Automotive thermal management system

Abstract

The application provides a kind of automobile thermal management system, including refrigerant circulation loop and cooling liquid circulation loop.In refrigerant circulation loop, the exhaust port of compressor COMP is connected with the refrigerant inlet of water-cooled condenser LCC, the refrigerant outlet of water-cooled condenser LCC is connected with the inlet of liquid storage dryer RD, the outlet of liquid storage dryer RD is connected with the high-pressure side inlet of coaxial heat exchanger IHX, the high-pressure side outlet of coaxial heat exchanger IHX is connected with the refrigerant inlet of cooler Chiller through the throttling electronic expansion valve EXV2, the refrigerant outlet of cooler Chiller is connected with the low-pressure side inlet of coaxial heat exchanger IHX, the low-pressure side outlet of coaxial heat exchanger IHX is connected with the suction port of compressor COMP, the parallel connection of air charging electronic expansion valve EXV1 is in the two ends of compressor COMP, and cooling liquid circulation loop exchanges heat with refrigerant circulation loop through cooler Chiller, water-cooled condenser LCC.The automobile thermal management system of the application simplifies refrigerant circulation loop, is more integrated modularization, refrigerant charging amount is less, and is compatible with flammable refrigerant.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management, and in particular to an automobile thermal management system. Background Art

[0002] A thermal management system is a comprehensive cooling and heating control solution encompassing air conditioning, batteries, and motors and electronic controls. The heat pump is a key component of a thermal management system, typically referring to the architecture of the air conditioning system. With the automotive industry's pursuit of environmentally friendly and low-carbon development, the current refrigerant R134a used in automotive air conditioners has a high Globally Protected Future (GWP) value, and its use will be gradually reduced. Heat pump systems based on alternative refrigerants such as CO2, R1234yf, and R290 have become a key research and development focus. CO2 has high operating pressures, a low supply chain maturity, and high engineering challenges. R1234yf and R290 are flammable, requiring specialized thermal management system designs for safety reasons. Conventional thermal management systems have complex refrigerant circuit designs, with numerous valves for throttling, on-off, and flow control. This necessitates significant changes in refrigerant circuit configuration when system functional requirements vary significantly, resulting in poor compatibility with integrated modular designs. Current thermal management systems typically require large refrigerant charges, and subsequent transitions to alternative refrigerants present challenges in terms of cost-effectiveness and safety. System optimization is urgently needed. Summary of the Invention

[0003] The present invention is made to solve the above-mentioned problems, and its purpose is to provide an automobile thermal management system.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] An automotive thermal management system includes a refrigerant circulation circuit and a coolant circulation circuit, wherein: the refrigerant circulation circuit includes a compressor COMP, a water-cooled condenser LCC, a cooler Chiller, a throttling electronic expansion valve EXV2, an air-supply electronic expansion valve EXV1, a liquid receiver dryer RD, and a coaxial heat exchanger IHX connected by several pipes; the exhaust port of the compressor COMP is connected to the refrigerant inlet of the water-cooled condenser LCC, the refrigerant outlet of the water-cooled condenser LCC is connected to the inlet of the liquid receiver dryer RD, and the outlet of the liquid receiver dryer RD is connected to the coaxial The high-pressure side inlet of the heat exchanger IHX and the high-pressure side outlet of the coaxial heat exchanger IHX are connected to the refrigerant inlet of the cooler Chiller through the throttling electronic expansion valve EXV2. The refrigerant outlet of the cooler Chiller is connected to the low-pressure side inlet of the coaxial heat exchanger IHX. The low-pressure side outlet of the coaxial heat exchanger IHX is connected to the intake port of the compressor COMP. The air-supply electronic expansion valve EXV1 is connected in parallel at both ends of the compressor COMP. The coolant circulation loop exchanges heat with the refrigerant circulation loop through the cooler Chiller and the water-cooled condenser LCC.

[0006] Furthermore, the refrigerant circulation loop also includes a temperature sensor T, a first temperature and pressure sensor PT1, and a second temperature and pressure sensor PT2. The temperature sensor T is arranged on the pipeline from the exhaust port of the compressor COMP to the refrigerant inlet of the water-cooled condenser LCC, the first temperature and pressure sensor PT1 is arranged on the pipeline from the refrigerant outlet of the water-cooled condenser LCC to the inlet of the liquid storage dryer RD, and the second temperature and pressure sensor PT2 is arranged on the pipeline from the refrigerant outlet of the cooler Chiller to the low-pressure side inlet of the coaxial heat exchanger IHX.

[0007] Furthermore, the water-cooled condenser LCC and the chiller Chiller are both plate heat exchangers.

[0008] Furthermore, the liquid receiver dryer RD is integrated with the coaxial heat exchanger IHX.

[0009] Furthermore, the coolant circulation loop includes a low-temperature radiator LTR, a motor electronic control MCU & MTR, a battery pack BATT, a heater core HTR, a cooler core Cooler, several water pumps and a water valve assembly connected by several pipes.

[0010] Furthermore, there are 4 water pumps, namely the first electronic water pump PUMP1, the second electronic water pump PUMP2, the third electronic water pump PUMP3 and the fourth electronic water pump PUMP4. The first electronic water pump PUMP1 is used to pump coolant to the water-cooled condenser LCC, the second electronic water pump PUMP2 is used to pump coolant to the cold air core Cooler, the third electronic water pump PUMP3 is used to pump coolant to the battery pack BATT, and the fourth electronic water pump PUMP4 is used to pump coolant to the motor electronic control MCU&MTR and the water-cooled condenser LCC.

[0011] Furthermore, the coolant circulation loop also includes a first expansion water tank TANK1 with three fluid replenishment ports, a second expansion water tank TANK2 with two fluid replenishment ports, and a fluid replenishment exhaust pipe is connected to the low-temperature radiator LTR. The three fluid replenishment ports of the first expansion water tank TANK1 are respectively connected to the inlet of the third electronic water pump PUMP3, the inlet of the fourth electronic water pump PUMP4 and the fluid replenishment exhaust pipe on the low-temperature radiator LTR; the two fluid replenishment ports of the second expansion water tank TANK2 are respectively connected to the inlet of the first electronic water pump PUMP1 and the inlet of the second electronic water pump PUMP2.

[0012] Furthermore, the water valve assembly includes a first four-way water valve FWV1, a second four-way water valve FWV2, a first three-way water valve TWV1, a second three-way water valve TWV2, ​​a third three-way water valve TWV3, a fourth three-way water valve TW4 and a fifth three-way water valve TWV5. The three valve ports of the first three-way water valve TWV1 are respectively connected to the coolant outlet of the water-cooled condenser LCC, the coolant inlet of the heater core HTR and one of the valve ports of the fourth three-way water valve TW4. The three valve ports of the second three-way water valve TWV2 are respectively connected to the coolant outlet of the heater core HTR, the inlet of the first electronic water pump PUMP1 and the inlet of the second electronic water pump PUMP1. The inlet of the sub-water pump PUMP2 is connected, the three valve ports of the third three-way water valve TWV3 are respectively connected to the coolant outlet of the cooler Chiller, the inlet of the second electronic water pump PUMP2 and one of the valve ports of the first four-way water valve FWV1, the remaining two valve ports of the fourth three-way water valve TWV4 are respectively connected to the coolant outlet of the motor electronic control MCU&MTR and one of the valve ports of the second four-way water valve FWV2, and the three valve ports of the fifth three-way water valve TWV5 are respectively connected to the inlet of the low-temperature radiator LTR, the outlet of the low-temperature radiator LTR and one of the valve ports of the first four-way water valve FWV1.

[0013] Furthermore, the remaining two valve ports of the first four-way water valve FWV1 are respectively connected to the inlet of the third electronic water pump PUMP3 and one of the valve ports of the second four-way water valve FWV2, and the remaining two valve ports of the second four-way water valve FWV2 are respectively connected to the coolant outlet of the battery pack BATT and the coolant inlet of the cooler Chiller.

[0014] Furthermore, the coolant circulation loop also includes a first water tee TW1, a second water tee TW2, a third water tee TW3, a fourth water tee TW4 and a fifth water tee TW5 for connecting pipelines. The three interfaces of the fifth water tee TW5 are respectively connected to a valve port of the fifth three-way water valve TWV5, the outlet of the low-temperature radiator LTR and the inlet of the fourth electronic water pump PUMP4; the three interfaces of the fourth water tee TW4 are respectively connected to the outlet of the fourth electronic water pump PUMP4, the coolant inlet of the motor electronic control MCU / MTR and the first water tee. One interface of TW1; the three interfaces of the third water channel tee TW3 are respectively connected to a valve port of the second four-way water valve FWV2, the coolant inlet of the cooler Chiller and the coolant outlet of the cold air core Cooler; the three interfaces of the second water channel tee TW2 are respectively connected to a valve port of the third three-way water valve TWV3, a valve port of the second three-way water valve TWV2 and the inlet of the second electronic water pump PUMP2; the remaining two interfaces of the first water channel tee TW1 are respectively connected to the coolant inlet of the water-cooled condenser LCC and the outlet of the first electronic water pump PUMP1.

[0015] The present invention has the following beneficial effects:

[0016] 1. The automotive thermal management system of this invention simplifies the refrigerant circulation loop, making the system structure more integrated and modular. This modularization reduces the number and length of pipes in the system's refrigerant circulation loop, lowering refrigerant circuit resistance and improving performance. This modularization also reduces the weight and volume of the thermal management system, increasing heat exchange per unit weight and volume, and improving the vehicle's endurance.

[0017] 2. The refrigerant charge in the refrigerant circulation loop is small, and the initial investment and subsequent maintenance costs are low; the refrigerant does not enter the passenger compartment, which improves safety; it is compatible with low-GWP flammable refrigerants such as R1234yf and R290, making it more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a connection diagram of an automobile thermal management system according to an embodiment of the present invention;

[0019] Figure 2 1 is a schematic diagram of the refrigerant and coolant flow in an embodiment of the present invention;

[0020] Figure 3 is a refrigerant and coolant flow diagram under mode 2 in an embodiment of the present invention;

[0021] Figure 4 is a refrigerant and coolant flow diagram under mode three in an embodiment of the present invention;

[0022] Figure 5 is a refrigerant and coolant flow diagram under mode 4 in an embodiment of the present invention;

[0023] Figure 6 is a refrigerant and coolant flow diagram under mode five in an embodiment of the present invention;

[0024] Figure 7 is a refrigerant and coolant flow diagram under mode 6 in an embodiment of the present invention;

[0025] Figure 8 is a refrigerant and coolant flow diagram under mode seven in an embodiment of the present invention;

[0026] Figure 9 is a refrigerant and coolant flow diagram under mode eight in an embodiment of the present invention;

[0027] Figure 10 is a refrigerant and coolant flow diagram under mode nine in an embodiment of the present invention;

[0028] Figure 11 is a refrigerant and coolant flow diagram in mode 10 in an embodiment of the present invention;

[0029] Figure 12 is a refrigerant and coolant flow chart in mode ten in the embodiment of the present application;

[0030] Figure 13 is a refrigerant and coolant flow chart in mode twelve in the embodiment of the present application;

[0031] Figure 14 is a refrigerant and coolant flow chart in mode thirteen in the embodiment of the present application.

[0032] Reference signs:

[0033] 1 - motor control MCU & MTR, 2 - battery pack BATT, 3 - air conditioning box HVAC, 11 - compressor COMP, 12 - water-cooled condenser LCC, 13 - chiller, 14 - throttling electronic expansion valve EXV2, 15 - air supplementing electronic expansion valve EXV1, 161 - liquid storage dryer RD, 162 - coaxial heat exchanger IHX, 17 - temperature sensor T, 18 - first temperature and pressure sensor PT1, 19 - second temperature and pressure sensor PT2, 21 - first expansion water tank TANK1, 22 - second expansion water tank TANK2, 23 - low-temperature radiator LTR, 24 - warm air core HTR, 25 - cold air core Cooler, 261 - first electronic water pump PUMP1, 262 - second electronic water pump PUMP2, 263 - third electronic water pump PUMP3, 264 - fourth electronic water pump PUMP4, 271 - first four-way water valve FWV1, 272 - second four-way water valve FWV2, 281 - first three-way water valve TWV1, 282 - second three-way water valve TWV2, 283 - third three-way water valve TWV3, 284 - fourth three-way water valve TWV4, 285 - fifth three-way water valve TWV5, 291 - first waterway three-way TW1, 292 - second waterway three-way TW2, 293 - third waterway three-way TW3, 294 - fourth waterway three-way TW4, 295 - fifth waterway three-way TW5, 30 - coolant temperature sensor. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the following embodiments will be specifically described in combination with the drawings.

[0035] <EMBODIMENT>

[0036] It should be noted that the radiator, sensor, pipe, valve and the like used in the automobile thermal management system of the present embodiment are all common devices, and the present application focuses not on the specific structure of these devices, but on the composition of the components, the connection relationship, the heat exchange mode and the like of the automobile thermal management system.

[0037] As Figure 1 shown, the automobile thermal management system of the embodiment includes a refrigerant circulation loop and a coolant circulation loop, wherein:

[0038] The refrigerant circulation loop includes a compressor COMP11, a water-cooled condenser LCC12, a chiller 13, a throttling electronic expansion valve EXV214, a charge electronic expansion valve EXV115, a receiver drier RD161, and an in-line heat exchanger IHX162 connected by several pipelines.

[0039] The exhaust port of the compressor COMP11 is connected to the refrigerant inlet of the water-cooled condenser LCC12, the refrigerant outlet of the water-cooled condenser LCC12 is connected to the inlet of the receiver drier RD161, the outlet of the receiver drier RD161 is connected to the high-pressure side inlet of the in-line heat exchanger IHX162, the high-pressure side outlet of the in-line heat exchanger IHX162 is connected to the refrigerant inlet of the chiller 13 through the throttling electronic expansion valve EXV214, the refrigerant outlet of the chiller 13 is connected to the low-pressure side inlet of the in-line heat exchanger IHX162, and the low-pressure side outlet of the in-line heat exchanger IHX162 is connected to the suction port of the compressor COMP11. The charge electronic expansion valve EXV115 is connected in parallel across the compressor COMP11.

[0040] The coolant circulation loop exchanges heat with the refrigerant circulation loop through the chiller 13 and the water-cooled condenser LCC12.

[0041] Further, the refrigerant circulation loop further includes a temperature sensor T17, a first temperature and pressure sensor PT118, and a second temperature and pressure sensor PT219. The temperature sensor T17 is arranged on the pipeline from the exhaust port of the compressor COMP11 to the refrigerant inlet of the water-cooled condenser LCC12, the first temperature and pressure sensor PT118 is arranged on the pipeline from the refrigerant outlet of the water-cooled condenser LCC12 to the high-pressure side inlet of the in-line heat exchanger IHX162, and the second temperature and pressure sensor PT219 is arranged on the pipeline from the refrigerant outlet of the chiller 13 to the inlet of the receiver drier RD161.

[0042] Specifically, the first temperature and pressure sensor PT118 and the second temperature and pressure sensor PT219 are both combined temperature sensors and pressure sensors, which can detect and measure the temperature and pressure of the refrigerant. In the embodiment, the first temperature and pressure sensor PT118 and the second temperature and pressure sensor PT219 are both plug-in sensors, and the sensor measurement points are in direct contact with the refrigerant. The temperature sensor T17 can detect and measure the temperature of the refrigerant, and can be a plug-in or wall-mounted sensor.

[0043] Furthermore, both the water-cooled condenser LCC12 and the chiller Chiller13 are plate-type heat exchangers. Refrigerant and coolant flow channels are formed by stacking and combining ribbed and corrugated plates. The refrigerant undergoes phase change heat transfer within the water-cooled condenser LCC12. The heat released by condensation is transferred to the coolant through the plates, raising its temperature. The refrigerant undergoes phase change heat transfer within the chiller13. The plates absorb heat from the coolant and cause it to evaporate, cooling it.

[0044] The liquid storage dryer RD161 can adopt the casing type, U-tube type and other structural types. It is equipped with a guide plate, oil return hole, drying bag, filter screen inside. It can separate the liquid refrigerant and gaseous refrigerant, store liquid, return oil, dry, filter, etc., and ensure the appropriate refrigerant flow rate of the system under different operating conditions. At the same time, it can ensure the throttling state before the valve to achieve the regulation and control effect required by the system.

[0045] The coaxial heat exchanger IHX162 can adopt a shell-and-tube type, an integrated type and other structural types. Through the piping design, the refrigerant fluids in both high-temperature and high-pressure states and low-temperature and low-pressure states are introduced into the coaxial heat exchanger IHX162 for flow and heat exchange, thereby reducing the condensing temperature and improving system performance.

[0046] In this embodiment, the receiver-drier RD161 is arranged at the inlet end of the coaxial heat exchanger IHX162 and is integrated with the coaxial heat exchanger IHX162. The specific structure and connection method of the coaxial heat exchanger IHX162 and the receiver-drier RD161 can adopt common forms in the prior art and will not be repeated here.

[0047] The compressor COMP11 performs work on the refrigerant, sucking in low-temperature, low-pressure refrigerant and discharging high-temperature, high-pressure refrigerant. The compressor COMP11 may be a scroll type, a rotary vane type, or a rotor type compressor.

[0048] The throttling electronic expansion valve EXV214 can throttle or shut off the refrigerant in the system. In the throttling mode, the refrigerant realizes isenthalpic throttling after passing through the throttling electronic expansion valve EXV214. In the shut-off mode, the refrigerant is cut off at the throttling electronic expansion valve EXV214.

[0049] The air supply electronic expansion valve EXV115 can throttle or shut off the refrigerant in the system. In the throttling mode, the refrigerant realizes isenthalpic throttling after passing through the air supply electronic expansion valve EXV115. In the shutoff mode, the refrigerant is cut off at the air supply electronic expansion valve EXV115.

[0050] Further, in addition to the chiller Chiller 13 and the water-cooled condenser LCC 12 which exchange heat with the refrigerant circulation loop, the cooling liquid circulation loop further includes the low-temperature radiator LTR 23, the motor control unit MCU & MTR 1, the battery pack BATT 2, the heater core HTR 24, the cooler core Cooler 25, a plurality of water pumps, and a water valve assembly, which are connected by a plurality of pipes. Heat is transferred and transferred by the cooling liquid after exchanging heat with the refrigerant circulation loop at the water-cooled condenser LCC and the chiller Chiller, and then actuating the water valve and the water pump assembly. The motor control unit MCU & MTR 1 and the battery pack BATT 2 have cooling liquid flow channels inside. The motor control unit MCU & MTR 1 and the battery pack BATT 2 are common basic structures of the automotive power system, and will not be described here.

[0051] A cooling liquid temperature sensor 30 is arranged on the pipe at the cooling liquid outlet of the motor control unit MCU & MTR 1, for detecting the temperature of the cooling liquid flowing out of the cooling liquid flow channel of the motor control unit MCU & MTR 1.

[0052] The low-temperature radiator LTR 23 in this embodiment is a parallel flow heat exchanger, which has a cooling liquid flow channel inside for the cooling liquid to flow, and has air flowing outside. The cooling liquid exchanges heat with the outside air by convection through the flat tube and the fin of the low-temperature radiator LTR 23, and releases heat to the outside air.

[0053] In this embodiment, the heater core HTR 24 and the cooler core Cooler 25 are also parallel flow heat exchangers. The heater core HTR 24 has a cooling liquid flow channel inside for the cooling liquid to flow, and has air flowing outside. The cooling liquid exchanges heat with the outside air by convection through the flat tube and the fin in the heater core HTR 24, and releases heat to the air in the passenger compartment, thereby achieving heating of the passenger compartment. The cooler core Cooler 25 has a cooling liquid flow channel inside for the cooling liquid to flow, and has air flowing outside. The cooling liquid exchanges heat with the outside air by convection through the flat tube and the fin in the cooler core Cooler 25, and absorbs heat from the air in the passenger compartment, thereby achieving cooling of the passenger compartment.

[0054] The automobile body is usually provided with an air conditioning box HVAC 3, which has a fan inside, and is provided with air door, dial and other adjustment structures on the box body. In this embodiment, the heater core HTR 24 and the cooler core Cooler 25 are arranged in the air conditioning box HVAC 3 of the automobile. By adjusting the inside-out circulation air door angle, temperature air door angle, mode dial position, and fan speed of the air conditioning box HVAC 3, the air supply temperature, air supply amount, and air supply mode of the passenger compartment can be adjusted to meet the thermal comfort of the occupants.

[0055] Further, the number of water pumps is 4, for the convenience of description, respectively recorded as the first electronic water pump PUMP1 261, the second electronic water pump PUMP2 262, the third electronic water pump PUMP3 263 and the fourth electronic water pump PUMP4 264. The first electronic water pump PUMP1 261 is used to pump the coolant to the water-cooled condenser LCC12, the second electronic water pump PUMP2 262 is used to pump the coolant to the cool air core Cooler25, the third electronic water pump PUMP3 263 is used to pump the coolant to the battery pack BATT2, and the fourth electronic water pump PUMP4 264 is used to pump the coolant to the motor control MCU&MTR1 and the water-cooled condenser LCC12.

[0056] Further, the coolant circulation loop further comprises a first expansion tank TANK1 121 with three liquid supplementing ports, and a second expansion tank TANK2 222 with two liquid supplementing ports. The two liquid supplementing ports of the second expansion tank TANK2 222 are respectively connected to the inlet of the first electronic water pump PUMP1 261 and the inlet of the second electronic water pump PUMP2 262. The low-temperature radiator LTR23 is connected with a liquid supplementing exhaust pipe, and the three liquid supplementing ports of the first expansion tank TANK1 121 are respectively connected to the inlet of the third electronic water pump PUMP3 263, the inlet of the fourth electronic water pump PUMP4 264 and the liquid supplementing exhaust pipe of the low-temperature radiator LTR23, which can also function as pressure equalization and exhaust.

[0057] Further, the water valve assembly comprises a first four-way water valve FWV1 271, a second four-way water valve FWV2 272, a first three-way water valve TWV1 281, a second three-way water valve TWV2 282, a third three-way water valve TWV3 283, a fourth three-way water valve TWV4 284 and a fifth three-way water valve TWV5 285. The three valve ports of the first three-way water valve TWV1 281 are respectively connected to the coolant outlet of the water-cooled condenser LCC12, the coolant inlet of the warm air core HTR24 and one of the valve ports of the fourth three-way water valve TWV4 284. The three valve ports of the second three-way water valve TWV2 282 are respectively connected to the coolant outlet of the warm air core HTR24, the inlet of the first electronic water pump PUMP1 261 and the inlet of the second electronic water pump PUMP2 262. The three valve ports of the third three-way water valve TWV3 283 are respectively connected to the coolant outlet of the chiller Chiller13, the inlet of the second electronic water pump PUMP2 262 and one of the valve ports of the first four-way water valve FWV1 271. The remaining two valve ports of the fourth three-way water valve TWV4 284 are respectively connected to the coolant outlet of the motor control MCU&MTR1 and one of the valve ports of the second four-way water valve FWV2 272. The three valve ports of the fifth three-way water valve TWV5 285 are respectively connected to the inlet of the low-temperature radiator LTR23, the outlet of the low-temperature radiator LTR23 and one of the valve ports of the first four-way water valve FWV1 271.

[0058] Furthermore, except for the two valve ports connected to the third three-way water valve TWV3283 and the fifth three-way water valve TWV5285, the remaining two valve ports of the first four-way water valve FWV1271 are connected to the inlet of the third electronic water pump PUMP3263 and one of the valve ports of the second four-way water valve FWV2, respectively. Except for the two valve ports connected to the fourth three-way water valve TWV4284 and the first four-way water valve FWV1271, the remaining two valve ports of the second four-way water valve FWV2 are connected to the coolant outlet of the battery pack BATT2 and the coolant inlet of the cooler Chiller 13, respectively.

[0059] Specifically, port 1 of the first four-way water valve FWV1271 is connected to port 4 of the second four-way water valve FWV2272, port 3 of the second four-way water valve FWV2272 is connected to port 1 of the fourth three-way water valve TWV4284, port 3 of the fourth three-way water valve TWV4284 is connected to port 3 of the first three-way water valve TWV1281, port 2 of the first three-way water valve TWV1281 is connected to the inlet of the heater core HTR24, the outlet of the heater core HTR24 is connected to port 1 of the second three-way water valve TWV2282, port 3 of the second three-way water valve TWV2282 is connected to the water inlet of the first electronic water pump PUMP1261, the water outlet of the water-cooled condenser LCC12 is connected to port 1 of the first three-way water valve TWV1281, and port 2 of the fourth three-way water valve TWV4284 is connected to the motor electronic control MC The coolant outlet of U&MTR1 is connected, port 3 of the first four-way water valve FWV1271 is connected to port 3 of the third three-way water valve TWV3283, port 1 of the third three-way water valve TWV3283 is connected to the coolant side outlet of the cooler Chiller13, port 4 of the first four-way water valve FWV1271 is connected to the water inlet of the third electronic water pump PUMP3263, the water outlet of the third electronic water pump PUMP3263 is connected to the coolant inlet of the battery BATT2, the coolant outlet of the battery BATT2 is connected to port 1 of the second four-way water valve FWV2272, port 1 of the fifth three-way water valve TWV5285 is connected to port 2 of the first four-way water valve FWV1271, and port 3 of the fifth three-way water valve TWV5285 is connected to the water inlet of the low-temperature radiator LTR23. The water outlet of the second electronic water pump PUMP2262 is connected to the water inlet of the cold air core Cooler25.

[0060] Furthermore, the coolant circulation loop also includes a first water channel tee TW1291, a second water channel tee TW2292, a third water channel tee TW3293, a fourth water channel tee TW4294 and a fifth water channel tee TW5295 for connecting pipelines. The three interfaces of the fifth water tee TW5295 are respectively connected to a valve port of the fifth three-way water valve TWV5285 (in this embodiment, the 2nd port of the fifth three-way water valve TWV5285), the outlet of the low-temperature radiator LTR23 and the inlet of the fourth electronic water pump PUMP4264; the three interfaces of the fourth water tee TW4294 are respectively connected to the outlet of the fourth electronic water pump PUMP4264, the coolant inlet of the motor electronic control MCU&MTR1 and an interface of the first water tee TW1291; the three interfaces of the third water tee TW3293 are respectively connected to a valve port of the second four-way water valve FWV2272 (in this embodiment, the 2nd port of the second four-way water valve FWV2272), the cooler The coolant inlet of Chiller13 and the coolant outlet of the cold air core Cooler25; the three interfaces of the second water channel tee TW2292 are respectively connected to one valve port of the third three-way water valve TWV3283 (in this embodiment, the 2nd port of the third three-way water valve TWV3283), one valve port of the second three-way water valve TWV2282 (in this embodiment, the 2nd port of the second three-way water valve TWV2282) and the inlet of the second electronic water pump PUMP2262; except for the interface connected to the fourth water channel tee TW4294, the remaining two interfaces of the first water channel tee TW1291 are respectively connected to the coolant inlet of the water-cooled condenser LCC12 and the outlet of the first electronic water pump PUMP1261.

[0061] The thermal management system of this embodiment can mainly realize thirteen functional modes:

[0062] In mode 1, the flow directions of the refrigerant and coolant are shown by the solid arrows in Figure 2. When the thermal management system operates in mode 1, the throttling electronic expansion valve EXV214 in the refrigerant circulation loop is throttled, and the air supply electronic expansion valve EXV215 is shut off. In the coolant circulation loop, port 2 of the first three-way water valve TWV1281 is closed, and the coolant flows from port 1 to port 3; the three valve ports of the second three-way water valve TWV2282 are all closed; the valve ports of the third three-way water valve TWV3283 are all opened, and the coolant flows from port 1 to ports 2 and 3; the valve ports of the fourth three-way water valve TWV4284 are all opened, and the coolant flows from ports 3 and 2 into port 1; port 2 of the fifth three-way water valve TWV5285 is closed, and the coolant Flows from port 1 to port 3; port 1 of the first four-way water valve FWV1271 is connected to port 2, and port 3 is connected to port 4; port 1 of the second four-way water valve FWV2272 is connected to port 2, and port 3 is connected to port 4; the first electronic water pump PUMP1261 is turned off, the second electronic water pump PUMP2262 is turned on, the third electronic water pump PUMP3263 is turned on, and the fourth electronic water pump PUMP4264 is turned on; the temperature damper in the air-conditioning box HVAC3 is adjusted to full cooling.

[0063] In the refrigerant circulation loop, the compressor COMP11 performs work on the refrigerant, and the discharged high-temperature and high-pressure refrigerant condenses and releases heat at the water-cooled condenser LCC12. The refrigerant after condensation and heat release passes through the liquid receiver dryer RD161 and the high-temperature and high-pressure side of the coaxial heat exchanger IHX162 in turn, and is then throttled at the throttling electronic expansion valve EXV214. The throttled refrigerant then evaporates and absorbs heat at the cooler Chiller13. The refrigerant after evaporation and heat absorption passes through the low-temperature and low-pressure side of the coaxial heat exchanger IHX162 and flows back to the compressor COMP11.

[0064] In the cooling liquid circulation loop, the cooling liquid is heated at the water-cooled condenser LCC12, passes through the first three-way water valve TWV1281 and the fourth three-way water valve TWV4284, mixes with the cooling liquid from the motor control MCU&MTR1 at the fourth three-way water valve TWV4284, and then passes through the second four-way water valve FWV2272, the first four-way water valve FWV1271 and the fifth three-way water valve TWV5285 in sequence to enter the low-temperature radiator LTR23. The cooling liquid is cooled in the low-temperature radiator LTR23, and then pumped out by the fourth electronic water pump PUMP4264 through the fifth waterway three-way TW5295 and the fourth waterway three-way TW4294 to flow to the motor control MCU&MTR1, thereby achieving electric drive cooling, and the other part is delivered to the water-cooled condenser LCC12 through the first waterway three-way TW1291. The cooling liquid is cooled at the chiller 13, and then divided into two parts after passing through the third three-way water valve TWV3283. One part of the cooling liquid enters the cooling core Cooler25 through the second waterway three-way TW2292 and the second electronic water pump PUMP2262, exchanges heat with the air in the passenger compartment at the cooling core Cooler25, thereby achieving passenger compartment cooling. The other part of the cooling liquid flows into the third electronic water pump PUMP3263 after passing through the first four-way water valve FWV1271, and then exchanges heat at the cooling liquid flow channel plate of the battery pack BATT2, thereby achieving battery pack BATT2 cooling. The cooled cooling liquid then passes through the second four-way water valve FWV2272, mixes with the cooling liquid flowing out of the cooling core Cooler25 at the third waterway three-way TW3293, and then flows into the chiller 13.

[0065] Therefore, under mode one operation, the temperature suitable air can be blown out to the passenger compartment by adjusting the compressor COMP11 speed, the electronic expansion valve EXV214 opening degree, the air supply amount of the air conditioning box HVAC3, the fan speed, the water valve assembly adjustment ratio and the water pump flow, the reasonable inlet water temperature and water flow flow through the battery pack cooling liquid flow channel plate, and so on. The purpose of passenger compartment cooling, battery pack BATT2 cooling by the chiller 13, and electric drive (i.e. motor control MCU&MTR1) cooling by the low-temperature radiator LTR23 is achieved.

[0066] In mode two, the flow directions of the refrigerant and the coolant are shown by the solid arrows in FIG. 3. When the thermal management system operates in mode two, the working conditions of the refrigerant circulation loop are the same as in mode one. In the coolant circulation loop, the 2nd port of the 1st three-way water valve TWV1 281 is closed, the coolant flows from the 1st port to the 3rd port; the three ports of the 2nd three-way water valve TWV2 282 are all closed; the ports of the 3rd three-way water valve TWV3 283 are all open, the coolant flows from the 1st port to the 2nd and 3rd ports; the ports of the 4th three-way water valve TWV4 284 are all open, the coolant flows from the 3rd and 2nd ports into the 1st port; the 2nd port of the 5th three-way water valve TWV5 285 is closed, the coolant flows from the 1st port to the 3rd port; the 1st four-way water valve FWV1 271 has the 1st port connected to the 4th port and the 3rd port connected to the 2nd port; the 2nd four-way water valve FWV2 272 has the 1st port connected to the 4th port and the 3rd port connected to the 2nd port; the 1st electronic water pump PUMP1 261 is closed, and the 2nd electronic water pump PUMP2 262, the 3rd electronic water pump PUMP3 263 and the 4th electronic water pump PUMP4 264 are open.

[0067] The coolant heated at the water-cooled condenser LCC 12 passes through the 1st three-way water valve TWV1 281 and the 4th three-way water valve TWV4 284, mixes with the coolant from the motor controller MCU&MTR1 at the 4th three-way water valve TWV4 284, and then passes through the 2nd four-way water valve FWV2 272, mixes with the coolant flowing out of the cooler 25 at the 3rd water passage three-way TW3 293, and then enters the chiller 13. The coolant is cooled by heat exchange at the chiller 13, and then passes through the 2nd three-way water valve TWV2 282 and is divided into two paths. One path of the coolant passes through the 2nd water passage three-way TW2 292 and the 2nd electronic water pump PUMP2 262, enters the cooler 25, and exchanges heat with the air in the passenger compartment to achieve refrigeration. The other path of the coolant passes through the 1st four-way water valve FWV1 271 and the 5th three-way water valve TWV5 285, enters the low-temperature radiator LTR2 3, and radiates heat to the outside environment. The cooled coolant passes through the 5th water passage three-way TW5 295, is pumped out by the 4th electronic water pump PUMP4 264, passes through the 4th water passage three-way TW4 294, and is transported to the motor controller MCU&MTR1 to achieve electric drive cooling. The other path of the coolant returns to the water-cooled condenser LCC 12 through the 1st water passage three-way TW1 291. The coolant flowing out of the 3rd electronic water pump PUMP3 263 is uniformly heat-exchanged at the coolant flow channel plate of the battery pack BATT2, and then passes through the 2nd four-way water valve FWV2 272 and the 1st four-way water valve FWV1 271 to flow back to the 3rd electronic water pump PUMP3 263, achieving uniform self-circulation of the battery pack BATT2.

[0068] Therefore, in mode two, by adjusting the compressor speed, the electronic expansion valve opening degree, the air conditioning box air supply, the water valve adjustment ratio, the fan speed and the water pump flow, temperature suitable air is blown out to the passenger cabin, and reasonable inlet water temperature and water flow flow through the battery pack cooling liquid flow channel plate, so that the circulation can achieve the purpose of passenger cabin refrigeration, battery uniform temperature self-circulation and electric drive cooling.

[0069] In mode three, the flow direction of the refrigerant and the cooling liquid is as shown by the solid arrows in Figure 4 the middle. When the thermal management system is running in mode three, the working condition of the refrigerant circulation loop is the same as that in mode one and mode two. In the cooling liquid circulation loop, the 2 port of the first three-way water valve TWV1 281 is closed, the cooling liquid flows from the 1 port to the 3 port; the three valve ports of the second three-way water valve TWV2 282 are all closed; the 2 port of the third three-way water valve TWV3 283 is closed, the cooling liquid flows from the 1 port to the 3 port; the valve ports of the fourth three-way water valve TWV4 284 are all open, the cooling liquid flows into the 1 port from the 3 port and the 2 port; the 2 port of the fifth three-way water valve TWV5 285 is closed, the cooling liquid flows from the 1 port to the 3 port; the 1 port and the 2 port of the first four-way water valve FWV1 271 are connected, the 3 port and the 4 port are connected; the 1 port and the 2 port of the second four-way water valve FWV2 272 are connected, the 3 port and the 4 port are connected; the first electronic water pump PUMP1 261 and the second electronic water pump PUMP2 262 are closed, the third electronic water pump PUMP3 263 and the fourth electronic water pump PUMP4 264 are open.

[0070] In mode three, the coolant is heated at the water-cooled condenser LCC12 and passes through the first three-way water valve TWV1281 and the fourth three-way water valve TWV4284, and is mixed with the coolant from the motor electronic control MCU&MTR1 at the fourth three-way water valve TWV4284. The mixed coolant then passes through the second four-way water valve FWV2272, the first four-way water valve FWV1271 and the fifth three-way water valve TWV5285 in sequence and enters the low-temperature radiator LTR23. The coolant dissipates heat to the outside at the low-temperature radiator LTR23. The coolant after heat dissipation and cooling passes through the fifth water channel tee TW5295 and is pumped out by the fourth electronic water pump PUMP4264. The pumped coolant passes through the fourth water channel tee TW4294 and is transported to the motor electronic control MCU&MTR1 for electric drive cooling. The other way flows through the first water channel tee TW1291 to the water-cooled condenser LCC12. The coolant is cooled at the cooler Chiller13, and the cooled coolant flows into the third electronic water pump PUMP3263 after passing through the third three-way water valve TWV3283 and the first four-way water valve FWV1271. The coolant flowing out of the third electronic water pump PUMP3263 exchanges heat at the coolant flow channel plate of the battery pack BATT2 to achieve battery cooling. The coolant after heat exchange passes through the second four-way water valve FWV2272 and the third water channel tee TW3293 and flows into the cooler Chiller13.

[0071] Therefore, in mode three, by adjusting the compressor speed, the opening of the throttling electronic expansion valve, the water valve adjustment ratio, the fan speed and the water pump flow, a reasonable inlet water temperature and water flow will flow through the battery pack coolant flow plate. This cycle can achieve the purpose of cooling the battery separately through the cooler Chiller13.

[0072] In mode 4, the refrigerant and coolant flow as follows Figure 5 As shown by the solid arrow in the middle, when the thermal management system operates in mode 4, the refrigerant circulation circuit does not work and the air conditioning box HVAC3 does not work. In the coolant circulation loop, port 2 of the first three-way water valve TWV1281 is closed, and the coolant flows from port 1 to port 3; all three valve ports of the second three-way water valve TWV2282 are closed; port 2 of the third three-way water valve TWV3283 is closed, and the coolant flows from port 1 to port 3; port 2 of the fourth three-way water valve TWV4284 is closed, and the coolant flows from port 3 to port 1; port 2 of the fifth three-way water valve TWV5285 is closed, and the coolant flows from port 1 to port 3; port 1 of the first four-way water valve FWV1271 is connected to port 2, and port 3 is connected to port 4; port 1 of the second four-way water valve FWV2272 is connected to port 4, and port 3 is connected to port 2; the first electronic water pump PUMP1261 and the second electronic water pump PUMP2262 are closed, and the third electronic water pump PUMP3263 and the fourth electronic water pump PUMP4264 are turned on.

[0073] The coolant flows out from the water-cooled condenser LCC12 and passes through the first three-way water valve TWV1281, the fourth three-way water valve TWV4284, the second four-way water valve FWV2272 and the third water tee TW3293 before flowing into the cooler Chiller13. The coolant does not exchange heat in the water-cooled condenser LCC12 and the cooler Chiller13. The coolant flowing out of the cooler Chiller13 passes through the third three-way water valve TWV3283 and the first four-way water valve FWV1271 in sequence and then flows into the third electronic water pump PUMP3263. The coolant pumped out from the third electronic water pump PUMP3263 exchanges heat at the coolant flow plate of the battery pack BATT2. The coolant after heat exchange passes through the second four-way water valve FWV2272, the first four-way water valve FWV1271 and the fifth three-way water valve TWV5285 in sequence and then enters the low-temperature radiator LTR23. The coolant dissipates heat to the outside at the low-temperature radiator LTR23. The coolant after heat dissipation passes through the fifth water channel TW5295 and is pumped out by the fourth electronic water pump PUMP4264. The pumped coolant passes through the fourth water channel TW4294 and the first water channel TW1291 in sequence and is transported to the water-cooled condenser LCC12.

[0074] Therefore, by adjusting the water valve ratio, fan speed and water pump flow, a reasonable inlet water temperature and water flow will flow through the battery pack coolant flow channel plate, and the cycle will be repeated to achieve the purpose of cooling the battery separately through the low-temperature radiator LTR23.

[0075] In mode 5, the refrigerant and coolant flow directions are as follows Figure 6 As shown by the solid arrows, when the thermal management system operates in Mode 5, the throttling electronic expansion valve EXV214 and the air supply electronic expansion valve EXV215 in the refrigerant circulation circuit are throttled. Compressor COMP11 performs work on the refrigerant, and the discharged high-temperature, high-pressure refrigerant is split into two paths. One path flows directly to the air supply electronic expansion valve EXV215 for throttling. The other path condenses and releases heat in the water-cooled condenser LCC12. The condensed and heat-released refrigerant then passes through the liquid receiver-dryer RD161 and the high-temperature, high-pressure side of the coaxial heat exchanger IHX162. It is then throttled by the throttling electronic expansion valve EXV214. The throttled refrigerant then evaporates and absorbs heat in the chiller 13. After evaporation and heat absorption, the refrigerant passes through the low-temperature, low-pressure side of the coaxial heat exchanger IHX162, mixes with the refrigerant throttled by the air supply electronic expansion valve EXV215, and then flows back to compressor COMP11.

[0076] In the cooling liquid circulation loop, the three ports of the first three-way water valve TWV1 281 are all open, the cooling liquid flows from port 1 to ports 2 and 3; the three ports of the second three-way water valve TWV2 282 are all open, the cooling liquid flows from port 1 to ports 2 and 3; the 2 port of the third three-way water valve TWV3 283 is closed, the cooling liquid flows from port 1 to port 3; the three ports of the fourth three-way water valve TWV4 284 are all open, the cooling liquid flows from ports 2 and 3 into port 1; the 2 port of the fifth three-way water valve TWV5 285 is closed, the cooling liquid flows from port 1 to port 3; the 1 port of the first four-way water valve FWV1 271 is connected to the 4 port, the 2 port is connected to the 3 port; the 1 port of the second four-way water valve FWV2 272 is connected to the 2 port, the 3 port is connected to the 4 port; the first electronic water pump PUMP1 261, the second electronic water pump PUMP2 262, the third electronic water pump PUMP3 263 and the fourth electronic water pump PUMP4 264 are all open. The temperature damper in the air conditioning box HVAC3 is adjusted to full heat.

[0077] The cooling liquid is heated at the water-cooled condenser LCC12, and then passes through the first three-way water valve TWV1281. The cooling liquid is divided into two paths at the outlet of the first three-way water valve TWV1281. One path of the cooling liquid flows into the heating core HTR24, and the cooling liquid is cooled at the heating core HTR24 to heat the passenger compartment. The other path of the cooling liquid goes to the fourth three-way water valve TWV4284. The cooling liquid flows out of the heating core HTR24, and then flows to the second three-way water valve TWV2282. The cooling liquid is divided into two paths at the second three-way water valve TWV2282. One path of the cooling liquid flows back to the LCC12 through the first electronic water pump PUMP1261 and the first water three-way TW1291. The other path of the cooling liquid flows out of the second three-way water valve TWV2282, and then enters the cooling core Cooler25 to continue to be cooled. The other path of the cooling liquid from the first three-way water valve TWV1281 mixes with the cooling liquid from the motor control MCU&MTR1 at the fourth three-way water valve TWV4284. The mixed cooling liquid passes through the second four-way water valve FWV2272, the first four-way water valve FWV1271 and the third electronic water pump PUMP3263 in sequence, and is cooled at the battery pack BATT2 cooling liquid flow channel plate. The cooled cooling liquid passes through the second four-way water valve FWV2272, and mixes with the cooling liquid from the cooling core Cooler25 at the third water three-way TW3293. The mixed cooling liquid flows into the chiller Chiller13, and is cooled at the chiller Chiller13. The cooled cooling liquid passes through the third three-way water valve TWV3283, the first four-way water valve FWV1271 and the fifth three-way water valve TWV5285 in sequence, and enters the low-temperature radiator LTR23. The cooling liquid is cooled to the outside at the low-temperature radiator LTR23. The cooled cooling liquid passes through the fifth water three-way TW5295, and is pumped out by the fourth electronic water pump PUMP4264. The pumped-out cooling liquid passes through the fourth water three-way TW4294, and is sent to the motor control MCU&MTR1 in one path, and is sent to the water-cooled condenser LCC12 through the first water three-way TW1291 in the other path. The air with a lower temperature in the passenger compartment is sucked by the air conditioning box HVAC3, flows through the cooling core Cooler25, is heated for the first time, and then is continuously heated at the heating core HTR24. The air with a higher temperature is finally blown out to the passenger compartment. The air with a suitable temperature is blown out to the passenger compartment by adjusting the compressor speed, the opening degree of the throttling electronic expansion valve, the opening degree of the air supplementing electronic expansion valve, the air supply of the air conditioning box, the water valve adjustment ratio and the water pump flow. The reasonable inlet water temperature and water flow rate flow through the battery pack cooling liquid flow channel plate, and the cycle is achieved. The purpose of heating the passenger compartment and the battery by the heat pump, absorbing the outside heat by the chiller13 and heating by the electric drive is achieved.

[0078] In mode six, the flow directions of the refrigerant and the cooling liquid are as follows Figure 7The fourth three-way water valve TWV4284 in the cooling liquid circulation loop is closed at two ports, i.e. the cooling liquid does not absorb the heat generated by the motor control unit MCU & MTR1, and the rest of the structure works in the same way as in mode five.

[0079] The cooling liquid cooled at the low-temperature radiator LTR23 is pumped out by the fifth water pump PUMP4264 through the fifth water three-way TW5295, and then sequentially passes through the fourth water three-way TW4294 and the first water three-way TW1291 to be delivered to the water-cooled condenser LCC12, without flowing into the motor control unit MCU & MTR1. Therefore, in mode six, by adjusting the compressor speed, the opening degree of the throttling electronic expansion valve, the opening degree of the supercharging electronic expansion valve, the air supply of the air conditioning box, the water valve adjustment ratio, and the water pump flow rate, the temperature-appropriate air is blown out to the passenger compartment, and the reasonable inlet water temperature and water flow rate flow through the battery pack cooling liquid flow channel plate, so as to achieve the purpose of heating the passenger compartment and the battery by the heat pump, and absorbing the external heat by the Chiller13.

[0080] In mode seven, the flow directions of the refrigerant and the cooling liquid are as shown by the solid arrows. Figure 8 The working condition of the refrigerant circulation loop of the thermal management system in mode seven is the same as that in modes five and six. Compared with mode five, in mode seven, the second four-way water valve FWV2272 in the cooling liquid circulation loop is connected at one port and four ports, and at three ports and two ports, i.e. the cooling liquid heated at the water-cooled condenser LCC12 only flows to the heating core HTR24 to heat the passenger compartment, without flowing into the battery pack BATT2 to heat the battery pack BATT2; the rest of the structure works in the same way.

[0081] The cooling liquid from the first three-way water valve TWV 1281 is mixed with the cooling liquid from the motor control unit MCU & MTR 1 at the fourth three-way water valve TWV 4284, then passes through the second four-way water valve FWV 2272, and is mixed with the cooling liquid from the cooler 25 at the third waterway three-way TW 3293, and then flows into the chiller 13. The cooling liquid from the third electronic water pump PUMP 3263 is uniformly heat-exchanged at the battery pack BATT 2 cooling liquid flow channel plate, and then flows back to the third electronic water pump PUMP 3263 in sequence through the second four-way water valve FWV 2272 and the first four-way water valve FWV 1271, realizing the uniform temperature self-circulation of the battery. Therefore, in mode seven, by adjusting the compressor speed, the opening degree of the throttling electronic expansion valve, the opening degree of the supercharging electronic expansion valve, the air supply of the air conditioning box, the water valve adjustment ratio, and the water pump flow, the temperature suitable air is blown out to the passenger cabin, and the reasonable inlet water temperature and water flow pass through the battery pack cooling liquid flow channel plate, so as to achieve the purpose of heating the passenger cabin by the heat pump and absorbing the external heat by the chiller 13.

[0082] In mode eight, the flow directions of the refrigerant and the cooling liquid are as shown by the solid arrows in Figure 9 The heat management system operates in mode eight, and the working condition of the refrigerant circulation loop is the same as that in modes five to seven. Compared with mode seven, the second port of the fourth three-way water valve TWV 4284 in the cooling liquid circulation loop is closed, that is, the electric drive heat at the motor control unit MCU & MTR 1 is not absorbed; the working conditions of the remaining structures are the same.

[0083] The cooling liquid cooled at the low-temperature radiator LTR 23 is pumped out by the fourth electronic water pump PUMP 4264 through the fifth waterway three-way TW 5295, and then passes through the fourth waterway three-way TW 4294 and the first waterway three-way TW 1291, and is all delivered to the water-cooled condenser LCC 12 without being branched to the motor control unit MCU & MTR 1. Therefore, in mode eight, by adjusting the compressor speed, the opening degree of the throttling electronic expansion valve, the opening degree of the supercharging electronic expansion valve, the air supply of the air conditioning box, the water valve adjustment ratio, and the water pump flow, the temperature suitable air is blown out to the passenger cabin, and the reasonable inlet water temperature and water flow pass through the battery pack cooling liquid flow channel plate, so as to achieve the purpose of heating the passenger cabin by the heat pump and absorbing the external heat by the chiller 13.

[0084] In mode nine, the flow directions of the refrigerant and the cooling liquid are as shown by the solid arrows in Figure 10The flow direction of the refrigerant and the coolant in Mode Nine is shown by the solid arrows. When the thermal management system operates in Mode Nine, the working condition of the refrigerant circulation loop is the same as that in Modes Five to Eight. Compared with Mode Seven, the 3 ports of the fifth three-way water valve TWV5285 in the coolant circulation loop are closed, i.e., the coolant does not exchange heat with the outside through the low-temperature radiator LTR23; the working conditions of the remaining structures are the same.

[0085] After the coolant is cooled at the chiller Chiller13, it is sequentially pumped out by the fourth electronic water pump PUMP4264 through the third three-way water valve TWV3283, the first four-way water valve FWV1271, the fifth three-way water valve TWV5285, and the fifth waterway three-way TW5295. The coolant is then delivered to the motor control unit MCU&MTR1 and the water-cooled condenser LCC12 through the fourth waterway three-way TW4294 and the first waterway three-way TW1291, respectively. Therefore, in Mode Nine, by adjusting the compressor speed, the opening degree of the throttling electronic expansion valve, the opening degree of the supercharging electronic expansion valve, the air supply of the air conditioning box, the water valve adjustment ratio, and the water pump flow rate, the temperature-appropriate air is blown out to the passenger compartment, and the reasonable inlet water temperature and water flow rate flow through the battery pack coolant flow channel plate, so as to achieve the purposes of heating the passenger compartment by the heat pump and absorbing the electric drive heat by the Chiller13.

[0086] In Mode Ten, the flow direction of the refrigerant and the coolant is shown by the solid arrows. Figure 11 When the thermal management system operates in Mode Ten, the working condition of the refrigerant circulation loop is the same as that in Modes Five to Nine. In the coolant circulation loop, the valve ports of the first three-way water valve TWV1281 are all open, and the coolant flows from port 1 to ports 2 and 3; the 2 port of the second three-way water valve TWV2282 is closed, and the coolant flows from port 1 to port 3; the valve ports of the third three-way water valve TWV3283 are all open, and the coolant flows from port 1 to ports 2 and 3; the valve ports of the fourth three-way water valve TWV4284 are all open, and the coolant flows from ports 2 and 3 into port 1; the 3 port of the fifth three-way water valve TWV5285 is closed, and the coolant flows from port 1 to port 2; the 1 port of the first four-way water valve FWV1271 is connected to the 4 port, and the 3 port is connected to the 2 port; the 1 port of the second four-way water valve FWV2272 is connected to the 2 port, and the 3 port is connected to the 4 port; and the first electronic water pump PUMP1261, the second electronic water pump PUMP2262, the third electronic water pump PUMP3263, and the fourth electronic water pump PUMP4264 are all open. The temperature damper in the air conditioning box HVAC3 is adjusted to a cold-heat mixture.

[0087] The cooling liquid is heated at the water-cooled condenser LCC12, passes through the first three-way water valve TWV1281, and is divided into two paths at the outlet of the first three-way water valve TWV1281. One path of the cooling liquid flows into the heating core HTR24, and the cooling liquid releases heat at the heating core HTR24 to heat the passenger compartment. The cooling liquid flows out of the heating core HTR24, passes through the second three-way water valve TWV2282, the first electronic water pump PUMP1261, and the first water route three-way TW1291 in sequence, and then flows back to the LCC12. The other path of the cooling liquid is mixed with the cooling liquid from the motor control unit MCU&MTR1 at the fourth three-way water valve TWV4284. The mixed cooling liquid passes through the second four-way water valve FWV2272, the first four-way water valve FWV1271, and the third electronic water pump PUMP3263 in sequence, exchanges heat at the battery pack BATT2 cooling liquid flow channel plate, and then passes through the second four-way water valve FWV2272. The cooling liquid is mixed with the cooling liquid flowing out of the cooling core Cooler25 at the third water route three-way TW3293, flows into the chiller Chiller13, is cooled at the chiller Chiller13, and is divided into two paths after passing through the third three-way water valve TWV3283. One path of the cooling liquid passes through the first four-way water valve FWV1271, the fifth three-way water valve TWV5285, and the fifth water route three-way TW5295 in sequence, is pumped out by the fourth electronic water pump PUMP4264, and is then delivered to the motor control unit MCU&MTR1 and the water-cooled condenser LCC12 through the fourth water route three-way TW4294 and the first water route three-way TW1291, respectively. The other path of the cooling liquid flows out of the third three-way water valve TWV3283, passes through the second water route three-way TW2292, and is pumped into the cooling core Cooler25 by the second electronic water pump PUMP2262. The air conditioner box HVAC3 sucks the high-humidity air in the passenger compartment, and the air flows through the cooling core Cooler25. The cooled and dehumidified air is heated at the heating core HTR24, and finally the low-humidity air is blown out to the passenger compartment. Therefore, in mode ten, the temperature-appropriate air is blown out to the passenger compartment by adjusting the compressor speed, the opening degree of the throttling electronic expansion valve, the opening degree of the air supplementing electronic expansion valve, the air supply of the air conditioner box, the water valve adjustment ratio, and the water pump flow rate. The reasonable inlet water temperature and water flow rate flow through the battery pack cooling liquid flow channel plate, and the cycle is achieved to dehumidify the passenger compartment, heat the passenger compartment, heat the battery, and absorb the electric drive heat of the chiller Chiller13.

[0088] In mode ten, the flow directions of the refrigerant and the cooling liquid are as follows Figure 12The coolant circulates through the coolant circulation loop as indicated by the dashed arrows. The heat management system operates in Mode 11 in the same manner as Mode 10. The first three-way water valve TWV1 281 has its 3 port closed and the coolant flows from port 1 to port 2; the second three-way water valve TWV2 282 has its 2 port closed and the coolant flows from port 1 to port 3; the third three-way water valve TWV3 283 has its 1 port closed and the coolant flows from port 2 to port 3; the fourth three-way water valve TWV4 284 has its 3 port closed and the coolant flows from port 2 to port 1; the fifth three-way water valve TWV5 285 has its 3 port closed and the coolant flows from port 1 to port 2; the first four-way water valve FWV1 271 has its 1 port connected to its 2 port and its 3 port connected to its 4 port; the second four-way water valve FWV2 272 has its 1 port connected to its 2 port and its 3 port connected to its 4 port; the first electronic water pump PUMP1 261, the second electronic water pump PUMP2 262, the third electronic water pump PUMP3 263, and the fourth electronic water pump PUMP4 264 are all turned on. The temperature damper in the air conditioning box HVAC3 is set to cold.

[0089] After being heated at the water-cooled condenser LCC12, the coolant flows into the heater core HTR24 through the first three-way water valve TWV1281. The coolant releases heat at the heater core HTR24. After flowing out of the heater core HTR24, the coolant flows through the second three-way water valve TWV2282, the first electronic water pump PUMP1261 and the first water channel tee TW1291 in turn before flowing back to LCC12. The coolant from the motor electronic control MCU&MTR1 flows out from the fourth three-way water valve TWV4284 and then passes through the second four-way water valve FWV2272, the first four-way water valve FWV1271, the fifth three-way water valve TWV5285, and the fifth water channel tee TW5295 in sequence and is pumped out by the fourth electronic water pump PUMP4264. The coolant pumped out by the fourth electronic water pump PUMP4264 passes through the fourth water channel tee TW4294 and is transported back to the motor electronic control MCU&MTR1. The other way passes through the first water channel tee TW1291 and merges with the coolant from the heater core HTR24 and then flows to the water-cooled condenser LCC12. After being cooled at the cooler Chiller13, the coolant is divided into two paths at the third three-way water valve TWV3283. One path of coolant passes through the second water channel TW2292 and the second electronic water pump PUMP2262 in sequence and then flows into the cold air core Cooler25, and the coolant exchanges heat at the cold air core Cooler25; the other path of coolant flows out of the third three-way water valve TWV3283, passes through the first four-way water valve FWV1271 and is pumped into the coolant flow plate of the battery pack BATT2 by the third electronic water pump PUMP3263, absorbs battery heat at the coolant flow plate of the battery pack BATT2, and the coolant after absorbing heat passes through the second four-way water valve FWV2272, mixes with the coolant flowing out of the cold air core Cooler25 at the third water channel TW3293 and then flows into the cooler Chiller13. In mode 11, by adjusting the compressor speed, the opening of the throttling electronic expansion valve, the opening of the air-supply electronic expansion valve, the air supply volume of the air-conditioning box, the water valve adjustment ratio and the water pump flow, air with suitable temperature is blown into the passenger compartment. Reasonable inlet water temperature and water flow flow through the battery pack coolant flow channel plate. This cycle can achieve the purpose of dehumidification of the passenger compartment, cooler Chiller13 absorbing battery heat, and electric drive self-circulation / heat storage.

[0090] In mode 12, the flow direction of refrigerant and coolant is as follows Figure 13As shown by the solid arrow in the middle. When the thermal management system operates in mode 12, the working conditions of the refrigerant circulation circuit are the same as those in modes 1 to 3. In the coolant circulation circuit, the valve ports of the first three-way water valve TWV1281 are all open, and the coolant flows from port 1 to ports 2 and 3; the port 2 of the second three-way water valve TWV2282 is closed, and the coolant flows from port 1 to port 3; the valve ports of the third three-way water valve TWV3283 are all open, and the coolant flows from port 1 to ports 2 and 3; the valve ports of the fourth three-way water valve TWV4284 are all open, and the coolant flows from ports 2 and 3 into port 1; the valve ports of the fifth three-way water valve TWV Close port 2 of water valve TWV5285, allowing coolant to flow from port 1 to port 3. Connect port 1 of the first four-way water valve FWV1271 to port 4, and port 2 to port 3. Connect port 1 of the second four-way water valve FWV2272 to port 4, and port 2 to port 3. All three electronic water pumps, PUMP1261, PUMP2262, PUMP3263, and PUMP4264, are turned on. Set the temperature damper in HVAC3 to mixed cooling and heating.

[0091] In mode 12, the coolant is heated at the water-cooled condenser LCC12 and passes through the first three-way water valve TWV1281. The outlet of the first three-way water valve TWV1281 is divided into two paths. One path of coolant flows into the heater core HTR24, where the coolant releases heat. After flowing out of the heater core HTR24, the coolant flows through the second three-way water valve TWV2282, the first electronic water pump PUMP1261 and the first water channel tee TW1291 in sequence before flowing back to LCC12; the other path of coolant branched from the first three-way water valve TWV1281 is mixed with the coolant from the motor electronic control MCU&MTR1 at the fourth three-way water valve TWV4284, and the mixed coolant passes through the second four-way water valve FWV2272, and is mixed with the coolant flowing out of the cold air core Cooler 25 at the third water channel tee TW3293 before flowing into the cooler Chiller13. The coolant is cooled at the cooler Chiller13 and then divided into two paths after passing through the third three-way water valve TWV3283. One path of coolant passes through the second water channel TW2292 and the second electronic water pump PUMP2262 and enters the cold air core Cooler25, where the coolant exchanges heat with the air in the passenger compartment. The other path of coolant passes through the first four-way water valve FWV1271 and the fifth three-way water valve TWV5285 in sequence and enters the low-temperature radiator LTR23. After absorbing external heat at the low-temperature radiator LTR23, the coolant passes through the fifth water channel TW5295 and is pumped out by the fourth electronic water pump PUMP4264. The pumped coolant passes through the fourth water channel TW4294 and is transported to the motor electronic control MCU&MTR1. The other path flows through the first water channel TW1291 to the water-cooled condenser LCC12. The coolant pumped out from the third electronic water pump PUMP3263 undergoes uniform temperature heat exchange at the battery pack BATT2 coolant flow channel plate. After uniform temperature heat exchange, the coolant then flows back to the third electronic water pump PUMP3263 through the second four-way water valve FWV2272 and the first four-way water valve FWV1271, achieving uniform temperature self-circulation of the battery. Therefore, in mode 12, by adjusting the compressor speed, the opening of the throttling electronic expansion valve, the air supply volume of the air conditioning box, the water valve adjustment ratio, and the water pump flow rate, air with a suitable temperature is blown out to the passenger compartment. A reasonable inlet water temperature and water flow flow through the battery pack coolant flow channel plate. This cycle can achieve the purpose of dehumidifying the passenger compartment, absorbing electric drive heat and external heat by the cooler Chiller13, and achieving uniform temperature self-circulation of the battery.

[0092] In mode 13, the refrigerant and coolant flow directions are as follows Figure 14As shown by the solid arrow in the middle. When the thermal management system operates in mode 13, the working conditions of the refrigerant circulation circuit are the same as those in mode 12. In the coolant circulation circuit, the valve ports of the first three-way water valve TWV1281 are all open, and the coolant flows from port 1 to ports 2 and 3; the valve ports of the second three-way water valve TWV2282 are closed, and the coolant flows from port 1 to port 3; the valve ports of the third three-way water valve TWV3283 are all open, and the coolant flows from port 1 to ports 2 and 3; the valve ports of the fourth three-way water valve TWV4284 are all open, and the coolant flows from ports 2 and 3 into port 1; the valve ports of the fifth three-way water valve TWV Close port 2 of water valve TWV5285, allowing coolant to flow from port 1 to port 3. Connect port 1 of the first four-way water valve FWV1271 to port 2, and port 3 to port 4. Connect port 1 of the second four-way water valve FWV2272 to port 2, and port 3 to port 4. All three electronic water pumps, PUMP1261, PUMP2262, PUMP3263, and PUMP4264, are turned on. Set the temperature damper in HVAC3 to mixed cooling and heating.

[0093] In mode thirteen, the coolant is heated at the water-cooled condenser LCC12 and passes through the first three-way water valve TWV1281. At the outlet of the first three-way water valve TWV1281, it is divided into two paths. One path of coolant flows into the heater core HTR24, and the coolant releases heat at the heater core HTR24. After flowing out of the heater core HTR24, the coolant flows through the second three-way water valve TWV2282, the first electronic water pump PUMP1261 and the first water channel three-way TW1291 in sequence and then flows back to LCC12; the other path of coolant branched off from the first three-way water valve TWV1281 is connected to the fourth three-way water valve TWV4284 by the coolant from the heater core HTR24. The coolant of the motor electronic control MCU&MTR1 is mixed, and the mixed coolant passes through the second four-way water valve FWV2272, the first four-way water valve FWV1271, and the fifth three-way water valve TWV5285 in sequence and then enters the low-temperature radiator LTR23. The coolant dissipates heat to the outside and is cooled at the low-temperature radiator LTR23. After that, it is pumped out by the fourth electronic water pump PUMP4264 through the fifth water channel tee TW5295. The pumped coolant passes through the fourth water channel tee TW4294 and is transported to the motor electronic control MCU&MTR1 in one way, and the other way flows to the water-cooled condenser LCC12 through the first water channel tee TW1291. The coolant is cooled at the cooler Chiller13, and the cooled coolant is divided into two paths after passing through the third three-way water valve TWV3283. One path of coolant passes through the second water channel tee TW2292 and the second electronic water pump PUMP2262 and enters the cold air core Cooler25, and the coolant exchanges heat with the air in the passenger compartment at the cold air core Cooler25; the other path of coolant passes through the first four-way water valve FWV1271 and flows into the third electronic water pump PUMP3263. The coolant pumped out from the third electronic water pump PUMP3263 exchanges heat at the coolant flow plate of the battery pack BATT2. The coolant after heat exchange passes through the second four-way water valve FWV2272 and mixes with the coolant flowing out of the cold air core Cooler25 at the third water channel tee TW3293. The mixed coolant flows back to the cooler Chiller13. Therefore, in mode 13, by adjusting the compressor speed, the opening of the throttling electronic expansion valve, the air supply volume of the air-conditioning box, the water valve adjustment ratio and the water pump flow rate, air with suitable temperature is blown into the passenger compartment. Reasonable inlet water temperature and water flow flow through the battery pack coolant flow channel plate. Such a cycle can achieve the purpose of dehumidifying the passenger compartment, cooling the battery by the cooler Chiller13, and cooling the electric drive by the low-temperature radiator LTR23.

[0094] In summary, the automotive thermal management system of the present invention simplifies the refrigerant circulation loop and uses a multi-way valve for the coolant circulation loop, which can not only realize a variety of system functional modes, but also make the system structure more integrated and modular. After integration and modularization, the number and length of pipes in the system refrigerant circulation loop are reduced, the resistance of the refrigerant circuit is reduced, and the performance is improved; at the same time, after integration and modularization, the weight and volume of the thermal management system are reduced, and the heat exchange per unit weight and unit volume are increased, which improves the endurance of the entire vehicle. In addition, the condensation and evaporation in the refrigerant circulation loop are both indirectly exchanged by compact and efficient plate heat exchangers. The system has a small refrigerant charge, and the initial investment and subsequent maintenance costs are low; the refrigerant does not enter the passenger compartment, which improves safety; it is compatible with low-GWP flammable refrigerants such as R1234yf and R290, which is more environmentally friendly.

[0095] Typical heat pump systems are equipped with an outdoor heat exchanger. When the system operates for extended periods in low-temperature, high-humidity environments, the outdoor heat exchanger is prone to frost and ice formation, reducing the system's heating performance. Furthermore, air-source-based thermal management systems have relatively short defrost cycles on the external heat exchanger, resulting in frequent defrosting and large fluctuations in passenger compartment air temperature. This compromises passenger compartment thermal comfort in low-temperature environments. Activating a high-pressure water heater or air heater in these situations increases system power consumption. The need for an external heat exchanger in the front-end module increases the number of components and the design and matching workload. The automotive thermal management system of the present invention, however, utilizes a non-air-source heat pump design without an external heat exchanger. It uses water as the heat source and a low-temperature radiator for heat exchange with the outside world. This reduces the number of front-end module components, reduces the design and matching workload, and allows for greater freedom in vehicle front-end styling. Furthermore, the use of a low-temperature radiator instead of an external heat exchanger prevents the passenger compartment heating effect from being affected by frost on the external heat exchanger in low-temperature environments, ensuring passenger comfort.

[0096] The automotive thermal management system of this invention recycles waste heat from the motor, electronic control, and battery through the circulation of coolant, helping to improve the vehicle's energy efficiency and endurance. It can meet the functional requirements of various vehicle usage scenarios, including driving, idling, charging, and cabin preheating, in high, medium, and low ambient temperatures, and has high application value.

[0097] The above embodiments are preferred examples of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. An automotive thermal management system, characterized in that: It includes a refrigerant circulation circuit and a coolant circulation circuit, wherein: The refrigerant circulation loop includes a compressor COMP, a water-cooled condenser LCC, a cooler Chiller, a throttling electronic expansion valve EXV2, an air-supply electronic expansion valve EXV1, a liquid storage dryer RD and a coaxial heat exchanger IHX connected by several pipes. The exhaust port of the compressor COMP is connected to the refrigerant inlet of the water-cooled condenser LCC, the refrigerant outlet of the water-cooled condenser LCC is connected to the inlet of the liquid storage dryer RD, the outlet of the liquid storage dryer RD is connected to the high-pressure side inlet of the coaxial heat exchanger IHX, the high-pressure side outlet of the coaxial heat exchanger IHX is connected to the refrigerant inlet of the cooler Chiller through the throttling electronic expansion valve EXV2, the refrigerant outlet of the cooler Chiller is connected to the low-pressure side inlet of the coaxial heat exchanger IHX, the low-pressure side outlet of the coaxial heat exchanger IHX is connected to the intake port of the compressor COMP, and the air-supply electronic expansion valve EXV1 is connected in parallel at both ends of the compressor COMP. The coolant circulation loop exchanges heat with the refrigerant circulation loop through the chiller, the water-cooled condenser LCC; The refrigerant circulation circuit further includes a temperature sensor T, a first temperature and pressure sensor PT1 and a second temperature and pressure sensor PT2. The temperature sensor T is arranged on the pipeline from the exhaust port of the compressor COMP to the refrigerant inlet of the water-cooled condenser LCC. The first temperature and pressure sensor PT1 is arranged on the pipeline from the refrigerant outlet of the water-cooled condenser LCC to the inlet of the liquid receiver dryer RD. The second temperature and pressure sensor PT2 is arranged on the pipeline from the refrigerant outlet of the cooler Chiller to the low-pressure side inlet of the coaxial heat exchanger IHX; The coolant circulation loop includes a low-temperature radiator LTR, a motor electronic control MCU & MTR, a battery pack BATT, a heater core HTR, a cooler core Cooler, several water pumps and a water valve assembly connected by several pipes; The number of the water pumps is 4, namely the first electronic water pump PUMP1, the second electronic water pump PUMP2, the third electronic water pump PUMP3 and the fourth electronic water pump PUMP4. The first electronic water pump PUMP1 is used to pump coolant to the water-cooled condenser LCC. The second electronic water pump PUMP2 is used to pump coolant to the cooling core Cooler. The third electronic water pump PUMP3 is used to pump coolant to the battery pack BATT. The fourth electronic water pump PUMP4 is used to pump coolant to the motor electronic control MCU&MTR and the water-cooled condenser LCC; The coolant circulation loop also includes a first expansion tank TANK1 with three liquid replenishing ports and a second expansion tank TANK2 with two liquid replenishing ports. The low temperature radiator LTR is connected to a liquid replenishment exhaust pipe. The three liquid filling ports of the first expansion tank TANK1 are respectively connected to the inlet of the third electronic water pump PUMP3, the inlet of the fourth electronic water pump PUMP4 and the liquid filling exhaust pipe on the low-temperature radiator LTR; The two liquid replenishing ports of the second expansion tank TANK2 are respectively connected to the inlet of the first electronic water pump PUMP1 and the inlet of the second electronic water pump PUMP2.

2. The automotive thermal management system according to claim 1, characterized in that: in, The water-cooled condenser LCC and the cooler Chiller are both plate heat exchangers.

3. The automotive thermal management system according to claim 1, wherein: in, The liquid receiver dryer RD is integrated with the coaxial heat exchanger IHX.

4. The automotive thermal management system according to claim 1, characterized in that: in, The water valve assembly includes a first four-way water valve FWV1, a second four-way water valve FWV2, a first three-way water valve TWV1, a second three-way water valve TWV2, ​​a third three-way water valve TWV3, a fourth three-way water valve TW4 and a fifth three-way water valve TWV5. The three valve ports of the first three-way water valve TWV1 are respectively connected to the coolant outlet of the water-cooled condenser LCC, the coolant inlet of the heater core HTR, and one valve port of the fourth three-way water valve TW4. The three valve ports of the second three-way water valve TWV2 are respectively connected to the coolant outlet of the heater core HTR, the inlet of the first electronic water pump PUMP1 and the inlet of the second electronic water pump PUMP2. The three valve ports of the third three-way water valve TWV3 are respectively connected to the coolant outlet of the chiller, the inlet of the second electronic water pump PUMP2 and one valve port of the first four-way water valve FWV1. The remaining two valve ports of the fourth three-way water valve TW4 are connected to the coolant outlet of the motor electronic control MCU&MTR and one valve port of the second four-way water valve FWV2 respectively. The three valve ports of the fifth three-way water valve TWV5 are respectively connected to the inlet of the low-temperature radiator LTR, the outlet of the low-temperature radiator LTR, and one valve port of the first four-way water valve FWV1.

5. The automotive thermal management system according to claim 4, characterized in that: in, The other two valve ports of the first four-way water valve FWV1 are connected to the inlet of the third electronic water pump PUMP3 and one valve port of the second four-way water valve FWV2 respectively. The remaining two valve ports of the second four-way water valve FWV2 are respectively connected to the coolant outlet of the battery pack BATT and the coolant inlet of the cooler Chiller.

6. The automotive thermal management system according to claim 5, characterized in that: in, The coolant circulation loop also includes a first water channel tee TW1, a second water channel tee TW2, a third water channel tee TW3, a fourth water channel tee TW4 and a fifth water channel tee TW5 for connecting pipelines. The three interfaces of the fifth water channel TW5 are respectively connected to a valve port of the fifth three-way water valve TWV5, the outlet of the low-temperature radiator LTR and the inlet of the fourth electronic water pump PUMP4; The three interfaces of the fourth water channel tee TW4 are respectively connected to the outlet of the fourth electronic water pump PUMP4, the coolant inlet of the motor electronic control MCU / MTR and one interface of the first water channel tee TW1; The three interfaces of the third water channel TW3 are respectively connected to a valve port of the second four-way water valve FWV2, the coolant inlet of the chiller, and the coolant outlet of the cooler; The three interfaces of the second water channel TW2 are respectively connected to a valve port of the third three-way water valve TWV3, a valve port of the second three-way water valve TWV2 and the inlet of the second electronic water pump PUMP2; The other two interfaces of the first water channel tee TW1 are respectively connected to the coolant inlet of the water-cooled condenser LCC and the outlet of the first electronic water pump PUMP1.

Images