CN115840151A

CN115840151A - Battery capacity consistency analysis method and device and computer equipment

Info

Publication number: CN115840151A
Application number: CN202211108131.2A
Authority: CN
Inventors: 林文煜; 杜明树
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-03-24

Abstract

The present application relates to a method, an apparatus, a computer device, a storage medium and a computer program product for analyzing battery pack capacity consistency. The method comprises the following steps: acquiring first voltage signals of at least two battery cells of a battery pack at a charging starting moment and second voltage signals of at least two battery cells at a charging tail end moment; determining a first residual electric quantity difference value of the battery pack at the charging starting moment according to the first voltage signals of the at least two battery cells, and determining a second residual electric quantity difference value of the battery pack at the charging tail end moment according to the second voltage signals of the at least two battery cells; and analyzing the capacity consistency of the battery pack according to the first residual capacity difference value and the second residual capacity difference value. By adopting the method, the analysis operation of the consistency of the battery pack capacity can be simplified, and the reliability and the accuracy of the analysis can be ensured.

Description

Battery capacity consistency analysis method and device and computer equipment

Technical Field

The present application relates to the field of battery technologies, and in particular, to a method and an apparatus for analyzing battery capacity consistency, a computer device, a storage medium, and a computer program product.

Background

With the increasing environmental pollution and energy crisis, new energy power batteries gradually gain the market and are widely used. The power battery is used as an important energy storage element, for example, the power battery is used as an important energy storage element of an electric automobile, and the performance of the power battery is closely related to the normal operation and good operation of the automobile.

The power battery of the electric automobile has the process of repeated charging and discharging in the using process, and the process affects the inconsistency among the single battery cores of the battery. Inconsistency among the monomer electric cores directly influences the service performance and safety of the battery, and potential safety hazards exist in running of the electric automobile due to the inconsistency. Therefore, the capacity consistency of the power battery needs to be evaluated to identify the problem of the battery capacity consistency.

However, at present, for identifying the consistency of battery capacity, the electrochemical alternating current impedance spectrum of each battery is tested through experimental equipment, fingerprint identification is performed on the electrochemical alternating current impedance spectrum, the consistency of the battery capacity of a specific scene can only be analyzed according to experimental settings, multi-dimensional analysis data is generated, and analysis of the consistency of the battery capacity is complex.

Disclosure of Invention

In view of the above, it is necessary to provide a method, an apparatus, a computer device, a computer readable storage medium, and a computer program product for analyzing battery capacity consistency, which can solve the problem of complicated analysis of battery capacity consistency.

In a first aspect, the present application provides a method for analyzing battery capacity consistency. The method comprises the following steps:

acquiring first voltage signals of at least two battery cells of a battery pack at a charging starting moment and second voltage signals of at least two battery cells at a charging tail end moment;

determining a first residual capacity difference value of the battery pack at the charging starting moment according to the first voltage signals of the at least two battery cells, and determining a second residual capacity difference value of the battery pack at the charging tail end moment according to the second voltage signals of the at least two battery cells;

and analyzing the capacity consistency of the battery pack according to the first residual capacity difference value and the second residual capacity difference value.

In the above embodiment, when the battery capacity consistency is analyzed, the voltage signals of at least two battery cells at the charging start time and the charging end time of the battery pack in the charging stage are obtained, the remaining power difference value of the battery pack at the charging start time and the charging end time is determined according to the obtained voltage signals of the at least two battery cells, the capacity consistency of the battery pack in the charging process is analyzed according to the remaining power difference value of the battery pack at the charging start time and the charging end time, the charging data of the battery pack in each charging time stage does not need to be analyzed, the data processing amount is reduced, the processing steps of the battery capacity consistency analysis are simplified, the performance of the battery pack can be accurately reflected according to the remaining power difference value, and the accuracy and the reliability of the capacity consistency analysis result are ensured.

In one embodiment, the first voltage signals of the at least two battery cells at the charging start time include: a first maximum voltage signal of a battery cell with the maximum charging voltage at the charging starting moment and a first minimum voltage signal with the minimum charging voltage; the second voltage signals of the at least two battery cells at the charging end time include: a second maximum voltage signal of the battery cell with the maximum charging voltage and a second minimum voltage signal with the minimum charging voltage at the charging terminal moment;

determining a first remaining power difference value of the battery pack at the charging start time according to the first voltage signals of the at least two battery cells, and determining a second remaining power difference value of the battery pack at the charging end time according to the second voltage signals of the at least two battery cells, including:

determining a first residual capacity difference value of the battery pack at the charging starting moment according to a first maximum voltage signal of the battery cell with the maximum charging voltage and a first minimum voltage signal with the minimum charging voltage at the charging starting moment;

and determining a second remaining capacity difference value of the battery pack at the charging terminal moment according to the second maximum voltage signal of the battery cell with the maximum charging voltage and the second minimum voltage signal of the battery cell with the minimum charging voltage at the charging terminal moment.

In the above embodiment, according to the maximum voltage signal of the electric core with the maximum charging voltage and the minimum voltage signal of the minimum charging voltage corresponding to the charging start time and the charging end time, the remaining power difference value at the corresponding time is respectively determined, the charging data at other times does not need to be acquired, and the data processing amount is reduced.

In one embodiment, the determining, according to a first maximum voltage signal of a battery cell with a maximum charging voltage at the charging start time and a first minimum voltage signal with a minimum charging voltage, a first remaining capacity difference value of the battery pack at the charging start time includes:

respectively determining a first residual capacity corresponding to the first maximum voltage signal and a second residual capacity corresponding to the first minimum voltage signal according to the conversion relation between the cell voltage and the residual capacity;

and determining a first residual capacity difference value of the battery pack at the charging starting moment according to the difference value of the first residual capacity and the second residual capacity.

In the above embodiment, the remaining power corresponding to the maximum voltage signal and the minimum voltage signal at the charge start time is determined according to the conversion relationship between the voltage and the remaining power, and the capacity of the battery at the charge start time and the charge end time can be accurately determined according to the remaining power.

In one embodiment, the determining, according to the second maximum voltage signal of the battery cell with the maximum charging voltage and the second minimum voltage signal with the minimum charging voltage at the charging end time, a second remaining capacity difference value of the battery pack at the charging end time includes:

respectively determining a third residual capacity corresponding to the second maximum voltage signal and a fourth residual capacity corresponding to the second minimum voltage signal according to the conversion relation between the cell voltage and the residual capacity;

and determining a second remaining capacity difference value of the battery pack at the charging terminal moment according to the difference value of the third remaining capacity and the fourth remaining capacity.

In the above embodiment, the maximum voltage signal and the remaining power corresponding to the minimum voltage signal at the charging end time are determined according to the conversion relationship between the voltage and the remaining power, and the capacity condition of the battery at the charging end time can be accurately determined according to the remaining power.

In one embodiment, the analyzing the capacity consistency of the battery pack according to the first remaining capacity difference value and the second remaining capacity difference value includes:

and if the first residual electric quantity difference value is smaller than an electric quantity difference threshold value and the second residual electric quantity difference value is smaller than the electric quantity difference threshold value, determining that the electric core capacities of the battery packs are consistent.

In the above embodiment, the cell capacities of the battery packs are accurately determined to be consistent by comparing the remaining capacity difference value at the charging start time of the battery pack and the remaining capacity at the charging end time of the battery pack to be smaller than the capacity difference threshold.

if the first remaining electric quantity difference value is smaller than an electric quantity difference threshold value and the second remaining electric quantity difference value is larger than or equal to the electric quantity difference threshold value, determining that the battery core capacities of the battery packs are inconsistent;

and if the first remaining capacity difference value is greater than or equal to the capacity difference threshold value and the second remaining capacity difference value is smaller than the capacity difference threshold value, determining that the battery cell capacities of the battery packs are inconsistent.

In the above embodiment, it is accurately determined that the battery capacities are inconsistent due to differences between some of the battery cells by determining that the remaining power difference value at the charge start time or the charge end time is greater than or equal to the power difference threshold.

and if the first remaining power difference value is greater than a power difference threshold value and the second remaining power difference value is greater than the power difference threshold value, determining that the battery pack is under balanced.

In the above embodiment, the inconsistency of the battery capacities due to the insufficient balancing of the battery packs is accurately determined by the difference value of the remaining electric quantities between the charging start time and the charging end time being greater than the electric quantity difference threshold value.

In one embodiment, the method further comprises:

and when the battery cell capacities of the battery packs are consistent and the capacities of the battery packs are insufficient, generating prompt information for replacing the battery packs.

In the embodiment, when the cell capacities of the battery packs are consistent, the battery packs are replaced, so that the use safety is improved.

In one embodiment, the method further comprises:

when the cell capacity of the battery pack is determined to be inconsistent and the capacity of the battery pack is insufficient, acquiring an electrical box number of a cell in the battery pack, which corresponds to the first maximum voltage signal or the second maximum voltage signal;

and generating prompt information for replacing the electronic box corresponding to the electronic box number.

In the above embodiment, when it is determined that the cell capacities of the battery packs are inconsistent, the electric box to which the attenuated cell belongs is determined, and the electric box with the low capacity is replaced, so that the safety and the service life of the battery pack are improved.

In one embodiment, the method further comprises:

and when the capacity of the battery pack is insufficient and the battery pack is in insufficient balance, generating prompt information for updating balance control of the battery pack.

In the above embodiment, when the capacity of the battery pack is insufficient and the battery pack is in insufficient balance, the balance control of the battery pack is updated to ensure the capacity of the battery pack and improve the utilization rate of resources.

In one embodiment, before the obtaining of the first voltage signals of the at least two cells of the battery pack at the charging start time and the second voltage signals of the at least two cells at the charging end time, the method further includes:

acquiring charging condition data of the battery pack; the charging condition data comprises the residual electric quantity and the end voltage of the battery pack;

and if the residual electric quantity is within a preset electric quantity variation range and the ending voltage is greater than a preset voltage, executing the step of acquiring first voltage signals of at least two electric cores of the battery pack at the charging starting moment and second voltage signals of at least two electric cores of the battery pack at the charging tail end moment.

In the above embodiment, the charging sections meeting the requirements are screened out according to the preset electric quantity variation range and the preset voltage, so as to further ensure the reliability and accuracy of the battery capacity consistency analysis.

In a second aspect, the present application further provides an apparatus for analyzing battery capacity uniformity. The device comprises:

the signal acquisition module is used for acquiring first voltage signals of at least two battery cells of the battery pack at the charging starting moment and second voltage signals of at least two battery cells at the charging tail end moment;

the electric quantity difference determining module is used for determining a first residual electric quantity difference value of the battery pack at the charging start moment according to the first voltage signals of the at least two battery cells, and determining a second residual electric quantity difference value of the battery pack at the charging end moment according to the second voltage signals of the at least two battery cells;

and the consistency analysis module is used for analyzing the capacity consistency of the battery pack according to the first residual electric quantity difference value and the second residual electric quantity difference value.

In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor implementing the following steps when executing the computer program:

In a fourth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:

In a fifth aspect, the present application further provides a computer program product. The computer program product comprising a computer program which when executed by a processor performs the steps of:

determining a first residual capacity difference value of the battery pack at the charging start moment according to the first voltage signals of the at least two battery cells, and determining a second residual capacity difference value of the battery pack at the charging end moment according to the second voltage signals of the at least two battery cells;

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

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

FIG. 1 is a diagram illustrating an exemplary embodiment of a method for analyzing consistency of battery capacity;

FIG. 2 is a schematic flow chart diagram illustrating a method for analyzing consistency of battery capacity in one embodiment;

fig. 3 is a charge profile of cells of a battery pack during a charging phase in one embodiment;

FIG. 4 is a flowchart illustrating a method for determining a remaining power difference value according to an embodiment;

fig. 5 is a graph corresponding to a conversion relationship between a cell voltage and a remaining power in one embodiment;

FIG. 6 is a schematic flow chart illustrating the steps of analyzing the consistency of battery pack capacity in one embodiment;

FIG. 7 is a schematic diagram illustrating the same degree of overall capacity fade of a battery pack in one embodiment;

FIG. 8 is a schematic diagram of the presence of a single cell fade in a battery pack in one embodiment;

FIG. 9 is a schematic diagram of an embodiment of a battery pack under equalization;

FIG. 10 is a schematic flow chart showing a method for analyzing consistency of battery capacities in another embodiment;

FIG. 11 is a block diagram showing the structure of an apparatus for analyzing consistency of battery capacities according to an embodiment;

FIG. 12 is a diagram illustrating an internal structure of a computer device according to an embodiment.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing the association object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two sets), "plural pieces" refers to two or more (including two pieces).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

With the development of new energy technology, new energy power batteries gradually gain the market and are widely used. The power battery is used as an important energy storage element, and the capacity is one of important performance indexes of the power battery. The power battery has the process of repeated charge and discharge alternation in the using process, and the capacity of each battery cell in the same battery pack is kept consistent within an allowable error range when the battery pack leaves a factory. With the increase of the service time of the battery pack and the influence of external factors, the battery cells in the battery pack are influenced to a certain degree, and the capacity of the battery cells in the battery pack is inconsistent. The inconsistent battery capacities in the battery pack affect the service life of the battery pack and have potential safety hazards, so the consistency of the battery pack capacities needs to be analyzed.

At present, when analyzing the consistency of the capacity of a battery pack, the existing method identifies a multidimensional EIS curve cluster of a battery to be evaluated by using a fingerprint identification algorithm, and determines the SOH (state-of-health) and SOC (state of charge), also called residual capacity) states of the battery to be evaluated; and dividing the batteries with the SOH consistency into a group, and performing further evaluation on the consistency in the batteries in the group by using the similarity between the maps. However, based on the method, only the consistency of the battery pack capacity under a specific scene can be analyzed, and specific hardware equipment is required to determine the multidimensional EIS curve cluster, so that the data analysis process is complicated.

Therefore, a method capable of solving the problem of complicated analysis of the consistency of the battery capacity is proposed, in which a first voltage signal of at least two cells of a battery pack at a charging start time and a second voltage signal of at least two cells at a charging end time are acquired; determining a first residual electric quantity difference value of the battery pack at the charging starting moment according to the first voltage signals of the at least two battery cells, and determining a second residual electric quantity difference value of the battery pack at the charging tail end moment according to the second voltage signals of the at least two battery cells; and analyzing the capacity consistency of the battery pack according to the first residual capacity difference value and the second residual capacity difference value.

The method comprises the steps of obtaining voltage signals of at least two battery cells at the charging starting time and the charging ending time of the battery pack in the charging stage, determining the residual electric quantity difference value of the battery pack at the charging starting time and the charging ending time according to the obtained voltage signals of the at least two battery cells, analyzing the capacity consistency of the battery pack in any scene according to the residual electric quantity difference value of the charging starting time and the charging ending time, not analyzing the charging data of the battery pack in each charging time stage, reducing the data processing amount, simplifying the processing steps of the battery capacity consistency, accurately reflecting the performance of the battery pack according to the residual electric quantity difference value, and ensuring the accuracy and the reliability of the capacity consistency analysis result.

It is to be understood that the battery pack of the present application may be used in, but not limited to, an electrical device for a vehicle, a ship, an aircraft, or the like. As shown in fig. 1, which is an application environment diagram of an analysis method for battery capacity consistency, a battery pack is applied to an electric vehicle 102, the electric vehicle uploads acquired charging data to a cloud server 104, and the cloud server acquires, from the charging data, first voltage signals of at least two battery cells of the battery pack at a charging start time and second voltage signals of at least two battery cells at a charging end time; determining a first residual electric quantity difference value of the battery pack at the charging starting moment according to the first voltage signals of the at least two battery cells, and determining a second residual electric quantity difference value of the battery pack at the charging tail end moment according to the second voltage signals of the at least two battery cells; and analyzing the capacity consistency of the battery pack according to the first residual capacity difference value and the second residual capacity difference value.

In one embodiment, as shown in fig. 2, a method for analyzing battery capacity consistency is provided, which is described by taking the method as an example applied to the cloud in fig. 1, and includes the following steps:

step 202, obtaining first voltage signals of at least two battery cells of the battery pack at a charging start time and second voltage signals of at least two battery cells at a charging end time.

The battery pack can comprise parallel electric boxes, and each electric box comprises a plurality of electric cores connected in series. The battery pack has charging and discharging processes in the using process, the battery pack has insufficient capacity, and the capacity consistency of the battery pack needs to be analyzed to effectively identify the capacity consistency of the battery pack. The insufficient capacity can be understood as that the battery pack fails to reach the preset operation capacity in the case of being full. According to different application scenarios, the preset working capacity is a preset working duration, and can also be a preset driving mileage, etc.

The charging start time can be understood as a time point when the battery pack is powered on under the condition of normal charging, and the charging end time can be understood as a time point when the battery pack is powered off under the condition of normal charging, and can also be understood as a time point when the battery pack is fully charged. As shown in fig. 3, a charging curve (cell voltage-charging current) of the battery cell in the charging phase varies with the charging time, and the charging voltage and the charging current between the charging start time and the charging end time of the battery cell 1 and the battery cell 2 also vary. The at least two battery cells at the charging starting moment comprise two battery cells with the maximum charging voltage and the minimum charging voltage at the charging starting moment, and the at least two battery cells at the charging tail end moment comprise two battery cells with the maximum charging voltage and the minimum charging voltage at the charging tail end. At least two battery cells at the initial charging moment and at least two battery cells at the end of charging moment can be completely the same battery cells, completely different battery cells or partially the same battery cells.

The voltage signal refers to a signal of a battery cell of the battery pack in a charging state, and the "first" and the "second" are used only for distinguishing the voltage signals of the battery cells at different moments. The acquired voltage signal is determined according to the acquired original battery data, wherein the original battery signal data comprises a voltage signal of a battery cell in the battery pack, a current signal of the battery cell, a battery cell position identifier, a charging zone bit, a discharging zone bit and the like, the voltage signal and the current signal in the charging period have corresponding charging zone bits, and the voltage signal and the current signal in the discharging period have corresponding discharging zone bits. The cell location identifier may be an electrical box to which the cell belongs and a location in the electrical box.

Specifically, the cloud acquires original battery data of the battery pack, preprocesses the original battery data to obtain voltage signals corresponding to the charging flag bits from the preprocessed original battery data, and determines voltage signals of at least two battery cells at the charging starting moment and voltage signals of at least two battery cells at the charging tail end moment from the voltage signals according to the residual electric quantity of the battery pack. The preprocessing comprises modifying or clearing data such as original battery data which are null values, illegal formats (such as messy codes), default values, value range intervals which exceed attributes, repeated time sequence data and the like. For example, taking an example that a battery pack is applied to a power electric vehicle, the power electric vehicle may have a state of signal interference or poor signal in a driving process, the battery pack is in a discharging state in the driving process of the power electric vehicle, original battery data acquired by a vehicle end may be lost or cannot be reported to a cloud, and thus, the original battery data received by the cloud may have a messy code or may be empty.

Step 204, determining a first remaining power difference value of the battery pack at the charging start time according to the first voltage signals of the at least two battery cells, and determining a second remaining power difference value of the battery pack at the charging end time according to the second voltage signals of the at least two battery cells.

It can be understood that the voltage variation of the battery cell during the charging process of the battery pack is nonlinear, and the consistency of the battery pack capacity cannot be accurately and qualitatively analyzed according to the voltage signal of the nonlinear variation. A corresponding conversion relationship exists between the cell voltage and the remaining power, and the conversion relationship between the cell voltage and the remaining power can be determined by the existing conversion mode of the voltage and the remaining power, which is not described herein again.

Specifically, the charging voltages of the at least two battery cells at the charging start time are determined according to the first voltage signals of the at least two battery cells, the remaining power amounts corresponding to the at least two battery cells are determined according to the corresponding conversion relationship between the battery cell voltages and the remaining power amounts, and the remaining power difference value of the battery at the charging start time, that is, the first remaining power difference value, is obtained according to the difference value of the remaining power amounts corresponding to the at least two battery cells. Determining voltages of the at least two battery cells at the charging terminal moment according to the second voltage signals of the at least two battery cells, determining residual electric quantities corresponding to the at least two battery cells according to a corresponding conversion relation between the voltages of the battery cells and the residual electric quantities, and obtaining a residual electric quantity difference value of the battery at the charging terminal moment, namely a second residual electric quantity difference value, according to a difference value of the residual electric quantities corresponding to the at least two battery cells.

And step 206, analyzing the capacity consistency of the battery pack according to the first remaining capacity difference value and the second remaining capacity difference value.

Specifically, consistency analysis is performed on the capacity of the battery pack according to the residual capacity difference value at the charging start time and the residual capacity difference value at the charging end time, so as to obtain a pre-configured electric quantity difference threshold, wherein the electric quantity difference threshold is used for detecting whether the capacity of the battery cells of the battery pack can be simultaneously full of electricity within a set time. According to the magnitude relation between the first residual electric quantity difference value and the electric quantity difference threshold value and the magnitude relation between the second residual electric quantity difference value and the electric quantity difference threshold value, the capacity consistency of the battery pack can be determined for analysis.

Further, at the charging start time, if the first remaining power difference value is smaller than the power difference threshold, it is indicated that the electric cores of the battery pack are substantially consistent at the charging start time, and in order to further detect the battery pack capacity consistency, it is determined whether the second remaining power difference value at the charging end time of the battery pack is smaller than the power difference threshold, and if the second remaining power difference value is smaller than the power difference threshold, it is indicated that the electric cores of the battery pack are substantially consistent at the charging end time, and the battery pack capacity consistency is good. If the difference is larger than or equal to the electric quantity difference threshold, it indicates that the capacities of the electric cells of the battery pack at the charging end moment are different greatly, and the consistency of the capacities of the battery pack is poor. In order to ensure the accuracy and reliability of the capacity consistency of the battery pack, the capacity consistency of the battery pack is analyzed according to the residual electric quantity, and meanwhile, along with the application and popularization of the power battery, the capacity consistency of the battery pack under different scenes can be analyzed in order to ensure that the residual electric quantity difference value at the charging starting moment and the residual electric quantity difference value at the charging tail end moment are determined, so that the capacity consistency of the battery pack is analyzed.

When a first remaining power difference value of the battery pack at a charging start time is determined according to first voltage signals of at least two battery cells, a second remaining power difference value of the battery pack at a charging end time is determined according to second voltage signals of at least two battery cells, the first remaining power difference value at the charging start time can be determined according to a first maximum voltage signal of a battery cell with the maximum charging voltage at the charging start time and a first minimum voltage signal with the minimum charging voltage, and the second remaining power difference value of the battery pack at the charging end time can be determined according to a second maximum voltage signal of a battery cell with the maximum charging voltage at the charging end time and a second minimum voltage signal with the minimum charging voltage. As shown in fig. 4, a method for determining a remaining power difference value is provided, which is described by taking the application of the method to the cloud in fig. 1 as an example, and includes the following steps:

step 402, determining a first remaining power difference value of the battery pack at the charging start time according to a first maximum voltage signal of a battery cell with the maximum charging voltage and a first minimum voltage signal of a battery cell with the minimum charging voltage at the charging start time.

At least two first maximum voltage signals of the battery cell with the maximum charging voltage at the charging starting moment may exist at the same time, at least two first minimum voltage signals with the minimum charging voltage may exist at the same time, one of the battery cells with the maximum charging voltage may be selected at will and the position of the battery cell corresponding to the battery cell may be determined, and one of the battery cells with the minimum charging voltage may be selected at will and the position of the battery cell corresponding to the battery cell may be determined. Determining the corresponding residual capacity according to the first maximum voltage signal of the battery cell with the maximum charging voltage, determining the corresponding residual capacity according to the first minimum voltage signal of the battery cell with the minimum charging voltage, determining the difference value of the corresponding residual capacity according to the first maximum voltage signal and the first minimum voltage signal, and determining the first residual capacity difference value of the battery pack at the charging starting moment.

Step 404, determining a second remaining capacity difference value of the battery pack at the charging end moment according to the second maximum voltage signal of the battery cell with the maximum charging voltage and the second minimum voltage signal with the minimum charging voltage at the charging end moment.

At least two second maximum voltage signals of the battery cell with the maximum charging voltage at the charging terminal may exist at the same time, at least two second minimum voltage signals with the minimum charging voltage may exist at the same time, one of the battery cells with the maximum charging voltage may be selected at will and the position of the battery cell corresponding to the battery cell may be determined, and one of the battery cells with the minimum charging voltage may be selected at will and the position of the battery cell corresponding to the battery cell may be determined. Determining the corresponding residual capacity according to the second maximum voltage signal of the battery cell with the maximum charging voltage, determining the corresponding residual capacity according to the second minimum voltage signal of the battery cell with the minimum charging voltage, determining the difference value of the corresponding residual capacity and the second minimum voltage signal according to the second maximum voltage signal, and determining the second residual capacity difference value of the battery pack at the charging end moment.

In one embodiment, according to a conversion relationship between the cell voltage and the remaining power, a first remaining power corresponding to the first maximum voltage signal and a second remaining power corresponding to the first minimum voltage signal are respectively determined; and determining a first residual capacity difference value of the battery pack at the charging starting moment according to the difference value of the first residual capacity and the second residual capacity. Respectively determining a third residual capacity corresponding to the second maximum voltage signal and a fourth residual capacity corresponding to the second minimum voltage signal according to the conversion relation between the cell voltage and the residual capacity; and determining a second remaining capacity difference value of the battery pack at the charging terminal moment according to the difference value of the third remaining capacity and the fourth remaining capacity. The conversion relationship between the cell voltage and the remaining power is shown in fig. 5, and the remaining power corresponding to different voltages can be determined according to a curve corresponding to the conversion relationship between the cell voltage and the remaining power. For example, according to the first maximum voltage signal Vs _ max, the first minimum voltage signal Vs _ min, the second maximum voltage signal Vp _ max, and the second minimum voltage signal Vp _ min, the first remaining power amount SOCs _ max, the second remaining power amount SOCs _ min, the third remaining power amount SOCp _ max, and the fourth remaining power amount SOCp _ min are obtained by looking up the curve shown in fig. 5, and the first remaining power amount difference value delta _ soc _ init at the charge start time and the second remaining power amount difference value delta _ soc _ peak at the charge end time are calculated.

The method comprises the steps of determining the residual capacity corresponding to the maximum voltage signal and the minimum voltage signal at the charging start time and the charging end time according to the conversion relation between the voltage and the residual capacity, accurately determining the capacity conditions of the battery at the charging start time and the charging end time according to the residual capacity, and reducing the data processing amount without acquiring the charging data at other times.

After a first residual capacity difference value of the battery pack at the charging starting moment and a second residual capacity difference value of the battery pack at the charging tail end moment are obtained, the consistency of the capacity of the battery pack is analyzed, and meanwhile specific analysis of consistency and inconsistency of the capacity of the battery pack can be accurately determined according to the state of the battery pack.

In one embodiment, as shown in fig. 6, the steps for analyzing the consistency of the battery capacity in one embodiment include the following:

step 602, obtaining a power difference threshold of the battery pack.

In step 604, it is determined whether the first remaining power difference is smaller than a power difference threshold and whether the second remaining power difference is smaller than a power difference threshold.

Step 606, if the first remaining power difference value is smaller than the power difference threshold value and the second remaining power difference value is smaller than the power difference threshold value, it is determined that the cell capacities of the battery packs are consistent.

Specifically, if the first remaining capacity difference value at the charging start time of the battery pack is smaller than the capacity difference threshold, and the second remaining capacity difference value at the charging end time of the battery pack is smaller than the capacity difference threshold, it indicates that the capacities of the battery cells of the battery pack are consistent within the allowable deviation range of the capacities, that is, the capacities of the battery cells of the battery pack are the same. Further, if the battery pack is a battery with insufficient capacity, it indicates that the overall capacity attenuation degree of the battery pack is the same, as shown in fig. 7, which is a schematic diagram of the same overall capacity attenuation degree of the battery pack, and the quality guarantee capacity can be understood as the capacity that the battery cell can reach after being used for a period of time.

Step 608, if the first remaining power difference is smaller than the power difference threshold and the second remaining power difference is greater than or equal to the power difference threshold, determining that the battery cell capacities of the battery packs are inconsistent.

Specifically, if the first remaining power difference value at the charging start time of the battery pack is smaller than the power difference threshold value and the second remaining power difference value at the charging end time of the battery pack is greater than or equal to the power difference threshold value, it indicates that the capacities of the battery cells of the battery pack are inconsistent. Further, if the battery pack is a battery with insufficient capacity, if the first remaining capacity difference is smaller than the capacity difference threshold and the second remaining capacity difference is greater than or equal to the capacity difference threshold, it is represented that a single cell attenuation exists in the battery pack. As shown in fig. 8, a diagram illustrating the presence of single cell attenuation in a battery pack is shown.

For example, the maximum charge voltage of the battery pack at the charge start time is cell 1, the minimum charge voltage is cell 2, and the difference between the remaining electric quantities of cell 1 and cell 2 is smaller than the electric quantity difference threshold. The maximum charging voltage of the battery pack at the charging end is the battery cell 1, the minimum charging voltage is the battery cell 3, the residual electric quantity of the battery cell 2 is subtracted from the residual electric quantity of the battery cell 1, and the obtained difference value is larger than or equal to the electric quantity difference threshold value, so that the battery cell 1 is proved to have abnormal attenuation.

For another example, the maximum charging voltage of the battery pack at the charging start time is cell 1, the minimum charging voltage is cell 2, and the difference between the remaining electric quantities of cell 1 and cell 2 is smaller than the electric quantity difference threshold. The maximum charging voltage of the battery pack at the charging end is the battery cell 3, the minimum charging voltage is the battery cell 4, the residual electric quantity of the battery cell 4 is subtracted from the residual electric quantity of the battery cell 3, and the obtained difference value is larger than or equal to the electric quantity difference threshold value, which indicates that the battery cell 3 has abnormal attenuation.

Step 610, if the first remaining power difference is greater than or equal to the power difference threshold, and the second remaining power difference is smaller than the power difference threshold, it is determined that the cell capacities of the battery packs are inconsistent.

Specifically, if the first remaining power difference is greater than or equal to the power difference threshold and the second remaining power difference is less than the power difference threshold, it indicates that the capacities of the battery cells of the battery pack are inconsistent. Further, if the first remaining power difference is greater than or equal to the power difference threshold and the second remaining power difference is smaller than the power difference threshold, it is represented that a single cell attenuation exists in the battery pack.

For example, the maximum charging voltage of the battery pack at the charging start time is the battery cell 5, the minimum charging voltage is the battery cell 6, and the difference value obtained by subtracting the residual capacity of the battery cell 6 from the residual capacity of the battery cell 5 is greater than or equal to the capacity difference threshold value. The maximum charging voltage of the battery pack at the charging end is the battery cell 5, the minimum charging voltage is the battery cell 6, the residual electric quantity of the battery cell 6 is subtracted from the residual electric quantity of the battery cell 5, and the obtained difference value is smaller than the electric quantity difference threshold, which indicates that the attenuation abnormality exists in the battery cell 6.

For another example, the maximum charging voltage of the battery pack at the charging start time is battery cell 5, the minimum charging voltage is battery cell 6, and a difference obtained by subtracting the remaining power of battery cell 6 from the remaining power of battery cell 5 is greater than or equal to the power difference threshold. The maximum charging voltage of the battery pack at the charging end is the battery cell 7, the minimum charging voltage is the battery cell 8, the residual electric quantity of the battery cell 8 is subtracted from the residual electric quantity of the battery cell 7, and the obtained difference value is smaller than the electric quantity difference threshold value, which indicates that the attenuation abnormality exists in the battery cell 5.

In step 612, if the first remaining power difference is greater than the power difference threshold and the second remaining power difference is greater than the power difference threshold, it represents that the battery pack is under balanced.

The insufficient balance of the battery pack can be caused by the internal structure of the battery cells in the battery pack, the self-discharge of the battery cells of the battery pack and the inconsistency of the self-discharge rates of the battery cells.

Specifically, if the capacity of the battery pack is insufficient, the first remaining power difference value is greater than the power difference threshold, and the second remaining power difference value is greater than the power difference threshold, the balance of the battery pack is represented to be insufficient. As shown in fig. 9, which is a schematic diagram of the battery pack with insufficient balancing, the discharge times of the cells of the battery pack are not uniform.

In the above embodiment, the consistency of the battery pack capacity is accurately analyzed according to the magnitude relationship between the first remaining power difference value at the charging start time and the power difference threshold value, and the magnitude relationship between the second remaining power difference value at the charging end time and the power difference threshold value, so as to obtain the analysis results of the consistency and inconsistency of the capacity.

When it is determined that the capacities of the battery packs are equal, if the capacities of the battery packs are insufficient, the battery packs need to be replaced.

In one embodiment, when the cell capacities of the battery packs are consistent and the capacities of the battery packs are insufficient, prompt information for replacing the battery packs is generated. When the capacity fading degree of the entire battery pack is the same, the battery pack is replaced to secure the battery capacity. For example, the battery pack of the electric vehicle has insufficient capacity and the capacity of the entire battery pack is attenuated to the same extent, and the running safety and the service life of the electric vehicle can be ensured by replacing the battery pack.

When the capacity of the battery pack is determined to be inconsistent, if the capacity of the battery pack is insufficient, the electrical box corresponding to the electrical core needs to be replaced. In one embodiment, when the capacity of the whole battery cells of the battery pack is inconsistent and the capacity of the battery pack is insufficient, the battery box number of the battery cell in the battery pack corresponding to the first maximum voltage signal or the second maximum voltage signal is acquired; and generating prompt information of the electronic box corresponding to the electronic box number. And the capacity of the battery pack is ensured by determining the electric box to which the attenuated battery cell belongs and replacing the electric box with low capacity. And if the integral cell capacities of the battery pack are inconsistent, the attenuation of partial cell capacities of the battery pack is abnormal. For example, in an electric vehicle, if a single cell in a battery pack is attenuated, an electric box corresponding to the attenuated cell is replaced, so that the driving safety of the electric vehicle is ensured, and the service life of the electric vehicle is prolonged.

In one embodiment, when the capacity of the battery pack is insufficient and the cell capacity of the battery pack is not balanced enough, prompt information for updating balance control of the battery pack is generated. When the balance of the battery pack is insufficient, the balance control of the battery pack is updated, so that the capacity of the battery pack is ensured, and the utilization rate of resources is improved.

In another embodiment, as shown in fig. 10, a method for analyzing battery capacity consistency is provided, which is described by taking the method as an example applied to the cloud in fig. 1, and includes the following steps:

step 1002, acquiring charging condition data of a battery pack; the charging condition data includes the remaining capacity and the end voltage of the battery pack.

The end voltage may be a voltage at which charging of the battery pack ends.

Step 1004, if the remaining power is within the preset power variation range and the ending voltage is greater than the preset voltage, acquiring first voltage signals of at least two battery cells of the battery pack with insufficient capacity at the charging starting moment and second voltage signals of at least two battery cells at the charging terminal moment.

Wherein the preset electric quantity variation range may be less than 25%. The predetermined voltage may be 3.4V, which is understood to be the plateau region of the battery pack.

The battery pack has repeated charging and discharging processes in the using process, when the battery pack is charged, the residual electric quantity of each time is not used up or is lower than the preset residual electric quantity, the battery pack is charged under the condition that the residual electric quantity is more according to the characteristics of the battery, the voltage change of the battery pack is not large, the corresponding residual electric quantity difference value is not large, and the consistency of the capacity of the battery pack cannot be accurately analyzed.

The first voltage signals of the at least two battery cells at the charging starting moment comprise a first maximum voltage signal of a battery cell with the maximum charging voltage and a first minimum voltage signal with the minimum charging voltage at the charging starting moment; the second voltage signals of the at least two cells at the charging end time include a second maximum voltage signal of the cell having the largest charging voltage and a second minimum voltage signal having the smallest charging voltage at the charging end time.

Step 1006, determining a first remaining power difference value of the battery pack at the charging start time according to the first maximum voltage signal of the battery cell with the maximum charging voltage and the first minimum voltage signal with the minimum charging voltage at the charging start time.

Step 1008, determining a second remaining capacity difference value of the battery pack at the charging end moment according to the second maximum voltage signal of the battery cell with the maximum charging voltage and the second minimum voltage signal with the minimum charging voltage at the charging end moment.

Step 1010, acquiring a power difference threshold of the battery pack.

In step 1012, if the first remaining power difference is smaller than the power difference threshold and the second remaining power difference is smaller than the power difference threshold, it is determined that the cell capacities of the battery packs are consistent.

And 1014, if the battery cell capacities of the battery packs are consistent and the capacities of the battery packs are insufficient, generating prompt information for replacing the battery packs.

In step 1016, if the first remaining power difference is smaller than the power difference threshold and the second remaining power difference is greater than or equal to the power difference threshold, it is determined that the cell capacities of the battery packs are inconsistent.

Step 1018, if the first remaining power difference is greater than or equal to the power difference threshold and the second remaining power difference is smaller than the power difference threshold, determining that the cell capacities of the battery packs are inconsistent.

Step 1020, if the capacities of the battery cells of the battery pack are not consistent and the capacity of the battery pack is insufficient, acquiring an electrical box number of the battery cell in the battery pack, which corresponds to the first maximum voltage signal or the second maximum voltage signal.

And step 1022, generating prompt information of the electric box corresponding to the electric box number to be replaced.

Step 1024, if the first remaining power difference value is greater than the power difference threshold and the second remaining power difference value is greater than the power difference threshold, it is determined that the battery pack is in insufficient balance.

In step 1026, if the capacity of the battery pack is insufficient and the battery pack is in insufficient balance, prompt information for updating the balance control of the battery pack is generated.

According to the method for analyzing the battery capacity consistency, a charging stage meeting the requirements is screened out according to the preset electric quantity variation range and the preset voltage, the capacity consistency of the battery pack in the charging process is analyzed according to the residual electric quantity difference value at the charging starting time and the charging ending time, the reasons of insufficient capacity are classified, and the corresponding maintenance mode is determined. The charging data of the battery pack at each charging time stage does not need to be analyzed, the data processing amount is reduced, the processing steps of battery capacity consistency are simplified, the performance of the battery pack can be accurately reflected according to the difference value of the residual electric quantity, the accuracy and the reliability of the analysis result of the capacity consistency are ensured, the battery pack is maintained according to the determined maintenance mode, and the safety and the service life of the battery pack are ensured.

It should be understood that, although the steps in the flowcharts related to the embodiments described above are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not limited to being performed in the exact order illustrated and, unless explicitly stated herein, may be performed in other orders. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.

Based on the same inventive concept, the embodiment of the present application further provides a battery pack capacity consistency analysis device for implementing the above-mentioned battery pack capacity consistency analysis method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the method, so specific limitations in one or more embodiments of the device for analyzing the battery pack capacity consistency provided below can be referred to the limitations in the above method for analyzing the battery pack capacity consistency, and are not described herein again.

In one embodiment, as shown in fig. 11, there is provided an analysis apparatus for battery pack capacity uniformity, including: a signal acquisition module 1102, a power difference determination module 1104, and a consistency analysis module 1106, wherein:

the signal acquiring module 1102 is configured to acquire first voltage signals of at least two battery cells of the battery pack at a charging start time and second voltage signals of at least two battery cells at a charging end time;

the electric quantity difference determining module 1104 is configured to determine a first remaining electric quantity difference value of the battery pack at a charging start time according to the first voltage signals of the at least two battery cells, and determine a second remaining electric quantity difference value of the battery pack at a charging end time according to the second voltage signals of the at least two battery cells;

a consistency analysis module 1106, configured to analyze the consistency of the capacity of the battery pack according to the first remaining power difference value and the second remaining power difference value.

In the above embodiment, the voltage signals of the at least two battery cells at the charging start time and the charging end time of the battery pack in the charging stage are obtained, the remaining power difference value of the battery pack at the charging start time and the charging end time is determined according to the obtained voltage signals of the at least two battery cells, the capacity consistency of the battery pack in the charging process is analyzed according to the remaining power difference value of the charging start time and the charging end time, the charging data of the battery pack in each charging time stage does not need to be analyzed, the data processing amount is reduced, the processing steps of the battery capacity consistency are simplified, the performance of the battery pack can be accurately reflected according to the remaining power difference value, and the accuracy and the reliability of the capacity consistency analysis result are ensured.

In another embodiment, an apparatus for analyzing battery pack capacity consistency is provided, which includes, in addition to a signal obtaining module 1102, a power difference determining module 1104 and a consistency analyzing module 1106: suggestion module and charging condition detection module, wherein:

the electric quantity difference determining module 1104 is further configured to determine a first remaining electric quantity difference value of the battery pack at the charging start time according to a first maximum voltage signal of the battery cell with the largest charging voltage at the charging start time and a first minimum voltage signal with the smallest charging voltage;

and determining a second residual capacity difference value of the battery pack at the charging terminal moment according to the second maximum voltage signal of the battery cell with the maximum charging voltage and the second minimum voltage signal with the minimum charging voltage at the charging terminal moment.

The electric quantity difference determining module 1104 is further configured to determine, according to a conversion relationship between the cell voltage and the remaining electric quantity, a first remaining electric quantity corresponding to the first maximum voltage signal and a second remaining electric quantity corresponding to the first minimum voltage signal, respectively;

The electric quantity difference determining module 1104 is further configured to determine, according to a conversion relationship between the cell voltage and the remaining electric quantity, a third remaining electric quantity corresponding to the second maximum voltage signal and a fourth remaining electric quantity corresponding to the second minimum voltage signal, respectively;

The consistency analysis module 1106 is further configured to obtain a power difference threshold of the battery pack; and if the first residual electric quantity difference value is smaller than the electric quantity difference threshold value and the second residual electric quantity difference value is smaller than the electric quantity difference threshold value, determining that the electric core capacities of the battery packs are consistent.

The consistency analysis module 1106 is further configured to determine that the cell capacities of the battery packs are inconsistent if the first remaining capacity difference value is smaller than the capacity difference threshold and the second remaining capacity difference value is greater than or equal to the capacity difference threshold;

and if the first residual electric quantity difference value is larger than or equal to the electric quantity difference threshold value and the second residual electric quantity difference value is smaller than the electric quantity difference threshold value, determining that the electric core capacities of the battery packs are inconsistent.

The consistency analysis module 1106 is further configured to determine that the battery pack is under-balanced if the first remaining power difference is greater than the power difference threshold and the second remaining power difference is greater than the power difference threshold.

And the prompting module is used for generating prompting information for replacing the battery pack when the battery cell capacity of the battery pack is consistent and the capacity of the battery pack is insufficient.

The prompting module is further used for acquiring the electric box number of the electric core in the battery pack corresponding to the first maximum voltage signal or the second maximum voltage signal when the capacity of the electric core of the battery pack is inconsistent and the capacity of the battery pack is insufficient; and generating prompt information for replacing the electronic box corresponding to the electronic box number.

And the prompting module is also used for generating prompting information for updating the balance control of the battery pack when the capacity of the battery pack is insufficient and the balance is insufficient.

The charging condition detection module is used for acquiring charging condition data of the battery pack; the charging condition data comprises the residual electric quantity and the end voltage of the battery pack; and detecting that the residual electric quantity is within a preset electric quantity variation range, and the ending voltage is greater than the preset voltage.

The modules in the device for analyzing the consistency of the battery pack capacity may be wholly or partially implemented by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 12. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used to store raw battery data relating to the charging and discharging phases of the battery pack. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of analyzing battery pack capacity consistency.

Those skilled in the art will appreciate that the architecture shown in fig. 12 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.

In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.

In an embodiment, a computer program product is provided, comprising a computer program which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.

It should be noted that the data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), magnetic Random Access Memory (MRAM), ferroelectric Random Access Memory (FRAM), phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), for example. The databases involved in the embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for analyzing battery pack capacity consistency, the method comprising:

2. The method of claim 1, wherein the first voltage signals of the at least two cells at the charging start time comprise: a first maximum voltage signal of a battery cell with the maximum charging voltage at the charging starting moment and a first minimum voltage signal with the minimum charging voltage; the second voltage signals of the at least two battery cells at the charging end time include: a second maximum voltage signal of the battery cell with the maximum charging voltage and a second minimum voltage signal with the minimum charging voltage at the charging terminal moment;

determining a first residual capacity difference value of the battery pack at the charging starting moment according to a first maximum voltage signal of the battery cell with the maximum charging voltage and a first minimum voltage signal of the battery cell with the minimum charging voltage at the charging starting moment;

and determining a second remaining capacity difference value of the battery pack at the charging terminal moment according to a second maximum voltage signal of the battery cell with the maximum charging voltage and a second minimum voltage signal with the minimum charging voltage at the charging terminal moment.

3. The method of claim 2, wherein the determining a first remaining capacity difference value of the battery pack at the charging start time according to the first maximum voltage signal of the battery cell with the largest charging voltage and the first minimum voltage signal with the smallest charging voltage at the charging start time comprises:

4. The method of claim 2, wherein the determining a second remaining capacity difference value of the battery pack at the charging end time according to the second maximum voltage signal and the second minimum voltage signal of the cell with the maximum charging voltage and the second minimum voltage signal with the minimum charging voltage at the charging end time comprises:

5. The method according to any one of claims 1 to 4, wherein the analyzing the capacity consistency of the battery pack according to the first remaining capacity difference value and the second remaining capacity difference value comprises:

6. The method according to any one of claims 1 to 4, wherein the analyzing the capacity consistency of the battery pack according to the first remaining capacity difference value and the second remaining capacity difference value comprises:

if the first remaining power difference value is smaller than a power difference threshold value and the second remaining power difference value is larger than or equal to the power difference threshold value, determining that the cell capacities of the battery packs are inconsistent;

7. The method according to any one of claims 1 to 4, wherein the analyzing the capacity consistency of the battery pack according to the first remaining capacity difference value and the second remaining capacity difference value comprises:

8. The method of claim 5, further comprising:

9. The method of claim 6, further comprising:

when the capacity of the battery cells of the battery pack is inconsistent and the capacity of the battery pack is insufficient, acquiring the electrical box number of the battery cell corresponding to the first maximum voltage signal or the second maximum voltage signal in the battery pack;

10. The method of claim 7, further comprising:

and when the capacity of the battery pack is insufficient and the balance is insufficient, generating prompt information for updating the balance control of the battery pack.

11. The method of claim 1, wherein prior to the obtaining the battery pack of the first voltage signals of the at least two cells of the battery pack at the start of charging and the second voltage signals of the at least two cells at the end of charging, the method further comprises:

and if the residual electric quantity is within a preset electric quantity variation range and the ending voltage is greater than a preset voltage, executing the battery pack step of acquiring first voltage signals of at least two electric cores of the battery pack at the charging starting moment and second voltage signals of at least two electric cores of the battery pack at the charging tail end moment.

12. An apparatus for analyzing consistency of battery pack capacity, the apparatus comprising:

the electric quantity difference determining module is used for determining a first residual electric quantity difference value of the battery pack at the charging starting moment according to the first voltage signals of the at least two battery cells, and determining a second residual electric quantity difference value of the battery pack at the charging tail end moment according to the second voltage signals of the at least two battery cells;

13. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any one of claims 1 to 11 when executing the computer program.

14. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 11.

15. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 11 when executed by a processor.