HEAT PUMP SYSTEM FOR A VEHICLE

Abstract

A heat pump system for a vehicle capable of improving cooling and heating performance is achieved by selectively operating a gas injection device (30) in an air conditioning mode of the vehicle interior to increase the refrigerant flow rate. Furthermore, the heat pump system reduces manufacturing costs and weight by using a single heat exchanger (31) for the entire system, configured to exchange heat between at least two refrigerants with different temperatures and states. The implementation of the gas injection device (30) also reduces the overall number of components.

Description

Technical field

[0001] The present disclosure relates to a heat pump system for a vehicle, and in particular a heat pump system for a vehicle that can improve cooling and heating performance. Description of the related technique

[0002] A vehicle air conditioning system has an air conditioning unit that circulates a refrigerant to heat or cool the interior of a vehicle.

[0003] The air conditioning unit, which maintains the interior of the vehicle at a suitable temperature regardless of changes in the outside temperature in order to maintain a comfortable interior climate, is designed to heat or cool the interior of the vehicle by heat exchange using a condenser and an evaporator in a process in which a refrigerant discharged by a compressor operation is circulated through the condenser, a dryer, an expansion valve and the evaporator back to the compressor.

[0004] In other words, in summer the air conditioning unit lowers the temperature and humidity in the interior by condensing a high-temperature, high-pressure gas phase refrigerant compressed by the compressor through the condenser, passing the refrigerant through the dryer and expansion valve, and then evaporating the refrigerant in the evaporator.

[0005] Given the ever-increasing interest in energy efficiency and pollution problems, the development of environmentally friendly vehicles that can largely replace internal combustion engines is necessary, and environmentally friendly vehicles are divided into electric vehicles, which are powered by fuel cells or electricity as a power source, and hybrid vehicles, which are powered by an internal combustion engine and a battery.

[0006] In contrast to the air conditioning system of a conventional vehicle, an electric vehicle or a hybrid vehicle among these environmentally friendly vehicles does not use a separate heating system, and an air conditioning system used in an environmentally friendly vehicle is called a heat pump system.

[0007] An electric vehicle powered by a fuel cell generates propulsion by converting the chemical reaction energy between oxygen and hydrogen into electrical energy. This process, a chemical reaction within the fuel cell, produces heat energy. Therefore, to ensure the fuel cell's performance, it is necessary to effectively dissipate this generated heat.

[0008] Furthermore, a hybrid vehicle generates propulsion power by driving a motor powered by electricity from the fuel cell or electric battery described above, together with an internal combustion engine that runs on a conventional fuel such as gasoline. Therefore, the heat generated by the fuel cell or battery and the motor must be effectively dissipated to ensure the motor's performance.

[0009] Therefore, in a hybrid vehicle or an electric vehicle according to the related technology, a cooling device, a heat pump system and a battery cooling system should each be set up as separate closed circuits in order to prevent or dissipate heat generation from the engine, an electrical component and the battery which has a fuel cell.

[0010] This increases the size and weight of a cooling module located at the front of the vehicle and complicates the arrangement of the connecting lines that carry a refrigerant and coolant to the heat pump system, cooling unit and battery cooling system in an engine compartment.

[0011] Furthermore, since a battery cooling system is separately provided to heat or cool the battery according to the vehicle's condition in order to achieve optimal battery performance, a multiple of valves are used to selectively connect connecting lines, which can cause noise and vibrations due to frequent opening and closing of the valves to enter the vehicle interior, thus impairing the vehicle's driving comfort.

[0012] Furthermore, the heating performance for heating the vehicle interior may be impaired due to the lack of a heat source, the electricity consumption may be increased by the use of the electric heater, and the electricity consumption of the compressor may increase.

[0013] The information disclosed above in this background section serves only to provide a better understanding of the background of the disclosure and may therefore contain information that is not part of the prior art already known to the person skilled in the art. BRIEF EXPLANATION

[0014] The present disclosure relates to a heat pump system for a vehicle which can improve cooling and heating performance by employing a gas injection device that operates selectively in an air conditioning mode of the vehicle interior to increase the flow rate of the refrigerant.

[0015] Furthermore, the present disclosure provides a heat pump system for a vehicle which is able to reduce manufacturing costs and weight by using a single heat exchanger for the overall system, which is set up to allow at least two refrigerants with different temperatures and states to exchange heat with each other, and by using a gas injection device, thereby reducing the total number of components.

[0016] A heat pump system for a vehicle comprises a compressor designed to compress a refrigerant. The heat pump system also includes a condenser connected to the compressor via a refrigerant line, designed to condense the refrigerant. Furthermore, the heat pump system includes a first expansion valve connected to the condenser via the refrigerant line, and an evaporator connected to the compressor via the refrigerant line, designed to evaporate the supplied refrigerant. The heat pump system also includes a connecting line with a first end connected to the refrigerant line between the condenser and the first expansion valve, and a second end connected to the refrigerant line between the compressor and the evaporator.The heat pump system further comprises a cooler or heat exchanger unit (e.g., refrigerant-to-refrigerant heat exchanger; hereinafter referred to as "cooler") which is provided on / in the connecting line and is configured to regulate the refrigerant temperature by heat exchange between the refrigerant introduced through the connecting line and a selectively introduced coolant. The heat pump system further comprises a second expansion valve which is provided on / in the connecting line at an upstream end of the cooler. The heat pump system further comprises a heat exchanger which is connected to the refrigerant line connecting the condenser and the first expansion valve, and to the refrigerant line connecting the evaporator and the compressor.The heat pump system further comprises a gas injection device, which includes the heat exchanger, is located on / in the refrigerant line between the condenser and the first expansion valve. This device is configured to expand the refrigerant selectively introduced from the condenser and to supply the expanded refrigerant to the heat exchanger. The refrigerant, after heat exchange in the heat exchanger, is then supplied to the compressor, thereby increasing the flow rate of the refrigerant circulating in the refrigerant line. The refrigerant flow rate is controlled by an operational control system for the gas injection device, based on at least one mode for setting a vehicle interior temperature.

[0017] For example, the gas injection device may further comprise a first line having a first end connected to the refrigerant line between the condenser and the heat exchanger, and a second end connected to the heat exchanger. For example, the gas injection device may further comprise a third expansion valve provided on / in the first line at an upstream end of the heat exchanger. For example, the gas injection device may further comprise a second line having a first end connected to the heat exchanger and a second end connected to the compressor.

[0018] For example, the heat exchanger may have a first heat exchange device (e.g., a first section of the heat exchanger) configured to allow the refrigerant supplied from the condenser via the refrigerant line to exchange heat with the refrigerant supplied from the evaporator or cooler. For example, the heat exchanger may have a second heat exchange device (e.g., a second section of the heat exchanger) configured to allow the refrigerant supplied from the condenser via the refrigerant line to exchange heat with the refrigerant expanded in the third expansion valve and supplied through the first line. For example, the heat exchanger may further include a barrier fin or...have a partition (which, for example, allows refrigerant from the refrigerant line to pass into the first and second heat exchanger; hereinafter referred to as a partition) that is designed to separate the first heat exchanger and the second heat exchanger from each other.

[0019] For example, the barrier rib can be designed to allow the refrigerant supplied from the condenser to flow to the first heat exchanger and the second heat exchanger, so that the refrigerant supplied from the condenser through the refrigerant line flows together in the first heat exchanger and the second heat exchanger, and to prevent the refrigerant supplied from the evaporator or cooler to the first heat exchanger via the refrigerant line from mixing with the refrigerant supplied from the third expansion valve to the second heat exchanger via the first line.

[0020] For example, if the refrigerant expanded in the third expansion valve is supplied to the heat exchanger via the first line, the heat exchanger may be designed to evaporate the refrigerant supplied by the third expansion valve by heat exchange with the refrigerant supplied by the condenser, thus increasing the flow rate of the refrigerant circulating in the refrigerant line, and to supply the evaporated refrigerant to the compressor via the second line.

[0021] For example, if operation of the gas injection device is required, the third expansion valve may be set up to expand the refrigerant supplied from the condenser via the first line and supply the expanded refrigerant to the heat exchanger.

[0022] For example, the at least one mode may have a first cooling mode for cooling the vehicle interior, with the gas injection device not operating, a second cooling mode for cooling the vehicle interior, with the gas injection device operating, a first heating mode for heating the vehicle interior, with the gas injection device not operating, and a second heating mode for heating the vehicle interior, with the gas injection device operating.

[0023] For example, in the first cooling mode, the refrigerant line connecting the compressor, condenser, first expansion valve, and evaporator can be open. For example, the first line can be closed by the third expansion valve. For example, the second line can be closed. For example, the first expansion valve can expand the refrigerant introduced through the refrigerant line and supply the expanded refrigerant to the evaporator. For example, the third expansion valve can cease operation (e.g., be closed), and the heat exchanger can allow the refrigerant flowing from the condenser through the first heat exchanger and the refrigerant flowing from the evaporator through the first heat exchanger to exchange heat with each other.

[0024] For example, if cooling of a battery module is required in the first cooling mode, the connecting line through the second expansion valve can be open. The second expansion valve can then expand the refrigerant introduced through the connecting line and supply the expanded refrigerant to the cooler. The refrigerant flowing through the cooler, along with the refrigerant discharged from the evaporator, can then flow through the first heat exchanger.

[0025] For example, in the second cooling mode, the refrigerant line connecting the compressor, condenser, first expansion valve, and evaporator can be open. For example, the first line can be opened by the third expansion valve. For example, the second line can be open. For example, the first expansion valve can expand the refrigerant introduced through the refrigerant line and supply the expanded refrigerant to the evaporator. For example, the third expansion valve can expand the refrigerant introduced through the first line and supply the expanded refrigerant via the first line to the heat exchanger. For example, the first heat exchanger in the heat exchanger can allow the refrigerant passing from the condenser through the first heat exchanger and the refrigerant passing from the evaporator through the first heat exchanger to exchange heat with each other.For example, the second heat exchanger in the heat exchanger can allow the refrigerant passing from the condenser through the second heat exchanger and the refrigerant passing from the third expansion valve through the second heat exchanger to exchange heat with each other, and can supply the gaseous refrigerant to the compressor via the open second line.

[0026] For example, if cooling of a battery module is required in the second cooling mode, the connecting line through the second expansion valve can be open. For example, the second expansion valve can expand the refrigerant introduced through the connecting line and supply the expanded refrigerant to the cooler, and the refrigerant that has passed through the cooler, together with the refrigerant discharged from the evaporator, can pass through the first heat exchanger.

[0027] For example, in the first heating mode, a section of the refrigerant line connecting the compressor and the condenser may be open. For example, a section of the refrigerant line connecting the condenser to the first end of the connecting line and a section of the refrigerant line leading from the second end of the connecting line to the compressor may be open. For example, a section of the refrigerant line connecting the evaporator to the first end of the connecting line and a section of the refrigerant line leading from the second end of the connecting line to the evaporator may be closed by the first expansion valve. For example, the connecting line may be open by the second expansion valve, the first line may be closed by the third expansion valve, and the second line may be closed.

[0028] For example, the first expansion valve can cease operation (e.g., be closed). For example, the second expansion valve can expand the refrigerant introduced through the connecting line and supply the expanded refrigerant to the cooler. For example, the third expansion valve can cease operation (e.g., be closed), and the heat exchanger can allow the refrigerant passing from the condenser through the first heat exchanger and the refrigerant passing from the cooler through the first heat exchanger to exchange heat with each other.

[0029] For example, in the second heating mode, a section of the refrigerant line connecting the compressor and the condenser may be open. For example, a section of the refrigerant line connecting the condenser to the first end of the connecting line and a section of the refrigerant line connecting the compressor to the second end of the connecting line may be open. For example, a section of the refrigerant line connecting the evaporator to the first end of the connecting line and a section of the refrigerant line leading from the second end of the connecting line to the evaporator may be closed by the first expansion valve. For example, the connecting line may be open by the second expansion valve. For example, the first line may be open by the third expansion valve.For example, the second line can be open, and the first expansion valve can cease operation (e.g., be closed). For example, the second expansion valve can expand the refrigerant introduced through the connecting line and supply the expanded refrigerant to the cooler. For example, the third expansion valve can expand the refrigerant introduced through the first line and supply the expanded refrigerant through the first line to the heat exchanger.

[0030] For example, the first heat exchanger in the heat exchanger can allow the refrigerant passing from the condenser through the first heat exchanger and the refrigerant passing from the radiator through the first heat exchanger to exchange heat with each other. For example, the second heat exchanger in the heat exchanger can allow the refrigerant passing from the condenser through the second heat exchanger and the refrigerant passing from the third expansion valve through the second heat exchanger to exchange heat with each other, and can supply the gaseous refrigerant to the compressor via the open second line.

[0031] For example, the second and third expansion valves can be electronic 2-way expansion valves designed to selectively expand the refrigerant while controlling the flow rate (e.g., quantity and speed of the refrigerant passing through, e.g., its flow rate) of the supplied refrigerant.

[0032] For example, the heat pump system may also include a collector dryer that is provided on / in the refrigerant line between the condenser and the heat exchanger.

[0033] For example, the heat pump system may further comprise a battery module (e.g., a vehicle's traction battery) through which a first coolant circulates, and a heating device in which a second coolant circulates to heat the vehicle interior using a high-temperature coolant, wherein the condenser is connected to the heating device via a first coolant line along which the second coolant circulates, and wherein the radiator is connected to the battery module via a second coolant line along which the first coolant circulates.

[0034] For example, when heating the vehicle interior, the first coolant line may be open to connect the condenser and the heating device.

[0035] For example, if the battery module is to be cooled while the vehicle interior is being cooled, or if waste heat from the battery module is to be recovered when the vehicle interior is being heated, the second coolant line can be opened to connect the radiator and the battery module.

[0036] As described above, according to a heat pump system for a vehicle according to an embodiment of the present disclosure, the cooling and heating performance can be improved by selectively operating a gas injection device in an air conditioning mode of the vehicle interior to increase the flow rate of the refrigerant.

[0037] Furthermore, according to the present disclosure, the total number of components can be minimized by using a single heat exchanger for the entire system, which is designed to allow at least two refrigerants with different temperatures and conditions to exchange heat with each other, and the gas injection device.

[0038] Furthermore, according to the present disclosure, the performance of the system can be maximized using the gas injection device while reducing the required components, thereby achieving a rationalization and simplification of the system.

[0039] Furthermore, according to the present disclosure, it is possible to reduce manufacturing costs and weight and to improve the space utilization of a vehicle or a system for the vehicle by rationalizing the overall system. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a block diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure. Fig. Figure 2 is a schematic diagram of a heat exchanger used in a heat pump system for a vehicle according to an embodiment of the present disclosure. Fig. Figure 3 is an operating diagram according to a first cooling mode of the vehicle interior in a heat pump system for a vehicle according to an embodiment of the present disclosure. Fig. Figure 4 is an operating diagram of a heat exchanger according to a first cooling mode in the vehicle interior in a heat pump system for a vehicle according to an embodiment of the present disclosure. Fig. Figure 5 is an operating diagram according to a second cooling mode of the vehicle interior in a heat pump system for a vehicle according to an embodiment of the present disclosure. Fig. Figure 6 is an operating diagram of a heat exchanger according to a second cooling mode in the vehicle interior in a heat pump system for a vehicle according to an embodiment of the present disclosure. Fig. Figure 7 is an operating diagram according to a first heating mode of the vehicle interior in a heat pump system for a vehicle according to an embodiment of the present disclosure. Fig. Figure 8 is an operating diagram of a heat exchanger according to a first heating mode in the vehicle interior in a heat pump system for a vehicle according to an embodiment of the present disclosure. Fig. Figure 9 is an operating diagram according to a second heating mode of the vehicle interior in a heat pump system for a vehicle according to an embodiment of the present disclosure. Fig. Figure 10 is an operating diagram of a heat exchanger according to a second heating mode in the vehicle interior in a heat pump system for a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0041] The embodiments of the present disclosure in this description and the constructions shown in the drawings are only examples of the present disclosure and may not cover the entire scope of the present disclosure. Therefore, it should be understood that at the time of application of the technical concepts of this description, there may be various modifications and variations of the disclosed embodiments.

[0042] For the sake of clarity, parts not directly related to the description may have been omitted. Furthermore, identical elements or variations throughout the description are designated by the same reference symbols.

[0043] Furthermore, the size and thickness of the individual elements in the drawings may be arbitrarily represented, but the present disclosure is not necessarily limited to this. In the drawings, the thickness of layers, films, plates, areas, and the like may be exaggerated for clarity.

[0044] Unless expressly stated otherwise, the term "show" and variations such as "shows" or "showing" are to be understood as including the specified elements but not implying the exclusion of other elements.

[0045] Furthermore, terms such as "...unit," "...means," "...section," "...part," and "...element," used in the description, each denote a unit of an element that performs at least one function or operation. When a component, device, unit, module, controller, detector, element, or the like of this disclosure is described as having a purpose or performing an operation, function, or the like, the component, device, unit, module, controller, detector, or element should be considered here as "configured" to fulfill that purpose or perform that operation or function. This disclosure describes a controller and a data detector for a cooling system.The controller, detector, or other such components may be implemented separately or may be included as part of the controller or component with a processor and memory, such as a non-volatile, computer-readable medium.

[0046] Fig. Figure 1 is a block diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0047] According to a heat pump system for the vehicle according to an embodiment of the present disclosure, the cooling and heating performance can be improved by using a gas injection device 30, which is selectively operated in a selected air conditioning mode of a vehicle interior between cooling, heating or heating and dehumidifying a vehicle interior, to increase a flow rate of a refrigerant.

[0048] Furthermore, according to a heat pump system according to an embodiment of the present disclosure, the total number of components can be minimized by using a single heat exchanger 31 for the overall system, which is configured to allow at least two refrigerants with different temperatures and states to exchange heat with each other, and the gas injection device 30.

[0049] With reference to Fig. 1 The heat pump system can include a heating device 3 through which the coolant circulates to heat the vehicle interior using a high-temperature coolant, and a battery module 5 through which a coolant circulates.

[0050] Such a heat pump system can further comprise a compressor 10, a condenser 12, a first expansion valve 14, an evaporator 15, a cooler 20, a connecting line 21, a second expansion valve 23 and the gas injection device 30.

[0051] The heating device 3 can be connected to the condenser 12 via a first coolant line 2 through which the coolant circulates.

[0052] When heating the vehicle interior, the first coolant line 2 can be opened to connect the heating device 3 and the condenser 12 in order to supply the high-temperature coolant to the heating device 3.

[0053] Accordingly, the coolant, whose temperature is increased by heat exchange with the refrigerant in the condenser 12, can be supplied along the first coolant line 2 of the heating device 3.

[0054] The high-temperature coolant supplied to the heating device 3 can increase the temperature of the ambient air flowing through the heating device 3. In other words, the supplied ambient air can be brought to a high-temperature state as it flows through the heating device 3 and then directed into the vehicle interior, thereby heating the vehicle interior.

[0055] In one embodiment of the present disclosure, the battery module 5 can be connected to the cooler 20 via a second coolant line 4, along which the coolant circulates.

[0056] If the battery module 5 is to be cooled during the cooling of the vehicle interior, or if the waste heat from the battery module 5 is to be recovered at the time of heating the vehicle interior, the second coolant line 4 can be opened to connect the radiator 20 and the battery module 5.

[0057] A water pump (not shown) can be provided on the first coolant line 2 and the second coolant line 4, and the coolant can be selectively circulated by operating each water pump.

[0058] In one embodiment of the present disclosure, the compressor 10 can compress the supplied refrigerant and allow the compressed refrigerant to flow along the refrigerant line 11, so that the refrigerant circulates along a refrigerant line 11.

[0059] The condenser 12 can be connected to the compressor 10 via the refrigerant line 11. The condenser 12 can condense the supplied refrigerant by heat exchange with the coolant.

[0060] In other words, when heating the vehicle interior, the condenser 12 can condense the refrigerant supplied by the compressor 10 through heat exchange with the coolant supplied by the heating device 3 via the first coolant line 2.

[0061] In one embodiment of the present disclosure, the first expansion valve 14 can be connected to the condenser 12 via the refrigerant line 11. The first expansion valve 14 can selectively expand the supplied refrigerant.

[0062] The first expansion valve 14 can be configured as either a mechanical expansion valve designed to expand the supplied refrigerant or an electronic 2-way expansion valve designed to selectively expand the refrigerant by controlling the flow of the supplied refrigerant.

[0063] The evaporator 15 can be connected to the first expansion valve 14 via the refrigerant line 11. Additionally, the evaporator 15 can be connected to the compressor 10 via the refrigerant line 11. The evaporator 15 can evaporate the refrigerant supplied by the first expansion valve 14 by exchanging heat with the ambient air.

[0064] The evaporator 15 can be provided together with the heating device 3 in an HVAC module (heating, ventilation and air-conditioning module; not shown).

[0065] Accordingly, the ambient air flowing through the evaporator 15 can be cooled by a low-temperature refrigerant supplied to the evaporator 15 during its passage. The cooled ambient air can then be introduced into the vehicle interior, thus cooling the vehicle interior.

[0066] The heat pump system may also include a collector dryer 13.

[0067] The receiver-dryer 13 can be provided in the refrigerant line 11 between the condenser 12 and the first expansion valve 14. The receiver-dryer 13 can be provided in the refrigerant line 11 between the condenser 12 and the heat exchanger 31 described below.

[0068] The collector-dryer 13 can separate the gaseous refrigerant that remains in the liquid refrigerant condensed in the condenser 12.

[0069] In other words, the collector-dryer 13 can separate a gas component from the supplied refrigerant and filter out moisture and foreign matter to discharge only the liquid refrigerant.

[0070] In one embodiment of the present disclosure, the cooler 20 can adjust the temperature of the coolant, which is selectively supplied through the second coolant line 4, by heat exchange with the refrigerant supplied by the condenser 12.

[0071] In other words, the cooler 20 can be a water-cooled heat exchanger designed to allow the refrigerant introduced inside it to exchange heat with the coolant.

[0072] The cooler 20 can be connected to the refrigerant line 11 via the connecting line 21.

[0073] A first end of the connecting line 21 can be connected to the refrigerant line 11 between the condenser 12 and the first expansion valve 14.

[0074] Furthermore, a second end of the connecting line 21 between the evaporator 15 and the compressor 10 can be connected to the refrigerant line 11.

[0075] The cooler 20 can adjust the temperature of the coolant by heat exchange between the coolant selectively introduced into the evaporator 15 through the second coolant line 4 and the refrigerant selectively supplied from the condenser 12.

[0076] Accordingly, the coolant exchanged with the refrigerant in the radiator 20 can be selectively supplied to the battery module 5 in order to regulate the temperature of the battery module 5.

[0077] The cooler 20 thus configured can be arranged parallel to the evaporator 15 via the connecting line 21.

[0078] In one embodiment of the present disclosure, the second expansion valve 23 can be provided on / in the connecting line 21 at an upstream end of the cooler 20.

[0079] If the battery module 5 is to be cooled using the coolant heat exchanged with the refrigerant during the cooling of the vehicle interior, the second expansion valve 23 can expand the refrigerant introduced through the connecting line 21 and allow the expanded refrigerant to flow into the radiator 20.

[0080] In other words, if the battery module 5 is to be cooled during the cooling of the vehicle interior, the second expansion valve 23 can expand the refrigerant introduced through the connecting line 21 to lower its temperature and can allow the expanded refrigerant to flow into the radiator 20, thereby further lowering the temperature of the coolant flowing through the interior of the radiator 20.

[0081] Accordingly, the coolant, whose temperature has been reduced as it passes through the cooler 20, can be introduced into the battery module 5, thereby achieving more efficient cooling.

[0082] When heating the vehicle interior, if the waste heat generated by the battery module 5 is to be recovered, the second expansion valve 23 can expand the refrigerant introduced through the connecting line 21 and supply the expanded refrigerant to the cooler 20.

[0083] Accordingly, the cooler 20 can evaporate the refrigerant by heat exchange with the coolant supplied via the second coolant line 4.

[0084] The cooler 20 can recover the waste heat from the battery module 5, while the refrigerant supplied by the second expansion valve 23 exchanges heat with the coolant supplied by the battery module 5.

[0085] The second expansion valve 23 thus configured can be an electronic 2-way expansion valve configured to selectively expand the refrigerant while controlling the flow of the supplied refrigerant.

[0086] The upstream end of the cooler 20 can be determined based on the direction of refrigerant flow. Based on the direction in which the refrigerant flows along the connecting line 21, the point where the refrigerant is introduced into the cooler 20 can be defined as the upstream end of the cooler 20, and the point where the refrigerant is discharged from the cooler 20 can be defined as the downstream end of the cooler 20.

[0087] One embodiment of the present disclosure takes an example in which the cooler 20 is connected to the battery module 5 via the second coolant line 4, but is not limited thereto, and the cooler 20 may be connected to an electrical component (not shown) via a separate coolant line.

[0088] In one embodiment of the present disclosure, the heat exchanger 31 can be contained in or be part of the gas injection device 30. The heat exchanger 31 can be connected to the refrigerant line 11 that connects the condenser 12 and the first expansion valve 14, and to the refrigerant line 11 that connects the evaporator 15 and the compressor 10.

[0089] In other words, the heat exchanger 31 can allow the refrigerant supplied by the condenser 12 and the refrigerant supplied by at least one of the evaporators 15 and cooler 20 to exchange heat with each other.

[0090] A detailed structure of the heat exchanger 31 thus configured is described with reference to Fig. 2 described in detail.

[0091] Furthermore, the gas injection device 30 can include the heat exchanger 31 and be provided on the refrigerant line 11 between the condenser 12 and the first expansion valve 14.

[0092] The gas injection device 30 can expand the refrigerant selectively introduced from the condenser 12 and supply the expanded refrigerant to the heat exchanger 31 and supply the refrigerant exchanged in the heat exchanger 31 to the compressor 10 in order to increase the flow rate of the refrigerant circulating in the refrigerant line 11.

[0093] The gas injection device 30 thus configured can be operated selectively at the time of cooling or heating the vehicle interior.

[0094] The gas injection device 30 may further comprise a first line 32, a third expansion valve 33 and a second line 34.

[0095] One end of the first line 32 can be connected to the refrigerant line 11 between the condenser 12 and the heat exchanger 31. A second end of the first line 32 can be connected to the heat exchanger 31.

[0096] In one embodiment of the present disclosure, the third expansion valve 33 can be provided on the first line 32. The third expansion valve 33 can selectively expand the introduced refrigerant.

[0097] When operation of the gas injection device 30 is required, the third expansion valve 33 can expand the refrigerant supplied from the condenser 12 via the first line 32 and supply the expanded refrigerant to the heat exchanger 31.

[0098] The third expansion valve 33 thus configured can be an electronic 3-way expansion valve configured to selectively expand the refrigerant and control the flow (e.g. flow rate) of the refrigerant.

[0099] Additionally, one end of the second line 34 can be connected to the heat exchanger 31. The other end of the second line 34 can be connected to the compressor 10.

[0100] When the expanded refrigerant is fed to the heat exchanger 31, the second line 34 can convey the gaseous refrigerant from the heat exchanger 31 to the compressor 10.

[0101] In other words, the second line 34 can connect the heat exchanger 31 and the compressor 10 in such a way that the refrigerant evaporated by heat exchange in the heat exchanger 31 is selectively introduced into the compressor 10.

[0102] In the gas injection device 30 thus configured, the heat exchanger 31 can allow the refrigerant discharged from the condenser 12 and the refrigerant expanded in the third expansion valve 33 to exchange heat with each other.

[0103] When the refrigerant expanded in the third expansion valve 33 is supplied to the heat exchanger 31 via the first line 32, the heat exchanger 31 can evaporate the refrigerant supplied by the third expansion valve 33 by heat exchange with the refrigerant supplied by the condenser 12.

[0104] The refrigerant evaporated in the heat exchanger 31 can be supplied to the compressor 10 via the second line 34.

[0105] In short, the heat exchanger 31 can evaporate the expanded refrigerant by heat exchange with the refrigerant supplied by the condenser 12 and supply the evaporated refrigerant to the compressor 10 via the second line 34 in order to increase the flow rate of the refrigerant circulating in the refrigerant line 11.

[0106] In other words, the heat exchanger 31 can allow the refrigerant supplied by the condenser 12 and the refrigerant supplied by at least one of the evaporators 15 or coolers 20 to exchange heat with each other.

[0107] Furthermore, the heat exchanger 31 can allow the refrigerant supplied by the condenser 12 and the expanded refrigerant supplied by the third expansion valve 33 to exchange heat with each other through the operation of the gas injection device 30.

[0108] A detailed structure and connection structure of the heat exchanger 31 are described below with reference to Fig. 2 described in detail.

[0109] Fig. Figure 2 is a schematic diagram of a heat exchanger used in a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0110] With reference to Fig. 2 The heat exchanger 31 can have a first heat exchange device 31a, a second heat exchange device 31b and a barrier rib 31c.

[0111] To increase the degree of condensation by subcooling the refrigerant, the first heat exchanger 31a can allow the refrigerant (liquid high-temperature refrigerant) supplied by the condenser 12 via the refrigerant line 11 and the refrigerant (gaseous low-temperature refrigerant) supplied by one or all of the evaporators 15 or coolers 20 to exchange heat with each other.

[0112] Within the first heat exchanger 31a, several plates can be stacked in such a way that they alternately form fluid channels through which the refrigerant flows. Accordingly, the respective refrigerants can be brought into heat exchange with each other while flowing through different fluid channels.

[0113] The respective refrigerants can flow in opposite directions to each other inside the first heat exchanger device 31a.

[0114] In other words, the first heat exchanger 31a can allow the liquid high-temperature refrigerant introduced from the condenser 12 and the gaseous low-temperature refrigerant supplied from one or all evaporators 15 or the cooler 20 to exchange heat with each other by allowing them to flow in a counterflow arrangement.

[0115] Accordingly, the first heat exchanger device 31a can additionally allow the low-temperature refrigerant to exchange heat with a high-temperature refrigerant in order to further reduce the temperature of the refrigerant and increase the degree of condensation.

[0116] In this way, the first heat exchanger device 31a can further condense the refrigerant condensed in the condenser 12, thereby increasing the subcooling of the refrigerant and accordingly improving the coefficient of performance (COP), which is a coefficient of cooling capacity compared to required compressor power.

[0117] In one embodiment of the present disclosure, the second heat exchanger device 31b can allow the refrigerant (liquid high-temperature refrigerant) supplied by the condenser 12 through the refrigerant line 11 and the refrigerant (liquid and gaseous medium-temperature refrigerant) expanded in the third expansion valve 33 and supplied through the first line 32 to exchange heat with each other.

[0118] The majority of plates in the second heat exchanger 31b are stacked such that fluid lines, along which the high-temperature refrigerant and the medium-temperature refrigerant can flow, can be internally arranged alternately. Accordingly, the high-temperature refrigerant and the medium-temperature refrigerant can exchange heat with each other while flowing through different fluid lines.

[0119] The high-temperature refrigerant and the medium-temperature refrigerant can flow in opposite directions to each other inside the second heat exchanger device 31b.

[0120] In other words, the second heat exchanger device 31b can exchange heat between the high-temperature liquid refrigerant introduced from the condenser 12 and the two-phase medium-temperature refrigerant (which has both liquid and gas components) expanded in and supplied from the third expansion valve 33 by allowing them to flow in a counterflow arrangement.

[0121] Accordingly, when the gas injection device 30 is actuated, the second heat exchanger device 31b can evaporate the two-phase medium temperature refrigerant by heat exchange with the liquid high temperature refrigerant and supply the evaporated gaseous refrigerant to the compressor 10 via the second line 34.

[0122] Additionally, the barrier rib 31c can separate the first heat exchanger 31a and the second heat exchanger 31b from each other (e.g., separating flow paths with liquid and gaseous high-temperature refrigerant).

[0123] The barrier rib 31c can allow the refrigerant supplied from the condenser 12 to flow to the first heat exchanger 31a and to the second heat exchanger 31b, so that the refrigerant (liquid high-temperature refrigerant) supplied from the condenser 12 through the refrigerant line 11 can flow into the first heat exchanger 31a and the second heat exchanger 31b.

[0124] Furthermore, the barrier rib 31c can prevent the refrigerant supplied by at least one of the evaporators 15 and coolers 20 via the refrigerant line 11 to the first heat exchanger 31a from mixing with the refrigerant supplied by the third expansion valve 33 via the first line 32 to the second heat exchanger 31b.

[0125] The heat exchanger 31 thus configured can be a plate heat exchanger in which a plurality of plates are stacked to form the first heat exchange device 31a and the second heat exchange device 31b.

[0126] In one embodiment of the present disclosure, the flow of the refrigerant in the heat pump system can be controlled by an operating control of the gas injection device 30 depending on at least one mode for setting a temperature of a vehicle interior.

[0127] At least one mode can have a first cooling mode, a second cooling mode, a first heating mode, and a second heating mode.

[0128] In the first cooling mode, the gas injection device 30 does not need to be operated and the vehicle interior can be cooled.

[0129] In the second cooling mode, the gas injection device 30 can be operated and the vehicle interior can be cooled.

[0130] In the first cooling mode and in the second cooling mode, the battery module 5 can be selectively cooled.

[0131] In one embodiment of the present disclosure, in the first heating mode the gas injection device 30 does not need to be operated and the vehicle interior can be heated.

[0132] Additionally, in the second heating mode, the gas injection device 30 can be operated and the vehicle interior can be heated.

[0133] The following describes the operation and effect of a heat pump system for the vehicle according to an embodiment of the present disclosure, which is set up as described above, with reference to the Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 to Fig. 7 described in detail.

[0134] Operation in the first cooling mode, which serves to cool the battery module 5 while simultaneously cooling the vehicle interior and in which the gas injection device 30 is not operated with the refrigerant discharged from the heat exchanger 31, is described with reference to Fig. 3 and Fig. 4 described in detail.

[0135] Fig. 3 is an operating diagram according to the first cooling mode in a heat pump system for the vehicle according to an embodiment of the present disclosure, and Fig. Figure 4 is an operating diagram of a heat exchanger according to a first cooling mode in the vehicle interior in a heat pump system for the vehicle according to an embodiment of the present disclosure.

[0136] With reference to Fig. 3 In the first cooling mode, the refrigerant line 11, which connects the compressor 10, the condenser 12, the first expansion valve 14 and the evaporator 15, can be open.

[0137] The first line 32 can be closed by the third expansion valve 33. Additionally, the second line 34 can be closed. The operation of the third expansion valve 33 can be stopped.

[0138] In such a state, the refrigerant compressed in the compressor 10 can be introduced into the condenser 12 along the refrigerant line 11. The first refrigerant line 2 can be closed, so that no refrigerant is supplied to the heating device 3.

[0139] The condenser 12 can condense the refrigerant using the coolant supplied by a cooler (not shown) and an electrical component.

[0140] The refrigerant that has passed through the condenser 12 can be introduced along the refrigerant line 11 into the receiver-dryer 13. The receiver-dryer 13 can separate a gaseous component from the introduced refrigerant and filter out moisture and foreign matter to discharge only the liquid refrigerant.

[0141] The refrigerant discharged from the collector-dryer 13 can be fed to the heat exchanger 31 along the refrigerant line 11.

[0142] The refrigerant passed through the heat exchanger 31 can be introduced along the refrigerant line 11 into the first expansion valve 14. The first expansion valve 14 can expand the refrigerant supplied via the refrigerant line 11 and supply the expanded refrigerant to the evaporator 15.

[0143] In this state, the ambient air introduced into an HVAC module (not shown) can be cooled by the low-temperature refrigerant introduced into the evaporator 15 as it flows through the evaporator 15. The cooled ambient air can then cool the vehicle interior by being introduced directly into the vehicle interior.

[0144] Furthermore, the refrigerant that has flowed through the evaporator 15 can be introduced into the heat exchanger 31 along the refrigerant line 11. Afterwards, the refrigerant can flow through the heat exchanger 31 to be introduced into the compressor 10.

[0145] If cooling of the battery module 5 is required in the first cooling mode, the connecting line 21 can be / be opened by the second expansion valve 23.

[0146] A portion of the refrigerant that has been routed from the condenser 12 through the heat exchanger 31 can be introduced along the refrigerant line 11 into the first expansion valve 14.

[0147] Additionally, any remaining refrigerant that has flowed from the condenser 12 through the heat exchanger 31 can be introduced into the second expansion valve 23.

[0148] In other words, the refrigerant discharged from the heat exchanger 31 can be introduced along the refrigerant line 11 and the connecting line 21 into the first expansion valve 14 and the second expansion valve 23 respectively.

[0149] The second expansion valve 23 can expand the refrigerant supplied via the connecting line 21 and supply the expanded refrigerant to the cooler 20.

[0150] The refrigerant introduced into the radiator 20 can cool the coolant while exchanging heat with the coolant supplied from the battery module 5 via the second coolant line 4.

[0151] The coolant cooled in radiator 20 can be supplied to the battery module 5 along the second coolant line 4. Accordingly, the battery module 5 can be efficiently cooled by the coolant cooled in radiator 20.

[0152] In other words, the refrigerant circulating through the second refrigerant line 4 can efficiently cool the battery module 5 as the process described above is repeated. The refrigerant that has passed through the radiator 20 can be introduced into the heat exchanger 31 together with the refrigerant discharged from the evaporator 15. The refrigerant can then flow through the heat exchanger 31 to be introduced into the compressor 10.

[0153] As in Fig. As shown in Figure 4, the heat exchanger 31 can allow the refrigerant (liquid high-temperature refrigerant) flowing through the first heat exchanger device 31a from the condenser 12 and the refrigerant (gaseous low-temperature refrigerant) flowing through the first heat exchanger device 31a from the evaporator 15 and the cooler 20 to exchange heat with each other.

[0154] Accordingly, the refrigerant discharged from the condenser 12 can be further condensed in the heat exchanger 31 by heat exchange with the refrigerant supplied from the evaporator 15 and the cooler 20.

[0155] In other words, the heat exchanger 31 can be operated to increase the degree of condensation by increasing the subcooling of the refrigerant, as described above.

[0156] Accordingly, the heat exchanger 31 can subcool the refrigerant condensed in the condenser 12 and supply the subcooled refrigerant to the evaporator 15, so that the enthalpy difference of the evaporator 15 is large, thereby minimizing the cooling load.

[0157] Such operation allows the heat pump system to maximize the coefficient of performance (COP), which is a coefficient of cooling capacity compared to the required compressor power, and accordingly the overall cooling capacity and cooling efficiency can be improved compared to the conventional concept.

[0158] The refrigerant compressed in the compressor 10 can flow through the condenser 12 and then be fed along the refrigerant line 11 to the heat exchanger 31.

[0159] The heat pump system can repeatedly perform the processes described above.

[0160] During repeated execution of the process described above, the heat pump system can cool the vehicle interior more efficiently and improve the overall cooling performance and efficiency.

[0161] The heat pump system can efficiently cool the battery module 5 using a low-temperature refrigerant cooled in the cooler 20.

[0162] In one embodiment of the present disclosure, operation in the second cooling mode for cooling the vehicle interior, in which the gas injection device 30 is operated, is described with reference to Fig. 5 and Fig. 6 described in detail.

[0163] Fig. Figure 5 is an operating diagram according to the second cooling mode of the vehicle interior in a heat pump system for the vehicle according to an embodiment of the present disclosure, and Fig. Figure 6 is an operating diagram of a heat exchanger according to a second cooling mode of the vehicle interior in a heat pump system for the vehicle according to an embodiment of the present disclosure.

[0164] With reference to Fig. 5 In the second cooling mode, the refrigerant line 11, which connects the compressor 10, the condenser 12, the first expansion valve 14 and the evaporator 15, can be open.

[0165] The first line 32 can be opened by the third expansion valve 33. Additionally, the second line 34 can be open.

[0166] In such a state, the refrigerant compressed in the compressor 10 can be introduced into the condenser 12 along the refrigerant line 11. The first refrigerant line 2 can be closed, so that no refrigerant is supplied to the heating device 3.

[0167] The condenser 12 can condense the refrigerant using a coolant supplied by a radiator (not shown; e.g. outside air radiator, e.g. at the front of the vehicle) and an electrical component.

[0168] The refrigerant passing through the condenser 12 can be introduced into the receiver-dryer 13 along the refrigerant line 11. The receiver-dryer 13 can separate a gas component from the introduced refrigerant and filter out moisture and foreign matter to discharge only the liquid refrigerant.

[0169] A portion of the refrigerant discharged from the collector-dryer 13 can be introduced into the first line 32.

[0170] The third expansion valve 33 can expand the refrigerant supplied through the first line 32 and supply the expanded refrigerant to the heat exchanger 31 via the first line 32.

[0171] Any remaining refrigerant discharged from the collector-dryer 13 can be fed to the heat exchanger 31 along the refrigerant line 11.

[0172] The heat exchanger 31 can allow the refrigerant (liquid and gaseous medium temperature refrigerant) introduced from the third expansion valve 33 into the first line 32 and the refrigerant (liquid high temperature refrigerant) supplied from the condenser 12 to exchange heat with each other.

[0173] Accordingly, the heat exchanger 31 can evaporate the refrigerant supplied by the third expansion valve 33 by heat exchange with the refrigerant supplied by the condenser 12 and supply the evaporated gaseous refrigerant to the compressor 10 via the second line 34.

[0174] Through such a process, the gas injection device 30 can guide the gaseous refrigerant discharged from the heat exchanger 31 back to the compressor 10 via the second line 34, thereby increasing the flow rate of the refrigerant circulating in the refrigerant line 11.

[0175] The refrigerant introduced from the condenser 12 into the heat exchanger 31 can be further condensed by heat exchange with the refrigerant supplied via the first line 32.

[0176] The refrigerant additionally condensed in the heat exchanger 31 can be introduced along the refrigerant line 11 into the first expansion valve 14.

[0177] The first expansion valve 14 can expand the refrigerant introduced via the refrigerant line 11 and supply the expanded refrigerant to the evaporator 15.

[0178] In this state, the ambient air introduced into an HVAC module (not shown) can be cooled by the low-temperature refrigerant introduced into the evaporator 15 as it flows through the evaporator 15. The cooled ambient air can then cool the vehicle interior by being introduced directly into the vehicle interior.

[0179] Additionally, the refrigerant flowing through the evaporator 15 can be introduced into the heat exchanger 31 along the refrigerant line 11. Afterwards, the refrigerant can flow through the heat exchanger 31 to be introduced into the compressor 10.

[0180] If cooling of the battery module 5 is required in the second cooling mode, the connecting line 21 can be opened through the second expansion valve 23.

[0181] A portion of the refrigerant that has passed from the condenser 12 through the heat exchanger 31 can be directed along the refrigerant line 11 into the first expansion valve 14.

[0182] Additionally, any remaining refrigerant that has flowed from the condenser 12 through the heat exchanger 31 can be introduced into the second expansion valve 23.

[0183] In other words, the refrigerant discharged from the heat exchanger 31 can be introduced along the refrigerant line 11 and the connecting line 21 into the first expansion valve 14 and the second expansion valve 23 respectively.

[0184] The second expansion valve 23 can expand the refrigerant supplied through the connecting line 21 and supply the expanded refrigerant to the cooler 20.

[0185] The refrigerant introduced into the radiator 20 can cool the coolant while exchanging heat with the coolant supplied from the battery module 5 via the second coolant line 4.

[0186] The coolant cooled in radiator 20 can be supplied to the battery module 5 along the second coolant line 4. Accordingly, the battery module 5 can be efficiently cooled by the coolant cooled in radiator 20.

[0187] In other words, the coolant circulating through the second coolant line 4 can efficiently cool the battery module 5 while the process described above is repeated.

[0188] The refrigerant that has passed through the cooler 20 can be introduced into the heat exchanger 31 together with the refrigerant discharged from the evaporator 15. The refrigerant can then flow through the heat exchanger 31 to be introduced into the compressor 10.

[0189] As in Fig. As shown in Figure 6, the heat exchanger 31 can allow the refrigerant passing from the condenser 12 through the second heat exchange device 31b and the refrigerant passing from the third expansion valve 33 through the second heat exchange device 31b to exchange heat with each other.

[0190] In other words, the second heat exchanger device 31b can evaporate the refrigerant supplied by the third expansion valve 33 by heat exchange with the refrigerant supplied by the condenser 12 and supply the evaporated gaseous refrigerant to the compressor 10 via the second line 34.

[0191] The refrigerant flowing from the condenser 12 through the second heat exchanger 31b can be further condensed by heat exchange with the refrigerant supplied via the first line 32.

[0192] The heat exchanger 31 can allow the refrigerant (liquid high-temperature refrigerant) flowing through the first heat exchanger device 31a from the condenser 12 and the refrigerant (gaseous low-temperature refrigerant) flowing through the first heat exchanger device 31a from the evaporator 15 and the cooler 20 to exchange heat with each other.

[0193] Accordingly, the refrigerant discharged from the condenser 12 can be further condensed in the heat exchanger 31 by heat exchange with the refrigerant supplied by the evaporator 15 and the cooler 20.

[0194] The refrigerant introduced from the condenser 12 into the heat exchanger 31 can increase its degree of condensation, while it is additionally condensed in the first and second heat exchanger devices 31a and 31b respectively.

[0195] In other words, the heat exchanger 31 can be operated to increase the degree of condensation by increasing the subcooling of the refrigerant, as described above.

[0196] Accordingly, the heat exchanger 31 can subcool the refrigerant condensed in the condenser 12 and supply the subcooled refrigerant to the evaporator 15, which can result in a considerable enthalpy difference in the evaporator 15.

[0197] Such operation allows the heat pump system to maximize the coefficient of performance (COP), which is a coefficient of cooling capacity compared to the required compressor power, and accordingly the overall cooling capacity and cooling efficiency can be improved compared to the conventional concept.

[0198] The refrigerant compressed in the compressor 10 can pass through the condenser 12 and then be fed along the refrigerant line 11 to the heat exchanger 31.

[0199] The heat pump system can repeatedly perform the processes described above.

[0200] In other words, by repeatedly performing the process described above, the heat pump system can increase the flow rate of the refrigerant flowing along refrigerant line 11.

[0201] Furthermore, the heat exchanger 31 can allow the refrigerant supplied from the condenser 12 and the refrigerant supplied from the evaporator 15 and the cooler 20 to exchange heat with each other and can additionally allow heat to be exchanged with the refrigerant supplied from the third expansion valve 33, thereby further increasing the degree of condensation of the refrigerant.

[0202] In addition, the gas injection device 30 can control the flow of the refrigerant and can increase the degree of condensation of the refrigerant using the heat exchanger 31 to increase the degree of subcooling of the refrigerant discharged from the condenser 12.

[0203] If the degree of subcooling of the refrigerant discharged from the condenser 12 is increased, the enthalpy difference in the evaporator 15 can be significantly increased, thereby minimizing the cooling load.

[0204] In addition, the heat pump system can increase the flow rate of the refrigerant flowing along the refrigerant line 11, thereby improving the overall cooling capacity and efficiency.

[0205] The heat pump system can efficiently cool the battery module 5 by using the low-temperature refrigerant cooled in the cooler 20.

[0206] In one embodiment of the present disclosure, operation in the first heating mode, which serves to heat the vehicle interior and in which the gas injection device 30 is not operated, is described with reference to Fig. 7 and Fig. 8 described in detail.

[0207] Fig. 7 is an operating diagram according to the first heating mode of the vehicle interior in a heat pump system for the vehicle according to an embodiment of the present disclosure, and Fig. Figure 8 is an operating diagram of a heat exchanger according to a first heating mode in the vehicle interior in a heat pump system for the vehicle according to an embodiment of the present disclosure.

[0208] With reference to Fig. 7 In the first heating mode, a section of the refrigerant line 11, which connects the compressor 10 and the condenser 12, may be open.

[0209] The section of refrigerant line 11 that connects the condenser 12 to the first end of the connecting line 21, and the section of refrigerant line 11 that connects the second end of the connecting line 21 to the compressor 10, may be open.

[0210] The section of refrigerant line 11 that connects the evaporator 15 to the first end of the connecting line 21, and the section of refrigerant line 11 that connects the second end of the connecting line 21 to the evaporator 15, can be closed by the first expansion valve 14.

[0211] The connecting line 21 can be opened by the second expansion valve t 23.

[0212] The operation of the first expansion valve 14 may be stopped. Consequently, no refrigerant can be supplied to the evaporator 15.

[0213] The first line 32 can be closed by the third expansion valve 33. Additionally, the second line 34 can be closed. The operation of the third expansion valve 33 can be stopped.

[0214] In such a state, the refrigerant compressed in the compressor 10 can be introduced into the condenser 12 along the refrigerant line 11. The first refrigerant line 2 can be open, so that refrigerant is supplied to the heating device 3.

[0215] Accordingly, the refrigerant introduced into the condenser 12 can condense while exchanging heat with the coolant supplied by the heating device 3 via the first coolant line 2. The coolant, whose temperature is increased by the heat exchange with the refrigerant in the condenser 12, can then be supplied to the heating device 3.

[0216] The refrigerant passing through the condenser 12 can be introduced along the refrigerant line 11 into the receiver-dryer 13. The receiver-dryer 13 can separate a gas component from the introduced refrigerant and filter out moisture and foreign matter to discharge only the liquid refrigerant.

[0217] The refrigerant discharged from the collector-dryer 13 can be fed to the heat exchanger 31 along the refrigerant line 11.

[0218] The refrigerant that has passed through the heat exchanger 31 can be introduced into the second expansion valve 23 along a section of the refrigerant line 11 and the connecting line 21.

[0219] The second expansion valve 23 can expand the refrigerant introduced through the connecting line 21 and supply the expanded refrigerant to the cooler 20.

[0220] The refrigerant introduced into the radiator 20 can cool the coolant while exchanging heat with the coolant supplied from the battery module 5 via the second coolant line 4.

[0221] The coolant can increase its temperature by recovering waste heat from battery module 5 while cooling it. The coolant, whose temperature is increased by this process, can be supplied to radiator 20.

[0222] The cooler 20 can recover the waste heat from the battery module 5, while it exchanges heat between the coolant supplied by the battery module 5 via the second coolant line 4 and the refrigerant.

[0223] Furthermore, the refrigerant that has passed through the cooler 20 can be introduced into the heat exchanger 31 along the connecting line 21 and the open refrigerant line 11. Afterwards, the refrigerant can flow through the heat exchanger 31 to be introduced into the compressor 10.

[0224] As in Fig. As shown in Figure 8, the heat exchanger 31 can allow the refrigerant (liquid high-temperature refrigerant) flowing through the first heat exchanger device 31a from the condenser 12 and the refrigerant (gaseous low-temperature refrigerant) flowing through the first heat exchanger device 31a from the cooler 20 to exchange heat with each other.

[0225] Accordingly, the refrigerant discharged from the condenser 12 can additionally be condensed in the heat exchanger 31 by heat exchange with the refrigerant supplied by the cooler 20.

[0226] In other words, the heat exchanger 31 can further condense the refrigerant condensed in the condenser 12 in order to increase the degree of condensation of the refrigerant.

[0227] The refrigerant, whose condensation level has been increased, can be supplied to the cooler 20 after expansion through the second expansion valve 23 and can efficiently recover the waste heat from the battery module 5 while exchanging heat with the coolant supplied by the battery module 5 in the cooler 20.

[0228] The refrigerant compressed in the compressor 10 can flow through the condenser 12 and then be fed along the refrigerant line 11 to the heat exchanger 31.

[0229] The heat pump system can then repeat the processes described above.

[0230] The ambient air introduced into the vehicle interior can be brought to a high temperature state by heat exchange with the high-temperature coolant introduced into the heating device 3 and introduced into the vehicle interior, thereby heating the vehicle interior.

[0231] Accordingly, the refrigerant circulating in the heat pump system can smoothly recover the waste heat from the coolant, whose temperature is increased as it passes through the battery module 5, in the cooler 20, thereby improving the overall heating performance and efficiency.

[0232] Furthermore, according to the present disclosure, heating efficiency and heating output can be improved while minimizing the use of a separate electric heater.

[0233] Furthermore, the heat exchanger 31 can allow the refrigerant supplied by the cooler 20 and the refrigerant condensed in the condenser 12 to exchange heat with each other in order to further condense the condensed refrigerant and allow the additionally condensed refrigerant to flow, thereby increasing the degree of subcooling of the refrigerant discharged from the condenser 12.

[0234] While the waste heat generated by the battery module 5 or an electrical component (not shown) is insufficient, if the degree of subcooling of the refrigerant discharged from the condenser 12 is increased, the enthalpy difference in the cooler 20 can be increased to a significantly large value, and accordingly the waste heat can be recovered more smoothly and used to heat the vehicle interior.

[0235] Since the heat pump system can thus sufficiently recover and utilize the waste heat, the heating output and efficiency can be improved.

[0236] In one embodiment of the present disclosure, operation in the second heating mode for heating the vehicle interior, in which the gas injection device 30 is operated by the refrigerant discharged from the condenser 12, is described with reference to Fig. 9 and Fig. 10 described in detail.

[0237] Fig. 9 is an operating diagram according to the second heating mode of the vehicle interior in a heat pump system for the vehicle according to an embodiment of the present disclosure, and Fig. Figure 10 is an operating diagram of a heat exchanger according to a second heating mode in the vehicle interior in a heat pump system for the vehicle according to an embodiment of the present disclosure.

[0238] With reference to Fig. 9 In the second heating mode, the section of the refrigerant line 11 that connects the compressor 10 and the condenser 12 can be open.

[0239] The section of refrigerant line 11 that connects the condenser 12 to the first end of the connecting line 21, and the section of refrigerant line 11 that connects the second end of the connecting line 21 to the compressor 10, may be open.

[0240] The section of refrigerant line 11 that connects the evaporator 15 to the first end of the connecting line 21, and the section of refrigerant line 11 that connects the second end of the connecting line 21 to the evaporator 15, can be closed by the first expansion valve 14.

[0241] The connecting line 21 can be opened by the second expansion valve 23.

[0242] The operation of the first expansion valve 14 may be stopped. Consequently, no refrigerant can be supplied to the evaporator 15.

[0243] The first line 32 can be opened by the third expansion valve 33. Additionally, the second line 34 can be open.

[0244] In this state, the refrigerant compressed in the compressor 10 can be introduced into the condenser 12 along the refrigerant line 11. The first refrigerant line 2 can be open, allowing refrigerant to be supplied to the heating device 3.

[0245] Accordingly, the refrigerant introduced into the condenser 12 can condense while exchanging heat with the coolant supplied by the heating device 3 via the first coolant line 2. The coolant, whose temperature has been increased by the heat exchange with the refrigerant in the condenser 12, can then be supplied to the heating device 3.

[0246] The refrigerant flowing through the condenser 12 can be introduced along the refrigerant line 11 into the receiver-dryer 13. The receiver-dryer 13 can separate a gas component from the introduced refrigerant and filter out moisture and foreign matter to discharge only the liquid refrigerant.

[0247] A portion of the refrigerant discharged from the collector-dryer 13 can be introduced into the first line 32.

[0248] The third expansion valve 33 can expand the refrigerant supplied through the first line 32 and supply the expanded refrigerant to the heat exchanger 31 via the first line 32.

[0249] Any remaining refrigerant from the refrigerant discharged from the collector-dryer 13 can be fed to the heat exchanger 31 along the refrigerant line 11.

[0250] The heat exchanger 31 can allow the refrigerant (liquid and gaseous medium temperature refrigerant) introduced from the third expansion valve 33 into the first line 32 and the refrigerant (liquid high temperature refrigerant) supplied from the condenser 12 to exchange heat with each other.

[0251] Accordingly, the heat exchanger 31 can evaporate the refrigerant supplied by the third expansion valve 33 by heat exchange with the refrigerant supplied by the condenser 12 and supply the evaporated gaseous refrigerant to the compressor 10 via the second line 34.

[0252] Through such a process, the gas injection device 30 can direct the gaseous refrigerant discharged from the heat exchanger 31 back to the compressor 10 via the second line 34, thereby increasing the flow rate of the refrigerant circulating in the refrigerant line 11.

[0253] The refrigerant introduced from the condenser 12 into the heat exchanger 31 can be further condensed by heat exchange with the refrigerant supplied via the first line 32.

[0254] The refrigerant additionally condensed in the heat exchanger 31 can be introduced into the second expansion valve 23 along a section of the refrigerant line 11 and the connecting line 21.

[0255] The second expansion valve 23 can expand the refrigerant supplied via the connecting line 21 and supply the expanded refrigerant to the cooler 20.

[0256] The refrigerant introduced into the radiator 20 can cool the coolant while exchanging heat with the coolant supplied from the battery module 5 via the second coolant line 4.

[0257] The coolant can increase its temperature by recovering waste heat from battery module 5 while cooling it. The coolant, whose temperature is increased by this process, can be supplied to radiator 20.

[0258] The cooler 20 can recover the waste heat from the battery module 5, while it exchanges heat between the coolant supplied by the battery module 5 via the second coolant line 4 and the refrigerant.

[0259] Furthermore, the refrigerant that has passed through the cooler 20 can be introduced into the heat exchanger 31 along the connecting line 21 and the open refrigerant line 11. Subsequently, the refrigerant can flow through the heat exchanger 31 and be introduced into the compressor 10.

[0260] As in Fig.As shown in Figure 10, the heat exchanger 31 can allow the refrigerant passing from the condenser 12 through the second heat exchange device 31b and the refrigerant passing from the third expansion valve 33 through the second heat exchange device 31b to exchange heat with each other.

[0261] In other words, the second heat exchanger device 31b can evaporate the refrigerant supplied by the third expansion valve 33 by heat exchange with the refrigerant supplied by the condenser 12 and supply the evaporated gaseous refrigerant to the compressor 10 via the second line 34.

[0262] The refrigerant passing from the condenser 12 through the second heat exchanger 31b can additionally be condensed by heat exchange with the refrigerant supplied through the first line 32.

[0263] The heat exchanger 31 can bring the refrigerant (liquid high-temperature refrigerant) passing through the first heat exchanger device 31a from the condenser 12 and the refrigerant (gaseous low-temperature refrigerant) passing through the first heat exchanger device 31a from the cooler 20 into heat exchange with each other.

[0264] Accordingly, the refrigerant discharged from the condenser 12 can be further condensed in the heat exchanger 31 by heat exchange with the refrigerant supplied by the cooler 20.

[0265] The refrigerant introduced from the condenser 12 into the heat exchanger 31 can be further condensed in the first and second heat exchanger devices 31a and 31b, thereby increasing the degree of condensation.

[0266] The refrigerant, whose condensation level has been increased, can be supplied to the cooler 20 after expansion through the second expansion valve 23 and can efficiently recover the waste heat from the battery module 5 while exchanging heat with the coolant supplied from the battery module 5 to the cooler 20.

[0267] The refrigerant compressed in the compressor 10 can pass through the condenser 12 and then be fed along the refrigerant line 11 to the heat exchanger 31.

[0268] The heat pump system can repeatedly perform the processes described above.

[0269] The ambient air introduced into the vehicle interior can be brought to a high temperature state by heat exchange with the high-temperature coolant introduced into the heating device 3 and introduced into the vehicle interior, thereby heating the vehicle interior.

[0270] Accordingly, the refrigerant circulating in the heat pump system can smoothly recover the waste heat from the coolant, whose temperature is increased as it passes through the battery module 5, in the cooler 20, thereby improving the overall heating performance and efficiency.

[0271] Furthermore, according to the present disclosure, heating efficiency and performance can be improved while minimizing the use of a separate electric heater.

[0272] In other words, during repeated execution of the process described above, the heat pump system can increase the flow rate of the refrigerant flowing along refrigerant line 11, thus maximizing heating power.

[0273] In addition, the heat exchanger 31 can allow the refrigerant introduced from the condenser 12 and the refrigerant supplied from the cooler 20 to exchange heat with each other and can also exchange heat with the refrigerant supplied from the third expansion valve 33, thereby further increasing the degree of condensation of the refrigerant.

[0274] In addition, the gas injection device 30 can control the flow of the refrigerant and increase the degree of condensation of the refrigerant using the heat exchanger 31, thereby increasing the degree of subcooling of the refrigerant discharged from the condenser 12.

[0275] While the waste heat generated by the battery module 5 or an electrical component (not shown) is sufficient, if the degree of subcooling of the refrigerant discharged from the condenser 12 is increased, the enthalpy difference in the cooler 20 can be increased to a significantly large value, and accordingly the waste heat can be recovered more smoothly and used to heat the vehicle interior.

[0276] Since the heat pump system can thus sufficiently recover and utilize the waste heat, the heating output and efficiency can be improved.

[0277] As described above, according to a heat pump system for the vehicle according to an embodiment of the present disclosure, by using the single cooler 20 in which the coolant and the refrigerant exchange heat with each other, the waste heat of the battery module 5 can be recovered and the temperature of the battery module 5 can be adjusted depending on the climate control mode of the vehicle interior.

[0278] Furthermore, according to the present disclosure, the use of the gas injection device 30, which operates selectively in the selected air conditioning mode of the vehicle interior, can increase the refrigerant flow rate and improve cooling and heating performance.

[0279] Furthermore, according to the present disclosure, the total number of components can be minimized by using the single heat exchanger 31 for the overall system, which is designed to allow at least two refrigerants with different temperatures and conditions to exchange heat with each other, and the gas injection device 30.

[0280] Furthermore, according to the present disclosure, the performance of the system can be maximized by using the gas injection device 30 while simultaneously minimizing the number of components, thus enabling a rationalization and simplification of the system.

[0281] Furthermore, according to the present disclosure, the optimal performance of the battery module 5 can be achieved by efficiently adjusting the temperature of the battery module 5, and the total driving range of the vehicle can be increased by efficient management of the battery module 5.

[0282] Furthermore, according to the present disclosure, it is possible to reduce manufacturing costs and weight and to improve space utilization by rationalizing the entire system.

[0283] Although this disclosure has been described in connection with embodiments currently considered practical, it is to be understood that the disclosure is not limited to the disclosed embodiments. On the contrary, it is intended to include various modifications and equivalent arrangements that are contained within the meaning and scope of the appended claims. Reference symbol list 2 first coolant line 3 Heating device 4 second coolant line 5 battery module 10 Compressor 11 Refrigerant line 12 Capacitor 13 collector dryers 14 first expansion valve 15 evaporators 20 coolers (heat exchangers) 21 Connecting line 23 second expansion valve 30 Gas injection device 31 heat exchangers 31a first heat exchanger device 31b second heat exchanger device 32 first line 33 third expansion valve 34 second line

Claims

A heat pump system for a vehicle, the heat pump system comprising: a compressor (10) configured to compress a refrigerant; a condenser (12) connected to the compressor (10) via a refrigerant line (11), the condenser (12) being configured to condense the refrigerant; a first expansion valve (14) connected to the condenser (12) via the refrigerant line (11); an evaporator (15) connected to the first expansion valve (14) via the refrigerant line (11) and to the compressor (10) via the refrigerant line (11), the evaporator (15) being configured to evaporate the refrigerant supplied by the refrigerant line (11); and a connecting line (21) having a first end connected to the refrigerant line (11) between the condenser (12) and the first expansion valve (14), and a second end.a refrigerant line (11) between the compressor (10) and the evaporator (15), a cooler (20) provided on the connecting line (21) and configured to adjust the temperature of a coolant by heat exchange between the refrigerant introduced through the connecting line (21) and a selectively introduced coolant, a second expansion valve (23) provided on the connecting line (21) at an upstream end of the cooler (20), a heat exchanger (31) connected to the refrigerant line (11) connecting the condenser (12) and the first expansion valve (14), and to the refrigerant line (11) connecting the evaporator (15) and the compressor (10), and a gas injection device (30) comprising the heat exchanger (31) provided on the refrigerant line (11) between the condenser (12) and the first expansion valve (14),to expand the refrigerant selectively introduced from the condenser (12) and to supply the refrigerant expanded by the gas injection device (30) to the heat exchanger (31), and configured to supply the refrigerant heat-exchanged in the heat exchanger (31) to the compressor (10) in order to increase a flow rate of the refrigerant circulating in the refrigerant line (11), wherein the flow rate of the refrigerant is controlled by an operating control of the gas injection device (30) based on at least one mode for setting a temperature of a vehicle interior. Heat pump system according to claim 1, wherein the gas injection device (30) further comprises: a first line (32) with a first end connected to the refrigerant line (11) between the condenser (12) and the heat exchanger (31), and a second end connected to the heat exchanger (31), a third expansion valve (33) provided on the first line (32) at an upstream end of the heat exchanger (31), and a second line (34) with a first end connected to the heat exchanger (31) and a second end connected to the compressor (10). Heat pump system according to claim 2, wherein the heat exchanger (31) comprises: a first heat exchange device (31a) configured to exchange heat between the refrigerant supplied from the condenser (12) via the refrigerant line (11) and the refrigerant supplied from the evaporator (15) or the cooler (20), a second heat exchange device (31b) configured to exchange heat between the refrigerant supplied from the condenser (12) via the refrigerant line (11) and the refrigerant expanded in the third expansion valve (33) and supplied via the first line (32), and a barrier rib (31c) configured to separate the first heat exchange device (31a) and the second heat exchange device (31b) from each other. Heat pump system according to claim 3, wherein the barrier rib (31c) is configured to allow the refrigerant supplied from the condenser (12) to flow to the first heat exchanger (31a) and to the second heat exchanger (31b), so that the refrigerant supplied from the condenser (12) through the refrigerant line (11) flows together in the first heat exchanger (31a) and in the second heat exchanger (31b), and to prevent the refrigerant supplied from the evaporator (15) or from the cooler (20) via the refrigerant line (11) to the first heat exchanger (31a) from mixing with the refrigerant supplied from the third expansion valve (33) via the first line (32) to the second heat exchanger (31b). Heat pump system according to any one of claims 2 to 4, wherein, when the refrigerant expanded in the third expansion valve (33) is supplied to the heat exchanger (31) via the first line (32), the heat exchanger (31) is configured to evaporate the refrigerant supplied by the third expansion valve (33) by heat exchange with the refrigerant supplied by the condenser (12), so that the flow rate of the refrigerant circulating in the refrigerant line (11) is increased, and the heat exchanger (31) is configured to supply the evaporated refrigerant to the compressor (10) via the second line (34). Heat pump system according to any one of claims 2 to 5, wherein, when operation of the gas injection device (30) is required, the third expansion valve (33) is provided to expand the refrigerant supplied from the condenser (12) via the first line (32) and to supply the refrigerant expanded by the third expansion valve (33) to the heat exchanger (31). Heat pump system according to any one of claims 3 to 6, wherein the at least one mode comprises: a first cooling mode for cooling the vehicle interior, wherein the gas injection device (30) is not operated in the first cooling mode; a second cooling mode for cooling the vehicle interior, wherein the gas injection device (30) is operated in the second cooling mode; a first heating mode for heating the vehicle interior, wherein the gas injection device (30) is not operated in the first heating mode; and a second heating mode for heating the vehicle interior, wherein the gas injection device (30) is operated in the second heating mode. Heat pump system according to claim 7, wherein in the first cooling mode: the refrigerant line (11) connecting the compressor (10), the condenser (12), the first expansion valve (14) and the evaporator (15) is configured to be open, the first line (32) is configured to be closed by the third expansion valve (33), the second line (34) is configured to be closed, the first expansion valve (14) is configured to expand the refrigerant introduced through the refrigerant line (11) and to supply the refrigerant expanded by the first expansion valve (14) to the evaporator (15), the third expansion valve (33) is configured to stop operation, and the heat exchanger (31) is configured to transfer heat between the refrigerant passing from the condenser (12) through the first heat exchanger (31a) and the refrigerant,the heat that passes from the evaporator (15) through the first heat exchanger (31a) to allow heat to be exchanged. Heat pump system according to claim 8, wherein, when cooling of a battery module (5) is required in the first cooling mode: the connecting line (21) is configured to be open through the second expansion valve (23), the second expansion valve (23) is configured to expand the refrigerant introduced through the connecting line (21) and to supply the refrigerant expanded through the second expansion valve (23) to the cooler (20), and the refrigerant passing through the cooler (20) is configured to pass through the first heat exchanger device (31a) together with the refrigerant discharged from the evaporator (15). Heat pump system according to any one of claims 7 to 9, wherein in the second cooling mode: the refrigerant line (11) connecting the compressor (10), the condenser (12), the first expansion valve (14) and the evaporator (15) is configured to be open, the first line (32) is configured to be open by the third expansion valve (33), the second line (34) is configured to be open, the first expansion valve (14) is configured to expand the refrigerant introduced through the refrigerant line (11) and to supply the refrigerant expanded by the first expansion valve (14) to the evaporator (15), the third expansion valve (33) is configured to expand the refrigerant introduced through the first line (32) and to supply the refrigerant expanded by the third expansion valve (33) via the first line (32) to the heat exchanger (31),The first heat exchanger (31a) is arranged in the heat exchanger (31) to exchange heat between the refrigerant passing from the condenser (12) through the first heat exchanger (31a) and the refrigerant passing from the evaporator (15) through the first heat exchanger (31a), and the second heat exchanger (31b) is arranged in the heat exchanger (31) to exchange heat between the refrigerant passing from the condenser (12) through the second heat exchanger (31b) and the refrigerant passing from the third expansion valve (33) through the second heat exchanger (31b), and to supply the gaseous refrigerant to the compressor (10) via the open second line (34). Heat pump system according to claim 10, wherein, when cooling of a battery module (5) is required in the second cooling mode: the connecting line (21) is configured to be open through the second expansion valve (23), the second expansion valve (23) is configured to expand the refrigerant introduced through the connecting line (21) and to supply the refrigerant expanded through the second expansion valve (23) to the cooler (20), and the refrigerant passing through the cooler (20) is configured to pass through the first heat exchanger device (31a) together with the refrigerant discharged from the evaporator (15). Heat pump system according to any one of claims 7 to 11, wherein in the first heating mode: a section of the refrigerant line (11) connecting the compressor (10) and the condenser (12) is configured to be open, a section of the refrigerant line (11) connecting the condenser (12) to the first end of the connecting line (21), and a section of the refrigerant line (11) connecting the second end of the connecting line (21) to the compressor (10) are configured to be open, a section of the refrigerant line (11) connecting the evaporator (15) to the first end of the connecting line (21), and a section of the refrigerant line (11) connecting the second end of the connecting line (21) to the evaporator (15) are configured to be closed by the first expansion valve (14), the connecting line (21) is configured to be open by the second expansion valve (23).the first line (32) is configured to be closed by the third expansion valve (33), the second line (34) is configured to be closed, the first expansion valve (14) is configured to stop operation, the second expansion valve (23) is configured to expand the refrigerant introduced through the connecting line (21) and to supply the refrigerant expanded by the second expansion valve (23) to the cooler (20), the third expansion valve (33) is configured to stop operation, and the heat exchanger (31) is configured to exchange heat between the refrigerant passing from the condenser (12) through the first heat exchanger (31a) and the refrigerant flowing from the cooler (20) through the first heat exchanger (31a). Heat pump system according to any one of claims 7 to 12, wherein in the second heating mode: a section of the refrigerant line (11) connecting the compressor (10) and the condenser (12) is configured to be open, a section of the refrigerant line (11) connecting the condenser (12) to the first end of the connecting line (21), and a section of the refrigerant line (11) connecting the second end of the connecting line (21) to the compressor (10) are configured to be open, a section of the refrigerant line (11) connecting the evaporator (15) to the first end of the connecting line (21), and a section of the refrigerant line (11) connecting the second end of the connecting line (21) to the evaporator (15) are configured to be closed by the first expansion valve (14), the connecting line (21) is configured to be open by the second expansion valve (23).the first line (32) is configured to be open by the third expansion valve (33), the second line (34) is configured to be open, the first expansion valve (14) is configured to stop operation, the second expansion valve (23) is configured to expand the refrigerant introduced through the connecting line (21) and to supply the refrigerant expanded by the second expansion valve (23) to the cooler (20), the third expansion valve (33) is configured to expand the refrigerant introduced through the first line (32) and to supply the refrigerant expanded by the third expansion valve (33) via the first line (32) to the heat exchanger (31), the first heat exchange device (31a) in the heat exchanger (31) is configured to transfer heat between the refrigerant passing from the condenser (12) through the first heat exchange device (31a) and the refrigerant,the refrigerant passing from the condenser (20) through the first heat exchanger (31a), and the second heat exchanger (31b) is set up in the heat exchanger (31) to exchange heat between the refrigerant passing from the condenser (12) through the second heat exchanger (31b) and the refrigerant passing from the third expansion valve (33) through the second heat exchanger (31b), and to supply the gaseous refrigerant to the compressor (10) through the open second line (34). Heat pump system according to any one of claims 2 to 13, wherein the second expansion valve (23) and the third expansion valve (33) are electronic 2-way expansion valves configured to selectively expand the refrigerant while controlling the flow rate of the supplied refrigerant. Heat pump system according to any of the preceding claims, further comprising a collector-dryer (13) provided on the refrigerant line (11) between the condenser (12) and the heat exchanger (31). Heat pump system according to any of the preceding claims, further comprising a battery module (5) through which a first coolant circulates, and a heating device (3) in which a second coolant circulates to heat the vehicle interior using a high-temperature coolant, wherein the condenser (12) is connected to the heating device (3) via a first coolant line (2) through which the second coolant circulates, and wherein the radiator (20) is connected to the battery module (5) via a second coolant line (4) through which the first coolant circulates. Heat pump system according to claim 16, wherein when heating the vehicle interior the first coolant line (2) is arranged to be open in order to connect the condenser (12) and the heating device (3). Heat pump system according to claim 16 or 17, wherein, if the battery module (5) is to be cooled during the cooling of the vehicle interior or if waste heat from the battery module (5) is to be recovered at a time when the vehicle interior is being heated, the second coolant line (4) is provided to be open in order to connect the radiator (20) and the battery module (5).

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