A new energy vehicle thermal management system and vehicle

Abstract

The application belongs to the technical field of automobile thermal management, and particularly relates to a new energy automobile thermal management system and automobile, which comprises a heat pump air conditioner refrigerant subsystem and a cooling liquid loop subsystem; the heat pump air conditioner refrigerant subsystem comprises a compressor, a water-cooled condenser, a first three-way valve, a first electronic expansion valve, an evaporator, a second electronic expansion valve, a second three-way valve, a check valve, a stop valve, an evaporative condenser and a third electronic expansion valve; the cooling liquid loop subsystem comprises a water-cooled condenser loop which is sequentially communicated by a second electronic water pump, the water-cooled condenser, a second three-way water valve and a heater core. The application effectively solves the problems of insufficient refrigeration capacity for battery fast charging cooling and passenger cabin refrigeration at high temperature and low heat pump heating energy efficiency ratio at low temperature in the prior art, and effectively improves the energy efficiency ratio and the cruising range of the automobile.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of automobile thermal management, and particularly relates to a new energy automobile thermal management system and an automobile. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] With the rapid development of automobile technology, in recent years, the share of electric vehicles in vehicles is getting higher and higher. Electric vehicles are powered by batteries, and not only need to cool the batteries to ensure the safe and efficient operation of the batteries, but also need to meet the comfort and safety of the passenger compartment.

[0004] To meet the user's super-fast charging needs, the 800V large charging power brings an increase in the battery's cooling capacity, and the intelligent driving control module's water cooling heat dissipation capacity is improved. At the same time, the passenger compartment also needs to be cooled and comfortable at high temperatures. The overall thermal load is constantly increasing, and the front compartment of the electric vehicle has limited heat dissipation module layout boundaries. At present, a single air heat exchanger condenser and radiator cannot take away the high load heat, which will directly affect the overall high-temperature thermal management performance, and in severe cases, cause the battery to overheat and cause a fire. Therefore, an efficient thermal management system solution plays an important role in the safety of electric vehicle thermal management.

[0005] To meet the user's heating comfort and battery heating needs at low temperatures, improve the energy efficiency ratio of the heat pump system to improve the electric vehicle's range and eliminate the user's range anxiety, the current electric vehicle thermal management system faces serious challenges. According to the inventor's understanding, the existing automobile thermal management has the problems of insufficient refrigeration capacity when the battery fast charging and passenger compartment refrigeration are required at high temperatures, and low energy consumption ratio and serious range degradation when the user heats at low temperatures. SUMMARY

[0006] To solve the above problems, the present application provides a new energy automobile thermal management system and an automobile, which solves the problems of insufficient refrigeration capacity when the battery fast charging and passenger compartment refrigeration are required at high temperatures in the prior art, and low energy efficiency ratio of the heat pump when heating at low temperatures, effectively improving the energy efficiency ratio and range of the automobile.

[0007] According to some embodiments, the first aspect of the present application provides a new energy automobile thermal management system, which adopts the following technical scheme:

[0008] A new energy automobile thermal management system, comprising a heat pump air conditioner refrigerant subsystem and a cooling liquid circuit subsystem;

[0009] The heat pump air conditioner refrigerant subsystem comprises a compressor, a water-cooled condenser, a first three-way valve, a first electronic expansion valve, an evaporator, a second electronic expansion valve, a second three-way valve, a check valve, a stop valve, an evaporative condenser and a third electronic expansion valve;

[0010] The cooling liquid circuit subsystem comprises a water-cooled condenser circuit sequentially connected by a second electronic water pump, the water-cooled condenser, a second three-way water valve and a heater core.

[0011] The compressor is connected to the water-cooled condenser, the outlet of the first electronic expansion valve is connected to the inlet of a battery cooler, the outlet of the second electronic expansion valve is connected to the inlet of the evaporator, the outlet of the evaporator is connected to the second three-way valve, the third electronic expansion valve is connected to the inlet of the evaporative condenser, and the outlet of the evaporative condenser is connected to the inlet of the stop valve and the inlet of the check valve respectively.

[0012] The heat pump air conditioner refrigerant subsystem is connected to the cooling liquid circuit subsystem through the control of the opening and closing states of the first three-way valve, the second three-way valve and the stop valve, and the cooling liquid circuit subsystem is connected to the heat pump air conditioner refrigerant subsystem through the control of the opening and closing state of the second three-way water valve, so as to realize the functions of passenger cabin refrigeration mode, battery cooling mode, passenger cabin heating mode, battery heating mode and passenger cabin dehumidification mode respectively.

[0013] As a further technical limitation, the heat pump air conditioner refrigerant subsystem further comprises a liquid storage dryer, a battery cooler, a first coaxial pipe and a second coaxial pipe; the inlet of the compressor is connected to the low-pressure outlet of the first coaxial pipe and the low-pressure outlet of the second coaxial pipe respectively, the outlet of the compressor is connected to the inlet of the water-cooled condenser through a refrigerant pipeline, the outlet of the water-cooled condenser is connected to the inlet of the liquid storage dryer through a refrigerant pipeline, the outlet of the liquid storage dryer is connected to the first three-way valve through a refrigerant pipeline, the other interface of the first three-way valve is connected to the check valve and the high-pressure inlet of the first coaxial pipe respectively, and the high-pressure outlet of the first coaxial pipe is connected to the inlet of the first electronic expansion valve and the inlet of the second electronic expansion valve respectively.

[0014] Further, the first electronic expansion valve outlet is connected to the battery cooler inlet through a refrigerant pipeline, the battery cooler outlet is connected to the first coaxial pipe low-pressure section, the second electronic expansion valve outlet is connected to the evaporator inlet through a refrigerant pipeline, the evaporator outlet is connected to the second three-way valve through a refrigerant pipeline, the second three-way valve is connected to the first coaxial pipe low-pressure inlet, another interface of the second three-way valve is connected to the second coaxial pipe medium-pressure end inlet, the second coaxial pipe medium-pressure end outlet is connected to the third electronic expansion valve inlet and the first three-way valve respectively, the third electronic expansion valve is connected to the evaporative condenser inlet through a refrigerant pipeline, the evaporative condenser outlet is connected to the stop valve inlet and the one-way valve inlet through a refrigerant pipeline respectively, the stop valve outlet is connected to the second coaxial pipe low-pressure end inlet, and the second coaxial pipe low-pressure end outlet is connected to the first coaxial pipe low-pressure end outlet.

[0015] As a further technical limitation, the heat pump air conditioning refrigerant subsystem further comprises a blower arranged on the air inlet side of the evaporator for accelerating the heat exchange rate of the evaporator and the ventilation of the passenger cabin.

[0016] As a further technical limitation, when the heat pump air conditioning refrigerant subsystem executes the passenger cabin cooling mode and the battery cooling mode, the high-temperature and high-pressure gas refrigerant at the outlet of the compressor is condensed twice through the water-cooled condenser and the evaporative condenser, releasing the compressor power consumption, the passenger cabin heat load and the battery pack heat load.

[0017] As a further technical limitation, when the heat pump air conditioning refrigerant subsystem executes the passenger cabin heating mode and the battery heating mode, secondary throttling is realized through the second electronic expansion valve throttling at the evaporator inlet and the third electronic expansion valve throttling at the evaporative condenser inlet in series.

[0018] As a further technical limitation, the cooling liquid circuit subsystem further comprises an electric drive circuit, the electric drive circuit comprising a first electronic water pump, an electric control CDU, a drive motor, a first three-way water valve, a low-temperature radiator and a first expansion water pot connected in sequence, wherein the radiator outlet water pipe branch exhaust pipe is connected to the degassing port of the first expansion water pot.

[0019] As a further technical limitation, the cooling liquid circuit subsystem further comprises a battery circuit, the battery circuit comprising a third electronic water pump, a third three-way water valve, a battery cooler, a battery pack and a second expansion water pot connected in sequence.

[0020] As a further technical limitation, the cooling liquid circuit subsystem further comprises a cooling fan arranged on the air exhaust side of the evaporative condenser for accelerating the heat exchange rate of the low-temperature radiator and the evaporative condenser.

[0021] According to some embodiments, a second aspect of the present application provides an automobile, which adopts the following technical solutions:

[0022] An automobile adopts the new energy automobile thermal management system provided in the first aspect.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] In the passenger cabin refrigeration mode and the battery cooling mode, the refrigerant circuit in the application passes through the water-cooled condenser and the evaporative condenser in series, realizes two-stage condensation, thereby improving the refrigeration performance and the energy efficiency ratio of the heat pump system, and solving the problem of insufficient refrigerating capacity when the battery fast charging and the passenger cabin refrigeration are simultaneously required at high temperature; in the passenger cabin heating mode and the battery heating mode, the refrigerant circuit passes through the second electronic expansion valve throttling at the inlet of the evaporator and the third electronic expansion valve throttling at the inlet of the evaporative condenser in series, realizes secondary throttling, thereby improving the heating performance and the energy efficiency ratio of the heat pump system, and solving the problem of low energy consumption ratio and serious range attenuation when the user heats at low temperature. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings constituting a part of this embodiment are used to provide further understanding of the embodiment, and the schematic embodiment and its description are used to explain the embodiment, and do not constitute improper limitation on the embodiment.

[0026] Figure 1 It is a structure schematic diagram of the new energy automobile thermal management system in the first embodiment of the application;

[0027] Figure 2 It is a working principle diagram of the passenger cabin refrigeration mode, the battery cooling mode and the electric control CDU / drive motor heat dissipation in the new energy automobile thermal management system in the first embodiment of the application;

[0028] Figure 3 It is a working principle diagram of the passenger cabin heating mode and the battery heating mode in the new energy automobile thermal management system in the first embodiment of the application;

[0029] Figure 4 It is a working principle diagram of the passenger cabin dehumidification mode in the new energy automobile thermal management system in the first embodiment of the application;

[0030] Figure 5 It is a refrigeration pressure-enthalpy diagram of the heat pump air conditioner refrigerant subsystem in the first embodiment of the application;

[0031] Figure 6 It is a heating pressure-enthalpy diagram of the heat pump air conditioner refrigerant subsystem in the first embodiment of the application;

[0032] Wherein, 1, compressor, 2, water-cooled condenser, 3, liquid storage dryer, 4, first three-way valve, 5, first electronic expansion valve, 6, battery cooler, 7, second electronic expansion valve, 8, blower, 9, evaporator, 10, second three-way valve, 11, check valve, 12, first coaxial tube, 13, second coaxial tube, 14, stop valve, 15, third electronic expansion valve, 16, evaporative condenser, 17, cooling fan, 18, first expansion water kettle, 19, first electronic water pump, 20, drive motor, 21, first three-way water valve, 22, low-temperature radiator, 23, second electronic water pump, 24, high-pressure water heater, 25, second three-way water valve, 26, warm air heater, 27, third electronic water pump, 28, third three-way water valve, 29, second expansion water kettle, 30, battery pack, 31, electric control CDU. DETAILED DESCRIPTION

[0033] The application will be further described below in conjunction with the drawings and embodiments.

[0034] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, 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.

[0035] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0036] In the case of no conflict, the embodiments in the application and the features in the embodiments can be combined with each other.

[0037] Embodiment one

[0038] The embodiment one of the application introduces a new energy automobile thermal management system.

[0039] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , a new energy automobile thermal management system comprises a heat pump air conditioning refrigerant subsystem and a cooling liquid circuit subsystem; the thermal management system operation modes are passenger cabin refrigeration mode, battery cooling mode, passenger cabin heating mode, battery heating mode and passenger cabin dehumidification mode.

[0040] The heat pump air conditioning refrigerant subsystem comprises a compressor 1, a water-cooled condenser 2, a liquid storage dryer 3, a first three-way valve 4, a battery cooler 6, a first electronic expansion valve 5, an evaporator 9, a second electronic expansion valve 7, a second three-way valve 10, a one-way valve 11, a first coaxial pipe 12, a second coaxial pipe 13, a stop valve 14, a third electronic expansion valve 15, an evaporative condenser 16, the third electronic expansion valve 15 and a blower 8.

[0041] Specifically, the inlet of the compressor 1 is connected to the low-pressure outlet of the first coaxial pipe 12 and the low-pressure outlet of the second coaxial pipe 13 respectively, the outlet of the compressor 1 is connected to the inlet of the water-cooled condenser 2 through a refrigerant pipeline, the outlet of the water-cooled condenser 2 is connected to the inlet of the liquid storage dryer 3 through a refrigerant pipeline, the outlet of the liquid storage dryer 3 is connected to the first three-way valve 4 through a refrigerant pipeline, the other interface of the first three-way valve 4 is connected to the high-pressure inlet of the first coaxial pipe 12 and the one-way valve 11 respectively, the high-pressure outlet of the first coaxial pipe 12 is connected to the inlet of the first electronic expansion valve 5 and the inlet of the second electronic expansion valve 7 respectively, the outlet of the first electronic expansion valve 5 is connected to the inlet of the battery cooler 6 through a refrigerant pipeline, the outlet of the battery cooler 6 is connected to the low-pressure section of the first coaxial pipe 12, the outlet of the second electronic expansion valve 7 is connected to the inlet of the evaporator 9 through a refrigerant pipeline, the outlet of the evaporator 9 is connected to the second three-way valve 10 through a refrigerant pipeline, the second three-way valve 10 is connected to the low-pressure inlet of the first coaxial pipe 12; the other interface of the second three-way valve 10 is connected to the medium-pressure end inlet of the second coaxial pipe 13, the medium-pressure end outlet of the second coaxial pipe 13 is connected to the inlet of the third electronic expansion valve 15 and the first three-way valve 4 respectively, the third electronic expansion valve 15 is connected to the inlet of the evaporative condenser 16 through a refrigerant pipeline, the outlet of the evaporative condenser 16 is connected to the inlet of the stop valve 14 and the inlet of the one-way valve 11 through a refrigerant pipeline, the outlet of the stop valve 14 is connected to the low-pressure end inlet of the second coaxial pipe 13, and the low-pressure end outlet of the second coaxial pipe 13 is connected to the low-pressure end outlet of the first coaxial pipe 12; the blower 8 is arranged on the air inlet side of the evaporator 9, and is used for accelerating the heat exchange rate of the evaporator and ventilating the passenger compartment.

[0042] The high-temperature and high-pressure gas refrigerant from the compressor outlet is condensed twice by the water-cooled condenser and the evaporative condenser to release the compressor power consumption, the passenger cabin heat load and the battery pack heat load when the heat pump air conditioning refrigerant subsystem executes the passenger cabin refrigeration mode and the battery cooling mode; the process of the heat pump air conditioning refrigerant subsystem executing the passenger cabin refrigeration mode and the battery cooling mode is as follows: the low-temperature and low-pressure gas refrigerant enters the first coaxial pipe 12 from the low-pressure end to become high-temperature and high-pressure gas refrigerant, the high-temperature and high-pressure gas refrigerant enters the water-cooled condenser 2 to become high-temperature and high-pressure liquid refrigerant, the high-temperature and high-pressure liquid refrigerant passes through the liquid storage dryer 3, the first three-way valve 4 and the third electronic expansion valve 15 in turn to enter the evaporative condenser 16 to become medium-temperature and high-pressure liquid refrigerant, the medium-temperature and high-pressure liquid refrigerant passes through the one-way valve 11 and the high-pressure end of the first coaxial pipe 12 and then throttles through the first electronic expansion valve 5 to become low-temperature and low-pressure gas-liquid two-phase mixture, the low-temperature and low-pressure gas-liquid two-phase mixture passes through the battery cooler 6 to become low-temperature and low-pressure gas refrigerant, the low-temperature and low-pressure gas refrigerant enters the low-pressure end of the first coaxial pipe 12, and the battery cooler 6 realizes the battery cooling effect by absorbing the heat of the battery circuit cooling liquid; the medium-temperature and high-pressure liquid refrigerant passes through the one-way valve 11 and the high-pressure end of the first coaxial pipe 12 and then throttles through the second electronic expansion valve 7 to become low-temperature and low-pressure gas-liquid two-phase mixture, the low-temperature and low-pressure gas-liquid two-phase mixture passes through the evaporator 9 to become low-temperature and low-pressure gas, the low-temperature and low-pressure gas refrigerant enters the low-pressure end of the first coaxial pipe 12, and the evaporator 9 realizes the passenger cabin refrigeration effect by absorbing heat, at this time, the first three-way valve 4 is in the closed state to the high-pressure end of the first coaxial pipe 12 and the shut-off valve 14, the second three-way valve 10 is in the closed state to the medium-pressure end of the second coaxial pipe 13, and the opening degree of the third electronic expansion valve 15 is the maximum opening.

[0043] The process of the heat pump air conditioning refrigerant subsystem executing the passenger cabin heating mode and the battery heating mode is as follows: low-temperature and low-pressure gas refrigerant enters the compressor 1 from the low-pressure end of the second coaxial pipe 13 to become high-temperature and high-pressure gas refrigerant, the high-temperature and high-pressure gas refrigerant enters the water-cooled condenser 2 to become high-temperature and high-pressure liquid refrigerant, the high-temperature and high-pressure liquid refrigerant passes through the liquid accumulator dryer 3, the first three-way valve 4 and the high-pressure end of the first coaxial pipe 12 to become high-temperature and high-pressure liquid refrigerant, the high-temperature and high-pressure liquid refrigerant is throttled by the second electronic expansion valve 7 to become high-temperature and medium-pressure liquid refrigerant, the high-temperature and medium-pressure liquid refrigerant enters the evaporator 9 to become medium-temperature and medium-pressure liquid refrigerant, the medium-temperature and medium-pressure liquid refrigerant passes through the medium-pressure end of the second coaxial pipe 13 to become low-temperature and low-pressure gas-liquid two-phase mixed refrigerant after being throttled by the third electronic expansion valve 15, the low-temperature and low-pressure gas-liquid two-phase mixed refrigerant becomes low-temperature and low-pressure gas refrigerant after passing through the evaporative condenser 16, the low-temperature and low-pressure gas refrigerant enters the low-pressure end of the second coaxial pipe 13 through the stop valve 14, and the combined heating effect is achieved by the heat release of the water-cooled condenser 2 for heating the cooling loop cooling liquid to indirectly release heat to the passenger cabin through the warm air heater and the heat release of the evaporator 9, and the battery heating function is realized by heating the cooling loop cooling liquid through the water-cooled condenser 2 and controlling the position of the first three-way water valve 21. At this time, the first three-way valve 4 is in a closed state to the medium-pressure end of the second coaxial pipe 13, the stop valve 14 is in an open state, and the second three-way valve 10 is in a closed state to the low-pressure end of the first coaxial pipe 12.

[0044] The process of the heat pump air conditioning refrigerant subsystem executing the passenger cabin dehumidification mode is as follows: low-temperature and low-pressure gas refrigerant enters the compressor 1 from the low-pressure end of the second coaxial pipe 13 to become high-temperature and high-pressure gas refrigerant, the high-temperature and high-pressure gas refrigerant enters the water-cooled condenser 2 to become high-temperature and high-pressure liquid refrigerant, the high-temperature and high-pressure liquid refrigerant passes through the liquid accumulator dryer 3, the first three-way valve 4, the high-pressure end of the first coaxial pipe 12 to become low-temperature and low-pressure gas-liquid two-phase refrigerant after being throttled by the second electronic expansion valve 7, the low-temperature and low-pressure gas-liquid two-phase refrigerant enters the evaporator 9 to become low-temperature and low-pressure gas refrigerant (containing a small amount of liquid refrigerant), the low-temperature and low-pressure gas refrigerant (containing a small amount of liquid refrigerant) passes through the medium-pressure end of the second coaxial pipe 13, the third electronic expansion valve 15 and the evaporative condenser 16 to become low-temperature and low-pressure gas refrigerant, and the low-temperature and low-pressure gas refrigerant enters the low-pressure end of the second coaxial pipe 13 through the stop valve 14. At this time, the first three-way valve 4 is in a closed state to the medium-pressure end of the second coaxial pipe 13, the stop valve 14 is in an open state, the second three-way valve 10 is in a closed state to the low-pressure end of the first coaxial pipe 12, and the third electronic expansion valve 15 is in a maximum opening state.

[0045] In the present embodiment, the refrigerant circuit passes through the water-cooled condenser 2 and the evaporative condenser 16 in series in the passenger cabin refrigeration mode and the battery cooling mode, realizes two-stage condensation, thereby improving the refrigeration performance and energy efficiency ratio of the heat pump system, and solving the problem of insufficient refrigeration capacity when the battery is fast-charged and the passenger cabin is refrigerated at the same time in high temperature.

[0046] In the present embodiment, the refrigerant circuit in the passenger cabin heating mode and the battery heating mode is connected in series through the second electronic expansion valve 7 throttling at the inlet of the evaporator 9 and the third electronic expansion valve 15 throttling at the inlet of the evaporator condenser 16, realizing secondary throttling, thereby improving the heating performance and energy efficiency ratio of the heat pump system, and solving the problems of low energy consumption ratio and serious endurance decay of the user when heating at low temperature.

[0047] On the basis of the heat pump air conditioning refrigerant subsystem, through the combination with the cooling liquid circuit subsystem, on the one hand, the heat of the water-cooled condenser of the refrigerant system in a high-temperature environment can be dissipated by means of the cooling liquid circuit subsystem, and on the other hand, the heat of the water-cooled condenser of the refrigerant system in a low-temperature environment can be used to heat the passenger cabin and the battery pack, and the waste heat in the cooling liquid circuit subsystem can be effectively utilized, thereby improving the overall energy efficiency of the thermal management system.

[0048] The cooling liquid circuit subsystem comprises: (1) an electric drive circuit: a first electronic water pump 19, an electric control CDU 31, a drive motor 20, a first three-way water valve 4, a low-temperature radiator 22, and a first expansion water kettle 18, which are sequentially connected by pipelines, wherein the outlet water pipe branch exhaust pipe of the low-temperature radiator 22 is communicated with the degassing port of the first expansion water kettle 18; (2) a water-cooled condenser circuit: a second electronic water pump 23, a water-cooled condenser 2, a second three-way water valve 25, and a warm air heater 26, which are sequentially connected by pipelines; and (3) a battery circuit: a third electronic water pump 27, a third three-way water valve 28, a battery cooler 6, a battery pack 30, and a second expansion water kettle 29, which are sequentially connected by pipelines.

[0049] In the present embodiment, the cooling liquid circuit subsystem further comprises a cooling fan 17, which is arranged on the exhaust side of the evaporative condenser 16, and is used to accelerate the heat exchange rate of the low-temperature radiator and the evaporative condenser.

[0050] The cooling liquid circuit subsystem realizes the passenger cabin cooling mode, the battery cooling mode, the passenger cabin heating mode, the battery heating mode, the passenger cabin dehumidification mode, and the electric control CDU / drive motor heat dissipation function by controlling the state of the second three-way water valve 25 and cooperating with the heat pump air conditioning refrigerant subsystem.

[0051] When the passenger cabin cooling mode, battery cooling mode, and electric control CDU / drive motor heat dissipation mode are selected, the port 1-2 of the first three-way water valve 21 is open, the port 1-3 of the second three-way water valve 25 is open, and the port 1-3 of the third three-way water valve 28 is open. The first electronic water pump 19, the second electronic water pump 23, and the third electronic water pump 27 are in the running state. The high-temperature and high-pressure gas refrigerant enters the water-cooled condenser 2 to become high-temperature and high-pressure liquid refrigerant, and the water-cooled condenser 2 circuit cooling liquid flows to take away the water-cooled condenser heat, and the heat is dissipated to the air through the low-temperature radiator 22, so as to finally realize the passenger cabin cooling mode. At the same time, the low-temperature and low-pressure gas-liquid two-phase mixture passes through the battery cooler, and then absorbs the battery circuit cooling liquid heat to realize the battery cooling mode. The electric control CDU / drive motor heat is taken away by the electric drive circuit cooling liquid flow, and finally dissipated through the low-temperature radiator.

[0052] When the passenger cabin heating mode and battery heating mode are selected, the port 2-3 of the first three-way water valve 21 is open, the ports 1-2-3 of the second three-way water valve 25 are all open, and the port 3-2 of the third three-way water valve 28 is open. The first electronic water pump 19, the second electronic water pump 23, and the third electronic water pump 27 are in the running state. The high-temperature and high-pressure gas refrigerant enters the water-cooled condenser 2 to become high-temperature and high-pressure liquid refrigerant, and then the water-cooled condenser 2 circuit cooling liquid flows to take away the water-cooled condenser heat, and the heat is exchanged through the warm air heater 26 to realize passenger cabin heating. At the same time, the water-cooled condenser 2 heat is sent to the battery pack 30 through the second three-way water valve 25 to realize battery heating. In addition, under extremely low temperature conditions, the heat of high-pressure water heating can be used for passenger cabin heating and battery heating.

[0053] When the passenger cabin dehumidification mode is selected, the port 1-2 of the first three-way water valve 21 is open, the port 1-2 of the second three-way water valve 25 is open, and the port 1-3 of the third three-way water valve 28 is open. The first electronic water pump 19, the second electronic water pump 23, and the third electronic water pump 27 are in the running state. The high-temperature and high-pressure gas refrigerant enters the water-cooled condenser 2 to become high-temperature and high-pressure liquid refrigerant, and then the water-cooled condenser 2 circuit cooling liquid flows to take away the water-cooled condenser heat, and the heat is exchanged through the warm air heater 26 to realize passenger cabin hot air flow. At the same time, the water-cooled condenser 2 heat is sent to the battery pack 30 through the second three-way water valve 25 to realize battery heating. At the same time, the low-temperature and low-pressure gas-liquid two-phase refrigerant enters the evaporator 9 to become low-temperature and low-pressure gas refrigerant to absorb the passenger cabin humid air, thereby realizing the passenger dehumidification mode.

[0054] The refrigeration performance improvement of the heat pump air conditioning refrigerant subsystem is illustrated by the R134a refrigerant pressure-enthalpy diagram, as shown in FIG. 6. Figure 5As shown: if only through the water-cooled condenser or evaporative condenser to achieve a condensation, refrigerant system for 1-2-3-4, passenger cabin evaporator enthalpy h1; through the water-cooled condenser and evaporative condenser refrigerant circuit in series, to achieve two-stage condensation, refrigerant system for 1-2'-3'-4', passenger cabin evaporator enthalpy h2; h2>h1, thus it can be seen that the two-stage condensing system in the embodiment, can greatly improve the refrigeration effect of air conditioning system, avoid the problem of poor heat dissipation effect of single condenser in the prior art, and improve the energy efficiency ratio, to a certain extent, improve the electric vehicle range.

[0055] The performance improvement of the heat pump air conditioning refrigerant subsystem is illustrated by R134a refrigerant pressure enthalpy diagram, as shown in Figure 6 As shown: if only through the water-cooled condenser or evaporative condenser to achieve a condensation, refrigerant system for 1-2-3-4, passenger cabin evaporator enthalpy h1; through the water-cooled condenser and evaporative condenser refrigerant circuit in series, to achieve two-stage condensation, refrigerant system for 1-2'-3'-4', passenger cabin evaporator enthalpy h2; h2>h1, thus it can be seen that the two-stage condensing system in the embodiment, can greatly improve the refrigeration effect of air conditioning system, avoid the problem of poor heat dissipation effect of single condenser in the prior art, and improve the energy efficiency ratio, to a certain extent, improve the electric vehicle range.

[0056] In the passenger cabin refrigeration mode and the battery cooling mode, the refrigerant circuit in the embodiment passes through the water-cooled condenser and the evaporative condenser in series to achieve two-stage condensation, thereby improving the heat pump system refrigeration performance and energy efficiency ratio, and solving the problem of insufficient refrigerating capacity when the battery fast charging and the passenger cabin refrigeration are simultaneously required at high temperature; in the passenger cabin heating mode and the battery heating mode, the refrigerant circuit passes through the second electronic expansion valve throttling at the evaporator inlet and the third electronic expansion valve throttling at the evaporative condenser inlet in series to achieve two-stage throttling, thereby improving the heat pump system heating performance and energy efficiency ratio, and solving the problem of low energy consumption ratio and serious range attenuation when the user heats at low temperature.

[0057] Embodiment two

[0058] The embodiment two of the present application introduces a car.

[0059] A car adopts the new energy vehicle thermal management system as introduced in embodiment one.

[0060] The detailed steps and the new energy vehicle thermal management system provided in embodiment one are the same, and will not be described here.

[0061] The above merely provides preferred embodiments of the present embodiment, but is not intended to limit the present embodiment. For those skilled in the art, the present embodiment can have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present embodiment shall fall into the scope of protection of the present embodiment.

Claims

1. A new energy vehicle thermal management system, characterized in that, The heat pump air conditioner refrigerant subsystem and the cooling liquid circuit subsystem are included; The heat pump air conditioner refrigerant subsystem includes a compressor, a water-cooled condenser, a first three-way valve, a first electronic expansion valve, an evaporator, a second electronic expansion valve, a second three-way valve, a check valve, a stop valve, an evaporative condenser and a third electronic expansion valve; The cooling liquid circuit subsystem includes a water-cooled condenser circuit sequentially connected by a second electronic water pump, the water-cooled condenser, a second three-way water valve and a warm air heater. The compressor is connected to the water-cooled condenser, the outlet of the first electronic expansion valve is connected to the inlet of a battery cooler, the outlet of the second electronic expansion valve is connected to the inlet of the evaporator, the outlet of the evaporator is connected to the second three-way valve, the third electronic expansion valve is connected to the inlet of the evaporative condenser, and the outlet of the evaporative condenser is connected to the inlet of the stop valve and the inlet of the check valve. The heat pump air conditioner refrigerant subsystem cooperates with the cooling liquid circuit subsystem by controlling the switching states of the first three-way valve, the second three-way valve and the stop valve, and by controlling the switching state of the second three-way water valve, to realize passenger cabin refrigeration mode, battery cooling mode, passenger cabin heating mode, battery heating mode and passenger cabin dehumidification mode. When the heat pump air conditioner refrigerant subsystem executes the passenger cabin refrigeration mode and the battery cooling mode, high-temperature and high-pressure gas refrigerant at the outlet of the compressor is condensed by the water-cooled condenser and the evaporative condenser in series to release the power consumption of the compressor, the heat load of the passenger cabin and the heat load of the battery pack. When the heat pump air conditioner refrigerant subsystem executes the passenger cabin heating mode and the battery heating mode, the second electronic expansion valve at the inlet of the evaporator and the third electronic expansion valve at the inlet of the evaporative condenser are connected in series to realize secondary throttling.

2. A new energy vehicle thermal management system as claimed in claim 1, characterized in that, The heat pump air conditioner refrigerant subsystem further includes a liquid storage dryer, a battery cooler, a first coaxial pipe and a second coaxial pipe. The inlet of the compressor is connected to the low-pressure outlet of the first coaxial pipe and the low-pressure outlet of the second coaxial pipe, the outlet of the compressor is connected to the inlet of the water-cooled condenser through a refrigerant pipeline, the outlet of the water-cooled condenser is connected to the inlet of the liquid storage dryer through a refrigerant pipeline, the outlet of the liquid storage dryer is connected to the first three-way valve through a refrigerant pipeline, and the other interface of the first three-way valve is connected to the check valve and the high-pressure inlet of the first coaxial pipe, and the high-pressure outlet of the first coaxial pipe is connected to the inlet of the first electronic expansion valve and the inlet of the second electronic expansion valve.

3. The new energy vehicle thermal management system according to claim 2, characterized in that, The first electronic expansion valve outlet is connected to the battery cooler inlet through a refrigerant pipeline, the battery cooler outlet is connected to the first coaxial pipe low-pressure section, the second electronic expansion valve outlet is connected to the evaporator inlet through a refrigerant pipeline, the evaporator outlet is connected to the second three-way valve through a refrigerant pipeline, and the second three-way valve is connected to the first coaxial pipe low-pressure inlet; another interface of the second three-way valve is connected to the second coaxial pipe medium-pressure end inlet, the second coaxial pipe medium-pressure end outlet is respectively connected to the third electronic expansion valve inlet and the first three-way valve, the third electronic expansion valve is connected to the evaporative condenser inlet through a refrigerant pipeline, the evaporative condenser outlet is respectively connected to the stop valve inlet and the one-way valve inlet through a refrigerant pipeline, the stop valve outlet is connected to the second coaxial pipe low-pressure end inlet, and the second coaxial pipe low-pressure end outlet is connected to the first coaxial pipe low-pressure end outlet.

4. The new energy vehicle thermal management system according to claim 1, characterized in that, The heat pump air conditioner refrigerant subsystem further comprises a blower arranged on the air inlet side of the evaporator, which is used to accelerate the heat exchange rate of the evaporator and the ventilation of the passenger cabin.

5. A new energy vehicle thermal management system as claimed in claim 1, characterized in that, The cooling liquid circuit subsystem further comprises an electric drive circuit, which comprises a first electronic water pump, an electric control CDU, a drive motor, a first three-way water valve, a low-temperature radiator and a first expansion water pot connected in sequence, wherein the radiator outlet water pipe branch exhaust pipe is connected to the degassing port of the first expansion water pot.

6. A new energy vehicle thermal management system as claimed in claim 1, characterized in that, The cooling liquid circuit subsystem further comprises a battery circuit, which comprises a third electronic water pump, a third three-way water valve, a battery cooler, a battery pack and a second expansion water pot connected in sequence.

7. A new energy vehicle thermal management system as claimed in claim 1, characterized in that, The cooling liquid circuit subsystem further comprises a cooling fan arranged on the air exhaust side of the evaporative condenser, which is used to accelerate the heat exchange rate of the low-temperature radiator and the evaporative condenser.

8. An automobile characterized by comprising: The new energy vehicle thermal management system as claimed in any one of claims 1-7 is adopted.

Images