CN113386526B - Indirect heat pump air conditioning system, control method and pure electric vehicle - Google Patents

Indirect heat pump air conditioning system, control method and pure electric vehicle Download PDF

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Publication number
CN113386526B
CN113386526B CN202110872119.8A CN202110872119A CN113386526B CN 113386526 B CN113386526 B CN 113386526B CN 202110872119 A CN202110872119 A CN 202110872119A CN 113386526 B CN113386526 B CN 113386526B
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China
Prior art keywords
way valve
battery pack
cooling liquid
controlled
coolant
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CN202110872119.8A
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CN113386526A (en
Inventor
徐邦杰
宋暖
徐丽青
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Deep Blue Automotive Technology Co ltd
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Chongqing Changan New Energy Automobile Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
    • B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
    • B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
    • B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
    • B60H1/03—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant and from a source other than the propulsion plant
    • B60H1/034—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant and from a source other than the propulsion plant from the cooling liquid of the propulsion plant and from an electric heating device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
    • B60H1/14—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant otherwise than from cooling liquid of the plant, e.g. heat from the grease oil, the brakes, the transmission unit
    • B60H1/143—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant otherwise than from cooling liquid of the plant, e.g. heat from the grease oil, the brakes, the transmission unit the heat being derived from cooling an electric component, e.g. electric motors, electric circuits, fuel cells or batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6571—Resistive heaters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/66—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
    • H01M10/663—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells the system being an air-conditioner or an engine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
    • B60H2001/00307—Component temperature regulation using a liquid flow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Electromagnetism (AREA)
  • Automation & Control Theory (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

When the passenger compartment is started for refrigeration and heating, the vehicle-mounted air-conditioning refrigerant is indirectly exchanged with the cooling liquid loop, the refrigeration working medium is not directly introduced into the passenger compartment, and the safety risk caused by combustion and explosion of the refrigerant working medium is greatly reduced. The system comprises: a first refrigerant circulation circuit; a second refrigerant circulation circuit; a first coolant circulation loop; a second coolant circulation loop; the first cooling liquid circulation loop and the second cooling liquid circulation loop are communicated through a first three-way valve, a second three-way valve, a third three-way valve and a fourth three-way valve, and the cooling liquid in the second cooling liquid circulation loop flows into the first cooling liquid circulation loop and then flows back to the second cooling liquid circulation loop or the cooling liquid in the first cooling liquid circulation loop and the cooling liquid in the second cooling liquid circulation loop independently flow through controlling the first three-way valve, the second three-way valve, the third three-way valve and the fourth three-way valve.

Description

Indirect heat pump air conditioning system, control method and pure electric vehicle
Technical Field
The invention relates to an electric automobile heat pump air-conditioning system, in particular to an indirect heat pump air-conditioning system for indirect heat exchange of a heat exchange core body for heating and cooling of a vehicle passenger compartment, a control method and a pure electric automobile.
Background
Because of the advantages of high efficiency and energy saving of the heat pump system, each large automobile factory starts the development of the heat pump system, but the traditional R134a refrigerant is limited by physical characteristics, the system efficiency is low in the environment of lower than-10 ℃, and the requirement of heating the passenger compartment cannot be met, and each large main engine factory searches for a new heat pump air-conditioning refrigerant, such as: R410A, CO2 and the like, but all substitutes have the defects of high flammability or high system pressure, and the traditional automobile air-conditioning evaporator is directly placed in a passenger compartment, so that if a refrigerating working medium is directly introduced into the passenger compartment, higher safety risk exists.
Disclosure of Invention
When the passenger compartment is started for refrigeration and heating, the vehicle-mounted air-conditioning refrigerant is indirectly subjected to heat exchange with the cooling liquid loop, the refrigeration working medium is not directly introduced into the passenger compartment, and the safety risk caused by combustion and explosion of the refrigerant working medium is greatly reduced.
The technical scheme of the invention is as follows:
the invention provides an indirect heat pump air conditioning system, comprising:
a first refrigerant circulation circuit which is a path for circulating a refrigerant and forms a heat pump cycle;
a second refrigerant circulation circuit that is a path through which a refrigerant circulates and forms a refrigeration cycle, the second refrigerant circulation circuit sharing a part of the path with the first refrigerant circulation circuit, and the first refrigerant circulation circuit and the second refrigerant circulation circuit do not coexist;
a first cooling liquid circulation loop of a cooling liquid circulation path is formed by the cooling liquid in the first water storage bottle;
a second cooling liquid circulation loop which forms a cooling liquid circulation path by the cooling liquid in the second water storage bottle; the first cooling liquid circulation loop and the second cooling liquid circulation loop are communicated through a first three-way valve, a second three-way valve, a third three-way valve and a fourth three-way valve, and the cooling liquid in the second cooling liquid circulation loop flows into the first cooling liquid circulation loop and then flows back to the second cooling liquid circulation loop or the cooling liquid in the first cooling liquid circulation loop and the cooling liquid in the second cooling liquid circulation loop independently flow by controlling the first three-way valve, the second three-way valve, the third three-way valve and the fourth three-way valve; wherein,
a battery cooler belonging to the first refrigerant circulation circuit and realizing heat exchange between low-temperature and low-pressure refrigerant and the cooling liquid in the first cooling liquid circulation circuit so as to cool the passenger compartment and/or the battery pack;
a water-cooled condenser subordinate to the second refrigerant circulation loop, and used for realizing heat exchange between the high-temperature and high-pressure refrigerant and the cooling liquid in the first cooling liquid circulation loop, so that the passenger compartment and/or the battery pack are heated;
and a motor belonging to the second coolant circulation circuit, wherein when the first coolant circulation circuit and the second coolant circulation circuit are communicated with each other, the coolant in the second coolant circulation circuit is heated, and the coolant in the second coolant circulation circuit flows into the first coolant circulation circuit, so that the passenger compartment and/or the battery pack are heated.
Preferably, the motor radiator belonging to the second coolant circulation circuit radiates heat of the coolant in the second coolant circulation circuit to the ambient air by the reinforcement of the cooling fan, so that the motor is cooled.
Preferably, the first coolant circulation circuit further includes:
a battery pack having a coolant inlet communicating with the coolant outlet of the first three-way valve and the coolant outlet of the third three-way valve, and a coolant outlet communicating with the coolant inlet of the second three-way valve;
a heat exchange core configured to provide heating or cooling to the passenger compartment, a coolant inlet thereof communicating with the coolant outlet of the first three-way valve, and a coolant outlet thereof communicating with the coolant inlet of the fourth three-way valve;
a coolant inlet of the heating water pump is communicated with a coolant outlet of the battery cooler, a coolant outlet of the water-cooled condenser, a coolant outlet of the first water storage bottle and a coolant outlet of the third three-way valve, and a coolant outlet of the heating water pump is communicated with a coolant outlet of the first three-way valve;
and a cooling liquid outlet of the fourth three-way valve is also communicated with a cooling liquid inlet of the battery cooler and a cooling liquid inlet of the water-cooled condenser.
Preferably, the second coolant circulation circuit includes:
a cooling liquid inlet of the motor radiator is communicated with a cooling liquid outlet of the third three-way valve;
a cooling water pump, wherein a cooling liquid inlet of the cooling water pump is communicated with a cooling liquid outlet of the second water storage bottle, a cooling liquid outlet of a motor radiator and a cooling liquid outlet of the second three-way valve, and a cooling liquid outlet of the cooling water pump is communicated with a cooling liquid inlet of the motor;
and a cooling liquid outlet of the motor is communicated with a cooling liquid outlet of the second water storage bottle and a cooling liquid inlet of the third three-way valve.
Preferably, the first coolant circulation circuit further includes:
and the air heating PTC is arranged in parallel with the heat exchange core body, and heats the cooling liquid entering the heat exchange core body to heat the passenger compartment.
Preferably, the first refrigerant circulation circuit includes:
the compressor, the water-cooled condenser, the first stop valve, the condenser, the electronic expansion valve, the battery cooler and the gas-liquid separator are sequentially arranged, and a refrigerant outlet of the gas-liquid separator is communicated with a refrigerant inlet of the compressor;
the second refrigerant circulation circuit includes:
the compressor, the water-cooled condenser, the external electronic expansion valve, the condenser, the second stop valve and the gas-liquid separator are sequentially arranged, and a refrigerant outlet of the gas-liquid separator is communicated with a refrigerant inlet of the compressor;
the first stop valve and the external electronic expansion valve are arranged in parallel;
the first refrigerant circulating loop and the second refrigerant circulating loop share the path among the gas-liquid separator, the compressor and the water-cooled condenser and the condenser;
the first refrigerant circulation circuit or the second refrigerant circulation circuit is formed by controlling the states of the compressor, the external electronic expansion valve, the first stop valve, the second stop valve and the electronic expansion valve.
The invention provides a control method of an indirect heat pump air conditioning system, which is applied to the indirect heat pump air conditioning system and comprises the following steps:
judging whether the vehicle has a cooling and/or heating demand currently;
when detecting that a user has a heating requirement of a passenger compartment, judging whether a battery pack has the heating requirement;
if the battery pack has the heating requirement, judging whether the battery pack is being charged;
if the battery pack is not charged, the compressor, the external electronic expansion valve, the second stop valve, the heating water pump and the cooling water pump are controlled to be conducted, the first three-way valve is controlled to be conducted with the heating water pump and the heat exchange core body, the third three-way valve is controlled to be conducted with the motor and the battery pack, the fourth three-way valve is controlled to be conducted with the heat exchange core body and a cooling liquid inlet of the water-cooled condenser, and the second three-way valve is controlled to be conducted with the battery pack and the cooling water pump;
if the battery pack is being charged, judging whether the current ambient temperature T1 of the vehicle is less than a first preset temperature T1;
if the current environment temperature T1 is lower than a first preset temperature T1, the compressor, the external electronic expansion valve, the second stop valve, the heating water pump and the cooling water pump are controlled to be communicated, the first three-way valve is controlled to be communicated with the heating water pump and the heat exchange core body, the third three-way valve is controlled to be communicated with the motor and the battery pack, the fourth three-way valve is controlled to be communicated with the heat exchange core body and the cooling liquid inlet of the water-cooled condenser, and the second three-way valve is controlled to be communicated with the battery pack and the cooling water pump;
if the current ambient temperature T1 is greater than or equal to a first preset temperature T1, the compressor, the external electronic expansion valve, the second stop valve and the heating water pump are controlled to be conducted, the first three-way valve is controlled to be conducted with the heating water pump and the heat exchange core body and the heating water pump and the battery pack, the second three-way valve is controlled to be conducted with the battery pack and the fourth three-way valve, and the fourth three-way valve is controlled to be conducted with the cooling liquid inlet of the heat exchange core body and the water-cooled condenser and the cooling liquid inlet of the battery pack and the water-cooled condenser.
Preferably, the method further comprises:
if the battery pack does not have the heating requirement, judging whether the battery pack has the cooling requirement;
if the battery pack has a refrigeration requirement, controlling the compressor, the first stop valve, the electronic expansion valve and the heating water pump to be communicated, controlling the air heating electric heating PTC to be started, controlling the first three-way valve to be communicated with the heating water pump and the battery pack, and controlling the second three-way valve and the fourth three-way valve to be communicated with the battery pack and a cooling liquid inlet of the battery cooler together;
if the battery pack does not have the refrigeration requirement, the compressor, the first stop valve, the electronic expansion valve and the heating water pump are controlled to be communicated, the first three-way valve is controlled to be communicated with the heating water pump and the heat exchange core body, and the fourth three-way valve is controlled to be communicated with the heat exchange core body and a cooling liquid inlet of the water-cooled condenser.
Preferably, upon detecting that the user has a passenger compartment heating demand, the method further comprises:
if only the battery pack has the heating requirement, judging whether the battery pack is charging;
if the battery pack is being charged, controlling the cooling water pump to start, controlling the third three-way valve to conduct the motor and the battery pack, and controlling the second three-way valve to conduct the battery pack and the cooling water pump;
if the battery pack is not charged, if the battery pack is being charged, judging whether the current ambient temperature T1 of the vehicle is less than a first preset temperature T1;
if the current environment temperature T1 is lower than the first preset temperature T1, the cooling water pump is controlled to be started, the third three-way valve is controlled to conduct the motor and the battery pack, and the second three-way valve is controlled to conduct the battery pack and the cooling water pump;
if the current environment temperature T1 is greater than or equal to the first preset temperature T1, the compressor, the external electronic expansion valve, the second stop valve, the heating water pump and the cooling water pump are controlled to be communicated, the first three-way valve is controlled to be communicated with the heating water pump and the heat exchange core body, the third three-way valve is controlled to be communicated with the motor and the battery pack, and the second three-way valve and the fourth three-way valve are controlled to be communicated with the battery pack and the gas-liquid separator together.
Preferably, the method further comprises:
when only a user has a passenger compartment cooling demand, controlling a heating water pump to start, controlling a compressor, a first stop valve and an electronic expansion valve to start, controlling a first three-way valve to conduct the heating water pump and a heat exchange core body, and controlling a fourth three-way valve to conduct the heat exchange core body and a cooling liquid inlet of a battery cooler;
when only the battery pack is detected to have a cooling requirement, controlling a heating water pump to start, controlling a compressor, a first stop valve and an electronic expansion valve to start, controlling a first three-way valve to conduct the battery pack and the heating water pump, and controlling a fourth three-way valve to conduct the battery pack and a cooling liquid inlet of a battery cooler;
when detecting that the user has passenger cabin cooling demand and the battery package has the cooling demand, then control the heating water pump and start, control compressor, first cut-off valve, electronic expansion valve start, control first three-way valve and switch on heating water pump and heat transfer core, control the fourth three-way valve and switch on the coolant liquid entry of heat transfer core and battery cooler, control first three-way valve and switch on battery package and heating water pump, control the fourth three-way valve and switch on the coolant liquid entry of battery package and battery cooler.
The invention also provides an automobile comprising the indirect heat pump air conditioning system.
The invention has the beneficial effects that:
the air conditioning loop and the cooling loop exchange heat through a water-cooled condenser and a battery cooler. The air conditioning loop absorbs heat from ambient air through the condenser, the heat of the air conditioning loop is transferred to the cooling loop through the water-cooled condenser, and then the heat is transferred to the passenger compartment through the heat exchange core body in the cooling loop to be heated; the heat of the passenger compartment is absorbed by the heat exchange core body of the cooling loop to be cooled, the heat of the cooling loop is transferred to the air-conditioning loop through the battery cooler, and the heat of the air-conditioning loop is dissipated into the ambient air through the condenser. Through the mode of condenser, water-cooled condenser, battery cooler, heat transfer of heat exchange core body, avoid the refrigeration working medium in the air conditioning return circuit directly to input passenger cabin, greatly reduced the safe risk that novel refrigerant working medium (R410A, CO2 etc.) burning or blasting brought.
Drawings
FIG. 1 is a schematic diagram of the overall architecture of an indirect heat pump air conditioning system of the present invention;
FIG. 2 is a schematic view of the principle of using a heat pump to heat the passenger compartment and a motor to heat the battery pack;
FIG. 3 is a schematic view of the heating of the passenger compartment and the battery pack using a heat pump;
FIG. 4 is a schematic view of the principle of using a heat pump to cool the battery pack and using a warm-air electrically heated PTC to heat the passenger compartment;
FIG. 5 is a schematic view of the heating of the passenger compartment using a heat pump;
FIG. 6 is a schematic diagram of the principle of using a heat pump to refrigerate a battery pack;
FIG. 7 is a schematic diagram of the principle of heating a battery pack using a motor;
FIG. 8 is a schematic diagram of the heating of a battery pack using a heat pump;
FIG. 9 is a schematic view of the principle of using a heat pump to cool a passenger compartment;
FIG. 10 is a schematic view of the principle of using a heat pump to cool the passenger compartment and the battery pack;
FIG. 11 is a schematic flow chart of a portion of a method in an embodiment of the present invention;
FIG. 12 is a schematic flow chart of another portion of a method in an embodiment of the present invention;
the reference numerals shown in the figures denote: 101: a compressor; 102: a water-cooled condenser; 103: an external electronic expansion valve; 106: an electronic expansion valve; 104: a condenser; 105: a first shut-off valve; 120: a second stop valve; 107: a battery cooler; 108: a gas-liquid separator; 109: a heating water pump; 114: a cooling water pump; 110: 111 a second three-way valve; 112: a third three-way valve; 113: a fourth three-way valve; 115: a heat exchange core body; 116: the air heating PTC is electrically heated; 118: a battery pack; 117: a motor radiator; 119: an electric motor.
Detailed Description
Referring to fig. 1, the present invention provides an indirect heat pump air conditioning system that includes an air conditioning circuit and a cooling circuit. Wherein, the air conditioning circuit includes: a compressor 101, a water-cooled condenser 102, an external electronic expansion valve 106, a second stop valve 105, a condenser 104, a first stop valve 120105, an electronic expansion valve 106, a battery cooler 107, and a gas-liquid separator 108; the first cut-off valve 120 and the external electronic expansion valve 106 are arranged in parallel. The cooling circuit includes: heating water pump 109, cooling water pump 114, three-way valve 110/111/112/113, heat exchange core 115, battery cooler 107, water-cooled condenser 102, battery pack 118, motor radiator 117, and motor 119.
Specifically, the air conditioning circuit is configured such that the first refrigerant circulation circuit and the second refrigerant circulation circuit do not coexist in the air conditioning circuit by controlling the opening and closing of the valve. The first refrigerant circulation circuit is a path for circulating a refrigerant and can form a heat pump cycle; the second refrigerant circulation circuit is a path through which a refrigerant circulates, and can form a refrigeration cycle. The second refrigerant circulation circuit shares a part of the path with the first refrigerant circulation circuit.
Specifically, the first refrigerant circulation circuit includes the above-described compressor 101, a water-cooled condenser 102, an external electronic expansion valve 106, a second shutoff valve 105, a condenser 104, and a gas-liquid separator 108. The intermediate compressor 101 is used for compressing a low-pressure low-temperature gaseous refrigeration working medium into a high-temperature high-pressure gaseous refrigeration working medium, and transferring heat of an air conditioning loop into a cooling loop through the water-cooled condenser 102, so that the phase change of the refrigerant working medium from a high-pressure gaseous state to a high-pressure liquid state is caused, and after the flow is intercepted by the external electronic expansion valve 106, the refrigerant working medium is changed from the high-pressure liquid state to a low-pressure two-phase state, and then absorbs heat of ambient air through the condenser 104, and finally flows to the gas-liquid separator 108 through the second stop valve 105, and then returns to the compressor 101.
Specifically, the second refrigerant circulation circuit includes the above-described compressor 101, water-cooled condenser 102, first stop valve 120, electronic expansion valve 106, condenser 104, battery cooler 107, and gas-liquid separator 108. In the second refrigerant circulation circuit, the water-cooled condenser 102 functions only as a path through which the refrigerant can pass. The compressor 101 is configured to compress a low-pressure low-temperature gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant, and radiate refrigerant heat of the air conditioning loop to ambient air through the condenser 104, so as to cause a phase change of the refrigerant from a high-temperature high-pressure gaseous state to a low-temperature high-pressure liquid state, and after the refrigerant is intercepted by the electronic expansion valve 106, the refrigerant is changed from the high-pressure liquid state to a low-pressure two-phase state, and then the refrigerant passes through the battery cooler 107 to absorb water heat in the cooling loop, and finally returns to the compressor 101 through the gas-liquid separator 108.
The first refrigerant circulation circuit and the second refrigerant circulation circuit share the path among the gas-liquid separator 108, the compressor 101, the water-cooled condenser 102, and the condenser 104; the first refrigerant circulation circuit or the second refrigerant circulation circuit is formed by controlling the states of the compressor 101, the external electronic expansion valve 106, the first stop valve 120, the second stop valve 105, and the electronic expansion valve 106.
The cooling circuit forms a first cooling liquid circulation circuit forming a cooling liquid circulation path by the cooling liquid in the first water storage bottle and a second cooling liquid circulation circuit forming a cooling liquid circulation path by the cooling liquid in the second water storage bottle by controlling the first three-way valve 110, the second three-way valve 111, the third three-way valve 112 and the fourth three-way valve 113 inside. Specifically, the first three-way valve 110, the second three-way valve 111, the third three-way valve 112, and the fourth three-way valve 113 are controlled so that the coolant in the second coolant circulation circuit flows into the first coolant circulation circuit and then flows back into the second coolant circulation circuit, or the coolant in the first coolant circulation circuit and the coolant in the second coolant circulation circuit flow independently.
In the present embodiment, the passenger compartment and/or the battery pack 118 is cooled by the heat exchange of the low-temperature and low-pressure refrigerant with the coolant in the first coolant circulation circuit, which is achieved by the battery cooler 107 belonging to the first coolant circulation circuit;
a water-cooled condenser 102 belonging to the second refrigerant circulation circuit, which performs heat exchange between the high-temperature and high-pressure refrigerant and the coolant in the first coolant circulation circuit, so that the passenger compartment and/or the battery pack 118 are heated;
a motor 119 belonging to the second coolant circulation circuit, which heats the coolant in the second coolant circulation circuit when communicating between the first coolant circulation circuit and the second coolant circulation circuit, the coolant in the second coolant circulation circuit causing the passenger compartment and/or the battery pack 118 to be heated by flowing into the first coolant circulation circuit;
the motor radiator 117 belonging to the second coolant circulation circuit radiates heat of the coolant in the second coolant circulation circuit to the ambient air by the reinforcement of the cooling fan, so that the motor 119 is cooled.
Referring to fig. 1, in this embodiment, the first cooling liquid circulation loop specifically includes: the first water storage bottle; a battery pack 118 having a coolant inlet communicating with the coolant outlet of the first three-way valve 110 and the coolant outlet of the third three-way valve 112, and a coolant outlet communicating with the coolant inlet of the second three-way valve 111; a heat exchange core 115 configured to provide heating or cooling to the passenger compartment, a coolant inlet thereof being communicated with a coolant outlet of the first three-way valve 110, and a coolant outlet thereof being communicated with a coolant inlet of the fourth three-way valve 113; a heating water pump 109 having a coolant inlet connected to the coolant outlet of the battery cooler 107, the coolant outlet of the water-cooled condenser 102, the coolant outlet of the first reservoir bottle, and the coolant outlet of the third three-way valve 112, and having a coolant outlet connected to the coolant outlet of the first three-way valve 110; the coolant outlet of the fourth three-way valve 113 is also communicated with the coolant inlet of the battery cooler 107 and the coolant inlet of the water-cooled condenser 102; and a wind-heating electric heating PTC116, which is arranged in parallel with the heat exchange core 115, heats the passenger compartment by heating the coolant entering the heat exchange core 115.
Referring to fig. 1, the second coolant circulation circuit includes: a motor radiator 117 whose coolant inlet communicates with the coolant outlet of the third three-way valve 112; a cooling water pump, a cooling liquid inlet of which is communicated with a cooling liquid outlet of the second water storage bottle, a cooling liquid outlet of the motor radiator 117 and a cooling liquid outlet of the second three-way valve 111, and a cooling liquid outlet of which is communicated with a cooling liquid inlet of the motor 119; the coolant outlet of the motor 119 is communicated with the coolant outlet of the second reservoir bottle and the coolant inlet of the third three-way valve 112.
Referring to fig. 11 and 12, the indirect heat pump air conditioning system according to the present embodiment is implemented by the following logic in order to implement these functions.
Step S101, judging whether the vehicle has a cooling and/or heating demand currently.
At this time, the cooling demand of the vehicle may be: any one or more of the requirements for passenger compartment cooling, battery pack 118 cooling, and electric motor 119 cooling. For example, the refrigeration requirements of the vehicle may be: passenger compartment cooling and battery pack 118 cooling requirements, passenger compartment cooling and electric drive cooling requirements, electric motor 119 cooling requirements and battery pack 118 cooling requirements, and the three requirements described above.
The heating requirement of the vehicle may be: passenger compartment heating and/or battery pack 118 heating requirements.
Wherein the heating requirement or the cooling requirement of the battery pack 118 is determined by a battery heating or cooling requirement signal sent by the battery manager. The cooling requirement of the motor 119 is judged by the temperature collected by the temperature sensor of the motor 119 and the ambient temperature of the vehicle. The passenger compartment cooling or heating requirements are actively placed by the user.
In step S102, if it is detected that the user has a heating requirement of the passenger compartment, it is determined whether the battery pack 118 has a heating requirement.
In step S103, if the battery pack 118 has a heating requirement, it is determined whether the battery pack 118 is being charged.
Starting, whether the battery pack 118 is being charged may be confirmed by a signal sent by the battery manager BMS.
Step S104, if the battery pack 118 is not charged, the compressor 101, the external electronic expansion valve 106, the second stop valve 105, the heating water pump 109 and the cooling water pump 114 are controlled to be conducted, the first three-way valve 110 is controlled to conduct the heating water pump 109 and the heat exchange core body 115, the third three-way valve 112 is controlled to conduct the motor 119 and the battery pack 118, the fourth three-way valve 113 is controlled to conduct the heat exchange core body 115 and a cooling liquid inlet of the water-cooled condenser 102, and the second three-way valve 111 is controlled to conduct the battery pack 118 and the cooling water pump 114.
As shown in fig. 2, in this operating state, the coolant exchanges heat with the refrigerant at the water-cooled condenser 102, the heated coolant enters the heat exchange core 115 to exchange heat with the air in the vehicle, and the heated air in the vehicle enters the passenger compartment through the air outlet, so as to heat the passenger compartment; at the same time, the heated coolant flows to the battery pack 118, heating the battery pack 118.
In step S105, if the battery pack 118 is being charged, it is determined whether the current ambient temperature T1 of the vehicle is less than the first preset temperature T1.
Step S106, if the current ambient temperature T1 is less than the first preset temperature T1, the compressor 101, the external electronic expansion valve 106, the second stop valve 105, the heating water pump 109 and the cooling water pump 114 are controlled to be conducted, the first three-way valve 110 is controlled to conduct the heating water pump 109 and the heat exchange core 115, the third three-way valve 112 is controlled to conduct the motor 119 and the battery pack 118, the fourth three-way valve 113 is controlled to conduct the heat exchange core 115 and the cooling liquid inlet of the water-cooled condenser 102, and the second three-way valve 111 is controlled to conduct the battery pack 118 and the cooling water pump 114.
As shown in fig. 2, in this operating state, the coolant exchanges heat with the refrigerant at the water-cooled condenser 102, the heated coolant enters the heat exchange core 115 to exchange heat with the air in the vehicle, and the heated air in the vehicle enters the passenger compartment through the air outlet, so as to heat the passenger compartment. Meanwhile, the heating of the battery pack 118 is realized by using the residual heat of the motor 119, and the residual heat of the motor 119 flows into the battery pack 118 through the second three-way valve 111 to heat the battery pack 118, and then flows back to the cooling water pump 114 through the third three-way valve 112.
Step S107, if the current ambient temperature T1 is greater than or equal to the first preset temperature T1, the compressor 101, the external electronic expansion valve 106, the second stop valve 105, and the heating water pump 109 are controlled to be turned on, the first three-way valve 110 is controlled to turn on the heating water pump 109 and the heat exchange core 115 and turn on the heating water pump 109 and the battery pack 118, the second three-way valve 111 is controlled to turn on the battery pack 118 and the fourth three-way valve 113, and the fourth three-way valve 113 is controlled to turn on the heat exchange core 115 and the coolant inlet of the water-cooled condenser 102 and turn on the battery pack 118 and the coolant inlet of the water-cooled condenser 102.
In this scenario, as shown in fig. 3, the battery pack 118 and the passenger compartment are heated by heat exchange between the refrigerant and the coolant at the water-cooled condenser 102.
In step S108, if the battery pack 118 does not have a heating requirement, it is determined whether the battery pack 118 has a cooling requirement.
Step S109, if the battery pack 118 has a cooling demand, the compressor 101, the first cut-off valve 120, the electronic expansion valve 106, and the heating water pump 109 are controlled to be turned on, the air heating PTC116 is controlled to be started, the heating water pump 109 and the battery pack 118 are controlled to be turned on by the first three-way valve 110, and the battery pack 118 and the coolant inlet of the battery cooler 107 are controlled to be turned on by the second three-way valve 111 and the fourth three-way valve 113 together.
In this scenario, as shown in fig. 4, the cool air in the passenger compartment is heated by the air-heating PTC116, so as to heat the passenger compartment. Meanwhile, the battery pack 118 is cooled by a refrigerant, the refrigerant and the coolant exchange heat at the battery cooler 107, and the cooled coolant flows into the battery pack 118 through the first three-way valve 110, and flows back to the battery cooler 107 through the third three-way valve 112 and the fourth three-way valve 113.
Step S110, if the battery pack 118 does not have a cooling demand, the compressor 101, the first cut-off valve 120, the electronic expansion valve 106, and the heating water pump 109 are controlled to be conducted, the heating water pump 109 and the heat exchange core 115 are controlled to be conducted by the first three-way valve 110, and the cooling liquid inlet of the heat exchange core 115 and the water-cooled condenser 102 is controlled to be conducted by the fourth three-way valve 113.
In this scenario, as shown in fig. 5, the passenger compartment only has a heating requirement, and the heating of the passenger compartment is achieved by exchanging heat between the refrigerant and the coolant at the water-cooled condenser 102.
In step S111, if only the battery pack 118 has a cooling demand, the compressor 101, the first cut-off valve 120, the electronic expansion valve 106, and the heating water pump 109 are controlled to be turned on, the heating water pump 109 and the battery pack 118 are controlled to be turned on by the first three-way valve 110, and the battery pack 118 and the coolant inlet of the battery cooler 107 are controlled to be turned on together by the second three-way valve 111 and the fourth three-way valve 113.
Referring to fig. 6, this condition corresponds to the user not having a passenger compartment heating demand. At this time, the battery pack 118 is cooled by a refrigerant, the refrigerant and the coolant exchange heat at the battery cooler 107, and the cooled coolant flows into the battery pack 118 through the first three-way valve 110, and flows back to the battery cooler 107 through the third three-way valve 112 and the fourth three-way valve 113.
In step S112, if only the battery pack 118 has a heating requirement, it is determined whether the battery pack 118 is being charged.
In step S113, if the battery pack 118 is not charged, the cooling water pump 114 is controlled to start, the third three-way valve 112 is controlled to connect the motor 119 and the battery pack 118, and the second three-way valve 111 is controlled to connect the battery pack 118 and the cooling water pump 114.
Referring to fig. 7, in this scenario, the battery pack 118 utilizes the residual heat of the motor 119 to heat.
In step S114, if the battery pack 118 is being charged, it is determined whether the current ambient temperature T1 of the vehicle is less than the first preset temperature T1.
In step S115, if the current ambient temperature T1 is less than the first preset temperature T1, the cooling water pump 114 is controlled to start, the third three-way valve 112 is controlled to connect the motor 119 and the battery pack 118, and the second three-way valve 111 is controlled to connect the battery pack 118 and the cooling water pump 114.
Referring to fig. 7, in this scenario, the battery pack 118 utilizes the residual heat of the motor 119 to heat.
Step S116, if the current ambient temperature T1 is greater than or equal to the first preset temperature T1, the compressor 101, the external electronic expansion valve 106, the second stop valve 105, the heating water pump 109, and the cooling water pump 114 are controlled to be switched on, the first three-way valve 110 is controlled to switch on the heating water pump 109 and the heat exchange core 115, the third three-way valve 112 is controlled to switch on the motor 119 and the battery pack 118, and the second three-way valve 111 and the fourth three-way valve 113 are controlled to switch on the battery pack 118 and the gas-liquid separator 108 together.
Referring to fig. 8, in this scenario, the battery pack 118 is heated by heat exchange between the refrigerant and the cooling liquid at the water cooled condenser 102.
Step S117, when it is detected that only the user has a passenger compartment cooling demand, controlling the heating water pump 109 to start, controlling the compressor 101, the first cut-off valve 120, and the electronic expansion valve 106 to start, controlling the first three-way valve 110 to communicate the heating water pump 109 with the heat exchange core 115, and controlling the fourth three-way valve 113 to communicate the heat exchange core 115 with the coolant inlet of the battery cooler 107.
Referring to fig. 9, in this scenario, cooling of the passenger compartment is achieved by exchanging heat with the coolant at the battery cooler 107 using a refrigerant.
Step S118, when it is detected that the user has a passenger compartment cooling demand and the battery pack 118 has a cooling demand, controlling the heating water pump 109 to start, controlling the compressor 101, the first cut-off valve 120, and the electronic expansion valve 106 to start, controlling the first three-way valve 110 to conduct the heating water pump 109 and the heat exchange core 115, controlling the fourth three-way valve 113 to conduct the heat exchange core 115 and the coolant inlet of the battery cooler 107, controlling the first three-way valve 110 to conduct the battery pack 118 and the heating water pump 109, and controlling the fourth three-way valve 113 to conduct the battery pack 118 and the coolant inlet of the battery cooler 107.
Referring to fig. 10, in this scenario, cooling of the passenger compartment and the battery pack 118 is achieved by exchanging heat with a coolant at the battery cooler 107 using a refrigerant.
In the system of the present embodiment, the air conditioning circuit and the cooling circuit exchange heat via the water-cooled condenser 104 and the battery cooler 107. The air conditioning loop absorbs heat from ambient air through the condenser 104, transfers the heat of the air conditioning loop to the cooling loop through the water-cooled condenser 104, and then transfers the heat to the passenger compartment for heating through the heat exchange core 115 in the cooling loop; the heat of the passenger compartment is absorbed by the heat exchange core 115 of the cooling loop to cool, and then transferred to the air conditioning loop through the battery cooler 107, and the air conditioning loop then radiates the heat to the ambient air through the condenser 104. Through the way of heat transfer of condenser 104, water-cooled condenser 104, battery cooler 107, heat exchange core 115, avoid the refrigerant in the air conditioning loop directly to input passenger cabin, greatly reduced the safety risk that novel refrigerant working medium (R410A, CO2 etc.) burning or blasting brought.
The method of the invention flexibly uses various heat sources of the current electric automobile, such as motor heat, heat pump heat and the like to heat the passenger compartment and/or the battery pack; and the refrigerant is prevented from entering the passenger compartment when the passenger compartment and/or the battery pack are refrigerated.
The invention also provides a pure electric vehicle comprising the indirect heat pump air conditioning system.

Claims (10)

1. An indirect heat pump air conditioning system comprising:
a first refrigerant circulation circuit which is a path for circulating a refrigerant and forms a heat pump cycle;
a second refrigerant circulation circuit that is a path through which a refrigerant circulates and forms a refrigeration cycle, the second refrigerant circulation circuit sharing a part of the path with the first refrigerant circulation circuit, and the first refrigerant circulation circuit and the second refrigerant circulation circuit do not coexist;
a first cooling liquid circulation loop of a cooling liquid circulation path is formed by the cooling liquid in the first water storage bottle;
a second cooling liquid circulation loop which forms a cooling liquid circulation path by the cooling liquid in the second water storage bottle; the first cooling liquid circulation loop and the second cooling liquid circulation loop are communicated through a first three-way valve (110), a second three-way valve (111), a third three-way valve (112) and a fourth three-way valve (113), and cooling liquid in the second cooling liquid circulation loop flows into the first cooling liquid circulation loop and then flows back to the second cooling liquid circulation loop or the cooling liquid in the first cooling liquid circulation loop and the cooling liquid in the second cooling liquid circulation loop independently flow by controlling the first three-way valve (110), the second three-way valve (111), the third three-way valve (112) and the fourth three-way valve (113); wherein,
a battery cooler (107) belonging to the first refrigerant circulation circuit, and performing heat exchange between a low-temperature and low-pressure refrigerant and the coolant in the first coolant circulation circuit, so that the passenger compartment and/or the battery pack (118) are cooled;
a water-cooled condenser (102) subordinate to the second refrigerant circulation circuit, and the heat exchange between the high-temperature and high-pressure refrigerant and the cooling liquid in the first cooling liquid circulation circuit is realized, so that the passenger compartment and/or the battery pack (118) are/is heated;
an electric motor (119) belonging to the second coolant circuit, which, when communicating between the first coolant circuit and the second coolant circuit, heats the coolant in the second coolant circuit, which, by flowing into the first coolant circuit, causes the passenger compartment and/or the battery pack (118) to be heated;
the first coolant circulation circuit further includes:
a battery pack (118) having a coolant inlet communicating with the coolant outlet of the first three-way valve (110) and the coolant outlet of the third three-way valve (112), and a coolant outlet communicating with the coolant inlet of the second three-way valve (111);
a heat exchange core (115) configured to provide heating or cooling to the passenger compartment, a coolant inlet thereof communicating with a coolant outlet of the first three-way valve (110), and a coolant outlet thereof communicating with a coolant inlet of a fourth three-way valve (113);
a heating water pump (109) having a coolant inlet connected to the coolant outlet of the battery cooler (107), the coolant outlet of the water-cooled condenser (102), the coolant outlet of the first reservoir bottle and the coolant outlet of the third three-way valve (112), and having a coolant outlet connected to the coolant outlet of the first three-way valve (110);
and a cooling liquid outlet of the fourth three-way valve (113) is also communicated with a cooling liquid inlet of the battery cooler (107) and a cooling liquid inlet of the water-cooled condenser (102).
2. The indirect heat pump air conditioning system of claim 1, wherein the motor radiator (117) belonging to the second coolant loop dissipates the heat of the coolant in the second coolant loop to the ambient air with the aid of a cooling fan, so that the motor (119) is cooled.
3. The indirect heat pump air conditioning system of claim 2, wherein the second coolant circulation loop comprises:
a motor radiator (117) having a coolant inlet in communication with the coolant outlet of the third three-way valve (112);
a cooling water pump (114) with a cooling liquid inlet communicated with a cooling liquid outlet of the second water storage bottle, a cooling liquid outlet of a motor radiator (117) and a cooling liquid outlet of the second three-way valve (111), and with a cooling liquid outlet communicated with a cooling liquid inlet of the motor (119);
and a cooling liquid outlet of the motor (119) is communicated with a cooling liquid outlet of the second water storage bottle and a cooling liquid inlet of the third three-way valve (112).
4. The indirect heat pump air conditioning system of claim 3, wherein the first coolant loop further comprises:
and the air heating electric heating PTC (116) is arranged in parallel with the heat exchange core body (115) and heats the passenger compartment by heating the cooling liquid entering the heat exchange core body (115).
5. The indirect heat pump air conditioning system of claim 4,
the first refrigerant circulation circuit includes:
the system comprises a compressor (101), the water-cooled condenser (102), a first stop valve (120), a condenser (104), an electronic expansion valve (106), the battery cooler (107) and a gas-liquid separator (108) which are sequentially arranged, wherein a refrigerant outlet of the gas-liquid separator (108) is communicated with a refrigerant inlet of the compressor (101);
the second refrigerant circulation circuit includes:
the system comprises a compressor (101), a water-cooled condenser (102), an external electronic expansion valve (106), a condenser (104), a second stop valve (105) and a gas-liquid separator (108), wherein the refrigerant outlet of the gas-liquid separator (108) is communicated with the refrigerant inlet of the compressor (101);
the first stop valve (120) and the external electronic expansion valve (106) are arranged in parallel;
the first refrigerant circulation loop and the second refrigerant circulation loop share the path among the gas-liquid separator (108), the compressor (101) and the water-cooled condenser (102) and the condenser (104);
the first refrigerant circulation circuit or the second refrigerant circulation circuit is formed by controlling the states of the compressor (101), the external electronic expansion valve (106), the first stop valve (120), the second stop valve (105), and the electronic expansion valve (106).
6. A control method of an indirect heat pump air conditioning system is applied to the indirect heat pump air conditioning system of claim 5, and is characterized by comprising the following steps:
judging whether the vehicle has a cooling and/or heating demand currently;
upon detecting that the user has a passenger compartment heating demand, determining whether the battery pack (118) has a heating demand;
if the battery pack (118) has a heating requirement, judging whether the battery pack (118) is charging;
if the battery pack (118) is not charged, the compressor (101), the external electronic expansion valve (106), the second stop valve (105), the heating water pump (109) and the cooling water pump (114) are controlled to be conducted, the first three-way valve (110) is controlled to conduct the heating water pump (109) and the heat exchange core body (115), the third three-way valve (112) is controlled to conduct the motor (119) and the battery pack (118), the fourth three-way valve (113) is controlled to conduct the heat exchange core body (115) and a cooling liquid inlet of the water-cooled condenser (102), and the second three-way valve (111) is controlled to conduct the battery pack (118) and the cooling water pump (114);
if the battery pack (118) is being charged, judging whether the current ambient temperature T1 of the vehicle is less than a first preset temperature T1;
if the current ambient temperature T1 is lower than a first preset temperature T1, the compressor (101), the external electronic expansion valve (106), the second stop valve (105), the heating water pump (109) and the cooling water pump (114) are controlled to be communicated, the first three-way valve (110) is controlled to be communicated with the heating water pump (109) and the heat exchange core body (115), the third three-way valve (112) is controlled to be communicated with the motor (119) and the battery pack (118), the fourth three-way valve (113) is controlled to be communicated with the heat exchange core body (115) and a cooling liquid inlet of the water-cooled condenser (102), and the second three-way valve (111) is controlled to be communicated with the battery pack (118) and the cooling water pump (114);
if the current ambient temperature T1 is greater than or equal to a first preset temperature T1, the compressor (101) is controlled, the external electronic expansion valve (106), the second stop valve (105) and the heating water pump (109) are conducted, the first three-way valve (110) is controlled to conduct the heating water pump (109) and the heat exchange core (115) and conduct the heating water pump (109) and the battery pack (118), the second three-way valve (111) is controlled to conduct the battery pack (118) and the fourth three-way valve (113), and the fourth three-way valve (113) is controlled to conduct the cooling liquid inlets of the heat exchange core (115) and the water-cooled condenser (102) and conduct the cooling liquid inlets of the battery pack (118) and the water-cooled condenser (102).
7. The method according to claim 6, wherein upon detecting that the user has a passenger compartment heating demand, the method further comprises:
if the battery pack (118) does not have the heating requirement, judging whether the battery pack (118) has the cooling requirement;
if the battery pack (118) has a refrigeration demand, the compressor (101), the first stop valve (120), the electronic expansion valve (106) and the heating water pump (109) are controlled to be conducted, the air heating electric heating PTC (116) is controlled to be started, the heating water pump (109) and the battery pack (118) are controlled to be conducted by the first three-way valve (110), and the battery pack (118) and a cooling liquid inlet of the battery cooler (107) are controlled to be conducted by the second three-way valve (111) and the fourth three-way valve (113) together;
if the battery pack (118) does not have the refrigeration requirement, the compressor (101), the first stop valve (120), the electronic expansion valve (106) and the heating water pump (109) are controlled to be communicated, the heating water pump (109) and the heat exchange core body (115) are controlled to be communicated by the first three-way valve (110), and the cooling liquid inlet of the heat exchange core body (115) and the water-cooled condenser (102) is controlled to be communicated by the fourth three-way valve (113).
8. The method of claim 6, further comprising:
if only the battery pack (118) has a heating demand, judging whether the battery pack (118) is charging;
if the battery pack (118) is being charged, controlling the cooling water pump (114) to be started, controlling the third three-way valve (112) to conduct the motor (119) and the battery pack (118), and controlling the second three-way valve (111) to conduct the battery pack (118) and the cooling water pump (114);
if the battery pack (118) is not being charged, if the battery pack (118) is being charged, whether the current ambient temperature T1 of the vehicle is less than a first preset temperature T1 is judged;
if the current environment temperature T1 is lower than the first preset temperature T1, the cooling water pump (114) is controlled to be started, the third three-way valve (112) is controlled to conduct the motor (119) and the battery pack (118), and the second three-way valve (111) is controlled to conduct the battery pack (118) and the cooling water pump (114);
if the current environment temperature T1 is greater than or equal to a first preset temperature T1, the compressor (101), the external electronic expansion valve (106), the second stop valve (105), the heating water pump (109) and the cooling water pump (114) are controlled to be conducted, the first three-way valve (110) is controlled to conduct the heating water pump (109) and the heat exchange core body (115), the third three-way valve (112) is controlled to conduct the motor (119) and the battery pack (118), and the second three-way valve (111) and the fourth three-way valve (113) are controlled to conduct the battery pack (118) and the gas-liquid separator (108) together.
9. The method according to any one of claims 6 to 8, further comprising:
when only a user has a passenger compartment cooling demand, controlling a heating water pump (109) to be started, controlling a compressor (101), a first stop valve (120) and an electronic expansion valve (106) to be started, controlling a first three-way valve (110) to conduct the heating water pump (109) and a heat exchange core body (115), and controlling a fourth three-way valve (113) to conduct the heat exchange core body (115) and a cooling liquid inlet of a battery cooler (107);
when only the battery pack (118) is detected to have a cooling demand, controlling a heating water pump (109) to start, controlling a compressor (101), a first stop valve (120) and an electronic expansion valve (106) to start, controlling a first three-way valve (110) to conduct the battery pack (118) and the heating water pump (109), and controlling a fourth three-way valve (113) to conduct the battery pack (118) and a cooling liquid inlet of a battery cooler (107);
when a user has a passenger compartment cooling demand and the battery pack (118) has the cooling demand, the heating water pump (109) is controlled to be started, the compressor (101), the first stop valve (120) and the electronic expansion valve (106) are controlled to be started, the first three-way valve (110) is controlled to conduct the heating water pump (109) and the heat exchange core (115), the fourth three-way valve (113) is controlled to conduct the heat exchange core (115) and the cooling liquid inlet of the battery cooler (107), the first three-way valve (110) is controlled to conduct the battery pack (118) and the heating water pump (109), and the fourth three-way valve (113) is controlled to conduct the cooling liquid inlet of the battery pack (118) and the cooling liquid inlet of the battery cooler (107).
10. A pure electric vehicle, characterized by comprising the indirect heat pump air conditioning system of any one of claims 1 to 5.
CN202110872119.8A 2021-07-30 2021-07-30 Indirect heat pump air conditioning system, control method and pure electric vehicle Active CN113386526B (en)

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