Heat pump system for vehicle

Abstract

The present invention provides a heat pump system for a vehicle, which performs cooling or heating of a vehicle interior using a natural refrigerant, and effectively adjusts a temperature of a battery module using a single cooler that exchanges heat between the refrigerant and a coolant. A heat pump system for a vehicle includes: an air conditioning device including a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, and a fourth heat exchanger connected by a refrigerant line to circulate refrigerant through the refrigerant line; and a cooler configured to perform heat exchange between the refrigerant supplied from the air conditioning device and the coolant to adjust a temperature of the coolant. The air conditioning device further comprises a first control device, a second control device, a first connecting pipeline, a second connecting pipeline, a third control device and a third connecting pipeline.

Description

Technical Field

[0001] The present invention relates to a heat pump system for a vehicle, and more particularly, to a heat pump system for a vehicle capable of cooling or heating a vehicle interior using a natural refrigerant and effectively regulating the temperature of a battery module using a single cooler that performs heat exchange between the refrigerant and a coolant. Background Art

[0002] Generally, an air conditioning system for a vehicle includes an air conditioning device that circulates a refrigerant to heat or cool a cabin of the vehicle.

[0003] An air conditioning device that maintains the interior of a vehicle at an appropriate temperature regardless of changes in the outside temperature is configured to heat or cool the interior of the vehicle by using heat exchange between a condenser and an evaporator while refrigerant discharged by a compressor circulates back to the compressor through a condenser, a receiver-dryer, an expansion valve, and an evaporator.

[0004] In other words, in cooling mode, the air conditioning device reduces the temperature and humidity in the vehicle interior by condensing the high-temperature and high-pressure gas-phase refrigerant compressed from the compressor by the condenser, passing the refrigerant through the receiver-drier and the expansion valve, and then evaporating the refrigerant in the evaporator.

[0005] The development of environmentally friendly technologies for vehicles is likely to be a core technology for the future automotive industry. Premium car manufacturers have focused their efforts on the development of environmentally friendly vehicles that comply with environmental and fuel efficiency regulations.

[0006] Recently, with the increasing concern about energy efficiency and environmental pollution, there is a need to develop environmentally friendly vehicles that can substantially replace internal combustion engine vehicles. Environmentally friendly vehicles are divided into electric vehicles driven by using fuel cells or electricity as a power source and hybrid vehicles driven by using an engine and a battery.

[0007] Currently, electric vehicles are attracting much attention as a future means of transportation that can solve environmental and energy problems.

[0008] A heat pump system as an air conditioning device for adjusting the temperature inside the vehicle is applied to such an electric vehicle.

[0009] However, the refrigerants conventionally used in heat pump systems contain a large amount of environmentally restricted materials such as PFAS (perfluoroalkyl substances and polyfluoroalkyl substances). Therefore, it is necessary to develop a system that can control the indoor temperature of a vehicle using a new refrigerant or natural refrigerant that does not contain PFAS and flammability.

[0010] The above information disclosed in this Background section is provided only to enhance the understanding of the background of the present invention. Therefore, the Background section may contain information that does not constitute the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0011] The present invention is intended to provide a heat pump system for a vehicle that can cool or heat a vehicle interior using a natural refrigerant in accordance with environmental regulations. In addition, the present invention is intended to provide a heat pump system for a vehicle that can effectively adjust the temperature of a battery module using a single cooler that performs heat exchange between a refrigerant and a coolant.

[0012] In addition, the present invention intends to provide a heat pump system for a vehicle capable of maximizing cooling and heating performance by applying R744 refrigerant as a natural refrigerant using carbon dioxide and operating in a supercritical cycle in a state where the pressure and temperature of the refrigerant are higher than the critical pressure and temperature.

[0013] A heat pump system for a vehicle may include an air conditioning device having a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, and a fourth heat exchanger connected by a refrigerant line so that a refrigerant circulates through the refrigerant line. The heat pump system may also have a cooler configured to perform heat exchange between the refrigerant supplied from the air conditioning device and the coolant to adjust the temperature of the coolant. The air conditioning device may also include a first control device, which is arranged on the refrigerant line between the first heat exchanger and the second heat exchanger, and is configured to selectively supply the refrigerant that has passed through the first heat exchanger to the second heat exchanger or the fourth heat exchanger. The air conditioning device may also include a second control device, which is arranged on the refrigerant line between the third heat exchanger and the fourth heat exchanger, and is configured to selectively expand the refrigerant. The air conditioning device may also include a first connecting line, whose first end is connected to the second control device, whose second end is connected to the refrigerant line between the fourth heat exchanger and the compressor, and is provided with a cooler. The air conditioning device may also include a second connecting line, whose first end is connected to the first control device, and whose second end is connected to the refrigerant line between the fourth heat exchanger and the compressor. The air conditioning device may further include a third control device disposed on the refrigerant pipeline between the fourth heat exchanger and the compressor. The air conditioning device may further include a third connecting pipeline, a first end of which is connected to the third control device, and a second end of which is connected to the refrigerant pipeline between the first control device and the second heat exchanger.

[0014] The first control device may include: a first valve provided on the refrigerant line between the first heat exchanger and the second heat exchanger; and a second valve provided on the second connecting line.

[0015] The first valve and the second valve may be two-way valves.

[0016] The first control device may include a single first control valve provided at a portion where the refrigerant line between the first heat exchanger and the second heat exchanger and the second connecting line are connected.

[0017] The second control device may include a first expansion valve disposed on the refrigerant pipeline upstream of the fourth heat exchanger. The second control device may also include a second expansion valve disposed on the first connecting pipeline upstream of the cooler.

[0018] The third control device may include: a third valve provided on the refrigerant pipeline between the fourth heat exchanger and the compressor; and a fourth valve provided on the third connecting pipeline.

[0019] The third control device may include a single second control valve provided at a portion where the refrigerant line between the fourth heat exchanger and the compressor and the third connecting line are connected.

[0020] The air conditioning device may further include a fourth connecting line, a first end of which is connected to the refrigerant line between the first control device and the second heat exchanger, and a second end of which is connected to the refrigerant line between the second heat exchanger and the third heat exchanger. The air conditioning device may further include a fourth control device, which is disposed on the fourth connecting line and is configured to selectively open and close the fourth connecting line. The air conditioning device may further include a fifth control device, which is disposed on the refrigerant line between the second heat exchanger and the third heat exchanger. In addition, the air conditioning device may include a fifth connecting line, a first end of which is connected to the fifth control device, and a second end of which is connected to the refrigerant line between the third heat exchanger and the fourth heat exchanger.

[0021] The fourth control device may be a two-way valve.

[0022] The fifth control device may include: a fifth valve provided on the refrigerant line between the second heat exchanger and the third heat exchanger; and a sixth valve provided on the fifth connecting line.

[0023] The fifth control device may include a single third control valve provided at a portion where the refrigerant line between the second heat exchanger and the third heat exchanger and the fifth connecting line are connected.

[0024] In the cooling mode in the vehicle interior, the refrigerant line connecting the first heat exchanger and the second heat exchanger can be opened by the operation of the first control device. The refrigerant line connecting the second heat exchanger and the third heat exchanger can also be opened by the operation of the fifth control device. The refrigerant line connecting the fourth heat exchanger and the compressor can also be opened by the operation of the third control device. The second connecting line can also be closed by the operation of the first control device. The third connecting line can also be closed by the operation of the third control device. The fourth connecting line can also be closed by the operation of the fourth control device. The fifth connecting line can also be closed by the operation of the fifth control device.

[0025] In the cooling mode in the vehicle interior, when the battery module needs to be cooled, the first connecting line may be opened by operation of the second control device.

[0026] The second control device may be configured to expand the refrigerant introduced into the first connecting line and flow the expanded refrigerant to the cooler, so that the battery module can be cooled by the coolant after heat exchange with the refrigerant in the cooler.

[0027] The second control device may be configured to expand the refrigerant introduced into the fourth heat exchanger so that the expanded refrigerant may be introduced into the fourth heat exchanger.

[0028] In the heating mode in the vehicle interior, a portion of the refrigerant line connecting the first heat exchanger and the second heat exchanger can be closed by the operation of the first control device. The first connecting line can also be closed by the operation of the second control device. The second connecting line can also be opened by the operation of the first control device. A portion of the refrigerant line connecting the fourth heat exchanger and the third control device can also be closed by the operation of the third control device. The third connecting line can also be opened by the operation of the third control device. The fourth connecting line can also be opened by the operation of the fourth control device. The fifth connecting line can also be opened by the operation of the fifth control device. A portion of the refrigerant line connecting the third heat exchanger and the fifth control device can also be closed by the operation of the fifth control device.

[0029] The second control device may be configured to expand the refrigerant introduced from the fourth heat exchanger and flow the expanded refrigerant to the refrigerant line.

[0030] A portion of the refrigerant introduced into the refrigerant line from the second control device may be introduced into the second heat exchanger through the fifth connecting line. The remaining portion of the refrigerant introduced into the refrigerant line from the second control device may be introduced into the third heat exchanger along the refrigerant line. The refrigerant that has passed through the third heat exchanger may flow along the opened fourth connecting line.

[0031] The refrigerant exhausted from the second heat exchanger and the third heat exchanger may be supplied to the compressor along the opened third connecting line and the refrigerant line connecting the third control device and the compressor.

[0032] The second heat exchanger, the third heat exchanger, and the fourth heat exchanger may be configured to cool or evaporate the refrigerant according to selective operation of the second control device.

[0033] The refrigerant may be R744 refrigerant formed from carbon dioxide.

[0034] A liquid accumulator may be provided on the refrigerant pipeline between the fourth heat exchanger and the compressor. The first heat exchanger, the third heat exchanger, and the fourth heat exchanger may be air-cooled gas coolers configured to perform heat exchange between the refrigerant and the air. The second heat exchanger and the cooler may be water-cooled gas coolers configured to perform heat exchange between the refrigerant and the coolant.

[0035] The second heat exchanger may be connected to the electric component through a first line through which the coolant circulates, and the cooler may be connected to the battery module through a second line through which the coolant circulates.

[0036] As described above, by adopting the heat pump system for a vehicle according to the embodiment, since cooling or heating in the vehicle interior is performed using a natural refrigerant, it is possible to cope with environmental regulations and improve the overall marketability of the vehicle.

[0037] In addition, according to the present invention, by applying R744 refrigerant as a natural refrigerant using carbon dioxide, for cooling and heating in the vehicle interior, it is possible to maximize cooling and heating performance by operating in a supercritical region as a state where the pressure and temperature of the refrigerant are higher than the critical pressure and temperature.

[0038] Furthermore, according to the present invention, by effectively adjusting the temperature of the battery module according to the mode of the vehicle using a single cooler that performs heat exchange between a coolant and a refrigerant, it is possible to achieve downsizing and simplification of the system.

[0039] In addition, according to the embodiments, by effectively adjusting the temperature of the battery module, the battery module can be made to perform at its best performance, and the overall driving distance of the vehicle can be increased due to the effective management of the battery module.

[0040] Furthermore, according to the present invention, in a heating mode in a vehicle interior, since the refrigerant expands and branches to be supplied to each heat exchanger, the flow rate of the refrigerant can be easily controlled, the ambient air heat and the waste heat of the electrical components can be smoothly recovered, and the cooler for cooling the battery module can be optimally designed.

[0041] In addition, according to the embodiment, it is possible to reduce manufacturing cost and weight, and improve space utilization by simplifying the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a block diagram of a heat pump system for a vehicle according to an embodiment.

[0043] Figure 2 is a schematic diagram of a first control device of a heat pump system for a vehicle according to an embodiment.

[0044] Figure 3is a schematic diagram of another embodiment of a first control device for a heat pump system for a vehicle according to an embodiment.

[0045] Figure 4 is a schematic diagram of a second control device for a heat pump system for a vehicle according to an embodiment.

[0046] Figure 5 is a schematic diagram of a third control device of a heat pump system for a vehicle according to an embodiment.

[0047] Figure 6 is a schematic diagram of another embodiment of a third control device for a heat pump system for a vehicle according to an embodiment.

[0048] Figure 7 is a schematic diagram of a fifth control device of a heat pump system for a vehicle according to an embodiment.

[0049] Figure 8 is a schematic diagram of another embodiment of a fifth control device for a heat pump system for a vehicle according to an embodiment.

[0050] Fig. 9 is an operation diagram for cooling a battery module in a cooling mode within a vehicle cabin in a heat pump system for a vehicle according to an embodiment.

[0051] Fig.10 is an operation diagram according to a heating mode in a vehicle interior in a heat pump system for a vehicle according to an embodiment.

[0052] Description of Reference Numerals

[0053] 2, 4: First and second pipelines

[0054] 3: Electrical components

[0055] 5: Battery module

[0056] 10: Compressor

[0057] 11: Refrigerant pipeline

[0058] 12: HVAC module

[0059] 13, 14, 15, 16: first, second, third and fourth heat exchangers

[0060] 17: Liquid reservoir

[0061] 20: Cooler

[0062] 21: First connecting pipeline

[0063] 30: First control device

[0064] 31: Second connecting pipeline

[0065] 40: Second control device

[0066] 50: Third control device

[0067] 51: Third connecting pipeline

[0068] 60: Fourth control device

[0069] 61: Fourth connecting pipeline

[0070] 70: Fifth control device

[0071] 71: Fifth connecting pipeline. DETAILED DESCRIPTION

[0072] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

[0073] The embodiments disclosed in this specification and the configurations shown in the accompanying drawings are only some embodiments of the present invention and do not cover the entire scope of the present invention. Therefore, it should be understood that various equivalents and modifications may exist when the present application is filed.

[0074] In order to clarify the present invention, parts that are not related to the description have been omitted, and the same reference numerals are used throughout the specification to designate the same or equivalent elements.

[0075] In addition, the size and thickness of each element are arbitrarily shown in the drawings, but the present invention is not necessarily limited thereto. In addition, in the drawings, the thickness of layers, films, panels, regions, etc. are exaggerated for clarity.

[0076] In addition, unless explicitly described to the contrary, the term “comprise” and variations such as “comprising” or “including”, should be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0077] When a component, device, element, etc. of the present invention is described as having a purpose or performing an operation, function, etc., the component, device or element should be considered herein as being "configured to" satisfy the purpose or perform the operation or function.

[0078] Figure 1 is a block diagram of a heat pump system for a vehicle according to an embodiment. Figure 2 is a schematic diagram of a first control device of a heat pump system for a vehicle according to an embodiment. Figure 3 is a schematic diagram of another embodiment of a first control device for a heat pump system for a vehicle according to an embodiment.

[0079] Figure 4 is a schematic diagram of a second control device for a heat pump system for a vehicle according to an embodiment.

[0080] Figure 5is a schematic diagram of a third control device of a heat pump system for a vehicle according to an embodiment.

[0081] Figure 6 is a schematic diagram of another embodiment of a third control device for a heat pump system for a vehicle according to an embodiment. Figure 7 is a schematic diagram of a fifth control device of a heat pump system for a vehicle according to an embodiment. Figure 8 is a schematic diagram of another embodiment of a fifth control device for a heat pump system for a vehicle according to an embodiment.

[0082] The heat pump system for a vehicle according to the embodiment may perform cooling or heating in the vehicle interior using a natural refrigerant corresponding to environmental regulations, and effectively adjust the temperature of the battery module 5 using a single cooler 20 that performs heat exchange between the refrigerant and the coolant.

[0083] The refrigerant may be R744 refrigerant formed of carbon dioxide having an ozone depletion potential (ODP) of 0 and a global warming potential (GWP) of 1.

[0084] In other words, by applying R744 refrigerant which is a natural refrigerant using carbon dioxide, the heat pump system for a vehicle according to an embodiment can maximize cooling and heating performance by operating in a supercritical cycle, which is a state in which the pressure and temperature of the refrigerant are higher than the critical pressure and temperature.

[0085] To this end, the heat pump system according to the embodiment may include an air conditioning device and a chiller 20 .

[0086] Reference Figure 1 The air conditioning device includes a compressor 10, a first heat exchanger 13, a second heat exchanger 14, a third heat exchanger 15, and a fourth heat exchanger 16. The air conditioning device also includes a first connecting line 21, a first control device 30, a second connecting line 31, a second control device 40, a third connecting line 51, and a third control device 50. All components of the air conditioning device are connected through a refrigerant line 11 so that the refrigerant circulates through the refrigerant line 11.

[0087] First, the compressor 10 may compress refrigerant and make the refrigerant flow to the refrigerant line 11 so that the refrigerant may circulate through the refrigerant line 11 .

[0088] The first heat exchanger 13 may exchange heat between the refrigerant selectively supplied from the compressor 10 and the air.

[0089] The second heat exchanger 14 may be connected to the first heat exchanger 13 through the refrigerant line 11. Therefore, the refrigerant supplied to the refrigerant line 11 may pass through the second heat exchanger 14.

[0090] The second heat exchanger 14 may be connected to the electric component 3 through the first line 2 through which the coolant circulates.

[0091] The electric components 3 may include a power conversion device such as an electric power control unit (EPCU), a motor, an inverter, an on-board charger (OBC), an automatic driving controller, and the like.

[0092] The electric component 3 thus configured can be water-cooled by being connected to the first pipeline 2 .

[0093] In this embodiment, the third heat exchanger 15 may be connected to the second heat exchanger 14 through the refrigerant line 11. The third heat exchanger 15 is disposed on the front side (ie, the front side) of the vehicle and may cool or evaporate the refrigerant by exchanging heat with air introduced from the outside when the vehicle is traveling.

[0094] Since R744 refrigerant is a supercritical refrigerant and unlike typical refrigerants, does not undergo a phase change, it is referred to as a gas cooling refrigerant rather than a condensing refrigerant.

[0095] In addition, the second heat exchanger 14 may cool or evaporate the refrigerant by exchanging heat with the coolant supplied through the first line 2. The second heat exchanger 14 may be a water-cooled gas cooler that exchanges heat between the refrigerant introduced inside and the coolant.

[0096] In the present embodiment, the fourth heat exchanger 16 may be disposed on the refrigerant line 11 between the third heat exchanger 15 and the compressor 10 .

[0097] The first heat exchanger 13 , the third heat exchanger 15 , and the fourth heat exchanger 16 configured in this manner may be an air-cooling type gas cooler that exchanges heat between the refrigerant introduced into the interior and the air.

[0098] The first heat exchanger 13 and the fourth heat exchanger 16 may be disposed inside the HVAC module (heating, ventilation, and air conditioning module) 12 .

[0099] An opening and closing door (not shown) may be provided inside the HVAC module 12 between the first heat exchanger 13 and the fourth heat exchanger 16 so that air having passed through the fourth heat exchanger 16 may be selectively introduced into the first heat exchanger 13 .

[0100] In the heating mode in the vehicle interior, the open-close door is opened so that the air that has passed through the fourth heat exchanger 16 can be introduced into the first heat exchanger 13 .

[0101] In contrast, in the cooling mode in the vehicle interior, the opening and closing door closes a side (not shown) toward the first heat exchanger 13 so that air cooled while passing through the fourth heat exchanger 16 can be directly introduced into the vehicle interior.

[0102] In the present embodiment, an accumulator 17 may be provided on the refrigerant line 11 between the fourth heat exchanger 16 and the compressor 10 .

[0103] The accumulator 17 supplies only gaseous refrigerant to the compressor 10 , thereby improving efficiency and durability of the compressor 10 .

[0104] In addition, although not shown in the drawings, an internal heat exchanger may be provided inside the accumulator 17 .

[0105] The internal heat exchanger may heat-exchange the refrigerant cooled in the third heat exchanger 15 with the low-temperature refrigerant discharged from the fourth heat exchanger 16 , and may supply the heat-exchanged refrigerant to the compressor 10 and the fourth heat exchanger 16 , respectively.

[0106] In the present embodiment, the cooler 20 may be connected to the battery module 5 through the second line 4 through which the coolant circulates. Therefore, the coolant may be selectively circulated through the cooler 20.

[0107] The cooler 20 may perform heat exchange between the refrigerant supplied from the air conditioner and the coolant, thereby adjusting the temperature of the coolant. In other words, the cooler 20 may be a water-cooled gas cooler that performs heat exchange between the refrigerant introduced into the inside and the coolant.

[0108] The cooler 20 may be connected to the refrigerant line 11 through a first connecting line 21 .

[0109] In this embodiment, the first control device 30 may be disposed on the refrigerant line 11 between the first heat exchanger 13 and the second heat exchanger 14 so that the refrigerant having passed through the first heat exchanger 13 may be selectively supplied to the second heat exchanger 14 or the fourth heat exchanger 16 .

[0110] The second control device 40 may be disposed on the refrigerant line 11 between the third heat exchanger 15 and the fourth heat exchanger 16. The second control device 40 may selectively expand the introduced refrigerant.

[0111] A first end of the first connecting line 21 is connected to the second control device 40. A second end of the first connecting line 21 is connected to the refrigerant line 11 between the fourth heat exchanger 16 and the compressor 10.

[0112] The cooler 20 configured in this way may be disposed on the first connecting line 21. In other words, the cooler 20 may be connected to the second control device 40 through the first connecting line 21.

[0113] In the present embodiment, a first end of the second connecting line 31 is connected to the first control device 30. A second end of the second connecting line 31 may be connected to the refrigerant line 11 between the fourth heat exchanger 16 and the compressor 10.

[0114] like Figure 2 As shown, the first control device 30 may include a first valve 32 and a second valve 34 .

[0115] First, the first valve 32 is provided on the refrigerant line 11 between the first heat exchanger 13 and the second heat exchanger 14 .

[0116] Furthermore, a second valve 34 may be provided on the second connecting line 31 .

[0117] The first valve 32 and the second valve 34 thus configured may be two-way valves that control opening and closing of the refrigerant line 11 and the second connecting line 31 .

[0118] In the cooling mode in the vehicle interior, the first control device 30 may flow the refrigerant supplied from the first heat exchanger 13 to the second heat exchanger 14 .

[0119] On the other hand, in the heating mode in the vehicle interior, the first control device 30 may supply the refrigerant introduced through the refrigerant line 11 to the fourth heat exchanger 16 through the second connecting line 31 .

[0120] In this embodiment, the first control device 30 is composed of two two-way valves, but is not limited thereto. Figure 3 The first control device 30 according to another embodiment is described.

[0121] Reference Figure 3 , the first control device 30 according to another embodiment may include a first control valve 132 provided at a portion where the refrigerant line 11 between the first heat exchanger 13 and the second heat exchanger 14 and the second connection line 31 are connected.

[0122] The first control valve 132 can selectively connect the refrigerant pipeline 11 and the second connection pipeline 31 , and can control the flow direction and flow rate of the refrigerant.

[0123] In other words, the first control device 30 according to another embodiment applies the first control valve 132 constituted by a three-way valve. This embodiment of the first control device 30 can not only reduce the number of valves but also perform the same operation as the above-mentioned embodiment.

[0124] In the present embodiment, the upstream of the fourth heat exchanger 16 , the downstream of the fourth heat exchanger 16 , the upstream of the cooler 20 , and the downstream of the cooler 20 may be set based on the flow direction of the refrigerant.

[0125] In the vehicle interior cooling mode (see Fig. 9 ), based on the direction in which the refrigerant flows along the refrigerant line 11, the position where the refrigerant is introduced into the fourth heat exchanger 16 may be defined as the upstream of the fourth heat exchanger 16. Also, the position where the refrigerant is discharged from the fourth heat exchanger 16 may be defined as the downstream of the fourth heat exchanger 16.

[0126] In addition, based on the direction in which the refrigerant flows along the first connecting line 21, the position where the refrigerant is introduced into the cooler 20 may be defined as the upstream of the cooler 20. Also, the position where the refrigerant is discharged from the cooler 20 may be defined as the downstream of the cooler 20.

[0127] In this embodiment, if Figure 4 As shown, the second control device 40 may include a first expansion valve 42 and a second expansion valve 44 .

[0128] First, the first expansion valve 42 is provided on the refrigerant line 11 upstream of the fourth heat exchanger 16. Furthermore, the second expansion valve 44 is provided on the first connecting line 21 upstream of the cooler 20.

[0129] The second control device 40 thus configured can selectively expand the refrigerant introduced through the refrigerant line 11 .

[0130] In addition, the second control device 40 may supply refrigerant to the fourth heat exchanger 16 , the cooler 20 , or both through the refrigerant line 11 and the first connecting line 21 .

[0131] In other words, the second control device 40 may selectively expand the refrigerant while controlling the flow of the refrigerant.

[0132] Therefore, the cooler 20 may heat-exchange the coolant selectively introduced through the second line 4 with the refrigerant selectively supplied from the air-conditioning device. Thus, the cooler 20 may adjust the temperature of the coolant.

[0133] The coolant after heat exchange in the cooler 20 may circulate in the battery module 5 through the second line 4 .

[0134] Water pumps (not shown) may be provided on the first pipeline 2 and the second pipeline 4 .

[0135] In other words, the coolant may circulate in the first line 2 and the second line 4 according to the operation of each water pump (not shown).

[0136] Therefore, the coolant, which has undergone heat exchange with the refrigerant in the second heat exchanger 14 and the cooler 20 , may adjust the temperatures of the electric components 3 and the battery module 5 by being selectively supplied to the electric components 3 and the battery module 5 .

[0137] The second control device 40 may selectively expand the introduced refrigerant and introduce the expanded refrigerant into the cooler 20 through the first connecting line 21 according to a cooling mode or a heating mode in the vehicle cabin.

[0138] In addition, the second control device 40 may supply the introduced refrigerant to the cooler 20 through the first connecting line 21 without expansion, or close the first connecting line 21 so that the refrigerant may not be supplied to the cooler 20 .

[0139] In more detail, when the battery module 5 is cooled using the coolant heat-exchanged with the refrigerant in the cooler 20 , the second control device 40 may open the first connecting line 21 .

[0140] At the same time, the second control device 40 may expand the introduced refrigerant, and the expanded refrigerant may flow to the cooler 20 through the first connecting line 21 .

[0141] In other words, in the cooling mode in the vehicle interior, the second control device 40 can expand the refrigerant discharged from the third heat exchanger 15 to reduce its temperature, and make the expanded refrigerant flow to the cooler 20, thereby further reducing the temperature of the coolant passing through the inside of the cooler 20.

[0142] Therefore, the battery module 5 can be cooled more efficiently by the flowing coolant that passes through the cooler 20 to be cooled.

[0143] Furthermore, in the cooling mode in the vehicle interior, the second control device 40 may expand the introduced refrigerant and may make the expanded refrigerant flow to the fourth heat exchanger 16 through the refrigerant line 11 .

[0144] In contrast, in the heating mode in the vehicle interior, the second control device 40 may expand the refrigerant introduced from the fourth heat exchanger 16 and may flow the expanded refrigerant to the second heat exchanger 14 or the third heat exchanger 15 through the refrigerant line 11 .

[0145] In the present embodiment, the third control device 50 may be disposed on the refrigerant line 11 between the fourth heat exchanger 16 and the compressor 10 .

[0146] In addition, a first end of the third connecting line 51 is connected to the third control device 50. A second end of the third connecting line 51 may be connected to the refrigerant line 11 between the first control device 30 and the second heat exchanger 14.

[0147] like Figure 5 As shown, the third control device 50 may include a third valve 52 and a fourth valve 54 .

[0148] First, the third valve 52 is provided on the refrigerant line 11 between the fourth heat exchanger 16 and the compressor 10 .

[0149] In addition, a fourth valve 54 may be provided on the third connecting line 51. The fourth valve 54 may control opening and closing of the third connecting line 51.

[0150] The third valve 52 and the fourth valve 54 configured as such may be two-way valves that control opening and closing of the refrigerant line 11 and the third connecting line 51 .

[0151] In the vehicle interior cooling mode (see Fig. 9 ), the third control device 50 can close the third connecting pipeline 51 and can open the refrigerant pipeline 11 connected to the accumulator 17.

[0152] In contrast, in the vehicle interior heating mode (see Fig.10 ), the third control device 50 can close the refrigerant pipeline 11 connected to the fourth heat exchanger 16, and can open the third connecting pipeline 51.

[0153] In this embodiment, the third control device 50 is composed of two two-way valves, but is not limited thereto. Figure 6 A third control device 50 according to another embodiment will be described.

[0154] Reference Figure 6 , the third control device 50 according to another embodiment may include a second control valve 152 provided at a portion where the refrigerant line 11 between the fourth heat exchanger 16 and the compressor 10 and the third connection line 51 are connected.

[0155] The second control valve 152 can selectively connect the refrigerant pipeline 11 and the third connection pipeline 51 , and can control the flow direction and flow rate of the refrigerant.

[0156] In other words, the third control device 50 according to another embodiment applies the second control valve 152 constituted by a three-way valve. This embodiment of the third control device 50 can not only reduce the number of valves but also perform the same operation as the above-mentioned embodiment.

[0157] The air conditioning device may further include a fourth control device 60 , a fourth connecting line 61 , a fifth control device 70 , and a fifth connecting line 71 .

[0158] First, the fourth control device 60 is provided on the fourth connecting line 61 so as to selectively open and close the fourth connecting line 61. The fourth control device 60 may be a two-way valve that controls the opening and closing of the fourth connecting line 61.

[0159] In this embodiment, a first end of the fourth connecting line 61 is connected to the refrigerant line 11 between the first control device 30 and the second heat exchanger 14. A second end of the fourth connecting line 61 may be connected to the refrigerant line 11 between the second heat exchanger 14 and the third heat exchanger 15.

[0160] The fourth control device 60 thus configured can selectively open and close the fourth connecting line 61 according to a cooling mode or a heating mode in the vehicle interior.

[0161] In more detail, in the cooling mode in the vehicle interior, the fourth control device 60 may close the fourth connecting line 61. Conversely, in the heating mode in the vehicle interior, the fourth control device 60 may open the fourth connecting line 61.

[0162] In other words, in the heating mode in the vehicle interior, the fourth connecting line 61 is opened by the operation of the fourth control device 60 so that the refrigerant exhausted from the third heat exchanger 15 can flow.

[0163] In the present embodiment, the fifth control device 70 is disposed on the refrigerant line 11 between the second heat exchanger 14 and the third heat exchanger 15 .

[0164] In addition, a first end of the fifth connecting line 71 is connected to the fifth control device 70. A second end of the fifth connecting line 71 may be connected to the refrigerant line 11 between the third heat exchanger 15 and the fourth heat exchanger 16.

[0165] In more detail, the second end of the fifth connecting line 71 is connected to the refrigerant line 11 between the third heat exchanger 15 and the second control device 40 .

[0166] like Figure 7 As shown, the fifth control device 70 may include a fifth valve 72 and a sixth valve 74 .

[0167] First, the fifth valve 72 is provided on the refrigerant line 11 between the second heat exchanger 14 and the third heat exchanger 15 .

[0168] In addition, a sixth valve 74 may be provided on the fifth connecting line 71 .

[0169] In other words, the fifth valve 72 and the sixth valve 74 may be two-way valves that control opening and closing of the refrigerant line 11 and the fifth connecting line 71 .

[0170] The fifth control device 70 configured in this way can selectively open and close the refrigerant line 11 connected to the third heat exchanger 15 and the fifth connecting line 71 according to the cooling mode or the heating mode in the vehicle interior.

[0171] In more detail, in the cooling mode in the vehicle interior (see Fig. 9), the fifth control device 70 may close the fifth connecting line 71. At the same time, the fifth control device 70 may open the refrigerant line 11 connecting the second heat exchanger 14 and the third heat exchanger 15.

[0172] In contrast, in the vehicle interior heating mode (see Fig.10 ), the fifth control device 70 may open the fifth connecting line 71. At the same time, the fifth control device 70 may close the refrigerant line 11 connected to the third heat exchanger 15.

[0173] In this embodiment, the fifth control device 70 is composed of two two-way valves, but is not limited thereto. Figure 8 A fifth control device 70 according to another embodiment will be described.

[0174] Reference Figure 8 The fifth control device 70 according to another embodiment may include a third control valve 172 provided at a portion where the refrigerant line 11 between the second heat exchanger 14 and the third heat exchanger 15 and the fifth connection line 71 are connected.

[0175] The third control valve 172 can selectively connect the refrigerant pipeline 11 and the fifth connection pipeline 71 , and can control the flow direction and flow rate of the refrigerant.

[0176] In other words, the fifth control device 70 according to another embodiment applies the third control valve 172 constituted by a three-way valve. This embodiment of the fifth control device 70 can not only reduce the number of valves but also perform the same operation as the above-mentioned embodiment.

[0177] In the heat pump system thus configured, the second heat exchanger 14 , the third heat exchanger 15 , and the fourth heat exchanger 16 may cool or evaporate the introduced refrigerant according to the selective operation of the second control device 40 .

[0178] In other words, the second heat exchanger 14 , the third heat exchanger 15 , and the fourth heat exchanger 16 may evaporate the refrigerant when the expanded refrigerant is introduced, and cool the refrigerant when the unexpanded refrigerant is introduced.

[0179] In the following, reference is made to Fig. 9 and Fig.10 The operation and effect of the heat pump system for a vehicle according to the embodiment configured as described above will be described in detail.

[0180] First, refer to Fig. 9 The operation for cooling the battery module 5 in the cooling mode in the vehicle compartment is described.

[0181] Fig. 9 is an operation diagram for cooling a battery module in a cooling mode within a vehicle cabin in a heat pump system for a vehicle according to an embodiment.

[0182] Reference Fig. 9 , the coolant may be circulated through the first pipeline 2 by operation of a water pump (not shown).

[0183] Therefore, the coolant having passed through the electric component 3 may be supplied to the second heat exchanger 14 along the first line 2 .

[0184] Each component in the air conditioning device operates to cool the interior of the vehicle. Therefore, the refrigerant circulates along the refrigerant line 11 .

[0185] The refrigerant line 11 connecting the first heat exchanger 13 and the second heat exchanger 14 is opened by the operation of the first control device 30 .

[0186] The refrigerant line 11 connecting the second heat exchanger 14 and the third heat exchanger 15 is opened by the operation of the fifth control device 70 .

[0187] In addition, the refrigerant line 11 connecting the fourth heat exchanger 16 and the compressor 10 may be opened by the operation of the third control device 50 .

[0188] At the same time, the second connecting line 31 is closed by the operation of the first control device 30. In addition, the third connecting line 51 is closed by the operation of the third control device 50.

[0189] The fourth connecting line 61 is closed by the operation of the fourth control device 60. In addition, the fifth connecting line 71 is closed by the operation of the fifth control device 70.

[0190] For cooling of the battery module 5 , the first connecting line 21 is opened by actuation of the second control device 40 .

[0191] The coolant may be circulated through the second line 4 by operation of a water pump (not shown). Therefore, the coolant having passed through the battery module 5 may be supplied to the cooler 20 along the second line 4.

[0192] To cool the battery module 5 using the coolant heat-exchanging with the refrigerant in the cooler 20, the second control device 40 may expand the refrigerant and flow the expanded refrigerant to the first connecting line 21. The expanded refrigerant may be introduced into the cooler 20 along the first connecting line 21.

[0193] Therefore, the coolant having passed through the cooler 20 may be cooled by heat-exchanging with the expanded refrigerant introduced from the second control device 40 and supplied to the cooler 20 .

[0194] In other words, the coolant passing through the cooler 20 is cooled by heat exchange with the expanded refrigerant supplied to the cooler 20. The coolant cooled in the cooler 20 is supplied to the battery module 5 along the second line 4. Therefore, the battery module 5 can be effectively cooled by the coolant cooled in the cooler 20.

[0195] The refrigerant supplied from the compressor 10 may sequentially pass through the first heat exchanger 13 , the second heat exchanger 14 , and the third heat exchanger 15 along the refrigerant line 11 .

[0196] The first heat exchanger 13 primarily cools the refrigerant by exchanging heat between the air introduced into the HVAC module 12 and the refrigerant. The refrigerant primarily cooled in the first heat exchanger 13 is supplied to the second heat exchanger 14 along the refrigerant line 11.

[0197] The second heat exchanger 14 may secondary cool the refrigerant using the coolant flowing along the first line 2 .

[0198] In addition, the third heat exchanger 15 may further cool the refrigerant introduced from the second heat exchanger 14 through heat exchange with the air.

[0199] The refrigerant having sequentially passed through the first, second, and third heat exchangers 13 , 14 , 15 may circulate along the first connecting line 21 and the opened refrigerant line 11 .

[0200] The second control device 40 may expand the refrigerant introduced into the fourth heat exchanger 16 so that the expanded refrigerant may flow into the fourth heat exchanger 16 .

[0201] In other words, the second control device 40 expands the refrigerant introduced into the first connecting line 21 among the refrigerant having passed through the third heat exchanger 15 so that the expanded refrigerant can be supplied to the cooler 20. In addition, the second control device 40 expands the refrigerant introduced into the refrigerant line 11 among the refrigerant having passed through the third heat exchanger 15 so that the expanded refrigerant can be supplied to the fourth heat exchanger 16.

[0202] Therefore, the refrigerant introduced into the first connecting line 21 is expanded by the operation of the second control device 40 to be in a low-temperature and low-pressure state, and is introduced into the cooler 20 provided on the first connecting line 21 .

[0203] Then, the refrigerant introduced into the cooler 20 exchanges heat with the coolant supplied through the second line 4 , passes through the accumulator 17 along the refrigerant line 11 connected to the first connecting line 21 , and then flows to the compressor 10 .

[0204] The remaining refrigerant discharged from the third heat exchanger 15 flows along the refrigerant line 11 to cool the vehicle interior. The remaining refrigerant passes through the second control device 40, the fourth heat exchanger 16, the third control device 50, the accumulator 17, and then is introduced into the compressor 10.

[0205] The air introduced into the HVAC module 12 is cooled by the refrigerant in a low temperature state introduced into the fourth heat exchanger 16 while passing through the fourth heat exchanger 16 .

[0206] The opening and closing door (not shown) closes a portion facing the first heat exchanger 13 so that the cooled air may not pass through the first heat exchanger 13. Therefore, the cooled air can cool the vehicle interior by being directly introduced into the vehicle interior.

[0207] The refrigerant, whose cooling level has been increased while sequentially passing through the first, second, and third heat exchangers 13 , 14 , 15 , is expanded and supplied to the fourth heat exchanger 16 , and thus, the refrigerant may be evaporated at a lower temperature.

[0208] In other words, in this embodiment, the first heat exchanger 13 and the third heat exchanger 15 cool the refrigerant by exchanging heat with the air, and the second heat exchanger 14 cools the refrigerant by exchanging heat with the coolant, thereby more effectively cooling the R744 refrigerant formed of carbon dioxide. Therefore, this configuration is advantageous for forming supercooling of the refrigerant.

[0209] In addition, since the refrigerant formed by supercooling evaporates at a lower temperature in the fourth heat exchanger 16, the temperature of the air passing through the fourth heat exchanger 16 can be further reduced, thereby improving the cooling performance and efficiency.

[0210] While the above-described process is repeatedly performed, the refrigerant may cool the interior of the vehicle in a cooling mode within the interior of the vehicle, and at the same time, the coolant is cooled by heat exchange while passing through the cooler 20 .

[0211] The low-temperature coolant cooled in the cooler 20 flows to the battery module 5 through the second line 4. Therefore, the battery module 5 can be effectively cooled by the supplied low-temperature coolant.

[0212] Reference Fig.10 The operation in the heating mode in the vehicle interior in this embodiment will be described.

[0213] Fig.10 is an operation diagram according to a heating mode in a vehicle interior in a heat pump system for a vehicle according to an embodiment.

[0214] Reference Fig.10 , the coolant may be circulated through the first pipeline 2 by operation of a water pump (not shown).

[0215] Therefore, the coolant having passed through the electric component 3 may be supplied to the second heat exchanger 14 along the first line 2 .

[0216] Each component in the air conditioning device operates to heat the interior of the vehicle. Therefore, the refrigerant circulates along the refrigerant line 11 .

[0217] A portion of the refrigerant line 11 connecting the first heat exchanger 13 and the second heat exchanger 14 is closed by the operation of the first control device 30 .

[0218] The first connecting line 21 is closed by the operation of the second control device 40. The second connecting line 31 is opened by the operation of the first control device 30.

[0219] Meanwhile, a portion of the refrigerant line 11 connecting the fourth heat exchanger 16 and the third control device 50 is closed by the operation of the third control device 50. In addition, the third connecting line 51 may be opened by the operation of the third control device 50.

[0220] The refrigerant exhausted from the first heat exchanger 13 may be introduced into the fourth heat exchanger 16 along the second connecting line 31 opened by the operation of the first control device 30 and a portion of the opened refrigerant line 11 .

[0221] Therefore, the first heat exchanger 13 and the fourth heat exchanger 16 may cool the refrigerant using the air introduced into the HVAC module 12 .

[0222] An opening and closing door (not shown) may be opened so that the air having passed through the fourth heat exchanger 16 may be introduced into the first heat exchanger 13 .

[0223] The refrigerant that has passed through the fourth heat exchanger 16 is introduced into the second control device 40 along the refrigerant line 11 .

[0224] In the present embodiment, the fourth connecting line 61 is opened by the operation of the fourth control device 60. The fifth connecting line 71 may be opened by the operation of the fifth control device 70.

[0225] In addition, a portion of the refrigerant line 11 connecting the third heat exchanger 15 and the fifth control device 70 may be closed by the operation of the fifth control device 70 .

[0226] The second control device 40 may expand the refrigerant introduced from the fourth heat exchanger 16 , and may make the expanded refrigerant flow to the refrigerant line 11 .

[0227] In other words, some of the refrigerant introduced from the second control device 40 into the refrigerant line 11 , that is, a portion of the refrigerant may flow into the second heat exchanger 14 through the fifth connecting line 71 .

[0228] Therefore, the second heat exchanger 14 may evaporate the expanded refrigerant by exchanging heat with the coolant supplied through the first line 2. The second heat exchanger 14 may recover waste heat of the electric components 3 from the heated coolant by recovering the waste heat from the electric components 3.

[0229] Meanwhile, the remaining portion of the refrigerant introduced into the refrigerant line 11 from the second control device 40 may be introduced into the third heat exchanger 15 along the refrigerant line 11 .

[0230] The third heat exchanger 15 may recover ambient air heat while evaporating the expanded refrigerant through heat exchange with the air.

[0231] In addition, the refrigerant having passed through the third heat exchanger 15 may flow along the opened fourth connecting line 61 .

[0232] Refrigerant discharged from the second and third heat exchangers 14 and 15 may flow along the opened third connecting line 51 and the refrigerant line 11 connecting the third control device 50 and the compressor 10 , and may be supplied to the compressor 10 through the accumulator 17 .

[0233] The first heat exchanger 13 and the fourth heat exchanger 16 may cool the refrigerant by exchanging heat between the air introduced into the HVAC module 12 and the refrigerant. The refrigerant once cooled in the first heat exchanger 13 may be further cooled in the fourth heat exchanger 16.

[0234] In other words, when the refrigerant having passed through the first heat exchanger 13 is supplied to the fourth heat exchanger 16 by operation of the first control device 30 , the fourth heat exchanger 16 may cool the refrigerant by exchanging heat between the air introduced into the HVAC module 12 and the refrigerant.

[0235] The refrigerant having passed through the fourth heat exchanger 16 is introduced into the second control device 40 along the refrigerant line 11. The second control device 40 may expand the refrigerant and supply the expanded refrigerant to the second heat exchanger 14 and the third heat exchanger 15, respectively.

[0236] The refrigerant discharged from the second control device 40 may be branched through the fifth connecting line 71 and supplied to the second heat exchanger 14 and the third heat exchanger 15 , respectively.

[0237] Therefore, the second heat exchanger 14 may cool the supplied refrigerant by exchanging heat with the coolant, and at the same time, the third heat exchanger 15 may cool the supplied refrigerant by exchanging heat with the air.

[0238] While such operation is repeatedly performed, the second heat exchanger 14 and the third heat exchanger 15 may recover waste heat of the electric component 3 and heat of ambient air.

[0239] In other words, since the recovered waste heat of the electric components 3 and the ambient air heat are used to increase the temperature of the refrigerant, the heat pump system can reduce the power consumption of the compressor 10 and improve the heating efficiency.

[0240] The refrigerant discharged from the second heat exchanger 14 and the third heat exchanger 15 is supplied to the third control device 50 along the opened third connecting line 51 .

[0241] The refrigerant is supplied from the third control device 50 to the accumulator 17 along the refrigerant line 11. The refrigerant having passed through the accumulator 17 may be supplied to the compressor 10.

[0242] In addition, the refrigerant is compressed to a high-temperature and high-pressure state by the compressor 10 , and is introduced back into the first heat exchanger 13 along the refrigerant line 11 .

[0243] As described above, the refrigerant supplied to the first heat exchanger 13 and the fourth heat exchanger 16 may increase the temperature of the air introduced into the HVAC module 12 .

[0244] The opening and closing door (not shown) is opened so that the air introduced into the HVAC module 12 and having passed through the fourth heat exchanger 16 can pass through the first heat exchanger 13 .

[0245] Therefore, the air introduced from the outside may be converted into a high temperature state while sequentially passing through the fourth heat exchanger 16 and the first heat exchanger 13. The heated air flows into the vehicle interior, thereby achieving heating of the vehicle interior.

[0246] Therefore, as described above, when the heat pump system for a vehicle according to the embodiment is applied, since cooling or heating in the vehicle interior is performed using a natural refrigerant, environmental regulations can be corresponded to and the overall marketability of the vehicle can be improved.

[0247] In addition, according to the present invention, by applying R744 refrigerant as a natural refrigerant using carbon dioxide, for cooling and heating in the vehicle interior, it is possible to maximize cooling and heating performance by operating in a supercritical region as a state where the pressure and temperature of the refrigerant are higher than the critical pressure and temperature.

[0248] Furthermore, according to the present invention, the single cooler 20 that performs heat exchange using a coolant and a refrigerant effectively adjusts the temperature of the battery module 5 according to the vehicle mode, thereby streamlining and simplifying the system.

[0249] In addition, according to the embodiment, by effectively regulating the temperature of the battery module 5, it is possible to make the battery module 5 perform optimally. In addition, due to the effective management of the battery module 5, the overall driving distance of the vehicle can be increased.

[0250] Furthermore, according to the present invention, in the heating mode in the vehicle interior, the expanded refrigerant is branched by the operation of the second control device 40 and supplied to the second and third heat exchangers 14, 15. Therefore, the flow rate of the refrigerant can be more easily controlled, the ambient air heat and the waste heat of the electric component 3 can be smoothly recovered, and the cooler 20 for cooling the battery module 5 can be optimally designed.

[0251] In addition, according to the embodiment, it is possible to reduce manufacturing cost and weight, and improve space utilization by simplifying the entire system.

[0252] While the invention has been described in conjunction with what are presently considered to be practical embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. On the contrary, the invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A heat pump system for a vehicle, comprising: an air conditioning device including a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, and a fourth heat exchanger connected by a refrigerant line so that a refrigerant circulates through the refrigerant line; as well as a cooler configured to perform heat exchange between the refrigerant supplied from the air conditioning device and the coolant to adjust the temperature of the coolant, Wherein, the air conditioning device further comprises: a first control device disposed on the refrigerant line between the first heat exchanger and the second heat exchanger and configured to selectively supply the refrigerant having passed through the first heat exchanger to the second heat exchanger or the fourth heat exchanger; a second control device disposed on the refrigerant line between the third heat exchanger and the fourth heat exchanger and configured to selectively expand the refrigerant; a first connecting line, a first end of which is connected to the second control device, a second end of which is connected to the refrigerant line between the fourth heat exchanger and the compressor, and is provided with the cooler; a second connecting pipeline, a first end of which is connected to the first control device, and a second end of which is connected to the refrigerant pipeline between the fourth heat exchanger and the compressor; a third control device, disposed on the refrigerant pipeline between the fourth heat exchanger and the compressor; and A third connecting line has a first end connected to the third control device and a second end connected to the refrigerant line between the first control device and the second heat exchanger.

2. The heat pump system according to claim 1, wherein: The first control device comprises: a first valve disposed on the refrigerant line between the first heat exchanger and the second heat exchanger; and A second valve is provided on the second connecting pipeline.

3. The heat pump system according to claim 2, wherein: The first valve and the second valve are two-way valves.

4. The heat pump system according to claim 1, wherein: The first control device comprises: A single first control valve is provided at a portion where the refrigerant line and the second connecting line are connected between the first heat exchanger and the second heat exchanger.

5. The heat pump system according to claim 1, wherein: The second control device comprises: a first expansion valve disposed on the refrigerant pipeline upstream of the fourth heat exchanger; and A second expansion valve is disposed on the first connecting pipeline upstream of the cooler.

6. The heat pump system according to claim 1, wherein: The third control device comprises: a third valve disposed on the refrigerant pipeline between the fourth heat exchanger and the compressor; and The fourth valve is arranged on the third connecting pipeline.

7. The heat pump system according to claim 1, wherein: The third control device comprises: A single second control valve is provided at a portion where the refrigerant line between the fourth heat exchanger and the compressor and the third connecting line are connected.

8. The heat pump system according to claim 1, wherein: The air conditioning device further comprises: a fourth connecting line, a first end of which is connected to the refrigerant line between the first control device and the second heat exchanger, and a second end of which is connected to the refrigerant line between the second heat exchanger and the third heat exchanger; a fourth control device, disposed on the fourth connecting pipeline and configured to selectively open and close the fourth connecting pipeline; a fifth control device, disposed on the refrigerant pipeline between the second heat exchanger and the third heat exchanger; and A fifth connecting line has a first end connected to the fifth control device and a second end connected to the refrigerant line between the third heat exchanger and the fourth heat exchanger.

9. The heat pump system according to claim 8, wherein: The fourth control device is a two-way valve.

10. The heat pump system according to claim 8, wherein: The fifth control device comprises: a fifth valve disposed on the refrigerant line between the second heat exchanger and the third heat exchanger; and A sixth valve is arranged on the fifth connecting pipeline.

11. The heat pump system according to claim 8, wherein: The fifth control device comprises: A single third control valve is provided at a portion where the refrigerant line between the second heat exchanger and the third heat exchanger and the fifth connecting line are connected.

12. The heat pump system according to claim 8, wherein: In cooling mode in the vehicle interior: The refrigerant line connecting the first heat exchanger and the second heat exchanger is opened by operation of the first control device; The refrigerant line connecting the second heat exchanger and the third heat exchanger is opened by operation of the fifth control device; The refrigerant line connecting the fourth heat exchanger and the compressor is opened by operation of the third control device; The second connecting pipeline is closed by operation of the first control device; The third connecting pipeline is closed by operation of the third control device; The fourth connecting line is closed by operation of the fourth control device; and The fifth connecting line is closed by operation of the fifth control device.

13. The heat pump system according to claim 12, wherein: In a cooling mode in the vehicle interior, when cooling of the battery module is required, the first connecting line is opened by operation of the second control device.

14. The heat pump system according to claim 13, wherein: The second control device is configured to expand the refrigerant introduced into the first connecting line and flow the expanded refrigerant to the cooler so that the battery module is cooled by the coolant after heat exchange with the refrigerant in the cooler.

15. The heat pump system according to claim 12, wherein: The second control device is configured to expand the refrigerant to be introduced into the fourth heat exchanger so that the expanded refrigerant is introduced into the fourth heat exchanger.

16. The heat pump system according to claim 8, wherein: In heating mode in the vehicle interior: a portion of the refrigerant line connecting the first heat exchanger and the second heat exchanger is closed by operation of the first control device; The first connecting pipeline is closed by operation of the second control device; The second connecting line is opened by operation of the first control device; a portion of the refrigerant line connecting the fourth heat exchanger and the third control device is closed by operation of the third control device; The third connecting line is opened by operation of the third control device; The fourth connecting line is opened by operation of the fourth control device; The fifth connecting line is opened by operation of the fifth control device; and A portion of the refrigerant line connecting the third heat exchanger and the fifth control device is closed by the operation of the fifth control device.

17. The heat pump system according to claim 16, wherein: The second control device is configured to expand the refrigerant introduced from the fourth heat exchanger and to flow the expanded refrigerant to the refrigerant line.

18. The heat pump system according to claim 16, wherein: a portion of the refrigerant introduced from the second control device into the refrigerant line is introduced into the second heat exchanger through the fifth connecting line; the remaining portion of the refrigerant introduced into the refrigerant line from the second control device is introduced into the third heat exchanger along the refrigerant line; and The refrigerant having passed through the third heat exchanger flows along the opened fourth connecting line.

19. The heat pump system according to claim 16, wherein: The refrigerant discharged from the second heat exchanger and the third heat exchanger is supplied to the compressor along the opened third connecting line and the refrigerant line connecting the third control device and the compressor.

20. The heat pump system according to claim 1, wherein: The second heat exchanger, the third heat exchanger, and the fourth heat exchanger are configured to cool or evaporate refrigerant according to selective operation of the second control device.

21. The heat pump system according to claim 1, wherein: The refrigerant is R744 refrigerant formed of carbon dioxide.

22. The heat pump system according to claim 1, wherein: A liquid accumulator is provided on the refrigerant pipeline between the fourth heat exchanger and the compressor; The first heat exchanger, the third heat exchanger, and the fourth heat exchanger are air-cooled gas cooling devices configured to perform heat exchange between a refrigerant and air; and The second heat exchanger and the cooler are water-cooled gas cooling devices configured to perform heat exchange between a refrigerant and a coolant.

23. The heat pump system of claim 1, wherein: The second heat exchanger is connected to the electrical component via a first pipeline through which a coolant circulates; and The cooler is connected to the battery module through a second line through which a coolant circulates.

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