A new energy vehicle integrated thermal management system based on heat pump air conditioner

Abstract

The application discloses a new energy vehicle integrated heat management system based on a heat pump air conditioner and relates to the technical field of automobile air conditioner systems.The technical scheme is as follows: on the basis of an existing whole vehicle air conditioner system, a heat pump air conditioner system is taken as the basis, a battery, a motor and a controller thereof, and a passenger cabin heat management system are integrated, a scheme in which air heating PTC is used as auxiliary and the heat pump air conditioner is used as main is adopted, the heat pump air conditioner cooperates with the air heating PTC to solve the problem of low efficiency of the heat pump air conditioner at low temperature, and a three-way regulating valve is connected with a water cooling condenser branch and a water heating PTC branch, thereby serving as a bridge for motor and battery waste heat recovery, waste heat is provided to an air conditioner loop, and the heat pump system energy consumption is further reduced; in addition, when the cooling liquid temperature is too high, a part of heat can be dissipated through a radiator through the three-way regulating valve, a four-way valve is adopted to complete switching of the flow direction of refrigerant, and the integration degree is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile air conditioning systems, and more particularly to a new energy vehicle integrated thermal management system based on a heat pump air conditioner. BACKGROUND

[0002] The thermal management of today's pure electric vehicles can be divided into air conditioning cycle thermal management, battery cycle thermal management, motor and controller cycle thermal management, and these three parts are the core of the vehicle thermal management. The purpose of thermal management is to transfer heat according to the cold and heat load of each core component to meet the temperature requirements of each component. The air conditioning system thermal management mainly meets the cooling and heating needs of the passengers in the passenger compartment, and also has the functions of wind defrosting, defogging and dehumidification of the driver's cabin. Among them, the refrigeration function of the passenger compartment is very mature, and the optimization of energy saving effect is small. Low-temperature heating generally uses water heating PTC or air heating PTC heating, which has low efficiency and high energy consumption, and can account for about 35% of the vehicle energy consumption, resulting in a reduction of 20-30% in the range. Therefore, the heat pump air conditioning scheme is adopted to reduce energy consumption.

[0003] However, the low-temperature efficiency of the heat pump air conditioner is low, and the defrosting of the outdoor heat exchanger is a serious problem, which still restricts the development of the heat pump air conditioner and needs further research. SUMMARY

[0004] The purpose of the present application is to provide a new energy vehicle integrated thermal management system based on a heat pump air conditioner, which takes the heat pump air conditioning system as the core, considers battery driving and charging cooling, motor cooling and waste heat recovery, integrates the functions of the thermal management system components and pipeline connections under the premise of system function integration, improves the integration of the vehicle thermal management system, and has the characteristics of simple structure, high system efficiency, low energy consumption and high vehicle matching.

[0005] The above technical purpose of the present application is realized by the following technical scheme: a new energy vehicle integrated thermal management system based on a heat pump air conditioner, the system comprising a driver's cabin refrigeration and heating module, a battery refrigeration and heating module, and a motor cooling and motor waste heat recovery module.

[0006] By adopting the above technical scheme, the driver's cabin refrigeration and heating module is used for refrigeration and heating of the driver's cabin, which is similar to a household air conditioner. The refrigeration and heating functions are switched by the flow direction of the refrigerant. For example, when refrigeration is working, the internal refrigerant first flows through the outdoor heat exchanger to release heat, and then flows through the indoor heat exchanger to absorb heat, that is, the refrigerant flows clockwise. When heating is working, the internal refrigerant first flows through the indoor heat exchanger to release heat, and then flows through the outdoor heat exchanger to absorb heat, that is, the refrigerant flows counterclockwise.

[0007] The battery refrigeration and heating module needs to work with the cab refrigeration and heating module, and the chiller can achieve the same function as the indoor radiator, that is, when the air conditioner part refrigerant flows clockwise, the chiller cools the battery circuit by heat absorption; on the contrary, when the refrigerant flows counterclockwise, the chiller heats the battery circuit by heat release.

[0008] The motor cooling and motor waste heat recycling module is connected with the battery circuit through the cooling liquid four-way valve when the motor needs to be cooled. When the motor waste heat is recycled, the cooling liquid flows into the water-cooled condenser (LCC) through the cooling liquid three-way valve, and then the air conditioning circuit absorbs heat in the LCC.

[0009] The cab refrigeration and heating module further comprises an indoor heat exchanger, an outdoor heat exchanger, a water-cooled condenser, a compressor and a gas-liquid separator, the indoor heat exchanger is connected in parallel with an HVAC and an A-PTC, one end of the indoor heat exchanger is connected in series with a refrigerant electromagnetic valve two and an electronic expansion valve two, the refrigerant electromagnetic valve two and the electronic expansion valve two are connected in parallel with each other, the other end of the indoor heat exchanger is connected in series with a refrigerant four-way valve, the 1 channel of the refrigerant four-way valve is connected with the water-cooled condenser, the 3 channel of the refrigerant four-way valve is connected with the indoor heat exchanger, the 4 channel of the refrigerant four-way valve is connected with the gas-liquid separator, the 2 channel of the refrigerant four-way valve is connected with the compressor, the compressor and the gas-liquid separator are connected in series so that the 2 channel and the 4 channel of the refrigerant four-way valve are communicated; the water-cooled condenser and the outdoor heat exchanger are connected in series, the outdoor heat exchanger is provided with a fan in parallel, the other end of the outdoor heat exchanger is connected in series with a refrigerant electromagnetic valve one and an electronic expansion valve one, the refrigerant electromagnetic valve one and the electronic expansion valve one are connected in parallel with each other, a pressure temperature sensor two is arranged between the indoor heat exchanger and the refrigerant four-way valve, and a pressure temperature sensor one is arranged between the refrigerant electromagnetic valve one and the electronic expansion valve one which are connected in parallel and the refrigerant electromagnetic valve two and the electronic expansion valve two which are connected in parallel.

[0010] The battery refrigeration and heating module further comprises a chiller, an electronic water pump two, a liquid cooling plate and a battery pack, two ends of the chiller are respectively provided with a temperature sensor, one end of the chiller is connected with a cooling liquid four-way valve, the other end of the chiller is connected with the liquid cooling plate, the liquid cooling plate is connected in parallel with the battery pack, the other end of the liquid cooling plate is connected with the electronic water pump two, an expansion tank two is arranged between the electronic water pump two and the liquid cooling plate, the 1 channel of the cooling liquid four-way valve is connected with the chiller, and the 4 channel of the cooling liquid four-way valve is connected with the electronic water pump two.

[0011] The motor cooling and motor waste heat recycling module further comprises a radiator, an electronic water pump one, a W-PTC, an expansion water tank one and a motor, one end of the radiator is connected with a cooling liquid three-way valve, the other end of the radiator is connected with the motor, a 1 channel of the cooling liquid three-way valve is connected with the radiator, a 2 channel of the cooling liquid three-way valve is connected with the electronic water pump one, a 3 channel of the cooling liquid three-way valve is connected with a water-cooled condenser, the electronic water pump one is connected with the W-PTC, the W-PTC is connected with the expansion water tank one, the expansion water tank one is connected with a 3 channel of a cooling liquid four-way valve, and a 2 channel of the cooling liquid four-way valve is connected with the motor.

[0012] The refrigeration device is connected with a refrigerant electromagnetic valve three and an electronic expansion valve three, the refrigerant electromagnetic valve three and the electronic expansion valve three are connected in parallel with each other, the refrigerant electromagnetic valve three and the electronic expansion valve three connected in parallel with each other are connected with the refrigerant electromagnetic valve two and the electronic expansion valve two connected in parallel with each other, and the refrigeration device is connected with a pressure temperature sensor three.

[0013] In the technical scheme, the functions of the key components are as follows:

[0014] The electronic water pump one realizes circulation of the battery pack loop cooling liquid.

[0015] The electronic water pump two realizes circulation of the motor loop cooling liquid.

[0016] The refrigeration device (Chiller) realizes heat exchange between the refrigerant and the battery pack cooling liquid, the refrigerant is expanded and gasified to absorb heat in the refrigeration device, and the battery pack cooling liquid is cooled.

[0017] The temperature sensor one (T1) and the temperature sensor two (T2) measure the inlet and outlet temperatures of the battery pack cooling liquid, and are used for calculating the battery refrigeration / heating power.

[0018] The pressure temperature sensor one (PT1) measures the refrigerant temperature and pressure, and is used for calculating the supercooling degree of the refrigerant and adjusting the fan rotating speed through the pressure.

[0019] The pressure temperature sensor two (PT2) measures the refrigerant pressure and temperature, and is used for calculating the superheating degree of the refrigerant.

[0020] The pressure temperature sensor three (PT3) measures the refrigerant pressure and temperature, and is used for calculating the superheating degree of the refrigerant.

[0021] The electronic expansion valve one (EXV1) realizes control of the refrigeration device refrigerant flow through opening degree adjustment, and adjusts the battery cooling power.

[0022] Electronic expansion valve two (EXV2): through the opening degree adjustment, the control of the refrigerant flow of the refrigeration device is realized, and the battery cooling power is adjusted;

[0023] Electronic expansion valve three (EXV3): through the opening degree adjustment, the control of the refrigerant flow of the refrigeration device is realized, and the battery cooling power is adjusted;

[0024] Refrigerant solenoid valve one (SOV1) and refrigerant solenoid valve two (SOV2): used for opening when the cab refrigeration and heating demand, closing the refrigeration in the air conditioning system;

[0025] Refrigerant solenoid valve three (SOV3): used for opening when the battery cooling demand is off, closing the refrigeration into the chiller in the air conditioning system;

[0026] Indoor heat exchanger: when refrigeration, the refrigerant expands and vaporizes in the indoor heat exchanger to absorb heat, realizing the cooling of the cabin intake air, and when heating, the refrigerant condenses and liquefies in the indoor heat exchanger to release heat, realizing the heating of the low cab intake air;

[0027] Outdoor heat exchanger: when refrigeration, the high-temperature and high-pressure gaseous refrigerant is condensed into medium-temperature and high-pressure liquid refrigerant, and when heating, the low-temperature and low-pressure liquid refrigerant is evaporated into low-temperature and low-pressure gas refrigerant;

[0028] Fan: through forced air flow, the surface of the outdoor heat exchanger and the front end radiator is realized, realizing the cooling of the refrigerant and the cooling liquid;

[0029] Compressor: the low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure gaseous refrigerant;

[0030] Heating, ventilation and air conditioning (HVAC): including a warm air tank and a blower, the cooling liquid reaches the warm air tank, and exchanges heat with the air blown by the blower through heat radiation and convection, the blower realizes forced air flow, so that the air passes through the surface of the warm air tank and enters the cab to realize heating;

[0031] W-PTC: through the PTC thermistor as the heating source, the cooling liquid is heated;

[0032] A-PTC: through the PTC thermistor as the heating source, the air at the air outlet is heated;

[0033] Cooling liquid three-way valve: by changing the connection mode of the valve door, the switching of the drive motor heat dissipation and motor waste heat recovery function is realized;

[0034] Refrigerant four-way valve: through the four-way valve to switch the refrigerant flow direction, so as to switch the refrigeration mode;

[0035] Cooling liquid four-way valve: through the four-way valve to connect or parallel the battery circuit with the motor and its controller circuit, realizing the switching of the motor waste heat recovery and heat dissipation function;

[0036] Gas-liquid separator: absorb liquid in refrigerant, prevent liquid into compressor;

[0037] Expansion tank one and expansion tank two: supplement cooling liquid in front radiator and heater core.

[0038] In summary, the present application has the following beneficial effects: the present application develops an integrated thermal management system taking heat pump air conditioning system as core, giving consideration to battery driving and charging cooling, motor cooling and waste heat recovery, integrates function components and pipeline connection of the thermal management system under the premise of system function integration, improves the integration degree of the vehicle thermal management system, and has the characteristics of simple structure, high system efficiency, low energy consumption and high vehicle model matching. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is an integrated thermal management structure schematic diagram in the embodiment of the present application;

[0040] Figure 2 is each subsystem independent refrigeration mode and mutual coupling refrigeration mode (driver's cabin independent cooling mode) in the embodiment of the present application;

[0041] Figure 3 is each subsystem independent refrigeration mode and mutual coupling refrigeration mode (battery pack independent cooling) in the embodiment of the present application;

[0042] Figure 4 is each subsystem independent refrigeration mode and mutual coupling refrigeration mode (driver's cabin, battery pack and motor cooling simultaneously) in the embodiment of the present application;

[0043] Figure 5 is single driver's cabin independent heating mode [single driver's cabin heating (heat pump)] in the embodiment of the present application;

[0044] Figure 6 is single driver's cabin independent heating mode [single driver's cabin heating (heat pump plus waste heat recovery)] in the embodiment of the present application;

[0045] Figure 7 is single driver's cabin independent heating mode [single driver's cabin heating (waste heat recovery)] in the embodiment of the present application;

[0046] Figure 8 is single driver's cabin independent heating mode [single driver's cabin heating (PTC)] in the embodiment of the present application;

[0047] Figure 9 is single battery independent heating mode [battery pack independent heating (heat pump)] in the embodiment of the present application;

[0048] Figure 10is the single cell independent heating mode [battery pack alone heating (waste heat recovery 1)] in the embodiment of the application;

[0049] Figure 11 is the single cell independent heating mode [battery pack alone heating (waste heat recovery 2)] in the embodiment of the application;

[0050] Figure 12 is the single cell independent heating mode [battery pack alone heating (waste heat recovery 2)] in the embodiment of the application;

[0051] Figure 13 is the single cell independent heating mode [battery pack alone heating (waste heat recovery 2)] in the embodiment of the application;

[0052] Figure 14 is the single cell independent heating mode [battery pack alone heating (waste heat recovery 2)] in the embodiment of the application;

[0053] Figure 15 is the single cell independent heating mode [battery pack alone heating (waste heat recovery 2)] in the embodiment of the application;

[0054] Figure 16 is the single cell independent heating mode [battery pack alone heating (waste heat recovery 2)] in the embodiment of the application;

[0055] Figure 17 is the single cell independent heating mode [battery pack alone heating (waste heat recovery 2)] in the embodiment of the application. DETAILED DESCRIPTION

[0056] The following will be described in detail with reference to the accompanying drawings. Figures 1-17 The application will be further described in detail.

[0057] Considering the cabin cooling / heating, battery pack cooling / heating, and motor cooling only, there are different coupling modes under different cooling / heating requirements of each subsystem, for example: the cabin, battery, and motor all need cooling, each subsystem exchanges heat through the coupled heat exchanger, and the specific working mode is shown in embodiments 1-5:

[0058] Embodiment 1: independent cooling mode and mutual coupling cooling mode of each subsystem

[0059] Cabin independent cooling: the cabin has cooling demand, the battery has no cooling demand, the high-temperature and high-pressure refrigerant is cooled through the outdoor heat exchanger, and then becomes low-temperature and low-pressure state through the electronic expansion valve, and absorbs heat from the indoor evaporator to realize the cooling function.

[0060] Battery pack independent cooling: the cab has no refrigeration requirement, the battery has refrigeration requirement, high temperature and high pressure refrigerant releases heat through outdoor heat exchanger, then becomes low temperature and low pressure state through electronic expansion valve, low temperature refrigerant absorbs heat of battery cooling liquid in Chiller to cool battery cooling liquid, and then the cooling liquid cools the battery.

[0061] Cab, battery pack and motor simultaneous cooling: the cab, battery and motor all have refrigeration requirement, the opening degree of two electronic expansion valves of chiller branch and indoor evaporator branch is adjusted to control the flow distribution of refrigerant in the branch, and motor cooling liquid exchanges heat through the front radiator to cool the motor, thereby realizing simultaneous refrigeration of the cab and the battery pack.

[0062] The control process of example 1 is as follows:

[0063] Cab independent cooling: the refrigerant four-way valve is connected at 1-2 and 3-4, electronic expansion valve 2 and electromagnetic valve 1 are simultaneously opened, the compressor is started, and the electronic fan works.

[0064] Battery pack independent cooling: the refrigerant four-way valve is connected at 1-2 and 3-4, water pump 2 is opened, electronic expansion valve 3 and electromagnetic valve 1 are simultaneously opened, the compressor is started, and the electronic fan works.

[0065] Cab, battery pack and motor simultaneous cooling: the refrigerant four-way valve is connected at 1-2 and 3-4, the cooling liquid four-way valve is connected at 1-3 and 2-4, water pumps 1 and 2 are opened, electromagnetic valve 1 is opened, electronic expansion valves 2 and 3 are opened, the compressor is started, and the electronic fan is opened.

[0066] Example 2: single cab independent heating mode

[0067] Single cab heating (heat pump): the cab has heating requirement, the battery has no refrigeration and heating requirement, and when the motor temperature is too low, the refrigerant four-way valve is controlled to make high temperature refrigerant flow to the indoor heat exchanger to heat the cab, and then absorb heat from the environment through the outdoor heat exchanger; the heat source is the environment + compressor.

[0068] Single cab heating (heat pump plus waste heat recovery): the cab has heating requirement, the battery has no refrigeration and heating requirement, and when the motor temperature is moderate, the three-way valve controls the flow direction of the cooling liquid, the water-cooled condenser is opened, the fan is opened, the refrigerant first obtains heat from the environment through the outdoor heat exchanger, and then obtains motor waste heat from the cooling liquid through LLC; the heat source is the environment + motor + compressor.

[0069] Single cab heating (waste heat recovery): the cab has heating requirement, the battery has no refrigeration and heating requirement, and when the motor temperature is high, the three-way valve controls the flow direction of the cooling liquid, the water-cooled condenser is opened, the fan is closed, and the refrigerant obtains motor waste heat from the LLC to heat the cab; the heat source is the motor + compressor.

[0070] Single cab heating (PTC): The cab has heating demand, the battery has no refrigeration and heating demand, the ambient temperature is too low, the heat pump efficiency is too low, the heat pump air conditioner is closed, and only A-PTC heating is relied on. The heat source is an electric heater.

[0071] The control flow of example 2 is as follows:

[0072] Single cab heating (heat pump): The refrigerant four-way valve 1-4 is connected, 2-3 is connected → the electromagnetic valve 2 is opened → the electronic expansion valve 1 works → the compressor works → the electronic fan works.

[0073] Single cab heating (heat pump plus waste heat recovery): The refrigerant four-way valve 1-4 is connected, 2-3 is connected → the three-way valve 2-3 is connected → the electromagnetic valve 2 is opened → the electronic expansion valve 1 works → the water pump 1, 2 works → the compressor works.

[0074] Single cab heating (waste heat recovery): The refrigerant four-way valve 1-4 is connected, 2-3 is connected → the three-way valve 2-3 is connected → the electromagnetic valve 2 is opened → the electronic expansion valve 1 works → the water pump 1 works → the compressor works → the electronic fan works.

[0075] Single cab heating (PTC): The refrigerant four-way valve 1-4 is connected, 2-3 is connected → the three-way valve 2-3 is connected → the PTC heater power is adjusted.

[0076] Example 3: Single battery independent heating mode

[0077] Battery pack alone heating (heat pump): The ambient temperature is sufficient, the motor temperature is too low, the cab has no refrigeration and heating demand, the battery pack has heating demand, the refrigerant four-way valve is controlled, the high-temperature refrigerant first flows to the Chiller to heat the battery cooling liquid, and then absorbs heat from the environment through the outdoor heat exchanger; The heat source is the environment + compressor.

[0078] Battery pack alone heating (waste heat recovery 1): The ambient temperature is sufficient, the motor temperature is sufficient, the cab has no refrigeration and heating demand, the battery pack has heating demand, the compressor is not started, the motor and the battery cooling liquid circuit are connected, and the heat balance between the motor and the battery is balanced through the cooling liquid; The heat source is the motor.

[0079] Battery pack alone heating (waste heat recovery 2): The ambient temperature is sufficient, the motor temperature is insufficient, the cab has no refrigeration and heating demand, the battery pack has heating demand, the compressor is started, the motor heat and the compressor heat are released to the refrigerant through the LLC, and the cooling liquid is heated in the Chiller to heat the battery, and the heat source is the motor + compressor.

[0080] Battery heating alone (heat pump plus waste heat recovery): Ambient temperature is enough, motor temperature is enough, cab has no refrigeration and heating demand, battery has heating demand, on the basis of waste heat recovery 2, open fan, refrigerant first absorbs heat from the environment through the outdoor heat exchanger, and then absorbs in LLC; Heat source is environment + motor + compressor.

[0081] The control flow of example 3 is as follows:

[0082] Battery heating alone (heat pump): refrigerant four-way valve 1-4 communication, 2-3 communication → cooling liquid four-way valve 1-4 communication, 2-3 communication → electromagnetic valve 3 open → electronic expansion valve 1 work → water pump 2 work → compressor work → electronic fan work.

[0083] Battery heating alone (waste heat recovery 1): cooling liquid four-way valve 1-2 communication, 3-4 communication → three-way valve 2-3 communication → water pump 1, 2 work.

[0084] Battery heating alone (waste heat recovery 2): refrigerant four-way valve 1-4 communication, 2-3 communication → cooling liquid four-way valve 1-2 communication, 3-4 communication → three-way valve 2-3 communication → electromagnetic valve 3 open → electronic expansion valve 1 work → water pump 1, 2 work → compressor work.

[0085] Battery heating alone (heat pump plus waste heat recovery): refrigerant four-way valve 1-4 communication, 2-3 communication → cooling liquid four-way valve 1-2 communication, 3-4 communication → three-way valve 2-3 communication → electromagnetic valve 3 open → electronic expansion valve 1 work → water pump 1, 2 work → compressor work → electronic fan work.

[0086] Example 4: each system is coupled to each other mode:

[0087] Cab heating (heat pump) plus battery cooling: cab has heating demand, battery has refrigeration demand, three-way valve and four-way valve control cooling liquid flow direction, open water-cooled condenser, refrigerant first absorbs heat from the environment from the outdoor heat exchanger, then gets battery waste heat from the cooling liquid to heat the cab; Heat source is battery + environment + compressor.

[0088] Cab & battery heating (heat pump): cab has heating demand, battery has heating demand, ambient temperature is high enough, motor temperature is too low, four-way valve controls refrigerant flow direction, only through the outdoor heat exchanger to absorb heat from the environment, while supplying heating to the cab and battery; Heat source is environment + compressor.

[0089] Cab & battery heating (waste heat recovery): cab has heating demand, battery has heating demand, ambient temperature is high enough, motor temperature is enough, control cooling liquid valve, connect motor and battery cooling liquid circuit, release motor heat and compressor heat to refrigerant through LLC, then supply heating to cab and battery at the same time, heat source is motor + compressor.

[0090] Heating for cab & battery (heat pump + waste heat recovery): The cab has a heating demand, the battery has a heating demand, the ambient temperature is high enough, and the motor temperature is insufficient. On the basis of the previous mode, the fan is turned on, and the refrigerant first absorbs heat from the environment through the outdoor heat exchanger and then absorbs it in the LLC; the heat source is the environment + motor + compressor.

[0091] The control flow of Example 4 is as follows:

[0092] Heating for cab (heat pump) + battery cooling: Refrigerant four-way valve 1-4 communication, 2-3 communication → cooling liquid four-way valve 1-2 communication, 3-4 communication → three-way valve 2-3 communication → electromagnetic valve 2 open → electronic expansion valve 1 work → water pump 1, 2 work → compressor work → electronic fan work.

[0093] Heating for cab & battery (heat pump): Refrigerant four-way valve 1-4 communication, 2-3 communication → cooling liquid four-way valve 1-4 communication, 2-3 communication → electromagnetic valves 2, 3 open → electronic expansion valve 1 work → water pump 2 work → compressor work → electronic fan work.

[0094] Heating for cab & battery (waste heat recovery): Refrigerant four-way valve 1-4 communication, 2-3 communication → cooling liquid four-way valve 1-2 communication, 3-4 communication → three-way valve 2-3 communication → electromagnetic valves 2, 3 open → electronic expansion valve 1 work → water pump 1, 2 work → compressor work.

[0095] Heating for cab & battery (heat pump + waste heat recovery): Refrigerant four-way valve 1-4 communication, 2-3 communication → cooling liquid four-way valve 1-2 communication, 3-4 communication → three-way valve 2-3 communication → electromagnetic valves 2, 3 open → electronic expansion valve 1 work → water pump 1, 2 work → compressor work → electronic fan work.

[0096] Example 5: Special working mode

[0097] Defrosting for outdoor heat exchanger: The cab or battery has a heating demand, the outdoor heat exchanger is frosted, the outdoor heat exchanger surface is frosted, the refrigerant four-way valve flow direction is changed, the refrigeration mode is converted, the fan is closed, and defrosting is realized by using high-temperature refrigerant; to avoid large temperature fluctuations of the cab and the cooling liquid, A-PTC and W-PTC can be considered to be turned on.

[0098] The control flow of Example 5 is as follows:

[0099] Defrosting for outdoor heat exchanger: Refrigerant four-way valve 1-2 communication, 3-4 communication → cooling liquid four-way valve 1-2 communication, 3-4 communication → three-way valve 1-2 communication → electromagnetic valve 1 open → electronic expansion valves 2, 3 work → A-PTC, W-PTC open → compressor work.

[0100] The embodiments are only used to explain the present application, and are not used to limit the present application, and any modification without creative contribution made by the person skilled in the art according to the embodiments after reading the specification is protected by the patent law as long as it is within the scope of the claims of the present application.

Claims

1. An integrated thermal management system for new energy vehicles based on heat pump air conditioning, characterized by: The system includes a cab cooling and heating module, a battery cooling and heating module, and a motor cooling and motor waste heat recovery module. The cab cooling and heating module includes an indoor heat exchanger, an outdoor heat exchanger, a water-cooled condenser, a compressor, and a gas-liquid separator. The indoor heat exchanger is connected in parallel with an HVAC system and an A-PTC system. One end of the indoor heat exchanger is connected in series with a second refrigerant solenoid valve and a second electronic expansion valve, which are connected in parallel. The other end of the indoor heat exchanger is connected in series with a refrigerant four-way valve. Channel 1 of the refrigerant four-way valve is connected to the water-cooled condenser, channel 3 is connected to the indoor heat exchanger, and channel 4 is connected to the gas-liquid separator. Channel 2 of the refrigerant four-way valve... The compressor is connected to the channel, and the compressor is connected in series with the gas-liquid separator so that the 2nd and 4th channels of the refrigerant four-way valve are connected; the water-cooled condenser is connected in series with the outdoor heat exchanger, and the outdoor heat exchanger is equipped with a fan in parallel. The other end of the outdoor heat exchanger is connected in series with a refrigerant solenoid valve and an electronic expansion valve. The refrigerant solenoid valve and the electronic expansion valve are connected in parallel. A pressure and temperature sensor is provided between the indoor heat exchanger and the refrigerant four-way valve. A pressure and temperature sensor is provided between the refrigerant solenoid valve and the electronic expansion valve connected in parallel and between the refrigerant solenoid valve and the electronic expansion valve connected in parallel. The motor cooling and waste heat recovery module includes a radiator, an electronic water pump, a W-PTC, an expansion tank, and a motor. One end of the radiator is connected to a three-way coolant valve, and the other end is connected to the motor. Channel 1 of the three-way coolant valve is connected to the radiator, channel 2 is connected to the electronic water pump, channel 3 is connected to a water-cooled condenser, the electronic water pump is connected to the W-PTC, the W-PTC is connected to the expansion tank, the expansion tank is connected to channel 3 of a four-way coolant valve, and channel 2 of the four-way coolant valve is connected to the motor.

2. The integrated thermal management system for new energy vehicles based on heat pump air conditioning according to claim 1, characterized in that: The battery cooling and heating module includes a cooling device, an electronic water pump II, a liquid cooling plate, and a battery pack. A temperature sensor is installed at each end of the cooling device. One end of the cooling device is connected to a four-way coolant valve, and the other end is connected to the liquid cooling plate, which is connected in parallel with the battery pack. The other end of the liquid cooling plate is connected to the electronic water pump II. An expansion tank II is located between the electronic water pump II and the liquid cooling plate. One channel of the four-way coolant valve is connected to the cooling device, and the fourth channel of the four-way coolant valve is connected to the electronic water pump II.

3. The integrated thermal management system for new energy vehicles based on heat pump air conditioning according to claim 2, characterized in that: The refrigeration unit is connected to a refrigerant solenoid valve three and an electronic expansion valve three, which are connected in parallel. The refrigerant solenoid valve three and the electronic expansion valve three are connected in parallel to the refrigerant solenoid valve two and the electronic expansion valve two, which are also connected in parallel. The refrigeration unit is also connected to a pressure and temperature sensor three, which is connected to the cab refrigeration and heating module.

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