Thermal management system, thermal management system control method and device, vehicle and medium

Abstract

The embodiment of the invention provides a thermal management system, a thermal management system control method and device, a vehicle and a medium. The thermal management system comprises a power device cooling liquid circulation branch and a refrigerant loop, and the power device cooling liquid circulation branch is a cooling liquid circulation branch; the power device cooling liquid circulation branch comprises a first outdoor heat exchanger; the power device cooling liquid circulation branch and the refrigerant loop achieve heat exchange through a water-cooling heat exchanger, and a cooling liquid flow channel outlet of the water-cooling heat exchanger communicates with a cooling liquid flow channel inlet of the first outdoor heat exchanger. Due to the fact that an external air heat exchanger used for heat dissipation of the refrigerant loop does not need to be arranged, and only a water-cooling heat exchanger small in size needs to be arranged, the scheme can solve the problem that under the condition that the external space of the vehicle is limited, heat dissipation of the refrigerant loop is not needed. And an external air heat exchanger in a cooling liquid circulation branch of the power device and an external air heat exchanger in heat exchange of a refrigerant loop are difficult to reasonably arrange.

Description

Technical Field

[0001] The present disclosure relates to the field of thermal management technology, and specifically provides a thermal management system, a thermal management system control method, a device, a vehicle, and a medium. Background Art

[0002] In order to meet the cooling or heating needs of batteries, power units and crew cabins in electric vehicles, relevant technologies propose to deploy a battery thermal management circuit, a power unit thermal management circuit and a refrigerant circuit for thermal management of the passenger cabin in the vehicle. The refrigerant circuit can be coupled with the battery thermal management circuit. While using the refrigerant circuit to achieve thermal management of the passenger cabin, it can also achieve thermal management of the battery management system in some working modes; while the power unit thermal management circuit is independent of the refrigerant circuit and the battery thermal management circuit. Since the power unit thermal management circuit is independent of the refrigerant circuit and the battery management circuit, it is necessary to set up larger external air heat exchangers in the power unit thermal management circuit and the refrigerant circuit respectively. In the case of limited external space in the vehicle, it becomes a difficult problem to reasonably arrange two external air heat exchangers. Summary of the invention

[0003] In order to solve the above technical problems, the embodiments of the present disclosure provide a thermal management system, a thermal management system control method, a device, a vehicle and a medium.

[0004] In a first aspect, an embodiment of the present disclosure provides a thermal management system, including a power device coolant circulation branch and a refrigerant circuit, wherein the power device coolant circulation branch is a coolant circulation branch;

[0005] The power unit coolant circulation branch includes a first outdoor heat exchanger;

[0006] The coolant circulation branch of the power unit is coupled to the refrigerant circuit via a water-cooled heat exchanger, and the coolant flow channel outlet of the water-cooled heat exchanger is connected to the coolant flow channel inlet of the first outdoor heat exchanger.

[0007] Optionally, the thermal management system further includes a battery coolant circulation branch, the battery coolant circulation branch is a coolant circulation branch, and the battery coolant circulation branch includes a battery cooler;

[0008] The coolant circulation branch is coupled to the refrigerant circuit through the battery cooler.

[0009] Optionally, the refrigerant circuit further includes an evaporator;

[0010] The refrigerant flow passage of the evaporator is connected in parallel with the refrigerant flow passage of the battery cooler.

[0011] Optionally, the refrigerant circuit further includes a second outdoor heat exchanger;

[0012] The refrigerant flow channel of the second outdoor heat exchanger is connected in series with the refrigerant flow channel of the water-cooled heat exchanger.

[0013] Optionally, the second outdoor heat exchanger is connected in series with the water-cooled heat exchanger, specifically:

[0014] The refrigerant flow channel inlet of the second outdoor heat exchanger is communicated with the refrigerant flow channel outlet of the water-cooled heat exchanger.

[0015] Optionally, the refrigerant circuit further includes a first expansion valve;

[0016] The refrigerant flow channel inlet of the second outdoor heat exchanger is connected to the refrigerant flow channel outlet of the water-cooled heat exchanger through the first expansion valve.

[0017] Optionally, the refrigerant circuit further includes a bypass valve;

[0018] The bypass valve is connected in parallel with the second outdoor heat exchanger and is used to bypass the second outdoor heat exchanger in at least one operating mode.

[0019] Optionally, the refrigerant circuit further includes a condenser;

[0020] The refrigerant flow channel outlet of the condenser is communicated with the refrigerant flow channel inlet of the water-cooled heat exchanger.

[0021] Optionally, the power unit coolant circulation branch further includes a first three-way valve and a four-way valve;

[0022] The first port of the first three-way valve is communicated with the coolant flow channel outlet of the first outdoor heat exchanger, and the second port of the first three-way valve is communicated with the coolant flow channel outlet of the water-cooled heat exchanger, and the first three-way valve is used to bypass the first outdoor heat exchanger in the target working mode;

[0023] The first port of the four-way valve is connected to the third port of the first three-way valve, and the second port and the third port of the four-way valve are connected to the battery coolant circulation branch, which is used to connect the battery coolant circulation branch and the power unit coolant circulation branch in series to form a coolant circulation loop in the target operating mode.

[0024] Optionally, the battery coolant circulation branch further includes a second three-way valve and a battery heat exchanger;

[0025] The first port of the second three-way valve is connected to the refrigerant flow outlet of the battery cooler, the second port of the second three-way valve is connected to the refrigerant flow outlet of the battery heat exchanger, and the third port of the second three-way valve is connected to the fourth port of the four-way valve, for bypassing the battery heat exchanger in at least one operating mode.

[0026] Optionally, the battery coolant circulation branch further includes an electric heater;

[0027] The electric heater is connected in series with the battery cooler and is used to electrically heat the coolant flowing through the battery coolant circulation branch in at least one working mode.

[0028] In a second aspect, an embodiment of the present disclosure further provides a control method for a thermal management system, which is applied to a thermal management system, comprising a power device coolant circulation branch and a refrigerant circuit; the power device coolant circulation branch comprises a first outdoor heat exchanger; the power device coolant circulation branch and the refrigerant circuit are coupled through a water-cooled heat exchanger, and the coolant flow channel outlet of the water-cooled heat exchanger is connected to the coolant flow channel inlet of the first outdoor heat exchanger;

[0029] The method includes: in a target working mode, controlling the refrigerant in the refrigerant circuit to release heat at the water-cooled heat exchanger, so that at least part of the heat carried by the high-temperature and high-pressure refrigerant compressed by the refrigerant circuit is dissipated into the air through the first outdoor heat exchanger.

[0030] Optionally, the thermal management system further includes a battery coolant circulation branch, and the battery coolant circulation branch includes a battery cooler; the battery coolant circulation branch is coupled to the refrigerant circuit through the battery cooler;

[0031] The method further includes: in the target operating mode, controlling the refrigerant in the refrigerant circuit to evaporate and absorb heat at the battery cooler, and the target operating mode includes a combined cooling mode and a battery cooling mode.

[0032] Optionally, the refrigerant circuit further includes a second outdoor heat exchanger; the refrigerant flow channel of the second outdoor heat exchanger is connected in series with the refrigerant flow channel of the water-cooled heat exchanger;

[0033] The method further includes: in the target working mode, controlling the refrigerant in the refrigerant circuit to dissipate heat at the second outdoor heat exchanger, so that at least part of the heat carried by the refrigerant in the refrigerant circuit is dissipated into the air through the second outdoor heat exchanger.

[0034] In a third aspect, an embodiment of the present disclosure provides a control device, including a processor and a memory, wherein the memory is used to store a computer program; when the computer program is loaded by the processor, the processor executes the control method of the thermal management system as described above.

[0035] In a fourth aspect, an embodiment of the present disclosure provides a computer-readable storage medium, wherein the storage medium stores a computer program. When the computer program is executed by a processor, the processor implements the control method of the thermal management system as described above.

[0036] In a fifth aspect, an embodiment of the present disclosure also provides a vehicle, comprising a thermal management system as described above.

[0037] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0038] By adopting the solution provided by the embodiment of the present disclosure, by using a water-cooled heat exchanger to couple the coolant circulation branch of the power unit and the refrigerant circuit for heat exchange, it is possible to use the first outdoor heat exchanger to dissipate the heat enriched in the refrigerant circuit into the air, without the need to set up an external air heat exchanger for heat dissipation of the refrigerant circuit. Since the specific heat capacity of the coolant is greater than the specific heat capacity of the air, and the heat conduction efficiency of the coolant is greater than the heat conduction efficiency of the air, the water-cooled heat exchanger can be set to a smaller size and still meet the heat dissipation efficiency requirements of the battery cooling mode. Since there is no need to set up an external air heat exchanger for heat dissipation of the refrigerant circuit, only a smaller water-cooled heat exchanger is needed. The solution provided by the embodiment of the present disclosure can solve the problem of difficulty in reasonably arranging the external air heat exchanger in the coolant circulation branch of the power unit and the external air heat exchanger in the refrigerant circuit heat exchange when the vehicle's external space is limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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.

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor, among which:

[0041] Figure 1 is a schematic diagram of the structure of a thermal management system provided by an embodiment of the present disclosure;

[0042] Figure 2 is a schematic diagram of the structure of a thermal management system provided by some other embodiments of the present disclosure;

[0043] Figure 3 is a schematic diagram of the structure of a thermal management system provided by some other embodiments of the present disclosure;

[0044] Figure 4 is a schematic diagram of the cyclic operation of the thermal management system in the battery cooling mode in some embodiments;

[0045] Figure 5 is a schematic diagram of the cycle operation of the thermal management system in a cabin cooling mode in some embodiments;

[0046] Figure 6 Schematic diagram of the cycle operation of the thermal management system in the combined cooling mode in some embodiments

[0047] Figure 7 is a schematic diagram of the cycle operation of the thermal management system in a cabin heating mode in some embodiments;

[0048] Figure 8 is a schematic diagram of the cyclic operation of the thermal management system in the waste heat recovery mode in some embodiments;

[0049] Fig. 9 is a schematic diagram of the cyclic operation of the thermal management system in the first ultra-low temperature heating mode in some embodiments;

[0050] Fig.10 is a schematic diagram of the cyclic operation of the thermal management system in the second ultra-low temperature heating mode in some embodiments;

[0051] Fig.11 is a schematic diagram of the cyclic operation of the thermal management system in a single steam dehumidification mode in some embodiments;

[0052] Fig.12 is a schematic diagram of the cycle operation of the thermal management system in the double steam mode in some embodiments;

[0053] Fig.13 It is a structural diagram of a control device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0054] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0055] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0056] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0057] In order to solve the problem that the thermal management circuit of the power unit in existing vehicles is independent of the refrigerant circuit, and the external air heat exchangers of the thermal management circuit of the power unit and the refrigerant circuit need to be reasonably arranged, an embodiment of the present disclosure provides a new thermal management system.

[0058] Figure 1 Schematic diagram of the structure of the thermal management system provided by the embodiment of the present disclosure. Figure 1 As shown, the thermal management system provided by the embodiment of the present disclosure includes a power device coolant circulation branch 100 and a refrigerant circuit 200.

[0059] The power unit coolant circulation branch 100 is a branch for thermal management of the power unit. In the embodiment of the present disclosure, the power unit coolant circulation branch 100 is a coolant circulation flow branch. Please note that the present disclosure embodiment describes the "power unit coolant circulation branch" as a branch. In a specific implementation, the power unit coolant circulation branch 100 can be an independent coolant circulation loop, or it can be part of a large coolant circulation loop (that is, as part of a circulation loop). Whether the power unit coolant circulation branch 100 is an independent coolant circulation loop or part of a large coolant circulation loop will be specifically explained in the working mode analysis later.

[0060] See also Figure 1 The power unit coolant circulation branch 100 includes a water-cooled heat exchanger 101, a first outdoor heat exchanger 102, a first water pump 103, a power unit heat exchanger and a water-cooled heat exchanger 101 connected in series, wherein the power unit heat exchanger may include a first sub-heat exchanger 104 disposed in a motor controller and a second sub-heat exchanger 105 disposed in a drive motor. Driven by the first water pump 103, the coolant may circulate among the water-cooled heat exchanger 101, the first outdoor heat exchanger 102 and the power unit heat exchanger to achieve thermal management of the power unit. In addition, in order to improve the heat exchange efficiency at the first outdoor heat exchanger 102, the power unit coolant circulation branch 100 may also include a guide fan disposed at the first outdoor heat exchanger 102.

[0061] It should be noted that in certain working modes, although the coolant in the power device coolant circulation branch 100 circulates, the circulation of the coolant is not for achieving thermal management of the power device, that is, it is not for heat exchange at the first sub-heat exchanger 104 and the second sub-heat exchanger 105, but for achieving other functions. For the corresponding content, please pay attention to the analysis of the working mode in the following text.

[0062] The refrigerant circuit is a circuit that achieves thermal management of the target equipment by changing the gas-liquid state and pressure state of the refrigerant and utilizing the heat absorption and heat release characteristics generated by the change in the gas-liquid state and pressure state of the refrigerant. As the name and the above explanation show, the refrigerant circuit is a circuit in which the refrigerant circulates.

[0063] See also Figure 1 , the refrigerant circuit 200 includes a compressor 201, a water-cooled heat exchanger 101, an evaporator throttle valve 202, a refrigerant evaporator 203 and a gas-liquid separator 204. When the compressor 201 is working, the refrigerant circulates between the water-cooled heat exchanger 101, the refrigerant evaporator 203 and the gas-liquid separator 204 to achieve heat exchange. Specifically, the gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant when passing through the compressor 201, and then the high-temperature and high-pressure gaseous refrigerant flows through the water-cooled heat exchanger 101 to dissipate heat and become a medium-temperature and high-pressure liquid refrigerant; then, the medium-temperature and high-pressure liquid refrigerant is throttled to a low-temperature and low-pressure liquid refrigerant under the throttling effect of the throttle valve 202 and flows through the refrigerant evaporator 203, and evaporates and absorbs heat at the refrigerant evaporator 203 to become a low-temperature and low-pressure gas-liquid mixed refrigerant; the low-temperature and low-pressure gas-liquid mixed refrigerant flows back to the gas-liquid separator 204 for gas-liquid separation, and the gaseous refrigerant flows back to the compressor 201 to complete a cycle.

[0064] It should be noted that the aforementioned high-temperature and high-pressure gaseous refrigerant, medium-temperature and high-pressure liquid refrigerant, low-temperature and low-pressure liquid refrigerant, and low-temperature and low-pressure gas-liquid mixed refrigerant are refrigerant states under ideal conditions. In actual applications, due to environmental characteristics or limitations on the working characteristics of the refrigerant circuit 200, the refrigerant may not be able to fully reach the aforementioned ideal state, but it does not affect the realization of the functions of the refrigerant circuit 200 under various working modes.

[0065] Combined with the analysis of the power device coolant circulation branch 100 and the refrigerant circuit 200 in the thermal management system, it can be seen that the power device coolant circulation branch 100 and the refrigerant circuit 200 share the water-cooled heat exchanger 101. In other words, the power device coolant circulation branch 100 and the refrigerant circuit 200 achieve heat exchange through the water-cooled heat exchanger 101.

[0066] Using the thermal management system provided by the embodiment of the present disclosure, in certain working modes, the low-temperature and low-pressure gaseous refrigerant flows through the gas-liquid separator 204 for gas-liquid separation, and then is compressed by the compressor 201 to become a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant then flows through the refrigerant flow channel of the water-cooled heat exchanger 101 to release heat, and transfers the heat to the coolant in the power unit coolant circulation branch 100 through the heat exchange tube wall of the water-cooled heat exchanger, so that the coolant is heated. The coolant that then flows through the water-cooled heat exchanger 101 to absorb heat and heat up flows through the coolant flow channel of the first outdoor heat exchanger 102, releases heat and cools down at the first outdoor heat exchanger 102, and dissipates the heat into the air.

[0067] By using the thermal management system provided by the embodiment of the present disclosure, by using the water-cooled heat exchanger 101 to couple the power unit coolant circulation branch 100 and the refrigerant circuit 200 for heat exchange, it is possible to use the first outdoor heat exchanger 102 to dissipate the heat enriched in the refrigerant circuit 200 into the air, without the need to set up an external air heat exchanger for heat dissipation of the refrigerant circuit 200. Since the specific heat capacity of the coolant is greater than the specific heat capacity of the air, and the heat conduction efficiency of the coolant is greater than the heat conduction efficiency of the air, the water-cooled heat exchanger 101 can be set to a smaller size and still meet the heat dissipation efficiency requirements of the battery cooling mode. Since there is no need to set up an external air heat exchanger for heat dissipation of the refrigerant circuit 200, only a smaller water-cooled heat exchanger 101 is required. The solution provided by the embodiment of the present disclosure can solve the problem of difficulty in reasonably arranging the external air heat exchanger in the power unit coolant circulation branch 100 and the external air heat exchanger in the heat exchange of the refrigerant circuit 200 when the vehicle's external space is limited.

[0068] Figure 2 Schematic diagram of the structure of the thermal management system provided by some other embodiments of the present disclosure. Figure 2 As shown, the thermal management system in the embodiment of the present disclosure includes a battery coolant circulation branch 300 in addition to the power device coolant circulation branch 100 and the refrigerant circuit 200 .

[0069] The battery coolant circulation branch 300 is a branch for thermal management of the battery pack. In the disclosed example, the battery coolant circulation branch 300 is also a coolant circulation flow branch. In the disclosed embodiment, the "battery coolant circulation branch 300" is described as a branch. In a specific implementation, the battery coolant circulation branch 300 can be a coolant circulation loop, or it can be a part of a cooling circulation loop (that is, as a part of a circulation loop), and the corresponding content is further explained in the working mode analysis later.

[0070] See also Figure 2 The battery coolant circulation branch 300 includes a battery cooler 301, a battery heat exchanger 302, and a second water pump 303. Driven by the second water pump 303, the coolant can circulate between the battery cooler 301 and the battery heat exchanger 302 to achieve heat exchange, that is, to achieve thermal management of the battery pack. Correspondingly, the refrigerant evaporator in the refrigerant circuit 200 is the battery cooler 301.

[0071] Combining the function of the battery cooler 301 and its position in the thermal management system, it can be seen that the battery cooler 301 is a refrigerant evaporator (equivalent to Figure 1203 in the battery coolant circulation branch 300). The coolant that flows through the evaporator (including) and absorbs heat and heats up releases heat when it flows through the battery cooler 301, and transfers the heat to the low-temperature and low-pressure liquid refrigerant through the heat exchange tube wall of the battery cooler 301, so that the low-temperature and low-pressure liquid refrigerant absorbs heat and evaporates to become a low-temperature and low-pressure gaseous refrigerant. Please note here that in order to achieve the evaporation and heat absorption of the refrigerant at the battery cooler 301, an expansion valve 304 for refrigerant throttling needs to be set on the inlet side of the refrigerant flow channel of the battery cooler 301.

[0072] By adopting the thermal management system provided in the embodiment of the present disclosure, the battery cooler 301 is used to perform heat exchange between the battery coolant circulation branch 300 and the refrigerant circuit 200, and the water-cooled heat exchanger 101 is used to perform heat exchange between the power unit coolant circulation branch 100 and the refrigerant circuit 200, so that the heat generated by the battery operation can be dissipated into the air by using the first outdoor heat exchanger 102.

[0073] In the disclosed embodiment, the thermal management system uses water cooling heat exchange to perform thermal management on the battery, that is, the battery coolant circulation branch 300 is used to perform thermal management on the battery. In other embodiments, the thermal management system may also use a refrigerant directly through the battery cold plate to perform thermal management on the battery. The refrigerant directly through the battery cold plate is to directly pass the refrigerant used for thermal management into the refrigerant flow channel of the battery cold plate, and use the refrigerant to release heat or absorb heat to achieve thermal management of the battery. When the refrigerant is used to directly manage the heating of the battery, the high-temperature refrigerant flowing out of the compressor refrigerant outlet flows into the battery cold plate to release heat, thereby heating the battery. When the refrigerant is used to directly manage the cooling of the battery, the low-temperature and high-pressure liquid refrigerant after the heat dissipation treatment is throttled by the throttle valve to a low-temperature and low-pressure liquid refrigerant, and the low-temperature and low-pressure liquid refrigerant absorbs heat and evaporates in the refrigerant flow channel of the battery cold plate, thereby cooling the battery.

[0074] Figure 3 Schematic diagram of the structure of the thermal management system provided by some other embodiments of the present disclosure. Figure 3 As shown, the overall architecture of the thermal management system of the embodiment of the present disclosure is the same as the overall architecture of the thermal management system of the previous embodiment. Figure 2 What is different from the thermal management system shown is that the refrigerant circuit 200 in the embodiment of the present disclosure further includes a second outdoor heat exchanger 205 , and the refrigerant flow channel in the second outdoor heat exchanger 205 is connected in series with the refrigerant flow channel in the water-cooled heat exchanger 101 .

[0075] The second outdoor heat exchanger 205 is a heat exchanger used to realize direct heat exchange between the refrigerant in the refrigerant circuit 200 and the air. Combined with its function, it can be seen that by adding the second outdoor heat exchanger 205 on the basis of setting the water-cooled heat exchanger 101 in the refrigerant circuit 200, the heat exchange efficiency and / or heat exchange power between the refrigerant circuit 200 and the outside air can be further improved in certain working modes. In specific implementation, at least the heat exchange power between the refrigerant and the outside air in the battery cooling mode can be improved, which will be analyzed later.

[0076] like Figure 3 As shown, in the embodiment of the present disclosure, the second outdoor heat exchanger 205 can be arranged downstream of the water-cooled heat exchanger 101, that is, the refrigerant flow channel inlet of the second outdoor heat exchanger 205 is connected to the refrigerant flow channel outlet of the water-cooled heat exchanger 101. In actual applications, the temperature of the high-temperature and high-pressure gaseous refrigerant obtained by compressing the gaseous refrigerant by the compressor 201 is much higher than the air temperature, but is not much different from the temperature of the coolant in the power device coolant circulation branch 100.

[0077] By setting the second outdoor heat exchanger 205 downstream of the water-cooled heat exchanger 101, in certain operating modes (for example, in battery cooling mode), the temperature difference between the coolant and the high-temperature and high-pressure gaseous refrigerant in the water-cooled heat exchanger 101 can be utilized to transfer as much heat as possible to the coolant in the power unit coolant circulation branch 100, so as to achieve sufficient heat dissipation using the second outdoor heat exchanger 205.

[0078] Of course, in some other embodiments, the second outdoor heat exchanger 205 may not be arranged downstream of the water-cooled heat exchanger 101, but may be arranged upstream of the water-cooled heat exchanger 101, that is, the refrigerant flow channel outlet of the second outdoor heat exchanger 205 is connected to the refrigerant flow channel outlet of the water-cooled heat exchanger 101.

[0079] Continue to see Figure 3 In the disclosed embodiment, the refrigerant circuit 200 may further include a first expansion valve 206. The first expansion valve 206 is disposed between the refrigerant flow channel inlet of the second outdoor heat exchanger 205 and the refrigerant flow channel outlet of the water-cooled heat exchanger 101, and is used to control the flow state of the refrigerant between the water-cooled heat exchanger 101 and the second outdoor heat exchanger 205. According to the flow limiting function of the expansion valve, by disposing the first expansion valve 206 between the water-cooled heat exchanger 101 and the second outdoor heat exchanger 205, the refrigerant flow to the second outdoor heat exchanger 205 can be controlled according to the temperature of the second outdoor heat exchanger 205, thereby achieving reasonable heat exchange at the second outdoor heat exchanger 205.

[0080] Please continue to see Figure 3In some embodiments of the present disclosure, the refrigerant circuit 200 may further include a bypass valve, which is connected in parallel with the second outdoor heat exchanger 205 and is used to bypass the second outdoor heat exchanger 205 in some working modes. The aforementioned working mode may be a working mode in which the outside temperature is too low to absorb heat and heat through an external air heat exchanger, including a first ultra-low temperature heating mode and a second ultra-low temperature heating mode. How the thermal management system works in the first ultra-low temperature heating mode and the second ultra-low temperature heating mode will be analyzed later.

[0081] The bypass valve used in the embodiment of the present disclosure is the second expansion valve 207. The branch where the second expansion valve 207 is located is connected in parallel with the branch formed by the first expansion valve 206 and the second outdoor heat exchanger 205 to achieve bypassing of the second outdoor heat exchanger 205 in a specific working mode. In other embodiments, the bypass valve may also be other types of valves, such as a three-way valve. In this case, the inlet end of the bypass valve should be connected to the outlet end of the first expansion valve 206, so that the first expansion valve 206 is used to control the refrigerant flow through the bypass valve when the second outdoor heat exchanger 205 is bypassed.

[0082] When the second expansion valve 207 is provided and the second outdoor heat exchanger 205 is bypassed through the second expansion valve 207, the refrigerant flowing through the second expansion valve 207 may flow back into the second outdoor heat exchanger 205 from the refrigerant flow channel outlet of the second outdoor heat exchanger 205. In the first ultra-low temperature heating mode and the second ultra-low temperature heating mode, if the refrigerant flows back into the second outdoor heat exchanger 205, the second external air heater heat exchanger will become a heat radiator, causing heat loss in the thermal management system and storage of refrigerant.

[0083] In order to avoid the problem mentioned in the previous paragraph, in some embodiments of the present disclosure, a first one-way valve 208 may also be provided at the refrigerant flow channel outlet of the second outdoor heat exchanger 205, and the first one-way valve 208 is used to prevent the refrigerant from flowing back from the refrigerant flow channel outlet of the second outdoor heat exchanger 205 into the second outdoor heat exchanger 205.

[0084] Please continue to see Figure 3 In some embodiments of the present disclosure, the refrigerant circuit 200 may further include a condenser 209. The refrigerant flow channel inlet of the condenser 209 is connected to the refrigerant flow channel outlet of the refrigerant compressor 201, and the refrigerant flow channel outlet of the condenser 209 is connected to the refrigerant flow channel inlet of the water-cooled heat exchanger 101. The condenser 209 is a heat exchanger that realizes heat dissipation of the high-temperature and high-pressure refrigerant compressed by the compressor 201, and is installed in the vehicle compartment to heat the compartment air.

[0085] In a specific implementation, a heating fan and a first air duct regulating damper are arranged in the vehicle compartment. When the condenser 209 is required to heat the vehicle compartment air, the heating fan and the first air duct regulating damper are opened, so that the air in the vehicle compartment flows through the condenser 209 to absorb heat.

[0086] Of course, in other embodiments of the present disclosure, the refrigerant circuit 200 may not be provided with the condenser 209. Accordingly, the thermal management system does not have the function of heating the vehicle compartment.

[0087] Please continue to see Figure 3 In some embodiments of the present disclosure, the refrigerant circuit 200 may further include an evaporator 210. The refrigerant flow channel of the evaporator 210 is connected in parallel with the refrigerant flow channel of the battery cooler 301. In order to throttle the medium-temperature and high-pressure liquid refrigerant to a low-temperature and low-pressure liquid refrigerant and then evaporate and absorb heat in the evaporator 210, a fourth throttle valve 212 is also provided at the inlet end of the refrigerant flow channel of the evaporator 210.

[0088] In a specific implementation, a heating fan and a second air duct regulating damper are arranged in the vehicle compartment. When the evaporator 210 is needed to cool the vehicle compartment air, the heating fan and the second air duct regulating damper are opened, so that the air in the vehicle compartment flows through the evaporator 210 to release heat.

[0089] As analyzed above, because the evaporator 210 is connected in parallel with the battery cooler 301, in some working modes, the refrigerant flowing through the battery cooler 301 may flow back from the refrigerant flow channel outlet of the evaporator 210 into the evaporator 210 to evaporate and dissipate heat, and the refrigerant may accumulate, thus affecting the normal operation of the system. Figure 3 As shown, in the embodiment of the present disclosure, a second one-way valve 211 is further provided at the outlet of the refrigerant flow channel of the evaporator 210 , and the second one-way valve 211 is used to prevent the refrigerant from flowing back into the evaporator 210 from the outlet of the refrigerant flow channel of the evaporator 210 .

[0090] In the above implementation, the evaporator 210 is provided in the refrigerant circuit 200. In other embodiments of the present disclosure, the refrigerant circuit 200 may not be provided with the evaporator 210. Accordingly, the thermal management system does not have the function of cooling the vehicle compartment.

[0091] Please continue to participate Figure 3 In some further embodiments of the present disclosure, the power plant coolant circulation branch 100 may further include a first three-way valve 106 and a four-way valve 107 .

[0092] The first port of the first three-way valve 106 is communicated with the outlet of the coolant flow channel of the first outdoor heat exchanger 102, the second port of the first three-way valve 106 is communicated with the outlet of the coolant flow channel of the water-cooled heat exchanger 101, and the outlet of the first three-way valve 106 is communicated with the first port of the four-way valve 107. The first three-way valve 106 is used to bypass the first outdoor heat exchanger 102 in the target working mode, and no longer use the first outdoor heat exchanger 102 to exchange heat with the air. In a specific implementation, the aforementioned target working mode includes a waste heat recovery mode and a second ultra-low temperature heating mode.

[0093] The first port of the four-way valve 107 is connected to the outlet of the first three-way valve 106, and the second port and the third port of the four-way valve 107 are connected to the battery management branch, which is used to connect the battery management branch and the power unit coolant circulation branch 100 in series into a coolant circulation loop under the target working mode.

[0094] That is to say, in the target working mode, the water-cooled heat exchanger 101, the second water pump 303, the battery cooler 301, the battery heat exchanger, the first water pump 103, and the power device heat exchanger (of course, including the aforementioned first three-way valve 106 and four-way valve 107) form a coolant circulation loop. By connecting the power device coolant circulation branch 100 and the battery coolant circulation branch 300 in series into a circulation loop in the target working mode, the refrigerant compression function in the refrigerant circuit 200 can be fully utilized, and the heat generated by the battery or the power device during operation can be fully recovered, which will be explained later when analyzing the specific working mode.

[0095] Please continue to see Figure 3 In some embodiments, the battery coolant circulation branch 300 may further include a second three-way valve 305, wherein the first port of the second three-way valve 305 is connected to the outlet of the refrigerant flow channel of the battery cooler 301, the second port of the second three-way valve 305 is connected to the outlet of the refrigerant flow channel of the battery heat exchanger 302, and the outlet of the second three-way valve 305 is connected to the first port of the four-way valve 107, for bypassing the battery heat exchanger 302 in at least one working mode. The aforementioned working mode is the first ultra-low temperature heating mode or the second ultra-low temperature heating mode. In the first ultra-low temperature heating mode and the second ultra-low temperature heating mode, due to the low ambient temperature, the heat generated during the battery discharge process can only meet the requirements of maintaining its own temperature within a reasonable working range. Therefore, at this time, the coolant is no longer allowed to flow through the battery pack radiator, but the battery pack radiator is directly bypassed.

[0096] It should be noted that when the second three-way valve 305 is used to bypass the battery heat exchanger 302 in the battery coolant circulation branch 300, the coolant in the battery coolant circulation branch 300 circulates but does not flow through the battery heat exchanger 302, that is, it is not for achieving thermal management of the battery, but for achieving other functions. For the corresponding content, please pay attention to the analysis of the working mode in the following text.

[0097] Please continue to see Figure 3 In some embodiments of the present disclosure, the battery coolant circulation branch 300 may further include an electric heater 306. The electric heater 306 is connected in series with the battery cooler 301, and is used to electrically heat the coolant flowing through the battery coolant circulation branch 300 in at least one operating mode. In certain operating modes, the heat generated during the battery operation process and / or the power unit operation process is not enough to meet the heat demand of the entire thermal management system. At this time, by using the electric heater 306 to heat the coolant, sufficient heat energy can be provided to the entire thermal management system to ensure that the thermal management system meets the heating needs of the vehicle.

[0098] As analyzed above, the thermal management system in the disclosed embodiment can work in various working modes, including battery cooling mode (specifically battery fast charging and cooling mode under battery fast charging), cabin cooling mode, combined cooling mode (that is, a mode that cools the cabin and battery at the same time), cabin heating mode, waste heat recovery mode, first ultra-low temperature heating mode, second ultra-low temperature heating mode, single steam dehumidification mode and double steam dehumidification mode. The following various working modes are analyzed to see how the thermal management system works. The following various working modes are Figure 3 Of course, some of these operating modes can also be Figure 2 or by Figure 3 The thermal management system is implemented in other thermal management systems that are composed of some components in the thermal management system.

[0099] 1. Battery cooling mode

[0100] Figure 4 The figure is a schematic diagram of the cycle operation of the thermal management system in the battery cooling mode in some embodiments. The battery cooling mode can be a cooling mode in the process of battery heat release when the vehicle is running, or a cooling mode in the process of battery charging when the vehicle is stopped. The core of the cooling mode is to cool the battery and control the battery to be within the set operating temperature range.

[0101] like Figure 4As shown, in the battery cooling mode: (1) the AB port and the CD port in the four-way valve 107 are connected, so that the battery coolant circulation branch 300 and the power unit coolant circulation branch 100 form two independent coolant circulation loops; (2) the inlet B (second port) of the second three-way valve 305 is connected to the outlet C; (3) the second expansion valve 207 is closed, and the refrigerant flows through the second outdoor heat exchanger 205; (4) the inlet A and the outlet C of the first three-way valve 106 are connected.

[0102] In the battery cooling mode, the coolant heat exchange process of the battery coolant circulation branch 300 is as follows: driven by the second water pump 303, the coolant in the battery coolant circulation branch 300 absorbs heat through the battery heat exchanger 302, and then flows into the battery cooler 301 after passing through the second three-way valve 305, the four-way valve 107, the second water pump 303, and the electric heater 306. In the battery cooler 301, the coolant exchanges heat with the refrigerant, and transfers heat to the low-temperature and low-pressure liquid refrigerant flowing through the battery cooler 301.

[0103] In the battery cooling mode, the heat exchange process of the refrigerant circuit 200 is as follows: after the gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 201, the high-temperature and high-pressure gaseous refrigerant flows through the condenser 209 and then passes through the water-cooled heat exchanger 101, where heat exchange is performed and part of the heat is transferred to the coolant in the power unit coolant circulation branch 100; then the high-temperature and high-pressure gaseous refrigerant passes through the first expansion valve 206 and enters the second outdoor heat exchanger 205, and in the second Heat is dissipated at the outdoor heat exchanger 205 to form a low-temperature, high-pressure liquid refrigerant; then the low-temperature, high-pressure liquid refrigerant flows through the third expansion valve 213, and is transformed into a low-temperature, low-pressure liquid refrigerant through the throttling effect of the third throttle valve and enters the battery cooler 301, where the low-temperature, low-pressure liquid refrigerant evaporates and absorbs heat in the battery cooler 301 to become a low-temperature, low-pressure gaseous refrigerant; then, the low-temperature, low-pressure gaseous refrigerant flowing out of the battery cooler 301 passes through the gas-liquid separator 204 and flows back to the compressor 201 for compression. In the refrigerant circuit 200, the water-cooled heat exchanger 101 and the second outdoor heat exchanger 205 are used as condensers to achieve the condensation of the high-temperature, high-pressure gaseous refrigerant, and transfer the heat to the power unit coolant circulation branch 100 and the outdoor air respectively.

[0104] In the battery cooling mode, the heat exchange process of the power unit coolant circulation branch 100 is as follows: driven by the first water pump 103, the coolant in the power unit coolant circulation branch 100 flows through the first sub-heat exchanger 104 (motor controller heat exchanger) and the second sub-heat exchanger 105 (drive motor heat exchanger), and then flows through the water-cooled heat exchanger 101 to absorb the heat of the high-temperature and high-pressure refrigerant to become high-temperature coolant. The high-temperature coolant flows through the first outdoor heat exchanger 102 to dissipate heat. The coolant after heat dissipation flows back to the first sub-heat exchanger 104 via the first three-way valve 106, the four-way valve 107, and the first water pump 103.

[0105] It should be noted that the battery cooling mode can be a cooling mode during the battery heat release process when the vehicle is running, or it can be a cooling mode during the battery charging process when the vehicle is stopped, and the embodiments of the present disclosure do not limit this. In a specific implementation, if the vehicle is in a driving state and the power unit is in a high temperature state in the battery cooling mode, the power unit coolant circulation branch 100 can simultaneously achieve heat dissipation of the power unit. If the vehicle is in a charging state and the ambient temperature is low, the power unit in the power unit coolant circulation branch 100 can also serve as a heat source to dissipate heat to the outside world.

[0106] The cooling mode of the thermal management system provided by the embodiment of the present disclosure is adopted, and part of the heat in the refrigerant circuit 200 is introduced into the power unit coolant circulation branch 100 by using the water-cooled heat exchanger 101, and the heat is dissipated into the air by using the first outdoor heat exchanger 102 of the power unit coolant circulation branch 100, so as to solve the problem of insufficient heat dissipation of the second external air radiator due to size limitations, thereby increasing the heat dissipation efficiency of the entire thermal management system for the battery. Especially when the battery is in fast charging mode, the thermal management system can ensure that the battery temperature is within a reasonable temperature range, and then ensure that the fast charging current can continue to maintain a large current, thereby increasing the fast charging power.

[0107] 2. Cabin cooling mode

[0108] Figure 5 The following is a schematic diagram of the cycle operation of the thermal management system in the cabin cooling mode in some embodiments. The cabin cooling mode can be executed when the vehicle is driving or when the vehicle is parked. The core of the mode is to cool the cabin air through the refrigerant so that the cabin temperature is within the set temperature range.

[0109] like Figure 5As shown, in the cabin cooling mode: (1) the CD port in the four-way valve 107 is connected, so that the battery coolant circulation branch 300 and the power unit coolant circulation branch 100 form two independent coolant circulation loops; however, at this time, the second water pump 303 in the battery coolant circulation branch 300 does not work, and the coolant therein does not circulate; (2) the second expansion valve 207 is closed, and the refrigerant flows through the second outdoor heat exchanger 205; (3) the inlet A and outlet C of the first three-way valve 106 are connected.

[0110] In the cabin cooling mode, the heat exchange process of the refrigerant circuit 200 is as follows: after the gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 201, the high-temperature and high-pressure gaseous refrigerant flows through the condenser 209 and the water-cooled heat exchanger 101 (in some cases, especially when the cabin is at a high temperature, the heat in the high-temperature and high-pressure gaseous refrigerant may also be transferred to the coolant in the power unit coolant circulation branch 100 through the water-cooled heat exchanger 101), and then enters the second outdoor heat exchanger 205 through the first expansion valve 206, and dissipates heat at the second outdoor heat exchanger 205 to form a medium-temperature and high-pressure liquid refrigerant. Subsequently, the medium-temperature and high-pressure refrigerant flows through the fourth throttle valve 212, and under the throttling effect of the fourth expansion valve, it becomes a low-temperature and low-pressure other refrigerant and enters the evaporator 210 to evaporate and absorb heat; then, the low-temperature and low-pressure gaseous refrigerant flowing out of the evaporator 210 passes through the gas-liquid separator 204 and flows back to the compressor 201 for compression. In the refrigerant circuit 200, the second outdoor heat exchanger 205 is used as a radiator (in some cases, the water-cooled heat exchanger 101 is also used as a radiator), thereby achieving cooling of the high-temperature and high-pressure gaseous refrigerant.

[0111] In the cabin cooling mode, the heat exchange process of the power unit coolant circulation branch 100 is as follows: driven by the first water pump 103, the coolant in the power unit coolant circulation branch 100 flows through the first sub-heat exchanger 104 (motor controller heat exchanger) and the second sub-heat exchanger 105 (drive motor heat exchanger), and then flows through the water-cooled heat exchanger 101 (when the temperature of the refrigerant flowing through the water-cooled heat exchanger 101 is very high, the coolant will absorb the heat of the refrigerant and heat up), and then the coolant flows through the first outdoor heat exchanger 102 to dissipate heat, and the coolant after heat dissipation flows back to the first sub-heat exchanger 104 via the first three-way valve 106, the four-way valve 107, and the first water pump 103. In a specific implementation, if the vehicle is in a driving state and the power unit is in a high temperature state in the cabin cooling mode, the power unit coolant circulation branch 100 can simultaneously achieve heat dissipation of the power unit.

[0112] 3. Combined cooling mode

[0113] As analyzed above, the combined cooling mode is a mode that cools the vehicle compartment and the battery at the same time. Figure 6Schematic diagram of the cycle operation of the thermal management system in the combined cooling mode in some embodiments. The combined cooling mode can be executed when the vehicle is driving or when the vehicle is parked. The core of the combined cooling mode is to cool the battery cooler 301 and the cabin air at the same time through the refrigerant, so that the battery temperature and the cabin temperature are in the corresponding set temperature range at the same time.

[0114] like Figure 6 As shown, compared with the aforementioned battery cooling mode, the combined cooling mode is only to make the medium-temperature high-pressure liquid refrigerant pass through the fourth expansion valve to be throttled to low-temperature low-pressure liquid refrigerant in the battery cooling mode and then be discharged to the evaporator 210. For convenience, the combined cooling mode will not be analyzed here, and the relevant content can be referred to the aforementioned battery cooling mode and cabin cooling mode.

[0115] 4. Carriage heating mode

[0116] The cabin heating mode is a mode in which the refrigerant circuit 200 absorbs heat and heats the cabin air when the ambient temperature is not too low. The cabin heating mode can be executed when the vehicle is driving or when the vehicle is parked, and can also be executed when the battery is charging under certain special environmental conditions (for example, when the ambient temperature is low and the battery is slowly charged).

[0117] Figure 7 FIG. 1 is a schematic diagram of the cycle operation of the thermal management system in the cabin heating mode in some embodiments. Figure 7 As shown, in some embodiments, in the cabin heating mode, the second water pump 303 in the battery coolant circulation branch 300 and the first water pump 103 in the power unit coolant circulation branch 100 do not work, and accordingly the coolant therein does not circulate.

[0118] In the cabin heating mode, the heat exchange process of the refrigerant circuit 200 is as follows: After the gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 201, the high-temperature and high-pressure gaseous refrigerant heats the air flowing through the condenser 209 when flowing through the condenser 209, thereby heating the air in the cabin and turning into a medium-temperature and high-pressure liquid refrigerant. Then the medium-temperature and high-pressure refrigerant passes through the water-cooled heat exchanger 101. At this time, the water-cooled heat exchanger 101 only serves as a refrigerant flow channel and does not participate in heat exchange. After passing through the water-cooled heat exchanger 101, the high-pressure and medium-temperature refrigerant is transformed into a low-temperature and low-pressure liquid refrigerant under the throttling effect of the first expansion valve 206 and passes through the second outdoor heat exchanger 205. The low-temperature and low-pressure liquid refrigerant evaporates and absorbs heat in the second outdoor heat exchanger 205 to become a low-temperature and low-pressure gaseous refrigerant. Then the low-temperature and low-pressure gaseous refrigerant passes through the third expansion valve 213 and the battery cooler 301. At this time, the battery cooler 301 only serves as a flow channel and does not transfer heat. Finally, the low-temperature and low-pressure gaseous refrigerant flowing out of the battery cooler 301 flows through the gas-liquid separator 204 and then returns to the compressor 201 .

[0119] 5. Waste heat recovery mode

[0120] The waste heat recovery mode is a mode that recovers the heat generated by the battery and power unit and uses the recovered heat to heat the cabin air. The waste heat recovery mode is mostly used during vehicle driving.

[0121] Figure 8 FIG. 1 is a schematic diagram of the cycle operation of the thermal management system in the waste heat recovery mode in some embodiments. Figure 8 As shown, in the waste heat recovery mode: (1) the AD port and the BC port in the four-way valve 107 are connected, and the battery coolant circulation branch 300 and the power unit coolant circulation branch 100 are connected in series to form a large coolant circulation loop; (2) the BC port of the second three-way valve 305 is connected; (3) the BC port of the first three-way valve 106 is connected; (4) the second expansion valve 207 is closed; (5) the fourth expansion valve 212 is closed.

[0122] In the waste heat recovery mode, the coolant heat exchange process of the coolant circulation loop is as follows: driven by the first water pump 103 and / or the second water pump 303, the coolant flows through the second water pump 303 and the electric heater 306. At this time, the heating function of the electric heater 306 is turned off, and the electric heater 306 is only a coolant flow channel. The coolant flowing through the electric heater 306 enters the battery cooler 301 and releases heat, transferring the heat to the refrigerant; the coolant flowing out of the battery cooler 301 then enters the battery heat exchanger 302, where it absorbs heat and heats up. After the coolant flowing out of the battery heat exchanger 302 passes through the BC port of the second three-way valve 305, the AD port of the four-way valve 107 and the first water pump 103, it continues to absorb heat and heat up when it flows through the first sub-heat exchanger 104 (motor controller heat exchanger) and the second sub-heat exchanger 105 (drive motor heat exchanger). The coolant then flows through the water-cooled heat exchanger 101 to continue absorbing heat and increasing in temperature, and then flows through the BC port of the first three-way valve 106 and the CB port of the four-way valve 107 and flows back to the second water pump 303 to complete the circulation in the coolant circulation loop.

[0123] In the waste heat recovery mode, the heat exchange process of the refrigerant circuit 200 is as follows: After the gaseous refrigerant is compressed into a high-temperature and high-pressure refrigerant by the compressor 201, the high-temperature and high-pressure gaseous refrigerant heats the air flowing through the condenser 209 when flowing through the condenser 209, thereby heating the air in the car and turning into a medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant further dissipates heat through the water-cooled heat exchanger 101, increases the degree of supercooling, and turns into a low-pressure and low-temperature liquid refrigerant under the throttling effect of the first expansion valve 206. The low-temperature and low-pressure liquid refrigerant absorbs heat from the air when passing through the second outdoor heat exchanger 205. At this time, the third expansion valve 213 is fully opened, and the low-temperature and low-pressure liquid refrigerant or mixed refrigerant enters the battery cooler 301 to absorb heat and turn into a low-temperature and low-pressure gaseous refrigerant. After passing through the gas-liquid separator 204, the low-temperature and low-pressure gaseous refrigerant returns to the electric compressor 201 to complete the cycle.

[0124] 6. The first ultra-low temperature heating mode

[0125] The first ultra-low temperature heating mode is a working mode in which the vehicle compartment is heated by absorbing the heat generated by the electric heater 306 when the ambient temperature is too low (e.g., below -10°C) and the first outdoor heat exchanger 102 and / or the second outdoor heat exchanger 205 cannot be used to absorb air heat to heat the vehicle compartment. The first ultra-low temperature heating mode can be a heating mode used when the vehicle is in a parking state.

[0126] Fig. 9 FIG. 1 is a schematic diagram of the cycle operation of the thermal management system in the first ultra-low temperature heating mode in some embodiments. Fig. 9 As shown, in the first ultra-low temperature heating mode: (1) the first water pump 103 in the coolant in the power unit coolant circulation branch 100 does not work, and the coolant in the corresponding power unit coolant circulation branch 100 does not circulate; (2) the AB port in the four-way valve 107 is connected; (3) the AC of the second three-way valve 305 is connected to bypass the battery heat exchanger 302; (4) the second expansion valve 207 is opened, the first expansion valve 206 is closed, and the second outdoor heat exchanger 205 in the refrigerant circuit 200 is bypassed.

[0127] In the first ultra-low temperature heating mode, the coolant heat exchange process of the battery coolant circulation branch 300 is as follows: driven by the second water pump 303, when the coolant flows through the electric heater 306, it absorbs the heat generated by the electric heater 306 and heats up; then, the cooling heat flows through the battery cooler 301, and releases heat in the battery cooler 301, and releases the heat to the refrigerant in the refrigerant circuit 200 via the battery cooler 301; then, the coolant flows back to the second water pump 303 through the AC port of the second three-way valve 305 and the AB port of the four-way valve 107, completing a cycle.

[0128] In the first ultra-low temperature heating mode, the refrigerant heat exchange process of the refrigerant circuit 200 is as follows: after the gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 201, the high-temperature and high-pressure gaseous refrigerant heats the air flowing through the condenser 209 when flowing through the condenser 209, thereby heating the air in the vehicle compartment and becoming a medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant flows through the water-cooled heat exchanger 101 and the second expansion valve 207, and is transformed into a low-temperature and low-pressure liquid refrigerant under the throttling effect of the third expansion valve 213 and enters the battery cooler 301. The low-temperature and low-pressure liquid refrigerant absorbs heat at the battery cooler 301 and becomes a low-temperature and low-pressure gaseous refrigerant; then the low-temperature and low-pressure gaseous refrigerant passes through the gas-liquid separator 204 and returns to the compressor 201 to complete the cycle.

[0129] 7. Second ultra-low temperature heating mode

[0130] The second ultra-low temperature heating mode is a working mode in which the vehicle compartment is heated by absorbing the heat generated by the electric heater 306 and / or the power device when the ambient temperature is too low (e.g., below -10°C) and the first outdoor heat exchanger 102 and / or the second outdoor heat exchanger 205 cannot be used to absorb the heat of the air. The second ultra-low temperature heating mode can be a heating mode used when the vehicle is in a driving state (especially in a high-speed driving state).

[0131] Fig.10 FIG. 1 is a schematic diagram of the cycle operation of the thermal management system in the second ultra-low temperature heating mode in some embodiments. Fig.10 As shown, in the second ultra-low temperature heating mode; (1) the BC port and the AD port in the four-way valve 107 are connected, so that the battery coolant circulation branch 300 and the power unit coolant circulation branch 100 are connected in series to form a coolant circulation loop; (2) the AC of the second three-way valve 305 is connected to achieve bypass of the battery heat exchanger 302; (3) the second expansion valve 207 is opened, the first expansion valve 206 is closed, and the second outdoor heat exchanger 205 in the refrigerant circuit 200 is bypassed; (4) the BC port of the first three-way valve 106 is connected to achieve bypass of the first external air radiator.

[0132] In the second ultra-low temperature heating mode, the coolant heat exchange process in the coolant circulation loop is as follows: driven by the first water pump 103 and / or the second water pump 303, the coolant flows through the second water pump 303 and the electric heater 306; according to the working heat release state of the power state, the electric heater 306 may not be in a working state, may be in a low-power heat release state, or may be in a high-power heat release state. Correspondingly, the coolant may absorb heat and heat up when passing through the electric heater 306, or it may not absorb heat and heat up. Subsequently, the coolant flows through the AC port of the second three-way valve 305 and the AD port of the four-way valve 107 and flows through the first sub-heat exchanger 104 (motor controller heat exchanger) and the second sub-heat exchanger 105 (drive motor heat exchanger) in turn to absorb heat and heat up. Subsequently, the coolant flows through the water-cooled heat exchanger 101 to continue absorbing heat and heating up; then, the cooling heat flows through the BC port of the first three-way valve 106 and the CB port of the four-way valve 107 and then flows back to the second water pump 303, completing the cycle in the coolant circulation loop.

[0133] In the second ultra-low temperature heating mode, the refrigerant heat exchange process of the refrigerant circuit 200 is as follows: after the gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 201, the high-temperature and high-pressure gaseous refrigerant heats the air flowing through the condenser 209 when flowing through the condenser 209, thereby heating the air in the vehicle compartment and becoming a medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant flows through the water-cooled heat exchanger 101 and the second expansion valve 207, and becomes a low-temperature and low-pressure liquid refrigerant under the throttling effect of the third expansion valve 213, and then enters the battery cooler 301, and absorbs heat at the battery cooler 301 to become a low-temperature and low-pressure gaseous refrigerant; then the low-temperature and low-pressure gaseous refrigerant passes through the gas-liquid separator 204 and returns to the electric compressor 201 to complete the cycle.

[0134] Since the vehicle compartment can be heated by absorbing the heat generated by the operation of the power device in the second ultra-low temperature heating mode, the heating power of the electric heater 306 can be reduced, thereby improving the utilization efficiency of the battery power.

[0135] 8. Single steam dehumidification mode

[0136] The single steam dehumidification mode is used to dehumidify and heat the air in the vehicle compartment when the ambient temperature is not particularly low and the air humidity is high. The single steam dehumidification mode can be used when the electric vehicle is driving (mostly at a low speed), or when the electric vehicle is parked or even charging (it should be noted that the single steam dehumidification mode will not be executed in most fast charging modes).

[0137] Fig.11 FIG. 1 is a schematic diagram of the cycle operation of the thermal management system in the single steam dehumidification mode in some embodiments. Fig.11As shown, under the single steam dehumidification model: (1) the first water pump 103 does not work, and the coolant in the corresponding power unit coolant circulation branch 100 does not circulate; (2) the second water pump 303 does not work, and the coolant in the corresponding battery coolant circulation branch 300 does not circulate. (3) the second expansion valve 207 is closed, and the second outdoor heat exchanger 205 is not bypassed.

[0138] In the single evaporation dehumidification mode, the refrigerant heat exchange process of the refrigerant circuit 200 is as follows: after the gaseous refrigerant is compressed into a high-temperature and high-pressure refrigerant by the compressor 201, the high-temperature and high-pressure gaseous refrigerant heats the air flowing through the condenser 209 when flowing through the condenser 209, thereby heating the air in the vehicle compartment; then the high-temperature and high-pressure gaseous refrigerant flows through the water-cooled heat exchanger 101, and at this time the water-cooled heat exchanger 101 is only used as a flow channel. Then the high-temperature and high-pressure refrigerant passes through the first expansion valve 206 and the second outdoor heat exchanger 205, and continues to release heat at the second outdoor heat exchanger 205, becoming a medium-temperature and high-pressure liquid refrigerant. Then, the medium-temperature and high-pressure liquid refrigerant is transformed into a low-temperature and low-pressure liquid refrigerant by the throttling action of the fourth expansion valve and passes through the evaporator 210. The low-temperature and low-pressure liquid refrigerant evaporates and absorbs heat in the evaporator 210 to become a low-temperature and low-pressure gaseous refrigerant, thereby cooling and dehumidifying the air passing through the evaporator 210. After passing through the gas-liquid separator 204, the low-temperature and low-pressure gaseous refrigerant returns to the electric compressor 201 to complete the cycle.

[0139] It should be noted that in the single evaporation dehumidification mode, the air in the vehicle cabin first flows through the evaporator 210 to be cooled and dehumidified, and then passes through the condenser 209 to absorb heat and heat up.

[0140] 9. Double steam dehumidification mode

[0141] The double steam dehumidification mode is used to dehumidify and heat the air in the vehicle cabin and cool down the battery when the ambient temperature is not particularly low and the air humidity is high. The double steam dehumidification mode is mostly used when the vehicle is in motion and the battery is discharging at high power and generating too much heat.

[0142] Fig.12 Schematic diagram of the cycle operation of the thermal management system in the double evaporation mode in some embodiments. Fig.12 As shown, (2) the AB port of the four-way valve 107 is connected; (3) the BC port of the second three-way valve 305 is connected, and the battery heat exchanger 302 is not bypassed; (4) the second expansion valve 207 is closed, and the second outdoor heat exchanger 205 is not bypassed.

[0143] In the double-evaporation dehumidification mode, the refrigerant heat exchange process of the refrigerant circuit 200 is as follows: After the gaseous refrigerant is compressed into a high-temperature and high-pressure refrigerant by the compressor 201, the high-temperature and high-pressure gaseous refrigerant heats the air flowing through the condenser 209 when flowing through the condenser 209, thereby heating the air in the vehicle compartment. Subsequently, the high-temperature and high-pressure refrigerant flows through the water-cooled heat exchanger 101, and at this time the water-cooled heat exchanger 101 is only used as a flow channel. After that, the high-temperature and high-pressure gaseous refrigerant passes through the first expansion valve 206 and then passes through the second outdoor heat exchanger 205, and continues to release heat at the second outdoor heat exchanger 205, becoming a medium-temperature and high-pressure liquid refrigerant. Afterwards, part of the medium-temperature and high-pressure liquid refrigerant is transformed into low-temperature and low-pressure liquid refrigerant under the throttling effect of the fourth expansion valve, passes through the evaporator 210, evaporates and absorbs heat in the evaporator 210 to become low-temperature and low-pressure gaseous refrigerant, and realizes the cooling and dehumidification of the air flowing through the evaporator 210; part of the low-temperature and high-pressure liquid refrigerant passes through the battery cooler 301 under the throttling effect of the third expansion valve 213, and evaporates and absorbs the heat of the coolant in the battery coolant circulation branch 300 to become low-temperature and low-pressure gaseous refrigerant in the battery cooler 301. Finally, the low-temperature and low-pressure gaseous refrigerant passes through the gas-liquid separator 204 and returns to the electric compressor 201 to complete the cycle.

[0144] In the double-evaporation dehumidification mode, the coolant heat exchange process of the battery coolant circulation branch 300 is as follows: driven by the second water pump 303, the coolant flows through the electric heater 306. At this time, the electric heater 306 does not work, and the electric heater 306 only serves as a flow channel. Subsequently, the coolant flows through the battery cooler 301 to release heat and cool down. After that, the cooled coolant flows through the battery heat exchanger 302 to absorb heat and heat up. Finally, the heat-absorbing and heated coolant flows through the BC port of the second expansion valve 207 and the AB port of the four-way valve 107 and flows back to the second water pump 303, completing a heat exchange cycle.

[0145] In addition to providing the aforementioned control method for a thermal management system, the present disclosure also provides a control method for a thermal management system. The control method for a thermal management system can be applied to control at least one thermal management system in the aforementioned embodiments.

[0146] In some embodiments, the thermal management control method includes controlling the refrigerant in the refrigerant loop 200 to evaporate and dissipate heat at the water-cooled heat exchanger 101. By controlling the refrigerant to release heat at the water-cooled heat exchanger 101, at least part of the heat carried by the high-temperature and high-pressure refrigerant compressed by the refrigerant loop 200 can be dissipated into the air through the first outdoor heat exchanger 102.

[0147] In some embodiments, the thermal management system further includes a battery coolant circulation branch 300, and the battery coolant circulation branch 300 includes a battery cooler 301; the coolant circulation branch and the refrigerant circuit 200 achieve heat exchange through the battery cooler 301. The corresponding control method also includes controlling the refrigerant in the refrigerant circuit 200 to evaporate and absorb heat at the battery cooler 301 in the target working mode, and the target working mode includes a combined cooling mode or a battery cooling mode. The specific heat dissipation methods in the combined cooling mode and the battery cooling mode can refer to the analysis of the combined cooling mode and the battery cooling mode in the previous text.

[0148] In some embodiments, when the thermal management system includes a second outdoor heat exchanger 205, the thermal management control method also controls the refrigerant in the refrigerant circuit 200 to dissipate heat at the second external heat exchanger in the target operating mode, so that at least part of the heat carried by the refrigerant in the refrigerant circuit 200 is dissipated into the air through the second outdoor heat exchanger 205.

[0149] In some embodiments, the thermal management system further includes an evaporator 210. The thermal management control method controls the refrigerant to release heat at the water-cooled heat exchanger 101 and the second external control heat exchanger, and controls the refrigerant to absorb heat at the evaporator 210, thereby realizing the cabin cooling mode.

[0150] In some embodiments, the thermal management system further includes a condenser 209. The thermal management control method controls the high temperature and high pressure refrigerant to dissipate heat at the condenser 209 and controls the low temperature and low pressure refrigerant to evaporate and absorb heat at the second outdoor heat exchanger 205 to achieve the cabin heating mode.

[0151] In some embodiments, the thermal management control method realizes the waste heat recovery mode by performing the following operations: (1) controlling the BC port and the AD port in the four-way valve 107 to be connected, so that the battery coolant circulation branch 300 and the power unit coolant circulation branch 100 are connected in series to form a coolant circulation loop; (2) controlling the inlet B (second port) of the second three-way valve 305 to be connected to the outlet C; (3) controlling the second expansion valve 207 to be closed, (4) controlling the inlet B and the outlet C of the first three-way valve 106 to be connected; (5) controlling the coolant to absorb heat at the battery heat exchanger 302, the first sub-heat exchanger 104, the second sub-heat exchanger 105 and the water-cooled heat exchanger 101, and release heat at the battery cooler 301; (6) controlling the refrigerant to release heat at the condenser 209, and controlling the refrigerant to release heat at the water-cooled heat exchanger 101, and absorb heat at the second outdoor heat exchanger 205 and in the battery cooler 301.

[0152] In some embodiments, the thermal management control method realizes the first ultra-low temperature heating mode by performing the following operations: (1) controlling the AB port in the four-way valve 107 to be connected, and the AC connection of the second three-way valve 305 to realize bypassing the battery heat exchanger 302; (2) controlling the second expansion valve 207 to open and the first expansion valve 206 to close; (3) controlling the electric heater 306 to work, and controlling the refrigerant in the battery coolant circulation branch 300 to absorb heat at the electric heater and release heat at the battery cooler 301; (4) controlling the refrigerant to release heat at the condenser 209, and controlling the refrigerant to absorb heat at the battery cooler 301.

[0153] In some embodiments, the thermal management control method realizes the second ultra-low temperature heating mode by performing the following operations: (1) controlling the BC port and the AD port in the four-way valve 107 to be connected, so that the battery coolant circulation branch 300 and the power unit coolant circulation branch 100 are connected in series to form a coolant circulation loop; (2) controlling the AC connection of the second three-way valve 305 to realize bypassing the battery heat exchanger 302; (3) controlling the second expansion valve 207 to open and the first expansion valve 206 to close; (4) controlling the BC port of the first three-way valve 106 to be connected to realize bypassing the first external air radiator; (5) controlling the coolant battery heater to work, controlling the coolant to absorb heat at the first sub-heat exchanger 104, the second sub-heat exchanger 105 and the water-cooled heat exchanger 101, and releasing heat at the battery cooler 301; (6) controlling the refrigerant to release heat at the condenser 209, and controlling the refrigerant to absorb heat at the battery cooler 301.

[0154] An embodiment of the present disclosure further provides a control device, which includes a processor and a memory, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the control method of the thermal management system of any of the above embodiments can be implemented.

[0155] Fig.13 Schematic diagram of the structure of the control device provided by the embodiment of the present disclosure. Fig.13 , which shows a schematic diagram of the structure of a control device suitable for implementing the embodiments of the present disclosure. Fig.13 The control device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0156] like Fig.13As shown, the control device 1300 may include a processing device 1301 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory ROM 1302 or a program loaded from a storage device 1308 to a random access memory RAM 1303. In the RAM 1303, various programs and data required for the operation of the control device 1300 are also stored. The processing device 1301, the ROM 1302, and the RAM 1303 are connected to each other via a bus 1304. An input / output I / O interface 1305 is also connected to the bus 1304.

[0157] Typically, the following devices may be connected to the I / O interface 1305: input devices 1306 including, for example, a touch screen, a touch pad, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices 1307 including, for example, a liquid crystal display, a speaker, a vibrator, etc.; storage devices 1308 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 1309. The communication devices 1309 may allow the control device 1300 to communicate with other devices wirelessly or by wire to exchange data. Although Fig.13 The control device 1300 is shown with various devices, but it should be understood that it is not required to implement or have all the devices shown. More or fewer devices may be implemented or have instead.

[0158] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a non-transitory computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication device 1309, or installed from the storage device 1308, or installed from the ROM 1302. When the computer program is executed by the processing device 1301, the above-mentioned functions defined in the method of the embodiment of the present disclosure are executed.

[0159] It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0160] In some embodiments, the client and the server may communicate using any currently known or future developed network protocol such as HTTP (Hypertext Transfer Protocol), and may be interconnected with any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network ("LAN"), a wide area network ("WAN"), an internet (e.g., the Internet), and a peer-to-peer network (e.g., an ad hoc peer-to-peer network), as well as any currently known or future developed network.

[0161] The computer-readable medium may be included in the control device, or may exist independently without being assembled into the control device.

[0162] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated system based on hardware that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0163] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0164] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection according to one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0165] The embodiments of the present disclosure also provide a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the method of any of the above method embodiments can be implemented. The execution method and beneficial effects are similar and will not be repeated here.

[0166] The disclosed embodiments also provide a vehicle, the vehicle including the aforementioned thermal management system, and the corresponding thermal management working modes can be realized by controlling the thermal management system according to the aforementioned control methods under various working modes.

[0167] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0168] The above are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermal management system, characterized in that: It includes a power unit coolant circulation branch and a refrigerant circuit; The power unit coolant circulation branch includes a first outdoor heat exchanger; The coolant circulation branch of the power unit is coupled to the refrigerant circuit via a water-cooled heat exchanger, and the outlet of the coolant flow channel of the water-cooled heat exchanger is connected to the inlet of the coolant flow channel of the first outdoor heat exchanger.

2. The system according to claim 1, characterized in that Also included is a battery coolant circulation branch, the battery coolant circulation branch including a battery cooler; The battery coolant circulation branch is coupled to the refrigerant circuit through the battery cooler.

3. The system according to claim 2, characterized in that The refrigerant circuit also includes an evaporator; The refrigerant flow passage of the evaporator is connected in parallel with the refrigerant flow passage of the battery cooler.

4. The system according to any one of claims 1 to 3, characterized in that: The refrigerant circuit also includes a second outdoor heat exchanger; The refrigerant flow channel of the second outdoor heat exchanger is connected in series with the refrigerant flow channel of the water-cooled heat exchanger.

5. The system according to claim 4, characterized in that The refrigerant flow channel of the second outdoor heat exchanger is connected in series with the refrigerant flow channel of the water-cooled heat exchanger, specifically: The refrigerant flow channel inlet of the second outdoor heat exchanger is communicated with the refrigerant flow channel outlet of the water-cooled heat exchanger.

6. The system according to claim 5, characterized in that The refrigerant circuit also includes a first expansion valve; The refrigerant flow channel inlet of the second outdoor heat exchanger is connected to the refrigerant flow channel outlet of the water-cooled heat exchanger through the first expansion valve.

7. The system according to claim 4, characterized in that The refrigerant circuit also includes a bypass valve; The bypass valve is connected in parallel with the second outdoor heat exchanger and is used to bypass the second outdoor heat exchanger in at least one operating mode.

8. The system according to claim 4, characterized in that The refrigerant circuit also includes a condenser; The refrigerant flow channel outlet of the condenser is communicated with the refrigerant flow channel inlet of the water-cooled heat exchanger.

9. The system according to any one of claims 2 or 3, characterized in that: The power unit coolant circulation branch also includes a first three-way valve and a four-way valve; The first port of the first three-way valve is communicated with the coolant flow channel outlet of the first outdoor heat exchanger, and the second port of the first three-way valve is communicated with the coolant flow channel outlet or the coolant flow channel inlet of the water-cooled heat exchanger, and the first three-way valve is used to bypass the first outdoor heat exchanger in the target working mode; The first port of the four-way valve is connected to the third port of the first three-way valve, and the second port and the third port of the four-way valve are connected to the battery coolant circulation branch, which is used to connect the battery coolant circulation branch and the power unit coolant circulation branch in series to form a coolant circulation loop in the target operating mode.

10. The system according to claim 9, characterized in that The battery coolant circulation branch also includes a second three-way valve and a battery heat exchanger; The first port of the second three-way valve is connected to the refrigerant flow outlet of the battery cooler, the second port of the second three-way valve is connected to the refrigerant flow outlet of the battery heat exchanger, and the third port of the second three-way valve is connected to the fourth port of the four-way valve, for bypassing the battery heat exchanger in at least one operating mode.

11. The system according to claim 10, characterized in that The battery coolant circulation branch also includes an electric heater; The electric heater is connected in series with the battery cooler and is used to electrically heat the coolant flowing through the battery coolant circulation branch in at least one working mode.

12. A control method for a thermal management system, characterized in that: The thermal management system comprises a power unit coolant circulation branch and a refrigerant circuit; the power unit coolant circulation branch comprises a first outdoor heat exchanger; the power unit coolant circulation branch and the refrigerant circuit are coupled via a water-cooled heat exchanger, and the coolant flow channel outlet of the water-cooled heat exchanger is connected to the coolant flow channel inlet of the first outdoor heat exchanger; The method includes: in a target working mode, controlling the refrigerant in the refrigerant circuit to release heat at the water-cooled heat exchanger, so that at least part of the heat carried by the high-temperature and high-pressure refrigerant compressed by the refrigerant circuit is dissipated into the air through the first outdoor heat exchanger.

13. The method according to claim 12, characterized in that The thermal management system further includes a battery coolant circulation branch, and the battery coolant circulation branch includes a battery cooler; the battery coolant circulation branch is coupled with the refrigerant circuit by heat exchange through the battery cooler; In the target operating mode, the refrigerant in the refrigerant circuit is controlled to evaporate and absorb heat at the battery cooler, and the target operating mode includes a combined cooling mode and a battery cooling mode.

14. The method according to claim 12, characterized in that The refrigerant circuit further includes a second outdoor heat exchanger; the refrigerant flow channel of the second outdoor heat exchanger is connected in series with the refrigerant flow channel of the water-cooled heat exchanger; The method further includes: in the target working mode, controlling the refrigerant in the refrigerant circuit to dissipate heat at the second outdoor heat exchanger, so that at least part of the heat carried by the refrigerant in the refrigerant circuit is dissipated into the air through the second outdoor heat exchanger.

15. A control device, characterized in that: It comprises a processor and a memory, wherein the memory is used to store a computer program; when the computer program is loaded by the processor, the processor executes the control method of the thermal management system according to any one of claims 12 to 14.

16. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by the processor, the processor implements the control method of the thermal management system according to claims 12 to 14.

17. A vehicle, characterized in that: Comprising a thermal management system as claimed in any one of claims 1 to 11.

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