CN108001153B - Electric automobile thermal management system, control method and electric automobile - Google Patents
Electric automobile thermal management system, control method and electric automobile Download PDFInfo
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- CN108001153B CN108001153B CN201711172959.3A CN201711172959A CN108001153B CN 108001153 B CN108001153 B CN 108001153B CN 201711172959 A CN201711172959 A CN 201711172959A CN 108001153 B CN108001153 B CN 108001153B
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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
- B60H1/00007—Combined heating, ventilating, or cooling devices
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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
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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
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00899—Controlling the flow of liquid in a heat pump system
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- 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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses
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Abstract
The application provides a thermal management system and a control method of an electric automobile and the electric automobile, wherein the system comprises: the heat pump air-conditioning subsystem is used for providing cooling or heating service for the internal space of the carriage; a coolant circulation subsystem for providing cooling or heating services to at least some of the electronic components of the electric vehicle; and the intermediate heat exchanger is used for performing heat exchange when heat exchange is needed between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem. Through the scheme of the application, heat exchange can be carried out between the managed areas when needed, heat is efficiently and accurately distributed and utilized, the comprehensive utilization rate of energy is improved, and the effects of energy conservation and emission reduction are optimized.
Description
Technical Field
The application relates to the field of automobiles, in particular to a thermal management system and a control method of an electric automobile and the electric automobile.
Background
With the development of technology, electric vehicle (including vehicles powered by electricity in all) technology is receiving more and more attention. With regard to thermal management of electric vehicles, there has been a significant concern. The electric automobile has more spaces and parts which need to be subjected to heat management, the inner space of the carriage needs to be cooled or heated according to the requirements of users, the driving motor and the control module need to be cooled to prevent high-temperature operation damage, and the battery pack needs to be maintained at the optimal operation temperature to ensure the working efficiency and the service life of the battery pack.
At present, an electrically driven air conditioner is generally adopted to regulate the temperature of the inner space of a carriage, and a driving motor, a battery pack, a control module and the like dissipate heat in a cooling liquid or air cooling mode. The system device with the independent temperature regulation mode is complex, heat exchange cannot be carried out among all managed areas, heat cannot be efficiently and accurately distributed and utilized, the comprehensive utilization rate of energy is low, and the disadvantage is more obvious under the current major trend of energy conservation and emission reduction.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
In view of the above, the application provides a thermal management system and a control method for an electric vehicle, and the electric vehicle, wherein an intermediate heat exchanger is arranged between a heat pump air-conditioning subsystem and a cooling liquid circulation subsystem, so that heat exchange can be performed between each managed area when heat exchange is required, heat is efficiently and accurately distributed and utilized, and the comprehensive utilization rate of energy is improved.
According to an aspect of the present application, there is provided a thermal management system of an electric vehicle, including:
the heat pump air-conditioning subsystem is used for providing cooling or heating service for the internal space of the carriage;
a coolant circulation subsystem for providing cooling or heating services to at least some of the electronic components of the electric vehicle;
and the intermediate heat exchanger is used for performing heat exchange when heat exchange is needed between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem.
Further, the intermediate heat exchanger exchanges heat between the heat pump air-conditioning subsystem and the coolant circulation subsystem when the coolant circulation subsystem performs cooling circulation and the heat pump air-conditioning subsystem performs refrigeration circulation, or when the coolant circulation subsystem performs heating circulation and the heat pump air-conditioning subsystem performs heating circulation;
and/or the presence of a gas in the gas,
the first heat exchange pipeline of the intermediate heat exchanger is connected with at least part of refrigerant pipelines of the indoor heat exchanger in the heat pump air-conditioning subsystem in parallel, so that the refrigerant flowing to the indoor heat exchanger can partially flow into the intermediate heat exchanger;
and/or the presence of a gas in the gas,
the cooling liquid circulation subsystem comprises a water pump, a cooling liquid heating unit and a cooling liquid cooling unit,
and the second heat exchange pipeline of the intermediate heat exchanger is arranged in a cooling liquid pipeline of the cooling liquid circulation subsystem, which is at least composed of the water pump, the cooling liquid heating unit and the cooling liquid cooling unit, and is used for flowing through cooling liquid.
The heat pump air-conditioning subsystem further comprises a first valve unit, the first heat exchange pipeline of the intermediate heat exchanger is connected into the heat pump air-conditioning subsystem through the first valve unit, and the refrigerant in the heat pump air-conditioning subsystem is controlled to be switched on or off to flow into the first heat exchange pipeline of the intermediate heat exchanger through the first valve unit;
and/or the presence of a gas in the gas,
controlling the cooling liquid cooling unit not to provide cooling service and the cooling liquid heating unit to provide heating service when it is determined that the cooling liquid circulation subsystem needs to operate a heating cycle, and/or,
and when the cooling liquid circulation subsystem needs to operate the cooling circulation, controlling the cooling liquid cooling unit to provide cooling service and controlling the cooling liquid heating unit not to provide a heating server.
Further, a fourth valve unit is included, and a cooling liquid pipeline of the cooling liquid cooling unit is selectively communicated to the cooling liquid circulation pipeline of the cooling liquid circulation subsystem through the fourth valve unit so as to provide or not provide the cooling service;
and/or the presence of a gas in the gas,
the cooling liquid heating unit can be controlled to be switched on or switched off to provide or not provide the heating service;
and/or the presence of a gas in the gas,
the coolant circulation subsystem further comprises a second valve unit and/or a third valve unit,
the second valve unit is arranged in a cooling liquid pipeline between the battery pack heat exchanger and the water pump in the cooling liquid circulation subsystem;
the third valve unit is arranged in a cooling liquid pipeline between the other electronic component heat exchangers in the cooling liquid circulation subsystem and the water pump;
selectively flowing the cooling fluid through the battery pack heat exchanger and/or the other electronic component heat exchanger to cool or heat a battery pack and/or other electronic component by control of the second and/or third valve units.
Further, when the cooling circulation subsystem performs the cooling circulation, it is determined whether the temperature of the battery pack is lower than a first preset value, if so, the second valve unit is controlled to close to stop cooling the battery pack, and/or,
when the cooling liquid circulation subsystem executes heating circulation, judging whether the temperature of the battery pack is greater than a second preset value, if so, controlling the second valve unit to close to stop cooling the battery pack;
and/or the presence of a gas in the gas,
the fourth valve unit is a three-way valve,
a first valve port of the three-way valve is communicated with an input end of a cooling liquid pipeline of the cooling liquid cooling unit, a second valve port of the three-way valve is communicated with an output end of the cooling liquid pipeline of the cooling liquid cooling unit, the second valve port and the output end of the cooling liquid pipeline of the cooling liquid cooling unit are communicated with the water pump, a third valve port of the three-way valve is communicated with the second valve unit and/or the third valve unit,
wherein the content of the first and second substances,
when the cooling liquid circulation subsystem needs to run cooling circulation, the first valve port and the third valve port of the three-way valve are controlled to be communicated,
and/or when the cooling liquid circulation subsystem needs to operate heating circulation, the second valve port and the third valve port of the three-way valve are controlled to be communicated;
and/or the presence of a gas in the gas,
the cooling liquid heating unit is a PTC electric heater;
and/or the presence of a gas in the gas,
the cooling liquid cooling unit is an outdoor heat exchanger;
and/or the presence of a gas in the gas,
at least one of the first valve unit, the second valve unit, the third valve unit, and the fourth valve unit includes: at least one of an electromagnetic valve, an electric valve, a manual valve and a mechanical switch.
Further, the heat management system further comprises a control unit, and the control unit executes the control on the first valve unit, the second valve unit, the third valve unit, the fourth valve unit, the coolant heating unit, and at least one of the valve unit, the throttle unit, the indoor fan and the outdoor fan in the heat pump air-conditioning subsystem to realize the heat management among the heat pump air-conditioning subsystem, the coolant circulation subsystem and the intermediate heat exchanger.
According to another aspect of the present application, there is also provided a control method of a thermal management system of an electric vehicle, wherein the thermal management system includes a heat pump air conditioning subsystem for providing a cooling or heating service to a vehicle cabin interior space, a coolant circulation subsystem for providing a cooling or heating service to at least a part of electronic components of the electric vehicle, and an intermediate heat exchanger for providing a heat exchange service between the heat pump air conditioning subsystem and the coolant circulation subsystem, the method including:
and when heat exchange is needed between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem, controlling to enable the intermediate heat exchanger to carry out heat exchange.
Further, the intermediate heat exchanger exchanges heat between the heat pump air-conditioning subsystem and the coolant circulation subsystem when the coolant circulation subsystem performs cooling circulation and the heat pump air-conditioning subsystem performs refrigeration circulation, or when the coolant circulation subsystem performs heating circulation and the heat pump air-conditioning subsystem performs heating circulation;
and/or the presence of a gas in the gas,
the first heat exchange pipeline of the intermediate heat exchanger is connected with at least part of refrigerant pipelines of the indoor heat exchanger in the heat pump air-conditioning subsystem in parallel, so that the refrigerant flowing to the indoor heat exchanger can partially flow into the intermediate heat exchanger;
and/or the presence of a gas in the gas,
the cooling liquid circulation subsystem comprises a water pump, a cooling liquid heating unit and a cooling liquid cooling unit,
and the second heat exchange pipeline of the intermediate heat exchanger is arranged in a cooling liquid pipeline of the cooling liquid circulation subsystem, which is at least composed of the water pump, the cooling liquid heating unit and the cooling liquid cooling unit, and is used for flowing through cooling liquid.
The heat pump air-conditioning subsystem further comprises a first valve unit, the first heat exchange pipeline of the intermediate heat exchanger is connected into the heat pump air-conditioning subsystem through the first valve unit, and the refrigerant in the heat pump air-conditioning subsystem is controlled to be switched on or off to flow into the first heat exchange pipeline of the intermediate heat exchanger through the first valve unit;
and/or the presence of a gas in the gas,
controlling the cooling liquid cooling unit not to provide cooling service and the cooling liquid heating unit to provide heating service when it is determined that the cooling liquid circulation subsystem needs to operate a heating cycle, and/or,
and when the cooling liquid circulation subsystem needs to operate the cooling circulation, controlling the cooling liquid cooling unit to provide cooling service and controlling the cooling liquid heating unit not to provide heating service.
Further, the cooling liquid circulation subsystem further comprises a fourth valve unit, and the fourth valve unit is controlled to enable a cooling liquid pipeline of the cooling liquid cooling unit to be selectively conducted to the cooling liquid circulation pipeline of the cooling liquid circulation subsystem through the fourth valve unit so as to provide or not provide the cooling service;
and/or the presence of a gas in the gas,
controlling the coolant heating unit to be turned on or off to provide or not provide the heating service;
and/or the presence of a gas in the gas,
the coolant circulation subsystem further comprises a second valve unit and/or a third valve unit,
the second valve unit is arranged in a cooling liquid pipeline between the battery pack heat exchanger and the water pump in the cooling liquid circulation subsystem;
the third valve unit is arranged in a cooling liquid pipeline between the other electronic component heat exchangers in the cooling liquid circulation subsystem and the water pump;
selectively flowing the cooling fluid through the battery pack heat exchanger and/or the other electronic component heat exchanger to cool or heat a battery pack and/or other electronic component by control of the second and/or third valve units.
Further, when the cooling circulation subsystem performs the cooling circulation, it is determined whether the temperature of the battery pack is lower than a first preset value, if so, the second valve unit is controlled to close to stop cooling the battery pack, and/or,
when the cooling liquid circulation subsystem executes heating circulation, judging whether the temperature of the battery pack is greater than a second preset value, if so, controlling the second valve unit to close to stop cooling the battery pack;
and/or the presence of a gas in the gas,
the fourth valve unit is a three-way valve,
a first valve port of the three-way valve is communicated with an input end of a cooling liquid pipeline of the cooling liquid cooling unit, a second valve port of the three-way valve is communicated with an output end of the cooling liquid pipeline of the cooling liquid cooling unit, the second valve port and the output end of the cooling liquid pipeline of the cooling liquid cooling unit are communicated with the water pump, a third valve port of the three-way valve is communicated with the second valve unit and/or the third valve unit,
wherein the content of the first and second substances,
when the cooling liquid circulation subsystem needs to run cooling circulation, the first valve port and the third valve port of the three-way valve are controlled to be conducted,
and/or controlling the conduction of the second valve port and the third valve port of the three-way valve when the cooling liquid circulation subsystem needs to operate heating circulation;
and/or the presence of a gas in the gas,
the cooling liquid heating unit is a PTC electric heating unit;
and/or the presence of a gas in the gas,
the cooling liquid cooling unit is an outdoor heat exchanger;
and/or the presence of a gas in the gas,
at least one of the first valve unit, the second valve unit, the third valve unit, and the fourth valve unit includes: at least one of an electromagnetic valve, an electric valve, a manual valve and a mechanical switch.
According to yet another aspect of the present application, there is also provided an electric vehicle comprising a thermal management system as described above.
According to the electric automobile heat management system, the control method and the electric automobile, the intermediate heat exchanger is arranged between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem, so that heat exchange can be carried out between all managed areas when heat exchange is needed, heat is efficiently and accurately distributed and utilized, the comprehensive utilization rate of energy is improved, and the energy-saving and emission-reducing effects are optimized.
The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clear and clear, and to implement the technical solutions according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present application and the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates a schematic diagram of an embodiment of a thermal management system of an electric vehicle of the present application.
FIG. 2 shows a schematic diagram of an embodiment of a heat pump air conditioning subsystem of the present application.
Fig. 3 is a schematic diagram illustrating an embodiment of a method flow for controlling the operation mode of the heat pump air conditioning subsystem 110 of the present application.
FIG. 4 shows a schematic diagram of an embodiment of a coolant circulation subsystem of the present application.
Fig. 5 is a schematic view showing an example of the arrangement position of the intermediate heat exchanger of the present application.
FIG. 6 is a schematic diagram illustrating one embodiment of a coolant circulation subsystem operating mode control flow of the present application.
FIG. 7 is a schematic diagram illustrating one embodiment of the control flow of the valves in the coolant circulation subsystem of the present application.
FIG. 8 shows a schematic diagram of an embodiment of a control flow for an intermediate heat exchanger valve of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
FIG. 1 illustrates a schematic diagram of an embodiment of a thermal management system of an electric vehicle of the present application.
As shown in fig. 1, the thermal management system 100 includes at least a heat pump air conditioning subsystem 110, an intermediate heat exchanger 120, and a coolant circulation subsystem 130.
The heat pump air conditioning subsystem 110 is used to provide cooling or heating services to the interior space of the vehicle cabin, that is, the heat pump air conditioning subsystem 110 is an air conditioning system of the vehicle. The core components of the heat pump air conditioning subsystem 110 are a compressor, and typically include at least a condenser, a throttling unit, and an evaporator.
FIG. 2 shows a schematic diagram of an embodiment of a heat pump air conditioning subsystem of the present application.
The heat pump air-conditioning subsystem 110 comprises a compressor 111, wherein an exhaust port of the compressor 111 is connected with an a end of a four-way valve 112, and a suction port is connected with an outlet of a gas-liquid separator 113;
the four-way valve 112 has its b-terminal connected to an inlet of an exterior heat exchanger A114 (the combination of the exterior heat exchanger and a condensing fan is one of embodiments of a condenser), its c-terminal connected to an inlet of a gas-liquid separator 113, and its d-terminal connected to an outlet of an interior heat exchanger 115 (the combination of an evaporating fan and an interior heat exchanger is one of embodiments of an evaporator), respectively;
an outlet of the exterior heat exchanger a 114 is connected to an inlet of an electronic expansion valve 116 (one of the embodiments of the throttle unit), and an outlet of the electronic expansion valve 116 is connected to an inlet of the interior heat exchanger 115.
The refrigeration process is as follows:
the compressor 111 generates a high-temperature high-pressure gas refrigerant, and the high-temperature high-pressure gas refrigerant enters the exterior heat exchanger A114 through an exhaust port and a four-way valve 112 pipeline and is cooled into a medium-temperature high-pressure liquid refrigerant;
the medium-temperature high-pressure liquid refrigerant is throttled by the electronic expansion valve 116 and expanded into a low-temperature low-pressure gas-liquid two-phase refrigerant;
the low-temperature low-pressure gas-liquid two-phase refrigerant passes through the heat exchanger 115 in the vehicle and is evaporated into a low-temperature low-pressure gas refrigerant; the air is blown by the evaporation fan through the heat exchanger 115 in the vehicle for cooling and then blown into the internal space of the carriage to realize the refrigeration effect;
the low-temperature and low-pressure gas refrigerant returns to the suction port of the compressor 111 through the four-way valve 112 and the gas-liquid separator 113, and is compressed into a high-temperature and high-pressure gas refrigerant through the compressor 111, thereby completing the refrigeration cycle of the heat pump air conditioning passage.
The heating process is as follows:
the compressor 111 generates a high-temperature and high-pressure gas refrigerant, and the gas refrigerant enters the in-vehicle heat exchanger 115 through the exhaust port and the four-way valve 112 pipeline and is cooled into a medium-temperature and high-pressure liquid refrigerant;
the medium-temperature high-pressure liquid refrigerant is throttled by the electronic expansion valve 116 and expanded into a low-temperature low-pressure gas-liquid two-phase refrigerant;
the low-temperature low-pressure gas-liquid two-phase refrigerant passes through the external heat exchanger A114 and is evaporated into a low-temperature low-pressure gas refrigerant; the air is heated by the heat exchanger 115 in the vehicle blown by the evaporation fan and then blown into the internal space of the carriage, so as to realize the heating effect;
the low-temperature low-pressure gas refrigerant returns to the suction port of the compressor 111 through the four-way valve 112 and the gas-liquid separator 113, and is compressed into a high-temperature high-pressure gas refrigerant through the compressor 111, so that the heating cycle of the heat pump air-conditioning subsystem is completed.
Fig. 3 is a schematic diagram illustrating an embodiment of a method flow for controlling the operation mode of the heat pump air conditioning subsystem 110 of the present application.
As shown in the figure, the heat pump air conditioning subsystem 110 may automatically determine the cooling cycle, heating cycle, or air supply mode according to the relationship between the temperature inside the vehicle cabin and the temperature set by the user. The specific control method comprises the following steps:
when a user starts a heat pump air conditioning passage (step S111), the temperature T in the vehicle interior is detectedIn-vehicleAnd the temperature value T set by the userSetting up(step S112),
if TIn-vehicle＞TSetting upIf +2 ℃, the refrigeration cycle is operated (step S113), the a-b conduction and the c-d conduction of the four-way valve 112 are performed, and the compressor is operated;
if TIn-vehicle＜TSetting upA heating cycle is operated at-2 ℃ (step S114), the four-way valve 112 is conducted with a-d and b-c, and the compressor is operated;
if TSetting up-2℃≤TIn-vehicle≤TSetting upIf the temperature is +2 ℃, the air supply mode is operated (step S115), the a-d and b-c of the four-way valve 112 are conducted, and the compressor is stopped;
re-detecting the interior temperature T of the vehicle compartment every predetermined time, e.g. 5minIn-vehicleAnd the temperature value T set by the userSetting upSo as to ensure that the temperature in the carriage is always maintained at about the temperature value set by the user.
FIG. 4 shows a schematic diagram of an embodiment of a coolant circulation subsystem of the present application.
The core component of the coolant circulation subsystem 130 is a water pump 131.
An outlet of the water pump 131 is connected to an inlet of a cooling liquid heating unit such as a PTC (positive temperature coefficient) electric heater 132 (a positive temperature coefficient heater, generally referred to as a ceramic heating element, but not limited thereto, which can heat a liquid), and an outlet of the PTC electric heater 132 is connected to inlets of the driving motor heat exchanger 133, the control module heat exchanger 134, and the battery pack heat exchanger 135, respectively. The coolant heating unit is used to heat the coolant, optionally being controllable to turn on and off to provide or not provide heating services.
The coolant circulation subsystem 130 also typically includes a coolant cooling unit, such as an offboard heat exchanger 139, for performing cooling services on the coolant.
When the cooling liquid circulation subsystem needs to operate the heating circulation, controlling the cooling liquid cooling unit not to provide cooling service and the cooling liquid heating unit to provide heating service; and/or, when the cooling liquid circulation subsystem is judged to need to operate the cooling circulation, controlling the cooling liquid cooling unit to provide the cooling service and controlling the cooling liquid heating unit not to provide the heating service.
The cooling liquid cooling unit is selectively communicated into the cooling liquid pipeline of the cooling liquid circulation subsystem through a fourth valve unit, and the fourth valve unit can be controlled to be communicated or closed, for example, when the cooling liquid circulation subsystem needs to execute cooling circulation, the fourth valve unit is controlled to be communicated, so that the cooling liquid pipeline of the cooling liquid cooling unit is communicated into the cooling liquid circulation pipeline of the cooling liquid circulation subsystem; when the cooling liquid circulation subsystem needs to execute heating circulation, the fourth valve unit is controlled to be closed, so that the cooling liquid pipeline of the cooling liquid cooling unit is not conducted into the cooling liquid circulation pipeline of the cooling liquid circulation subsystem.
Further, the coolant circulation subsystem 130 further includes a fourth valve unit, such as a three-way valve 138, for providing or not providing cooling services by controlling the fourth valve unit to selectively conduct the coolant line of the coolant cooling unit to the coolant circulation line of the coolant circulation subsystem through the fourth valve unit. The fourth valve unit can be controlled to be switched on or switched off, for example, when the cooling liquid circulation subsystem needs to execute cooling circulation, the fourth valve unit is controlled to be switched on, so that the cooling liquid pipeline of the cooling liquid cooling unit is switched on to the cooling liquid circulation pipeline of the cooling liquid circulation subsystem; when the cooling liquid circulation subsystem needs to execute heating circulation, the fourth valve unit is controlled to be closed, so that the cooling liquid pipeline of the cooling liquid cooling unit is not conducted into the cooling liquid circulation pipeline of the cooling liquid circulation subsystem. As an example, the first port f of the three-way valve 138 is connected to the input end of the coolant pipe of the coolant cooling unit, the second port g of the three-way valve 138 is connected to the output end of the coolant pipe of the coolant cooling unit, and the end g of the second valve port and the output end of the cooling liquid pipeline of the cooling liquid cooling unit are communicated with the water pump, the end e of the third valve port of the three-way valve 138 is communicated with the battery pack heat exchanger and/or other electronic component heat exchangers, wherein, when the cooling liquid circulation subsystem needs to run cooling circulation, the first valve port and the third valve port of the three-way valve are controlled to be conducted, whereby the cooling circuit of the cooling unit is conducted to provide a cooling service, and/or, when it is determined that the cooling fluid circulation subsystem needs to operate the heating cycle, the second valve port and the third valve port of the control three-way valve are communicated, so that the cooling pipeline of the cooling unit is disconnected and the cooling service cannot be provided.
Since the driving motor and the control module need to be prevented from being damaged by high-temperature operation and the battery pack needs to be maintained at an optimal operating temperature to ensure the working efficiency and the life span thereof, it is apparent that the driving motor and the control module and the battery pack have different requirements for temperature control, and therefore, it is desirable to selectively perform individualized cooling and heating processes on the driving motor and the control module and the battery pack, respectively. Further, the coolant circulation subsystem further comprises a second valve unit, such as a solenoid valve 136, disposed in the coolant line between the battery pack heat exchanger and the water pump in the coolant circulation subsystem, and/or a third valve unit, such as a solenoid valve 137, disposed in the coolant line between the other electronic component heat exchangers and the water pump in the coolant circulation subsystem; the second valve unit and/or the third valve unit is controlled to selectively flow cooling fluid through the battery pack heat exchanger and/or the other electronic component heat exchanger to cool or heat the battery pack and/or the other electronic component. As shown in fig. 4, the outlets of the driving motor heat exchanger 133 and the control module heat exchanger 134 are connected to the inlet of a third valve unit such as a solenoid valve 136, the outlet of the battery pack heat exchanger 135 is connected to the inlet of a second valve unit such as a solenoid valve 137, the outlets of the solenoid valve 136 and the solenoid valve 137 are connected to the e-terminal of a fourth valve unit such as a three-way valve 138, the f-terminal of the three-way valve 138 is connected to the inlet of a cooling liquid cooling unit such as an exterior heat exchanger 139, and the g-terminal of the three-way valve 138 is connected to the outlet of the exterior heat.
When the automobile runs under a high-temperature working condition, the driving motor, the battery pack and the control module need to dissipate heat, normal-temperature cooling liquid selectively enters the driving motor heat exchanger 133, the battery pack heat exchanger 135 and the control module heat exchanger 134 to be cooled through the water pump 131 and the PTC electric heater 132 (which is not started at this time), at this time, the e-f of the three-way valve 138 is conducted, and high-temperature cooling liquid enters the external heat exchanger 139 to be cooled and then enters the water pump 131, so that the cooling circulation of the cooling liquid circulation subsystem is completed.
When the automobile runs under a low-temperature working condition, the battery pack needs to be heated to maintain the optimal running temperature, the normal-temperature cooling liquid is heated into high-temperature cooling liquid through the water pump 131 and the PTC electric heater 132, then the high-temperature cooling liquid selectively enters the driving motor heat exchanger 133, the battery pack heat exchanger 135 and the control module heat exchanger 134 to be heated, at the moment, the e-g of the three-way valve 138 is conducted, and the heat-released cooling liquid directly returns to the water pump 131 without passing through the external heat exchanger 139, so that the heating circulation of the cooling liquid circulation subsystem is completed.
As shown in fig. 1, in order to improve the overall utilization of energy, the present application provides an intermediate heat exchanger 120 between the heat pump air conditioning subsystem 110 and the coolant circulation subsystem 130. When heat exchange is needed between the heat pump air-conditioning subsystem 110 and the cooling liquid circulation subsystem 130 at a proper time, the intermediate heat exchanger 120 exchanges heat between the refrigerant of the heat pump air-conditioning subsystem 110 and the cooling liquid in the cooling liquid circulation subsystem 130, so that reasonable distribution and comprehensive utilization of heat are realized, the comprehensive utilization rate of energy is improved, and the purposes of energy conservation and emission reduction are achieved.
As an example, the first heat exchange line of the intermediate heat exchanger 120 is connected in parallel with at least a portion of the refrigerant line of an indoor heat exchanger in the heat pump air conditioning subsystem 110, such as the on-board heat exchanger 111, so that the refrigerant flowing to the indoor heat exchanger can partially flow into the intermediate heat exchanger 120, and heat exchange with the coolant in the coolant circulation subsystem is achieved.
Further, in order to avoid energy loss when heat exchange is not required, a first valve unit, such as a solenoid valve, is connected to a passage where the intermediate heat exchanger 120 is connected to the heat pump air conditioning subsystem 110, so as to turn on or off the passage where the refrigerant in the heat pump air conditioning passage 110 flows into the intermediate heat exchanger 120 by controlling the first valve unit.
On the side of the coolant circulation subsystem 130, the second heat exchange pipeline of the intermediate heat exchanger 120 is disposed in a coolant pipeline of the coolant circulation subsystem, which is at least composed of a water pump, a coolant heating unit and a coolant cooling unit, and is used for flowing through a coolant to realize heat exchange with a refrigerant. Alternatively, as shown in the figure, the intermediate heat exchanger 120 is disposed between the water pump and the coolant heating unit (without limitation, as long as the coolant can flow through the intermediate heat exchanger 120), and since the heat pump energy efficiency ratio is much higher than that of the coolant heating unit, the energy in the heat pump air-conditioning subsystem 110 can be exchanged to the coolant circulation subsystem 130 through the intermediate heat exchanger 120, for example, the coolant exchanges heat with the low-temperature refrigerant in the heat pump air-conditioning subsystem through the intermediate heat exchanger 120 to enhance the cooling effect, or the coolant exchanges heat with the high-temperature refrigerant in the heat pump air-conditioning subsystem through the intermediate heat exchanger to achieve the heating effect, improve the energy utilization rate, and achieve energy saving.
Taking the heat pump air conditioning subsystem and the cooling liquid circulation subsystem shown in fig. 2 and 4 as examples, fig. 5 is a schematic diagram showing an embodiment of the arrangement position of the intermediate heat exchanger of the present application.
As shown in the drawing, the d-end of a fifth valve unit, such as a four-way valve 112, is connected to the outlet of the interior heat exchanger 111 and the outlet of the intermediate heat exchanger 120, respectively, the outlet of a throttling unit, such as an electronic expansion valve 116, is connected to the inlet of the interior heat exchanger 111 and the inlet of a solenoid valve 117, respectively, and the outlet of the solenoid valve 117 is connected to the inlet of the intermediate heat exchanger 120.
An outlet of the water pump 131 is connected to an inlet of the intermediate heat exchanger 120, and an outlet of the intermediate heat exchanger 120 is connected to an inlet of the PTC electric heater 132.
When the heat exchange between the heat pump air-conditioning subsystem 110 and the cooling liquid circulation subsystem 130 is detected to be required, the electromagnetic valve 117 is opened, one part of the low-temperature and low-pressure gas-liquid two-phase refrigerant throttled by the electronic expansion valve 116 exchanges heat with the cooling liquid through the intermediate heat exchanger 120 and is evaporated into a low-temperature and low-pressure gas refrigerant, and the other part of the low-temperature and low-pressure gas-liquid two-phase refrigerant still passes through the heat exchanger 115 in the vehicle and is evaporated into a low-temperature.
When the heat exchange between the heat pump air-conditioning subsystem 110 and the cooling liquid circulation subsystem 130 is detected to be required, the electromagnetic valve 117 is opened, a part of the high-temperature high-pressure gas refrigerant discharged by the compressor is cooled to be the medium-temperature high-pressure liquid refrigerant through the heat exchange between the intermediate heat exchanger 120 and the cooling liquid, and the other part of the high-temperature high-pressure gas refrigerant is still cooled to be the medium-temperature high-pressure liquid refrigerant through the heat exchanger 115 in the vehicle.
As an example, the cooling liquid circulation subsystem can automatically judge to run the cooling circulation, the heating circulation or stop running according to the temperature of the driving motor, the battery pack and the control module,
FIG. 6 is a schematic diagram illustrating one embodiment of a coolant circulation subsystem operating mode control flow of the present application.
As shown in the figure, when the automobile is started (step S131), it is detected whether the temperatures of the respective components satisfy the following conditions (step S132):
① temperature T of driving motorElectric machine< setting of motor cooling start temperature (numerical value is determined by motor characteristics)
② temperature T of battery packBattery pack< maximum operating temperature of the battery-10 ℃ (values are determined by battery characteristics)
③ control module temperature TModule< Module Cooling Start temperature setpoint (value determined by Module characteristics)
If 1 or more than 1 of the 3 conditions are not met, running a cooling cycle (step S133), starting the water pump 131, conducting the e-f end of the three-way valve 138, closing the PTC electric heater 132, opening the electromagnetic valve 136 (step S135), and allowing the cooling liquid to enter the driving motor heat exchanger 133 and the control module heat exchanger 134 to cool the cooling liquid;
if all of the 3 conditions are satisfied, the heating cycle is operated (step S134), the water pump 131 is turned on, the e-g port of the three-way valve 138 is turned on, and the solenoid valve 136 is turned off (step S136).
Further, when the cooling liquid circulation subsystem executes a cooling circulation, whether the temperature of the battery pack is lower than a first preset value is judged, and if yes, the second valve unit is controlled to be closed to stop cooling the battery pack; and/or when the cooling liquid circulation subsystem executes a heating circulation, judging whether the temperature of the battery pack is greater than a second preset value, and if so, controlling the second valve unit to close to stop cooling the battery pack. FIG. 7 is a schematic diagram illustrating one embodiment of the control flow of the valves in the coolant circulation subsystem of the present application.
As shown, the battery pack temperature is separately detected during the cooling cycle, if TBattery pack< minimum temperature of battery pack operation +10 ℃ (one of the predetermined temperature examples) (step S143), the solenoid valve 2 is closed (step S144), otherwise the solenoid valve 2 is opened (step S145), and the cooling liquid enters the battery pack heat exchanger to cool it;
separately detecting the temperature of the battery pack during operation of the heating cycle, if TBattery packAnd (4) the highest temperature of the battery pack operation is more than or equal to-10 ℃ (step S146), the electromagnetic valve 137 is closed (step S147), the cooling liquid circulation subsystem 130 stops operating, otherwise, the electromagnetic valve 137 is opened (step S148), and the cooling liquid enters the battery pack heat exchanger to heat the cooling liquid.
Further, fig. 8 shows a schematic diagram of an embodiment of a control flow of an intermediate heat exchanger valve of the present application.
As shown in the figure, when the cooling liquid circulation subsystem 130 operates a cooling cycle, the operation mode of the heat pump air-conditioning subsystem 110 is detected (step S151), if the operation mode is a cooling mode, the electromagnetic valve 117 is controlled to be opened (step S152), and the cooling liquid exchanges heat with a low-temperature refrigerant in the heat pump air-conditioning subsystem 110 through the intermediate heat exchanger 120, so as to enhance the cooling effect; in the heating mode, the control solenoid valve 117 is closed (step S153).
When the cooling liquid circulation subsystem 130 operates a heating cycle, detecting the operation mode of the heat pump air-conditioning subsystem 110 (step S151), if the operation mode is the heating mode, opening the control electromagnetic valve 117 (step S152), closing the PTC electric heater 132, and performing heat exchange between the cooling liquid and a high-temperature refrigerant in the heat pump air-conditioning subsystem 110 through the intermediate heat exchanger 120, wherein the energy efficiency ratio of the heat pump is far higher than that of the PTC electric heater 132, so that the energy-saving effect is realized; in the cooling mode, the solenoid valve 117 is closed (step S153), and the PTC electric heater 132 is turned on to ensure the heating effect of the coolant.
Optionally, at least one of the first valve unit, the second valve unit, the third valve unit, the fourth valve unit, and the fifth valve unit described above comprises: at least one of the solenoid valve, the electric valve, the manual valve, and the mechanical switch may be selectively conducted, without being limited thereto.
The thermal management system of the present application may further include a control unit, which may be a part of the control module of the electric vehicle, may also be one of the components of the heat pump air conditioning subsystem or the cooling fluid circulation subsystem, and may also be a separate module. The control unit performs the control on the first valve unit, the second valve unit, the third valve unit, the fourth valve unit, the cooling liquid heating unit and at least one of other valve units in the heat pump air-conditioning subsystem, such as a fifth valve unit and a throttling unit, such as an electronic expansion valve, an indoor fan and an outdoor fan, so as to realize the heat management among the heat pump air-conditioning subsystem, the cooling liquid circulation subsystem and the intermediate heat exchanger, so that each component can run efficiently and reliably and the comprehensive utilization rate of energy can be improved.
In the heat management system and the control method for the electric automobile and the electric automobile, the intermediate heat exchanger is arranged between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem, so that heat exchange can be carried out between all managed areas when needed, heat is efficiently and accurately distributed and utilized, the comprehensive utilization rate of energy is improved, and the effects of energy conservation and emission reduction are greatly optimized.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It will be understood by those skilled in the art that all or part of the steps of implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be various media capable of storing program codes, such as a read-only memory, a magnetic disk or an optical disk.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (10)
1. A thermal management system for an electric vehicle, comprising:
the heat pump air-conditioning subsystem is used for providing cooling or heating service for the internal space of the carriage; the heat pump air-conditioning subsystem can automatically judge the operation refrigeration cycle, heating cycle or air supply mode according to the relationship between the internal temperature of the carriage and the temperature value set by a user; the heat pump air-conditioning subsystem also comprises a first valve unit, a first heat exchange pipeline of the intermediate heat exchanger is connected into the heat pump air-conditioning subsystem through the first valve unit, and the first valve unit is controlled to turn on or off a refrigerant in the heat pump air-conditioning subsystem to flow into the first heat exchange pipeline of the intermediate heat exchanger; when the cooling liquid circulation subsystem needs to operate the heating circulation, controlling the cooling liquid cooling unit not to provide cooling service and the cooling liquid heating unit to provide heating service; when the cooling liquid circulation subsystem needs to operate the cooling circulation, controlling the cooling liquid cooling unit to provide cooling service and controlling the cooling liquid heating unit not to provide heating service;
a coolant circulation subsystem for providing cooling or heating services to at least some of the electronic components of the electric vehicle; the cooling liquid circulation subsystem can automatically judge to run cooling circulation, heating circulation or stop running according to the temperatures of the driving motor, the battery pack and the control module;
the intermediate heat exchanger is used for carrying out heat exchange when heat exchange is needed between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem; by arranging the intermediate heat exchanger between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem, heat exchange can be carried out between the managed areas when heat exchange is needed.
2. The thermal management system of an electric vehicle of claim 1, wherein:
the intermediate heat exchanger exchanges heat between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem when the cooling liquid circulation subsystem performs cooling circulation and the heat pump air-conditioning subsystem performs refrigeration circulation, or when the cooling liquid circulation subsystem performs heating circulation and the heat pump air-conditioning subsystem performs heating circulation;
and/or the presence of a gas in the gas,
the first heat exchange pipeline of the intermediate heat exchanger is connected with at least part of refrigerant pipelines of the indoor heat exchanger in the heat pump air-conditioning subsystem in parallel, so that the refrigerant flowing to the indoor heat exchanger can partially flow into the intermediate heat exchanger;
and/or the presence of a gas in the gas,
the cooling liquid circulation subsystem comprises a water pump, a cooling liquid heating unit and a cooling liquid cooling unit,
and the second heat exchange pipeline of the intermediate heat exchanger is arranged in a cooling liquid pipeline of the cooling liquid circulation subsystem, which is at least composed of a water pump in the cooling liquid circulation subsystem, a cooling liquid heating unit in the cooling liquid circulation subsystem and a cooling liquid cooling unit in the cooling liquid circulation subsystem, and is used for flowing through cooling liquid.
3. The thermal management system of an electric vehicle of claim 1, wherein:
the cooling liquid circulation system also comprises a fourth valve unit, and a cooling liquid pipeline of the cooling liquid cooling unit in the cooling liquid circulation subsystem is selectively communicated to a cooling liquid circulation pipeline in the cooling liquid circulation subsystem through the fourth valve unit so as to provide or not provide cooling service;
and/or the presence of a gas in the gas,
a coolant heating unit in the coolant circulation subsystem, which can be controlled to be switched on or off to provide or not provide heating service;
and/or the presence of a gas in the gas,
the coolant circulation subsystem further comprises a second valve unit and/or a third valve unit,
a second valve unit disposed in a coolant line between a battery pack heat exchanger in the coolant circulation subsystem and a water pump in the coolant circulation subsystem;
a third valve unit arranged in a cooling liquid pipeline between other electronic component heat exchangers in the cooling liquid circulation subsystem and a water pump in the cooling liquid circulation subsystem;
selectively flowing coolant through a battery pack heat exchanger in the coolant circulation subsystem and/or other electronic component heat exchangers in the coolant circulation subsystem to cool or heat a battery pack and/or other electronic components by control of a second valve unit and/or a third valve unit.
4. The thermal management system of an electric vehicle of claim 3, wherein:
when the cooling circulation subsystem executes the cooling circulation, whether the temperature of the battery pack is lower than a first preset value is judged, if yes, the second valve unit is controlled to be closed to stop cooling the battery pack, and/or,
when the cooling liquid circulation subsystem executes heating circulation, judging whether the temperature of the battery pack is greater than a second preset value, if so, controlling a second valve unit to close to stop cooling the battery pack;
and/or the presence of a gas in the gas,
the fourth valve unit is a three-way valve,
a first valve port of the three-way valve is communicated with an input end of a cooling liquid pipeline of a cooling liquid cooling unit in the cooling liquid circulation subsystem, a second valve port of the three-way valve is communicated with an output end of the cooling liquid pipeline of the cooling liquid cooling unit in the cooling liquid circulation subsystem, the second valve port of the three-way valve and the output end of the cooling liquid pipeline of the cooling liquid cooling unit in the cooling liquid circulation subsystem are communicated with a water pump in the cooling liquid circulation subsystem, and a third valve port of the three-way valve is communicated with a second valve unit and/or a third valve unit,
wherein the content of the first and second substances,
when the cooling liquid circulation subsystem needs to run cooling circulation, the first valve port and the third valve port of the three-way valve are controlled to be conducted,
and/or when the cooling liquid circulation subsystem needs to operate heating circulation, the second valve port and the third valve port of the three-way valve are controlled to be communicated;
and/or the presence of a gas in the gas,
the cooling liquid heating unit in the cooling liquid circulation subsystem is a PTC electric heater;
and/or the presence of a gas in the gas,
the cooling liquid cooling unit in the cooling liquid circulation subsystem is an outdoor heat exchanger;
and/or the presence of a gas in the gas,
at least one of the first valve unit, the second valve unit, the third valve unit, and the fourth valve unit includes: at least one of an electromagnetic valve, an electric valve, a manual valve and a mechanical switch.
5. The thermal management system for electric vehicles according to any one of claims 2 to 4, wherein:
the heat management system of the electric automobile further comprises a control unit, and the control unit controls the first valve unit, the second valve unit, the third valve unit, the fourth valve unit, the cooling liquid heating unit in the cooling liquid circulation subsystem and at least one of the valve unit, the throttling unit, the indoor fan and the outdoor fan in the heat pump air-conditioning subsystem so as to realize heat management among the heat pump air-conditioning subsystem, the cooling liquid circulation subsystem and the intermediate heat exchanger.
6. A control method of a thermal management system of an electric vehicle, the thermal management system including a heat pump air conditioning subsystem for providing a cooling or heating service to a vehicle cabin interior space, a coolant circulation subsystem for providing a cooling or heating service to at least a part of electronic components of the electric vehicle, and an intermediate heat exchanger for providing a heat exchange service between the heat pump air conditioning subsystem and the coolant circulation subsystem, the method comprising:
when heat exchange is needed between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem, controlling to enable the intermediate heat exchanger to carry out heat exchange; the heat pump air-conditioning subsystem can automatically judge the operation refrigeration cycle, heating cycle or air supply mode according to the relationship between the internal temperature of the carriage and the temperature value set by a user; the cooling liquid circulation subsystem can automatically judge to run cooling circulation, heating circulation or stop running according to the temperatures of the driving motor, the battery pack and the control module;
the heat pump air-conditioning subsystem also comprises a first valve unit, a first heat exchange pipeline of the intermediate heat exchanger is connected into the heat pump air-conditioning subsystem through the first valve unit, and the first valve unit is controlled to turn on or off a refrigerant in the heat pump air-conditioning subsystem to flow into the first heat exchange pipeline of the intermediate heat exchanger; when the cooling liquid circulation subsystem needs to operate the heating circulation, controlling the cooling liquid cooling unit not to provide cooling service and the cooling liquid heating unit to provide heating service; when the cooling liquid circulation subsystem needs to operate the cooling circulation, controlling the cooling liquid cooling unit to provide cooling service and controlling the cooling liquid heating unit not to provide heating service;
by arranging the intermediate heat exchanger between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem, heat exchange can be carried out between the managed areas when heat exchange is needed.
7. The control method of the thermal management system of the electric vehicle according to claim 6, characterized in that:
the intermediate heat exchanger exchanges heat between the heat pump air-conditioning subsystem and the cooling liquid circulation subsystem when the cooling liquid circulation subsystem performs cooling circulation and the heat pump air-conditioning subsystem performs refrigeration circulation, or when the cooling liquid circulation subsystem performs heating circulation and the heat pump air-conditioning subsystem performs heating circulation;
and/or the presence of a gas in the gas,
the first heat exchange pipeline of the intermediate heat exchanger is connected with at least part of refrigerant pipelines of the indoor heat exchanger in the heat pump air-conditioning subsystem in parallel, so that the refrigerant flowing to the indoor heat exchanger can partially flow into the intermediate heat exchanger;
and/or the presence of a gas in the gas,
the cooling liquid circulation subsystem comprises a water pump, a cooling liquid heating unit and a cooling liquid cooling unit,
and the second heat exchange pipeline of the intermediate heat exchanger is arranged in a cooling liquid pipeline of the cooling liquid circulation subsystem, which is at least composed of a water pump in the cooling liquid circulation subsystem, a cooling liquid heating unit in the cooling liquid circulation subsystem and a cooling liquid cooling unit in the cooling liquid circulation subsystem, and is used for flowing through cooling liquid.
8. The control method of the thermal management system of the electric vehicle according to claim 6, characterized in that:
the cooling liquid circulation subsystem further comprises a fourth valve unit, and the fourth valve unit is controlled to enable a cooling liquid pipeline of a cooling liquid cooling unit in the cooling liquid circulation subsystem to be selectively conducted to the cooling liquid circulation pipeline of the cooling liquid circulation subsystem through the fourth valve unit so as to provide or not provide the cooling service;
and/or the presence of a gas in the gas,
controlling a coolant heating unit in the coolant circulation subsystem to turn on or off to provide or not provide the heating service;
and/or the presence of a gas in the gas,
the coolant circulation subsystem further comprises a second valve unit and/or a third valve unit,
a second valve unit disposed in a coolant line between a battery pack heat exchanger in the coolant circulation subsystem and a water pump in the coolant circulation subsystem;
a third valve unit arranged in a cooling liquid pipeline between other electronic component heat exchangers in the cooling liquid circulation subsystem and a water pump in the cooling liquid circulation subsystem;
the coolant is selectively flowed through a battery pack heat exchanger in the coolant circulation subsystem and/or other electronic component heat exchangers in the coolant circulation subsystem to cool or heat a battery pack and/or other electronic components by control of a second valve unit and/or a third valve unit.
9. The control method of the thermal management system of the electric vehicle according to claim 8, characterized in that:
when the cooling circulation subsystem executes the cooling circulation, whether the temperature of the battery pack is lower than a first preset value is judged, if yes, the second valve unit is controlled to be closed to stop cooling the battery pack, and/or,
when the cooling liquid circulation subsystem executes heating circulation, judging whether the temperature of the battery pack is greater than a second preset value, if so, controlling a second valve unit to close to stop cooling the battery pack;
and/or the presence of a gas in the gas,
the fourth valve unit is a three-way valve,
a first valve port of the three-way valve is communicated with an input end of a cooling liquid pipeline of a cooling liquid cooling unit in the cooling liquid circulation subsystem, a second valve port of the three-way valve is communicated with an output end of the cooling liquid pipeline of the cooling liquid cooling unit in the cooling liquid circulation subsystem, the second valve port of the three-way valve and the output end of the cooling liquid pipeline of the cooling liquid cooling unit in the cooling liquid circulation subsystem are communicated with a water pump in the cooling liquid circulation subsystem, and a third valve port of the three-way valve is communicated with a second valve unit and/or a third valve unit,
wherein the content of the first and second substances,
when the cooling liquid circulation subsystem needs to operate the cooling circulation, the first valve port and the third valve port of the three-way valve are controlled to be conducted,
and/or controlling the conduction of a second valve port and a third valve port of the three-way valve when the cooling liquid circulation subsystem needs to operate heating circulation;
and/or the presence of a gas in the gas,
the cooling liquid heating unit in the cooling liquid circulation subsystem is a PTC electric heating unit;
and/or the presence of a gas in the gas,
the cooling liquid cooling unit in the cooling liquid circulation subsystem is an outdoor heat exchanger;
and/or the presence of a gas in the gas,
at least one of the first valve unit, the second valve unit, the third valve unit, and the fourth valve unit includes: at least one of an electromagnetic valve, an electric valve, a manual valve and a mechanical switch.
10. An electric vehicle characterized by comprising the thermal management system of the electric vehicle according to any one of claims 1 to 5.
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| CN109383228B (en) * | 2018-09-29 | 2020-05-05 | 珠海格力电器股份有限公司 | Heat pump air conditioner and control method thereof |
| CN109378550B (en) * | 2018-11-15 | 2024-03-08 | 珠海格力电器股份有限公司 | Automobile air conditioner and new energy automobile |
| WO2022087935A1 (en) * | 2020-10-29 | 2022-05-05 | 浙江吉利控股集团有限公司 | Multi-loop heat-pump air conditioning system supporting low-temperature start of automobile, and automobile |
| CN113183715A (en) * | 2021-05-27 | 2021-07-30 | 深圳昂湃技术有限公司 | Electric automobile integrated thermal management system and implementation method |
| CN113370748B (en) * | 2021-07-14 | 2023-09-29 | 珠海格力电器股份有限公司 | Thermal management system and electric automobile |
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| CN101855100A (en) * | 2007-11-13 | 2010-10-06 | 贝洱两合公司 | The cooling mechanism of automobile thermal source |
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