CN111038212A

CN111038212A - Thermal management system and vehicle with same

Info

Publication number: CN111038212A
Application number: CN201911329750.2A
Authority: CN
Inventors: 陈华英
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-04-21

Abstract

The invention provides a thermal management system and a vehicle with the same, wherein the thermal management system comprises a heat pump air-conditioning subsystem, and the heat pump air-conditioning subsystem comprises: a compressor; an evaporator; the first pipeline assembly comprises a first pipeline and an oil separator, one end of the first pipeline is connected with the compressor, and the other end of the first pipeline is connected with the evaporator; the oil separator is arranged on the first pipeline and comprises an air inlet, an air outlet and an oil return port, the air inlet and the air outlet are connected with the first pipeline, and the oil return port is connected with the compressor. The heat management system solves the problem that the compressor in the heat management system in the prior art cannot return oil.

Description

Thermal management system and vehicle with same

Technical Field

The invention relates to the field of automobiles, in particular to a thermal management system and a vehicle with the same.

Background

In recent years, the new energy automobile industry enters a high-speed development stage, and the electric automobile thermal management system industry is rapidly increasing. Along with the improvement of the endurance mileage requirement of the user on the electric automobile, the electric quantity and the energy density of a power battery of the electric automobile are also continuously improved, and the service life of the battery and the endurance capacity of the whole automobile are directly influenced by a thermal management system; meanwhile, the more important the energy-saving performance of the parts of the whole vehicle is, the heat pump and the waste heat recovery are the development direction of the energy-saving research of the air conditioning system in recent years.

However, the existing thermal management system for the electric vehicle has the following problems: the oil return problem of the compressor of the heat pump system cannot be realized; the heating problem can not be realized at the ultralow temperature of the heat pump system of the automobile air conditioner; when the heat pump system heats in winter, the outer heat exchanger is easy to frost and defrost; when the heat pump system is applied to the whole vehicle, the windshield is easy to fog; there are battery cooling, heating thermal management problems and the problem of the automatically controlled cooling of the motor and waste heat recovery.

Disclosure of Invention

The invention mainly aims to provide a thermal management system and a vehicle with the same, so as to solve the problem that a compressor in the thermal management system in the prior art cannot return oil.

To achieve the above object, according to one aspect of the present invention, there is provided a thermal management system including a heat pump air conditioning subsystem including: a compressor; an evaporator; the first pipeline assembly comprises a first pipeline and an oil separator, one end of the first pipeline is connected with the compressor, and the other end of the first pipeline is connected with the evaporator; the oil separator is arranged on the first pipeline and comprises an air inlet, an air outlet and an oil return port, the air inlet and the air outlet are connected with the first pipeline, and the oil return port is connected with the compressor.

Further, the heat pump air conditioning subsystem further comprises: one end of the first connecting pipe is connected with the oil return port, and the other end of the first connecting pipe is connected with the compressor; and the first control valve is arranged on the first connecting pipe so as to control the on-off of the first connecting pipe.

Further, the first pipe assembly further comprises: the first heat exchanger is arranged on the first pipeline; the first expansion valve is arranged on the first pipeline and positioned between the first heat exchanger and the evaporator; the flash evaporator is arranged on the first pipeline and is positioned between the first expansion valve and the evaporator; the flash evaporator is connected with the compressor, so that the refrigerant is changed into a gaseous refrigerant entering the compressor and a liquid refrigerant entering the evaporator under the flash evaporation effect of the flash evaporator.

Further, the heat pump air conditioning subsystem further comprises: one end of the second connecting pipe is connected with the flash evaporator, and the other end of the second connecting pipe is connected with the compressor; and the second control valve is arranged on the second connecting pipe to control the on-off of the second connecting pipe.

Further, the heat pump air conditioning subsystem further comprises: one end of the second pipeline is connected with the evaporator, and the other end of the second pipeline is connected with the compressor; and the gas-liquid separator is arranged on the second pipeline, so that the refrigerant flows to the compressor after passing through the gas-liquid separator.

Further, the heat pump air conditioning subsystem further comprises: and the third control valve is arranged on the first pipeline and is positioned between the first heat exchanger and the oil separator.

Further, the heat pump air conditioning subsystem further comprises: a condenser; and one end of the third pipeline is connected with the air outlet of the oil separator, and the other end of the third pipeline is connected with the condenser.

Further, the heat pump air conditioning subsystem further comprises: and the fourth control valve is arranged on the third pipeline to control the on-off of the third pipeline.

Further, the heat pump air conditioning subsystem further comprises: and one end of the fourth pipeline is connected with the condenser, and the other end of the fourth pipeline is connected with the first pipeline and is positioned between the flash evaporator and the evaporator.

Further, the first pipeline is provided with a first pipe section, and the first pipe section extends to the evaporator from the connection position of the fourth pipeline and the first pipeline; the first pipeline assembly further includes a second expansion valve disposed on the first pipeline section.

Further, the heat pump air conditioning subsystem further comprises a second heat exchanger, and the second heat exchanger is arranged on the fourth pipeline.

Further, the heat pump air conditioning subsystem further comprises: and the third expansion valve is arranged on the fourth pipeline and is positioned between the second heat exchanger and the flash evaporator.

Further, the heat pump air conditioning subsystem further comprises: and one end of the fifth pipeline is connected with the first pipeline and is positioned between the first heat exchanger and the third control valve, and the other end of the fifth pipeline is connected with the second pipeline and is positioned between the gas-liquid separator and the evaporator.

The heat management system further comprises a motor and an electric control heat management subsystem, the motor and electric control heat management subsystem comprises a first loop, a radiator, an electric control system, a motor and a first water pump, and the radiator is arranged on the first loop; the electric control system is arranged on the first loop; the motor is arranged on the first loop and is positioned between the electric control system and the radiator; the first water pump is arranged on the first loop and is positioned between the radiator and the electric control system; the motor and electronic control heat management subsystem further comprises: the first three-way valve is arranged on the first loop and positioned between the radiator and the motor, and a first connecting end and a second connecting end of the first three-way valve are connected with the first loop; one end of the first branch is connected with the third connecting end of the first three-way valve, and the other end of the first branch is connected with the first loop and is positioned between the radiator and the first three-way valve; the heat pump air-conditioning subsystem further comprises a first heat exchanger, wherein the first heat exchanger is arranged on the first pipeline and is positioned between the first heat exchanger and the first expansion valve; the first heat exchanger is also disposed on the first branch.

Further, the electric machine and electronic control heat management subsystem further comprises: the second three-way valve is arranged on the first loop and positioned between the first three-way valve and the radiator, and a fourth connecting end and a fifth connecting end of the second three-way valve are both connected with the first loop; and one end of the second branch is connected with the sixth connecting end of the second three-way valve, and the other end of the second branch is connected with the first loop and is positioned between the first water pump and the electric control system.

Further, the thermal management system also includes a battery thermal management subsystem, the battery thermal management subsystem including: a second loop; the battery pack is arranged on the second loop; the second water pump is arranged on the second loop; and the second heat exchanger is also arranged on the second loop and is positioned on one side of the second water pump, which is far away from the battery pack.

Further, the heat pump air-conditioning subsystem also comprises a warm air core; the battery thermal management subsystem further comprises: the third three-way valve is arranged on the second loop and positioned between the second heat exchanger and the battery pack, and a seventh connecting end and an eighth connecting end of the third three-way valve are connected with the second loop; one end of the third branch is connected with a ninth connecting end of the third three-way valve, and the other end of the third branch is connected with the warm air core; and one end of the fourth branch is connected with the warm air core, and the other end of the fourth branch is connected with the second loop and is positioned between the second heat exchanger and the third three-way valve.

Further, the battery thermal management subsystem further comprises a heater disposed on the third branch.

Further, the heat pump air conditioning subsystem further comprises: one end of the sixth pipeline is connected with the second pipeline and is positioned between the gas-liquid separator and the evaporator, and the other end of the sixth pipeline is connected with the fourth pipeline and is positioned between the second heat exchanger and the condenser; and the fifth control valve is arranged on the sixth pipeline to control the on-off of the sixth pipeline.

According to another aspect of the invention, a vehicle is provided comprising a thermal management system, wherein the thermal management system is the thermal management system described above.

The heat management system comprises a heat pump air-conditioning subsystem, wherein the heat pump air-conditioning subsystem comprises a compressor, an evaporator and a first pipeline assembly, the heat management system is characterized in that an oil separator is arranged on the first pipeline, so that a refrigerant from the compressor enters the oil separator through an air inlet, lubricating oil mixed in the refrigerant is separated from the refrigerant and stays in the oil separator under the action of the oil separator, then the refrigerant flows to the evaporator through an air outlet, and the lubricating oil returns to the compressor through an oil return opening. The heat management system solves the problem of oil return of the compressor, and improves the reliability of the heat management system.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic diagram of an embodiment of a thermal management system according to the present invention;

FIG. 2 shows a schematic diagram of a thermal management system according to the present invention in a cooling mode;

FIG. 3 is a schematic diagram illustrating a thermal management system according to the present invention in a cooling dual temperature zone mode;

FIG. 4 is a schematic diagram illustrating a thermal management system according to the present invention in a cabin cooling + battery cooling + electrically controlled cooling mode;

FIG. 5 is a schematic diagram illustrating a thermal management system according to the present invention in a heating mode;

FIG. 6 is a schematic diagram showing a thermal management system according to the present invention in a heat pump heating + battery heating mode + electric control system and motor waste heat recovery mode;

FIG. 7 shows a schematic diagram of a thermal management system in a heater assisted heating + battery heating mode in accordance with the present invention;

FIG. 8 is a schematic diagram illustrating a thermal management system in a heating and dehumidification mode according to the present invention;

FIG. 9 shows a schematic view of a thermal management system according to the present invention in a defrost mode;

FIG. 10 illustrates a schematic of an oil separator of a thermal management system according to the present invention.

Wherein the figures include the following reference numerals:

10. a compressor; 20. an evaporator; 30. a first conduit assembly; 31. a first pipeline; 32. an oil separator; 321. an air inlet; 322. an air outlet; 323. an oil return port; 324. a gas-liquid filter screen assembly; 325. an oil filter screen assembly; 33. a first heat exchanger; 34. a first expansion valve; 35. a flash evaporator; 36. a second expansion valve; 37. a first heat exchanger; 40. a first connecting pipe; 50. a first control valve; 60. a second connecting pipe; 70. a second control valve; 80. a third control valve; 90. a second pipeline; 100. a gas-liquid separator; 110. a condenser; 120. a third pipeline; 130. a fourth control valve; 140. a fourth pipeline; 150. a third expansion valve; 160. a second heat exchanger; 170. a fifth pipeline; 171. a sixth control valve; 180. a first circuit; 190. a heat sink; 200. an electronic control system; 210. a motor; 220. a first water pump; 230. a first three-way valve; 231. a first connection end; 232. a second connection end; 233. a third connection end; 240. a first branch; 250. a second three-way valve; 251. a fourth connection end; 252. a fifth connection end; 253. a sixth connection end; 260. a second branch circuit; 270. a second loop; 280. a battery pack; 290. a second water pump; 300. a warm air core; 310. a third three-way valve; 311. a seventh connection end; 312. an eighth connection end; 313. a ninth connection end; 320. a third branch; 330. a fourth branch; 340. a sixth pipeline; 350. a fifth control valve; 360. a heater; 370. an air conditioning system.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The present invention provides a thermal management system, please refer to fig. 1 to fig. 10, including a heat pump air-conditioning subsystem, the heat pump air-conditioning subsystem includes: a compressor 10; an evaporator 20; a first pipe assembly 30, the first pipe assembly 30 including a first pipe 31 and an oil separator 32, one end of the first pipe 31 being connected to the compressor 10, and the other end of the first pipe 31 being connected to the evaporator 20; the oil separator 32 is disposed on the first pipeline 31, the oil separator 32 includes an air inlet 321, an air outlet 322, and an oil return port 323, the air inlet 321 and the air outlet 322 are both connected to the first pipeline 31, and the oil return port 323 is connected to the compressor 10.

The heat management system comprises a heat pump air-conditioning subsystem, wherein the heat pump air-conditioning subsystem comprises a compressor 10, an evaporator 20 and a first pipeline assembly 30, the heat management system is characterized in that an oil separator 32 is arranged on a first pipeline 31, so that a refrigerant discharged from the compressor 10 enters the oil separator 32 through an air inlet 321, lubricating oil mixed in the refrigerant is separated from the refrigerant and stays in the oil separator 32 under the action of the oil separator 32, then the refrigerant flows to the evaporator 20 through an air outlet 322, and the lubricating oil returns to the compressor 10 through an oil return opening 323. The heat management system solves the problem of oil return of the compressor, and improves the reliability of the heat management system.

In particular, compressor 10 is an enthalpy increasing compressor.

In this embodiment, the heat pump air conditioning subsystem further includes: a first connection pipe 40, one end of the first connection pipe 40 being connected to the oil return port 323, and the other end of the first connection pipe 40 being connected to the compressor 10; and a first control valve 50, wherein the first control valve 50 is arranged on the first connecting pipe 40 to control the on-off of the first connecting pipe 40.

Preferably, the first control valve 50 is a solenoid valve.

In this embodiment, the first pipe assembly 30 further includes: a first heat exchanger 33 disposed on the first conduit 31; a first expansion valve 34 provided on the first pipe 31 between the first heat exchanger 33 and the evaporator 20; a flash evaporator 35 disposed in the first line 31 between the first expansion valve 34 and the evaporator 20; the flash evaporator 35 is connected to the compressor 10, so that the refrigerant is changed into a gaseous refrigerant for entering the compressor 10 and a liquid refrigerant for entering the evaporator 20 by the flash evaporation of the flash evaporator 35.

In this embodiment, the heat pump air conditioning subsystem further includes: one end of the second connection pipe 60 is connected to the flash evaporator 35, and the other end of the second connection pipe 60 is connected to the compressor 10; and a second control valve 70, the second control valve 70 being provided on the second connection pipe 60 to control the on/off of the second connection pipe 60.

Preferably, the second control valve 70 is a solenoid valve.

In this embodiment, the heat pump air conditioning subsystem further includes: a second pipe 90, one end of the second pipe 90 being connected to the evaporator 20, and the other end of the second pipe 90 being connected to the compressor 10; and a gas-liquid separator 100 disposed on the second pipeline 90, so that the refrigerant flows to the compressor 10 after passing through the gas-liquid separator 100.

In this embodiment, the heat pump air conditioning subsystem further includes: and a third control valve 80 provided on the first pipe 31 between the first heat exchanger 33 and the oil separator 32.

Preferably, the third control valve 80 is a solenoid valve.

In this embodiment, the heat pump air conditioning subsystem further includes: a condenser 110; and a third pipeline 120, one end of the third pipeline 120 being connected to the air outlet 322 of the oil separator 32, and the other end of the third pipeline 120 being connected to the condenser 110.

In this embodiment, the heat pump air conditioning subsystem further includes: and a fourth control valve 130 disposed on the third pipeline 120 to control the on/off of the third pipeline 120.

Preferably, the fourth control valve 130 is a solenoid valve.

In this embodiment, the heat pump air conditioning subsystem further includes: and a fourth pipe 140, wherein one end of the fourth pipe 140 is connected to the condenser 110, and the other end of the fourth pipe 140 is connected to the first pipe 31 and is located between the flash evaporator 35 and the evaporator 20.

In the present embodiment, the first pipe 31 has a first pipe section extending from the junction of the fourth pipe 140 and the first pipe 31 to the evaporator 20; the first conduit assembly 30 also includes a second expansion valve 36, the second expansion valve 36 being disposed on the first conduit section.

In this embodiment, the heat pump air conditioning subsystem further includes a second heat exchanger 160, and the second heat exchanger 160 is disposed on the fourth pipe 140.

In this embodiment, the heat pump air conditioning subsystem further includes: a third expansion valve 150, the third expansion valve 150 being disposed on the fourth conduit 140 between the second heat exchanger 160 and the flash evaporator 35.

In this embodiment, the heat pump air conditioning subsystem further includes: and a fifth pipe 170, one end of the fifth pipe 170 being connected to the first pipe 31 and located between the first heat exchanger 33 and the third control valve 80, and the other end of the fifth pipe 170 being connected to the second pipe 90 and located between the gas-liquid separator 100 and the evaporator 20.

In a specific embodiment, the fifth pipeline 170 is provided with a sixth control valve 171, and the sixth control valve 171 is a solenoid valve.

In this embodiment, the thermal management system further includes a motor and an electronic control thermal management subsystem, the motor and electronic control thermal management subsystem includes a first loop 180, a radiator 190, an electronic control system 200, a motor 210 and a first water pump 220, and the radiator 190 is disposed on the first loop 180; the electronic control system 200 is arranged on the first loop 180; the motor 210 is arranged on the first loop 180 and positioned between the electronic control system 200 and the radiator 190; the first water pump 220 is arranged on the first circuit 180 and between the radiator 190 and the electronic control system 200; the motor and electronic control heat management subsystem further comprises: a first three-way valve 230, the first three-way valve 230 being disposed on the first circuit 180 between the radiator 190 and the motor 210, a first connection end 231 and a second connection end 232 of the first three-way valve 230 both being connected to the first circuit 180; one end of the first branch 240 is connected to the third connection end 233 of the first three-way valve 230, and the other end of the first branch 240 is connected to the first circuit 180 and is located between the radiator 190 and the first three-way valve 230; wherein, the heat pump air-conditioning subsystem further comprises a first heat exchanger 37, the first heat exchanger 37 is arranged on the first pipeline 31 and is positioned between the first heat exchanger 33 and the first expansion valve 34; the first heat exchanger 37 is also provided on the first branch 240.

In this embodiment, the electric machine and electronic control heat management subsystem further includes: a second three-way valve 250, the second three-way valve 250 being disposed on the first circuit 180 between the first three-way valve 230 and the radiator 190, a fourth connection end 251 and a fifth connection end 252 of the second three-way valve 250 being connected to the first circuit 180; and one end of the second branch 260 is connected to a sixth connection end 253 of the second three-way valve 250, and the other end of the second branch 260 is connected to the first circuit 180 and is located between the first water pump 220 and the electronic control system 200.

In this embodiment, the thermal management system further includes a battery thermal management subsystem, and the battery thermal management subsystem includes: a second loop 270; a battery pack 280 provided on the second circuit 270; a second water pump 290 provided on the second circuit 270; wherein the second heat exchanger 160 is also disposed on the second circuit 270, and the second heat exchanger 160 is located on a side of the second water pump 290 away from the battery pack 280.

In this embodiment, the heat pump air conditioning subsystem further includes a warm air core 300; the battery thermal management subsystem further comprises: a third three-way valve 310, the third three-way valve 310 being disposed on the second circuit 270 between the second heat exchanger 160 and the battery pack 280, a seventh connection end 311 and an eighth connection end 312 of the third three-way valve 310 being connected to the second circuit 270; one end of the third branch 320 is connected to the ninth connection end 313 of the third three-way valve 310, and the other end of the third branch 320 is connected to the heater core 300; and a fourth branch 330, one end of the fourth branch 330 being connected to the core 300, and the other end of the fourth branch 330 being connected to the second circuit 270 and being located between the second heat exchanger 160 and the third three-way valve 310.

In this embodiment, the battery thermal management subsystem further includes a heater 360, the heater 360 being disposed on the third leg 320.

Preferably, heater 360 is a PCT heater.

In this embodiment, the heat pump air conditioning subsystem further includes: a sixth pipe 340, one end of the sixth pipe 340 being connected to the second pipe 90 and located between the gas-liquid separator 100 and the evaporator 20, and the other end of the sixth pipe 340 being connected to the fourth pipe 140 and located between the second heat exchanger 160 and the condenser 110; and a fifth control valve 350 disposed on the sixth pipeline 340 to control on/off of the sixth pipeline 340.

Preferably, the fifth control valve 350 is a solenoid valve.

In another embodiment, the second control valve 70 and the fourth control valve 130 may be combined into a three-way solenoid valve to realize the function of mode switching.

In the present embodiment, the compressor is a two-stage compressor. In another embodiment, the compressor is a single stage compressor, with associated components for two-stage compression: the first expansion valve, flash evaporator 35, second control valve 70 and associated piping are eliminated.

In this embodiment, the heat management system includes a heat pump air-conditioning subsystem, a battery heat management subsystem, a motor and an electronic control heat management subsystem, and the heat pump air-conditioning subsystem, the battery heat management subsystem, the motor and the electronic control heat management subsystem are coupled with each other to realize modes of cooling, heating, dehumidifying and the like of the vehicle cabin, realize cooling and heating of the battery, cooling of the motor and the electronic control system, realize waste heat recovery and the like.

In the present embodiment, the heat pump Air Conditioning subsystem includes an Air Conditioning system 370, i.e., HVAC (Heating, Ventilation and Air Conditioning); the air conditioning system includes an evaporator 20, a condenser 110, and a warm air core 300.

In particular embodiments, the oil separator 32 further includes a gas-liquid screen assembly 324 and an oil screen assembly 325.

The thermal management system realizes system oil return by additionally arranging the oil separator 32, and ensures the reliability of the system; as shown in fig. 10, the refrigerant enters the oil separator through the air inlet 321, and passes through the gas-liquid filter screen assembly 324 and the oil filter screen assembly 325 at a high speed to separate the lubricating oil from the refrigerant; the separated refrigerant continues to circulate through the air outlet 322, the separated lubricating oil sinks to the bottom of the oil separator 32, the oil return port 323 is arranged at the bottom of the oil separator 32, the oil return port 323 is communicated with the air suction low-pressure side of the compressor 10, and the lubricating oil returns to the compressor 10 through the oil return port, so that effective oil return is realized.

In this embodiment, the thermal management system has a refrigeration mode, as shown in fig. 2, the compressor 10 exhausts air, enters the oil separator for oil-gas separation, enters the first heat exchanger 33 through the third control valve 80 for condensation and heat dissipation, passes through the first heat exchanger 37, performs primary throttling through the first expansion valve 34, then enters the flash evaporator 35 for flash evaporation, the refrigerant after flash evaporation is divided into two paths, the gaseous refrigerant enters the air supplement port of the compressor through the second control valve 70 for air supplement and enthalpy increase, the liquid refrigerant enters the second expansion valve 36 through the first pipeline 31 for secondary throttling, the throttled low-temperature and low-pressure refrigerant enters the evaporator 20 for heat absorption and evaporation, and returns to the air suction port of the compressor through the gas-liquid separator 100, thereby completing a cycle.

In this embodiment, the thermal management system has a cooling dual temperature zone mode, i.e., a summer dehumidification mode; as shown in fig. 3, in this mode, the thermal management system maintains the cooling mode, the second water pump 290 of the battery thermal management subsystem is turned on, the coolant passes through the battery pack 280, carries the generated heat out, passes through the third three-way valve 310, the third branch 320, enters the warm air core 300, and returns to the second water pump 290 through the fourth branch 330 and the second loop 270, thereby completing the complete cycle; in this case, the HVAC has both a cold source (evaporator 20) and a heat source (warm air core 300); the HVAC realizes different air mixing through the opening and closing angles of the left air door and the right air door, and achieves the function of dividing the left temperature and the right temperature of the vehicle cabin into zones; meanwhile, in this mode, the HVAC outlet air firstly passes through the cold source (evaporator 20) and then passes through the heat source (warm air core 300), so as to realize the dehumidification mode.

In the embodiment, the thermal management system has a vehicle cabin refrigeration mode, a battery cooling mode and an electronic control cooling mode; as shown in fig. 4, when summer or the load of the whole vehicle is large, the mode can be started when the battery, the motor and the electric control system need to be cooled after the vehicle cabin is cooled; at this time, the thermal management system maintains the refrigeration cycle mode, the third expansion valve 150 and the fifth control valve 350 are opened, and the refrigerant is throttled by the third expansion valve 150 to form a low-temperature and low-pressure liquid, and then enters the second heat exchanger 160; the battery thermal management subsystem is turned on and as shown, the second water pump 290 is activated and coolant passes through the battery pack 280 and carries heat out into the second heat exchanger 160. In the second heat exchanger 160, the low-temperature refrigerant cools the high-temperature coolant, and the cooled coolant enters the battery through the second water pump 290 to take away heat of the battery pack 280, so that the battery pack 280 is cooled.

Specifically, when the thermal management system detects that the battery pack 280 needs large cooling capacity for cooling, such as during quick charging, the second expansion valve 36 may be selectively closed, and all cooling capacity of the thermal management system is concentrated in the second heat exchanger 160 to cool the battery pack 280; meanwhile, the third three-way valve 310 can select the seventh connecting end 311 and the eighth connecting end 312 to be conducted, or the seventh connecting end 311 and the ninth connecting end 313 to be conducted, when the cabin has no double-temperature or dehumidification requirement, the seventh connecting end 311 and the eighth connecting end 312 can be selected to be conducted, the cooling liquid loop is shortened, and when the cabin has the double-temperature or dehumidification requirement, the seventh connecting end 311 and the ninth connecting end 313 can be selected to be conducted, so that heat can reach the warm air core 300.

Specifically, when it is detected that the motor and the electric control system need to be cooled, the first water pump 220 is started, the cooling liquid carries heat out through the electric control system and the motor, enters the radiator 190 by conducting the first connecting end 231 and the second connecting end 232 of the first three-way valve 230 and conducting the fourth connecting end 251 and the fifth connecting end 252 of the second three-way valve 250, the heat is dissipated through the radiator 190, the cooled cooling liquid passes through the first water pump 220, circulation is completed, and cooling of the electric control system and the motor is achieved.

In this embodiment, the thermal management system has a heating mode; as shown in fig. 5, the compressor 10 exhausts air, enters the oil separator for oil-gas separation, enters the condenser 110 through the fourth control valve 130, condenses and dissipates heat in the condenser 110, the HVAC absorbs low-temperature air, and blows out the air after the air temperature rises through the high-temperature condenser 110, so as to realize cabin heating; the refrigerant passes through the second heat exchanger 160 after coming out of the condenser 110, is subjected to primary throttling by the third expansion valve 150, then enters the flash evaporator 35 for flashing, the flashed refrigerant is divided into two paths, the gaseous refrigerant enters the air supplement port of the compressor through the first control valve 50 for air supplement and enthalpy increase, the liquid refrigerant enters the first expansion valve 34 through the first pipeline 31 for secondary throttling, the throttled low-temperature and low-pressure refrigerant enters the first heat exchanger 33 for heat absorption and evaporation, and returns to the air suction port of the compressor through the sixth control valve 171 and the gas-liquid separator 100, so that a cycle is completed.

In this embodiment, the thermal management system has a heat pump heating mode, a battery heating mode, a recovery electric control system and a motor waste heat mode; as shown in fig. 6; the thermal management system maintains the thermal mode, the battery thermal management subsystem is started, the second water pump 290 is started, the cooling liquid enters the battery pack 280, enters the second heat exchanger 160 after passing through the seventh connecting end 311 and the eighth connecting end 312 of the third three-way valve 310, the high-temperature refrigerant heats the cooling liquid in the second heat exchanger 160, and the heated cooling liquid enters the battery pack 280 through the second water pump 290 and heats the battery pack 280.

Specifically, in general, when the thermal management system is in a heating mode, heat exchange is performed outside the first heat exchanger 33 to evaporate and absorb heat; the heat management system can recover waste heat of the motor and the electric control system to be used for evaporation of the heat pump system; as shown in fig. 6, after the refrigerant circulates through the first expansion valve 34, the refrigerant reaching the first heat exchanger 37 is at a low temperature and a low pressure, at this time, by starting the motor and the electronic control thermal management subsystem, the first water pump 220 is started, the coolant passes through the electronic control system and the motor, is heated, and then enters the first heat exchanger 37 through the first connection end 231 and the third connection end 233 of the first three-way valve 230, in the first heat exchanger 37, the high-temperature coolant heats the low-temperature refrigerant, and the waste heat is utilized to increase the heat absorption capacity of the heat pump at the same time, so that the system performance is improved; meanwhile, the temperature of the refrigerant entering the first heat exchanger 33 is increased after the refrigerant is heated, the temperature difference between the refrigerant and air in the first heat exchanger 33 is reduced, and heat exchange frosting is effectively slowed down.

In this embodiment, the thermal management system has a heater auxiliary heating mode and a battery heating mode, when the heat pump cannot meet the requirement of cabin heating under an extremely cold condition, the heater auxiliary heating in the battery thermal management subsystem can be started, as shown in fig. 7, the heater is started, the second water pump 290 drives the coolant to enter the heater through the seventh connecting end 311 and the ninth connecting end 313 of the third three-way valve 310, the coolant enters the hot air core 300 after being heated, and the HVAC air door is switched to enable air to pass through the hot air core 300, and the air is heated and blown out to meet the requirement of heating under an extremely cold condition; the cooling liquid passes through the battery pack 280 through a pipeline to heat the battery pack 280; under the extremely cold condition, the electric control system and the motor can be used without waste heat, the auxiliary heat absorption as shown in fig. 7 can be started, the refrigerant reaching the first heat exchanger 37 is low-temperature and low-pressure after being throttled by the first expansion valve 34 in a circulating manner, the first water pump 220 is started, the cooling liquid enters the first heat exchanger 37 through the sixth connecting end 253 and the fourth connecting end 251 of the second three-way valve 250, the second connecting end 232 and the third connecting end 233 of the first three-way valve 230, and exchanges heat with the low-temperature refrigerant in the first heat exchanger 37, the refrigerant is heated, and the cooling liquid is cooled; the cooled coolant enters the radiator 190, absorbs heat with air, and circulates in this manner.

In the embodiment, the heat management system has a heating and dehumidifying mode; as shown in fig. 8, the dehumidification mode or the closed dehumidification mode can be realized by opening or closing the second expansion valve 36 on the basis of the heating mode being opened.

In this embodiment, the thermal management system has a defrosting mode, as shown in fig. 9, during defrosting, the compressor exhausts air, the third control valve 80 enters the first heat exchanger 33 to defrost, the refrigerant passes through the first heat exchanger 37 after being cooled, and then passes through the first expansion valve 34, the flash evaporator 35, the third expansion valve 150, the second heat exchanger 160, the fifth control valve 350, and the gas-liquid separator 100, and then returns to the compressor, thereby completing the refrigerant circuit circulation; in order to ensure complete evaporation in the defrosting process, cold air is not blown out from the inner side; the motor and the electric control heat management subsystem are started, and the refrigerant is heated in the first heat exchanger 37 through waste heat of the motor and the electric control system; meanwhile, the battery heat management subsystem is started, the heater is synchronously started, the heated coolant enters the warm air core 300, the continuous heating requirement of the vehicle cabin is guaranteed, the coolant is heated by the heated coolant in the second heat exchanger 160, the coolant absorbs heat and evaporates completely, the problem of liquid impact caused by incomplete evaporation in the defrosting process is avoided, and the reliability of the system is guaranteed.

The invention also solves the following technical problems:

1. the problem that heating cannot be realized at ultralow temperature of the thermal management system is solved.

2. The problem of thermal management system compressor oil return is solved.

3. The problem of first heat exchanger frost formation when heat management system heats winter is solved.

4. The problem that the windshield is fogged when the heat management system is applied to the whole vehicle is solved; the problem of left and right subareas of the air conditioning system.

5. The cooling and heating heat management problems of the battery, and the cooling and waste heat recovery problems of the motor and the electric control system are solved.

The invention has the beneficial effects that:

1. an air-supplying and enthalpy-increasing system is adopted, and the lowest operation temperature of the system can be as low as-15 ℃.

2. And an oil separator and oil return control are arranged, so that the problem of oil return of the system is solved, and the reliability of the system is improved.

3. The waste heat recovery of the motor and the electric control heat management subsystem is synchronously coupled with the heat pump air-conditioning subsystem, so that the problem of frosting and defrosting of the first heat exchanger of the heat pump air-conditioning subsystem is solved.

4. The battery heat management subsystem is coupled with the heat pump air-conditioning subsystem, so that the battery pack can be effectively cooled and heated in time, the double-temperature-zone dehumidification function of the heat pump air-conditioning subsystem is realized, and the comfort is improved.

The innovation points of the invention are as follows:

1. an oil separator is added, when the compressor exhausts air and passes through the oil separator at high pressure and high temperature, oil and refrigerant are separated, the separated refrigerant passes through an air outlet 322 to be circulated by a heat pump air conditioning subsystem, the separated oil is stored at the bottom of the oil separator and returns to an air suction port of the compressor through an oil return port 323 through oil return control of the system, and oil return of the compressor is ensured; meanwhile, the oil separator also has the noise reduction function, and reduces liquid flow sound caused by the flowing of a system refrigerant.

2. The motor and electric control heat management subsystem is provided with the first heat exchanger 37 which is coupled with the heat pump air-conditioning subsystem, so that waste heat recovery of the motor and the electric control system is realized, the recovered heat improves the evaporation effect of the heat pump air-conditioning subsystem, the temperature of a refrigerant entering the evaporator of the heat pump air-conditioning subsystem is improved, and the frosting of the evaporator can be effectively reduced; when the heat pump air-conditioning subsystem enters into defrosting, waste heat of the motor, the electric control system and the battery is used for heating and evaporating, liquid impact caused by insufficient evaporation in the defrosting process is avoided, stable heat output in the vehicle is guaranteed, and reliability and comfort of the system are improved.

3. The motor and electronic control heat management subsystem is provided with a first heat exchanger 37 which is coupled with the heat pump air conditioning subsystem, and when the motor and the electronic control system are in an extreme cold working condition or have no waste heat, the heat pump air conditioning subsystem and the heat dissipation water tank form a local system, so that heat is absorbed by the evaporation side of the heat pump air conditioning subsystem, the evaporation capacity of the system is improved, and the capacity of the system is improved.

4. The battery thermal management subsystem is coupled with the heat pump air conditioning subsystem, so that the battery pack is rapidly cooled at high temperature and heated at low temperature, and the temperature control of the battery pack is ensured; meanwhile, the waste heat of the battery pack can be utilized to realize the dual-temperature area and the dehumidification mode of the heat pump air-conditioning subsystem; the reliability of the battery pack is guaranteed, and the comfort is improved.

The invention further provides a vehicle which comprises the thermal management system, wherein the thermal management system is the thermal management system in the embodiment.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal management system comprising a heat pump air conditioning subsystem, the heat pump air conditioning subsystem comprising:

a compressor (10);

an evaporator (20);

a first pipe assembly (30), the first pipe assembly (30) comprising a first pipe (31) and an oil separator (32), one end of the first pipe (31) being connected to the compressor (10), the other end of the first pipe (31) being connected to the evaporator (20);

the oil separator (32) is arranged on the first pipeline (31), the oil separator (32) comprises an air inlet (321), an air outlet (322) and an oil return port (323), the air inlet (321) and the air outlet (322) are connected with the first pipeline (31), and the oil return port (323) is connected with the compressor (10).

2. The thermal management system of claim 1, wherein the heat pump air conditioning subsystem further comprises:

one end of the first connecting pipe (40) is connected with the oil return port (323), and the other end of the first connecting pipe (40) is connected with the compressor (10);

a first control valve (50), wherein the first control valve (50) is arranged on the first connecting pipe (40) to control the on-off of the first connecting pipe (40).

3. The thermal management system of claim 1, wherein the first tube assembly (30) further comprises:

a first heat exchanger (33) arranged on the first line (31);

a first expansion valve (34) disposed on the first conduit (31) between the first heat exchanger (33) and the evaporator (20);

a flash evaporator (35) disposed on the first line (31) between the first expansion valve (34) and the evaporator (20); the flash evaporator (35) is connected with the compressor (10) so that the refrigerant is changed into a gaseous refrigerant entering the compressor (10) and a liquid refrigerant entering the evaporator (20) under the flash evaporation effect of the flash evaporator (35).

4. The thermal management system of claim 3, wherein the heat pump air conditioning subsystem further comprises:

a second connection pipe (60), one end of the second connection pipe (60) being connected to the flash evaporator (35), and the other end of the second connection pipe (60) being connected to the compressor (10);

a second control valve (70), wherein the second control valve (70) is arranged on the second connecting pipe (60) to control the on-off of the second connecting pipe (60).

5. The thermal management system of claim 3, wherein the heat pump air conditioning subsystem further comprises:

a second pipe (90), one end of the second pipe (90) being connected to the evaporator (20), the other end of the second pipe (90) being connected to the compressor (10);

and a gas-liquid separator (100) disposed on the second pipeline (90) to allow the refrigerant to flow to the compressor (10) after passing through the gas-liquid separator (100).

6. The thermal management system of claim 5, wherein the heat pump air conditioning subsystem further comprises:

a third control valve (80) disposed on the first conduit (31) between the first heat exchanger (33) and the oil separator (32).

7. The thermal management system of claim 5, wherein the heat pump air conditioning subsystem further comprises:

a condenser (110);

and one end of the third pipeline (120) is connected with the air outlet (322) of the oil separator (32), and the other end of the third pipeline (120) is connected with the condenser (110).

8. The thermal management system of claim 7, wherein the heat pump air conditioning subsystem further comprises:

and the fourth control valve (130) is arranged on the third pipeline (120) to control the on-off of the third pipeline (120).

9. The thermal management system of claim 7, wherein the heat pump air conditioning subsystem further comprises:

a fourth pipeline (140), wherein one end of the fourth pipeline (140) is connected with the condenser (110), and the other end of the fourth pipeline (140) is connected with the first pipeline (31) and is positioned between the flash evaporator (35) and the evaporator (20).

10. The thermal management system of claim 9, wherein the first line (31) has a first pipe section extending from a connection of the fourth line (140) and the first line (31) to the evaporator (20); the first pipe assembly (30) further comprises a second expansion valve (36), the second expansion valve (36) being arranged on the first pipe section.

11. The thermal management system of claim 9, wherein the heat pump air conditioning subsystem further comprises a second heat exchanger (160), the second heat exchanger (160) being disposed on the fourth tube (140).

12. The thermal management system of claim 11, wherein the heat pump air conditioning subsystem further comprises:

a third expansion valve (150), the third expansion valve (150) disposed on the fourth line (140) between the second heat exchanger (160) and the flash evaporator (35).

13. The thermal management system of claim 6, wherein the heat pump air conditioning subsystem further comprises:

a fifth pipeline (170), one end of the fifth pipeline (170) is connected with the first pipeline (31) and is positioned between the first heat exchanger (33) and the third control valve (80), and the other end of the fifth pipeline (170) is connected with the second pipeline (90) and is positioned between the gas-liquid separator (100) and the evaporator (20).

14. The thermal management system of claim 3, further comprising an electric machine and electronically controlled thermal management subsystem, the electric machine and electronically controlled thermal management subsystem comprising a first circuit (180), a heat sink (190), an electronic control system (200), an electric machine (210), and a first water pump (220), the heat sink (190) disposed on the first circuit (180); the electronic control system (200) is arranged on the first circuit (180); the electric motor (210) is arranged on the first circuit (180) and is positioned between the electric control system (200) and the radiator (190); the first water pump (220) is arranged on the first circuit (180) and is positioned between the radiator (190) and the electronic control system (200); the motor and electronic control heat management subsystem further comprises:

a first three-way valve (230), the first three-way valve (230) being disposed on the first circuit (180) between the radiator (190) and the motor (210), a first connection end (231) and a second connection end (232) of the first three-way valve (230) both being connected to the first circuit (180);

a first branch (240), one end of the first branch (240) being connected to a third connection end (233) of the first three-way valve (230), the other end of the first branch (240) being connected to the first circuit (180) and being located between the radiator (190) and the first three-way valve (230);

wherein the heat pump air conditioning subsystem further comprises a first heat exchanger (37), the first heat exchanger (37) being disposed on the first line (31) between the first heat exchanger (33) and the first expansion valve (34); the first heat exchanger (37) is also arranged on the first branch (240).

15. The thermal management system of claim 14, wherein said electrical machine and electronically controlled thermal management subsystem further comprises:

a second three-way valve (250), the second three-way valve (250) being disposed on the first circuit (180) between the first three-way valve (230) and the radiator (190), a fourth connection end (251) and a fifth connection end (252) of the second three-way valve (250) being connected to the first circuit (180);

one end of the second branch (260) is connected with a sixth connecting end (253) of the second three-way valve (250), and the other end of the second branch (260) is connected with the first circuit (180) and is located between the first water pump (220) and the electric control system (200).

16. The thermal management system of claim 11, further comprising a battery thermal management subsystem, the battery thermal management subsystem comprising:

a second circuit (270);

a battery pack (280) disposed on the second circuit (270);

a second water pump (290) disposed on the second circuit (270);

wherein the second heat exchanger (160) is further disposed on the second circuit (270), the second heat exchanger (160) being located on a side of the second water pump (290) away from the battery pack (280).

17. The thermal management system of claim 16, wherein the heat pump air conditioning subsystem further comprises a warm air core (300); the battery thermal management subsystem further comprises:

a third three-way valve (310), the third three-way valve (310) being disposed on the second circuit (270) between the second heat exchanger (160) and the battery pack (280), a seventh connection end (311) and an eighth connection end (312) of the third three-way valve (310) being connected to the second circuit (270);

one end of the third branch (320) is connected with a ninth connection end (313) of the third three-way valve (310), and the other end of the third branch (320) is connected with the warm air core (300);

a fourth branch (330), one end of the fourth branch (330) being connected to the warm air core (300), and the other end of the fourth branch (330) being connected to the second circuit (270) and being located between the second heat exchanger (160) and the third three-way valve (310).

18. The thermal management system of claim 17, wherein the battery thermal management subsystem further comprises a heater (360), the heater (360) being disposed on the third leg (320).

19. The thermal management system of claim 11, wherein the heat pump air conditioning subsystem further comprises:

a sixth pipe (340), one end of the sixth pipe (340) being connected to the second pipe (90) and being located between the gas-liquid separator (100) and the evaporator (20), the other end of the sixth pipe (340) being connected to the fourth pipe (140) and being located between the second heat exchanger (160) and the condenser (110);

and the fifth control valve (350) is arranged on the sixth pipeline (340) and used for controlling the on-off of the sixth pipeline (340).

20. A vehicle comprising a thermal management system, wherein the thermal management system is the thermal management system of any of claims 1-19.