CN112549902B - Multi-mode refrigerant direct cooling type new energy automobile heat management unit and control method thereof - Google Patents

Multi-mode refrigerant direct cooling type new energy automobile heat management unit and control method thereof Download PDF

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CN112549902B
CN112549902B CN202011504140.4A CN202011504140A CN112549902B CN 112549902 B CN112549902 B CN 112549902B CN 202011504140 A CN202011504140 A CN 202011504140A CN 112549902 B CN112549902 B CN 112549902B
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started
reversing valve
electronic expansion
valve
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CN112549902A (en
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陈佳恒
王定标
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Zhengzhou University
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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
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • 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
    • B60H1/04—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant from cooling liquid of the plant
    • B60H1/06—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant from cooling liquid of the plant directly from main radiator
    • 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
    • B60H3/00—Other air-treating devices
    • B60H3/02—Moistening ; Devices influencing humidity levels, i.e. humidity control
    • B60H3/024—Moistening ; Devices influencing humidity levels, i.e. humidity control for only dehumidifying the air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • 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
    • H01M10/66—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
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
    • B60K2001/005—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric storage means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/008—Arrangement or mounting of electrical propulsion units with means for heating the electrical propulsion units
    • 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)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Energy (AREA)
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  • Power Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The invention provides a multi-mode refrigerant direct-cooling type new energy automobile heat management unit and a control method thereof, wherein the multi-mode refrigerant direct-cooling type new energy automobile heat management unit comprises a compressor, the compressor is connected with a heating heat exchanger, the heating heat exchanger is connected with an automobile outer side heat exchanger through a second four-way reversing valve and a first four-way reversing valve, and the automobile outer side heat exchanger is respectively connected with a first one-way valve and a first electronic expansion valve; the first one-way valve and the first electronic expansion valve are converged and then connected with the second electronic expansion valve, the second electronic expansion valve is connected with the inner cooling core body, the inner cooling core body is connected with the second four-way reversing valve, the second four-way reversing valve is connected with the battery cold plate, the battery cold plate is connected with the third one-way valve and the third electronic expansion valve, and the third one-way valve and the third electronic expansion valve are converged and then connected with the second electronic expansion valve. The control method provides ten working modes of the heat management unit according to different requirements; the refrigerant heating function of the power battery is realized, and the heating energy consumption of the battery is reduced; meanwhile, the waste heat of the battery is recovered, and the cruising ability of the vehicle is enhanced.

Description

Multi-mode refrigerant direct cooling type new energy automobile heat management unit and control method thereof
Technical Field
The invention belongs to the field of new energy automobiles, and particularly relates to a multi-mode refrigerant direct cooling type new energy automobile heat management unit and a control method thereof.
Background
As the core of new energy automobiles, power batteries are limited by internal chemical principles, and the capacity, the service life, the charge and discharge performance and the safety are strongly influenced by the working temperature of the batteries. Under the high-temperature working condition, the battery not only allows the charge and discharge current to be reduced, but also greatly attenuates the capacity and the service life of the battery, and even can cause the battery to spontaneously combust under the severe condition. Under the low-temperature working condition, the allowable charging and discharging current of the battery is seriously reduced, even normal charging and discharging can not be carried out, otherwise, the risk of lithium precipitation can be generated, and the capacity and the service life of the battery are seriously attenuated.
When the temperature of the power battery is low, the battery needs to be heated. When the temperature of the power battery is higher, the battery needs to be cooled, and most of the power batteries of new energy automobiles adopt two modes of natural cooling and liquid cooling of cooling liquid at present. The natural cooling mode has low cost and simple structure, but has poor cooling effect, and is suitable for vehicles with small heating value, mild environment and low requirement on the service life of the battery. The liquid cooling mode of the cooling liquid is to drive the cooling liquid to flow through the battery cooling plate to exchange heat with the battery, the structure is relatively complex, the cost is high, the cooling effect is good, and the battery cooling requirement of the conventional new energy automobile can be basically met at present. However, with the increasing capacity of the power battery of the automobile, the popularization of the super rapid charging technology has become a necessary development trend, which brings about a drastic increase of the heat generation rate of the battery and brings about greater challenges to the stability and reliability of the battery thermal management system. On the other hand, when the temperature of the power battery is low, the battery needs to be heated, and at present, a heating film or a cooling liquid heating mode is usually adopted for external application on the surface of the battery, wherein the electric heating film heating mode has low cost, high heating rate and low energy consumption, but has high maintenance cost, and has the safety risk of spontaneous combustion due to falling of the heating film, and the electric heating film heating mode is gradually eliminated at present. The cooling liquid heating mode is a mode of heating the cooling liquid through a heater and then driving the cooling liquid to heat the battery, and has the advantages of high safety, good temperature uniformity, complex structure, high cost and high heating energy consumption.
The direct cooling technology of the power battery coolant, which directly introduces cooling liquid into a battery cold plate and utilizes the boiling/condensing process of a refrigerant to directly cool/heat the battery, has the advantages of good heat balance, large heat exchange power, high thermal safety and the like in the cooling/heating process, can effectively reduce the complexity and the cost of a battery thermal management system, is one of the main development routes of the automobile power battery thermal management unit at present, and has been applied to some automobile models such as BMI 3, Benz S400 and the like. However, the existing refrigerant direct cooling type heat management unit is formed by replacing the original liquid cooling heat exchanger with a refrigerant direct cooling battery cold plate on the basis of the original liquid cooling unit, the basic structure of the existing refrigerant direct cooling type heat management unit follows the structure of the original liquid cooling unit, and certain inherent defects exist and are not overcome. The existing refrigerant direct cooling type heat management unit can realize the refrigerant direct cooling function of the battery under the refrigeration condition of a passenger cabin, but does not have the direct heating function of the battery refrigerant, and the battery needs to be additionally provided with an electric heating film or a liquid heating system, so that the structure is complex and the cost is high. And the battery refrigeration can not be realized under the heating mode of the passenger compartment, the battery waste heat recovery can not be carried out, and the energy utilization rate of the whole vehicle is low. In addition, the existing refrigerant direct cooling type heat management unit usually adopts a plurality of electromagnetic valves to switch the refrigerant flow paths, which may cause the increase of system complexity and cost, and is not beneficial to the application and popularization of the refrigerant direct cooling technology.
Disclosure of Invention
The invention aims to provide a multi-mode refrigerant direct-cooling type new energy automobile heat management unit capable of realizing the functions of directly cooling and heating a power battery by a refrigerant, realizing the recovery of waste heat of the battery and enhancing the cruising ability of a vehicle, and a control method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
the multi-mode refrigerant direct cooling type new energy automobile heat management unit comprises a compressor, wherein the outlet of the compressor is connected with a refrigerant side inlet of a heating heat exchanger, the refrigerant side outlet of the heating heat exchanger is connected with a first interface of a second four-way reversing valve, a second interface of the second four-way reversing valve is connected with a fourth interface of a first four-way reversing valve, the second interface of the first four-way reversing valve is connected with one end of an automobile outer side heat exchanger, and the other end of the automobile outer side heat exchanger is respectively connected with a first one-way valve inlet and a first electronic expansion valve outlet;
an outlet of the first one-way valve and an inlet of the first electronic expansion valve are converged and then connected with an inlet of a second electronic expansion valve, an outlet of the second electronic expansion valve is connected with an inlet of an internal cooling core body, an internal fan is installed on one side of the internal cooling core body, an outlet of the internal cooling core body is connected with a fourth interface of a second four-way reversing valve, a third interface of the second four-way reversing valve is connected with one end of a battery cold plate, the other end of the battery cold plate is connected with an inlet of the third one-way valve and an outlet of the third electronic expansion valve, and an outlet of the third one-way valve and an inlet of the third electronic expansion valve are converged and then connected with an inlet of the second electronic expansion valve;
the fourth interface of the second four-way reversing valve is connected with the first inlet of the gas-liquid separator, the outlet of the gas-liquid separator is connected with the inlet of the compressor, the second inlet of the gas-liquid separator is connected with the first interface of the first four-way reversing valve, the third interface of the first four-way reversing valve is connected with the inlet of the second one-way valve, and the outlet of the second one-way valve is connected with the inlet of the second electronic expansion valve after being converged with the outlet of the first one-way valve, the inlet of the first electronic expansion valve, the inlet of the third electronic expansion valve and the outlet of the third one-way valve.
Furthermore, the multi-mode refrigerant direct cooling type new energy automobile heat management unit further comprises a cooling liquid circulation loop, the cooling liquid circulation loop is formed by connecting a heating heat exchanger, a water pump, an electric heater and an in-vehicle heating core body, an outlet of a cooling liquid side of the heating heat exchanger is connected with an inlet of the water pump, an outlet of the water pump is connected with an inlet of the electric heater, an outlet of the electric heater is connected with an inlet of the in-vehicle heating core body, and an outlet of the in-vehicle heating core body is connected with an inlet of the cooling liquid side of the heating heat exchanger.
The control method of the heat management unit comprises the steps of switching working modes by adjusting a first four-way reversing valve, a second four-way reversing valve, a first electronic expansion valve, a second electronic expansion valve and a third electronic expansion valve, wherein the working modes comprise a single passenger compartment refrigerating mode, a single cell refrigerating mode, a passenger compartment refrigerating + battery refrigerating mode, a single passenger compartment heating mode, a single cell heating mode, a passenger compartment heating + battery refrigerating mode, a single passenger compartment dehumidifying mode, a passenger compartment dehumidifying + battery refrigerating mode and a passenger compartment dehumidifying + battery heating mode, the first four-way reversing valve and the second four-way reversing valve comprise two modes of a reversing valve mode A and a reversing valve mode B, wherein the reversing valve mode A is that a first interface of the four-way reversing valve is communicated with the interior of a second interface, and a third interface of the four-way reversing valve is communicated with the interior of a fourth interface, the reversing valve mode B is that the first interface of the four-way reversing valve is communicated with the inside of the third interface, and the second interface of the four-way reversing valve is communicated with the inside of the fourth interface;
(1) single passenger cabin refrigeration mode: when only the air-conditioning refrigeration function of the passenger cabin is started and the battery management system does not request the battery for refrigeration or heating, the system starts the refrigeration mode of the single passenger cabin, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode B, a fan of a heat exchanger on the outer side of a vehicle is started, a first electronic expansion valve is closed, a second electronic expansion valve is opened and the opening degree is adjusted according to working conditions, the fan in the vehicle is started, the second four-way reversing valve is switched to a reversing valve mode A, a water pump is closed, an electric heater is closed, and a third electronic expansion valve is closed;
(2) cell cooling mode: when the air-conditioning refrigeration, heating and dehumidification functions of the passenger compartment are not started, and the battery management system requests the battery to refrigerate, the system starts a monocell refrigeration mode, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode B, a fan of a heat exchanger on the outer side of a vehicle is started, a first electronic expansion valve is closed, a second electronic expansion valve is closed, a fan in the vehicle is closed, the second four-way reversing valve is switched to a reversing valve mode A, a water pump is closed, an electric heater is closed, and a third electronic expansion valve is opened and the opening degree is adjusted according to working conditions;
(3) passenger compartment refrigeration + battery refrigeration mode: when the air-conditioning refrigeration function of the passenger compartment is started and the battery management system requests the battery for refrigeration, the system starts a passenger compartment refrigeration + battery refrigeration mode, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode B, a fan of a heat exchanger on the outer side of a vehicle is started, a first electronic expansion valve is closed, a second electronic expansion valve is opened and the opening degree is adjusted according to working conditions, the fan in the vehicle is started, the second four-way reversing valve is switched to a reversing valve mode A, a water pump is closed, an electric heater is closed, and a third electronic expansion valve is opened and the opening degree is adjusted according to the working conditions;
(4) single passenger compartment heating mode: when only the air-conditioning heating function of the passenger cabin is started and the battery management system does not request the battery for cooling or heating, the system starts the heating mode of the single passenger cabin, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode A, a fan of a heat exchanger on the outer side of the vehicle is started, a first electronic expansion valve is started and the opening degree is adjusted according to working conditions, a second electronic expansion valve is closed, the fan in the vehicle is started, the second four-way reversing valve is switched to the reversing valve mode A, a water pump is started, a third electronic expansion valve is closed, and if the heating capacity of a heating heat exchanger is insufficient, an electric heater can be started according to requirements;
(5) single cell heating mode: when only the refrigerating, heating and dehumidifying functions of the passenger compartment air conditioner are not started, and the battery management system requests the battery to heat, the system starts a single battery heating mode, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode A, a fan of a heat exchanger on the outer side of the vehicle is started, a first electronic expansion valve is started and the opening degree is adjusted according to working conditions, a second electronic expansion valve is closed, the fan in the vehicle is closed, the second four-way reversing valve is switched to a reversing valve mode B, a water pump is closed, an electric heater is closed, and a third electronic expansion valve is closed;
(6) heating of passenger compartment and heating of battery: when the air-conditioning heating function of the passenger compartment is started and the battery management system requests the battery to heat, the system starts the heating mode of the passenger compartment and the heating mode of the battery, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode A, a fan of a heat exchanger on the outer side of the vehicle is started, a first electronic expansion valve is started and the opening degree is adjusted according to working conditions, a second electronic expansion valve is closed, the fan in the vehicle is started, the second four-way reversing valve is switched to a reversing valve mode B, a water pump is started, a third electronic expansion valve is closed, and if the heating capacity of a heating heat exchanger is insufficient, an electric heater can be started according to requirements;
(7) heating of passenger compartment and battery cooling mode: when the air-conditioning heating function of the passenger compartment is started and the battery management system requests the battery to refrigerate, the system starts the heating and battery refrigerating mode of the passenger compartment, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode A, a fan of a heat exchanger on the outer side of the vehicle is closed, a first electronic expansion valve is closed, a second electronic expansion valve is closed, a fan in the vehicle is opened, a second four-way reversing valve is switched to the reversing valve mode A, a water pump is started, a third electronic expansion valve is opened, the opening degree is adjusted according to working conditions, and if the heating capacity of a heating heat exchanger is insufficient, an electric heater can be started according to requirements;
(8) single passenger cabin dehumidification mode: when only the dehumidification function of the passenger cabin is started and the battery management system does not request the battery to refrigerate or heat, the system starts the dehumidification mode of the single passenger cabin, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode A, a fan of a heat exchanger on the outer side of a vehicle is closed, a first electronic expansion valve is closed, a second electronic expansion valve is opened and the opening degree is adjusted according to working conditions, the fan in the vehicle is started, the second four-way reversing valve is switched to the reversing valve mode A, a water pump is started, an electric heater is closed, and a third electronic expansion valve is closed;
(9) passenger compartment dehumidification + battery cooling mode: when only the dehumidification function of the passenger compartment is started and the battery management system requests the battery to refrigerate, the system starts the dehumidification + battery refrigeration mode of the passenger compartment, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode B, a fan of a heat exchanger on the outer side of a vehicle is started, a first electronic expansion valve is closed, a second electronic expansion valve is opened and the opening degree is adjusted according to working conditions, the fan in the vehicle is started, the second four-way reversing valve is switched to a reversing valve mode A, a water pump is started, an electric heater is closed, and a third electronic expansion valve is opened and the opening degree is adjusted according to the working conditions;
(10) passenger compartment dehumidification + battery heating mode: when only the dehumidification function of the passenger compartment is started and the battery management system requests the battery to heat, the system starts the dehumidification + battery heating mode of the passenger compartment, and the working parameters are controlled as follows: the compressor is started, the first four-way reversing valve is switched to the reversing valve mode A, the fan of the heat exchanger on the outer side of the vehicle is started, the first electronic expansion valve is started and the opening degree is adjusted according to the working condition, the second electronic expansion valve is started and the opening degree is adjusted according to the working condition, the fan in the vehicle is started, the second four-way reversing valve is switched to the reversing valve mode B, the water pump is started, the third electronic expansion valve is closed, and if the heating capacity of the heating heat exchanger is insufficient, the electric heater can be started according to requirements.
Therefore, compared with the prior art, the invention has the following technical effects:
1) the multi-mode refrigerant direct-cooling type new energy automobile heat management unit provided by the invention realizes the refrigerant heating function of the power battery, reduces the structural complexity and cost of the power battery heat management system, and reduces the heating energy consumption of the battery.
2) The invention can realize battery refrigeration in the heat pump heating mode of the passenger compartment, meet the battery refrigeration requirement under the working condition of lower temperature, simultaneously improve the energy utilization rate of the whole vehicle and enhance the cruising ability of the vehicle.
3) The invention selects two four-way reversing valves to control the switching of the refrigerant flow paths, and has low cost, high stability and reliability compared with the conventional scheme of a plurality of electromagnetic valves.
4) The invention provides ten working modes of the heat management unit according to different requirements: the system comprises a single passenger compartment refrigeration mode, a single battery refrigeration mode, a passenger compartment refrigeration + battery refrigeration mode, a single passenger compartment heating mode, a single battery heating mode, a passenger compartment heating + battery refrigeration mode, a single passenger compartment dehumidification mode, a passenger compartment dehumidification + battery refrigeration mode and a passenger compartment dehumidification + battery heating mode, wherein the switching of the working modes is completed by adjusting a first four-way reversing valve, a second four-way reversing valve, a first electronic expansion valve, a second electronic expansion valve and a third electronic expansion valve.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 101-a compressor; 102-a gas-liquid separator; 103-a first four-way reversing valve; 104-a vehicle outboard heat exchanger; 105-a first one-way valve; 106-a first electronic expansion valve; 107-a second one-way valve; 108-a second electronic expansion valve; 109-a fan in the vehicle; 110-an internal cooling core; 111-a warm core in a vehicle; 112-a second four-way reversing valve; 113-a heating heat exchanger; 114-a water pump; 115-an electric heater; 116-a third electronic expansion valve; 117-third one-way valve; 118-battery cold plate.
Detailed Description
The present invention is illustrated by the following examples, but the present invention is not limited to the following examples, and all the implementations that meet the gist described above and below are within the technical scope of the present invention.
The multi-mode refrigerant direct cooling type new energy automobile heat management unit comprises a compressor 101, wherein the outlet of the compressor 101 is connected with a refrigerant side inlet of a heating heat exchanger 113, the refrigerant side outlet of the heating heat exchanger 113 is connected with a first interface of a second four-way reversing valve 112, a second interface of the second four-way reversing valve 112 is connected with a fourth interface of a first four-way reversing valve 103, the second interface of the first four-way reversing valve 103 is connected with one end of an automobile outer side heat exchanger 104, and the other end of the automobile outer side heat exchanger 104 is respectively connected with an inlet of a first check valve 105 and an outlet of a first electronic expansion valve 106.
An outlet of the first one-way valve 105 and an inlet of the first electronic expansion valve 106 are converged and then connected with an inlet of the second electronic expansion valve 108, an outlet of the second electronic expansion valve 108 is connected with an inlet of the inner cooling core body 110, an inner fan 109 is installed on one side of the inner cooling core body 110, an outlet of the inner cooling core body 110 is connected with a fourth interface of the second four-way reversing valve 112, a third interface of the second four-way reversing valve 112 is connected with one end of a battery cold plate 118, the other end of the battery cold plate 118 is connected with an inlet of the third one-way valve 117 and an outlet of the third electronic expansion valve 116, and an outlet of the third one-way valve 117 and an inlet of the third electronic expansion valve 116 are converged and then connected with an inlet of the second electronic expansion valve 108.
The fourth interface of the second four-way reversing valve 112 is connected with the first inlet of the gas-liquid separator 102, the outlet of the gas-liquid separator 102 is connected with the inlet of the compressor 101, the third interface of the first four-way reversing valve 103 is connected with the first interface of the first four-way reversing valve 103, the third interface of the first four-way reversing valve 103 is connected with the inlet of the second one-way valve 107, and the outlet of the second one-way valve 107 is converged with the outlet of the first one-way valve 105, the inlet of the first electronic expansion valve 106, the inlet of the third electronic expansion valve 116 and the outlet of the third one-way valve 117 and then connected with the inlet of the second electronic expansion valve 108.
The multi-mode refrigerant direct cooling type new energy automobile heat management unit further comprises a coolant circulation loop, the coolant circulation loop is formed by connecting a heating heat exchanger 113, a water pump 114, an electric heater 115 and an in-vehicle heating core body 111, an outlet of a coolant side of the heating heat exchanger 113 is connected with an inlet of the water pump 114, an outlet of the water pump 114 is connected with an inlet of the electric heater 115, an outlet of the electric heater 115 is connected with an inlet of the in-vehicle heating core body 111, and an outlet of the in-vehicle heating core body 111 is connected with an inlet of the coolant side of the heating heat exchanger 113.
The control method of the heat management unit switches working modes by adjusting the first four-way reversing valve 103, the second four-way reversing valve 112, the first electronic expansion valve 106, the second electronic expansion valve 108 and the third electronic expansion valve 116, wherein the working modes comprise a single-passenger cabin cooling mode, a single-cell cooling mode, a passenger cabin cooling + battery cooling mode, a single-passenger cabin heating mode, a single-cell heating mode, a passenger cabin heating + battery cooling mode, a single-passenger cabin dehumidification mode, a passenger cabin dehumidification + battery cooling mode and a passenger cabin dehumidification + battery heating mode. The first four-way reversing valve 103 and the second four-way reversing valve 112 include a reversing valve mode a and a reversing valve mode B, wherein the reversing valve mode a is that the first interface and the second interface of the four-way reversing valve are internally communicated, the third interface and the fourth interface are internally communicated, and the reversing valve mode B is that the first interface and the third interface of the four-way reversing valve are internally communicated, and the second interface and the fourth interface are internally communicated.
(1) Single passenger cabin refrigeration mode: when only the air-conditioning refrigeration function of the passenger cabin is started and the battery management system does not request the battery for refrigeration or heating, the system starts the refrigeration mode of the single passenger cabin, and the working parameters are controlled as follows: the compressor 101 is started, the first four-way reversing valve 103 is switched to the reversing valve mode B, the fan of the heat exchanger 104 on the outer side of the vehicle is started, the first electronic expansion valve 106 is closed, the second electronic expansion valve 108 is started and the opening degree is adjusted according to the working condition, the fan 109 in the vehicle is started, the second four-way reversing valve 112 is switched to the reversing valve mode A, the water pump 114 is closed, the electric heater 115 is closed, and the third electronic expansion valve 116 is closed.
(2) Cell cooling mode: when the air-conditioning refrigeration, heating and dehumidification functions of the passenger compartment are not started, and the battery management system requests the battery to refrigerate, the system starts a monocell refrigeration mode, and the working parameters are controlled as follows: the compressor 101 is started, the first four-way reversing valve 103 is switched to the reversing valve mode B, the fan of the heat exchanger 104 on the outer side of the vehicle is started, the first electronic expansion valve 106 is closed, the second electronic expansion valve 108 is closed, the fan 109 in the vehicle is closed, the second four-way reversing valve 112 is switched to the reversing valve mode A, the water pump 114 is closed, the electric heater 115 is closed, the third electronic expansion valve 116 is started, and the opening degree is adjusted according to the working condition.
(3) Passenger compartment refrigeration + battery refrigeration mode: when the air-conditioning refrigeration function of the passenger compartment is started and the battery management system requests the battery for refrigeration, the system starts a passenger compartment refrigeration + battery refrigeration mode, and the working parameters are controlled as follows: the compressor 101 is started, the first four-way reversing valve 103 is switched to the reversing valve mode B, the fan of the heat exchanger 104 on the outer side of the vehicle is started, the first electronic expansion valve 106 is closed, the second electronic expansion valve 108 is started and the opening degree is adjusted according to the working condition, the fan 109 in the vehicle is started, the second four-way reversing valve 112 is switched to the reversing valve mode A, the water pump 114 is closed, the electric heater 115 is closed, and the third electronic expansion valve 116 is started and the opening degree is adjusted according to the working condition.
(4) Single passenger compartment heating mode: when only the air-conditioning heating function of the passenger cabin is started and the battery management system does not request the battery for cooling or heating, the system starts the heating mode of the single passenger cabin, and the working parameters are controlled as follows: the compressor 101 is started, the first four-way reversing valve 103 is switched to the reversing valve mode A, the fan of the heat exchanger 104 on the outer side of the vehicle is started, the first electronic expansion valve 106 is started and the opening degree is adjusted according to the working condition, the second electronic expansion valve 108 is closed, the fan 109 in the vehicle is started, the second four-way reversing valve 112 is switched to the reversing valve mode A, the water pump 114 is started, the third electronic expansion valve 116 is closed, and if the heating quantity of the heating heat exchanger is insufficient, the electric heater 115 can be started according to the requirement.
(5) Single cell heating mode: when only the refrigerating, heating and dehumidifying functions of the passenger compartment air conditioner are not started, and the battery management system requests the battery to heat, the system starts a single battery heating mode, and the working parameters are controlled as follows: the compressor 101 is started, the first four-way reversing valve 103 is switched to the reversing valve mode A, the fan of the heat exchanger 104 on the outer side of the vehicle is started, the first electronic expansion valve 106 is started and the opening degree is adjusted according to the working condition, the second electronic expansion valve 108 is closed, the fan 109 in the vehicle is closed, the second four-way reversing valve 112 is switched to the reversing valve mode B, the water pump 114 is closed, the electric heater 115 is closed, and the third electronic expansion valve 116 is closed.
(6) Heating of passenger compartment and heating of battery: when the air-conditioning heating function of the passenger compartment is started and the battery management system requests the battery to heat, the system starts the heating mode of the passenger compartment and the heating mode of the battery, and the working parameters are controlled as follows: the compressor 101 is started, the first four-way reversing valve 103 is switched to the reversing valve mode A, the fan of the heat exchanger 104 on the outer side of the vehicle is started, the first electronic expansion valve 106 is started and the opening degree is adjusted according to the working condition, the second electronic expansion valve 108 is closed, the fan 109 in the vehicle is started, the second four-way reversing valve 112 is switched to the reversing valve mode B, the water pump 114 is started, the third electronic expansion valve 116 is closed, and if the heating quantity of the heating heat exchanger is insufficient, the electric heater 115 can be started according to the requirement.
(7) Heating of passenger compartment and battery cooling mode: when the air-conditioning heating function of the passenger compartment is started and the battery management system requests the battery to refrigerate, the system starts the heating and battery refrigerating mode of the passenger compartment, and the working parameters are controlled as follows: the compressor 101 is started, the first four-way reversing valve 103 is switched to the reversing valve mode A, the fan of the heat exchanger 104 on the outer side of the vehicle is closed, the first electronic expansion valve 106 is closed, the second electronic expansion valve 108 is closed, the fan 109 in the vehicle is opened, the second four-way reversing valve 112 is switched to the reversing valve mode A, the water pump 114 is opened, the third electronic expansion valve 116 is opened, the opening degree is adjusted according to the working condition, and if the heating heat of the heating heat exchanger is insufficient, the electric heater 115 can be started according to the requirement.
(8) Single passenger cabin dehumidification mode: when only the dehumidification function of the passenger cabin is started and the battery management system does not request the battery to refrigerate or heat, the system starts the dehumidification mode of the single passenger cabin, and the working parameters are controlled as follows: the compressor 101 is started, the first four-way reversing valve 103 is switched to the reversing valve mode A, the fan of the heat exchanger 104 on the outer side of the vehicle is closed, the first electronic expansion valve 106 is closed, the second electronic expansion valve 108 is opened, the opening degree is adjusted according to the working condition, the fan 109 in the vehicle is opened, the second four-way reversing valve 112 is switched to the reversing valve mode A, the water pump 114 is opened, the electric heater 115 is closed, and the third electronic expansion valve 116 is closed.
(9) Passenger compartment dehumidification + battery cooling mode: when only the dehumidification function of the passenger compartment is started and the battery management system requests the battery to refrigerate, the system starts the dehumidification + battery refrigeration mode of the passenger compartment, and the working parameters are controlled as follows: the compressor 101 is started, the first four-way reversing valve 103 is switched to the reversing valve mode B, the fan of the heat exchanger 104 on the outer side of the vehicle is started, the first electronic expansion valve 106 is closed, the second electronic expansion valve 108 is started and the opening degree is adjusted according to the working condition, the fan 109 in the vehicle is started, the second four-way reversing valve 112 is switched to the reversing valve mode A, the water pump 114 is started, the electric heater 115 is closed, and the third electronic expansion valve 116 is started and the opening degree is adjusted according to the working condition.
(10) Passenger compartment dehumidification + battery heating mode: when only the dehumidification function of the passenger compartment is started and the battery management system requests the battery to heat, the system starts the dehumidification + battery heating mode of the passenger compartment, and the working parameters are controlled as follows: the compressor 101 is started, the first four-way reversing valve 103 is switched to the reversing valve mode A, the fan of the heat exchanger 104 on the outer side of the vehicle is started, the first electronic expansion valve 106 is started and the opening degree is adjusted according to the working condition, the second electronic expansion valve 108 is started and the opening degree is adjusted according to the working condition, the fan 109 in the vehicle is started, the second four-way reversing valve 112 is switched to the reversing valve mode B, the water pump 114 is started, the third electronic expansion valve 116 is closed, and if the heating capacity of the heating heat exchanger is insufficient, the electric heater 115 can be started according to requirements.

Claims (2)

1. The multi-mode refrigerant direct cooling type new energy automobile heat management unit is characterized by comprising a compressor, wherein the outlet of the compressor is connected with a refrigerant side inlet of a heating heat exchanger, the refrigerant side outlet of the heating heat exchanger is connected with a first interface of a second four-way reversing valve, a second interface of the second four-way reversing valve is connected with a fourth interface of a first four-way reversing valve, the second interface of the first four-way reversing valve is connected with one end of an automobile outer side heat exchanger, and the other end of the automobile outer side heat exchanger is respectively connected with a first one-way valve inlet and a first electronic expansion valve outlet;
an outlet of the first one-way valve and an inlet of the first electronic expansion valve are converged and then connected with an inlet of a second electronic expansion valve, an outlet of the second electronic expansion valve is connected with an inlet of an internal cooling core body, an internal fan is installed on one side of the internal cooling core body, an outlet of the internal cooling core body is connected with a fourth interface of a second four-way reversing valve, a third interface of the second four-way reversing valve is connected with one end of a battery cold plate, the other end of the battery cold plate is connected with an inlet of the third one-way valve and an outlet of the third electronic expansion valve, and an outlet of the third one-way valve and an inlet of the third electronic expansion valve are converged and then connected with an inlet of the second electronic expansion valve;
the fourth interface of the second four-way reversing valve is connected with the first inlet of the gas-liquid separator, the outlet of the gas-liquid separator is connected with the inlet of the compressor, the second inlet of the gas-liquid separator is connected with the first interface of the first four-way reversing valve, the third interface of the first four-way reversing valve is connected with the inlet of the second one-way valve, and the outlet of the second one-way valve is connected with the inlet of the second electronic expansion valve after being converged with the outlet of the first one-way valve, the inlet of the first electronic expansion valve, the inlet of the third electronic expansion valve and the outlet of the third one-way valve;
the multi-mode refrigerant direct-cooling type new energy automobile heat management unit further comprises a coolant circulation loop, wherein the coolant circulation loop is formed by connecting a heating heat exchanger, a water pump, an electric heater and an in-automobile heating core body, an outlet of a cooling liquid side of the heating heat exchanger is connected with an inlet of the water pump, an outlet of the water pump is connected with an inlet of the electric heater, an outlet of the electric heater is connected with an inlet of the in-automobile heating core body, and an outlet of the in-automobile heating core body is connected with an inlet of the cooling liquid side of the heating heat exchanger.
2. The control method of the thermal management unit according to claim 1, wherein the control method switches the operation modes by adjusting a first four-way reversing valve, a second four-way reversing valve, a first electronic expansion valve, a second electronic expansion valve, and a third electronic expansion valve, the operation modes include a single-passenger compartment cooling mode, a single-cell cooling mode, a passenger compartment cooling + battery cooling mode, a single-passenger compartment heating mode, a single-cell heating mode, a passenger compartment heating + battery cooling mode, a single-passenger compartment dehumidification mode, a passenger compartment dehumidification + battery cooling mode, and a passenger compartment dehumidification + battery heating mode, the first four-way reversing valve and the second four-way reversing valve include a reversing valve mode A and a reversing valve mode B, wherein the reversing valve mode A is a mode in which the first interface and the second interface of the four-way reversing valve are internally communicated, The third interface is communicated with the inside of the fourth interface, and the reversing valve mode B is that the first interface of the four-way reversing valve is communicated with the inside of the third interface, and the second interface is communicated with the inside of the fourth interface;
(1) single passenger cabin refrigeration mode: when only the air-conditioning refrigeration function of the passenger cabin is started and the battery management system does not request the battery for refrigeration or heating, the system starts the refrigeration mode of the single passenger cabin, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode B, a fan of a heat exchanger on the outer side of a vehicle is started, a first electronic expansion valve is closed, a second electronic expansion valve is opened and the opening degree is adjusted according to working conditions, the fan in the vehicle is started, the second four-way reversing valve is switched to a reversing valve mode A, a water pump is closed, an electric heater is closed, and a third electronic expansion valve is closed;
(2) cell cooling mode: when the air-conditioning refrigeration, heating and dehumidification functions of the passenger compartment are not started, and the battery management system requests the battery to refrigerate, the system starts a monocell refrigeration mode, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode B, a fan of a heat exchanger on the outer side of a vehicle is started, a first electronic expansion valve is closed, a second electronic expansion valve is closed, a fan in the vehicle is closed, the second four-way reversing valve is switched to a reversing valve mode A, a water pump is closed, an electric heater is closed, and a third electronic expansion valve is opened and the opening degree is adjusted according to working conditions;
(3) passenger compartment refrigeration + battery refrigeration mode: when the air-conditioning refrigeration function of the passenger compartment is started and the battery management system requests the battery for refrigeration, the system starts a passenger compartment refrigeration + battery refrigeration mode, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode B, a fan of a heat exchanger on the outer side of a vehicle is started, a first electronic expansion valve is closed, a second electronic expansion valve is opened and the opening degree is adjusted according to working conditions, the fan in the vehicle is started, the second four-way reversing valve is switched to a reversing valve mode A, a water pump is closed, an electric heater is closed, and a third electronic expansion valve is opened and the opening degree is adjusted according to the working conditions;
(4) single passenger compartment heating mode: when only the air-conditioning heating function of the passenger cabin is started and the battery management system does not request the battery for cooling or heating, the system starts the heating mode of the single passenger cabin, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode A, a fan of a heat exchanger on the outer side of the vehicle is started, a first electronic expansion valve is started and the opening degree is adjusted according to working conditions, a second electronic expansion valve is closed, the fan in the vehicle is started, the second four-way reversing valve is switched to the reversing valve mode A, a water pump is started, a third electronic expansion valve is closed, and if the heating capacity of a heating heat exchanger is insufficient, an electric heater can be started according to requirements;
(5) single cell heating mode: when only the refrigerating, heating and dehumidifying functions of the passenger compartment air conditioner are not started, and the battery management system requests the battery to heat, the system starts a single battery heating mode, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode A, a fan of a heat exchanger on the outer side of the vehicle is started, a first electronic expansion valve is started and the opening degree is adjusted according to working conditions, a second electronic expansion valve is closed, the fan in the vehicle is closed, the second four-way reversing valve is switched to a reversing valve mode B, a water pump is closed, and an electric heater is closed and a third electronic expansion valve is closed;
(6) heating of passenger compartment and heating of battery: when the air-conditioning heating function of the passenger compartment is started and the battery management system requests the battery to heat, the system starts the heating mode of the passenger compartment and the heating mode of the battery, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode A, a fan of a heat exchanger on the outer side of the vehicle is started, a first electronic expansion valve is started and the opening degree is adjusted according to working conditions, a second electronic expansion valve is closed, the fan in the vehicle is started, the second four-way reversing valve is switched to a reversing valve mode B, a water pump is started, a third electronic expansion valve is closed, and if the heating capacity of a heating heat exchanger is insufficient, an electric heater can be started according to requirements;
(7) heating of passenger compartment and battery cooling mode: when the air-conditioning heating function of the passenger compartment is started and the battery management system requests the battery to refrigerate, the system starts the heating and battery refrigerating mode of the passenger compartment, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode A, a fan of a heat exchanger on the outer side of the vehicle is closed, a first electronic expansion valve is closed, a second electronic expansion valve is closed, a fan in the vehicle is opened, a second four-way reversing valve is switched to the reversing valve mode A, a water pump is started, a third electronic expansion valve is opened, the opening degree is adjusted according to working conditions, and if the heating capacity of a heating heat exchanger is insufficient, an electric heater can be started according to requirements;
(8) single passenger cabin dehumidification mode: when only the dehumidification function of the passenger cabin is started and the battery management system does not request the battery to refrigerate or heat, the system starts the dehumidification mode of the single passenger cabin, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode A, a fan of a heat exchanger on the outer side of a vehicle is closed, a first electronic expansion valve is closed, a second electronic expansion valve is opened and the opening degree is adjusted according to working conditions, the fan in the vehicle is started, the second four-way reversing valve is switched to the reversing valve mode A, a water pump is started, an electric heater is closed, and a third electronic expansion valve is closed;
(9) passenger compartment dehumidification + battery cooling mode: when only the dehumidification function of the passenger compartment is started and the battery management system requests the battery to refrigerate, the system starts the dehumidification + battery refrigeration mode of the passenger compartment, and the working parameters are controlled as follows: the method comprises the following steps that a compressor is started, a first four-way reversing valve is switched to a reversing valve mode B, a fan of a heat exchanger on the outer side of a vehicle is started, a first electronic expansion valve is closed, a second electronic expansion valve is opened and the opening degree is adjusted according to working conditions, the fan in the vehicle is started, the second four-way reversing valve is switched to a reversing valve mode A, a water pump is started, an electric heater is closed, and a third electronic expansion valve is opened and the opening degree is adjusted according to the working conditions;
(10) passenger compartment dehumidification + battery heating mode: when only the dehumidification function of the passenger compartment is started and the battery management system requests the battery to heat, the system starts the dehumidification + battery heating mode of the passenger compartment, and the working parameters are controlled as follows: the compressor is started, the first four-way reversing valve is switched to the reversing valve mode A, the fan of the heat exchanger on the outer side of the vehicle is started, the first electronic expansion valve is started and the opening degree is adjusted according to the working condition, the second electronic expansion valve is started and the opening degree is adjusted according to the working condition, the fan in the vehicle is started, the second four-way reversing valve is switched to the reversing valve mode B, the water pump is started, the third electronic expansion valve is closed, and if the heating capacity of the heating heat exchanger is insufficient, the electric heater can be started according to requirements.
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