CN117301954A

CN117301954A - Battery charge state adjusting method and device, electronic equipment and storage medium

Info

Publication number: CN117301954A
Application number: CN202311257316.4A
Authority: CN
Inventors: 唐如意; 梁源; 黄大飞; 刘小飞; 陈轶; 周正伟
Original assignee: Chongqing Seres New Energy Automobile Design Institute Co Ltd
Current assignee: Chongqing Seres New Energy Automobile Design Institute Co Ltd
Priority date: 2023-09-26
Filing date: 2023-09-26
Publication date: 2023-12-29

Abstract

The application relates to the technical field of automobile control, and provides a method and a device for adjusting a battery charge state, electronic equipment and a storage medium. The method comprises the following steps: if the running times of the vehicle are detected to be updated, determining the lowest temperature of the battery cell of the vehicle when the vehicle runs at the time; determining a temperature set of the lowest temperature of the battery cell of the current running of the vehicle, wherein elements in the set are the lowest temperature of the battery cell corresponding to each running in preset running times, and the preset running times are adjacent running times; under the condition that element corresponding element values in the temperature set are detected, determining a target SOC offset according to the temperature set and a corresponding relation between a preset battery core temperature and a battery state of charge SOC offset, wherein the SOC offset is larger than zero when the battery core temperature is lower than the preset temperature value; and adjusting the initial SOC value according to the target SOC offset to obtain a target SOC value. According to the embodiment of the application, the dynamic performance of the vehicle at low temperature can be improved.

Description

Battery charge state adjusting method and device, electronic equipment and storage medium

Technical Field

The present disclosure relates to the field of automobile control technologies, and in particular, to a method and an apparatus for adjusting a battery state of charge, an electronic device, and a storage medium.

Background

Nowadays, the requirements of people on new energy automobiles are increasing, and the performance requirements on all aspects of the new energy automobiles are also increasing. The power battery is quite important for new energy automobiles, but in some special situations, such as high temperature, low temperature and low electric quantity, especially in low temperature, the power battery capacity is greatly reduced, so that the endurance capacity, the power performance and the like of the whole automobile are affected.

In the related art, for the electric power balance, the power generation control Of the range extender is mainly performed by corresponding to the target State Of Charge (SOC) in the vehicle mode, and different vehicle modes correspond to different target SOCs, for example, the pure electric preference Of partial vehicle type is used, so as to maintain the State Of Charge in a lower section, but the State Of Charge may not meet the dynamic performance Of the vehicle and the higher performance experience Of the whole vehicle at low temperature.

As can be seen, the related art has a problem that the dynamic property of the automobile is poor in a low-temperature environment.

Disclosure of Invention

In view of this, the embodiments of the present application provide a method, an apparatus, an electronic device, and a storage medium for adjusting a state of charge of a battery, so as to solve the problem in the prior art that the dynamic performance of an automobile is poor in a low-temperature environment.

In a first aspect of an embodiment of the present application, a method for adjusting a state of charge of a battery is provided, including:

under the condition that the running times of the vehicle are detected to be updated, determining the lowest temperature of the battery cell of the vehicle when the vehicle runs for the time;

determining a temperature set of the lowest temperature of the battery cell of the vehicle when the vehicle runs at the time, wherein elements in the temperature set are the lowest temperature of the battery cell corresponding to each running in preset running times, and the preset running times are adjacent running times;

under the condition that element corresponding element values in the temperature set are detected, determining a target SOC offset according to the temperature set and a corresponding relation between a preset battery core temperature and a battery state of charge SOC offset, wherein the SOC offset is larger than zero when the battery core temperature is lower than a preset temperature value;

and adjusting the initial SOC value according to the target SOC offset to obtain a target SOC value.

In a second aspect of the embodiments of the present application, there is provided a device for adjusting a state of charge of a battery, including:

the first determining module is used for determining the lowest temperature of the battery cell of the vehicle when the vehicle runs for the time under the condition that the running times of the vehicle are detected to be updated;

The second determining module is used for determining a temperature set of the lowest temperature of the battery cell of the vehicle when the vehicle runs at the time, wherein elements in the temperature set are the lowest temperature of the battery cell corresponding to each running in preset running times, and the preset running times are adjacent running times;

a third determining module, configured to determine a target SOC offset according to the temperature set and a correspondence between a preset battery core temperature and a battery state of charge SOC offset when an element corresponding to an element value in the temperature set is detected, where the SOC offset is greater than zero when the battery core temperature is lower than a preset temperature value;

and the adjusting module is used for adjusting the initial SOC value according to the target SOC offset to obtain a target SOC value.

In a third aspect of the embodiments of the present application, there is provided an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the above method when executing the computer program.

In a fourth aspect of the embodiments of the present application, there is provided a readable storage medium storing a computer program which, when executed by a processor, implements the steps of the above method.

Compared with the prior art, the embodiment of the application has the beneficial effects that:

in the embodiment, under the condition that the running times of the vehicle are detected to be updated, determining the lowest temperature of the battery cell of the vehicle when the vehicle runs at the time; determining a temperature set of the lowest temperature of the battery cell of the vehicle when the vehicle runs at the time, wherein elements in the temperature set are the lowest temperature of the battery cell corresponding to each running in preset running times, and the preset running times are adjacent running times; under the condition that element corresponding element values in the temperature set are detected, determining a target SOC offset through a corresponding relation between a preset battery core temperature and the SOC offset, wherein the SOC offset is larger than zero when the battery core temperature is lower than the preset temperature value, and adjusting the initial SOC value according to the target SOC offset to obtain the target SOC value. Because the SOC offset is larger than zero when the temperature of the battery cell is lower than the preset temperature value, namely the determined target SOC offset is larger than zero in the low-temperature environment, the initial SOC value is adjusted according to the target SOC offset, and the obtained target SOC value is larger than the initial SOC value, the aim that the target SOC value is improved by a certain value compared with the initial SOC in the low-temperature driving environment is achieved, the power performance and the electric quantity retention capacity of the extended-range electric automobile at low temperature are improved, and the problem that the power performance of the automobile at low temperature is poor is solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flow chart of a method for adjusting a battery state of charge according to an embodiment of the present disclosure;

fig. 2 is a flow chart of another method for adjusting a state of charge of a battery according to an embodiment of the present disclosure;

fig. 3 is a flowchart of another method for adjusting a battery state of charge according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a device for adjusting a battery state of charge according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more.

Furthermore, it should 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 … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

A method and apparatus for adjusting a state of charge of a battery according to embodiments of the present application will be described in detail with reference to the accompanying drawings.

Fig. 1 is a flow chart of a method for adjusting a battery state of charge according to an embodiment of the present application. A method of adjusting the state of charge of a battery of fig. 1 may be performed by a processor or a server. As shown in fig. 1, the method includes:

step 101, in the case that the running frequency of the vehicle is detected to be updated, determining the lowest temperature of the battery cell of the vehicle when the vehicle runs for the time.

Specifically, if it is detected that the number of traveling times of the vehicle is updated, the battery management system (Battery Management System, BMS) may be awakened, the battery cell temperature of the battery is detected by the BMS, the BMS sends the detected battery cell temperature to the extended-range vehicle controller (Vehicle Control Unit, VCU) through the controller area network (Controller Area Network, CAN), and the VCU receives the battery cell temperature.

It should be noted that, when the vehicle is running at the present time, the number of times of running of the vehicle is updated due to a running process, that is, the present running process, and the running process refers to a process from ignition to flameout of the vehicle; the lowest temperature of the battery cell when traveling at a time means the lowest temperature of the battery cell detected during the traveling at the time. For example, as one example, assuming that the battery cell temperature of the vehicle is 10 degrees when the next travel starts, the battery cell temperature is 12 degrees after traveling for 10 minutes, and the battery cell temperature continues to increase before flameout, the battery cell minimum temperature at the time of the next travel is 10 degrees. In general, since the temperature of the battery cell increases with the running of the vehicle, the lowest temperature of the battery cell during one running is the temperature at which the vehicle starts to run.

Step 102, determining a temperature set of the lowest temperature of the battery cell of the vehicle when the vehicle runs at the time, wherein elements in the temperature set are the lowest temperature of the battery cell corresponding to each running in preset running times.

Wherein each running corresponding to the preset running times is adjacent running.

Specifically, the element in the temperature set is the lowest temperature of the battery cell corresponding to the preset running times. For example, assuming that the preset number of times of travel is 5 times, then the element in the temperature set is the lowest temperature of the battery cell corresponding to 5 times of travel, and assuming that the number of times of travel corresponding to the time of travel is 4, then it may be determined that the temperature set to which the lowest temperature of the battery cell at the time of travel belongs is the set to which the lowest temperatures of the battery cells at the times of travel of 1, 2, and 3 are located; for another example, assuming that the current number of travel is 8, since each travel corresponding to the preset number of travel is adjacent travel, that is, the number of travel times 1 to 5 belongs to one set, and the number of travel times 6 to 10 belongs to one set, it can be determined that the temperature set to which the lowest temperature of the battery cell at the time of travel belongs is the set to which the lowest temperatures of the battery cells of the number of travel times 6 and 7 belong.

By determining the temperature set of the lowest temperature of the battery cell of the vehicle when the vehicle runs at the next time, the lowest temperature of the battery cell is segmented, and the SOC offset value is conveniently determined according to the temperature set.

Step 103, under the condition that element corresponding element values in the temperature set are detected, determining a target SOC offset according to the temperature set and a corresponding relation between a preset battery core temperature and a battery state of charge SOC offset, wherein the SOC offset is larger than zero when the battery core temperature is lower than the preset temperature value.

Specifically, the correspondence between the battery cell temperature and the battery state of charge SOC offset may be preset by the controller. Specifically, the calibration matching can be performed by referring to the sizes of different battery packs of different vehicle types, and the corresponding relation between the temperature of the battery cell and the offset of the state of charge is established. As an example, taking an initial SOC threshold value of 20% for the power battery, obtaining a cell temperature of 0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃ or 50 ℃ from the operation data, and a SOC offset value of 0 for the battery; when the temperature of the battery core is minus 10 ℃, the SOC offset value of the battery is 10%; when the temperature of the battery core is minus 20 ℃, the SOC offset value of the battery is 20%, when the temperature of the battery core is minus 30 ℃, the SOC offset value of the battery is 30%, namely, the battery is obtained according to expert experience and multiple operation data, when the temperature of the battery core is higher than 0 ℃, the SOC offset value of the battery is 0, when the temperature of the battery core is lower than 0 ℃, the SOC offset value of the battery is higher than 0, and the specific corresponding relation can be shown in the table 1:

TABLE 1

X	-30	-20	-10	0	10	20	30	40	50
										Y	30	20	10	0	0	0	0	0	0

Where X represents the telecommunications temperature and Y represents the SOC offset.

In this step, if it is detected that the element values in one temperature set are full, the target offset may be determined according to a preset correspondence, so as to implement adjustment of the current SOC value.

And step 104, adjusting the initial SOC value according to the target SOC offset to obtain a target SOC value.

Specifically, the initial SOC value may be calibrated and matched according to different battery pack sizes of different vehicle models, for example, the initial SOC value may be 20%.

The target SOC is used for controlling intervention time of the range extender, the range extender is controlled by the VCU to start when the current SOC is lower than a certain value of the target SOC, and the range extender is controlled by the VCU to stop when the current SOC is lower than the certain value of the target SOC.

The target SOC value may be a sum of the target SOC offset and the initial SOC value, or may be a sum of a certain ratio of the initial SOC value and the target SOC offset.

According to the target SOC offset, the initial SOC value is adjusted to obtain the target SOC value, and because the target SOC offset is larger than zero in a low-temperature environment, namely when the temperature of the battery core is lower than a preset temperature value, after the initial SOC value is adjusted through the target SOC offset, the intervention working time of the range extender is brought in advance, so that the range extender is started in advance, after the range extender enters a working mode of the range extender, the range extender can drive a vehicle to normally run and can charge a power battery at the same time, the SOC of the power battery is kept near the target SOC value, the state of charge of the vehicle when the vehicle just enters the working mode of the range extender is not too low, and the power performance of the vehicle at low temperature is improved.

According to the technical scheme provided by the application, under the condition that the running times of the vehicle are detected to be updated, determining the lowest temperature of the battery cell of the vehicle when the vehicle runs for the time; determining a temperature set of the lowest temperature of the battery cell of the vehicle when the vehicle runs at the time, wherein elements in the temperature set are the lowest temperature of the battery cell corresponding to each running in preset running times; under the condition that element corresponding element values in the temperature set are detected, determining a target SOC offset through a corresponding relation between a preset battery core temperature and a battery state of charge SOC offset, wherein the SOC offset is larger than zero when the battery core temperature is lower than the preset temperature value, and adjusting an initial SOC value according to the target SOC offset to obtain the target SOC value. Because the target SOC offset is larger than zero, the initial SOC value is adjusted according to the target SOC offset, and the obtained target SOC value is larger than the initial SOC value, so that the state of charge of the vehicle when the vehicle just enters a range extender working mode is ensured to be kept near the target SOC value in a low-temperature driving environment, and the target SOC value is improved by a certain value compared with the initial SOC, so that the power performance and the electric quantity retention capacity of the range extender electric vehicle at low temperature are improved, the performance requirement of the whole vehicle can be met, the driving experience of a user is better, and the problem that the power performance of the vehicle at low temperature is poor is solved.

In some embodiments, detecting a vehicle travel time update includes:

detecting whether the difference between the current time and the recording time of the running times before updating is larger than the preset time or not under the condition that the high-voltage state flag bit of the vehicle is detected to indicate the high voltage on the vehicle;

acquiring the current running speed of the vehicle when the current running speed is greater than the preset time;

and when the current running speed is greater than the preset running speed, determining the current running of the vehicle as effective running, and updating the running times.

Specifically, since the situation that the vehicle runs for many times on the same day exists, the lowest temperature of the battery core recorded in the current running of the vehicle can be influenced by the waste heat generated by the heating of the battery core when the vehicle runs for several times on the same day, and the lowest temperature of the battery core corresponding to the current running of the vehicle recorded on the same day is unreasonable, in order to avoid the influence of the waste heat brought by the battery core of the previous running of the vehicle on the same day, whether the difference value between the current time and the recording time of the running times before updating is larger than the preset time can be detected under the condition that the high-voltage state flag bit of the vehicle is detected to indicate the high voltage on the vehicle. The preset time may be 24 hours, 36 hours, or the like, and is not particularly limited herein.

The preset running speed is used to indicate the running state of the vehicle, and may be, for example, 3 km/hr, 4 km/hr, etc., and is not particularly limited herein. When the difference between the current time and the recorded time of the running times before updating is larger than the preset time and the current running speed is larger than the preset running speed, the current running can be used as effective running, and the running times are added with 1 to obtain the current running times.

As an example, assuming that the preset time is 24 hours and the preset travel speed is 3 km/h, referring to fig. 2, detecting the update of the number of times the vehicle travels includes the steps of:

and judging whether the vehicle is at high pressure or not by detecting the high-pressure state flag bit through a Vehicle Control Unit (VCU).

If the high voltage on the vehicle is determined, numthasw= NumToBsw, numToBsw is a historical running time value stored in the bottom layer of the VCU, numthasw is a historical running time value stored in the application layer of the VCU, and the numthasw value is assigned to numthasw, so that the consistency of the running times of the target vehicle stored in the application layer and the bottom layer of the VCU is ensured.

Then, it is judged whether the time of the current running and the time of the last running update are longer than 24 hours.

If the current running speed is greater than 24 hours, judging whether the current running speed is greater than 3 kilometers per hour (3 kph).

If it is greater than 3 km/h, tempnum=numfoasw+1, and TempNum is the current number of runs.

In addition, numtobsw=tempnum is set, and the current running times are stored in the VCU application layer, so that the consistency of the running times of the vehicle in the VCU application layer and the VCU bottom layer is ensured.

Through the high pressure on the vehicle, when the current time and the current running speed meet certain conditions, the running times are updated, the influence of the residual temperature of the power battery on the temperature of the battery when the current time and the last running times are updated are avoided, in addition, the problem that the judgment of the temperature of the battery is influenced by the starting or low-speed running of the vehicle is avoided, the lowest temperature of the recorded battery is more reasonable, and the accuracy of the target SOC offset determined according to the lowest temperature of the recorded battery is improved.

In some embodiments, determining the temperature set to which the lowest temperature of the battery cell when traveling at a time belongs comprises:

under the condition that the remainder of the ratio of the updated current running times to the preset running times is 1, determining the current running times as the initial times of the preset running times;

under the condition that the remainder of the ratio of the updated current running times to the preset running times is 0, determining the current running times as the ending times of the preset running times;

Determining the lowest temperature of the battery cell corresponding to the starting times and the ending times and the lowest temperature of the battery cell corresponding to the running times between the starting times and the ending times, wherein the lowest temperature of the battery cell and the lowest temperature of the battery cell belong to the same temperature set.

Specifically, as an example, assuming that the preset number of traveling times is 5, referring to fig. 3, a process of determining a temperature set to which the lowest temperature of the battery cell at the time of traveling belongs is as follows:

detecting that the current running times are updated, namely that the current running times are 1 added to the historical running times, and the remainder of the ratio of the current running times to 5 is 1, and determining the lowest temperature of the battery cell corresponding to the current running times as a first element value of a newly-built temperature set; for example, as one example, when the running times are 1, 6 and 11, and the ratio remainder of the running times to 5 is 1, the running times are 1, 6 and 11 are the first element values in the newly built temperature set;

in addition, when the current running times are detected to be updated, namely the current running times are the historical running times plus 1, and the remainder of the ratio of the current running times to 5 is 2, determining the lowest temperature of the battery cell corresponding to the current running times as a second element value of a newly-built temperature set; for example, as one example, when the driving times are 2, 7, and 12, and the remainder of the ratio to 5 is 2, the driving times are 2, 7, and 12 are the second element values in the newly-built temperature set;

And then, when the current running times are detected to be updated, namely the current running times are 1 added to the historical running times, and the remainder of the ratio of the current running times to 5 is 0, determining the lowest temperature of the battery cell corresponding to the current running times as a fifth element value of a newly-built temperature set; for example, as one example, when the driving times are 5, 10, and 15, and the remainder of the ratio to 5 is 0, the driving times are 5, 10, and 15 are the fifth element value in the newly-built temperature set;

it should be noted that the bottom layer and the application layer of the VCU store the same number of driving times to ensure the consistency of the data.

In some embodiments, after determining the temperature set to which the lowest temperature of the battery cell belongs when the vehicle is traveling at a time, further comprising:

under the condition that the difference value between the lowest temperatures of the electric cores acquired in two adjacent times in the temperature set is detected to be larger than a preset difference value, updating the lowest temperatures of the electric cores except the lowest temperature of the electric cores in the temperature set when the electric cores run at the time to be initial temperature values; or,

and under the condition that the difference value of the time for acquiring the lowest temperature of the battery cell in the two adjacent times in the temperature set is larger than a preset time value, updating the lowest temperature of the battery cell except the lowest temperature of the battery cell in the current running in the temperature set to be an initial temperature value.

Specifically, the preset difference may be determined according to practical situations, for example, may be 10 ℃, 12 ℃, etc.; the initial temperature value can be determined according to the requirement, such as 25deg.C, 30deg.C, etc

Specifically, when the difference between the lowest temperatures of the electric cores acquired in two adjacent times is larger than the preset difference, the fact that the temperature difference between the electric core temperatures acquired in two adjacent times is larger is indicated that the current environment temperature difference is larger is that the lowest temperature of the electric core corresponding to the current running in the temperature set is reserved, and the lowest temperatures of other electric cores in the temperature set are updated to initial temperature values.

In addition, when the difference value of the time for acquiring the lowest temperature of the battery cell in two adjacent times in the temperature set is larger than the preset difference value, which indicates that the time for the adjacent running of the vehicle is longer, for example, the preset difference value is ten days, the lowest temperature of the battery cell corresponding to the current running in the temperature set is reserved, and the lowest temperature of other battery cells in the temperature set is updated to be the initial temperature value.

By resetting the lowest temperature of the battery core in the temperature set, if the temperature difference of the running of the vehicle is larger in a few times or the date interval time corresponding to the adjacent stored temperatures is longer, only the lowest temperature of the battery core when the vehicle runs currently is reserved, and the lowest temperatures of other stored battery cores are set as initial temperature values, so that the lowest temperature of the battery core when the vehicle runs currently can be ensured to be used as the lowest temperature of the actual battery core in a low-temperature environment, the lowest temperature of the battery core when the vehicle runs currently in the temperature set before the reference is avoided when the temperature difference is larger, the lowest temperature of the battery core when the vehicle runs currently is used as the lowest temperature of the battery core when the vehicle runs currently in the temperature set, the obtained lowest temperature of the battery core is close to the latest environment temperature, and the target SOC offset value determined according to the lowest temperature of the battery core is more reasonable later.

In some embodiments, determining the target SOC offset according to the temperature set and a correspondence between a preset cell temperature and a battery state of charge SOC offset includes:

selecting the minimum lowest temperature of the battery cell from the temperature set;

under the condition that the minimum cell minimum temperature exists in the corresponding relation, determining the SOC offset corresponding to the minimum cell minimum temperature as the target SOC offset;

and under the condition that the minimum cell minimum temperature does not exist in the corresponding relation, selecting a reference cell temperature with the minimum absolute value of a difference value between the minimum cell minimum temperature and the reference cell temperature in the corresponding relation, and determining the SOC offset corresponding to the reference cell temperature as a target SOC offset.

Specifically, when the minimum cell minimum temperature exists in the corresponding relation, the SOC offset corresponding to the minimum cell minimum temperature is directly determined as the target SOC offset.

And under the condition that the minimum cell minimum temperature does not exist in the corresponding relation, selecting a reference cell temperature with the minimum absolute value of a difference value between the minimum cell minimum temperature and the reference cell temperature in the corresponding relation, and determining the SOC offset corresponding to the reference cell temperature as a target SOC offset. As an example, when the cell temperature in table 1 does not have the cell minimum temperature, such as the cell minimum temperature of-16 ℃, since-16 ℃ is between-20 ℃ and-10 ℃ and the absolute value of the difference between-16 ℃ and-20 ℃ is smaller than the absolute value of the difference between-16 ℃ and-10 ℃, the cell temperature of-20 ℃ is taken as the reference cell temperature, at which point the target SOC offset amount may be determined to be 20%.

In addition, if the minimum cell minimum temperature does not exist in the corresponding relation, an average value of target SOC offset corresponding to two end point temperatures corresponding to the minimum cell minimum temperature is selected in the corresponding relation as the target SOC offset corresponding to the minimum cell temperature; for example, when the lowest temperature of the battery cell is-16 ℃, taking the average value of the SOC offset corresponding to-10 ℃ and the SOC offset corresponding to-20 ℃ as the target SOC offset corresponding to-16 ℃, namely, the target SOC offset is 15%.

Therefore, the battery SOC offset corresponding to the lowest battery cell temperature in the temperature interval can be obtained as the SOC offset corresponding to the temperature interval, the SOC offset can be met in a low-temperature environment, the operation is convenient, and the data acquisition amount and the calculation cost are reduced.

Further, the vehicle power after initial SOC adjustment will be described below.

Table 2 below shows the battery discharge capacities map for battery cells at different temperatures and different SOCs:

TABLE 2

According to the battery discharge capacity map in table 2, the discharge power corresponding to different cell temperatures when the initial SOC value of the pure power priority mode is 20 is as follows:

TABLE 3 Table 3

X	-30	-20	-10	0	10	20	30	40	50
										Y	11.7	22.2	37.4	53.3	83.9	136.9	188.1	188.1	188.1

TABLE 3 minimum cell temperature-battery discharge power

Wherein, the X axis represents the lowest temperature value of the battery core of the power battery, and the Y axis represents the battery discharge power of the battery with the charge state of 20% corresponding to the lowest temperature of the battery core, and the unit is kw.

Then, the initial SOC value is adjusted according to the obtained SOC offset value, and an adjustment formula can be as follows: SOC (State of Charge) _Adjust ＝SOC _Target +SOC _Offset ；

SOC in the above _Target For initial SOC value, SOC _offset For the SOC offset value adjusted according to the minimum temperature of the battery cell stored for the preset times, the SOC _Adjust And when the SOC value of the battery charge state is smaller than the adjusted target SOC value, the VCU controls the range extender to be started. The correspondence between the adjusted SOC threshold and the lowest cell temperature is obtained according to table 1 and the initial SOC threshold of 20%, as follows:

TABLE 4 Table 4

X	-30	-20	-10	0	10	20	30	40	50
										Y	50	40	30	20	20	20	20	20	20

The X axis is the minimum temperature of the battery core of the near preset battery, the Y axis is the adjusted target SOC value, and when the current SOC is lower than the target SOC value, the VCU controls the range extender to start.

The adjusted battery discharge power at different temperatures can be obtained after adjusting the target SOC in the pure electric priority mode according to table 4 as shown in table 5 below:

TABLE 5

X	-30	-20	-10	0	10	20	30	40	50
										Y	21.4	32.3	50.5	83.9	136.9	188.1	188.1	188.1	188.1

The X axis is the minimum temperature of the battery core of the battery with the times being nearly preset, and the Y axis is the battery discharge power corresponding to the adjusted target SOC value at different temperatures.

After adjusting the target SOC in the pure electric priority mode according to table 1, it can be summarized by comparing table 3 with table 5: after the target SOC is adaptively adjusted according to the lowest temperature of the battery core of the power battery, the battery discharge power corresponding to the same battery core temperature at low temperature is improved by about 10kw, and parameters of table 1 can be further optimized according to basic power requirements of different vehicle types and vehicles, so that the power performance of the vehicles at low temperature is improved.

In some embodiments, the adjusting the initial SOC value according to the target SOC offset, after obtaining the target SOC value, further includes:

controlling a range extender to start under the condition that the current SOC value of the vehicle is detected to be smaller than the target SOC value; and controlling the range extender to stop running under the condition that the current SOC value of the vehicle is detected to be greater than or equal to the target SOC value.

Specifically, when the current SOC value is detected to be smaller than the target SOC value, the range extender can be controlled to start, otherwise, the range extender is controlled to close.

When the electric quantity of the power battery is sufficient, the pure electric mode is used, the range extender is closed, and the power battery is the only power source and is equivalent to a pure electric vehicle. The energy of the power battery can meet the power requirements of the vehicle for starting, accelerating, climbing, idling, driving accessories such as an automobile air conditioner and the like. When the SOC of the power battery is smaller than the adjusted target SOC, the vehicle enters a range extender working mode, the SOC of the power battery is maintained to fluctuate within a small range of the adjusted target SOC, the power battery and the engine are combined to drive the whole vehicle to run, and when the required power is large, the power battery compensates for the part of insufficient power of the engine. For example, when the weather is cold, the power requirement of the air conditioner should be considered, if the driving road is more on an uphill road, the power requirement of the whole vehicle is correspondingly large, and then the required SOC offset value is determined by referring to table 1.

In some embodiments, after starting the range extender, at least one of the following is further included:

controlling the engine coolant to be transmitted to a warm air device through a heat exchanger under the condition that the temperature of the engine coolant is detected to be greater than a preset value, wherein the warm air device is used for transmitting hot air into a cabin of the vehicle; and controlling the engine cooling liquid to be transmitted to the battery pack through a heat exchanger for heating the battery pack.

Because the target SOC of the pure electric priority mode is adjusted according to the temperature of the battery core, the intervention time of the range extender is advanced, and after the range extender is warmed up, the temperature of the cooling liquid of the engine is increased. The preset value CAN be set to 65 ℃, 70 ℃, 75 ℃ and the like, the temperature sensor sends the detected temperature of the engine cooling liquid to the VCU through the CAN, when the VCU detects that the temperature of the engine cooling liquid is higher than the preset value, the VCU controls the engine cooling liquid to flow into the warm air device through the heat exchanger, the heated engine cooling liquid is connected with a warm air system of a vehicle through the heat exchanger, the cooling liquid in the heat exchanger absorbs waste heat generated by the engine and transfers the heat to a warm air system in the passenger cabin, and finally the warm air system sends hot air into the passenger cabin.

In addition, when the VCU detects that the temperature of the engine cooling liquid is higher than a preset value, the engine cooling liquid is controlled to be transmitted to the battery pack through the heat exchanger, the heated engine cooling liquid is transmitted to the battery pack through the heat exchanger to heat the battery, and meanwhile, the battery cell temperature is increased, and meanwhile, the charging and discharging power of the battery can be increased, so that the performance of the vehicle at a low temperature is improved.

In summary, this embodiment can effectively reduce the power consumption of battery at low temperature, alleviate the operating pressure of battery, let the battery can be used for the drive with more discharge power to this improves the dynamic performance of vehicle at low temperature, can utilize to increase Cheng Qiyu temperature and preheat and heat the group battery, promotes the dynamic nature, the power-conserving ability of range-extending electric automobile, prevents that low target SOC is too low and the battery electric quantity decline is too fast under range extender warmup working condition, leads to the feed risk.

In addition, the embodiment can also control the power of the torque output of the motor, and adjust and distribute the output torque of the front and rear driving motor according to the requirements of a driver and the information of the vehicle body posture, the wheel state, the current working condition of the vehicle and the like, so that the operation stability, the running safety and the comfort of the vehicle are improved.

Any combination of the above optional solutions may be adopted to form an optional embodiment of the present application, which is not described herein in detail.

The following are device embodiments of the present application, which may be used to perform method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

Fig. 4 is a schematic diagram of a device for adjusting a battery state of charge according to an embodiment of the present application. As shown in fig. 4, the battery state of charge adjusting device includes:

a first determining module 401, configured to determine, when the number of times of travel of the vehicle is detected to be updated, a lowest temperature of the battery cell of the vehicle when the vehicle is traveling at the time;

a second determining module 402, configured to determine a temperature set to which a lowest temperature of a battery cell of the vehicle when the vehicle is currently traveling belongs, where an element in the temperature set is the lowest temperature of the battery cell corresponding to each traveling in a preset traveling number, and each traveling corresponding to the preset traveling number is an adjacent traveling;

a third determining module 403, configured to determine, when detecting that an element in the temperature set corresponds to an element value, a target SOC offset according to the temperature set and a correspondence between a preset battery cell temperature and a battery state of charge SOC offset, where the SOC offset is greater than zero when the battery cell temperature is lower than a preset temperature value;

And the adjustment module 404 is configured to adjust the initial SOC value according to the target SOC offset, to obtain a target SOC value.

In some embodiments, the first determining module is further configured to detect, when it is detected that the high-voltage status flag bit of the vehicle indicates high voltage on the vehicle, whether a difference between a current time and a recording time of a number of times of driving before updating is greater than a preset time; acquiring the current running speed of the vehicle under the condition that the current running speed is larger than the preset time; and under the condition that the current running speed is larger than a preset running speed, determining the current running of the vehicle as effective running, and updating the running times.

In some embodiments, the second determining module is specifically configured to determine, when a remainder of a ratio of the updated current running number to the preset running number is 1, the current running number as a starting number of the preset running number; under the condition that the remainder of the ratio of the updated current running times to the preset running times is 0, determining the current running times as the ending times of the preset running times; determining the lowest temperature of the battery cell corresponding to the starting times and the ending times and the lowest temperature of the battery cell corresponding to the running times between the starting times and the ending times, wherein the lowest temperature of the battery cell and the lowest temperature of the battery cell belong to the same temperature set.

In some embodiments, the second determining module is further configured to update, when it is detected that a difference between the lowest temperatures of the cells acquired two adjacent times in the temperature set is greater than a preset difference, a lowest temperature of the cells in the temperature set other than the lowest temperature of the cells when the vehicle is running at the time to the initial temperature value; or under the condition that the difference value of the time for acquiring the lowest temperature of the battery cell in the two adjacent times in the temperature set is detected to be larger than a preset time value, updating the lowest temperature of the battery cell except the lowest temperature of the battery cell in the temperature set at present to be the initial temperature value.

In some embodiments, the third determining module is specifically configured to select a minimum cell minimum temperature from the temperature set; under the condition that the minimum cell minimum temperature exists in the corresponding relation, determining the SOC offset corresponding to the minimum cell minimum temperature as the target SOC offset; and under the condition that the minimum cell minimum temperature does not exist in the corresponding relation, selecting a reference cell temperature with the minimum absolute value of a difference value with the minimum cell minimum temperature in the corresponding relation, and determining an SOC offset corresponding to the reference cell temperature as the target SOC offset.

In some embodiments, the third determining module is further configured to control a range extender to start if it is detected that the current SOC value of the vehicle is less than the target SOC value; and controlling the range extender to stop running under the condition that the current SOC value of the vehicle is detected to be greater than or equal to the target SOC value.

In some embodiments, the third determining module is further configured to control, in case that the temperature of the engine coolant is detected to be greater than a preset value, the engine coolant to be transferred to a warm air device through a heat exchanger, the warm air device being configured to transfer hot air into a cabin of the vehicle; and controlling the engine cooling liquid to be transmitted to the battery pack through a heat exchanger for heating the battery pack.

It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.

Fig. 5 is a schematic diagram of an electronic device 5 provided in an embodiment of the present application. As shown in fig. 5, the electronic apparatus 5 of this embodiment includes: a processor 501, a memory 502 and a computer program 503 stored in the memory 502 and executable on the processor 501. The steps of the various method embodiments described above are implemented by processor 501 when executing computer program 503. Alternatively, the processor 501, when executing the computer program 503, performs the functions of the modules/units in the above-described apparatus embodiments.

The electronic device 5 may be a desktop computer, a notebook computer, a palm computer, a cloud server, or the like. The electronic device 5 may include, but is not limited to, a processor 501 and a memory 502. It will be appreciated by those skilled in the art that fig. 5 is merely an example of the electronic device 5 and is not limiting of the electronic device 5 and may include more or fewer components than shown, or different components.

The processor 501 may be a central processing unit (Central Processing Unit, CPU) or other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like.

The memory 502 may be an internal storage unit of the electronic device 5, for example, a hard disk or a memory of the electronic device 5. The memory 502 may also be an external storage device of the electronic device 5, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the electronic device 5. Memory 502 may also include both internal storage units and external storage devices of electronic device 5. The memory 502 is used to store computer programs and other programs and data required by the electronic device.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium (e.g., a computer readable storage medium). Based on such understanding, the present application implements all or part of the flow in the methods of the above embodiments, or may be implemented by a computer program to instruct related hardware, and the computer program may be stored in a computer readable storage medium, where the computer program may implement the steps of the respective method embodiments described above when executed by a processor. The computer program may comprise computer program code, which may be in source code form, object code form, executable file or in some intermediate form, etc. The computer readable storage medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A method for adjusting a state of charge of a battery, comprising:

determining a temperature set of the lowest temperature of the battery cell of the vehicle when the vehicle runs at the time, wherein elements in the temperature set are the lowest temperature of the battery cell corresponding to each running in preset running times, and each running corresponding to the preset running times is adjacent running;

2. The method of claim 1, wherein the detecting the update of the number of vehicle travels comprises:

detecting whether the difference between the current time and the recording time of the running times before updating is larger than the preset time or not under the condition that the high-voltage state zone bit of the vehicle is detected to indicate the high voltage on the vehicle;

acquiring the current running speed of the vehicle under the condition that the current running speed is larger than the preset time;

and under the condition that the current running speed is larger than a preset running speed, determining the current running of the vehicle as effective running, and updating the running times.

3. The method of claim 1, wherein determining the temperature set to which the lowest temperature of the battery cell when traveling at a time belongs comprises:

4. The method of claim 1, wherein the determining the temperature set to which the lowest temperature of the battery cell of the vehicle belongs when traveling next further comprises:

under the condition that the difference value between the lowest temperatures of the electric cores acquired in two adjacent times in the temperature set is detected to be larger than a preset difference value, updating the lowest temperatures of the electric cores in the temperature set except the lowest temperature of the electric cores in the current driving to be initial temperature values; or,

and under the condition that the difference value of the time for acquiring the lowest temperature of the battery cell in the temperature set in two adjacent times is larger than a preset time value, updating the lowest temperature of the battery cell except the lowest temperature of the battery cell in the temperature set at present to the initial temperature value.

5. The method of claim 1, wherein determining the target SOC offset based on the temperature set and a correspondence between a preset cell temperature and a battery state of charge SOC offset comprises:

and under the condition that the minimum cell minimum temperature does not exist in the corresponding relation, selecting a reference cell temperature with the minimum absolute value of a difference value with the minimum cell minimum temperature in the corresponding relation, and determining an SOC offset corresponding to the reference cell temperature as the target SOC offset.

6. The method of claim 1, wherein the adjusting the initial SOC value according to the target SOC offset value, after obtaining the target SOC value, further comprises:

controlling a range extender to start under the condition that the current SOC value of the vehicle is detected to be smaller than the target SOC value;

and controlling the range extender to stop running under the condition that the current SOC value of the vehicle is detected to be greater than or equal to the target SOC value.

7. The method of claim 6, further comprising at least one of the following after the control extender is activated:

Controlling the engine coolant to be transmitted to a warm air device through a heat exchanger under the condition that the temperature of the engine coolant is detected to be greater than a preset value, wherein the warm air device is used for transmitting hot air into a cabin of the vehicle;

and controlling the engine cooling liquid to be transmitted to the battery pack through a heat exchanger for heating the battery pack.

8. A battery state of charge adjustment device, comprising:

9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when the computer program is executed.

10. A readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 7.