Heat pump air conditioning system for electric automobile and working method

Abstract

The invention discloses a heat pump air-conditioning system for an electric automobile and a working method, the system and the working method are reasonable in design, parts of a refrigerant loop are all integrated in a heat management integrated module, an air-conditioning pipeline in the traditional sense is canceled, the charge amount of R290 refrigerant is reduced, and the system safety is guaranteed; the whole cooling liquid system only uses one radiator, and only uses one eight-way valve, one three-way valve and one cooler to realize cooling and heating of the battery, so that the number of parts is reduced as much as possible, more functions are realized by using fewer parts, the cost can be reduced, and the system is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile thermal management, and in particular to a heat pump air conditioning system for electric vehicles and a working method thereof. Background Art

[0002] The refrigerant R744, which is currently being studied the most, has a GWP (global warming potential) of 1 and is a completely environmentally friendly natural working fluid. However, the R744 system has very high pressure, poor cooling effect under high temperature conditions, and is incompatible with the existing air-conditioning system structure. It needs to be redesigned and developed, which is costly.

[0003] R290 is also an environmentally friendly natural refrigerant with better refrigeration efficiency. It still has a considerable heating effect in a low temperature environment of -20℃ and has excellent thermal properties. However, R290 is flammable and explosive. If it is used in the existing heat pump air conditioning system, it has great safety hazards due to the complexity of the system and the large amount of filling. Therefore, a heat pump air conditioning system that can use R290 refrigerant is urgently needed.

[0004] For example, patent CN220742644U discloses an R290 heat pump thermal management system for new energy vehicles, in which the refrigerant outlet of the electric compressor is connected to the refrigerant inlet of the water-cooled condenser, the refrigerant outlet of the water-cooled condenser is connected to the refrigerant inlet of the liquid storage tank, the refrigerant outlet of the liquid storage tank is connected to the refrigerant inlet of battery cooler 1 and battery cooler 2, the refrigerant outlets of battery cooler 1 and battery cooler 2 are connected to the refrigerant inlet of the electric compressor, and the refrigerant inlet of battery cooler 1 and battery cooler 2 is provided with electronic expansion valve 1 and electronic expansion valve 2. It uses R290 refrigerant with low GWP value, has excellent thermal properties, and has strong low-temperature heating capacity; but this solution is only partially integrated, and the integration is not high. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a heat pump air conditioning system for electric vehicles and a working method thereof, so as to achieve a highly integrated module setting, simplify the system, and improve the safety of the system.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A heat pump air conditioning system for electric vehicles includes a thermal management integrated module, wherein the thermal management integrated module includes a cooler, an electronic expansion valve, a PT sensor, a coaxial tube, an electronic bypass valve, an electric compressor, a liquid storage tank, a water-cooled condenser, a water pump, an eight-way valve, a four-way valve and a one-way valve; various parts of the thermal management integrated module are connected through a channel integrated in the module, and the thermal management integrated module is provided with a group of pipe openings for connecting with an external front-end module, an electric drive assembly, an expansion kettle, a power battery and an HVAC assembly.

[0008] The cooler includes a cooler refrigerant side and a cooler cooling liquid side, and the water-cooled condenser includes a water-cooled condenser refrigerant side and a water-cooled condenser cooling liquid side.

[0009] The refrigerant side of the cooler, the electronic expansion valve, the liquid storage tank, the refrigerant side of the water-cooled condenser and the electric compressor are connected to form a refrigerant circulation branch, and coaxial tubes are arranged between the branches.

[0010] The coolant side of the cooler, the coolant side of the water-cooled condenser, the water pump, the eight-way valve, the four-way valve and the three-way valve are connected to form a coolant circulation branch.

[0011] The group of pipe openings includes a first pipe opening, a second pipe opening, a seventh pipe opening and an eighth pipe opening. The first pipe opening is connected to one end of the coolant side of the water-cooled condenser through a first water pump, and the second pipe opening is connected to the other end of the coolant side of the water-cooled condenser through a four-way valve. The HVAC assembly includes an air PTC, a heater core and an air cooler. Both ends of the heater core are respectively connected to the first pipe opening and the second pipe opening, and both ends of the air cooler are respectively connected to the coolant circulation branch through the seventh pipe opening and the eighth pipe opening.

[0012] The group of pipe openings also includes a fifth pipe opening and a sixth pipe opening, the fifth pipe opening is connected to the four-way valve, the sixth pipe opening is connected to the eight-way valve, and both ends of the radiator of the front-end module are respectively connected to the fifth pipe opening and the sixth pipe opening.

[0013] The group of pipe openings also includes a third pipe opening and a fourth pipe opening, the third pipe opening is connected to the eight-way valve through the second water pump, and the fourth pipe opening is directly connected to the eight-way valve. A cooling cavity is provided in the electric drive assembly, and two ends of the cooling cavity are respectively connected to the third pipe opening and the fourth pipe opening.

[0014] The group of pipe openings also includes a ninth pipe opening and a tenth pipe opening, the ninth pipe opening is connected to the eight-way valve through a third water pump, the tenth pipe opening is directly connected to the eight-way valve, and both ends of the cooling structure of the power battery are respectively connected to the ninth pipe opening and the tenth pipe opening.

[0015] The group of pipe openings also includes an eleventh pipe opening, and the eight-way valve and the expansion kettle are connected via the eleventh pipe opening.

[0016] A working method of the heat pump air conditioning system for electric vehicles can realize the following modes by controlling the working state of the valve: air conditioning cooling and heating mode, battery circuit temperature control system mode, and electric drive circuit cooling working mode.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The heat pump air-conditioning system and working method for electric vehicles are reasonably designed. By integrating all the parts of the refrigerant circuit into the thermal management integrated module, the traditional air-conditioning pipeline is eliminated, the charge amount of R290 refrigerant is reduced, and the safety of the system is ensured. The entire coolant system uses only one radiator, and the cooling and heating of the battery are achieved only through an eight-way valve, a three-way valve and a cooler, so the number of parts is reduced as much as possible, and fewer parts are used to achieve more functions, which can reduce costs and simplify the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a brief description of the contents and symbols in the drawings of this specification:

[0020] Figure 1 It is a schematic diagram of the heat pump air conditioning system for electric vehicles of the present invention.

[0021] In the figure:

[0022] 1-front-end module, 11-PWM fan, 12-low-temperature radiator;

[0023] 2-Electric drive assembly, 3-CDU, 4-Expansion kettle 1 , 5-Expansion kettle 2 ;

[0024] 6-thermal management integrated module, 61-cooler (agent side), 62-electronic expansion valve, 63-PT sensor 1, 64-coaxial tube (low-pressure end), 65-coaxial tube (high-pressure end), 66-electronic bypass valve, 67-PT sensor 2, 68-electric compressor, 69-liquid storage tank, 610-water-cooled condenser (agent side), 611-water-cooled condenser (coolant side), 612-first water pump, 613-first pipe port, 614-second pipe port , 615-four-way valve, 616-fifth pipe port, 617-fourth pipe port, 618-third pipe port, 619-second water pump, 620-eight-way valve, 621-check valve, 622-cooler (coolant side), 623-eighth pipe port, 624-seventh pipe port, 625-fourth water pump, 626-three-way valve, 627-third water pump, 628-sixth pipe port, 629-eleventh pipe port, 630-ninth pipe port, 631-tenth pipe port;

[0025] 7-HVH, 8-power battery, 9-HVAC assembly, 91-air PTC, 92-heater core, 93-air cooler, 94-blower, 95-air distribution damper. DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0027] like Figure 1As shown, the heat pump air conditioning system for electric vehicles includes a thermal management integrated module 6, a front-end module 1, an electric drive assembly 2, a power battery 8, an HVAC assembly 9 and an expansion kettle; by integrating the parts of the refrigerant circuit in the thermal management integrated module, the air conditioning pipeline in the traditional sense is eliminated, the filling amount of R290 refrigerant is reduced, and the safety of the system is ensured; the entire coolant system uses only one radiator, and the battery is cooled and heated only through an eight-way valve, a three-way valve and a cooler, so as to reduce the number of parts as much as possible, use fewer parts to achieve more functions, reduce costs, and simplify the system.

[0028] The thermal management integrated module includes a cooler, an electronic expansion valve 62, a PT sensor, a coaxial tube, an electronic bypass valve 66, an electric compressor 68, a liquid storage tank 69, a water-cooled condenser, a water pump, an eight-way valve 620, a four-way valve 615, a three-way valve 626 and a one-way valve 621; various parts in the thermal management integrated module are connected through channels integrated in the module, and the thermal management integrated module is provided with a group of pipe openings for connecting with the external front-end module, the electric drive assembly, the expansion kettle, the power battery and the HVAC assembly, which are connected to the corresponding parts through the corresponding pipe openings.

[0029] The cooler includes a cooler refrigerant side and a cooler coolant side, and the water-cooled condenser includes a water-cooled condenser refrigerant side and a water-cooled condenser coolant side.

[0030] The refrigerant side of the cooler, the electronic expansion valve, the liquid storage tank, the refrigerant side of the water-cooled condenser and the electric compressor are connected to form a refrigerant circulation branch, and coaxial tubes are arranged between the branches; a PT sensor 1 63 is arranged on the refrigerant circulation branch near the electronic expansion valve, and a PT sensor 2 67 is arranged on the refrigerant circulation branch near the electric compressor; the coaxial tube includes a coaxial tube (low-pressure end) 64 and a coaxial tube (high-pressure end) 65, the coaxial tube (low-pressure end) is connected to the second side of the PT sensor arranged on the branch, and the coaxial tube (high-pressure end) is connected to one side of the PT sensor arranged on the branch; the refrigerant side of the water-cooled condenser is the water-cooled condenser (agent side) 610, and the refrigerant side of the cooler is the cooler (agent side) 61, and a bypass branch is formed between the water-cooled condenser (agent side) and the cooler (agent side) through a pipeline and an electronic bypass valve.

[0031] The coolant side of the cooler, the coolant side of the water-cooled condenser, the water pump, the eight-way valve, the four-way valve and the three-way valve are connected to form a coolant circulation branch; the coolant side of the cooler is the cooler (coolant side) 622, the coolant side of the water-cooled condenser is the water-cooled condenser (coolant side) 611, one end of the cooler (coolant side) is connected to a valve port of the eight-way valve through the fourth water pump 625 and the three-way valve, the other end of the cooler (coolant side) is connected to the coolant circulation branch, and the pipeline between the three-way valve and the eight-way valve is connected to the coolant circulation branch through a one-way valve 621.

[0032] A group of nozzles on the thermal management integrated module includes a first nozzle 613, a second nozzle 614, a third nozzle 618, a fourth nozzle 617, a fifth nozzle 616, a sixth nozzle 628, a seventh nozzle 624, an eighth nozzle 623, a ninth nozzle 630, a tenth nozzle 631 and an eleventh nozzle 629.

[0033] The first pipe outlet is connected to one end of the coolant side of the water-cooled condenser through the first water pump 612, and the second pipe outlet is connected to the other end of the coolant side of the water-cooled condenser through a four-way valve; the HVAC assembly 9 includes an air PTC 91 (air heater), a warm air core 92, an air cooler 93, a blower 94 and an air distribution damper 95; the two ends of the warm air core are respectively connected to the first pipe outlet and the second pipe outlet, the seventh pipe outlet is connected to the three-way valve, the eighth pipe outlet is connected to the eight-way valve, and the two ends of the air cooler are respectively connected to the coolant circulation branch through the seventh pipe outlet and the eighth pipe outlet.

[0034] The fifth pipe port is connected to the four-way valve, the sixth pipe port is connected to the eight-way valve, the front-end module includes a PWM fan 11 and a low-temperature radiator 12; the two ends of the radiator of the front-end module are respectively connected to the fifth pipe port and the sixth pipe port; the connecting pipe between the radiator and the sixth pipe port is connected to an expansion kettle 1 4.

[0035] The third pipe outlet is connected to the eight-way valve through the second water pump 619, the fourth pipe outlet is directly connected to the eight-way valve, the electric assembly 2 is connected to the CDU 3 (on-board charger), and a cooling cavity is provided in the electric drive assembly, and both ends of the cooling cavity are respectively connected to the third pipe outlet and the fourth pipe outlet.

[0036] The ninth pipe port is connected to the eight-way valve through the third water pump 627, the tenth pipe port is directly connected to the eight-way valve, the HVH 7 is connected to the power battery 8, one side of the HVH is connected to the ninth pipe port, and one side of the power battery is connected to the tenth pipe port; the eight-way valve and the expansion kettle 2 5 are connected through the eleventh pipe opening.

[0037] The present invention also provides a working method of a heat pump air conditioning system for an electric vehicle, which can realize the following modes by controlling the working state of the valve: air conditioning cooling and heating mode, battery circuit temperature control system mode, and electric drive circuit cooling working mode.

[0038] Preferred embodiments of the present invention are:

[0039] An R290 heat pump air conditioning system for electric vehicles, including a front-end cooling module, a PWM fan, a low-temperature radiator, an electric drive assembly, a CDU, and an expansion kettle 1 , Expansion kettle 2, thermal management integrated module, cooler, electronic expansion valve, PT sensor, coaxial tube, electronic bypass valve, electric compressor, liquid storage tank, water-cooled condenser, first water pump, four-way valve, second water pump, eight-way valve, one-way valve, fourth water pump, three-way valve, third water pump, HVH, power battery, HVAC assembly and connection channels between various parts and nozzles for connecting external parts. The nozzles of the thermal management integrated module include: the first nozzle, the second nozzle, the third nozzle, the fourth nozzle, the fifth nozzle, the sixth nozzle, the seventh nozzle, the eighth nozzle, the ninth nozzle, the tenth nozzle and the eleventh nozzle.

[0040] The eight-way valve can achieve six modes, as follows:

[0041] Mode 1: air conditioning cooling, battery fast charging, motor heat dissipation;

[0042] Mode 2: Water source heat pump, battery self-circulation;

[0043] Mode 3: The motor heats the battery;

[0044] Mode 4: Water source heat pump, motor recycling;

[0045] Mode 5: Battery and motor large cycle;

[0046] Mode 6: The battery dissipates heat through LTR (low temperature radiator);

[0047] In each mode, the valve port connections are shown in the following table:

[0048] Valve 1 Valve 2 Valve 3 Valve 4 Valve 5 Valve 6 Valve 7 Valve 8 Mode 1 A A B B C C D D Mode 2 A B A C D C D B Mode 3 A B C B C D A D Mode 4 A B A C B C D D Mode 5 A A B C B C D D Mode 6 A B C B D A D C

[0049] The four-way valve can realize two modes, as follows:

[0050] Valve 1 Valve 2 Valve 3 Valve 4 Mode 1 A A B B Mode 2 A B B A

[0051] The above two tables explain: the letters mean that two valve ports are connected, for example, mode 1: valve 1 and valve 2 are connected, valve 3 and valve 4 are connected, valve 5 and valve 6 are connected, valve 7 and valve 8 are connected. Mode 2: valve 1 and valve 3 are connected, valve 4 and valve 6 are connected, valve 2 and valve 8 are connected, valve 5 and valve 7 are connected.

[0052] The three-way valve can realize three modes, as follows:

[0053] Valve 1 Valve 2 Valve 3 Mode 1 open open close Mode 2 open control control Mode 3 open close open

[0054] The HVAC assembly includes the blower, air distribution damper, air PTC, heater core and air cooler.

[0055] In the thermal management integrated module, on the refrigerant side, the electric compressor, water-cooled condenser (agent side), liquid storage tank, coaxial tube, cooler (agent side), electronic expansion valve, electronic bypass valve, PT sensor 1, and PT sensor 2 are integrated in the thermal management integrated module. The components on the refrigerant side are connected through the internal refrigerant channel designed in the thermal management integrated module, eliminating the traditional air conditioning pipe, saving layout space and reducing costs, and can reduce the pressure loss of the system and improve system efficiency. After the refrigerant is compressed into high-temperature and high-pressure gas by the electric compressor, it is divided into two paths. One path passes through the water-cooled condenser (agent side) and exchanges heat with the water-cooled condenser (coolant side) to become a medium-temperature and high-pressure liquid, flows through the liquid storage tank, coaxial tube (high-pressure end), and enters the cooler (agent side) after expansion through the electronic expansion valve, and exchanges heat with the cooler (coolant side). After the heat exchange, the low-temperature and low-pressure refrigerant returns to the electric compressor through the coaxial tube (low-pressure end). On the other hand, when the suction temperature of the electric compressor is too low, the electronic bypass valve opens according to demand, and a part of the high-temperature and high-pressure refrigerant from the electric compressor passes through the electronic bypass valve, merges with the low-temperature and low-pressure refrigerant from the cooler (agent side), and returns to the electric compressor together, thereby raising the suction temperature of the compressor to ensure the normal operation of the system. PT sensor 1 is set at the suction port of the compressor, and PT sensor 2 is set between the high-pressure end of the coaxial tube and the electronic expansion valve.

[0056] In the thermal management integrated module, on the coolant side, the first water pump outlet is connected to the first pipe port, the second pipe port is connected to the four-way valve 1, the four-way valve 2 is connected to the water-cooled condenser inlet, and the water-cooled condenser outlet is connected to the first water pump inlet. The second water pump outlet is connected to the third pipe port, the fourth pipe port is connected to the eight-way valve 5, and the eight-way valve 7 is connected to the second water pump inlet. The eight-way valve 6 is connected to the four-way valve 3, the four-way valve 4 is connected to the fifth pipe port, and the sixth pipe port is connected to the eight-way valve 8. The eight-way valve 2 is connected to the three-way valve 3 in one way, the one-way valve inlet is connected in one way, and the one-way valve outlet is connected to the eight-way valve 4. The three-way valve 2 is connected to the seventh pipe port, the three-way valve 1 is connected to the fourth water pump inlet, the fourth water pump outlet is connected to the cooler (coolant side) inlet, and the cooler (coolant side) outlet is divided into two ways, one way is connected to the eighth pipe port, and the other way is connected to the eight-way valve 4. The third water pump outlet is connected to the ninth pipe outlet, the tenth pipe outlet is connected to the eight-way valve 1, the eight-way valve 3 is connected to the water pump inlet, and the water supply port is arranged between the water pump inlet and the eight-way valve 3. The connection channels of the above components in the thermal management integrated module are all internal coolant channels of the thermal management integrated module, which reduces the water pipes in the traditional sense, saves space and reduces costs.

[0057] Each nozzle of the thermal management integrated module is connected to external components respectively. The first nozzle is connected to the heater core inlet, and the heater core outlet is connected to the second nozzle. The air cooler inlet is connected to the eighth nozzle, and the air cooler outlet is connected to the seventh nozzle. The fifth nozzle is connected to the low-temperature radiator inlet, and the low-temperature radiator outlet is connected to the sixth nozzle. A degassing port is provided on the pipeline between the sixth nozzle and the low-temperature radiator inlet, which is connected to the degassing port of the expansion kettle 1. A water replenishment port is provided on the pipeline between the low-temperature radiator outlet and the sixth nozzle, and the water replenishment port is connected to the water replenishment nozzle of the expansion kettle 1. The ninth nozzle is connected to the HVH inlet, and the power battery outlet is connected to the tenth nozzle. The eighth nozzle is connected to the air cooler inlet, and the air cooler is connected to the seventh nozzle. A degassing port is provided between the eighth nozzle and the air cooler, which is connected to the expansion kettle. 2 The degassing port is connected to the expansion kettle. 2 The water inlet is connected.

[0058] When used in the R290 heat pump air conditioning system for electric vehicles, it has the following modes:

[0059] 1. Air conditioning, refrigeration and heating

[0060] 1) Passenger compartment cooling mode:

[0061] In this mode, the electric compressor, the first water pump, the second water pump, the third water pump, and the PWM fan are running, the four-way valve is in mode 2, the three-way valve is in mode 1, and the eight-way valve is in mode 1. After the low-temperature and low-pressure gaseous refrigerant enters the electric compressor, it is compressed into a high-temperature and high-pressure gaseous refrigerant by the electric compressor and transported to the water-cooled condenser (agent side) for condensation. The condensed refrigerant passes through the liquid storage tank to become a high-temperature and high-pressure liquid refrigerant, and then passes through the coaxial tube (high-pressure end) to reach the electronic expansion valve. After being throttled and reduced in pressure by the electronic expansion valve, it enters the cooler (agent side) to evaporate and absorb heat, forming a low-temperature and low-pressure gaseous refrigerant that flows out of the cooler (agent side), and then returns to the electric compressor through the coaxial tube (low-pressure end), completing the refrigerant circuit cycle. After the high-temperature coolant in the cooler (coolant side) is heat-exchanged with the low-temperature refrigerant in the cooler (agent side), a low-temperature coolant is formed, which enters the air cooler through the eighth pipe port of the thermal management integrated module and cools the hot air around the air cooler. At the same time, the blower sends the cold air at the air cooler to the passenger compartment to achieve passenger compartment cooling. The coolant after heat exchange in the air cooler passes through valve 2 and valve 1 of the three-way valve in sequence through the seventh pipe port of the thermal management integrated module, and then enters the fourth water pump, and then the fourth water pump delivers the coolant to the air cooler for cooling. The coolant in the water-cooled condenser (coolant side) that has heat exchanged with the refrigerant in the water-cooled condenser (agent side) enters the warm air core through the first pipe port of the thermal management integrated module by the first water pump, and then passes through valve 1 and valve 4 of the four-way valve in sequence through the second pipe port, and valve 1 and valve 4 of the four-way valve are connected. It flows into the low-temperature radiator through the fifth pipe outlet, and after heat exchange with the external air, it enters the eight-way valve 8 through the sixth pipe outlet, the eight-way valve 8 is connected to valve 7, flows out from the eight-way valve 7 and enters the second water pump, and then flows into the CDU and the electric drive through the third pipe outlet, enters the eight-way valve 5 through the fourth pipe outlet, the eight-way valve 5 is connected to valve 6, flows out from the eight-way valve 6, to the four-way valve 3, the four-way valve 3 is connected to valve 2, and flows back to the water-cooled condenser (coolant side) from the four-way valve 2.

[0062] 2) Heat pump heating mode

[0063] In this mode, the electric compressor works to complete the refrigerant circuit circulation, while the first water pump works and the four-way valve is in mode 1. The coolant with a higher temperature in the water-cooled condenser (coolant side) after heat exchange with the high-temperature refrigerant compressed by the electric compressor enters the heater core through the first pipe port of the thermal management integrated module by the first water pump and heats the air in the passenger compartment. At the same time, the blower delivers the heated air to the passenger compartment to achieve heating of the passenger compartment heat pump air conditioning. Then, it passes through valve 1 and valve 2 of the four-way valve in sequence through the second pipe port. Valve 1 and valve 2 of the four-way valve are connected, and the coolant flows out of valve 2 of the four-way valve and returns to the water-cooled condenser.

[0064] When the ambient temperature is lower than -10℃, the air inlet temperature of the electric compressor is too low, which will cause liquid hammer in the electric compressor and damage the compressor. In the heat pump air conditioning mode, the electronic bypass valve is opened, and part of the high-temperature gaseous refrigerant at the outlet of the electric compressor is mixed with the low-temperature refrigerant flowing out of the cooler (agent side) through the electronic bypass valve, so that the refrigerant temperature rises and enters the air inlet of the compressor through the coaxial tube (low-pressure end), preventing liquid refrigerant from entering the electric compressor and damaging the compressor, thus ensuring the normal operation of the heat pump air conditioning system.

[0065] 3) Passenger cabin air PTC heating mode

[0066] In extremely cold environments, heat pump air conditioning cannot meet heating needs. At this time, the air PTC in the HVAC assembly works. The air PTC heats the cold air around it, and at the same time the blower delivers the heated air to the passenger compartment to heat the passenger compartment, realizing auxiliary heating of the air PTC.

[0067] 4) Dehumidification and defogging mode for the passenger compartment

[0068] The electric compressor works to complete the refrigerant circuit cycle. The first water pump works, the fourth water pump works, the four-way valve is in mode one, and the three-way valve is in mode one. After the higher temperature coolant in the cooler (coolant side) is heat-exchanged with the low temperature refrigerant in the cooler (agent side), a low temperature coolant is formed, which enters the air cooler through the eighth nozzle of the thermal management integrated module, and cools and dehumidifies the humid air around the air cooler. This process is the same as the refrigeration of the passenger compartment. Then, through the heat pump air conditioning mode, the coolant in the water-cooled condenser that has heat exchanged with the high temperature refrigerant is heated and transported to the heater core to heat the air around it. The dry hot air at the heater core is sent to the passenger compartment by the blower to remove the mist on the windows and achieve dehumidification and defogging of the passenger compartment.

[0069] 2. Battery circuit temperature control:

[0070] 1) Battery forced cooling mode:

[0071] The electric compressor starts to complete the refrigerant circuit circulation. At the same time, the third water pump and the fourth water pump are running, or the third water pump and the fourth water pump are running alone. The eight-way valve is in mode five, the three-way valve is in mode three, and the HVH does not work. After the coolant exchanges heat with the battery cells in the power battery, a higher temperature coolant is formed, which enters the eight-way valve 1 through the tenth pipe port of the thermal management integrated module. Valve 1 and valve 2 of the eight-way valve are connected. From the eight-way valve 2, it enters valve 3 and valve 1 of the three-way valve in turn, enters the fourth water pump, and is transported to the cooler (coolant side) by the fourth water pump. After the higher temperature coolant in the cooler (coolant side) exchanges heat with the low-temperature refrigerant in the cooler (agent side), a lower temperature coolant is formed, which flows into the eight-way valve 4. The eight-way valve 4 and valve 3 are connected. The low-temperature coolant enters the third water pump from the eight-way valve 3, and then flows into the HVH through the ninth pipe port of the thermal management integrated module, and finally returns to the power battery, exchanges heat with the battery cells of the power battery, cools the power battery, and realizes forced cooling of the battery.

[0072] 2)Battery temperature equalization mode

[0073] Battery HVH heating mode 1: The third water pump is running, the HVH is not working, and the eight-way valve is in mode 2. The coolant enters the power battery after passing through the HVH, and exchanges heat with the cells of the power battery, so that the cells inside the power battery exchange heat evenly. The coolant with a lower temperature after heat exchange enters the eight-way valve 1 of the thermal management integrated module through the tenth pipe port of the thermal management integrated module. The eight-way valve 1 and valve 3 are connected, and enter the third water pump through the eight-way valve 3. The third water pump transports the coolant with a lower temperature to the HVH through the ninth pipe port of the thermal management integrated module to achieve battery HVH heating.

[0074] Battery HVH heating mode 2: The third water pump is running, the HVH is working, the eight-way valve is in mode 1, and the three-way valve is in mode 1. The coolant enters the power battery after passing through the HVH, and exchanges heat with the cells of the power battery, so that the cells inside the power battery exchange heat evenly. The coolant with a lower temperature after heat exchange enters the eight-way valve 1 of the thermal management integrated module through the tenth pipe port of the thermal management integrated module. The eight-way valve 1 is connected to the valve 2, and flows from the eight-way valve 1 through the one-way valve into the eight-way valve 4. The eight-way valve 4 is connected to the valve 3, and enters the third water pump through the eight-way valve 3. The third water pump delivers the coolant with a lower temperature to the HVH through the ninth pipe port of the thermal management integrated module to achieve battery HVH heating.

[0075] 3) Battery HVH heating mode

[0076] Battery HVH heating mode 1: The third water pump is running, the HVH is working, and the eight-way valve is in mode 2. The coolant is heated by the HVH and enters the power battery, exchanges heat with the cells of the power battery, and heats the power battery. The coolant with a lower temperature after heat exchange enters the eight-way valve 1 of the thermal management integrated module through the tenth pipe port of the thermal management integrated module. The eight-way valve 1 is connected to the valve 3, and enters the third water pump through the eight-way valve 3. The third water pump delivers the coolant with a lower temperature to the HVH through the ninth pipe port of the thermal management integrated module to achieve battery HVH heating.

[0077] Battery HVH heating mode 2: The third water pump is running, the HVH is working, the eight-way valve is in mode 1, and the three-way valve is in mode 2. The coolant is heated by the HVH and enters the power battery, exchanges heat with the cells of the power battery, and heats the power battery. The coolant with a lower temperature after heat exchange enters the eight-way valve 1 of the thermal management integrated module through the tenth pipe port of the thermal management integrated module. The eight-way valve 1 is connected to the valve 2, and flows from the eight-way valve 1 through the one-way valve into the eight-way valve 4. The eight-way valve 4 is connected to the valve 3, and enters the third water pump through the eight-way valve 3. The third water pump delivers the coolant with a lower temperature to the HVH through the ninth pipe port of the thermal management integrated module to achieve battery HVH heating.

[0078] 4) Battery cooling mode through low temperature radiator

[0079] In this mode, the third water pump is running, the HVH is not working, the eight-way valve is in mode 6, and the four-way valve is in mode 1. After the coolant enters the power battery, it exchanges heat with the battery cell of the power battery. After the heat exchange, the coolant with a higher temperature flows into the eight-way valve 1 of the thermal management integrated module through the tenth pipe port of the thermal management integrated module. The valve 1 of the eight-way valve is connected to the valve 6. The coolant flows into the valve 3 of the four-way valve from the valve 6 of the eight-way valve. The valve 3 of the four-way valve is connected to the valve 4. The coolant with a higher temperature flows out of the thermal management integrated module through the fifth pipe port of the four-way valve 4 and enters the low-temperature radiator. It exchanges heat with the colder air outside through the low-temperature radiator to form a coolant with a lower temperature. It flows into the valve 8 of the eight-way valve of the thermal management integrated module through the sixth pipe port of the thermal management integrated module. The valve 8 of the eight-way valve is connected to the valve 3 of the eight-way valve. It flows into the third water pump through the valve 3 of the eight-way valve. The third water pump delivers it to the HVH through the ninth pipe port of the thermal management integrated module and finally flows into the power battery. The battery is cooled by a low-temperature radiator.

[0080] 5) Battery heating mode through electric drive waste heat

[0081] In this mode, the second water pump and the third water pump are in motion or the second water pump and the third water pump are in single operation, the eight-way valve is in mode three, and the HVH does not work. After being heated by the electric drive, the coolant enters the fourth pipe port of the thermal management integrated module and flows to valve 5 of the eight-way valve, then to valve 3 of the eight-way valve, enters the third water pump, is transported to the HVH by the third water pump, and then enters the power battery to exchange heat with the power battery to heat the power battery. After the heat exchange, the coolant with a lower temperature enters the tenth pipe port of the thermal management integrated module, flows to valve 1 of the eight-way valve, then to valve 7 of the eight-way valve, enters the second water pump, and the second water pump transports the coolant to the CDU, and then flows into the electric drive to exchange heat with the electric drive. The waste heat of the electric drive is used to heat the battery.

[0082] 3. The cooling working mode of the electric drive circuit is as follows:

[0083] 1) Electric drive self-circulation mode

[0084] When the temperature of the electric drive is not high and does not need to be cooled by the radiator, the electric drive can be self-circulated for heat dissipation. The second water pump is started, and the eight-way valve is in mode 2. After the coolant in the electric drive assembly absorbs the heat of the electric drive assembly, it enters valves 5 and 7 of the eight-way valve in sequence through the fourth pipe opening. Valve 5 and valve 7 of the eight-way valve are connected, and the coolant flows from valve 7 of the eight-way valve into the second water pump, and is transported to the CDU and the electric drive by the second water pump.

[0085] 2) Electric drive heat dissipation mode through low temperature radiator

[0086] When the heat load of the electric drive increases, it is necessary to dissipate heat through the low-temperature radiator. The second water pump is working, the eight-way valve is in mode five, the four-way valve is in mode one, and the PWM fan is working. After the coolant in the electric drive assembly absorbs the heat of the electric drive assembly, it enters valve 5 and valve 6 of the eight-way valve in sequence through the fourth pipe port, and valves 5 and 6 of the eight-way valve are connected, and then enters valve 4 of the four-way valve, flows out from valve 4 of the four-way valve, and valves 3 and valve 4 of the four-way valve are connected. Then it flows into the low-temperature radiator through the fifth pipe port, and exchanges heat with the lower temperature air outside, and the hot air after heat exchange is taken away by the fan. The coolant cooled by the low-temperature radiator flows into valve 8 of the eight-way valve through the sixth pipe port, and valves 8 and valve 7 of the eight-way valve are connected. The coolant enters the second water pump from valve 7, and is transported to the CDU and the electric drive assembly by the second water pump, and absorbs the heat in the electric drive assembly again.

[0087] 3) Electric drive heat recovery mode

[0088] In extremely cold working conditions, the waste heat of the electric drive can also be recovered to increase the suction temperature of the electric compressor. The electric compressor works to complete the refrigerant circuit cycle. The third water pump works, the fourth water pump works, or the third water pump and the fourth water pump are operated alone, the eight-way valve is in mode four, the four-way valve is in mode one, and the three-way valve is in mode three. After the coolant in the electric drive assembly absorbs the heat of the electric drive assembly, it enters valve 5 of the eight-way valve through the fourth pipe mouth. Valve 5 of the eight-way valve is connected to valve 2. The coolant flows from valve 2 of the eight-way valve into valve 3 of the three-way valve, flows out from valve 1 of the three-way valve, enters the fourth water pump, and is transported to the cooler (coolant side) by the fourth water pump, and heat is exchanged with the refrigerant in the cooler (agent side). The cooler (agent side) absorbs heat from the cooler (coolant side), so that the refrigerant temperature of the cooler (agent side) increases, and then the suction port temperature of the electric compressor increases. The low-temperature coolant coming out of the cooler (coolant side) enters valve 4 of the eight-way valve, valve 4 and valve 6 of the eight-way valve are connected, the low-temperature coolant flows out from valve 6 of the eight-way valve, enters valve 3 of the four-way valve, valve 3 and valve 4 of the four-way valve are connected, flows out from valve 4 of the four-way valve, flows into the radiator through the fifth pipe opening, and then flows into valve 8 of the eight-way valve through the sixth pipe opening, valve 8 and valve 7 of the eight-way valve are connected, flows from valve 7 of the eight-way valve into the second water pump, and is transported to the CDU and the electric drive by the second water pump, absorbing heat from the electric drive again.

[0089] The above is only an explanation of the preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0090] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A heat pump air conditioning system for electric vehicles, comprising a thermal management integrated module, characterized in that: The thermal management integrated module includes a cooler, an electronic expansion valve, a PT sensor, a coaxial tube, an electronic bypass valve, an electric compressor, a liquid storage tank, a water-cooled condenser, a water pump, an eight-way valve, a four-way valve and a one-way valve; the various parts of the thermal management integrated module are connected through channels integrated in the module, and the thermal management integrated module is provided with a group of pipe openings for connecting with an external front-end module, an electric drive assembly, an expansion kettle, a power battery and an HVAC assembly.

2. The heat pump air conditioning system for electric vehicles as claimed in claim 1, characterized in that: The cooler includes a cooler refrigerant side and a cooler cooling liquid side, and the water-cooled condenser includes a water-cooled condenser refrigerant side and a water-cooled condenser cooling liquid side.

3. The heat pump air conditioning system for electric vehicles as claimed in claim 2, characterized in that: The refrigerant side of the cooler, the electronic expansion valve, the liquid storage tank, the refrigerant side of the water-cooled condenser and the electric compressor are connected to form a refrigerant circulation branch, and coaxial tubes are arranged between the branches.

4. The heat pump air conditioning system for electric vehicles as claimed in claim 3, characterized in that: The coolant side of the cooler, the coolant side of the water-cooled condenser, the water pump, the eight-way valve, the four-way valve and the three-way valve are connected to form a coolant circulation branch.

5. The heat pump air conditioning system for electric vehicles as claimed in claim 4, characterized in that: The group of pipe openings includes a first pipe opening, a second pipe opening, a seventh pipe opening and an eighth pipe opening. The first pipe opening is connected to one end of the coolant side of the water-cooled condenser through a first water pump, and the second pipe opening is connected to the other end of the coolant side of the water-cooled condenser through a four-way valve. The HVAC assembly includes an air PTC, a heater core and an air cooler. Both ends of the heater core are respectively connected to the first pipe opening and the second pipe opening, and both ends of the air cooler are respectively connected to the coolant circulation branch through the seventh pipe opening and the eighth pipe opening.

6. The heat pump air conditioning system for electric vehicles as claimed in claim 5, characterized in that: The group of pipe openings also includes a fifth pipe opening and a sixth pipe opening, the fifth pipe opening is connected to the four-way valve, the sixth pipe opening is connected to the eight-way valve, and both ends of the radiator of the front-end module are respectively connected to the fifth pipe opening and the sixth pipe opening.

7. The heat pump air conditioning system for electric vehicles as claimed in claim 6, characterized in that: The group of pipe openings also includes a third pipe opening and a fourth pipe opening, the third pipe opening is connected to the eight-way valve through the second water pump, and the fourth pipe opening is directly connected to the eight-way valve. A cooling cavity is provided in the electric drive assembly, and two ends of the cooling cavity are respectively connected to the third pipe opening and the fourth pipe opening.

8. The heat pump air conditioning system for electric vehicles as claimed in claim 7, characterized in that: The group of pipe openings also includes a ninth pipe opening and a tenth pipe opening, the ninth pipe opening is connected to the eight-way valve through a third water pump, the tenth pipe opening is directly connected to the eight-way valve, and both ends of the cooling structure of the power battery are respectively connected to the ninth pipe opening and the tenth pipe opening.

9. The heat pump air conditioning system for electric vehicles as claimed in claim 8, characterized in that: The group of pipe openings also includes an eleventh pipe opening, and the eight-way valve and the expansion kettle are connected via the eleventh pipe opening.

10. A method for operating the heat pump air conditioning system for an electric vehicle as claimed in claim 9, characterized in that: The working method can realize the following modes by controlling the working state of the valve: air conditioning cooling and heating mode, battery circuit temperature control system mode, and electric drive circuit cooling working mode.

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