CN112977158A - Electric automobile heat management method and device, vehicle control unit and electric automobile - Google Patents

Electric automobile heat management method and device, vehicle control unit and electric automobile Download PDF

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Publication number
CN112977158A
CN112977158A CN202110267360.8A CN202110267360A CN112977158A CN 112977158 A CN112977158 A CN 112977158A CN 202110267360 A CN202110267360 A CN 202110267360A CN 112977158 A CN112977158 A CN 112977158A
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China
Prior art keywords
actual temperature
temperature
power battery
target temperature
refrigeration
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Pending
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CN202110267360.8A
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Chinese (zh)
Inventor
马向阳
汪跃中
陆训
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Chery New Energy Automobile Co Ltd
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Chery New Energy Automobile Co Ltd
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Priority to CN202110267360.8A priority Critical patent/CN112977158A/en
Publication of CN112977158A publication Critical patent/CN112977158A/en
Pending legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
    • B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
    • B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • 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
    • 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

Abstract

The application discloses electric automobile and heat management method and device thereof, a vehicle control unit and an electric automobile, wherein the method comprises the following steps: collecting a first actual temperature of a power battery of the electric automobile and a second actual temperature of a riding environment; comparing the difference between the first actual temperature and the first target temperature of the power battery and the difference between the second actual temperature and the second target temperature of the riding environment, and determining the switching strategies of the refrigeration equipment and the cooling loop; and controlling the refrigerating action of the refrigerating equipment according to a switching strategy so as to control the temperature of the power battery and/or the riding environment and control the refrigerating equipment and the cooling loop to carry out the heat convection of the cooling liquid and the refrigerant. Therefore, different control strategies can be carried out on the power battery and the riding cabin according to different differences of the actual temperature of the riding environment, the actual temperature of the battery and the target temperature, the battery is guaranteed to be effectively cooled, meanwhile, the thermal comfort of the riding cabin is considered, the energy consumption level of the whole automobile is reduced, and the performance of the electric automobile is improved.

Description

Electric automobile heat management method and device, vehicle control unit and electric automobile
Technical Field
The application relates to the technical field of electric automobiles, in particular to a heat management method and device of an electric automobile, a vehicle control unit and the electric automobile.
Background
At present, the power battery is used as a main power source of the electric automobile, and the performance of the power battery has a decisive effect on the endurance mileage of the electric automobile.
In the related art, the driving range of the electric vehicle is often increased by increasing the energy density of the power battery.
However, due to the improvement of the density of the power battery, the calorific value of the power battery is increased easily, and the temperature is high, so that the discharge characteristic of the power battery is affected, and the performance of the electric vehicle is reduced.
Content of application
The application provides a thermal management method and device for an electric automobile, a vehicle control unit and the electric automobile, which aim to solve the problems that the heating value of a power battery is increased easily due to the improvement of the density of the power battery, the temperature is higher, the discharge characteristic of the power battery is influenced, and the performance of the electric automobile is reduced.
An embodiment of a first aspect of the present application provides a thermal management method for an electric vehicle, including the following steps:
collecting a first actual temperature of a power battery of the electric automobile and a second actual temperature of a riding environment;
comparing the difference between the first actual temperature and a first target temperature of the power battery and the difference between the second actual temperature and a second target temperature of the riding environment, and determining a switching strategy of a refrigeration device and a cooling loop; and
and controlling the refrigeration action of the refrigeration equipment according to the switching strategy so as to control the temperature of the power battery and/or the riding environment and control the refrigeration equipment and the cooling loop to carry out the heat convection of cooling liquid and a refrigerant at the same time.
Optionally, the comparing the first actual temperature with the first target temperature of the power battery and the difference between the second actual temperature and the second target temperature of the riding environment to determine the switching strategy of the refrigeration equipment includes:
if the second actual temperature is less than or equal to the second target temperature and the first actual temperature is greater than the first target temperature, closing a refrigeration switch corresponding to the riding compartment and opening a refrigeration switch corresponding to the power battery;
if the second actual temperature is higher than the second target temperature and the first actual temperature is lower than or equal to the first target temperature, closing a refrigeration switch corresponding to the power battery and opening a refrigeration switch corresponding to the riding compartment;
and if the second actual temperature is less than or equal to the second target temperature and the first actual temperature is less than or equal to the first target temperature, closing the refrigeration switches corresponding to the power battery and the riding cabin.
Optionally, the determining the switching strategy of the refrigeration equipment and the cooling circuit comprises:
matching heat exchange requirements of the refrigeration equipment and the cooling loop according to the difference between the first actual temperature and a first target temperature of the power battery and the difference between the second actual temperature and a second target temperature of the riding environment;
and calculating the target opening of the exchange openings of the refrigeration equipment and the cooling loop according to the heat exchange requirement.
Optionally, the method further comprises:
simulating a whole vehicle control device of the electric vehicle to obtain a cooling demand generated by a driving motor under at least one driving working condition;
and correcting the switching strategy according to the cooling demand to obtain a final switching strategy.
An embodiment of a second aspect of the present application provides a thermal management device for an electric vehicle, including:
the acquisition module is used for acquiring a first actual temperature of a power battery of the electric automobile and a second actual temperature of a riding environment;
the determining module is used for comparing the difference between the first actual temperature and a first target temperature of the power battery and the difference between the second actual temperature and a second target temperature of the riding environment, and determining the switching strategies of the refrigeration equipment and the cooling loop; and
and the control module is used for controlling the refrigerating action of the refrigerating equipment according to the switching strategy so as to control the temperature of the power battery and/or the riding environment and control the refrigerating equipment and the cooling loop to carry out convective heat exchange of cooling liquid and a refrigerant.
Optionally, the determining module is specifically configured to:
if the second actual temperature is less than or equal to the second target temperature and the first actual temperature is greater than the first target temperature, closing a refrigeration switch corresponding to the riding compartment and opening a refrigeration switch corresponding to the power battery;
if the second actual temperature is higher than the second target temperature and the first actual temperature is lower than or equal to the first target temperature, closing a refrigeration switch corresponding to the power battery and opening a refrigeration switch corresponding to the riding compartment;
and if the second actual temperature is less than or equal to the second target temperature and the first actual temperature is less than or equal to the first target temperature, closing the refrigeration switches corresponding to the power battery and the riding cabin.
Optionally, the determining module is further configured to:
matching heat exchange requirements of the refrigeration equipment and the cooling loop according to the difference between the first actual temperature and a first target temperature of the power battery and the difference between the second actual temperature and a second target temperature of the riding environment;
and calculating the target opening of the exchange openings of the refrigeration equipment and the cooling loop according to the heat exchange requirement.
Optionally, the method further comprises:
the simulation module is used for simulating a whole vehicle control device of the electric vehicle to obtain a cooling demand generated by a driving motor under at least one driving working condition;
and the correction module is used for correcting the switching strategy according to the cooling requirement to obtain a final switching strategy.
According to a third aspect of the present application, an embodiment provides a vehicle control unit, which includes the above thermal management device for an electric vehicle.
An embodiment of a fourth aspect of the present application provides an electric vehicle, which includes the vehicle control unit described above.
From this, can carry out different control strategies to power battery and cabin by bus according to the difference of the actual temperature of environment, battery actual temperature and target temperature by bus, when guaranteeing that the battery obtains effective heat dissipation, compromise the thermal comfort in cabin by bus, energy-conserving effect is better moreover, reduces whole car energy consumption level, simultaneously the temperature range of reasonable effectual control power battery, the charge-discharge capacity of effectual control battery promotes electric automobile's performance greatly.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a thermal management method for an electric vehicle according to an embodiment of the present application;
FIG. 2 is a block diagram of an analog control device of an electric vehicle according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a power cell thermal management system according to an embodiment of the present application;
fig. 4 is an exemplary diagram of a thermal management device of an electric vehicle according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The following describes an electric vehicle, a vehicle control unit, and an electric vehicle, and a method and an apparatus for thermal management of an electric vehicle according to an embodiment of the present application with reference to the drawings. In the method, different control strategies can be carried out on the power battery and a riding cabin according to the difference between the actual temperature of a riding environment and the difference between the actual temperature of the battery and the target temperature, so that the battery is ensured to be effectively radiated, the thermal comfort of the riding cabin is considered, the energy-saving effect is better, the energy consumption level of the whole automobile is reduced, meanwhile, the temperature range of the power battery is reasonably and effectively controlled, the charging and discharging capacity of the battery is effectively controlled, and the performance of the electric automobile is greatly improved.
Specifically, fig. 1 is a schematic flowchart of a thermal management method of an electric vehicle according to an embodiment of the present application.
As shown in fig. 1, the method for thermal management of an electric vehicle includes the following steps:
in step S101, a first actual temperature of a power battery of the electric vehicle and a second actual temperature of a riding environment are collected.
Specifically, the second actual temperature of the riding environment may be a temperature of a riding cabin, and the first actual temperature of the power battery and the second actual temperature of the riding environment may be collected by a temperature sensor in the embodiment of the present application.
It should be noted that, the manner of acquiring the first actual temperature of the power battery of the electric vehicle and the second actual temperature of the riding environment by the temperature sensor is only an example, and is not a limitation to the present invention, and a person skilled in the art may adopt a corresponding acquisition manner according to actual situations, for example, acquire the second actual temperature of the riding environment by a thermometer, and is not limited specifically herein.
In step S102, the difference between the first actual temperature and the first target temperature and the second actual temperature of the power battery and the second target temperature of the riding environment are compared, and the switching strategies of the refrigeration equipment and the cooling circuit are determined.
The first target temperature and the second target temperature may be target temperatures preset by a user, target temperatures obtained through limited experiments, or target temperatures obtained through limited computer simulation.
It should be understood by those skilled in the art that when the first actual temperature is greater than the first target temperature, indicating that the temperature of the power battery is high, the power battery needs to be cooled, the cooling switch corresponding to the power battery may be turned on, and when the second actual temperature is greater than the second target temperature, indicating that the temperature of the passenger compartment is high, the passenger compartment needs to be cooled, and the cooling switch corresponding to the passenger compartment may be turned on.
Optionally, in some embodiments, when the second actual temperature is less than or equal to the second target temperature and the first actual temperature is greater than the first target temperature, the refrigeration switch corresponding to the riding compartment is turned off, and the refrigeration switch corresponding to the power battery is turned on, so as to effectively cool the power battery; when the second actual temperature is higher than the second target temperature and the first actual temperature is lower than or equal to the first target temperature, the refrigeration switch corresponding to the power battery is closed, and the refrigeration switch corresponding to the riding cabin is opened to effectively cool the passenger cabin; and when the second actual temperature is less than or equal to the second target temperature and the first actual temperature is less than or equal to the first target temperature, the refrigeration switches corresponding to the power battery and the riding cabin are both closed.
Further, in some embodiments, determining a switching strategy for the refrigeration equipment and the cooling circuit includes: matching heat exchange requirements of the refrigeration equipment and the cooling loop according to the difference between the first actual temperature and the first target temperature of the power battery, the difference between the second actual temperature and the second target temperature of the riding environment; and calculating the target opening of the exchange openings of the refrigeration equipment and the cooling loop according to the heat exchange requirement.
It can be understood that, in the embodiment of the present application, after the first actual temperature and the second actual temperature are obtained, the difference between the first actual temperature and the first target temperature, and the difference between the second actual temperature and the second target temperature, which can be calculated in the embodiment of the present application, may be obtained through a mapping relationship between the difference between the target temperature and the actual temperature and the heat exchange requirement, and the mapping relationship is queried, so as to match the heat exchange requirements of the refrigeration equipment and the cooling loop.
Further, after the heat exchange requirement is determined, the target opening degrees of the exchange opening degrees of the refrigeration equipment and the cooling circuit may be obtained by calculating through a corresponding calculation method, and the calculation method may adopt a calculation method in the related art, which is not specifically limited herein.
In step S103, the refrigeration operation of the refrigeration equipment is controlled according to the switching strategy, so as to control the temperature of the power battery and/or the riding environment, and at the same time, the refrigeration equipment and the cooling loop are controlled to perform heat convection of the coolant and the refrigerant.
That is to say, when the power battery needs to be cooled, the battery management system can send a cooling request, the power battery cooling water pump starts to operate, the air compressor starts to work at the same time, a refrigeration effect is generated, and in the heat exchanger, the refrigerant and the power battery cooling liquid perform heat convection so as to reduce the temperature of the power battery cooling liquid and play a role in cooling the power battery; when the passenger compartment needs to be cooled, the electronic expansion valve of the passenger compartment is opened, and the passenger compartment is effectively cooled through an Air Conditioning HVAC (Heating, Ventilation and Air Conditioning) unit, so that the energy consumption of the whole vehicle is reduced.
Optionally, in some embodiments, the method further comprises: simulating a whole vehicle control device of the electric vehicle to obtain a cooling demand generated by a driving motor under at least one driving working condition; and correcting the switching strategy according to the cooling requirement to obtain a final switching strategy.
For example, as shown in fig. 2, fig. 2 is a block diagram illustrating an analog control device of an electric vehicle according to an embodiment of the present disclosure. The simulation control device of the electric automobile comprises: the system comprises a passenger compartment simulation unit 1, an air conditioner simulation unit 2, a heat exchanger 3, a first power battery 4, a second power battery 5, a low-voltage storage battery 6, a low-voltage load 7, a battery management system 8, a motor controller 9, a motor 10, a radiator cooling system 11, a speed reducer 12, a Vehicle unit 13, a driving control unit 14 and a Vehicle Control Unit (VCU) 15.
Therefore, the actual running state of the whole vehicle road can be fully simulated through the simulation control device of the electric vehicle, effective analysis is carried out, the refrigeration demands of the passenger compartment and the power battery are distinguished, the cooling loop is effectively controlled through the whole vehicle control unit, and the energy consumption level of the whole vehicle is reduced while the cooling is achieved.
In order to enable those skilled in the art to further understand the thermal management method of the electric vehicle according to the embodiment of the present application, the following detailed description is provided with reference to fig. 2 and 3.
Specifically, as shown in fig. 3, fig. 3 is a schematic diagram of a power battery thermal management system. The power battery thermal management system mainly comprises: a condenser unit 16, a cooling fan unit 17, an air conditioner compressor unit 18, a heat exchanger 19, an electronic expansion valve 20- (1, 2, 3), a power battery unit 21, a water pump unit 22, and an air conditioner HVAC unit 23.
The following will describe in detail the respective cooling of the passenger compartment and the power battery by using corresponding control methods according to the difference result between the first actual temperature of the power battery and the first target temperature of the power battery, and the second actual temperature of the riding environment and the second target temperature of the riding environment.
(1) When the second actual temperature (Tcab) of the passenger cabin is greater than the passenger cabin target temperature (TcabTarget) and the first actual temperature of the power battery is greater than the target temperature (Tbatt Target) of the power battery, the power battery and the passenger cabin need to be cooled. Meanwhile, the air conditioning HVAC unit properly cools the riding cabin, and the energy consumption level of the whole vehicle is reduced from the perspective of integrated heat management control of the whole vehicle, so that the energy consumption is optimal.
(2) When the second actual temperature (Tcab) of the passenger cabin is less than or equal to the target temperature (TcabTarget) of the passenger cabin and the first actual temperature (Tbat) of the power battery is greater than the target temperature (Tbat target) of the power battery, the power battery needs to be cooled, logic control is carried out through a VCU, an electronic expansion valve (20-1) of the passenger cabin is cut off, one electronic expansion valve (20-2) of the power battery is started to only effectively cool the power battery, meanwhile, the electronic expansion valve (20-3) of a cooling liquid circulation loop of the power battery can be started at a proper angle according to the cooling requirement of the power battery, effective convection heat exchange of cooling liquid and a refrigerant is carried out, and the energy consumption of the whole vehicle is reduced.
(3) The second actual temperature (Tcab) of the passenger compartment is greater than the target temperature (TcabTarget) of the passenger compartment, the first actual temperature (Tbat) of the power battery is less than or equal to the target temperature (TbatTarget) of the power battery, the passenger compartment needs to be cooled at the moment, the electronic expansion valve (20-1) of the passenger compartment is opened, one electronic expansion valve (20-2) of the power battery is cut off, logic control is carried out through a VCU, one electronic expansion valve (20-2) of the power battery is cut off, the passenger compartment is effectively cooled only through an air-conditioning HVAC unit, and the energy consumption of the whole vehicle is reduced.
(4) When the second actual temperature (Tcab) of the passenger compartment is less than or equal to the target temperature (TcabTarget) of the passenger compartment and the first actual temperature (Tbat) of the power battery is less than or equal to the target temperature (TbatTarget) of the power battery, the passenger compartment and the power battery have no refrigeration requirement, logic control is carried out through the VCU, and the electronic expansion valves (20-1, 2 and 3) are not opened.
(5) The heat management of the power battery realizes effective heat dissipation of cooling requirements generated by the motor under different driving conditions through a motor controller 9, the motor 10 and a radiator cooling system 11 in an analog control device of the electric automobile.
According to the electric automobile heat management method provided by the embodiment of the application, different control strategies can be carried out on the power battery and the riding cabin according to the difference between the actual temperature of the riding environment and the difference between the actual temperature of the battery and the target temperature, the effective heat dissipation of the battery is guaranteed, the thermal comfort of the riding cabin is considered, the energy-saving effect is good, the energy consumption level of the whole automobile is reduced, meanwhile, the temperature range of the power battery is reasonably and effectively controlled, the charging and discharging capacity of the battery is effectively controlled, and the performance of the electric automobile is greatly improved.
Next, a thermal management device for an electric vehicle according to an embodiment of the present application will be described with reference to the drawings.
Fig. 4 is a block diagram illustrating a thermal management device of an electric vehicle according to an embodiment of the present application.
As shown in fig. 4, the thermal management apparatus 1000 of the electric vehicle includes: an acquisition module 100, a determination module 200 and a control module 300.
The acquisition module 100 is configured to acquire a first actual temperature of a power battery of the electric vehicle and a second actual temperature of a riding environment;
the determining module 200 is used for comparing the difference between the first actual temperature and the first target temperature of the power battery, the difference between the second actual temperature and the second target temperature of the riding environment, and determining the switching strategies of the refrigeration equipment and the cooling loop; and
the control module 300 is configured to control a refrigeration action of the refrigeration apparatus according to a switching strategy, so as to control the temperature of the power battery and/or the riding environment and control the refrigeration apparatus and the cooling loop to perform heat convection of the cooling liquid and the refrigerant.
Optionally, in some embodiments, the determining module 200 is specifically configured to:
if the second actual temperature is less than or equal to the second target temperature and the first actual temperature is greater than the first target temperature, closing a refrigeration switch corresponding to the riding compartment and opening a refrigeration switch corresponding to the power battery;
if the second actual temperature is higher than the second target temperature and the first actual temperature is lower than or equal to the first target temperature, closing a refrigeration switch corresponding to the power battery and opening a refrigeration switch corresponding to the riding cabin;
and if the second actual temperature is less than or equal to the second target temperature and the first actual temperature is less than or equal to the first target temperature, the refrigeration switches corresponding to the power battery and the riding cabin are both closed.
Optionally, in some embodiments, the determining module 200 is further configured to:
matching heat exchange requirements of the refrigeration equipment and the cooling loop according to the difference between the first actual temperature and the first target temperature of the power battery, the difference between the second actual temperature and the second target temperature of the riding environment;
and calculating the target opening of the exchange openings of the refrigeration equipment and the cooling loop according to the heat exchange requirement.
Optionally, in some embodiments, the thermal management apparatus 1000 of an electric vehicle further includes:
the simulation module is used for simulating a whole vehicle control device of the electric vehicle to obtain a cooling demand generated by the driving motor under at least one driving working condition;
and the correction module is used for correcting the switching strategy according to the cooling requirement to obtain a final switching strategy.
It should be noted that the foregoing explanation on the embodiment of the thermal management method for the electric vehicle is also applicable to the thermal management device for the electric vehicle in this embodiment, and details are not repeated here.
According to the electric automobile's that this application embodiment provided thermal management device, can carry out different control strategy to power battery and cabin by bus according to the difference of the actual temperature of environment by bus, battery actual temperature and target temperature, when guaranteeing that the battery obtains effective heat dissipation, compromise the thermal comfort of cabin by bus, and energy-conserving effect is better in addition, reduce whole car energy consumption level, simultaneously the temperature range of reasonable effectual control power battery, the charge-discharge capacity of effectual control battery, promote electric automobile's performance greatly.
In addition, the embodiment of the application also provides a vehicle control unit, and the system comprises the thermal management device of the electric vehicle.
According to the vehicle control unit that this application embodiment provided, through foretell electric automobile's thermal management device, can carry out different control strategy to power battery and cabin by bus according to the difference of the actual temperature of environment by bus, battery actual temperature and target temperature, when guaranteeing that the battery obtains effective heat dissipation, compromise the thermal comfort in cabin by bus, and energy-conserving effect is better moreover, reduce whole car energy consumption level, simultaneously the temperature range of reasonable effectual control power battery, the charge-discharge capacity of effectual control battery, promote electric automobile's performance greatly.
In addition, the embodiment of the application also provides an electric automobile which comprises the vehicle control unit.
According to the vehicle control unit that this application embodiment provided, through foretell vehicle control unit, can carry out different control strategy to power battery and cabin by bus according to the difference of the actual temperature of environment by bus, battery actual temperature and target temperature, when guaranteeing that the battery obtains effective heat dissipation, compromise the thermal comfort in cabin by bus, energy-conserving effect is better moreover, reduce whole car energy consumption level, simultaneously the temperature range of reasonable effectual control power battery, the charge-discharge capacity of effectual control battery, promote electric automobile's performance greatly.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
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 application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.

Claims (10)

1. The method for thermally managing the electric automobile is characterized by comprising the following steps of:
collecting a first actual temperature of a power battery of the electric automobile and a second actual temperature of a riding environment;
comparing the difference between the first actual temperature and a first target temperature of the power battery and the difference between the second actual temperature and a second target temperature of the riding environment, and determining a switching strategy of a refrigeration device and a cooling loop; and
and controlling the refrigeration action of the refrigeration equipment according to the switching strategy so as to control the temperature of the power battery and/or the riding environment and control the refrigeration equipment and the cooling loop to carry out the heat convection of cooling liquid and a refrigerant at the same time.
2. The method of claim 1, wherein comparing the first actual temperature to a difference between the first target temperature of the power cell and the second actual temperature to a second target temperature of the ride environment to determine a switching strategy for a refrigeration unit comprises:
if the second actual temperature is less than or equal to the second target temperature and the first actual temperature is greater than the first target temperature, closing a refrigeration switch corresponding to the riding compartment and opening a refrigeration switch corresponding to the power battery;
if the second actual temperature is higher than the second target temperature and the first actual temperature is lower than or equal to the first target temperature, closing a refrigeration switch corresponding to the power battery and opening a refrigeration switch corresponding to the riding compartment;
and if the second actual temperature is less than or equal to the second target temperature and the first actual temperature is less than or equal to the first target temperature, closing the refrigeration switches corresponding to the power battery and the riding cabin.
3. The method according to claims 1 and 2, wherein the determining of the switching strategy of the refrigeration equipment and the cooling circuit comprises:
matching heat exchange requirements of the refrigeration equipment and the cooling loop according to the difference between the first actual temperature and a first target temperature of the power battery and the difference between the second actual temperature and a second target temperature of the riding environment;
and calculating the target opening of the exchange openings of the refrigeration equipment and the cooling loop according to the heat exchange requirement.
4. The method of claim 1, further comprising:
simulating a whole vehicle control device of the electric vehicle to obtain a cooling demand generated by a driving motor under at least one driving working condition;
and correcting the switching strategy according to the cooling demand to obtain a final switching strategy.
5. A thermal management device for an electric vehicle, comprising:
the acquisition module is used for acquiring a first actual temperature of a power battery of the electric automobile and a second actual temperature of a riding environment;
the determining module is used for comparing the difference between the first actual temperature and a first target temperature of the power battery and the difference between the second actual temperature and a second target temperature of the riding environment, and determining the switching strategies of the refrigeration equipment and the cooling loop; and
and the control module is used for controlling the refrigerating action of the refrigerating equipment according to the switching strategy so as to control the temperature of the power battery and/or the riding environment and control the refrigerating equipment and the cooling loop to carry out convective heat exchange of cooling liquid and a refrigerant.
6. The apparatus of claim 5, wherein the determining module is specifically configured to:
if the second actual temperature is less than or equal to the second target temperature and the first actual temperature is greater than the first target temperature, closing a refrigeration switch corresponding to the riding compartment and opening a refrigeration switch corresponding to the power battery;
if the second actual temperature is higher than the second target temperature and the first actual temperature is lower than or equal to the first target temperature, closing a refrigeration switch corresponding to the power battery and opening a refrigeration switch corresponding to the riding compartment;
and if the second actual temperature is less than or equal to the second target temperature and the first actual temperature is less than or equal to the first target temperature, closing the refrigeration switches corresponding to the power battery and the riding cabin.
7. The apparatus of claims 5 and 6, wherein the determining module is further configured to:
matching heat exchange requirements of the refrigeration equipment and the cooling loop according to the difference between the first actual temperature and a first target temperature of the power battery and the difference between the second actual temperature and a second target temperature of the riding environment;
and calculating the target opening of the exchange openings of the refrigeration equipment and the cooling loop according to the heat exchange requirement.
8. The apparatus of claim 5, further comprising:
the simulation module is used for simulating a whole vehicle control device of the electric vehicle to obtain a cooling demand generated by a driving motor under at least one driving working condition;
and the correction module is used for correcting the switching strategy according to the cooling requirement to obtain a final switching strategy.
9. A vehicle control unit, comprising: the thermal management device for electric vehicles according to any one of claims 5 to 8.
10. An electric vehicle, comprising: the vehicle control unit of claim 9.
CN202110267360.8A 2021-03-11 2021-03-11 Electric automobile heat management method and device, vehicle control unit and electric automobile Pending CN112977158A (en)

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