Vehicle Heat Pump System

Abstract

To provide a vehicular heat pump system which enables improvement of heating efficiency.SOLUTION: A vehicular heat pump system includes: a cooling device which includes a radiator and a reservoir tank and circulates a coolant in a coolant line; a battery cooling device which includes a battery coolant line connected to the coolant line by a first valve and a second water pump connected to the battery coolant line and circulates the coolant in a battery module; a heating device which includes a heating line selectively connected to the coolant line for heating a passenger compartment with the coolant by a second valve, a third water pump provided in the heating line, and a heater; and a chiller which is provided in the battery coolant line between the first valve and the battery module, is connected to a chiller connection line by the second valve and connected to a refrigerant line of an air conditioner by a refrigerant connection line, and conducts heat exchange between the coolant circulating in the battery coolant line and a refrigerant selectively supplied from the air conditioner to adjust a temperature of the coolant.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a heat pump system for a vehicle, and more particularly to a heat pump system for a vehicle that adjusts the temperature of a battery module using a single chiller in which a refrigerant and a coolant exchange heat, and improves heating efficiency by utilizing waste heat generated by electrical equipment. [Background technology]

[0002] In general, an air conditioning system for a vehicle includes an air conditioner that circulates a refrigerant to heat or cool the interior of the vehicle. Such an air conditioner is configured to maintain a comfortable interior environment by maintaining the interior temperature of the vehicle at an appropriate temperature regardless of changes in the outside temperature, and is configured to heat or cool the interior of the vehicle by heat exchange in the evaporator as the refrigerant discharged by the compressor passes through a condenser, a receiver-drier, an expansion valve, and an evaporator and circulates back to the compressor. That is, in the cooling mode in summer, the air conditioner lowers the temperature and humidity in the interior by evaporating the high-temperature, high-pressure gas-phase refrigerant compressed by the compressor through the condenser after passing through the receiver-drier and the expansion valve in the evaporator.

[0003] Meanwhile, as interest in energy efficiency and environmental pollution issues has been growing, there has been a demand for the development of environmentally friendly automobiles that can essentially replace internal combustion engine automobiles, and such environmentally friendly automobiles are generally classified into electric automobiles that are driven by fuel cells or electricity as a power source, and hybrid automobiles that are driven by an engine and a battery. Among such environmentally friendly vehicles, electric automobiles and hybrid automobiles do not use a separate heater, unlike the air conditioning system of a general vehicle, and generally use a heat pump system.

[0004] In addition, in the case of electric vehicles, the driving force is generated by converting the chemical reaction energy between oxygen and hydrogen into electrical energy, and in this process, thermal energy is generated by the chemical reaction in the fuel cell, so effective removal of the generated heat is essential to ensure the performance of the fuel cell. In addition, in hybrid vehicles, the driving force is generated by driving a motor using electricity supplied from a fuel cell or an electric battery, in addition to an engine that runs on normal fuel, so unless the heat generated from the fuel cell, battery, and motor is effectively removed, it is difficult to ensure the performance of the motor.

[0005] Therefore, in the conventional hybrid vehicles and electric vehicles, in order to prevent the battery including the motor, the electric equipment, and the fuel cell from generating heat, the battery cooling system, together with the cooling means and the heat pump system, must be configured as sealed circuits. Therefore, there are disadvantages in that the size and weight of the cooling module disposed at the front of the vehicle increases, and the layout of the connecting pipes for supplying the refrigerant or coolant to each of the heat pump system, the cooling means, and the battery cooling system inside the engine room becomes complicated. In addition, in order to optimize the performance of the battery, a separate battery cooling system is provided for heating or cooling the battery depending on the vehicle condition, and multiple valves are used to connect with each connecting pipe, and noise and vibration due to frequent opening and closing of the valves are transmitted to the vehicle interior, resulting in a poor ride comfort. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-77880 A Summary of the Invention [Problem to be solved by the invention]

[0007] The object of the present invention is to provide a heat pump system for a vehicle that can improve heating efficiency by regulating the temperature of a battery module using a single chiller in which a refrigerant and a coolant exchange heat, and by recovering waste heat generated by electrical equipment and using it for heating the interior of the vehicle. [Means for solving the problem]

[0008] The vehicle heat pump system according to the present invention includes a cooling device including a radiator connected to a coolant line, a first water pump, a first valve, a second valve, and a reservoir tank, and circulating coolant through the coolant line to cool at least one electrical component provided in the coolant line, a battery cooling device including a battery coolant line connected to the coolant line through the first valve, a second water pump connected to the battery coolant line, and a battery module, and circulating coolant through the battery module, a heating line selectively connected to the coolant line through a second valve to heat a vehicle interior using the coolant, and a heating device including a third water pump and a heater provided in the battery coolant line; and a chiller provided in the battery coolant line between the first valve and the battery module, connected to a chiller connection line through the second valve and connected to a refrigerant line of an air conditioning device through a refrigerant connection line, and adjusting a temperature of the coolant by exchanging heat between the coolant circulating through the battery coolant line and the refrigerant selectively supplied from the air conditioning device, and the reservoir tank is provided in the coolant line between the radiator and the first valve, and connected to the coolant line connecting the first valve and the first water pump through a supply line.

[0009] The heater is characterized in that it is provided inside an HVAC module included in the air conditioner.

[0010] The battery cooling device further includes a coolant heater provided in the battery coolant line between the battery module and the chiller.

[0011] When the battery module is heated, the battery coolant line is disconnected from the coolant line by operation of the first valve, the second water pump is operated to circulate the coolant along the battery coolant line, and the coolant heater is operated to heat the coolant supplied to the battery module along the battery coolant line.

[0012] The air conditioner includes an evaporator connected through the refrigerant line, an HVAC module having an opening / closing door therein for adjusting the flow of outside air that has passed through the evaporator into the heater selectively according to a cooling, heating, or dehumidification mode of the vehicle, a condenser provided in the heating line between the second valve and the heater, through which coolant circulates and which exchanges heat between the refrigerant supplied through the refrigerant line and the coolant, a compressor connected through the refrigerant line between the evaporator and the condenser, a first expansion valve provided in the refrigerant line between the condenser and the evaporator, and a second expansion valve provided in the refrigerant connection line.

[0013] The air conditioner may further include a sub-condenser provided in the refrigerant line between the condenser and the evaporator, and an accumulator provided in the refrigerant line between the evaporator and the compressor and connected to the refrigerant connection line.

[0014] One end of the refrigerant connection line is connected to the refrigerant line between the sub-condenser and the first expansion valve, and the other end of the refrigerant connection line is connected to the accumulator between the evaporator and the compressor.

[0015] The chiller and the condenser are water-cooled heat exchangers, and the sub-condenser is an air-cooled heat exchanger.

[0016] The HVAC module further includes an air heater disposed between the heater and the evaporator to selectively heat outside air flowing into the heater.

[0017] The air heater is operable to increase the temperature of outside air flowing into the heater when the temperature of the coolant supplied to the heater is lower than a target temperature for room heating.

[0018] When the battery module is cooled using a refrigerant, in the cooling device, the first water pump is operated to circulate the coolant in the coolant line, the supply line is opened, the chiller connecting line is closed by operation of the second valve, and operation of the heating device is stopped; in the battery cooling device, the second water pump is operated to circulate the coolant in the battery coolant line, and the cooling device and the battery cooling device form independent closed circuits through which the coolant is circulated by operation of the first valve; and in the air conditioning device, the first expansion valve is operated to close the refrigerant line connected to the evaporator, and the second expansion valve is operated to open the refrigerant connecting line, and the second expansion valve expands the refrigerant supplied to the refrigerant connecting line and supplies it to the chiller.

[0019] When the battery module is cooled in a cooling mode of the vehicle, in the cooling device, the first water pump is operated to circulate the coolant in the coolant line, the supply line is opened, and the chiller connecting line is closed by the operation of the second valve; in the heating device, the second valve is operated to connect the coolant line and the heating line, and the third water pump is operated to circulate the coolant in the heating line; in the battery cooling device, the second water pump is operated to circulate the coolant in the battery coolant line; the first valve is operated to operate the battery cooling device, and the cooling device and the battery cooling device form independent closed circuits through which the coolant is circulated, respectively; and in the air conditioning device, the first expansion valve is operated to open the refrigerant line connected to the evaporator, and the second expansion valve is operated to open the refrigerant connecting line, and the second expansion valve expands the refrigerant supplied to the refrigerant connecting line and supplies it to the chiller.

[0020] When the vehicle is in heating and dehumidification modes, the cooling device and the battery cooling device stop operating, the second valve is operated to close the coolant line and the chiller connecting line, the heating device circulates coolant along the heating line by operating the third water pump, and the air conditioning device closes the refrigerant connecting line by operating the second expansion valve, and the compressor is operated to circulate refrigerant along the refrigerant line.

[0021] When the waste heat of the electrical equipment and the condenser is recovered in a heating mode of the vehicle, in the cooling device, the cooling water line connected to the radiator and the cooling water line connecting the radiator and the reservoir tank are closed and the supply line is opened, the remaining battery cooling water lines except for the battery cooling water line connected to the chiller are closed by the operation of the first valve, the chiller connecting line is opened by the operation of the second valve, and the cooling water whose temperature has increased while passing through the electrical equipment by the operation of the first water pump is supplied to the chiller along the opened cooling water line and the opened chiller connecting line without passing through the radiator, and the third water pump is opened. The cooling water circulates along the heating line by operation of the reservoir pump, and a portion of the cooling water stored in the reservoir tank circulates along the opened cooling water line through the opened supply line, and the cooling device and the heating device form independent closed circuits through which the cooling water circulates by operation of the second valve. In the air conditioner, the refrigerant line connected to the evaporator is closed by operation of the first expansion valve, and the refrigerant connecting line is opened by operation of the second expansion valve, and refrigerant circulates along the refrigerant line by operation of the compressor, and the second expansion valve expands the refrigerant supplied to the refrigerant connecting line and supplies it to the chiller.

[0022] When the electrical equipment and the battery module are cooled using the cooling water cooled by the radiator, the chiller connection line is closed by operation of the second valve, the battery cooling water line is connected to the cooling water line by operation of the first valve, the cooling water cooled by the radiator and stored in the reservoir tank is supplied to the battery module while circulating through the battery cooling water line by operation of the first valve and the second water pump, the cooling water circulated through the battery cooling device is supplied to the electrical equipment while circulating through the cooling water line by operation of the first water pump, and a portion of the cooling water stored in the reservoir tank circulates along the cooling water line through the open supply line.

[0023] When the waste heat of the electrical equipment is utilized in a heating mode of the vehicle, in the cooling device, the coolant line connected to the radiator and the coolant line connecting the radiator and the reservoir tank are closed, and the supply line is opened, and the remaining battery coolant lines except the battery coolant line connected to the chiller are closed by the operation of the first valve, and the chiller connection line is opened by the operation of the second valve. In the heating device, the coolant line and the heating line are connected by the operation of the second valve, and the first water port is opened. The cooling water, the temperature of which increases while passing through the electrical equipment due to the operation of the third water pump, does not pass through the radiator but flows into the heating line connected to the opened cooling water line, the cooling water flowing into the heating line is supplied to the heater by the operation of the third water pump, the cooling water discharged from the heater passes through the chiller along the opened chiller connection line and flows into the electrical equipment again, and a portion of the cooling water stored in the reservoir tank circulates along the opened cooling water line through the opened supply line.

[0024] The second valve opens the coolant line connected to the radiator when the electrical equipment is overheated, allowing a portion of the coolant that has passed through the electrical equipment to flow into the heating line and allowing the remaining coolant to flow into the radiator.

[0025] The first valve is a 4-way valve, and the second valve is a 5-way valve capable of distributing a flow rate.

[0026] The electrical equipment includes a motor, a power control device, an inverter, or an On Board Charger (OBC).

[0027] The supply line is connected to the coolant line when the coolant circulates through the coolant line due to operation of the first water pump. Effect of the Invention

[0028] As described above, according to the heat pump system for a vehicle according to the embodiment of the present invention, the temperature of the battery module is adjusted according to the mode of the vehicle using one chiller in which the coolant and the refrigerant are heat exchanged, and the vehicle interior is heated using the coolant, thereby simplifying and simplifying the entire system. In addition, the present invention can improve heating efficiency by recovering waste heat generated from electrical components and waste heat from the condenser and using it for interior heating. In addition, the present invention can achieve optimal performance of the battery module by efficiently adjusting the temperature of the battery module, and can increase the overall mileage of the vehicle through efficient management of the battery module. In addition, the present invention can reduce manufacturing costs and weight by simplifying the entire system, and can improve space utilization. [Brief description of the drawings]

[0029] [Figure 1] 1 is a block diagram of a vehicle heat pump system according to an embodiment of the present invention; [Diagram 2] 4 is a diagram showing an operating state of the vehicle heat pump system according to the embodiment of the present invention when cooling electrical equipment and a battery module using a radiator. FIG. [Diagram 3] 4 is a diagram showing an operation state of the vehicle heat pump system according to the embodiment of the present invention for cooling a battery module using a refrigerant. FIG. [Figure 4] 4 is a diagram illustrating an operation state of the vehicle heat pump system according to the embodiment of the present invention in a cooling mode of the vehicle. [Diagram 5] 4 is a diagram showing an operation state of the vehicle heat pump system according to the embodiment of the present invention for performing a heating mode by utilizing waste heat from electrical components. FIG. [Figure 6] 4 is a diagram showing an operation state of waste heat recovery of electrical components and a condenser in a heating mode in the heat pump system for a vehicle according to the embodiment of the present invention; FIG. [Figure 7]4 is a diagram showing an operation state of the vehicle heat pump system according to the embodiment of the present invention in a heating mode and a dehumidification mode of the vehicle; [Figure 8] 4 is a diagram illustrating an operation state of the heat pump system for a vehicle according to the embodiment of the present invention with respect to a temperature rise of a battery module. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0031] The embodiment described in this specification and the configuration shown in the drawings are the most preferred embodiments. However, the present invention is not limited to these, and various modifications are possible. Parts unnecessary for the description are omitted, and the same or similar components are given the same reference numerals throughout the specification. The size and thickness of each component shown in the drawings are shown for the convenience of description. Also, the drawings are enlarged to clearly express various parts and areas. The term "comprises" a component does not mean that it excludes other components, but that it can further include other components. Terms such as "... unit", "... means", "... part", and "... member" are used as a comprehensive structural unit that performs one function or operation.

[0032] 1 is a block diagram of a heat pump system for a vehicle according to an embodiment of the present invention. The heat pump system for a vehicle according to an embodiment of the present invention adjusts the temperature of a battery module 24 by using one chiller 30 in which a refrigerant and a coolant exchange heat, and recovers waste heat generated from an electrical component 15 and uses it for heating the interior of the vehicle. Such a heat pump system is applied to an electric vehicle.

[0033] 1, the heat pump system includes a cooling device 10, a battery cooling device 20, a chiller 30, and a heating device 40. The cooling device 10 includes a radiator 12 connected to a coolant line 11, a first water pump 14, a first valve V1, a second valve V2, and a reservoir tank 16. The radiator 12 is disposed at the front of the vehicle, and a cooling fan 13 is provided at the rear thereof, and cools the coolant by operation of the cooling fan 13 and heat exchange with the outside air. The electrical equipment 15 may include an electric power control unit (EPCU), a motor, an inverter, or a charger (OBC).

[0034] The electrical equipment 15 configured as above is provided in the cooling water line 11 and is cooled by a water-cooling system. As a result, when recovering waste heat from the electrical equipment 15 in the vehicle's heating mode, heat generated from the power control device, the motor, the inverter, or the charger can be recovered. In addition, a reservoir tank 16 is provided in the cooling water line 11 between the radiator 12 and the first water pump 14. The reservoir tank 16 stores the cooling water cooled by the radiator 12. Such a cooling device 10 can circulate the cooling water in the cooling water line 11 by operating the first water pump 14 so that the cooling water is supplied to the electrical equipment 15 provided in the cooling water line 11.

[0035] Meanwhile, the reservoir tank 16 is connected to the coolant line 11, which connects the first valve V1 and the first water pump 14, through a supply line 17. The supply line 17 is connected to the coolant line 11 when the coolant circulates in the coolant line 11 due to the operation of the first water pump 14. That is, when the first water pump 14 operates, the reservoir tank 16 can constantly flow a portion of the stored coolant into the coolant line 11 through the supply line 17. This makes it possible to prevent cavitation from occurring in the first water pump 14 when the first water pump 14 operates. In addition, damage to the first water pump 14 due to cavitation can be prevented in advance.

[0036] In this embodiment, the battery cooling device 20 includes a battery coolant line 21 connected to the coolant line 11 through a first valve V1, a second water pump 22 connected to the battery coolant line 21, and a battery module 24. The battery cooling device 20 can selectively circulate the coolant to the battery module 24 by operating the second water pump 22. Meanwhile, the battery cooling device 20 can further include a coolant heater 26 provided in the battery coolant line 21 between the battery module 24 and the first valve V1. When a temperature rise of the battery module 24 is required, the coolant heater 26 is turned on to heat the coolant circulating in the battery coolant line 21, thereby allowing the coolant with the increased temperature to flow into the battery module 24. The coolant heater 26 is an electric heater that is operated by a power supply.

[0037] That is, the coolant heater 26 operates when the temperature of the coolant supplied to the battery module 24 is lower than the target temperature, and can heat the coolant circulating in the battery coolant line 21. As a result, the coolant whose temperature has increased while passing through the coolant heater 26 is supplied to the battery module 24, thereby increasing the temperature of the battery module 24. Therefore, the coolant heater 26 selectively operates when the temperature of the battery module 24 needs to be increased.

[0038] In this embodiment, the chiller 30 is provided in the battery coolant line 21 between the first valve V1 and the battery module 24. The chiller 30 is connected to a chiller connection line 31 selectively connected to the coolant line 11 through a second valve V2. The chiller 30 is also connected to a refrigerant line 51 of the air conditioner 50 through a refrigerant connection line 61. That is, the chiller 30 is a water-cooled heat exchanger into which the coolant flows. Thus, the chiller 30 can adjust the temperature of the coolant by exchanging heat between the coolant selectively supplied to the battery coolant line 21 and the chiller connection line 31 and the refrigerant selectively supplied from the air conditioner 50.

[0039] The heating device 40 may include a heating line 41 selectively connected to the cooling water line 11 through a second valve V2 to heat the vehicle interior using the cooling water, a third water pump 42 provided in the heating line 41, and a heater 52a. When the heating device 40 configured as described above heats the vehicle interior, the heating device 40 may connect the cooling water line 11 connected to the electrical equipment 15 and the heating line 41 by operating the second valve V2 so that high-temperature cooling water that has passed through the electrical equipment 15 is supplied to the heating line 41. As a result, the high-temperature cooling water is supplied to the heater 52a along the heating line 41. In other words, the heating device 40 may heat the vehicle interior by supplying high-temperature cooling water that has flowed from the cooling device 10 into the heating line 41 or cooling water that has been circulated through the heating line 41 to the heater 52a by operating the third water pump 42 in the vehicle heating mode.

[0040] Here, the first, second and third water pumps 14, 22, 42 are electric water pumps. Also, the heater 52a is provided inside an HVAC module 52 included in the air conditioner 50. Here, the HVAC module 52 may further include an air heater 52c provided between the heater 52a and the evaporator 56 to selectively heat the outside air flowing into the heater 52a.

[0041] The air heater 52c operates to raise the temperature of the outside air flowing into the heater 52a when the temperature of the coolant supplied to the heater 52a is lower than the target temperature for interior heating. The air heater 52c is disposed in front of the heater 52a toward the interior of the vehicle inside the HVAC module 52 so as to selectively heat the outside air supplied to the heater 52a.

[0042] In this embodiment, the air conditioner 50 includes an HVAC module (Heating, Ventilation, and Air Conditioning) 52 connected through a refrigerant line 51, a condenser 53, a sub-condenser 54, a first expansion valve 55, an evaporator 56, an accumulator 57, and a compressor 59. First, the HVAC module 52 includes an evaporator 56 connected through a refrigerant line 51, and an opening / closing door 52b for selectively controlling the outside air passing through the evaporator 56 to flow into the heater 52a according to the vehicle's cooling, heating, and heating / dehumidification modes. That is, the opening / closing door 52b is opened in the vehicle's heating mode so that the outside air passing through the evaporator 56 flows into the heater 52a. Conversely, in the vehicle's cooling mode, the opening / closing door 52b closes the heater 52a side so that the outside air cooled while passing through the evaporator 56 immediately flows into the vehicle.

[0043] Here, the HVAC module 52 may further include an air heater 52c provided between the heater 52a and the evaporator 56 to selectively heat the outside air supplied to the heater 52a. The air heater 52c operates to increase the temperature of the outside air flowing into the heater 52a when the temperature of the coolant supplied to the heater 52a is lower than the target temperature for room heating.

[0044] In this embodiment, the condenser 53 is connected to the refrigerant line 51 so that the refrigerant passes through the condenser 53. The condenser 53 is provided in the heating line 41 between the second valve V2 and the heater 52a so that the cooling water circulating in the heating device 40 passes through the condenser 53. The condenser 53 can condense the refrigerant by exchanging heat with the cooling water circulating in the heating line 41. In other words, the condenser 53 is a water-cooled heat exchanger into which the cooling water flows.

[0045] In this embodiment, the sub-condenser 54 is provided in the refrigerant line 51 between the condenser 53 and the evaporator 56. Here, the sub-condenser 54 can further condense the refrigerant condensed in the condenser 53 by heat exchange with the outside air. That is, the sub-condenser 54 is disposed in front of the radiator 12 and exchanges heat between the refrigerant flowing inside and the outside air. That is, the sub-condenser 54 is an air-cooled heat exchanger that condenses the refrigerant by using the outside air.

[0046] In this way, the sub-condenser 54 can further condense the refrigerant condensed in the condenser 53, thereby increasing the subcooling of the refrigerant, thereby improving the coefficient of performance (COP) of the cooling capacity relative to the required power of the compressor. The first expansion valve 55 is provided in the refrigerant line 51 between the sub-condenser 54 and the evaporator 56. The first expansion valve 55 is supplied with the refrigerant that has passed through the sub-condenser 54 and expands it.

[0047] In this embodiment, one end of the refrigerant connection line 61 is connected to the refrigerant line 51 between the sub condenser 54 and the first expansion valve 55. The other end of the refrigerant connection line 61 is connected to the accumulator 57 between the evaporator 56 and the compressor 59. Here, the refrigerant connection line 61 is provided with a second expansion valve 63. When the battery module 24 is cooled with the coolant having exchanged heat with the refrigerant, the second expansion valve 63 can expand the refrigerant flowing through the refrigerant connection line 61 and cause the refrigerant to flow into the chiller 30. That is, the second expansion valve 63 operates to expand the refrigerant when the battery module 24 is cooled using the coolant having exchanged heat with the refrigerant.

[0048] The second expansion valve 63 expands the refrigerant discharged from the sub-condenser 54 and causes the refrigerant to flow into the chiller 30 in a state in which the temperature of the refrigerant has been reduced, thereby further reducing the temperature of the cooling water passing through the inside of the chiller 30. As a result, the cooling water whose temperature has been reduced while passing through the chiller 30 flows into the battery module 24, and is cooled more efficiently. The compressor 59 is connected between the evaporator 56 and the condenser 53 through the refrigerant line 51. The compressor 59 compresses the refrigerant in a gaseous state and supplies the compressed refrigerant to the condenser 53.

[0049] The accumulator 57 is provided in the refrigerant line 51 between the evaporator 56 and the compressor 59. The accumulator 57 improves the efficiency and durability of the compressor 59 by supplying only gaseous refrigerant to the compressor 59. Here, the first and second expansion valves 55 and 61 are electronic expansion valves that selectively expand the refrigerant while controlling the flow of the refrigerant passing through the refrigerant line 51 or the refrigerant connection line 61. In addition, the first valve V1 is a 4-way valve, and the second valve V2 is a 5-way valve capable of flow distribution.

[0050] Hereinafter, the operation and function of the vehicle heat pump system according to the embodiment of the present invention configured as above will be described in detail with reference to FIGS.

[0051] First, the operation of the vehicle heat pump system according to the embodiment of the present invention when cooling the electrical equipment 15 and the battery module 24 using the radiator 12 will be described with reference to FIG.

[0052] FIG. 2 is an operational state diagram of the vehicle heat pump system according to the embodiment of the present invention when cooling electrical equipment and a battery module using a radiator. Referring to FIG. 2, the chiller connection line 31 is closed by the operation of the second valve V2. Also, the battery cooling water line 21 is connected to the cooling water line 11 by the operation of the first valve V1. In this state, the first water pump 14 is operated in the cooling device 10 to cool the electrical equipment 15. In the battery cooling device 20, the second water pump 22 is operated to cool the battery module 24. Then, the cooling water cooled by the radiator 12 and stored in the reservoir tank 16 is circulated to the battery cooling water line 21 by the operation of the first valve V1 and the second water pump 22, and is supplied to the battery module 24. The cooling water circulated in the battery cooling device 20 is supplied to the electrical equipment 15 while circulating in the cooling water line 11 by the operation of the first water pump 14.

[0053] Here, a portion of the cooling water stored in the reservoir tank 16 circulates along the cooling water line 11 through the open supply line 17 . In other words, the cooling water cooled by the radiator 12 and stored in the reservoir tank 16 is circulated through the cooling water line 11 and the battery cooling water line 21 by the operation of the first and second water pumps 14, 22, respectively, thereby cooling the electrical equipment 15 and the battery module 24, respectively, thereby efficiently cooling the electrical equipment 15 and the battery module 24.

[0054] The air conditioner 50 is not operated because the cooling mode of the vehicle is not operated. Meanwhile, in this embodiment, the electrical components 15 and the battery module 24 are all cooled by the coolant, but the present invention is not limited to this, and the first and second water pumps 14, 22 can be selectively operated when either the electrical components 15 or the battery module 24 is to be cooled separately.

[0055] In this embodiment, the operation of cooling the battery module 24 using a refrigerant will be described with reference to FIG.

[0056] 3 is an operational state diagram for cooling a battery module using a refrigerant in a heat pump system for a vehicle according to an embodiment of the present invention. Referring to FIG. 3, the chiller connecting line 31 is closed by the operation of the second valve V2. In this state, in the cooling device 10, the first water pump 14 is operated to cool the electrical components 15. As a result, in the cooling device 10, the cooling water is circulated in the cooling water line 11 by the operation of the first water pump 14. At the same time, the supply line 17 is opened.

[0057] In the battery cooling device 20, the second water pump 22 is operated to cool the battery module 24. Then, in the battery cooling device 20, the operation of the second water pump 22 causes the coolant to circulate in the battery coolant line 21. Here, the cooling device 10 and the battery cooling device 20 can form independent closed circuits in which the coolant circulates, respectively, by the operation of the first valve V1. That is, in the battery cooling device 20, the connection with the coolant line 11 is closed by the operation of the first valve V1. In this state, the battery cooling device 20 can form a closed circuit in which the coolant circulates independently in the battery coolant line 21 by the operation of the second water pump 22.

[0058] Meanwhile, the heating device 40 is stopped. In the air conditioning device 50, each component except the evaporator 56 is operated so that the refrigerant is supplied to the chiller 30. That is, in the air conditioning device 50, the refrigerant line 51 connected to the evaporator 56 is closed by the operation of the first expansion valve 55. In this state, the refrigerant connection line 61 is opened by the operation of the second expansion valve 63. Then, the refrigerant that has passed through the sub-condenser 54 can circulate along the refrigerant line 51 and the refrigerant connection line 61. Here, the second expansion valve 63 can expand the refrigerant supplied to the refrigerant connection line 61 and supply it to the chiller 30. As a result, the coolant that has passed through the chiller 30 circulates through the battery coolant line 21 to cool the battery module 24 by the operation of the second water pump 22.

[0059] The cooling water passing through the chiller 30 is cooled by heat exchange with the expanded refrigerant supplied to the chiller 30. The cooling water cooled in the chiller 30 is supplied to the battery module 24. As a result, the battery module 24 is cooled by the cooled cooling water. That is, the second expansion valve 63 expands the refrigerant that has passed through the sub-condenser 54 so as to supply the expanded refrigerant to the chiller 30, and opens the refrigerant connection line 61. Therefore, the refrigerant discharged from the sub-condenser 54 expands due to the operation of the second expansion valve 63 to a low temperature and low pressure state, and flows into the chiller 30 connected to the refrigerant connection line 61.

[0060] Thereafter, the refrigerant that has flowed into the chiller 30 exchanges heat with the cooling water, passes through the accumulator 57 via the refrigerant connection line 61, and then flows into the compressor 59. The compressor 59 compresses the refrigerant and supplies it to the condenser 53. The sub-condenser 54 can condense the refrigerant that has flowed in from the condenser 53 by heat exchange with the outside air. Therefore, the cooling water whose temperature has increased while cooling the battery module 24 is cooled by heat exchange with the low-temperature, low-pressure refrigerant inside the chiller 30. The cooled cooling water is supplied again to the battery module 24 through the battery cooling water line 21. That is, the cooling water can efficiently cool the battery module 24 by repeating this process.

[0061] On the other hand, when the refrigerant is used to cool the battery module 24 and it is necessary to cool the vehicle interior, the refrigerant line 51 connecting the sub condenser 54 and the evaporator 56 is opened by the operation of the first expansion valve 55. In other words, the first expansion valve 55 can selectively open or close the refrigerant line 51 connecting the sub condenser 54 and the evaporator 56 depending on whether or not the vehicle interior is being cooled.

[0062] In this embodiment, the operation of the vehicle in the cooling mode will be described with reference to FIG.

[0063] FIG. 4 is an operating state diagram of the vehicle heat pump system according to the embodiment of the present invention in a vehicle cooling mode. Referring to FIG. 4, in the cooling device 10, the first water pump 14 is operated to circulate the coolant in the coolant line 11. At the same time, the supply line 17 is opened. Here, the chiller connection line 31 is closed by the operation of the second valve V2. In the heating device 40, the second valve V2 is operated to connect the coolant line 11 and the heating line 41. In this state, the third water pump 42 is operated to circulate the coolant supplied from the cooling device 11 in the heating line 41. As a result, the coolant cooled in the radiator 12 passes through the electrical equipment 15, and is then supplied to the condenser 53 by the operation of the first and third water pumps 14 and 42.

[0064] Meanwhile, in the battery cooling device 20, the second water pump 22 is operated to cool the battery module 24. Then, in the battery cooling device 20, the operation of the second water pump 22 causes the coolant to circulate through the battery coolant line 21. Here, the cooling device 10 and the battery cooling device 20 can form independent closed circuits through which the coolant circulates, respectively, by the operation of the first valve V1. That is, in the battery cooling device 20, the connection with the coolant line 11 is closed by the operation of the first valve V1.

[0065] In this state, the battery cooling device 20 can form a closed circuit in which the coolant circulates independently in the battery coolant line 21 by the operation of the second water pump 22. That is, the coolant line 11 and the battery coolant line 21 each form an independent closed circuit by the operation of the first valve V1. As a result, in the battery cooling device 20, the coolant that has passed through the chiller 30 is supplied to the battery module 24 along the battery coolant line 21 by the operation of the second water pump 22.

[0066] In the air conditioner 50, each component operates to cool the vehicle interior. As a result, the refrigerant circulates along the refrigerant line 51. Here, the refrigerant line 51 connecting the sub-condenser 54 and the evaporator 56 is opened by the operation of the first expansion valve 55. The refrigerant connection line 61 is opened by the operation of the second expansion valve 63. Then, the refrigerant that has passed through the sub-condenser 54 can circulate along the refrigerant line 51 and the refrigerant connection line 61. Here, the first and second expansion valves 55 and 63 can expand the refrigerant so that the expanded refrigerant is supplied to the evaporator 56 and the chiller 30, respectively. Meanwhile, the heating device 40 supplies the cooling water supplied by the cooling device 10 to the condenser 53 by the operation of the third water pump 42. As a result, the condenser 53 condenses the refrigerant by using the cooling water flowing along the heating line 41. Then, the sub-condenser 54 can further condense the refrigerant that has flowed in from the condenser 53 by heat exchange with the outside air.

[0067] Meanwhile, the cooling water that has passed through the chiller 30 circulates through the battery cooling water line 21 to cool the battery module 24 by operation of the second water pump 22. The cooling water passing through the chiller 30 is cooled by heat exchange with the expanded refrigerant supplied to the chiller 30. The cooling water cooled by the chiller 30 is supplied to the battery module 24. As a result, the battery module 24 is cooled by the cooled cooling water. In other words, the second expansion valve 63 expands a portion of the refrigerant that has passed through the sub condenser 54 so as to supply the expanded refrigerant to the chiller 30, and opens the refrigerant connection line 61.

[0068] Therefore, a part of the refrigerant discharged from the sub-condenser 54 expands due to the operation of the second expansion valve 63 to a low temperature and low pressure state, and flows into the chiller 30 connected to the refrigerant connection line 61. Thereafter, the refrigerant that flows into the chiller 30 exchanges heat with the cooling water, passes through the accumulator 57 via the refrigerant connection line 61, and then flows into the compressor 59. As a result, the cooling water, whose temperature has increased while cooling the battery module 24, is cooled by heat exchange with the low temperature and low pressure refrigerant inside the chiller 30. The cooled cooling water is supplied again to the battery module 24 along the battery cooling water line 21. That is, the cooling water circulated in the battery cooling device 20 can efficiently cool the battery module 24 by repeating this process.

[0069] Meanwhile, the remaining refrigerant discharged from the sub-condenser 54 flows through the refrigerant line 51 to cool the interior of the vehicle, and passes through the first expansion valve 55, the evaporator 56, the compressor 59, and the condenser 53 in sequence. Here, the outside air flowing into the HVAC module 52 is cooled as it passes through the evaporator 56 by the low-temperature refrigerant that has flowed into the evaporator 56. At this time, the opening and closing door 52b closes the portion that passes through the heater 52a so that the cooled outside air does not pass through the heater 52a. Therefore, the cooled outside air can directly flow into the interior of the vehicle to cool the interior of the vehicle.

[0070] Meanwhile, the refrigerant, the amount of which is increased while passing through the condenser 53 and the sub-condenser 54 in sequence, expands and is supplied to the evaporator 56, so that the refrigerant can be evaporated at a lower temperature. That is, in this embodiment, the condenser 53 condenses the refrigerant, and the sub-condenser 54 further condenses the refrigerant, which is advantageous for forming a subcooled refrigerant. The subcooled refrigerant evaporates at a lower temperature in the evaporator 56, so that the temperature of the outside air passing through the evaporator 56 can be further lowered, and the cooling performance and efficiency can be improved. By repeating this process, the refrigerant cools the interior of the vehicle in the cooling mode, and at the same time, the refrigerant can cool the coolant by heat exchange while passing through the chiller 30. The low-temperature coolant cooled in the chiller 30 flows into the battery module 24. As a result, the battery module 24 can be efficiently cooled by the supplied low-temperature coolant.

[0071] In this embodiment, the operation of the vehicle in a heating mode in which waste heat from the electrical equipment 15 is utilized without operating the air conditioner 50 will be described with reference to FIG.

[0072] FIG. 5 is an operation state diagram for performing a heating mode using waste heat from electrical equipment in a heat pump system for a vehicle according to an embodiment of the present invention. Referring to FIG. 5, the heat pump system can heat the vehicle interior using waste heat from electrical equipment 15. First, the first water pump 14 in the cooling device 10 operates to circulate the coolant. At this time, the operation of the air conditioner device 50 is stopped. Here, the coolant line 11 connected to the radiator 12 and the coolant line 11 connecting the radiator 12 and the reservoir tank 16 are closed. The supply line 17 is opened.

[0073] That is, a portion of the coolant stored in the reservoir tank 16 can circulate along the open coolant line 11 through the open supply line 17. Here, the remaining battery coolant lines 21 except for the battery coolant line 21 connected to the chiller 30 are closed by operation of the first valve V1. That is, the battery coolant line 21 connecting the second water pump 22 and the battery module 24 is closed, and the operation of the battery cooling device 20 is interrupted. And, in the heating device 40, the coolant line 11 and the heating line 41 are connected by operation of the second valve V2.

[0074] Here, the chiller connecting line 31 is opened by the operation of the second valve V2. In this state, the cooling water whose temperature has increased while passing through the electrical equipment 15 by the operation of the first water pump 14 does not pass through the radiator 12, but flows into the heating line 41 connected to the opened cooling water line 11. The cooling water that has flowed into the heating line 41 is supplied to the heater 52a by the operation of the third water pump 42. The cooling water discharged from the heater 52a passes through the chiller 30 along the opened chiller connecting line 31, and then flows again into the electrical equipment 15 along the opened cooling water line 11.

[0075] That is, the coolant that has passed through the electrical equipment 15 does not pass through the radiator 12, but continues to circulate along the open coolant line 11, absorbing waste heat from the electrical equipment 15 and increasing in temperature. The coolant whose temperature has increased is supplied to the heater 52a through the heating line 41 connected to the coolant line 11, without passing through the radiator 12. Here, the coolant that has flowed into the heating line 41 passes through the heater 52a due to the operation of the third water pump 42. At this time, the air heater 52c is selectively operated according to the temperature of the outside air that has passed through the heater 52a.

[0076] The air heater 52c is operated when the temperature of the outside air passing through the heater 52a is lower than the target temperature, and can heat the outside air flowing into the vehicle cabin. That is, the air heater 52c is operated when the temperature of the outside air passing through the heater 52a is lower than the target temperature, and can heat the outside air flowing into the vehicle cabin. The air heater 52c is operated when the temperature of the outside air that has completed heat exchange with the high-temperature coolant while passing through the heater 52a is lower than the set temperature or the heating target temperature. That is, when the air heater 52c is operated, the outside air is heated while passing through the air heater 52c, and flows into the vehicle cabin in a state where the temperature has increased.

[0077] Meanwhile, the high-temperature coolant supplied to the heater 52a exchanges heat with the outside air, and then flows through the chiller connection line 31 connected to the heating line 41 through the second valve V2, the chiller 30, and a part of the battery coolant line 21, and then flows into the coolant line 11, without passing through the radiator 12. Here, the opening and closing door 52b is opened so that the outside air flowing into the HVAC module 52 passes through the heater 52a. As a result, the outside air flowing in from the outside flows in at room temperature, not cooled, when passing through the evaporator 56 to which no refrigerant is supplied. The outside air flowing in is converted to a high-temperature state while passing through the heater 52a, and flows into the vehicle interior, thereby implementing the heating of the vehicle interior. That is, the present invention repeats the above process, recovers waste heat generated from the electrical equipment 15, and uses it for interior heating, thereby reducing power consumption and improving overall heating efficiency.

[0078] Meanwhile, in the process of recovering waste heat from the electrical equipment 15 using the coolant to heat the interior of the vehicle, if the electrical equipment 15 becomes overheated, the second valve V2 is operated to open the coolant line 11 connected to the radiator 12 and the coolant line 11 connecting the radiator 12 and the reservoir tank 16. As a result, the remaining coolant that is not supplied to the heater 52a is cooled while passing through the radiator 12. The cooled coolant passes through the electrical equipment 15 together with the coolant that has passed through the chiller 30 along the heating line 41 and the chiller connecting line 31, recovering waste heat and efficiently cooling the electrical equipment 15. In other words, when the electrical equipment 15 becomes overheated, the second valve V2 opens the coolant line 11 connected to the radiator 12 to allow some of the coolant that has passed through the electrical equipment 15 to flow into the heating line 41 and the remaining coolant to flow into the radiator 12. As a result, a portion of the cooling water cooled by the radiator 12 is supplied to the electrical equipment 15, thereby preventing the electrical equipment 15 from overheating.

[0079] Therefore, the present invention can reduce power consumption and improve overall heating efficiency by recovering waste heat generated by the electrical equipment 15 and using it for heating the interior of the vehicle. At the same time, the present invention can efficiently cool the electrical equipment 15 and ensure the cooling performance of the electrical equipment 15 by controlling the operation of the second valve V2 capable of flow distribution to allow a portion of the coolant to flow into the radiator 12 and be cooled before being supplied to the electrical equipment 15.

[0080] The operation of this embodiment when recovering waste heat from the outside air heat source, the electrical equipment 15 and the condenser 53 in the vehicle heating mode will be described with reference to FIG.

[0081] Fig. 6 is an operational state diagram for waste heat recovery of electrical components and a condenser according to a heating mode in a heat pump system for a vehicle according to an embodiment of the present invention. Referring to Fig. 6, the first water pump 14 in the cooling device 10 operates to circulate the coolant. Here, the coolant line 11 connected to the radiator 12 and the coolant line 11 connecting the radiator 12 and the reservoir tank 16 are closed. The supply line 17 is opened. That is, a portion of the coolant stored in the reservoir tank 16 can circulate along the open coolant line 11 through the open supply line 17.

[0082] Here, the remaining battery cooling water lines 21 except for the battery cooling water line 21 connected to the chiller 30 are closed by the operation of the first valve V1. That is, the battery cooling water line 21 connecting the second water pump 22 and the battery module 24 is closed, and the operation of the battery cooling device 20 is interrupted.

[0083] On the other hand, the chiller connection line 31 is opened by the operation of the second valve V2. In this state, the cooling water whose temperature has increased while passing through the electrical equipment 15 due to the operation of the first water pump 14 does not pass through the radiator 12, but is supplied to the chiller 30 along the opened cooling water line 11 and the opened chiller connection line 31. Then, the cooling water that has passed through the electrical equipment 15 does not pass through the radiator 12, but continues to circulate along the cooling water line 11, the chiller connection line 31, and the open part of the battery cooling water line 21, and absorbs waste heat from the electrical equipment 15 to increase its temperature. The cooling water whose temperature has increased is supplied to the chiller 30 along the chiller connection line 31. In other words, the cooling water whose temperature has increased by absorbing the waste heat from the electrical equipment 15 passes through the chiller 30 due to the operation of the first water pump 14, and is collected while increasing the temperature of the refrigerant supplied to the chiller 30. In the heating device 40, the cooling water is circulated along the heating line 41 by the operation of the third water pump 42.

[0084] As a result, the cooling water circulating through the heating line 41 passes through the condenser 53 by the operation of the third water pump 42, and is then supplied to the heater 52a. In other words, the cooling device 10 and the heating device 40 can form independent closed circuits in which the cooling water circulates, respectively, by the operation of the second valve V2. As a result, the cooling water circulating through the heating line 41 passes through the heater 52a by the operation of the third water pump 42, and is then supplied to the condenser 53. Meanwhile, in the air conditioning device 50, each component except for the evaporator 56 operates so that the refrigerant is supplied to the chiller 30.

[0085] Here, the refrigerant line 51 connected to the evaporator 56 is closed by the operation of the first expansion valve 55. In this state, the refrigerant connection line 61 is opened by the operation of the second expansion valve 63. Then, the refrigerant that has passed through the sub-condenser 54 can circulate along the refrigerant line 51 and the refrigerant connection line 61. Here, the second expansion valve 63 can expand the refrigerant supplied to the refrigerant connection line 61 and supply it to the chiller 30. Then, the cooling water whose temperature has increased by absorbing the waste heat of the electrical components 15 passes through the chiller 30 by the operation of the first water pump 14, and is recovered while increasing the temperature of the refrigerant supplied to the chiller 30.

[0086] That is, the chiller 30 is supplied with refrigerant from the sub-condenser 54 and expanded by operation of the second expansion valve 63, and is supplied through the refrigerant connecting line 61. The chiller 30 then evaporates the supplied refrigerant through heat exchange with cooling water whose temperature has increased as it passes through the electrical equipment 15, thereby recovering waste heat from the electrical equipment 15. The refrigerant that has passed through the chiller 30 is then supplied to the accumulator 57 along the refrigerant connecting line 61.

[0087] The refrigerant supplied to the accumulator 57 is separated into gas and liquid. The gas refrigerant in the refrigerant separated into gas and liquid is supplied to the compressor 59. The refrigerant compressed in a high-temperature and high-pressure state from the compressor 59 flows into the condenser 53. Here, the refrigerant supplied to the condenser 53 can increase the temperature of the cooling water while exchanging heat with the cooling water circulating through the heating line 41. The cooling water with the increased temperature is supplied to the heater 52a. That is, the heating device 40 supplies the cooling water circulating through the heating line 41 to the condenser 53 by operating the third water pump 42. As a result, the condenser 53 condenses the refrigerant supplied from the compressor 59 by using the cooling water circulating along the heating line 41.

[0088] At this time, the temperature of the cooling water circulating through the heating line 41 increases as it passes through the condenser 53 and exchanges heat with the refrigerant. The cooling water with the increased temperature is supplied to the heater 52a along the heating line 41. Here, the air heater 52c is selectively operated according to the temperature of the outside air that has passed through the heater 52a. Therefore, the air heater 52c is operated when the temperature of the outside air that has passed through the heater 52a is lower than a target temperature, thereby heating the outside air that flows into the vehicle cabin. In other words, the air heater 52c is operated when the temperature of the outside air that has passed through the heater 52a is lower than a target temperature, thereby heating the outside air that flows into the vehicle cabin.

[0089] The air heater 52c operates when the temperature of the outside air that has completed heat exchange with the high-temperature coolant while passing through the heater 52a is lower than the set temperature or the heating target temperature. When the air heater 52c operates, the outside air flows into the vehicle cabin in a state in which the temperature is increased by being heated while passing through the air heater 52c. Here, the opening and closing door 52b is opened so that the outside air that has flowed into the HVAC module 52 and passed through the evaporator 56 passes through the heater 52a. As a result, the outside air that flows in from the outside flows in at room temperature without being cooled when passing through the evaporator 56 to which no refrigerant is supplied. The outside air that flows in is converted to a high-temperature state while passing through the heater 52a and flows into the vehicle cabin, thereby heating the vehicle cabin.

[0090] That is, the heat pump system according to the present embodiment uses the waste heat of the electrical components 15 and the waste heat of the condenser 53 to increase the temperature of the refrigerant in the heating mode of the vehicle, thereby reducing the power consumption of the compressor 59 and improving the heating efficiency. The operation of the vehicle in the heating and dehumidification modes of the present embodiment will be described with reference to FIG.

[0091] 7 is an operation state diagram for vehicle heating and dehumidification modes in the vehicle heat pump system according to the embodiment of the present invention. Referring to FIG. 7, the cooling device 10 and the battery cooling device 20 are stopped. Here, the coolant line 11 and the chiller connection line 31 are closed by the operation of the second valve V2. In the heating device 40, the coolant circulates along the heating line 41 by the operation of the third water pump 42.

[0092] Then, the cooling water circulating through the heating line 41 passes through the condenser 53 by the operation of the third water pump 42, and is then supplied to the heater 52a. As a result, the condenser 53 condenses the refrigerant supplied from the compressor 59 using the cooling water circulating along the heating line 41. At this time, the temperature of the cooling water circulating through the heating line 41 increases as it passes through the condenser 53 and exchanges heat with the refrigerant. The cooling water with the increased temperature is supplied to the heater 52a along the heating line 41. Here, the air heater 52c is selectively operated according to the temperature of the outside air that has passed through the heater 52a.

[0093] The air heater 52c is operable when the temperature of the outside air passing through the heater 52a is lower than the target temperature to heat the outside air flowing into the vehicle cabin. That is, the air heater 52c is operable when the temperature of the outside air passing through the heater 52a is lower than the target temperature to heat the outside air flowing into the vehicle cabin. The air heater 52c is operable when the temperature of the outside air that has completed heat exchange with the high-temperature coolant while passing through the heater 52a is lower than the set temperature or the heating target temperature. When the air heater 52c is operated, the outside air is heated while passing through the air heater 52c and flows into the vehicle cabin in a state where the temperature has increased.

[0094] Meanwhile, in the air conditioner 50, each component operates to dehumidify the vehicle interior. As a result, the compressor 59 operates to circulate the refrigerant along the refrigerant line 51. Here, the refrigerant line 51 connecting the sub-condenser 54 and the evaporator 56 is opened by the operation of the first expansion valve 55. The refrigerant connection line 61 is closed by the operation of the second expansion valve 63. The refrigerant supplied to the condenser 53 can increase the temperature of the coolant while exchanging heat with the coolant circulating through the heating line 41. The coolant with the increased temperature is supplied to the heater 52a.

[0095] Meanwhile, the expanded refrigerant supplied to the evaporator 56 by the operation of the first expansion valve 55 is heat exchanged with the outside air passing through the evaporator 56, and then supplied to the compressor 59 via the accumulator 57. That is, the refrigerant that has passed through the evaporator 56 passes through the accumulator 57 and is supplied to the compressor 59. Then, the refrigerant compressed in a high-temperature and high-pressure state from the compressor 59 flows into the condenser 53. Here, the opening and closing door 52b is opened so that the outside air that has flowed into the HVAC module 52 and passed through the evaporator 56 passes through the heater 52a. That is, the outside air that flows into the HVAC module 52 is dehumidified while passing through the evaporator 56 by the low-temperature refrigerant that has flowed into the evaporator 56. Then, the refrigerant is converted into a high-temperature state while passing through the heater 52a, and flows into the passenger compartment, thereby heating and dehumidifying the passenger compartment.

[0096] The heat pump system according to the present embodiment can reduce the power consumption of the compressor 59 and improve the heating efficiency by utilizing the waste heat generated from the condenser 53 to increase the temperature of the refrigerant in the heating and dehumidification modes of the vehicle. The operation for increasing the temperature of the battery module 24 will now be described with reference to FIG. 8.

[0097] 8 is a diagram showing an operation state of the heat pump system for a vehicle according to an embodiment of the present invention with respect to a temperature rise of a battery module. Referring to FIG. 8, the cooling device 10, the heating device 40, and the air conditioner device 50 are stopped operating. Here, the battery coolant line 21 is disconnected from the coolant line 11 by the operation of the first valve V1. That is, the battery coolant line 21 connecting the second water pump 22, the battery module 24, and the coolant heater 26 in the battery cooling device 20 is opened.

[0098] In this state, the second water pump 22 is operated to circulate the coolant along the battery coolant line 21. Here, the coolant heater 26 operates to heat the coolant supplied to the battery module 24 along the opened battery coolant line 21. Then, the temperature of the coolant circulating in the battery coolant line 21 increases as it passes through the coolant heater 26. The coolant whose temperature has increased as it passes through the coolant heater 26 is supplied to the battery module 24, thereby increasing the temperature of the battery module 24.

[0099] That is, the present invention can rapidly increase the temperature of the battery module 24 by repeating this process, and can efficiently manage the temperature of the battery module 24. Therefore, according to the vehicle heat pump system according to the embodiment of the present invention as described above, the temperature of the battery module 24 is adjusted according to the vehicle mode using one chiller 30 in which the coolant and the refrigerant exchange heat, and the vehicle interior is heated using the coolant, thereby simplifying and simplifying the entire system. In addition, the present invention can improve heating efficiency by recovering waste heat generated from the electrical equipment 15 and using it for interior heating.

[0100] In addition, the present invention can achieve optimal performance of the battery module 24 by efficiently regulating the temperature of the battery module 24, and can increase the overall driving range of the vehicle by efficiently managing the battery module 24. Furthermore, the present invention can reduce manufacturing costs and weight by simplifying the entire system, and can improve space utilization. [Explanation of symbols]

[0101] 10 Cooling device 11 Cooling water line 12 Radiator 13 Cooling fan 14, 22, 42 No. 1, No. 2, and No. 3 Water Pumps 15 Electrical equipment 16 Reservoir tank 17 Supply Line 20 Battery Cooling System 21 Battery coolant line 24 Battery Module 26 Cooling water heater 30 Chiller 31 Chiller connection line 40 Heating Equipment 41 Heating circuit 50 Air conditioning unit 51 Refrigerant Line 52 HVAC Module 52a Heater 52b Opening and closing door 52c Air heater 53 Capacitor 54 Sub capacitor 55, 63 1st and 2nd expansion valves 56 Evaporator 57 Accumulator 59 Compressor 61 Refrigerant connection line V1, V2 1st and 2nd valves

Claims

1. a cooling device including a radiator connected to the cooling water line, a first water pump, a first valve, a second valve, and a reservoir tank, and configured to circulate cooling water through the cooling water line so as to cool at least one electrical component provided in the cooling water line; a battery cooling device including: a battery coolant line connected to the coolant line through the first valve; a second water pump connected to the battery coolant line; and a battery module, the battery cooling device circulating coolant through the battery module; a heating line selectively connected to the cooling water line through a second valve to heat a vehicle interior using the cooling water, a third water pump provided in the heating line, and a heater; and a chiller that is provided in the battery coolant line between the first valve and the battery module, that is connected to a chiller connection line through the second valve, that is connected to a refrigerant line of an air conditioner through a refrigerant connection line, and that adjusts a temperature of the coolant by exchanging heat between the coolant circulating through the battery coolant line and a refrigerant selectively supplied from the air conditioner; The reservoir tank includes: a cooling water line between the radiator and the first valve, and connected to the cooling water line connecting the first valve and the first water pump through a supply line.

2. The heater is 2. The heat pump system for a vehicle according to claim 1, wherein the heat pump system is provided inside an HVAC module included in the air conditioner.

3. The battery cooling device includes: The heat pump system for a vehicle according to claim 1 , further comprising a coolant heater provided in the battery coolant line between the battery module and the chiller.

4. When increasing the temperature of the battery module, The battery coolant line is disconnected from the coolant line by the operation of the first valve, The second water pump is operated to circulate the cooling water along the battery cooling water line, 4. The vehicle heat pump system according to claim 3, wherein the coolant heater is operative to heat the coolant supplied to the battery module along the battery coolant line.

5. The air conditioner device is an HVAC module including an evaporator connected through the refrigerant line and an opening / closing door for selectively controlling the flow of outside air passing through the evaporator into the heater according to a cooling, heating, or dehumidification mode of the vehicle; a condenser provided in the heating line between the second valve and the heater, through which cooling water circulates and which exchanges heat between the refrigerant supplied through the refrigerant line and the cooling water; a compressor connected between the evaporator and the condenser through the refrigerant line; a first expansion valve provided in the refrigerant line between the condenser and the evaporator; and 2. The heat pump system according to claim 1, further comprising a second expansion valve provided in the refrigerant connecting line.

6. The air conditioner device is a sub-condenser provided in the refrigerant line between the condenser and the evaporator; and 6. The heat pump system of claim 5, further comprising: an accumulator disposed in the refrigerant line between the evaporator and the compressor and connected to the refrigerant connection line.

7. one end of the refrigerant connection line is connected to the refrigerant line between the sub condenser and the first expansion valve; 7. The heat pump system of claim 6, wherein the other end of the refrigerant connection line is connected to the accumulator between the evaporator and the compressor.

8. 7. The vehicle heat pump system according to claim 6, wherein the chiller and the condenser are water-cooled heat exchangers, and the sub-condenser is an air-cooled heat exchanger.

9. The HVAC module includes:

6. The heat pump system of claim 5, further comprising an air heater disposed between the heater and the evaporator to selectively heat outside air flowing into the heater.

10. The air heater comprises:

10. The heat pump system for a vehicle according to claim 9, wherein the heat pump system is operated to increase the temperature of outside air flowing into the heater when the temperature of the coolant supplied to the heater is lower than a target temperature for heating the interior of the vehicle.

11. When the battery module is cooled using a refrigerant, In the cooling device, the first water pump is operated to circulate the cooling water through the cooling water line, and the supply line is opened. The chiller connecting line is closed by the operation of the second valve, The operation of the heating device is stopped, In the battery cooling device, the second water pump is operated to circulate cooling water through the battery cooling water line, the cooling device and the battery cooling device form independent closed circuits through which cooling water circulates by operation of the first valve, In the air conditioner, the refrigerant line connected to the evaporator is closed by the operation of the first expansion valve, and the refrigerant connection line is opened by the operation of the second expansion valve, 6. The heat pump system according to claim 5, wherein the second expansion valve expands the refrigerant supplied to the refrigerant connection line and supplies the refrigerant to the chiller.

12. When the battery module is cooled in a vehicle cooling mode, In the cooling device, the first water pump is operated to circulate the cooling water through the cooling water line, and the supply line is opened. The chiller connecting line is closed by the operation of the second valve, In the heating device, in a state in which the cooling water line and the heating line are connected by the operation of the second valve, the cooling water is circulated through the heating line by the operation of the third water pump, In the battery cooling device, the second water pump is operated to circulate cooling water through the battery cooling water line, the cooling device and the battery cooling device form independent closed circuits through which cooling water circulates by operation of the first valve, In the air conditioner, the first expansion valve is operated to open the refrigerant line connected to the evaporator, and the second expansion valve is operated to open the refrigerant connection line, 6. The heat pump system according to claim 5, wherein the second expansion valve expands the refrigerant supplied to the refrigerant connection line and supplies the refrigerant to the chiller.

13. When the vehicle is in heating and dehumidifying mode, The cooling device and the battery cooling device stop operating, The second valve is operated to close the cooling water line and the chiller connecting line, and in the heating device, the third water pump is operated to circulate the cooling water along the heating line, 6. The vehicle heat pump system according to claim 5, wherein in the air conditioning device, the refrigerant connection line is closed by operation of the second expansion valve, and the refrigerant is circulated along the refrigerant line by operation of the compressor.

14. When recovering waste heat from the electrical equipment and the condenser in a vehicle heating mode, In the cooling device, the cooling water line connected to the radiator and the cooling water line connecting the radiator and the reservoir tank are closed, and the supply line is opened; The remaining battery cooling water lines except the battery cooling water line connected to the chiller are closed by the operation of the first valve, The chiller connecting line is opened by the operation of the second valve, The cooling water, the temperature of which has increased while passing through the electrical equipment due to the operation of the first water pump, is supplied to the chiller along the opened cooling water line and the opened chiller connection line without passing through the radiator, The third water pump is operated to circulate cooling water along the heating line, A portion of the cooling water stored in the reservoir tank is circulated along the cooling water line through the open supply line, The cooling device and the heating device each form an independent closed circuit through which cooling water circulates by operating the second valve, In the air conditioner, the refrigerant line connected to the evaporator is closed by the operation of the first expansion valve, and the refrigerant connection line is opened by the operation of the second expansion valve, The operation of the compressor circulates a refrigerant along the refrigerant line, 6. The heat pump system according to claim 5, wherein the second expansion valve expands the refrigerant supplied to the refrigerant connection line and supplies the refrigerant to the chiller.

15. In the case where the electrical equipment and the battery module are cooled using the cooling water cooled by the radiator, The chiller connecting line is closed by the operation of the second valve, the battery coolant line is connected to the coolant line by the operation of the first valve; The cooling water cooled by the radiator and stored in the reservoir tank is supplied to the battery module while circulating through the battery cooling water line by operation of the first valve and the second water pump, The cooling water circulated through the battery cooling device is supplied to the electrical equipment while circulating through the cooling water line by operation of the first water pump, 2. The heat pump system for a vehicle according to claim 1, wherein a portion of the coolant stored in the reservoir tank circulates along the coolant line through the open supply line.

16. When using waste heat from the electrical equipment in the vehicle heating mode, In the cooling device, the cooling water line connected to the radiator and the cooling water line connecting the radiator and the reservoir tank are closed, and the supply line is opened; The remaining battery cooling water lines except the battery cooling water line connected to the chiller are closed by the operation of the first valve, The chiller connecting line is opened by the operation of the second valve, In the heating device, the cooling water line and the heating line are connected by operation of the second valve, The cooling water, the temperature of which increases while passing through the electrical equipment due to the operation of the first water pump, does not pass through the radiator but flows into the heating line connected to the opened cooling water line, The cooling water flowing into the heating line is supplied to the heater by the operation of the third water pump, The cooling water discharged from the heater passes through the chiller along the opened chiller connection line and flows back into the electrical equipment, 2. The heat pump system for a vehicle according to claim 1, wherein a portion of the coolant stored in the reservoir tank circulates along the open coolant line through the open supply line.

17. The second valve is 17. The heat pump system for a vehicle according to claim 16, wherein, when the electrical equipment is overheated, the coolant line connected to the radiator is opened to allow a portion of the coolant that has passed through the electrical equipment to flow into the heating line and the remaining coolant to flow into the radiator.

18. 2. The vehicle heat pump system according to claim 1, wherein the first valve is a four-way valve, and the second valve is a five-way valve capable of flow distribution.

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

20. 2. The heat pump system of claim 1, wherein the supply line is connected to the coolant line when the coolant circulates through the coolant line due to the operation of the first water pump.

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