Thermal management system and vehicle

Abstract

The utility model provides a thermal management system and a vehicle. Comprising a first heat exchanger, a second heat exchanger, a compressor and an air conditioner heat exchange branch, the first heat exchanger and the second heat exchanger are connected through the compressor, the air conditioner heat exchange branch comprises a heat exchanger core, and the heat exchanger core comprises a shell assembly, a first inlet, a second inlet, a first outlet, a second outlet and a first flow channel communicating with the first inlet and the first outlet. The second flow channel is communicated with the second inlet and the second outlet; the first flow channel communicates with the first heat exchanger or the second heat exchanger, and the second flow channel communicates with the first heat exchanger or the second heat exchanger. In this way, the heat management system can pass through the first flow channel and the second flow channel under different conditions, it is guaranteed that fluid in the heat management system can flow into the same heat exchanger core for the second time, the heat exchange performance is improved, the structure is simple, and the weight is smaller.

Description

Technical Field

[0001] The present application relates to the field of thermal management, and in particular to a thermal management system and a vehicle. Background Art

[0002] The thermal management system plays an important role in temperature control in vehicles, and can coordinate the temperature of the vehicle to ensure the safety and stability of the vehicle. In related technologies, due to the multiple modes of the thermal management system, more components are required to adjust different modes, resulting in a complex air-conditioning structure that cannot be easily adjusted, and a larger volume. When in use, the heat exchange performance is low. Utility Model Content

[0003] The present application provides a thermal management system and a vehicle with a simple air conditioning structure, a small size, and a high heat exchange performance.

[0004] The present application provides a thermal management system, comprising: a first heat exchanger, a second heat exchanger, a compressor, and an air conditioning heat exchange branch, wherein the first heat exchanger and the second heat exchanger are connected via the compressor, the air conditioning heat exchange branch comprises a heat exchanger core, the heat exchanger core comprises a shell component, a first inlet, a second inlet, a first outlet, a second outlet, a first flow channel connecting the first inlet and the first outlet, and a second flow channel connecting the second inlet and the second outlet, the first inlet, the first outlet, the second inlet, and the second outlet are located in the same shell component, and the first flow channel and the second flow channel are arranged in the same shell component;

[0005] The first flow channel is in communication with the first heat exchanger or the second heat exchanger, and the second flow channel is in communication with the first heat exchanger or the second heat exchanger.

[0006] Optionally, the first inlet and the second inlet are respectively connected to the outlet of the first heat exchanger, and the first outlet and the second outlet are respectively connected to the inlet of the first heat exchanger, and in cooling mode, the first flow channel and the second flow channel are connected in parallel and communicate with the first heat exchanger;

[0007] The first inlet and the second inlet are respectively connected to the outlet of the second heat exchanger, and the first outlet and the second outlet are respectively connected to the inlet of the second heat exchanger. In heating mode, the first flow channel is connected in parallel with the second flow channel and communicates with the second heat exchanger.

[0008] Optionally, the thermal management system includes an on-off valve, wherein the on-off valve is connected between the second inlet and the outlet of the first heat exchanger, and is connected between the first inlet and the outlet of the second heat exchanger;

[0009] In cooling mode and heating mode, the on-off valve is opened; in dehumidification mode, the on-off valve is closed, the first heat exchanger is connected to the first flow channel, and the second heat exchanger is connected to the second flow channel.

[0010] Optionally, the thermal management system includes a first control valve assembly, which is connected between the first inlet and the outlet of the first heat exchanger, and between the second inlet and the outlet of the first heat exchanger, and is used to control the opening and closing of the first inlet and the outlet of the first heat exchanger, and the opening and closing of the second inlet and the outlet of the first heat exchanger.

[0011] Optionally, the thermal management system includes a second control valve assembly, which is connected between the first inlet and the outlet of the second heat exchanger, and between the second inlet and the outlet of the second heat exchanger, and is used to control the opening and closing of the first inlet and the outlet of the second heat exchanger, and the opening and closing of the second inlet and the outlet of the second heat exchanger.

[0012] Optionally, the thermal management system includes a battery heat exchange branch for exchanging heat for the power battery and a third switching valve assembly, and the battery heat exchange branch is connected in parallel with the air conditioning heat exchange branch;

[0013] The third switching valve assembly includes a cooling connection state and a heating connection state, and the third switching valve assembly can be switched between the cooling connection state and the heating connection state; in the cooling connection state, the third switching valve assembly connects the battery heat exchange branch and the first heat exchanger, and in the heating connection state, the third switching valve assembly connects the battery heat exchange branch and the second heat exchanger;

[0014] In the cooling mode, the third switching valve assembly is in the cooling communication state, and in the heating mode, the third switching valve assembly is in the heating communication state.

[0015] Optionally, the third switching valve assembly includes a first switching inlet and a first switching outlet. In the refrigeration connection state, the first switching inlet is connected to one end of the battery heat exchange branch, and the first switching outlet is connected to the other end of the battery heat exchange branch.

[0016] Optionally, the thermal management system also includes a first unidirectional branch, the first unidirectional branch includes a first end and a second end, the unidirectional conduction direction of the first unidirectional branch is from the second end to the first end, the first end of the first unidirectional branch is connected between the first switching inlet and the outlet of the first heat exchanger, and the second end of the first unidirectional branch is connected between the first switching outlet and the inlet of the first heat exchanger; the cooling mode includes an air-conditioning cooling mode alone; in the air-conditioning cooling mode alone, the first unidirectional branch forms a loop with the battery heat exchange branch.

[0017] Optionally, the third switching valve assembly includes a second switching inlet and a second switching outlet. In the heating connection state, the second switching inlet is connected to one end of the battery heat exchange branch, and the second switching outlet is connected to the other end of the battery heat exchange branch.

[0018] Optionally, the thermal management system also includes a second one-way branch, the second one-way branch includes a third end and a fourth end, the one-way conduction direction of the second one-way branch is from the fourth end to the third end, the third end of the second one-way branch is connected between the second switching inlet and the outlet of the second heat exchanger, the fourth end of the second one-way branch is connected between the second switching outlet and the inlet of the second heat exchanger, and the heating mode includes an air-conditioning heating mode alone. In the air-conditioning heating mode alone, the second one-way branch forms a loop with the battery heat exchange branch.

[0019] Optionally, the thermal management system includes a motor heat exchange branch for exchanging heat for the power motor and a third switching valve assembly, the motor heat exchange branch includes a radiator, and the motor heat exchange branch passes through the power motor;

[0020] The third switching valve assembly includes a first heat dissipation state of the motor and a second heat dissipation state of the motor, and the third switching valve assembly can switch between the first heat dissipation state of the motor and the second heat dissipation state of the motor; in the first heat dissipation state of the motor, the third switching valve assembly connects the motor heat dissipation branch and the second heat exchanger, and in the second heat dissipation state of the motor, the third switching valve assembly connects the motor heat exchange branch and the first heat exchanger.

[0021] Optionally, the motor heat exchange branch includes a motor heat exchange sub-branch connected between the outlet of the radiator and the third switching valve assembly, and the motor heat exchange sub-branch passes through the power motor;

[0022] The thermal management system includes a shunt branch, which is provided with a flow control valve. One end of the shunt branch is connected between the motor heat exchange sub-branch and the outlet of the radiator, and the other end of the shunt branch is connected between the third switching valve assembly and the inlet of the second heat exchanger.

[0023] Optionally, the thermal management system further includes an expansion valve, and the first heat exchanger, the compressor, the second heat exchanger and the expansion valve are connected in sequence.

[0024] Optionally, the thermal management system includes a liquid storage tank connected between the second heat exchanger and the expansion valve.

[0025] Optionally, the thermal management system includes a first filling port, which is arranged between the second heat exchanger and the expansion valve.

[0026] Optionally, the thermal management system includes a second filling port, which is arranged between the first heat exchanger and the compressor.

[0027] Optionally, the thermal management system includes a first temperature and pressure sensor, and the first temperature and pressure sensor is arranged between the first heat exchanger and the compressor.

[0028] Optionally, the thermal management system includes a second temperature and pressure sensor, and the second temperature and pressure sensor is arranged between the compressor and the second heat exchanger.

[0029] Optionally, the thermal management system includes a muffler, which is arranged between the compressor and the second heat exchanger.

[0030] The present application also provides a vehicle, including: a power battery, a power motor and the aforementioned thermal management system, wherein the thermal management system passes through the power battery to exchange heat for the power battery, and the thermal management system passes through the power motor to dissipate heat for the power motor.

[0031] The thermal management system and vehicle provided in the present application are connected to the first heat exchanger or the second heat exchanger through the first flow channel, and the second flow channel is connected to the first heat exchanger or the second heat exchanger, so that the thermal management system can pass through the first flow channel and the second flow channel under different circumstances, thereby ensuring that the fluid in the thermal management system can flow into the same heat exchanger core for a second time, thereby improving the heat exchange performance, and the structure is simple and the weight is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0033] Figure 1 FIG. 1 is a schematic diagram of an embodiment of a thermal management system of the present application.

[0034] Figure 2 FIG. 1 is a schematic diagram showing an embodiment of a cooling mode of a thermal management system of the present application.

[0035] Figure 3 Shown is a schematic diagram of an embodiment of a heating mode of a thermal management system of the present application.

[0036] Figure 4 Shown is a schematic diagram of an embodiment of a dehumidification mode of a thermal management system of the present application.

[0037] Description of reference numerals:

[0038] Thermal management system 100; battery heat exchange branch 110; first one-way branch 120; first end 121; second end 122; first one-way valve 123; second one-way branch 130; third end 131; fourth end 132; second one-way valve 133; motor heat exchange branch 140; radiator 141; motor heat exchange sub-branch 142; shunt branch 150; flow control valve 151; power battery 200; power motor 300; first heat exchanger 1; second heat exchanger 2; air conditioning heat exchange branch 3; heat exchanger core 31; housing assembly 311; The first inlet 312; the second inlet 313; the first outlet 314; the second outlet 315; the first flow channel 316; the second flow channel 317; the on-off valve 32; the first control valve assembly 4; the second control valve assembly 5; the third switching valve assembly 7; the first switching inlet 71; the first switching outlet 72; the second switching inlet 73; the second switching outlet 74; the compressor 8; the expansion valve 81; the liquid storage tank 82; the first filling port 83; the second filling port 84; the first temperature and pressure sensor 85; the second temperature and pressure sensor 86; the muffler 87; the water pump 88. DETAILED DESCRIPTION

[0039] Here, the technical solutions in the embodiments (or "implementations") of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0040] If there are terms involving directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0041] The thermal management system of the present application includes: a first heat exchanger, a second heat exchanger, a compressor and an air conditioning heat exchange branch, the first heat exchanger and the second heat exchanger are connected through a compressor, the air conditioning heat exchange branch includes a heat exchanger core, the heat exchanger core includes a shell component, a first inlet, a second inlet, a first outlet, a second outlet, a first flow channel connecting the first inlet and the first outlet, and a second flow channel connecting the second inlet and the second outlet, the first inlet, the first outlet, the second inlet and the second outlet are located in the same shell component, and the first flow channel and the second flow channel are arranged in the same shell component; the first flow channel is connected to the first heat exchanger or the second heat exchanger, and the second flow channel is connected to the first heat exchanger or the second heat exchanger. The thermal management system and vehicle provided by the present application are connected to the first heat exchanger or the second heat exchanger through the first flow channel, and the second flow channel is connected to the first heat exchanger or the second heat exchanger, so that the thermal management system can pass through the first flow channel and the second flow channel in different situations, so as to ensure that the fluid in the thermal management system can flow into the same heat exchanger core twice, improve the heat exchange performance, and have a simple structure and smaller weight.

[0042] The present application provides a thermal management system and a vehicle. The thermal management system and the vehicle of the present application are described in detail below in conjunction with the accompanying drawings.

[0043] Figure 1 FIG. 1 is a schematic diagram of an embodiment of a thermal management system 100 of the present application. Figure 1In the illustrated embodiment, the vehicle includes a power battery 200, a power motor 300 and a thermal management system 100. The thermal management system 100 is used to exchange heat between the power battery 200 and the power motor 300. The thermal management system 100 passes through the power battery 200 to exchange heat between the power battery 200. The thermal management system 100 passes through the power motor 300 to dissipate heat from the power motor 300. The thermal management system 100 includes a first heat exchanger 1, a second heat exchanger 2, a compressor 8 and an air conditioning heat exchange branch 3. The first heat exchanger 1 may be an evaporator (chiller). The second heat exchanger 2 may be a condenser (LCC). The refrigerant circulating in the evaporator absorbs heat. The refrigerant circulating in the condenser releases heat. After passing through the compressor 8, the refrigerant changes from a low temperature and low pressure state to a high temperature and high pressure state. The air conditioning heat exchange branch 3 is used to operate during air conditioning cooling and air conditioning heating. The first heat exchanger 1 and the second heat exchanger 2 are connected through the compressor 8, and the air conditioning heat exchange branch 3 includes a heat exchanger core 31. The heat exchanger core 31 is used to realize the cooling and heating functions of the air conditioner through the temperature damper. The heat exchanger core 31 includes a housing component 311, a first inlet 312, a second inlet 313, a first outlet 314, a second outlet 315, a first flow channel 316 connecting the first inlet 312 and the first outlet 314, and a second flow channel 317 connecting the second inlet 313 and the second outlet 315. The first flow channel 316 and the second flow channel 317 are located inside the heat exchanger core 31. The first inlet 312, the first outlet 314, the second inlet 313 and the second outlet 315 are located in the same housing component 311, and the first flow channel 316 and the second flow channel 317 are arranged in the same housing component 311. In this embodiment, the first flow channel 316 and the second flow channel 317 are not interconnected. The first flow channel 316 is connected to the first heat exchanger 1 or the second heat exchanger 2, and the second flow channel 317 is connected to the first heat exchanger 1 or the second heat exchanger 2. In this way, the first flow channel 316 is connected to the first heat exchanger 1 or the second heat exchanger 2, and the second flow channel 317 is connected to the first heat exchanger 1 or the second heat exchanger 2, so that the thermal management system 100 can pass through the first flow channel 316 and the second flow channel 317 under different conditions, thereby ensuring that the fluid in the thermal management system 100 can flow into the same heat exchanger core 31 for a second time, thereby improving the heat exchange performance, and the structure is simple and the weight is smaller.

[0044] The first inlet 312 and the second inlet 313 are respectively connected to the outlet of the first heat exchanger 1, and the first outlet 314 and the second outlet 315 are respectively connected to the inlet of the first heat exchanger 1. In the cooling mode, the first flow channel 316 and the second flow channel 317 are connected in parallel and communicate with the first heat exchanger 1. In this way, when in the cooling mode, the fluid medium can sequentially pass through the outlet of the first heat exchanger 1, the first inlet 312 of the heat exchanger core 31, the first outlet 314 of the heat exchanger core 31, and the inlet of the first heat exchanger 1, and sequentially pass through the outlet of the first heat exchanger 1, the second inlet 313 of the heat exchanger core 31, the second outlet 315 of the heat exchanger core 31, and the inlet of the first heat exchanger 1, thereby improving the heat exchange performance of the heat exchanger core 31 in the cooling mode and improving the efficiency. The first inlet 312 and the second inlet 313 are respectively connected to the outlet of the second heat exchanger 2, the first outlet 314 and the second outlet 315 are respectively connected to the inlet of the second heat exchanger 2, and in the heating mode, the first flow channel 316 and the second flow channel 317 are connected in parallel and communicate with the second heat exchanger 2. In this way, when in the heating mode, the fluid medium can sequentially pass through the outlet of the second heat exchanger 2, the first inlet 312 of the heat exchanger core 31, the first outlet 314 of the heat exchanger core 31, and the inlet of the second heat exchanger 2, and sequentially pass through the outlet of the second heat exchanger 2, the second inlet 313 of the heat exchanger core 31, the second outlet 315 of the heat exchanger core 31, and the inlet of the second heat exchanger 2, thereby improving the heat exchange performance of the heat exchanger core 31 in the heating mode and improving the efficiency. In this way, in the cooling mode, the first flow channel 316 and the second flow channel 317 are connected in parallel and connected to the first heat exchanger 1; in the heating mode, the first flow channel 316 and the second flow channel 317 are connected in parallel and connected to the second heat exchanger 2, so that the fluid in the thermal management system 100 flows into the same heat exchanger core 31 in the cooling mode or the heating mode, ensuring a simple structure and a smaller weight, and can flow into the heat exchanger core 31 for a second time in the cooling mode or the heating mode, thereby improving the heat exchange performance.

[0045] exist Figure 1In the illustrated embodiment, the thermal management system 100 includes an on-off valve 32. In this embodiment, the on-off valve 32 may be a solenoid valve (SOV), which may realize on-off in the pipeline. The on-off valve 32 is connected between the second inlet 313 and the outlet of the first heat exchanger 1, and is connected between the first inlet 312 and the outlet of the second heat exchanger 2. In this embodiment, the on-off valve 32 is used to control the on-off between the second inlet 313 and the outlet of the first heat exchanger 1, and the on-off between the first inlet 312 and the outlet of the second heat exchanger 2. In this embodiment, it may be set as one on-off valve. In some other embodiments, it may also be set as multiple on-off valves 32, one on-off valve 32 is connected between the second inlet 313 and the outlet of the first heat exchanger 1, and another on-off valve 32 is connected between the first inlet 312 and the outlet of the second heat exchanger 2. In cooling mode and heating mode, the on-off valve 32 is opened. In cooling mode, the on-off valve 32 is opened, so that the outlet of the first heat exchanger 1 is connected to the first inlet 312 and the second inlet 313 respectively. In heating mode, the on-off valve 32 is opened, so that the outlet of the second heat exchanger 2 is connected to the first inlet 312 and the second inlet 313 respectively. In dehumidification mode, the on-off valve 32 is closed, the first heat exchanger 1 is connected to the first flow channel 316, and the second heat exchanger 2 is connected to the second flow channel 317. In this way, when the thermal management system 100 is in dehumidification mode, the outlet of the first heat exchanger 1 is connected to the first inlet 312, and the outlet of the second heat exchanger 2 is connected to the second inlet 313. In this way, it can meet the cooling mode, heating mode and dehumidification mode while saving pipelines and reducing the use of the on-off valve 32.

[0046] exist Figure 1In the illustrated embodiment, the thermal management system 100 includes a first control valve assembly 4 and a second control valve assembly 5. In this embodiment, the first control valve assembly 4 and the second control valve assembly 5 can be three-way switching valves, which can realize the three-way, two-way, and blocked states in the pipeline. In some other embodiments, it can also be set to other numbers, not limited to this. The first control valve assembly 4 is connected between the first inlet 312 and the outlet of the first heat exchanger 1, and is connected between the second inlet 313 and the outlet of the first heat exchanger 1. The first control valve assembly 4 is used to control the on-off of the first inlet 312 and the outlet of the first heat exchanger 1, and the on-off of the second inlet 313 and the outlet of the first heat exchanger 1. The second control valve assembly 5 is connected between the first inlet 312 and the outlet of the second heat exchanger 2, and is connected between the second inlet 313 and the outlet of the second heat exchanger 2, and is used to control the on-off of the first inlet 312 and the outlet of the second heat exchanger 2, and the on-off of the second inlet 313 and the outlet of the second heat exchanger 2. In this embodiment, when in cooling mode, the fluid medium flows through the outlet of the first heat exchanger 1, the first control valve assembly 4 and the first inlet 312 in sequence, and the fluid medium flows through the outlet of the first heat exchanger 1, the first control valve assembly 4 and the second inlet 313 in sequence. When in heating mode, the fluid medium flows through the outlet of the second heat exchanger 2, the second control valve assembly 5 and the first inlet 312 in sequence, and the fluid medium flows through the outlet of the second heat exchanger 2, the second control valve assembly 5 and the second inlet 313 in sequence. When in dehumidification mode, the fluid medium passes through the outlet of the first heat exchanger 1, the first control valve assembly 4 and the first inlet 312 in sequence, and the fluid medium passes through the outlet of the second heat exchanger 2, the second control valve assembly 5 and the second inlet 313 in sequence. Such a configuration facilitates the control of the heat exchanger core 31 through the first control valve assembly 4 and the second control valve assembly 5.

[0047] exist Figure 1In the illustrated embodiment, the thermal management system 100 includes a battery heat exchange branch 110 and a third switching valve assembly 7 for heat exchange of the power battery 200. The battery heat exchange branch 110 is used for heat exchange of the battery. In the present embodiment, the third switching valve assembly 7 may be a multi-way valve for controlling the on-off between multiple branches. The battery heat exchange branch 110 is connected in parallel with the air conditioning heat exchange branch 3. In the present embodiment, the battery heat exchange branch 110 is connected in parallel with the air conditioning heat exchange branch 3 in the cooling mode, the heating mode and the dehumidification mode. The third switching valve assembly 7 includes a cooling connection state and a heating connection state, and the third switching valve assembly 7 can switch between the cooling connection state and the heating connection state. In the present embodiment, the third switching valve assembly 7 has multiple connection ports, and different connection ports are connected to different branches for switching the cooling connection state and the heating connection state. In the cooling connection state, the third switching valve assembly 7 connects the battery heat exchange branch 110 and the first heat exchanger 1. In the cooling mode, the third switching valve assembly 7 is connected to the first heat exchanger 1, thereby realizing cooling of the battery. In the heating connection state, the third switching valve assembly 7 connects the battery heat exchange branch 110 and the second heat exchanger 2. In the heating mode, the third switching valve assembly 7 is connected to the second heat exchanger 2, thereby achieving heating of the power battery 200. In the cooling mode, the third switching valve assembly 7 is in the cooling connection state, and in the heating mode, the third switching valve assembly 7 is in the heating connection state. With such a setting, the connection between different branches can be achieved by switching only one third switching valve assembly 7, so that the switching of different modes can be achieved, the structure is simple, and the switching is convenient.

[0048] Figure 2 FIG. 1 is a schematic diagram of an embodiment of a cooling mode of the thermal management system 100 of the present application. Figure 1 and Figure 2In the illustrated embodiment, the third switching valve assembly 7 includes a first switching inlet 71 and a first switching outlet 72. In the refrigeration connection state, the first switching inlet 71 is connected to one end of the battery heat exchange branch 110, and the first switching outlet 72 is connected to the other end of the battery heat exchange branch 110. The thermal management system 100 also includes a first one-way branch 120. The first one-way branch 120 is used to allow the battery heat exchange branch 110 to form a separate circulation in the refrigeration connection state. The first one-way branch 120 includes a first end 121 and a second end 122, and the one-way conduction direction of the first one-way branch 120 is from the second end 122 to the first end 121. In this embodiment, a first one-way valve 123 is provided on the first one-way branch 120 to control the flow direction and on-off of the first one-way branch 120. The first end 121 of the first one-way branch 120 is connected between the first switching inlet 71 and the outlet of the first heat exchanger 1, and the second end 122 of the first one-way branch 120 is connected between the first switching outlet 72 and the inlet of the first heat exchanger 1. The cooling mode includes an air-conditioning cooling mode alone. In the air-conditioning cooling mode alone, the first one-way branch 120 forms a loop with the battery heat exchange branch 110. In this embodiment, the cooling mode also includes air-conditioning cooling and battery cooling modes. When in the air-conditioning cooling and battery cooling modes, the first one-way branch 120 does not flow. In this embodiment, in the air-conditioning single cooling mode, the outlet of the first heat exchanger 1, the first inlet 312 and the second inlet 313 of the heat exchanger core 31, the first outlet 314 and the second outlet 315 of the heat exchanger core 31, and the inlet of the first heat exchanger 1 are connected in sequence to form a loop. Specifically, the outlet of the first heat exchanger 1, the first inlet 312 of the heat exchanger core 31, the first outlet 314 of the heat exchanger core 31, and the inlet of the first heat exchanger 1 are connected in sequence to form a loop, and the outlet of the first heat exchanger 1, the second inlet 313 of the heat exchanger core 31, the second outlet 315 of the heat exchanger core, and the inlet of the first heat exchanger 1 are connected in sequence to form a loop; and the first end 121 of the first one-way branch 120, the first switching inlet 71 of the third switching valve assembly 7, the inlet of the battery heat exchange branch 110, the outlet of the battery heat exchange branch 110, the first switching outlet 72 of the third switching valve assembly 7, and the second end 122 of the first one-way branch 120 are connected in sequence to form a loop.

[0049] Figure 3 FIG. 1 is a schematic diagram of an embodiment of a heating mode of the thermal management system 100 of the present application. Figure 1 and Figure 3In the illustrated embodiment, the third switching valve assembly 7 includes a second switching inlet 73 and a second switching outlet 74. In the heating connection state, the second switching inlet 73 is connected to one end of the battery heat exchange branch 110, and the second switching outlet 74 is connected to the other end of the battery heat exchange branch 110. The thermal management system 100 also includes a second one-way branch 130. The second one-way branch 130 is used to allow the battery heat exchange branch 110 to form a separate circulation in the heating connection state. The second one-way branch 130 includes a third end 131 and a fourth end 132. The one-way conduction direction of the second one-way branch 130 is from the fourth end 132 to the third end 131. In this embodiment, a second one-way valve 133 is provided on the second one-way branch 130 to control the flow direction and on-off of the second one-way branch 130. The third end 131 of the second one-way branch 130 is connected between the second switching inlet 73 and the outlet of the second heat exchanger 2, and the fourth end 132 of the second one-way branch 130 is connected between the second switching outlet 74 and the inlet of the second heat exchanger 2. The heating mode includes the air conditioning heating mode alone. In the air conditioning heating mode alone, the second one-way branch 130 forms a loop with the battery heat exchange branch 110. In this embodiment, the cooling mode also includes the air conditioning heating and battery heating modes. When in the air conditioning heating and battery heating modes, the second one-way branch 130 does not flow. In this embodiment, in the air-conditioning single heating mode, the outlet of the second heat exchanger 2, the first inlet 312 and the second inlet 313 of the heat exchanger core 31, the first outlet 314 and the second outlet 315 of the heat exchanger core 31, and the inlet of the second heat exchanger 2 are connected in sequence to form a loop. Specifically, the outlet of the second heat exchanger 2, the first inlet 312 of the heat exchanger core 31, the first outlet 314 of the heat exchanger core 31, and the inlet of the second heat exchanger 2 are connected in sequence to form a loop, and the outlet of the second heat exchanger 2, the second inlet 313 of the heat exchanger core 31, the second outlet 315 of the heat exchanger core 31, and the inlet of the second heat exchanger 2 are connected in sequence to form a loop; and the third end 131 of the second one-way branch 130, the second switching inlet 73 of the third switching valve assembly 7, the inlet of the battery heat exchange branch 110, the outlet of the battery heat exchange branch 110, the second switching outlet 74 of the third switching valve assembly 7, and the fourth end 132 of the second one-way branch 130 are connected in sequence to form a loop.

[0050] Look back Figure 1In the embodiment shown, the thermal management system 100 includes a motor heat exchange branch 140 for exchanging heat for the power motor 300. The motor heat exchange branch 140 includes a radiator 141, and the motor heat exchange branch 140 passes through the power motor 300. The motor heat exchange branch 140 is used to dissipate heat for the power motor 300. The third switching valve assembly 7 includes a first motor heat dissipation state and a second motor heat dissipation state, and the third switching valve assembly 7 can switch between the first motor heat dissipation state and the second motor heat dissipation state. In this embodiment, when in the cooling mode, the third switching valve assembly 7 is in the first motor heat dissipation state. When in the heating mode, the third switching valve assembly 7 is in the second motor heat dissipation state. In the first motor heat dissipation state, the third switching valve assembly 7 connects the motor heat exchange branch 140 and the second heat exchanger 2, and in the second motor heat dissipation state, the third switching valve assembly 7 connects the motor heat exchange branch 140 and the first heat exchanger 1. In the first heat dissipation state of the motor, the outlet of the second heat exchanger 2, the third switching valve assembly 7, the motor heat exchange branch 140, and the inlet of the second heat exchanger 2 are connected in sequence to form a loop. In this state, the power motor 300 dissipates heat through the radiator 141 of the motor heat exchange branch 140. In the second heat dissipation state of the motor, the outlet of the first heat exchanger 1, the third switching valve assembly 7, the motor heat exchange branch 140, and the inlet of the first heat exchanger 1 are connected in sequence to form a loop. In this state, the power motor 300 dissipates heat through the first heat exchanger 1. With such a configuration, when the thermal management system 100 is in cooling mode or heating mode, the power motor 300 can be in different heat dissipation states in different modes. While ensuring normal heat dissipation of the motor, the circuit is simple and easy to operate.

[0051] exist Figure 1 In the illustrated embodiment, the motor heat exchange branch 140 includes a motor heat exchange sub-branch 142 connected between the outlet of the radiator 141 and the third switching valve assembly 7. The motor heat exchange sub-branch 142 is used to exchange heat for the power motor 300. The motor heat exchange sub-branch 142 passes through the power motor 300. The thermal management system 100 includes a shunt branch 150. The shunt branch 150 is used for shunting. The shunt branch 150 is provided with a flow control valve 151, one end of the shunt branch 150 is connected between the motor heat exchange sub-branch 142 and the outlet of the radiator 141, and the other end of the shunt branch 150 is connected between the third switching valve assembly 7 and the inlet of the second heat exchanger 2. When the heat dissipation required by the power motor 300 is small, the opening of the flow control valve 151 is increased to ensure that less fluid medium passes through the motor heat exchange sub-branch 142. When the heat dissipation required by the power motor 300 is large, the opening of the flow control valve 151 is decreased to ensure that more fluid medium passes through the motor heat exchange sub-branch 142.

[0052] exist Figure 1In the illustrated embodiment, the thermal management system 100 further includes an expansion valve 81. In the present embodiment, the expansion valve 81 (BEXV) is used to expand the refrigerant medium. The first heat exchanger 1, the compressor 8, the second heat exchanger 2 and the expansion valve 81 are connected in sequence. In the present embodiment, the loop formed by the first heat exchanger 1, the compressor 8, the second heat exchanger 2 and the expansion valve 81 is used to pass the refrigerant medium. The thermal management system 100 includes a liquid storage tank 82. The liquid storage tank 82 is used to store refrigerant. The liquid storage tank 82 is connected between the second heat exchanger 2 and the expansion valve 81. When the power motor 300 and the power battery 200 are in a low-load operating state, part of the refrigerant can be stored through the liquid storage tank 82. When the power motor 300 and the power battery 200 are in a high-load operating state, part of the refrigerant can be released through the liquid storage tank 82, so that it can adapt to different operating states and has wide applicability. The thermal management system 100 includes a first filling port 83. The first filling port 83 is used to fill the refrigerant. The first filling port 83 is provided between the second heat exchanger 2 and the expansion valve 81. When there is a lack of refrigerant between the second heat exchanger 2 and the expansion valve 81, refrigerant is added through the first filling port 83. The thermal management system 100 includes a second filling port 84, which is provided between the first heat exchanger 1 and the compressor 8. When there is a lack of refrigerant between the first heat exchanger 1 and the compressor 8, refrigerant is added through the second filling port 84. The thermal management system 100 includes a first temperature and pressure sensor 85, which is provided between the first heat exchanger 1 and the compressor 8. The first temperature and pressure sensor 85 is used to detect the temperature and pressure of the inlet of the compressor 8. In this way, the safe operation of the compressor 8 is ensured. The first temperature and pressure sensor 85 can also be provided at other positions in the circuit of the thermal management system, but is not limited thereto. The thermal management system 100 includes a second temperature and pressure sensor 86, which is provided between the compressor 8 and the second heat exchanger 2. The second temperature and pressure sensor 86 is used to detect the temperature and pressure of the outlet of the compressor 8. In this way, the safe operation of the compressor 8 is ensured. The thermal management system 100 includes a muffler 87, which is disposed between the compressor 8 and the second heat exchanger 2. The muffler 87 is used to eliminate the noise of the compressor 8. This arrangement ensures that the thermal management system 100 reduces noise. The thermal management system 100 also includes a plurality of water pumps 88, which can be disposed at the inlet of the first heat exchanger 1, the battery heat exchange branch 110, the inlet of the second heat exchanger 2, and the motor heat exchange branch 140.

[0053] According to the above features, the thermal management system 100 may include cooling mode, heating mode and dehumidification mode operations.

[0054] exist Figure 2In the illustrated embodiment, cooling mode: when in this mode, the third switching valve assembly 7 switches to the first switching inlet 71 to communicate with one end of the battery heat exchange branch 110, and the first switching outlet 72 is connected to the other end of the battery heat exchange branch 110. The cooling mode includes air conditioning cooling and battery cooling modes. Specifically, in the air conditioning cooling and battery cooling modes, the fluid medium passes through the outlet of the first heat exchanger 1, the first control valve assembly 4, the first inlet 312 and the second inlet 313 of the heat exchanger core 31, the first outlet 314 and the second outlet 315 of the heat exchanger core 31, the water pump 88, and the inlet of the first heat exchanger 1. More specifically, the fluid medium passes through the outlet of the first heat exchanger 1, the first control valve assembly 4, the first inlet 312 and the second inlet 313 of the heat exchanger core 31, the first outlet 314 and the second outlet 315 of the heat exchanger core 31, the water pump 88, and the inlet of the first heat exchanger 1. 8, the inlet of the first heat exchanger 1, and the fluid medium sequentially passes through the outlet of the first heat exchanger 1, the first control valve assembly 4, the second inlet 313 of the heat exchanger core 31, the second outlet 315 of the heat exchanger core 31, the water pump 88, the inlet of the first heat exchanger 1; and also sequentially passes through the outlet of the first heat exchanger 1, the first control valve assembly 4, the first switching inlet 71 of the third switching valve assembly 7, the water pump 88, the power battery 200, the first switching outlet 72 of the third switching valve assembly 7, the water pump 88, and the inlet of the first heat exchanger 1. The cooling mode also includes an air conditioning single cooling mode. Specifically, in the air-conditioning single cooling mode, the fluid medium passes through the outlet of the first heat exchanger 1, the first control valve assembly 4, the first inlet 312 and the second inlet 313 of the heat exchanger core 31, the first outlet 314 and the second outlet 315 of the heat exchanger core 31, the water pump 88, and the inlet of the first heat exchanger 1 in sequence. More specifically, in the air-conditioning single cooling mode, the fluid medium passes through the outlet of the first heat exchanger 1, the first control valve assembly 4, the first inlet 312 of the heat exchanger core 31, the first outlet 314 of the heat exchanger core 31, the water pump 88, and the inlet of the first heat exchanger 1 in sequence, and in the air-conditioning single cooling mode, The fluid medium passes through the outlet of the first heat exchanger 1, the first control valve assembly 4, the second inlet 313 of the heat exchanger core 31, the second outlet 315 of the heat exchanger core 31, the water pump 88, and the inlet of the first heat exchanger 1 in sequence; the fluid medium also passes through the first end 121 of the first one-way branch 120, the first switching inlet 71 of the third switching valve assembly 7, the water pump 88, the power battery 200, the first switching outlet 72 of the third switching valve assembly 7, and the second end 122 of the first one-way branch 120 in sequence, so that the battery circuit forms a separate cycle, and in the air conditioning single cooling mode, there is no need to cool the power battery 200. In the cooling mode, when the power motor 300 dissipates heat, the third switching valve assembly 7 includes the first heat dissipation state of the motor, and the third switching valve assembly 7 connects the motor heat exchange branch 140 and the second heat exchanger 2.Specifically, the fluid medium passes through the outlet of the second heat exchanger 2, the third switching valve assembly 7, the motor heat exchange branch 140, and the inlet of the second heat exchanger 2 in sequence, and the power motor 300 dissipates heat through the radiator 141 of the motor heat exchange branch 140. When the fluid medium passes through the motor heat exchange branch 140, it is also divided into two paths, one of which passes through the radiator 141 and enters the motor heat exchange sub-branch 142, and the other passes through the radiator 141 and enters the shunt branch 150. When the heat dissipation of the power motor 300 is large, the opening of the flow control valve 151 set in the shunt branch 150 is reduced, and when the heat dissipation of the power motor 300 is small, the opening of the flow control valve 151 set in the shunt branch 150 is increased.

[0055] exist Figure 3In the illustrated embodiment, heating mode: when in this mode, the third switching valve assembly 7 switches to the second switching inlet 73 to communicate with one end of the battery heat exchange branch 110, and the second switching outlet 74 is connected to the other end of the battery heat exchange branch 110. The heating mode includes air conditioning heating and battery heating modes. Specifically, in the air conditioning heating and battery heating modes, the fluid medium passes through the outlet of the second heat exchanger 2, the second control valve assembly 5, the first inlet 312 and the second inlet 313 of the heat exchanger core 31, the first outlet 314 and the second outlet 315 of the heat exchanger core 31, the water pump 88, and the inlet of the second heat exchanger 2. More specifically, in the air conditioning heating and battery heating modes, the fluid medium passes through the outlet of the second heat exchanger 2, the second control valve assembly 5, the first inlet 312 and the second inlet 313 of the heat exchanger core 31, the first outlet 314 and the second outlet 315 of the heat exchanger core 31, the water pump 88, and the inlet of the second heat exchanger 2. 8, the inlet of the second heat exchanger 2, and in the air conditioning heating and battery heating modes, the fluid medium sequentially passes through the outlet of the second heat exchanger 2, the second control valve assembly 5, the second inlet 313 of the heat exchanger core 31, the second outlet 315 of the heat exchanger core 31, the water pump 88, and the inlet of the second heat exchanger 2; and also sequentially passes through the outlet of the second heat exchanger 2, the second control valve assembly 5, the second switching inlet 73 of the third switching valve assembly 7, the water pump 88, the power battery 200, the second switching outlet 74 of the third switching valve assembly 7, the water pump 88, and the inlet of the second heat exchanger 2. The heating mode also includes the air conditioning heating mode alone. Specifically, in the air-conditioning heating mode alone, the fluid medium passes through the outlet of the second heat exchanger 2, the second control valve assembly 5, the first inlet 312 and the second inlet 313 of the heat exchanger core 31, the first outlet 314 and the second outlet 315 of the heat exchanger core 31, the water pump 88, and the inlet of the second heat exchanger 2 in sequence. More specifically, in the air-conditioning heating mode alone, the fluid medium passes through the outlet of the second heat exchanger 2, the second control valve assembly 5, the first inlet 312 of the heat exchanger core 31, the first outlet 314 of the heat exchanger core 31, the water pump 88, and the inlet of the second heat exchanger 2 in sequence, and in the air-conditioning heating mode alone, The fluid medium passes through the outlet of the second heat exchanger 2, the second control valve assembly 5, the second inlet 313 of the heat exchanger core 31, the second outlet 315 of the heat exchanger core 31, the water pump 88, and the inlet of the second heat exchanger 2 in sequence; the fluid medium also passes through the third end 131 of the second one-way branch 130, the second switching inlet 73 of the third switching valve assembly 7, the water pump 88, the power battery 200, the second switching outlet 74 of the third switching valve assembly 7, and the fourth end 132 of the second one-way branch 130 in sequence, so that the battery circuit forms a separate cycle, and in the air conditioning separate heating mode, there is no need to heat the power battery 200. In the heating mode, when the power motor 300 dissipates heat, the third switching valve assembly 7 includes the second heat dissipation state of the motor, and the third switching valve assembly 7 connects the motor heat exchange branch 140 and the first heat exchanger 1.Specifically, the fluid medium passes through the outlet of the first heat exchanger 1, the third switching valve assembly 7, the motor heat exchange branch 140, and the inlet of the first heat exchanger 1 in sequence, and the power motor 300 dissipates heat through the first heat exchanger 1. When the fluid medium passes through the motor heat exchange branch 140, it is also divided into two paths, one of which passes through the radiator 141 and enters the motor heat exchange sub-branch 142, and the other passes through the radiator 141 and enters the shunt branch 150. When the heat dissipation of the power motor 300 is large, the opening of the flow control valve 151 provided in the shunt branch 150 is reduced, and when the heat dissipation of the power motor 300 is small, the opening of the flow control valve 151 provided in the shunt branch 150 is increased.

[0056] Figure 4 FIG. 1 is a schematic diagram of an embodiment of a dehumidification mode of the thermal management system 100 of the present application. Figure 4 In the embodiment shown, dehumidification mode: when in this mode, the third switching valve assembly 7 switches to the first switching inlet 71 to communicate with one end of the battery heat exchange branch 110, the first switching outlet 72 is connected to the other end of the battery heat exchange branch 110, and the on-off valve 32 is closed. Specifically, the dehumidification mode includes that the fluid medium sequentially passes through the outlet of the first heat exchanger 1, the first control valve assembly 4, the first inlet 312 of the heat exchanger core 31, the first outlet 314 of the heat exchanger core 31, the water pump 88, and the inlet of the first heat exchanger 1; and also sequentially passes through the outlet of the first heat exchanger 1, the first control valve assembly 4, the first switching inlet 71 of the third switching valve assembly 7, the water pump 88, the power battery 200, the first switching outlet 72 of the third switching valve assembly 7, the water pump 88, and the inlet of the first heat exchanger 1. The fluid medium sequentially passes through the outlet of the second heat exchanger 2, the second control valve assembly 5, the second inlet 313 of the heat exchanger core 31, the second outlet 315 of the heat exchanger core 31, the water pump 88, and the inlet of the second heat exchanger 2. In the dehumidification mode, the heat dissipation of the power motor 300 is similar to that in the cooling mode, which will not be repeated here.

[0057] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A thermal management system, characterized in that: include: A first heat exchanger, a second heat exchanger, a compressor and an air conditioning heat exchange branch, wherein the first heat exchanger and the second heat exchanger are connected via the compressor, the air conditioning heat exchange branch comprises a heat exchanger core, the heat exchanger core comprises a shell component, a first inlet, a second inlet, a first outlet, a second outlet, a first flow channel connecting the first inlet and the first outlet, and a second flow channel connecting the second inlet and the second outlet, the first inlet, the first outlet, the second inlet and the second outlet are located in the same shell component, and the first flow channel and the second flow channel are arranged in the same shell component; The first flow channel is in communication with the first heat exchanger or the second heat exchanger, and the second flow channel is in communication with the first heat exchanger or the second heat exchanger.

2. The thermal management system according to claim 1, characterized in that: The first inlet and the second inlet are respectively connected to the outlet of the first heat exchanger, and the first outlet and the second outlet are respectively connected to the inlet of the first heat exchanger. In cooling mode, the first flow channel is connected in parallel with the second flow channel and communicates with the first heat exchanger. The first inlet and the second inlet are respectively connected to the outlet of the second heat exchanger, and the first outlet and the second outlet are respectively connected to the inlet of the second heat exchanger. In heating mode, the first flow channel is connected in parallel with the second flow channel and communicates with the second heat exchanger.

3. The thermal management system according to claim 2, characterized in that: The thermal management system includes an on-off valve connected between the second inlet and the outlet of the first heat exchanger, and connected between the first inlet and the outlet of the second heat exchanger; In cooling mode and heating mode, the on-off valve is opened; in dehumidification mode, the on-off valve is closed, the first heat exchanger is connected to the first flow channel, and the second heat exchanger is connected to the second flow channel.

4. The thermal management system according to claim 1, characterized in that: The thermal management system includes a first control valve assembly, which is connected between the first inlet and the outlet of the first heat exchanger, and between the second inlet and the outlet of the first heat exchanger, and is used to control the opening and closing of the first inlet and the outlet of the first heat exchanger, and the opening and closing of the second inlet and the outlet of the first heat exchanger; and / or, The thermal management system includes a second control valve assembly, which is connected between the first inlet and the outlet of the second heat exchanger, and between the second inlet and the outlet of the second heat exchanger, and is used to control the opening and closing of the first inlet and the outlet of the second heat exchanger, and the opening and closing of the second inlet and the outlet of the second heat exchanger.

5. The thermal management system according to claim 2, characterized in that: The thermal management system comprises a battery heat exchange branch for exchanging heat for the power battery and a third switching valve assembly, wherein the battery heat exchange branch is connected in parallel with the air conditioning heat exchange branch; The third switching valve assembly includes a cooling connection state and a heating connection state, and the third switching valve assembly can be switched between the cooling connection state and the heating connection state; in the cooling connection state, the third switching valve assembly connects the battery heat exchange branch and the first heat exchanger, and in the heating connection state, the third switching valve assembly connects the battery heat exchange branch and the second heat exchanger; In the cooling mode, the third switching valve assembly is in the cooling communication state, and in the heating mode, the third switching valve assembly is in the heating communication state.

6. The thermal management system according to claim 5, characterized in that: The third switching valve assembly includes a first switching inlet and a first switching outlet. In the refrigeration connection state, the first switching inlet is connected to one end of the battery heat exchange branch, and the first switching outlet is connected to the other end of the battery heat exchange branch.

7. The thermal management system according to claim 6, characterized in that: The thermal management system further includes a first one-way branch, the first one-way branch includes a first end and a second end, the one-way conduction direction of the first one-way branch is from the second end to the first end, the first end of the first one-way branch is connected between the first switching inlet and the outlet of the first heat exchanger, and the second end of the first one-way branch is connected between the first switching outlet and the inlet of the first heat exchanger; The cooling mode includes an air-conditioning-only cooling mode; in the air-conditioning-only cooling mode, the first unidirectional branch and the battery heat exchange branch form a loop.

8. The thermal management system according to claim 5, characterized in that: The third switching valve assembly includes a second switching inlet and a second switching outlet. In the heating connection state, the second switching inlet is connected to one end of the battery heat exchange branch, and the second switching outlet is connected to the other end of the battery heat exchange branch.

9. The thermal management system according to claim 8, characterized in that: The thermal management system further includes a second one-way branch, the second one-way branch includes a third end and a fourth end, the one-way conduction direction of the second one-way branch is from the fourth end to the third end, the third end of the second one-way branch is connected between the second switching inlet and the outlet of the second heat exchanger, and the fourth end of the second one-way branch is connected between the second switching outlet and the inlet of the second heat exchanger; The heating mode includes an air-conditioning-only heating mode. In the air-conditioning-only heating mode, the second unidirectional branch forms a loop with the battery heat exchange branch.

10. The thermal management system according to claim 1, characterized in that: The thermal management system comprises a motor heat exchange branch for exchanging heat for the power motor and a third switching valve assembly, wherein the motor heat exchange branch comprises a radiator and passes through the power motor; The third switching valve assembly includes a first heat dissipation state of the motor and a second heat dissipation state of the motor, and the third switching valve assembly can be switched between the first heat dissipation state of the motor and the second heat dissipation state of the motor; In the first heat dissipation state of the motor, the third switching valve assembly connects the motor heat dissipation branch and the second heat exchanger. In the second heat dissipation state of the motor, the third switching valve assembly connects the motor heat exchange branch and the first heat exchanger.

11. The thermal management system according to claim 10, characterized in that: The motor heat exchange branch includes a motor heat exchange sub-branch connected between the outlet of the radiator and the third switching valve assembly, and the motor heat exchange sub-branch passes through the power motor; The thermal management system includes a shunt branch, which is provided with a flow control valve. One end of the shunt branch is connected between the motor heat exchange sub-branch and the outlet of the radiator, and the other end of the shunt branch is connected between the third switching valve assembly and the inlet of the second heat exchanger.

12. The thermal management system according to claim 1, characterized in that: The thermal management system further includes an expansion valve, wherein the first heat exchanger, the compressor, the second heat exchanger and the expansion valve are sequentially connected; The thermal management system comprises a liquid storage tank connected between the second heat exchanger and the expansion valve; and / or The thermal management system comprises a first filling port, wherein the first filling port is arranged between the second heat exchanger and the expansion valve; and / or The thermal management system comprises a second filling port, wherein the second filling port is arranged between the first heat exchanger and the compressor; and / or The thermal management system comprises a first temperature and pressure sensor, wherein the first temperature and pressure sensor is arranged between the first heat exchanger and the compressor; and / or The thermal management system includes a second temperature and pressure sensor, wherein the second temperature and pressure sensor is disposed between the compressor and the second heat exchanger; and / or The thermal management system includes a muffler disposed between the compressor and the second heat exchanger.

13. A vehicle, characterized in that: include: A power battery, a power motor and a thermal management system as described in any one of claims 1-12, wherein the thermal management system passes through the power battery to exchange heat for the power battery, and the thermal management system passes through the power motor to dissipate heat for the power motor.

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