CN117962688A - Battery temperature determining method and device, vehicle-mounted terminal and vehicle - Google Patents
Battery temperature determining method and device, vehicle-mounted terminal and vehicle Download PDFInfo
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Abstract
The application is suitable for the technical field of automobiles, and provides a method and a device for determining the temperature of a battery, a vehicle-mounted terminal and a vehicle, wherein the method comprises the following steps: when a power battery of a vehicle is charged, acquiring environment information of an area where the vehicle is located, state information of a thermal management system of the vehicle and battery information of the power battery; based on the state information, determining the temperature change rate in the vehicle corresponding to the thermal management system; and predicting the target battery temperature of the power battery based on the environmental information, the battery information and the temperature change rate in the vehicle. Compared with the prior art that the battery temperature of the power battery is predicted by only combining external environment information, the method can be used for more accurately predicting the battery temperature of the power battery by combining the environment information, the state information of a thermal management system of a vehicle and the battery information of the power battery, so that the accurate target battery temperature is obtained, and the accuracy of predicting the battery temperature of the power battery in the charging process is improved.
Description
Technical Field
The application belongs to the technical field of automobiles, and particularly relates to a method and a device for determining battery temperature, a vehicle-mounted terminal and a vehicle.
Background
Along with the rapid development of new energy automobiles, the power batteries of the new energy automobiles are also widely applied, so that the power batteries are highly focused on the performance of safety in use, long service life and the like. The battery temperature of the power battery in the charging process can affect the use safety and the service life of the power battery, so that the battery temperature of the power battery in the charging process needs to be determined in real time.
However, in the prior art, the battery temperature of the new energy power battery at the next moment in the charging process is simply predicted by combining external environment information, and consideration is not comprehensive enough, so that the accuracy of predicting the battery temperature of the new energy power battery in the charging process is reduced.
Disclosure of Invention
The embodiment of the application provides a battery temperature determining method and device, a vehicle-mounted terminal and a vehicle, and improves the accuracy of predicting the battery temperature of a power battery in the charging process.
In a first aspect, an embodiment of the present application provides a method for determining a battery temperature, including:
when a power battery of a vehicle is charged, acquiring environmental information of an area where the vehicle is located, state information of a thermal management system of the vehicle and battery information of the power battery;
determining the temperature change rate in the vehicle corresponding to the thermal management system based on the state information;
And predicting the target battery temperature of the power battery based on the environment information, the battery information and the temperature change rate in the vehicle.
Optionally, the state information includes an on state and an off state; the determining, based on the state information, a temperature change rate in the vehicle corresponding to the thermal management system includes:
determining that the in-vehicle temperature change rate is 0 when the thermal management system is in a closed state;
Determining a reference variation amplitude of the temperature in the vehicle in a historical time period when the thermal management system is in an on state; and determining the temperature change rate in the vehicle according to the reference change amplitude.
Optionally, the environmental information includes an off-vehicle temperature at each historical time in the historical time period; the battery information comprises initial battery temperature, historical battery temperature at each historical time in the historical time period and current heat generation rate; the predicting, based on the environmental information, the battery information, and the in-vehicle temperature change rate, the target battery temperature of the power battery includes:
determining a first influence factor according to the outside temperature and the historical battery temperature at each historical time in the historical time period;
Determining a second influence factor according to the temperature change rate in the vehicle;
Determining a third influencing factor according to the battery heat generation rate;
and predicting the target battery temperature based on the first influence factor, the second influence factor and the third influence factor.
Optionally, the environmental information includes an off-vehicle temperature at each historical time in the historical time period; the battery information comprises initial battery temperature, historical battery temperature at each historical time in the historical time period and current heat generation rate; the predicting, based on the environmental information, the battery information, and the in-vehicle temperature change rate, the target battery temperature of the power battery includes:
Traversing and calculating the temperature difference between the outside temperature and the historical battery temperature at the same historical time in the historical time period to obtain a temperature difference set;
Determining a temperature difference change rate based on the temperature difference set;
Determining the predicted time length of the battery temperature according to the state information; the predicted time period is used for describing the time period of the change of the battery temperature of the power battery;
And calculating to obtain the target battery temperature of the power battery after the predicted time according to the temperature difference change rate, the temperature change rate in the vehicle, the current heat generation rate and the initial battery temperature.
Optionally, the state information includes an on state and an off state; the opening state comprises a heating state and a refrigerating state; the determining the predicted time length of the battery temperature according to the state information comprises the following steps:
Determining a first time period as the predicted time period when the thermal management system is in the heating state;
determining a second duration as the predicted duration when the thermal management system is in the cooling state;
determining a third duration as a predicted duration when the thermal management system is in the off state; the third time period is longer than the second time period and the first time period.
Optionally, after predicting the target battery temperature of the power battery based on the environmental information, the battery information, and the in-vehicle temperature change rate, the method further includes:
determining a target charging current of the power battery based on the target battery temperature;
And charging the power battery based on the charging current.
Optionally, the determining the target charging current of the power battery based on the target battery temperature includes:
obtaining the maximum output current of the charging equipment, the initial electric quantity of the power battery and the initial charging current of the power battery; the initial electric quantity refers to the electric quantity of the power battery when the power battery is not charged;
Predicting the target electric quantity of the power battery after the predicted duration based on the initial charging current and the initial electric quantity; wherein the predicted time period is used for describing the time period of the change of the battery temperature of the power battery;
Determining a standard charging current of the power battery after the predicted time period according to the target electric quantity and the target battery temperature;
the target charging current is determined from the standard charging current and the maximum output current.
In a second aspect, an embodiment of the present application provides a device for determining a temperature of a battery, including:
a first obtaining unit, configured to obtain, when a power battery of a vehicle is being charged, environmental information of an area where the vehicle is located, state information of a thermal management system of the vehicle, and battery information of the power battery;
a first rate determining unit, configured to determine an in-vehicle temperature change rate corresponding to the thermal management system based on the state information;
And the first prediction unit is used for predicting and obtaining the target battery temperature of the power battery based on the environment information, the battery information and the temperature change rate in the vehicle.
In a third aspect, an embodiment of the present application provides a vehicle-mounted terminal, including: a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the method of determining the temperature of a battery as in any of the first aspects above when the computer program is executed.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium storing a computer program which, when executed by a processor, implements a method of determining a battery temperature as described in any one of the first aspects above.
In a fifth aspect, an embodiment of the present application provides a computer program product, which, when run on a vehicle-mounted terminal, enables the vehicle-mounted terminal to perform the method for determining the temperature of a battery according to any one of the first aspects above.
In a sixth aspect, an embodiment of the present application provides a vehicle, including a vehicle-mounted terminal configured to perform the information display method according to any one of the first aspects.
Compared with the prior art, the embodiment of the application has the beneficial effects that:
according to the method for determining the battery temperature, when the power battery of the vehicle is charged, environment information of the area where the vehicle is located, state information of a thermal management system of the vehicle and battery information of the power battery are obtained; based on the state information, determining the temperature change rate in the vehicle corresponding to the thermal management system; and predicting the target battery temperature of the power battery based on the environmental information, the battery information and the temperature change rate in the vehicle. Compared with the prior art that the battery temperature of the power battery is predicted by only combining external environment information, the method can be used for more accurately predicting the battery temperature of the power battery by combining the environment information, the state information of a thermal management system of a vehicle and the battery information of the power battery, so that the accurate target battery temperature is obtained, and the accuracy of predicting the battery temperature of the power battery in the charging process is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a method for determining a battery temperature according to an embodiment of the present application;
FIG. 2 is a flowchart of a method for determining a battery temperature according to another embodiment of the present application;
FIG. 3 is a flowchart illustrating a method for determining a battery temperature according to still another embodiment of the present application;
FIG. 4 is a flowchart of an implementation of a method for determining a battery temperature according to still another embodiment of the present application;
Fig. 5 is a schematic structural view of a battery temperature determining apparatus according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a vehicle-mounted terminal according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in the present description and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
In practical application, along with the rapid development of new energy automobiles, power batteries of the new energy automobiles are also widely applied, so that the performances of safety in use, long service life and the like of the power batteries are highly paid attention to. The safety of the power battery is the most basic and important performance, which affects the use safety of the new energy automobile on one hand and the service life of the power battery on the other hand. The battery temperature of the power battery in the charging process can have total influence on the use safety and the service life of the power battery. Therefore, in order to ensure the use safety of the power battery, early warning is required when the battery temperature of the power battery changes abnormally during the charging process of the power battery, that is, early prediction is required for the battery temperature of the power battery during the charging process.
However, in the prior art, the battery temperature of the power battery at the next moment in the charging process is simply predicted by combining external environment information, and consideration is not comprehensive enough, so that the accuracy of predicting the battery temperature of the power battery in the charging process is reduced.
Based on this, in all embodiments of the present application, a method for determining a battery temperature is provided to improve accuracy of predicting a battery temperature of a power battery in a charging process, and a specific implementation process of the method for determining a battery temperature may be described in detail in embodiments corresponding to the following figures, which are not described herein.
The vehicle in all the embodiments of the present application is a vehicle equipped with a power battery.
Referring to fig. 1, fig. 1 is a flowchart illustrating an implementation of a method for determining a battery temperature according to an embodiment of the application. In the embodiment of the application, the execution main body of the battery temperature determining method is a vehicle-mounted terminal.
As shown in fig. 1, the method for determining the battery temperature according to an embodiment of the present application may include S101 to S103, which are described in detail as follows:
In S101, when a power battery of a vehicle is being charged, environmental information of an area where the vehicle is located, state information of a thermal management system of the vehicle, and battery information of the power battery are acquired.
In practical application, in order to predict the battery temperature of the power battery in the charging process in real time, a user may send a temperature prediction request to the vehicle-mounted terminal.
In the embodiment of the present application, the detecting, by the vehicle-mounted terminal, the temperature prediction request may include: a preset operation for the in-vehicle terminal is detected. The preset operation may be determined according to actual needs, and is not limited herein. By way of example, the preset operation may be: the preset control of the vehicle-mounted terminal is triggered, or the vehicle is electrically connected with the charging equipment. Based on the above, when the vehicle-mounted terminal detects that the preset control of the vehicle-mounted terminal is triggered, the vehicle-mounted terminal indicates that the preset operation is detected, namely the temperature prediction request is detected. The charging device can be a charging pile or other devices for charging a power battery of the vehicle.
After detecting the temperature prediction request, the vehicle-mounted terminal can detect whether the power battery of the vehicle is being charged or not in real time.
In one implementation manner of the embodiment of the application, when the vehicle terminal detects that the vehicle is electrically connected with the charging device, the vehicle terminal can determine that the power battery of the vehicle is being charged.
In the embodiment of the application, when the vehicle-mounted terminal detects that the power battery of the vehicle is charged, the environment information of the area where the vehicle is located, the state information of the thermal management system of the vehicle and the battery information of the power battery can be obtained.
In practical applications, thermal management is a process of adjusting and controlling the temperature or temperature difference thereof by heating or cooling means according to the requirements of specific objects.
Thermal management systems for vehicles include, but are not limited to: a compressor, a PTC heater, a cooling water pump, a fan, a thermostat and the like.
The environmental information includes, but is not limited to, the off-board temperature at each historical time during the historical time period. The historical time period can be determined according to actual needs, and is not limited herein.
In one implementation manner of the embodiment of the application, the vehicle-mounted terminal can acquire the temperature of the area where the vehicle is located in real time through a temperature sensor which is connected with the vehicle in a wireless communication manner and is located in the area where the vehicle is located.
The state information includes, but is not limited to, an on state and an off state. The on state specifically refers to that part or all of devices in a thermal management system of a vehicle are in a working state, and the off state specifically refers to that all of the devices in the thermal management system of the vehicle are in a off state, namely in a non-working state.
In one implementation of the embodiment of the present application, the vehicle-mounted terminal may determine the status information of the thermal management system of the vehicle by detecting whether each device in the thermal management system of the vehicle is turned on.
In another implementation manner of the embodiment of the present application, the vehicle-mounted terminal may further detect whether a control for controlling opening and closing of the thermal management system of the vehicle is triggered, so as to determine status information of the thermal management system of the vehicle.
In still another implementation manner of the embodiment of the present application, since the thermal management system of the vehicle may be automatically turned on and off according to the initial battery temperature of the power battery, that is, the vehicle-mounted terminal may turn on or off the thermal management system of the vehicle according to the initial battery temperature.
In some possible embodiments, the in-vehicle terminal may control the thermal management system of the vehicle to be in a closed state when detecting that the initial temperature of the battery is greater than the first threshold and less than the second threshold; when the vehicle-mounted terminal detects that the initial temperature of the battery is smaller than or equal to a first threshold value or the initial temperature of the battery is larger than or equal to a second threshold value, the vehicle-mounted terminal can control a thermal management system of the vehicle to be in an on state. The first threshold and the second threshold may be determined according to actual needs, and are not limited herein.
The first threshold may be determined according to a battery temperature of the power battery when the thermal management system of the vehicle is in a heated state.
The second threshold may be determined based on a battery temperature of the power battery when the thermal management system of the vehicle is in a cooling state.
Accordingly, the in-vehicle terminal may determine state information of the thermal management system of the vehicle according to the initial battery temperature.
Specifically, when the vehicle-mounted terminal detects that the initial temperature of the battery is greater than a first threshold value and less than a second threshold value, the vehicle-mounted terminal can determine that a thermal management system of the vehicle is in a closed state; when the vehicle-mounted terminal detects that the initial temperature of the battery is greater than or equal to the second threshold value, the vehicle-mounted terminal can determine that the thermal management system of the vehicle is in an on state.
Battery information includes, but is not limited to: initial battery temperature, historical battery temperature at each historical time during the historical time period, and current heat generation rate. The current heat generation rate specifically refers to the rate of change of the battery temperature of the power battery at the reference charging current. The reference charging current may be determined according to actual needs, and is not limited herein. Illustratively, the reference charge current is 1A.
In S102, based on the status information, a rate of change of the temperature in the vehicle corresponding to the thermal management system is determined.
In the embodiment of the application, because the state information of the thermal management system of the vehicle comprises, but is not limited to, an opening state and a closing state, the vehicle-mounted terminal can acquire the change amplitude of the temperature in the vehicle under different states of the thermal management system, and determine the change rate of the temperature in the vehicle under different states of the thermal management system according to the temperature in the vehicle.
In one embodiment of the application, the vehicle-mounted terminal determines the temperature change rate in the vehicle according to the following steps, which are described in detail as follows:
determining that the in-vehicle temperature change rate is 0 when the thermal management system is in a closed state;
Determining a reference variation amplitude of the temperature in the vehicle in a historical time period when the thermal management system is in an on state; and determining the temperature change rate in the vehicle according to the reference change amplitude.
In this embodiment, since the temperature in the vehicle does not change much when the thermal management system of the vehicle is in the off state, the in-vehicle terminal can determine that the temperature change range in the vehicle is 0 when the thermal management system is in the off state, and based on this, the in-vehicle terminal can directly determine that the temperature change rate in the vehicle is 0 at this time.
Because the temperature in the vehicle can change greatly when the thermal management system of the vehicle is in an open state, the vehicle-mounted terminal can determine the reference change amplitude of the temperature in the vehicle according to the change amplitude set of the temperature in the vehicle in the history time period when the thermal management system is in the open state, and then the vehicle-mounted terminal can determine the change rate of the temperature in the vehicle according to the reference change amplitude.
It should be noted that, since the on state of the thermal management system of the vehicle includes, but is not limited to, a heating state and a cooling state, the in-vehicle temperature change rate includes, but is not limited to, a first rate and a second rate. Wherein the first rate is specifically an in-vehicle temperature change rate of the thermal management system of the vehicle in a heated state, and the geothermal rate is specifically an in-vehicle temperature change rate of the thermal management system of the vehicle in a cooled state.
In S103, a target battery temperature of the power battery is predicted based on the environmental information, the battery information, and the in-vehicle temperature change rate.
In the embodiment of the application, the vehicle-mounted terminal can predict the battery temperature of the power battery at the next moment by combining the acquired environmental information, the acquired battery information and the acquired temperature change rate in the vehicle, so as to predict and obtain the target battery temperature of the power battery at the next moment.
Specifically, the vehicle-mounted terminal can determine the temperature difference change rate according to the outside temperature of the vehicle at each historical time in the historical time period in the environment information and the historical battery temperature at each historical time in the historical time period in the battery information, and based on the temperature difference change rate, the vehicle-mounted terminal can accurately predict and obtain the target battery temperature of the power battery according to the initial battery temperature, the in-vehicle temperature change rate, the temperature difference change rate and the current heat generation rate. The temperature difference change rate specifically refers to the change rate of the temperature difference between the outside temperature and the battery temperature.
In one embodiment of the present application, in combination with S101, when the environmental information includes the off-vehicle temperature at each of the historical times in the historical period; when the battery information includes the initial battery temperature, the historical battery temperature at each historical time in the historical time period, and the current heat generation rate, the vehicle-mounted terminal may specifically determine the target battery temperature through steps S201 to S204 shown in fig. 2, which is described in detail as follows:
in S201, a first influencing factor is determined according to the off-board temperature and the historical battery temperature at each historical time in the historical period.
In S202, a second influence factor is determined according to the in-vehicle temperature change rate.
In S203, a third influencing factor is determined from the battery heat generation rate.
In S204, the target battery temperature is predicted based on the first influence factor, the second influence factor, and the third influence factor.
In this embodiment, the vehicle-mounted terminal may determine a first influence factor of the external temperature of the vehicle on the battery temperature according to the external temperature of the vehicle at each historical time in the historical time period and the historical battery temperature at each historical time in the historical time period; the vehicle-mounted terminal can determine a second influence factor of the temperature in the vehicle on the temperature of the battery according to the change rate of the temperature in the vehicle; the vehicle-mounted terminal can determine a third influence factor of the charging current on the battery temperature according to the battery heat generation rate; finally, the vehicle-mounted terminal can predict the battery temperature of the power battery at the next moment according to the initial battery temperature of the power battery, the first influence factor, the second influence factor and the third influence factor, so as to predict and obtain the target battery temperature of the power battery at the next moment.
In some possible embodiments, the vehicle-mounted terminal may determine a first variation range of the vehicle-mounted temperature in the historical time period and a second variation range of the battery temperature in the historical time period according to the vehicle-mounted temperature at each historical time point in the historical time period and the historical battery temperature at each historical time point in the historical time period, and determine a ratio between the first variation range and the second variation range as the first influence factor.
In other possible embodiments, since the temperature in the vehicle may affect the temperature of the battery, the vehicle terminal may determine a third variation range of the temperature in the vehicle in the history period according to the rate of variation of the temperature in the vehicle, and determine a ratio between the third variation range and the second variation range as the second affecting factor.
In still other possible embodiments, the vehicle-mounted terminal may determine a fourth variation amplitude of the power battery in the history period according to the current heat generation rate, and determine a ratio between the fourth variation amplitude and the second variation amplitude as the third influence factor.
Based on the above, the vehicle-mounted terminal may introduce the first influence factor, the second influence factor and the third influence factor into a preset temperature formula to predict and obtain the target battery temperature of the power battery at the next moment.
Specifically, the preset temperature formula is as follows:
；
Wherein, Indicating the target battery temperature of the power battery at the next moment,/>Representing the first influencing factor,/>Representing a second influencing factor,/>Representing a third influencing factor,/>Representing a second amplitude of change in battery temperature over a historical period of time,/>、/>/>Representing a preset coefficient.
In another embodiment of the present application, since the battery temperature of the power battery does not change at each time of the charging stage, in order to accurately predict the target battery temperature of the power battery after the temperature change, the vehicle-mounted terminal may specifically determine the target battery temperature after the battery temperature change through steps S301 to S304 shown in fig. 3, as follows:
in S301, the temperature difference between the temperature outside the vehicle and the temperature of the historical battery at the same historical time in the historical time period is calculated through traversal, so as to obtain a temperature difference set.
In S302, a temperature difference change rate is determined based on the set of temperature differences.
It should be noted that the temperature difference set includes the temperature differences corresponding to each of the historical moments in the historical time period.
In this embodiment, the vehicle-mounted terminal may construct a temperature difference graph according to the temperature differences corresponding to each historical time in the temperature difference set, determine a slope of a curve corresponding to the temperature difference graph, and then determine the slope as a temperature difference change rate.
In S303, determining a predicted time period of the battery temperature according to the state information; the predicted time period is used for describing the time period when the battery temperature of the power battery changes.
In this embodiment, when the thermal management system of the vehicle is in different states, the temperature in the vehicle is different, and the temperature in the vehicle may affect the battery temperature, that is, affect the duration of the change of the battery temperature of the power battery, so the vehicle-mounted terminal needs to determine the predicted duration of the battery temperature according to the state information of the thermal management system of the vehicle. The predicted time period is used for describing the time period of the change of the battery temperature of the power battery.
In one embodiment of the present application, since the state information of the thermal management system of the vehicle includes, but is not limited to, an on state and an off state, and the on state includes, but is not limited to, a heating state and a cooling state, the in-vehicle terminal may specifically determine the above-described predicted time period according to the following steps, which are described in detail as follows:
Determining a first time period as the predicted time period when the thermal management system is in the heating state;
determining a second duration as the predicted duration when the thermal management system is in the cooling state;
determining a third duration as a predicted duration when the thermal management system is in the off state; the third time period is longer than the second time period and the first time period.
In this embodiment, different states of the thermal management system of the vehicle correspond to different predicted durations. The predicted time period includes, but is not limited to, a first time period, a second time period, and a third time period. The first duration, the second duration, and the third duration may be set according to actual needs, which are not limited herein.
In some possible embodiments, the vehicle-mounted terminal may obtain a first temperature set of the power battery at each historical time in the historical time period when the thermal management system of the vehicle is in a heating state, and determine a first duration according to the first temperature set; the vehicle-mounted terminal can acquire a second temperature set of the power battery at each historical time in the historical time period when the thermal management system of the vehicle is in a refrigerating state, and determine a second duration according to the second temperature set; the vehicle-mounted terminal can acquire a third temperature set of the power battery at each historical time in the historical time period when the thermal management system of the vehicle is in a closed state, and determine a third duration according to the third temperature set.
It should be noted that, when the thermal management system of the vehicle is in the on state, the influence of the temperature in the vehicle on the battery temperature is greater than when the thermal management system of the vehicle is in the off state, that is, when the thermal management system of the vehicle is in the on state, the duration of the change of the battery temperature is shorter than when the thermal management system of the vehicle is in the off state. Thus, the third time period is longer than the first time period and the second time period.
In this embodiment, the vehicle-mounted terminal may set the predicted time length corresponding to the heating state as the first time length, the vehicle-mounted terminal may set the predicted time length corresponding to the cooling state as the second time length, and the vehicle-mounted terminal may set the predicted time length corresponding to the closing state as the third time length.
Based on this, the vehicle-mounted terminal may determine the first time period as the predicted time period when detecting that the thermal management system is in the heating state; when the vehicle-mounted terminal detects that the thermal management system is in a refrigerating state, the second duration can be determined as the predicted duration; when the vehicle-mounted terminal detects that the thermal management system is in the closed state, the third duration can be determined to be the predicted duration.
In S304, a target battery temperature of the power battery after the predicted time period is calculated according to the temperature difference change rate, the in-vehicle temperature change rate, the current heat generation rate, and the initial battery temperature.
In this embodiment, after determining the predicted time, the vehicle-mounted terminal may calculate, according to the temperature difference change rate, the in-vehicle temperature change rate, the current heat generation rate, and the initial battery temperature, a target battery temperature of the power battery after the predicted time.
Specifically, the vehicle-mounted terminal may determine a first change temperature of the power battery after the predicted time period according to the temperature difference change rate; the vehicle-mounted terminal can determine a second change temperature of the power battery after the predicted time period according to the temperature change rate in the vehicle; the vehicle-mounted terminal can determine a third change temperature of the power battery after the predicted time according to the current heat generation rate, and then calculate a target battery temperature of the power battery after the predicted time according to the initial battery temperature, the first change temperature, the second change temperature and the third change temperature.
In one embodiment of the present application, the vehicle-mounted terminal may specifically calculate the target battery temperature of the power battery after the predicted time period according to the following formula:
；
Wherein T represents a target battery temperature of the power battery after a predicted period of time, T0 represents an initial battery temperature of the power battery, Representing the rate of change of temperature difference,/>Indicating the rate of change of temperature in a vehicle,/>Indicating the rate of current heat generation and Δt indicating the predicted time period.
As can be seen from the above, according to the method for determining the battery temperature provided by the embodiment of the application, when the power battery of the vehicle is charged, the environmental information of the area where the vehicle is located, the state information of the thermal management system of the vehicle and the battery information of the power battery are obtained; based on the state information, determining the temperature change rate in the vehicle corresponding to the thermal management system; and predicting the target battery temperature of the power battery based on the environmental information, the battery information and the temperature change rate in the vehicle. Compared with the prior art that the battery temperature of the power battery is predicted by only combining external environment information, the method can be used for more accurately predicting the battery temperature of the power battery by combining the environment information, the state information of a thermal management system of a vehicle and the battery information of the power battery, so that the accurate target battery temperature is obtained, and the accuracy of predicting the battery temperature of the power battery in the charging process is improved.
In one embodiment of the present application, in order to improve the safety of the power battery during the charging process, the vehicle terminal may specifically implement the charging of the power battery through steps S401 to S402 as shown in fig. 4. Based on this, referring to fig. 4, fig. 4 is a flowchart illustrating a method for determining a battery temperature according to another embodiment of the present application. Compared to the corresponding embodiment of fig. 1, the embodiment may further include S401 to S402 after S102, which is described in detail below:
In S401, a target charging current of the power battery is determined based on the target battery temperature.
In this embodiment, the corresponding relation between different battery temperatures and different charging currents is stored in advance in the vehicle-mounted terminal, so that the vehicle-mounted terminal can determine the charging current of the power battery at the next moment, that is, the target charging current, according to the target battery temperature of the power battery and the corresponding relation.
In one embodiment of the present application, in order to determine the accuracy of the target charging current, the vehicle-mounted terminal may specifically determine the target charging current according to the following steps, which are described in detail as follows:
obtaining the maximum output current of the charging equipment, the initial electric quantity of the power battery and the initial charging current of the power battery; the initial electric quantity refers to the electric quantity of the power battery when the power battery is not charged;
Predicting the target electric quantity of the power battery after the predicted duration based on the initial charging current and the initial electric quantity; wherein the predicted time period is used for describing the time period of the change of the battery temperature of the power battery;
Determining a standard charging current of the power battery after the predicted time period according to the target electric quantity and the target battery temperature;
the target charging current is determined from the standard charging current and the maximum output current.
In one implementation manner of this embodiment, the vehicle-mounted terminal may determine, from the current calibration table, a first charging current of the power battery at an initial charging time according to an initial power amount and an initial battery temperature of the power battery, and then, in order to avoid that the charging current is too large to affect the safety of the power battery in a charging process, the vehicle-mounted terminal may compare the first charging current with a maximum output current, and determine a smaller value between the first charging current and the maximum output current as the initial charging current. The current calibration meter is used for describing ideal charging current at different battery temperatures and different electric quantities.
In this embodiment, the initial power refers to the power of the power battery when the power battery is not charged, i.e. the power of the power battery at the last time before the power battery is not charged.
After the vehicle-mounted terminal obtains the initial charging current and the initial electric quantity, the target electric quantity of the power battery after the predicted duration can be predicted. The predicted time period is used for describing the time period of the change of the battery temperature of the power battery.
In this embodiment, the target power of the power battery after the predicted period of time may be generally indicated by symbol SOC (State Of Charge), that is, the ratio of the available power in the battery to the nominal capacity. The SOC value of the battery may reflect the state of charge of the battery, typically expressed in percent.
Specifically, the vehicle-mounted terminal may calculate the target electric quantity of the power battery after the predicted time period according to the following formula:
SOC=+/>*△t/C；
Wherein, the SOC represents the target electric quantity of the power battery after the predicted time period, Representing the initial charge,/>Indicating an initial charge current, Δt indicating a predicted time period, and C indicating a maximum available capacity of the power battery.
It should be noted that, the target electric quantity of the power battery after the predicted time period specifically indicates the electric quantity of the power battery after the predicted time period of charging on the basis of the initial electric quantity, that is, the proportion of the available electric quantity in the power battery to the nominal capacity after the predicted time period of charging. That is, the target electric quantity of the power battery after the predicted time period is a pure digital ratio, and based on the target electric quantity, the initial electric quantity is also a pure digital ratio. At the same time, the method comprises the steps of,* The delta t/C represents the electric quantity increase proportion of the power battery after the predicted charging time, so that the target electric quantity of the power battery after the predicted charging time can be calculated by combining the formula.
And then, the vehicle-mounted terminal can determine the standard charging current of the power battery after the predicted time period from the current calibration table according to the target electric quantity of the power battery and the target battery temperature.
Finally, the in-vehicle terminal may compare the standard charging current with the maximum output current, and determine a smaller value between the standard charging current and the maximum output current as the target charging current.
In S402, the power battery is charged based on the charging current.
In this embodiment, after obtaining the target charging current, the vehicle-mounted terminal may send the target charging current to the charging device, so that the charging device charges the power battery according to the target charging current.
As can be seen from the above, the method for determining the battery temperature provided by the embodiment can flexibly control the charging current of the power battery in combination with the target battery temperature of the power battery, so as to avoid the condition that the power battery is overcharged or the battery temperature is too high due to the charging of the power battery under an unsuitable charging current, thereby improving the safety of the power battery in the charging process.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
Fig. 5 is a schematic structural diagram of a battery temperature determining apparatus according to an embodiment of the present application, corresponding to a battery temperature determining method described in the foregoing embodiments, and for convenience of explanation, only a portion related to the embodiment of the present application is shown. Referring to fig. 5, the battery temperature determining apparatus 500 includes: a first acquisition unit 51, a first rate determination unit 52, and a first prediction unit 53. Wherein:
The first obtaining unit 51 is configured to obtain, when a power battery of a vehicle is being charged, environmental information of an area where the vehicle is located, status information of a thermal management system of the vehicle, and battery information of the power battery.
The first rate determining unit 52 is configured to determine a rate of change of the temperature in the vehicle corresponding to the thermal management system based on the status information.
The first prediction unit 52 is configured to predict a target battery temperature of the power battery based on the environmental information, the battery information, and the in-vehicle temperature change rate.
In one embodiment of the application, the state information includes an on state and an off state; the first rate determination unit 52 specifically includes: a second rate determination unit and a third rate determination unit. Wherein:
The second rate determining unit is configured to determine that the in-vehicle temperature change rate is 0 when the thermal management system is in an off state.
The third speed determining unit is used for determining the standard change amplitude of the temperature in the vehicle in a historical time period when the thermal management system is in an on state; and determining the temperature change rate in the vehicle according to the reference change amplitude.
In one embodiment of the present application, the environmental information includes an off-vehicle temperature at each of the historical times over the historical time period; the battery information comprises initial battery temperature, historical battery temperature at each historical time in the historical time period and current heat generation rate; the first prediction unit 53 specifically includes: the first factor determining unit, the second factor determining unit, the third factor determining unit and the second predicting unit. Wherein:
the first factor determining unit is used for determining a first influence factor according to the outside temperature and the historical battery temperature at each historical time in the historical time period.
The second factor determining unit is used for determining a second influence factor according to the temperature change rate in the vehicle.
The third factor determining unit is used for determining a third influence factor according to the battery heat generating rate.
The second prediction unit is used for predicting and obtaining the target battery temperature based on the first influence factor, the second influence factor and the third influence factor.
In one embodiment of the present application, the environmental information includes an off-vehicle temperature at each of the historical times over the historical time period; the battery information comprises initial battery temperature, historical battery temperature at each historical time in the historical time period and current heat generation rate; the second prediction unit specifically includes: the device comprises a first calculating unit, a fourth speed determining unit, a first time length determining unit and a second calculating unit. Wherein:
The first calculation unit is used for performing traversal calculation on the temperature difference between the outside temperature and the historical battery temperature at the same historical time in the historical time period to obtain a temperature difference set.
The fourth rate determination unit is configured to determine a rate of change of the temperature difference based on the set of temperature differences.
The first time length determining unit is used for determining the predicted time length of the battery temperature according to the state information; the predicted time period is used for describing the time period when the battery temperature of the power battery changes.
And the second calculation unit is used for calculating the target battery temperature of the power battery after the predicted duration according to the temperature difference change rate, the temperature change rate in the vehicle, the current heat generation rate and the initial battery temperature.
In one embodiment of the present application, the on state includes a heating state and a cooling state; the first time length determining unit specifically includes: the device comprises a second time length determining unit, a third time length determining unit and a fourth time length determining unit. Wherein:
The second duration determining unit is configured to determine the first duration as the predicted duration when the thermal management system is in the heating state.
The third duration determining unit is configured to determine, when the thermal management system is in the refrigeration state, the second duration as the predicted duration.
The fourth time length determining unit is used for determining the third time length as a predicted time length when the thermal management system is in the closed state; the third time period is longer than the second time period and the first time period.
In one embodiment of the present application, the determining apparatus 500 of the battery temperature further includes: a first current determining unit and a charging unit. Wherein:
the first current determination unit is used for determining a target charging current of the power battery based on the target battery temperature.
The charging unit is used for charging the power battery based on the charging current.
In one embodiment of the present application, the first current determining unit specifically includes: the device comprises a second acquisition unit, a third prediction unit, a second current determination unit and a third current determination unit. Wherein:
The second acquisition unit is used for acquiring the maximum output current of the charging equipment, the initial electric quantity of the power battery and the initial charging current of the power battery; the initial power level refers to the power level of the power battery when the power battery is not charged.
The third prediction unit is used for predicting and obtaining the target electric quantity of the power battery after the predicted duration based on the initial charging current and the initial electric quantity; the predicted time period is used for describing the time period of the change of the battery temperature of the power battery.
And the second current determining unit is used for determining the standard charging current of the power battery after the predicted time period according to the target electric quantity and the target battery temperature.
The third current determining unit is configured to determine the target charging current according to the standard charging current and the maximum output current.
It should be noted that, because the content of information interaction and execution process between the above devices/units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Fig. 6 is a schematic structural diagram of a vehicle-mounted terminal according to an embodiment of the present application. As shown in fig. 6, the in-vehicle terminal 6 of this embodiment includes: at least one processor 60 (only one is shown in fig. 6), a memory 61 and a computer program 62 stored in the memory 61 and executable on the at least one processor 60, the processor 60 executing the computer program 62 implementing the steps in any of the respective battery temperature determination method embodiments described above.
The in-vehicle terminal may include, but is not limited to, a processor 60, a memory 61. It will be appreciated by those skilled in the art that fig. 6 is merely an example of the in-vehicle terminal 6 and is not intended to limit the in-vehicle terminal 6, and may include more or less components than illustrated, or may combine certain components, or different components, such as may also include input-output devices, network access devices, etc.
The Processor 60 may be a central processing unit (Central Processing Unit, CPU), the Processor 60 may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL processors, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may in some embodiments be an internal storage unit of the in-vehicle terminal 6, such as a memory of the in-vehicle terminal 6. The memory 61 may also be an external storage device of the in-vehicle terminal 6 in other embodiments, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD) or the like, which are provided on the in-vehicle terminal 6. Further, the memory 61 may also include both an internal storage unit and an external storage device of the in-vehicle terminal 6. The memory 61 is used for storing an operating system, application programs, boot loader (BootLoader), data, other programs, etc., such as program codes of the computer program. The memory 61 may also be used for temporarily storing data that has been output or is to be output.
Embodiments of the present application also provide a computer readable storage medium storing a computer program which, when executed by a processor, implements steps for implementing the various method embodiments described above.
Embodiments of the present application provide a computer program product that, when run on a vehicle-mounted terminal, enables the vehicle-mounted terminal to perform the steps of the method embodiments described above.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above-described embodiments, and may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of the method embodiments described above when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include at least: any entity or device capable of carrying the computer program code to the in-vehicle terminal, a recording medium, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, and a software distribution medium. Such as a U-disk, removable hard disk, magnetic or optical disk, etc. In some jurisdictions, computer readable media may not be electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A method of determining a temperature of a battery, the method comprising:
when a power battery of a vehicle is charged, acquiring environmental information of an area where the vehicle is located, state information of a thermal management system of the vehicle and battery information of the power battery;
determining the temperature change rate in the vehicle corresponding to the thermal management system based on the state information;
And predicting the target battery temperature of the power battery based on the environment information, the battery information and the temperature change rate in the vehicle.
2. The method of determining a battery temperature according to claim 1, wherein the state information includes an on state and an off state; the determining, based on the state information, a temperature change rate in the vehicle corresponding to the thermal management system includes:
determining that the in-vehicle temperature change rate is 0 when the thermal management system is in a closed state;
Determining a reference variation amplitude of the temperature in the vehicle in a historical time period when the thermal management system is in an on state; and determining the temperature change rate in the vehicle according to the reference change amplitude.
3. The method of determining a battery temperature according to claim 1, wherein the environmental information includes an off-vehicle temperature at each of the historical times in the historical period; the battery information comprises initial battery temperature, historical battery temperature at each historical time in the historical time period and current heat generation rate; the predicting, based on the environmental information, the battery information, and the in-vehicle temperature change rate, the target battery temperature of the power battery includes:
determining a first influence factor according to the outside temperature and the historical battery temperature at each historical time in the historical time period;
Determining a second influence factor according to the temperature change rate in the vehicle;
Determining a third influencing factor according to the battery heat generation rate;
and predicting the target battery temperature based on the first influence factor, the second influence factor and the third influence factor.
4. The method of determining a battery temperature according to claim 1, wherein the environmental information includes an off-vehicle temperature at each of the historical times in the historical period; the battery information comprises initial battery temperature, historical battery temperature at each historical time in the historical time period and current heat generation rate; the predicting, based on the environmental information, the battery information, and the in-vehicle temperature change rate, the target battery temperature of the power battery includes:
Traversing and calculating the temperature difference between the outside temperature and the historical battery temperature at the same historical time in the historical time period to obtain a temperature difference set;
Determining a temperature difference change rate based on the temperature difference set;
Determining the predicted time length of the battery temperature according to the state information; the predicted time period is used for describing the time period of the change of the battery temperature of the power battery;
And calculating to obtain the target battery temperature of the power battery after the predicted time according to the temperature difference change rate, the temperature change rate in the vehicle, the current heat generation rate and the initial battery temperature.
5. The method of determining a battery temperature according to claim 4, wherein the state information includes an on state and an off state; the opening state comprises a heating state and a refrigerating state; the determining the predicted time length of the battery temperature according to the state information comprises the following steps:
Determining a first time period as the predicted time period when the thermal management system is in the heating state;
determining a second duration as the predicted duration when the thermal management system is in the cooling state;
determining a third duration as a predicted duration when the thermal management system is in the off state; the third time period is longer than the second time period and the first time period.
6. The method according to any one of claims 1 to 5, characterized by further comprising, after said predicting a target battery temperature of the power battery based on the environmental information, the battery information, and the in-vehicle temperature change rate:
determining a target charging current of the power battery based on the target battery temperature;
And charging the power battery based on the charging current.
7. The method of determining a battery temperature according to claim 6, wherein the determining a target charging current of the power battery based on the target battery temperature includes:
obtaining the maximum output current of the charging equipment, the initial electric quantity of the power battery and the initial charging current of the power battery; the initial electric quantity refers to the electric quantity of the power battery when the power battery is not charged;
Predicting the target electric quantity of the power battery after the predicted duration based on the initial charging current and the initial electric quantity; wherein the predicted time period is used for describing the time period of the change of the battery temperature of the power battery;
Determining a standard charging current of the power battery after the predicted time period according to the target electric quantity and the target battery temperature;
the target charging current is determined from the standard charging current and the maximum output current.
8. A battery temperature determining apparatus, comprising:
a first obtaining unit, configured to obtain, when a power battery of a vehicle is being charged, environmental information of an area where the vehicle is located, state information of a thermal management system of the vehicle, and battery information of the power battery;
a first rate determining unit, configured to determine an in-vehicle temperature change rate corresponding to the thermal management system based on the state information;
And the first prediction unit is used for predicting and obtaining the target battery temperature of the power battery based on the environment information, the battery information and the temperature change rate in the vehicle.
9. A vehicle-mounted terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method of determining the battery temperature according to any one of claims 1 to 7 when executing the computer program.
10. A vehicle comprising the in-vehicle terminal according to claim 9.
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