Battery remaining capacity correction method and device, vehicle and storage medium

Abstract

The invention is suitable for the technical field of vehicles, and provides a battery remaining capacity correction method and device, a vehicle and a storage medium. The battery remaining capacity correction method comprises the following steps: acquiring the discharge voltage, the discharge current and the remaining capacity of a first single battery; the first single battery is the single battery with the minimum voltage value in the battery pack; if the discharge voltage of the first single battery is smaller than the discharge cut-off voltage and the discharge current of the first single battery is smaller than the preset current, determining the open-circuit voltage of the first single battery according to the discharge voltage and the polarization voltage of the first single battery; if the open-circuit voltage of the first single battery is smaller than the preset open-circuit voltage, correcting the residual electric quantity of the first single battery to be zero; the preset open-circuit voltage is the corresponding open-circuit voltage when the residual electric quantity of the single battery in the battery pack is zero. The problem that the service life of the battery is affected due to the fact that the remaining capacity displayed by the battery is high and the battery is discharged to the tail end and easily causes a battery undervoltage fault can be solved.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and in particular, relates to a battery remaining power correction method, device, vehicle and storage medium. Background Art

[0002] If the vehicle's battery maintains a high SOC (State Of Charge) for a long time without correction, the remaining power displayed by the battery may be too high, which may easily cause a battery undervoltage fault when the battery is discharged to the end, affecting the battery life. Summary of the invention

[0003] The embodiments of the present application provide a battery remaining power correction method, device, vehicle and storage medium, which can solve the problem that the remaining power displayed by the battery is too high, and the battery discharge to the end is prone to cause battery undervoltage failure, which affects the battery life.

[0004] In a first aspect, an embodiment of the present application provides a method for correcting the remaining battery power, comprising:

[0005] Obtaining a discharge voltage of a first single cell, a discharge current of the first single cell, and a remaining power of the first single cell; the first single cell is a single cell with the smallest voltage value in the battery pack;

[0006] If the discharge voltage of the first single cell is less than the discharge cut-off voltage and the discharge current of the first single cell is less than a preset current, the open circuit voltage of the first single cell is determined according to the discharge voltage and polarization voltage of the first single cell; the polarization voltage is the difference between the open circuit voltage and the discharge voltage of the single cell;

[0007] If the open circuit voltage of the first single cell is less than a preset open circuit voltage, the remaining power of the first single cell is corrected to zero; the preset open circuit voltage is the open circuit voltage corresponding to when the remaining power of the single cell in the battery pack is zero.

[0008] In a possible implementation manner of the first aspect, determining the open circuit voltage of the first single cell according to the discharge voltage and the polarization voltage of the first single cell includes:

[0009] The sum of the discharge voltage of the first single cell and the polarization voltage is calculated to obtain the open circuit voltage of the first single cell.

[0010] In a possible implementation manner of the first aspect, the battery remaining power correction method further includes:

[0011] Acquire the current temperature of the first single battery;

[0012] The discharge cut-off voltage is determined according to the current temperature.

[0013] In a possible implementation manner of the first aspect, if the open circuit voltage of the first single cell is less than a preset open circuit voltage, correcting the remaining power of the first single cell to zero includes:

[0014] If the duration that the open circuit voltage of the first single battery cell is less than the preset open circuit voltage is greater than a first preset time, the remaining power of the first single battery cell is corrected to zero.

[0015] In a possible implementation manner of the first aspect, the battery remaining power correction method further includes:

[0016] When the remaining power of the single battery is lower than the preset power, controlling the single battery to discharge, and obtaining the first voltage of the single battery at the end of the discharge;

[0017] Controlling the single cell battery to enter a static state, and obtaining a second voltage of the single cell battery when the duration of the single cell battery being in the static state reaches a second preset time;

[0018] The difference between the second voltage and the first voltage is calculated to obtain the polarization voltage.

[0019] In a possible implementation manner of the first aspect, the battery remaining power correction method further includes:

[0020] Acquiring the remaining power of a second single cell; the second single cell is the single cell with the largest remaining power in the battery pack;

[0021] The remaining power of the second single cell is corrected based on the remaining power correction value of the first single cell to obtain the corrected remaining power of the second single cell; the remaining power correction value of the first single cell is the difference between the remaining power of the first single cell before correction and the remaining power of the first single cell after correction;

[0022] The remaining power of the battery pack is determined based on the corrected remaining power of the first single cell and the corrected remaining power of the second single cell.

[0023] In a possible implementation manner of the first aspect, the correcting the remaining power of the second single battery based on the remaining power correction value of the first single battery to obtain the corrected remaining power of the second single battery includes:

[0024] The remaining power of the second single cell is subtracted from the remaining power correction value of the first single cell to obtain the corrected remaining power of the second single cell.

[0025] In a second aspect, an embodiment of the present application provides a battery remaining power correction device, comprising:

[0026] A first acquisition module is used to acquire a discharge voltage of a first single cell, a discharge current of the first single cell, and a remaining power of the first single cell; the first single cell is a single cell with the smallest voltage value in the battery pack;

[0027] an open circuit voltage determination module, configured to determine the open circuit voltage of the first single cell according to the discharge voltage and polarization voltage of the first single cell if the discharge voltage of the first single cell is less than the discharge cut-off voltage and the discharge current of the first single cell is less than a preset current; the polarization voltage is the difference between the open circuit voltage and the discharge voltage of the single cell;

[0028] The first correction module is used to correct the remaining power of the first single cell to zero if the open circuit voltage of the first single cell is less than a preset open circuit voltage; the preset open circuit voltage is the open circuit voltage corresponding to when the remaining power of the single cell in the battery pack is zero.

[0029] In a third aspect, an embodiment of the present application provides a vehicle, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the methods described in the first aspect when executing the computer program.

[0030] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in any one of the first aspects is implemented.

[0031] In a fifth aspect, an embodiment of the present application provides a computer program product, which, when executed on a vehicle, enables the vehicle to execute any of the methods described in the first aspect.

[0032] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0033] When the battery of the vehicle is in working state, the discharge voltage of the first single cell, the discharge current of the first single cell and the remaining power of the first single cell are obtained. The first single cell is the single cell with the smallest voltage value in the battery pack. If the discharge voltage of the first single cell is less than the discharge cut-off voltage and the discharge current of the first single cell is less than the preset current, it means that the current discharge voltage of the first single cell is too low and the current discharge current of the battery is relatively small. At this time, the open circuit voltage of the first single cell is determined according to the discharge voltage and polarization voltage of the first single cell (the polarization voltage is the difference between the open circuit voltage and the discharge voltage of the single cell). If the open circuit voltage of the first single cell is less than the preset open circuit voltage (the preset open circuit voltage is the open circuit voltage corresponding to the remaining power of the single cell in the battery pack is zero), it means that the remaining power of the first single cell should be zero at this time. If the remaining power of the first single cell is not zero at this time, the remaining power of the first single cell is corrected to zero. When the vehicle recognizes that the remaining power of the first single cell is zero, the first single cell is prohibited from continuing to discharge, so as to prevent the first single cell from over-discharging and causing undervoltage fault, thereby extending the service life of the battery.

[0034] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 It is a flowchart of a battery remaining power correction method provided by an embodiment of the present application;

[0037] Figure 2 is a flowchart of a battery remaining power correction method provided by another embodiment of the present application;

[0038] Figure 3 is a flowchart of a battery remaining power correction method provided by another embodiment of the present application;

[0039] Figure 4 is a structural schematic diagram of a battery remaining power correction device provided in an embodiment of the present application;

[0040] Figure 5 It is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0042] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0043] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0044] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0045] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0046] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0047] If the vehicle's battery maintains a high SOC (State Of Charge) for a long time without correction, as the ampere-hour integral cumulative error increases, the remaining power displayed by the battery may be too high, which may easily cause a battery undervoltage fault at the end of battery discharge, affecting the battery life. For example, the actual remaining power of the battery is 0%, but the remaining power displayed is 5%. At this time, the vehicle still controls the battery to discharge, causing a battery undervoltage fault, affecting the battery life.

[0048] Based on the above problems, the present application provides a method for correcting the remaining battery power. Figure 1 As shown, the battery remaining power correction method includes steps S101 to S103.

[0049] Step S101, obtaining the discharge voltage of a first single cell, the discharge current of the first single cell and the remaining power of the first single cell; the first single cell is the single cell with the smallest voltage value in the battery pack.

[0050] Specifically, when the battery of the vehicle is in a working state, that is, when the battery of the vehicle is in a discharging state, the voltage value of each single cell in the battery pack is obtained, and then the single cell with the smallest voltage value is selected as the first single cell. After the first single cell is determined, the discharge current of the first single cell and the remaining power of the first single cell are obtained.

[0051] Step S102 : if the discharge voltage of the first single cell is less than the discharge cut-off voltage and the discharge current of the first single cell is less than the preset current, determine the open circuit voltage of the first single cell according to the discharge voltage and polarization voltage of the first single cell.

[0052] Specifically, the discharge cut-off voltage is the minimum voltage allowed for the battery to discharge, that is, when the battery voltage is greater than the discharge cut-off voltage, the battery is allowed to discharge; if the battery voltage is less than the discharge cut-off voltage, the battery may be over-discharged and cause an undervoltage fault.

[0053] If the discharge voltage of the first single cell is less than the discharge cut-off voltage and the discharge current of the first single cell is less than the preset current, it means that the voltage of the first single cell is too low and the current is small. If the first single cell continues to discharge at this time, there may be a risk of over-discharge leading to undervoltage failure. At this time, the open circuit voltage of the first single cell is determined according to the discharge voltage and polarization voltage of the first single cell. The polarization voltage is the difference between the open circuit voltage and the discharge voltage of the single cell.

[0054] The discharge cut-off voltage of the battery is affected by the battery, that is, the discharge cut-off voltage is different when the battery temperature is different. Designers can set the corresponding relationship between the temperature of the single cell and the discharge cut-off voltage according to the battery parameters in advance, and store the corresponding relationship between the temperature of the single cell and the discharge cut-off voltage in the database.

[0055] When determining the discharge cut-off voltage, the current temperature of the first single battery is first acquired, and then the discharge cut-off voltage is determined according to the current temperature.

[0056] Specifically, the current temperature of the first single cell is used by a sensor on the vehicle, or the temperature of the area where the first single cell is located is collected by a sensor, and the temperature is used as the current temperature of the first single cell. After the current temperature of the first single cell is determined, the discharge cut-off voltage can be determined according to the current temperature and the stored correspondence between the temperature and the discharge cut-off voltage. Thus, the corresponding discharge cut-off voltage is determined according to the temperature of the first single cell, which improves the accuracy of determining the discharge cut-off voltage, and further improves the accuracy of determining whether the first single cell has an undervoltage fault caused by over-discharge.

[0057] In some embodiments, the open circuit voltage of the first single cell includes: calculating the sum of the discharge voltage and the polarization voltage of the first single cell to obtain the open circuit voltage of the first single cell.

[0058] Specifically, the polarization voltage is the difference between the open circuit voltage of the single cell and the discharge voltage of the single cell. The current open circuit voltage of the first single cell can be obtained by adding the discharge voltage of the first single cell to the polarization voltage.

[0059] In some embodiments, Figure 2 As shown, the method for determining the polarization voltage includes steps S201 to S203.

[0060] Step S201 : when the remaining power of a single cell is lower than a preset power, the single cell is controlled to discharge, and a first voltage of the single cell is obtained at the end of the discharge.

[0061] Specifically, in the case of low power, the polarization of the battery will be more obvious. Therefore, when the polarization voltage is determined when the remaining power of the battery is low, that is, when the remaining power of the single cell is lower than the preset power, the polarization voltage of the single cell is determined.

[0062] When the remaining power of the single cell is lower than the preset power, the single cell is controlled to discharge so as to polarize the single cell, and the voltage of the single cell is obtained at the end of the discharge, that is, the first voltage is obtained.

[0063] It should be noted that the designer may set the preset power according to actual conditions. For example, the preset power may be set to 15%, 20%, 25% or other values.

[0064] Step S202: Control the single cell battery to enter a static state, and obtain a second voltage of the single cell battery when the duration of the single cell battery being in the static state reaches a second preset time.

[0065] Specifically, the single cell is controlled to enter a static state, in which the single cell is neither charged nor discharged. After the single cell stops discharging, the voltage gradually increases. After the single cell is static for a sufficient period of time, the voltage of the single cell reaches a stable state, at which time the voltage of the single cell is an open circuit voltage. Therefore, when the duration of the single cell in the static state reaches a second preset time, the voltage of the single cell is obtained, that is, the second voltage is obtained.

[0066] It should be noted that the designer may set the second preset time according to actual conditions. For example, the second preset time may be set to 1 hour, 1.5 hours, 2 hours or other time.

[0067] Step S203, calculating the difference between the second voltage and the first voltage to obtain the polarization voltage.

[0068] Specifically, after the first voltage and the second voltage are determined, the difference between the second voltage and the first voltage is calculated to obtain the polarization voltage corresponding to the single cell.

[0069] It should be noted that the designer may set the preset current according to actual conditions. For example, the preset current may be set to 8A, 9A, 10A or other values.

[0070] Step S103 , if the open circuit voltage of the first single cell is less than a preset open circuit voltage, the remaining power of the first single cell is corrected to zero; the preset open circuit voltage is the open circuit voltage corresponding to when the remaining power of the single cell in the battery pack is zero.

[0071] Specifically, the preset open circuit voltage is the open circuit voltage corresponding to when the remaining power of the single cell in the battery pack is zero. The designer can determine the preset open circuit voltage based on the parameter information of the battery and store the preset open circuit voltage in the database. After determining the open circuit voltage of the first single cell, the open circuit voltage of the first single cell is compared with the preset open circuit voltage. If the open circuit voltage of the first single cell is less than the preset open circuit voltage, it means that the remaining power of the first single cell should be zero. At this time, if the remaining power of the first single cell is not zero, the remaining power of the first single cell is corrected to zero. When the vehicle recognizes that the remaining power of the first single cell is zero, the first single cell is prohibited from continuing to discharge, so as to prevent the first single cell from over-discharging and causing an undervoltage fault, thereby extending the service life of the battery.

[0072] When calculating the open circuit voltage of the first single cell, errors may occur in the calculation of the open circuit voltage of the first single cell due to errors in the collected discharge voltage of the first single cell or other factors, which may lead to incorrect correction of the remaining power of the first single cell.

[0073] Based on the above problems, in the present application, when determining whether it is necessary to correct the remaining power of the first single cell battery, it is necessary to determine whether the duration of the open circuit voltage of the first single cell battery being less than the preset open circuit voltage reaches the preset time. If the duration of the open circuit voltage of the first single cell battery being less than the preset open circuit voltage is greater than the first preset time, the open circuit voltage of the first single cell battery will be calculated multiple times within the first preset time, and the open circuit voltage of the first single cell battery calculated each time will be compared with the preset open circuit voltage. If the open circuit voltage of the first single cell battery obtained each time is less than the preset open circuit voltage, it means that there is no error in the calculation of the open circuit voltage of the first single cell battery, and the remaining power of the first single cell battery reaches the correction adjustment. At this time, the remaining power of the first single cell battery is corrected to zero, thereby improving the accuracy of the correction of the remaining power of the first single cell battery.

[0074] In some embodiments, Figure 3 As shown, the battery remaining power correction method further includes steps S301 to S303.

[0075] Step S301, obtaining the remaining power of the second single cell; the second single cell is the single cell with the largest remaining power in the battery pack.

[0076] Specifically, when the battery of the vehicle is in a working state, that is, when the battery of the vehicle is in a discharging state, the remaining power of each single cell in the battery pack is obtained, and then the single cell with the largest remaining power is selected as the second single cell.

[0077] Step S302, based on the remaining power correction value of the first single cell, the remaining power of the second single cell is corrected to obtain the corrected remaining power of the second single cell; the remaining power correction value of the first single cell is the difference between the remaining power of the first single cell before correction and the remaining power of the first single cell after correction.

[0078] Specifically, after the remaining power of the first cell is corrected, the remaining power of the first cell before correction is subtracted from the remaining power of the first cell after correction to obtain the corrected value of the remaining power of the first cell. Then, the remaining power of the second cell is subtracted from the corrected value of the remaining power of the first cell to obtain the corrected remaining power of the second cell. Thus, the correction of the remaining power of the second cell is completed. This correction of the remaining power of the second cell ensures that the corrected value of the remaining power of the second cell is the same as the corrected value of the remaining power of the first cell.

[0079] Step S303 : determining the remaining power of the battery pack based on the corrected remaining power of the first single cell and the corrected remaining power of the second single cell.

[0080] Specifically, after the remaining power of the first single cell and the remaining power of the second single cell are corrected, that is, after the single cell with the largest remaining power and the single cell with the smallest remaining power in the battery pack are corrected, the corrected remaining power of the first single cell and the corrected remaining power of the second single cell are weightedly calculated to obtain the remaining power of the battery pack, and the correction of the remaining power of the battery pack is completed, which improves the accuracy of the remaining power of the battery pack, prevents the battery pack from being over-discharged and causing undervoltage faults, and has the effect of extending the service life of the battery pack.

[0081] In order to clearly illustrate the working principle of the battery remaining power correction method of the present application, a specific example is given below for illustration.

[0082] When the remaining power of the single cell is less than 25%, the single cell is controlled to discharge at 1C for 10 seconds, and the first voltage of the single cell is obtained at the end of the discharge. Then the single cell is controlled to enter a static state, and the second voltage of the single cell is obtained when the duration of the single cell in the static state reaches 1 hour. Finally, the difference between the second voltage and the first voltage is calculated to obtain the polarization voltage.

[0083] When the vehicle is in working state, that is, when the battery of the vehicle is in discharging state, the discharge voltage, discharge voltage and remaining power of each cell of the battery pack are obtained. Then, the cell with the smallest voltage value in the battery is determined as the first cell, and the cell with the largest remaining power is determined as the second cell.

[0084] If the discharge voltage of the first single cell is less than the discharge cut-off voltage and the discharge current of the first single cell is less than 10A, the sum of the discharge voltage and polarization voltage of the first single cell is calculated to obtain the open circuit voltage of the first single cell. If the open circuit voltage of the first single cell is less than the preset open circuit voltage, the remaining power of the first single cell is corrected to zero; the preset open circuit voltage is the open circuit voltage corresponding to the case where the remaining power of the single cell in the battery pack is zero. When the vehicle recognizes that the remaining power of the first single cell is zero, the first single cell is prohibited from continuing to discharge, so as to prevent the first single cell from over-discharging and causing undervoltage fault, thereby extending the service life of the battery.

[0085] When the remaining power of the first single cell is corrected, the remaining power of the first single cell before correction is subtracted from the remaining power of the first single cell after correction to obtain the corrected value of the remaining power of the first single cell. Then, the remaining power of the second single cell is subtracted from the corrected value of the remaining power of the first single cell to obtain the corrected remaining power of the second single cell. Thus, the correction of the remaining power of the second single cell is completed. This correction of the remaining power of the second single cell ensures that the corrected value of the remaining power of the second single cell is the same as the corrected value of the remaining power of the first single cell.

[0086] After the remaining power of the first single cell and the remaining power of the second single cell are corrected, that is, after the single cell with the largest remaining power and the single cell with the smallest remaining power in the battery pack are corrected, the corrected remaining power of the first single cell and the corrected remaining power of the second single cell are weightedly calculated to obtain the remaining power of the battery pack, and the correction of the remaining power of the battery pack is completed, which improves the accuracy of the remaining power of the battery pack, prevents the battery pack from being over-discharged and causing undervoltage faults, and has the effect of extending the service life of the battery pack.

[0087] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0088] Figure 4 The structure diagram of the battery remaining power correction device provided by the embodiment of the present application is shown. Figure 4 As shown, the battery remaining power correction device includes:

[0089] The first acquisition module 41 is used to acquire the discharge voltage of the first single cell, the discharge current of the first single cell and the remaining power of the first single cell; the first single cell is the single cell with the smallest voltage value in the battery pack;

[0090] an open circuit voltage determination module 42, configured to determine the open circuit voltage of the first single cell according to the discharge voltage and polarization voltage of the first single cell if the discharge voltage of the first single cell is less than the discharge cut-off voltage and the discharge current of the first single cell is less than a preset current; the polarization voltage is the difference between the open circuit voltage and the discharge voltage of the single cell;

[0091] The first correction module 43 is used to correct the remaining power of the first single cell to zero if the open circuit voltage of the first single cell is less than a preset open circuit voltage; the preset open circuit voltage is the open circuit voltage corresponding to the remaining power of the single cell in the battery pack is zero.

[0092] In some embodiments, the open circuit voltage determination module 42 is further configured to:

[0093] The sum of the discharge voltage of the first single cell and the polarization voltage is calculated to obtain the open circuit voltage of the first single cell.

[0094] In some embodiments, the battery remaining power correction device further includes:

[0095] A second acquisition module, used to acquire the current temperature of the first single battery;

[0096] A discharge cut-off voltage determination module is used to determine the discharge cut-off voltage according to the current temperature.

[0097] In some embodiments, the first correction module is further configured to:

[0098] If the duration that the open circuit voltage of the first single battery cell is less than the preset open circuit voltage is greater than a first preset time, the remaining power of the first single battery cell is corrected to zero.

[0099] In some embodiments, the battery remaining power correction device further includes:

[0100] A first voltage determination module, used to control the single cell to discharge when the remaining power of the single cell is lower than a preset power, and obtain a first voltage of the single cell at the end of the discharge;

[0101] A second voltage determination module, used for controlling the single cell battery to enter a static state, and obtaining a second voltage of the single cell battery when the duration of the single cell battery being in the static state reaches a second preset time;

[0102] A polarization voltage determination module is used to calculate the difference between the second voltage and the first voltage to obtain the polarization voltage.

[0103] In some embodiments, the battery remaining power correction device further includes:

[0104] A third acquisition module is used to acquire the remaining power of a second single cell; the second single cell is the single cell with the largest remaining power in the battery pack;

[0105] A second correction module, used to correct the remaining power of the second single cell based on the remaining power correction value of the first single cell to obtain the corrected remaining power of the second single cell; the remaining power correction value of the first single cell is the difference between the remaining power of the first single cell before correction and the remaining power of the first single cell after correction;

[0106] The third correction module is used to determine the remaining power of the battery pack based on the corrected remaining power of the first single battery and the corrected remaining power of the second single battery.

[0107] In some embodiments, the second correction module is further configured to:

[0108] The remaining power of the second single cell is subtracted from the remaining power correction value of the first single cell to obtain the corrected remaining power of the second single cell.

[0109] The technicians in the relevant field 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 for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or 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 each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0110] Figure 5 This is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application. Figure 5 As shown, the vehicle 5 of this embodiment may include: at least one processor 50 ( Figure 5 Only one processor 50 is shown in the figure), a memory 51, and a computer program 52 stored in the memory 51 and executable on the at least one processor 50. When the processor 50 executes the computer program 52, the steps in any of the above-mentioned method embodiments are implemented, for example Figure 1 Steps S101 to S103 in the illustrated embodiment. Alternatively, when the processor 50 executes the computer program 52, the functions of each module / unit in the above-mentioned device embodiments are implemented, for example Figure 4 The functions of modules 41 to 43 are shown.

[0111] Exemplarily, the computer program 52 may be divided into one or more modules / units, which are stored in the memory 51 and executed by the processor 50 to implement the present invention. The one or more modules / units may be a series of computer program 52 instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program 52 in the vehicle 5.

[0112] The embodiment of the present application further provides a computer-readable storage medium, which stores a computer program 52. When the computer program 52 is executed by the processor 50, the steps in the above-mentioned method embodiments can be implemented.

[0113] An embodiment of the present application provides a computer program product. When the computer program product is run on a vehicle, the vehicle can implement the steps in the above-mentioned method embodiments when the computer program product is executed.

[0114] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program 52, and the computer program 52 can be stored in a computer-readable storage medium. When the computer program 52 is executed by the processor 50, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program 52 includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device capable of carrying the computer program code to the terminal, a recording medium, a computer memory, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), an electric carrier signal, a telecommunication signal and a software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0115] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0116] Those of ordinary skill in the art will appreciate 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. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0117] In the embodiments provided in the present application, it should be understood that the disclosed devices / network equipment and methods can be implemented in other ways. For example, the device / network equipment embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0118] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0119] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for correcting the remaining battery power, characterized in that: include: Acquiring a discharge voltage of a first single cell, a discharge current of the first single cell, and a remaining capacity of the first single cell; The first single cell is a single cell with the smallest voltage value in the battery pack; If the discharge voltage of the first single cell is less than the discharge cut-off voltage and the discharge current of the first single cell is less than a preset current, the open circuit voltage of the first single cell is determined according to the discharge voltage and polarization voltage of the first single cell; the polarization voltage is the difference between the open circuit voltage and the discharge voltage of the single cell; If the open circuit voltage of the first single cell is less than a preset open circuit voltage, the remaining power of the first single cell is corrected to zero; the preset open circuit voltage is the open circuit voltage corresponding to when the remaining power of the single cell in the battery pack is zero.

2. The method for correcting the remaining battery power according to claim 1, characterized in that: The step of determining the open circuit voltage of the first single cell according to the discharge voltage and polarization voltage of the first single cell comprises: The sum of the discharge voltage of the first single cell and the polarization voltage is calculated to obtain the open circuit voltage of the first single cell.

3. The method for correcting the remaining battery power according to claim 1, characterized in that: The battery remaining capacity correction method further includes: Acquire the current temperature of the first single battery; The discharge cut-off voltage is determined according to the current temperature.

4. The method for correcting the remaining battery power according to claim 1, characterized in that: If the open circuit voltage of the first single cell is less than a preset open circuit voltage, correcting the remaining power of the first single cell to zero includes: If the duration that the open circuit voltage of the first single battery cell is less than the preset open circuit voltage is greater than a first preset time, the remaining power of the first single battery cell is corrected to zero.

5. The method for correcting the remaining battery power according to claim 1, characterized in that: The battery remaining capacity correction method further includes: When the remaining power of the single battery is lower than the preset power, controlling the single battery to discharge, and obtaining the first voltage of the single battery at the end of the discharge; Controlling the single cell battery to enter a static state, and obtaining a second voltage of the single cell battery when the duration of the single cell battery being in the static state reaches a second preset time; The difference between the second voltage and the first voltage is calculated to obtain the polarization voltage.

6. The method for correcting the remaining battery power according to any one of claims 1 to 5, characterized in that: The battery remaining capacity correction method further includes: Acquiring the remaining power of a second single cell; the second single cell is the single cell with the largest remaining power in the battery pack; The remaining power of the second single cell is corrected based on the remaining power correction value of the first single cell to obtain the corrected remaining power of the second single cell; the remaining power correction value of the first single cell is the difference between the remaining power of the first single cell before correction and the remaining power of the first single cell after correction; The remaining power of the battery pack is determined based on the corrected remaining power of the first single cell and the corrected remaining power of the second single cell.

7. The method for correcting the remaining battery capacity according to claim 6, characterized in that: The step of correcting the remaining power of the second single cell based on the remaining power correction value of the first single cell to obtain the corrected remaining power of the second single cell includes: The remaining power of the second single cell is subtracted from the remaining power correction value of the first single cell to obtain the corrected remaining power of the second single cell.

8. A battery remaining power correction device, characterized in that: include: A first acquisition module, used for acquiring a discharge voltage of a first single cell, a discharge current of the first single cell, and a remaining power of the first single cell; The first single cell is a single cell with the smallest voltage value in the battery pack; an open circuit voltage determination module, configured to determine the open circuit voltage of the first single cell according to the discharge voltage and polarization voltage of the first single cell if the discharge voltage of the first single cell is less than the discharge cut-off voltage and the discharge current of the first single cell is less than a preset current; the polarization voltage is the difference between the open circuit voltage and the discharge voltage of the single cell; The first correction module is used to correct the remaining power of the first single cell to zero if the open circuit voltage of the first single cell is less than a preset open circuit voltage; the preset open circuit voltage is the open circuit voltage corresponding to when the remaining power of the single cell in the battery pack is zero.

9. A vehicle comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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