Heat pump heat management system of heavy truck and heavy truck

Abstract

The invention discloses a heat pump heat management system of a heavy truck and the heavy truck, the heat pump heat management system comprises a battery circulation loop, a first refrigerant circulation loop, a second refrigerant circulation loop and a heating circulation loop, and the first refrigerant circulation loop and the second refrigerant circulation loop are arranged; whether the second refrigerant circulation loop participates in cooling of the battery pack or not can be determined by controlling the states of the three-way valve, the first five-way valve, the second five-way valve, the compressors and the water pumps, and the first refrigerant circulation system or the second refrigerant circulation system can be selectively adopted to conduct conventional air-conditioning cooling on the battery pack. In addition, the first refrigerant circulating system and the second refrigerant circulating system can be adopted to operate at the same time to cool the battery pack with higher strength, so that the cooling strength of the battery pack is increased to meet the maximum cooling requirement, and the phenomenon that the endurance is reduced due to the fact that the cooling requirement cannot be met due to the too large capacity of the battery pack of the heavy truck is avoided.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and more particularly to a heat pump thermal management system for a heavy truck and a heavy truck. Background Art

[0002] With the increase in the number of motor heavy trucks, the environmental pollution caused by motor vehicle emissions is becoming more and more serious. Among them, the emission ratio of heavy trucks is relatively high, which has become a more difficult problem to be solved. Among them, zero-emission pure electric heavy trucks can effectively solve this problem.

[0003] Compared with pure electric passenger cars, pure electric heavy-duty trucks have higher drive motor power and larger battery pack capacity, so they require greater electric drive and battery pack heat dissipation capabilities. The battery pack also requires greater heating capacity at low temperatures, which poses a greater challenge to the heat pump thermal management system capabilities and has a greater impact on the cruising range of heavy-duty trucks.

[0004] In the related technology, the heat pump thermal management system of pure electric heavy trucks usually adopts a liquid cooling system. Through the water pipes, water pumps and heat dissipation connections, the coolant is driven by the water pump to circulate in the water pipes to cool the battery pack, and heat exchange is performed through the radiator. The radiator is cooled by a fan to reduce the temperature of the coolant. This cooling system has a relatively simple structure, but the heat dissipation effect is relatively low. For the increasingly high drive motor power and the battery pack capacity with higher cruising range, if this liquid cooling system is still used, it cannot meet the heat dissipation requirements and cannot effectively cool the battery pack. At the same time, there is another type of heat pump thermal management system for pure electric heavy trucks that uses an air conditioning system to cool the battery pack. The disadvantage of this system is that it cannot meet the increasingly high heat dissipation requirements of the battery pack and is only suitable for passenger cars and pure electric heavy trucks with a shorter cruising range. Summary of the invention

[0005] Embodiments of the present invention provide a heat pump thermal management system for a heavy truck and a heavy truck.

[0006] The heat pump thermal management system for a heavy truck according to an embodiment of the present invention comprises:

[0007] A battery circulation loop, comprising a battery water pump, a battery pack, a three-way valve, a water-to-water heat exchanger and a first five-way valve connected in sequence, wherein a first valve port and a second valve port of the three-way valve are connected between the battery pack and the water-to-water heat exchanger;

[0008] A first refrigerant circulation loop includes a first compressor, a first outdoor heat exchanger and a first battery cooler connected in sequence, the third valve port of the three-way valve is connected to the coolant inlet of the first battery cooler, and the coolant outlet of the first battery cooler is connected to the pipeline between the water-to-water heat exchanger and the first five-way valve;

[0009] A second refrigerant circulation circuit comprises a second compressor, a condenser, and a second outdoor heat exchanger connected in sequence, a first stop valve is provided between the second outdoor heat exchanger and the second compressor, the second refrigerant circulation circuit also comprises a second battery cooler and an evaporator, the refrigerant inlet of the second battery cooler is connected between the second outdoor heat exchanger and the first stop valve, and a one-way valve is provided at the refrigerant inlet of the second battery cooler; the refrigerant outlet of the second battery cooler is connected to the second compressor, the coolant inlet of the second battery cooler is connected to the first coolant inlet and the first coolant outlet of the water-to-water heat exchanger, the first coolant inlet of the water-to-water heat exchanger is connected to the second valve port of the three-way valve, and the first coolant outlet of the water-to-water heat exchanger is connected to the first five-way valve; the inlet of the evaporator is connected to the pipeline between the condenser and the second outdoor heat exchanger, a second stop valve is provided on the pipeline connecting the inlet of the evaporator, the pipeline between the second stop valve and the evaporator is connected to the pipeline between the one-way valve and the second battery cooler, and the outlet of the evaporator is connected to the second compressor; and

[0010] A heating circulation loop includes a heating water pump, a heater core and a second five-way valve connected in sequence, the coolant pipeline of the condenser is connected between the heating water pump and the heater core, the outlet of the heater core is connected to the second five-way valve, the second coolant inlet of the water-to-water heat exchanger is connected between the condenser and the inlet of the heater core, and the second coolant outlet of the water-to-water heat exchanger is connected to the second five-way valve.

[0011] In some embodiments, the heat pump thermal management system further comprises an electric drive circulation loop, wherein the electric drive circulation loop comprises an electric drive water pump, an electric drive component and a radiator connected in sequence;

[0012] The first valve port of the first five-way valve is connected to the fourth valve port of the second five-way valve, the second valve port of the first five-way valve is connected to the inlet of the electric drive water pump, the third valve port of the first five-way valve is connected to the first coolant outlet of the water-to-water heat exchanger, the fourth valve port of the first five-way valve is connected to the battery water pump, and the fifth valve port of the first five-way valve is connected to the outlet of the radiator;

[0013] The first valve port of the second five-way valve is connected to the outlet of the heater core, the second valve port of the second five-way valve is connected to the heating water pump, the third valve port of the second five-way valve is connected to the pipeline between the electric drive component and the radiator, the fourth valve port of the second five-way valve is connected to the first valve port of the first five-way valve, and the fifth valve port of the second five-way valve is connected to the second coolant outlet of the water-to-water heat exchanger.

[0014] In certain embodiments, a first temperature sensor and a first liquid heater are provided between the battery pack and the battery water pump.

[0015] In certain embodiments, a second temperature sensor is provided between the battery pack and the first valve port of the three-way valve.

[0016] In certain embodiments, a first low-pressure pressure sensor is provided at the refrigerant outlet of the first battery cooler, a first throttling device is provided at the refrigerant inlet of the first battery cooler, and a first high-pressure pressure sensor is provided at the outlet of the first compressor.

[0017] In certain embodiments, an exhaust temperature sensor is provided at the outlet of the second compressor, a second low-pressure pressure sensor is provided at the inlet of the second compressor, a second high-pressure pressure sensor is provided at the refrigerant outlet of the condenser, a second throttling device is provided at the inlet of the second outdoor heat exchanger, a third throttling device is provided at the refrigerant inlet of the second battery cooler, and a fourth throttling device is provided at the inlet of the evaporator.

[0018] In certain embodiments, the heat pump thermal management system has a first battery cooling mode;

[0019] In the first battery cooling mode, the first compressor is turned off, the second compressor is turned on, the heating water pump is turned off, the battery water pump is turned on, and the first valve port of the three-way valve is connected to the second valve port;

[0020] The refrigerant in the second refrigerant circulation circuit flows through the condenser, the second outdoor heat exchanger and the second battery cooler 35 in sequence under the action of the second compressor, and then flows back to the second compressor; the coolant flows through the battery pack, the three-way valve, the second battery cooler, the water-to-water heat exchanger and the first five-way valve in sequence under the action of the battery water pump, and then flows back to the battery water pump;

[0021] The refrigerant releases heat and cools in the second outdoor heat exchanger. When the cooled refrigerant flows through the second battery cooler, it absorbs heat in the coolant and evaporates to cool the coolant, thereby cooling the battery pack.

[0022] In certain embodiments, the heat pump thermal management system has a second battery cooling mode;

[0023] In the second battery cooling mode, the first compressor is started, the battery water pump is started, the heating water pump is turned off, the battery water pump is started, and the first valve port of the three-way valve is connected to the third valve port;

[0024] The refrigerant in the first refrigerant circulation circuit flows through the first outdoor heat exchanger and the first battery cooler in sequence under the action of the first compressor, and then flows back to the first compressor; the coolant flows through the battery pack, the three-way valve, the first battery cooler and the first five-way valve in sequence under the action of the battery water pump, and then flows back to the battery water pump;

[0025] The refrigerant releases heat and cools in the first outdoor heat exchanger. The cooled refrigerant absorbs heat from the coolant and evaporates when flowing through the first battery cooler to cool the coolant, thereby cooling the battery pack.

[0026] In certain embodiments, the heat pump thermal management system has a third battery cooling mode;

[0027] In the third battery cooling mode, the first compressor and the second compressor are both started, the battery water pump is started, and the first valve port of the three-way valve is connected to the second valve port and the third valve port;

[0028] The refrigerant in the second refrigerant circulation circuit flows through the condenser, the second outdoor heat exchanger and the second battery cooler in sequence under the action of the second compressor and then flows back into the second compressor;

[0029] Under the action of the first compressor, the refrigerant in the first refrigerant circulation circuit flows through the first outdoor heat exchanger and the first battery cooler in sequence and then flows back into the first compressor;

[0030] The coolant flows through the battery pack and the three-way valve in sequence under the action of the battery water pump. The coolant is split at the three-way valve. One path flows out from the second valve port of the three-way valve and flows through the first battery cooler and the first five-way valve before flowing back to the battery water pump. The other path flows out from the third valve port of the three-way valve and flows through the first battery cooler and the first five-way valve before flowing back to the battery water pump.

[0031] The refrigerant in the second refrigerant circulation loop releases heat and cools in the second outdoor heat exchanger, and the cooled refrigerant absorbs heat from the coolant and evaporates when flowing through the second battery cooler, thereby cooling the coolant. The refrigerant in the first refrigerant circulation loop releases heat and cools in the first outdoor heat exchanger, and the cooled refrigerant absorbs heat from the coolant and evaporates when flowing through the first battery cooler, thereby cooling the coolant, thereby jointly cooling the battery pack.

[0032] A heavy truck according to an embodiment of the present invention comprises a vehicle body and a heat pump thermal management system according to any one of the above embodiments, wherein the heat pump thermal management system is mounted on the vehicle body.

[0033] In the heat pump thermal management system and heavy truck implemented by the present invention, by setting the first refrigerant circulation loop and the second refrigerant circulation loop, by controlling the states of the three-way valve, the first five-way valve, the second five-way valve, and each compressor and water pump, it can be determined whether the second refrigerant circulation loop participates in the cooling of the battery pack. It can selectively use the first refrigerant circulation system or the second refrigerant circulation system to perform conventional air-conditioning cooling on the battery pack, or it can use the first refrigerant circulation system and the second refrigerant circulation system to run simultaneously to perform a higher intensity cooling on the battery pack, thereby increasing the cooling intensity of the battery pack to meet the maximum cooling demand of the battery pack and avoid the phenomenon that the battery pack capacity of the heavy truck vehicle is too large and the cooling demand cannot be met, resulting in a decrease in cruising range. In other words, through the setting of the three-way valve and the first refrigerant circulation loop, the heat pump thermal management system can meet the heat dissipation demand of the battery pack of the heavy truck vehicle and improve the cruising range.

[0034] Additional aspects and advantages of embodiments of the present invention will be given in part in the following description and in part will be obvious from the following description or learned through practice of embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0036] Figure 1 It is a schematic structural diagram of a heavy-duty truck according to an embodiment of the present invention.

[0037] Figure 2 is a schematic diagram of the principle of a heat pump thermal management system according to an embodiment of the present invention;

[0038] Figure 3 is a flow path principle diagram of a heat pump thermal management system in a passenger compartment cooling mode according to an embodiment of the present invention;

[0039] Figure 4 It is a flow path principle diagram of a heat pump thermal management system in an air source heat pump heating mode according to an embodiment of the present invention;

[0040] Figure 5 It is a flow path principle diagram of a heat pump thermal management system in a water source heat pump heating mode according to an embodiment of the present invention;

[0041] Figure 6 It is a flow path principle diagram of a heat pump thermal management system in a dual-source heat pump heating mode according to an embodiment of the present invention;

[0042] Figure 7is a flow path schematic diagram of a heat pump thermal management system in a passenger compartment liquid heater heating mode according to an embodiment of the present invention;

[0043] Figure 8 is a flow path schematic diagram of a heat pump thermal management system in a passenger compartment electric drive waste heat heating mode according to an embodiment of the present invention;

[0044] Fig. 9 is a flow path principle diagram of a heat pump thermal management system in a passenger compartment heating and dehumidification mode according to an embodiment of the present invention;

[0045] Fig.10 is a flow path principle diagram of a heat pump thermal management system in a first battery cooling mode according to an embodiment of the present invention;

[0046] Fig.11 is a flow path principle diagram of a heat pump thermal management system in a second battery cooling mode according to an embodiment of the present invention;

[0047] Fig.12 is a flow path principle diagram of a heat pump thermal management system in a third battery cooling mode according to an embodiment of the present invention;

[0048] Fig.13 It is a schematic diagram of the flow path of the heat pump thermal management system in the battery natural heat dissipation mode according to an embodiment of the present invention;

[0049] Fig.14 is a flow path principle diagram of a heat pump thermal management system in a battery liquid heater heating mode according to an embodiment of the present invention;

[0050] Fig.15 is a schematic diagram of the flow path of a heat pump thermal management system in an electric drive waste heat heating battery mode according to an embodiment of the present invention;

[0051] Fig.16 It is a schematic diagram of the flow path of the heat pump thermal management system in the natural cooling mode of the electric drive circuit according to an embodiment of the present invention.

[0052] Description of main component symbols:

[0053] Heat pump thermal management system 100;

[0054] Battery circulation loop 10, battery water pump 11, battery pack 12, three-way valve 13, water-to-water heat exchanger 14, first five-way valve 15, first temperature sensor 16, first liquid heater 17, second temperature sensor 18;

[0055] First refrigerant circulation circuit 20, first compressor 21, first outdoor heat exchanger 22, first battery cooler 23, first low-pressure pressure sensor 24, first throttling device 25, first high-pressure pressure sensor 26

[0056] A second refrigerant circulation circuit 30, a second compressor 31, a condenser 32, a second outdoor heat exchanger 33, a first stop valve 34, a second battery cooler 35, an evaporator 36, a one-way valve 37, a second stop valve 38, an exhaust temperature sensor 39, a second low-pressure pressure sensor 310, a second high-pressure pressure sensor 311, a second throttling device 312, a third throttling device 313, a fourth throttling device 314, a first outlet temperature sensor 315, a second outlet temperature sensor 316, an evaporator surface temperature sensor 317, and a third outlet temperature sensor 318;

[0057] Heating circulation loop 40, heating water pump 41, warm air core 42, second five-way valve 43, second liquid heater 44;

[0058] Electric drive circulation loop 50, electric drive water pump 51, electric drive component 52, radiator 53;

[0059] A first electronic fan 60, a second electronic fan 70, and a kettle 80;

[0060] A heavy truck 1000 and a vehicle body 200 . DETAILED DESCRIPTION

[0061] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0062] In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0064] The disclosure below provides many different embodiments or examples for realizing different structures of embodiments of the present invention. In order to simplify the disclosure of embodiments of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, embodiments of the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but those of ordinary skill in the art may appreciate the application of other processes and / or the use of other materials.

[0065] See also Figure 1 The heavy truck 1000 of the embodiment of the present invention may include a vehicle body 200 and a heat pump thermal management system 100 of the embodiment of the present invention, and the heat pump thermal management system 100 is installed on the vehicle body 200. Specifically, the heavy truck 1000 may be a hybrid heavy truck or an electric heavy truck, that is, a new energy heavy truck, and the vehicle body 200 may include components such as a vehicle body and a frame, that is, in the invention, the components of the heavy truck 1000 other than the heat pump thermal management system 100 may be collectively referred to as the vehicle body 200, without specific limitation.

[0066] See also Figure 2 The heat pump thermal management system 100 in the embodiment of the present invention may include a battery circulation loop 10 , a first refrigerant circulation loop 20 , a second refrigerant circulation loop 30 and a heating circulation loop 40 .

[0067] like Figure 2 As shown, the battery circulation loop 10 may include a battery water pump 11, a battery pack 12, a three-way valve 13, a water-to-water heat exchanger 14 and a first five-way valve 15 connected in sequence, and the first valve port a and the second valve port b of the three-way valve 13 are connected between the battery pack 12 and the water-to-water heat exchanger 14. Specifically, in an embodiment of the present invention, the water-to-water heat exchanger 14 may have two heat exchange pipelines, and the two ends of one pipeline are respectively the first coolant inlet and the first coolant outlet, and the two ends of the other pipeline are respectively the second coolant inlet and the second coolant outlet, as shown in FIG. Figure 2 As shown, the first valve port a of the three-way valve 13 can be connected to the battery pack 12, the second valve port b of the three-way valve 13 can be connected to the first coolant inlet of the water-to-water heat exchanger 14, and the first coolant outlet of the water-to-water heat exchanger 14 can be connected to the third valve port g of the first five-way valve 15;

[0068] The first refrigerant circulation loop 20 may include a first compressor 21, a first outdoor heat exchanger 22 and a first battery cooler 23 connected in sequence, the third valve port c of the three-way valve 13 is connected to the coolant inlet of the first battery cooler 23, and the coolant outlet of the first battery cooler 23 is connected to the pipeline between the water-to-water heat exchanger 14 and the first five-way valve 15 (specifically, the first coolant outlet of the water-to-water heat exchanger 14 and the third valve port f of the first five-way valve 15).

[0069] The second refrigerant circulation loop 30 may include a second compressor 31, a condenser 32, and a second outdoor heat exchanger 33 which are connected in sequence. A first stop valve 34 is provided between the second outdoor heat exchanger 33 and the second compressor 31. The second refrigerant circulation loop 30 also includes a second battery cooler 35 and an evaporator 36. The refrigerant inlet of the second battery cooler 35 is connected between the second outdoor heat exchanger 33 and the first stop valve 34. A check valve 37 is provided at the refrigerant inlet of the second battery cooler 35.

[0070] The coolant inlet of the second battery cooler 35 is connected to the first coolant inlet and the first coolant outlet of the water-to-water heat exchanger 14. The first coolant inlet of the water-to-water heat exchanger 14 is connected to the second valve port b of the three-way valve 13. The first coolant outlet of the water-to-water heat exchanger 14 is connected to the first five-way valve 15 (specifically, it is connected to the third valve port f of the first five-way valve 15). That is to say, the second battery cooler 35 and the water-to-water heat exchanger 14 are integrated, the coolant inlet of the first battery cooler 23 matches the first coolant outlet of the water-to-water heat exchanger 14, and the second battery cooler 35 and the water-to-water heat exchanger 14 reuse a coolant flow pipeline, that is, the second battery cooler 35 and the water-to-water heat exchanger 14 are integrated into one piece, and the coolant flow pipeline of the second battery cooler 35 reuses one of the coolant flow pipelines of the water-to-water heat exchanger 14. In this way, the arrangement of the second battery cooler 35 and the water-to-water heat exchanger 14 can improve the degree of integration without the need for connection through external connecting pipelines, saving costs, shortening the wiring length of the coolant, and avoiding pressure and heat loss. Of course, it is understandable that in some embodiments, the second battery cooler 35 can also be independently arranged with the water-to-water heat exchanger 14, which is not specifically limited here.

[0071] The refrigerant outlet of the second battery cooler 35 is connected to the second compressor 31, and the inlet of the evaporator 36 is connected to the pipeline between the condenser 32 and the second outdoor heat exchanger 33. A second stop valve 38 is provided on the pipeline connected to the inlet of the evaporator 33. The pipeline between the second stop valve 38 and the evaporator 36 is connected to the pipeline between the one-way valve 37 and the second battery cooler 35, and the outlet of the evaporator 36 is connected to the second compressor.

[0072] The heating circulation loop 40 may include a heating water pump 41, a heater core 42 and a second five-way valve 43 connected in sequence, the coolant pipeline of the condenser 32 is connected between the heating water pump 41 and the heater core 42, the outlet of the heater core 42 is connected to the second five-way valve 43, the second coolant inlet of the water-to-water heat exchanger 14 is connected between the condenser 32 and the inlet of the heater core 42, and the second coolant outlet of the water-to-water heat exchanger 14 is connected to the second five-way valve 43.

[0073] Specifically, Figure 2 As shown, the heating water pump 41 can be connected to the second valve port j of the second five-way valve 43, the outlet of the heater core 42 can be connected to the first valve port i of the second five-way valve 43, and the second coolant outlet of the water-to-water heat exchanger 14 can be connected to the fifth valve port n of the second five-way valve 43.

[0074] In the heat pump thermal management system 100 and the heavy truck 1000 of the embodiment of the present invention, by setting the first refrigerant circulation loop 20 and the second refrigerant circulation loop 30, by controlling the three-way valve 13, the first five-way valve 15, the second five-way valve 43 and the states of each compressor and water pump, it can be determined whether the second refrigerant circulation loop 30 participates in the cooling of the battery pack 12, and it can selectively use the second refrigerant circulation system 30 to perform conventional air conditioning cooling on the battery pack 12, or it can use the first refrigerant circulation system 20 and the second refrigerant circulation system 30 to run at the same time to cool the battery pack 12 with greater intensity, thereby increasing the cooling intensity of the battery pack 12, thereby meeting the maximum cooling demand of the battery pack, and avoiding the phenomenon that the battery pack 12 capacity of the heavy truck vehicle cannot meet the cooling demand and the endurance is reduced. That is to say, by setting the three-way valve 13 and the first refrigerant circulation loop 20, the heat pump thermal management system 100 can meet the heat dissipation demand of the battery pack 12 of the heavy truck vehicle and improve the endurance.

[0075] At the same time, in an embodiment of the present invention, multiple modes can be realized by controlling the connection method of each valve port of the first five-way valve 15, the second five-way valve 43 and the three-way valve 13. For example, the air conditioning cooling, battery heating and other functions of the heavy truck 1000 can be realized, which will be specifically explained below.

[0076] Please continue reading Figure 2 In some embodiments, the heat pump thermal management system 100 further includes an electrically driven circulation loop 50, the electrically driven circulation loop 50 includes an electrically driven water pump 51, an electrically driven component 52 and a radiator 53 connected in sequence, and the radiator 53 may preferably be a low-temperature radiator.

[0077] like Figure 2As shown, in such an embodiment, the first valve port d of the first five-way valve 15 is connected to the fourth valve port m of the second five-way valve 43, the second valve port of the first five-way valve 15 is connected to the inlet of the electric drive water pump 51, the third valve port f of the first five-way valve 15 is connected to the first coolant outlet of the water-to-water heat exchanger 14, the fourth valve port g of the first five-way valve 15 is connected to the battery water pump 11, and the fifth valve port h of the first five-way valve 15 is connected to the outlet of the radiator 53;

[0078] The first valve port i of the second five-way valve 43 is connected to the outlet of the heater core 42, the second valve port j of the second five-way valve 43 is connected to the heating water pump 41, the third valve port k of the second five-way valve 43 is connected to the pipeline between the electric drive component 52 and the radiator 53, the fourth valve port m of the second five-way valve 43 is connected to the first valve port d of the first five-way valve 15, and the fifth valve port n of the second five-way valve 43 is connected to the second coolant outlet of the water-to-water heat exchanger 14.

[0079] In this way, the connectivity states of the valve ports of the first five-way valve 15 and the second five-way valve 43 can be controlled to enable the series and parallel connection between the battery circulation loop 10 and the electric drive circulation loop 50. For example, when the heat dissipation demand is not large and the heat dissipation can be performed at room temperature, the states of the two five-way valves can be controlled to allow the liquid in the battery circulation loop 10 to flow through the electric drive circulation loop 50 and dissipate the heat directly through the radiator 53. For another example, when the temperature is relatively low, the waste heat generated by the electric drive component 52 can be directly used to heat the battery pack 12, thereby achieving the purpose of utilizing waste heat to save energy.

[0080] Specifically, in an embodiment of the present invention, the first compressor 21 and the second compressor 31 are used to compress and transport the refrigerant, the first outdoor heat exchanger 22 and the second outdoor heat exchanger 33 are used to pass the refrigerant to exchange heat with the air outside the heavy truck 1000, the evaporator 36 is used to pass the refrigerant to cool the passenger compartment of the heavy truck 1000, the heater core 42 is used to air-condition and heat the passenger compartment of the heavy truck 1000, and the first battery cooler 23 and the second battery cooler 35 can be used to cool and heat the battery pack 12.

[0081] like Figure 2 As shown, in an embodiment of the present invention, a gas-liquid separator is further provided at the inlet of the second compressor 31, and the gas-liquid separator is used to separate the refrigerant into gas and liquid to avoid liquid hammer on the second compressor.

[0082] The radiator 53 is used to pass coolant to cool the coolant. In an embodiment of the present invention, the electric drive component 52 may include components such as a drive motor, a charging distribution module, and a vehicle controller of the heavy truck 1000. The various components inside the electric drive component 52 are connected through a coolant pipe, and the coolant in the coolant pipe can be used to heat or cool the electric drive component 52.

[0083] Also, see Figure 2 In an embodiment of the present invention, the first outdoor heat exchanger 22, the second outdoor heat exchanger 33 and the radiator 53 can together form a heat dissipation module, and the heat pump thermal management system 100 can also include a first electronic fan 60. The first electronic fan 60 can be set corresponding to the first outdoor heat exchanger 22, the second outdoor heat exchanger 33 and the radiator 53. The first electronic fan 60 is used to form an airflow flowing through the three so that the three can fully exchange heat.

[0084] In an embodiment of the present invention, the heater core 42 and the evaporator 36 can together form an air conditioning module of the heavy truck 1000, the heater core 42 can be used to heat the passenger compartment, and the evaporator 36 can be used to cool the passenger compartment. Figure 2 As shown, the heater core 42 and the evaporator may also correspond to a second electronic fan 70 to realize hot air and cold air. The two may share a fan or use two separate fans, which is not limited here.

[0085] See also Figure 2 In an embodiment of the present invention, a first temperature sensor 16 and a first liquid heater 17 may be provided between the battery pack 12 and the battery water pump 11 .

[0086] In this way, on the one hand, the first temperature sensor 16 can monitor the temperature of the coolant to determine whether there is a heating requirement for the battery pack 12; on the other hand, when there is a heating requirement for the battery pack 12 or the second refrigerant circulation circuit cannot meet the heating requirement of the battery pack 12, the coolant flowing through the battery pack 12 can be heated by the first liquid heater 17.

[0087] In some embodiments, a second temperature sensor 18 may be further provided between the battery pack 12 and the first valve port a of the three-way valve 13 .

[0088] In this way, the second temperature sensor 18 can monitor the temperature of the coolant flowing out of the battery pack 12 to accurately reflect the temperature of the battery pack 12 .

[0089] Furthermore, in some embodiments, a first low-pressure pressure sensor 24 is provided at the refrigerant outlet of the first battery cooler 23, a first throttling device 25 is provided at the refrigerant inlet of the first battery cooler 23, and a first high-pressure pressure sensor 26 is provided at the outlet of the first compressor 21. In this way, the first low-pressure pressure sensor 24 can monitor the low-temperature pressure of the refrigerant, the first throttling device 24 can throttle the refrigerant flowing into the first battery cooler 23, and the first high-pressure pressure sensor 26 can monitor the pressure of the refrigerant at the outlet of the first compressor 21.

[0090] Specifically, the first throttling device may be an electronic expansion valve or other device, which is not specifically limited here.

[0091] In some embodiments, an exhaust temperature sensor 39 is provided at the outlet of the second compressor 31, a second low-pressure pressure sensor 310 is provided at the inlet of the second compressor 31, a second high-pressure pressure sensor 311 is provided at the refrigerant outlet of the condenser 32, a second throttling device 312 is provided at the inlet of the second outdoor heat exchanger, a third throttling device 313 is provided at the refrigerant inlet of the second battery cooler 35, and a fourth throttling device 314 is provided at the inlet of the evaporator.

[0092] In this way, the exhaust temperature sensor 39 can monitor the temperature of the refrigerant at the outlet of the second compressor 31, the second low-pressure pressure sensor 31 can monitor the pressure of the refrigerant returning to the second compressor 31, the second high-pressure pressure sensor 311 can monitor the pressure of the refrigerant flowing out of the condenser 32, and the second throttling device 312, the third throttling device 313 and the fourth throttling device 314 can throttle the refrigerant entering the second outdoor heat exchanger 33, the second battery cooler 35 and the evaporator 36 respectively.

[0093] In some embodiments, a surface temperature sensor 317 is provided on the surface of the evaporator 36 to detect the surface temperature of the evaporator 36. A third temperature sensor is provided at the inlet of the electric drive component 52 to detect the temperature of the coolant flowing into the electric drive component 52.

[0094] In addition, in some embodiments, a first outlet temperature sensor 315 is provided between the second outdoor heat exchanger 33 and the second battery cooler 35, which is used to detect the temperature of the refrigerant flowing out of the second outdoor heat exchanger 33, and a second outlet temperature sensor 316 is provided at the outlet of the second battery cooler 35, which is used to monitor the temperature of the refrigerant flowing out of the second battery cooler 35. A third outlet temperature sensor 318 is provided at the outlet of the evaporator 36, which is used to monitor the temperature of the refrigerant flowing out of the evaporator.

[0095] See also Figure 2 In an embodiment of the present invention, the heat pump thermal management system 100 further includes a kettle 80, which is used to store coolant and to provide coolant, such as cooling water, to each water pump. The number of kettles 80 can be multiple or single, and each pump can correspond to one kettle 80, multiple pumps can correspond to one kettle 80, or multiple kettles 80 can correspond to one pump, which is not specifically limited here.

[0096] Next, various working modes of the heat pump thermal management system 100 of the present invention are introduced.

[0097] See also Figure 3In some embodiments, the heat pump thermal management system 100 has a passenger compartment cooling mode to cool the passenger compartment. Figure 3 FIG. 1 is a schematic diagram of the flow path of the heat pump thermal management system 100 in the passenger compartment cooling mode.

[0098] In the passenger compartment cooling mode, the second compressor 31 is started, the heating water pump 41 is turned off, and the remaining water pumps can choose to work or not work according to their respective needs. The first stop valve 34 and the second stop valve 38 are both cut off, the second throttling device 312 is in a fully open state, the third throttling device 313 is in a closed state, and the fourth throttling device 314 is in a throttling working state.

[0099] The second compressor 31 starts to output the refrigerant. After passing through the condenser 32 (the heating water pump 41 is not started, and the condenser 32 basically does not exchange heat), the refrigerant enters the second outdoor heat exchanger 33 through the second throttling device 312 for liquefaction and heat release, and then passes through the one-way valve 37 and the fourth throttling device 314 to enter the evaporator 36. The evaporator 36 cools the passenger compartment, that is, the refrigerant in the evaporator 36 absorbs the heat of the passenger compartment, and the refrigerant vaporizes after absorbing heat. The vaporized refrigerant flows out of the evaporator 36 to the gas-liquid separator, and finally returns to the second compressor 31 for the next cycle. It should be pointed out that Figure 3 The direction of the arrow on the path represents the flow direction of the refrigerant.

[0100] See also Figure 4 In some embodiments, the heat pump thermal management system 100 also has an air source heat pump heating mode to achieve heating of the passenger compartment. Figure 4 It is a flow path schematic diagram of the heat pump thermal management system 100 in the air source heat pump heating mode.

[0101] In this mode, the heating water pump 41 is turned on, and the other water pumps work according to their respective needs. The second compressor 31 is started, the first stop valve 34 is fully opened, the second stop valve 38 is closed, the first valve port i of the second five-way valve 43 is connected to the second valve port j, the one-way valve 37 is closed, and the third throttling device 313 is closed.

[0102] The second compressor 31 outputs the refrigerant, and the high-temperature and high-pressure superheated refrigerant reaches the condenser 32 through the exhaust temperature sensor 39. The refrigerant condenses and liquefies, and becomes a supercooled liquid at the outlet. At the same time, it releases heat to the heating circulation loop 40, and is throttled and reduced in pressure by the second throttling device 312. The low-temperature and low-pressure wet saturated refrigerant enters the second outdoor heat exchanger 33, absorbs heat from the environment through the first electronic fan 60, and then flows through the gas-liquid separator and the second low-pressure pressure sensor 310 to return to the second compressor 1 to complete the cycle. At the same time, the heating water pump 41 is started, and passes through the condenser 32, the first liquid heater 17, and the heater core 42 in turn, and finally returns to the heating water pump 41 to form a liquid side loop circulation, and the hot air is sent into the passenger compartment through the second electronic fan 70 to complete the heating of the passenger compartment. It can be understood that in such an implementation method, the first liquid heater 17 needs to feedback the outlet water temperature. If the first liquid heater 17 does not feedback, an additional water temperature sensor needs to be added. It should be pointed out that Figure 4 The direction of the arrows on each circuit represents the flow direction of the coolant and refrigerant.

[0103] See also Figure 5 In some embodiments, the heat pump thermal management system 100 also has a water source heat pump heating mode. Figure 5 It is a flow path schematic diagram of the heat pump thermal management system 100 in the water source heat pump heating mode.

[0104] In this mode, the second compressor 31 transmits the high-temperature and high-pressure superheated refrigerant to the condenser 32 through the exhaust temperature sensor 39, and the refrigerant is condensed and liquefied, becoming a supercooled liquid at the outlet, and at the same time releases heat to the heating circulation loop 40. At this time, the second throttling device 312 is in a closed state, the first stop valve 34 is closed, the second stop valve 38 is fully open, the third throttling device 313 is in a throttling state, and the fourth throttling device 314 is in a closed state. The refrigerant flowing out of the condenser 32 passes through the second stop valve 38 and then passes through the third throttling device 313 for throttling and pressure reduction. The low-temperature and low-pressure wet saturated refrigerant enters the second battery cooler 35 for evaporation and heat absorption, and finally returns to the second compressor 31 through the second outlet temperature sensor 316, the gas-liquid separator, and the second low-pressure pressure sensor 31 to complete the cycle.

[0105] In the coolant circuit, the battery water pump 11, the heating water pump 41 and the electric drive water pump 51 are all started. At this time, the first valve port d of the first five-way valve 15 is connected to the fourth valve port g, and the second valve port e is connected to the third valve port f; the first valve port i of the second five-way valve 43 is connected to the second valve port j, the third valve port k is connected to the fourth valve port m, and the first valve port a of the three-way valve 13 is connected to the second valve port b. Through the connection of these valves, the waste heat of the electric drive component 52 and the battery pack 12 is absorbed by the refrigerant in the second battery cooler 35, and then releases heat to the heating circulation loop 20 through the condenser 32 in the next cycle to complete the heating of the passenger compartment. It should be pointed out that Figure 5 The direction of the arrows on each circuit represents the flow direction of the coolant and refrigerant.

[0106] Also, see Figure 6 It can be understood that, in some embodiments, during heating, the second throttling device 312 can also be in a throttling state, the second one-way valve 37 is closed, and the second stop valve 38 is fully opened. In this way, a part of the refrigerant flowing out of the condenser 32 will flow into the second outdoor heat exchanger 33 after being throttled by the second throttling device 312 to absorb heat in the air to evaporate the refrigerant. In this way, the air source and the water source can be used to heat the passenger compartment at the same time, which can be called a dual-source heat pump heating mode (air source, electric drive heat source and battery waste heat). Figure 6 is a flow path schematic diagram of the heat pump thermal management system 100 in the dual-source heat pump heating mode, Figure 6 The direction of the arrows on each circuit represents the flow direction of the coolant and refrigerant.

[0107] See also Figure 7 In some embodiments, the heat pump thermal management system 100 also has a passenger compartment liquid heater heating mode. Figure 7 It is a schematic diagram of the flow path of the heat pump thermal management system 100 in the passenger compartment liquid heater heating mode, which mode can be used in extremely cold conditions.

[0108] In this mode, the heating water pump 41 and the second liquid heater 44 are started, the first valve port i of the second five-way valve 43 is connected to the second valve port j, the heating water pump 41 transports the liquid to the second liquid heater 44 for heating, and then the liquid enters the warm air core 42 to form warm air. It can be understood that in this case, the second liquid heater 44 needs to feedback the outlet water temperature. If no feedback is given, an additional water temperature sensor needs to be added. The second liquid heater 44 can adjust the output power according to the water temperature to ensure the heating comfort of the passenger compartment. Figure 7 The direction of the arrows on each circuit represents the flow direction of the coolant and refrigerant.

[0109] See also Figure 8 In some embodiments, the heat pump thermal management system 100 also has a passenger compartment electric drive waste heat heating mode. Figure 8 The flow path schematic diagram of the heat pump thermal management system 100 in the passenger compartment electric drive waste heat heating mode. In this mode, the heating water pump 41 is started, and the coolant passes through the second liquid heater 44 and the heater core 42 in sequence. At this time, the first valve port i of the second five-way valve 43 is connected to the fourth valve port m, the second valve port j is connected to the third valve port k, and the first valve port d of the first five-way valve 15 is connected to the second valve port e. In this way, the heating circulation loop 40 and the electric drive circulation loop 50 are connected in series to form an integral confluence, and then the waste heat of the electric drive component 52 is used to heat the passenger compartment. Figure 8The direction of the arrows on each circuit represents the flow direction of the coolant and refrigerant.

[0110] See also Fig. 9 In some embodiments, the heat pump thermal management system 100 also has a passenger compartment heating and dehumidification mode. Fig. 9 The flow path schematic diagram of the heat pump thermal management system 100 in the passenger compartment heating and dehumidification mode. In this mode, the second compressor 31 is started, the refrigerant flows through the condenser 32, the second throttling device 312 and the second outdoor heat exchanger 33 in sequence, the first electronic fan 60 is started, the fourth throttling device 314 is throttled, the evaporator 36 is working, the second stop valve 38 is fully opened, the first stop valve 34 is fully opened, a part of the refrigerant flowing out of the condenser 32 flows through the second outdoor heat exchanger 33 and is vaporized and then flows back to the second compressor 31 through the first stop valve 34, and the other part of the refrigerant flows from the second stop valve 38 into the evaporator 36 to evaporate and absorb heat, so that the evaporator 36 is refrigerated. The heating water pump 41 and the warm air core 42 are working, and the first valve port i of the second five-way valve 43 is connected with the second valve port j. In this mode, the heater core 42 absorbs the heat of the condenser 32 to form hot air through the operation of the heating water pump 41, and the refrigerant is introduced into the evaporator 36 for cooling. The hot air is dehumidified by the evaporator 36 and then blown into the passenger compartment to achieve heating and dehumidification. Fig. 9 The direction of the arrows on each circuit represents the flow direction of the coolant and refrigerant.

[0111] See also Fig.10 , the heat pump thermal management system 100 has a first battery cooling mode, Fig.10 FIG. 1 is a flow path schematic diagram of the heat pump thermal management system 100 in the first battery cooling mode.

[0112] In the first battery cooling mode, the first compressor 21 is turned off, the second compressor 31 is started, the heating water pump 41 is turned off, the battery water pump 11 is started, the first valve port a of the three-way valve 13 is connected to the second valve port b, and the first stop valve 34 and the second stop valve 38 are closed;

[0113] The refrigerant in the second refrigerant circulation loop 30 flows through the condenser 32, the second outdoor heat exchanger 33 and the second battery cooler 35 in sequence under the action of the second compressor 31, and then flows back to the second compressor 31; the coolant flows through the battery pack 12, the three-way valve 13, the second battery cooler 35, the water-to-water heat exchanger 14 and the first five-way valve 15 in sequence under the action of the battery water pump 11, and then flows back to the battery water pump 11;

[0114] The refrigerant releases heat and cools in the second outdoor heat exchanger 33 . The cooled refrigerant absorbs heat from the coolant and evaporates when flowing through the second battery cooler 35 to cool the coolant, thereby cooling the battery pack 12 .

[0115] Specifically, in such a mode, the third valve port f of the first five-way valve 15 is connected to the fourth valve port g, the first valve port a of the three-way valve 13 is connected to the second valve port b, and the battery circulation loop 10 and the electric drive circulation loop 50 are connected in parallel without interfering with each other.

[0116] In the second refrigerant circulation loop 30, high-temperature and high-pressure superheated gas comes out of the second compressor 31 and reaches the condenser 32. The heating water pump 41 is turned off. At this time, the condenser 32 does not participate in the heat exchange, the second throttling device 312 is fully open, and the first stop valve 34 and the second stop valve 38 are both closed. After the refrigerant reaches the second outdoor heat exchanger 33, the refrigerant condenses and liquefies, and becomes a supercooled liquid at the outlet. The heat is released to the environment through the first electronic fan 60, passes through the one-way valve 37, and then enters the second battery cooler 35 after the pressure is reduced by the third throttling device 313 to evaporate and absorb heat, and then returns to the second compressor 31 to complete the refrigerant cycle. At this time, the battery water pump 11 in the battery circulation loop 10 on the liquid side is started, and the coolant enters from the third valve port f of the first five-way valve 15, exits from the fourth valve port f, enters from the first valve port a of the three-way valve 13, and exits from the second valve port b, forming a liquid side circulation to complete the cooling of the battery pack 12. Fig.10 The direction of the arrows on each circuit represents the flow direction of the coolant and refrigerant.

[0117] See also Fig.11 In some embodiments, the heat pump thermal management system 100 has a second battery cooling mode. Fig.11 FIG. 1 is a flow path schematic diagram of the heat pump thermal management system 100 in the second battery cooling mode.

[0118] In the second battery cooling mode, the first compressor 21 is started, the battery water pump 11 is started, the heating water pump 41 is turned off, the battery water pump 11 is started, the first valve port a of the three-way valve 13 is connected to the third valve port c, and the first stop valve 34 and the second stop valve 38 are closed;

[0119] The refrigerant in the first refrigerant circulation loop 20 flows through the first outdoor heat exchanger 22 and the first battery cooler 23 in sequence under the action of the first compressor 21, and then flows back to the first compressor 21; the coolant flows through the battery pack 12, the three-way valve 13, the first battery cooler 23 and the first five-way valve 15 in sequence under the action of the battery water pump 11, and then flows back to the battery water pump 11;

[0120] The refrigerant releases heat and cools in the first outdoor heat exchanger 22 . The cooled refrigerant absorbs heat from the coolant and evaporates when flowing through the first battery cooler 23 to cool the coolant, thereby cooling the battery pack 12 .

[0121] Specifically, in this mode, the battery circulation loop 10 and the electric drive circulation loop 50 are connected in parallel and do not interfere with each other. In the first refrigerant circulation loop 20, the high-temperature and high-pressure superheated gas comes out of the first compressor 21 and reaches the first outdoor heat exchanger 22. The refrigerant condenses and liquefies, and becomes a supercooled liquid at the outlet. The heat is released to the environment through the first electronic fan 60, and then enters the first battery cooler 23 to evaporate and absorb heat, and finally returns to the first compressor 21 to complete the refrigerant cycle. At this time, the battery water pump 11 on the liquid side is started, and the coolant enters from the first valve port a of the three-way valve 13 and exits from the third valve port c. After the coolant flows through the first battery cooler 23 and is cooled, it enters from the third valve port f of the first five-way valve and exits from the fourth valve port g, and then returns to the battery water pump 11, forming a liquid side circulation, completing the cooling of the battery pack 12. Fig.11 The direction of the arrows on each circuit represents the flow direction of the coolant and refrigerant.

[0122] See also Fig.12 In some embodiments, the heat pump thermal management system 100 has a third battery cooling mode. Fig.11 is a schematic diagram of flow paths of the heat pump thermal management system 100 in the third battery cooling mode.

[0123] In the third battery cooling mode, the first compressor 21 and the second compressor 31 are both started, the battery water pump 11 is started, and the first valve port a of the three-way valve 13 is connected to the second valve port b and the third valve port c;

[0124] Under the action of the second compressor 31 , the refrigerant in the second refrigerant circulation circuit 30 flows through the condenser 32 , the second outdoor heat exchanger 33 , and the second battery cooler 35 in sequence, and then flows back into the second compressor 31 ;

[0125] Under the action of the first compressor 21 , the refrigerant in the first refrigerant circulation loop 20 flows through the first outdoor heat exchanger 22 and the first battery cooler 23 in sequence and then flows back into the first compressor 21 ;

[0126] The coolant flows through the battery pack 12 and the three-way valve 13 in sequence under the action of the battery water pump 11. The coolant is split at the three-way valve 13. One way flows out from the second valve port b of the three-way valve 13 and flows through the first battery cooler 23 and the first five-way valve 15 before flowing back to the battery water pump 11. The other way flows out from the third valve port c of the three-way valve 13 and flows through the first battery cooler 23 and the first five-way valve 15 before flowing back to the battery water pump 11.

[0127] The refrigerant in the second refrigerant circulation loop 30 dissipates heat and cools in the second outdoor heat exchanger 33. The cooled refrigerant absorbs heat from the coolant and evaporates when flowing through the second battery cooler 35, thereby cooling the coolant. The refrigerant in the first refrigerant circulation loop 20 dissipates heat and cools in the first outdoor heat exchanger 22. The cooled refrigerant absorbs heat from the coolant and evaporates when flowing through the first battery cooler 23, thereby cooling the coolant, thereby jointly cooling the battery pack 12.

[0128] Specifically, in this mode, the battery circulation loop 10 and the electric drive circulation loop 50 are connected in parallel without interfering with each other, thus meeting the maximum cooling capacity requirement of the battery pack. In the refrigerant circuit, the first compressor 21 and the second compressor 21 are started at the same time, and the refrigerant cycle is the same as the above two battery cooling modes. In the liquid-side battery circulation loop 20, the battery water pump 11 is started, and the coolant enters from the first valve port a of the three-way valve 13, and exits from the second valve port b and the third valve port c. The coolant flowing out of the second valve port b of the three-way valve 13 flows through the second battery cooler 35 and the water-to-water heat exchanger 14, and then enters from the third valve port f of the first five-way valve 15, and exits from the fourth valve port g. The coolant flowing out of the third valve port c of the three-way valve 13 flows through the first battery cooler 23 and then converges to the third valve port f of the first five-way valve 15, and returns to the battery water pump 11 through the fourth valve port g. Fig.12 The arrows on each circuit in the figure represent the flow direction of the coolant and refrigerant. In this way, the cooling capacity of the two refrigerant circulation circuits is transmitted and superimposed by the three-way valve 13 at the same time, which can meet the maximum cooling capacity requirement of the battery and solve the pain point of the large capacity and high cooling demand of the current battery pack 12 of the pure electric heavy truck.

[0129] See also Fig.13 In the embodiment of the present invention, the heat pump thermal management system 100 also has a battery natural heat dissipation mode. In the battery natural heat dissipation mode, the battery pack 12 and the electric drive component 52 in the heat pump thermal management system 100 can be naturally cooled. Fig.13 Schematic diagram of the flow path of the heat pump thermal management system 100 in the battery natural heat dissipation mode.

[0130] In this mode, at least one of the battery water pump 11 and the electric drive water pump 51 is started, the first valve port a of the three-way valve 13 is connected to the second valve port b, the third valve port f of the first five-way valve 15 is connected to the second valve port e, and the fourth valve port g is connected to the fifth valve port h. After the coolant is cooled by the radiator 53, the coolant flowing out of the radiator 53 flows into the fifth valve port h of the first five-way valve 15, and flows out from the fourth valve port g to return to the battery water pump 11. The battery water pump 11 transports the coolant to the battery pack 12, takes away the heat of the battery pack 12 to dissipate the heat of the battery pack 12, and avoids the battery pack 12 from being overheated.

[0131] After the coolant dissipates heat from the battery pack 12, the coolant flowing out of the battery pack 12 flows out from the first valve port a and the second valve port b of the three-way valve 13, and then flows through the water-to-water heat exchanger 14 and the third valve port f and the second valve port e of the first five-way valve into the electric drive water pump 51. The electric drive water pump 9 transports the coolant into the electric drive component 52. The coolant flows through the electric drive component 52 to cool down and dissipate heat for each component in the electric drive component 52, and finally flows out from the electric drive component 52 to the radiator 53. After the coolant returns to the radiator 53, the radiator 53 can dissipate heat for the coolant. The airflow formed by the first electronic fan 60 flowing through the radiator 53 can allow the coolant to fully exchange heat. Finally, the coolant flows out from the radiator 3 to the battery pack 12 and the electric drive component 524 for the next cycle. It should be pointed out that Fig.13 The direction of the arrow indicates the direction of coolant flow.

[0132] In this way, after the coolant is cooled by the temperature of the ambient air through the radiator 53, it flows to the battery pack 12 and the electric drive component 52 in turn for cooling, so that the battery pack 12 and the electric drive component 52 can share the same radiator 53 for natural heat dissipation and cooling, thereby reducing costs.

[0133] The battery natural mode is applicable to charging the vehicle in spring and autumn. When the vehicle is charging, the battery pack 12 and the electric drive component 52 will generate heat. Due to the low ambient temperature in spring and autumn, the heat dissipation of the battery pack 12 and the electric drive component 52 can be completed by using only the radiator 53, without starting the compressor, condenser 32 and battery cooler to assist in heat dissipation, so as to save electricity and improve charging efficiency.

[0134] See also Fig.14 The heat pump thermal management system 100 also has a battery liquid heater heating mode. Fig.14 The flow path schematic diagram of the heat pump thermal management system 100 in the battery liquid heater heating mode. In this mode, the heating circulation loop 40 and the battery circulation loop 10 work at the same time, and the refrigerant loop does not work, so that the capacity of the two liquid heaters (i.e., the first liquid heater 17 and the second liquid heater 44) is maximized to increase the heating capacity and meet the maximum heating demand of the battery pack.

[0135] Specifically, Fig.14 As shown, in this mode, the heating water pump 41 and the battery water pump 21 are started at the same time, the third valve port f of the first five-way valve 15 is connected to the fourth valve port g, the second valve port j of the second five-way valve 43 is connected to the fifth valve port n, and the first valve port a of the three-way valve 13 is connected to the second valve port b.

[0136] The second liquid heater 44 in the heating circulation loop 40 heats the liquid and then flows through the water-to-water heat exchanger 14 to transfer heat to the battery circulation loop 20. The first liquid heater 17 directly heats the liquid in the battery circulation loop 10, so that the two liquid heaters heat the battery pack 12 at the same time. The two liquid heaters adjust the output power according to the feedback of the first temperature sensor 16 at the inlet of the battery pack 12 to ensure a certain inlet water temperature of the battery pack 12. The battery water pump 21 adjusts the duty cycle according to the battery heating target water flow to ensure the battery pack heating water flow. It should be pointed out that Fig.14 The direction of the arrow indicates the direction of coolant flow.

[0137] See also Fig.15 In an embodiment of the present invention, the heat pump thermal management system 100 may also have an electric drive waste heat heating battery mode. The electric drive waste heat heating battery mode utilizes waste heat from the electric drive component 52 to recover the battery for heating and heat preservation, or in other words, the heat of the electric drive component 52 is recovered by controlling the connection state of the first five-way valve 15 and the second five-way valve 43 to heat and heat the battery pack 12. Fig.15 It is a schematic diagram of the flow path of the heat pump thermal management system 100 in the electric drive waste heat heating battery mode.

[0138] In the electric drive waste heat heating battery mode, in this mode, the battery circulation loop 10 is connected in series with the electric drive circulation loop 50 to recover the waste heat of the electric drive component 52 to keep the battery pack 12 warm. In this mode, the first valve port a of the three-way valve 13 is connected to the second valve port b, the first valve port d of the first five-way valve 15 is connected to the fourth valve port g, the second valve port e is connected to the third valve port f, the third valve port k of the second five-way valve 43 is connected to the fourth valve port m, at least one of the battery water pump 11 and the electric drive water pump 51 is started, and the coolant flows through the electric drive component 52 to recover heat, flows through the third valve port k and the fourth valve port m of the second five-way valve 43 and the first valve port d and the fourth valve port g of the first five-way valve 15, then flows through the battery water pump 21 and flows through the battery pack 12 to keep the battery pack warm, and then flows out from the first valve port a and the second valve port b of the three-way valve 13, enters from the third valve port f of the first five-way valve 15, and flows out from the second valve port e to the electric drive water pump 51 to enter the next cycle. It should be pointed out that Fig.15 The direction of the arrow indicates the direction of coolant flow.

[0139] In this mode, the electric drive component 52 needs to feed back the inlet and outlet water temperature signals of the electric drive component 52. If there is no feedback, an additional water temperature sensor needs to be added. According to the temperature feedback, the flow rate of the water pump and the position opening of each valve can be accurately controlled to recover the waste heat of the electric drive into the battery.

[0140] It is understandable that in this mode, the coolant does not flow through the radiator 53 , which can prevent the heat of the recovered electric drive component 52 from being dissipated into the environment in the radiator 53 .

[0141] See also Fig.16 In an embodiment of the present invention, the heat pump thermal management system 100 has a natural cooling mode for the electric drive circuit. Fig.16 It is a schematic diagram of the flow path of the heat pump thermal management system 100 in the electric drive waste heat heating battery mode.

[0142] In this mode, the second valve port e of the first five-way valve 15 is connected to the fifth valve port h, the electric drive water pump 51 is started, and the electric drive circulation loop 50 operates independently. Under the action of the electric drive water pump 51, the coolant flows through the electric drive component 52 to absorb heat, and then flows into the radiator 53 to dissipate heat. After the coolant is cooled by the radiator 53, the coolant flowing out of the radiator 53 enters from the fifth valve port h of the first five-way valve 15, and flows out from the second valve port e of the first five-way valve 15 back to the electric drive water pump 51 to enter the next cycle. It should be pointed out that Fig.16 The direction of the arrow indicates the direction of coolant flow.

[0143] In summary, in the heat pump thermal management system of the present invention, by setting a three-way valve and two five-way valves, the two refrigerant circulation circuits and the battery circulation circuit, the heating circulation circuit and the electric drive circulation circuit can be cleverly combined. By controlling the state of each valve, the cooling and heat dissipation needs of the large-capacity battery pack of a heavy truck can be met.

[0144] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0145] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A heat pump thermal management system for a heavy truck, characterized in that: The heat pump thermal management system comprises: A battery circulation loop, comprising a battery water pump, a battery pack, a three-way valve, a water-to-water heat exchanger and a first five-way valve connected in sequence, wherein a first valve port and a second valve port of the three-way valve are connected between the battery pack and the water-to-water heat exchanger; A first refrigerant circulation loop includes a first compressor, a first outdoor heat exchanger and a first battery cooler connected in sequence, the third valve port of the three-way valve is connected to the coolant inlet of the first battery cooler, and the coolant outlet of the first battery cooler is connected to the pipeline between the water-to-water heat exchanger and the first five-way valve; A second refrigerant circulation circuit comprises a second compressor, a condenser, and a second outdoor heat exchanger connected in sequence, a first stop valve is provided between the second outdoor heat exchanger and the second compressor, the second refrigerant circulation circuit also comprises a second battery cooler and an evaporator, the refrigerant inlet of the second battery cooler is connected between the second outdoor heat exchanger and the first stop valve, and a one-way valve is provided at the refrigerant inlet of the second battery cooler; the refrigerant outlet of the second battery cooler is connected to the second compressor, the coolant inlet of the second battery cooler is connected to the first coolant inlet and the first coolant outlet of the water-to-water heat exchanger, the first coolant inlet of the water-to-water heat exchanger is connected to the second valve port of the three-way valve, and the first coolant outlet of the water-to-water heat exchanger is connected to the first five-way valve; the inlet of the evaporator is connected to the pipeline between the condenser and the second outdoor heat exchanger, a second stop valve is provided on the pipeline connecting the inlet of the evaporator, the pipeline between the second stop valve and the evaporator is connected to the pipeline between the one-way valve and the second battery cooler, and the outlet of the evaporator is connected to the second compressor; and A heating circulation loop includes a heating water pump, a heater core and a second five-way valve connected in sequence, the coolant pipeline of the condenser is connected between the heating water pump and the heater core, the outlet of the heater core is connected to the second five-way valve, the second coolant inlet of the water-to-water heat exchanger is connected between the condenser and the inlet of the heater core, and the second coolant outlet of the water-to-water heat exchanger is connected to the second five-way valve.

2. The heat pump thermal management system for heavy trucks according to claim 1, characterized in that: The heat pump thermal management system further comprises an electric drive circulation loop, wherein the electric drive circulation loop comprises an electric drive water pump, an electric drive component and a radiator connected in sequence; The first valve port of the first five-way valve is connected to the fourth valve port of the second five-way valve, the second valve port of the first five-way valve is connected to the inlet of the electric drive water pump, the third valve port of the first five-way valve is connected to the first coolant outlet of the water-to-water heat exchanger, the fourth valve port of the first five-way valve is connected to the battery water pump, and the fifth valve port of the first five-way valve is connected to the outlet of the radiator; The first valve port of the second five-way valve is connected to the outlet of the heater core, the second valve port of the second five-way valve is connected to the heating water pump, the third valve port of the second five-way valve is connected to the pipeline between the electric drive component and the radiator, the fourth valve port of the second five-way valve is connected to the first valve port of the first five-way valve, and the fifth valve port of the second five-way valve is connected to the second coolant outlet of the water-to-water heat exchanger.

3. The heat pump thermal management system for heavy trucks according to claim 1, characterized in that: A first temperature sensor and a first liquid heater are provided between the battery pack and the battery water pump.

4. The heat pump thermal management system for a heavy truck according to claim 1, characterized in that: A second temperature sensor is provided between the battery pack and the first valve port of the three-way valve.

5. The heat pump thermal management system for a heavy truck according to claim 1, characterized in that: A first low-pressure pressure sensor is provided at the refrigerant outlet of the first battery cooler, a first throttling device is provided at the refrigerant inlet of the first battery cooler, and a first high-pressure pressure sensor is provided at the outlet of the first compressor.

6. The heat pump thermal management system for a heavy truck according to claim 1, characterized in that: An exhaust temperature sensor is provided at the outlet of the second compressor, a second low-pressure pressure sensor is provided at the inlet of the second compressor, a second high-pressure pressure sensor is provided at the refrigerant outlet of the condenser, a second throttling device is provided at the inlet of the second outdoor heat exchanger, a third throttling device is provided at the refrigerant inlet of the second battery cooler, and a fourth throttling device is provided at the inlet of the evaporator.

7. The heat pump thermal management system for a heavy truck according to claim 1, characterized in that: The heat pump thermal management system has a first battery cooling mode; In the first battery cooling mode, the first compressor is turned off, the second compressor is turned on, the heating water pump is turned off, the battery water pump is turned on, and the first valve port of the three-way valve is connected to the second valve port; The refrigerant in the second refrigerant circulation circuit flows through the condenser, the second outdoor heat exchanger and the second battery cooler in sequence under the action of the second compressor and then flows back into the second compressor; Under the action of the battery water pump, the coolant flows through the battery pack, the three-way valve, the second battery cooler, the water-to-water heat exchanger and the first five-way valve in sequence and then flows back to the battery water pump; The refrigerant releases heat and cools in the second outdoor heat exchanger. When the cooled refrigerant flows through the second battery cooler, it absorbs heat in the coolant and evaporates to cool the coolant, thereby cooling the battery pack.

8. The heat pump thermal management system for a heavy truck according to claim 1, characterized in that: The heat pump thermal management system has a second battery cooling mode; In the second battery cooling mode, the first compressor is started, the battery water pump is started, the heating water pump is turned off, the battery water pump is started, and the first valve port of the three-way valve is connected to the third valve port; Under the action of the first compressor, the refrigerant in the first refrigerant circulation circuit flows through the first outdoor heat exchanger and the first battery cooler in sequence and then flows back into the first compressor; Under the action of the battery water pump, the coolant flows through the battery pack, the three-way valve, the first battery cooler and the first five-way valve in sequence and then flows back to the battery water pump; The refrigerant releases heat and cools in the first outdoor heat exchanger. The cooled refrigerant absorbs heat from the coolant and evaporates when flowing through the first battery cooler to cool the coolant, thereby cooling the battery pack.

9. The heat pump thermal management system for a heavy truck according to claim 1, characterized in that: The heat pump thermal management system has a third battery cooling mode; In the third battery cooling mode, the first compressor and the second compressor are both started, the battery water pump is started, and the first valve port of the three-way valve is connected to the second valve port and the third valve port; The refrigerant in the second refrigerant circulation circuit flows through the condenser, the second outdoor heat exchanger and the second battery cooler in sequence under the action of the second compressor and then flows back into the second compressor; Under the action of the first compressor, the refrigerant in the first refrigerant circulation circuit flows through the first outdoor heat exchanger and the first battery cooler in sequence and then flows back into the first compressor; The coolant flows through the battery pack and the three-way valve in sequence under the action of the battery water pump. The coolant is split at the three-way valve. One path flows out from the second valve port of the three-way valve and flows through the first battery cooler and the first five-way valve before flowing back to the battery water pump. The other path flows out from the third valve port of the three-way valve and flows through the first battery cooler and the first five-way valve before flowing back to the battery water pump. The refrigerant in the second refrigerant circulation loop releases heat and cools in the second outdoor heat exchanger, and the cooled refrigerant absorbs heat from the coolant and evaporates when flowing through the second battery cooler, thereby cooling the coolant. The refrigerant in the first refrigerant circulation loop releases heat and cools in the first outdoor heat exchanger, and the cooled refrigerant absorbs heat from the coolant and evaporates when flowing through the first battery cooler, thereby cooling the coolant, thereby jointly cooling the battery pack.

10. A heavy truck, characterized in that: include: Vehicle body; and The heat pump thermal management system according to any one of claims 1 to 9, wherein the heat pump thermal management system is installed on the vehicle body.

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