CN112977157A - Heat management method and device of power battery, vehicle control unit and electric vehicle - Google Patents
Heat management method and device of power battery, vehicle control unit and electric vehicle Download PDFInfo
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- CN112977157A CN112977157A CN202110265573.7A CN202110265573A CN112977157A CN 112977157 A CN112977157 A CN 112977157A CN 202110265573 A CN202110265573 A CN 202110265573A CN 112977157 A CN112977157 A CN 112977157A
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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
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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
- B60L58/26—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
- 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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- 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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Abstract
The application discloses a power battery thermal management method and device, a vehicle control unit and an electric vehicle, wherein the method comprises the following steps: detecting the actual temperature of a vehicle power battery; when the actual temperature is detected to be higher than the first preset temperature, a refrigeration switch of the vehicle-mounted air conditioner is turned on, so that the actual temperature of the power battery is reduced to the first preset temperature by the vehicle-mounted air conditioner; and when the actual temperature is lower than the second preset temperature, a heating switch of the heating device is turned on, so that the actual temperature of the power battery is increased to the second preset temperature by the heating device, wherein the first preset temperature is higher than the second preset temperature. Therefore, the temperature of the power battery is effectively controlled in a high-temperature environment or a low-temperature environment, the charging and discharging performance and the safety performance of the power battery are greatly improved, the vehicle using feeling of a user is effectively improved, and the driving range of a vehicle is increased.
Description
Technical Field
The application relates to the technical field of electric vehicles, in particular to a power battery thermal management method and device, a vehicle control unit and an electric vehicle.
Background
At present, electric vehicles are limited by the development bottleneck of the battery industry, and under extreme conditions, such as high temperature and high cold environments, the charging capacity and the discharging capacity of a power battery are obviously reduced.
However, the temperature is too high, the power battery is flammable, the temperature is too low, the endurance mileage is greatly influenced, and the discharge performance of the power battery is reduced under the high-temperature environment or the low-temperature environment, so that the driving feeling of the vehicle is influenced, and a solution is urgently needed.
Content of application
The application provides a power battery thermal management method and device, a vehicle control unit and an electric vehicle, and solves the problem that in the related art, the discharging performance of a power battery is reduced due to the high-temperature environment or the low-temperature environment, so that the driving feeling of the vehicle is influenced.
An embodiment of a first aspect of the present application provides a thermal management method for a power battery, including the following steps:
detecting the actual temperature of a vehicle power battery;
when the actual temperature is detected to be higher than a first preset temperature, a refrigeration switch of a vehicle-mounted air conditioner is turned on, so that the actual temperature of the power battery is reduced to the first preset temperature by the vehicle-mounted air conditioner; and
when the actual temperature is lower than a second preset temperature, a heating switch of heating equipment is turned on, so that the actual temperature of the power battery is increased to the second preset temperature by the heating equipment, wherein the first preset temperature is higher than the second preset temperature.
Optionally, the causing the vehicle air conditioner to reduce the actual temperature of the power battery to the first preset temperature includes:
calculating the current refrigeration demand of the power battery according to the difference value between the actual temperature and the first preset temperature;
and acquiring the target opening degree of the refrigeration switch and/or the target rotating speed of the compressor according to the current refrigeration demand.
Optionally, the turning on the refrigeration switch of the vehicle air conditioner includes:
judging the current state of the refrigeration equipment;
if the current state is the closed state, controlling the first sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor;
and if the current state is an open state, controlling the first sub-switch and the second sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor and the current cooling demand of the vehicle.
Optionally, the causing the heating device to increase the actual temperature of the power battery to the second preset temperature includes:
calculating the current heating requirement of the power battery according to the difference value between the actual temperature and the second preset temperature;
when the current heating requirement meets the heating condition, the heating switch is turned on, and meanwhile, the vehicle-mounted storage battery is controlled to supply power to the heating equipment.
Optionally, before detecting the actual temperature of the power battery, the method further includes:
detecting the current temperature of the environment where the vehicle is located and the current working condition of the vehicle;
when the current temperature is detected to be greater than a first preset threshold value and the current working condition is in a power-on state or an extrapolation charging working condition, controlling the vehicle to enter a battery cooling mode;
and when the current temperature is detected to be lower than a second preset threshold value and the current working condition is in a non-extrapolation charging and power-on working condition or an extrapolation charging and power-on or power-off working condition, controlling the vehicle to enter a battery heating mode, wherein the first preset threshold value is larger than the second preset threshold value.
An embodiment of the second aspect of the present application provides a thermal management device for a power battery, including:
the detection module is used for detecting the actual temperature of the vehicle power battery;
the first control module is used for turning on a refrigeration switch of a vehicle-mounted air conditioner when the fact that the actual temperature is higher than a first preset temperature is detected, so that the vehicle-mounted air conditioner can reduce the actual temperature of the power battery to the first preset temperature; and
and the second control module is used for turning on a heating switch of the heating equipment when the actual temperature is detected to be lower than a second preset temperature, so that the actual temperature of the power battery is increased to the second preset temperature by the heating equipment, wherein the first preset temperature is higher than the second preset temperature.
Optionally, the first control module includes:
the first calculation unit is used for calculating the current refrigeration demand of the power battery according to the difference value between the actual temperature and the first preset temperature;
and the second acquisition unit is used for acquiring the target opening of the refrigeration switch and/or the target rotating speed of the compressor according to the current refrigeration demand.
Optionally, the first control module includes:
the judging unit is used for judging the current state of the refrigeration equipment;
the first control unit is used for controlling the first sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor when the current state is the closing state;
and the second control unit is used for controlling the first sub-switch and the second sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor and the current cooling demand of the vehicle when the current state is the opening state.
Optionally, the second control module includes:
the second calculation unit is used for calculating the current heating requirement of the power battery according to the difference value between the actual temperature and the second preset temperature;
and the third control unit is used for controlling the vehicle-mounted storage battery to supply power to the heating equipment while opening the heating switch when the current heating requirement meets the heating condition.
Optionally, before detecting the actual temperature of the power battery, the detection module further includes:
the detection unit is used for detecting the current temperature of the environment where the vehicle is located and the current working condition of the vehicle;
the fourth control unit is used for controlling the vehicle to enter a battery cooling mode when the current temperature is detected to be greater than a first preset threshold value and the current working condition is in a power-on state or an extrapolation charging working condition;
and the fifth control unit is used for controlling the vehicle to enter a battery heating mode when the current temperature is detected to be lower than a second preset threshold value and the current working condition is a non-extrapolation charging and power-on working condition or an extrapolation charging and power-on or power-off working condition, wherein the first preset threshold value is larger than the second preset threshold value.
According to a third aspect of the application, the vehicle control unit comprises the thermal management device for the power battery.
An embodiment of a fourth aspect of the present application provides an electric vehicle, which includes the vehicle control unit.
Therefore, when the actual temperature of the power battery of the vehicle is higher than a certain temperature, the refrigeration switch of the vehicle-mounted air conditioner is turned on, so that the actual temperature of the power battery is reduced to the certain temperature by the vehicle-mounted air conditioner, and when the actual temperature is lower than the certain value, the heating switch of the heating device is turned on, so that the actual temperature of the power battery is increased to the certain temperature by the heating device, the problem that the discharge performance of the power battery is reduced due to the high-temperature environment or the low-temperature environment in the related art, and the driving feeling of the vehicle is influenced is solved, the effective control on the temperature of the power battery in the high-temperature environment or the low-temperature environment is realized, the charge and discharge performance and the safety performance of the power battery are greatly improved, the vehicle using feeling of a user is effectively improved.
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 a power battery according to an embodiment of the present application;
FIG. 2 is a block diagram illustration of a thermal management system for a power cell according to an embodiment of the present application;
fig. 3 is a block diagram illustrating an example of a thermal management device for a power battery according to an embodiment of the present disclosure.
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 a method and a device for thermal management of a power battery, a vehicle control unit and an electric vehicle according to an embodiment of the present application with reference to the drawings. Aiming at the problems that the temperature is overhigh, the power battery is inflammable, the temperature is too low, the driving mileage can be greatly influenced, and the reduction of the discharge performance of the power battery can directly influence the driving feeling of a vehicle, the application provides a heat management method of the power battery, when the actual temperature of the power battery of the vehicle is detected to be higher than a certain temperature, a refrigeration switch of a vehicle-mounted air conditioner is turned on to enable the vehicle-mounted air conditioner to reduce the actual temperature of the power battery to a certain temperature, and when the actual temperature is detected to be lower than a certain value, a heating switch of heating equipment is turned on to enable the heating equipment to increase the actual temperature of the power battery to a certain temperature, so that the problem that the discharge performance of the power battery is reduced due to the high-temperature environment or the low-temperature environment in the related technology and the driving feeling of the vehicle is influenced is solved, and the driving feeling of the, the temperature of the power battery is effectively controlled, the charging and discharging performance and the safety performance of the power battery are greatly improved, the vehicle using experience of a user is effectively improved, and the driving range of a vehicle is increased.
Specifically, fig. 1 is a schematic flow chart of a thermal management method for a power battery according to an embodiment of the present application.
As shown in fig. 1, the thermal management method of the power battery includes the following steps:
in step S101, the actual temperature of the vehicle power battery is detected.
It is understood that the embodiment of the present application may be used to obtain the actual temperature of the power BATTERY of the vehicle through a BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS).
It should be noted that the battery management system CAN collect the temperature of the power battery, determine the refrigeration request, the rotation speed of the compressor, and the heating request, and send the request to the vehicle Controller through a Controller Area Network (CAN) signal; the vehicle control unit can control a refrigerant relay, a heating circuit relay, the rotating speed of the compressor and the like according to a request sent by the battery management system; collecting the voltage of a vehicle-mounted storage battery, judging and controlling the enabling of a vehicle-mounted inverter, and controlling the output voltage of the vehicle-mounted inverter during enabling;
optionally, in some embodiments, before detecting the actual temperature of the power battery, the method further includes: detecting the current temperature of the environment where the vehicle is located and the current working condition of the vehicle; when the current temperature is detected to be greater than a first preset threshold value and the current working condition is in a power-on state or an extrapolation charging working condition, controlling the vehicle to enter a battery refrigeration mode; and when the current temperature is detected to be lower than a second preset threshold value, and the current working condition is in a non-extrapolation charging and power-on working condition, or an extrapolation charging and power-on or power-off working condition, controlling the vehicle to enter a battery heating mode, wherein the first preset threshold value is larger than the second preset threshold value.
The first preset threshold and the second preset threshold may be thresholds preset by a user, thresholds obtained through limited experiments, or thresholds obtained through limited computer simulation.
Specifically, the embodiment of the application can acquire the current temperature of the environment where the vehicle is located, if the current temperature is greater than a first preset threshold value, the environment where the vehicle is located is a high-temperature environment, and if the vehicle is in a power-on state or an extrapolation charging working condition (power-on or power-off of the vehicle) at the moment, the vehicle can be controlled to enter a battery cooling mode; if the current temperature is smaller than a second preset threshold value, the environment of the vehicle is a low-temperature environment, and if the vehicle is in the non-extrapolation charging and power-on working condition at the moment, or the extrapolation charging and power-on or power-off working condition at the moment, the vehicle can be controlled to enter a battery heating mode.
In step S102, when it is detected that the actual temperature is higher than the first preset temperature, a cooling switch of the vehicle air conditioner is turned on, so that the vehicle air conditioner reduces the actual temperature of the power battery to the first preset temperature.
Optionally, in some embodiments, turning on a cooling switch of the vehicle air conditioner includes: judging the current state of the refrigeration equipment; if the current state is the closing state, controlling the first sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor; and if the current state is an open state, controlling the first sub-switch and the second sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor and the current cooling demand of the vehicle.
This is explained in detail below with reference to fig. 2.
As shown in fig. 2, the power battery cooling system is connected in parallel with the vehicle refrigeration loop, shares a compressor, controls the flow direction of a refrigerant by controlling a refrigerant electromagnetic valve, and controls the air conditioner AC to be manually turned on by a user in the vehicle refrigeration requirement, i.e., controls the current state of the refrigeration equipment to be an on state, the power battery cooling is automatically controlled by a controller, the BMS detects the temperature of the power battery, meets the condition to send the refrigeration requirement to the vehicle controller, and the vehicle controller controls the refrigerant electromagnetic valve to be turned on and off and the rotation speed of the compressor according to the refrigeration requirement;
the power battery can heat and adopt the automatic control formula electrothermal film (PTC), and battery management system detects the power battery Temperature, satisfies the condition and sends the heating request for vehicle control unit, and vehicle control unit opens or closes heating circuit relay according to having or not of heating request, and the automatic control formula electrothermal film is supplied power by on-vehicle battery (lithium cell), reduces power battery energy consumption, promotes the vehicle and continues to travel the mileage.
Specifically, as shown in fig. 2, the first sub-switch may be a refrigerant solenoid valve 1, and the second sub-switch may be a refrigerant solenoid valve 2. The method comprises the steps that the current state of the refrigeration equipment can be obtained, and if the current state of the refrigeration equipment is in a closed state, the first sub-switch and the compressor are controlled to work, wherein the compressor can be controlled to work according to a power battery cooling request and a compressor rotating speed request; and if the current state of the refrigeration equipment is an on state, controlling the first sub-switch and the second sub-switch to be opened, and comprehensively calculating the rotating speed of the compressor according to the current cooling demand of the passenger compartment (vehicle) and the rotating speed request of the compressor sent by the battery management system. It should be noted that, if the battery management system does not receive the cooling request, and the current state of the refrigeration equipment is the on state, only the second sub-switch is controlled to be turned on, and the rotation speed of the compressor is calculated and controlled according to the current cooling demand of the vehicle.
Optionally, the causing the vehicle-mounted air conditioner to reduce the actual temperature of the power battery to a first preset temperature includes: calculating the current refrigeration demand of the power battery according to the difference value between the actual temperature and the first preset temperature; and acquiring the target opening degree of the refrigeration switch and/or the target rotating speed of the compressor according to the current refrigeration demand.
It can be understood that, in a high-temperature environment, when the actual temperature of the power battery is higher than a certain value, that is, the first preset temperature, the cooling request may be sent to the vehicle control unit, and the rotational speed of the compressor is calculated according to the difference between the actual temperature of the power battery and the first preset temperature, where the larger the difference is, the higher the calculated rotational speed of the compressor is, so as to send the calculated target rotational speed of the compressor to the vehicle control unit, so as to reduce the actual temperature of the power battery to the first preset temperature.
In step S103, when it is detected that the actual temperature is lower than a second preset temperature, a heating switch of the heating device is turned on, so that the heating device raises the actual temperature of the power battery to the second preset temperature, wherein the first preset temperature is higher than the second preset temperature.
Optionally, in some embodiments, causing the heating device to increase the actual temperature of the power battery to a second preset temperature includes: calculating the current heating requirement of the power battery according to the difference value between the actual temperature and the second preset temperature; when the current heating demand meets the heating condition, the heating switch is turned on, and meanwhile, the vehicle-mounted storage battery is controlled to supply power to the heating equipment.
As a possible implementation manner, in a low-temperature environment, when the vehicle is not externally plugged for charging and is in a power-on state, if the actual temperature of the power battery collected by the battery management system is lower than a certain value a1, that is, a second preset temperature, a heating request may be sent to the vehicle control unit, the vehicle control unit may control the heating circuit low-voltage relay to be closed, and when the temperature of the power battery reaches a certain value b1, the cooling request is 0, and the vehicle control unit controls the heating circuit low-voltage relay to be open.
As another possible implementation manner, in a low-temperature environment, when the vehicle is subjected to external plug-in charging (direct current or alternating current charging) and is in a power-on or power-off state, if the actual temperature of the power battery collected by the battery management system is lower than a certain value a2, a heating request may be sent to the vehicle control unit, the vehicle control unit may control the heating circuit low-voltage relay to be closed, and when the temperature of the power battery reaches a certain value b2, the cooling request is 0, and the vehicle control unit controls the heating circuit low-voltage relay to be opened.
Note that a1, a2, b1 and b2 are all calibrated quantities, and a1 < a2 and b1 < b2, namely, the temperature of the power battery is heated higher earlier when the heating circuit relay is closed in the charging state. The reason is mainly considered energy consumption when the vehicle runs and natural temperature rise of the power battery in the discharging process of the power battery.
In addition, when the vehicle is not charged externally, if the voltage of the vehicle-mounted storage battery (adopting a lithium battery, the capacity is larger) is higher than a certain value, the battery heating circuit is powered by the vehicle-mounted storage battery, and when the voltage of the vehicle-mounted storage battery is lower than the certain value, the vehicle control unit controls a Direct Current (DC) converter to work, such as converting high-voltage DC into low-voltage DC, and controlling the output voltage of the DC converter to be a certain value, and the heating circuit is mainly powered by the DC converter;
when the vehicle is charged in an external plug mode, the vehicle control unit controls the DCDC to work and controls the output voltage of the DCDC to be the highest design voltage of the vehicle-mounted storage battery, the heating circuit is mainly powered by the DCDC, and meanwhile the vehicle-mounted storage battery is charged.
According to the heat management method for the power battery, when the fact that the actual temperature of the power battery of the vehicle is higher than a certain temperature is detected, the refrigeration switch of the vehicle-mounted air conditioner is turned on, so that the actual temperature of the power battery is reduced to the certain temperature by the vehicle-mounted air conditioner, and when the fact that the actual temperature is lower than a certain value is detected, the heating switch of the heating device is turned on, so that the actual temperature of the power battery is increased to the certain temperature by the heating device.
Next, a thermal management device for a power battery according to an embodiment of the present application will be described with reference to the drawings.
Fig. 3 is a block schematic diagram of a thermal management device of a power battery according to an embodiment of the present application.
As shown in fig. 3, the thermal management device 10 for a power battery includes: a detection module 100, a first control module 200, and a second control module 300.
The detection module 100 is used for detecting the actual temperature of the vehicle power battery;
the first control module 200 is configured to, when detecting that the actual temperature is higher than a first preset temperature, turn on a refrigeration switch of the vehicle-mounted air conditioner, so that the vehicle-mounted air conditioner reduces the actual temperature of the power battery to the first preset temperature; and
the second control module 300 is configured to, when detecting that the actual temperature is lower than a second preset temperature, turn on a heating switch of the heating device, so that the heating device increases the actual temperature of the power battery to the second preset temperature, where the first preset temperature is higher than the second preset temperature.
Optionally, the first control module 200 comprises:
the first calculation unit is used for calculating the current refrigeration demand of the power battery according to the difference value between the actual temperature and the first preset temperature;
and the second acquisition unit is used for acquiring the target opening of the refrigeration switch and/or the target rotating speed of the compressor according to the current refrigeration demand.
Optionally, the first control module 200 comprises:
the judging unit is used for judging the current state of the refrigeration equipment;
the first control unit is used for controlling the first sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor when the current state is the closing state;
and the second control unit is used for controlling the first sub-switch and the second sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor and the current cooling demand of the vehicle when the current state is the opening state.
Optionally, the second control module 300 comprises:
the second calculation unit is used for calculating the current heating requirement of the power battery according to the difference value between the actual temperature and the second preset temperature;
and the third control unit is used for controlling the vehicle-mounted storage battery to supply power to the heating equipment while turning on the heating switch when the current heating requirement meets the heating condition.
Optionally, before detecting the actual temperature of the power battery, the detection module 100 further includes:
the detection unit is used for detecting the current temperature of the environment where the vehicle is located and the current working condition of the vehicle;
the fourth control unit is used for controlling the vehicle to enter a battery refrigeration mode when the current temperature is detected to be greater than the first preset threshold value and the current working condition is in a power-on state or an extrapolation charging working condition;
and the fifth control unit is used for controlling the vehicle to enter a battery heating mode when the current temperature is detected to be lower than a second preset threshold value, and the current working condition is a non-extrapolation charging and electrifying working condition, or an extrapolation charging and electrifying or powering-off working condition, wherein the first preset threshold value is larger than the second preset threshold value.
It should be noted that the foregoing explanation on the embodiment of the thermal management method for a power battery is also applicable to the thermal management device for a power battery of this embodiment, and details are not repeated here.
According to the thermal management device for the power battery, when the fact that the actual temperature of the power battery of the vehicle is higher than a certain temperature is detected, the refrigeration switch of the vehicle-mounted air conditioner is turned on, so that the actual temperature of the power battery is reduced to the certain temperature by the vehicle-mounted air conditioner, and when the fact that the actual temperature is lower than a certain value is detected, the heating switch of the heating device is turned on, so that the actual temperature of the power battery is increased to the certain temperature by the heating device, the problem that the discharging performance of the power battery is reduced due to the high-temperature environment or the low-temperature environment in the related art, and the driving feeling of the vehicle is affected is solved.
In addition, the embodiment of the application also provides a vehicle control unit, and the system comprises the thermal management device of the power battery.
According to the vehicle control unit provided by the embodiment of the application, through the thermal management device of the power battery, the refrigeration switch of the vehicle-mounted air conditioner can be turned on when the actual temperature of the vehicle power battery is detected to be higher than a certain temperature, so that the vehicle-mounted air conditioner can reduce the actual temperature of the power battery to a certain temperature, and when the actual temperature is detected to be lower than a certain value, a heating switch of the heating equipment is turned on, so that the heating device can raise the actual temperature of the power battery to a certain temperature, the problem that the driving feeling of the vehicle is influenced because the discharge performance of the power battery is reduced due to the high-temperature environment or the low-temperature environment in the related technology is solved, and the purpose that under the high-temperature environment or the low-temperature environment, the temperature of the power battery is effectively controlled, the charging and discharging performance and the safety performance of the power battery are greatly improved, the vehicle using experience of a user is effectively improved, and the driving range of a vehicle is increased.
In addition, the embodiment of the application also provides an electric vehicle, and the electric vehicle comprises the vehicle control unit.
According to the vehicle provided by the embodiment of the application, the vehicle control unit can turn on a refrigeration switch of the vehicle-mounted air conditioner when the actual temperature of the vehicle power battery is detected to be higher than a certain temperature, so that the vehicle-mounted air conditioner can reduce the actual temperature of the power battery to a certain temperature, and when the actual temperature is detected to be lower than a certain value, a heating switch of the heating equipment is turned on, so that the heating device can raise the actual temperature of the power battery to a certain temperature, the problem that the driving feeling of the vehicle is influenced because the discharge performance of the power battery is reduced due to the high-temperature environment or the low-temperature environment in the related technology is solved, and the purpose that under the high-temperature environment or the low-temperature environment, the temperature of the power battery is effectively controlled, the charging and discharging performance and the safety performance of the power battery are greatly improved, the vehicle using experience of a user is effectively improved, and the driving range of a vehicle is increased.
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.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
Claims (10)
1. The thermal management method of the power battery is characterized by comprising the following steps:
detecting the actual temperature of a vehicle power battery;
when the actual temperature is detected to be higher than a first preset temperature, a refrigeration switch of a vehicle-mounted air conditioner is turned on, so that the actual temperature of the power battery is reduced to the first preset temperature by the vehicle-mounted air conditioner; and
when the actual temperature is lower than a second preset temperature, a heating switch of heating equipment is turned on, so that the actual temperature of the power battery is increased to the second preset temperature by the heating equipment, wherein the first preset temperature is higher than the second preset temperature.
2. The method of claim 1, wherein the causing the on-board air conditioner to reduce the actual temperature of the power battery to the first preset temperature comprises:
calculating the current refrigeration demand of the power battery according to the difference value between the actual temperature and the first preset temperature;
and acquiring the target opening degree of the refrigeration switch and/or the target rotating speed of the compressor according to the current refrigeration demand.
3. The method of claim 2, wherein turning on a cooling switch of an on-board air conditioner comprises:
judging the current state of the refrigeration equipment;
if the current state is the closed state, controlling the first sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor;
and if the current state is an open state, controlling the first sub-switch and the second sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor and the current cooling demand of the vehicle.
4. The method of claim 1, wherein said causing the heating device to increase the actual temperature of the power cell to the second preset temperature comprises:
calculating the current heating requirement of the power battery according to the difference value between the actual temperature and the second preset temperature;
when the current heating requirement meets the heating condition, the heating switch is turned on, and meanwhile, the vehicle-mounted storage battery is controlled to supply power to the heating equipment.
5. The method of claim 1, further comprising, prior to detecting the actual temperature of the power cell:
detecting the current temperature of the environment where the vehicle is located and the current working condition of the vehicle;
when the current temperature is detected to be greater than a first preset threshold value and the current working condition is in a power-on state or an extrapolation charging working condition, controlling the vehicle to enter a battery cooling mode;
and when the current temperature is detected to be lower than a second preset threshold value and the current working condition is in a non-extrapolation charging and power-on working condition or an extrapolation charging and power-on or power-off working condition, controlling the vehicle to enter a battery heating mode, wherein the first preset threshold value is larger than the second preset threshold value.
6. A thermal management device for a power battery, comprising:
the detection module is used for detecting the actual temperature of the vehicle power battery;
the first control module is used for turning on a refrigeration switch of a vehicle-mounted air conditioner when the fact that the actual temperature is higher than a first preset temperature is detected, so that the vehicle-mounted air conditioner can reduce the actual temperature of the power battery to the first preset temperature; and
and the second control module is used for turning on a heating switch of the heating equipment when the actual temperature is detected to be lower than a second preset temperature, so that the actual temperature of the power battery is increased to the second preset temperature by the heating equipment, wherein the first preset temperature is higher than the second preset temperature.
7. The apparatus of claim 6, wherein the first control module comprises:
the first calculation unit is used for calculating the current refrigeration demand of the power battery according to the difference value between the actual temperature and the first preset temperature;
and the second acquisition unit is used for acquiring the target opening of the refrigeration switch and/or the target rotating speed of the compressor according to the current refrigeration demand.
8. The apparatus of claim 7, wherein the first control module comprises:
the judging unit is used for judging the current state of the refrigeration equipment;
the first control unit is used for controlling the first sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor when the current state is the closing state;
and the second control unit is used for controlling the first sub-switch and the second sub-switch of the refrigeration switch and the compressor to work according to the target opening of the refrigeration switch and/or the target rotating speed of the compressor and the current cooling demand of the vehicle when the current state is the opening state.
9. A vehicle control unit, comprising: a thermal management device for a power cell according to any of claims 6 to 8.
10. An electric vehicle, characterized by comprising: the vehicle control unit of claim 9.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113665314A (en) * | 2021-08-04 | 2021-11-19 | 恒大恒驰新能源汽车研究院(上海)有限公司 | Temperature control method and device applied to vehicle |
| CN113815485A (en) * | 2021-09-17 | 2021-12-21 | 岚图汽车科技有限公司 | Intelligent power supply control method of electric automobile and related equipment |
| CN114050355A (en) * | 2021-11-18 | 2022-02-15 | 重庆大学 | Self-identification control battery thermal management device and method |
| CN115139859A (en) * | 2022-06-27 | 2022-10-04 | 中国第一汽车股份有限公司 | Temperature regulation and control method and device, electronic equipment and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203617733U (en) * | 2013-10-29 | 2014-05-28 | 北汽福田汽车股份有限公司 | Power battery pack heating system of electric automobile and electric automobile |
| CN111251939A (en) * | 2018-11-30 | 2020-06-09 | 比亚迪股份有限公司 | Vehicle, reservation management system thereof, reservation system thereof, and reservation management method thereof |
| CN111688544A (en) * | 2020-05-29 | 2020-09-22 | 爱驰汽车有限公司 | Thermal management control method for power battery |
| WO2020186589A1 (en) * | 2019-03-20 | 2020-09-24 | 天津大学 | Thermal management system of hybrid power heavy goods vehicle and control method |
| CN112455185A (en) * | 2020-12-08 | 2021-03-09 | 安徽江淮汽车集团股份有限公司 | Battery thermal management control method, equipment, storage medium and device |
-
2021
- 2021-03-11 CN CN202110265573.7A patent/CN112977157A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203617733U (en) * | 2013-10-29 | 2014-05-28 | 北汽福田汽车股份有限公司 | Power battery pack heating system of electric automobile and electric automobile |
| CN111251939A (en) * | 2018-11-30 | 2020-06-09 | 比亚迪股份有限公司 | Vehicle, reservation management system thereof, reservation system thereof, and reservation management method thereof |
| WO2020186589A1 (en) * | 2019-03-20 | 2020-09-24 | 天津大学 | Thermal management system of hybrid power heavy goods vehicle and control method |
| CN111688544A (en) * | 2020-05-29 | 2020-09-22 | 爱驰汽车有限公司 | Thermal management control method for power battery |
| CN112455185A (en) * | 2020-12-08 | 2021-03-09 | 安徽江淮汽车集团股份有限公司 | Battery thermal management control method, equipment, storage medium and device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113665314A (en) * | 2021-08-04 | 2021-11-19 | 恒大恒驰新能源汽车研究院(上海)有限公司 | Temperature control method and device applied to vehicle |
| CN113815485A (en) * | 2021-09-17 | 2021-12-21 | 岚图汽车科技有限公司 | Intelligent power supply control method of electric automobile and related equipment |
| CN113815485B (en) * | 2021-09-17 | 2024-01-09 | 岚图汽车科技有限公司 | Intelligent compensation control method for electric automobile and related equipment |
| CN114050355A (en) * | 2021-11-18 | 2022-02-15 | 重庆大学 | Self-identification control battery thermal management device and method |
| CN114050355B (en) * | 2021-11-18 | 2023-11-21 | 重庆大学 | Self-identification controlled battery thermal management device and method |
| CN115139859A (en) * | 2022-06-27 | 2022-10-04 | 中国第一汽车股份有限公司 | Temperature regulation and control method and device, electronic equipment and storage medium |
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Application publication date: 20210618 |