Thermal management system and hybrid electric vehicle

Abstract

The invention belongs to the technical field of thermal management of automobiles, and relates to a thermal management system and a hybrid electric vehicle, the thermal management system comprises a heat pump air conditioner module, a warm air heating module, a battery pack heat dissipation module, an engine heat dissipation module, an electric heat dissipation module, and a seven-way valve and a four-way valve which are connected with the modules. According to the heat management system of the hybrid electric vehicle, the heat pump air conditioner module, the warm air heating module, the battery pack heat dissipation module, the engine heat dissipation module and the electric drive heat dissipation module are integrally arranged, the structure of the structure is simple, and waste heat of an engine part and an electric drive part can be reasonably recycled and utilized through twelve working modes; and a low-temperature use scene is effectively dealt with. The thermal management system can efficiently manage the heat of the engine, the electric drive and the battery pack, and the working efficiency is improved.

Description

Technical Field

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

[0002] With the development of new energy vehicles, the thermal management system of vehicles has become more and more sophisticated. Especially in hybrid vehicles, the thermal management system includes heat pump air conditioning module, warm air heating module, battery pack cooling module, engine cooling module and electric drive cooling module, etc. The structural integration of multiple modules is low, the overall architecture is very complex, and it cannot effectively cope with low temperature environments. Summary of the invention

[0003] Based on this, the present invention provides a thermal management system and a hybrid vehicle. The thermal management system has a high degree of integration and can reasonably utilize the waste heat of the engine part and the electric drive part to cope with low-temperature usage scenarios.

[0004] According to an embodiment of the present invention, a first aspect provides a thermal management system, including a heat pump air conditioning module, a warm air heating module, a battery pack cooling module, an engine cooling module, an electric drive cooling module, and a seven-way valve and a four-way valve connecting the aforementioned modules;

[0005] The heat pump air conditioning module includes a compressor, a water-cooled condenser, a first expansion valve, an external condenser, a drying bottle, a second expansion valve and a passenger compartment evaporator connected in series; the water-cooled condenser specifically includes a first refrigerant inlet end, a first refrigerant outlet end, a first coolant inlet end and a first coolant outlet end; the first refrigerant outlet end is provided with a first bypass pipe connected to the first refrigerant outlet end of the external condenser, and a switch valve is arranged on the first bypass pipe; the outlet end of the drying bottle is provided with a second bypass pipe connected to the inlet end of the compressor, and the second bypass pipe is provided with a third expansion valve and a first heat exchanger; the first heat exchanger includes a second refrigerant inlet end, a second refrigerant outlet end, a second coolant inlet end and a second coolant outlet end, the second refrigerant inlet end is connected to the outlet end of the third expansion valve, and the outlet end of the second refrigerant is connected to the inlet end of the compressor; the second coolant inlet end is connected to the sixth valve port of the seven-way valve, and the second coolant outlet end is connected to the seventh valve port of the seven-way valve;

[0006] The warm air heating module comprises a first water pump and a warm air core connected in series, the warm air core is integrated with a PTC heater, the liquid inlet end of the first water pump is connected to the second liquid outlet end of the water-cooled condenser, and the liquid outlet end of the warm air core is connected to the fourth valve port of the four-way valve;

[0007] The battery pack heat dissipation module includes a battery cold plate, a second heat exchanger and a second water pump connected in series, the liquid inlet end of the battery cold plate is connected to the fourth valve port of the seven-way valve, and the liquid outlet end of the second water pump is connected to the fifth valve port of the seven-way valve;

[0008] The engine cooling module comprises a third water pump, an engine cylinder block, an engine cylinder head, an electronic thermostat and a first radiator connected in series, the liquid outlet of the first radiator is connected to the liquid inlet of the third water pump, a third bypass pipe is arranged between the engine cylinder head and the electronic thermostat and connected to the liquid inlet of the first water pump, and an exhaust gas heat exchanger is arranged on the third bypass pipe; the second valve port of the four-way valve is connected to the inlet of the third water pump, and a supercharger is arranged between the engine cylinder block and the electronic thermostat;

[0009] The electric drive heat dissipation module includes a fourth water pump, an electronic control component, an intercooler and a motor component connected in series, the liquid inlet end of the fourth water pump is connected to the first valve port of the seven-way valve, and the liquid outlet end of the motor component is connected to the second valve port of the seven-way valve; a fourth bypass pipe is arranged at the outlet end of the motor assembly to be connected to the third valve port of the seven-way valve, and a second radiator is arranged on the fourth bypass pipe.

[0010] In some embodiments, the thermal management system includes five operating modes in pure electric driving conditions:

[0011] Mode 1 is applied to pure electric driving conditions in low temperature environments. When the passenger compartment is heated and the battery pack is heated, the switch valve in the heat pump air conditioning module is opened, the first valve port, the third valve port and the fourth valve port of the four-way valve are opened, the first valve port of the seven-way valve is connected to the seventh valve port, the second valve port is connected to the sixth valve port, the fourth valve port is connected to the fifth valve port, and the third valve port is closed;

[0012] Mode 2 is applied to pure electric driving conditions in low temperature environments. When the battery pack is heated, the heat pump air conditioning module is closed, the first valve port of the seven-way valve is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed;

[0013] Mode 3 is applied to pure electric driving conditions in low temperature environments. When the electric drive cooling module is insulated, the heat pump air conditioning module is closed, the first valve port of the seven-way valve is connected to the second valve port, the fifth valve port is connected to the sixth valve port, the fourth valve port is connected to the seventh valve port, and the third valve port is closed;

[0014] Mode 4 is applied to pure electric driving conditions under normal temperature. When the battery pack selectively dissipates heat according to the temperature of the battery cell, the heat pump air conditioning module is closed, the first valve port of the seven-way valve is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the fourth valve port is connected to the second valve port, or the fourth valve port is connected to the third valve port.

[0015] Mode five is applied to pure electric driving conditions in high temperature environments. When the passenger compartment is cooled and the battery pack is dissipating heat, the switch valve of the heat pump air-conditioning module is closed, the first valve port of the seven-way valve is connected to the third valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the second valve port is closed.

[0016] In some embodiments, the thermal management system further includes seven operating modes in pure hybrid driving conditions:

[0017] Mode 6 is applied to hybrid driving conditions in low temperature environments. When the battery pack is heated, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned on, the first valve port, the third valve port and the fourth valve port of the four-way valve are opened, and the second valve port is closed. The first valve port of the seven-way valve is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed.

[0018] Mode 7 is applied to hybrid driving conditions in low temperature environments. When the passenger compartment is heated and the battery pack is heated, the switch valve of the heat pump air conditioning module is opened, the PTC heater in the warm air heating module is closed, the first valve port, the third valve port and the fourth valve port of the four-way valve are opened, and the second valve port is closed. The first valve port of the seven-way valve is connected to the seventh valve port, the second valve port is connected to the sixth valve port, the fourth valve port is connected to the fifth valve port, and the third valve port is closed.

[0019] Mode 8 is applied to hybrid driving conditions in low temperature environments. When the passenger compartment is heated and the battery pack is heated, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port and the fourth valve port of the four-way valve are opened, the first valve port and the third valve port are closed, the first valve port of the seven-way valve is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed;

[0020] Mode nine is applied to hybrid driving conditions in low temperature environments. When the battery pack is heated, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port and the third valve port of the four-way valve are opened, the first valve port and the fourth valve port are closed, the first valve port of the seven-way valve is connected to the second valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed;

[0021] Mode 10 is applied to hybrid driving conditions in low temperature environments. When the passenger compartment is heated and the battery pack is heated, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port, the third valve port and the fourth valve port of the four-way valve are opened, and the first valve port is closed; the first valve port of the seven-way valve is connected to the second valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed;

[0022] Mode 11 is applied to hybrid driving conditions under normal temperature. When the battery pack and the electric drive cooling module are dissipating heat, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port and the fourth valve port of the four-way valve are opened, and the first valve port and the third valve port are closed. The first valve port of the seven-way valve is connected to the seventh valve port, the second valve port or the third valve port is selectively connected to the fourth valve port, and the fifth valve port is connected to the sixth valve port.

[0023] Mode twelve is applied to hybrid driving conditions in high temperature environments. When the passenger compartment is cooled and the battery pack is dissipating heat, the switch valve of the heat pump air-conditioning module is closed, the PTC heater in the warm air heating module is turned off, the second valve port and the fourth valve port of the four-way valve are opened, and the first valve port and the third valve port are closed, the first valve port of the seven-way valve is connected to the third valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the second valve port is closed.

[0024] In some embodiments, the temperature of the normal temperature environment is 20-25°C.

[0025] In some embodiments, in the mode 2, the mode 6 and the mode 8, the temperature of the coolant in the electric drive heat dissipation module is 5° C. higher than the lowest temperature of the battery cells in the battery pack heat dissipation module.

[0026] In some embodiments, in the sixth mode and the seventh mode, the temperature of the coolant in the engine cooling module is less than 40°C.

[0027] In some embodiments, in the mode nine, the mode ten and the mode eleven, the temperature of the coolant in the engine cooling module is not less than 40°C.

[0028] In some embodiments, the external condenser, the first radiator and the second radiator are centrally arranged and dissipate heat through a fan, the first radiator is arranged close to the fan, and the second radiator and the external condenser are successively away from the fan.

[0029] In some embodiments, the engine cooling module also includes an expansion pot, a fluid filling port of the expansion pot is connected to the fluid inlet end of the third water pump, a first degassing pipe is arranged on the first radiator and connected to the expansion pot, and a second degassing pipe is arranged on the engine cylinder head and connected to the expansion pot.

[0030] According to an embodiment of the present invention, a second aspect provides a hybrid vehicle, in which the aforementioned thermal management system is configured.

[0031] In the hybrid vehicle thermal management system of the present invention, the heat pump air conditioning module, the warm air heating module, the battery pack cooling module, the engine cooling module and the electric drive cooling module are integrated and arranged, and the structure of the architecture is simple, and the waste heat of the engine and the electric drive can be reasonably recovered and utilized to effectively cope with low temperature usage scenarios. The thermal management system can efficiently manage the heat of the engine, electric drive and battery pack, and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of the thermal management system of this embodiment in mode 1;

[0033] Figure 2 is a schematic diagram of the structure of the thermal management system of this embodiment in mode 2;

[0034] Figure 3 is a schematic diagram of the structure of the thermal management system of this embodiment in mode three;

[0035] Figure 4 is a schematic structural diagram of the thermal management system of this embodiment in mode 4;

[0036] Figure 5 is a schematic diagram of the structure of the thermal management system of this embodiment in mode five;

[0037] Figure 6 is a schematic diagram of the structure of the thermal management system of this embodiment in mode 6;

[0038] Figure 7 is a schematic diagram of the structure of the thermal management system of this embodiment in mode seven;

[0039] Figure 8 is a schematic structural diagram of the thermal management system of this embodiment in mode eight;

[0040] Fig. 9 is a schematic structural diagram of the thermal management system of this embodiment in mode nine;

[0041] Fig.10 is a schematic structural diagram of the thermal management system of this embodiment in mode ten;

[0042] Fig.11 is a schematic structural diagram of the thermal management system of this embodiment in mode 11;

[0043] Fig.12 is a schematic diagram of the structure of the thermal management system of this embodiment in mode 12;

[0044] Fig.13 It is a structural schematic diagram of the centralized arrangement of the external condenser, the first radiator and the second radiator.

[0045] In the figure: compressor 10; water-cooled condenser 11; first expansion valve 12; external condenser 13; drying bottle 14; second expansion valve 15; passenger compartment evaporator 16; switch valve 17; third expansion valve 18; first heat exchanger 19; heater core 20; first water pump 21; battery cold plate 30, second heat exchanger 31; second water pump 32; engine block 40; engine cylinder head 41; electronic thermostat 42; first radiator 43; third water pump 44; supercharger 45; expansion pot 46; electronic control component 50; intercooler 51; motor component 52; fourth water pump 53, second radiator 54; seven-way valve 60; four-way valve 70; fan 80. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0048] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0049] Embodiment 1

[0050] like Figure 1-12 As shown, this embodiment provides a thermal management system configured in a hybrid vehicle, which includes a heat pump air conditioning module, a warm air heating module, a battery pack cooling module, an engine cooling module, an electric drive cooling module, and a seven-way valve 60 and a four-way valve 70 connecting the aforementioned modules.

[0051] The heat pump air conditioning module of this embodiment includes a compressor 10, a water-cooled condenser 11, a first expansion valve 12, an external condenser 13, a drying bottle 14, a second expansion valve 15 and a passenger compartment evaporator 16 which are connected in series in sequence, and the outlet end of the passenger compartment evaporator 16 is connected to the inlet end of the compressor 10.

[0052] The water-cooled condenser 11 of this embodiment has a coolant flow channel and a refrigerant flow channel, so that the two media of the coolant and the refrigerant inside it undergo heat exchange. The water-cooled condenser 11 specifically includes a first refrigerant inlet end, a first refrigerant outlet end, a first coolant inlet end and a first coolant outlet end. The first refrigerant outlet end of the water-cooled condenser 11 is also provided with a first bypass pipe connected to the first refrigerant outlet end of the external condenser 13, and a switch valve 17 is provided on the first bypass pipe. The first expansion valve 12 and the external condenser 13 are arranged in parallel with the first bypass valve, so that the refrigerant can flow directly from the water-cooled condenser 11 to the drying bottle 14. The first coolant outlet end of the water-cooled condenser 11 is connected to the warm air heating module, and the first liquid inlet end of the water-cooled condenser 11 is connected to the first valve port of the four-way valve 70.

[0053] The outlet end of the drying bottle 14 of this embodiment is also provided with a second bypass pipe connected to the inlet end of the compressor 10, and the second bypass pipe is provided with a third expansion valve 18 and a first heat exchanger 19. The first heat exchanger 19 of this embodiment has a coolant flow channel and a refrigerant flow channel, so that the two media of the coolant and the refrigerant inside it undergo heat exchange. The first heat exchanger 19 specifically includes a second refrigerant inlet end, a second refrigerant outlet end, a second coolant inlet end, and a second coolant outlet end. The second refrigerant inlet end is connected to the outlet end of the third expansion valve 18, and the second refrigerant outlet end is connected to the inlet end of the compressor 10. The second coolant inlet end in the first heat exchanger 19 is connected to the sixth valve port of the seven-way valve 60, and the second coolant outlet end is connected to the seventh valve port of the seven-way valve 60.

[0054] The warm air heating module of this embodiment includes a first water pump 21 and a warm air core 20 connected in series in sequence, the warm air core 20 is integrated with a PTC heater, the liquid inlet end of the first water pump 21 is connected to the second liquid outlet end of the water-cooled condenser 11, and the liquid outlet end of the warm air core 20 is connected to the fourth valve port of the four-way valve 70.

[0055] The battery pack heat dissipation module of this embodiment includes a battery cold plate 30, a second heat exchanger 31 and a second water pump 32 connected in series, wherein the liquid inlet end of the battery cold plate 30 is connected to the fourth valve port of the seven-way valve 60, and the liquid outlet end of the second water pump 32 is connected to the fifth valve port of the seven-way valve 60. The second heat exchanger 31 of this embodiment has two coolant flow channels for heat exchange of the coolant, and the second heat exchanger 31 specifically includes a third coolant inlet end, a third coolant outlet end, a fourth coolant inlet end and a fourth coolant outlet end. The liquid outlet end of the battery cold plate 30 is connected to the third coolant inlet end of the second heat exchanger 31, and the third coolant outlet end of the second heat exchanger 31 is connected to the liquid inlet end of the second water pump 32. The fourth liquid inlet end of the second heat exchanger 31 is connected to the liquid outlet end of the first water pump 21, and the fourth liquid outlet end of the second heat exchanger 31 is connected to the third valve port of the four-way valve 70.

[0056] The engine cooling module of this embodiment includes a third water pump 44, an engine cylinder block 40, an engine cylinder head 41, an electronic thermostat 42 and a first radiator 43 connected in series in sequence, and the liquid outlet of the first radiator 43 is connected to the liquid inlet of the third water pump 44. A third bypass pipe is provided between the engine cylinder head 41 and the electronic thermostat 42, connected to the liquid inlet of the first water pump 21, and an exhaust gas heat exchanger is provided on the third bypass pipe to recycle the waste heat of the engine exhaust gas. The second valve port of the four-way valve 70 is connected to the inlet of the third water pump 44. The engine module also includes a supercharger 45, the inlet of the supercharger 45 is connected to the engine cylinder block 40, and the outlet of the supercharger 45 is connected between the engine cylinder head 41 and the electronic thermostat 42.

[0057] The engine cooling module of this embodiment further includes an expansion pot 46 to replenish the coolant. The liquid replenishing port of the expansion pot 46 is connected to the liquid inlet end of the third water pump 44. The first radiator 43 is also provided with a first degassing pipeline connected to the expansion pot 46, and the engine cylinder head 41 is provided with a second degassing pipeline connected to the expansion pot 46. The expansion pot 46 can not only replenish the coolant, but also discharge the gas to prevent cavitation.

[0058] The electric drive heat dissipation module of this embodiment includes a fourth water pump 53, an electronic control component 50, an intercooler 51 and a motor component 52 which are connected in series in sequence, wherein the liquid inlet end of the fourth water pump 53 is connected to the first valve port of the seven-way valve 60, and the liquid outlet end of the motor component 52 is connected to the second valve port of the seven-way valve 60; wherein a fourth bypass pipe is arranged at the outlet end of the motor component 52 to be connected to the third valve port of the seven-way valve 60, and a second radiator 54 is arranged on the fourth bypass pipe.

[0059] See Fig.13In this embodiment, the external condenser 13, the first radiator 43 and the second radiator 54 are centrally arranged together and dissipate heat through the fan 80, wherein the first radiator 43 is arranged close to the fan 80, and the second radiator 54 and the external condenser 13 are arranged away from the fan 80 in turn, so as to dissipate heat reasonably. In conventional automobiles, the external condenser 13, the first radiator 43 and the second radiator 54 can be arranged at the front grille position of the front of the vehicle to ensure the heat dissipation effect.

[0060] The heat pump air conditioning module, warm air heating module, battery pack cooling module, engine cooling module and electric drive cooling module of this embodiment are connected through the four-way valve 70 and the seven-way valve 60, and include the following twelve working modes, five of which are applied to pure electric driving conditions, and seven of which are applied to hybrid driving conditions.

[0061] See Figure 1 Mode 1 is applied to pure electric driving conditions in low temperature environments. When the passenger compartment is heated and the battery pack is heated, the switch valve 17 in the heat pump air-conditioning module is opened, the first valve port, the third valve port and the fourth valve port of the four-way valve 70 are opened, the first valve port of the seven-way valve 60 is connected to the seventh valve port, the second valve port is connected to the sixth valve port, the fourth valve port is connected to the fifth valve port and the third valve port is closed.

[0062] In this mode, the heat generated by the electric drive cooling module in a low temperature environment can be transferred to the coolant through the oil cooler, so that the temperature of the coolant in the electric drive cooling module rises, and the fourth water pump 53 in the electric drive cooling module pumps the heated coolant to the first heat exchanger 19. The refrigerant of the heat pump air conditioning module first releases heat to the battery pack cooling module and the warm air heating module when passing through the water-cooled condenser 11, so as to realize the functions of passenger compartment heating and battery pack heating; the refrigerant in the water-cooled condenser 11 then flows through the second bypass pipe, and on the one hand, it can heat the cabin through the passenger compartment evaporator 16, and on the other hand, it can absorb heat from the coolant through the first heat exchanger 19, so as to make full use of the waste heat in the electric drive cooling module. It should be noted that the passenger compartment evaporator 16 in the heat pump air conditioning module and the warm air core 20 in the warm air heating module can be selectively opened according to demand, which is a conventional means, so it is not repeated in this embodiment.

[0063] See Figure 2 Mode 2 is applied to pure electric driving conditions in low temperature environments. When the battery pack is heated, the heat pump air-conditioning module is closed, the first valve port of the seven-way valve 60 is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed.

[0064] In this mode, the heat generated by the electric drive cooling module in a low-temperature environment can be transferred to the coolant through the oil cooler, causing the temperature of the coolant in the electric drive cooling module to rise. The coolant in the electric drive cooling module can enter the battery pack cooling module, and the waste heat of the electric drive cooling module can be used to heat the battery pack.

[0065] See Figure 3 Mode three is applied to pure electric driving conditions in low temperature environments. When the electric drive cooling module is insulated, the heat pump air-conditioning module is closed, the first valve port of the seven-way valve 60 is connected to the second valve port, the fifth valve port is connected to the sixth valve port, the fourth valve port is connected to the seventh valve port, and the third valve port is closed.

[0066] In this mode, the heat generated by the electric drive cooling module in a low-temperature environment can be transferred to the coolant through the oil cooler. At this time, the coolant only circulates in the electric drive cooling module, allowing the coolant to heat up quickly and provide reserve heat energy for mode one and mode two.

[0067] See Figure 4 Mode four is applied to pure electric driving conditions under normal temperature environment. When the battery pack selectively dissipates heat according to the temperature of the battery cell, the heat pump air-conditioning module is closed, and the first valve port of the seven-way valve 60 is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the fourth valve port is connected to the second valve port, or the fourth valve port is connected to the third valve port.

[0068] In this mode, the electric drive heat dissipation module and the battery heat dissipation module are arranged in series. When the temperature of the coolant in the electric drive heat dissipation module is low, the fourth valve port of the seven-way valve 60 is connected to the second valve port, and the coolant in the electric drive heat dissipation module can directly enter the battery heat dissipation module from the liquid outlet of the motor assembly 52; when the temperature of the coolant in the electric drive heat dissipation module is high, the fourth valve port is connected to the third valve port, and the coolant in the electric drive heat dissipation module enters the battery heat dissipation module after passing through the fourth bypass pipeline. The medium-temperature radiator on the fourth bypass pipeline can reduce the temperature of the coolant in the electric drive heat dissipation module, preferably controlling the temperature of the coolant at about 25°C. Mode 4 does not need to turn on the heat pump air conditioning module to cool the battery pack module, which can meet the heat dissipation requirements of the battery pack, thereby achieving the purpose of reducing the energy consumption of the entire vehicle.

[0069] See Figure 5 Mode five is applied to pure electric driving conditions in high temperature environments. When the passenger compartment is cooled and the battery pack is dissipating heat, the switch valve 17 of the heat pump air-conditioning module is closed, the first valve port of the seven-way valve 60 is connected to the third valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the second valve port is closed.

[0070] In the heat pump air conditioning module in this mode, after the refrigerant passes through the external condenser 13, it can firstly provide cooling to the cabin through the passenger compartment evaporator 16, and secondly, it can exchange heat with the coolant in the first heat exchanger 19. The coolant in the first heat exchanger 19 can flow through the battery pack heat dissipation module to dissipate heat for the battery pack. The coolant in the electric drive heat dissipation module is cooled by the second radiator 54 and then flows through the battery pack heat dissipation module to dissipate heat for the battery pack.

[0071] See Figure 6 Mode six is ​​applied to hybrid driving conditions in low temperature environments. When the battery pack is heated, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned on, the first valve port, the third valve port and the fourth valve port of the four-way valve 70 are opened, and the second valve port is closed. The first valve port of the seven-way valve 60 is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed.

[0072] In this mode, the coolant in the engine cooling module only circulates inside the module, so that the coolant in the engine cooling module can heat up quickly to reserve the waste heat of the engine cooling module. The PTC heater in the warm air heating module heats the coolant inside it. The coolant in the warm air heating module is used to heat the passenger compartment on the one hand, and releases heat to the battery pack cooling module through the second heat exchanger 31 on the other hand, thereby heating the battery pack. The heat generated by the electric drive cooling module in a low temperature environment can be transferred to the coolant through the oil cooler, so that the temperature of the coolant in the electric drive cooling module rises, and the coolant in the electric drive cooling module can enter the battery pack cooling module, using the waste heat of the electric drive cooling module to heat the battery pack.

[0073] See Figure 7 Mode seven is applied to hybrid driving conditions in low temperature environments. When the passenger compartment is heated and the battery pack is heated, the heat pump air-conditioning module is turned on, the PTC heater in the warm air heating module is turned off, the first valve port, the third valve port and the fourth valve port of the four-way valve 70 are opened, and the second valve port is closed. The first valve port of the seven-way valve 60 is connected to the seventh valve port, the second valve port is connected to the sixth valve port, the fourth valve port is connected to the fifth valve port, and the third valve port is closed.

[0074] In this mode, the coolant in the engine cooling module circulates only inside the module, so that the coolant in the engine cooling module can be quickly heated up to reserve the waste heat of the engine cooling module. The heat generated by the electric drive cooling module in a low-temperature environment can be transferred to the coolant through the oil cooler, so that the temperature of the coolant in the electric drive cooling module rises, and the electric drive pump in the electric drive cooling module circulates the heated coolant to the first heat exchanger 19. The refrigerant of the heat pump air conditioning module first releases heat to the battery pack cooling module and the warm air heating module when passing through the water-cooled condenser 11 to achieve the functions of passenger compartment heating and battery pack heating; the refrigerant in the water-cooled condenser 11 then flows through the second bypass pipe, which can firstly provide heat to the cabin through the passenger compartment evaporator 16, and secondly absorb heat from the coolant through the first heat exchanger 19 to save energy.

[0075] See Figure 8 Mode eight is applied to hybrid driving conditions in low temperature environments. When the passenger compartment is heated and the battery pack is heated, the heat pump air-conditioning module is turned off, the PTC heater in the heater module is turned off, the second valve port and the fourth valve port of the four-way valve 70 are opened, the first valve port and the third valve port are closed, the first valve port of the seven-way valve 60 is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed.

[0076] In this mode, the coolant in the engine cooling module can enter the heater module after passing through the exhaust gas heat exchanger, and use the waste heat of the engine to achieve the function of heating the passenger compartment. The heat generated by the electric drive cooling module in a low temperature environment can be transferred to the coolant through the oil cooler, so that the temperature of the coolant in the electric drive cooling module rises. The electric drive pump in the electric drive cooling module pumps the heated coolant to the battery pack cooling module to heat the battery pack.

[0077] See Fig. 9 Mode nine is applied to hybrid driving conditions in low temperature environments. When the battery pack is heated, the heat pump air-conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port and the third valve port of the four-way valve 70 are opened, the first valve port and the fourth valve port are closed, the first valve port of the seven-way valve 60 is connected to the second valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed.

[0078] In this mode, the coolant in the engine cooling module first passes through the exhaust gas heat exchanger, and then flows through the second heat exchanger 31 in the battery pack cooling module, using the waste heat of the engine to heat the coolant in the battery pack cooling, thereby heating the battery pack. The coolant in the electric drive cooling module only circulates inside the module, so that the coolant in the electric drive cooling module can quickly heat up to reserve heat.

[0079] See Fig.10Mode ten is applied to hybrid driving conditions in low temperature environments. When the passenger compartment is heated and the battery pack is heated, the heat pump air-conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port, the third valve port and the fourth valve port of the four-way valve 70 are opened, and the first valve port is closed; the first valve port of the seven-way valve 60 is connected to the second valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed.

[0080] In this mode, the coolant in the engine cooling module first passes through the exhaust gas heat exchanger, and then flows through the second heat exchanger 31 in the warm air cooling module and the battery pack cooling module, using the waste heat of the engine to heat the passenger compartment and the battery pack. The coolant in the electric drive cooling module only circulates inside the module, so that the coolant in the electric drive cooling module can quickly heat up to reserve heat.

[0081] See Fig.11 Mode 11 is applied to hybrid driving conditions under normal temperature. When the battery pack and the electric drive cooling module are dissipating heat, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port and the fourth valve port of the four-way valve 70 are opened, and the first valve port and the third valve port are closed. The first valve port of the seven-way valve 60 is connected to the seventh valve port, the second valve port or the third valve port is selectively connected to the fourth valve port, and the fifth valve port is connected to the sixth valve port.

[0082] In this mode, when the temperature of the coolant in the electric drive heat dissipation module is low, the second valve port of the seven-way valve 60 is connected to the fourth valve port, and the coolant in the electric drive heat dissipation module can directly flow into the battery pack heat dissipation module; when the temperature of the coolant in the electric drive heat dissipation module is high, the third valve port of the seven-way valve 60 is connected to the fourth valve port, and the coolant in the electric drive heat dissipation module needs to flow through the medium-temperature radiator before entering the battery pack heat dissipation module, which can ensure that the coolant in the electric drive heat dissipation module and the battery pack heat dissipation module is kept at a suitable temperature, which is preferably 25°C to 30°C. The coolant in the engine heat dissipation module flows through the warm air heating module and then flows back to the engine heat dissipation module to prevent the residual heat of the engine heat dissipation module from affecting the battery pack heat dissipation module.

[0083] See Fig.12 Mode twelve is applied to hybrid driving conditions in high temperature environments. When the passenger compartment is cooled and the battery pack is dissipated, the switch valve 17 of the heat pump air-conditioning module is closed, the PTC heater in the warm air heating module is turned off, the second valve port and the fourth valve port of the four-way valve 70 are opened, and the first valve port and the third valve port are closed. The first valve port of the seven-way valve 60 is connected to the third valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the second valve port is closed.

[0084] In the heat pump air conditioning module in this mode, after the refrigerant passes through the external condenser 13, it can firstly supply cooling to the cabin through the passenger compartment evaporator 16, and secondly, it can exchange heat with the coolant in the first heat exchanger 19. The coolant in the first heat exchanger 19 can flow through the battery pack heat dissipation module to dissipate heat for the battery pack. The coolant in the electric drive heat dissipation module is cooled by the second radiator 54 and then flows through the battery pack heat dissipation module to dissipate heat for the battery pack. The coolant in the engine heat dissipation module flows through the warm air heating module and then flows back to the engine heat dissipation module to prevent the waste heat of the engine heat dissipation module from affecting the battery pack heat dissipation module. The coolant in the electronic control heat dissipation module passes through the second radiator 54 during internal circulation to ensure that the electronic control heat dissipation module remains at a relatively low temperature.

[0085] The thermal management system of this embodiment can reasonably recover and utilize the waste heat of the engine and electric drive parts, and can effectively cope with low-temperature usage scenarios. The thermal management system can efficiently manage the heat of the engine, electric drive and battery pack to improve work efficiency.

[0086] It should be noted that the temperature of the normal temperature environment of this embodiment is 20-25°C. In Mode 2, Mode 6 and Mode 8, the temperature of the coolant in the electric drive heat dissipation module is 5°C higher than the lowest temperature of the battery cells in the battery pack heat dissipation module to ensure the heating effect of the waste heat of the electric drive heat dissipation module on the battery pack heat dissipation module. In Mode 6 and Mode 7, the temperature of the coolant in the engine heat dissipation module is less than 40°C, so the coolant in the engine heat dissipation module needs to circulate internally to heat up. In Mode 9, Mode 10 and Mode 11, the temperature of the coolant in the engine heat dissipation module is not less than 40°C to ensure that the engine heat dissipation module has sufficient heat reserves.

[0087] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A thermal management system, characterized in that: It comprises a heat pump air conditioning module, a warm air heating module, a battery pack cooling module, an engine cooling module, an electric drive cooling module, and a seven-way valve (60) and a four-way valve (70) connecting the aforementioned modules; The heat pump air conditioning module comprises a compressor (10) connected in series, a water-cooled condenser (11), a first expansion valve (12), an external condenser (13), a drying bottle (14), a second expansion valve (15) and a passenger compartment evaporator (16); the water-cooled condenser (11) specifically comprises a first refrigerant inlet end, a first refrigerant outlet end, a first coolant inlet end and a first coolant outlet end; the first refrigerant outlet end is provided with a first bypass pipe connected to the first refrigerant outlet end of the external condenser (13), and a switch valve (17) is provided on the first bypass pipe; the outlet end of the drying bottle (14) is provided with a second The bypass pipeline is connected to the inlet end of the compressor (10), and the second bypass pipeline is provided with a third expansion valve (18) and a first heat exchanger (19); the first heat exchanger (19) comprises a second refrigerant inlet end, a second refrigerant outlet end, a second coolant inlet end and a second coolant outlet end, the second refrigerant inlet end is connected to the outlet end of the third expansion valve (18), and the second refrigerant outlet end is connected to the inlet end of the compressor (10); the second coolant inlet end is connected to the sixth valve port of the seven-way valve (60), and the second coolant outlet end is connected to the seventh valve port of the seven-way valve (60); The warm air heating module comprises a first water pump (21) and a warm air core (20) connected in series, the warm air core (20) is integrated with a PTC heater, the liquid inlet end of the first water pump (21) is connected to the second liquid outlet end of the water-cooled condenser (11), and the liquid outlet end of the warm air core (20) is connected to the fourth valve port of the four-way valve (70); The battery pack heat dissipation module comprises a battery cold plate (30), a second heat exchanger (31) and a second water pump (32) connected in series, the liquid inlet end of the battery cold plate (30) is connected to the fourth valve port of the seven-way valve (60), and the liquid outlet end of the second water pump (32) is connected to the fifth valve port of the seven-way valve (60); The engine cooling module comprises a third water pump (44), an engine cylinder block (40), an engine cylinder head (41), an electronic thermostat (42) and a first radiator (43) connected in series, the liquid outlet of the first radiator (43) being connected to the liquid inlet of the third water pump (44), a third bypass pipe being arranged between the engine cylinder head (41) and the electronic thermostat (42) and connected to the liquid inlet of the first water pump (21), and an exhaust gas heat exchanger being arranged on the third bypass pipe; the second valve port of the four-way valve (70) being connected to the inlet of the third water pump (44), and a supercharger (45) being arranged between the engine cylinder block (40) and the electronic thermostat (42); The electric drive heat dissipation module comprises a fourth water pump (53), an electric control component (50), an intercooler (51) and a motor component (52) connected in series, wherein the liquid inlet end of the fourth water pump (53) is connected to the first valve port of the seven-way valve (60), and the liquid outlet end of the motor component (52) is connected to the second valve port of the seven-way valve (60); a fourth bypass pipe is arranged at the outlet end of the motor component (52) and is connected to the third valve port of the seven-way valve (60), and a second radiator (54) is arranged on the fourth bypass pipe.

2. The thermal management system according to claim 1, characterized in that: The thermal management system includes five operating modes in pure electric driving conditions: Mode 1 is applied to pure electric driving conditions in a low-temperature environment. When the passenger compartment is heated and the battery pack is heated, the switch valve (17) in the heat pump air conditioning module is opened, the first valve port, the third valve port and the fourth valve port of the four-way valve (70) are opened, the first valve port of the seven-way valve (60) is connected to the seventh valve port, the second valve port is connected to the sixth valve port, the fourth valve port is connected to the fifth valve port, and the third valve port is closed; Mode 2 is applied to pure electric driving conditions in a low-temperature environment. When the battery pack is heated, the heat pump air conditioning module is closed, the first valve port of the seven-way valve (60) is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed; Mode 3 is applied to pure electric driving conditions in a low-temperature environment. When the electric drive heat dissipation module is insulated, the heat pump air conditioning module is closed, the first valve port of the seven-way valve (60) is connected to the second valve port, the fifth valve port is connected to the sixth valve port, the fourth valve port is connected to the seventh valve port, and the third valve port is closed; Mode 4 is applied to pure electric driving conditions under normal temperature environment. When the battery pack selectively dissipates heat according to the temperature of the battery core, the heat pump air conditioning module is closed, and the first valve port of the seven-way valve (60) is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, the fourth valve port is connected to the second valve port, or the fourth valve port is connected to the third valve port; Mode five is applied to pure electric driving conditions in high temperature environments. When the passenger compartment is cooled and the battery pack is cooled, the switch valve (17) of the heat pump air conditioning module is closed, the first valve port of the seven-way valve (60) is connected to the third valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the second valve port is closed.

3. The thermal management system according to claim 2, characterized in that: The thermal management system also includes seven operating modes in pure hybrid driving conditions: Mode 6 is applied to hybrid driving conditions in a low-temperature environment. When the battery pack is heated, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned on, the first valve port, the third valve port and the fourth valve port of the four-way valve (70) are opened, and the second valve port is closed. The first valve port of the seven-way valve (60) is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed. Mode 7 is applied to hybrid driving conditions in a low-temperature environment. When the passenger compartment is heated and the battery pack is heated, the switch valve (17) of the heat pump air conditioning module is opened, the PTC heater in the warm air heating module is closed, the first valve port, the third valve port and the fourth valve port of the four-way valve (70) are opened, and the second valve port is closed. The first valve port of the seven-way valve (60) is connected to the seventh valve port, the second valve port is connected to the sixth valve port, the fourth valve port is connected to the fifth valve port, and the third valve port is closed. Mode 8 is applied to hybrid driving conditions in a low-temperature environment. When the passenger compartment is heated and the battery pack is heated, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port and the fourth valve port of the four-way valve (70) are opened, the first valve port and the third valve port are closed, the first valve port of the seven-way valve (60) is connected to the seventh valve port, the second valve port is connected to the fourth valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed; Mode nine is applied to hybrid driving conditions in a low-temperature environment. When the battery pack is heated, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port and the third valve port of the four-way valve (70) are opened, the first valve port and the fourth valve port are closed, the first valve port of the seven-way valve (60) is connected to the second valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed; Mode 10 is applied to hybrid driving conditions in a low-temperature environment. When the passenger compartment is heated and the battery pack is heated, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port, the third valve port and the fourth valve port of the four-way valve (70) are opened, and the first valve port is closed; the first valve port of the seven-way valve (60) is connected to the second valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the third valve port is closed; Mode 11 is applied to hybrid driving conditions under normal temperature environment. When the battery pack and the electric drive cooling module are cooling, the heat pump air conditioning module is turned off, the PTC heater in the warm air heating module is turned off, the second valve port and the fourth valve port of the four-way valve (70) are opened, and the first valve port and the third valve port are closed. The first valve port of the seven-way valve (60) is connected to the seventh valve port, the second valve port or the third valve port is selectively connected to the fourth valve port, and the fifth valve port is connected to the sixth valve port. Mode twelve is applied to hybrid driving conditions in a high temperature environment. When the passenger compartment is cooled and the battery pack is cooled, the switch valve (17) of the heat pump air conditioning module is closed, the PTC heater in the warm air heating module is closed, the second valve port and the fourth valve port of the four-way valve (70) are opened, and the first valve port and the third valve port are closed. The first valve port of the seven-way valve (60) is connected to the third valve port, the fourth valve port is connected to the seventh valve port, the fifth valve port is connected to the sixth valve port, and the second valve port is closed.

4. The thermal management system according to claim 3, characterized in that: The temperature of the normal temperature environment is 20-25°C.

5. The thermal management system according to claim 3, characterized in that: In the second mode, the sixth mode and the eighth mode, the temperature of the coolant in the electric drive heat dissipation module is 5° C. higher than the lowest temperature of the battery cells in the battery pack heat dissipation module.

6. The thermal management system according to claim 3, characterized in that: In the sixth mode and the seventh mode, the temperature of the coolant in the engine cooling module is less than 40°C.

7. The thermal management system according to claim 3, characterized in that: In the ninth mode, the tenth mode and the eleventh mode, the temperature of the coolant in the engine cooling module is not less than 40°C.

8. The thermal management system according to any one of claims 1 to 7, characterized in that: The external condenser (13), the first radiator (43) and the second radiator (54) are centrally arranged and heat is dissipated by a fan (80); the first radiator (43) is arranged close to the fan (80), and the second radiator (54) and the external condenser (13) are respectively away from the fan (80).

9. The thermal management system according to any one of claims 1 to 7, characterized in that: The engine cooling module further comprises an expansion pot (46), a liquid replenishing port of the expansion pot (46) being connected to a liquid inlet end of the third water pump (44), a first degassing pipeline being arranged on the first radiator (43) and connected to the expansion pot (46), and a second degassing pipeline being arranged on the engine cylinder head (41) and connected to the expansion pot (46).

10. A hybrid vehicle, characterized in that: The hybrid vehicle is equipped with a thermal management system according to any one of claims 1 to 9.

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