CN112224091A - Electric automobile heat management system and control method thereof - Google Patents
Electric automobile heat management system and control method thereof Download PDFInfo
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- CN112224091A CN112224091A CN202011106866.2A CN202011106866A CN112224091A CN 112224091 A CN112224091 A CN 112224091A CN 202011106866 A CN202011106866 A CN 202011106866A CN 112224091 A CN112224091 A CN 112224091A
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- battery
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- air conditioning
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- 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
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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
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
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- 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
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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
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H2001/00307—Component temperature regulation using a liquid flow
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- 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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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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
- Y02T10/60—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)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention discloses an electric automobile heat management system and a control method thereof, which improve the energy efficiency ratio of an automobile air conditioner during heating by adding an air-supplementing and enthalpy-increasing module in a heating cycle and canceling a PTC heating module in a battery, and monitor the temperature of each position of an automobile at the same time, so that the heat of the automobile can be fully transferred to achieve the aim of a user without consuming electric energy to refrigerate or heat like the prior automobile. The automobile air conditioning system is directly taken over when charging, so that the air conditioning system can directly acquire electric energy from the charging pile without acquiring the electric energy from the battery, the rapid aging of the battery is avoided, the air conditioning mode opened by a user last time is acquired simultaneously, if the air conditioning mode is a heating mode, heat is stored in the water tank, if the air conditioning mode is a refrigerating mode, cold is stored in the water tank, so that the user does not need to manufacture cold or heat by consuming the electric energy of the electric automobile when needing to use, and the cruising mileage of the automobile can be greatly increased.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to an electric automobile heat management system and a control method thereof.
Background
Based on the current energy situation of 'rich coal, lean oil and less gas' in China, the electric automobile is gradually becoming a key industry of national key support. The electric automobile can generate a large amount of heat in the charging and discharging process, and the influence of the temperature on the electric automobile is very large.
The automobile can generate electricity shortage phenomenon at low temperature, and the charging rate is low, so that the power battery of the automobile needs to be heated, and meanwhile, heat preservation measures are made for the battery, so that the charging and discharging efficiency of the battery is ensured. After experiments, the data are shown in fig. 1 and fig. 2. Besides the charge and discharge capacity, the temperature also affects the cycle number of the power battery, for example, the electrolyte, the anode and cathode materials and the separator are accelerated by high temperature. According to the experimental results of fig. 1 and 2, when the battery of the electric vehicle is between 0 ℃ and 40 ℃, the battery is in a high charge-discharge efficiency interval and does not affect the cycle number of the battery.
In addition, the optimum residence time for the human body is 22 to 26 ℃. When refrigerating in summer, the temperature of the heat exchanger of the automobile air-conditioning system is lower than the target set temperature of a user by 10 ℃ to 15 ℃ to realize refrigeration, and when heating in winter, the temperature of the heat exchanger of the automobile air-conditioning system is higher than the target set temperature of the user by 10 ℃ to 15 ℃ to realize heating. That is, the automotive air conditioning system heat exchanger operates at a temperature between 0 ℃ and 40 ℃.
Therefore, the temperature of the battery in the high charge-discharge efficiency interval and the working temperature of the heat exchanger of the air conditioning system have a large overlap interval, that is, if the temperature of the battery is at the same level as the temperature of the heat exchanger of the automobile, the charge-discharge efficiency is at a higher level. The existing electric automobile does not well combine the two.
Disclosure of Invention
Based on the above, a new electric vehicle thermal system management method is provided for solving the problem that the battery operating temperature of the traditional electric vehicle is too high or too low.
It should be noted that the vapor-supplementing enthalpy-increasing process adopts a two-stage throttling middle gas injection technology, and adopts a flash tank to perform gas-liquid separation, so as to realize the enthalpy-increasing effect. The air compressor is compressed and mixed cooled by air injection at medium and low pressure, and then is normally compressed at high pressure, so that the air displacement of the compressor is increased, and the purpose of improving the heating capacity in a low-temperature environment is achieved.
The specific technical scheme is as follows:
the heat management system of the electric automobile comprises a heating cycle and a water cycle;
the heating cycle comprises an air-supplying enthalpy-increasing module, and the air-supplying enthalpy-increasing module comprises a flash tank and an electromagnetic valve; the water circulation comprises a water pump, a water tank, a first water valve, a second water valve, a third water valve, a fourth water valve, a fifth water valve, an automobile heat exchanger and a battery heat exchanger;
the first ends of the battery heat exchanger and the automobile heat exchanger are fixedly connected to a water pump through water pipes, and the second ends of the battery heat exchanger and the automobile heat exchanger are fixedly connected to a water tank through water pipes. The automobile heat exchanger and the battery heat exchanger form series water circulation by closing a fourth water valve and opening a fifth water valve; the automobile heat exchanger and the battery heat exchanger form parallel water circulation by opening a fourth water valve and closing a fifth water valve; and the heating circulation and the water circulation exchange heat through a plate heat exchanger.
Further, when the ambient temperature is less than 0 ℃ and the heating cycle is started, the electromagnetic valve is opened.
A control method of an electric vehicle thermal management system comprises the electric vehicle thermal management system, and when an electric vehicle is charged, the following steps are executed:
1) disconnecting the battery from the vehicle air conditioning system;
2) the charging pile is directly and electrically connected with an automobile air conditioning system;
3) acquiring the last time of opening of the automobile air conditioning mode by a user, and if the automobile air conditioning mode is the heating mode, enabling the automobile air conditioning system to start the heating cycle, starting a water pump in a water system, and heating the whole water system to 40 ℃; if the automobile air conditioning system is in the refrigeration mode, the automobile air conditioning system starts refrigeration circulation, a water pump in a water system is started, and the whole water system is refrigerated to 0 ℃.
Further, the following steps are performed when the electric vehicle is discharging or not operating:
1) acquiring the ambient temperature of the position of the electric automobile;
2) acquiring the temperature of a power battery of the electric automobile;
3) if the ambient temperature is less than 0 ℃ and the temperature of the battery is less than 0 ℃, step 4 is performed. If the battery temperature is higher than 40 ℃, executing the step 5;
4) the automobile air conditioner starts a heating cycle and/or a water cycle, and simultaneously starts an air-supplementing and enthalpy-increasing function;
5) the automobile air conditioner starts a refrigeration cycle and/or a water cycle.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.
Furthermore, the drawings are not to scale of 1:1, and the relative dimensions of the various elements in the drawings are drawn only by way of example and not necessarily to true scale.
Fig. 1 is a graph showing the results of the discharge test.
Fig. 2 is a graph showing the results of the charge test.
Fig. 3 is a diagram of a cooling mode of an automotive air conditioning system.
Fig. 4 is a heating mode diagram of an automotive air conditioning system.
Description of reference numerals:
1. the temperature control system comprises a first water valve, a second water valve, a third water valve, a fourth water valve, a battery heat exchanger, a fifth water valve, a 10, a first throttle valve, a 11, a first heat exchanger, a 12, a flash tank, a 13, a second throttle valve, a 14, an electromagnetic valve, a 15, a second heat exchanger, a 16, a four-way valve, a 17, a compressor, a 31, a first battery temperature sensing package, a 32, a second battery temperature sensing package, a 33, a third battery temperature sensing package, a 34, a fourth battery temperature sensing package, a 41, a temperature sensing package of the automobile heat exchanger, a 42, a temperature sensing package of the first heat exchanger, a 43 and a temperature sensing package of the second heat exchanger.
An A-interface, a B-interface, a C-interface and a D-interface.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
The invention discloses a management method of an electric automobile heat system, which improves the energy efficiency ratio of an automobile air conditioner during heating by adding an air-supplying and enthalpy-increasing module in a heating cycle of an electric automobile air conditioner system, and detects the temperature of each position of the electric automobile at the same time, so that the heat or the cold of the electric automobile can be fully transferred to achieve the aim of regulating and controlling the temperature of different parts of the electric automobile by a user, and the electric automobile does not consume electric energy to refrigerate or heat like the traditional automobile. Thus, although the electric energy required by the water pump is consumed, the energy consumption can be greatly reduced compared with the electric energy required by cooling and heating, and the endurance mileage of the electric automobile is prolonged.
If the electric automobile is under the mode of charging, fill electric pile and directly supply power for air conditioning system can directly acquire the electric energy from filling electric pile, and need not acquire from the battery, has avoided electric automobile's power battery to discharge while charging like this. If the temperature is higher than 40 ℃ during charging of the battery, the aging of the electrolyte, the anode and cathode materials and the diaphragm is accelerated due to the high temperature, and at the moment, the refrigeration circulation system can be started and/or the water path circulation can be opened to reduce the temperature of the battery. If the temperature is lower than 0 ℃ during battery charging, the low temperature can greatly reduce the rate of charging the battery by the charging pile, and can reduce the upper limit of the battery capacity, that is, the battery cannot be charged to the nominal capacity of the battery by the charging pile, and at this moment, the heating circulation system should be opened and/or the water circulation should be opened to raise the temperature of the battery.
And meanwhile, the control system acquires the automobile air conditioning mode which is opened last time by a user, and if the automobile air conditioning mode is the heating mode, the automobile air conditioning system starts heating circulation, a water pump in a water system is started, and the whole water system is heated to 40 ℃. If the automobile air conditioning system is in the refrigeration mode, the automobile air conditioning system starts refrigeration circulation, a water pump in a water system is started, and the whole water system is refrigerated to 0 ℃.
The operation enables a user not to consume the electric energy of the electric automobile to manufacture cold or heat to control the temperature of the battery to be in a proper range when the electric automobile needs to be used, and the endurance mileage of the automobile can be greatly increased. And a PTC heating module is not required to be added into the battery independently, so that the cost is reduced. The heating energy efficiency ratio of the PTC heating module is less than 1, and the battery is heated by the heating system with air supply and enthalpy increase, so that the energy efficiency ratio is more than 1, and the heating at minus 20 ℃ is not attenuated.
When the electric automobile is discharged or does not work, the electric automobile is divided into two conditions of the ambient temperature being less than 0 ℃ or the ambient temperature being more than 0 ℃.
When the ambient temperature is 0 ℃, the charging/discharging efficiency is greatly influenced, and the interior of the vehicle and the battery need to be heated.
There are three cases at this time.
First, the battery temperature is 0 ℃.
If the interior of the automobile needs to be heated, the automobile air conditioning system heats, and at the moment, after the refrigerant comes out of the compressor 17, the refrigerant enters from the four-way valve interface A, flows out from the interface D, and enters from the interface B when returning, and flows out from the interface C. The vapor-supplementing enthalpy-increasing module is opened, i.e., the solenoid valve 14 is opened. The first water valve 1 is opened, the second water valve 2 is opened, the fifth water valve 9 is closed, the fourth water valve 8 is opened, the third water valve 6 is opened, the water pump 5 is opened, when gas in the vehicle circulates in the vehicle, the gas in the vehicle is heated after passing through the automobile heat exchanger 4 to generate hot air to be sent into the vehicle, when gas outside the vehicle enters, the gas outside the vehicle is heated after passing through the automobile heat exchanger 4 to generate hot air to be sent into the vehicle.
If the interior of the automobile needs to be cooled, the automobile air conditioning system heats, and at the moment, after the refrigerant comes out of the compressor 17, the refrigerant enters from the four-way valve interface A and flows out of the interface D, and when the refrigerant returns, the refrigerant enters from the interface B and flows out of the interface C. The air-supplying enthalpy-increasing module is started, namely the electromagnetic valve 14 is opened, the first water valve 1 is opened, the fifth water valve 9 is closed, the fourth water valve 8 is opened, the third water valve 6 is opened, the water pump 5 is opened, the automobile air conditioning system heats the battery, the second water valve 2 is closed, gas can be directly sucked from the interior of the automobile and flows out of an air outlet in the automobile, at the moment, the automobile heat exchanger 4 does not heat the gas passing through the device, the gas is sucked from the exterior of the automobile, the automobile heat exchanger 4 does not heat the gas passing through the device, and at the moment, the air blown out from the air outlet in the automobile is.
If the air conditioner is not needed in the automobile, the automobile air conditioning system heats, and at the moment, after the refrigerant comes out of the compressor 17, the refrigerant enters from the four-way valve interface A and flows out from the interface D, and when the refrigerant returns, the refrigerant enters from the interface B and flows out from the interface C. The air-supplying enthalpy-increasing module is started, namely the electromagnetic valve 14 is opened, the first water valve 1 is opened, the second water valve 2 is closed, the fifth water valve 9 is closed, the fourth water valve 8 is opened, the third water valve 6 is opened, the water pump 5 is opened, the automobile air-conditioning system heats the battery, and at the moment, the fan matched with the automobile heat exchanger 4 is not moved.
Second, 0 ℃ < cell temperature <40 ℃.
If the interior of the automobile needs to be heated, the automobile air conditioning system heats, the air supplementing and enthalpy increasing module is closed, namely the electromagnetic valve 14 is closed, the air supplementing and enthalpy increasing module is not opened at the ambient temperature, and the energy efficiency ratio of the air conditioner is not reduced. The first water valve 1 is closed, the second water valve 2 is opened, the water system is heated to 40 ℃, gas passes through the automobile heat exchanger 4, and at the moment, hot air is blown from the air outlet of the automobile air conditioner.
If the interior of the automobile needs to be refrigerated, the automobile air conditioning system refrigerates, and at the moment, after the refrigerant comes out of the compressor 17, the refrigerant enters from the four-way valve interface A and flows out of the interface B, and when the refrigerant returns, the refrigerant enters from the interface D and flows out of the interface C. When the air-supplying enthalpy-increasing module is closed, namely the electromagnetic valve 14 is closed, the first water valve 1 is closed, the fourth water valve 8 is closed, the fifth water valve 9 is closed, the second water valve 2 is opened, the refrigerating system starts to refrigerate, the refrigerating temperature of the water system is reduced to 1 ℃, gas passes through the automobile heat exchanger 4, and at the moment, the air outlet of the automobile air conditioner blows cold air.
If the air conditioner is not needed in the vehicle, no operation is needed, and the running temperature of the battery is in a region with high charging and discharging efficiency.
Third, battery temperature > -40 ℃.
If the interior of the automobile needs to be heated, the automobile air conditioning system is not moved, the air-supplying and enthalpy-increasing module is closed, namely the electromagnetic valve 14 is closed, the water path internal circulation is opened, at the moment, the third water valve 6 is closed, the fourth water valve 8 is closed, the fifth water valve 9 is opened, the water pump is opened, the automobile heat exchanger 4 and the battery heat exchanger 3 form a closed circulation system, and all heat required by heating of the automobile air conditioner can be obtained from the battery heat exchanger 3. The battery heat exchanger 3 absorbs the heat of the battery, so that the temperature of the battery can be reduced, extra energy is not consumed to drive an automobile air conditioning system, the energy of an automobile is greatly saved, at the moment, the gas passes through the automobile heat exchanger 4 and is heated, and the air blown by the fan is hot air, so that the aim that a user wants to heat is fulfilled.
If refrigeration is needed in the vehicle, the vehicle air conditioning system refrigerates, the air-supplying enthalpy-increasing module is closed, namely the electromagnetic valve 14 is closed, the first water valve 1 is opened, the second water valve 2 is opened, the fifth water valve 9 is closed, the fourth water valve 8 is closed, the third water valve 6 is opened, the vehicle air conditioning system refrigerates, and at the moment, the water pump is opened, so that the temperatures of the vehicle heat exchanger 4 and the battery heat exchanger 3 can be reduced at the same time, and the temperatures of the battery and the vehicle can be reduced at the same time.
If an air conditioner is not needed in the vehicle, the vehicle air conditioning system refrigerates, the air supplementing and enthalpy increasing module is closed, namely the electromagnetic valve 14 is closed, the water channel internal circulation is started, the third water valve 6 is closed, the fourth water valve 8 is closed, the fifth water valve 9 is opened, the water pump is opened, the vehicle heat exchanger 4 and the battery heat exchanger 3 form a closed circulation system, and all cooling capacity required by the battery can be obtained from water in the water circulation system.
When the ambient temperature >0 ℃, the case where the battery temperature < 0 ℃ cannot exist, so there are only two cases at this time.
First, 0 ℃ < cell temperature <40 ℃.
If the interior of the automobile needs to be heated, the automobile air-conditioning system heats, the air-supplying and enthalpy-increasing module is closed, the first water valve 1 is closed, the fourth water valve 8 is closed, the fifth water valve 9 is closed, the third water valve 6 is opened, the second water valve 2 is opened, the air passes through the automobile heat exchanger 4 and is heated by the automobile heat exchanger 4, and at the moment, the air outlet of the automobile air-conditioning blows hot air.
If the interior of the automobile needs to be refrigerated, the automobile air conditioning system refrigerates, the air-supplying and enthalpy-increasing module is closed, the first water valve 1 is closed, the fourth water valve 8 is closed, the fifth water valve 9 is closed, the third water valve 6 is opened, at the moment, the gas inside the automobile or the gas outside the automobile is cooled when passing through the automobile heat exchanger 4, and the air blown out of the air outlet in the automobile is cold air.
If the air conditioner is not needed in the vehicle, the operation is not needed, and the running temperature of the battery is in a region with high charging and discharging efficiency.
Second, the battery temperature > -40 ℃.
If the vehicle needs to be heated, the vehicle air conditioning system is not moved, the air-supplying and enthalpy-increasing module is closed, namely the electromagnetic valve 14 is closed, the internal circulation is started, the third water valve 6 is closed, the fourth water valve 8 is closed, the fifth water valve 9 is opened, the water pump is opened, the vehicle heat exchanger 4 and the battery heat exchanger 3 form a closed circulation system, and all heat required by the vehicle air conditioning can be obtained from the battery heat exchanger 3. The battery heat exchanger 3 absorbs the heat of the battery, so that the temperature of the battery can be reduced, extra energy is not consumed to drive an automobile air conditioning system, the energy of an automobile is greatly saved, at the moment, the gas passes through the automobile heat exchanger 4 and is heated, and the air blown by the fan is hot air, so that the aim that a user wants to heat is fulfilled.
If refrigeration is needed in the vehicle, the vehicle air conditioning system refrigerates, the air-supplying enthalpy-increasing module is closed, namely the electromagnetic valve 14 is closed, the first water valve 1 is opened, the second water valve 2 is opened, the fifth water valve 9 is closed, the fourth water valve 8 is closed, the third water valve 6 is opened, the vehicle air conditioning system refrigerates, and at the moment, the water pump is opened, so that the temperatures of the vehicle heat exchanger 4 and the battery heat exchanger 3 can be reduced at the same time, and the temperatures of the battery and the vehicle can be reduced at the same time.
If an air conditioner is not needed in the vehicle, the vehicle air conditioning system refrigerates, the air supplementing and enthalpy increasing module is closed, namely the electromagnetic valve 14 is closed, the internal circulation is started, the third water valve 6 is closed, the fourth water valve 8 is closed, the fifth water valve 9 is opened, the water pump is opened, the vehicle heat exchanger 4 and the battery heat exchanger 3 form a closed circulation system, and all cooling capacity required by the battery can be obtained from water in the water circulation system.
In the above embodiments, the coolant of the water circulation system uses water as a medium to transport heat or cold, and under the condition of not changing the original scheme, an anti-freezing solution can be used to replace the coolant function of water, for example, a 30% propanol aqueous solution.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. The heat management system of the electric automobile comprises a heating cycle and a water cycle;
the heating cycle comprises an air-supplying enthalpy-increasing module, and the air-supplying enthalpy-increasing module comprises a flash tank and an electromagnetic valve; the water circulation comprises a water pump, a water tank, a first water valve, a second water valve, a third water valve, a fourth water valve, a fifth water valve, an automobile heat exchanger and a battery heat exchanger;
the automobile heat exchanger is characterized in that first ends of the battery heat exchanger and the automobile heat exchanger are fixedly connected to a water pump through water pipes, and second ends of the battery heat exchanger and the automobile heat exchanger are fixedly connected to a water tank through water pipes;
the automobile heat exchanger and the battery heat exchanger form series water circulation by closing a fourth water valve and opening a fifth water valve; the automobile heat exchanger and the battery heat exchanger form parallel water circulation by opening a fourth water valve and closing a fifth water valve; and the heating circulation and the water circulation exchange heat through a plate heat exchanger.
2. The thermal management system of an electric vehicle of claim 1, wherein said solenoid valve is opened when the heating cycle is opened at an ambient temperature of 0 ℃.
3. A method for controlling an electric vehicle thermal management system, comprising the electric vehicle thermal management system of claim 1, wherein the following steps are performed when the electric vehicle is charged:
1) disconnecting the battery from the vehicle air conditioning system;
2) the charging pile is directly and electrically connected with an automobile air conditioning system;
3) acquiring the last time of opening of the automobile air conditioning mode by a user, and if the automobile air conditioning mode is the heating mode, enabling the automobile air conditioning system to start the heating cycle, starting a water pump in a water system, and heating the whole water system to 40 ℃; if the automobile air conditioning system is in the refrigeration mode, the automobile air conditioning system starts refrigeration circulation, a water pump in a water system is started, and the whole water system is refrigerated to 0 ℃.
4. The control method of the electric vehicle thermal management system according to claim 3, wherein the following steps are executed when the electric vehicle is discharged or not in operation:
1) acquiring the ambient temperature of the position of the electric automobile;
2) acquiring the temperature of a power battery of the electric automobile;
3) if the ambient temperature is less than 0 ℃ and the temperature of the battery is less than 0 ℃, executing the step 4;
if the battery temperature is higher than 40 ℃, executing the step 5;
4) the automobile air conditioner starts a heating cycle and/or a water cycle, and simultaneously starts an air-supplementing and enthalpy-increasing function;
5) the automobile air conditioner starts a refrigeration cycle and/or a water cycle.
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