New energy automobile integrated heat pump air conditioning system with battery waste heat recovery function and control method of new energy automobile integrated heat pump air conditioning system

Abstract

The invention discloses a new energy automobile integrated heat pump air conditioning system with a battery waste heat recovery function. The new energy automobile integrated heat pump air conditioning system comprises a refrigerant loop and a cooling liquid loop. The cooling liquid loop comprises a compressor, a four-way reversing valve, a gas-liquid separator, a heat regenerator, a vehicle outside heat exchanger, a vehicle outside fan, a passenger compartment side heat exchanger, a battery side heat exchanger, a first electronic expansion valve, a second electronic expansion valve, a third electronic expansion valve, a four-way reversing valve and a three-way valve; the cooling liquid loop comprises a passenger compartment water pump, a passenger compartment inner heat exchanger, a battery water pump and a battery cold plate. In addition, the invention further discloses nine working modes and a control method of the system. According to the system, the low-temperature heating performance of the new energy automobile heat pump air conditioning system can be improved by recycling battery waste heat, and the system is simple in structure, stable and reliable.

Description

Technical Field

[0001] The present invention belongs to the field of new energy vehicles, and specifically relates to a new energy vehicle integrated heat pump air conditioning system with battery waste heat recovery and a control method thereof. Background Art

[0002] With the rapid development of the new energy vehicle industry, how to improve the energy efficiency of the heat pump air-conditioning system and the energy utilization efficiency of the vehicle thermal management system has become a research focus. In fact, new energy vehicles, especially commercial vehicles such as heavy-duty trucks and mining trucks, will generate a large amount of waste heat for use even when operating in low-temperature conditions in winter, which provides a basis for further improving the heating performance of the heat pump air-conditioning system of new energy vehicles under low-temperature conditions. Based on the purpose of utilizing battery waste heat to further improve the heating performance of new energy vehicle heat pump air-conditioning, this application proposes a new energy vehicle integrated heat pump air-conditioning system with battery waste heat recovery, and provides a variety of working modes and control methods, thereby significantly improving the low-temperature heating performance of the new energy vehicle heat pump air-conditioning, reducing the energy consumption of the vehicle thermal management system, and improving the low-temperature endurance and market competitiveness of new energy vehicles. Summary of the invention

[0003] In order to address the deficiencies of the prior art, the present invention aims to propose an integrated heat pump air-conditioning system for new energy vehicles with battery waste heat recovery, and provide a control method thereof. The system can effectively utilize the battery waste heat generated by the vehicle under low temperature conditions to improve the heating performance of the system.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an integrated heat pump air-conditioning system for new energy vehicles with battery waste heat recovery, comprising a refrigerant circuit and a coolant circuit.

[0005] The refrigerant circuit includes a compressor, the compressor outlet is connected to the d port of the four-way reversing valve, the b port of the four-way reversing valve is connected to the inlet of the gas-liquid separator, the gas outlet of the gas-liquid separator is connected to the d port of the regenerator, the c port of the regenerator is connected to the compressor inlet, the a port of the regenerator is connected to one end of the first electronic expansion valve, the other end of the first electronic expansion valve is connected to one end of the vehicle-side heat exchanger, the other end of the vehicle-side heat exchanger is connected to the c port of the four-way reversing valve and the c port of the three-way valve, the b port of the regenerator is connected to one end of the second electronic expansion valve and one end of the third expansion valve, the other end of the second electronic expansion valve is connected to the a port of the passenger compartment side heat exchanger, the b port of the passenger compartment side heat exchanger is connected to the a port of the four-way reversing valve and the b port of the three-way valve, the other end of the third electronic expansion valve is connected to the a port of the battery side heat exchanger, and the b port of the battery side heat exchanger is connected to the a port of the three-way valve.

[0006] The coolant circuit includes a passenger compartment water pump, the passenger compartment water pump outlet is connected to the c port of the passenger compartment side heat exchanger, the d port of the passenger compartment side heat exchanger is connected to one end of the heat exchanger in the passenger compartment, and the other end of the heat exchanger in the passenger compartment is connected to the passenger compartment water pump inlet; the battery water pump outlet is connected to the c port of the battery side heat exchanger, the d port of the battery side heat exchanger is connected to one end of the battery cold plate, and the other end of the battery cold plate is connected to the battery water pump inlet.

[0007] The heat exchanger outside the vehicle and the heat exchanger inside the passenger compartment are fin-tube heat exchangers or parallel-flow heat exchangers, and the outside fan is installed on the surface of the heat exchanger outside the vehicle.

[0008] The regenerator is provided with a first channel and a second channel for the refrigerant to flow therein, the a port and the b port are ports of the first channel, and the c port and the d port are ports of the second channel.

[0009] The passenger compartment side heat exchanger and the battery side heat exchanger are provided with a first channel for refrigerant flow and a second channel for coolant flow, port a and port b are ports of the first channel, and port c and port d are ports of the second channel.

[0010] The four-way reversing valve realizes switching between the first working mode and the second working mode by different internal conduction modes of the four connection ports; wherein, the first working mode is that the a port and the b port are internally connected, and the c port and the d port are internally connected; the second working mode is that the a port and the d port are internally connected, and the b port and the c port are internally connected.

[0011] The three-way valve realizes switching between the first working mode and the second working mode by different internal conduction modes of the three connection ports; wherein, in the first working mode, port a and port b are internally connected, and port a and port c are not connected; and in the second working mode, port a and port c are internally connected, and port a and port b are not connected.

[0012] The present invention also proposes a control method and working mode of the above-mentioned new energy vehicle integrated heat pump air conditioning system with battery waste heat recovery. The system working modes include single passenger compartment cooling mode, single battery cooling mode, passenger compartment cooling + battery cooling mode, single passenger compartment heating mode, single battery heating mode, passenger compartment heating + battery heating mode, passenger compartment heating + battery cooling first mode, passenger compartment heating + battery cooling second mode, and defrost mode. The system working mode is switched by controlling the four-way reversing valve, the three-way valve, the first electronic expansion valve, the second electronic expansion valve, the third electronic expansion valve and the vehicle external fan. The specific implementation steps are: (1) Single passenger compartment cooling mode: When only the passenger compartment requests cooling, the system starts the single passenger compartment cooling mode, the compressor starts, the four-way reversing valve switches to the first working mode, the three-way valve switches to the first working mode, the passenger compartment water pump starts, the battery water pump turns off, the vehicle exterior fan starts, the third electronic expansion valve turns off, the first electronic expansion valve and the second electronic expansion valve turn on and automatically adjust the opening according to the system operating conditions; (2) Single battery cooling mode: When only the battery requests cooling, the system starts the single battery cooling mode, the compressor starts, the four-way reversing valve switches to the first working mode, the three-way valve switches to the first working mode, the passenger compartment water pump is turned off, the battery water pump is turned on, the vehicle exterior fan is turned on, the second electronic expansion valve is turned off, the first electronic expansion valve and the third electronic expansion valve are turned on and their openings are automatically adjusted according to the system operating conditions; (3) Passenger compartment cooling + battery cooling mode: When the passenger compartment and the battery request cooling at the same time, the system starts the passenger compartment cooling + battery cooling mode, the compressor starts, the four-way reversing valve switches to the first working mode, the three-way valve switches to the first working mode, the passenger compartment water pump starts, the battery water pump starts, the external fan starts, the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve start and automatically adjust their openings according to the system operating conditions; (4) Single passenger compartment heating mode: When only the passenger compartment requests heating, the system starts the single passenger compartment heating mode, the compressor starts, the four-way reversing valve switches to the second working mode, the three-way valve switches to the first working mode, the passenger compartment water pump starts, the battery water pump turns off, the vehicle exterior fan starts, the third electronic expansion valve turns off, the first electronic expansion valve and the second electronic expansion valve turn on and automatically adjust the opening according to the system operating conditions; (5) Single battery heating mode: When only the battery requests heating, the system starts the single battery heating mode, the compressor starts, the four-way reversing valve switches to the second working mode, the three-way valve switches to the first working mode, the passenger compartment water pump is turned off, the battery water pump is turned on, the vehicle exterior fan is turned on, the second electronic expansion valve is turned off, the first electronic expansion valve and the third electronic expansion valve are turned on and the openings are automatically adjusted according to the system operating conditions; (6) Passenger compartment heating + battery heating mode: When the passenger compartment and the battery request heating at the same time, the system starts the passenger compartment heating + battery heating mode, the compressor starts, the four-way reversing valve switches to the second working mode, the three-way valve switches to the first working mode, the passenger compartment water pump starts, the battery water pump starts, the external fan starts, the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve start and automatically adjust the opening according to the system operating conditions; (7) Passenger compartment heating + battery cooling first mode: When the passenger compartment requests heating and the battery requests cooling, and the system determines that the heat generated by the battery is less than the passenger compartment heating demand, the system starts the passenger compartment heating + battery cooling first mode, the compressor starts, the four-way reversing valve switches to the second working mode, the three-way valve switches to the second working mode, the passenger compartment water pump starts, the battery water pump starts, the external fan turns off, the first electronic expansion valve turns off, the second electronic expansion valve opens fully, and the third electronic expansion valve turns on and automatically adjusts its opening according to the system operating conditions; (8) Passenger compartment heating + battery cooling second mode: When the passenger compartment requests heating and the battery requests cooling, and the system determines that the heat generated by the battery is greater than the passenger compartment heating demand, the system starts the passenger compartment heating + battery cooling second mode, the compressor starts, the four-way reversing valve switches to the second working mode, the three-way valve switches to the second working mode, the passenger compartment water pump starts, the battery water pump starts, the vehicle exterior fan starts, the second electronic expansion valve is fully opened, the first electronic expansion valve and the third electronic expansion valve are opened and the openings are automatically adjusted according to the system operating conditions; (9) Defrost mode: When the system determines that the heat exchanger outside the vehicle needs to be defrosted, the system starts the defrost mode, the compressor starts, the four-way reversing valve switches to the first working mode, the three-way valve switches to the first working mode, the passenger compartment water pump is turned off, the battery water pump is turned off, the vehicle's external fan is turned off, and the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve are fully opened.

[0013] The present invention provides a new energy vehicle integrated heat pump air conditioning system with battery waste heat recovery and a control method thereof, which has the following beneficial effects compared with the prior art: (1) The system can improve the heating performance of the heat pump air conditioner of new energy vehicles under low temperature conditions by utilizing the waste heat of the battery, reduce the energy consumption of the thermal management system, and improve the endurance of the vehicle; (2) Indirect heat exchange between the system and the passenger compartment is achieved through a coolant circuit. On the one hand, it can reduce the length of the refrigerant pipeline and the number of joints, thereby reducing the risk of fluid leakage. On the other hand, it facilitates the modular and compact design of the system, reduces installation space, and reduces production and installation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention. The refrigerant circuit includes: 101-compressor, 102-four-way reversing valve, 103-gas-liquid separator, 104-regenerator, 105-first electronic expansion valve, 106-outside vehicle heat exchanger, 107-outside vehicle fan, 108-second electronic expansion valve, 109-passenger compartment side heat exchanger, 110-third electronic expansion valve, 111-battery side heat exchanger, 112-three-way valve; The coolant circuit includes: 113 - passenger compartment water pump, 114 - passenger compartment heat exchanger, 115 - battery water pump, 116 - battery cold plate. DETAILED DESCRIPTION

[0015] The present invention is illustrated by the following embodiments, but the present invention is not limited to the following embodiments. All implementation methods that meet the above-mentioned purposes are within the technical scope of the present invention. The present invention will be further described below in conjunction with the accompanying drawings.

[0016] A new energy vehicle integrated heat pump air conditioning system with battery waste heat recovery includes a refrigerant circuit and a coolant circuit.

[0017] The refrigerant circuit comprises a compressor 101, the outlet of the compressor 101 is connected to the d port of a four-way reversing valve 102, the b port of the four-way reversing valve 102 is connected to the inlet of a gas-liquid separator 103, the gas outlet of the gas-liquid separator 103 is connected to the d port of a regenerator 104, the c port of the regenerator 104 is connected to the inlet of the compressor 101, the a port of the regenerator 104 is connected to one end of a first electronic expansion valve 105, the other end of the first electronic expansion valve 105 is connected to one end of a vehicle-outside heat exchanger 106, and the other end of the vehicle-outside heat exchanger 106 is connected to the four-way reversing valve The c port of 102 and the c port of the three-way valve 112, the b port of the heat regenerator 104 is connected to one end of the second electronic expansion valve 108 and one end of the third electronic expansion valve 110, the other end of the second electronic expansion valve 108 is connected to the a port of the passenger compartment side heat exchanger 109, the b port of the passenger compartment side heat exchanger 109 is connected to the a port of the four-way reversing valve 102 and the b port of the three-way valve 112, the other end of the third electronic expansion valve 110 is connected to the a port of the battery side heat exchanger 111, and the b port of the battery side heat exchanger 111 is connected to the a port of the three-way valve 112.

[0018] The coolant circuit includes a passenger compartment water pump 113, the outlet of the passenger compartment water pump 113 is connected to the c port of the passenger compartment side heat exchanger 109, the d port of the passenger compartment side heat exchanger 109 is connected to one end of the heat exchanger 114 in the passenger compartment, and the other end of the heat exchanger 114 in the passenger compartment is connected to the inlet of the passenger compartment water pump 113; the outlet of the battery water pump 115 is connected to the c port of the battery side heat exchanger 111, the d port of the battery side heat exchanger 111 is connected to one end of the battery cold plate 116, and the other end of the battery cold plate 116 is connected to the inlet of the battery water pump 115.

[0019] The vehicle exterior heat exchanger 106 and the passenger compartment heat exchanger 114 are fin-tube heat exchangers or parallel flow heat exchangers, and the vehicle exterior fan 107 is installed on the surface of the vehicle exterior heat exchanger 106 .

[0020] The regenerator 104 is provided with a first channel and a second channel for the refrigerant to flow therein, wherein the a port and the b port are ports of the first channel, and the c port and the d port are ports of the second channel.

[0021] The passenger compartment side heat exchanger 109 and the battery side heat exchanger 111 are provided with a first channel for refrigerant flow and a second channel for coolant flow, port a and port b are ports of the first channel, port c and port d are ports of the second channel.

[0022] The four-way reversing valve 102 realizes switching between the first working mode and the second working mode by different internal conduction modes of the four connection ports; wherein, the first working mode is that port a and port b are internally connected, and port c and port d are internally connected; the second working mode is that port a and port d are internally connected, and port b and port c are internally connected.

[0023] The three-way valve 112 realizes switching between the first working mode and the second working mode by different internal conduction modes of the three connection ports; wherein, in the first working mode, port a and port b are internally connected, and port a and port c are not connected; and in the second working mode, port a and port c are internally connected, and port a and port b are not connected.

[0024] The present invention also proposes a control method and working mode of the above-mentioned new energy vehicle integrated heat pump air conditioning system with battery waste heat recovery. The system working modes include single passenger compartment cooling mode, single battery cooling mode, passenger compartment cooling + battery cooling mode, single passenger compartment heating mode, single battery heating mode, passenger compartment heating + battery heating mode, passenger compartment heating + battery cooling first mode, passenger compartment heating + battery cooling second mode, and defrost mode. The system working mode is switched by controlling the four-way reversing valve 102, the three-way valve 112, the first electronic expansion valve 105, the second electronic expansion valve 108, the third electronic expansion valve 110 and the vehicle external fan 107. The specific implementation steps are as follows: (1) Single passenger compartment cooling mode: When only the passenger compartment requests cooling, the system starts the single passenger compartment cooling mode, the compressor 101 is turned on, the four-way reversing valve 102 is switched to the first working mode, the three-way valve 112 is switched to the first working mode, the passenger compartment water pump 113 is turned on, the battery water pump 115 is turned off, the vehicle exterior fan 107 is turned on, the third electronic expansion valve 110 is turned off, the first electronic expansion valve 105 and the second electronic expansion valve 108 are turned on and the openings are automatically adjusted according to the system operating conditions; (2) Single battery cooling mode: When only the battery requests cooling, the system starts the single battery cooling mode, the compressor 101 is turned on, the four-way reversing valve 102 is switched to the first working mode, the three-way valve 112 is switched to the first working mode, the passenger compartment water pump 113 is turned off, the battery water pump 115 is turned on, the external fan 107 is turned on, the second electronic expansion valve 108 is turned off, the first electronic expansion valve 105 and the third electronic expansion valve 110 are turned on and the openings are automatically adjusted according to the system operating conditions; (3) Passenger compartment cooling + battery cooling mode: When the passenger compartment and the battery request cooling at the same time, the system starts the passenger compartment cooling + battery cooling mode, the compressor 101 is turned on, the four-way reversing valve 102 is switched to the first working mode, the three-way valve 112 is switched to the first working mode, the passenger compartment water pump 113 is turned on, the battery water pump 115 is turned on, the external fan 107 is turned on, the first electronic expansion valve 105, the second electronic expansion valve 108 and the third electronic expansion valve 110 are turned on and the opening degrees are automatically adjusted according to the system working conditions; (4) Single passenger compartment heating mode: When only the passenger compartment requests heating, the system starts the single passenger compartment heating mode, the compressor 101 is turned on, the four-way reversing valve 102 is switched to the second working mode, the three-way valve 112 is switched to the first working mode, the passenger compartment water pump 113 is turned on, the battery water pump 115 is turned off, the vehicle exterior fan 107 is turned on, the third electronic expansion valve 110 is turned off, the first electronic expansion valve 105 and the second electronic expansion valve 108 are turned on and the openings are automatically adjusted according to the system operating conditions; (5) Single battery heating mode: When only the battery requests heating, the system starts the single battery heating mode, the compressor 101 is turned on, the four-way reversing valve 102 is switched to the second working mode, the three-way valve 112 is switched to the first working mode, the passenger compartment water pump 113 is turned off, the battery water pump 115 is turned on, the vehicle exterior fan 107 is turned on, the second electronic expansion valve 108 is turned off, the first electronic expansion valve 105 and the third electronic expansion valve 110 are turned on and the openings are automatically adjusted according to the system operating conditions; (6) Passenger compartment heating + battery heating mode: When the passenger compartment and the battery request heating at the same time, the system starts the passenger compartment heating + battery heating mode, the compressor 101 is turned on, the four-way reversing valve 102 is switched to the second working mode, the three-way valve 112 is switched to the first working mode, the passenger compartment water pump 113 is turned on, the battery water pump 115 is turned on, the vehicle exterior fan 107 is turned on, the first electronic expansion valve 105, the second electronic expansion valve 108 and the third electronic expansion valve 110 are turned on and the openings are automatically adjusted according to the system operating conditions; (7) Passenger compartment heating + battery cooling first mode: When the passenger compartment requests heating and the battery requests cooling, and the system determines that the battery heat generation is less than the passenger compartment heating demand, the system starts the passenger compartment heating + battery cooling first mode, the compressor 101 is turned on, the four-way reversing valve 102 is switched to the second working mode, the three-way valve 112 is switched to the second working mode, the passenger compartment water pump 113 is turned on, the battery water pump 115 is turned on, the external fan 107 is turned off, the first electronic expansion valve 105 is turned off, the second electronic expansion valve 108 is fully opened, and the third electronic expansion valve 110 is turned on and automatically adjusts its opening according to the system operating conditions; (8) Passenger compartment heating + battery cooling second mode: When the passenger compartment requests heating and the battery requests cooling, and the system determines that the heat generated by the battery is greater than the passenger compartment heating demand, the system starts the passenger compartment heating + battery cooling second mode, the compressor 101 is turned on, the four-way reversing valve 102 is switched to the second working mode, the three-way valve 112 is switched to the second working mode, the passenger compartment water pump 113 is turned on, the battery water pump 115 is turned on, the vehicle exterior fan 107 is turned on, the second electronic expansion valve 108 is fully opened, the first electronic expansion valve 105 and the third electronic expansion valve 110 are turned on and the openings are automatically adjusted according to the system operating conditions; (9) Defrost mode: When the system determines that the vehicle-side heat exchanger 106 needs to be defrosted, the system starts the defrost mode, the compressor 101 is turned on, the four-way reversing valve 102 is switched to the second working mode, the three-way valve 112 is switched to the first working mode, the passenger compartment water pump 113 is turned off, the battery water pump 115 is turned off, the vehicle-side fan 107 is turned off, and the first electronic expansion valve 105, the second electronic expansion valve 108 and the third electronic expansion valve 110 are fully opened.

Claims

1. A new energy vehicle integrated heat pump air conditioning system with battery waste heat recovery, characterized in that: Contains a refrigerant circuit and a coolant circuit; The refrigerant circuit includes a compressor, the compressor outlet is connected to the d port of the four-way reversing valve, the b port of the four-way reversing valve is connected to the inlet of the gas-liquid separator, the gas outlet of the gas-liquid separator is connected to the d port of the regenerator, the c port of the regenerator is connected to the compressor inlet, the a port of the regenerator is connected to one end of the first electronic expansion valve, the other end of the first electronic expansion valve is connected to one end of the vehicle-side heat exchanger, the other end of the vehicle-side heat exchanger is connected to the c port of the four-way reversing valve and the c port of the three-way valve, the b port of the regenerator is connected to one end of the second electronic expansion valve and one end of the third expansion valve, the other end of the second electronic expansion valve is connected to the a port of the passenger compartment side heat exchanger, the b port of the passenger compartment side heat exchanger is connected to the a port of the four-way reversing valve and the b port of the three-way valve, the other end of the third electronic expansion valve is connected to the a port of the battery side heat exchanger, and the b port of the battery side heat exchanger is connected to the a port of the three-way valve; The coolant circuit includes a passenger compartment water pump, the passenger compartment water pump outlet is connected to the c port of the passenger compartment side heat exchanger, the d port of the passenger compartment side heat exchanger is connected to one end of the heat exchanger in the passenger compartment, and the other end of the heat exchanger in the passenger compartment is connected to the passenger compartment water pump inlet; the battery water pump outlet is connected to the c port of the battery side heat exchanger, the d port of the battery side heat exchanger is connected to one end of the battery cold plate, and the other end of the battery cold plate is connected to the battery water pump inlet.

2. The new energy vehicle integrated heat pump air conditioning system with battery waste heat recovery according to claim 1, characterized in that: The heat exchanger outside the vehicle and the heat exchanger inside the passenger compartment are fin-tube heat exchangers or parallel-flow heat exchangers, and the outside fan is installed on the surface of the heat exchanger outside the vehicle.

3. The new energy vehicle integrated heat pump air conditioning system with battery waste heat recovery according to claim 1, characterized in that: The regenerator is provided with a first channel and a second channel for the refrigerant to flow therein, the a port and the b port are ports of the first channel, and the c port and the d port are ports of the second channel.

4. The integrated heat pump air conditioning system for new energy vehicles with battery waste heat recovery according to claim 1 is characterized in that: The passenger compartment side heat exchanger and the battery side heat exchanger are provided with a first channel for refrigerant flow and a second channel for coolant flow, port a and port b are ports of the first channel, and port c and port d are ports of the second channel.

5. The integrated heat pump air conditioning system for new energy vehicles with battery waste heat recovery according to claim 1 is characterized in that: The four-way reversing valve realizes switching between the first working mode and the second working mode by different internal conduction modes of the four connection ports; wherein, the first working mode is that the a port and the b port are internally connected, and the c port and the d port are internally connected; the second working mode is that the a port and the d port are internally connected, and the b port and the c port are internally connected.

6. The new energy vehicle integrated heat pump air conditioning system with battery waste heat recovery according to claim 1, characterized in that: The three-way valve realizes switching between the first working mode and the second working mode by different internal conduction modes of the three connection ports; wherein, in the first working mode, port a and port b are internally connected, and port a and port c are not connected; and in the second working mode, port a and port c are internally connected, and port a and port b are not connected.

7. A control method for a new energy vehicle integrated heat pump air conditioning system with battery waste heat recovery based on any one of claims 1 to 6, characterized in that: The system working modes include single passenger compartment cooling mode, single battery cooling mode, passenger compartment cooling + battery cooling mode, single passenger compartment heating mode, single battery heating mode, passenger compartment heating + battery heating mode, passenger compartment heating + battery cooling first mode, passenger compartment heating + battery cooling second mode, and defrost mode. The system working mode is switched by controlling the four-way reversing valve, the three-way valve, the first electronic expansion valve, the second electronic expansion valve, the third electronic expansion valve, and the external fan. The specific implementation steps are as follows: (1) Single passenger compartment cooling mode: When only the passenger compartment requests cooling, the system starts the single passenger compartment cooling mode, the compressor starts, the four-way reversing valve switches to the first working mode, the three-way valve switches to the first working mode, the passenger compartment water pump starts, the battery water pump turns off, the vehicle exterior fan starts, the third electronic expansion valve turns off, the first electronic expansion valve and the second electronic expansion valve turn on and automatically adjust the opening according to the system operating conditions; (2) Single battery cooling mode: When only the battery requests cooling, the system starts the single battery cooling mode, the compressor starts, the four-way reversing valve switches to the first working mode, the three-way valve switches to the first working mode, the passenger compartment water pump is turned off, the battery water pump is turned on, the vehicle exterior fan is turned on, the second electronic expansion valve is turned off, the first electronic expansion valve and the third electronic expansion valve are turned on and their openings are automatically adjusted according to the system operating conditions; (3) Passenger compartment cooling + battery cooling mode: When the passenger compartment and the battery request cooling at the same time, the system starts the passenger compartment cooling + battery cooling mode, the compressor starts, the four-way reversing valve switches to the first working mode, the three-way valve switches to the first working mode, the passenger compartment water pump starts, the battery water pump starts, the external fan starts, the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve start and automatically adjust their openings according to the system operating conditions; (4) Single passenger compartment heating mode: When only the passenger compartment requests heating, the system starts the single passenger compartment heating mode, the compressor starts, the four-way reversing valve switches to the second working mode, the three-way valve switches to the first working mode, the passenger compartment water pump starts, the battery water pump turns off, the vehicle exterior fan starts, the third electronic expansion valve turns off, the first electronic expansion valve and the second electronic expansion valve turn on and automatically adjust the opening according to the system operating conditions; (5) Single battery heating mode: When only the battery requests heating, the system starts the single battery heating mode, the compressor starts, the four-way reversing valve switches to the second working mode, the three-way valve switches to the first working mode, the passenger compartment water pump is turned off, the battery water pump is turned on, the vehicle exterior fan is turned on, the second electronic expansion valve is turned off, the first electronic expansion valve and the third electronic expansion valve are turned on and the openings are automatically adjusted according to the system operating conditions; (6) Passenger compartment heating + battery heating mode: When the passenger compartment and the battery request heating at the same time, the system starts the passenger compartment heating + battery heating mode, the compressor starts, the four-way reversing valve switches to the second working mode, the three-way valve switches to the first working mode, the passenger compartment water pump starts, the battery water pump starts, the external fan starts, the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve start and automatically adjust the opening according to the system operating conditions; (7) Passenger compartment heating + battery cooling first mode: When the passenger compartment requests heating and the battery requests cooling, and the system determines that the heat generated by the battery is less than the passenger compartment heating demand, the system starts the passenger compartment heating + battery cooling first mode, the compressor starts, the four-way reversing valve switches to the second working mode, the three-way valve switches to the second working mode, the passenger compartment water pump starts, the battery water pump starts, the external fan turns off, the first electronic expansion valve turns off, the second electronic expansion valve opens fully, and the third electronic expansion valve turns on and automatically adjusts its opening according to the system operating conditions; (8) Passenger compartment heating + battery cooling second mode: When the passenger compartment requests heating and the battery requests cooling, and the system determines that the heat generated by the battery is greater than the passenger compartment heating demand, the system starts the passenger compartment heating + battery cooling second mode, the compressor starts, the four-way reversing valve switches to the second working mode, the three-way valve switches to the second working mode, the passenger compartment water pump starts, the battery water pump starts, the vehicle exterior fan starts, the second electronic expansion valve is fully opened, the first electronic expansion valve and the third electronic expansion valve are opened and the openings are automatically adjusted according to the system operating conditions; (9) Defrost mode: When the system determines that the heat exchanger outside the vehicle needs to be defrosted, the system starts the defrost mode, the compressor starts, the four-way reversing valve switches to the first working mode, the three-way valve switches to the first working mode, the passenger compartment water pump is turned off, the battery water pump is turned off, the vehicle's external fan is turned off, and the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve are fully opened.

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