CN112937370A

CN112937370A - Vehicle power battery heat preservation control method and device

Info

Publication number: CN112937370A
Application number: CN202110196279.5A
Authority: CN
Inventors: 张巍
Original assignee: Beijing CHJ Automotive Information Technology Co Ltd
Current assignee: Beijing CHJ Automotive Information Technology Co Ltd
Priority date: 2021-02-22
Filing date: 2021-02-22
Publication date: 2021-06-11
Also published as: WO2022174820A1

Abstract

The embodiment of the disclosure discloses a vehicle power battery heat preservation control method and device, and relates to the technical field of vehicle control. The main technical scheme of the embodiment of the disclosure comprises the following steps: determining a first temperature change rate and a second temperature change rate corresponding to a current scene of the vehicle, wherein the first temperature change rate represents the temperature change rate of the power battery when the vehicle is static, and the second temperature change rate represents the temperature change rate of the power battery when the vehicle is kept warm; determining the heat preservation starting time of the power battery based on the first temperature change rate, the second temperature change rate, the environment temperature of the environment where the vehicle is located, the travel starting time of the vehicle, the initial temperature of the power battery when the vehicle enters the standing state and the corresponding initial time when the vehicle enters the standing state; and controlling the power battery to keep warm based on the heat preservation starting time.

Description

Vehicle power battery heat preservation control method and device

Technical Field

The embodiment of the disclosure relates to the technical field of vehicle control, in particular to a method and a device for controlling heat preservation of a vehicle power battery.

Background

With the development of new energy automobiles, vehicles using power batteries as core energy sources are more and more widely applied in daily life of people, and the performance of the power batteries directly determines the overall performance of the vehicles. The performance of the power battery is greatly influenced by the temperature, if the temperature of the power battery is low, the available electric quantity of the power battery is reduced, the endurance mileage of a vehicle is reduced, the output power of the power battery is reduced, the power performance of the whole vehicle is influenced, and the performance of the vehicle, such as acceleration performance and climbing performance, is limited.

At present, in order to avoid the low temperature of the power battery, after the vehicle is charged, the power battery is subjected to heat preservation operation, and the heat preservation operation is generally to preserve the heat of the power battery for a fixed time. However, in this heat preservation method, the power battery is kept warm for a fixed period of time, and it cannot be guaranteed that the power battery is at a proper temperature when a user actually uses the vehicle.

Disclosure of Invention

In view of this, embodiments of the present disclosure provide a method and an apparatus for controlling heat preservation of a power battery of a vehicle, and mainly aim to control the heat preservation of the power battery at a proper time. The main technical scheme comprises:

in a first aspect, an embodiment of the present disclosure provides a vehicle power battery thermal insulation control method, including:

determining a first temperature change rate and a second temperature change rate corresponding to a current scene of the vehicle, wherein the first temperature change rate represents the temperature change rate of the power battery when the vehicle is static, and the second temperature change rate represents the temperature change rate of the power battery when the vehicle is kept warm;

determining the heat preservation starting time of the power battery based on the first temperature change rate, the second temperature change rate, the environment temperature of the environment where the vehicle is located, the travel starting time of the vehicle, the initial temperature of the power battery when the vehicle enters the standing state and the corresponding initial time when the vehicle enters the standing state;

and controlling the power battery to keep warm based on the heat preservation starting time.

In a second aspect, an embodiment of the present disclosure provides a vehicle power battery temperature protection and control device, including:

the first determining unit is used for determining a first temperature change rate and a second temperature change rate corresponding to the current scene of the vehicle, wherein the first temperature change rate represents the temperature change rate of the power battery when the vehicle is static, and the second temperature change rate represents the temperature change rate of the power battery when the vehicle is kept warm;

a second determination unit, configured to determine a heat preservation start time of the power battery based on the first temperature change rate, the second temperature change rate, an ambient temperature of an environment where the vehicle is located, a trip start time of the vehicle, an initial temperature of the power battery when the vehicle enters a stationary state, and an initial time corresponding to when the vehicle enters the stationary state;

and the control unit is used for controlling the heat preservation of the power battery based on the heat preservation starting time.

In a third aspect, an embodiment of the present disclosure provides a vehicle control system including: a controller; the controller executes the vehicle power battery heat preservation control method of the first aspect when in operation.

In a fourth aspect, embodiments of the present disclosure provide a vehicle comprising: a power battery and the vehicle control system of the third aspect;

and the power battery is used for preserving heat under the control of the vehicle control system.

According to the method and the device for controlling the heat preservation of the vehicle power battery, when the heat preservation of the vehicle power battery needs to be controlled, a first temperature change rate and a second temperature change rate corresponding to a current scene of a vehicle are determined, the first temperature change rate represents the temperature change rate of the power battery when the vehicle is in a standing state, and the second temperature change rate represents the temperature change rate of the power battery when the vehicle is in the heat preservation state. And then determining the heat preservation starting time of the power battery based on the first temperature change rate, the second temperature change rate, the environment temperature of the environment where the vehicle is located, the travel starting time of the vehicle, the initial temperature of the power battery when the vehicle enters the standing state and the corresponding initial time when the vehicle enters the standing state. And then controlling the power battery to keep warm according to the heat preservation starting time. Therefore, the temperature change rate of the vehicle corresponding to the current scene of the vehicle during standing and heat preservation can be determined, and the heat preservation start time of the power battery is obtained by combining the determined temperature change rate, the environment temperature of the environment where the vehicle is located, the initial temperature of the power battery when the vehicle enters the standing state, the travel start time of the vehicle and the initial time corresponding to the time when the vehicle enters the standing state. The heat preservation of the power battery of the vehicle is controlled at a proper time according to the heat preservation starting time, so that the temperature of the power battery can not influence the performance of the power battery when a user uses the vehicle, the electric energy consumed by heat preservation of the power battery can be reduced, and the heat preservation cost of the power battery is reduced.

The foregoing description is only an overview of the embodiments of the present disclosure, and in order to make the technical means of the embodiments of the present disclosure more clearly understood, the embodiments of the present disclosure may be implemented in accordance with the content of the description, and in order to make the foregoing and other objects, features, and advantages of the embodiments of the present disclosure more clearly understood, the following detailed description of the embodiments of the present disclosure is given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the embodiments of the present disclosure. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 shows a flow chart of a vehicle power battery thermal insulation control method provided by an embodiment of the disclosure;

fig. 2 is a block diagram illustrating a vehicle power battery temperature keeping control device according to an embodiment of the present disclosure;

fig. 3 shows a block diagram of another vehicle power battery temperature keeping control device provided by the embodiment of the disclosure.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

After the vehicle enters a standing state, the power battery needs to be kept warm to ensure that the temperature of the power battery can be kept at the temperature required by the performance of the power battery when a user uses the vehicle, so that the performance of the power battery is not influenced by the temperature of the external environment. The vehicle entering the stationary state may refer to when charging of a power battery of the vehicle is completed or the vehicle entering a parking state. The power battery needs to be insulated at a proper time, so that when a user uses the vehicle, the power battery is insulated at a proper temperature to enable the power battery to exert the performance of the power battery, and the performance of the whole vehicle is not affected. In addition, the power battery needs to be insulated at a proper time, and the electric energy loss caused by the fact that the power battery is in an overlong insulation state can be avoided. The embodiment of the disclosure is provided for controlling the heat preservation of the power battery at a proper time.

In a first aspect, an embodiment of the present disclosure provides a vehicle power battery thermal insulation control method, as shown in fig. 1, the method mainly includes:

101. a first rate of temperature change and a second rate of temperature change corresponding to a current scene of the vehicle are determined.

In practical applications, at least two of the following timings exist when determining the first temperature change rate and the second temperature change rate corresponding to the current scene of the vehicle: one is when the charging of the power battery of the vehicle is completed. The other is when the vehicle enters a parking state. In order to ensure that the power battery of the vehicle is at a proper temperature and exert the performance of the power battery when the vehicle is used, proper heat preservation starting time needs to be determined so as to preserve the heat of the power battery at the heat preservation starting time.

In order to determine the proper heat preservation time of the power battery, a first temperature change rate and a second temperature change rate corresponding to the current scene of the vehicle need to be determined. The first temperature change rate represents the temperature change rate of the power battery when the vehicle is in standing, and the second temperature change rate represents the temperature change rate of the power battery when the vehicle is kept warm. The vehicle is in a state of parking, locking after high voltage is cut off. The vehicle heat preservation refers to a state that a power battery of the vehicle is in a heat preservation state.

In the following, how to determine the first temperature change rate and the second temperature change rate corresponding to the current scene of the vehicle is described, the process includes the following steps one to two:

the method comprises the steps of firstly, inquiring a data table in which corresponding relations between a plurality of scenes and a plurality of first temperature change rates are recorded, and determining the first temperature change rate corresponding to the current scene of the vehicle, wherein each recorded first temperature change rate represents the average temperature change rate of the power battery in a future preset time period from a specific time point corresponding to the scene of the vehicle when the vehicle is in a standing state.

When determining the first temperature change rate, it is first necessary to determine a current scene of the vehicle, where the current scene of the vehicle may include one or more of the following: the temperature of the environment where the vehicle is located, the current position of the vehicle, the current month, the current time and the current temperature of the power battery.

When the current scene of the vehicle is determined, a data table in which a plurality of scenes and a plurality of first temperature change rate corresponding relations are recorded is inquired, and the data table can be obtained through big data statistics or data simulation. A scene corresponds to a first rate of temperature change in the data table.

The statistical procedure for this data table is explained below: firstly, counting data of a scene where a vehicle is in a static state and a temperature change rate of a power battery, wherein the scene of the statistical data is as follows: the statistical range of the ambient temperature is-20 ℃ to 30 ℃. The current position takes the longitude and latitude information of the GPS as the standard with statistical accuracy, and the province and city areas where the position is located are identified, wherein the province and city areas comprise 34 province-level administrative areas. The current month, namely the month in which the current day is located, such as month 5, has a statistical accuracy of 1 month, and ranges from 1 month to 12 months. The current time, namely the time of the day, such as 14 o' clock, has the statistical accuracy of 1 hour and ranges from 0 to 24 hours. The statistical range of the temperature of the power battery is-20 ℃ to 50 ℃. The temperature change rate of the power battery is within 12 hours from the current time, and the precision is 1 ℃/h. And after the statistical data are obtained, classifying the data according to the scene of the vehicle. And then, carrying out data classification according to the ambient temperature, the month of the vehicle standing time, the position of the vehicle standing position and the current temperature of the power battery to obtain the temperature change rate of the power battery when the vehicle stands under different scenes, and then determining the average value of the temperature change rate of the power battery corresponding to the same scene as the first temperature change rate corresponding to the scene.

Illustratively, as shown in table-1, table-1 describes a data table of a plurality of scenes corresponding to a plurality of first temperature change rates, which is an average change rate of the corresponding power battery temperature within 12 hours in the future, i.e., a first temperature change rate (in ℃/h), when the vehicle is left at rest at each ambient temperature and power battery temperature in 12 months in beijing.

TABLE-1

And secondly, inquiring a data table in which the corresponding relations between the plurality of scenes and the plurality of second temperature change rates are recorded, and determining the second temperature change rate corresponding to the current scene of the vehicle, wherein each recorded second temperature change rate respectively represents the average temperature change rate of the power battery in a future preset time period from a specific time point corresponding to the scene of the vehicle when the vehicle is kept warm.

When determining the second temperature change rate, it is first necessary to determine a current scene of the vehicle, which may include one or more of the following: the temperature of the environment where the vehicle is located, the current position of the vehicle, the current month, the current time and the current temperature of the power battery. It will be appreciated that the current scene of the vehicle used to determine the second rate of temperature change is identical to the current scene of the vehicle used to determine the first rate of temperature change.

When the current scene of the vehicle is determined, a data table in which the corresponding relations between the plurality of scenes and the plurality of second temperature change rates are recorded is inquired, and the data table can be obtained through big data statistics or data simulation. A scene in the data table corresponds to a second rate of temperature change.

The statistical procedure for this data table is explained below: firstly, statistics is carried out on a scene where a vehicle is in a heat preservation state and data of a temperature change rate of a power battery, wherein the scene of the statistics is as follows: the statistical range of the ambient temperature is-20 ℃ to 30 ℃. The current position takes the longitude and latitude information of the GPS as the standard with statistical accuracy, and the province and city areas where the position is located are identified, wherein the province and city areas comprise 34 province-level administrative areas. The current month, namely the month in which the current day is located, such as month 5, has a statistical accuracy of 1 month, and ranges from 1 month to 12 months. The current time, namely the time of the day, such as 14 o' clock, has the statistical accuracy of 1 hour and ranges from 0 to 24 hours. The statistical range of the temperature of the power battery is-20 ℃ to 50 ℃. The temperature change rate of the power battery is within 12 hours from the current time, and the precision is 1 ℃/h. And after the statistical data are obtained, classifying the data according to the scene of the vehicle. And then, carrying out data classification according to the environment temperature, the month of the vehicle standing time, the position of the vehicle standing position and the current temperature of the power battery, then obtaining the temperature change rate of the power battery when the vehicle is kept warm in different scenes, and then determining the average value of the temperature change rate of the power battery corresponding to the same scene as the second temperature change rate corresponding to the scene.

Illustratively, as shown in table-2, table-2 describes a data table of a plurality of scenes corresponding to a plurality of second temperature change rates, which is an average change rate of the corresponding power battery temperature in the future 12 hours, i.e., the second temperature change rate (in ℃/h), at 19 o' clock in 12 months of beijing city, when the vehicle is kept warm at each ambient temperature and power battery temperature.

TABLE-2

It should be noted that, since the first temperature change rate and the second temperature change rate are both indicative of an average temperature change rate of the power battery in a preset time period in the future from a specific time point of the vehicle, both are bases for predicting a heat preservation time period in which the power battery needs to be subjected to heat preservation.

102. And determining the heat preservation starting time of the power battery based on the first temperature change rate, the second temperature change rate, the environment temperature of the environment where the vehicle is located, the travel starting time of the vehicle, the initial temperature of the power battery when the vehicle enters the standing state and the corresponding initial time when the vehicle enters the standing state.

In practical applications, the determination method of the ambient temperature includes the following two methods:

firstly, when the vehicle enters a standing state, the corresponding environment temperature is the environment temperature used for finally determining the heat preservation starting time of the power battery.

Second, since the ambient temperature of the vehicle changes with time after the vehicle is stationary, the warm-keeping start time of the power battery is periodically required to determine the warm-keeping start time corresponding to the real-time ambient temperature of the vehicle. The environment temperature used in each period is the real-time environment temperature of the current period. And then determining the heat preservation starting time for finally controlling the heat preservation of the power battery according to the heat preservation starting time corresponding to each completed cycle.

For example, the heat preservation start time corresponding to each completed cycle shows the same trend, for example, the heat preservation start time is closer to or farther away from the travel start time of the vehicle, while the heat preservation start time corresponding to the latest cycle is opposite to the trend of the heat preservation start time of the previous cycle, and in order to ensure that the power battery is timely preserved heat, the heat preservation start time of the previous cycle adjacent to the latest cycle is determined as the heat preservation start time for finally controlling the heat preservation of the power battery.

The specific determination process for determining the heat-preservation start time of the power battery is the same for each time, regardless of the ambient temperature.

The specific determination process for determining the heat preservation starting time of the power battery is related to whether the heat preservation of the power battery is needed before the temperature of the power battery is equal to the ambient temperature, and different judgment results are used for determining the heat preservation starting time by different methods. The following describes a specific method for determining whether the power battery needs to be insulated before the temperature of the power battery is equal to the ambient temperature, and the method includes at least the following three methods:

first, it is determined whether or not the power battery needs to be kept warm before the temperature of the power battery and the ambient temperature are leveled, based on the first temperature change rate, the second temperature change rate, the ambient temperature of the environment where the vehicle is located, the travel start time of the vehicle, the initial temperature of the power battery when the vehicle enters a stationary state, and the initial time corresponding to the time when the vehicle enters a stationary state. The method can ensure that the power battery finishes heat preservation before the vehicle starts, so that the temperature of the power battery is maintained at the optimum temperature, the performance of the power battery is ensured, and the power performance of the whole vehicle is not influenced.

The specific process of the method comprises the following steps of:

step one, determining a fourth time length from the initial temperature to the environment temperature of the power battery according to the first temperature change rate, the initial temperature and the environment temperature.

Specifically, the fourth time period represents a time period required for the power battery to be heated or cooled from the initial temperature to the ambient temperature when the vehicle is stationary, and the determination process is as follows: a temperature difference between the ambient temperature and the initial temperature is determined, and a ratio of the resulting temperature difference to the first rate of temperature change is determined as the fourth duration.

The determination of the fourth time duration can be characterized by the following equation:

wherein, t₄Characterizing a fourth duration; t is_airCharacterizing the ambient temperature; t is₀Characterizing the initial temperature; k is a radical of₁A first rate of temperature change is characterized.

And step two, determining a fifth time length from the initial temperature to the target temperature of the power battery according to the second temperature change rate, the target temperature and the ambient temperature.

Specifically, if the power battery is kept warm, in order to maintain the performance of the power battery in the optimal state, a target temperature needs to be set, wherein the target temperature is a preset temperature reached after the power battery is kept warm and is a maintaining temperature after the power battery is kept warm.

Specifically, the setting method of the target temperature at least comprises the following steps: first, the target temperature is determined by the manufacturer based on the performance of the power battery when the vehicle leaves the factory, and is constant no matter what scene the vehicle is in. The second is that the target temperature is determined by the scene of the vehicle when the vehicle is stationary, and different scenes correspond to different target temperatures. The target temperature in this case varies with the vehicle scene, so that the performance of the power battery after heat preservation corresponds to the scene where the vehicle is located. And thirdly, the target temperature is determined based on the driving habits of the vehicle users, namely, after the power battery is insulated to the target temperature, the output power of the power battery can ensure that the overall performance of the vehicle meets the driving habits of the users. By the mode, the heat preservation control can be performed on the vehicle power battery based on the driving habit of a vehicle user. For example, the target temperature may be set lower when the user demands lower power from the vehicle, and the target temperature may be set higher when the user demands higher power from the vehicle.

Specifically, when the vehicle represented by the fifth time length is kept warm, the time length required for the power battery to be heated or cooled from the initial temperature to the target temperature is as follows: and determining the temperature difference between the target temperature and the ambient temperature, and determining the ratio of the obtained temperature difference to the second temperature change rate as a fifth time period for the power battery to be heated or cooled from the initial temperature to the target temperature.

The determination of the fifth duration may be characterized by the following equation:

wherein, t₅Characterizing a fifth duration; t is₂Characterizing a target temperature; t is_airCharacterizing the ambient temperature; k is a radical of₂The second rate of temperature change is characterized.

And step three, determining the target duration according to the time difference between the travel starting time and the initial time.

Specifically, the target time period is a time interval from when the vehicle enters the stationary state to when the vehicle departs, which is determined by a time difference between the trip start time and an initial time corresponding to when the vehicle enters the stationary state.

Specifically, the trip start time may be determined in two ways: first, the user sets a desired travel start time, which the user can set by means of terminal input or voice input, while charging the power battery or after parking the vehicle. Secondly, by counting the journey starting time of the user in the preset time period and the estimated journey starting time, the method does not need manual input of the user, and can automatically set the journey starting time according to the journey habits of the user.

And step four, determining the sum of the fourth time length and the fifth time length, judging whether the difference value between the target time length and the sum is greater than a preset threshold value, and executing step five or step six.

And fifthly, if the temperature of the power battery is not higher than the ambient temperature, determining that the power battery needs to be insulated before the temperature of the power battery is equal to the ambient temperature.

Specifically, the fourth time period represents the time period required for the power battery to be heated or cooled from the initial temperature to the ambient temperature when the vehicle is stationary. And when the vehicle represented by the fifth time length is kept warm, the time length required for the power battery to be heated or cooled from the initial temperature to the target temperature is prolonged.

Specifically, the sum of the fourth time length and the fifth time length is determined, if the difference between the target time length and the sum is not greater than a preset threshold value, it is indicated that the power battery needs to be kept warm before the power battery is heated or cooled from an initial temperature to an ambient temperature when the vehicle is in a standing state, otherwise, when a user uses the vehicle, the power battery cannot be kept warm to the target temperature, and it is determined that the power battery needs to be kept warm before the temperature of the power battery is equal to the ambient temperature.

And step six, if the temperature of the power battery is higher than the ambient temperature, determining that the power battery does not need to be insulated before the temperature of the power battery is equal to the ambient temperature.

Specifically, the sum of the fourth time length and the fifth time length is determined, if the difference between the target time length and the sum is greater than a preset threshold value, the power battery is heated or cooled from an initial temperature to an ambient temperature when the power battery vehicle is in a standing state, the power battery is in a standing state at the ambient temperature for a period of time, and at the moment, in order to reduce the electric quantity consumption, it is determined that the power battery does not need to be kept warm until the temperature of the power battery is equal to the ambient temperature.

Secondly, determining whether the current electric quantity of the power battery is larger than a preset electric quantity threshold value; if so, determining that the power battery needs to be insulated before the temperature of the power battery is equal to the ambient temperature; if not, determining that the power battery does not need to be insulated before the temperature of the power battery is equal to the ambient temperature.

When the current electric quantity of the power battery is determined to be larger than the preset electric quantity threshold value, it is indicated that the power battery has enough electric quantity to preserve heat for the power battery, and the electric quantity consumed by the heat preservation does not affect the normal use of the vehicle.

When the current electric quantity of the power battery is determined to be not more than the preset electric quantity threshold value, the electric quantity of the power battery is not enough, in order to preferentially ensure the normal use of the vehicle, the heat preservation of the power battery is determined not to be needed before the temperature of the power battery is leveled with the ambient temperature, so that the heat preservation of the power battery is carried out after the temperature of the vehicle is reduced to the ambient temperature, and the electric quantity consumed by the heat preservation of the power battery can be saved under the condition.

Thirdly, whether a heat preservation instruction is received or not is determined, wherein the heat preservation instruction is used for representing that a user expects to preserve heat of the power battery before the temperature of the power battery is equal to the ambient temperature; if so, determining that the power battery needs to be insulated before the temperature of the power battery is equal to the ambient temperature; if not, determining that the power battery does not need to be insulated before the temperature of the power battery is equal to the ambient temperature.

The heat preservation instruction user can be manually input through a vehicle machine in the vehicle, can also be input through a terminal connected with the vehicle, and can also be input through the vehicle machine voice in the vehicle. The heat preservation instruction is used for representing that a user expects to preserve heat of the power battery between the temperature of the power battery and the ambient temperature.

When the heat preservation instruction is received, the user pays more attention to the performance of the power battery, so that the power battery is required to be subjected to heat preservation before the temperature of the power battery is equal to the ambient temperature, and the power battery can be ensured to be at a proper temperature in time and be subjected to heat preservation in time.

If the heat preservation instruction is not received, the user pays more attention to the heat preservation electric quantity consumption of the power battery, and the power battery does not need to be subjected to heat preservation before the temperature of the power battery is equal to the ambient temperature.

The following describes a specific process for determining the heat preservation start time of the power battery when it is determined that the heat preservation of the power battery is required before the temperature of the power battery is leveled with the ambient temperature, the process including the following steps one to five:

step one, determining a target duration based on a time difference between the travel starting time and the initial time.

Specifically, the target time period is a time interval from when the vehicle enters the stationary state to when the vehicle departs, which is determined by a time difference between the trip start time and an initial time corresponding to when the vehicle enters the stationary state. And the operation of keeping the temperature of the power battery is carried out within the target time length.

And secondly, determining the expected temperature of the power battery under the influence of the ambient temperature according to the first temperature change rate, the second temperature change rate, the initial temperature, the target temperature and the target duration.

Specifically, when the vehicle enters the standing state, the vehicle will stand at the initial temperature when entering the standing state, and after standing for a period of time, the temperature of the power battery will be raised or lowered to the expected temperature under the influence of the ambient temperature. The expected temperature is a temperature between the initial temperature and the ambient temperature. Since the power battery needs to be kept warm before the temperature of the power battery is equal to the ambient temperature, the expected temperature is not equal to the ambient temperature.

The predicted temperature can be calculated by the following equation:

wherein, T₁Characterizing the predicted temperature; k is a radical of₁Characterizing the first rate of temperature change; k is a radical of₂Characterizing the second rate of temperature change; t represents the target duration; t is₂Characterizing the target temperature; t is₀Characterizing the initial temperature.

The following describes the determination of the calculation formula of the expected temperature:

since the power battery needs to be kept warm before the temperature of the power battery is equal to the ambient temperature, the target time period t is equal to the sum of the following two time periods: one duration being a first duration t₁And the first time period is the time period required for the power battery to be heated or cooled from the initial temperature to the predicted temperature. The other time is the duration t required by the power battery to raise or lower the temperature from the predicted temperature to the target temperature₁'. The target duration is expressed by formula one as: t is t₁+t₁′。

When the power battery is heated or cooled to the predicted temperature from the initial temperature within the first time period, the power battery is not insulated, and the temperature of the power battery changes at a first temperature change rate k₁At a first time period t₁From an initial temperature T₀Raising or lowering the temperature to the desired temperature T₁Expressed by formula two: t is₁＝T₀+k₁t₁。

When the temperature of the power battery is increased or decreased to the target temperature from the predicted temperature within the duration, the power battery is kept warm, and the temperature of the power battery is changed at a second temperature change rate k₂At duration t₁Within, from the predicted temperature T₁Heating or cooling to a target temperature T₂Expressed by the formula three: t is₂＝T₁+k₂t₁′。

And based on the relation from the first formula to the third formula, the calculation formula of the predicted temperature can be obtained through arrangement.

And step three, determining a first time length required by the power battery from the initial temperature to the expected temperature according to the expected temperature, the initial temperature and the first temperature change rate.

The first time length is determined by the following steps: determining a temperature difference value between the predicted temperature and the ambient temperature, and determining a ratio of the determined temperature difference value to a first temperature change rate as a first time period required for the power battery to be heated or cooled from the initial temperature to the predicted temperature.

The determination of the first duration may be expressed by the following equation:

wherein, t₁Characterizing a first duration; t is₁Representing the predicted temperature of the power battery after temperature rise or temperature drop under the influence of the environmental temperature; t is₀Characterizing the initial temperature; k is a radical of₁Characterizing the first rate of temperature change.

And step four, determining the difference between the target time length and the first time length as the heat preservation time length of the power battery.

Because the temperature of the power battery needs to be kept warm before being leveled with the ambient temperature, the power battery needs to be kept warm when the temperature of the power battery is raised or lowered from the initial temperature to the predicted temperature, otherwise, when a user uses the vehicle, the power battery cannot be kept warm to the target temperature, and the performance of the power battery is influenced.

In order to ensure that the power battery is kept at the target temperature when the user uses the vehicle, the difference value between the target time length and the first time length is determined as the heat preservation time length of the power battery, and the heat preservation time length is the time length of the heat preservation process of the battery.

And fifthly, determining the heat preservation starting time based on the heat preservation duration, the stroke starting time and the initial time.

The specific implementation process of the step comprises the following steps: determining a target duration based on a time difference between the trip start time and the initial time; determining the difference between the target time length and the heat preservation time length as the heat preservation waiting time length; and determining the heat preservation starting time according to the initial time and the heat preservation waiting time.

Specifically, after the target duration and the heat preservation duration are determined, the difference between the target duration and the heat preservation duration is the heat preservation waiting duration, and the power battery does not preserve heat in the heat preservation waiting duration and only waits for heat preservation operation. When the vehicle enters a standing state, the power battery is not directly insulated, but is insulated after the insulation waiting time, so that the insulation electric energy consumption of the power battery can be reduced.

And determining the heat preservation starting time according to the initial time and the heat preservation waiting time. And then controlling the power battery to keep the temperature when the current time reaches the heat preservation starting time.

Further, in order to reduce the energy consumption of the vehicle, it is necessary to determine whether the heat preservation waiting time is greater than a preset threshold. If the heat preservation waiting time length is judged to be greater than the preset threshold value, the power battery needs to be preserved heat after waiting for a longer time length, the vehicle is controlled to enter a dormant state at the moment so as to reduce the energy consumption of the vehicle, and the vehicle is awakened to control the heat preservation of the power battery when the current time reaches the heat preservation starting time. If the heat preservation waiting time length is judged to be not more than the preset threshold value, the fact that the power battery needs to be preserved when the power battery is invalid and waits for a longer time length is indicated, at the moment, in order to simplify operation, the vehicle does not need to be controlled to enter a dormant state, and when the current time reaches the heat preservation starting time, the power battery is controlled to be preserved.

The following describes a specific process for determining the heat preservation start time of the power battery when it is determined that the heat preservation of the power battery is not required before the temperature of the power battery is leveled with the ambient temperature, the process including the following steps one to five:

And secondly, determining a third time length required by the power battery from the initial temperature to the ambient temperature according to the ambient temperature, the initial temperature and the first temperature change rate.

The third duration is determined by the following process: and determining a temperature difference value between the environment temperature and the initial temperature, and determining a ratio of the determined temperature difference value to the first temperature change rate as a third time length required for the power battery to be cooled or heated from the initial temperature to the environment temperature. This process can be expressed by the following formula:

wherein, t₂Characterizing a third duration; t is_airCharacterizing the ambient temperature; t is₀Characterizing the initial temperature; k is a radical of₁Characterizing the first rate of temperature change.

And step three, determining a second time length required by the power battery from the ambient temperature to the target temperature according to the target temperature, the ambient temperature and the second temperature change rate.

When the temperature of the power battery is reduced or increased to the ambient temperature from the initial temperature, the power battery stands still at the ambient temperature, and the power battery is kept warm by the ambient temperature of the power battery after being reduced or increased.

The second duration is determined by the following process: and determining a temperature difference value between the target temperature and the ambient temperature, and determining a ratio of the determined temperature difference value to a second temperature change rate as a second time length required for the power battery to be heated or cooled from the ambient temperature to the target temperature. This process can be expressed by the following formula:

wherein, t₃Characterizing a second duration; t is₂Characterizing the target temperature; the T is_airCharacterizing the ambient temperature; k is a radical of₂Characterizing the second rate of temperature change.

And step four, determining the sum of the second time length and the third time length, and determining whether the difference value of the target time length and the sum is greater than a preset time length threshold value.

The difference between the target time length and the sum is the time length of the power battery maintained at the ambient temperature, and the power battery does not need to be kept warm in the time length.

The purpose of determining whether the difference is greater than the preset time threshold value is to determine whether the power battery is maintained at the target temperature when the temperature of the power battery is not required to be kept equal to the ambient temperature before the temperature of the power battery is leveled with the ambient temperature.

And if the difference is determined to be greater than the preset time threshold, determining that the second time is the heat preservation time of the power battery, wherein the heat preservation time can ensure that the power battery is maintained at the target temperature when the vehicle is used.

If the difference is not greater than the preset time threshold, it is indicated that the power battery does not need to be kept warm before the temperature of the power battery is equal to the ambient temperature, and the power battery cannot be maintained at the target temperature when the vehicle is used, so that a user needs to be notified.

Step five: and determining the heat preservation starting time based on the heat preservation duration, the stroke starting time and the initial time.

103. And controlling the power battery to keep warm based on the heat preservation starting time.

And after the heat preservation starting time is determined, automatically controlling the power battery to preserve heat when the current time reaches the heat preservation starting time.

Furthermore, after the heat preservation of the power battery is carried out, if the time reaches the starting time of the travel of the vehicle, the heat preservation operation of the power battery is automatically quitted, and at the moment, the heat preservation of the power battery is enough to ensure the normal performance of the power battery, and the performance of the whole vehicle cannot be influenced.

According to the heat preservation control method for the vehicle power battery, when the heat preservation of the vehicle power battery needs to be controlled, a first temperature change rate and a second temperature change rate corresponding to a current scene of a vehicle are determined, the first temperature change rate represents the temperature change rate of the power battery when the vehicle is in standing, and the second temperature change rate represents the temperature change rate of the power battery when the vehicle is in heat preservation. And then determining the heat preservation starting time of the power battery based on the first temperature change rate, the second temperature change rate, the environment temperature of the environment where the vehicle is located, the travel starting time of the vehicle, the initial temperature of the power battery when the vehicle enters the standing state and the corresponding initial time when the vehicle enters the standing state. And then controlling the power battery to keep warm according to the heat preservation starting time. Therefore, the temperature change rate of the vehicle corresponding to the current scene of the vehicle during standing and heat preservation can be determined, and the heat preservation start time of the power battery is obtained by combining the determined temperature change rate, the environment temperature of the environment where the vehicle is located, the initial temperature of the power battery when the vehicle enters the standing state, the travel start time of the vehicle and the initial time corresponding to the time when the vehicle enters the standing state. The heat preservation of the power battery of the vehicle is controlled at a proper time according to the heat preservation starting time, so that the temperature of the power battery can not influence the performance of the power battery when a user uses the vehicle, the electric energy consumed by heat preservation of the power battery can be reduced, and the heat preservation cost of the power battery is reduced.

In a second aspect, according to the method shown in fig. 1, another embodiment of the present disclosure further provides a vehicle power battery temperature protection and control device, as shown in fig. 2, the device mainly includes:

the first determining unit 21 is configured to determine a first temperature change rate and a second temperature change rate corresponding to a current scene of the vehicle, where the first temperature change rate represents a temperature change rate of the power battery when the vehicle is stationary, and the second temperature change rate represents a temperature change rate of the power battery when the vehicle is kept warm;

a second determining unit 22, configured to determine a heat preservation start time of the power battery based on the first temperature change rate, the second temperature change rate, an ambient temperature of an environment where the vehicle is located, a trip start time of the vehicle, an initial temperature of the power battery when the vehicle enters a stationary state, and an initial time corresponding to when the vehicle enters the stationary state;

and the control unit 23 is used for controlling the heat preservation of the power battery based on the heat preservation starting time.

When the heat preservation of the vehicle power battery needs to be controlled, a first temperature change rate and a second temperature change rate corresponding to the current scene of the vehicle are determined, the first temperature change rate represents the temperature change rate of the power battery when the vehicle is in a standing state, and the second temperature change rate represents the temperature change rate of the power battery when the vehicle is in the heat preservation state. And then determining the heat preservation starting time of the power battery based on the first temperature change rate, the second temperature change rate, the environment temperature of the environment where the vehicle is located, the travel starting time of the vehicle, the initial temperature of the power battery when the vehicle enters the standing state and the corresponding initial time when the vehicle enters the standing state. And then controlling the power battery to keep warm according to the heat preservation starting time. Therefore, the temperature change rate of the vehicle corresponding to the current scene of the vehicle during standing and heat preservation can be determined, and the heat preservation start time of the power battery is obtained by combining the determined temperature change rate, the environment temperature of the environment where the vehicle is located, the initial temperature of the power battery when the vehicle enters the standing state, the travel start time of the vehicle and the initial time corresponding to the time when the vehicle enters the standing state. The heat preservation of the power battery of the vehicle is controlled at a proper time according to the heat preservation starting time, so that the temperature of the power battery can not influence the performance of the power battery when a user uses the vehicle, the electric energy consumed by heat preservation of the power battery can be reduced, and the heat preservation cost of the power battery is reduced.

In some embodiments, as shown in fig. 3, the second determination unit 22 includes:

a first determination module 221, configured to determine a target duration based on a time difference between the stroke start time and the initial time when it is determined that the power battery needs to be kept warm before the temperature of the power battery is leveled with the ambient temperature;

a second determining module 222, configured to determine, according to the first temperature change rate, the second temperature change rate, the initial temperature, a target temperature, and the target duration, an expected temperature that the power battery reaches under the influence of the ambient temperature, where the expected temperature is a temperature between the initial temperature and the ambient temperature, and the target temperature is a preset temperature that the power battery reaches after being kept warm;

a third determining module 223, configured to determine, according to the predicted temperature, the initial temperature, and the first temperature change rate, a first time period required by the power battery to reach the predicted temperature from the initial temperature;

a fourth determining module 224, configured to determine a difference between the target time duration and the first time duration as a heat preservation time duration of the power battery; and determining the heat preservation starting time based on the heat preservation duration, the stroke starting time and the initial time.

In some embodiments, as shown in FIG. 3, a second determination module 222 for determining the expected temperature by the following formula;

the formula is:

In some embodiments, as shown in fig. 3, a third determining module 223 for determining a temperature difference between the expected temperature and the ambient temperature; determining a ratio between the temperature difference and the first rate of temperature change as the first duration.

a fifth determining module 225, configured to determine, according to a target temperature, the ambient temperature, and the second temperature change rate, a second time period required by the power battery to reach the target temperature from the ambient temperature, where the target temperature is a preset temperature reached after the power battery is kept warm;

a sixth determining module 226, configured to determine that the second duration is a duration of the heat preservation of the power battery;

a seventh determining module 227, configured to determine the heat preservation start time based on the heat preservation time period, the stroke start time, and the initial time.

In some embodiments, as shown in fig. 3, the second determining unit 22 further includes:

an eighth determining module 228, configured to determine a target duration based on a time difference between the trip start time and the initial time; determining a third time length required by the power battery from the initial temperature to the ambient temperature according to the ambient temperature, the initial temperature and the first temperature change rate; determining a sum of the second duration and the third duration; determining whether the difference value between the target time length and the sum is greater than a preset time length threshold value; if the second time length is greater than the first time length, the sixth determining module 226 is triggered to determine that the second time length is the heat preservation time length of the power battery.

In some embodiments, as shown in fig. 3, a sixth determining module 226 for determining a temperature difference between the ambient temperature and the initial temperature; determining a ratio between the temperature difference and the first rate of temperature change as the second duration.

In some embodiments, as shown in fig. 3, a seventh determining module 227 for determining a temperature difference between the target temperature and the ambient temperature; determining a ratio between the temperature difference and the second rate of temperature change as the third duration.

a ninth determining module 229, configured to determine whether to keep the temperature of the power battery warm before the temperature of the power battery is leveled with the ambient temperature based on the first temperature change rate, the second temperature change rate, the ambient temperature of the environment where the vehicle is located, the travel start time of the vehicle, the initial temperature of the power battery when the vehicle enters a stationary state, and the initial time corresponding to the time when the vehicle enters the stationary state.

In some embodiments, as shown in fig. 3, the ninth determining module 229 is specifically configured to determine a fourth time period from the initial temperature to the ambient temperature of the power battery according to the first temperature change rate, the initial temperature and the ambient temperature; determining a fifth time length from the initial temperature to the target temperature of the power battery according to the second temperature change rate, the target temperature and the environment temperature; determining a target duration according to the time difference between the travel starting time and the initial time; determining the sum of the fourth time length and the fifth time length, and judging whether the difference value between the target time length and the sum is greater than a preset threshold value; if the temperature of the power battery is not higher than the ambient temperature, determining that the power battery needs to be insulated before the temperature of the power battery is equal to the ambient temperature; and if so, determining that the power battery does not need to be insulated before the temperature of the power battery is equal to the ambient temperature.

In some embodiments, as shown in fig. 3, a ninth determining module 229 for determining a temperature difference between the ambient temperature and the initial temperature; determining a ratio between the temperature difference and the first rate of temperature change as the fourth duration.

In some embodiments, as shown in fig. 3, a ninth determining module 229 for determining a temperature difference between the target temperature and the ambient temperature; determining a ratio between the temperature difference and the second temperature change rate as the fifth duration.

a tenth determining module 230, configured to determine whether the current electric quantity of the power battery is greater than a preset electric quantity threshold; if so, determining that the power battery needs to be insulated before the temperature of the power battery is equal to the ambient temperature; if not, determining that the power battery does not need to be insulated before the temperature of the power battery is equal to the ambient temperature.

an eleventh determining module 231, configured to determine whether a warm-keeping instruction is received, where the warm-keeping instruction is used to indicate that a user desires to warm the power battery before the temperature of the power battery is leveled with the ambient temperature; if so, determining that the power battery needs to be insulated before the temperature of the power battery is equal to the ambient temperature; if not, determining that the power battery does not need to be insulated before the temperature of the power battery is equal to the ambient temperature.

In some embodiments, as shown in FIG. 3, a fourth determination module 224 or an eighth determination module 228 for determining a target duration based on a time difference between the start of travel time and the initial time; determining the difference between the target time length and the heat preservation time length as the heat preservation waiting time length; and determining the heat preservation starting time according to the initial time and the heat preservation waiting time.

In some embodiments, as shown in fig. 3, the control unit 24 is further configured to determine whether the heat preservation waiting time period is greater than a preset threshold; and if so, controlling the vehicle to enter a dormant state, and awakening the vehicle to control the power battery to preserve heat when the current time is detected to reach the heat preservation starting time.

In some embodiments, as shown in fig. 3, the first temperature change rate and the second temperature change rate related to the apparatus both have corresponding scenes, and both represent an average temperature change rate of the power battery in a preset time period in the future from a specific time point corresponding to the scene; wherein the scene comprises one or more of the following: the temperature of the environment in which the vehicle is located, the current position of the vehicle, the current month, the current time and the current temperature of the power battery.

The vehicle power battery temperature keeping control device provided by the embodiment of the second aspect may be used to execute the vehicle power battery temperature keeping control method provided by the embodiment of the first aspect, and the related meanings and specific implementation manners may be referred to the related descriptions in the embodiment of the first aspect, and will not be described in detail herein.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, embodiments of the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A vehicle power battery heat preservation control method is characterized by comprising the following steps:

2. The method of claim 1, wherein when it is determined that a warm-up of the power battery is required before the temperature of the power battery is leveled with the ambient temperature, determining a warm-up start time of the power battery comprises:

determining a target duration based on a time difference between the trip start time and the initial time;

determining a predicted temperature reached by the power battery under the influence of the environmental temperature according to the first temperature change rate, the second temperature change rate, the initial temperature, a target temperature and the target duration, wherein the predicted temperature is a temperature between the initial temperature and the environmental temperature, and the target temperature is a preset temperature reached by the power battery in a heat preservation mode;

determining a first time length required by the power battery from the initial temperature to the expected temperature according to the expected temperature, the initial temperature and the first temperature change rate;

determining the difference value between the target time length and the first time length as the heat preservation time length of the power battery;

and determining the heat preservation starting time based on the heat preservation duration, the stroke starting time and the initial time.

3. The method of claim 2, wherein determining the projected temperature comprises:

determining the predicted temperature by the following formula;

the formula is:

4. The method of claim 2, wherein determining a first time period required for the power cell to move from the initial temperature to the projected temperature comprises:

determining a temperature difference between the projected temperature and the ambient temperature;

determining a ratio between the temperature difference and the first rate of temperature change as the first duration.

5. The method of claim 1, wherein determining a warm-up start time for the power cell when it is determined that warm-up of the power cell is not required before the temperature of the power cell is leveled with the ambient temperature comprises:

determining a second time required by the power battery from the ambient temperature to the target temperature according to the target temperature, the ambient temperature and the second temperature change rate, wherein the target temperature is a preset temperature reached after the power battery is kept warm;

determining the second time length as the heat preservation time length of the power battery;

6. The method of claim 5, wherein prior to determining that the second duration is an incubation duration for the power cell, the method further comprises:

determining a third time length required by the power battery from the initial temperature to the ambient temperature according to the ambient temperature, the initial temperature and the first temperature change rate;

determining a sum of the second duration and the third duration;

determining whether the difference value between the target time length and the sum is greater than a preset time length threshold value;

and if so, determining that the second time length is the heat preservation time length of the power battery.

7. The method of claim 6, wherein determining a third time period required for the power cell to move from the initial temperature to the ambient temperature comprises:

determining a temperature difference between the ambient temperature and the initial temperature;

determining a ratio between the temperature difference and the first rate of temperature change as the third duration.

8. The method of claim 5, wherein determining a second period of time required for the power cell to move from the ambient temperature to the target temperature comprises:

determining a temperature difference between the target temperature and the ambient temperature;

determining a ratio between the temperature difference and the second rate of temperature change as the second duration.

9. The method according to claim 2 or 5, characterized in that the method further comprises:

and determining whether the power battery needs to be insulated before the temperature of the power battery is equal to the ambient temperature or not based on the first temperature change rate, the second temperature change rate, the ambient temperature of the environment where the vehicle is located, the travel starting time of the vehicle, the initial temperature of the power battery when the vehicle enters the standing state and the initial time corresponding to the time when the vehicle enters the standing state.

10. The method of claim 9, wherein determining whether the power cell needs to be warmed before the temperature of the power cell is leveled with the ambient temperature comprises:

determining a fourth time length from the initial temperature to the environment temperature of the power battery according to the first temperature change rate, the initial temperature and the environment temperature;

determining a fifth time length from the initial temperature to the target temperature of the power battery according to the second temperature change rate, the target temperature and the environment temperature;

determining a target duration according to the time difference between the travel starting time and the initial time;

determining the sum of the fourth time length and the fifth time length, and judging whether the difference value between the target time length and the sum is greater than a preset threshold value;

if the temperature of the power battery is not higher than the ambient temperature, determining that the power battery needs to be insulated before the temperature of the power battery is equal to the ambient temperature;

and if so, determining that the power battery does not need to be insulated before the temperature of the power battery is equal to the ambient temperature.

11. The method of claim 10, wherein determining a fourth time period for the power cell to move from the initial temperature to the ambient temperature comprises:

determining a ratio between the temperature difference and the first rate of temperature change as the fourth duration.

12. The method of claim 10, wherein determining a fifth time period for the power cell to move from the initial temperature to the target temperature comprises:

determining a ratio between the temperature difference and the second temperature change rate as the fifth duration.

13. The method according to claim 2 or 5, characterized in that the method further comprises:

determining whether the current electric quantity of the power battery is larger than a preset electric quantity threshold value;

if so, determining that the power battery needs to be insulated before the temperature of the power battery is equal to the ambient temperature;

if not, determining that the power battery does not need to be insulated before the temperature of the power battery is equal to the ambient temperature.

14. The method according to claim 2 or 5, characterized in that the method further comprises:

determining whether a heat preservation instruction is received, wherein the heat preservation instruction is used for representing that a user expects to preserve heat of the power battery before the temperature of the power battery is leveled with the ambient temperature;

15. The method of any of claims 1-7, wherein determining the soak start time based on the soak period, the start of travel time, and the initial time comprises:

determining the difference between the target time length and the heat preservation time length as the heat preservation waiting time length;

and determining the heat preservation starting time according to the initial time and the heat preservation waiting time.

16. The method of claim 15, further comprising:

judging whether the heat preservation waiting time length is greater than a preset threshold value or not;

and if so, controlling the vehicle to enter a dormant state, and awakening the vehicle to control the power battery to preserve heat when the current time is detected to reach the heat preservation starting time.

17. The method according to any one of claims 1-7, wherein the first temperature change rate and the second temperature change rate both have corresponding scenes and both represent average temperature change rates of the power battery within a preset time period in the future from a specific time point corresponding to the scenes; wherein the scene comprises one or more of the following: the temperature of the environment in which the vehicle is located, the current position of the vehicle, the current month, the current time and the current temperature of the power battery.

18. A vehicle power battery temperature protection and control device, characterized in that the device comprises:

19. A vehicle control system, characterized by comprising: a controller; the controller executes the vehicle power battery temperature keeping control method according to any one of claims 1 to 17 when operating.

20. A vehicle, characterized in that the vehicle comprises: a power battery and the vehicle control system of claim 18;