CN113258163A - Method and device for controlling temperature of battery - Google Patents
Method and device for controlling temperature of battery Download PDFInfo
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- CN113258163A CN113258163A CN202110485673.0A CN202110485673A CN113258163A CN 113258163 A CN113258163 A CN 113258163A CN 202110485673 A CN202110485673 A CN 202110485673A CN 113258163 A CN113258163 A CN 113258163A
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- battery
- temperature
- duty ratio
- fan
- battery temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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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
Abstract
The application relates to the technical field of automobiles, and discloses a battery temperature control method and device, which are used for controlling a fan to cool a battery. The method comprises the following steps: acquiring the current battery temperature; determining a target duty ratio corresponding to the current battery temperature according to the corresponding relation between the battery temperature and the duty ratio of the fan; and controlling the fan to operate according to the target duty ratio so as to cool the battery. The control method and the control device can effectively avoid the influence of the overtemperature of the battery on the performance of the whole vehicle.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a method and a device for controlling the temperature of a battery.
Background
The 48V light mixing system can improve the standard voltage of the vehicle equipment to 48V, so that the vehicle can drive a vehicle-mounted system with higher power. In practical applications, in a 48V mild hybrid system, when the SOC (State of Charge) of the battery is below 40%, the rising rate of the battery temperature is fast, which may cause the battery temperature to exceed its operating temperature requirement.
In the related art, when the battery has an over-temperature phenomenon, the battery is cooled by limiting the output power of the power system. However, the cooling mode can sacrifice the dynamic property of the vehicle, thereby influencing the control of the whole vehicle.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for controlling a battery temperature, which can effectively avoid an influence of an over-temperature of the battery on an overall performance of the vehicle. Specifically, the method comprises the following technical scheme:
the embodiment of the application provides a control method of battery temperature, and a fan is controlled to cool a battery, and the method comprises the following steps:
acquiring the current battery temperature;
determining a target duty ratio corresponding to the current battery temperature according to the corresponding relation between the battery temperature and the duty ratio of the fan;
and controlling the fan to operate according to the target duty ratio so as to cool the battery.
In an implementation manner of the embodiment of the present application, a correspondence between the battery temperature and the duty ratio of the fan includes:
when the battery temperature reaches a first temperature threshold value, the target duty ratio is a first duty ratio, and when the battery temperature is reduced to a second temperature threshold value, the target duty ratio is a second duty ratio, the second temperature threshold value is smaller than the first temperature threshold value, and the second duty ratio is smaller than the first duty ratio;
when the battery temperature reaches a third temperature threshold and is smaller than the first temperature threshold, the target duty ratio is the second duty ratio, when the battery temperature is reduced to a fourth temperature threshold, the fan is controlled to stop running, the third temperature threshold is smaller than the first temperature threshold, and the fourth temperature threshold is smaller than the third temperature threshold.
In an implementation manner of the embodiment of the present application, a correspondence between the battery temperature and the duty ratio of the fan includes:
the target duty cycle is 100% when the battery temperature reaches 50 ℃, and 80% when the battery temperature falls to 47 ℃;
when the battery temperature reaches 45 ℃ and is lower than 50 ℃, the target duty ratio is 80%, and when the battery temperature is reduced to 42 ℃, the fan is controlled to stop running.
In an implementation manner of the embodiment of the present application, before determining the target duty ratio corresponding to the current battery temperature according to a correspondence between the battery temperature and the duty ratio of the fan, the method further includes:
detecting battery voltage and engine speed;
and when the battery voltage and the engine speed respectively meet corresponding preset conditions, executing the corresponding relation between the battery temperature and the duty ratio of the fan, and determining the target duty ratio corresponding to the current battery temperature.
In an implementation manner of the embodiment of the present application, the controlling the fan to operate according to the target duty ratio includes:
when the battery temperature reaches the fourth temperature threshold value, acquiring a change value of the battery temperature within a preset time;
and when the change value reaches a preset difference value, controlling the fan to stop running.
The embodiment of this application still provides a controlling means of battery temperature, the device is used for controlling the fan to cool down the battery, the device includes:
an acquisition module configured to acquire a current battery temperature;
the determining module is configured to determine a target duty ratio corresponding to the current battery temperature according to a corresponding relation between the battery temperature and the duty ratio of the fan;
a control module configured to control the fan to operate according to the target duty cycle to cool the battery.
In an implementation manner of the embodiment of the present application, a correspondence between the battery temperature and the duty ratio of the fan includes:
when the battery temperature reaches a first temperature threshold value, the target duty ratio is a first duty ratio, and when the battery temperature is reduced to a second temperature threshold value, the target duty ratio is a second duty ratio, the second temperature threshold value is smaller than the first temperature threshold value, and the second duty ratio is smaller than the first duty ratio;
when the battery temperature reaches a third temperature threshold and is smaller than the first temperature threshold, the target duty ratio is the second duty ratio, when the battery temperature is reduced to a fourth temperature threshold, the fan is controlled to stop running, the third temperature threshold is smaller than the first temperature threshold, and the fourth temperature threshold is smaller than the third temperature threshold.
In an implementation manner of the embodiment of the present application, a correspondence between the battery temperature and the duty ratio of the fan includes:
the target duty cycle is 100% when the battery temperature reaches 50 ℃, and 80% when the battery temperature falls to 47 ℃;
when the battery temperature reaches 45 ℃ and is lower than 50 ℃, the target duty ratio is 80%, and when the battery temperature is reduced to 42 ℃, the fan is controlled to stop running.
In an implementation manner of the embodiment of the present application, the apparatus further includes:
a detection module configured to detect a battery voltage and an engine speed;
the execution module is configured to execute the target duty ratio corresponding to the current battery temperature according to the corresponding relation between the battery temperature and the duty ratio of the fan when the battery voltage and the engine speed respectively meet corresponding preset conditions.
In an implementation manner of the embodiment of the present application, the control module includes:
an acquisition submodule configured to acquire a change value of the battery temperature within a predetermined time when the battery temperature reaches the fourth temperature threshold;
a control submodule configured to control the fan to stop operating when the variation value reaches a predetermined difference value.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
according to the control method and the control device for the battery temperature, the fan is controlled to cool the battery through the preset fan control strategy, so that the battery temperature can be effectively controlled, and the influence of the overtemperature of the battery on the performance of the whole vehicle is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for controlling a battery temperature according to an embodiment of the present disclosure;
FIG. 2 is a flow chart illustrating another method for controlling battery temperature according to an embodiment of the present disclosure;
FIG. 3 shows a graph of the change in battery temperature under no-fan conditions;
FIG. 4 shows a graph of the battery temperature at 100% fan duty cycle;
FIG. 5 shows a graph of the battery temperature at 80% fan duty cycle;
fig. 6 shows a schematic structural diagram of a device for controlling the temperature of a battery according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the present application provides a method for controlling a battery temperature, which may be executed by a battery management system or an ECU (Electronic Control Unit) in a vehicle, and is used to Control a fan to cool a battery.
Fig. 1 is a flowchart illustrating a control method of a battery temperature according to an exemplary embodiment, as shown in fig. 1, the vehicle control method including:
step S101, acquiring the current battery temperature;
s102, determining a target duty ratio corresponding to the current battery temperature according to the corresponding relation between the battery temperature and the duty ratio of the fan;
and S103, controlling the fan to operate according to the target duty ratio.
According to the control method for the battery temperature, the fan is controlled to cool the battery through the preset fan control strategy, so that the battery temperature can be effectively controlled, and the influence of the overtemperature of the battery on the performance of the whole vehicle is avoided.
Furthermore, the above method may be performed by a battery management system or an ECU. The development period is short, only ECU software or battery management system software needs to be updated, the development and implementation cost of the method is low, and the risk of battery over-temperature can be effectively reduced.
Optionally, the correspondence between the battery temperature and the duty ratio of the fan includes:
when the temperature of the battery reaches a first temperature threshold value, the target duty ratio is a first duty ratio, and when the temperature of the battery is reduced to a second temperature threshold value, the target duty ratio is a second duty ratio, the second temperature threshold value is smaller than the first temperature threshold value, and the second duty ratio is smaller than the first duty ratio;
when the battery temperature reaches a third temperature threshold and is smaller than the first temperature threshold, the target duty ratio is a second duty ratio, and when the battery temperature is reduced to a fourth temperature threshold, the fan is controlled to stop running, wherein the third temperature threshold is smaller than the first temperature threshold, and the fourth temperature threshold is smaller than the third temperature threshold.
Optionally, the correspondence between the battery temperature and the duty ratio of the fan includes:
the target duty cycle is 100% when the battery temperature reaches 50 ℃, and 80% when the battery temperature drops to 47 ℃;
when the battery temperature reaches 45 ℃ and is lower than 50 ℃, the target duty ratio is 80%, and when the battery temperature is reduced to 42 ℃, the fan is controlled to stop running.
Optionally, before determining the target duty ratio corresponding to the current battery temperature according to the correspondence between the battery temperature and the duty ratio of the fan, the method further includes:
detecting battery voltage and engine speed;
and when the battery voltage and the engine speed respectively meet corresponding preset conditions, determining a target duty ratio corresponding to the current battery temperature according to the corresponding relation between the battery temperature and the duty ratio of the fan.
Optionally, controlling the fan to operate according to the target duty cycle includes:
when the battery temperature reaches a fourth temperature threshold value, acquiring a change value of the battery temperature within a preset time;
and when the change value reaches a preset difference value, controlling the fan to stop running.
FIG. 2 is a flow chart illustrating another method of controlling battery temperature that may be applied to a battery management system in a vehicle according to an exemplary embodiment. As shown in fig. 2, the control method includes:
step S201, acquiring a power-on signal.
After the battery management system acquires the electrifying signal, the battery system enters a discharging mode so as to supply power to electric equipment in the vehicle, and equipment such as a fan, an engine and the like in the vehicle can normally run.
Step S202, battery voltage and engine speed are obtained.
Before the fan is controlled to cool the battery according to a preset fan control strategy, the battery state needs to be ensured to be normal. Therefore, the battery management system can acquire the battery voltage, and when the battery voltage reaches a preset voltage threshold, the battery state can be considered to be normal.
In addition, before the fan is controlled to cool the battery according to a preset fan control strategy, it is required to ensure that the vehicle enters a steady-state working condition. Thus, the battery management system may obtain the engine speed, and when the engine speed reaches a preset speed threshold, the vehicle may be deemed to have entered a steady-state condition. In a specific embodiment, the engine speed may be sent to the battery management system by an ECU or TCU (Transmission Control Unit).
Further, the battery management system may also obtain an engine start end signal, which may also be sent by the ECU or TCU to the battery management system. When the battery management system judges that the time after the start of the transmitter reaches a preset time threshold and the rotating speed of the engine reaches a preset rotating speed threshold, the vehicle can be considered to enter a steady-state working condition.
In a specific embodiment, when the battery management system acquires an engine start ending signal, and judges that a difference value between the time of receiving the engine start ending signal and the current time reaches a preset time threshold value according to the engine start ending signal, the battery management system acquires the rotating speed of the engine; when the engine speed reaches a preset speed threshold, the vehicle is considered to have entered a steady state condition.
In some embodiments of the present application, the battery management system may send a speed request signal to the ECU or TCU, and send the speed of the engine to the battery management system after the ECU or TCU receives the speed request signal. Alternatively, the ECU or TCU may actively provide the engine speed to the battery management system in real time. Similarly, the battery management system may send a start-up end request to the ECU or the TCU after acquiring the power-on signal, and the ECU or the TCU sends an engine start-up end signal to the battery management system in response to the start-up end request. Or the ECU or the TCU actively sends an engine starting end signal to the battery management system after detecting that the engine is started completely.
And when the battery management system judges that the battery state is normal and the vehicle enters a steady-state working condition, the battery management system controls the fan to cool the battery according to a preset fan control strategy. That is, when the battery voltage and the engine speed respectively satisfy the corresponding preset conditions, step S203 is performed. In a specific embodiment, the preset condition at least includes that the battery voltage reaches a preset voltage threshold value, and the engine speed reaches a preset speed threshold value.
In some embodiments, the processes of obtaining the battery voltage and obtaining the engine speed may be performed sequentially or simultaneously.
And step S203, acquiring the current battery temperature.
The current battery temperature may be directly obtained by the battery management system. In a particular embodiment, the battery management system may include a temperature sensor through which the battery management system may obtain the current battery temperature.
In a specific embodiment, this step may be performed after step S202, or may be performed simultaneously with step S202. The battery management system starts to detect the battery temperature after receiving the power-on signal, and controls the motor to operate according to the target duty ratio determined by the following steps after the battery voltage and the engine speed respectively meet corresponding preset conditions.
And S204, determining a target duty ratio corresponding to the current battery temperature according to the corresponding relation between the battery temperature and the duty ratio of the fan.
In the related art, when the battery over-temperature problem occurs in the 48V light hybrid system, the battery is cooled by limiting the output power of the power system, but the cooling method may sacrifice the dynamic performance of the vehicle, reduce the driving feeling of the user, and affect the control of the entire vehicle. To this, this application provides an utilize the fan to come the method of cooling down to the battery, through with battery temperature control under its service temperature to avoid the battery overtemperature to the influence of whole car performance.
The control strategy of the fan is determined according to the temperature change curve of the battery under the condition that the whole vehicle is under the same working condition and without the fan and the temperature change curve of the battery under the condition that the fan is arranged, namely the corresponding relation between the battery temperature and the duty ratio of the fan is determined. In a specific embodiment, the cell temperature profile may be obtained according to WLTP (World light vehicle Test Procedure).
Fig. 3 shows the change in the battery temperature in the fan-less condition. Fig. 3A shows a change curve of the battery temperature and the remaining capacity when the remaining capacity of the battery is above 40%. Fig. 3B shows a change curve of the battery temperature and the remaining capacity when the remaining capacity of the battery is 40% or less.
As can be seen from fig. 3A and 3B, when the battery residual capacity is above 40%, the battery temperature rises by about 4 ℃, and when the battery residual capacity is below 40%, the battery temperature rises by about 12 ℃. It can be seen that when the remaining capacity of the battery is 40% or less, the rate of rise in the battery temperature is high.
Fig. 4 shows the change curve of the battery temperature at a fan duty ratio of 100%. Fig. 4A shows a change curve of the battery temperature under the condition that the initial temperature of the battery is 45 ℃. As can be seen from fig. 4A, under the condition that the duty ratio of the blower is 100%, the battery temperature can be substantially maintained at about the initial temperature (i.e., 45 ℃), and the temperature rise does not exceed 1 ℃. Fig. 4B shows the change curve of the battery temperature under the condition that the initial temperature of the battery is 58 ℃. As can be seen from fig. 4B, the battery temperature drops by about 4 ℃ with the fan duty ratio of 100%. At this time, the dual functions of the output power reduction of the power system and the cooling of the fan can exist.
Fig. 5 shows the change in battery temperature at a fan duty of 80%. Fig. 5A shows a change curve of the battery temperature under the condition that the initial temperature of the battery is 53 ℃. As can be seen from fig. 5A, the battery temperature rises by about 5 ℃ under the condition that the blower duty is 80%. Fig. 5B shows the change curve of the battery temperature under the condition that the initial temperature of the battery is 58 ℃. As can be seen from fig. 5B, the battery temperature rises by about 4 ℃ under the condition that the blower duty is 80%.
Further, fig. 3, 4, and 5 show the change curves of the remaining battery capacity. During the running process of the vehicle, the battery is continuously charged and discharged. When the residual capacity of the battery is high, the battery is preferentially subjected to a discharging process, and when the residual capacity is lower than a certain value, the battery can be subjected to braking energy recovery, so that the residual capacity continuously fluctuates.
As can be seen from the above fig. 3, 4 and 5, when the fan is operated at a duty ratio of 80%, the battery temperature can rise by about 5 ℃, and when the battery temperature reaches 55 ℃, the fan is required to be operated at a duty ratio of 100% to avoid the battery exceeding the operating temperature requirement (about 60 ℃).
Therefore, according to the above analysis, the correspondence between the battery temperature and the duty ratio of the fan (i.e., the fan control strategy) can be predetermined, and the fan is controlled to operate according to the target duty ratio according to the current battery temperature.
For example, the correspondence between the battery temperature and the duty ratio of the fan may include: when the temperature of the battery reaches a first temperature threshold value, the target duty ratio is a first duty ratio, and when the temperature of the battery is reduced to a second temperature threshold value, the target duty ratio is a second duty ratio, the second temperature threshold value is smaller than the first temperature threshold value, and the second duty ratio is smaller than the first duty ratio; when the battery temperature reaches a third temperature threshold and is smaller than the first temperature threshold, the target duty ratio is a second duty ratio, and when the battery temperature is reduced to a fourth temperature threshold, the fan is controlled to stop running, wherein the third temperature threshold is smaller than the first temperature threshold, and the fourth temperature threshold is smaller than the third temperature threshold.
In a specific implementation, the correspondence between the battery temperature and the duty ratio of the fan may include: the target duty cycle is 100% when the battery temperature reaches 50 ℃, and 80% when the battery temperature drops to 47 ℃; when the battery temperature reaches 45 ℃ and is lower than 50 ℃, the target duty ratio is 80%, and when the battery temperature is reduced to 42 ℃, the fan is controlled to stop running. Further, when the battery temperature reaches 42 ℃, the fan can be controlled to start, and the third duty ratio is used as the target duty ratio of the fan. The third duty cycle may be 80%, or may be other duty cycles lower than 80%, such as 60%, 50%, etc.
In the event that the vehicle has been powered up, the battery management system continues to monitor the current battery temperature. When the current battery temperature reaches 45 ℃, the fan operates according to the duty ratio of 80%; when the battery temperature drops to 42 ℃, the blower stops operating. However, since the temperature rise of the battery is affected by the ambient temperature and the use of the battery, inertia may exist in the temperature rise process of the battery, so that it is difficult to meet the requirement of cooling the battery when the fan operates at a duty ratio of 80%. Therefore, when the current battery temperature is detected to exceed 50 ℃ in real time, the fan is controlled to operate according to the maximum duty ratio (namely, the duty ratio is 100%).
In addition, in order to avoid the fan being turned on and off back and forth near the operation stopping temperature (42 ℃), noise being added and driving feeling being influenced, when the battery temperature reaches a fourth temperature threshold (for example, 42 ℃), the change value of the battery temperature in a preset time can be obtained; and when the change value reaches a preset difference value, controlling the fan to stop running. Similarly, when the fan is in a closed state, the battery temperature is detected to reach the fourth temperature threshold value, the change value of the battery temperature in the preset time is also acquired, and when the change value reaches the preset difference value, the fan is controlled to start to operate. This process may be implemented by incorporating hysteresis control in the fan control strategy, for example by a hysteresis comparator.
And S205, controlling the fan to operate according to the target duty ratio.
After the vehicle is powered on, the battery management system continuously monitors the current battery temperature. When the current battery temperature is detected to reach the temperature range, the battery management system can send a fan operation request to the ECU so as to control the fan to operate according to the target duty ratio and avoid the battery overtemperature. Or the battery management system can directly send the fan operation request to the fan so as to enable the fan to operate according to the target duty ratio.
Controlling the fan to operate according to the target duty ratio, further comprising: receiving a fan opening request or a fan closing request triggered by a user, so that the fan is opened according to the fan opening request or closed according to the fan closing request. In particular implementations, a fan control switch may be integrated on the vehicle through which a user may trigger a fan turn-on request and a fan turn-off request. When the user observes that the current battery temperature is high, for example, exceeds a fifth temperature threshold (which may not be higher than the third temperature threshold), the blower does not start to operate, and at this time, the user may manually control the blower to start through the blower control switch. In addition, a plurality of fan gears can be integrated on the vehicle, so that a user can manually select the running gear of the fan. Similarly, when the user observes that the current battery temperature is low, for example, below the fourth temperature threshold, and considers that the blower can be turned off, the blower can be manually turned off through the blower control switch described above. According to the control method for the battery temperature, the fan is controlled to cool the battery through the preset fan control strategy, so that the battery temperature can be effectively controlled, and the influence of the overtemperature of the battery on the performance of the whole vehicle is avoided.
The embodiment of the application also provides a control device 600 for the temperature of the battery, which is used for controlling the fan to cool the battery. As shown in fig. 6, the apparatus 600 includes:
a first obtaining module 601 configured to obtain a current battery temperature;
a determining module 602, configured to determine a target duty ratio corresponding to a current battery temperature according to a corresponding relationship between the battery temperature and a duty ratio of the fan;
a control module 603 configured to control the fan to operate according to the target duty cycle to cool the battery.
Optionally, the correspondence between the battery temperature and the duty ratio of the fan includes:
when the temperature of the battery reaches a first temperature threshold value, the target duty ratio is a first duty ratio, and when the temperature of the battery is reduced to a second temperature threshold value, the target duty ratio is a second duty ratio, the second temperature threshold value is smaller than the first temperature threshold value, and the second duty ratio is smaller than the first duty ratio;
when the battery temperature reaches a third temperature threshold and is smaller than the first temperature threshold, the target duty ratio is a second duty ratio, and when the battery temperature is reduced to a fourth temperature threshold, the fan is controlled to stop running, wherein the third temperature threshold is smaller than the first temperature threshold, and the fourth temperature threshold is smaller than the third temperature threshold.
Optionally, the correspondence between the battery temperature and the duty ratio of the fan includes:
the target duty cycle is 100% when the battery temperature reaches 50 ℃, and 80% when the battery temperature drops to 47 ℃;
when the battery temperature reaches 45 ℃ and is lower than 50 ℃, the target duty ratio is 80%, and when the battery temperature is reduced to 42 ℃, the fan is controlled to stop running.
Optionally, the apparatus further comprises:
a second acquisition module configured to acquire a battery voltage and an engine speed;
and the execution module is configured to execute the determination of the target duty ratio corresponding to the current battery temperature according to the corresponding relation between the battery temperature and the duty ratio of the fan when the battery voltage and the engine speed respectively meet the corresponding preset conditions.
Optionally, the control module comprises:
the obtaining submodule is configured to obtain a change value of the battery temperature in a preset time when the battery temperature reaches a fourth temperature threshold;
and the control submodule is configured to control the fan to stop running when the change value reaches a preset difference value.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the functional modules is illustrated, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules to implement all or part of the functions described above. In addition, the apparatus and method embodiments provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments for details, which are not described herein again.
In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A method for controlling the temperature of a battery is used for controlling a fan to cool the battery, and comprises the following steps:
acquiring the current battery temperature;
determining a target duty ratio corresponding to the current battery temperature according to the corresponding relation between the battery temperature and the duty ratio of the fan;
and controlling the fan to operate according to the target duty ratio so as to cool the battery.
2. The method of claim 1, wherein the correspondence between the battery temperature and the duty cycle of the fan comprises:
when the battery temperature reaches a first temperature threshold value, the target duty ratio is a first duty ratio, and when the battery temperature is reduced to a second temperature threshold value, the target duty ratio is a second duty ratio, the second temperature threshold value is smaller than the first temperature threshold value, and the second duty ratio is smaller than the first duty ratio;
when the battery temperature reaches a third temperature threshold and is smaller than the first temperature threshold, the target duty ratio is the second duty ratio, when the battery temperature is reduced to a fourth temperature threshold, the fan is controlled to stop running, the third temperature threshold is smaller than the first temperature threshold, and the fourth temperature threshold is smaller than the third temperature threshold.
3. The method of claim 1, wherein the correspondence between the battery temperature and the duty cycle of the fan comprises:
the target duty cycle is 100% when the battery temperature reaches 50 ℃, and 80% when the battery temperature falls to 47 ℃;
when the battery temperature reaches 45 ℃ and is lower than 50 ℃, the target duty ratio is 80%, and when the battery temperature is reduced to 42 ℃, the fan is controlled to stop running.
4. The method of claim 1, wherein before determining the target duty cycle corresponding to the current battery temperature according to the correspondence between the battery temperature and the duty cycle of the fan, the method further comprises:
acquiring battery voltage and engine speed;
and when the battery voltage and the engine speed respectively meet corresponding preset conditions, executing the corresponding relation between the battery temperature and the duty ratio of the fan, and determining the target duty ratio corresponding to the current battery temperature.
5. The method of claim 2, wherein the controlling the fan to operate according to the target duty cycle comprises:
when the battery temperature reaches the fourth temperature threshold value, acquiring a change value of the battery temperature within a preset time;
and when the change value reaches a preset difference value, controlling the fan to stop running.
6. The utility model provides a controlling means of battery temperature, its characterized in that, the device is used for controlling the fan to cool down the battery, the device includes:
a first obtaining module configured to obtain a current battery temperature;
the determining module is configured to determine a target duty ratio corresponding to the current battery temperature according to a corresponding relation between the battery temperature and the duty ratio of the fan;
a control module configured to control the fan to operate according to the target duty cycle to cool the battery.
7. The apparatus of claim 6, wherein the correspondence between the battery temperature and the duty cycle of the fan comprises:
when the battery temperature reaches a first temperature threshold value, the target duty ratio is a first duty ratio, and when the battery temperature is reduced to a second temperature threshold value, the target duty ratio is a second duty ratio, the second temperature threshold value is smaller than the first temperature threshold value, and the second duty ratio is smaller than the first duty ratio;
when the battery temperature reaches a third temperature threshold and is smaller than the first temperature threshold, the target duty ratio is the second duty ratio, when the battery temperature is reduced to a fourth temperature threshold, the fan is controlled to stop running, the third temperature threshold is smaller than the first temperature threshold, and the fourth temperature threshold is smaller than the third temperature threshold.
8. The apparatus of claim 6, wherein the correspondence between the battery temperature and the duty cycle of the fan comprises:
the target duty cycle is 100% when the battery temperature reaches 50 ℃, and 80% when the battery temperature falls to 47 ℃;
when the battery temperature reaches 45 ℃ and is lower than 50 ℃, the target duty ratio is 80%, and when the battery temperature is reduced to 42 ℃, the fan is controlled to stop running.
9. The apparatus of claim 6, further comprising:
a second acquisition module configured to acquire a battery voltage and an engine speed;
the execution module is configured to execute the target duty ratio corresponding to the current battery temperature according to the corresponding relation between the battery temperature and the duty ratio of the fan when the battery voltage and the engine speed respectively meet corresponding preset conditions.
10. The apparatus of claim 7, wherein the control module comprises:
an acquisition submodule configured to acquire a change value of the battery temperature within a predetermined time when the battery temperature reaches the fourth temperature threshold;
a control submodule configured to control the fan to stop operating when the variation value reaches a predetermined difference value.
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