CN114976375A - Battery end-of-use temperature estimation method, device, vehicle and storage medium - Google Patents

Abstract

The application provides a battery use termination temperature estimation method, a battery use termination temperature estimation device, a vehicle and a storage medium. The method comprises the following steps: acquiring the current journey information; acquiring the battery initial temperature and the environment initial temperature of the current journey; determining a battery temperature rise gain value of the current trip according to the current trip information, the battery initial temperature and the environment initial temperature; and determining the estimated value of the use termination temperature of the battery at the end of the current stroke according to the battery temperature rise gain value, the battery initial temperature and the environment initial temperature of the current stroke. This application can estimate according to this journey information, can the operating mode of this journey of self-adaptation, does not rely on special operating mode, can improve the accuracy of estimating the use termination temperature of battery.

Description

Battery end-of-use temperature estimation method, device, vehicle and storage medium

technical field

The present application relates to the technical field of electric vehicles, and in particular, to a battery end-of-use temperature estimation method, device, vehicle, and storage medium.

Background technique

In the battery management system, the power performance that the battery can provide is related to the end temperature of the battery. The end-of-life temperature of the battery is the temperature of the battery at the end of the trip of the electric vehicle. Since the battery is usually a battery pack, the temperature of the battery can be the average temperature of the battery pack. Accurately estimating the end-of-use temperature of the battery is beneficial to reasonably set the correction coefficient in the vehicle control strategy, realize smooth control of the whole process, and improve user experience.

At present, the average temperature rise level under special operating conditions is usually used to estimate the end-of-service temperature of the battery. However, due to the complex and changeable driving conditions in the actual driving process, the result of using this method to estimate the end-of-use temperature of the battery is inaccurate.

SUMMARY OF THE INVENTION

The present application provides a method, device, vehicle and storage medium for estimating the end-of-use temperature of a battery, so as to solve the problem of inaccurate results of estimating the end-of-use temperature of the battery.

In a first aspect, the present application provides a method for estimating the end-of-use temperature of a battery, including:

Get this trip information;

Obtain the starting temperature of the battery and the starting temperature of the environment for this trip;

Determine the battery temperature rise gain value of this trip according to the current trip information, battery starting temperature and ambient starting temperature;

The estimated value of the end-of-use temperature of the battery at the end of the current trip is determined according to the battery temperature rise gain value, the initial battery temperature, and the initial ambient temperature of the current trip.

In a possible implementation manner, the current trip information includes the total mileage of the trip, the mileage corresponding to each road type in this trip, and the mileage corresponding to each road speed limit type in this trip;

Determine the battery temperature rise gain value of this trip according to the current trip information, battery starting temperature and ambient starting temperature, including:

Determine the temperature rise gain value of each road type in this trip and the temperature rise gain value of each road speed limit type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment;

According to the total mileage of this trip, the mileage corresponding to each road type in this trip, and the temperature rise gain value of each road type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment, determine the The total temperature rise gain value of the road type;

According to the total mileage of this trip, the mileage corresponding to each road speed limit type in this trip, and the temperature rise gain value of each road speed limit type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment, determine The total temperature rise gain value of the road speed limit type in this trip;

According to the total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip, the battery temperature rise gain value of this trip is determined.

In a possible implementation manner, the calculation formula of the total temperature rise gain value of the road type in this trip is:

Among them, K ₁ is the total temperature rise gain value of the road type in this trip; L is the total mileage of this trip; L _1i is the mileage corresponding to road type i in this trip; k _1i is the starting temperature of the battery The temperature rise gain value of road type i in this trip corresponding to the starting temperature of the environment; n is the number of road types in this trip;

The calculation formula of the total temperature rise gain value of the road speed limit type in this trip is:

Among them, K ₂ is the total temperature rise gain value of the road speed limit type in this trip; L _2j is the mileage corresponding to the road speed limit type j in this trip; k _2j is the corresponding starting temperature of the battery and the starting temperature of the environment The temperature rise gain value of road speed limit type j in this trip; m is the number of road speed limit types in this trip.

In a possible implementation manner, the battery temperature rise gain value of this trip is determined according to the total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip, including :

The total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip are summed to obtain the battery temperature rise gain value of this trip.

In a possible implementation manner, after determining the estimated value of the end-of-use temperature of the battery at the end of the current trip according to the battery temperature rise gain value, the initial battery temperature, and the initial ambient temperature of the current trip, the method further includes:

Obtain the actual value of the end-of-use temperature of the battery at the end of the trip;

If the absolute value of the difference between the estimated value of the end-of-use temperature of the battery at the end of the trip and the actual value of the end-of-use temperature of the battery at the end of the trip is greater than the preset difference, the Calculate the correction coefficient of the battery temperature rise gain value by using the actual value of the end temperature and the estimated value of the end temperature of the battery at the end of the trip;

According to the correction coefficient of the battery temperature rise gain value, the battery temperature rise gain value of the next trip is corrected, and the battery end-of-use temperature estimation at the end of the next trip is determined according to the corrected battery temperature rise gain value of the next trip. value.

In a possible implementation manner, the correction coefficient of the battery temperature rise gain value is calculated according to the actual value of the end-of-use temperature of the battery at the end of the trip and the estimated value of the end-of-use temperature of the battery at the end of the trip, including:

Divide the actual value of the end-of-use temperature of the battery at the end of the trip by the estimated value of the end-of-use temperature of the battery at the end of the trip to obtain the correction coefficient of the battery temperature rise gain value;

According to the correction coefficient of the battery temperature rise gain value, the battery temperature rise gain value of the next trip is corrected, including:

Multiply the correction coefficient of the battery temperature rise gain value by the battery temperature rise gain value of the next trip to obtain the corrected battery temperature rise gain value of the next trip.

In a possible implementation manner, the estimated value of the end-of-use temperature of the battery at the end of the current trip is determined according to the battery temperature rise gain value, the initial battery temperature, and the initial ambient temperature of the current trip, including:

According to T _g =(T _h -T _q )×K, the estimated value T _g of the end-of-use temperature of the battery at the end of this trip is obtained by calculation;

Among them, T _h is the starting temperature of the environment; T _q is the starting temperature of the battery; K is the battery temperature rise gain value for this trip.

In a second aspect, the present application provides an end-of-use temperature estimation device for a battery, including:

The first obtaining module is used to obtain the information of this itinerary;

The second obtaining module is used to obtain the starting temperature of the battery and the starting temperature of the environment for this trip;

The temperature rise gain value determination module is used to determine the battery temperature rise gain value of the current trip according to the current trip information, the starting temperature of the battery and the starting temperature of the environment;

The termination temperature estimation module is used to determine the estimated value of the termination temperature of the battery at the end of the trip according to the battery temperature rise gain value, the initial battery temperature and the initial ambient temperature of the trip.

In a possible implementation manner, the current trip information includes the total mileage of the trip, the mileage corresponding to each road type in this trip, and the mileage corresponding to each road speed limit type in this trip;

The temperature rise gain value determination module is specifically used for:

Determine the temperature rise gain value of each road type in this trip and the temperature rise gain value of each road speed limit type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment;

According to the total mileage of this trip, the mileage corresponding to each road type in this trip, and the temperature rise gain value of each road type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment, determine the The total temperature rise gain value of the road type;

According to the total mileage of this trip, the mileage corresponding to each road speed limit type in this trip, and the temperature rise gain value of each road speed limit type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment, determine The total temperature rise gain value of the road speed limit type in this trip;

According to the total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip, the battery temperature rise gain value of this trip is determined.

In a possible implementation manner, in the temperature rise gain value determination module, the calculation formula of the total temperature rise gain value of the road type in this trip is:

Among them, K ₁ is the total temperature rise gain value of the road type in this trip; L is the total mileage of this trip; L _1i is the mileage corresponding to road type i in this trip; k _1i is the starting temperature of the battery The temperature rise gain value of road type i in this trip corresponding to the starting temperature of the environment; n is the number of road types in this trip;

The calculation formula of the total temperature rise gain value of the road speed limit type in this trip is:

Among them, K ₂ is the total temperature rise gain value of the road speed limit type in this trip; L _2j is the mileage corresponding to the road speed limit type j in this trip; k _2j is the corresponding starting temperature of the battery and the starting temperature of the environment The temperature rise gain value of road speed limit type j in this trip; m is the number of road speed limit types in this trip.

In a possible implementation manner, the temperature rise gain value determination module is further used for:

The total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip are summed to obtain the battery temperature rise gain value of this trip.

In a possible implementation manner, the battery end-of-use temperature estimation device further includes a correction module;

Correction modules are used to:

Obtain the actual value of the end-of-use temperature of the battery at the end of the trip;

If the absolute value of the difference between the estimated value of the end-of-use temperature of the battery at the end of the trip and the actual value of the end-of-use temperature of the battery at the end of the trip is greater than the preset difference, the Calculate the correction coefficient of the battery temperature rise gain value by using the actual value of the end temperature and the estimated value of the end temperature of the battery at the end of the trip;

According to the correction coefficient of the battery temperature rise gain value, the battery temperature rise gain value of the next trip is corrected, and the battery end-of-use temperature estimation at the end of the next trip is determined according to the corrected battery temperature rise gain value of the next trip. value.

In one possible implementation, the correction module is also used to:

Divide the actual value of the end-of-use temperature of the battery at the end of the trip by the estimated value of the end-of-use temperature of the battery at the end of the trip to obtain the correction coefficient of the battery temperature rise gain value;

Multiply the correction coefficient of the battery temperature rise gain value by the battery temperature rise gain value of the next trip to obtain the corrected battery temperature rise gain value of the next trip.

In one possible implementation, the termination temperature estimation module is used specifically to:

According to T _g =(T _h -T _q )×K, the estimated value T _g of the end-of-use temperature of the battery at the end of this trip is obtained by calculation;

Among them, T _h is the starting temperature of the environment; T _q is the starting temperature of the battery; K is the battery temperature rise gain value for this trip.

In a third aspect, the present application provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the above-mentioned item when executing the computer program. In one aspect or any possible implementation manner of the first aspect, the steps of the battery end-of-use temperature estimation method.

In a fourth aspect, an embodiment of the present application provides a vehicle, including the terminal described in the third aspect.

In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, implements the first aspect or any of the first aspect above. A possible implementation means the steps of the battery end-of-use temperature estimation method.

The embodiments of the present application provide a method, device, vehicle, and storage medium for estimating the end-of-use temperature of a battery. The battery temperature rise of this trip is determined by the current trip information, the battery starting temperature of the current trip, and the environment starting temperature. Gain value; according to the battery temperature rise gain value of this trip, the battery starting temperature of this trip and the starting temperature of the environment to determine the estimated value of the end temperature of the battery at the end of this trip, which can be estimated based on the information of this trip , it can adapt to the working conditions of this trip, does not depend on special working conditions, and can improve the accuracy of estimating the end-of-use temperature of the battery.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present application. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the realization flow chart of the method for estimating the end-of-use temperature of the battery provided by the embodiment of the present application;

2 is a schematic structural diagram of a device for estimating the end-of-use temperature of a battery provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a terminal provided by an embodiment of the present application.

Detailed ways

In the following description, for the purpose of illustration rather than limitation, specific details such as a specific system structure and technology are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be practiced in other embodiments without 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.

In order to make the objectives, technical solutions and advantages of the present application clearer, the following descriptions will be given through specific embodiments in conjunction with the accompanying drawings.

Referring to FIG. 1 , it shows an implementation flow chart of the method for estimating the end-of-use temperature of a battery provided by an embodiment of the present application, where the end-of-use temperature is the average temperature of the battery when the vehicle ends; the execution subject of the method may be a terminal, which The terminal can be an in-vehicle terminal or an in-vehicle controller. The method is detailed as follows:

In S101, the current itinerary information is acquired.

In this embodiment, in order to estimate the end-of-use temperature of the battery at the end of the current trip, first obtain the current trip information, and then perform subsequent estimation based on the current trip information, so as to adapt to the operating conditions of the current trip and improve the current trip. The accuracy of the end-of-life temperature of the battery.

In a possible implementation manner, the current trip information can be obtained through a vehicle-mounted navigation system. The in-vehicle navigation system sends this trip information to the terminal. Exemplarily, before the trip starts, the user inputs the destination of the trip in the vehicle navigation system, and the vehicle navigation system automatically plans a route according to the starting point and the destination, and determines the current trip information according to the route.

This trip information is the information that affects the temperature rise level of the battery during the trip. The vehicle's speed, acceleration, deceleration and other vehicle driving conditions, the ambient temperature, and the power consumption of electrical devices such as air conditioners will all have an impact on the temperature rise of the battery. The driving habits of the driver and the road condition information in this trip will affect the driving state of the vehicle, which in turn affects the temperature rise of the battery.

In some embodiments, the current trip information includes the total mileage of the trip, the mileage corresponding to each road type in this trip, and the mileage corresponding to each road speed limit type in this trip.

The road type may be a highway, an urban road, or the like. The road speed limit type can be a speed limit of 50km/h, a speed limit of 100km/h, and the like. The road type and road speed limit type in this trip can be determined according to the driving route of this trip.

Exemplarily, the mileage corresponding to each road type in this trip may include the mileage traveled on expressways and the mileage traveled on urban roads in this trip, and the like. The mileage corresponding to each road speed limit type in this trip may include the mileage traveled on the section with a speed limit of 50km/h and the mileage traveled on the section with a speed limit of 100km/h, etc.

In S102, the starting temperature of the battery and the starting temperature of the environment for the current trip are obtained.

In this embodiment, a battery management system (Battery Management System, BMS) can collect the temperature of the battery and the ambient temperature where the battery is located in real time. At the beginning of this trip, the collected battery temperature is the starting temperature of the battery for this trip, and the collected ambient temperature of the battery is the starting ambient temperature of this trip. The battery management system sends the collected starting battery temperature and ambient starting temperature of this trip to the terminal. Wherein, the starting temperature of the battery is the average value of the temperatures of several positions of the battery at the beginning of this trip.

In a possible implementation manner, the starting temperature of the battery and the starting temperature of the environment for this trip may be collected by a temperature sensor.

In S103, the battery temperature rise gain value of the current trip is determined according to the current trip information, the battery initial temperature and the environment initial temperature.

While the vehicle is running, the temperature of the battery changes. In this embodiment, the battery temperature rise gain value can be used to characterize the change. The battery temperature rise gain value of this trip is related to the current trip information, the battery initial temperature, and the ambient initial temperature. Therefore, in this embodiment, the current trip information, the battery initial temperature, and the ambient initial temperature can be determined for this trip. The battery temperature rise gain value for the trip.

In some embodiments, the above S103 may include:

Determine the temperature rise gain value of each road type in this trip and the temperature rise gain value of each road speed limit type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment;

According to the total mileage of this trip, the mileage corresponding to each road type in this trip, and the temperature rise gain value of each road type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment, determine the The total temperature rise gain value of the road type;

According to the total mileage of this trip, the mileage corresponding to each road speed limit type in this trip, and the temperature rise gain value of each road speed limit type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment, determine The total temperature rise gain value of the road speed limit type in this trip;

According to the total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip, the battery temperature rise gain value of this trip is determined.

In this embodiment, each road type corresponds to a temperature rise gain value, and the temperature rise gain value is affected by the starting temperature of the battery and the starting temperature of the environment. Each road speed limit type corresponds to a temperature rise gain value, and the temperature rise gain value is affected by the starting temperature of the battery and the starting temperature of the environment.

Exemplarily, the first table may store the corresponding relationship between the starting temperature of the battery, the starting temperature of the environment, the road type and the temperature rise gain value. The temperature rise gain value of each road type in this trip can be obtained from the first table according to the battery starting temperature of this trip, the ambient starting temperature of this trip, and each road type included in this trip.

The second table may store the corresponding relationship between the starting temperature of the battery, the starting temperature of the environment, the type of road speed limit and the temperature rise gain value. According to the battery starting temperature of this trip, the ambient starting temperature of this trip, and each road speed limit type included in this trip, the temperature rise gain of each road speed limit type in this trip can be obtained from the second table. value.

The first table and the second table can be obtained according to pre-training. For example, based on the calculation formula of the estimated value of the end-of-use temperature of the battery, and according to the training sample set, the least squares method can be used to perform fitting training to obtain the first table and the second table. Wherein, the training sample set may include multiple training samples, and each training sample may include the starting temperature of the battery, the starting temperature of the environment, the actual value of the end temperature of the battery, the travel information of the current trip, and the like.

Based on the total mileage of this trip, the mileage corresponding to each road type in this trip, and the temperature rise gain value of each road type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment, the current trip can be calculated. The total temperature rise gain value of the road types in the trip; among them, the proportion of the mileage corresponding to each road type in this trip can be used as the weight coefficient of each road type, according to the weight coefficient of each road type and the mileage of each road type. The temperature rise gain value obtains the weighted temperature rise gain value of each road type, and then sums the weighted temperature rise gain value of each road type to obtain the total temperature rise gain value of the road type in this trip.

Based on the total mileage of this trip, the mileage corresponding to each road speed limit type in this trip, and the temperature rise gain values of each road speed limit type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment, we can Calculate the total temperature rise gain value of the road speed limit type in this trip; among them, the proportion of the mileage corresponding to each road speed limit type in this trip can be used as the weight coefficient of each road speed limit type, according to each road speed limit type. The weight coefficient of the speed limit type and the temperature rise gain value of each road speed limit type are obtained to obtain the weighted temperature rise gain value of each road speed limit type, and then the weighted temperature rise gain value of each road speed limit type is summed up to get the value of this trip. Total temperature gain value for road speed limit type.

It can be calculated using the following formula.

In some embodiments, the calculation formula of the total temperature rise gain value of the road type in this trip is:

Among them, K ₁ is the total temperature rise gain value of the road type in this trip; L is the total mileage of this trip; L _1i is the mileage corresponding to road type i in this trip; k _1i is the starting temperature of the battery The temperature rise gain value of road type i in this trip corresponding to the starting temperature of the environment; n is the number of road types in this trip;

The calculation formula of the total temperature rise gain value of the road speed limit type in this trip is:

Among them, K ₂ is the total temperature rise gain value of the road speed limit type in this trip; L _2j is the mileage corresponding to the road speed limit type j in this trip; k _2j is the corresponding starting temperature of the battery and the starting temperature of the environment The temperature rise gain value of road speed limit type j in this trip; m is the number of road speed limit types in this trip.

In this embodiment, the road types in this trip can be numbered from 1 to n, and each road type has a corresponding mileage and temperature rise gain value. The road speed limit types in this trip can be numbered from 1 to m, and each road speed limit type has a corresponding mileage and temperature rise gain value.

In some embodiments, the battery temperature rise gain value of the current trip is determined according to the total temperature rise gain value of the road type in the current trip and the total temperature rise gain value of the road speed limit type in the current trip, including:

The total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip are summed to obtain the battery temperature rise gain value of this trip.

In this embodiment, the total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip are added to obtain the battery temperature rise gain value K of this trip, that is K=K ₁ +K ₂ .

In a possible implementation manner, the battery temperature rise gain value of this trip is determined according to the total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip, include:

The total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip are weighted and summed to obtain the battery temperature rise gain value of this trip.

In this embodiment, the battery temperature rise gain value K=aK ₁ +bK ₂ for this trip, where a is the weight value of the total temperature rise gain value of the road type in this trip, and b is the road in this trip The weight value of the total temperature rise gain value of the speed limit type, a+b=1. The values of a and b can be set according to actual needs or obtained according to training, and there are no specific restrictions here.

In S104, the estimated value of the end-of-use temperature of the battery at the end of the current trip is determined according to the battery temperature rise gain value, the battery initial temperature, and the ambient initial temperature of the current trip.

The end-of-use temperature of the battery at the end of the current trip is related to the battery temperature rise gain value of the current trip, the battery starting temperature of the current trip, and the ambient starting temperature of the current trip. Therefore, this embodiment can be based on this trip. The battery temperature rise gain value of the trip, the initial battery temperature, and the initial ambient temperature determine the estimated value of the end-of-use temperature of the battery at the end of the trip.

In some embodiments, the above S104 may include:

According to T _g =(T _h -T _q )×K, the estimated value T _g of the end-of-use temperature of the battery at the end of this trip is obtained by calculation;

Among them, T _h is the starting temperature of the environment; T _q is the starting temperature of the battery; K is the battery temperature rise gain value for this trip.

In this embodiment of the present application, the battery temperature rise gain value of the current trip is determined according to the current trip information, the battery starting temperature of the current trip, and the ambient starting temperature; The starting temperature of the battery and the starting temperature of the environment determine the estimated value of the end temperature of the battery at the end of the trip, which can be estimated based on the information of the trip, and can be adapted to the working conditions of the trip without depending on the special working conditions. The accuracy of estimating the end-of-use temperature of the battery can be improved.

In some embodiments, after the above-mentioned S104, the above-mentioned method for estimating the end-of-use temperature of the battery may further include:

Obtain the actual value of the end-of-use temperature of the battery at the end of the trip;

If the absolute value of the difference between the estimated value of the end-of-use temperature of the battery at the end of the trip and the actual value of the end-of-use temperature of the battery at the end of the trip is greater than the preset difference, the Calculate the correction coefficient of the battery temperature rise gain value by using the actual value of the end temperature and the estimated value of the end temperature of the battery at the end of the trip;

According to the correction coefficient of the battery temperature rise gain value, the battery temperature rise gain value of the next trip is corrected, and the battery end-of-use temperature estimation at the end of the next trip is determined according to the corrected battery temperature rise gain value of the next trip. value.

In this embodiment, the actual value of the end-of-use temperature of the battery at the end of the current trip can be collected through a BMS or a temperature sensor.

Calculate the absolute value of the difference between the estimated value of the end-of-use temperature of the battery at the end of the trip and the actual value of the end-of-use temperature of the battery at the end of the trip. If the absolute value is not greater than the preset difference, it is considered that the current estimate is relatively accurate, and the same method can be used for the next estimate without correction.

If the absolute value is greater than the preset difference, it is considered that this estimation error is relatively large, and the battery can be calculated according to the actual value of the end-of-use temperature of the battery at the end of this trip and the estimated value of the end-of-use temperature of the battery at the end of this trip Correction factor for temperature rise gain value. When estimating the end-of-use temperature of the battery for the next trip, first obtain the information of the next trip, and obtain the starting temperature of the battery and the starting temperature of the environment for the next trip. The temperature and the starting temperature of the environment determine the battery temperature rise gain value of the next trip; then according to the correction coefficient of the battery temperature rise gain value, the battery temperature rise gain value of the next trip is corrected to obtain the corrected battery temperature rise value of the next trip. The temperature rise gain value; finally, the estimated value of the battery end-of-use temperature at the end of the next trip is determined according to the corrected battery temperature rise gain value of the next trip, the battery initial temperature of the next trip, and the ambient initial temperature.

The preset difference can be set according to actual needs. For example, it may be 2°C.

Among them, the reason for the existence of this estimation error is related to the first table and the second table obtained from the fitting training in the previous stage. During the fitting training in the early stage, there may be errors in the first table and the second table obtained by the fitting training due to insufficient training samples or other reasons, thus causing errors in this estimation. The error has nothing to do with the current trip information. Therefore, when correcting the battery temperature rise gain value for the next trip, it is not necessary to ensure that the next trip information is consistent with the current trip information.

In some embodiments, the above-mentioned calculation of the correction coefficient of the battery temperature rise gain value according to the actual value of the end-of-use temperature of the battery at the end of the current trip and the estimated value of the end-of-use temperature of the battery at the end of the current trip includes:

Divide the actual value of the end-of-use temperature of the battery at the end of the trip by the estimated value of the end-of-use temperature of the battery at the end of the trip to obtain the correction coefficient of the battery temperature rise gain value.

Correspondingly, according to the correction coefficient of the battery temperature rise gain value, the battery temperature rise gain value of the next trip is corrected, including:

Multiply the correction coefficient of the battery temperature rise gain value by the battery temperature rise gain value of the next trip to obtain the corrected battery temperature rise gain value of the next trip.

In this embodiment, the correction coefficient of the battery temperature rise gain value=the actual value of the end-of-use temperature of the battery at the end of the current trip/the estimated value of the end-of-use temperature of the battery at the end of the current trip. The corrected battery temperature rise gain value of the next trip = the correction coefficient of the battery temperature rise gain value * the battery temperature rise gain value of the next trip.

Among them, another method can also be used to calculate the corrected battery temperature rise gain value for the next trip. The details are as follows:

In a possible implementation manner, the above-mentioned correction factor for calculating the battery temperature rise gain value according to the actual value of the end-of-use temperature of the battery at the end of the current trip and the estimated value of the end-of-use temperature of the battery at the end of the current trip includes:

Calculate the absolute value of the difference between the estimated value of the end-of-use temperature of the battery at the end of the trip and the actual value of the end-of-use temperature of the battery at the end of the trip, and divide the absolute value by the temperature of the battery at the end of the trip. Using the termination temperature estimate, obtain a correction factor for the battery temperature rise gain value.

Correspondingly, according to the correction coefficient of the battery temperature rise gain value, the battery temperature rise gain value of the next trip is corrected, including:

If the estimated value of the battery's end-of-use temperature at the end of this trip is greater than the actual value of the battery's end-of-use temperature at the end of this trip, the corrected battery temperature rise gain value of the next trip = the battery temperature rise of the next trip Gain value*(1-correction coefficient of battery temperature rise gain value);

If the estimated value of the end-of-use temperature of the battery at the end of the current trip is smaller than the actual value of the end-of-use temperature of the battery at the end of the current trip, the corrected battery temperature rise gain value of the next trip = the battery temperature rise of the next trip Gain value*(1+correction coefficient of battery temperature rise gain value).

In this embodiment, the battery temperature rise gain value of the next trip can be corrected according to the correction coefficient of the battery temperature rise gain value, so as to further improve the accuracy of the estimated value of the end-of-use temperature of the battery.

The accuracy of the battery end-of-use temperature estimation depends on factors such as current, battery starting temperature, ambient temperature, and the mileage of the current trip. Among them, the mileage of this trip is an important factor in the estimation of the end-of-use temperature of the battery, which can realize the adaptive estimation of the temperature.

This embodiment can perform online estimation of temperature changes under different driving conditions on any planned driving route, thereby realizing the estimation of the end-of-use temperature of the battery under driving conditions of different roads and traffic environments, which is beneficial to other control strategies based on Use the termination temperature for policy development.

It should be understood that the size of the sequence numbers of the steps in the above embodiments does not mean the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The following are apparatus embodiments of the present application. For details that are not described in detail, reference may be made to the above-mentioned corresponding method embodiments.

FIG. 2 shows a schematic structural diagram of the device for estimating the end-of-use temperature of the battery provided by the embodiment of the present application. For the convenience of description, only the part related to the embodiment of the present application is shown, and the details are as follows:

As shown in FIG. 2 , the battery end-of-use temperature estimation device 30 includes: a first acquisition module 31 , a second acquisition module 32 , a temperature rise gain value determination module 33 and a use-end temperature estimation module 34 .

The first obtaining module 31 is used to obtain the current itinerary information;

The second obtaining module 32 is used to obtain the starting temperature of the battery and the starting temperature of the environment for this trip;

The temperature rise gain value determination module 33 is configured to determine the battery temperature rise gain value of the current trip according to the current trip information, the battery initial temperature and the ambient initial temperature;

The end temperature estimation module 34 is used to determine the estimated value of the end temperature of the battery at the end of the current trip according to the battery temperature rise gain value, the initial battery temperature and the initial ambient temperature of the current trip.

In the embodiment of the present application, the temperature rise gain value determination module is used to determine the battery temperature rise gain value of the current trip according to the current trip information, the battery initial temperature of the current trip, and the ambient initial temperature; the same as the use of the termination temperature estimation module, according to The battery temperature rise gain value of this trip, the battery starting temperature and ambient starting temperature of this trip determine the estimated value of the battery's end-of-use temperature at the end of this trip, which can be estimated based on the trip information, and can be adaptive The working conditions of this trip do not depend on special working conditions, which can improve the accuracy of estimating the end-of-use temperature of the battery.

In a possible implementation manner, the current trip information includes the total mileage of the trip, the mileage corresponding to each road type in this trip, and the mileage corresponding to each road speed limit type in this trip;

The temperature rise gain value determination module 33 is specifically used for:

Determine the temperature rise gain value of each road type in this trip and the temperature rise gain value of each road speed limit type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment;

According to the total mileage of this trip, the mileage corresponding to each road type in this trip, and the temperature rise gain value of each road type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment, determine the The total temperature rise gain value of the road type;

According to the total mileage of this trip, the mileage corresponding to each road speed limit type in this trip, and the temperature rise gain value of each road speed limit type in this trip corresponding to the starting temperature of the battery and the starting temperature of the environment, determine The total temperature rise gain value of the road speed limit type in this trip;

According to the total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip, the battery temperature rise gain value of this trip is determined.

In a possible implementation manner, in the temperature rise gain value determination module 33, the calculation formula of the total temperature rise gain value of the road type in this trip is:

Among them, K ₁ is the total temperature rise gain value of the road type in this trip; L is the total mileage of this trip; L _1i is the mileage corresponding to road type i in this trip; k _1i is the starting temperature of the battery The temperature rise gain value of road type i in this trip corresponding to the starting temperature of the environment; n is the number of road types in this trip;

The calculation formula of the total temperature rise gain value of the road speed limit type in this trip is:

Among them, K ₂ is the total temperature rise gain value of the road speed limit type in this trip; L _2j is the mileage corresponding to the road speed limit type j in this trip; k _2j is the corresponding starting temperature of the battery and the starting temperature of the environment The temperature rise gain value of road speed limit type j in this trip; m is the number of road speed limit types in this trip.

In a possible implementation manner, the temperature rise gain value determination module 33 may also be used to:

The total temperature rise gain value of the road type in this trip and the total temperature rise gain value of the road speed limit type in this trip are summed to obtain the battery temperature rise gain value of this trip.

In a possible implementation manner, the battery end-of-use temperature estimation device 30 may further include: a correction module.

Correction modules can be used to:

Obtain the actual value of the end-of-use temperature of the battery at the end of the trip;

If the absolute value of the difference between the estimated value of the end-of-use temperature of the battery at the end of the trip and the actual value of the end-of-use temperature of the battery at the end of the trip is greater than the preset difference, the Calculate the correction coefficient of the battery temperature rise gain value by using the actual value of the end temperature and the estimated value of the end temperature of the battery at the end of the trip;

According to the correction coefficient of the battery temperature rise gain value, the battery temperature rise gain value of the next trip is corrected, and the battery end-of-use temperature estimation at the end of the next trip is determined according to the corrected battery temperature rise gain value of the next trip. value.

In one possible implementation, the correction module can also be used to:

Divide the actual value of the end-of-use temperature of the battery at the end of the trip by the estimated value of the end-of-use temperature of the battery at the end of the trip to obtain the correction coefficient of the battery temperature rise gain value;

Multiply the correction coefficient of the battery temperature rise gain value by the battery temperature rise gain value of the next trip to obtain the corrected battery temperature rise gain value of the next trip.

In a possible implementation, using the termination temperature estimation module 34 is specifically used to:

According to T _g =(T _h -T _q )×K, the estimated value T _g of the end-of-use temperature of the battery at the end of this trip is obtained by calculation;

Among them, T _h is the starting temperature of the environment; T _q is the starting temperature of the battery; K is the battery temperature rise gain value for this trip.

The embodiments of the present application also provide a computer program product, which has program code, and when the program code runs in a corresponding processor, controller, computing device, or terminal, executes any one of the above-mentioned embodiments of the battery end-of-use temperature estimation method The steps in, for example, S101 to S104 shown in FIG. 1 . It should be understood by those skilled in the art that the methods and associated devices provided in the embodiments of the present application may be implemented in various forms of hardware, software, firmware, special-purpose processors, or combinations thereof. Special purpose processors may include application specific integrated circuits (ASICs), reduced instruction set computers (RISCs), and/or field programmable gate arrays (FPGAs). The proposed method and apparatus are preferably implemented as a combination of hardware and software. The software is preferably installed on the program storage device as an application. It is typically a machine based on a computer platform with hardware such as one or more central processing units (CPUs), random access memory (RAM) and one or more input/output (I/O) interfaces. An operating system is also typically installed on the computer platform. The various processes and functions described herein may be part of an application program, or a portion thereof may be performed by an operating system.

FIG. 3 is a schematic diagram of a terminal provided by an embodiment of the present application. As shown in FIG. 3 , the terminal 4 of this embodiment includes: a processor 40 , a memory 41 , and a computer program 42 stored in the memory 41 and executable on the processor 40 . When the processor 40 executes the computer program 42 , the steps in the above embodiments of the method for estimating the end-of-use temperature of each battery are implemented, for example, S101 to S104 shown in FIG. 1 . Alternatively, when the processor 40 executes the computer program 42, the functions of the modules/units in each of the foregoing apparatus embodiments, such as the functions of the modules/units 31 to 34 shown in FIG. 2, are implemented.

Exemplarily, the computer program 42 may be divided into one or more modules/units, and the one or more modules/units are stored in the memory 41 and executed by the processor 40 to complete the / Implement the solutions provided in this application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program 42 in the terminal 4 . For example, the computer program 42 may be divided into modules/units 31 to 34 shown in FIG. 2 .

The terminal 4 may be a computing device such as an in-vehicle terminal or an in-vehicle controller. The terminal 4 may include, but is not limited to, a processor 40 and a memory 41 . Those skilled in the art can understand that FIG. 3 is only an example of the terminal 4, and does not constitute a limitation on the terminal 4. It may include more or less components than the one shown in the figure, or combine some components, or different components, such as The terminal may also include input and output devices, network access devices, buses, and the like.

The so-called processor 40 may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 41 may be an internal storage unit of the terminal 4 , such as a hard disk or a memory of the terminal 4 . The memory 41 may also be an external storage device of the terminal 4, such as a plug-in hard disk equipped on the terminal 4, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, Flash card (Flash Card) and so on. Further, the memory 41 may also include both an internal storage unit of the terminal 4 and an external storage device. The memory 41 is used to store the computer program and other programs and data required by the terminal. The memory 41 can also be used to temporarily store data that has been output or will be output.

Corresponding to the above-mentioned terminal 4 , an embodiment of the present application further provides a vehicle, including the above-mentioned terminal 4 .

Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. Module completion, that is, dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit, and the above-mentioned integrated units may adopt hardware. It can also be realized in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present application. For the specific working processes of the units and modules in the above-mentioned system, reference may be made to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the foregoing embodiments, the description of each embodiment has its own emphasis. For parts that are not described or described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

In the embodiments provided in this application, it should be understood that the disclosed apparatus/terminal and method may be implemented in other manners. For example, the device/terminal embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or Components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated modules/units, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the present application can implement all or part of the processes in the methods of the above embodiments, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer When the program is executed by the processor, the steps of the above embodiments of the method for estimating the end-of-use temperature of each battery can be implemented. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form, and the like. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, removable hard disk, magnetic disk, optical disk, computer memory, Read-Only Memory (ROM) , Random Access Memory (Random Access Memory, RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable media may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer-readable media Excluded are electrical carrier signals and telecommunication signals.

Furthermore, the embodiments shown in the drawings of the present application or the features of the various embodiments mentioned in the present specification are not necessarily to be understood as separate embodiments from each other. Rather, each feature described in one of the examples of one embodiment can be combined with one or more other desirable features from other embodiments, resulting in other embodiments not described in words or with reference to the accompanying drawings.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the above-mentioned embodiments, those of ordinary skill in the art should understand that: it can still be used for the above-mentioned implementations. The technical solutions described in the examples are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the application, and should be included in the within the scope of protection of this application.

Claims (10)

1. A battery end-of-use temperature estimation method, comprising:

obtaining the current journey information;

acquiring the battery initial temperature and the environment initial temperature of the current journey;

determining a battery temperature rise gain value of the current trip according to the current trip information, the battery initial temperature and the environment initial temperature;

and determining the estimated value of the use termination temperature of the battery at the end of the current stroke according to the battery temperature rise gain value of the current stroke, the battery starting temperature and the environment starting temperature.

2. The method for estimating the use termination temperature of the battery according to claim 1, wherein the current trip information includes a total traveled mileage of the current trip, a traveled mileage corresponding to each road type of the current trip, and a traveled mileage corresponding to each road speed limit type of the current trip;

determining a battery temperature rise gain value of the current trip according to the current trip information, the battery starting temperature and the environment starting temperature, comprising:

determining temperature rise gain values of each road type in the current journey and each road speed limit type in the current journey, which correspond to the battery starting temperature and the environment starting temperature;

determining a total temperature rise gain value of the road type in the current journey according to the total driving mileage of the current journey, the driving mileage corresponding to each road type in the current journey, and the temperature rise gain value of each road type in the current journey corresponding to the battery starting temperature and the environment starting temperature;

determining a total temperature rise gain value of the road speed limit type in the current journey according to the total travel mileage of the current journey, the travel mileage corresponding to each road speed limit type in the current journey and the temperature rise gain value of each road speed limit type in the current journey corresponding to the battery initial temperature and the environment initial temperature;

and determining the battery temperature rise gain value of the current journey according to the total temperature rise gain value of the road type in the current journey and the total temperature rise gain value of the road speed limit type in the current journey.

3. The battery use termination temperature estimation method according to claim 2, wherein the calculation formula of the total temperature rise gain value of the road type in the current trip is:

wherein, K ₁ The total temperature rise gain value of the road type in the current journey is obtained; l is the total driving mileage of the journey; l is _1i The driving mileage corresponding to the road type i in the current journey is obtained; k is a radical of _1i The temperature rise gain value of the road type i in the current journey corresponding to the battery initial temperature and the environment initial temperature is obtained; n is the number of road types in the current journey;

the calculation formula of the total temperature rise gain value of the road speed limit type in the current journey is as follows:

wherein, K ₂ The total temperature rise gain value of the road speed limit type in the current journey is obtained; l is _2j The driving mileage corresponding to the road speed limit type j in the current journey; k is a radical of _2j The temperature rise gain value of the road speed limit type j in the current journey corresponding to the battery starting temperature and the environment starting temperature; and m is the number of the road speed limit types in the current journey.

4. The method for estimating the use termination temperature of the battery according to claim 2, wherein the determining the battery temperature rise gain value for the current trip according to the total temperature rise gain value for the road type in the current trip and the total temperature rise gain value for the speed limit type for the road in the current trip comprises:

and summing the total temperature rise gain value of the road type in the current journey and the total temperature rise gain value of the road speed-limiting type in the current journey to obtain the battery temperature rise gain value of the current journey.

5. The method for estimating usage termination temperature of a battery according to claim 1, further comprising, after determining the estimated usage termination temperature of the battery at the end of the current trip based on the gain value of the battery temperature rise of the current trip, the battery start temperature, and the environment start temperature:

acquiring an actual value of the use termination temperature of the battery at the end of the current stroke;

if the absolute value of the difference value between the estimated use termination temperature value of the battery at the end of the current stroke and the actual use termination temperature value of the battery at the end of the current stroke is greater than the preset difference value, calculating a correction coefficient of a battery temperature rise gain value according to the actual use termination temperature value of the battery at the end of the current stroke and the estimated use termination temperature value of the battery at the end of the current stroke;

and correcting the battery temperature rise gain value of the next stroke according to the correction coefficient of the battery temperature rise gain value, and determining the estimated use termination temperature value of the battery at the end of the next stroke according to the corrected battery temperature rise gain value of the next stroke.

6. The method for estimating the use end temperature of the battery according to claim 5, wherein the calculating the correction coefficient of the battery temperature rise gain value based on the actual value of the use end temperature of the battery at the end of the present trip and the estimated value of the use end temperature of the battery at the end of the present trip includes:

dividing the actual value of the use ending temperature of the battery at the end of the current stroke by the estimated value of the use ending temperature of the battery at the end of the current stroke to obtain a correction coefficient of a battery temperature rise gain value;

according to the correction coefficient of the battery temperature rise gain value, correcting the battery temperature rise gain value of the next stroke, comprising the following steps of:

and multiplying the correction coefficient of the battery temperature rise gain value by the battery temperature rise gain value of the next stroke to obtain the corrected battery temperature rise gain value of the next stroke.

7. The method for estimating the use termination temperature of a battery according to any one of claims 1 to 6, wherein the determining the estimated use termination temperature of the battery at the end of the current trip based on the battery temperature rise gain value of the current trip, the battery start temperature, and the environment start temperature includes:

according to T _g ＝(T _h -T _q ) xK, calculating to obtain the estimated value T of the use termination temperature of the battery at the end of the current journey _g ；

Wherein, T _h Is the ambient starting temperature; t is _q Is the cell starting temperature; and K is the battery temperature rise gain value of the current stroke.

8. An end-of-use temperature estimation device for a battery, comprising:

the first acquisition module is used for acquiring the travel information;

the second acquisition module is used for acquiring the battery initial temperature and the environment initial temperature of the current journey;

the temperature rise gain value determining module is used for determining a battery temperature rise gain value of the current stroke according to the current stroke information, the battery initial temperature and the environment initial temperature;

and the use termination temperature estimation module is used for determining the use termination temperature estimation value of the battery at the end of the current stroke according to the battery temperature rise gain value of the current stroke, the battery starting temperature and the environment starting temperature.

9. A vehicle, characterized in that the vehicle comprises a terminal; the terminal comprises a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method for estimating the use termination temperature of a battery according to any of the above claims 1 to 7 when executing the computer program.

10. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the steps of the end-of-use temperature estimation method of a battery according to any one of claims 1 to 7 above.

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