Vehicle-mounted heat pump system and vehicle

Abstract

The invention belongs to the field of heat pump systems, and particularly relates to a vehicle-mounted heat pump system and a vehicle, a first compressor and a second compressor are arranged, a heat source and a cold source are provided by the two compressors, a PTC heater is used for heating assistance, and a refrigerant loop is switched in cooperation with a first labyrinth valve and a second labyrinth valve; when the driving system works, waste heat generated when the driving system works can be used for heating the battery pack, in the heating mode, the liquid cooling condenser can be used as an evaporator (cooling high-temperature cooling liquid in the second cooling liquid pipeline), in the system refrigeration mode, the liquid cooling condenser can be used as a condenser (cooling the liquid cooling condenser through a radiator), and the scheme that the two compressors are connected in parallel is adopted; the compressor cost is controllable, the double-compressor scheme is adopted, the refrigerating capacity adjusting range is wide, the adaptive capacity is high, and the problems that a single-compressor system is insufficient in refrigerating capacity, and large-refrigerating-capacity compressor products are immature and high in price are solved. In addition, the heat pump unit is high in integration level and convenient to install and arrange.

Description

Technical Field

[0001] The present application relates to the technical field of heat pump systems, and in particular to a vehicle-mounted heat pump system and a vehicle. Background Art

[0002] The vehicle heat pump system is an efficient and environmentally friendly thermal management system that is widely used in new energy vehicles for cooling and heating.

[0003] The existing mature single compressor heat pump systems on the market do not have enough cooling capacity, while large cooling capacity compressor products are immature and expensive. In addition, the components of vehicle heat pump systems on the market are mainly distributed in the vehicle, and there is no integrated unit that provides vehicle heat and cold sources. Summary of the invention

[0004] The embodiments of the present application provide a vehicle-mounted heat pump system and a vehicle to solve the above-mentioned problems.

[0005] To this end, according to one aspect of the present application, there is provided a vehicle-mounted heat pump system, comprising a heat pump unit, a passenger compartment condenser, a passenger compartment evaporator, a four-way valve, a battery heat exchanger, a PTC heater, a drive system heat exchanger, and a radiator;

[0006] The heat pump unit includes a first compressor, a second compressor, a first labyrinth valve, a second labyrinth valve, a liquid-cooled condenser, a first battery panel exchanger and a second battery panel exchanger; the first labyrinth valve and the second labyrinth valve are both provided with an air inlet, an air outlet and four groups of interfaces, each group of interfaces includes an outlet and an inlet, and the four groups of interfaces are respectively a first group of interfaces, a second group of interfaces, a third group of interfaces and a fourth group of interfaces; the first compressor is connected in series between the air inlet and the air outlet of the first labyrinth valve, the passenger compartment condenser is connected in series between the outlet and the inlet of the first group of interfaces of the first labyrinth valve, and the passenger compartment evaporator is connected in series between the second group of interfaces of the first labyrinth valve The refrigerant passage of the liquid-cooled condenser is connected in series between the outlet and inlet of the third group of interfaces of the first labyrinth valve, and the refrigerant passage of the first battery panel exchanger is connected in series between the outlet and inlet of the fourth group of interfaces of the first labyrinth valve; the second compressor is connected in series between the air inlet and the air outlet of the second labyrinth valve, the outlet and the inlet of the first group of interfaces of the second labyrinth valve are connected, the refrigerant passage of the liquid-cooled condenser is also connected in series between the outlet and the inlet of the third group of interfaces of the second labyrinth valve, and the refrigerant passage of the second battery panel exchanger is connected in series between the outlet and the inlet of the fourth group of interfaces of the second labyrinth valve;

[0007] The PTC heater, the first liquid pump, the coolant passage of the second battery panel, the coolant passage of the first battery panel, and the battery heat exchanger are sequentially connected in series between one inlet and outlet of the four-way valve through the first coolant pipeline; the radiator, the second liquid pump, and the liquid-cooled condenser are sequentially connected in series between another inlet and outlet of the four-way valve through the second coolant pipeline, and the drive system heat exchanger is connected in parallel with the radiator through a pipeline.

[0008] Optionally, the first battery plate exchanger and the second battery plate exchanger have the same structure, both comprising a plate exchanger body and a refrigerant cavity and a cooling liquid cavity which are arranged inside the plate exchanger body and isolated from each other, the plate exchanger body is provided with a refrigerant inlet and a refrigerant outlet which are communicated with the refrigerant cavity, and the plate exchanger body is provided with a cooling liquid inlet and a cooling liquid outlet which are communicated with the cooling liquid cavity;

[0009] Or, the second battery plate exchanger includes a first plate exchanger and a second plate exchanger connected to each other, the first plate exchanger has a refrigerant passage and a coolant passage isolated from each other, the refrigerant passage of the first plate exchanger is connected in series between the outlet and the inlet of the fourth group of interfaces of the second labyrinth valve; the second plate exchanger has a coolant inlet joint, a coolant outlet joint and a refrigerant passage isolated from each other, the coolant inlet joint and the coolant outlet joint are connected to the coolant passage of the first plate exchanger, the coolant passage of the first plate exchanger is connected in series to the first coolant pipeline through the coolant inlet joint and the coolant outlet joint, and the refrigerant passage of the second plate exchanger is connected in series between the outlet and the inlet of the second group of interfaces of the second labyrinth valve.

[0010] Optionally, the on-board heat pump system has a single passenger compartment cooling mode, a single battery pack cooling mode, a passenger compartment and battery pack cooling mode, a single passenger compartment heating mode, a single battery pack heating mode, a passenger compartment and battery pack heating mode, a passenger compartment heating and dehumidification mode, a battery pack direct heat dissipation mode, a drive system heat dissipation mode, and a drive system battery pack heating mode.

[0011] Optionally, in the single passenger compartment refrigeration mode, the second compressor and the second labyrinth valve do not work. Under the action of the first compressor and the first labyrinth valve, the refrigerant circulates between the passenger compartment evaporator, the first compressor and the liquid-cooled condenser. Driven by the second liquid pump, the coolant in the second coolant pipeline flows and takes away the heat in the drive system heat exchanger and the liquid-cooled condenser through the radiator.

[0012] Optionally, in the single battery pack cooling mode, the PTC heater does not work. When only the first compressor works, under the action of the first compressor and the first labyrinth valve, the refrigerant circulates between the refrigerant passage of the first battery panel, the first compressor and the liquid-cooled condenser. Driven by the first liquid pump, the coolant in the first coolant pipeline flows to dissipate heat for the battery pack; driven by the second liquid pump, the coolant in the second coolant pipeline flows to take away the heat in the drive system heat exchanger and the liquid-cooled condenser through the radiator.

[0013] When the second compressor is put into operation, under the action of the second compressor and the second labyrinth valve, the refrigerant circulates between the refrigerant passage of the second battery plate exchanger, the second compressor and the liquid-cooled condenser.

[0014] Optionally, in the passenger compartment and battery pack cooling mode, based on the single battery pack cooling mode, the refrigerant is divided into two paths after coming out of the liquid-cooled condenser, one path enters the passenger compartment evaporator, and the other enters the refrigerant passage exchanged by the first battery panel. The cooling capacity of the two paths can be adjusted by the electronic expansion valve on the first labyrinth valve.

[0015] Optionally, in the direct heat dissipation mode of the battery pack, both the first compressor and the second compressor do not work, and the first coolant pipeline and the second coolant pipeline are connected to form a loop by switching the four-way valve. Driven by the first liquid pump and the second liquid pump, the coolant flows in the loop and takes away the heat in the coolant through the radiator.

[0016] Optionally, in the heat dissipation mode of the drive system, both the first compressor and the second compressor do not work, and the coolant flows in the second coolant pipeline under the drive of the second liquid pump, and the heat in the coolant is taken away through the radiator.

[0017] According to another aspect of the present application, a vehicle is provided, comprising the vehicle-mounted heat pump system as described above.

[0018] The beneficial effects of the vehicle-mounted heat pump system and vehicle provided by the present application are:

[0019] By setting the first compressor and the second compressor, the two compressors provide heat source and cold source, the PTC heater assists in heating, and cooperates with the first labyrinth valve and the second labyrinth valve to switch the refrigerant circuit. The waste heat of the drive system when working can be used to heat the battery pack. In heating mode, the liquid-cooled condenser can be used as an evaporator (to cool the high-temperature coolant in the second coolant pipeline), and in system cooling mode, the liquid-cooled condenser can be used as a condenser (the radiator cools the liquid-cooled condenser). By adopting two compressors in parallel, the compressor cost is controllable, and the dual compressor solution has a wide range of cooling capacity adjustment and strong adaptability, which solves the problems of insufficient cooling capacity of single-compressor system, immature large-cooling capacity compressor products and high prices. In addition, the heat pump unit has a high degree of integration and is easy to install and arrange. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] in:

[0022] Figure 1 is a schematic diagram of the overall structure of a vehicle-mounted heat pump system shown in one embodiment of the present application;

[0023] Figure 2 It is a schematic diagram of the structure of two different second battery panels in a vehicle-mounted heat pump system shown in an embodiment of the present application;

[0024] Figure 3 is a schematic diagram of a vehicle heat pump system in a single passenger compartment cooling mode shown in an embodiment of the present application;

[0025] Figure 4 1 is a schematic diagram of a vehicle heat pump system in a single battery pack cooling mode shown in an embodiment of the present application, wherein FIG. (a) is a schematic diagram when only the first compressor is working, and FIG. (b) is a schematic diagram when both the first compressor and the second compressor are working;

[0026] Figure 5 is a schematic diagram of an on-vehicle heat pump system in a passenger compartment and battery pack cooling mode shown in an embodiment of the present application;

[0027] Figure 6 is a schematic diagram of a vehicle heat pump system in a single passenger compartment heating mode shown in an embodiment of the present application;

[0028] Figure 71 is a schematic diagram of a vehicle heat pump system in a single battery pack heating mode shown in an embodiment of the present application, wherein FIG. (a) is a schematic diagram when only the first compressor is working, and FIG. (b) is a schematic diagram when both the first compressor and the second compressor are working;

[0029] Figure 8 is a schematic diagram of a vehicle heat pump system in a passenger compartment and battery pack heating mode shown in an embodiment of the present application;

[0030] Fig. 9 is a schematic diagram of a vehicle heat pump system in a passenger compartment heating and dehumidification mode shown in an embodiment of the present application;

[0031] Fig.10 is a schematic diagram of an on-vehicle heat pump system in a battery pack direct heat dissipation mode / a drive system heating battery pack mode shown in an embodiment of the present application;

[0032] Fig.11 It is a schematic diagram of a vehicle-mounted heat pump system in a drive system heat dissipation mode shown in an embodiment of the present application.

[0033] Description of reference numerals:

[0034] 1. Heat pump unit; 11. First compressor; 12. Second compressor; 13. First labyrinth valve; 14. Second labyrinth valve; 15. Liquid-cooled condenser; 16. First battery plate exchanger; 17. Second battery plate exchanger; 171. First plate exchanger; 172. Second plate exchanger;

[0035] 2. Passenger compartment condenser; 3. Passenger compartment evaporator; 4. Four-way valve; 5. Battery heat exchanger; 6. PTC heater; 7. Drive system heat exchanger; 8. Radiator; 9. Second liquid pump; 10. First liquid pump. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the present application, the present application will be described more comprehensively with reference to the relevant drawings below. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many other different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0037] It should be noted that when an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] As described in the background technology, the existing mature single compressor heat pump system on the market has insufficient cooling capacity, while large cooling capacity compressor products are immature and expensive. In addition, the components of the vehicle heat pump system on the market are mainly arranged in a scattered manner on the vehicle, and there is no integrated unit that provides vehicle heat source and cold source.

[0040] In order to solve the above problems, according to one aspect of the present application, an embodiment of the present application provides a vehicle heat pump system, such as Figure 1 As shown, the vehicle-mounted heat pump system includes a heat pump unit 1, a passenger compartment condenser 2, a passenger compartment evaporator 3, a four-way valve 4, a battery heat exchanger 5, a PTC heater 6, a drive system heat exchanger 7, and a radiator 8; wherein the battery heat exchanger 5 is used to cool / heat the battery pack, and the drive system heat exchanger 7 is used to cool / heat the drive system.

[0041] The heat pump unit 1 includes a first compressor 11, a second compressor 12, a first labyrinth valve 13, a second labyrinth valve 14, a liquid-cooled condenser 15, a first battery panel exchanger 16 and a second battery panel exchanger 17; the first labyrinth valve 13 and the second labyrinth valve 14 are both provided with an air inlet, an air outlet and four groups of interfaces, each group of interfaces includes an outlet and an inlet, and the four groups of interfaces are respectively a first group of interfaces, a second group of interfaces, a third group of interfaces and a fourth group of interfaces; the first compressor 11 is connected in series between the air inlet and the air outlet of the first labyrinth valve 13, the passenger compartment condenser 2 is connected in series between the outlet and the inlet of the first group of interfaces of the first labyrinth valve 13, and the passenger compartment evaporator 3 is connected in series between the first labyrinth valve 13 and the first group of interfaces. The refrigerant passage of the liquid-cooled condenser 15 is connected in series between the outlet and the inlet of the third group of interfaces of the first labyrinth valve 13, and the refrigerant passage of the first battery plate exchanger 16 is connected in series between the outlet and the inlet of the fourth group of interfaces of the first labyrinth valve 13; the second compressor 12 is connected in series between the air inlet and the air outlet of the second labyrinth valve 14, and the outlet and the inlet of the first group of interfaces of the second labyrinth valve 14 are connected, the refrigerant passage of the liquid-cooled condenser 15 is also connected in series between the outlet and the inlet of the third group of interfaces of the second labyrinth valve 14, and the refrigerant passage of the second battery plate exchanger 17 is connected in series between the outlet and the inlet of the fourth group of interfaces of the second labyrinth valve 14;

[0042] The PTC heater 6, the first liquid pump 10, the coolant passage of the second battery panel exchanger 17, the coolant passage of the first battery panel exchanger 16, and the battery heat exchanger 5 are sequentially connected in series between one inlet and outlet of the four-way valve 4 through the first coolant pipeline; the radiator 8, the second liquid pump 9, and the liquid-cooled condenser 15 are sequentially connected in series between the other inlet and outlet of the four-way valve 4 through the second coolant pipeline, and the drive system heat exchanger 7 is connected in parallel with the radiator 8 through a pipeline.

[0043] Specifically, the four-way valve 4 has a first inlet, a first outlet, a second inlet, and a second outlet. The PTC heater 6, the first liquid pump 10, the second battery panel exchanger 17, the first battery panel exchanger 16, and the battery heat exchanger 5 are sequentially connected in series between the first inlet and the first outlet of the four-way valve 4 through the first coolant pipeline. The radiator 8, the second liquid pump 9, and the liquid-cooled condenser 15 are sequentially connected in series between the second inlet and the second outlet of the four-way valve 4 through the second coolant pipeline. The four-way valve 4 has two working states: one, the first inlet is connected to the first outlet, and the second inlet is connected to the second outlet; two, the first inlet is connected to the second outlet, and the second inlet is connected to the first outlet.

[0044] It should be noted that the coolant in the first coolant pipeline and the second coolant pipeline can be water, and the radiator 8 can be an air-cooled radiator 8 equipped with a cooling fan.

[0045] The first labyrinth valve 13 and the second labyrinth valve 14 used in this application are both prior art. The specific structure and principle thereof can be found in the labyrinth valve in the patent with the announcement number CN 221525641 U and the patent name "A labyrinth valve, vehicle thermal management system and new energy vehicle", which will not be described here. The labyrinth valve is used to switch the flow direction of the refrigerant, and the electronic expansion valve is used to adjust the refrigerant flow to adjust the cooling capacity and heating capacity.

[0046] In the embodiment of the present application, the vehicle-mounted heat pump system is provided with a first compressor 11 and a second compressor 12, and the two compressors provide heat source and cold source, and the PTC heater 6 assists in heating, and cooperates with the first labyrinth valve 13 and the second labyrinth valve 14 to switch the refrigerant circuit. The waste heat of the drive system when working can be used to heat the battery pack. In the heating mode, the liquid-cooled condenser 15 can be used as an evaporator (to cool the high-temperature coolant in the second coolant pipeline), and in the system cooling mode, the liquid-cooled condenser 15 can be used as a condenser (the radiator 8 cools the liquid-cooled condenser 15). By adopting a parallel solution of two compressors, the compressor cost is controllable, and the dual compressor solution has a wide range of cooling capacity adjustment and strong adaptability, which solves the problems of insufficient cooling capacity of a single compressor system, immature large cooling capacity compressor products and high prices; in addition, the heat pump unit 1 has a high degree of integration and is easy to install and arrange.

[0047] In one implementation, Figure 1-Figure 2 As shown in (a), the first battery panel exchanger 16 and the second battery panel exchanger 17 have the same structure, both including a panel exchanger body and a refrigerant cavity and a cooling liquid cavity which are arranged inside the panel exchanger body and isolated from each other. The panel exchanger body is provided with a refrigerant inlet and a refrigerant outlet which are connected to the refrigerant cavity, and the panel exchanger body is provided with a cooling liquid inlet and a cooling liquid outlet which are connected to the cooling liquid cavity. It can be understood that the refrigerant inlet, the refrigerant cavity and the refrigerant outlet constitute the refrigerant passage of the first battery panel exchanger 16 / the second battery panel exchanger 17. The cooling liquid inlet, the cooling liquid cavity and the cooling liquid outlet constitute the cooling liquid passage of the first battery panel exchanger 16 / the second battery panel exchanger 17.

[0048] In another implementation, Figure 1-Figure 2 As shown in (b), the second battery plate changer 17 includes a first plate changer 171 and a second plate changer 172 that are interconnected. The first plate changer 171 has a refrigerant passage and a coolant passage that are isolated from each other. The refrigerant passage of the first plate changer 171 is connected in series between the outlet and the inlet of the fourth group of interfaces of the second labyrinth valve 14; the second plate changer 172 has a coolant inlet connector, a coolant outlet connector and a refrigerant passage that are isolated from each other. The coolant inlet connector and the coolant outlet connector are connected to the coolant passage of the first plate changer 171. The coolant passage of the first plate changer 171 is connected in series to the first coolant pipeline through the coolant inlet connector and the coolant outlet connector. The refrigerant passage of the second plate changer 172 is connected in series between the outlet and the inlet of the second group of interfaces of the second labyrinth valve 14.

[0049] The vehicle-mounted heat pump system provided in the embodiment of the present application has multiple operating modes, specifically, including a single passenger compartment cooling mode, a single battery pack cooling mode, a passenger compartment and battery pack cooling mode, a single passenger compartment heating mode, a single battery pack heating mode, a passenger compartment and battery pack heating mode, a passenger compartment heating and dehumidification mode, a battery pack direct heat dissipation mode, a drive system heat dissipation mode, and a drive system battery pack heating mode.

[0050] like Figure 3 As shown, in the single passenger compartment cooling mode, the second compressor 12 and the second labyrinth valve 14 do not work. Under the action of the first compressor 11 and the first labyrinth valve 13, the refrigerant circulates between the passenger compartment evaporator 3, the first compressor 11 and the liquid-cooled condenser 15. Driven by the second liquid pump 9, the coolant in the second coolant pipeline flows and takes away the heat in the drive system heat exchanger 7 and the liquid-cooled condenser 15 through the radiator 8.

[0051] It can be understood that the first compressor 11 transports the high-temperature refrigerant to the liquid-cooled condenser 15 through the first labyrinth valve 13 for heat dissipation. The heat in the liquid-cooled condenser 15 is taken away by the radiator 8. The cooled refrigerant enters the passenger compartment evaporator 3 through the first labyrinth valve 13 for heat absorption and cooling, and then returns to the first compressor 11. The radiator 8 takes away the heat in the drive system and the liquid-cooled condenser 15.

[0052] like Figure 4 As shown, in the single battery pack cooling mode, the PTC heater 6 does not work, and when only the first compressor 11 works, as shown in FIG. Figure 4 As shown in (a), under the action of the first compressor 11 and the first labyrinth valve 13, the refrigerant circulates between the refrigerant passage of the first battery panel exchanger 16, the first compressor 11 and the liquid-cooled condenser 15. Driven by the first liquid pump 10, the coolant in the first coolant pipeline flows to dissipate heat from the battery pack; driven by the second liquid pump 9, the coolant in the second coolant pipeline flows and takes away the heat in the drive system heat exchanger 7 and the liquid-cooled condenser 15 through the radiator 8. When the second compressor 12 intervenes, as shown in FIG. Figure 4 As shown in (b), under the action of the second compressor 12 and the second labyrinth valve 14, the refrigerant circulates between the refrigerant passage of the second battery plate exchanger 17, the second compressor 12 and the liquid-cooled condenser 15.

[0053] It can be understood that when a single compressor is working, the first compressor 11 discharges high-temperature and high-pressure refrigerant through the liquid-cooled condenser 15 (heat dissipation), the heat in the liquid-cooled condenser 15 is taken away by the radiator 8, and the refrigerant then enters the first battery panel exchanger 16 through the first labyrinth valve 13 (absorbing heat to lower the liquid temperature in the first coolant pipeline), and the first liquid pump 10 works to drive the low-temperature refrigeration coolant to cool the battery pack. At this time, the second battery panel exchanger 17 and the PTC heater 6 on the second labyrinth valve 14 are only channels for the coolant.

[0054] When the dual compressors are working, the first compressor 11 and the second compressor 12 discharge high-temperature and high-pressure refrigerant through the liquid-cooled condenser 15 (heat dissipation). The heat of the liquid-cooled condenser 15 is taken away by the radiator 8, and the refrigerant returns to the first labyrinth valve 13 and the second labyrinth valve 14 respectively. The first liquid pump 10 works through the four-way valve 4 to drive the low-temperature refrigeration coolant to cool the battery pack. At this time, the PTC heater 6 is only a channel for the coolant.

[0055] like Figure 5 As shown, in the passenger compartment and battery pack cooling mode, based on the above-mentioned single battery pack cooling mode, the refrigerant is divided into two paths after coming out of the liquid-cooled condenser 15, one path enters the passenger compartment evaporator 3, and the other path enters the refrigerant passage of the first battery panel exchanger 16. The cooling capacity of the two paths can be adjusted by the electronic expansion valve on the first labyrinth valve 13.

[0056] like Figure 6 As shown, in the single passenger compartment heating mode, the first compressor 11 discharges high-temperature and high-pressure gas refrigerant which first passes through the passenger compartment condenser 2 (heat release for heating), and then goes to the liquid-cooled condenser 15 (evaporation and heat absorption, absorbing heat from the drive system). In this mode, the cooling fan of the radiator 8 is generally turned off, and the cooling fan is only considered to be turned on when the water temperature in the second coolant pipeline is particularly high.

[0057] like Figure 7 As shown, in the single battery pack heating mode, when only the second compressor 12 is working, as shown in FIG. Figure 7 As shown in (a), the high-temperature and high-pressure gas refrigerant discharged by the second compressor 12 first passes through the second battery plate exchanger 17 (releasing heat to heat the coolant in the first coolant pipeline), and then to the liquid-cooled condenser 15 (evaporating and absorbing heat from the drive system). In this mode, the cooling fan is generally turned off, and the cooling fan is only considered to be turned on when the water temperature of the drive system is particularly high. In this mode, the PTC heater 6 does not start auxiliary heating, and the first liquid pump 10 drives the coolant through the four-way valve 4 to heat the battery pack. When the first compressor 11 intervenes in the work, such as Figure 7As shown in (b), on the basis of a single compressor, a first compressor 11 is added to heat the battery pack. The first compressor 11 first passes the high-temperature and high-pressure gas refrigerant through the first battery plate exchanger 16 (heat release) and then to the liquid cooling condenser 15. The first battery plate exchanger 16 and the second battery plate exchanger 17 are connected in series to heat the battery pack. According to actual needs, on the basis of dual compressors, if the heating capacity is insufficient, a PTC heater 6 is added to assist in heating the battery pack. The PTC heater 6 is only used to heat the battery pack.

[0058] like Figure 8 As shown, in the passenger compartment and battery pack heating mode, that is, based on the above-mentioned single battery pack heating mode (dual compressor + PTC heater 6), the high-temperature and high-pressure gas refrigerant output by the first compressor 11 is divided into two paths, one for the first battery panel exchange 16, and the other for the passenger compartment condenser 2. The heating capacity of the two can be distributed through the electronic expansion valve on the first labyrinth valve 13.

[0059] like Fig. 9 As shown, in the passenger compartment heating and dehumidification mode, that is, a dehumidification function is added on the basis of the single passenger compartment heating mode, the high-temperature and high-pressure gas refrigerant discharged by the first compressor 11 passes through the passenger compartment condenser 2 (releases heat), and then evaporates in two ways, one way is evaporated and dehumidified in the passenger compartment evaporator 3, and the other way is evaporated in the liquid-cooled condenser 15.

[0060] like Fig.10 As shown, in the direct heat dissipation mode of the battery pack, the first compressor 11 and the second compressor 12 are not working. The first coolant pipeline and the second coolant pipeline are connected to form a loop by switching the four-way valve 4. Driven by the first liquid pump 10 and the second liquid pump 9, the coolant flows in the loop and takes away the heat in the coolant through the radiator 8. That is, the four-way valve 4 directly forms a loop and the external radiator 8 (turn on the cooling fan) to dissipate heat. In the drive system heating battery pack mode, the four-way valve 4 directly forms a loop and the external radiator 8 (turn off the cooling fan and do not pass through the radiator 8) for heating.

[0061] like Fig.11 As shown, in the drive system heat dissipation mode, the first compressor 11 and the second compressor 12 are not working. Driven by the second liquid pump 9, the coolant flows in the second coolant pipeline and takes away the heat in the coolant through the radiator 8.

[0062] In summary, the vehicle-mounted heat pump system in the embodiment of the present application has the following advantages:

[0063] 1. A dual 34cc compressor parallel connection solution can be adopted, the compressor cost is controllable, and it has been verified by a large number of passenger car markets, and the quality is stable and reliable;

[0064] 2. Dual compressor solution, the cooling capacity adjustment range is from 0.8kw to 25kw, with a wide adjustment range and strong adaptability;

[0065] 3. It can also meet the cooling and heating needs of the passenger compartment and battery pack;

[0066] 4. The application of the four-way valve 4 can utilize the radiator 8 to dissipate heat from the battery pack when the ambient temperature is low.

[0067] According to another aspect of the present application, an embodiment of the present application further provides a vehicle, which applies the on-board heat pump system in the above embodiment.

[0068] It can be understood that, since the vehicle-mounted heat pump system in the above embodiment is adopted, the advantages and benefits brought by the above vehicle-mounted heat pump system are also correspondingly possessed, which will not be elaborated here.

[0069] 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.

[0070] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A vehicle-mounted heat pump system, characterized in that: Including heat pump unit, passenger compartment condenser, passenger compartment evaporator, four-way valve, battery heat exchanger, PTC heater, drive system heat exchanger, radiator; The heat pump unit includes a first compressor, a second compressor, a first labyrinth valve, a second labyrinth valve, a liquid-cooled condenser, a first battery panel exchanger and a second battery panel exchanger; the first labyrinth valve and the second labyrinth valve are both provided with an air inlet, an air outlet and four groups of interfaces, each group of interfaces includes an outlet and an inlet, and the four groups of interfaces are respectively a first group of interfaces, a second group of interfaces, a third group of interfaces and a fourth group of interfaces; the first compressor is connected in series between the air inlet and the air outlet of the first labyrinth valve, the passenger compartment condenser is connected in series between the outlet and the inlet of the first group of interfaces of the first labyrinth valve, and the passenger compartment evaporator is connected in series between the second group of interfaces of the first labyrinth valve The refrigerant passage of the liquid-cooled condenser is connected in series between the outlet and inlet of the third group of interfaces of the first labyrinth valve, and the refrigerant passage of the first battery panel exchanger is connected in series between the outlet and inlet of the fourth group of interfaces of the first labyrinth valve; the second compressor is connected in series between the air inlet and the air outlet of the second labyrinth valve, the outlet and the inlet of the first group of interfaces of the second labyrinth valve are connected, the refrigerant passage of the liquid-cooled condenser is also connected in series between the outlet and the inlet of the third group of interfaces of the second labyrinth valve, and the refrigerant passage of the second battery panel exchanger is connected in series between the outlet and the inlet of the fourth group of interfaces of the second labyrinth valve; The PTC heater, the first liquid pump, the coolant passage of the second battery panel, the coolant passage of the first battery panel, and the battery heat exchanger are sequentially connected in series between one inlet and outlet of the four-way valve through the first coolant pipeline; the radiator, the second liquid pump, and the liquid-cooled condenser are sequentially connected in series between another inlet and outlet of the four-way valve through the second coolant pipeline, and the drive system heat exchanger is connected in parallel with the radiator through a pipeline.

2. The vehicle-mounted heat pump system according to claim 1, characterized in that: The first battery plate exchanger and the second battery plate exchanger have the same structure, both comprising a plate exchanger body and a refrigerant cavity and a cooling liquid cavity which are arranged inside the plate exchanger body and isolated from each other, the plate exchanger body is provided with a refrigerant inlet and a refrigerant outlet which are communicated with the refrigerant cavity, and the plate exchanger body is provided with a cooling liquid inlet and a cooling liquid outlet which are communicated with the cooling liquid cavity; Or, the second battery plate exchanger includes a first plate exchanger and a second plate exchanger connected to each other, the first plate exchanger has a refrigerant passage and a coolant passage isolated from each other, the refrigerant passage of the first plate exchanger is connected in series between the outlet and the inlet of the fourth group of interfaces of the second labyrinth valve; the second plate exchanger has a coolant inlet joint, a coolant outlet joint and a refrigerant passage isolated from each other, the coolant inlet joint and the coolant outlet joint are connected to the coolant passage of the first plate exchanger, the coolant passage of the first plate exchanger is connected in series to the first coolant pipeline through the coolant inlet joint and the coolant outlet joint, and the refrigerant passage of the second plate exchanger is connected in series between the outlet and the inlet of the second group of interfaces of the second labyrinth valve.

3. The vehicle-mounted heat pump system according to claim 1 or 2, characterized in that: The vehicle-mounted heat pump system has a single passenger compartment cooling mode, a single battery pack cooling mode, a passenger compartment and battery pack cooling mode, a single passenger compartment heating mode, a single battery pack heating mode, a passenger compartment and battery pack heating mode, a passenger compartment heating and dehumidification mode, a battery pack direct heat dissipation mode, a drive system heat dissipation mode, and a drive system heating battery pack mode.

4. The vehicle-mounted heat pump system according to claim 3, characterized in that: In the single passenger compartment cooling mode, the second compressor and the second labyrinth valve do not work. Under the action of the first compressor and the first labyrinth valve, the refrigerant circulates between the passenger compartment evaporator, the first compressor and the liquid-cooled condenser. Driven by the second liquid pump, the coolant in the second coolant pipeline flows and takes away the heat in the drive system heat exchanger and the liquid-cooled condenser through the radiator.

5. The vehicle-mounted heat pump system according to claim 3, characterized in that: In the single battery pack cooling mode, the PTC heater does not work. When only the first compressor works, under the action of the first compressor and the first labyrinth valve, the refrigerant circulates between the refrigerant passage of the first battery panel, the first compressor and the liquid-cooled condenser. Driven by the first liquid pump, the coolant in the first coolant pipeline flows to dissipate heat for the battery pack; driven by the second liquid pump, the coolant in the second coolant pipeline flows to take away the heat in the drive system heat exchanger and the liquid-cooled condenser through the radiator. When the second compressor is put into operation, under the action of the second compressor and the second labyrinth valve, the refrigerant circulates between the refrigerant passage of the second battery plate exchanger, the second compressor and the liquid-cooled condenser.

6. The vehicle-mounted heat pump system according to claim 5, characterized in that: In the passenger compartment and battery pack cooling mode, based on the single battery pack cooling mode, the refrigerant is divided into two paths after coming out of the liquid cooling condenser, one path enters the passenger compartment evaporator, and the other enters the refrigerant passage exchanged by the first battery panel. The cooling capacity of the two paths can be adjusted by the electronic expansion valve on the first labyrinth valve.

7. The vehicle-mounted heat pump system according to claim 3, characterized in that: In the direct heat dissipation mode of the battery pack, the first compressor and the second compressor do not work. The first coolant pipeline and the second coolant pipeline are connected to form a loop by switching the four-way valve. Driven by the first liquid pump and the second liquid pump, the coolant flows in the loop and takes away the heat in the coolant through the radiator.

8. The vehicle-mounted heat pump system according to claim 3, characterized in that: In the heat dissipation mode of the drive system, both the first compressor and the second compressor do not work, and the coolant flows in the second coolant pipeline under the drive of the second liquid pump, and takes away the heat in the coolant through the radiator.

9. A vehicle, characterized in that: It comprises the vehicle-mounted heat pump system as described in any one of claims 1 to 8.

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