and a space is formed between the recess 157 and the contact surface of the second heat exchange component 12. The space can be a closed space or an open space connected to the external environment. Through the setting of this space, the direct contact between the second heat exchange component 12 and part of the surface of the connecting component is separated, the heat transfer area is reduced, the heat transfer efficiency is reduced, and it helps the expansion valve to adjust the throttling opening more accurately, which helps to improve the cooling efficiency of the system using the evaporation unit.

[0072] In typical thermal management systems, considering that a small amount of liquid refrigerant may remain at the evaporator outlet, a long pipeline is typically connected between the evaporator outlet and the compressor. This allows the refrigerant at the evaporator outlet to further superheat and evaporate within the longer pipeline, forming a superheated gas with a temperature slightly higher than the evaporation temperature before entering the compressor. However, in thermal management systems employing the evaporation unit 100 / 200 / 300 / 400 of this technical solution, the evaporation unit 100 / 200 / 300 / 400 can be directly connected to the compressor via a connecting block or short pipe, simplifying system connections, saving some piping, and reducing costs. The following further describes the implementation of the thermal management system.

[0073] Reference Figure 16 As an embodiment, a thermal management system 500 includes a compressor 501, a condenser 502, and an evaporation unit 100 / 200 / 300 / 400. The evaporation unit 100 / 200 / 300 / 400 is located downstream of the condenser. The evaporation unit 100 / 200 / 300 / 400 includes an inlet of a refrigerant flow channel 15 and an outlet of the refrigerant flow channel 15. The inlet of the refrigerant flow channel 15 is connected downstream of the condenser 502, and the outlet of the refrigerant flow channel 15 is connected to the inlet of the compressor 501.

[0074] The fluid in the first heat exchange channel 111, the second heat exchange channel 121, and the third heat exchange channel 122 of the evaporation unit 100 / 200 / 300 / 400 is refrigerant. After the condenser exchanges heat with the outside and cools down the temperature, the refrigerant enters the second heat exchange channel 121 through the inlet of the refrigerant flow channel 15, and after heat exchange in the second heat exchange part 12, enters the inlet of the expansion valve 13, and enters the first heat exchange channel 111 from the outlet of the expansion valve 13. After the refrigerant evaporates and absorbs heat in the first heat exchange channel 111, it enters the third heat exchange channel 122. The refrigerant in the third heat exchange channel 122 absorbs the heat of the refrigerant in the second heat exchange channel 121 and leaves from the outlet of the refrigerant flow channel 15. The refrigerant temperature at the outlet of the third heat exchange channel 122 is higher than the refrigerant temperature at the outlet of the first heat exchange channel 111.

[0075] It should be noted that the thermal management system herein is not limited to only the above-mentioned components, and the thermal management system may, for example, also have a gas-liquid separator, various valves, etc. It should be clear that the evaporation unit 100 / 200 / 300 / 400 is located downstream of the condenser only to illustrate that the flow direction of the refrigerant of the evaporation unit 100 / 200 / 300 / 400 is downstream of the condenser, and a plurality of components can also be provided between the evaporation unit 100 / 200 / 300 / 400 and the condenser.

[0076] The evaporation unit 100 / 200 / 300 / 400 comprises a fourth heat exchange channel 116, a cooling liquid inlet and a cooling liquid outlet, which are in communication with the fourth heat exchange channel 116;

[0077] The thermal management system comprises a battery cooling passage 505, and the cooling liquid inlet and the cooling liquid outlet are in communication with the battery cooling passage for cooling the battery; the battery cooling passage 505 is circulated by a pump 503.

[0078] The refrigerant absorbs the heat of the cooling liquid in the fourth heat exchange channel 116 in the first heat exchange channel 111, and the cooled cooling liquid exits from the cooling liquid outlet.

[0079] In this way, the cooling liquid can exit the evaporation unit 100 / 200 / 300 / 400 from the cooling liquid outlet after being cooled in the fourth heat exchange channel 116, and enter the battery cooling passage of the thermal management system for cooling the battery.

[0080] Other embodiments of the evaporation unit 100 / 200 / 300 / 400 can be referred to the above description.

[0081] It should be noted that the above examples are only used to illustrate the technical solutions described in the present application and are not intended to limit the technical solutions described in the present application. For example, the directions such as "front", "back", "left", "right", "up", "down", etc. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that those skilled in the art can still combine, modify or replace the present application, and all technical solutions and improvements that do not deviate from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. An evaporation unit, comprising a first heat exchange portion and an expansion valve, characterized in that: The heat exchanger comprises a first heat exchange portion and a connecting component, wherein the first heat exchange portion comprises a core formed by stacking plates, the second heat exchange portion comprises a core formed by stacking plates, the first heat exchange portion comprises a bottom and a top along the stacking direction of the plates of the first heat exchange portion, the second heat exchange portion comprises a bottom and a top along the stacking direction of the plates of the second heat exchange portion, the connecting component comprises a first side portion and a second side portion, the first side portion of the connecting component is fixed to the bottom of the first heat exchange portion, and the second side portion of the connecting component is fixed to the bottom of the second heat exchange portion; the expansion valve is fixedly arranged on the connecting component; the first heat exchange portion to The heat exchange unit comprises at least a first heat exchange channel, the second heat exchange unit comprises at least a second heat exchange channel and a third heat exchange channel, the evaporation unit comprises a refrigerant flow channel, the refrigerant flow channel comprises the first heat exchange channel, the second heat exchange channel, and the third heat exchange channel, the connecting component comprises a first connecting channel and a second connecting channel, the expansion valve comprises a refrigerant inlet and a refrigerant outlet, the first connecting channel connects the second heat exchange channel and the refrigerant inlet, the second connecting channel connects the refrigerant outlet and the first port of the first heat exchange channel, and the second port of the first heat exchange channel is communicated with the third heat exchange channel.

2. The evaporation unit according to claim 1, characterized in that The second port of the second heat exchange channel is the inlet of the refrigerant flow channel, the first port of the second heat exchange channel is in communication with the first connecting channel, the first port of the third heat exchange channel is in communication with the second port of the first heat exchange channel, and the second port of the third heat exchange channel is the outlet of the refrigerant flow channel; The bottom of the first heat exchange portion has a first port of the first heat exchange channel, and the bottom of the second heat exchange portion has a first port of the second heat exchange channel; The first port of the second heat exchange channel is in communication with the first connecting channel, and the second connecting channel is in communication with the first port of the first heat exchange channel; The bottom of the second heat exchange portion has a first port of the third heat exchange channel, the bottom of the first heat exchange portion has a second port of the first heat exchange channel, and the first port of the third heat exchange channel is in communication with the second port of the first heat exchange channel; The inlet and the outlet of the refrigerant flow channel are located at the top of the second heat exchange portion, the expansion valve includes a reflux inlet and a reflux outlet, the inlet of the refrigerant flow channel is connected to the second heat exchange channel, the first connecting channel, the refrigerant inlet of the expansion valve, the refrigerant outlet of the expansion valve, the second connecting channel, the first heat exchange channel, the reflux inlet, the reflux outlet, the third heat exchange channel, and the outlet of the refrigerant flow channel; The refrigerant temperature of the second port of the third heat exchange channel is higher than the refrigerant temperature of the second port of the first heat exchange channel.

3. The evaporation unit according to claim 1, characterized in that The evaporation unit has a cooling liquid channel, the first heat exchange part has a fourth heat exchange channel, the cooling liquid channel includes the fourth heat exchange channel, the refrigerant in the first heat exchange channel can exchange heat with the cooling liquid in the fourth heat exchange channel, the evaporation unit has a cooling liquid inlet and a cooling liquid outlet, the cooling liquid inlet and the cooling liquid outlet are located in the first heat exchange part, the cooling liquid inlet and the cooling liquid outlet are connected to the fourth heat exchange channel, and the cooling liquid inlet and the cooling liquid outlet are set on the top of the first heat exchange part.

4. The evaporation unit according to claim 2, characterized in that The evaporation unit has a cooling liquid channel, the first heat exchange part has a fourth heat exchange channel, the cooling liquid channel includes the fourth heat exchange channel, the refrigerant in the first heat exchange channel can exchange heat with the cooling liquid in the fourth heat exchange channel, the evaporation unit has a cooling liquid inlet and a cooling liquid outlet, the cooling liquid inlet and the cooling liquid outlet are located in the first heat exchange part, the cooling liquid inlet and the cooling liquid outlet are connected to the fourth heat exchange channel, and the cooling liquid inlet and the cooling liquid outlet are set on the top of the first heat exchange part.

5. The evaporation unit according to any one of claims 1 to 4, characterized in that: The connecting component is located between the first heat exchange part and the second heat exchange part, and has a first side, a second side, and a third side. The first side is welded and fixed to the bottom of the first heat exchange part, and the second side is welded and fixed to the bottom of the second heat exchange part. The expansion valve is fixed to the third side by bolts; in a direction parallel to the plate of the first heat exchange part, the expansion valve protrudes from the connecting component.

6. The evaporation unit according to claim 5, characterized in that The connecting component has a third connecting channel and a fourth connecting channel, and the third connecting channel and the fourth connecting channel are arranged on the third side portion of the connecting component; Another port of the second connecting channel is defined as a first connecting port, another port of the third connecting channel is defined as a second connecting port, another port of the first connecting channel is defined as a third connecting port, and another port of the fourth connecting channel is defined as a fourth connecting port. The first connecting port and the second connecting port are located on the first side of the connecting component, and the third connecting port and the fourth connecting port are arranged on the second side of the connecting component.

7. The evaporation unit according to any one of claims 1 to 4, characterized in that: The connecting component has a first part and a second part, the first part is located between the expansion valve and the first heat exchange part, and the first part is welded and fixed to the bottom of the first heat exchange part, the second part is located between the expansion valve and the second heat exchange part, and the second part is welded and fixed to the bottom of the second heat exchange part, the first part has the first connecting channel, the second part has the second connecting channel, the first part has a third connecting channel, and the second part has a fourth connecting channel.

8. The evaporation unit according to claim 7, characterized in that The first part and the second part may be independently provided, the first part being fixed to the first heat exchange part, the second part being fixed to the second heat exchange part, and the expansion valve being fixed to the first part and the second part forming an integral whole; or the first part and the second part being integrally provided, the expansion valve having a threaded hole for fixing to the first part, and the expansion valve having a threaded hole for fixing to the second part; The expansion valve has a first side portion and a second side portion, the first side portion and the second side portion are adjacent to each other, the refrigerant inlet of the expansion valve is located at the first side portion, and the refrigerant outlet of the expansion valve is located at the second side portion; the first portion has a first side surface opposite to the first side portion of the expansion valve, the second portion has a second side surface opposite to the second side portion of the expansion valve, and the first side surface is arranged at an angle to the second side surface.

9. The evaporation unit according to claim 8, characterized in that The expansion valve includes a reflux inlet and a reflux outlet, and the inlet of the refrigerant flow channel is connected to the second heat exchange channel, the first connecting channel, the refrigerant inlet of the expansion valve, the refrigerant outlet of the expansion valve, the second connecting channel, the first heat exchange channel, the fourth connecting channel, the reflux inlet, the reflux outlet, the third connecting channel, the third heat exchange channel, and the outlet of the refrigerant flow channel.

10. The evaporation unit according to any one of claims 1 to 4, characterized in that: The connecting component is made of metal, the first heat exchange portion and the second heat exchange portion are made of metal, the evaporation unit has a first convex portion and a second convex portion, a flow channel is provided inside the first convex portion, a flow channel is provided inside the second convex portion, the flow channel inside the first convex portion is part of the refrigerant flow channel, and the flow channel inside the second convex portion is part of the refrigerant flow channel; The connecting component has a first convex portion and a second convex portion, the first convex portion and the second convex portion protrude toward the second heat exchange portion, and the first convex portion, the second convex portion and the second heat exchange portion are welded and fixed, the contact area of ​​the first convex portion and the second convex portion with the second heat exchange portion is smaller than the overall area of ​​the connecting component on the opposite side to the second heat exchange portion, and the internal flow channel of the first convex portion is a part of the first connecting channel; or the second heat exchange portion has the first convex portion and the second convex portion, the first convex portion and the second convex portion protrude toward the connecting component, and the first convex portion, the second convex portion and the connecting component are welded and fixed, and the contact area of ​​the first convex portion and the second convex portion with the connecting component is smaller than the overall area of ​​the connecting component on the opposite side to the second heat exchange portion The entire area of ​​the connecting component on the opposite side of the second heat exchange component; the internal flow channel of the first convex part is a part of the first connecting channel; or the first convex part and the second convex part are independently arranged with the second heat exchange part and the connecting component when not assembled, the first convex part and the second convex part are located between the connecting component and the second heat exchange part, the length of the first convex part and the second convex part is less than the thickness of the connecting component along the stacking direction of the first heat exchange part and the second heat exchange part, the first convex part and the second convex part are welded and fixed to the second heat exchange part and the connecting component, the internal flow channel of the first convex part flows through the first connecting channel and the second heat exchange channel, and the internal flow channel of the second convex part connects the third heat exchange channel and the first heat exchange channel.

11. A thermal management system comprising a compressor and a condenser, characterized in that: comprising an evaporation unit according to any one of claims 1 to 4, 6, and 8 to 9, the evaporation unit being located downstream of the condenser, the evaporation unit comprising an inlet of a refrigerant flow channel and an outlet of the refrigerant flow channel, the inlet of the refrigerant flow channel being connected to the downstream of the condenser, and the outlet of the refrigerant flow channel being connected to the inlet of the compressor; The fluid in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel of the evaporation unit is refrigerant, the second port of the second heat exchange channel is the inlet of the refrigerant flow channel, and the second port of the third heat exchange channel is the outlet of the refrigerant flow channel; after the condenser exchanges heat and cools down the temperature, the refrigerant enters the second heat exchange channel through the inlet of the refrigerant flow channel, and after heat exchange in the second heat exchange part, enters the refrigerant inlet of the expansion valve, and enters the first heat exchange channel from the refrigerant outlet of the expansion valve. After the refrigerant evaporates and absorbs heat in the first heat exchange channel, it enters the third heat exchange channel. The refrigerant in the third heat exchange channel absorbs the heat of the refrigerant in the second heat exchange channel and leaves from the outlet of the refrigerant flow channel. The refrigerant temperature at the second port of the third heat exchange channel is higher than the refrigerant temperature at the second port of the first heat exchange channel.

12. The thermal management system according to claim 11, wherein: The thermal management system includes a battery cooling passage, the evaporation unit includes a coolant flow channel, the coolant flow channel includes a fourth heat exchange channel, the inlet and outlet of the coolant flow channel are connected to the battery cooling passage for cooling the battery; the inlet and outlet of the coolant flow channel are located at the top of the first heat exchange part; the refrigerant absorbs the heat of the coolant in the fourth heat exchange channel in the first heat exchange channel, and the cooled coolant leaves from the outlet of the coolant flow channel.

13. A thermal management system comprising a compressor and a condenser, characterized in that: comprising the evaporation unit according to claim 5, the evaporation unit being located downstream of the condenser, the evaporation unit comprising an inlet of a refrigerant flow passage and an outlet of the refrigerant flow passage, the inlet of the refrigerant flow passage being connected to the downstream of the condenser, and the outlet of the refrigerant flow passage being communicated with the inlet of the compressor; The fluid in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel of the evaporation unit is refrigerant, the second port of the second heat exchange channel is the inlet of the refrigerant flow channel, and the second port of the third heat exchange channel is the outlet of the refrigerant flow channel; after the condenser exchanges heat and cools down the temperature, the refrigerant enters the second heat exchange channel through the inlet of the refrigerant flow channel, and after heat exchange in the second heat exchange part, enters the refrigerant inlet of the expansion valve, and enters the first heat exchange channel from the refrigerant outlet of the expansion valve. After the refrigerant evaporates and absorbs heat in the first heat exchange channel, it enters the third heat exchange channel. The refrigerant in the third heat exchange channel absorbs the heat of the refrigerant in the second heat exchange channel and leaves from the outlet of the refrigerant flow channel. The refrigerant temperature at the second port of the third heat exchange channel is higher than the refrigerant temperature at the second port of the first heat exchange channel.

14. The thermal management system according to claim 13, wherein: The thermal management system includes a battery cooling passage, the evaporation unit includes a coolant flow channel, the coolant flow channel includes a fourth heat exchange channel, the inlet and outlet of the coolant flow channel are connected to the battery cooling passage for cooling the battery; the inlet and outlet of the coolant flow channel are located at the top of the first heat exchange part; the refrigerant absorbs the heat of the coolant in the fourth heat exchange channel in the first heat exchange channel, and the cooled coolant leaves from the outlet of the coolant flow channel.

15. A thermal management system comprising a compressor and a condenser, characterized in that: comprising the evaporation unit according to claim 7, the evaporation unit being located downstream of the condenser, the evaporation unit comprising an inlet of a refrigerant flow passage and an outlet of the refrigerant flow passage, the inlet of the refrigerant flow passage being connected to the downstream of the condenser, and the outlet of the refrigerant flow passage being communicated with the inlet of the compressor; The fluid in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel of the evaporation unit is refrigerant, the second port of the second heat exchange channel is the inlet of the refrigerant flow channel, and the second port of the third heat exchange channel is the outlet of the refrigerant flow channel; after the condenser exchanges heat and cools down the temperature, the refrigerant enters the second heat exchange channel through the inlet of the refrigerant flow channel, and after heat exchange in the second heat exchange part, enters the refrigerant inlet of the expansion valve, and enters the first heat exchange channel from the refrigerant outlet of the expansion valve. After the refrigerant evaporates and absorbs heat in the first heat exchange channel, it enters the third heat exchange channel. The refrigerant in the third heat exchange channel absorbs the heat of the refrigerant in the second heat exchange channel and leaves from the outlet of the refrigerant flow channel. The refrigerant temperature at the second port of the third heat exchange channel is higher than the refrigerant temperature at the second port of the first heat exchange channel.

16. The thermal management system according to claim 15, wherein: The thermal management system includes a battery cooling passage, the evaporation unit includes a coolant flow channel, the coolant flow channel includes a fourth heat exchange channel, the inlet and outlet of the coolant flow channel are connected to the battery cooling passage for cooling the battery; the inlet and outlet of the coolant flow channel are located at the top of the first heat exchange part; the refrigerant absorbs the heat of the coolant in the fourth heat exchange channel in the first heat exchange channel, and the cooled coolant leaves from the outlet of the coolant flow channel.

17. A thermal management system comprising a compressor and a condenser, characterized in that: comprising the evaporation unit according to claim 10, the evaporation unit being located downstream of the condenser, the evaporation unit comprising an inlet of a refrigerant flow passage and an outlet of the refrigerant flow passage, the inlet of the refrigerant flow passage being connected to the downstream of the condenser, and the outlet of the refrigerant flow passage being communicated with the inlet of the compressor; The fluid in the first heat exchange channel, the second heat exchange channel and the third heat exchange channel of the evaporation unit is refrigerant, the second port of the second heat exchange channel is the inlet of the refrigerant flow channel, and the second port of the third heat exchange channel is the outlet of the refrigerant flow channel; after the condenser exchanges heat and cools down the temperature, the refrigerant enters the second heat exchange channel through the inlet of the refrigerant flow channel, and after heat exchange in the second heat exchange part, enters the refrigerant inlet of the expansion valve, and enters the first heat exchange channel from the refrigerant outlet of the expansion valve. After the refrigerant evaporates and absorbs heat in the first heat exchange channel, it enters the third heat exchange channel. The refrigerant in the third heat exchange channel absorbs the heat of the refrigerant in the second heat exchange channel and leaves from the outlet of the refrigerant flow channel. The refrigerant temperature at the second port of the third heat exchange channel is higher than the refrigerant temperature at the second port of the first heat exchange channel.

18. The thermal management system according to claim 17, wherein: The thermal management system includes a battery cooling passage, the evaporation unit includes a coolant flow channel, the coolant flow channel includes a fourth heat exchange channel, the inlet and outlet of the coolant flow channel are connected to the battery cooling passage for cooling the battery; the inlet and outlet of the coolant flow channel are located at the top of the first heat exchange part; the refrigerant absorbs the heat of the coolant in the fourth heat exchange channel in the first heat exchange channel, and the cooled coolant leaves from the outlet of the coolant flow channel.

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