Heat pump system for a vehicle

Abstract

The present invention discloses a heat pump system for a vehicle, which controls the temperature of a battery module through a refrigerator that exchanges heat between a refrigerant and a coolant, and recovers waste heat generated from electrical components and the battery module to use the waste heat for indoor heating, thereby improving heating performance and efficiency. Moreover, the heat pump system maximizes heating performance by applying a gas injection unit that selectively operates in the heating mode of the vehicle to increase the refrigerant flow rate.

Description

[0001] Cross - reference to related applications

[0002] This application claims the priority and benefit of a Korean patent application No. 10 - 2020 - 0123942, filed with the Korean Intellectual Property Office on September 24, 2020, the entire content of which is incorporated herein by reference. Technical field

[0003] The present disclosure relates to a heat pump system for a vehicle. More specifically, the present disclosure relates to a heat pump system for a vehicle that can control the temperature of a battery module and an autonomous driving controller using a chiller that exchanges heat between a refrigerant and a coolant, and can utilize waste heat generated from electrical components, the battery module, and the autonomous driving controller to improve heating performance and efficiency. Background art

[0004] Generally, an air - conditioning system for a vehicle includes an air - conditioning device that circulates a refrigerant to heat or cool the vehicle interior.

[0005] Such an air - conditioning device maintains a comfortable interior environment by keeping the vehicle interior temperature at an appropriate temperature regardless of outdoor temperature changes, and is configured to heat or cool the vehicle interior through heat exchange in a condenser and an evaporator during the process in which the refrigerant discharged by driving a compressor passes through a condenser, a liquid receiver drier, an expansion valve, and an evaporator and then circulates back to the compressor again.

[0006] That is, in the air - conditioning device, in the cooling mode in summer, the high - temperature and high - pressure gaseous refrigerant compressed by the compressor is condensed by the condenser, and then passes through the liquid receiver drier and the expansion valve and is evaporated by the evaporator to lower the temperature and humidity of the interior.

[0007] Recently, as concerns about energy efficiency and environmental pollution have gradually increased, there is a need to develop eco - friendly vehicles that can substantially replace vehicles with internal combustion engines, and eco - friendly vehicles are generally classified into electric vehicles that use fuel cells or electricity as a power source to drive and hybrid vehicles that use an engine and a battery to drive.

[0008] In electric vehicles and hybrid vehicles of eco - friendly vehicles, different from the air - conditioning devices of ordinary vehicles, a separate heater is not used, and the air - conditioning device applied to eco - friendly vehicles is generally called a heat pump system.

[0009] In the case of an electric vehicle using a fuel cell, driving force is generated by converting the chemical reaction energy of oxygen and hydrogen into electrical energy, and in this process, heat is generated through the chemical reaction in the fuel cell. Therefore, it is necessary to effectively eliminate the generated heat to ensure the performance of the fuel cell.

[0010] Even in a hybrid vehicle, a motor is driven by using electric power supplied from a fuel cell or a battery and an engine actuated by ordinary fuel to generate a driving force. Therefore, only by effectively removing the heat generated from the fuel cell or the battery and the motor can the performance of the motor be ensured.

[0011] Therefore, in a hybrid vehicle or an electric vehicle of the prior art, a battery cooling system, a cooling device, and a heat pump system should be configured to have respective separate circuits to prevent heat generation of the motor, electrical components, and a battery including a fuel cell.

[0012] Therefore, the size and weight of a cooling module provided at the front of the vehicle are increased, and the layout of connection pipes for supplying a refrigerant or a coolant to the heat pump system, the cooling device, and the battery cooling system inside the engine room becomes complicated.

[0013] In addition, since a battery cooling system for heating or cooling a battery is separately provided according to the state of the vehicle so that the battery can operate in an optimal state, a plurality of valves for connecting to respective connection pipes are applied. Thus, noise and vibration generated by frequent opening and closing operations of these valves are transmitted into the vehicle interior, thereby reducing riding comfort.

[0014] In addition, when heating the interior of the vehicle, heating performance deteriorates due to a lack of a heat source, power consumption increases due to the use of an electric heater, and power consumption of a compressor increases.

[0015] The above information disclosed in this background art section is only for enhancing the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those skilled in the art in this country. SUMMARY OF THE INVENTION

[0016] Therefore, the present disclosure is made to provide a heat pump system for a vehicle, which can control the temperature of a battery module and the temperature of an autonomous driving controller by using a single refrigerating machine that exchanges heat between a refrigerant and a coolant, and can improve heating performance and efficiency by recovering waste heat generated from electrical components, the battery module, and the autonomous driving controller and using the waste heat for interior heating.

[0017] In addition, the present disclosure is made to provide a heat pump system for a vehicle, which can maximize heating performance by applying a gas injection unit that selectively operates in a heating mode of the vehicle to increase the flow rate of the refrigerant.

[0018] Embodiments of the present disclosure provide a heat pump system for a vehicle, including: a first cooling device, including a first radiator, a first water pump, and a first valve connected by a first coolant pipeline, and circulating a first coolant in the first coolant pipeline to cool at least one electrical component disposed in the first coolant pipeline; a second cooling device, including a second radiator, a second water pump, a battery module, an autonomous driving controller, and a second valve connected by a second coolant pipeline, and circulating a second coolant to the battery module and the autonomous driving controller; a refrigerator, a first branch pipeline of the first coolant pipeline connected through the first valve and a second branch pipeline of the second coolant pipeline connected through the second valve respectively pass through the refrigerator, the refrigerator is connected to a refrigerant pipeline of an air conditioning device through a refrigerant connection pipeline, and the refrigerator controls the temperature of the coolant by exchanging heat between the coolant selectively flowing in through the first branch pipeline or the second branch pipeline and the refrigerant selectively supplied from the air conditioning device; and a gas injection part, disposed in the air conditioning device, and increasing the flow rate of the refrigerant circulating in the refrigerant pipeline by bypassing a part of the refrigerant in the refrigerant passing through the internal condenser to the compressor.

[0019] One end of the first branch pipeline can be connected to the first coolant pipeline through the first valve, and the other end of the first branch pipeline is connected to the first coolant pipeline connected to the electrical component; and one end of the second branch pipeline can be connected to the second coolant pipeline through the second valve, the second valve is disposed in the second coolant pipeline between the second radiator and the second water pump, and the other end of the second branch pipeline is connected to the second coolant pipeline between the autonomous driving controller and the second radiator.

[0020] The air conditioning device may include: an HVAC module, including: an evaporator connected by a refrigerant pipeline; and an opening and closing door, the opening and closing door controls the selective inflow of external air passing through the evaporator into the internal condenser according to the cooling, heating, and dehumidifying modes of the vehicle; a heat exchanger, exchanging heat between the refrigerant supplied through the refrigerant pipeline and the external air; a compressor, connected between the evaporator and the internal condenser by the refrigerant pipeline; a first expansion valve, disposed in the refrigerant pipeline between the heat exchanger and the evaporator; a second expansion valve, disposed in the refrigerant connection pipeline; and a liquid receiver, disposed in the refrigerant pipeline between the evaporator and the compressor and connected to the refrigerant connection pipeline.

[0021] When cooling the battery module by using the coolant that exchanges heat with the refrigerant, the second expansion valve can expand the refrigerant flowing in through the refrigerant connection pipeline and flow it into the refrigerator.

[0022] The gas injection unit may include: a gas-liquid separator disposed in a refrigerant pipeline between the internal condenser and the heat exchanger, and separating and selectively discharging gaseous refrigerant and liquid refrigerant in the refrigerant passing through the internal condenser; a bypass pipeline connecting the gas-liquid separator and the compressor, and selectively supplying the gaseous refrigerant from the gas-liquid separator to the compressor; a bypass valve disposed in the bypass pipeline; a third expansion valve disposed in the refrigerant pipeline between the internal condenser and the gas-liquid separator; and a fourth expansion valve disposed in the refrigerant pipeline between the gas-liquid separator and the heat exchanger.

[0023] When the gas injection unit operates in the heating mode of the vehicle, the third expansion valve may expand the refrigerant supplied from the internal condenser and supply it to the gas-liquid separator, and the fourth expansion valve may expand the refrigerant supplied from the gas-liquid separator and flow through the refrigerant pipeline.

[0024] When the gas injection unit does not operate in the heating mode of the vehicle, the third expansion valve may allow the refrigerant supplied from the internal condenser to pass through, and the fourth expansion valve may expand the refrigerant passing through the gas-liquid separator and supply it to the heat exchanger.

[0025] In the cooling mode or dehumidifying mode of the vehicle, the third expansion valve and the fourth expansion valve may allow the refrigerant supplied from the internal condenser to flow through the refrigerant pipeline without expanding the refrigerant.

[0026] When the gas injection unit operates, the bypass valve may operate to open the bypass pipeline.

[0027] The first expansion valve, the second expansion valve, the third expansion valve, and the fourth expansion valve may be electronic expansion valves that selectively expand the refrigerant while controlling the flow of the refrigerant.

[0028] According to the selective operation of the fourth expansion valve, the heat exchanger may condense or evaporate the refrigerant condensed in the internal condenser through heat exchange with the external air.

[0029] The air conditioning device may further include a refrigerant branch pipeline, and the refrigerant branch pipeline is connected to the refrigerant pipeline between the heat exchanger and the first expansion valve through a refrigerant valve, and the refrigerant valve is disposed in the refrigerant pipeline between the heat exchanger and the gas injection unit.

[0030] When external heat is not recovered in the dehumidifying mode or heating mode of the vehicle, the refrigerant valve may open the refrigerant branch pipeline and may close the part of the refrigerant pipeline connected to the heat exchanger.

[0031] The first valve, the second valve, and the refrigerant valve may be three-way valves.

[0032] When the gas injection unit operates while recovering waste heat from an electrical component in the heating mode of the vehicle, the first branch pipeline can be opened in a state where the first coolant pipeline connected to the electrical component is opened by the operation of the first valve and the first coolant pipeline connected to the first radiator is closed by the operation of the first valve; in the first cooling device, through the operation of the first water pump, the first coolant passing through the electrical component can be supplied to the refrigerator through the opened first branch pipeline without passing through the first radiator; the second cooling device can stop operating; in the air conditioning device, the refrigerant pipeline connected to the evaporator can be closed by the first expansion valve; the refrigerant connection pipeline can be opened by the second expansion valve; the second expansion valve can expand the refrigerant supplied to the refrigerant connection pipeline and supply it to the refrigerator; in the gas injection unit, the bypass pipeline can be opened by the bypass valve, the third expansion valve can expand the refrigerant and supply it to the gas-liquid separator, and the fourth expansion valve can expand the refrigerant passing through the gas-liquid separator; and the refrigerant valve can open the refrigerant branch pipeline so that the refrigerant expanded while passing through the fourth expansion valve is not supplied to the heat exchanger.

[0033] In the dehumidification mode of the vehicle, the first cooling device and the second cooling device can stop operating; in the air conditioning device, the refrigerant pipeline connected to the evaporator can be opened by the first expansion valve; the refrigerant connection pipeline can be closed by the second expansion valve; and the refrigerant valve can open the refrigerant branch pipeline so that the refrigerant supplied from the internal condenser is not supplied to the heat exchanger.

[0034] When cooling the battery module and the autonomous driving controller in the cooling mode of the vehicle, the second branch pipeline can be opened by the second valve, and based on the second branch pipeline, the second coolant pipeline connected to the second radiator can be closed; in the second cooling device, the second coolant can circulate in the opened second branch pipeline and the opened second coolant pipeline through the second water pump, and the coolant that has passed through the refrigerator can be supplied to the battery module and the autonomous driving controller; in the air conditioning device, in a state where the refrigerant connection pipeline is opened by the second expansion valve, the refrigerant can circulate along the refrigerant pipeline and the refrigerant connection pipeline; and the first expansion valve and the second expansion valve can expand the refrigerant so that the expanded refrigerant is supplied to the evaporator and the refrigerator respectively.

[0035] When recovering waste heat from an external heat source, electrical components, a battery module, and an autonomous driving controller in the heating mode of a vehicle, the first branch pipeline can be opened in a state where the first coolant pipeline connected to the electrical components is opened by a first valve and the first coolant pipeline connected to the first radiator is closed by the first valve; in the first cooling device, the first coolant passing through the electrical components by the operation of the first water pump can be supplied to the refrigerator through the opened first branch pipeline without passing through the first radiator; in a state where the second branch pipeline is opened by a second valve, the second coolant pipeline connected to the second radiator can be closed based on the second branch pipeline; in the second cooling device, the second coolant passing through the battery module and the autonomous driving controller by the second water pump can be supplied to the refrigerator through the second branch pipeline; in the air conditioning device, the refrigerant pipeline connecting the heat exchanger and the evaporator can be closed by a first expansion valve; the refrigerant connection pipeline can be opened by a second expansion valve; and the second expansion valve can expand the refrigerant supplied to the refrigerant connection pipeline and supply it to the refrigerator.

[0036] The heat exchanger can be an air-cooled heat exchanger.

[0037] When cooling the electrical components, the battery module, and the autonomous driving controller, the first branch pipeline can be closed by the first valve; the second branch pipeline can be closed by the second valve; the first coolant cooled by the first radiator can be supplied to the electrical components along the first coolant pipeline by the operation of the first water pump; and the second coolant cooled by the second radiator can be supplied to the battery module and the autonomous driving controller along the second coolant pipeline by the operation of the second water pump.

[0038] The electrical components can include a power control device, an inverter, an on-board charger (OBC), or a power converter.

[0039] As described above, for the heat pump system for a vehicle according to an embodiment of the present disclosure, by using a single refrigerator that exchanges heat between a refrigerant and a coolant to control the temperature of the battery module and the temperature of the autonomous driving controller, simplification of the system can be achieved.

[0040] In addition, according to an embodiment of the present disclosure, the battery module can be made to operate in an optimal performance state by effectively controlling the temperature of the battery module, and the total mileage of the vehicle can be increased through effective management of the battery module.

[0041] In addition, according to an embodiment of the present disclosure, the heating efficiency can be improved by selectively using the waste heat of an external heat source or electrical components, the battery module, or the autonomous driving controller in the heating mode of the vehicle.

[0042] In addition, according to an embodiment of the present disclosure, the heating performance can be maximized by applying a gas injection unit to selectively increase the flow rate of the refrigerant in the heating mode of the vehicle.

[0043] Furthermore, according to an embodiment of the present disclosure, the manufacturing cost and weight can be reduced by simplifying the entire system, and the space utilization rate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A block diagram showing a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0045] Figure 2 An operating state diagram showing the operation of cooling electrical components, a battery module, and an autonomous driving controller by using a coolant in a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0046] Figure 3 An operating state diagram showing the operation of cooling a battery module and an autonomous driving controller by using a refrigerant in a heat pump system for a vehicle according to an embodiment of the present disclosure in a cooling mode.

[0047] Figure 4 An operating state diagram showing the recovery of waste heat from an external heat source, electrical components, a battery module, and an autonomous driving controller according to a heating mode in a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0048] Figure 5 An operating state diagram showing the recovery of waste heat from an external heat source, electrical components, a battery module, and an autonomous driving controller and the operation of a gas injection unit according to a heating mode in a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0049] Figure 6 An operating state diagram showing the recovery of waste heat from electrical components and the operation of a gas injection unit according to a heating mode in a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0050] Figure 7 An operating state diagram showing a dehumidification mode in a heat pump system for a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0051] Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0052] Since the embodiments described in the specification and the configurations shown in the drawings are only the most preferred embodiments and configurations of the present disclosure, they do not represent all the technical ideas of the present disclosure, and it should be understood that various equivalent forms and modification examples of the embodiments are possible when this application is filed.

[0053] To clearly describe the present disclosure, parts irrelevant to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

[0054] Since the dimensions and thicknesses of each configuration shown in the drawings are arbitrarily shown for convenience of description, the present disclosure is not necessarily limited to the configurations shown in the drawings, and an increased thickness is shown to clearly show several parts and regions.

[0055] In addition, throughout the specification, unless there is a clear contrary description, the word "comprising" and variations such as "comprises" or "comprising" will be understood to imply the inclusion of the stated elements but not the exclusion of any other elements.

[0056] In addition, terms such as "…… unit", "…… device", "…… part", and "…… component" described in the specification refer to a unit having an integrated configuration with at least one function or operation.

[0057] Figure 1 A block diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure is shown.

[0058] The heat pump system for a vehicle according to an embodiment of the present disclosure can adjust the temperature of the battery module 25 through a chiller 30 that exchanges heat using a refrigerant and a coolant, and can utilize the waste heat of an external heat source or electrical components 15, the battery module 25, or the autonomous driving controller 26, as well as a gas injection unit 70 to improve the heating performance and efficiency.

[0059] Here, in the heat pump system of an electric vehicle, a first cooling device 10 for cooling the electrical components 15, a second cooling device 20 for cooling the battery module 25 and the autonomous driving controller 26, and an air conditioning device 50 as an air conditioning device for cooling and heating the interior can be interlocked with each other.

[0060] That is, referring to Figure 1 , the heat pump system may include a first cooling device 10, a second cooling device 20, a chiller 30, and an air conditioning device 50.

[0061] First, the first cooling device 10 includes a first radiator 12, a first water pump 14, a first valve V1, and a first liquid storage tank 17 connected through a first coolant pipeline 11.

[0062] The first radiator 12 is disposed at the front of the vehicle, a cooling fan 13 is disposed at the rear of the first radiator 12, and the coolant is cooled by exchanging heat with external air through the operation of the cooling fan 13.

[0063] In addition, the electrical component 15 may include a power conversion device such as an electric power control unit (EPCU), a motor, an inverter, or an on-vehicle charger (OBC).

[0064] During driving, the electric power control unit, the inverter, or the motor generates heat, and when the battery module 25 is charged, the charger may generate heat.

[0065] The electrical component 15 configured as described above may be disposed in the first coolant line 11 to be cooled by water cooling.

[0066] That is, when recovering the waste heat of the electrical component 15 in the heating mode of the vehicle, the heat generated from a power conversion device such as an EPCU, a motor, an inverter, or an OBC may be recovered.

[0067] Meanwhile, the first reservoir 17 is disposed in the first coolant line 11 between the first radiator 12 and the first valve V1. The coolant cooled by the first radiator 12 may be stored in the first reservoir 17.

[0068] The first cooling device 10 configured as described above may circulate the coolant in the first coolant line 11 such that the coolant is supplied to the electrical component 15 disposed in the first coolant line 11.

[0069] That is, the first cooling device 10 circulates the coolant cooled by the first radiator 12 along the first coolant line 11 by the operation of the first water pump 14, thereby cooling the electrical component 15 to prevent overheating.

[0070] In the present embodiment, the second cooling device 20 may include a second radiator 22, a second water pump 24, a battery module 25, an autonomous driving controller 26, and a second valve V2 connected through a second coolant line 21.

[0071] The second cooling device 20 may selectively supply the coolant cooled by the second radiator 22 to the battery module 25 and the autonomous driving controller 26.

[0072] Here, the second radiator 22 and the first radiator 12 are disposed on the same line, and the coolant is cooled by exchanging heat with the external air through the operation of the cooling fan 13.

[0073] Meanwhile, in the present embodiment, it is described that the second radiator 22 and the first radiator 12 are disposed on the same line, but the present disclosure is not limited thereto, and the first radiator 12 and the second radiator 22 may be integrally constructed.

[0074] In addition, the second reservoir 27 is disposed in the second coolant line 21 between the second radiator 22 and the second water pump 24. The coolant cooled by the second radiator 22 may be stored in the second reservoir 27.

[0075] The second cooling device 20 configured as described above can selectively circulate the coolant to the battery module 25 and the autonomous driving controller 26 by the operation of the second water pump 24.

[0076] Here, the battery module 25 and the autonomous driving controller 26 supply power to the electrical components 15 and are configured as water-cooled types that are cooled by the coolant flowing along the second coolant pipeline 21.

[0077] Here, the first water pump 14 and the second water pump 24 can be electric water pumps.

[0078] In this embodiment, the first branch pipeline 18 connected to the first coolant pipeline 11 through the first valve V1 and the second branch pipeline 28 connected to the second coolant pipeline 21 through the second valve V2 respectively pass through the refrigerator 30, and the coolant can selectively circulate in the first branch pipeline and the second branch pipeline.

[0079] The refrigerator 30 is connected to the refrigerant pipeline 51 of the air conditioning device 50 through the refrigerant connection pipeline 61. That is, the refrigerator 30 can be a water-cooled heat exchanger into which the coolant flows.

[0080] Therefore, the refrigerator 30 exchanges heat between the coolant selectively flowing in through the first branch pipeline 18 or the second branch pipeline 28 and the refrigerant selectively supplied from the air conditioning device 50 to control the temperature of the coolant.

[0081] Here, one end of the first branch pipeline 18 is connected to the first coolant pipeline 11 through the first valve Vl. In addition, the other end of the first branch pipeline 18 can be connected to the first coolant pipeline 11 connected to the electrical components 15 or the first radiator 12.

[0082] When recovering the waste heat from the electrical components 15, the first branch pipeline 18 can be selectively opened by the operation of the first valve V1, so that the coolant passing through the electrical components 15 is supplied to the electrical components 15 again without passing through the first radiator 12.

[0083] In addition, one end of the second branch pipeline 28 is connected to the second coolant pipeline 21 through the second valve V2 provided in the second coolant pipeline 21 between the second radiator 22 and the second water pump 24.

[0084] The other end of the second branch pipeline 28 can be connected to the second coolant pipeline 21 between the autonomous driving controller 26 and the second radiator 22.

[0085] When recovering the waste heat of the battery module 25 and the autonomous driving controller 26, or when raising the temperatures of the battery module 25 and the autonomous driving controller 26, the second branch pipeline 28 can be selectively opened and closed by the operation of the second valve V2, so that the coolant passing through the battery module 25 and the autonomous driving controller 26 is supplied to the battery module 25 and the autonomous driving controller 26 again without passing through the second radiator 22.

[0086] Here, the first valve V1 and the second valve V2 control the flow of the coolant in the first cooling device 10 and the second cooling device 20 by controlling the opening and closing of the first branch pipeline 18 and the second branch pipeline 28.

[0087] That is, when cooling the electrical component 15 by using the coolant cooled by the first radiator 12, the first valve V1 can open the first coolant pipeline 11 connected to the first radiator 12 and close the first branch pipeline 18.

[0088] Then, while the coolant cooled by the first radiator 12 circulates along the first coolant pipeline 11 connected by the operation of the first valve V1, the coolant can cool the electrical component 15.

[0089] On the contrary, when recovering the waste heat from the electrical component 15, the first valve V1 can close the first coolant pipeline 11 connected to the first radiator 12 and open the first branch pipeline 18.

[0090] Then, the coolant circulating in the first cooling device 10 passes through the electrical component 15 along the opened first coolant pipeline 11 and the first branch pipeline 18 without passing through the first radiator 12, so that the temperature of the coolant can rise.

[0091] In addition, when cooling the battery module 25 and the autonomous driving controller 26 by using the coolant cooled by the second radiator 22, the second valve V2 can close the second branch pipeline 28.

[0092] Then, while the coolant cooled by the second radiator 22 flows along the second coolant pipeline 21 connected by the operation of the second valve V2, the coolant can cool the battery module 25 and the autonomous driving controller 26.

[0093] Meanwhile, when cooling the battery module 25 and the autonomous driving controller 26 by using the coolant that exchanges heat with the refrigerant in the refrigerator 30, and when recovering the waste heat from the battery module 25 and the autonomous driving controller 26, the second valve V2 can open the second branch pipeline 28 and close the second coolant pipeline 21 connected to the second radiator 22.

[0094] Therefore, the low-temperature coolant that has completed heat exchange with the refrigerant in the refrigerator 30 flows into the battery module 25 and the autonomous driving controller 26 through the second branch pipeline 28 opened by the second valve V2, so that the battery module 25 and the autonomous driving controller 26 can be effectively cooled.

[0095] On the other hand, when recovering waste heat from the battery module 25 and the autonomous driving controller 26, the operation of the second valve V2 prevents the coolant circulating along the second coolant pipeline 21 from flowing into the second radiator 22, so that waste heat can be recovered from the battery module 25 and the autonomous driving controller 26.

[0096] In this embodiment, the air conditioning device 50 includes an HVAC (heating, ventilation, and air conditioning) module 52, a heat exchanger 53, a first expansion valve 55, an evaporator 56, a liquid reservoir 57, a compressor 59, and a second expansion valve 63 connected by a refrigerant pipeline 51.

[0097] First, the HVAC module 52 includes an evaporator 56 connected by a refrigerant pipeline 51 and an opening / closing door 52b for controlling the selective inflow of outside air passing through the evaporator 56 into the internal condenser 52a according to the cooling, heating, and heating / dehumidifying modes of the vehicle.

[0098] That is, in the heating mode of the vehicle, the opening / closing door 52b is opened so that the outside air passing through the evaporator 56 flows into the internal condenser 52a. On the contrary, in the cooling mode of the vehicle, the opening / closing door 52b closes the internal condenser 52a side so that the outside air cooled when passing through the evaporator 56 directly flows into the vehicle interior.

[0099] In this embodiment, the heat exchanger 53 is connected to the refrigerant pipeline 51 so that the refrigerant passes through it. The heat exchanger 53 can exchange heat between the refrigerant supplied through the refrigerant pipeline 51 and the outside air.

[0100] That is, the heat exchanger 53 is arranged in front of the first radiator 12 and the second radiator 22 to exchange heat between the refrigerant that has flowed into the heat exchanger 53 and the outside air. The heat exchanger 53 can be an air-cooled heat exchanger that condenses or evaporates the refrigerant by using the outside air.

[0101] The first expansion valve 55 is arranged in the refrigerant pipeline 51 between the heat exchanger 53 and the evaporator 56. The first expansion valve 55 receives the refrigerant passing through the heat exchanger 53 to expand the refrigerant.

[0102] The liquid reservoir 57 is arranged in the refrigerant pipeline 51 between the evaporator 56 and the compressor 59 and is connected to the refrigerant connection pipeline 61.

[0103] The accumulator 57 improves the efficiency and durability of the compressor 59 by supplying only gaseous refrigerant to the compressor 59.

[0104] In this embodiment, one end of the refrigerant connection pipeline 61 is connected to the refrigerant pipeline 51 between the heat exchanger 53 and the first expansion valve 55. Additionally, the other end of the refrigerant connection pipeline 61 can be connected to the accumulator 57.

[0105] Here, the accumulator 57 can supply the gaseous refrigerant in the refrigerant supplied through the refrigerant connection pipeline 61 to the compressor 59.

[0106] Meanwhile, the second expansion valve 63 can be provided in the refrigerant connection pipeline 61.

[0107] When cooling the battery module 25 and the autonomous driving controller 26 by using a coolant that exchanges heat with the refrigerant, the second expansion valve 63 can expand the refrigerant flowing into the refrigerant connection pipeline 61 and make it flow into the chiller 30.

[0108] Here, even when recovering the waste heat of the electrical component 15 or the waste heat of the battery module 25 and the autonomous driving controller 26 in the heating mode of the vehicle, the second expansion valve 63 can still operate.

[0109] The second expansion valve 63 can selectively expand the refrigerant flowing into the refrigerant connection pipeline 61 and make it flow into the chiller 30.

[0110] That is, the second expansion valve 63 expands the refrigerant discharged from the heat exchanger 53, makes the refrigerant flow into the chiller 30 in a state of reduced temperature, thereby further reducing the temperature of the coolant passing through the inside of the chiller 30.

[0111] Therefore, the coolant whose temperature has decreased when passing through the chiller 30 can flow into the battery module 25 and the autonomous driving controller 36 for more effective cooling.

[0112] The compressor 59 is connected between the evaporator 56 and the heat exchanger 53 through the refrigerant pipeline 51. The compressor 59 can compress the gaseous refrigerant and supply the compressed refrigerant to the heat exchanger 53.

[0113] Meanwhile, in this embodiment, the heat pump system can further include a gas injection part 70.

[0114] The gas injection part 70 is provided in the air conditioning device 50. The gas injection part 70 can bypass a part of the refrigerant in the refrigerant passing through the internal condenser 52a to the compressor 59 to increase the flow rate of the refrigerant circulating in the refrigerant pipeline 51.

[0115] The gas injection unit 70 configured as described above can be selectively operated in the heating mode of the vehicle.

[0116] Conversely, the gas injection unit 70 can stop operating in the cooling mode or dehumidifying mode of the vehicle.

[0117] Here, the gas injection unit 70 includes a gas-liquid separator 71, a bypass line 72, a bypass valve 73, a third expansion valve 74, and a fourth expansion valve 75.

[0118] First, the gas-liquid separator 71 is disposed in the refrigerant line 51 between the internal condenser 52a and the heat exchanger 53.

[0119] The gas-liquid separator 71 can separate the gaseous refrigerant and the liquid refrigerant in the refrigerant that has undergone complete heat exchange when passing through the internal condenser 52a and selectively discharge them.

[0120] The bypass line 72 connects the gas-liquid separator 71 and the compressor 59. The bypass line 72 can selectively supply the gaseous refrigerant from the gas-liquid separator 71 to the compressor 59.

[0121] That is, the bypass line 72 can connect the gas-liquid separator 71 and the compressor 59 so that the gaseous refrigerant passing through the gas-liquid separator 71 can selectively flow into the compressor 59.

[0122] In this embodiment, a bypass valve 73 is provided in the bypass line 72. The bypass valve 73 can selectively open the bypass line 72 according to the vehicle mode.

[0123] Here, the gas-liquid separator 71 can supply the gaseous refrigerant to the compressor 59 through the bypass line 72 opened by the operation of the bypass valve 73. In addition, the gas-liquid separator 71 can supply the liquid refrigerant to the heat exchanger 53.

[0124] The third expansion valve 74 is disposed in the refrigerant line 51 between the internal condenser 52a and the gas-liquid separator 71.

[0125] In addition, the fourth expansion valve 75 can be disposed in the refrigerant line 51 between the gas-liquid separator 71 and the heat exchanger 53.

[0126] That is, when the gas injection unit 70 operates in the heating mode of the vehicle, the third expansion valve 74 can expand the refrigerant supplied from the internal condenser 52a and supply it to the gas-liquid separator 71.

[0127] In addition, the fourth expansion valve 75 can expand the refrigerant supplied from the gas-liquid separator 71 and flow through the refrigerant line 51.

[0128] Conversely, when the gas injection unit 70 is not operating in the heating mode of the vehicle, the third expansion valve 74 can allow the refrigerant supplied from the internal condenser 52a to pass through.

[0129] In addition, the fourth expansion valve 75 can expand the refrigerant that has passed through the gas-liquid separator 71 and supply it to the heat exchanger 53.

[0130] In addition, in the cooling mode or dehumidifying mode of the vehicle, the third expansion valve 74 and the fourth expansion valve 75 can allow the refrigerant supplied from the internal condenser 52a to flow through the refrigerant pipeline 51 without expanding the refrigerant.

[0131] Here, according to the selective operation of the fourth expansion valve 75, the heat exchanger 53 can additionally condense or evaporate the refrigerant discharged from the gas-liquid separator 71 through heat exchange with the outside air.

[0132] When the heat exchanger 53 condenses the refrigerant, the heat exchanger 53 further condenses the refrigerant condensed in the internal condenser 52a, thereby increasing the sub-cooling of the refrigerant, and thus improving the Coefficient Of Performance (COP), which is the coefficient of cooling capacity relative to the required power of the compressor.

[0133] Meanwhile, the gas injection unit 70 can further include a separate connection pipeline (not shown), one end of which is connected to the refrigerant pipeline 51 between the internal condenser 52a and the third expansion valve 74, and the other end is connected to the refrigerant pipeline 51 connected to the heat exchanger 53.

[0134] A separate on-off valve (not shown) can be provided in the separate connection pipeline (not shown). That is, in the cooling mode of the vehicle, the connection pipeline (not shown) can be opened by the operation of the on-off valve, and in this case, the refrigerant that has passed through the internal condenser 52a can be directly supplied to the heat exchange unit 53 without passing through the gas injection unit 70.

[0135] Therefore, the cooling performance can be improved by reducing the pressure of the refrigerant circulating along the refrigerant pipeline 51 in the cooling mode of the vehicle.

[0136] The air conditioning device 50 configured as described above can further include a refrigerant branch pipeline 65, which connects the refrigerant pipeline 51 between the heat exchanger 53 and the first expansion valve 55 through a refrigerant valve 64 provided in the refrigerant pipeline 51 between the heat exchanger 53 and the gas injection unit 70.

[0137] One end of the refrigerant branch pipeline 65 is connected to the refrigerant valve 64. The other end of the refrigerant branch pipeline 65 can be connected to the refrigerant pipeline 51 between the heat exchanger 53 and the first expansion valve 55.

[0138] Here, when external heat is not recovered in the dehumidification mode or heating mode of the vehicle, the refrigerant valve 64 can open the refrigerant branch pipeline 65 and close the part of the refrigerant pipeline 51 connected to the heat exchanger 53.

[0139] In this embodiment, the first expansion valve 55, the second expansion valve 63, the third expansion valve 74, and the fourth expansion valve 75 can be electronic expansion valves, which selectively expand the refrigerant while controlling the flow of the refrigerant through the refrigerant pipeline 51 or the refrigerant connection pipeline 61.

[0140] In addition, the first valve V1, the second valve V2, and the refrigerant valve 64 can be three-way valves with adjustable flow rates.

[0141] Hereinafter, reference will be made to Figures 2 to 7 The operation and function of the heat pump system for a vehicle according to an embodiment of the present disclosure configured as described above will be described in detail.

[0142] First, reference will be made to Figure 2 The operation of cooling the electrical components 15, the battery module 25, and the autonomous driving controller 26 by using a coolant in the heat pump system for a vehicle according to an embodiment of the present disclosure will be described.

[0143] Figure 2 A diagram showing the operation state of cooling the electrical components, the battery module, and the autonomous driving controller by using a coolant in the heat pump system of a vehicle according to an embodiment of the present disclosure.

[0144] Referring to Figure 2 , the first branch pipeline 18 is closed by the operation of the first valve V1. The second branch pipeline 28 is closed by the operation of the second valve V2.

[0145] In this state, in the first cooling device 10, the first water pump 14 operates to cool the electrical components 15. Therefore, the coolant cooled by the first radiator 12 and stored in the first liquid storage tank 17 is supplied to the electrical components 15.

[0146] Therefore, the electrical components 15 can be effectively cooled.

[0147] In the second cooling device 20, the second water pump 24 operates to cool the battery module 25 and the autonomous driving controller 26.

[0148] Then, while the coolant that has been cooled by the second radiator 22 and stored in the second liquid storage tank 27 circulates along the second coolant pipeline 21 by the operation of the second water pump 24, it is supplied to the battery module 25 and the autonomous driving controller 26.

[0149] The coolant that has cooled the battery module 25 and the autonomous driving controller 26 flows into the second radiator 22 along the second coolant pipeline 21.

[0150] That is, since the low-temperature coolant cooled by the second radiator 22 only cools the battery module 25 and the autonomous driving controller 26, the battery module 25 and the autonomous driving controller 26 can be effectively cooled.

[0151] As described above, while the coolant that has been cooled by the first radiator 12 and the second radiator 22 and stored in the first liquid storage tank 17 and the second liquid storage tank 27 circulates in the first coolant pipeline 11 and the second coolant pipeline 21 respectively by the operation of the first water pump 14 and the second water pump 24, it cools the electrical component 15, the battery module 25, and the autonomous driving controller 26 respectively. Therefore, the electrical component 15, the battery module 25, and the autonomous driving controller 26 can be effectively cooled.

[0152] The air conditioning device 50 and the gas injection unit 70 do not operate.

[0153] Meanwhile, in this embodiment, the electrical component 15, the battery module 25, and the autonomous driving controller 26 are all cooled by the coolant cooled by the first radiator 12 and the second radiator 22 respectively. However, the present disclosure is not limited thereto. When one of the electrical component 15, the battery module 25, and the autonomous driving controller 26 is cooled separately, the first water pump 14 and the second water pump 24 can be selectively operated.

[0154] Reference will be made to Figure 3 Describe the operation of cooling the battery module 25 and the autonomous driving controller 26 in the cooling mode of the vehicle.

[0155] Figure 3 The operation state diagram shows the operation of cooling the battery module and the autonomous driving controller by using a refrigerant in the cooling mode in a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0156] Reference Figure 3 The first cooling device 10 stops operating.

[0157] The second branch pipeline 28 is opened by the operation of the second valve V2. Therefore, based on the second branch pipeline 28, the second coolant pipeline 21 connected to the second radiator 22 is closed.

[0158] Therefore, in the second cooling device 20, the coolant that has passed through the refrigerator 30 is supplied to the battery module 25 and the autonomous driving controller 25 along the open second branch pipeline 28 and the open second coolant pipeline 21 by the operation of the second water pump 24.

[0159] The coolant that has passed through the battery module 25 and the autonomous driving controller 26 flows into the refrigerator 30. The coolant that has passed through the refrigerator 30 can be supplied to the battery module 25 and the autonomous driving controller 26 while circulating along the open second coolant pipeline 21 and the second branch pipeline 28 without passing through the radiator 22.

[0160] In the air conditioning device 50, each component operates to cool the interior of the vehicle. Therefore, the refrigerant circulates along the refrigerant pipeline 51.

[0161] Here, the refrigerant pipeline 51 connecting the heat exchanger 53 and the evaporator 56 is opened by the operation of the first expansion valve 55. The refrigerant connection pipeline 61 is opened by the operation of the second expansion valve 63.

[0162] Then, the refrigerant that has passed through the heat exchanger 53 can circulate along the refrigerant pipeline 51 and the refrigerant connection pipeline 61.

[0163] Here, the first expansion valve 55 and the second expansion valve 63 can expand the refrigerant so that the expanded refrigerant can be supplied to the evaporator 56 and the refrigerator 30 respectively.

[0164] At the same time, the coolant that has passed through the refrigerator 30 circulates in the second coolant pipeline 21 and the second branch pipeline 28 by the operation of the second water pump 24 without passing through the second radiator 22 to cool the battery module 25 and the autonomous driving controller 26.

[0165] The coolant that has passed through the refrigerator 30 is cooled by heat exchange with the expanded refrigerant supplied to the refrigerator 30. The coolant cooled in the refrigerator 30 is supplied to the battery module 25 and the autonomous driving controller 26. Therefore, the battery module 25 and the autonomous driving controller 26 are cooled by the cooled coolant.

[0166] That is, the second expansion valve 63 expands a part of the refrigerant in the refrigerant that has passed through the heat exchanger 53, supplies the expanded refrigerant to the refrigerator 30, and opens the refrigerant connection pipeline 61.

[0167] Therefore, a part of the refrigerant discharged from the heat exchanger 53 expands through the operation of the second expansion valve 63 to enter the low temperature and low pressure state and flows into the refrigerator 30 connected to the refrigerant connection pipeline 61.

[0168] Then, the refrigerant flowing into the refrigerator 30 exchanges heat with the coolant, and after passing through the liquid receiver 57 via the refrigerant connection pipeline 61, it flows into the compressor 59.

[0169] The coolant that has increased in temperature while cooling the battery module 25 and the autonomous driving controller 26 is cooled by exchanging heat with the low-temperature and low-pressure refrigerant in the refrigerator 30. The cooled coolant is supplied to the battery module 25 and the autonomous driving controller 26 again through the second coolant pipeline 21 and the second branch pipeline 28.

[0170] That is, when the above operations are repeatedly performed, the coolant can effectively cool the battery module 25 and the autonomous driving controller 26.

[0171] Meanwhile, the remaining refrigerant discharged from the heat exchanger 53 flows through the refrigerant pipeline 51 to cool the vehicle interior, and sequentially passes through the first expansion valve 55, the evaporator 56, and the compressor 59.

[0172] Here, the outside air flowing into the HVAC module 52 is cooled by the low-temperature refrigerant flowing into the evaporator 56 while passing through the evaporator 56.

[0173] In this case, the opening and closing door 52b closes a part of the internal condenser 52a so that the cooled outside air does not pass through the internal condenser 52a. Therefore, the cooled outside air directly flows into the vehicle interior, thereby cooling the vehicle interior.

[0174] Meanwhile, the refrigerant with an increasing condensation amount while sequentially passing through the internal condenser 52a and the heat exchanger 53 is expanded and supplied to the evaporator 56, so that the refrigerant can evaporate at a lower temperature.

[0175] That is, in this embodiment, the internal condenser 52a condenses the refrigerant, and the heat exchanger 53 additionally condenses the refrigerant, thereby advantageously subcooling the refrigerant.

[0176] In addition, since the subcooled refrigerant evaporates at a lower temperature in the evaporator 56, the temperature of the outside air passing through the evaporator 56 can be further reduced, thereby improving the cooling performance and efficiency.

[0177] Meanwhile, the operation of the gas injection unit 70 stops. Here, the refrigerant discharged from the internal condenser 52a can be supplied to the heat exchanger 53 without being expanded in the third expansion valve 74 and the fourth expansion valve 75.

[0178] When the above process is repeated, the refrigerant can cool the vehicle interior in the cooling mode of the vehicle, and at the same time, the refrigerant can cool the coolant through heat exchange while passing through the refrigerator 30.

[0179] The low-temperature coolant cooled in the refrigerator 30 flows into the battery module 25 and the autonomous driving controller 26. Therefore, the battery module 25 and the autonomous driving controller 26 can be effectively cooled by the supplied low-temperature coolant.

[0180] In this embodiment, reference will be made to Figure 4 describe the operation of recovering waste heat from an external heat source, electrical components 15, battery module 25, and autonomous driving controller 26 in the heating mode of the vehicle.

[0181] Figure 4 The operation state diagram showing the operation of recovering waste heat from an external heat source, electrical components, battery module, and autonomous driving controller in a heat pump system for a vehicle according to an embodiment of the present disclosure in the heating mode.

[0182] Refer to Figure 4 , in the initial start idle (IDLE) state or during the initial driving of the vehicle where the waste heat from the electrical components 15 is insufficient, the heat pump system can absorb external heat from the external air and waste heat from the electrical components 15, battery module 25, and autonomous driving controller 26.

[0183] First, in the cooling device 10, the first water pump 14 is operated to circulate the coolant.

[0184] Here, the first coolant line 11 connected to the electrical component 15 is opened by the operation of the first valve V1. At the same time, in a state where the first coolant line 11 connected to the first radiator 12 is closed by the operation of the first valve V1, the first branch line 18 is opened.

[0185] In this state, by the operation of the first water pump 14, the coolant passing through the electrical component 15 can be supplied to the refrigerator 30 along the opened first coolant line 11 and the first branch line 18 without passing through the first radiator 12.

[0186] At the same time, in the second cooling device 20, the second branch line 28 is opened by the operation of the second valve V2. In this state, with the second branch line 28 as a reference, the second coolant line 21 connected to the second radiator 22 is closed by the operation of the second valve V2.

[0187] Therefore, in the second cooling device 20, the coolant passing through the battery module 25 and the autonomous driving controller 26 by the operation of the second water pump 24 can be supplied to the refrigerator 30 through the second branch line 28.

[0188] That is, in the first cooling device 10, the opened first branch line 18 is connected to a part of the first coolant line 11 connected to the electrical component 15.

[0189] In addition, in the second cooling device 20, with the second branch pipeline 28 as a reference, a part of the second coolant pipelines 21 connected to the battery module 25 and the autonomous driving controller 26 are respectively connected to the second branch pipeline 28.

[0190] Then, the coolant passing through the electrical component 15 continues to circulate along the opened first coolant pipeline 11 and the first branch pipeline 18 without passing through the first radiator 12, and absorbs waste heat from the electrical component 15, thereby increasing the temperature of the coolant.

[0191] In addition, when the coolant passing through the battery module 25 and the autonomous driving controller 26 continues to circulate along the opened second coolant pipeline 21 and the second branch pipeline 28 without passing through the second radiator 22, the coolant absorbs waste heat from the battery module 25 and the autonomous driving controller 26, thereby increasing the temperature of the coolant.

[0192] The coolant with an increased temperature can be supplied to the refrigerator 30 respectively connected to the first branch pipeline 18 and the second branch pipeline 28. That is, the waste heat generated from the electrical component 15, the battery module 25, and the autonomous driving controller 26 respectively increases the temperature of the coolant circulating in the first coolant pipeline 11 and the second coolant pipeline 21.

[0193] In the air conditioning device 50, each component operates to heat the vehicle interior. Therefore, the refrigerant circulates along the refrigerant pipeline 51.

[0194] Here, the refrigerant pipeline 51 connecting the heat exchanger 53 and the evaporator 56 is closed by the operation of the first expansion valve 55.

[0195] The refrigerant connection pipeline 61 is opened by the operation of the second expansion valve 63.

[0196] The second expansion valve 63 can expand the refrigerant supplied from the heat exchanger 53 to the refrigerant connection pipeline 61 and supply it to the refrigerator 30.

[0197] Here, the fourth expansion valve 75 of the gas injection unit 70 can expand the refrigerant supplied from the internal condenser 52a and supply it to the heat exchanger 53.

[0198] Therefore, the heat exchanger 53 recovers external heat while evaporating the expanded refrigerant through the heat exchange between the expanded refrigerant and the external air.

[0199] In addition, when the coolant whose temperature has increased by absorbing waste heat from the electrical component 15, the battery module 25, and the autonomous driving controller 26 passes through the refrigerator 30 through the operations of the first water pump 14 and the second water pump 24, the coolant is recovered while increasing the temperature of the refrigerant supplied to the refrigerator 30.

[0200] That is, the refrigerator 30 receives the refrigerant supplied from the heat exchanger 53 and expanded by the operation of the second expansion valve 63 through the refrigerant connection pipeline 61, and evaporates the supplied refrigerant by exchanging heat with the coolant whose temperature rises when passing through the electrical component 15, the battery module 25, and the autonomous driving controller 26 respectively, so as to recover the waste heat from the electrical component 15, the battery module 25, and the autonomous driving controller 26.

[0201] Then, the refrigerant passing through the refrigerator 30 is supplied to the accumulator 57 along the refrigerant connection pipeline 61.

[0202] The refrigerant supplied to the accumulator 57 is separated into gas and liquid. The gaseous refrigerant in the refrigerant separated into gas and liquid is supplied to the compressor 59.

[0203] The refrigerant compressed into a high-temperature and high-pressure state in the compressor 59 flows into the internal condenser 52a.

[0204] Here, the refrigerant supplied to the internal condenser 52a can raise the temperature of the outside air flowing into the HVAC module 52.

[0205] The opening and closing door 52b is opened so that the outside air flowing into the HVAC module 52 and then passing through the evaporator 56 passes through the internal condenser 52a.

[0206] Therefore, the outside air flowing in from the outside flows in at the uncooled room temperature state when passing through the evaporator 56 without refrigerant supply. The flowing-in outside air is converted into a high-temperature state while passing through the internal condenser 52a and flows into the vehicle interior, so that the vehicle interior can be heated.

[0207] In this embodiment, reference will be made to Figure 5 Describe the operation of the gas injection part 70 when recovering waste heat from the external heat source, the electrical component 15, the battery module 25, and the autonomous driving controller 26 in the heating mode of the vehicle.

[0208] Figure 5 Show an operation state diagram of recovering waste heat from an external heat source, an electrical component, a battery module, and an autonomous driving controller and the operation of a gas injection part in a heat pump system for a vehicle according to an embodiment of the present disclosure in a heating mode.

[0209] Refer to Figure 5 In the initial start idle (IDLE) state or the initial driving period of the vehicle where the waste heat from the electrical component 15 is insufficient, the heat pump system can absorb the external heat from the outside air and the waste heat from the electrical component 15, the battery module 25, and the autonomous driving controller 26.

[0210] First, in the cooling device 10, the first water pump 14 is operated to circulate the coolant.

[0211] Here, the first coolant pipeline 11 connected to the electrical component 15 is opened by the operation of the first valve V1. At the same time, the first coolant pipeline 11 connected to the first radiator 12 is closed by the operation of the first valve V1, and the first branch pipeline 18 is opened.

[0212] In this state, by the operation of the first water pump 14, the coolant passing through the electrical component 15 can be supplied to the refrigerator 30 along the opened first coolant pipeline 11 and the first branch pipeline 18 without passing through the first radiator 12.

[0213] At the same time, in the second cooling device 20, the second branch pipeline 28 is opened by the operation of the second valve V2. In this state, based on the second branch pipeline 28, the second coolant pipeline 21 connected to the second radiator 22 is closed by the operation of the second valve V2.

[0214] Therefore, in the second cooling device 20, the coolant passing through the battery module 25 and the autonomous driving controller 26 by the operation of the second water pump 24 can be supplied to the refrigerator 30 through the second branch pipeline 28.

[0215] That is, in the first cooling device 10, the opened first branch pipeline 18 is connected to a part of the first coolant pipeline 11 connected to the electrical component 15.

[0216] In addition, in the second cooling device 20, based on the second branch pipeline 28, a part of the second coolant pipeline 21 connected to the battery module 25 and the autonomous driving controller 26 is respectively connected to the second branch pipeline 28.

[0217] Then, the coolant passing through the electrical component 15 continues to circulate along the opened first coolant pipeline 11 and the first branch pipeline 18 without passing through the first radiator 12, and absorbs waste heat from the electrical component 15, so that the temperature of the coolant rises.

[0218] In addition, when the coolant passing through the battery module 25 and the autonomous driving controller 26 continues to circulate along the opened second coolant pipeline 21 and the second branch pipeline 28 without passing through the second radiator 22, the coolant absorbs waste heat from the battery module 25 and the autonomous driving controller 26, so that the temperature of the coolant rises.

[0219] The coolant with an increased temperature can be supplied to the refrigerator 30 respectively connected to the first branch pipeline 18 and the second branch pipeline 28. That is, the waste heat generated from the electrical component 15, the battery module 25 and the autonomous driving controller 26 respectively raises the temperature of the coolant circulating in the first coolant pipeline 11 and the second coolant pipeline 21.

[0220] In the air conditioner 50, each component operates to heat the vehicle interior. Therefore, the refrigerant circulates along the refrigerant pipeline 51.

[0221] Here, the refrigerant pipeline 51 connecting the heat exchanger 53 and the evaporator 56 is closed by the operation of the first expansion valve 55.

[0222] The refrigerant connection pipeline 61 is opened by the operation of the second expansion valve 63.

[0223] The second expansion valve 63 can expand the refrigerant supplied from the heat exchanger 53 to the refrigerant connection pipeline 61 and supply it to the refrigerator 30.

[0224] Here, the fourth expansion valve 75 of the gas injection part 70 can expand the refrigerant supplied from the internal condenser 52a and supply it to the heat exchanger 53.

[0225] Therefore, the heat exchanger 53 recovers external heat while evaporating the expanded refrigerant through the heat exchange between the expanded refrigerant and the external air.

[0226] In addition, when the coolant whose temperature has risen by absorbing waste heat from the electrical component 15, the battery module 25, and the autonomous driving controller 26 passes through the refrigerator 30 by the operation of the first water pump 14 and the second water pump 24, the coolant is recovered while raising the temperature of the refrigerant supplied to the refrigerator 30.

[0227] That is, the refrigerator 30 receives the refrigerant supplied from the heat exchanger 53 and expanded by the operation of the second expansion valve 63 through the refrigerant connection pipeline 61, and evaporates the supplied refrigerant by exchanging heat with the coolant whose temperature has risen when passing through the electrical component 15, the battery module 25, and the autonomous driving controller 26 respectively, so as to recover waste heat from the electrical component 15, the battery module 25, and the autonomous driving controller 26.

[0228] Then, the refrigerant passing through the refrigerator 30 is supplied to the accumulator 57 along the refrigerant connection pipeline 61.

[0229] The refrigerant supplied to the accumulator 57 is separated into gas and liquid. The gaseous refrigerant in the refrigerant separated into gas and liquid is supplied to the compressor 59.

[0230] The refrigerant compressed into a high-temperature and high-pressure state in the compressor 59 flows into the internal condenser 52a.

[0231] Here, the refrigerant supplied to the internal condenser 52a can raise the temperature of the external air flowing into the HVAC module 52.

[0232] Open the opening / closing door 52b so that the outside air flowing into the HVAC module 52 and then passing through the evaporator 56 passes through the internal condenser 52a.

[0233] Therefore, the outside air flowing in from the outside enters in an uncooled room temperature state when passing through the evaporator 56 without refrigerant supply. The flowing-in outside air is converted to a high temperature state while passing through the internal condenser 52a and flows into the vehicle interior, thereby heating the vehicle interior.

[0234] Here, when the gas injection unit 70 operates, the bypass line 72 is opened by the operation of the bypass valve 73.

[0235] In this state, the third expansion valve 74 expands the refrigerant supplied from the internal condenser 52a and supplies it to the gas-liquid separator 71.

[0236] Among the refrigerant supplied to the gas-liquid separator 71, the gaseous refrigerant is supplied to the compressor 59 through the opened bypass line 72.

[0237] That is, the gas injection unit 70 causes the gaseous refrigerant that has undergone heat exchange while passing through the gas-liquid separator 71 to flow back into the compressor 59 through the bypass line 72, thereby increasing the flow rate of the refrigerant circulating in the refrigerant line 51.

[0238] In addition, the liquid refrigerant discharged from the gas-liquid separator 71 through the refrigerant line 51 flows into the heat exchanger 53 along the refrigerant line 51 opened by the operation of the fourth expansion valve 75.

[0239] In this case, the fourth expansion valve 75 can expand the refrigerant supplied from the gas-liquid separator 71.

[0240] That is, the gas-liquid separator 71 of the gas injection unit 70 can bypass the gaseous refrigerant to the compressor 59 through the bypass line 72 and supply the liquid refrigerant to the fourth expansion valve 75.

[0241] Then, the refrigerant can expand while passing through the fourth expansion valve 75 and can evaporate by exchanging heat with the outside air in the heat exchanger 53.

[0242] In addition, the refrigerant can smoothly recover the waste heat from the coolant whose temperature has risen while passing through the electrical component 15 and the battery module 25 in the refrigerator 30, thereby improving the heating performance and efficiency.

[0243] That is, when the heat pump system according to the present embodiment needs to be heated in the initial start idle state (IDLE) or the initial driving state of the vehicle, it absorbs external heat in the heat exchanger 53 and raises the temperature of the refrigerant by utilizing the waste heat of the electrical component 15, the battery module 25, and the autonomous driving controller 26. As a result, the power consumption of the compressor 59 can be reduced, and the heating efficiency can be improved.

[0244] In addition, the present disclosure can improve the heating efficiency and performance while minimizing the usage of a separate electric heater.

[0245] Furthermore, the gas injection unit 70 can maximize the heating performance by increasing the flow rate of the refrigerant circulating in the refrigerant pipeline 51.

[0246] Meanwhile, in the present embodiment, the case of recovering the waste heat from the electrical component 15, the battery module 25, and the autonomous driving controller 26 together has been described as an example. However, the present disclosure is not limited thereto, and the waste heat from the electrical component 15 or the waste heat from the battery module 25 and the autonomous driving controller 26 can be selectively recovered.

[0247] That is, when the waste heat from the electrical component 15 is not recovered, the operation of the first cooling device 10 can be stopped, and when the waste heat from the battery module 25 and the autonomous driving controller 26 is not recovered, the operation of the second cooling device 20 can be stopped.

[0248] In the present embodiment, reference will be made to Figure 6 Describe the case of operating the gas injection unit 70 while recovering the waste heat from the electrical component 15 in the heating mode of the vehicle.

[0249] Figure 6 The operation state diagram showing the recovery of waste heat from the electrical component and the operation of the gas injection unit according to the heating mode in the heat pump system for a vehicle according to an embodiment of the present disclosure.

[0250] Refer to Figure 6 The heat pump system can recover the waste heat from the electrical component 15 and use the waste heat for indoor heating.

[0251] First, in the cooling device 10, the first water pump 14 is operated to circulate the coolant.

[0252] Here, the first coolant pipeline 11 connected to the electrical component 15 is opened by the operation of the first valve V1. Meanwhile, in the state where the first coolant pipeline 11 connected to the first radiator 12 is closed by the operation of the first valve V1, the first branch pipeline 18 is opened.

[0253] In this state, by the operation of the first water pump 14, the coolant passing through the electrical component 15 can be supplied to the refrigerator 30 along the opened first coolant pipeline 11 and the first branch pipeline 18 without passing through the first radiator 12.

[0254] At the same time, the operation of the second cooling device 20 stops.

[0255] That is, in the first cooling device 10, the opened first branch pipeline 18 and a part of the first coolant pipeline 11 connected to the electrical component 15 are connected.

[0256] Then, the coolant passing through the electrical component 15 continues to circulate along the opened first coolant pipeline 11 and the first branch pipeline 18 without passing through the first radiator 12, and absorbs waste heat from the electrical component 15, so the temperature of the coolant rises.

[0257] The coolant with an increased temperature can be supplied to the refrigerator 30 connected to the first branch pipeline 18. That is, the waste heat generated from the electrical component 15 raises the temperature of the coolant circulating in the first coolant pipeline 11.

[0258] In the air conditioning device 50, each component operates to heat the vehicle interior. Therefore, the refrigerant circulates along the refrigerant pipeline 51.

[0259] Here, the refrigerant pipeline 51 connecting the heat exchanger 53 and the evaporator 56 is closed by the operation of the first expansion valve 55.

[0260] The refrigerant connection pipeline 61 is opened by the operation of the second expansion valve 63.

[0261] The second expansion valve 63 can expand the refrigerant supplied from the heat exchanger 53 to the refrigerant connection pipeline 61 and supply it to the refrigerator 30.

[0262] Here, the fourth expansion valve 75 of the gas injection part 70 can expand the refrigerant supplied from the internal condenser 52a.

[0263] At the same time, when the coolant whose temperature has risen by absorbing the waste heat of the electrical component 15 passes through the refrigerator 30 by the operation of the first water pump 14, the coolant is recovered while raising the temperature of the refrigerant supplied to the refrigerator 30.

[0264] That is, the refrigerator 30 receives the refrigerant supplied from the heat exchanger 53 and expanded by the operation of the second expansion valve 63 through the refrigerant connection pipeline 61, and evaporates the supplied refrigerant by exchanging heat with the coolant whose temperature has risen when passing through the electrical component 15, thereby recovering the waste heat from the electrical component 15.

[0265] Then, the refrigerant that has passed through the refrigerator 30 is supplied to the liquid receiver 57 along the refrigerant connection pipeline 61.

[0266] The refrigerant supplied to the liquid receiver 57 is separated into gas and liquid. The gaseous refrigerant in the refrigerant separated into gas and liquid is supplied to the compressor 59.

[0267] The refrigerant compressed into a high-temperature and high-pressure state in the compressor 59 flows into the internal condenser 52a.

[0268] Here, the refrigerant supplied to the internal condenser 52a can raise the temperature of the outside air flowing into the HVAC module 52.

[0269] The opening and closing door 52b is opened so that the outside air flowing into the HVAC module 52 and then passing through the evaporator 56 passes through the internal condenser 52a.

[0270] Therefore, the outside air flowing in from the outside flows in at the uncooled room temperature state when passing through the evaporator 56 where no refrigerant is supplied. The flowing-in outside air is converted to a high-temperature state while passing through the internal condenser 52a and flows into the vehicle interior, thereby heating the vehicle interior.

[0271] Here, in the gas injection part 70, the bypass pipeline 72 is opened by the operation of the bypass valve 73.

[0272] In this state, the third expansion valve 74 expands the refrigerant supplied from the internal condenser 52a and supplies it to the gas-liquid separator 71.

[0273] Among the refrigerant supplied to the gas-liquid separator 71, the gaseous refrigerant is supplied to the compressor 59 through the opened bypass pipeline 72.

[0274] That is, the gas injection part 70 makes the gaseous refrigerant that has undergone heat exchange while passing through the gas-liquid separator 71 flow back into the compressor 59 through the bypass pipeline 72, thereby increasing the flow rate of the refrigerant circulating in the refrigerant pipeline 51.

[0275] In addition, the liquid refrigerant discharged from the gas-liquid separator 71 through the refrigerant pipeline 51 flows into the refrigerant pipeline 51 in an expanded state through the operation of the fourth expansion valve 75.

[0276] Here, the refrigerant valve 64 can open the refrigerant branch pipeline 65 so that the refrigerant expanded while passing through the fourth expansion valve 75 is not supplied to the heat exchanger 53.

[0277] Therefore, the refrigerant flowing into the refrigerant branch pipeline 65 through the refrigerant valve 64 can flow into the refrigerant connection pipeline 61 opened by the operation of the second expansion valve 63.

[0278] That is, the gas-liquid separator 71 of the gas injection unit 70 can bypass the gaseous refrigerant to the compressor 59 through the bypass line 72, and can supply the liquid refrigerant to the fourth expansion valve 75.

[0279] Then, the refrigerant expands while passing through the fourth expansion valve 75, and is supplied to the chiller 30 along the refrigerant branch line 65 and the refrigerant connection line 61. The refrigerant supplied to the chiller 30 can be evaporated by exchanging heat with the coolant supplied through the first branch line 18.

[0280] In addition, the refrigerant can smoothly recover the waste heat from the coolant whose temperature has risen when passing through the electrical component 15 in the chiller 30, thereby improving the heating performance and efficiency.

[0281] That is, the heat pump system according to the present embodiment utilizes the waste heat of the electrical component 15 to raise the temperature of the refrigerant in the heating mode of the vehicle, thereby reducing the power consumption of the compressor 59 and improving the heating efficiency.

[0282] In addition, the present disclosure can improve the heating efficiency and performance while minimizing the usage amount of a separate electric heater.

[0283] Furthermore, the gas injection unit 70 can maximize the heating performance by increasing the flow rate of the refrigerant circulating in the refrigerant line 51.

[0284] In the present embodiment, reference will be made to Figure 7 describe the operation of the dehumidification mode of the vehicle.

[0285] Figure 7 The operation state diagram of the dehumidification mode in the heat pump system for a vehicle according to an embodiment of the present disclosure is shown.

[0286] Referring to Figure 7 , the heat pump system can perform the dehumidification mode while heating the vehicle interior.

[0287] First, the first cooling device 10 and the second cooling device 20 stop operating.

[0288] In the air conditioning device 50, each component operates to heat and dehumidify the vehicle interior. Therefore, the refrigerant circulates along the refrigerant line 51.

[0289] In this case, the operation of the gas injection unit 70 can be stopped.

[0290] The refrigerant line 51 connecting the heat exchanger 53 and the evaporator 56 is opened by the operation of the first expansion valve 55.

[0291] The refrigerant connection line 61 is closed by the operation of the second expansion valve 63.

[0292] Here, the first expansion valve 55 can expand the refrigerant supplied to the refrigerant pipeline 51 so that the expanded refrigerant can be supplied to the evaporator 56.

[0293] In addition, the third expansion valve 74 and the fourth expansion valve 75 can allow the refrigerant to flow through the refrigerant pipeline 51 without expanding the refrigerant supplied from the internal condenser 52a.

[0294] In this embodiment, the refrigerant valve 64 can open the refrigerant branch pipeline 65 so that the refrigerant supplied from the internal condenser 52a can be prevented from being supplied to the heat exchanger 53.

[0295] Therefore, the refrigerant flowing into the refrigerant branch pipeline 65 through the refrigerant valve 64 can flow into the evaporator 56 along the refrigerant pipeline 51 opened by the operation of the first expansion valve 55.

[0296] The expanded refrigerant supplied to the evaporator 56 through the operation of the first expansion valve 55 exchanges heat with the outside air passing through the evaporator 56, and then is supplied to the compressor 59 through the accumulator 57 along the refrigerant pipeline 51.

[0297] In addition, the refrigerant compressed into a high-temperature and high-pressure state in the compressor 59 flows into the internal condenser 52a.

[0298] Here, the opening and closing door 52b is opened so that the outside air flowing into the HVAC module 52 and then passing through the evaporator 56 passes through the internal condenser 52a.

[0299] That is, the outside air flowing into the HVAC module 52 is dehumidified by the low-temperature refrigerant flowing into the evaporator 56 while passing through the evaporator 56. Then, while passing through the internal condenser 52a, the outside air is converted to a high-temperature state and flows into the vehicle interior, thereby heating and dehumidifying the vehicle interior.

[0300] Therefore, as described above, according to the heat pump system for a vehicle based on an embodiment of the present disclosure, by using a chiller 30 that exchanges heat between a coolant and a refrigerant to control the temperatures of the battery module 25 and the autonomous driving controller 26 according to the mode of the vehicle, the entire system can be simplified.

[0301] In addition, the present disclosure can effectively control the temperature of the battery module 25 to make the battery module 25 operate in an optimal performance state, and can increase the total mileage of the vehicle through effective management of the battery module 25.

[0302] In addition, the present disclosure can improve the heating efficiency by selectively using an external heat source or the waste heat of the electrical component 15, the battery module 25, or the autonomous driving controller 26 in the heating mode of the vehicle.

[0303] In addition, the present disclosure can maximize heating performance by applying a gas injection unit 70 to selectively increase the refrigerant flow rate in the heating mode.

[0304] Furthermore, the present disclosure can reduce manufacturing costs and weight by simplifying the entire system, and can improve space utilization.

[0305] Although the present disclosure has been described in connection with what are presently considered to be practical embodiments, it is to be understood that the present disclosure is not limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A heat pump system for a vehicle, comprising: A first cooling device, including a first radiator, a first water pump, and a first valve connected through a first coolant pipeline, wherein the first cooling device is configured to circulate a first coolant in the first coolant pipeline to cool at least one electrical component disposed in the first coolant pipeline; A second cooling device, including a second radiator, a second water pump, a battery module, an autonomous driving controller, and a second valve connected through a second coolant pipeline, wherein the second cooling device is configured to circulate a second coolant to the battery module and the autonomous driving controller; A refrigerator, a first branch pipeline of the first coolant pipeline connected to the refrigerator through the first valve and a second branch pipeline of the second coolant pipeline connected to the refrigerator through the second valve respectively pass through the refrigerator, and the refrigerator is connected to a refrigerant pipeline of an air conditioning device through a refrigerant connection pipeline, wherein the refrigerator is configured to control the temperature of the second coolant by exchanging heat between the coolant selectively flowing into the first branch pipeline or the second branch pipeline and the refrigerant supplied from the air conditioning device; And A gas injection part, disposed in the air conditioning device, and increasing the flow rate of the refrigerant circulating in the refrigerant pipeline by bypassing a part of the refrigerant in the refrigerant passing through the internal condenser to the compressor.

2. The heat pump system for a vehicle according to claim 1, wherein One end of the first branch pipeline is connected to the first coolant pipeline through the first valve, and the other end of the first branch pipeline is connected to the first coolant pipeline connected to the electrical component; And One end of the second branch pipeline is connected to the second coolant pipeline through the second valve, the second valve is disposed in the second coolant pipeline between the second radiator and the second water pump, and the other end of the second branch pipeline is connected to the second coolant pipeline between the autonomous driving controller and the second radiator.

3. The heat pump system for a vehicle according to claim 1, wherein The air conditioning device includes: An HVAC module, including: an evaporator connected through the refrigerant pipeline; and a door, controlling the inflow of outside air passing through the evaporator into the internal condenser according to the cooling, heating, and dehumidifying modes of the vehicle; A heat exchanger, exchanging heat between the refrigerant supplied through the refrigerant pipeline and outside air; A compressor, connected between the evaporator and the internal condenser through the refrigerant pipeline; A first expansion valve, disposed in the refrigerant pipeline between the heat exchanger and the evaporator; A second expansion valve, disposed in the refrigerant connection pipeline; and A liquid receiver, disposed in the refrigerant pipeline between the evaporator and the compressor, and connected to the refrigerant connection pipeline.

4. The heat pump system for a vehicle according to claim 3, wherein When cooling the battery module by using a coolant that exchanges heat with the refrigerant, the second expansion valve expands the refrigerant flowing in through the refrigerant connection pipeline and flows into the refrigerator.

5. The heat pump system for a vehicle according to claim 3, wherein the gas injection unit includes: a gas-liquid separator disposed in the refrigerant pipeline between the internal condenser and the heat exchanger, wherein the gas-liquid separator is configured to discharge gaseous refrigerant and liquid refrigerant in the refrigerant passing through the internal condenser; a bypass pipeline connecting the gas-liquid separator and the compressor, the bypass pipeline being configured to supply the gaseous refrigerant from the gas-liquid separator to the compressor; a bypass valve disposed in the bypass pipeline; a third expansion valve disposed in the refrigerant pipeline between the internal condenser and the gas-liquid separator; and a fourth expansion valve disposed in the refrigerant pipeline between the gas-liquid separator and the heat exchanger.

6. The heat pump system for a vehicle according to claim 5, wherein when the gas injection unit operates in the heating mode of the vehicle, the third expansion valve expands the refrigerant supplied from the internal condenser and supplies it to the gas-liquid separator; and the fourth expansion valve expands the refrigerant supplied from the gas-liquid separator and flows through the refrigerant pipeline.

7. The heat pump system for a vehicle according to claim 5, wherein when the gas injection unit does not operate in the heating mode of the vehicle, the third expansion valve allows the refrigerant supplied from the internal condenser to pass through; and the fourth expansion valve expands the refrigerant passing through the gas-liquid separator and supplies it to the heat exchanger.

8. The heat pump system for a vehicle according to claim 5, wherein in the cooling mode or dehumidifying mode of the vehicle, the third expansion valve and the fourth expansion valve do not expand the refrigerant supplied from the internal condenser but allow the refrigerant to flow through the refrigerant pipeline.

9. The heat pump system for a vehicle according to claim 5, wherein when the gas injection unit operates, the bypass valve operates to open the bypass pipeline.

10. The heat pump system for a vehicle according to claim 5, wherein the first expansion valve, the second expansion valve, the third expansion valve, and the fourth expansion valve are electronic expansion valves that expand the refrigerant while controlling the flow of the refrigerant.

11. The heat pump system for a vehicle according to claim 5, wherein according to the selective operation of the fourth expansion valve, the heat exchanger condenses or evaporates the refrigerant condensed in the internal condenser through heat exchange with external air.

12. The heat pump system for a vehicle according to claim 5, wherein the air conditioning device further includes a refrigerant branch pipeline that connects the refrigerant pipeline between the heat exchanger and the first expansion valve through a refrigerant valve, and the refrigerant valve is disposed in the refrigerant pipeline between the heat exchanger and the gas injection unit.

13. The heat pump system for a vehicle according to claim 12, wherein, When no external heat is recovered in the dehumidification mode or heating mode of the vehicle, the refrigerant valve opens the refrigerant branch line and closes the part of the refrigerant line connected to the heat exchanger.

14. The heat pump system for a vehicle according to claim 12, wherein, When the gas injection unit operates while recovering waste heat from the electrical component in the heating mode of the vehicle, In a state where the first coolant line connected to the electrical component is opened by the first valve and the first coolant line connected to the first radiator is closed by the first valve, the first branch line is opened; In the first cooling device, the first coolant passing through the electrical component by the first water pump is supplied to the refrigerator through the opened first branch line without passing through the first radiator; The second cooling device stops operating; In the air conditioning device, the refrigerant line connected to the evaporator is closed by the first expansion valve; The refrigerant connection line is opened by the second expansion valve; The second expansion valve expands the refrigerant supplied to the refrigerant connection line and supplies it to the refrigerator; In the gas injection unit, the bypass line is opened by the bypass valve, the third expansion valve expands the refrigerant and supplies it to the gas-liquid separator, and the fourth expansion valve expands the refrigerant passing through the gas-liquid separator; and The refrigerant valve opens the refrigerant branch line so that the refrigerant expanded while passing through the fourth expansion valve is not supplied to the heat exchanger.

15. The heat pump system for a vehicle according to claim 12, wherein, In the dehumidification mode of the vehicle, the first cooling device and the second cooling device stop operating; In the air conditioning device, the refrigerant line connected to the evaporator is opened by the first expansion valve; The refrigerant connection line is closed by the second expansion valve; and The refrigerant valve opens the refrigerant branch line so that the refrigerant supplied from the internal condenser is not supplied to the heat exchanger.

16. The heat pump system for a vehicle according to claim 3, wherein, When cooling the battery module and the autonomous driving controller in the cooling mode of the vehicle, The second branch line is opened by the second valve, and based on the second branch line, the second coolant line connected to the second radiator is closed; In the second cooling device, the second coolant is circulated in the opened second branch line and the opened second coolant line by the second water pump, and the second coolant that has passed through the refrigerator is supplied to the battery module and the autonomous driving controller; In the air conditioning device, in a state where the refrigerant connection line is opened by the second expansion valve, the refrigerant circulates along the refrigerant line and the refrigerant connection line; and The first expansion valve and the second expansion valve expand the refrigerant such that the expanded refrigerant is supplied to the evaporator and the refrigerator respectively.

17. The heat pump system for a vehicle according to claim 3, wherein, when recovering waste heat from an external heat source, the electrical component, the battery module, and the autonomous driving controller in a heating mode of the vehicle, in a state where the first coolant line connected to the electrical component is opened by the first valve and the first coolant line connected to the first radiator is closed by the first valve, the first branch line is opened; in the first cooling device, the first coolant passing through the electrical component by the first water pump is supplied to the refrigerator through the opened first branch line without passing through the first radiator; in a state where the second branch line is opened by the second valve, based on the second branch line, the second coolant line connected to the second radiator is closed; in the second cooling device, the second coolant passing through the battery module and the autonomous driving controller by the second water pump is supplied to the refrigerator through the second branch line; in the air conditioning device, the refrigerant line connecting the heat exchanger and the evaporator is closed by the first expansion valve; the refrigerant connection line is opened by the second expansion valve; and the second expansion valve expands the refrigerant supplied to the refrigerant connection line and supplies it to the refrigerator.

18. The heat pump system for a vehicle according to claim 3, wherein, the heat exchanger is an air-cooled heat exchanger.

19. The heat pump system for a vehicle according to claim 1, wherein, when cooling the electrical component, the battery module, and the autonomous driving controller, the first branch line is closed by the first valve; the second branch line is closed by the second valve; the first coolant cooled by the first radiator is supplied to the electrical component along the first coolant line by the first water pump; and the second coolant cooled by the second radiator is supplied to the battery module and the autonomous driving controller along the second coolant line by the second water pump.

20. The heat pump system for a vehicle according to claim 1, wherein, the electrical component includes a power control device, an inverter, an on-board charger (OBC), or a power converter.

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