Heat pump system for a vehicle

Abstract

The present application provides a heat pump system for a vehicle, which is capable of cooling or heating the interior of the vehicle by using a natural refrigerant complying with environmental regulations and effectively adjusting the temperature of a battery module by using a single cooler in which a refrigerant and a coolant are heat-exchanged.

Description

[0001] Cross-reference of related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2024-0180995, filed with the Korean Intellectual Property Office on December 6, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to heat pump systems for vehicles, and more specifically, to heat pump systems for vehicles capable of cooling or heating vehicles. Background Technology

[0004] Air conditioning systems for vehicles include air conditioning units that circulate refrigerant to heat or cool the interior of the vehicle.

[0005] The air conditioning system maintains a suitable temperature inside the vehicle to ensure a comfortable interior environment, regardless of changes in the external temperature. It is configured to heat or cool the vehicle interior by means of heat exchange between the condenser and evaporator as the refrigerant discharged by the compressor circulates back to the compressor through the condenser, receiver-dryer, expansion valve, and evaporator.

[0006] In other words, in summer cooling mode, the air conditioning unit reduces the internal temperature and humidity by condensing the high-temperature, high-pressure gaseous refrigerant compressed by the compressor in the condenser, allowing it to flow through the liquid receiver dryer and expansion valve, and then evaporating in the evaporator.

[0007] Environmentally friendly vehicle technologies are core technologies for the future automotive industry. Leading automakers have focused their efforts on developing environmentally friendly vehicles to meet environmental and fuel efficiency regulations.

[0008] With increasing concerns 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, which use fuel cells or electricity as a power source, and hybrid vehicles, which use both an engine and batteries.

[0009] Electric vehicles are attracting much attention as a future means of transportation to solve environmental and energy problems.

[0010] A heat pump system is an air conditioning device used to regulate the temperature inside a vehicle, and it is suitable for this type of electric vehicle.

[0011] However, the refrigerants conventionally used in heat pump systems contain a large number of environmentally regulated substances, such as PFAS (perfluoroalkyl and polyfluoroalkyl substances). Therefore, there is a need to develop a system that can control the temperature inside a vehicle by using a new refrigerant that is free of PFAS and flammable, or by using a natural refrigerant.

[0012] The information disclosed in this background section is only intended to enhance understanding of the background of this disclosure. Therefore, the background section may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0013] This disclosure provides a heat pump system for vehicles capable of cooling or heating the vehicle interior using environmentally compliant natural refrigerants, and a single chiller that effectively regulates the temperature of the battery module by using refrigerant and coolant for heat exchange.

[0014] Furthermore, by applying R744 refrigerant (which is a natural refrigerant using carbon dioxide) and by operating in the supercritical and subcritical regions where the refrigerant pressure and / or temperature is above the critical pressure and / or temperature, this disclosure provides a heat pump system for vehicles capable of maximizing cooling and heating performance.

[0015] A heat pump system for a vehicle includes a compressor, a first heat exchanger, a second heat exchanger, a first expansion valve, and a third heat exchanger connected via refrigerant lines to circulate refrigerant. The heat pump system also includes a cooler connected to the refrigerant lines via a first connecting line, the cooler being configured to regulate the temperature of the coolant by heat exchange between the supplied refrigerant and the coolant. The heat pump system also includes a second expansion valve disposed on the first connecting line and a third expansion valve disposed on the refrigerant line between the third heat exchanger and the compressor. The heat pump system also includes a second connecting line comprising a first end connected to the refrigerant line between the first and second heat exchangers and a second end connected to the refrigerant line between the second and third heat exchangers. The heat pump system also includes a fourth expansion valve disposed on the second connecting line. The heat pump system also includes a third connecting line comprising a first end connected to the refrigerant line between the compressor and the first heat exchanger and a second end connected to the refrigerant line between the first and second heat exchangers. The heat pump system also includes a fourth connection line, which includes a first end of a refrigerant line connected between the second heat exchanger and the third heat exchanger, and a second end of a refrigerant line connected between the third heat exchanger and the third expansion valve.

[0016] The heat pump system may also include a first valve on the refrigerant line between the first heat exchanger and the second heat exchanger, a second valve on the refrigerant line between the third expansion valve and the compressor, a third valve on the third connecting line, and a fifth expansion valve on the fourth connecting line.

[0017] The heat pump system may further include: a fifth connecting line, the fifth connecting line including a first end of a refrigerant line connected between the third expansion valve and the compressor, and a second end of a refrigerant line connected between the first heat exchanger and the second heat exchanger; a fourth valve disposed on the fifth connecting line; a sixth connecting line, the sixth connecting line including a first end of a first connecting line connected between the second expansion valve and the cooler, and a second end of a connecting line connected to the third connecting line; and a sixth expansion valve disposed on the sixth connecting line.

[0018] The heat pump system may also include a receiver for the refrigerant line disposed between the third heat exchanger and the compressor. The heat pump system may also include an internal heat exchanger disposed inside the receiver, the internal heat exchanger being configured to allow refrigerant supplied from the second heat exchanger to exchange heat with refrigerant supplied from the third heat exchanger, so as to supply the refrigerant with the higher temperature after heat exchange to the third heat exchanger.

[0019] When heating the battery module, the portions of the refrigerant line connecting the compressor and the first heat exchanger, and the portions connecting the first and second heat exchangers, can be closed by the first valve. The portion of the refrigerant line connecting the first end of the fifth connecting line and the compressor can be opened. The portion of the refrigerant line connecting to the second heat exchanger can be opened, connecting the first end of the fourth connecting line and the second end of the fifth connecting line. The portion of the refrigerant line connecting the second end of the first connecting line and the second end of the fourth connecting line can be opened by the third expansion valve. The portion of the refrigerant line connecting the second end of the first connecting line and the first end of the fifth connecting line can be closed by the second valve. The portion of the first connecting line connecting the first end of the sixth connecting line and the cooler can be opened. The remaining portion of the first connecting line upstream of the cooler, connecting the refrigerant line and the sixth connecting line, can be closed by the second expansion valve. The second connecting line can be closed by the fourth expansion valve. A portion of the third connecting line can be opened, connecting the portion of the refrigerant line connecting to the compressor and the sixth connecting line. The remaining portion of the third connecting line can be closed by the third valve. The fourth connecting line can be opened by the fifth expansion valve, the fifth connecting line can be opened by the fourth valve, and the sixth connecting line can be opened by the sixth expansion valve.

[0020] The third and sixth expansion valves allow the introduced refrigerant to flow without expansion. The fifth expansion valve allows the introduced refrigerant to flow in an expanded state. Refrigerant discharged from the compressor can be sequentially introduced into the cooler along a portion of the third connecting line, the sixth connecting line, and a portion of the first connecting line. Refrigerant flowing through the cooler can be introduced into the second heat exchanger along a portion of the first connecting line, the fourth connecting line, and an open portion of the refrigerant line. Refrigerant discharged from the second heat exchanger can flow along a portion of the refrigerant line and the fifth connecting line through the internal heat exchanger and receiver to supply the compressor.

[0021] In the vehicle's interior hot air heating mode, the portion of the refrigerant line connecting the first end of the first connecting line and the second end of the second connecting line can be closed by the first expansion valve. The portion of the refrigerant line connecting the first end of the second connecting line and the second end of the fifth connecting line can be closed by the first valve. The portion of the refrigerant line connecting the second end of the second connecting line to the second end of the first connecting line via the third heat exchanger can be opened by the third expansion valve. The portion of the refrigerant line connecting the second end of the first connecting line and the first end of the fifth connecting line can be opened by the second valve. The portion of the refrigerant line connecting the second end of the fifth connecting line to the first end of the first connecting line via the second heat exchanger can be closed. The portion of the first connecting line connecting the first end of the sixth connecting line and the cooler can be opened. The remaining portion of the first connecting line connecting the refrigerant line and the sixth connecting line upstream of the cooler can be closed by the second expansion valve. The second connecting line can be opened by the fourth expansion valve. A portion of the third connecting line can be opened, connecting the portion of the refrigerant line connected to the compressor and the sixth connecting line. The remaining portion of the third connecting line can be closed by the third valve. The fourth connecting line can be closed by the fifth expansion valve, the fifth connecting line can be closed by the fourth valve, and the sixth connecting line can be opened by the sixth expansion valve.

[0022] The third and sixth expansion valves allow the introduced refrigerant to flow in an expanded state. The fourth expansion valve allows the introduced refrigerant to flow without expansion. A portion of the refrigerant discharged from the compressor can be introduced into the first heat exchanger along the refrigerant line. The refrigerant flowing through the first heat exchanger can be introduced into the third heat exchanger along the second connecting line and the open refrigerant line. The remaining refrigerant discharged from the compressor can be introduced into the cooler along a portion of the third connecting line, the sixth connecting line, and the open first connecting line. The refrigerant flowing from the third heat exchanger through the third expansion valve, and the refrigerant discharged from the cooler, can flow along a portion of the coolant line through the internal heat exchanger and receiver to supply the compressor.

[0023] In the vehicle's heating mode, the portion of the refrigerant pipeline connecting the first end of the first connecting line and the second end of the second connecting line can be closed by the first expansion valve. The portion of the refrigerant pipeline connecting the first end of the second connecting line and the second end of the fifth connecting line can be closed by the first valve. The portion of the refrigerant pipeline connecting the second end of the fourth connecting line and the second end of the first connecting line can be closed by the third expansion valve. The portion of the refrigerant pipeline connecting the second end of the first connecting line and the first end of the fifth connecting line can be opened by the second valve. The first connecting line can be opened by the second expansion valve, the second connecting line can be opened by the fourth expansion valve, and the third connecting line can be closed by the third valve; the fourth connecting line can be opened by the fifth expansion valve, the fifth connecting line can be opened by the fourth valve, and the sixth connecting line can be closed by the sixth expansion valve.

[0024] The second and fourth expansion valves allow the introduced refrigerant to flow without expansion. The fifth expansion valve allows the refrigerant to flow in an expanded state, supplying the expanded refrigerant to the second heat exchanger, the internal heat exchanger, and the cooler. A portion of the refrigerant introduced from the third heat exchanger into the fourth connecting line can be introduced into the second heat exchanger, and the remaining refrigerant introduced from the third heat exchanger into the fourth connecting line can be introduced into the internal heat exchanger.

[0025] A portion of the refrigerant discharged from the fifth expansion valve can flow along the refrigerant line through the internal heat exchanger to be introduced into the cooler, and the refrigerant discharged from the second heat exchanger and the cooler can flow through the internal heat exchanger and the receiver to be supplied to the compressor.

[0026] When heating the battery module is required in the vehicle's interior heating mode, the portions of the refrigerant lines connecting the first end of the first connecting line and the second end of the second connecting line, as well as the portions connecting the first end of the fourth connecting line and the first end of the first connecting line, can be closed by the first expansion valve. The portions of the refrigerant lines connecting the first end of the second connecting line and the second end of the fifth connecting line can be closed by the first valve. The portions of the refrigerant lines connecting the second end of the second connecting line and the second end of the first connecting line via the third heat exchanger can be opened by the third expansion valve. The portions of the refrigerant lines connecting the second end of the first connecting line and the first end of the fifth connecting line can be closed by the second valve. The portions of the refrigerant lines connected to the second heat exchanger can be opened, connecting the first end of the fourth connecting line and the second end of the fifth connecting line. The portion of the first connecting line connecting the first end of the sixth connecting line and the cooler can be opened. The remaining portion of the first connecting line upstream of the cooler, connecting the refrigerant line and the sixth connecting line, can be closed by the second expansion valve. The second connecting line can be opened by the fourth expansion valve. A portion of the third connecting line can be opened, connecting the portion of the refrigerant line to the compressor and the sixth connecting line. The remainder of the third connecting line can be closed by the third valve, the fourth connecting line can be opened by the fifth expansion valve, the fifth connecting line can be opened by the fourth valve, and the sixth connecting line can be opened by the sixth expansion valve.

[0027] The third, fourth, and sixth expansion valves allow the introduced refrigerant to flow without expansion. The fifth expansion valve allows the introduced refrigerant to flow in an expanded state. A portion of the refrigerant discharged from the compressor can be introduced into the first heat exchanger along the refrigerant line. The refrigerant flowing through the first heat exchanger can be introduced into the third heat exchanger along the second connecting line and the open refrigerant line. The remaining refrigerant discharged from the compressor can be introduced into the cooler along a portion of the third connecting line, the sixth connecting line, and the open first connecting line. The refrigerant flowing through the third heat exchanger, as well as the refrigerant from the cooler flowing through the third expansion valve, can be introduced into the second heat exchanger along a portion of the refrigerant line and the fourth connecting line. The refrigerant discharged from the second heat exchanger can flow along the open portion of the refrigerant line and the fifth connecting line through the internal heat exchanger and receiver to supply the compressor.

[0028] In the vehicle's interior heating and dehumidification mode, the portion of the refrigerant line connecting the first end of the first connecting line and the second end of the second connecting line can be closed by the first expansion valve. The portion of the refrigerant line connecting the first end of the second connecting line and the second heat exchanger can be closed by the first valve. The portion of the refrigerant line connecting the third heat exchanger and the receiver can be opened by the second valve and the third expansion valve. The portion of the refrigerant line connecting the second heat exchanger to the internal heat exchanger and the first end of the first connecting line can be closed. The first connecting line can be closed by the second expansion valve. The second connecting line can be opened by the fourth expansion valve. The third connecting line can be closed by the third valve. The fourth connecting line can be closed by the fifth expansion valve. The fifth connecting line can be closed by the fourth valve, and the sixth connecting line can be closed by the sixth expansion valve.

[0029] The third expansion valve allows the introduced refrigerant to flow without expansion. The fourth expansion valve allows the refrigerant introduced from the first heat exchanger through the second connecting line to flow in an expanded state. Refrigerant discharged from the compressor can be introduced into the first heat exchanger along a portion of the refrigerant line. Refrigerant flowing through the first heat exchanger can be introduced into the third heat exchanger along the second connecting line and the opened refrigerant line. Refrigerant from the third heat exchanger flowing through the third expansion valve can flow along the opened portion of the refrigerant line through the internal heat exchanger and receiver to supply the compressor.

[0030] When the vehicle's cooling mode requires cooling the battery module, the portions of the refrigerant line connecting the compressor and the first heat exchanger, and the portions connecting the first and second heat exchangers, can be closed by the first valve. The portion of the refrigerant line connecting the second end of the third connecting line and the second heat exchanger can be opened. The portion of the refrigerant line connecting the second and third heat exchangers can be opened by the first expansion valve. The portion of the refrigerant line connecting the third heat exchanger and the compressor can be opened by the third expansion valve. The portion of the refrigerant line connecting the second end of the first connecting line and the first end of the fifth connecting line can be opened by the second valve. The first connecting line can be opened by the second expansion valve, the second connecting line can be closed by the fourth expansion valve, the third connecting line can be opened by the third valve, the fourth connecting line can be closed by the fifth expansion valve, the fifth connecting line can be closed by the fourth valve, and the sixth connecting line can be closed by the sixth expansion valve.

[0031] The first expansion valve allows the introduced refrigerant to flow in an expanded state. The second expansion valve allows the introduced refrigerant to flow in an expanded state, allowing the battery module to be cooled using the refrigerant that has exchanged heat with the refrigerant in the cooler. The third expansion valve allows the introduced refrigerant to flow without expansion. Refrigerant discharged from the compressor can flow along the third connecting line and a portion of the refrigerant line through the second heat exchanger to be introduced into the internal heat exchanger. A portion of the refrigerant discharged from the internal heat exchanger can be introduced into the cooler along the first connecting line. The remaining refrigerant discharged from the internal heat exchanger can be introduced into the first expansion valve along the refrigerant line. Refrigerant discharged from the cooler and refrigerant discharged from the third heat exchanger can flow along the refrigerant line through the internal heat exchanger and the receiver to be supplied to the compressor.

[0032] The second and third heat exchangers can be configured to cool or evaporate the refrigerant introduced internally.

[0033] The first end of the first connecting line can be connected to the refrigerant line between the second heat exchanger and the first expansion valve, and the second end of the first connecting line can be connected to the refrigerant line between the third heat exchanger and the compressor.

[0034] The first heat exchanger, the second heat exchanger, and the third heat exchanger can be air-cooled gas cooling devices configured to exchange heat between the internally introduced refrigerant and air, and the cooler is a water-cooled gas cooling device configured to exchange heat between the internally introduced refrigerant and coolant.

[0035] As described above, the heat pump system for vehicles according to the embodiments of this disclosure can use natural refrigerants to cool or heat the vehicle interior, thereby enabling it to comply with environmental regulations and improve the overall marketability of the vehicle.

[0036] Furthermore, according to this disclosure, when cooling and heating the vehicle interior, by operating the refrigerant in the supercritical and subcritical regions where the pressure and / or temperature of the refrigerant is above the critical pressure and / or temperature, and by using R744 refrigerant as a natural refrigerant utilizing carbon dioxide, the cooling and heating performance can be maximized.

[0037] Furthermore, according to this disclosure, by using a single cooler in which the coolant and refrigerant exchange heat with each other, the temperature of the battery module can be effectively regulated according to the vehicle mode, thereby achieving system streamlining and simplification.

[0038] Furthermore, according to this disclosure, the optimal performance of the battery module can be obtained by effectively regulating the temperature of the battery module, and the overall driving range of the vehicle can be increased through effective management of the battery module.

[0039] Furthermore, according to this disclosure, even when the external temperature is low and the heat generated by the electrical components and battery module is insufficient, it is possible to use the high-temperature refrigerant compressed in the compressor to heat the interior of the vehicle.

[0040] Furthermore, according to this disclosure, by using a coolant that is heated through heat exchange with the refrigerant to heat the battery module, a separate coolant heater for heating the battery module can be eliminated, and the power consumption for raising the temperature of the battery module is minimized.

[0041] Furthermore, according to this disclosure, by streamlining the entire system, manufacturing costs and weight can be reduced, and space utilization can be improved. Attached Figure Description

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

[0043] Figure 2 This is an operational diagram of a heat pump system for a vehicle used to heat a battery module according to an embodiment of the present disclosure.

[0044] Figure 3 This is an operational diagram of a heat pump system for vehicles according to an embodiment of the present disclosure, used for heating the interior of a vehicle using hot air.

[0045] Figure 4 This is an operational diagram of a heat pump system for a vehicle, according to an embodiment of the present disclosure, for heating mode of the vehicle interior.

[0046] Figure 5 This is an operational diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure, used for heating a battery module in a heating mode inside the vehicle.

[0047] Figure 6 This is an operation diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure, based on the heating and dehumidification mode of the vehicle interior.

[0048] Figure 7 This is an operational diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure for cooling a battery module in a cooling mode inside the vehicle. Detailed Implementation

[0049] The embodiments of this disclosure will be described in detail below with reference to the accompanying drawings.

[0050] The embodiments disclosed herein and the structures shown in the accompanying drawings are merely exemplary embodiments of the present invention and do not cover the full scope of the invention. Therefore, it should be understood that various equivalents and variations of the disclosed embodiments can exist when applying the technical concept of this specification.

[0051] To clarify the invention, parts unrelated to the description may be omitted. Furthermore, throughout the specification, the same or equivalent elements are referred to using the same reference numerals.

[0052] Furthermore, the dimensions and thicknesses of the components may be shown schematically in the accompanying drawings, but the invention is not necessarily limited thereto. For clarity, the thicknesses of layers, films, plates, regions, etc., may be exaggerated in the drawings.

[0053] Furthermore, unless explicitly stated otherwise, the words “comprising,” “having,” “including,” and variations thereof, such as “containing” or “including,” should be understood to imply inclusion of the stated element, but not exclusion of any other element.

[0054] Furthermore, all terms used in this specification, such as “…unit,” “…device,” “…section,” “…component,” and “…building,” refer to a unit of integrated elements that performs at least one function or operation. When a component, device, apparatus, module, controller, detector, element, etc., of the present invention is described as having a certain purpose or performing a certain operation or function, that component, device, apparatus, module, controller, detector, or element should be considered as “configured / set to” satisfy that purpose or perform that operation or function. The present invention describes a controller and data detector for a cooling system. Controllers, detectors, or other such components may individually include or integrate processors and memory (e.g., non-transitory computer-readable media) as part of the controller or component.

[0055] Figure 1 This is a block diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0056] The heat pump system for vehicles according to embodiments of this disclosure can use natural refrigerants that comply with environmental regulations to cool or heat the interior of the vehicle, and can effectively regulate the temperature of the battery module 5 using a single cooler 20 in which the refrigerant and coolant exchange heat with each other.

[0057] The refrigerant can be R744, which is formed from carbon dioxide. Its ozone depletion potential (ODP) is 0 and its global warming potential (GWP) is 1.

[0058] That is, the heat pump system for vehicles according to the present disclosure maximizes cooling and heating performance by operating in the supercritical and subcritical regions where the pressure and / or temperature of the refrigerant is above the critical pressure and / or temperature, and by using the natural refrigerant R744 that utilizes carbon dioxide.

[0059] To achieve this objective, a heat pump system according to an embodiment of the present disclosure may include a compressor 10, a first heat exchanger 13, a second heat exchanger 14, a first expansion valve 15, a third heat exchanger 16, a receiver 17, an internal heat exchanger 17a, and a cooler 20 connected via a refrigerant line 11 to circulate refrigerant through the refrigerant line 11.

[0060] The compressor 10 can compress the introduced refrigerant and allow the compressed refrigerant to flow through the refrigerant line 11, thereby circulating the refrigerant along the refrigerant line 11.

[0061] The first heat exchanger 13 can selectively allow the refrigerant supplied from the compressor 10 to exchange heat with the air.

[0062] The second heat exchanger 14 can be connected to the first heat exchanger 13 via the refrigerant line 11. Therefore, refrigerant supplied from the refrigerant line 11 can flow through the second heat exchanger 14.

[0063] The second heat exchanger 14 can be located at the front of the vehicle and can cool or evaporate the refrigerant by exchanging heat with air introduced from the outside when the vehicle is in motion. A cooling fan 7 can be installed downstream of the second heat exchanger 14.

[0064] Unlike typical refrigerants, R744 refrigerant does not undergo a phase change; therefore, the term "gas cooling" can be used instead of "condensation."

[0065] In embodiments of this disclosure, a first expansion valve 15 may be disposed on a refrigerant line 11 between a second heat exchanger 14 and a third heat exchanger 16. The first expansion valve 15 may selectively expand the refrigerant introduced through the refrigerant line 11.

[0066] In other words, the first expansion valve 15 can selectively expand the refrigerant while controlling the flow of the refrigerant.

[0067] In addition, the third heat exchanger 16 can be installed on the refrigerant line 11 between the first expansion valve 15 and the compressor 10.

[0068] The first heat exchanger 13 and the third heat exchanger 16 can be installed inside the heating, ventilation, and air-conditioning (HVAC) module 12.

[0069] Therefore, the third heat exchanger 16 can cool or evaporate the refrigerant by exchanging heat with the air introduced into the HVAC module 12.

[0070] In other words, the first heat exchanger 13, the second heat exchanger 14, and the third heat exchanger 16 can be air-cooled gas coolers configured to allow the refrigerant introduced into the interior to exchange heat with the air.

[0071] The second heat exchanger 14 and the third heat exchanger 16 can evaporate the refrigerant when it is introduced after expansion, and cool the refrigerant when it is introduced before expansion.

[0072] In embodiments of this disclosure, the receiver 17 may be disposed on the refrigerant line 11 between the third heat exchanger 16 and the compressor 10.

[0073] The receiver 17 can supply only gaseous refrigerant to the compressor 10, thereby improving the efficiency and durability of the compressor 10.

[0074] Furthermore, an internal heat exchanger 17a may be provided inside the receiver 17. The internal heat exchanger 17a allows the refrigerant supplied from the second heat exchanger 14 to exchange heat with the refrigerant supplied from the third heat exchanger 16, and can supply the refrigerant with the higher temperature after heat exchange to the third heat exchanger 16.

[0075] That is, the internal heat exchanger can allow the refrigerant cooled in the second heat exchanger 14 to exchange heat with the low-temperature refrigerant discharged from the third heat exchanger 16, and can supply the heat-exchanged refrigerant to the third heat exchanger 16 and the compressor 10 respectively.

[0076] In embodiments of this disclosure, the cooler 20 can be connected to the electrical components 3 via a first pipeline 2 through which the coolant circulates.

[0077] Electrical component 3 may include power conversion devices such as power control unit (EPCU), motor, inverter or on-board charger (OBC) and autonomous driving controller, etc.

[0078] Electrical component 3, configured in this way, can be connected to the first pipeline 2 and cooled by water cooling.

[0079] The cooler 20 can regulate the temperature of the electrical components 3 by using a coolant that has exchanged heat with the refrigerant, and can recover the waste heat of the electrical components 3.

[0080] Furthermore, the cooler 20 can be connected to the battery module 5 via a second pipeline 4 through which the coolant circulates. Therefore, the coolant can be selectively circulated via the cooler 20.

[0081] Cooler 20 can regulate the temperature of the coolant by exchanging heat between the supplied refrigerant and the coolant. In other words, cooler 20 can be a water-cooled gas cooler configured to exchange heat between the refrigerant introduced into it and the coolant.

[0082] The cooler 20 can be connected to the refrigerant line 11 via the first connecting line 21.

[0083] The first end of the first connecting line 21 can be connected to the refrigerant line 11 between the second heat exchanger 14 and the first expansion valve 15. In addition, the second end of the first connecting line 21 can be connected to the refrigerant line 11 between the third heat exchanger 16 and the receiver 17.

[0084] That is, the cooler 20 can regulate the temperature of the coolant by exchanging heat between the coolant selectively introduced through the first line 2 or the second line 4 and the selectively supplied refrigerant.

[0085] Therefore, the coolant that has undergone heat exchange in the cooler 20 can circulate through the first pipeline 2 via the electrical component 3. Furthermore, the coolant that has undergone heat exchange in the cooler 20 can circulate through the second pipeline 4 via the battery module 5.

[0086] Water pumps (not shown) may be installed in the first pipeline 2 and the second pipeline 4.

[0087] That is, the coolant can circulate along the first pipeline 2 and the second pipeline 4 according to the operation of each water pump (not shown).

[0088] Therefore, the coolant that has exchanged heat with the refrigerant in the cooler 20 can be selectively supplied to the electrical components 3 and the battery module 5 to regulate the temperature of the electrical components 3 and the battery module 5.

[0089] The heat pump system may also include a first valve 18, a second valve 19, a second expansion valve 23, a third expansion valve 25, a second connecting line 31, a fourth expansion valve 33, a third connecting line 41, a third valve 43, a fourth connecting line 51, a fifth expansion valve 53, a fifth connecting line 61, a fourth valve 63, a sixth connecting line 71, and a sixth expansion valve 73.

[0090] The first valve 18 can be installed on the refrigerant line 11 between the first heat exchanger 13 and the second heat exchanger 14.

[0091] The first valve 18 can selectively open and close the refrigerant line 11, so that the refrigerant discharged from the first heat exchanger 13 can be selectively introduced into the second heat exchanger 14.

[0092] In embodiments of this disclosure, the second valve 19 may be disposed on the refrigerant line 11 between the third heat exchanger 16 and the compressor 10. The second valve 19 may also be disposed on the refrigerant line 11 between the third expansion valve 25 and the receiver 17.

[0093] The second valve 19 can open the refrigerant line 11, allowing at least one of the refrigerants discharged from the third heat exchanger 16 and the cooler 20 to be introduced into the receiver 17. The second valve 19 can also close the refrigerant line 11, preventing one of the refrigerants discharged from the third heat exchanger 16 and the cooler 20 from being introduced into the receiver 17.

[0094] That is, when the battery module 5 needs to be heated, the second valve 19 can close the refrigerant line 11 so that the refrigerant discharged from the cooler 20 is not introduced into the receiver 17.

[0095] In addition, when heating the battery module 5 while heating the interior of the vehicle, the second valve 19 can close the refrigerant line 11 so that the refrigerant discharged from the third heat exchanger 16 and the refrigerant discharged from the cooler 20 are not introduced into the receiver 17 together.

[0096] In either the vehicle's interior cooling mode or the vehicle's interior hot air heating mode, the second valve 19 can open the refrigerant line 11, allowing the refrigerant discharged from the third heat exchanger 16 and the refrigerant discharged from the cooler 20 to be introduced into the receiver 17.

[0097] In addition, in the vehicle's interior heating mode, the second valve 19 can open the refrigerant line 11, allowing the refrigerant discharged from the cooler 20 to be introduced into the receiver 17.

[0098] In addition, in the vehicle's interior heating and dehumidification mode, the second valve 19 can open the refrigerant line 11, allowing the refrigerant discharged from the third heat exchanger 16 to be introduced into the receiver 17.

[0099] The second expansion valve 23 can be installed on the first connecting pipeline 21.

[0100] Depending on the selected air conditioning mode inside the vehicle, the second expansion valve 23 can selectively expand the refrigerant introduced into the first connecting line 21 and allow the selectively expanded refrigerant to flow into the cooler 20.

[0101] In addition, the second expansion valve 23 can supply refrigerant introduced into the first connecting line 21 to the cooler 20 without expansion, or it can close the first connecting line 21 so that refrigerant is not supplied to the cooler 20.

[0102] In other words, the second expansion valve 23 can selectively expand the refrigerant while controlling the flow of the refrigerant.

[0103] When the battery module 5 is cooled using coolant that has undergone heat exchange with the refrigerant in the cooler 20, the second expansion valve 23 can open the first connecting line 21. The second expansion valve 23 can cause the refrigerant introduced into the first connecting line 21 to expand, and allow the expanded refrigerant to flow into the cooler 20.

[0104] In other words, the second expansion valve 23 can expand the refrigerant discharged from the second heat exchanger 14 to lower its temperature and allow the expanded refrigerant to flow into the cooler 20, thereby further reducing the temperature of the coolant flowing through the cooler 20.

[0105] Therefore, the coolant whose temperature has decreased when flowing through the cooler 20 can be introduced into the battery module 5, thereby achieving more efficient cooling.

[0106] The third expansion valve 25 can be installed on the refrigerant line 11 between the third heat exchanger 16 and the compressor 10. The third expansion valve 25 can be installed on the refrigerant line 11 between the third heat exchanger 16 and the second valve 19.

[0107] Depending on the selected vehicle interior air conditioning mode, the third expansion valve 25 can allow the refrigerant introduced through the refrigerant line 11 to flow in a selectively expanded or unexpanded state.

[0108] In other words, the third expansion valve 25 can selectively expand the refrigerant while controlling the flow of the refrigerant.

[0109] In embodiments of this disclosure, the first end of the second connecting line 31 can be connected to the refrigerant line 11 between the first heat exchanger 13 and the second heat exchanger 14. The second end of the second connecting line 31 can be connected to the refrigerant line 11 between the second heat exchanger 14 and the third heat exchanger 16.

[0110] A fourth expansion valve 33 may be installed in the second connecting line 31. The fourth expansion valve 33 may selectively open and close the second connecting line 31, and may selectively expand the refrigerant introduced through the second connecting line 31.

[0111] In the vehicle's interior cooling mode, the fourth expansion valve 33 can close the second connecting line 31. In other words, in the vehicle's interior heating mode, the fourth expansion valve 33 can open the second connecting line 31.

[0112] In addition, in the vehicle's interior heating and dehumidification mode, the fourth expansion valve 33 can open the second connecting line 31 and allow the refrigerant introduced through the second connecting line 31 to expand.

[0113] In other words, the fourth expansion valve 33 can selectively expand the refrigerant while controlling the flow of the refrigerant.

[0114] In embodiments of this disclosure, the first end of the third connecting line 41 can be connected to the refrigerant line 11 between the compressor 10 and the first heat exchanger 13. The second end of the third connecting line 41 can be connected to the refrigerant line 11 between the first heat exchanger 13 and the second heat exchanger 14.

[0115] The third valve 43 can be installed on the third connecting line 41. The third valve 43 can selectively open and close the third connecting line 41.

[0116] In other words, in the vehicle's cooling mode, the third valve 43 can open the third connecting line 41. In the vehicle's heating mode and in the vehicle's heating and dehumidification mode, the third valve 43 can close a portion of the third connecting line 41.

[0117] The first end of the fourth connecting line 51 can be connected to the refrigerant line 11 between the second heat exchanger 14 and the third heat exchanger 16. The second end of the fourth connecting line 51 can be connected to the refrigerant line 11 between the third heat exchanger 16 and the third expansion valve 25.

[0118] The fifth expansion valve 53 can be installed in the fourth connecting pipeline 51.

[0119] The fifth expansion valve 53 can selectively open and close the fourth connecting line 51 to control the flow of refrigerant, and can selectively expand the refrigerant introduced into the fourth connecting line 51.

[0120] In the vehicle's interior heating mode, the fifth expansion valve 53 can open the fourth connecting line 51, allowing the refrigerant introduced through the fourth connecting line 51 to expand, and the expanded refrigerant can be supplied to the second heat exchanger 14 and the internal heat exchanger 17a respectively.

[0121] Therefore, in the vehicle's interior heating mode, the second heat exchanger 14 can evaporate the refrigerant by exchanging heat with air introduced from the outside.

[0122] The refrigerant flowing through the internal heat exchanger 17a can be supplied to the cooler 20. The cooler 20 can evaporate the refrigerant by exchanging heat with the refrigerant supplied via the first line 2.

[0123] In either the vehicle's cooling mode or the vehicle's heating / dehumidification mode, the fifth expansion valve 53 can close the fourth connecting line 51.

[0124] In other words, the fifth expansion valve 53 can selectively expand the refrigerant while controlling the flow of the refrigerant.

[0125] In embodiments of this disclosure, the first end of the fifth connecting line 61 can be connected to the refrigerant line 11 between the second valve 19 and the compressor 10. The second end of the fifth connecting line 61 can be connected to the refrigerant line 11 between the first heat exchanger 13 and the second heat exchanger 14.

[0126] The fourth valve 63 can be installed on the fifth connecting line 61. The fourth valve 63 can control the flow of refrigerant by selectively opening and closing the fifth connecting line 61.

[0127] In the vehicle's interior cooling mode, or in the vehicle's interior heating and dehumidification mode, or in the vehicle's interior hot air heating mode, the fourth valve 63 can close the fifth connecting line 61.

[0128] When the vehicle is in heating mode, or when the battery module needs to be heated in the vehicle's heating mode, or when the battery module needs to be heated, the fourth valve 63 can open the fifth connecting line 61.

[0129] Furthermore, the first end of the sixth connecting line 71 can be connected to the first connecting line 21 between the second expansion valve 23 and the cooler 20. The second end of the sixth connecting line 71 can be connected to the third connecting line 41.

[0130] The sixth expansion valve 73 can be installed in the sixth connecting line 71. The sixth expansion valve 73 can control the flow of refrigerant by selectively opening and closing the sixth connecting line 71, and can selectively expand the refrigerant introduced into the sixth connecting line 71.

[0131] More specifically, in the hot air heating mode inside the vehicle, the sixth expansion valve 73 can open the sixth connecting line 71, which can expand the refrigerant introduced through the sixth connecting line 71, and can supply the expanded refrigerant to the cooler 20.

[0132] In the vehicle's interior cooling mode, or in the vehicle's interior heating mode, or in the vehicle's interior heating and dehumidification mode, the sixth expansion valve 73 can close the sixth connecting line 71.

[0133] Furthermore, when the battery module 5 needs to be heated in the vehicle's interior heating mode, or when the battery module 5 needs to be heated, the sixth expansion valve 73 can open the sixth connecting line 71, and the refrigerant introduced through the sixth connecting line 71 can be supplied to the cooler 20 without expansion.

[0134] In other words, the sixth expansion valve 73 can selectively expand the refrigerant while controlling the flow of the refrigerant.

[0135] The first valve 18, the second valve 19, the third valve 43, and the fourth valve 63 can be two-way valves that open and close the refrigerant line 11, the third connecting line 41, and the fifth connecting line 61 and control the refrigerant flow rate.

[0136] In addition, the first expansion valve 15, the second expansion valve 23, the third expansion valve 25, the fourth expansion valve 33, the fifth expansion valve 53 and the sixth expansion valve 73 may be electronic expansion valves configured to selectively expand the refrigerant while controlling the flow of the refrigerant.

[0137] In the following text, reference will be made to Figures 2 to 7 The operation and function of the heat pump system for a vehicle configured in the manner described above according to the embodiments of the present disclosure will be explained in more detail.

[0138] refer to Figure 2 Detailed instructions on heating battery module 5 when its temperature is low.

[0139] Figure 2 This is an operational diagram of a heat pump system for a vehicle for heating a battery module according to an embodiment of the present disclosure.

[0140] refer to Figure 2 The heat pump system can increase the temperature of battery module 5 by using a coolant that has exchanged heat with the refrigerant.

[0141] The coolant does not circulate through the first line 2. Instead, the coolant circulates along the second line 4 via the operation of a water pump (not shown).

[0142] Therefore, the coolant flowing through the battery module 5 can be supplied to the cooler 20 along the second pipeline 4.

[0143] In a heat pump system, individual components can be operated to heat the battery module 5. Therefore, the refrigerant can circulate along the refrigerant line 11.

[0144] The portion of the refrigerant line 11 connecting the compressor 10 and the first heat exchanger 13, as well as the portion of the refrigerant line 11 connecting the first heat exchanger 13 and the second heat exchanger 14, can be closed by the first valve 18.

[0145] The portion of refrigerant line 11 that connects the first end of the fifth connecting line 61 and the compressor 10 can be opened.

[0146] Furthermore, the portion of the refrigerant line 11 connected to the second heat exchanger 14 can be opened, allowing the first end of the fourth connecting line 51 to connect to the second end of the fifth connecting line 61.

[0147] In addition, the portion of the refrigerant line 11 that connects the second end of the first connecting line 21 and the second end of the fourth connecting line 51 can be opened by the third expansion valve 25.

[0148] The third expansion valve 25 allows refrigerant introduced through refrigerant line 11 to flow without expansion.

[0149] In addition, the portion of the refrigerant line 11 that connects the second end of the first connecting line 21 and the first end of the fifth connecting line 61 can be opened by the second valve 19.

[0150] The portion of the first connecting line 21 that connects the first end of the sixth connecting line 71 and the cooler 20 can be opened.

[0151] In addition, the remaining portion of the first connecting line 21 that connects the refrigerant line 11 and the sixth connecting line 71 upstream of the cooler 20 can be closed by the second expansion valve 23.

[0152] The second connecting line 31 can be closed by the fourth expansion valve 33.

[0153] In addition, a portion of the third connecting line 41 can be opened so that the portion of the refrigerant line 11 connected to the compressor 10 is connected to the sixth connecting line 71.

[0154] The remainder of the third connecting line 41 can be shut off by the third valve 43.

[0155] The fourth connecting line 51 can be opened by the fifth expansion valve 53.

[0156] The fifth expansion valve 53 can expand the refrigerant introduced through the fourth connecting line 51.

[0157] The fifth connecting line 61 can be opened by the fourth valve 63. Furthermore, the sixth connecting line 71 can be opened by the sixth expansion valve 73.

[0158] The sixth expansion valve 73 allows refrigerant introduced through the sixth connecting line 71 to flow without expansion. Therefore, the refrigerant discharged from the sixth expansion valve 73 can be supplied to the cooler 20 in an unexpanded state.

[0159] Therefore, the refrigerant discharged from the compressor 10 can be introduced into the cooler 20 in sequence along a portion of the third connecting line 41, the sixth connecting line 71 and a portion of the first connecting line 21.

[0160] In addition, the cooler 20 can cool the unexpanded refrigerant by exchanging heat with the refrigerant supplied via the first pipeline 2.

[0161] The refrigerant introduced into the cooler 20 can exchange heat with the refrigerant supplied from the battery module 5 through the second pipeline 4, thereby increasing the temperature of the refrigerant.

[0162] The coolant heated in the cooler 20 can be supplied to the battery module 5 along the second pipeline 4. Therefore, the temperature of the battery module 5 can be effectively increased by the coolant heated in the cooler 20.

[0163] The refrigerant flowing through the cooler 20 can be introduced into the second heat exchanger 14 along a portion of the first connecting line 21, the fourth connecting line 51, and the open portion of the refrigerant line 11.

[0164] The fifth expansion valve 53 can expand the refrigerant, so that the expanded refrigerant is supplied to the second heat exchanger 14.

[0165] Therefore, the second heat exchanger 14 can evaporate the expanded refrigerant by exchanging heat with the air introduced from the outside.

[0166] Then, the refrigerant discharged from the second heat exchanger 14 can flow along a portion of the refrigerant line 11 and the fifth connecting line 61 through the internal heat exchanger 17a and the receiver 17 to supply the compressor 10.

[0167] When this operation is repeated, the coolant, heated by heat exchange with the refrigerant in the cooler 20, can be supplied to the battery module 5 along the second pipeline 4. Therefore, the battery module 5 can be rapidly heated by the coolant heated in the cooler 20.

[0168] In embodiments of this disclosure, reference is made to Figure 3 Detailed instructions on operating the vehicle's interior heating modes.

[0169] Figure 3 This is an operation diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure, showing the hot air heating mode for the vehicle interior.

[0170] refer to Figure 3 When the ambient air heat, the waste heat from electrical components 3, and the waste heat from battery module 5 are insufficient, the heat pump system may not recover heat.

[0171] In other words, when the vehicle interior needs to be heated in the early stages of vehicle operation, but the external temperature is low and the heat generated by electrical components 3 and battery module 5 is insufficient, the heat pump system can heat the vehicle interior by directly using high-pressure, high-temperature refrigerant.

[0172] Therefore, heating the vehicle interior using only refrigerant can be called hot air heating mode.

[0173] In embodiments of this disclosure, during the vehicle's interior hot air heating mode, coolant may not flow through the first line 2 and the second line 4. In other words, the first line 2 and the second line 4 can be shut off.

[0174] In other words, since the heat generated by electrical components 3 and battery module 5 is insufficient, coolant may not be introduced into cooler 20.

[0175] In this state, the various components of the heat pump system can operate to execute the hot air heating mode inside the vehicle. Therefore, the refrigerant can circulate along refrigerant line 11.

[0176] The portion of the refrigerant line 11 that connects the first end of the first connecting line 21 and the second end of the second connecting line 31 can be closed by the first expansion valve 15.

[0177] The portion of refrigerant line 11 that connects the first end of the second connecting line 31 and the second end of the fifth connecting line 61 can be closed by the first valve 18.

[0178] Furthermore, the portion of the refrigerant line 11 that flows through the third heat exchanger 16 and connects the second end of the second connecting line 31 to the second end of the first connecting line 21 can be opened by the third expansion valve 25.

[0179] The third expansion valve 25 allows the introduced refrigerant to flow in an expanded state.

[0180] The portion of the refrigerant line 11 that connects the second end of the first connecting line 21 and the first end of the fifth connecting line 61 can be opened by the second valve 19.

[0181] Furthermore, the portion of the refrigerant line 11 that connects the second end of the fifth connecting line 61 to the first end of the first connecting line 21 via the second heat exchanger 14 can be shut off.

[0182] The portion of the first connecting line 21 that connects the first end of the sixth connecting line 71 and the cooler 20 can be opened.

[0183] In addition, the remaining portion of the first connecting line 21 that connects the refrigerant line 11 and the sixth connecting line 71 upstream of the cooler 20 can be closed by the second expansion valve 23.

[0184] The second connecting line 31 can be closed by the fourth expansion valve 33. The fourth expansion valve 33 allows the introduced refrigerant to flow without expansion, so that the unexpanded refrigerant is introduced into the third heat exchanger 16.

[0185] Therefore, the first heat exchanger 13 and the third heat exchanger 16 can cool the refrigerant by exchanging heat with the air introduced into the HVAC module 12.

[0186] In embodiments of this disclosure, a portion of the third connecting line 41 can be opened, such that the portion of the refrigerant line 11 connected to the compressor 10 is connected to the sixth connecting line 71. Furthermore, the remainder of the third connecting line 41 can be closed by the third valve 43.

[0187] The fourth connecting line 51 can be closed by the fifth expansion valve 53. The fifth connecting line 61 can be closed by the fourth valve 63.

[0188] Furthermore, the sixth connecting line 71 can be opened by the sixth expansion valve 73. The sixth expansion valve 73 allows the introduced refrigerant to flow in an expanded state, so that the expanded refrigerant is introduced into the cooler 20.

[0189] Therefore, a portion of the refrigerant discharged from the compressor 10 can be introduced into the first heat exchanger 13 along the refrigerant line 11. Furthermore, the refrigerant flowing through the first heat exchanger 13 can be introduced into the third heat exchanger 16 along the second connecting line 31 and the open refrigerant line 11.

[0190] The refrigerant supplied to the first heat exchanger 13 and the third heat exchanger 16 respectively can increase the temperature of the air introduced into the HVAC module 12.

[0191] Air entering the HVAC module 12 from the outside can be converted to a high-temperature state as it passes through the third heat exchanger 16 and the first heat exchanger 13 in sequence and then introduced into the vehicle interior, thereby achieving heating of the vehicle interior.

[0192] The remaining refrigerant discharged from the compressor 10 can be introduced into the cooler 20 along a portion of the third connecting line 41, the sixth connecting line 71, and the open first connecting line 21.

[0193] The refrigerant that has expanded as it flows through the third expansion valve 25 from the third heat exchanger 16, and the refrigerant discharged from the cooler 20, can flow along a portion of the refrigerant line 11 through the internal heat exchanger 17a and the receiver 17 to supply the compressor 10.

[0194] The refrigerant introduced into the compressor 10 can be supplied again to the first heat exchanger 13 and the cooler 20, respectively.

[0195] In other words, in an embodiment of the present invention, when there is insufficient heat source and low external temperature in the early stages of vehicle operation, the interior of the vehicle can be heated using high-temperature refrigerant supplied from compressor 10 while repeating the above-described operation.

[0196] In embodiments of this disclosure, reference is made to Figure 4 Provide a detailed explanation of how to operate the vehicle's interior heating mode.

[0197] Figure 4 This is an operational diagram of a vehicle interior heating mode of a heat pump system for a vehicle according to an embodiment of the present disclosure.

[0198] refer to Figure 4 The coolant can circulate along the first line 2 by the operation of a water pump (not shown). The coolant may not flow through the second line 4. In other words, the second line 4 can be shut off.

[0199] Therefore, the coolant flowing through the electrical component 3 can be supplied to the cooler 20 along the first pipeline 2.

[0200] In a heat pump system, various components can be operated to heat the vehicle interior. Therefore, refrigerant can circulate along refrigerant line 11.

[0201] The portion of the refrigerant line 11 that connects the first end of the first connecting line 21 and the second end of the second connecting line 31 can be closed by the first expansion valve 15.

[0202] The portion of refrigerant line 11 that connects the first end of the second connecting line 31 and the second end of the fifth connecting line 61 can be closed by the first valve 18.

[0203] In addition, the portion of the refrigerant line 11 that connects the second end of the fourth connecting line 51 and the second end of the first connecting line 21 can be closed by the third expansion valve 25.

[0204] In addition, the portion of the refrigerant line 11 that connects the second end of the first connecting line 21 and the first end of the fifth connecting line 61 can be opened by the second valve 19.

[0205] The first connecting line 21 can be opened by the second expansion valve 23. The second expansion valve 23 can supply the refrigerant introduced through the first connecting line 21 to the cooler 20 without expansion.

[0206] The second connecting line 31 can be opened by the fourth expansion valve 33. The fourth expansion valve 33 can supply the refrigerant introduced through the second connecting line 31 to the third heat exchanger 16 without expansion.

[0207] Therefore, the first heat exchanger 13 and the third heat exchanger 16 can use the air introduced into the HVAC module 12 to cool the introduced refrigerant.

[0208] In embodiments of this disclosure, the third connecting line 41 can be closed by the third valve 43. The fourth connecting line 51 can be opened by the fifth expansion valve 53.

[0209] Therefore, a portion of the refrigerant introduced from the third heat exchanger 16 into the fourth connecting line 51 can be introduced into the second heat exchanger 14.

[0210] The remaining refrigerant from the refrigerant introduced into the fourth connecting line 51 from the third heat exchanger 16 can be introduced into the internal heat exchanger 17a along the refrigerant line 11.

[0211] The fifth expansion valve 53 can expand the refrigerant, so that the expanded refrigerant is supplied to the second heat exchanger 14, the internal heat exchanger 17a and the cooler 20 respectively.

[0212] Therefore, the second heat exchanger 14 can evaporate the expanded refrigerant by exchanging heat with externally introduced air. The second heat exchanger 14 can recover heat from the ambient air while evaporating the expanded refrigerant through heat exchange with the air.

[0213] Furthermore, the cooler 20 can evaporate the expanded refrigerant by exchanging heat with the refrigerant supplied via the first pipeline 2. The cooler 20 can recover waste heat from the electrical components 3 from the refrigerant that is heated by recovering waste heat from the electrical components 3.

[0214] The fifth connecting line 61 can be opened by the fourth valve 63. Furthermore, the sixth connecting line 71 can be closed by the sixth expansion valve 73.

[0215] Therefore, the refrigerant discharged from the second heat exchanger 14 can flow along the fifth connecting line 61, and the refrigerant discharged from the cooler 20 can flow along the first connecting line 21.

[0216] The refrigerant flowing through the first connecting line 21 and the fifth connecting line 61 can flow along the refrigerant line 11 through the internal heat exchanger 17a and the liquid receiver 17 respectively, and then be supplied to the compressor 10.

[0217] In other words, a portion of the refrigerant expanded in the fifth expansion valve 53 can be introduced into the cooler 20 along the refrigerant line 11 after flowing through the internal heat exchanger 17a.

[0218] Furthermore, the refrigerant discharged from the second heat exchanger 14 and the cooler 20 can be supplied to the compressor 10 after flowing through the internal heat exchanger 17a and the receiver 17.

[0219] In this state, the refrigerant supplied from the compressor 10 can be introduced into the first heat exchanger 13 along the refrigerant line 11. The refrigerant flowing through the first heat exchanger 13 can flow along the second connecting line 31 connected to the refrigerant line 11.

[0220] The refrigerant flowing along the second connecting line 31 can be introduced into the third heat exchanger 16 along the refrigerant line 11 connected to the third heat exchanger 16.

[0221] The first heat exchanger 13 and the third heat exchanger 16 cool the refrigerant by exchanging heat between the air introduced into the HVAC module 12 and the refrigerant. The refrigerant, which is first cooled in the first heat exchanger 13, can be further cooled in the third heat exchanger 16.

[0222] In other words, the refrigerant passing through the first heat exchanger 13 is supplied to the third heat exchanger 16 without being expanded by the fourth expansion valve 33. The third heat exchanger 16 can cool the refrigerant by exchanging heat between the air introduced into the HVAC module 12 and the refrigerant.

[0223] The refrigerant flowing through the third heat exchanger 16 can flow along the open fourth connecting line 51. The refrigerant introduced into the fourth connecting line 51 can expand by the operation of the fifth expansion valve 53.

[0224] A portion of the refrigerant expanded by the fifth expansion valve 53 can flow along the refrigerant line 11 connected to the internal heat exchanger 17a to be introduced into the internal heat exchanger 17a.

[0225] The refrigerant flowing through the internal heat exchanger 17a can flow along the refrigerant line 11 and the first connecting line 21 through the cooler 20, and then through the internal heat exchanger 17a and the receiver 17.

[0226] The remaining refrigerant in the refrigerant expanded by the fifth expansion valve 53 can flow through the second heat exchanger 14 and then along the fifth connecting line 61. The refrigerant flowing along the fifth connecting line 61 can flow together with the refrigerant flowing through the cooler 20 through the internal heat exchanger 17a and the receiver 17.

[0227] Therefore, the second heat exchanger 14 can evaporate the supplied refrigerant by exchanging heat with the air, while the cooler 20 can evaporate the supplied refrigerant by exchanging heat with the coolant.

[0228] While repeating this operation, the second heat exchanger 14 and cooler 20 can collect heat from the ambient air and waste heat from the electrical components 3.

[0229] In other words, by using the waste heat from the recovered electrical components 3 and the heat from the ambient air to raise the temperature of the refrigerant, the heat pump system can reduce the power consumption of the compressor 10 and improve heating efficiency.

[0230] In addition, the refrigerant flowing through the receiver 17 can be supplied to the compressor 10.

[0231] The refrigerant compressed to a high temperature and high pressure state in the compressor 10 can be reintroduced into the first heat exchanger 13 along the refrigerant line 11.

[0232] As described above, the refrigerant supplied to the first heat exchanger 13 and the third heat exchanger 16 respectively can increase the temperature of the air introduced into the HVAC module 12.

[0233] Therefore, air introduced from the outside can be converted into a high-temperature state while flowing sequentially through the third heat exchanger 16 and the first heat exchanger 13, and then introduced into the vehicle interior to achieve heating of the vehicle interior.

[0234] Although not shown in the figure, to recover the waste heat from battery module 5, coolant can be circulated along the second pipeline 4 by the operation of a water pump (not shown). Therefore, the coolant flowing through battery module 5 can be supplied to cooler 20 along the second pipeline 4.

[0235] In embodiments of this disclosure, reference is made to Figure 5 This section details the operation of heating battery module 5 in the vehicle's interior heating mode.

[0236] Figure 5 This is an operational diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure, used for heating a battery module in a heating mode inside the vehicle.

[0237] refer to Figure 5 The heat pump system can raise the temperature of battery module 5 by using a coolant that has exchanged heat with the refrigerant while heating the vehicle interior.

[0238] The coolant does not circulate through the first line 2. Instead, the coolant circulates along the second line 4 via the operation of a water pump (not shown).

[0239] Therefore, the coolant flowing through the battery module 5 can be supplied to the cooler 20 along the second pipeline 4.

[0240] In a heat pump system, various components can be operated to heat the vehicle interior. Therefore, refrigerant can circulate along refrigerant line 11.

[0241] The portion of the refrigerant line 11 that connects the first end of the first connecting line 21 and the second end of the second connecting line 31, as well as the portion of the refrigerant line 11 that connects the first end of the fourth connecting line 51 and the first end of the first connecting line 21, can be closed by the first expansion valve 15.

[0242] The portion of refrigerant line 11 that connects the first end of the second connecting line 31 and the second end of the fifth connecting line 61 can be closed by the first valve 18.

[0243] The portion of the refrigerant line 11 that connects the second end of the second connecting line 31 and the second end of the first connecting line 21 via the third heat exchanger 16 can be opened by the third expansion valve 25.

[0244] The third expansion valve 25 allows refrigerant introduced through refrigerant line 11 to flow without expansion.

[0245] In addition, the portion of the refrigerant line 11 that connects the second end of the first connecting line 21 and the first end of the fifth connecting line 61 can be closed by the second valve 19.

[0246] In addition, the portion of the refrigerant line 11 connected to the second heat exchanger 14 can be opened, so that the first end of the fourth connecting line 51 and the second end of the fifth connecting line 61 are connected.

[0247] The portion of the first connecting line 21 that connects the first end of the sixth connecting line 71 and the cooler 20 can be opened.

[0248] In addition, the remaining portion of the first connecting line 21 that connects the refrigerant line 11 and the sixth connecting line 71 upstream of the cooler 20 can be closed by the second expansion valve 23.

[0249] The second connecting line 31 can be opened by the fourth expansion valve 33.

[0250] The fourth expansion valve 33 allows refrigerant introduced through the second connecting line 31 to flow without expansion.

[0251] In addition, a portion of the third connecting line 41 can be opened, so that the portion of the refrigerant line 11 connected to the compressor 10 is connected to the sixth connecting line 71.

[0252] The remainder of the third connecting line 41 can be shut off by the third valve 43.

[0253] The fourth connecting line 51 can be opened by the fifth expansion valve 53.

[0254] The fifth expansion valve 53 can expand the refrigerant introduced through the fourth connecting line 51. The refrigerant expanded by the fifth expansion valve 53 can then be introduced into the second heat exchanger 14.

[0255] The fifth connecting line 61 can be opened by the fourth valve 63. Furthermore, the sixth connecting line 71 can be opened by the sixth expansion valve 73.

[0256] The sixth expansion valve 73 allows refrigerant introduced through the sixth connecting line 71 to flow without expansion. Therefore, the refrigerant discharged from the sixth expansion valve 73 can be supplied to the cooler 20 in an unexpanded state.

[0257] Therefore, a portion of the refrigerant discharged from the compressor 10 can be introduced into the first heat exchanger 13 along the refrigerant line 11. Furthermore, the refrigerant flowing through the first heat exchanger 13 can be introduced into the third heat exchanger 16 along the second connecting line 31 and the open refrigerant line 11.

[0258] The refrigerant supplied to the first heat exchanger 13 and the third heat exchanger 16 respectively can increase the temperature of the air introduced into the HVAC module 12.

[0259] Air introduced from the outside into the HVAC module 12 can be converted to a high-temperature state and introduced into the vehicle interior as it passes through the third heat exchanger 16 and the first heat exchanger 13 in sequence, thereby achieving heating of the vehicle interior.

[0260] The remaining refrigerant discharged from the compressor 10 can be introduced into the cooler 20 along a portion of the third connecting line 41, the sixth connecting line 71, and the open first connecting line 21.

[0261] The refrigerant introduced into the cooler 20 can increase the temperature of the coolant when it exchanges heat with the coolant supplied from the battery module 5 through the second pipeline 4.

[0262] The coolant heated in the cooler 20 can be supplied to the battery module 5 along the second pipeline 4. Therefore, the temperature of the battery module 5 can be effectively increased using the coolant heated in the cooler 20.

[0263] The refrigerant flowing through the third heat exchanger 16 and the refrigerant from the cooler 20 flowing through the third expansion valve 25 can flow along the fourth connecting line 51 and a portion of the refrigerant line 11 to supply the second heat exchanger 14.

[0264] The fifth expansion valve 53 can expand the refrigerant, so that the expanded refrigerant is supplied to the second heat exchanger 14.

[0265] Therefore, the second heat exchanger 14 can evaporate the expanded refrigerant by exchanging heat with the air introduced from the outside.

[0266] The refrigerant discharged from the second heat exchanger 14 can flow along a portion of the refrigerant line 11 and the fifth connecting line 61 through the internal heat exchanger 17a and the receiver 17, and then be supplied to the compressor 10.

[0267] The refrigerant compressed to a high temperature and high pressure state in the compressor 10 can be supplied again to the first heat exchanger 13 and the cooler 20, respectively.

[0268] As described above, the refrigerant supplied to the first heat exchanger 13 and the third heat exchanger 16 respectively can increase the temperature of the air introduced into the HVAC module 12.

[0269] Therefore, air introduced from the outside can be converted into a high-temperature state while flowing sequentially through the third heat exchanger 16 and the first heat exchanger 13, and then introduced into the vehicle interior to achieve heating of the vehicle interior.

[0270] The coolant, heated by heat exchange with the refrigerant in the cooler 20, can be supplied to the battery module 5 along the second pipeline 4. Therefore, the battery module 5 can be rapidly heated by the coolant heated in the cooler 20.

[0271] In embodiments of this disclosure, reference is made to Figure 6 Provide a detailed explanation of how to operate the vehicle's interior heating and dehumidification modes.

[0272] Figure 6 This is an operation diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure, based on a heating and dehumidification mode inside the vehicle.

[0273] refer to Figure 6 The coolant may not flow through the first pipeline 2 and the second pipeline 4. In other words, the first pipeline 2 and the second pipeline 4 can be shut off.

[0274] In this state, the various components of the heat pump system can operate to heat and dehumidify the vehicle interior. Therefore, the refrigerant can circulate along refrigerant line 11.

[0275] The portion of the refrigerant line 11 that connects the first end of the first connecting line 21 and the second end of the second connecting line 31 can be closed by the first expansion valve 15.

[0276] In addition, the first end of the refrigerant line 11 that connects to the second connecting line 31 and the second heat exchanger 14 can be closed by the first valve 18.

[0277] The portion of the refrigerant line 11 that connects the third heat exchanger 16 and the receiver 17 can be opened by the second valve 19 and the third expansion valve 25.

[0278] The third expansion valve 25 allows the introduced refrigerant to flow without expansion.

[0279] Furthermore, the portion of the refrigerant line 11 that connects the second heat exchanger 14 to the internal heat exchanger 17a and the first end of the first connecting line 21 can be shut off.

[0280] The first connecting line 21 can be closed by the second expansion valve 23. The second connecting line 31 can be opened by the fourth expansion valve 33.

[0281] The fourth expansion valve 33 can expand the refrigerant introduced from the first heat exchanger 13 through the second connecting line 31. Then, the fourth expansion valve 33 can supply the expanded refrigerant to the third heat exchanger 16.

[0282] Therefore, the first heat exchanger 13 can use the air introduced into the HVAC module 12 to cool the introduced refrigerant.

[0283] In addition, the third heat exchanger 16 can recover heat from the ambient air while evaporating the expanded refrigerant through heat exchange with the air introduced into the HVAC module 12.

[0284] In other words, because the heat pump system uses recovered ambient air heat to raise the temperature of the refrigerant, the power consumption of the compressor 10 is reduced and the heating efficiency is improved.

[0285] In embodiments of this disclosure, the third connecting line 41 can be closed by the third valve 43. The fourth connecting line 51 can be closed by the fifth expansion valve 53.

[0286] Furthermore, the fifth connecting line 61 can be closed by the fourth valve 63. Additionally, the sixth connecting line 71 can be closed by the sixth expansion valve 73.

[0287] Therefore, the refrigerant discharged from the compressor 10 or the refrigerant discharged from the first heat exchanger 13 may not be introduced into the second heat exchanger 14.

[0288] In other words, the refrigerant discharged from the compressor 10 can be introduced into the first heat exchanger 13 along a portion of the refrigerant line 11. The refrigerant flowing through the first heat exchanger 13 can flow along the second connecting line 31 connected to the refrigerant line 11.

[0289] The refrigerant flowing along the second connecting line 31 can be expanded by the operation of the fourth expansion valve 33. The expanded refrigerant can then be introduced into the third heat exchanger 16.

[0290] The refrigerant flowing through the third heat exchanger 16 can flow along the open portion of the refrigerant line 11 through the internal heat exchanger 17a and the receiver 17.

[0291] In addition, the refrigerant flowing through the receiver 17 can be supplied to the compressor 10.

[0292] Furthermore, the refrigerant compressed to a high temperature and high pressure state in the compressor 10 can be introduced into the first heat exchanger 13 along the refrigerant line 11.

[0293] As described above, the refrigerant supplied to the first heat exchanger 13 can increase the temperature of the air introduced into the HVAC module 12.

[0294] In other words, the air introduced into the HVAC module 12 can be dehumidified by the low-temperature refrigerant introduced into the third heat exchanger 16 while flowing through it. Then, the air is converted to a high-temperature state while flowing through the first heat exchanger 13 and introduced into the vehicle interior, thereby successfully heating and dehumidifying the vehicle interior.

[0295] In addition, refer to Figure 7 This section details the operation of cooling battery module 5 under the vehicle's internal cooling modes.

[0296] Figure 7 This is an operational diagram of a heat pump system for a vehicle according to an embodiment of the present disclosure, used for cooling a battery module in a cooling mode inside the vehicle.

[0297] refer to Figure 7 The coolant can circulate along the first pipeline 2 by the operation of a water pump (not shown). The coolant can also circulate along the second pipeline 4 by the operation of a water pump (not shown).

[0298] In other words, the coolant flowing through the electrical component 3 can be supplied to the cooler 20 along the first pipeline 2, and the coolant flowing through the battery module 5 can be supplied to the cooler 20 along the second pipeline 4.

[0299] In a heat pump system, various components can be operated to cool the vehicle interior. Therefore, refrigerant can circulate along refrigerant line 11.

[0300] The portion of the refrigerant line 11 connecting the compressor 10 and the first heat exchanger 13, as well as the portion of the refrigerant line 11 connecting the first heat exchanger 13 and the second heat exchanger 14, can be closed by the first valve 18.

[0301] The portion of the refrigerant line 11 that connects the second end of the first connecting line 21 and the first end of the fifth connecting line 61 can be opened by the second valve 19.

[0302] The second end of the refrigerant line 11, which connects to the third connecting line 41, and the portion connecting to the second heat exchanger 14 can be opened.

[0303] The portion of the refrigerant line 11 that connects the second heat exchanger 14 and the third heat exchanger 16 can be opened by the first expansion valve 15.

[0304] In addition, the portion of the refrigerant line 11 that connects the third heat exchanger 16 and the compressor 10 can be opened by the third expansion valve 25.

[0305] The third expansion valve 25 allows the introduced refrigerant to flow without expansion.

[0306] The first connecting line 21 can be opened by the second expansion valve 23 for cooling the electrical components 3 and the battery module 5.

[0307] Therefore, the coolant flowing through the battery module 5 can be supplied to the cooler 20 along the second pipeline 4.

[0308] The second expansion valve 23 can expand the refrigerant introduced through the first connecting line 21 and allow the expanded refrigerant to flow into the cooler 20, so that the battery module 5 can be cooled by the coolant that has exchanged heat with the refrigerant in the cooler 20.

[0309] Therefore, the coolant flowing through the cooler 20 can be cooled by exchanging heat with the expanded refrigerant supplied to the cooler 20.

[0310] In other words, the coolant flowing through the cooler 20 can be cooled by exchanging heat with the expanded refrigerant supplied to the cooler 20. The coolant cooled in the cooler 20 can be supplied to the battery module 5 along the second pipeline 4. Therefore, the battery module 5 can be effectively cooled using the coolant cooled in the cooler 20.

[0311] The second connecting line 31 can be closed by the fourth expansion valve 33. The third connecting line 41 can be closed by the third valve 43.

[0312] Furthermore, the fourth connecting line 51 can be closed by the fifth expansion valve 53. The fifth connecting line 61 can be closed by the fourth valve 63. Furthermore, the sixth connecting line 71 can be closed by the sixth expansion valve 73.

[0313] In this state, the refrigerant discharged from the compressor 10 can flow along the third connecting line 41 without passing through the first heat exchanger 13.

[0314] In other words, the refrigerant discharged from the compressor 10 can flow along the third connecting line 41 and can be introduced into the second heat exchanger 14 along the portion of the refrigerant line 11 connected to the second heat exchanger 14.

[0315] The second heat exchanger 14 can first cool the refrigerant by using air introduced from the outside.

[0316] The refrigerant discharged from the second heat exchanger can be introduced into the internal heat exchanger 17a along the refrigerant line 11. The internal heat exchanger 17a can further cool the refrigerant by exchanging heat between the refrigerant supplied from the second heat exchanger 14 and the refrigerants supplied from the third heat exchanger 16 and the cooler 20, respectively.

[0317] A portion of the refrigerant discharged from the internal heat exchanger 17a can be introduced into the cooler 20 along the first connecting line 21.

[0318] The refrigerant introduced into the cooler 20 can exchange heat with the refrigerant supplied through the second line 4, and can flow through the internal heat exchanger 17a and the receiver 17 via the refrigerant line 11 connected to the first connecting line 21, and can then be introduced into the compressor 10.

[0319] In addition, the remaining refrigerant discharged from the internal heat exchanger 17a can be introduced into the first expansion valve 15 along the refrigerant line 11 to cool the interior of the vehicle.

[0320] The first expansion valve 15 can expand the refrigerant introduced through the refrigerant line 11 and allow the expanded refrigerant to flow into the third heat exchanger 16.

[0321] The refrigerant flowing through the third heat exchanger 16 can flow sequentially along the refrigerant line 11 through the internal heat exchanger 17a, the receiver 17, and the compressor 10.

[0322] In other words, the refrigerant discharged from the cooler 20 and the refrigerant discharged from the third heat exchanger 16 can flow along the refrigerant line 11 through the internal heat exchanger 17a and the receiver 17, and then be supplied to the compressor 10.

[0323] The air introduced into the HVAC module 20 can be cooled by the cryogenic refrigerant introduced into the third heat exchanger 16 as it flows through the third heat exchanger 16.

[0324] Cooled air can be introduced directly into the vehicle to cool the interior.

[0325] As the coolant flows sequentially through the second heat exchanger 14 and the internal heat exchanger 17a, the cooling level can be increased and supplied to the third heat exchanger 16.

[0326] In other words, in the embodiments of this disclosure, the second heat exchanger 14 can cool the refrigerant by exchanging heat with air, and the internal heat exchanger 17a can further cool the refrigerant by exchanging heat with low-temperature refrigerant.

[0327] Through this operation, the heat pump system can cool the R744 refrigerant, which is formed from carbon dioxide, more effectively, thereby ensuring that the refrigerant has a larger phase change heat transfer range.

[0328] Furthermore, since the refrigerant with a larger phase change heat transfer range is ensured to evaporate in the third heat exchanger 16, the temperature of the air flowing through the third heat exchanger 16 can be further reduced, thereby improving cooling performance and efficiency.

[0329] While repeating the above process, in the vehicle's interior cooling mode, the refrigerant can cool the vehicle interior, and at the same time, cool the coolant as it flows through the cooler 20.

[0330] The cryogenic coolant cooled in cooler 20 can be introduced into battery module 5 through second line 4. Therefore, battery module 5 can be effectively cooled using the supplied cryogenic coolant.

[0331] Therefore, as described above, when a heat pump system for a vehicle according to an embodiment of this disclosure is applied, natural refrigerants can be used to cool or heat the vehicle interior, thereby enabling it to comply with environmental regulations and improving the overall marketability of the vehicle.

[0332] Furthermore, according to this disclosure, when cooling and heating the vehicle interior, cooling and heating performance can be maximized by operating the refrigerant in the supercritical and subcritical regions where the pressure and / or temperature of the refrigerant is above the critical pressure and / or temperature, and by using R744 refrigerant as a natural refrigerant that utilizes carbon dioxide.

[0333] Furthermore, according to this disclosure, by using a single cooler 20 in which coolant and refrigerant exchange heat with each other, the temperature of the battery module 5 can be effectively regulated according to the vehicle mode, thereby achieving system streamlining and simplification.

[0334] Furthermore, according to this disclosure, by effectively regulating the temperature of the battery module 5, the optimal performance of the battery module 5 can be obtained, and the overall driving range of the vehicle can be increased through effective management of the battery module 5.

[0335] Furthermore, according to this disclosure, even when the external temperature is low and the heat generated by the electrical components 3 and the battery module 5 is insufficient, the high-temperature refrigerant compressed in the compressor 10 can be used to heat the interior of the vehicle.

[0336] Furthermore, according to this disclosure, by using a coolant that is heated through heat exchange with the refrigerant to heat the battery module 5, a separate coolant heater for heating the battery module 5 can be eliminated, and the power consumption for increasing the temperature of the battery module 5 is minimized.

[0337] Furthermore, according to this disclosure, by streamlining the entire system, manufacturing costs and weight can be reduced, and space utilization can be improved.

[0338] Although this disclosure has been described in conjunction with actual embodiments presently believed to be embodiments of this disclosure, it should be understood that this disclosure is not limited to the disclosed embodiments. Rather, this disclosure is intended to cover various modifications and equivalents included within the spirit and scope of the invention.

[0339] Explanation of reference numerals in the attached figures

[0340] 2, 4: First pipeline and second pipeline

[0341] 3: Electrical components

[0342] 5: Battery Module

[0343] 10: Compressor

[0344] 11: Refrigerant Piping

[0345] 12: HVAC Module

[0346] 13, 14, 16: First heat exchanger, second heat exchanger, and third heat exchanger

[0347] 15: First expansion valve

[0348] 17: Liquid reservoir

[0349] 17a: Internal heat exchanger

[0350] 18, 19: First valve and second valve

[0351] 20: Cooler

[0352] 21: First connecting pipeline

[0353] 23: Second expansion valve

[0354] 25: Third expansion valve

[0355] 31: Second connecting pipeline

[0356] 33: Fourth expansion valve

[0357] 41: Third connecting pipeline

[0358] 43: Third valve

[0359] 51: Fourth connecting pipeline

[0360] 53: Fifth expansion valve

[0361] 61: Fifth connecting pipeline

[0362] 63: Fourth valve

[0363] 71: Sixth connecting pipeline

[0364] 73: Sixth expansion valve.

Claims

1. A heat pump system for a vehicle, the heat pump system comprising: The compressor, first heat exchanger, second heat exchanger, first expansion valve, and third heat exchanger are connected by refrigerant pipelines to circulate the refrigerant. A cooler connected to the refrigerant line via a first connecting line is configured to regulate the temperature of the coolant by heat exchange between the refrigerant and the coolant. A second expansion valve is installed in the first connecting pipeline; A third expansion valve is installed on the refrigerant pipeline between the third heat exchanger and the compressor; The second connecting pipeline includes: The first end of the refrigerant line connected between the first heat exchanger and the second heat exchanger; and The second end of the refrigerant line connected between the second heat exchanger and the third heat exchanger; The fourth expansion valve is installed on the second connecting pipeline; The third connecting pipeline includes: The first end of the refrigerant line connected between the compressor and the first heat exchanger; and The second end of the refrigerant line connected between the first heat exchanger and the second heat exchanger; and The fourth connecting pipeline includes: The first end of the refrigerant line connected between the second heat exchanger and the third heat exchanger; and The second end of the refrigerant line connected between the third heat exchanger and the third expansion valve.

2. The heat pump system according to claim 1, further comprising: The first valve is installed on the refrigerant pipeline between the first heat exchanger and the second heat exchanger; A second valve is installed on the refrigerant pipeline between the third expansion valve and the compressor; The third valve installed on the third connecting pipeline; and The fifth expansion valve is installed on the fourth connecting pipeline.

3. The heat pump system according to claim 2, further comprising: The fifth connecting pipeline includes: The first end of the refrigerant line connected between the third expansion valve and the compressor; and The second end of the refrigerant line connected between the first heat exchanger and the second heat exchanger; The fourth valve is installed on the fifth connecting pipeline; The sixth connecting pipeline includes: The first end of the first connecting line between the second expansion valve and the cooler; and The second end of the third connecting line is connected to the third connecting line; and The sixth expansion valve is installed on the sixth connecting pipeline.

4. The heat pump system according to claim 3, further comprising: A liquid receiver is installed on the refrigerant pipeline between the third heat exchanger and the compressor; and An internal heat exchanger is disposed inside the receiver, the internal heat exchanger being configured to exchange heat between refrigerant supplied from the second heat exchanger and refrigerant supplied from the third heat exchanger. The internal heat exchanger is configured to supply the refrigerant with a higher temperature from the refrigerant after heat exchange to the third heat exchanger.

5. The heat pump system according to claim 4, wherein, When heating the battery module: The portion of the refrigerant line connecting the compressor and the first heat exchanger, and the portion of the refrigerant line connecting the first heat exchanger and the second heat exchanger, are configured to be closed by the first valve; The portion of the refrigerant line connecting the first end of the fifth connecting line and the compressor is configured to be open; The portion of the refrigerant line connected to the second heat exchanger is configured to be open, such that the first end of the fourth connecting line and the second end of the fifth connecting line are connected; The portion of the refrigerant pipeline that connects the second end of the first connecting pipeline and the second end of the fourth connecting pipeline is configured to be opened by the third expansion valve; The portion of the refrigerant pipeline connecting the second end of the first connecting pipeline and the first end of the fifth connecting pipeline is configured to be closed by the second valve; The portion of the first connecting line that connects the first end of the sixth connecting line and the cooler is configured to be open; The remaining portion of the first connecting pipeline, which connects the refrigerant pipeline and the sixth connecting pipeline at the upstream end of the cooler, is configured to be closed by the second expansion valve; The second connecting line is configured to be closed by the fourth expansion valve; A portion of the third connecting line is configured to be opened, such that the portion of the refrigerant line connected to the compressor is connected to the sixth connecting line; The remaining portion of the third connecting pipeline is configured to be closed by the third valve; The fourth connecting line is configured to be opened by the fifth expansion valve; The fifth connecting pipeline is configured to be opened by the fourth valve; and The sixth connecting line is configured to be opened by the sixth expansion valve.

6. The heat pump system according to claim 5, wherein: The third expansion valve and the sixth expansion valve are configured to allow refrigerant to flow without expansion; The fifth expansion valve is configured to allow refrigerant to flow in an expanded state; The refrigerant discharged from the compressor flows sequentially through a portion of the third connecting line, the sixth connecting line, and a portion of the first connecting line, and is introduced into the cooler; The refrigerant flowing through the cooler passes through a portion of the first connecting line, the fourth connecting line, and the opened portion of the refrigerant line, and is introduced into the second heat exchanger; and The refrigerant discharged from the second heat exchanger flows through a portion of the refrigerant line and the fifth connecting line through the internal heat exchanger and the receiver, and is supplied to the compressor.

7. The heat pump system according to claim 4, wherein, In the vehicle's interior heating mode: The portion of the refrigerant pipeline connecting the first end of the first connecting pipeline and the second end of the second connecting pipeline is configured to be closed by the first expansion valve; The portion of the refrigerant pipeline connecting the first end of the second connecting pipeline and the second end of the fifth connecting pipeline is configured to be closed by the first valve; The portion of the refrigerant pipeline that connects the second end of the second connecting pipeline to the second end of the first connecting pipeline via the third heat exchanger is configured to be opened by the third expansion valve. The portion of the refrigerant pipeline connecting the second end of the first connecting pipeline and the first end of the fifth connecting pipeline is configured to be opened by the second valve; The portion of the refrigerant pipeline that connects the second end of the fifth connecting pipeline to the first end of the first connecting pipeline via the second heat exchanger is configured to be closed; The portion of the first connecting line that connects the first end of the sixth connecting line and the cooler is configured to be open; The remaining portion of the first connecting pipeline, which connects the refrigerant pipeline and the sixth connecting pipeline at the upstream end of the cooler, is configured to be closed by the second expansion valve; The second connecting line is configured to be opened by the fourth expansion valve; A portion of the third connecting line is configured to be opened, such that the portion of the refrigerant line connected to the compressor is connected to the sixth connecting line; The remaining portion of the third connecting pipeline is configured to be closed by the third valve; The fourth connecting line is configured to be closed by the fifth expansion valve; The fifth connecting pipeline is configured to be closed by the fourth valve; and The sixth connecting line is configured to be opened by the sixth expansion valve.

8. The heat pump system according to claim 7, wherein: The third expansion valve and the sixth expansion valve are configured to allow refrigerant to flow in an expanded state; The fourth expansion valve is configured to allow refrigerant to flow without expansion; A portion of the refrigerant discharged from the compressor flows through the refrigerant line and is introduced into the first heat exchanger; The refrigerant flowing through the first heat exchanger flows through the second connecting line and the open refrigerant line, and is introduced into the third heat exchanger; The remaining refrigerant discharged from the compressor flows through a portion of the third connecting line, the sixth connecting line, and the open first connecting line, and is introduced into the cooler; and The refrigerant from the third heat exchanger flowing through the third expansion valve and the refrigerant discharged from the cooler flow along a portion of the coolant line through the internal heat exchanger and the receiver, and are supplied to the compressor.

9. The heat pump system according to claim 4, wherein, In the vehicle's heating mode: The portion of the refrigerant pipeline connecting the first end of the first connecting pipeline and the second end of the second connecting pipeline is configured to be closed by the first expansion valve; The portion of the refrigerant pipeline connecting the first end of the second connecting pipeline and the second end of the fifth connecting pipeline is configured to be closed by the first valve; The portion of the refrigerant pipeline that connects the second end of the fourth connecting pipeline and the second end of the first connecting pipeline is configured to be closed by the third expansion valve; The portion of the refrigerant pipeline connecting the second end of the first connecting pipeline and the first end of the fifth connecting pipeline is configured to be opened by the second valve; The first connecting line is configured to be opened by the second expansion valve; The second connecting line is configured to be opened by the fourth expansion valve; The third connecting pipeline is configured to be closed by the third valve; The fourth connecting line is configured to be opened by the fifth expansion valve; The fifth connecting pipeline is configured to be opened by the fourth valve; and The sixth connecting line is configured to be closed by the sixth expansion valve.

10. The heat pump system according to claim 9, wherein: The second expansion valve and the fourth expansion valve are configured to allow refrigerant to flow without expansion; The fifth expansion valve is configured to allow refrigerant to flow in an expanded state, such that the refrigerant expanded by the fifth expansion valve is supplied to the second heat exchanger, the internal heat exchanger, and the cooler; A portion of the refrigerant introduced from the third heat exchanger into the fourth connecting pipeline is introduced into the second heat exchanger; and The remaining refrigerant from the refrigerant introduced into the fourth connecting pipeline from the third heat exchanger is introduced into the internal heat exchanger.

11. The heat pump system according to claim 9, wherein: A portion of the refrigerant discharged from the fifth expansion valve flows along the refrigerant line through the internal heat exchanger and is introduced into the cooler; and The refrigerant discharged from the second heat exchanger and the cooler flows through the internal heat exchanger and the liquid receiver, and is supplied to the compressor.

12. The heat pump system according to claim 4, wherein, When heating the battery module is required in the vehicle's interior heating mode: The portion of the refrigerant pipeline connecting the first end of the first connecting pipeline and the second end of the second connecting pipeline, and the portion of the refrigerant pipeline connecting the first end of the fourth connecting pipeline and the first end of the first connecting pipeline, are configured to be closed by the first expansion valve. The portion of the refrigerant pipeline connecting the first end of the second connecting pipeline and the second end of the fifth connecting pipeline is configured to be closed by the first valve; The portion of the refrigerant pipeline that connects the second end of the second connecting pipeline and the second end of the first connecting pipeline via the third heat exchanger is configured to be opened by the third expansion valve. The portion of the refrigerant pipeline connecting the second end of the first connecting pipeline and the first end of the fifth connecting pipeline is configured to be closed by the second valve; The portion of the refrigerant line connected to the second heat exchanger is configured to be open, such that the first end of the fourth connecting line and the second end of the fifth connecting line are connected; The portion of the first connecting line that connects the first end of the sixth connecting line and the cooler is configured to be open; The remaining portion of the first connecting pipeline, which connects the refrigerant pipeline and the sixth connecting pipeline at the upstream end of the cooler, is configured to be closed by the second expansion valve; The second connecting line is configured to be opened by the fourth expansion valve; A portion of the third connecting line is configured to be opened, such that the portion of the refrigerant line connected to the compressor is connected to the sixth connecting line; The remaining portion of the third connecting pipeline is configured to be closed by the third valve; The fourth connecting line is configured to be opened by the fifth expansion valve; The fifth connecting pipeline is configured to be opened by the fourth valve; and The sixth connecting line is configured to be opened by the sixth expansion valve.

13. The heat pump system according to claim 12, wherein: The third expansion valve, the fourth expansion valve, and the sixth expansion valve are configured to allow refrigerant to flow without expansion; The fifth expansion valve is configured to allow refrigerant to flow in an expanded state; A portion of the refrigerant discharged from the compressor is introduced into the first heat exchanger along the refrigerant pipeline; The refrigerant flowing through the first heat exchanger is introduced into the third heat exchanger along the second connecting line and the open refrigerant line; The remaining refrigerant from the refrigerant discharged from the compressor is introduced into the cooler along a portion of the third connecting line, the sixth connecting line, and the opened first connecting line; The refrigerant flowing through the third heat exchanger and the refrigerant from the cooler flowing through the third expansion valve are introduced into the second heat exchanger along a portion of the refrigerant line and the fourth connecting line; The refrigerant discharged from the second heat exchanger flows along the open portion of the refrigerant line and the fifth connecting line through the internal heat exchanger and the receiver to supply the compressor.

14. The heat pump system according to claim 4, wherein, In the vehicle's interior heating and dehumidification mode: The portion of the refrigerant pipeline connecting the first end of the first connecting pipeline and the second end of the second connecting pipeline is configured to be closed by the first expansion valve; The portion of the refrigerant pipeline that connects the first end of the second connecting pipeline and the second heat exchanger is configured to be closed by the first valve. The portion of the refrigerant pipeline connecting the third heat exchanger and the liquid receiver is configured to be opened by the second valve and the third expansion valve; The portion of the refrigerant line that connects the second heat exchanger to the internal heat exchanger and the first end of the first connecting line is configured to be closed; The first connecting line is configured to be closed by the second expansion valve; The second connecting line is configured to be opened by the fourth expansion valve; The third connecting pipeline is configured to be closed by the third valve; The fourth connecting line is configured to be closed by the fifth expansion valve; The fifth connecting pipeline is configured to be closed by the fourth valve; and The sixth connecting line is configured to be closed by the sixth expansion valve.

15. The heat pump system according to claim 14, wherein: The third expansion valve is configured to allow refrigerant to flow without expansion; The fourth expansion valve is configured to allow refrigerant introduced from the first heat exchanger through the second connecting line to flow in an expanded state. The refrigerant discharged from the compressor is introduced into the first heat exchanger along a portion of the refrigerant pipeline; The refrigerant flowing through the first heat exchanger is introduced into the third heat exchanger along the second connecting line and the opened refrigerant line; and The refrigerant from the third heat exchanger flows through the third expansion valve along the opened portion of the refrigerant line through the internal heat exchanger and the receiver to supply the compressor.

16. The heat pump system according to claim 4, when cooling the battery module is required in the vehicle's interior cooling mode: The portion of the refrigerant line connecting the compressor and the first heat exchanger, and the portion of the refrigerant line connecting the first heat exchanger and the second heat exchanger, are configured to be closed by the first valve; The portion of the refrigerant line that connects the second end of the third connecting line and the second heat exchanger is configured to be open; The portion of the refrigerant line connecting the second heat exchanger and the third heat exchanger is configured to be opened by the first expansion valve; The portion of the refrigerant line connecting the third heat exchanger and the compressor is configured to be opened by the third expansion valve; The portion of the refrigerant pipeline connecting the second end of the first connecting pipeline and the first end of the fifth connecting pipeline is configured to be opened by the second valve; The first connecting line is configured to be opened by the second expansion valve; The second connecting line is configured to be closed by the fourth expansion valve; The third connecting pipeline is configured to be opened by the third valve; The fourth connecting line is configured to be closed by the fifth expansion valve; The fifth connecting pipeline is configured to be closed by the fourth valve; and The sixth connecting line is configured to be closed by the sixth expansion valve.

17. The heat pump system according to claim 16, wherein: The first expansion valve is configured to allow refrigerant to flow in an expanded state; The second expansion valve is configured to allow the refrigerant to flow in an expanded state, so that the battery module is cooled by the refrigerant that has exchanged heat with the refrigerant in the cooler; The third expansion valve is configured to allow refrigerant to flow without expansion; The refrigerant discharged from the compressor flows along the third connecting line and a portion of the refrigerant line through the second heat exchanger to be introduced into the internal heat exchanger; A portion of the refrigerant discharged from the internal heat exchanger is introduced into the cooler along the first connecting pipe; The remaining refrigerant from the refrigerant discharged from the internal heat exchanger is introduced into the first expansion valve along the refrigerant line; and The refrigerant discharged from the cooler and the refrigerant discharged from the third heat exchanger flow along the refrigerant line through the internal heat exchanger and the receiver to supply the compressor.

18. The heat pump system according to claim 1, wherein, The second and third heat exchangers are configured to cool or evaporate the refrigerant inside.

19. The heat pump system according to claim 1, wherein: The first end of the first connecting pipeline is connected to the refrigerant pipeline between the second heat exchanger and the first expansion valve; and The second end of the first connecting line is connected to the refrigerant line between the third heat exchanger and the compressor.

20. The heat pump system according to claim 1, wherein: The first heat exchanger, the second heat exchanger, and the third heat exchanger are air-cooled gas cooling devices configured to exchange heat between the refrigerant and air; and The cooler is a water-cooled gas cooling device configured to exchange heat between the refrigerant and the coolant.

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