Thermal management system for vehicle

Abstract

An embodiment provides a thermal management system for a vehicle, comprising: a refrigerant circulation line through which a refrigerant moves while sequentially passing through a compressor and an indoor unit; and a cooling water circulation line through which cooling water moves, wherein a heat exchanger connected to the cooling water circulation line is disposed between the compressor and the indoor unit in the refrigerant circulation line so that the refrigerant heat-exchanged with the cooling water flows into the indoor unit.

Description

Thermal management system for vehicles

[0001] The present invention relates to a thermal management system for a vehicle.

[0002] Vehicle air conditioning systems use heat pump systems that can selectively cool and heat the vehicle's interior using a refrigerant cycle.

[0003] Heat pump systems for battery-powered vehicles, such as electric vehicles, are designed to improve heat pump system performance by recovering both electrical and battery waste heat through heat exchange between refrigerant and coolant. These heat pump systems have a simple configuration, and their performance varies depending on the control of the flow of refrigerant and coolant. Therefore, methods to improve performance and efficiency are in demand, and research into these areas is ongoing.

[0004] The problem to be solved by the present invention is to provide a vehicle thermal management system capable of improving cooling and heating performance and efficiency.

[0005] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0006] A vehicle thermal management system according to an embodiment of the present invention includes a refrigerant circulation line through which refrigerant sequentially passes through a compressor and an indoor unit, and a coolant circulation line through which coolant moves, and a heat exchanger connected to the coolant circulation line is arranged between the compressor and the indoor unit in the refrigerant circulation line so that the refrigerant that has exchanged heat with the coolant is introduced into the indoor unit.

[0007] The above heat exchanger may be provided in a structure that forms an integral part with the compressor.

[0008] The above refrigerant circulation line may include a first refrigerant line in which a first expansion valve, an outdoor unit, a second expansion valve, an evaporator, and an accumulator are installed, through which the refrigerant passing through the indoor unit sequentially passes; and a second refrigerant line through which the refrigerant passing through the outdoor unit moves by bypassing the second expansion valve and the evaporator.

[0009] A third expansion valve and chiller may be installed in the second refrigerant line.

[0010] The second refrigerant line may have one end connected to the first refrigerant line between the outdoor unit and the second expansion valve, and the other end connected to the first refrigerant line between the evaporator and the accumulator.

[0011] The indoor unit further includes a third refrigerant line, the first end of which is connected to the first refrigerant line at the inlet end of the indoor unit, and the other end is connected to the first refrigerant line at the inlet end of the accumulator, and a fourth expansion valve may be installed in the third refrigerant line.

[0012] The system may further include an internal heat exchanger installed in the first refrigerant line to exchange heat between the refrigerant moving through the outdoor unit and the refrigerant moving through the accumulator to the compressor.

[0013] The indoor unit and the evaporator are installed inside the air conditioning unit, and a temperature control door may be provided between the indoor unit and the evaporator.

[0014] The above coolant circulation line may include a first coolant line through which coolant passing through the electrical component is circulated and a radiator is disposed; a second coolant line through which coolant passing through the battery is circulated and a heater is disposed; a coolant valve selectively connecting the first coolant line and the second coolant line; a coolant branch line having one end connected to the second coolant line through the coolant valve at the inlet-side front end of the battery and the other end connected to the second coolant line at the outlet-side rear end of the battery; and a coolant connection line having one end connected to the first coolant line at the outlet-side rear end of the electrical component and the other end connected to the second coolant line at the outlet-side rear end of the battery.

[0015] The first cooling water line may be connected to the heat exchanger, and the second cooling water line may be connected to the chiller.

[0016] In the first cooling mode, the first cooling water line implements an independent cooling water circulation loop so that the cooling water of the first cooling water line moves through the heat exchanger, the second cooling water line is configured so that the cooling water does not move, and the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger, exchanges heat with the cooling water of the first cooling water line, and then moves to the indoor unit, and is configured so that, while the third expansion valve is closed, it passes through the first expansion valve, the outdoor unit, the second expansion valve, the evaporator, and the accumulator, and then flows into the compressor.

[0017] In the second cooling mode, the first cooling water line and the second cooling water line each implement independent cooling water circulation loops, and the cooling water of the first cooling water line is configured to move through the heat exchanger and the cooling water of the second cooling water line is configured to move through the chiller, the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger, exchanges heat with the cooling water of the first cooling water line, and then moves to the indoor unit, and a portion of the refrigerant that has passed through the first expansion valve and the outdoor unit passes through the third expansion valve and the chiller along the second refrigerant line, exchanges heat with the cooling water of the second cooling water line, and then flows into the compressor through the accumulator, and the remainder of the refrigerant may be configured to flow into the compressor after passing through the second expansion valve, the evaporator, and the accumulator along the first refrigerant line.

[0018] In the first heating mode, the cooling water circulation line is configured so that the cooling water does not move, and the refrigerant of the first refrigerant line is discharged from the compressor and passes through the heat exchanger, the indoor unit, the first expansion valve, and the outdoor unit, and then passes through the third expansion valve and the chiller along the second refrigerant line while the second expansion valve is closed, and then flows into the compressor via the accumulator.

[0019] In the second heating mode, the cooling water passing through the electrical component in the first cooling water line moves to the second cooling water line along the cooling water connection line, and the cooling water in the second cooling water line moves through the chiller and then moves from the cooling water valve to the first cooling water line, and the refrigerant in the first refrigerant line is discharged from the compressor and passes through the heat exchanger, the indoor unit, the first expansion valve, and the outdoor unit, and passes through the third expansion valve and the chiller along the second refrigerant line while the second expansion valve is closed, and then heat-exchanges with the cooling water in the second cooling water line and then flows into the compressor through the accumulator.

[0020] In the third heating mode, the coolant that has passed through the electrical components in the first coolant line moves to the second coolant line along the coolant connection line, then moves through the chiller from the coolant valve to the first coolant line, and the coolant that has passed through the battery in the second coolant line moves from the coolant valve to the second coolant line along the coolant branch line, and the refrigerant in the first refrigerant line is discharged from the compressor and passes through the heat exchanger, the indoor unit, the first expansion valve, and the outdoor unit, and, with the second expansion valve closed, passes through the third expansion valve and the chiller along the second refrigerant line, and after heat exchange with the coolant in the second coolant line, passes through the accumulator, and is then introduced into the compressor.

[0021] The above refrigerant circulation line further includes a fourth refrigerant line through which the refrigerant passing through the indoor unit branches and moves while bypassing the outdoor unit, and the fourth refrigerant line has one end connected to the first refrigerant line at an inlet-side front end of the outdoor unit, and the other end connected to the first refrigerant line at a rear end of an outlet-side of the outdoor unit, and a first valve is installed in the fourth refrigerant line, and a second valve is installed between the inlet-side front end of the outdoor unit and a branch point of the fourth refrigerant line, and in the heating mode, the refrigerant in the first refrigerant line is discharged from the compressor, passes through the heat exchanger and the indoor unit, and expands while passing through the first expansion valve, and moves while bypassing the outdoor unit along the fourth refrigerant line in a state where the first valve is open and the second valve is closed, and passes through the third expansion valve and the chiller along the second refrigerant line in a state where the second expansion valve is closed, and then flows into the compressor through the accumulator.

[0022] The above refrigerant circulation line further includes a fifth refrigerant line that branches off the refrigerant that has passed through the indoor unit and moves while bypassing the outdoor unit, and the fifth refrigerant line has one end connected to the first refrigerant line between the first expansion valve and the outdoor unit, and the other end connected to the second refrigerant line between the chiller and the third expansion valve, and a first valve is installed in the fifth refrigerant line, and a second valve is installed between the inlet end of the outdoor unit and the branch point of the fifth refrigerant line, and in the heating mode, the refrigerant in the first refrigerant line is discharged from the compressor, passes through the heat exchanger and the indoor unit, expands while passing through the first expansion valve, and moves to the second refrigerant line while bypassing the outdoor unit along the fifth refrigerant line in a state where the first valve is open and the second valve is closed, and passes through the chiller in a state where the third expansion valve is closed, and then flows into the compressor through the accumulator.

[0023] The above refrigerant circulation line further includes a fifth refrigerant line through which the refrigerant passing through the indoor unit branches and moves while bypassing the outdoor unit, and the fifth refrigerant line has one end connected to the first refrigerant line between the indoor unit and the first expansion valve, and the other end connected to the second refrigerant line at the inlet end of the third expansion valve, and a first valve is installed in the fifth refrigerant line, and in the heating mode, the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger and the indoor unit, and moves along the fifth refrigerant line to the second refrigerant line while bypassing the outdoor unit with the first expansion valve closed and the first valve open, and is expanded while passing through the third expansion valve, and then flows into the compressor through the chiller and the accumulator.

[0024] The above refrigerant circulation line further includes a fifth refrigerant line that branches off the refrigerant that has passed through the indoor unit and moves while bypassing the outdoor unit, and the fifth refrigerant line has one end connected to the first refrigerant line between the indoor unit and the first expansion valve, and the other end connected to the second refrigerant line at the inlet end of the third expansion valve, and a fifth expansion valve is installed in the fifth refrigerant line, and in the heating mode, the refrigerant in the first refrigerant line is discharged from the compressor, passes through the heat exchanger and the indoor unit, expands while passing through the fifth expansion valve in a state where the first expansion valve is closed, and then moves to the second refrigerant line while bypassing the outdoor unit along the fifth refrigerant line, passes through the third expansion valve and the chiller, and then flows into the compressor via the accumulator.

[0025] According to an embodiment of the present invention, a vehicle thermal management system capable of improving cooling and heating performance and efficiency can be provided.

[0026] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0027] FIG. 1 is a schematic diagram illustrating a vehicle thermal management system according to an embodiment of the present invention.

[0028] Figure 2 is a drawing showing the operation of a vehicle thermal management system in the first cooling mode.

[0029] Figure 3 is a drawing showing the operation of a vehicle thermal management system in a second cooling mode.

[0030] Figure 4 is a drawing showing the operation in the third cooling mode of the vehicle thermal management system.

[0031] Figure 5 is a drawing showing the operation in the first heating mode of the vehicle thermal management system.

[0032] FIG. 6 is a diagram showing operation in a first heating mode according to another embodiment of a vehicle thermal management system.

[0033] Figure 7 is a drawing showing the operation in the second heating mode of the vehicle thermal management system.

[0034] Figure 8 is a drawing showing the operation in the third heating mode of the vehicle thermal management system.

[0035] FIG. 9 is a schematic diagram illustrating a vehicle thermal management system according to another embodiment of the present invention.

[0036] Fig. 10 is a drawing showing the operation in hot gas mode of the vehicle thermal management system illustrated in Fig. 9.

[0037] FIG. 11 is a schematic diagram illustrating a vehicle thermal management system according to another embodiment of the present invention.

[0038] FIG. 12 is a schematic diagram illustrating a vehicle thermal management system according to another embodiment of the present invention.

[0039] FIG. 13 is a schematic diagram illustrating a vehicle thermal management system according to another embodiment of the present invention.

[0040] Figures 14 and 15 are drawings showing modified examples of the vehicle thermal management system illustrated in Figure 13.

[0041] The present invention is susceptible to various modifications and embodiments, and specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, but should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention. Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a second component may be referred to as a first component, and similarly, a first component may also be referred to as a second component. The term and / or includes a combination of a plurality of related described items or any of a plurality of related described items.

[0042] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0043] In the description of embodiments, when one component is described as being formed "on or under" another component, "on or under" includes both cases where the two components are in direct contact with each other or where one or more other components are formed indirectly between the two components. In addition, when expressed as "on or under," it can include the meaning of not only the upward direction but also the downward direction based on one component.

[0044] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0045] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0046] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or corresponding components are given the same reference numbers, and redundant descriptions thereof will be omitted.

[0047] FIG. 1 schematically illustrates a vehicle thermal management system (1) according to an embodiment of the present invention.

[0048] Referring to the drawings, a vehicle thermal management system (1) according to an embodiment of the present invention may largely include a refrigerant circulation line (100) through which refrigerant moves and a coolant circulation line (200) through which coolant moves.

[0049] The refrigerant circulation line (100) may be configured to circulate the refrigerant discharged from the compressor (110). In an embodiment, the refrigerant circulation line (100) may include a first refrigerant line (101) and a second refrigerant line (102). The refrigerant may circulate while moving along the first refrigerant line (101). In addition, the refrigerant may branch and move into the first refrigerant line (101) and the second refrigerant line (102).

[0050] A compressor (110), a heat exchanger (120), an indoor unit (130), a first expansion valve (191), an outdoor unit (140), a second expansion valve (192), an evaporator (150), and an accumulator (160) may be installed in the first refrigerant line (101). In the first refrigerant line (101), the refrigerant moves sequentially through the compressor (110), the heat exchanger (120), and the indoor unit (130), and the refrigerant that has passed through the indoor unit (130) may sequentially pass through the first expansion valve (191), the outdoor unit (140), the second expansion valve (192), the evaporator (150), and the accumulator (160) before being introduced back into the compressor (110).

[0051] The second refrigerant line (102) is configured so that the refrigerant passing through the outdoor unit (140) bypasses the second expansion valve (192) and the evaporator (150), and a third expansion valve (193) and a chiller (170) can be installed.

[0052] The second refrigerant line (102) may have one end connected to the first refrigerant line (101) between the outdoor unit (140) and the second expansion valve (192), and the other end connected to the first refrigerant line (101) between the evaporator (150) and the accumulator (160). The refrigerant passing through the outdoor unit (140) may branch off from the first refrigerant line (101) and move along the second refrigerant line (102) and pass through the third expansion valve (193) and the chiller (170). Then, it may join the first refrigerant line (101) and flow into the compressor (110) via the accumulator (160).

[0053] The compressor (110) receives power from a power source such as an engine or motor and operates to compress the introduced refrigerant and then discharge it into the first refrigerant line (101) in a high-temperature, high-pressure gaseous state.

[0054] The indoor unit (130) can condense the refrigerant discharged from the compressor (110). The indoor unit (130) is installed inside the air conditioning unit (300) and can exchange heat between the refrigerant and a heat medium inside the air conditioning unit (300). The heat medium that exchanges heat with the refrigerant may be air flowing inside the air conditioning unit (300). The air is heated in the indoor unit (130) and flows into the vehicle to heat the interior of the vehicle.

[0055] A heat exchanger (120) may be placed between the compressor (110) and the indoor unit (130) in the first refrigerant line (101). The heat exchanger (120) may be configured to be connected to the cooling water circulation line (200) so that the refrigerant that has exchanged heat with the cooling water flows into the indoor unit (130). That is, the heat exchanger (120) allows the high-temperature refrigerant discharged from the compressor (110) to exchange heat with the cooling water so that the refrigerant flows into the indoor unit (130) with a reduced temperature. Through this, thermal deformation and heat pick-up phenomenon of the air conditioning device (300) can be minimized.

[0056] In an embodiment, the heat exchanger (120) may be provided as a structure that is integral with the compressor (110). In the present embodiment, the heat exchanger (120) is exemplified as being integral with the compressor (110), but is not limited thereto. For example, the heat exchanger (120) may be provided as a separate structure separated from the compressor (110).

[0057] The outdoor unit (140) can exchange heat between the introduced refrigerant and the heat medium. In an embodiment, the outdoor unit (140) can include an air-cooled condenser, and the heat medium that exchanges heat with the refrigerant can include outside air. The refrigerant that has exchanged heat with the outside air can be condensed.

[0058] The evaporator (150) is installed inside the air conditioner (300) together with the indoor unit (130) and can exchange heat with the introduced refrigerant and a heat medium. The heat medium that exchanges heat with the refrigerant may be air flowing inside the air conditioner (300), and the air that has exchanged heat with the refrigerant is supplied to the inside of the vehicle to cool the inside of the vehicle.

[0059] A temperature control door (310) may be provided between the indoor unit (130) and the evaporator (150) inside the air conditioner (300) to control the amount of air bypassing the indoor unit (130) and the amount of air passing through the indoor unit (130). In addition, an electric heater (not shown) for heating the air may be further installed inside the air conditioner (300).

[0060] The chiller (170) may be configured to exchange heat between a refrigerant moving along the second refrigerant line (102) and a heat medium. Here, the heat medium may include cooling water circulating along the cooling water circulation line (200). That is, the chiller (170) may recover waste heat of the electrical components (220) through heat exchange with the cooling water. In addition, the chiller (170) may cool the battery (260).

[0061] When refrigerant flows in along the first refrigerant line (101), the accumulator (160) can separate the refrigerant into gas and liquid and supply the gaseous refrigerant to the compressor (110).

[0062] In an embodiment, an internal heat exchanger (180) may be further installed in the first refrigerant line (101). The internal heat exchanger (180) may exchange heat between the refrigerant moving through the outdoor unit (140) and the refrigerant moving through the accumulator (160) to the compressor (110).

[0063] The first expansion valve (191), the second expansion valve (192), and the third expansion valve (193) can perform expansion, flow control, and opening / closing functions of the refrigerant. In an embodiment, the first expansion valve (191), the second expansion valve (192), and the third expansion valve (193) can be electronic 2-way expansion valves of a full open type.

[0064] The coolant circulation line (200) may include a first coolant line (201) through which coolant passing through the electrical components (220) is circulated, a second coolant line (202) through which coolant passing through the battery (260) is circulated, a coolant valve (210), a coolant branch line (203), and a coolant connection line (204).

[0065] The first cooling water line (201) is connected to a heat exchanger (120), so that the cooling water of the first cooling water line (201) can exchange heat with the refrigerant discharged from the compressor (110) in the heat exchanger (120). An electric component (220), a first pump (230) for circulating the cooling water, a radiator (240) for cooling the cooling water, and a reservoir tank (250) can be arranged in the first cooling water line (201).

[0066] The second coolant line (202) is connected to the chiller (170), so that the coolant in the second coolant line (202) can exchange heat with the coolant moving along the second coolant line (102) in the chiller (170). A battery (260), a second pump (270) for circulating the coolant, and a heater (280) can be arranged in the second coolant line (202).

[0067] The coolant valve (210) can selectively connect the first coolant line (201) and the second coolant line (202). The coolant valve (210) can operate so that the first coolant line (201) and the second coolant line (202) each implement independent circulation loops, and can prevent the coolant of the first coolant line (201) and the coolant of the second coolant line (202) from mixing with each other. In addition, the coolant valve (210) can operate so that the first coolant line (201) and the second coolant line (202) implement a circulation loop in which they are connected, and the coolant can move along the first coolant line (201) and the second coolant line (202).

[0068] The coolant branch line (203) may be connected to the second coolant line (202) through the coolant valve (210) at one end at the inlet side of the battery (260), and the other end may be connected to the second coolant line (202) at the rear end at the outlet side of the battery (260). The coolant branch line (203) may be connected to the second coolant line (202) to implement a closed loop in which coolant circulates through the battery (260).

[0069] The coolant connection line (204) may have one end connected to the first coolant line (201) at the rear end of the outlet side of the electric component (220), and the other end connected to the second coolant line (202) at the rear end of the outlet side of the battery (260). The coolant connection line (204) may be connected to a coolant valve (210) to implement a circulation loop in which coolant moves between the first coolant line (201) and the second coolant line (202). In an embodiment, the coolant may move from the first coolant line (201) to the second coolant line (202) along the coolant connection line (204), and may move from the second coolant line (202) to the first coolant line (201) through the coolant valve (210) and circulate.

[0070] Below, the operation according to the operating mode of the vehicle thermal management system (1) according to the embodiment of the present invention is described.

[0071] Figure 2 shows the operation in the first cooling mode.

[0072] Referring to FIG. 2, in the first cooling mode, the first cooling water line (201) may be configured to implement an independent cooling water circulation loop so that the cooling water of the first cooling water line (201) moves through the heat exchanger (120), and the second cooling water line (202) may be configured so that the cooling water does not move.

[0073] That is, the coolant valve (210) operates to circulate the coolant along the first coolant line (201), and the coolant that has passed through the electrical components (220) passes through the heat exchanger (120) and exchanges heat with the refrigerant (heat absorption), and passes through the radiator (240) and exchanges heat with the outside air. Then, it moves through the coolant valve (210) and passes through the electrical components (220) again.

[0074] The refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120), and after exchanging heat (radiating heat) with the coolant in the first coolant line (201), moves to the indoor unit (130), and exchanges heat with the air inside the air conditioner (300) while passing through the indoor unit (130). At this time, the temperature control door (310) blocks the air that has exchanged heat with the refrigerant in the indoor unit (130) from being supplied to the interior of the vehicle. The refrigerant passes through the fully opened first expansion valve (191) in a non-expanded state, and then exchanges heat with the outside air in the outdoor unit (140).

[0075] The refrigerant that has passed through the outdoor unit (140) while the third expansion valve (193) is closed expands while passing through the second expansion valve (192), and flows into the evaporator (150) to exchange heat with the air inside the air conditioner (300). Accordingly, the cooled air can be supplied to the vehicle interior to perform cooling. The refrigerant that has passed through the evaporator (150) passes through the accumulator (160) and flows back into the compressor (110).

[0076] In this way, the high-temperature refrigerant discharged from the compressor (110) exchanges heat with the cooling water in the heat exchanger (120) and flows into the indoor unit (130) with the temperature lowered, thereby minimizing thermal deformation and heat pick-up phenomenon of the air conditioning device (300).

[0077] Figure 3 shows the operation in the second cooling mode.

[0078] Referring to FIG. 3, in the second cooling mode, the first cooling water line (201) and the second cooling water line (202) each implement independent cooling water circulation loops, and the cooling water of the first cooling water line (201) can be configured to move by passing through the heat exchanger (120), and the cooling water of the second cooling water line (202) can be configured to move by passing through the chiller (170).

[0079] That is, the coolant valve (210) operates to independently circulate the coolant along the first coolant line (201), and the coolant that has passed through the electrical component (220) passes through the heat exchanger (120) to exchange heat with the refrigerant (heat absorption), and passes through the radiator (240) to exchange heat with the outside air. Then, it moves through the coolant valve (210) to pass through the electrical component (220) again. In addition, the coolant valve (210) operates to independently circulate the coolant along the second coolant line (202), and the coolant that has passed through the battery (260) passes through the chiller (170) to exchange heat with the refrigerant (heat dissipation), and moves through the coolant valve (210) to pass through the battery (260) again.

[0080] The refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120), and after exchanging heat (radiating heat) with the coolant in the first coolant line (201), moves to the indoor unit (130), and exchanges heat with the air inside the air conditioner (300) while passing through the indoor unit (130). At this time, the temperature control door (310) blocks the air that has exchanged heat with the refrigerant in the indoor unit (130) from being supplied to the interior of the vehicle. The refrigerant passes through the fully opened first expansion valve (191) in a non-expanded state, and then exchanges heat with the outside air in the outdoor unit (140).

[0081] The refrigerant passing through the outdoor unit (140) is partially branched into the second refrigerant line (102), expanded while passing through the third expansion valve (193), and then flows into the chiller (170) to exchange heat with the coolant of the second coolant line (202) (heat absorption). Accordingly, the battery (260) can be cooled. The refrigerant passing through the chiller (170) flows into the first refrigerant line (101) through the accumulator (160) and then back into the compressor (110).

[0082] The remainder of the refrigerant that has passed through the outdoor unit (140) is expanded while passing through the second expansion valve (192) along the first refrigerant line (101), and flows into the evaporator (150) to exchange heat with the air inside the air conditioner (300). Accordingly, the cooled air can be supplied to the interior of the vehicle to perform cooling. The refrigerant that has passed through the evaporator (150) is fed back into the compressor (110) through the accumulator (160) together with the refrigerant that has joined in the second refrigerant line (102).

[0083] Figure 4 shows the operation in the third cooling mode.

[0084] Referring to FIG. 4, in the third cooling mode, the first cooling water line (201) and the second cooling water line (202) each implement independent cooling water circulation loops, and the cooling water of the first cooling water line (201) may be configured to move through the heat exchanger (120), and the cooling water of the second cooling water line (202) may be configured to move through the chiller (170). Since the movement of the cooling water in the third cooling mode is the same as in the second cooling mode, a detailed description thereof will be omitted.

[0085] The refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120), and after exchanging heat (radiating heat) with the coolant in the first coolant line (201), moves to the indoor unit (130), and exchanges heat with the air inside the air conditioner (300) while passing through the indoor unit (130). At this time, the temperature control door (310) blocks the air that has exchanged heat with the refrigerant in the indoor unit (130) from being supplied to the interior of the vehicle. The refrigerant passes through the fully opened first expansion valve (191) in a non-expanded state, and then exchanges heat with the outside air in the outdoor unit (140).

[0086] The refrigerant that has passed through the outdoor unit (140) while the second expansion valve (192) is blocked is branched into the second refrigerant line (102), expanded while passing through the third expansion valve (193), and flows into the chiller (170) where it exchanges heat with the coolant of the second coolant line (202) (heat absorption). Accordingly, the battery (260) can be cooled. The refrigerant that has passed through the chiller (170) flows into the first refrigerant line (101) through the accumulator (160) and then back into the compressor (110).

[0087] Figure 5 shows the operation in the first heating mode.

[0088] Referring to Fig. 5, in the first heating mode, the cooling water circulation line (200) can be configured so that the cooling water does not move.

[0089] The refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120) without exchanging heat with the cooling water, and then moves to the indoor unit (130). While passing through the indoor unit (130), it exchanges heat with the air inside the air conditioning device (300). At this time, the temperature control door (310) is opened so that the air that has exchanged heat with the refrigerant in the indoor unit (130) is supplied into the vehicle interior. Accordingly, the air heated by the refrigerant is supplied as warm air into the vehicle interior, so that heating can be performed.

[0090] The refrigerant passing through the indoor unit (130) expands as it passes through the first expansion valve (191) and exchanges heat with the outside air in the outdoor unit (140) (heat absorption). The refrigerant passing through the outdoor unit (140) with the second expansion valve (192) closed passes through the third expansion valve (193) that is fully opened along the second refrigerant line (102) in a non-expanded state and flows into the compressor (110) through the chiller (170) and the accumulator (160).

[0091] In this way, in the first heating mode, the outdoor unit (140) operates by absorbing heat from the outside air.

[0092] Figure 6 illustrates operation in a first heating mode according to another embodiment.

[0093] Referring to Fig. 6, in the first heating mode, the coolant circulation line (200) may be configured to allow coolant to circulate through the battery (260). That is, the second coolant line (202) may be connected to the coolant branch line (203) to implement a closed loop in which the coolant circulates through the battery (260). Specifically, the coolant that has passed through the battery (260) may move along the coolant branch line (203), move from the coolant valve (210) to the second coolant line (202), and then pass through the battery (260) again. At this time, the heater (280) may operate to heat the coolant, thereby increasing the temperature of the battery (260).

[0094] The movement of the refrigerant is the same as the first heating mode disclosed in Fig. 5, so a detailed description is omitted.

[0095] Figure 7 shows the operation in the second heating mode.

[0096] Referring to FIG. 7, in the second heating mode, the cooling water that has passed through the electrical component (220) in the first cooling water line (201) moves to the second cooling water line (202) along the cooling water connection line (204), and the cooling water in the second cooling water line (202) moves through the chiller (170) and then moves to the first cooling water line (201) from the cooling water valve (210).

[0097] The refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120) without exchanging heat with the cooling water, and then moves to the indoor unit (130). While passing through the indoor unit (130), it exchanges heat with the air inside the air conditioning device (300). At this time, the temperature control door (310) is opened so that the air that has exchanged heat with the refrigerant in the indoor unit (130) is supplied into the vehicle interior. Accordingly, the air heated by the refrigerant is supplied as warm air into the vehicle interior, so that heating can be performed.

[0098] The refrigerant passing through the indoor unit (130) expands as it passes through the first expansion valve (191) and passes through the outdoor unit (140) without exchanging heat with the outside air. For example, the active air flap and fan (not shown) arranged in front of the outdoor unit (140) may be not driven to prevent the outside air from exchanging heat with the refrigerant in the outdoor unit (140).

[0099] The refrigerant that has passed through the outdoor unit (140) while the second expansion valve (192) is closed passes through the third expansion valve (193) that is fully opened along the second refrigerant line (102) in a non-expanded state, and flows into the chiller (170) where it exchanges heat with the cooling water of the second cooling water line (202) (heat absorption). The refrigerant that has passed through the chiller (170) flows into the first refrigerant line (101) through the accumulator (160) and then back into the compressor (110).

[0100] In this way, in the second heating mode, the chiller (170) operates by recovering waste heat from the electric components (220).

[0101] Meanwhile, depending on the embodiment, it is also possible to configure the refrigerant to pass through the first expansion valve (191) in a non-expanded state with the refrigerant fully opened, and to expand while passing through the third expansion valve (193). In this case, the active air flap and fan may be driven to additionally allow the outdoor unit (140) to absorb outside air heat.

[0102] Figure 8 shows the operation in the third heating mode.

[0103] Referring to FIG. 8, in the third heating mode, the coolant that has passed through the electrical component (220) in the first coolant line (201) may be configured to move to the second coolant line (202) along the coolant connection line (204), and the coolant in the second coolant line (202) may be configured to move through the chiller (170) and then move to the first coolant line (201) from the coolant valve (210) (see FIG. 7). In addition, the coolant that has passed through the battery (260) in the second coolant line (202) may be configured to move to the second coolant line (202) from the coolant valve (210) along the coolant branch line (203).

[0104] The refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120) without exchanging heat with the cooling water, and then moves to the indoor unit (130). While passing through the indoor unit (130), it exchanges heat with the air inside the air conditioning device (300). At this time, the temperature control door (310) is opened so that the air that has exchanged heat with the refrigerant in the indoor unit (130) is supplied into the vehicle interior. Accordingly, the air heated by the refrigerant is supplied as warm air into the vehicle interior, so that heating can be performed.

[0105] The refrigerant passing through the indoor unit (130) passes through the fully opened first expansion valve (191) in a non-expanded state and passes through the outdoor unit (140) without exchanging heat with the outside air. For example, the active air flap and fan (not shown) arranged in front of the outdoor unit (140) may be not driven to prevent the outside air from exchanging heat with the refrigerant in the outdoor unit (140). This allows the frost formed on the outdoor unit (140) to be melted (defrosted).

[0106] The refrigerant that has passed through the outdoor unit (140) while the second expansion valve (192) is blocked expands while passing through the third expansion valve (193) along the second refrigerant line (102), and flows into the chiller (170) where it exchanges heat with the cooling water of the second cooling water line (202) (heat absorption). The refrigerant that has passed through the chiller (170) flows into the first refrigerant line (101) through the accumulator (160) and then back into the compressor (110).

[0107] In this way, in the third heating mode, the chiller (170) operates by recovering waste heat from the electric components (220). In addition, the battery (260) can be heated and the outdoor unit (140) can be defrosted.

[0108] Fig. 9 schematically illustrates a vehicle thermal management system (2) according to another embodiment of the present invention. Fig. 9 illustrates a refrigerant circulation line (100) and its configuration with the coolant circulation line (200) omitted from Fig. 1.

[0109] Unlike the thermal management system (1) according to the embodiment of Fig. 1, the thermal management system (2) according to the present embodiment is different in that the refrigerant circulation line (100) further includes a third refrigerant line (103). The following description focuses on the differences.

[0110] The third refrigerant line (103) is configured so that a portion of the refrigerant flowing into the indoor unit (130) is branched off and moves bypassing the indoor unit (130), the outdoor unit (140), and the evaporator (150), and a fourth expansion valve (194) may be installed.

[0111] The third refrigerant line (103) may have one end connected to the first refrigerant line (101) at the inlet end of the indoor unit (130), and the other end connected to the first refrigerant line (101) at the inlet end of the accumulator (160). Some of the refrigerant flowing into the indoor unit (130) may branch off from the first refrigerant line (101), move along the third refrigerant line (103), and pass through the fourth expansion valve (194). Then, it may join the first refrigerant line (101) and flow into the compressor (110) via the accumulator (160).

[0112] In an embodiment, the fourth expansion valve (194) may be a full open type electronic 2-way expansion valve.

[0113] Figure 10 shows the operation of the thermal management system (2) in hot gas mode.

[0114] Referring to Fig. 10, in the hot gas mode, the coolant circulation line (200) may be configured so that the coolant does not move as in the first heating mode. Alternatively, as in the second heating mode, the coolant that has passed through the electrical components (220) in the first coolant line (201) may move to the second coolant line (202) along the coolant connection line (204), and the coolant in the second coolant line (202) may move through the chiller (170) and then move to the first coolant line (201) through the coolant valve (210). Of course, as in the third heating mode, the second coolant line (202) may additionally implement a closed loop in which the coolant circulates through the battery (260) in connection with the coolant branch line (203).

[0115] The refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120) without exchanging heat with the cooling water, and then moves to the indoor unit (130), and some of it branches off and moves along the third refrigerant line (103).

[0116] The refrigerant passes through the indoor unit (130) and exchanges heat with the air inside the air conditioner (300), thereby enabling heating to be performed. Then, it expands as it passes through the first expansion valve (191), and then flows into the compressor (110) via the outdoor unit (140), the fully opened third expansion valve (193), the chiller (170), and the accumulator (160). This movement of the refrigerant is the same as in the first heating mode or the second heating mode, so a detailed description thereof will be omitted.

[0117] The refrigerant branched into the third refrigerant line (103) expands while passing through the fourth expansion valve (194), and then flows back into the compressor (110) via the accumulator (160). By configuring a portion of the high-temperature refrigerant discharged from the compressor (110) to expand and then flow back into the compressor (110), the temperature and pressure of the refrigerant before compression can be increased overall. When the refrigerant with the increased temperature and pressure flows into the compressor (110), the temperature and pressure on the discharge side increase in the Ph diagram during compression in the compressor (110), thereby improving the heating capacity and efficiency of the thermal management system (2). This hot gas mode is configured to improve heating performance by using the compressor (110), and heating can be performed in the hot gas mode without turning on the PTC heater at maximum heating under conditions where the outside temperature is low. That is, when the outside temperature is low and the initial heating load is large, the hot gas mode is entered, and when heating becomes possible in the general heating mode, the hot gas mode is released.

[0118] Fig. 11 schematically illustrates a vehicle thermal management system (3) according to another embodiment of the present invention.

[0119] Unlike the thermal management system (1) according to the embodiment of Fig. 1, the thermal management system (3) according to the present embodiment is different in that the refrigerant circulation line (100) further includes a fourth refrigerant line (104). The following description focuses on the differences.

[0120] The fourth refrigerant line (104) is configured so that the refrigerant passing through the indoor unit (130) branches off and moves bypassing the outdoor unit (140), and a first valve (195) may be installed.

[0121] The fourth refrigerant line (103) can be connected to the first refrigerant line (101) at one end at the inlet side of the outdoor unit (140), and the other end can be connected to the first refrigerant line (101) at the rear end at the outlet side of the outdoor unit (140).

[0122] A second valve (196) may be installed between the inlet end of the outdoor unit (140) and the branch point of the fourth refrigerant line (104). In addition, a check valve (197) may be installed between the outlet end of the outdoor unit (140) and the branch point of the fourth refrigerant line (104).

[0123] In an embodiment, the first valve (195) and the second valve (196) may be automatic shut-off valves (ASVs) without expansion function. The check valve (197) may prevent the refrigerant that bypasses the outdoor unit (140) along the fourth refrigerant line (104) from flowing back to the outdoor unit (140).

[0124] The fourth refrigerant line (104) can function as a bypass line to prevent frost formation during the process of the refrigerant passing through the outdoor unit (140). That is, by allowing the refrigerant to bypass the outdoor unit (140), frost formation in the outdoor unit (140) due to the refrigerant can be prevented.

[0125] In addition, in an electric vehicle, when the active air flap of the vehicle is closed above a certain speed or under certain conditions for aerodynamic performance, the air flowing into the outdoor unit (140) is blocked, so the refrigerant can be configured to bypass the outdoor unit (140) to reduce resistance.

[0126] In heating mode, the refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120) without exchanging heat with the cooling water, and then moves to the indoor unit (130), and exchanges heat with the air inside the air conditioner (300) while passing through the indoor unit (130). Through this, heating can be performed.

[0127] The refrigerant expands as it passes through the first expansion valve (191), then moves along the fourth refrigerant line (104) while the first valve (195) is open and the second valve (196) is closed, bypassing the outdoor unit (140), passes through the internal heat exchanger (180), passes through the third expansion valve (193) and the chiller (170), which are fully opened, along the second refrigerant line (102) while the second expansion valve (192) is closed, and then flows back along the first refrigerant line (101) through the accumulator (160) and the internal heat exchanger (180) to the compressor (110). At this time, the refrigerant can exchange heat with the cooling water of the second cooling water line (202) in the chiller (170) (heat absorption). Since this movement of the refrigerant is the same as the second heating mode or the third heating mode, a detailed description thereof will be omitted.

[0128] Fig. 12 schematically illustrates a vehicle thermal management system (4) according to another embodiment of the present invention.

[0129] Unlike the thermal management system (1) according to the embodiment of Fig. 1, the thermal management system (4) according to the present embodiment is different in that the refrigerant circulation line (100) further includes a fifth refrigerant line (105). The following will focus on the differences.

[0130] The fifth refrigerant line (105) is configured so that the refrigerant passing through the indoor unit (130) branches off and moves bypassing the outdoor unit (140) and the internal heat exchanger (180), and a first valve (195) may be installed.

[0131] The fifth refrigerant line (105) may be connected to the first refrigerant line (101) between the first expansion valve (191) and the outdoor unit (140) at one end, and may be connected to the second refrigerant line (102) between the chiller (170) and the third expansion valve (193) at the other end. In addition, a second valve (196) may be installed between the inlet end of the outdoor unit (140) and the branch point of the fifth refrigerant line (105).

[0132] The first valve (195) and the second valve (196) may be automatic shut-off valves (ASVs) without expansion function.

[0133] The fifth refrigerant line (105) can function as a bypass line to prevent frost formation during the process of the refrigerant passing through the outdoor unit (140). That is, by allowing the refrigerant to bypass the outdoor unit (140) and the internal heat exchanger (180), frost formation in the outdoor unit (140) due to the refrigerant can be prevented.

[0134] In heating mode, the refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120) without exchanging heat with the cooling water, and then moves to the indoor unit (130), and exchanges heat with the air inside the air conditioner (300) while passing through the indoor unit (130). Through this, heating can be performed.

[0135] The refrigerant expands as it passes through the first expansion valve (191), then moves to the second refrigerant line (102) along the fifth refrigerant line (105) while the first valve (195) is open and the second valve (196) is closed, bypasses the outdoor unit (140) and the internal heat exchanger (180), and then passes through the chiller (170) while the third expansion valve (193) is closed, and then flows back along the first refrigerant line (101) through the accumulator (160) and the internal heat exchanger (180) to the compressor (110). At this time, the refrigerant can exchange heat with the cooling water of the second cooling water line (202) in the chiller (170) (heat absorption). Additionally, since only the refrigerant that has passed through the accumulator (160) passes through the internal heat exchanger (180), heat exchange between the refrigerants does not occur in the internal heat exchanger (180).

[0136] Fig. 13 schematically illustrates a vehicle thermal management system (5) according to another embodiment of the present invention.

[0137] The thermal management system (5) according to the present embodiment differs from the thermal management system (4) according to the embodiment illustrated in Fig. 12 in that the connection structure of the fifth refrigerant line (105) is different. The following will focus on the differences.

[0138] The fifth refrigerant line (105) is configured so that the refrigerant passing through the indoor unit (130) branches off and moves bypassing the outdoor unit (140) and the internal heat exchanger (180), and a first valve (195) may be installed. The first valve (195) may be an automatic shut-off valve (ASV) without an expansion function.

[0139] The fifth refrigerant line (105) may have one end connected to the first refrigerant line (101) between the indoor unit (130) and the first expansion valve (191), and the other end connected to the second refrigerant line (102) at the inlet end of the third expansion valve (193). In addition, a check valve (197) may be arranged between the branch point of the second refrigerant line (102) with the first refrigerant line (101) and the branch point of the second refrigerant line (102) with the fifth refrigerant line (105). This check valve (197) can prevent the refrigerant that has moved to the second refrigerant line (102) along the fifth refrigerant line (105) from flowing back toward the outdoor unit (140) and accumulating.

[0140] In heating mode, the refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120) without exchanging heat with the cooling water, and then moves to the indoor unit (130), and exchanges heat with the air inside the air conditioner (300) while passing through the indoor unit (130). Through this, heating can be performed.

[0141] The refrigerant moves to the second refrigerant line (102) along the fifth refrigerant line (105) while the first expansion valve (191) is closed and the first valve (195) is open, bypasses the outdoor unit (140) and the internal heat exchanger (180), passes through the third expansion valve (193) in the second refrigerant line (102), expands, passes through the chiller (170), and flows into the compressor (110) through the accumulator (160) and the internal heat exchanger (180) along the first refrigerant line (101). At this time, the refrigerant can exchange heat with the cooling water of the second cooling water line (202) in the chiller (170) (heat absorption). In addition, since only the refrigerant that has passed through the accumulator (160) passes through the internal heat exchanger (180), heat exchange between the refrigerants does not occur in the internal heat exchanger (180).

[0142] FIG. 14 and FIG. 15 illustrate a modified example of the vehicle thermal management system (5') according to the embodiment illustrated in FIG. 13.

[0143] Referring to the drawing, the fifth refrigerant line (105) is configured so that the refrigerant passing through the indoor unit (130) branches off and moves bypassing the outdoor unit (140) and the internal heat exchanger (180), and a fifth expansion valve (198) may be installed. The fifth expansion valve (198) may be a fully open type electronic 2-way expansion valve.

[0144] In heating mode, the refrigerant in the first refrigerant line (101) is discharged from the compressor (110), passes through the heat exchanger (120) without exchanging heat with the cooling water, and then moves to the indoor unit (130), and exchanges heat with the air inside the air conditioner (300) while passing through the indoor unit (130). Through this, heating can be performed.

[0145] The refrigerant expands as it passes through the fifth expansion valve (198) while the first expansion valve (191) is closed, and then moves to the second refrigerant line (102) along the fifth refrigerant line (105), bypassing the outdoor unit (140) and the internal heat exchanger (180), and then passes through the third expansion valve and the chiller (170) that are fully opened in the second refrigerant line (102), and then flows into the compressor (110) through the accumulator (160) and the internal heat exchanger (180) along the first refrigerant line (101). At this time, the refrigerant can exchange heat with the cooling water of the second cooling water line (202) in the chiller (170) (heat absorption). In addition, since only the refrigerant that has passed through the accumulator (160) passes through the internal heat exchanger (180), heat exchange between the refrigerants does not occur in the internal heat exchanger (180).

[0146] Meanwhile, as shown in Fig. 15, a check valve (197) may be optionally further arranged between the branch point of the second refrigerant line (102) with the first refrigerant line (101) and the branch point of the second refrigerant line (102) with the fifth refrigerant line (105). This check valve (197) can prevent the refrigerant from flowing back toward the outdoor unit (140) and accumulating.

[0147] While the present invention has been described above with reference to specific embodiments, those skilled in the art will appreciate that various modifications and variations can be made to the present invention without departing from the spirit and scope of the invention as defined in the claims below. Furthermore, any differences resulting from such modifications and variations should be construed as being within the scope of the present invention as defined in the appended claims.

Claims

1. A vehicle thermal management system comprising a refrigerant circulation line through which refrigerant sequentially passes through a compressor and an indoor unit, and a coolant circulation line through which coolant moves, wherein a heat exchanger connected to the coolant circulation line is arranged between the compressor and the indoor unit in the refrigerant circulation line, such that the refrigerant that has exchanged heat with the coolant is introduced into the indoor unit.

2. In paragraph 1, A vehicle thermal management system characterized in that the heat exchanger is provided as an integral structure with the compressor.

3. In paragraph 1, The above refrigerant circulation line is, A first refrigerant line in which a first expansion valve, an outdoor unit, a second expansion valve, an evaporator, and an accumulator are installed, through which the refrigerant passing through the indoor unit passes sequentially; and A second refrigerant line that allows the refrigerant passing through the outdoor unit to move bypassing the second expansion valve and the evaporator; A vehicle thermal management system comprising:

4. In paragraph 3, A vehicle thermal management system characterized in that a third expansion valve and a chiller are installed in the second refrigerant line.

5. In paragraph 3, A vehicle thermal management system, characterized in that one end of the second refrigerant line is connected to the first refrigerant line between the outdoor unit and the second expansion valve, and the other end is connected to the first refrigerant line between the evaporator and the accumulator.

6. In paragraph 3, First, a third refrigerant line is connected to the first refrigerant line at the inlet end of the indoor unit, and the other end is connected to the first refrigerant line at the inlet end of the accumulator. A vehicle thermal management system characterized in that a fourth expansion valve is installed in the third refrigerant line.

7. In paragraph 3, A vehicle thermal management system further comprising an internal heat exchanger installed in the first refrigerant line to exchange heat between the refrigerant moving through the outdoor unit and the refrigerant moving through the accumulator to the compressor.

8. In paragraph 3, A vehicle thermal management system characterized in that the indoor unit and the evaporator are installed inside an air conditioning unit, and a temperature control door is provided between the indoor unit and the evaporator.

9. In paragraph 4, The above cooling water circulation line is, The first coolant line, through which coolant passing through the entire body is circulated and where the radiator is placed; A second coolant line in which coolant passing through the battery is circulated and a heater is placed; A cooling water valve that selectively connects the first cooling water line and the second cooling water line; A coolant branch line, which is connected to the second coolant line through the coolant valve at the inlet end of the battery and is connected to the second coolant line at the outlet end of the battery; and A coolant connection line, which is connected to the first coolant line at the rear end of the outlet side of the above-mentioned electric component, and is connected to the second coolant line at the rear end of the outlet side of the battery; A thermal management system for a vehicle comprising:

10. In paragraph 9, A vehicle thermal management system, characterized in that the first coolant line is connected to the heat exchanger, and the second coolant line is connected to the chiller.

11. In paragraph 10, In the first cooling mode, The first cooling water line implements an independent cooling water circulation loop so that the cooling water of the first cooling water line moves through the heat exchanger, and the second cooling water line is configured so that the cooling water does not move. A vehicle thermal management system characterized in that the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger, exchanges heat with the coolant of the first coolant line, and then moves to the indoor unit, and passes through the first expansion valve, the outdoor unit, the second expansion valve, the evaporator, and the accumulator while the third expansion valve is closed, and then flows into the compressor.

12. In paragraph 10, In the second cooling mode, The first cooling water line and the second cooling water line each implement an independent cooling water circulation loop, and the cooling water of the first cooling water line is configured to move through the heat exchanger, and the cooling water of the second cooling water line is configured to move through the chiller. A vehicle thermal management system characterized in that the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger, and moves to the indoor unit after heat exchange with the cooling water of the first cooling water line, a portion of the refrigerant that has passed through the first expansion valve and the outdoor unit passes through the third expansion valve and the chiller along the second refrigerant line, and after heat exchange with the cooling water of the second cooling water line, passes through the accumulator and flows into the compressor, and the remainder of the refrigerant passes through the second expansion valve, the evaporator, and the accumulator along the first refrigerant line and then flows into the compressor.

13. In paragraph 10, In the first heating mode, The above cooling water circulation line is configured so that the cooling water does not move. A vehicle thermal management system characterized in that the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger, the indoor unit, the first expansion valve, and the outdoor unit, and passes through the third expansion valve and the chiller along the second refrigerant line while the second expansion valve is closed, and then flows into the compressor through the accumulator.

14. In paragraph 10, In the second heating mode, The cooling water that has passed through the electrical component in the first cooling water line moves to the second cooling water line along the cooling water connection line, and the cooling water in the second cooling water line moves through the chiller and then moves to the first cooling water line from the cooling water valve. A vehicle thermal management system characterized in that the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger, the indoor unit, the first expansion valve, and the outdoor unit, and passes through the third expansion valve and the chiller along the second refrigerant line while the second expansion valve is closed, and then heat-exchanges with the coolant of the second coolant line and then flows into the compressor through the accumulator.

15. In paragraph 10, In the third heating mode, The coolant that has passed through the electrical component in the first coolant line moves to the second coolant line along the coolant connection line, then moves through the chiller to the first coolant line from the coolant valve, and the coolant that has passed through the battery in the second coolant line moves to the second coolant line from the coolant valve along the coolant branch line. A vehicle thermal management system characterized in that the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger, the indoor unit, the first expansion valve, and the outdoor unit, and passes through the third expansion valve and the chiller along the second refrigerant line while the second expansion valve is closed, and then heat-exchanges with the coolant of the second coolant line and then flows into the compressor through the accumulator.

16. In paragraph 4, The above refrigerant circulation line further includes a fourth refrigerant line that branches off the refrigerant that has passed through the indoor unit and moves bypassing the outdoor unit. The fourth refrigerant line is connected to the first refrigerant line at the inlet end of the outdoor unit at one end, and the other end is connected to the first refrigerant line at the outlet end of the outdoor unit at the other end. A first valve is installed in the fourth refrigerant line, and a second valve is installed between the inlet end of the outdoor unit and the branch point of the fourth refrigerant line. A vehicle thermal management system characterized in that, in heating mode, the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger and the indoor unit, and expands while passing through the first expansion valve, and moves along the fourth refrigerant line while bypassing the outdoor unit in a state where the first valve is open and the second valve is closed, and passes through the third expansion valve and the chiller along the second refrigerant line in a state where the second expansion valve is closed, and then flows into the compressor through the accumulator.

17. In paragraph 4, The above refrigerant circulation line further includes a fifth refrigerant line that branches off the refrigerant that has passed through the indoor unit and moves bypassing the outdoor unit. The fifth refrigerant line has one end connected to the first refrigerant line between the first expansion valve and the outdoor unit, and the other end connected to the second refrigerant line between the chiller and the third expansion valve. A first valve is installed in the fifth refrigerant line, and a second valve is installed between the inlet end of the outdoor unit and the branch point of the fifth refrigerant line. A vehicle thermal management system characterized in that, in heating mode, the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger and the indoor unit, expands while passing through the first expansion valve, moves to the second refrigerant line by bypassing the outdoor unit along the fifth refrigerant line while the first valve is open and the second valve is closed, and passes through the chiller while the third expansion valve is closed, and then flows into the compressor through the accumulator.

18. In paragraph 4, The above refrigerant circulation line further includes a fifth refrigerant line that branches off the refrigerant that has passed through the indoor unit and moves bypassing the outdoor unit. The fifth refrigerant line has one end connected to the first refrigerant line between the indoor unit and the first expansion valve, and the other end connected to the second refrigerant line at the inlet end of the third expansion valve. A first valve is installed in the above fifth refrigerant line, A vehicle thermal management system characterized in that, in heating mode, the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger and the indoor unit, moves to the second refrigerant line by bypassing the outdoor unit along the fifth refrigerant line while the first expansion valve is closed and the first valve is open, and then passes through the third expansion valve, expands, and flows into the compressor through the chiller and the accumulator.

19. In paragraph 4, The above refrigerant circulation line further includes a fifth refrigerant line that branches off the refrigerant that has passed through the indoor unit and moves bypassing the outdoor unit. The fifth refrigerant line has one end connected to the first refrigerant line between the indoor unit and the first expansion valve, and the other end connected to the second refrigerant line at the inlet end of the third expansion valve. A fifth expansion valve is installed in the fifth refrigerant line. A vehicle thermal management system characterized in that, in heating mode, the refrigerant of the first refrigerant line is discharged from the compressor, passes through the heat exchanger and the indoor unit, passes through the fifth expansion valve while the first expansion valve is closed, expands, and then moves to the second refrigerant line, bypasses the outdoor unit along the fifth refrigerant line, passes through the third expansion valve and the chiller, and then flows into the compressor via the accumulator.

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