CO2 indirect type heat pump system and electric commercial vehicle

Abstract

The invention discloses a CO2 indirect type heat pump system and an electric commercial vehicle, the system comprises a battery heat pump system and a cab heat pump system with independent refrigerant loops, the requirements for battery temperature control and cab comfort are efficiently met, the battery heat pump system and the cab heat pump system are both isolated from a cab, and the battery heat pump system and the cab heat pump system are isolated from the cab. The safety of the thermal management system is effectively improved; the three-way valve, the four-way valve and the nine-way valve are combined to effectively meet the requirements of shunting and converging of cooling liquid, and the system is suitable for 25 working modes of the heat pump; the front-end heat dissipation module comprises an independent mode and a parallel mode, self-circulation heat dissipation of the motor can be achieved, cooling liquid is heated through waste heat of the motor, the front-end heat dissipation module is particularly suitable for recycling the waste heat of the motor to heat a battery, and energy consumption of a compressor and electric heating PTC is effectively reduced; a cab inlet parallel module can be selected, cooling liquid enters a cab cold air core body and a cab warm air core body, and the cab heat exchange amount is increased; low-temperature cooling liquid flows into the cold air core body, the cab electric heating PTC is started, and the device is suitable for a cab demisting mode.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal management of electric commercial vehicles and relates to a CO2 indirect heat pump system and an electric commercial vehicle. Background Art

[0002] The application of electric commercial vehicles promotes the low-carbon, high-quality and sustainable development of the freight industry. The popularization of electric commercial vehicles reduces the transportation industry's dependence on fossil energy and effectively reduces greenhouse gas emissions. In order to avoid battery thermal runaway, ensure a good operating temperature of the battery, and improve the temperature comfort of the cab, an efficient thermal management system has become an indispensable part of electric commercial vehicles.

[0003] Since electric commercial vehicles are loaded with high-energy-density, high-output power batteries, the batteries heat up severely under harsh conditions such as high temperatures in summer and long-term heavy-load climbing. The thermal management system must effectively reduce the battery temperature to avoid thermal runaway. Under low-temperature conditions in winter, PTC heating of the battery and cab consumes a lot of electricity, which significantly affects the cruising range. The heat pump reverse cycle working mode gets rid of the dilemma of excessive dependence on electric heating PTC in heating conditions, and is an effective solution to increase cruising range. And compared with traditional air-conditioning systems with integrated cooling, PTC heating and motor liquid cooling, the heat pump system can integrate the temperature control requirements of the battery and cab, recover the motor waste heat, and improve the system energy efficiency.

[0004] Heat pump refrigerants are key factors in improving system performance and promoting the development of thermal management systems. Environmentally friendly refrigerant CO2 has become an ideal choice to replace traditional refrigerants due to its extremely low global warming potential and high efficiency heating performance. However, the extremely high operating pressure and safety of CO2 refrigerants have always been important reasons hindering its widespread application.

[0005] In summary, developing a heat pump system with high heating performance for electric commercial vehicles to efficiently meet the heating and cooling needs of the battery pack and the cab, which have very different heating and cooling requirements, has become one of the huge challenges we face at this stage. In addition, separating the high-pressure refrigerant circuit from the cab and improving system safety are also key technical issues that need to be solved to promote the application of CO2 heat pump systems. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of low heating efficiency under low-temperature conditions in the thermal management system for electric commercial vehicles in the prior art, and to provide a CO2 indirect heat pump system and an electric commercial vehicle.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention proposes a CO2 indirect heat pump system, comprising a battery heat pump system, a cab heat pump system, a front-end heat dissipation module and a cab module; The battery heat pump system is used to control the battery temperature in an electric commercial vehicle; The cab heat pump system is used to control the cab temperature of an electric commercial vehicle; The front-end heat dissipation module is used to realize the heat pump system's cyclic heat dissipation and heat absorption; The cab module is used to adjust the amount of heat exchange in the cab; Among them, the first port of the battery heat pump system is connected to the first port of the cab heat pump system, the second port of the battery heat pump system is connected to the first port of the front end heat dissipation module, the second port of the front end heat dissipation module is connected to the second port of the cab heat pump system, and the third port of the cab heat pump system is connected to the cab module.

[0008] Preferably, the battery heat pump system includes a battery heat pump system refrigerant circuit and a battery heat pump system coolant circuit; the battery heat pump system refrigerant circuit includes a first compressor, a first gas cooler, a first regenerator, a first throttle valve, a first evaporator, a first gas-liquid separator and a first regenerator bypass valve; the battery heat pump system coolant circuit includes a first water pump, a four-way valve, a battery heating PTC, a second water pump, a first proportional three-way valve and a fifth proportional three-way valve; The outlet of the first compressor is connected to the refrigerant inlet of the first gas cooler, the outlet of the first gas cooler is connected to the inlet of the first evaporator through the first pipeline of the first regenerator, the outlet of the first evaporator is connected to the second pipeline of the first regenerator through the first gas-liquid separator, and the outlet of the second pipeline is connected to the inlet of the first compressor; a first regenerator bypass valve is provided between the outlet of the first gas-liquid separator and the inlet of the first compressor; The outlet of the first water pump is connected to the A port of the four-way valve, the D port of the four-way valve is connected to the coolant inlet of the power battery through the battery heating PTC, the coolant outlet of the power battery is connected to the F port of the nine-way valve, the H port of the nine-way valve is connected to the inlet of the first water pump, the C port of the first proportional three-way valve is connected to the inlet of the second water pump, the outlet of the second water pump is connected to the C port of the four-way valve through the first evaporator, the B port of the four-way valve is connected to the A port of the fifth proportional three-way valve, the B port of the fifth proportional three-way valve is connected to the front-end cooling module, the C port of the fifth proportional three-way valve is connected to the E port of the nine-way valve, the B port of the first proportional three-way valve is connected to the G port of the nine-way valve; the A port of the first proportional three-way valve is connected to the cab heat pump system.

[0009] Preferably, it also includes an air conditioning box, which includes a cold air core, a warm air core and a fan; The cold air core is connected in series with the warm air core, and the wind blown out by the fan passes through the warm air core and the cold air core in sequence.

[0010] Preferably, the cab heat pump system includes a cab heat pump system refrigerant circuit and a cab heat pump system coolant circuit; the cab heat pump system refrigerant circuit includes a second compressor, a second gas cooler, a second regenerator, a second throttle valve, a second evaporator, a second gas-liquid separator and a second regenerator bypass valve; the cab heat pump system coolant circuit includes a third water pump, a cab heating PTC, a fourth proportional three-way valve, a third proportional three-way valve, a fourth water pump and a second proportional three-way valve; The outlet of the second compressor is connected to the refrigerant inlet of the second gas cooler, the outlet of the second gas cooler is connected to the inlet of the second evaporator through the first pipeline of the second regenerator, the outlet of the second evaporator is connected to the second pipeline of the second regenerator through the second gas-liquid separator, and the outlet of the second pipeline is connected to the inlet of the second compressor; a second regenerator bypass valve is provided between the outlet of the second gas-liquid separator and the inlet of the second compressor; The outlet of the third water pump is connected to the I port of the nine-way valve, the C port of the fourth proportional three-way valve is connected to the B port of the third proportional three-way valve, the A port of the third proportional three-way valve is connected to the inlet of the third water pump, the C port of the third proportional three-way valve is connected to the B port of the nine-way valve, the A port of the fourth proportional three-way valve is connected to the B port of the second proportional three-way valve, the A port of the second proportional three-way valve is connected to the second evaporator through the fourth water pump, the outlet of the second evaporator is connected to the A port of the nine-way valve, the C port of the second proportional three-way valve is connected to the battery heat pump system, and the B port of the fourth proportional three-way valve is connected to the cab module.

[0011] Preferably, when the cab module is an inlet parallel module, the inlet parallel module includes a cab heating PTC, an eighth proportional three-way valve and a ninth proportional three-way valve; The A port of the eighth proportion three-way valve is connected to the C port of the nine-way valve, the B port of the eighth proportion three-way valve is connected to the cold air core inlet, the C port of the eighth proportion three-way valve is connected to the cab heating PTC, the B port of the ninth proportion three-way valve is connected to the warm air core outlet, the C port of the ninth proportion three-way valve is connected to the cold air core outlet, and the A port of the ninth proportion three-way valve is connected to the cab heat pump system.

[0012] Preferably, when the cab module is an inlet series module, the inlet series module includes a cab heating PTC; The C port of the nine-way valve is connected to the inlet of the cold air core, the outlet of the cold air core is connected to the warm air core through the cab PTC, and the warm air core is connected to the cab heat pump system.

[0013] Preferably, the front-end heat dissipation module includes a first radiator, a second radiator, a sixth proportional three-way valve, a seventh proportional three-way valve, a cooling fan, a fifth water pump and a motor; The C port of the sixth proportion three-way valve is connected to the first radiator, the B port of the sixth proportion three-way valve is connected to the C port of the seventh proportion three-way valve through the second radiator, the B port of the sixth proportion three-way valve is connected to the motor through the fifth water pump, the motor outlet is connected to the B port of the seventh proportion three-way valve, the first radiator outlet is connected to the A port of the seventh proportion three-way valve and then to the D port of the nine-way valve, a cooling fan is provided at the second radiator, and the A port of the sixth proportion three-way valve is connected to the battery heat pump system.

[0014] Preferably, the front-end heat dissipation module is in independent mode: The A port and C port of the sixth proportional three-way valve are connected, and the B port is closed. The B port and C port of the seventh proportional three-way valve are connected, and the A port is closed. The motor coolant circulates independently through the fifth water pump, the motor, the seventh proportional three-way valve and the second radiator for liquid cooling, and the coolant exchanges heat with the air through the first radiator.

[0015] Preferably, the front-end heat dissipation module is in parallel mode: The A port, B port and C port of the sixth proportional three-way valve are all connected for proportional distribution, the A port and B port of the seventh proportional three-way valve are connected, and the C port is closed. The coolant passes through the B port of the sixth proportional three-way valve and the fifth water pump to exchange heat with the motor. At the same time, the coolant passes through the C port of the sixth proportional three-way valve and the first radiator to exchange heat with the air.

[0016] An electric commercial vehicle adopts a CO2 indirect heat pump system.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a CO2 indirect heat pump system, which includes a battery heat pump system and a cab heat pump system with independent refrigerant circuits, which efficiently meet the battery temperature control and cab comfort requirements, and the battery heat pump system and the cab heat pump system are both isolated from the cab, effectively improving the safety of the thermal management system; the front-end heat dissipation module proposed by the present invention includes an independent mode and a parallel mode, which can realize the self-circulation heat dissipation of the motor and use the motor waste heat to heat the coolant, which is particularly suitable for motor waste heat recovery to heat the battery, and effectively reduces the energy consumption of the compressor and the electric heating PTC; the cab inlet parallel module proposed by the present invention, the coolant enters the cab cold air core and the warm air core respectively, increasing the heat exchange of the cab; the low-temperature coolant flows into the cold air core, and the cab electric heating PTC is started, which is suitable for the cab defogging mode. Therefore, the technical solution provided by the present invention can provide a heat pump system with efficient heating performance, and the refrigerant circuits of the battery heat pump system and the cab heat pump system operate independently, effectively alleviating the cooling capacity demand pressure brought to the thermal management system by the high heat generation of the electric commercial vehicle battery, and the high-pressure refrigerant circuit is isolated from the cab, and the system safety is improved. The front-end cooling module includes independent mode and parallel mode, which can recover the waste heat of the motor to heat the battery and improve the energy efficiency of the system.

[0018] Furthermore, the combination of three-way valve, four-way valve and nine-way valve effectively realizes the requirements of coolant diversion and confluence, and is applicable to 25 working modes of the heat pump. Furthermore, a battery heating PTC is provided at the outlet of the four-way valve D to assist heating in extremely low temperature conditions. A cab heating PTC is provided at the inlet of the warm air core to assist heating in the demisting mode of the cab heat pump system and in extremely low temperature conditions.

[0019] Furthermore, when the motor temperature is low, the front-end heat dissipation module switches to parallel mode, and the coolant flows through the motor to lower the temperature; when the motor temperature is high, the front-end heat dissipation module switches to independent mode, and the motor dissipates heat through self-circulation; when the motor temperature is high and the battery has a heating request, the motor waste heat is recovered to heat the battery, reducing the battery heating PTC power consumption and the first compressor energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a diagram of a CO2 indirect heat pump system suitable for electric commercial vehicles according to the present invention.

[0022] Figure 2It is a schematic diagram of the cab and battery heat pump heating mode in the independent mode of the front-end heat dissipation module of the present invention.

[0023] Figure 3 It is a schematic diagram of the cab and battery heat pump heating mode in the parallel mode of the front-end heat dissipation module of the present invention.

[0024] Figure 4 It is a schematic diagram of the cab cooling and battery forced cooling mode of the present invention.

[0025] Figure 5 It is a schematic diagram of the self-circulation heat dissipation mode of the battery of the present invention.

[0026] Figure 6 It is a schematic diagram of the battery heating mode using motor waste heat according to the present invention.

[0027] Figure 7 It is a schematic diagram of the cab demisting mode of the present invention.

[0028] Figure 8 It is a schematic diagram of the cab cooling mode realized by the cab inlet parallel modules of the present invention.

[0029] Among them, 1. the first compressor; 2. the first gas cooler; 3. the first regenerator; 4. the first throttle valve; 5. the first evaporator; 6. the first gas-liquid separator; 7. the first regenerator bypass valve; 8. the first water pump; 9. the second water pump; 10. the first proportional three-way valve; 11. the nine-way valve; 12. the four-way valve; 13. the battery heating PTC; 14. the power battery; 15. the fifth proportional three-way valve; 16. the sixth proportional three-way valve; 17. the first radiator; 18. the second radiator; 19. the seventh proportional three-way valve; 20. the cooling fan; 21. the fifth water pump; 22. the motor; 23. the driving Cabin heating PTC; 24, cold air core; 25, warm air core; 26, fan; 27, fourth proportional three-way valve; 28, third proportional three-way valve; 29, second proportional three-way valve; 30, fourth water pump; 31, second evaporator; 32, second gas-liquid separator; 33, second throttle valve; 34, second regenerator; 35, second regenerator bypass valve; 36, third water pump; 37, second gas cooler; 38, second compressor; 39, second expansion kettle; 40, first expansion kettle; 41, third expansion kettle; 42, eighth proportional three-way valve; 43, ninth proportional three-way valve. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings: The present invention proposes a CO2 indirect heat pump system, comprising a battery heat pump system, a cab heat pump system, a front-end heat dissipation module and a cab module; The battery heat pump system is used to control the battery temperature in an electric commercial vehicle; The cab heat pump system is used to control the cab temperature of an electric commercial vehicle; The front-end heat dissipation module is used to realize the heat pump system's cyclic heat dissipation and heat absorption; The cab module is used to adjust the amount of heat exchange in the cab; Among them, the first port of the battery heat pump system is connected to the first port of the cab heat pump system, the second port of the battery heat pump system is connected to the first port of the front end heat dissipation module, the second port of the front end heat dissipation module is connected to the second port of the cab heat pump system, and the third port of the cab heat pump system is connected to the cab module.

[0037] The CO2 indirect heat pump integrated module includes a battery heat pump system and a cab heat pump system. The battery heat pump system includes a refrigerant circuit and a coolant circuit. The refrigerant circuit includes a first compressor 1, a first gas cooler 2, a first regenerator 3, a first throttle valve 4, a first evaporator 5, a first gas-liquid separator 6, and a first regenerator bypass valve 7 in order of flow direction. The coolant circuit includes a first water pump 8, a four-way valve 12, a battery heating PTC 13, a second water pump 9, a first proportional three-way valve 10, and a fifth proportional three-way valve 15. In the refrigerant circuit of the battery heat pump system, the outlet of the first compressor 1 is connected to the refrigerant inlet of the first gas cooler 2, the outlet of the first gas cooler 2 is connected to the inlet of the first evaporator 5 through the first pipeline of the first regenerator 3, the outlet of the first evaporator 5 is connected to the second pipeline of the first regenerator 3 through the first gas-liquid separator 6, and the outlet of the second pipeline is connected to the inlet of the first compressor 1; a first regenerator bypass valve 7 is provided between the outlet of the first gas-liquid separator 6 and the inlet of the first compressor 1; a first throttle valve 4 is provided between the first regenerator 3 and the first evaporator 5; In the coolant circuit of the battery heat pump system, the outlet of the first water pump 8 is connected to the four-way valve 12 A port through the first gas cooler 2, the four-way valve 12 D port is connected to the coolant inlet of the power battery 14 through the battery heating PTC 13, the coolant outlet of the power battery 14 is connected to the nine-way valve 11 F port, the nine-way valve 11 H port is connected to the inlet of the first water pump 8, the first proportional three-way valve 10C port is connected to the inlet of the second water pump 9, the outlet of the second water pump 9 is connected to the four-way valve 12 C port through the first evaporator 5, the four-way valve 12 B port is connected to the fifth proportional three-way valve 15 A port, the fifth proportional three-way valve 15 B port is connected to the front-end heat dissipation module, the fifth proportional three-way valve 15 C port is connected to the nine-way valve 11 E port, the first proportional three-way valve 10 B port is connected to the nine-way valve 11 G port; the first proportional three-way valve 10 A port is connected to the cab heat pump system.

[0038] A battery heating PTC 13 is provided at the D outlet of the four-way valve 12 , and the working modes of the four-way valve 12 include: mode 1: the AB end and the CD end are connected, mode 2: the AD end and the BC end are connected; The working modes of the nine-way valve 11 include: Mode 1: the AC end, EI end, FG end and DH (B) end are connected, and the three ports of DHB constitute a proportional distribution structure; Mode 2: the CI end, EA end, DG end and FH (B) end are connected, and FHB constitutes a proportional distribution structure; the first proportional three-way valve 10 and the second proportional three-way valve 29 are connected to distribute the coolant of the battery heat pump system and the coolant of the cab heat pump system; the third proportional three-way valve 28 and the fourth proportional three-way valve 27 are connected to switch the cooling mode and the heating mode of the cab heat pump system.

[0039] The battery heat pump system has the following working modes: Battery forced cooling mode: the first compressor 2 is started, the first regenerator bypass valve 7 is closed, and the refrigerant circuit circulation of the battery heat pump system is completed; the first water pump 8 and the second water pump 9 are started, the BC end of the first proportional three-way valve 10 is turned on, the AB end of the fifth proportional three-way valve 15 is turned on, and the AC end of the sixth proportional three-way valve 16 is turned on, the nine-way valve 11 switches to mode 1, and the four-way valve 12 switches to mode 1, completing the coolant circuit circulation of the battery heat pump system; Battery self-circulation heat dissipation mode: the first compressor 1 is turned off, and the refrigerant circuit circulation of the battery heat pump system is closed; the second water pump 9 is started, the BC end of the first proportional three-way valve 10 is turned on, the nine-way valve 11 switches to mode 1, and the four-way valve 12 switches to mode 1, completing the coolant circuit circulation of the battery heat pump system; Battery PTC heating mode: the first compressor 1 is turned off, and the refrigerant circuit of the battery heat pump system is closed; the second water pump 9 is started, the battery heating PTC 13 is started, the BC end of the first proportional three-way valve 10 is turned on, the nine-way valve 11 switches to mode 1, and the four-way valve 12 switches to mode 1, completing the coolant circuit of the battery heat pump system; Battery heat pump heating mode: the first compressor 1 is started, the first regenerator bypass valve 7 is turned on, and the refrigerant circuit circulation is completed; the first water pump 8 and the second water pump 9 are started, the BC end of the first proportional three-way valve 10 is turned on, the AB end of the fifth proportional three-way valve 15 is turned on, the AC end of the sixth proportional three-way valve 16 is turned on, and the nine-way valve 11 switches to mode 2 to complete the coolant circuit circulation of the battery heat pump system; Motor waste heat heating battery mode: the first compressor 1 is turned off, and the refrigerant circuit circulation of the battery heat pump system is turned off; the first water pump 8, the second water pump 9, and the fifth water pump 21 are started, the BC end of the first proportional three-way valve 10 is turned on, the AB end of the fifth proportional three-way valve 15 is turned on, the AB end of the sixth proportional three-way valve 16 is turned on, and the AB end of the seventh proportional three-way valve 19 is turned on, the four-way valve 12 switches to mode 2, and the nine-way valve 11 switches to mode 1, completing the coolant circuit circulation of the battery heat pump system.

[0040] The cab heat pump system includes a refrigerant circuit and a coolant circuit; the refrigerant circuit includes a second compressor 38, a second gas cooler 37, a second regenerator 34, a second throttle valve 33, a second evaporator 31, a second gas-liquid separator 32, and a second regenerator bypass valve 35 in order of flow direction; the coolant circuit includes a third water pump 36, a cab heating PTC 23, a fourth proportional three-way valve 27, a third proportional three-way valve 28, a fourth water pump 30, and a second proportional three-way valve 29; The cab heat pump system coolant circuit can select a cab inlet parallel module, including: an eighth proportional three-way valve 42, a ninth proportional three-way valve 43, and a cab heating PTC 23; In the refrigerant circuit of the cab heat pump system, the outlet of the second compressor 38 is connected to the refrigerant inlet of the second gas cooler 37, the outlet of the second gas cooler 37 is connected to the inlet of the second evaporator 31 through the first pipeline of the second reheater 34, the outlet of the second evaporator 31 is connected to the second pipeline of the second reheater 34 through the second gas-liquid separator 32, and the outlet of the second pipeline is connected to the inlet of the second compressor 38; a second reheater bypass valve 35 is provided between the outlet of the second gas-liquid separator 32 and the inlet of the second compressor 38; a second throttle valve 33 is provided between the second reheater 34 and the second evaporator 31; In the coolant circuit of the cab heat pump system, the outlet of the third water pump 36 is connected to the nine-way valve 11 I port through the second gas cooler 37, the fourth proportional three-way valve 27 C port is connected to the third proportional three-way valve 28 B port, the third proportional three-way valve 28 A port is connected to the inlet of the third water pump 36, the third proportional three-way valve 28 C port is connected to the nine-way valve 11 B port, the fourth proportional three-way valve 27 A port is connected to the second proportional three-way valve 29 B port, the second proportional three-way valve 29 A port is connected to the second evaporator 31 through the fourth water pump 30, the outlet of the second evaporator 31 is connected to the nine-way valve 11 A port, the second proportional three-way valve 29 C port is connected to the first proportional three-way valve 10 A port of the battery heat pump system, and the fourth proportional three-way valve 27 B port is connected to the cab module.

[0041] The cab module includes an inlet parallel module and an inlet series module; When the cab module is an inlet parallel module, the inlet parallel module includes a cab heating PTC23, an eighth proportional three-way valve 42 and a ninth proportional three-way valve 43; the eighth proportional three-way valve 42 A port is connected to the nine-way valve 11 C port, the eighth proportional three-way valve 42 B port is connected to the cold air core 24 inlet, the eighth proportional three-way valve 42 C port is connected to the cab heating PTC23, the ninth proportional three-way valve 43 B port is connected to the warm air core 25 outlet, the ninth proportional three-way valve 43 C port is connected to the cold air core 24 outlet, and the ninth proportional three-way valve 43 A port is connected to the fourth proportional three-way valve 27 B port of the cab heat pump system; When the cab module is an inlet series module, the inlet series module includes a cab heating PTC23; the C port of the nine-way valve 11 is connected to the inlet of the cold air core 24, the outlet of the cold air core 24 is connected to the warm air core 25 through the cab PTC 23, and the warm air core 25 is connected to the B port of the fourth proportional three-way valve 27 of the cab heat pump system.

[0042] The cab heat pump system has the following working modes: Cab cooling mode: the second compressor 38 is started, the second regenerator bypass valve 35 is closed, and the refrigerant circuit circulation of the cab heat pump system is completed; the third water pump 36 and the fourth water pump 30 are started, the AB end of the second proportional three-way valve 29 is turned on, the AC end of the third proportional three-way valve 28 is turned on, the AB end of the fourth proportional three-way valve 27 is turned on, the BC end of the fifth proportional three-way valve 15 is turned on, and the AC end of the sixth proportional three-way valve 16 is turned on, and the nine-way valve 11 switches to mode 1, completing the coolant circuit circulation of the heat pump system; Cab heat pump heating mode: the second compressor 38 is started, the second regenerator bypass valve 35 is turned on, and the refrigerant circuit circulation is completed; the third water pump 36 and the fourth water pump 30 are started, the AB end of the first proportional three-way valve 10 is turned on, the AC end of the second proportional three-way valve 29 is turned on, the AB end of the third proportional three-way valve 28 is turned on, the BC end of the fourth proportional three-way valve 27 is turned on, the BC end of the fifth proportional three-way valve 15 is turned on, and the AC end of the sixth proportional three-way valve 16 is turned on, and the nine-way valve 11 switches to mode 2 to complete the coolant circuit circulation of the cab heat pump system; Cab PTC heating mode: the second compressor 38 is turned off, and the cab heat pump system refrigerant circuit circulation is turned off; the third water pump 36 is started, the cab heating PTC is started, the AB end of the third proportional three-way valve 28 is turned on, the BC end of the fourth proportional three-way valve 27 is turned on, and the nine-way valve 11 switches to mode 2, completing the cab coolant circuit circulation; Cab defrosting mode: In cab PTC heating mode, the fan changes the wind direction to heat the windshield for defrosting; In cab heat pump heating mode, the fan changes the wind direction to heat the windshield for defrosting; Cab defog mode: the second compressor 38 is started, the second regenerator bypass valve 35 is closed, and the refrigerant circuit circulation of the cab heat pump system is completed; the third water pump 36 and the fourth water pump 30 are started, the cab heating PTC is started, the AB end of the second proportional three-way valve 29 is connected, the AC end of the third proportional three-way valve 28 is connected, the AB end of the fourth proportional three-way valve 27 is connected, the BC end of the fifth proportional three-way valve 15 is connected, and the AC end of the sixth proportional three-way valve 16 is connected, and the nine-way valve 11 switches to mode 1 to complete the coolant circuit circulation of the cab heat pump system.

[0043] The front-end heat dissipation module includes a first radiator 17, a second radiator 18, a sixth proportional three-way valve 16, a seventh proportional three-way valve 19, a cooling fan 20, a fifth water pump 21, and a motor 22; In the front-end heat dissipation module, the C port of the sixth proportional three-way valve 16 is connected to the first radiator 17, the B port of the sixth proportional three-way valve 16 is connected to the C port of the seventh proportional three-way valve 19 through the second radiator 18, the B port of the sixth proportional three-way valve 16 is connected to the motor 22 through the fifth water pump 21, the outlet of the motor 22 is connected to the B port of the seventh proportional three-way valve 19, the outlet of the first radiator 17 is connected to the A port of the seventh proportional three-way valve 19 and then to the D port of the nine-way valve 11, a cooling fan 20 is provided at the second radiator 18, and the A port of the sixth proportional three-way valve 16 is connected to the B port of the fifth proportional three-way valve 15 of the battery heat pump system.

[0044] The front-end cooling module has independent mode and parallel mode: Front-end heat dissipation module independent mode: the AC port of the sixth proportional three-way valve 16 is connected, the B port is closed, the BC port of the seventh proportional three-way valve 19 is connected, the A port is closed, the motor coolant is independently circulated and liquid-cooled through the fifth water pump 21, the motor 22, the seventh proportional three-way valve 19 and the second radiator 18, and the coolant of the heat pump integrated module is heat-exchanged with the air through the first radiator 17; Front-end heat dissipation module parallel mode: the ABC ports of the sixth proportional three-way valve 16 are connected for proportional distribution, the AB ports of the seventh proportional three-way valve 19 are connected, and the C port is closed. The coolant of the heat pump integrated module passes through the B port of the sixth proportional three-way valve 16, the fifth water pump 21 and the motor 22 for heat exchange. At the same time, the coolant of the heat pump integrated module passes through the C port of the sixth proportional three-way valve 16 and the first radiator 17 for heat exchange with the air.

[0045] The air conditioning box includes a cold air core 24, a warm air core 25 and a fan 26; In the air conditioning box, the cold air core 24 and the warm air core 25 are connected in series, and the wind blown out by the fan 26 passes through the warm air core 25 and the cold air core 24 in sequence.

[0046] The system also includes a first expansion kettle 40, a second expansion kettle 39 and a third expansion kettle 41; the water supply port of the first expansion kettle 40 is connected to the inlet of the second water pump 9 through a pipeline, and the exhaust port of the first expansion kettle 40 is connected to the outlet of the first evaporator 5; the water supply port of the second expansion kettle 39 is connected to the inlet of the fourth water pump 30 through a pipeline, and the exhaust port of the second expansion kettle 39 is connected to the outlet of the second evaporator 31; the water supply port of the third expansion kettle 41 is connected to the inlet of the fifth water pump 21 through a pipeline, and the exhaust port of the third expansion kettle 41 is connected to the second radiator 18.

[0047] The battery heat pump system and the cab heat pump system are both isolated from the cab; the battery heat pump system refrigerant circuit and the cab heat pump system refrigerant circuit are completely independent and can be operated separately; the cab module is combined with the cab inlet parallel module, and the coolant is divided through the eighth proportional three-way valve 42 and passes through the cold air core 24, the cab heating PTC 23 and the warm air core 25 respectively, and the coolant is combined through the ninth proportional three-way valve 43, which can improve the heat exchange performance of the cab. The battery heat pump system coolant circuit and the cab heat pump system coolant circuit are divided through the first proportional three-way valve 10, the fourth proportional three-way valve 27, and the nine-way valve 11, and the battery heat pump system coolant circuit and the cab heat pump system coolant circuit are combined through the fifth proportional three-way valve 15 and the nine-way valve 11. When the motor temperature is low, the front-end heat dissipation module switches to parallel mode, and the coolant flows through the motor to lower the temperature. When the motor temperature is high, the front-end heat dissipation module switches to independent mode, and the motor dissipates heat through self-circulation. When the motor temperature is high and the battery has a heating request, the motor waste heat is recovered to heat the battery, reducing the battery heating PTC power consumption and the first compressor energy consumption.

[0048] Based on the 5 working modes of the cab heat pump system, the 4 working modes of the battery heat pump system, and the 2 working modes of the front-end heat dissipation module under different working conditions, the CO2 indirect heat pump system suitable for electric commercial vehicles proposed in the present invention has 25 working modes, as shown in the following table:

[0049] See also Figure 2 In the embodiment of the present invention, a front-end heat dissipation module of a CO2 indirect heat pump system suitable for an electric commercial vehicle has an independent mode cab and a battery heat pump heating mode. The first compressor 1 and the second compressor 38 are started, the first regenerator bypass valve 7 and the second regenerator bypass valve 35 are turned on, and the refrigerant circuit circulation is completed. The high-temperature refrigerant passes through the first gas cooler 2 and the second gas cooler 37 to heat the coolant, and the low-temperature refrigerant passes through the first evaporator 5 and the second evaporator 31 to reduce the coolant temperature; the first water pump 8, the second water pump 9, the third water pump 36, and the fourth water pump 30 are started, the four-way valve 12 switches to mode 2, and the nine-way valve 11 switches to mode 2; the low-temperature coolant of the battery heat pump system flows through the BC end of the four-way valve 12 into the A end of the fifth proportional three-way valve 15, and the low-temperature coolant of the cab heat pump system flows through the AE end of the nine-way valve 11 into the C end of the fifth proportional three-way valve 15. After the confluence, the coolant passes through the AC end of the sixth proportional three-way valve 16 through the first radiator 17 to exchange heat with the air, and passes through the nine-way valve 11 The DG end flows into the first proportional three-way valve 10 for diversion, and the BA end of the first proportional three-way valve 10 flows into the fourth water pump 30 through the AC end of the second proportional three-way valve 29 to complete the low-temperature coolant circulation of the cab heat pump system. The BC end of the first proportional three-way valve 10 flows into the second water pump 9 to complete the low-temperature coolant circulation of the battery heat pump system; the high-temperature coolant of the battery heat pump system flows into the power battery 14 through the AD end of the four-way valve 12, and after completing the heat exchange with the battery 14, flows into the first water pump 8 through the FH end of the nine-way valve 11; the high-temperature coolant of the cab heat pump system passes through the IC end of the nine-way valve 11 and enters the cold air core 24 and the warm air core 25 in turn, and then flows into the third water pump 36 through the BC end of the fourth proportional three-way valve 27 and the AB end of the third proportional three-way valve 28 to complete the high-temperature coolant circulation of the cab heat pump system; the motor circuit coolant passes through the fifth water pump 21, the motor 22, the BC end of the seventh proportional three-way valve 19, and the second radiator 18 in turn to complete the circulation and reduce the motor temperature.

[0050] See also Figure 3In the embodiment of the present invention, a cab and battery heat pump heating mode in the parallel mode of the front-end heat dissipation module of a CO2 indirect heat pump system suitable for an electric commercial vehicle, the first compressor 1 and the second compressor 38 are started, the first regenerator bypass valve 7 and the second regenerator bypass valve 35 are turned on, and the refrigerant circuit circulation is completed. The high-temperature refrigerant passes through the first gas cooler 2 and the second gas cooler 37 to heat the coolant, and the low-temperature refrigerant passes through the first evaporator 5 and the second evaporator 31 to reduce the coolant temperature; the first water pump 8, the second water pump 9, the third water pump 36, and the fourth water pump 30 are started, the four-way valve 12 switches to mode 2, and the nine-way valve 11 switches to mode 2; the low-temperature coolant of the battery heat pump system flows through the BC end of the four-way valve 12 into the A end of the fifth proportional three-way valve 15, and the low-temperature coolant of the cab heat pump system flows through the AE end of the nine-way valve 11 into the C end of the fifth proportional three-way valve 15. After the confluence, part of the coolant passes through the C end of the sixth proportional three-way valve 16 to complete heat exchange with the air through the first radiator 17, and part of the coolant passes through the sixth proportional three-way valve 16 The B end absorbs the residual heat of the motor through the fifth water pump 21, the motor 22, and the AB end of the seventh proportional three-way valve 19, and then flows into the first proportional three-way valve 10 through the DG end of the nine-way valve 11 for diversion, and flows into the fourth water pump 30 through the AC end of the second proportional three-way valve 29 to complete the low-temperature coolant circulation of the cab heat pump system, and flows into the second water pump 9 through the BC end of the first proportional three-way valve 10 to complete the low-temperature coolant circulation of the battery heat pump system; the high-temperature coolant of the battery heat pump system flows into the power battery 14 through the AD end of the four-way valve 12, and after completing the heat exchange with the battery 14, flows into the first water pump 8 through the FH end of the nine-way valve 11; the high-temperature coolant of the cab heat pump system enters the cold air core 24 and the warm air core 25 in turn through the IC end of the nine-way valve 11, and then flows into the third water pump 36 through the BC end of the fourth proportional three-way valve 27 and the AB end of the third proportional three-way valve 28 to complete the high-temperature coolant circulation of the cab heat pump system.

[0051] See also Figure 4In the embodiment of the present invention, a cab cooling and battery forced cooling mode of a CO2 indirect heat pump system suitable for an electric commercial vehicle is implemented. The first compressor 1 and the second compressor 38 are started, the first regenerator bypass valve 7 and the second regenerator bypass valve 35 are closed, and the refrigerant circuit circulation is completed. The high-temperature refrigerant passes through the first gas cooler 2 and the second gas cooler 37 to heat the coolant, and the low-temperature refrigerant passes through the first evaporator 5 and the second evaporator 31 to reduce the coolant temperature; the first water pump 8, the second water pump 9, the third water pump 36, and the fourth water pump 30 are started, the four-way valve 12 switches to mode 1, and the nine-way valve 11 switches to mode 1; the low-temperature coolant of the battery heat pump system flows into the power battery 14 through the CD end of the four-way valve 12 to reduce the battery temperature, and then passes through the GF end of the nine-way valve 11 and the first proportional three-way valve 10 The BC end flows into the second water pump 9 to complete the low-temperature coolant circulation of the battery heat pump system; the low-temperature coolant of the cab heat pump system passes through the AC end of the nine-way valve 11 and enters the cold air core 24 and the warm air core 25 in turn to reduce the temperature of the cab, and then flows into the fourth water pump 30 through the AB end of the fourth proportional three-way valve 27 and the AB end of the second proportional three-way valve 29 to complete the low-temperature coolant circulation of the cab heat pump system; the high-temperature coolant of the battery heat pump system passes through the AB end of the four-way valve 12 and flows into the A end of the fifth proportional three-way valve 15. The high-temperature coolant of the cab heat pump system passes through the IE end of the nine-way valve 11 and flows into the C end of the fifth proportional three-way valve 15. After merging, the high-temperature coolant passes through the AC end of the sixth proportional three-way valve 16 to exchange heat with the first radiator 17. Part of the coolant flows into the first water pump 8 through the DH end of the nine-way valve 11 to complete the high-temperature coolant circulation of the battery heat pump system. Part of the coolant passes through the DB end of the nine-way valve 11 and the third proportional three-way valve 28 The AC end flows into the third water pump 36 to complete the high-temperature coolant circulation of the cab heat pump system; the motor circuit coolant passes through the fifth water pump 21, the motor 22, the BC end of the seventh proportional three-way valve 19, and the second radiator 18 in sequence to complete the circulation and reduce the motor temperature.

[0052] See also Figure 5 In an embodiment of the present invention, a battery self-circulation heat dissipation mode of a CO2 indirect heat pump system suitable for an electric commercial vehicle is used. The second water pump 9 is started, the four-way valve 12 switches to mode 1, and the nine-way valve 11 switches to mode 1. The coolant flows through the second water pump 9, the second evaporator 5, and the CD end of the four-way valve 12 into the power battery 14 for heat exchange to reduce the battery temperature. Then, it flows into the second water pump 9 through the FG end of the nine-way valve 11 and the BC end of the first proportional three-way valve 10 to complete the self-circulation of the coolant in the battery heat pump system.

[0053] See also Figure 6In an embodiment of the present invention, a CO2 indirect heat pump system for electric commercial vehicles is used to heat the battery with waste heat from the motor. The first water pump 8, the second water pump 9, and the fifth water pump 21 are started. The coolant flows into the power battery 14 through the first water pump 8 and the AD end of the four-way valve 12 for heat exchange, flows into the second water pump 9 through the GF end of the nine-way valve 11 and the BC end of the first proportional three-way valve 10, flows into the motor 22 through the BC end of the four-way valve 12, the AB end of the fifth proportional three-way valve 15, the AB end of the sixth proportional three-way valve 16, and the fifth water pump 21, absorbs the waste heat from the motor 22, and flows into the first water pump 8 through the AB end of the seventh proportional three-way valve 19 and the DH end of the nine-way valve 11 after the heat exchange is completed, completing the coolant circulation of the battery heat pump system and heating the battery with the waste heat from the motor. See also Figure 7 In the embodiment of the present invention, a CO2 indirect heat pump system for electric commercial vehicles is used in the cab demisting mode. The second compressor 38 is started to complete the refrigerant circuit circulation; the third water pump 36 and the fourth water pump 30 are started, the cab heating PTC 23 is started, and the nine-way valve 11 switches to mode 1; the high-temperature coolant of the cab heat pump system flows into the third water pump 36 through the IE end of the nine-way valve 11, the BC end of the fifth proportional three-way valve 15, the AC end of the sixth proportional three-way valve 16, the first radiator 17, the BD end of the nine-way valve 11, and the AC end of the third proportional three-way valve 28 to exchange heat with the high-temperature refrigerant; the low-temperature coolant of the cab low-temperature heat pump system passes through the second evaporator 31 and the AC end of the nine-way valve 11 into the cold air core 24, and the low-temperature coolant flowing out of the cold air core 24 passes through the cab heating PTC 23 and enters the warm air core 25 to exchange heat with the cab, and then the high-temperature coolant passes through the AB end of the fourth proportional three-way valve 27, the second proportional three-way valve 29 The AB end and the fourth water pump 30 enter the second evaporator 31 to complete the low-temperature coolant circulation; See also Figure 8In an embodiment of the present invention, a CO2 indirect heat pump system suitable for an electric commercial vehicle realizes a cab cooling mode through a cab inlet parallel module, a second compressor 38 is started, and a second heat exchanger bypass valve 35 is closed to complete the refrigerant circuit circulation; the high-temperature coolant passes through the IE end of the nine-way valve 11, the BC end of the fifth proportional three-way valve 15, and the AC end of the sixth proportional three-way valve 16 to exchange heat with the first radiator 17, and passes through the DB end of the nine-way valve 11 and the AC end of the third proportional three-way valve 28 to flow into the third water pump 36 to complete the high-temperature coolant circulation of the cab heat pump system; the low-temperature coolant passes through the second evaporator 31 and the AC end of the nine-way valve 11 and is diverted through the eighth proportional three-way valve 42, part of the coolant passes through the AB end to flow into the cold air core 24 for heat exchange and then passes through the AC end of the ninth proportional three-way valve 43, and part of the coolant passes through the AC end of the eighth proportional three-way valve 42 to flow into the warm air core 25 for heat exchange and then passes through the AB end of the ninth proportional three-way valve 43, and the two parts of the coolant merge through the ninth proportional three-way valve 43, and then pass through the fourth proportional three-way valve 27 The AB end, the AB end of the second proportional three-way valve 29 and the fourth water pump 30 return to the inlet of the second evaporator 31 to complete the low-temperature coolant circulation of the cab heat pump module.

[0054] In summary, the embodiment of the present invention discloses a CO2 indirect heat pump system suitable for electric commercial vehicles, including: a battery heat pump system and a cab heat pump system with independent refrigerant circuits, a front-end heat dissipation module operating in parallel and independent modes, a multi-way valve combination, and a cab module. The proposed system can realize 25 working modes such as motor waste heat utilization, cab heating, defrosting, defogger, battery forced cooling, heating, and self-circulation heat dissipation, solving the problems of flow distribution of integrated cooling system, high dependence on electric heating, and poor heating performance of R134a heat pump in low temperature conditions, and provides an efficient, reliable, and safe thermal management technology solution for electric vehicles equipped with high energy density and high output power batteries. The heat pump system includes a battery heat pump system and a cab heat pump system with independent refrigerant circuits, which efficiently meet the battery temperature control and cab comfort control requirements; the CO2 indirect heat pump integrated module is isolated from the cab, effectively improving the safety of the thermal management system; the front-end heat dissipation module independent mode realizes the self-circulation heat dissipation of the motor, and the parallel mode can realize the motor waste heat heating the battery, effectively reducing the energy consumption of the compressor and the electric heating PTC; through the cab inlet parallel module, the coolant enters the cab cold air core and the warm air core respectively, increasing the cab heat exchange; the low-temperature coolant flows into the warm air core 25, and the cab electric heating PTC 23 is started, which is suitable for the cab defog mode. The present invention is aimed at electric commercial vehicles equipped with high energy density and high output power power batteries, solves the problems of integrated cooling system flow distribution, excessive dependence on electric heating, and poor heating performance of R134a heat pumps under low temperature conditions, promotes the application and popularization of CO2 heat pump systems, promotes the low-carbon and sustainable development of the freight industry, and makes significant contributions to environmental protection, alleviating the fossil energy crisis, and achieving carbon neutrality and carbon peak.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A CO2 indirect heat pump system, characterized in that: Includes battery heat pump system, cab heat pump system, front end cooling module and cab module; The battery heat pump system is used to control the battery temperature in an electric commercial vehicle; The cab heat pump system is used to control the cab temperature of an electric commercial vehicle; The front-end heat dissipation module is used to realize the heat pump system's cyclic heat dissipation and heat absorption; The cab module is used to adjust the amount of heat exchange in the cab; Among them, the first port of the battery heat pump system is connected to the first port of the cab heat pump system, the second port of the battery heat pump system is connected to the first port of the front end heat dissipation module, the second port of the front end heat dissipation module is connected to the second port of the cab heat pump system, and the third port of the cab heat pump system is connected to the cab module.

2. The CO2 indirect heat pump system according to claim 1, characterized in that: The battery heat pump system comprises a battery heat pump system refrigerant circuit and a battery heat pump system coolant circuit; the battery heat pump system refrigerant circuit comprises a first compressor (1), a first gas cooler (2), a first regenerator (3), a first throttle valve (4), a first evaporator (5), a first gas-liquid separator (6) and a first regenerator bypass valve (7); the battery heat pump system coolant circuit comprises a first water pump (8), a four-way valve (12), a battery heating PTC (13), a second water pump (9), a first proportional three-way valve (10) and a fifth proportional three-way valve (15); The outlet of the first compressor (1) is connected to the refrigerant inlet of the first gas cooler (2), the outlet of the first gas cooler (2) is connected to the inlet of the first evaporator (5) through the first pipeline of the first regenerator (3), the outlet of the first evaporator (5) is connected to the second pipeline of the first regenerator (3) through the first gas-liquid separator (6), and the outlet of the second pipeline is connected to the inlet of the first compressor (1); a first regenerator bypass valve (7) is provided between the outlet of the first gas-liquid separator (6) and the inlet of the first compressor (1); The outlet of the first water pump (8) is connected to the A port of the four-way valve (12), the D port of the four-way valve (12) is connected to the coolant inlet of the power battery (14) through the battery heating PTC (13), the coolant outlet of the power battery (14) is connected to the F port of the nine-way valve (11), the H port of the nine-way valve (11) is connected to the inlet of the first water pump (8), the C port of the first proportional three-way valve (10) is connected to the inlet of the second water pump (9), the outlet of the second water pump (9) is connected to the C port of the four-way valve (12) through the first evaporator (5), the B port of the four-way valve (12) is connected to the A port of the fifth proportional three-way valve (15), the B port of the fifth proportional three-way valve (15) is connected to the front-end heat dissipation module, the C port of the fifth proportional three-way valve (15) is connected to the E port of the nine-way valve (11), the B port of the first proportional three-way valve (10) is connected to the G port of the nine-way valve (11); the A port of the first proportional three-way valve (10) is connected to the cab heat pump system.

3. The CO2 indirect heat pump system according to claim 1, characterized in that: Also included is an air conditioning box, the air conditioning box comprising a cold air core (24), a warm air core (25) and a fan (26); The cold air core (24) is connected in series with the warm air core (25), and the air blown out by the fan (26) passes through the warm air core (25) and the cold air core (24) in sequence.

4. The CO2 indirect heat pump system according to claim 3, characterized in that: The cab heat pump system comprises a cab heat pump system refrigerant circuit and a cab heat pump system coolant circuit; the cab heat pump system refrigerant circuit comprises a second compressor (38), a second gas cooler (37), a second regenerator (34), a second throttle valve (33), a second evaporator (31), a second gas-liquid separator (32) and a second regenerator bypass valve (35); the cab heat pump system coolant circuit comprises a third water pump (36), a cab heating PTC (23), a fourth proportional three-way valve (27), a third proportional three-way valve (28), a fourth water pump (30) and a second proportional three-way valve (29); The outlet of the second compressor (38) is connected to the refrigerant inlet of the second gas cooler (37); the outlet of the second gas cooler (37) is connected to the inlet of the second evaporator (31) via the first pipeline of the second regenerator (34); the outlet of the second evaporator (31) is connected to the second pipeline of the second regenerator (34) via the second gas-liquid separator (32); the outlet of the second pipeline is connected to the inlet of the second compressor (38); a second regenerator bypass valve (35) is provided between the outlet of the second gas-liquid separator (32) and the inlet of the second compressor (38); The outlet of the third water pump (36) is connected to the I port of the nine-way valve (11), the C port of the fourth proportional three-way valve (27) is connected to the B port of the third proportional three-way valve (28), the A port of the third proportional three-way valve (28) is connected to the inlet of the third water pump (36), the C port of the third proportional three-way valve (28) is connected to the B port of the nine-way valve (11), the A port of the fourth proportional three-way valve (27) is connected to the B port of the second proportional three-way valve (29), the A port of the second proportional three-way valve (29) is connected to the second evaporator (31) through the fourth water pump (30), the outlet of the second evaporator (31) is connected to the A port of the nine-way valve (11), the C port of the second proportional three-way valve (29) is connected to the battery heat pump system, and the B port of the fourth proportional three-way valve (27) is connected to the cab module.

5. The CO2 indirect heat pump system according to claim 3, characterized in that: When the cab module is an inlet parallel module, the inlet parallel module comprises a cab heating PTC (23), an eighth proportional three-way valve (42) and a ninth proportional three-way valve (43); The A port of the eighth-proportional three-way valve (42) is connected to the C port of the nine-way valve (11), the B port of the eighth-proportional three-way valve (42) is connected to the inlet of the cold air core (24), the C port of the eighth-proportional three-way valve (42) is connected to the cab heating PTC (23), the B port of the ninth-proportional three-way valve (43) is connected to the outlet of the warm air core (25), the C port of the ninth-proportional three-way valve (43) is connected to the outlet of the cold air core (24), and the A port of the ninth-proportional three-way valve (43) is connected to the cab heat pump system.

6. The CO2 indirect heat pump system according to claim 3, characterized in that: When the cab module is an inlet series module, the inlet series module includes a cab heating PTC (23); The C port of the nine-way valve (11) is connected to the inlet of the cold air core (24), and the outlet of the cold air core (24) is connected to the warm air core (25) through the cab PTC (23), and the warm air core (25) is connected to the cab heat pump system.

7. The CO2 indirect heat pump system according to claim 1, characterized in that: The front-end heat dissipation module comprises a first radiator (17), a second radiator (18), a sixth proportional three-way valve (16), a seventh proportional three-way valve (19), a cooling fan (20), a fifth water pump (21) and a motor (22); The C port of the sixth proportional three-way valve (16) is connected to the first radiator (17), the B port of the sixth proportional three-way valve (16) is connected to the C port of the seventh proportional three-way valve (19) through the second radiator (18), the B port of the sixth proportional three-way valve (16) is connected to the motor (22) through the fifth water pump (21), the outlet of the motor (22) is connected to the B port of the seventh proportional three-way valve (19), the outlet of the first radiator (17) is connected to the A port of the seventh proportional three-way valve (19) and then to the D port of the nine-way valve (11), a cooling fan (20) is provided at the second radiator (18), and the A port of the sixth proportional three-way valve (16) is connected to the battery heat pump system.

8. The CO2 indirect heat pump system according to claim 7, characterized in that: Front-end cooling module in standalone mode: The A port and the C port of the sixth proportional three-way valve (16) are connected, and the B port is closed. The B port and the C port of the seventh proportional three-way valve (19) are connected, and the A port is closed. The motor coolant is independently circulated and liquid-cooled through the fifth water pump (21), the motor (22), the seventh proportional three-way valve (19) and the second radiator (18). The coolant exchanges heat with the air through the first radiator (17).

9. The CO2 indirect heat pump system according to claim 7, characterized in that: Front-end cooling modules in parallel mode: The A port, B port and C port of the sixth proportional three-way valve (16) are all connected for proportional distribution, the A port and B port of the seventh proportional three-way valve (19) are connected, and the C port is closed. The coolant passes through the B port of the sixth proportional three-way valve (16) and the fifth water pump (21) to perform heat exchange with the motor (22), and at the same time, the coolant passes through the C port of the sixth proportional three-way valve (16) and the first radiator (17) to perform heat exchange with the air.

10. An electric commercial vehicle, characterized in that: A CO2 indirect heat pump system as described in any one of claims 1 to 9 is adopted.

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