Analysis Method, Device and Computer Equipment for Battery Capacity Consistency

Abstract

The present application relates to a method, apparatus, computer device, storage medium, and computer program product for analyzing battery pack capacity consistency. The method comprises: obtaining first voltage signals of at least two battery cells of the battery pack at the start of charging, and second voltage signals of at least two battery cells at the end of charging; determining a first remaining power difference value of the battery pack at the start of charging based on 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 end of charging based on the second voltage signals of the at least two battery cells; and analyzing the capacity consistency of the battery pack based on the first remaining power difference value and the second remaining power difference value. This method can simplify the analysis operation of battery pack capacity consistency and ensure the reliability and accuracy of the analysis.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a method, apparatus, computer equipment, storage medium, and computer program product for analyzing battery capacity consistency. Background Art

[0002] As an important energy storage component, power batteries are important energy storage components of electric vehicles. For example, the performance of power batteries is closely related to the normal operation and good work of the vehicle.

[0003] Electric vehicle power batteries undergo repeated charging and discharging during use, which can lead to inconsistencies between the battery cells. This inconsistency directly impacts battery performance and safety, potentially posing a safety hazard to electric vehicles. Therefore, it is necessary to assess the capacity consistency of power batteries and identify any issues.

[0004] However, the current method for identifying battery capacity consistency is to test the electrochemical AC impedance spectrum of each battery through experimental equipment and perform fingerprint identification on the electrochemical AC impedance spectrum. Based on the experimental equipment, it can only analyze the battery capacity consistency in specific scenarios and generate multi-dimensional analysis data, making the battery capacity consistency analysis complicated. Summary of the Invention

[0005] Based on this, it is necessary to provide a battery capacity consistency analysis method, device, computer equipment, computer-readable storage medium and computer program product that can solve the complex problem of battery capacity consistency analysis in response to the above technical problems.

[0006] In a first aspect, the present application provides a method for analyzing battery capacity consistency. The method comprises:

[0007] Acquire first voltage signals of at least two cells of the battery pack at the start of charging, and second voltage signals of at least two cells of the battery pack at the end of charging;

[0008] determining a first remaining power difference value of the battery pack at the start of charging 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 end of charging according to the second voltage signals of the at least two battery cells;

[0009] The capacity consistency of the battery pack is analyzed according to the first remaining power difference value and the second remaining power difference value.

[0010] In the above embodiment, when analyzing the battery capacity consistency, the voltage signals of at least two battery cells of the battery pack at the start and end of charging during the charging stage are obtained, and the difference in the remaining power of the battery pack at the start and end of charging is determined based on the obtained voltage signals of the at least two battery cells. The capacity consistency of the battery pack during the charging process is analyzed based on the difference in the remaining power at the start and end of charging. There is no need to analyze the charging data of the battery pack at each time stage of charging, which reduces the amount of data processing and simplifies the processing steps of the battery capacity consistency analysis. The performance of the battery pack can be accurately reflected based on the difference in the remaining power, thereby ensuring the accuracy and reliability of the capacity consistency analysis results.

[0011] In one embodiment, the first voltage signals of the at least two battery cells at the start of charging include: a first maximum voltage signal of the battery cell with the largest charging voltage at the start of charging and a first minimum voltage signal of the battery cell with the smallest charging voltage; the second voltage signals of the at least two battery cells at the end of charging include: a second maximum voltage signal of the battery cell with the largest charging voltage at the end of charging and a second minimum voltage signal of the battery cell with the smallest charging voltage;

[0012] Determining a first remaining power difference value of the battery pack at the start of charging 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 end of charging according to the second voltage signals of the at least two battery cells, including:

[0013] determining a first remaining capacity difference value of the battery pack at the charging start time 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 start time;

[0014] A second remaining power difference value of the battery pack at the end of charging is determined 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 end of charging.

[0015] In the above embodiment, the remaining power difference values at the corresponding moments are determined based on the maximum voltage signal of the battery cell with the maximum charging voltage and the minimum voltage signal of the battery cell with the minimum charging voltage corresponding to the charging start moment and the charging end moment, respectively. There is no need to obtain charging data at other moments, thereby reducing the amount of data processing.

[0016] In one embodiment, determining a first remaining power difference value of the battery pack at the charging start time based on a first maximum voltage signal of a battery cell having a maximum charging voltage and a first minimum voltage signal of a battery cell having a minimum charging voltage at the charging start time includes:

[0017] Determine, according to a conversion relationship between the battery 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;

[0018] A first remaining power difference value of the battery pack at the charging start time is determined according to the difference between the first remaining power and the second remaining power.

[0019] In the above embodiment, the remaining power corresponding to the maximum voltage signal and the minimum voltage signal at the start of charging is determined based on the conversion relationship between voltage and remaining power. The battery capacity at the start and end of charging can be accurately determined based on the remaining power.

[0020] In one embodiment, determining the second remaining power difference value of the battery pack at the end of charging based on 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 end of charging includes:

[0021] Determine, according to a conversion relationship between the battery cell voltage and the remaining power, a third remaining power corresponding to the second maximum voltage signal and a fourth remaining power corresponding to the second minimum voltage signal;

[0022] A second remaining power difference value of the battery pack at the end of charging is determined according to the difference between the third remaining power and the fourth remaining power.

[0023] In the above embodiment, the remaining power corresponding to the maximum voltage signal and the minimum voltage signal at the end of charging is determined based on the conversion relationship between voltage and remaining power. The battery capacity at the end of charging can be accurately determined based on the remaining power.

[0024] In one embodiment, analyzing the capacity consistency of the battery pack according to the first remaining power difference and the second remaining power difference includes:

[0025] If the first remaining power difference is smaller than a 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.

[0026] In the above embodiment, by comparing the difference in the remaining power at the start of charging of the battery pack and the remaining power at the end of charging to be less than the power difference threshold, it is accurately determined that the cell capacities of the battery pack are consistent.

[0027] In one embodiment, analyzing the capacity consistency of the battery pack according to the first remaining power difference and the second remaining power difference includes:

[0028] If the first remaining power difference is less than a power difference threshold, and the second remaining power difference is greater than or equal to the power difference threshold, determining that the cell capacities of the battery pack are inconsistent;

[0029] 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 is determined that the cell capacities of the battery pack are inconsistent.

[0030] In the above embodiment, by determining that the difference in the remaining power at the start or end of charging is greater than or equal to the power difference threshold, it is accurately determined that the battery capacity is inconsistent due to the difference between some battery cells.

[0031] In one embodiment, analyzing the capacity consistency of the battery pack according to the first remaining power difference and the second remaining power difference includes:

[0032] If the first remaining power difference is greater than a power difference threshold, and the second remaining power difference is greater than the power difference threshold, it is determined that the battery pack is insufficiently balanced.

[0033] In the above embodiment, by determining that the difference in the remaining power between the charging start time and the charging end time is greater than the power difference threshold, it is accurately determined that the inconsistent battery capacities are caused by insufficient balancing of the battery pack.

[0034] In one embodiment, the method further comprises:

[0035] When the cell capacities of the battery packs are consistent and the capacity of the battery pack is insufficient, a prompt message for replacing the battery pack is generated.

[0036] In the above embodiment, when the cell capacities of the battery packs are consistent, the safety of use is improved by replacing the battery packs.

[0037] In one embodiment, the method further comprises:

[0038] When it is determined that the cell capacities of the battery pack are inconsistent and the capacity of the battery pack is insufficient, obtaining a cell box number in the battery pack corresponding to the first maximum voltage signal or the second maximum voltage signal;

[0039] Generate a prompt message for replacing the electrical box corresponding to the electrical box number.

[0040] In the above embodiment, when it is determined that the cell capacities of the battery pack are inconsistent, the battery pack to which the attenuated cell belongs is determined and the battery pack with low capacity is replaced, thereby improving the safety and service life of the battery pack.

[0041] In one embodiment, the method further comprises:

[0042] When the capacity of the battery pack is insufficient and the battery pack is insufficiently balanced, prompt information for updating the balancing control of the battery pack is generated.

[0043] In the above embodiment, when the capacity of the battery pack is insufficient and the battery pack is not balanced enough, the battery pack capacity is ensured and resource utilization is improved by updating the battery pack balancing control.

[0044] In one embodiment, before acquiring the first voltage signals of at least two cells of the battery pack at the start of charging and the second voltage signals of at least two cells of the battery pack at the end of charging, the method further includes:

[0045] Acquiring charging condition data of the battery pack; the charging condition data includes the remaining power and the end voltage of the battery pack;

[0046] If the remaining power is within the preset power variation range and the end voltage is greater than the preset voltage, the step of obtaining the first voltage signal of at least two battery cells of the battery pack at the start of charging and the second voltage signal of at least two battery cells at the end of charging is executed.

[0047] In the above embodiment, the charging segments that meet the requirements are screened out according to the preset power variation range and the preset voltage, thereby further ensuring the reliability and accuracy of the battery capacity consistency analysis.

[0048] In a second aspect, the present application also provides a device for analyzing battery capacity consistency. The device comprises:

[0049] a signal acquisition module, configured to acquire first voltage signals of at least two cells of the battery pack at the start of charging, and second voltage signals of at least two cells of the battery pack at the end of charging;

[0050] a power difference determining module, configured to determine a first remaining power difference value of the battery pack at the start of charging based on the first voltage signals of the at least two battery cells, and to determine a second remaining power difference value of the battery pack at the end of charging based on the second voltage signals of the at least two battery cells;

[0051] The consistency analysis module is configured to analyze the capacity consistency of the battery pack according to the first remaining power difference value and the second remaining power difference value.

[0052] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are performed:

[0053] Acquire first voltage signals of at least two cells of the battery pack at the start of charging, and second voltage signals of at least two cells of the battery pack at the end of charging;

[0054] determining a first remaining power difference value of the battery pack at the start of charging 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 end of charging according to the second voltage signals of the at least two battery cells;

[0055] The capacity consistency of the battery pack is analyzed according to the first remaining power difference value and the second remaining power difference value.

[0056] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the following steps:

[0057] Acquire first voltage signals of at least two cells of the battery pack at the start of charging, and second voltage signals of at least two cells of the battery pack at the end of charging;

[0058] determining a first remaining power difference value of the battery pack at the start of charging 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 end of charging according to the second voltage signals of the at least two battery cells;

[0059] The capacity consistency of the battery pack is analyzed according to the first remaining power difference value and the second remaining power difference value.

[0060] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the following steps:

[0061] Acquire first voltage signals of at least two cells of the battery pack at the start of charging, and second voltage signals of at least two cells of the battery pack at the end of charging;

[0062] determining a first remaining power difference value of the battery pack at the start of charging 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 end of charging according to the second voltage signals of the at least two battery cells;

[0063] The capacity consistency of the battery pack is analyzed according to the first remaining power difference value and the second remaining power difference value.

[0064] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0066] Figure 1 FIG. 1 is an application environment diagram of a method for analyzing battery capacity consistency in one embodiment;

[0067] Figure 2 1 is a flow chart of a method for analyzing battery capacity consistency in one embodiment;

[0068] Figure 3 A charging curve diagram of a battery cell of a battery pack during a charging stage in one embodiment;

[0069] Figure 4 1 is a flow chart of a method for determining a remaining power difference value in one embodiment;

[0070] Figure 5 A curve diagram corresponding to the conversion relationship between cell voltage and remaining capacity in one embodiment;

[0071] Figure 6 FIG1 is a flow chart of steps for analyzing battery pack capacity consistency in one embodiment;

[0072] Figure 7 A schematic diagram showing that the overall capacity attenuation of battery packs is the same in one embodiment;

[0073] Figure 8 A schematic diagram of attenuation of a single battery cell in a battery pack according to an embodiment;

[0074] Figure 9 A schematic diagram of insufficient balancing of a battery pack according to one embodiment;

[0075] Figure 10 1 is a flow chart of a method for analyzing battery capacity consistency according to another embodiment;

[0076] Figure 11 is a structural block diagram of a device for analyzing battery capacity consistency in one embodiment;

[0077] Figure 12FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0078] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0080] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0081] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0082] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0083] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0084] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0085] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0086] With the development of new energy technologies, new energy power batteries have gradually gained market share and are widely used. As a key energy storage component, power batteries have a capacity that is one of their most important performance indicators. Power batteries undergo repeated charging and discharging during use. When a battery pack leaves the factory, the capacity of each cell in the same pack remains consistent within the allowable error range. However, as the battery pack ages and is affected by external factors, the cells within the pack are affected to a certain extent, resulting in inconsistent cell capacity within the pack. This inconsistent cell capacity can affect the pack's service life and pose a safety hazard. Therefore, it is necessary to analyze the consistency of battery pack capacity.

[0087] Currently, when analyzing battery pack capacity consistency, the existing method uses a fingerprint recognition algorithm to identify the multi-dimensional EIS curve cluster of the battery to be evaluated, determine the SOH (state-of-health) and SOC (state of charge, also known as remaining capacity) status of the battery to be evaluated; batteries with consistent SOH are grouped together, and the similarity between the graphs of the batteries in the group is used to further evaluate the consistency. However, this method can only analyze the battery pack capacity consistency in specific scenarios, and requires specific hardware equipment to determine the multi-dimensional EIS curve cluster, which makes data analysis and processing complex.

[0088] Therefore, a method is proposed that can solve the complex problem of battery capacity consistency analysis. In this method, first voltage signals of at least two battery cells of the battery pack at the start of charging and second voltage signals of at least two battery cells at the end of charging are obtained; a first remaining power difference value of the battery pack at the start of charging is determined based on the first voltage signals of the at least two battery cells, and a second remaining power difference value of the battery pack at the end of charging is determined based on the second voltage signals of the at least two battery cells; and the capacity consistency of the battery pack is analyzed based on the first remaining power difference value and the second remaining power difference value.

[0089] By obtaining the voltage signals of at least two battery cells of the battery pack at the start and end of charging during the charging stage, the difference in the remaining power of the battery pack at the start and end of charging is determined based on the obtained voltage signals of the at least two battery cells. The capacity consistency of the battery pack in any scenario is analyzed based on the difference in the remaining power at the start and end of charging. There is no need to analyze the charging data of the battery pack at each time stage of charging, which reduces the amount of data processing and simplifies the processing steps of battery capacity consistency. The performance of the battery pack can be accurately reflected based on the difference in the remaining power, ensuring the accuracy and reliability of the capacity consistency analysis results.

[0090] It is understood that the battery pack in this application can be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft. Figure 1 As shown, it is an application environment diagram of the battery capacity consistency analysis method, the battery pack is applied to the electric vehicle 102, and the electric vehicle uploads the acquired charging data to the cloud server 104, and the cloud server obtains the first voltage signals of at least two battery cells of the battery pack at the start of charging, and the second voltage signals of at least two battery cells at the end of charging from the charging data; according to the first voltage signals of the at least two battery cells, the first remaining power difference value of the battery pack at the start of charging is determined, and according to the second voltage signals of the at least two battery cells, the second remaining power difference value of the battery pack at the end of charging is determined; according to the first remaining power difference value and the second remaining power difference value, the capacity consistency of the battery pack is analyzed.

[0091] In one embodiment, Figure 2 As shown in the figure, a battery capacity consistency analysis method is provided, which is applied to Figure 1 The following steps are used as an example to illustrate the cloud in the following example:

[0092] Step 202 : Acquire first voltage signals of at least two cells of the battery pack at the start of charging, and second voltage signals of at least two cells at the end of charging.

[0093] The battery pack may include parallel-connected battery boxes, which include multiple battery cells connected in series. During use, the battery pack undergoes charging and discharging processes, and the battery pack may have insufficient capacity. It is necessary to analyze the capacity consistency of the battery pack to effectively identify the capacity consistency of the battery pack. Insufficient capacity can be understood as the battery pack failing to reach the preset working capacity when fully charged. Depending on different application scenarios, the preset working capacity can be a preset working time or a preset driving mileage, etc.

[0094] The charging start time can be understood as the time when the battery pack is powered on under normal charging conditions, and the charging end time can be understood as the time when the battery pack is powered off under normal charging conditions, or the time when the battery pack is fully charged. Figure 3 The figure shows a charging curve diagram (cell voltage - charging current) of the battery pack's cells during the charging phase. As charging time changes, the charging voltage and charging current of Cell 1 and Cell 2 also change from the start of charging to the end of charging. The at least two cells at the start of charging include the two cells with the maximum and minimum charging voltages at the start of charging, and the at least two cells at the end of charging include the two cells with the maximum and minimum charging voltages at the end of charging. The at least two cells at the start of charging and the at least two cells at the end of charging can be exactly the same, completely different, or partially identical.

[0095] The voltage signal refers to the signal of the battery cell in the charging state. "First" and "second" are only used to distinguish the voltage signals of the battery cells at different times. The obtained voltage signal is determined based on the original battery data obtained. The original battery signal data includes the voltage signal of the battery cell in the battery pack, the current signal of the battery cell, the battery cell position identification, the charging flag and the discharge flag, etc. Among them, the voltage signal and current signal during the charging period have corresponding charging flags, and the voltage signal and current signal during the discharging period have corresponding discharge flags. The battery cell position identification can be the battery box to which the battery cell belongs and its position in the battery box.

[0096] Specifically, the cloud obtains the original battery data of the battery pack, pre-processes the original battery data, and filters out the voltage signal corresponding to the charging flag from the pre-processed original battery data. The voltage signals of at least two battery cells at the start of charging and the voltage signals of at least two battery cells at the end of charging are determined from the voltage signal according to the remaining power of the battery pack. Among them, the pre-processing includes modifying or clearing the original battery data with null values, illegal formats (such as garbled characters), default values, value ranges exceeding the attribute, and repeated time series data. For example, taking the application of battery packs in electric vehicles as an example, there will be signal interference or poor signal conditions during the driving process of the electric vehicle. During the driving process of the electric vehicle, the battery pack is in a discharging state. The original battery data collected by the vehicle end will be lost or unable to be reported to the cloud, which will cause the original battery data received by the cloud to be garbled or empty.

[0097] Step 204 : determining a first remaining power difference value of the battery pack at the start of charging based on 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 end of charging based on the second voltage signals of the at least two battery cells.

[0098] It's understandable that the battery cell voltage changes nonlinearly during charging, making it impossible to accurately and qualitatively analyze battery pack capacity consistency based on nonlinearly changing voltage signals. A corresponding conversion relationship exists between cell voltage and remaining charge, which can be determined using existing voltage and remaining charge conversion methods, which will not be detailed here.

[0099] Specifically, the charging voltages of the at least two battery cells at the start of charging are determined based on the first voltage signals of the at least two battery cells, the remaining capacities of the at least two battery cells are determined based on the corresponding conversion relationship between the battery cell voltages and the remaining capacities, and the remaining capacities of the at least two battery cells are obtained based on the difference between the remaining capacities of the at least two battery cells, i.e., the first remaining capacities difference value. The voltages of the at least two battery cells at the end of charging are determined based on the second voltage signals of the at least two battery cells, the remaining capacities of the at least two battery cells are determined based on the corresponding conversion relationship between the battery cell voltages and the remaining capacities, and the remaining capacities of the at least two battery cells are obtained based on the difference between the remaining capacities of the at least two battery cells, i.e., the second remaining capacities difference value.

[0100] Step 206 : Analyze the capacity consistency of the battery pack according to the first remaining power difference value and the second remaining power difference value.

[0101] Specifically, based on the remaining power difference value at the start of charging and the remaining power difference value at the end of charging, a consistency analysis of the battery pack capacity is performed to obtain a pre-configured power difference threshold. The power difference threshold is used to detect whether the capacity of the battery cells of the battery pack can be fully charged simultaneously within a set time. Based on the relationship between the first remaining power difference value and the power difference threshold, as well as the relationship between the second remaining power difference value and the power difference threshold, the capacity consistency of the battery pack can be determined and analyzed.

[0102] Furthermore, at the start of charging, if the first remaining power difference value is less than the power difference threshold, it means that the cells of the battery pack remain basically consistent at the start of charging. In order to further detect the battery pack capacity consistency, it is determined whether the second remaining power difference value of the battery pack at the end of charging is less than the power difference threshold. If it is less than the power difference threshold, it means that the cells of the battery pack remain basically consistent at the end of charging, and the battery pack capacity consistency is good. If it is greater than or equal to the power difference threshold, it means that there is a large difference in the capacity between the cells of the battery pack at the end of charging, and the battery pack capacity consistency is poor. In order to ensure the accuracy and reliability of the battery pack capacity consistency, the battery pack capacity consistency is analyzed based on the remaining power. At the same time, with the promotion of the application of power batteries, in order to ensure that the battery pack capacity consistency in different scenarios can be analyzed, the battery pack capacity consistency is analyzed by determining the remaining power difference value at the start of charging and the remaining power difference value at the end of charging.

[0103] When determining the first remaining power difference value of the battery pack at the start of charging based on the first voltage signals of at least two battery cells, and determining the second remaining power difference value of the battery pack at the end of charging based on the second voltage signals of at least two battery cells, the first remaining power difference value at the start of charging can be determined based on 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 start of charging, and the second remaining power difference value at the end of charging can be determined based on the second maximum voltage signal of the battery cell with the largest charging voltage and the second minimum voltage signal with the smallest charging voltage at the end of charging. Figure 4 As shown, a method for determining the difference value of the remaining power is provided, and the method is applied to Figure 1 The following steps are used as an example to illustrate the cloud in the following example:

[0104] Step 402 : determining a first remaining capacity difference value of the battery pack at the charging start time based on 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 start time.

[0105] Among them, at the start of charging, there may be at least two first maximum voltage signals of the battery cell with the largest charging voltage at the same time, and at least two first minimum voltage signals of the battery cell with the smallest charging voltage at the same time. You can arbitrarily select one from the battery cell with the largest charging voltage and determine the battery cell position of the corresponding battery cell, and arbitrarily select one from the battery cell with the smallest charging voltage and determine the battery cell position of the corresponding battery cell. Determine the corresponding remaining power based on the first maximum voltage signal of the battery cell with the largest charging voltage, determine the corresponding remaining power based on the first minimum voltage signal of the battery cell with the smallest charging voltage, and determine the difference between the remaining power determined by the first maximum voltage signal and the remaining power determined by the first minimum voltage signal to determine the first remaining power difference value of the battery pack at the start of charging.

[0106] Step 404 : determining a second remaining capacity difference value of the battery pack at the end of charging based on 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 end of charging.

[0107] Among them, at the end of charging, there may be at least two second maximum voltage signals of the cell with the largest charging voltage at the same time, and at least two second minimum voltage signals of the cell with the smallest charging voltage at the same time. You can arbitrarily select one from the cell with the largest charging voltage and determine the cell position of the corresponding cell, and arbitrarily select one from the cell with the smallest charging voltage and determine the cell position of the corresponding cell. Determine the corresponding remaining power based on the second maximum voltage signal of the cell with the largest charging voltage, determine the corresponding remaining power based on the second minimum voltage signal of the cell with the smallest charging voltage, determine the difference between the remaining power determined by the second maximum voltage signal and the remaining power determined by the second minimum voltage signal, and determine the second remaining power difference value of the battery pack at the end of charging.

[0108] In one embodiment, in one embodiment, according to the conversion relationship between the cell voltage and the remaining power, the first remaining power corresponding to the first maximum voltage signal and the second remaining power corresponding to the first minimum voltage signal are determined respectively; according to the difference between the first remaining power and the second remaining power, the first remaining power difference value of the battery pack at the start of charging is determined. According to the conversion relationship between the cell voltage and the remaining power, the third remaining power corresponding to the second maximum voltage signal and the fourth remaining power corresponding to the second minimum voltage signal are determined respectively; according to the difference between the third remaining power and the fourth remaining power, the second remaining power difference value of the battery pack at the end of charging is determined. Wherein, the conversion relationship between the cell voltage and the remaining power is as follows: Figure 5As shown, according to the curve corresponding to the conversion relationship between the cell voltage and the remaining power, the remaining power corresponding to different voltages can be determined. 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 following can be obtained: Figure 5 The curve shown is used to obtain the first remaining power SOCs_max, the second remaining power SOCs_min, the third remaining power SOCp_max, and the fourth remaining power SOCp_min, and calculate the first remaining power difference value delta_soc_init at the start of charging and the second remaining power difference value delta_soc_peak at the end of charging.

[0109] That is, based on the conversion relationship between voltage and remaining power, the remaining power corresponding to the maximum voltage signal and the minimum voltage signal at the start and end of charging is determined. Based on the remaining power, the battery capacity at the start and end of charging can be accurately determined. There is no need to obtain charging data at other times, reducing the amount of data processing.

[0110] In the above embodiment, the remaining power difference values at the corresponding moments are determined based on the maximum voltage signal of the battery cell with the maximum charging voltage and the minimum voltage signal of the battery cell with the minimum charging voltage corresponding to the charging start moment and the charging end moment, respectively. There is no need to obtain charging data at other moments, thereby reducing the amount of data processing.

[0111] After obtaining the first remaining power difference value of the battery pack at the start time of charging and the second remaining power difference value at the end time of charging, while analyzing the consistency of the battery pack capacity, the specific analysis of the consistency and inconsistency of the battery pack capacity can be accurately determined according to the status of the battery pack.

[0112] In one embodiment, Figure 6 FIG. 1 shows the steps for analyzing battery pack capacity consistency in one embodiment, including the following:

[0113] Step 602: Obtain a battery power difference threshold value.

[0114] Step 604 , determining whether the first remaining power difference is less than a power difference threshold and determining whether the second remaining power difference is less than a power difference threshold.

[0115] Step 606 : 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.

[0116] Specifically, if the first remaining power difference at the start of charging the battery pack is less than the power difference threshold, and the second remaining power difference at the end of charging the battery pack is less than the power difference threshold, it indicates that the capacity of each cell in the battery pack is consistent within the allowable capacity deviation range, that is, the cell capacity of the entire battery pack is the same. Furthermore, if there is a battery in the battery pack with insufficient capacity, it indicates that the overall capacity attenuation of the battery pack is the same, such as Figure 7 As shown in the figure, it is a schematic diagram of the battery pack with the same overall capacity attenuation. The guaranteed capacity can be understood as the capacity that the battery cell can reach after a period of use.

[0117] Step 608 : If the first remaining power difference is less 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 pack are inconsistent.

[0118] Specifically, if the first remaining power difference at the start of charging the battery pack is less than the power difference threshold, and the second remaining power difference at the end of charging the battery pack is greater than or equal to the power difference threshold, it indicates that the capacities of the cells in the battery pack are inconsistent. Furthermore, if the battery pack is a battery with insufficient capacity, if the first remaining power difference is less than the power difference threshold, and the second remaining power difference is greater than or equal to the power difference threshold, it indicates that there is a single cell attenuation in the battery pack. Figure 8 The figure shows a schematic diagram of the attenuation of a single cell in a battery pack.

[0119] For example, at the start of charging, the battery pack has the highest charging voltage in cell 1, the lowest charging voltage in cell 2, and the difference in remaining charge between cells 1 and 2 is less than the charge difference threshold. At the end of charging, the battery pack has the highest charging voltage in cell 1, the lowest charging voltage in cell 3, and the difference between the remaining charge in cell 1 and the remaining charge in cell 2 is greater than or equal to the charge difference threshold, indicating that cell 1 has experienced a decay anomaly.

[0120] For example, at the start of charging, cell 1 has the highest charging voltage, cell 2 has the lowest charging voltage, and the difference between the remaining charges of cells 1 and 2 is less than the charge difference threshold. At the end of charging, cell 3 has the highest charging voltage, cell 4 has the lowest charging voltage, and the difference between the remaining charge of cell 3 and the remaining charge of cell 4 is greater than or equal to the charge difference threshold, indicating that cell 3 has experienced a decay anomaly.

[0121] 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 less than the power difference threshold, it is determined that the cell capacities of the battery pack are inconsistent.

[0122] 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 in the battery pack are inconsistent. Furthermore, 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 a single cell in the battery pack is attenuated.

[0123] For example, at the start of charging, the battery pack has the highest charging voltage in cell 5 and the lowest charging voltage in cell 6. The difference between the remaining charge in cell 5 and the remaining charge in cell 6 is greater than or equal to the charge difference threshold. At the end of charging, the battery pack has the highest charging voltage in cell 5 and the lowest charging voltage in cell 6. If the difference between the remaining charge in cell 5 and the remaining charge in cell 6 is less than the charge difference threshold, it indicates that cell 6 has experienced a decay abnormality.

[0124] For example, at the start of charging, cell 5 has the highest charging voltage, cell 6 has the lowest charging voltage, and the difference between the remaining charge of cell 5 and the remaining charge of cell 6 is greater than or equal to the charge difference threshold. At the end of charging, cell 7 has the highest charging voltage, cell 8 has the lowest charging voltage, and the difference between the remaining charge of cell 7 and the remaining charge of cell 8 is less than the charge difference threshold, indicating that cell 5 has experienced a decay anomaly.

[0125] 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 indicates that the battery pack is insufficiently balanced.

[0126] Among them, insufficient battery pack balancing may be due to the internal structure of the battery cells in the battery pack, the self-discharge of the battery cells in the battery pack, and the inconsistency of the self-discharge rate of each battery cell.

[0127] Specifically, if the battery pack capacity is insufficient, 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 indicates that the battery pack is insufficiently balanced. Figure 9 The figure shows a schematic diagram of insufficient balancing of a battery pack, where the discharge times of the cells in the battery pack are inconsistent.

[0128] In the above embodiment, the battery pack capacity consistency is accurately analyzed based on the size relationship between the first remaining power difference value at the start of charging and the power difference threshold, as well as the size relationship between the second remaining power difference value at the end of charging and the power difference threshold, to obtain analysis results of capacity consistency and inconsistency.

[0129] When confirming that the capacity of the battery packs is consistent, if the capacity of the battery packs is insufficient, the battery packs need to be replaced.

[0130] In one embodiment, when the cell capacities of the battery packs are consistent and the battery pack capacity is insufficient, a prompt message is generated to replace the battery pack. When the capacity degradation of the battery packs is uniform across the board, the battery packs can be replaced to ensure battery capacity. For example, if the battery pack capacity of an electric vehicle is insufficient and the capacity degradation of the battery packs is uniform across the board, replacing the battery packs can ensure the safety and service life of the electric vehicle.

[0131] When determining that the capacity of the battery pack is inconsistent, if the capacity of the battery pack is insufficient, the battery box corresponding to the battery cell needs to be replaced. In one embodiment, when the battery cell capacity of the battery pack as a whole is inconsistent and the capacity of the battery pack is insufficient, the battery box number of the battery cell corresponding to the first maximum voltage signal or the second maximum voltage signal in the battery pack is obtained; and a prompt message for replacing the battery box corresponding to the battery box number is generated. By determining the battery box to which the attenuated battery cell belongs, the battery box with low capacity is replaced to ensure the capacity of the battery pack. If the battery cell capacity of the battery pack as a whole is inconsistent, it means that the capacity attenuation of some batteries in the battery pack is abnormal. For example, in an electric vehicle, if there is attenuation of a single battery cell in the battery pack, the battery box corresponding to the attenuated battery cell is replaced to ensure the driving safety of the electric vehicle and extend the service life of the electric vehicle.

[0132] In one embodiment, when the battery pack capacity is insufficient and the cell capacity of the battery pack is insufficiently balanced, a prompt message is generated to update the battery pack's balancing control. When the battery pack is insufficiently balanced, the battery pack's balancing control is updated to ensure the battery pack capacity and improve resource utilization.

[0133] In another embodiment, Figure 10 As shown in the figure, a battery capacity consistency analysis method is provided, which is applied to Figure 1 The following steps are used as an example to illustrate the cloud in the following example:

[0134] Step 1002 , obtaining charging condition data of the battery pack; the charging condition data includes the remaining power and the end voltage of the battery pack.

[0135] The end voltage may be the voltage at which the battery pack is finished charging.

[0136] Step 1004: If the remaining power is within the preset power variation range and the end voltage is greater than the preset voltage, obtain first voltage signals of at least two cells of the battery pack with insufficient capacity at the start of charging and second voltage signals of at least two cells at the end of charging.

[0137] The preset power variation range may be less than 25%, and the preset voltage may be 3.4V, which can be understood as exceeding the platform area of the battery pack.

[0138] During use, the battery pack undergoes repeated charge and discharge processes. When charging, the remaining power of the battery pack is not always used up or falls below the preset remaining power. According to the characteristics of the battery itself, charging is performed when there is a lot of remaining power. The voltage of the battery pack does not change much, and the corresponding remaining power difference is also small. Therefore, it is impossible to accurately analyze the capacity consistency of the battery pack.

[0139] The first voltage signals of at least two battery cells at the start of charging include the first maximum voltage signal of the battery cell with the largest charging voltage and the first minimum voltage signal of the battery cell with the smallest charging voltage at the start of charging; the second voltage signals of at least two battery cells at the end of charging include the second maximum voltage signal of the battery cell with the largest charging voltage and the second minimum voltage signal of the battery cell with the smallest charging voltage at the end of charging.

[0140] Step 1006 : Determine 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 maximum charging voltage and the first minimum voltage signal of the battery cell with the minimum charging voltage at the charging start time.

[0141] Step 1008 : Determine a second remaining capacity difference value of the battery pack at the end of charging based on 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 end of charging.

[0142] Step 1010: Obtain a battery power difference threshold of the battery pack.

[0143] 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.

[0144] Step 1014 : If the cell capacities of the battery packs are consistent and the capacity of the battery packs is insufficient, a prompt message for replacing the battery pack is generated.

[0145] Step 1016 : If the first remaining power difference is less 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 pack are inconsistent.

[0146] 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 less than the power difference threshold, it is determined that the cell capacities of the battery pack are inconsistent.

[0147] Step 1020 : If the cell capacities of the battery pack are inconsistent and the capacity of the battery pack is insufficient, obtain the battery box number of the cell corresponding to the first maximum voltage signal or the second maximum voltage signal in the battery pack.

[0148] Step 1022: Generate prompt information for replacing the electrical box corresponding to the electrical box number.

[0149] Step 1024 : 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 is determined that the battery pack is insufficiently balanced.

[0150] Step 1026 : If the capacity of the battery pack is insufficient and the battery pack is not balanced enough, a prompt message for updating the balancing control of the battery pack is generated.

[0151] In the above-mentioned battery capacity consistency analysis method, qualified charging stages are screened based on a preset power range and a preset voltage. The battery pack's capacity consistency during the charging process is analyzed based on the difference in remaining power at the start and end of charging. The causes of insufficient capacity are classified and the corresponding maintenance method is determined. This eliminates the need to analyze the battery pack's charging data at each charging stage, reducing the amount of data processing and simplifying the battery capacity consistency processing steps. The remaining power difference can accurately reflect the battery pack's performance, ensuring the accuracy and reliability of the capacity consistency analysis results. The battery pack is then repaired according to the determined maintenance method, ensuring the safety and service life of the battery pack.

[0152] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0153] Based on the same inventive concept, an embodiment of the present application further provides a battery capacity consistency analysis device for implementing the aforementioned battery capacity consistency analysis method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more battery capacity consistency analysis device embodiments provided below can be found in the limitations of the battery capacity consistency analysis method described above and will not be repeated here.

[0154] In one embodiment, Figure 11 As shown, a device for analyzing battery pack capacity consistency is provided, including: a signal acquisition module 1102, a power difference determination module 1104 and a consistency analysis module 1106, wherein:

[0155] The signal acquisition module 1102 is configured to acquire first voltage signals of at least two cells of the battery pack at the start of charging, and second voltage signals of at least two cells of the battery pack at the end of charging;

[0156] a power difference determining module 1104, configured to determine a first remaining power difference value of the battery pack at the start of charging based on the first voltage signals of the at least two battery cells, and to determine a second remaining power difference value of the battery pack at the end of charging based on the second voltage signals of the at least two battery cells;

[0157] The consistency analysis module 1106 is configured to analyze the capacity consistency of the battery pack according to the first remaining power difference value and the second remaining power difference value.

[0158] In the above embodiment, by obtaining the voltage signals of at least two battery cells of the battery pack at the start time and the end time of charging during the charging stage, the difference in the remaining power of the battery pack at the start time and the end time of charging is determined based on the obtained voltage signals of the at least two battery cells, and the capacity consistency of the battery pack during the charging process is analyzed based on the difference in the remaining power at the start time and the end time of charging. There is no need to analyze the charging data of the battery pack at each time stage of charging, which reduces the amount of data processing and simplifies the processing steps of the battery capacity consistency. The performance of the battery pack can be accurately reflected according to the difference in the remaining power, thereby ensuring the accuracy and reliability of the capacity consistency analysis results.

[0159] In another embodiment, a device for analyzing battery pack capacity consistency is provided. In addition to a signal acquisition module 1102, a power difference determination module 1104, and a consistency analysis module 1106, the device further includes a prompt module and a charging condition detection module, wherein:

[0160] The power difference determining module 1104 is further configured to determine a first remaining power difference value of the battery pack at the charging start time based on a first maximum voltage signal of the battery cell with the largest charging voltage and a first minimum voltage signal of the battery cell with the smallest charging voltage at the charging start time;

[0161] A second remaining capacity difference value of the battery pack at the end of charging is determined 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 end of charging.

[0162] The power difference determination module 1104 is further configured to determine, based on 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;

[0163] A first remaining power difference value of the battery pack at the charging start time is determined according to the difference between the first remaining power and the second remaining power.

[0164] The power difference determination module 1104 is further configured to determine, based on a conversion relationship between the cell voltage and the remaining power, a third remaining power corresponding to the second maximum voltage signal and a fourth remaining power corresponding to the second minimum voltage signal;

[0165] A second remaining power difference value of the battery pack at the end of charging is determined according to the difference between the third remaining power and the fourth remaining power.

[0166] The consistency analysis module 1106 is further configured to obtain a battery capacity difference threshold; if the first remaining capacity difference is less than the capacity difference threshold, and the second remaining capacity difference is less than the capacity difference threshold, it is determined that the cell capacities of the battery pack are consistent.

[0167] The consistency analysis module 1106 is further configured to determine that the cell capacities of the battery pack are inconsistent if the first remaining power difference is less than a power difference threshold and the second remaining power difference is greater than or equal to the power difference threshold;

[0168] 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 is determined that the cell capacities of the battery pack are inconsistent.

[0169] The consistency analysis module 1106 is further configured to determine that the battery pack is insufficiently balanced if the first remaining power difference is greater than a power difference threshold and the second remaining power difference is greater than the power difference threshold.

[0170] The prompt module is used to generate a prompt message for replacing the battery pack when the cell capacities of the battery packs are consistent and the capacity of the battery packs is insufficient.

[0171] The prompt module is also used to obtain the battery box number of the battery cell corresponding to the first maximum voltage signal or the second maximum voltage signal in the battery pack when the battery cell capacity of the battery pack is inconsistent and the capacity of the battery pack is insufficient; and generate a prompt message for replacing the battery box corresponding to the battery box number.

[0172] The prompt module is further configured to generate prompt information for updating the balancing control of the battery pack when the capacity of the battery pack is insufficient and the balancing is insufficient.

[0173] The charging condition detection module is used to obtain the charging condition data of the battery pack; the charging condition data includes the remaining power and the end voltage of the battery pack; and detect whether the remaining power is within a preset power variation range and that the end voltage is greater than a preset voltage.

[0174] Each module in the battery pack capacity consistency analysis device described above can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0175] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 12 As shown. The computer device includes a processor, a memory and a network interface connected via a system bus. The processor of the computer device is used 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 the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store raw battery data related to the charging and discharging stages of the battery pack. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a method for analyzing the capacity consistency of a battery pack is implemented.

[0176] Those skilled in the art will understand that Figure 12 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0177] In one embodiment, a computer device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0178] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0179] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0180] It should be noted that the data involved in this application (including but not limited to data used for analysis, stored data, displayed data, etc.) are all information and data authorized by the user or fully authorized by all parties.

[0181] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0182] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0183] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for analyzing battery pack capacity consistency, characterized in that: The method comprises: Acquire first voltage signals of at least two cells of the battery pack at the start of charging, and second voltage signals of at least two cells of the battery pack at the end of charging; determining a first remaining power difference value of the battery pack at the start of charging 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 end of charging according to the second voltage signals of the at least two battery cells; analyzing the capacity consistency of the battery pack according to the first remaining power difference value and the second remaining power difference value; The first voltage signals of the at least two battery cells at the start of charging include: a first maximum voltage signal of the battery cell with the largest charging voltage at the start of charging and a first minimum voltage signal of the battery cell with the smallest charging voltage; the second voltage signals of the at least two battery cells at the end of charging include: a second maximum voltage signal of the battery cell with the largest charging voltage at the end of charging and a second minimum voltage signal of the battery cell with the smallest charging voltage; Determining a first remaining power difference value of the battery pack at the start of charging 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 end of charging according to the second voltage signals of the at least two battery cells, including: determining a first remaining capacity difference value of the battery pack at the charging start time 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 start time; A second remaining capacity difference value of the battery pack at the end of charging is determined 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 end of charging.

2. The method according to claim 1, characterized in that The determining a first remaining power difference value of the battery pack at the charging start time 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 start time includes: Determine, according to a conversion relationship between the battery 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; A first remaining power difference value of the battery pack at the charging start time is determined according to the difference between the first remaining power and the second remaining power.

3. The method according to claim 1, characterized in that The determining, based on 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 end, a second remaining power difference value of the battery pack at the charging terminal end includes: Determine, according to a conversion relationship between the battery cell voltage and the remaining power, a third remaining power corresponding to the second maximum voltage signal and a fourth remaining power corresponding to the second minimum voltage signal; A second remaining power difference value of the battery pack at the end of charging is determined according to the difference between the third remaining power and the fourth remaining power.

4. The method according to any one of claims 1 to 3, characterized in that The analyzing the capacity consistency of the battery pack according to the first remaining power difference value and the second remaining power difference value includes: If the first remaining power difference value is smaller than a power difference threshold, and the second remaining power difference value is smaller than the power difference threshold, it is determined that the cell capacities of the battery packs are consistent.

5. The method according to any one of claims 1 to 3, characterized in that The analyzing the capacity consistency of the battery pack according to the first remaining power difference value and the second remaining power difference value includes: If the first remaining power difference value is less than a power difference threshold, and the second remaining power difference value is greater than or equal to the power difference threshold, determining that the cell capacities of the battery pack are inconsistent; If the first remaining power difference value is greater than or equal to the power difference threshold, and the second remaining power difference value is less than the power difference threshold, it is determined that the cell capacities of the battery pack are inconsistent.

6. The method according to any one of claims 1 to 3, characterized in that The analyzing the capacity consistency of the battery pack according to the first remaining power difference value and the second remaining power difference value includes: If the first remaining power difference value is greater than a power difference threshold, and the second remaining power difference value is greater than the power difference threshold, it is determined that the battery group is insufficiently balanced.

7. The method according to claim 4, characterized in that The method further comprises: When the cell capacities of the battery packs are consistent and the capacity of the battery pack is insufficient, a prompt message for replacing the battery pack is generated.

8. The method according to claim 5, characterized in that The method further comprises: When the cell capacities of the battery pack are inconsistent and the capacity of the battery pack is insufficient, obtaining a cell box number in the battery pack corresponding to the first maximum voltage signal or the second maximum voltage signal; Generate a prompt message for replacing the electrical box corresponding to the electrical box number.

9. The method according to claim 6, characterized in that The method further comprises: When the battery pack capacity is insufficient and the balancing is insufficient, a prompt message for updating the balancing control of the battery pack is generated.

10. The method according to claim 1, characterized in that Before obtaining the first voltage signals of at least two cells of the battery pack at the start of charging and the second voltage signals of at least two cells of the battery pack at the end of charging, the method further includes: Acquiring charging condition data of the battery pack; the charging condition data includes the remaining power and the end voltage of the battery pack; If the remaining power is within the preset power variation range and the end voltage is greater than the preset voltage, the step of obtaining the first voltage signal of at least two battery cells of the battery pack at the start of charging and the second voltage signal of at least two battery cells of the battery pack at the end of charging is executed.

11. A device for analyzing battery capacity consistency using the method according to claim 1, characterized in that: The device comprises: a signal acquisition module, configured to acquire first voltage signals of at least two cells of the battery pack at the start of charging, and second voltage signals of at least two cells of the battery pack at the end of charging; a power difference determining module, configured to determine a first remaining power difference value of the battery pack at the start of charging based on the first voltage signals of the at least two battery cells, and to determine a second remaining power difference value of the battery pack at the end of charging based on the second voltage signals of the at least two battery cells; The consistency analysis module is configured to analyze the capacity consistency of the battery pack according to the first remaining power difference value and the second remaining power difference value.

12. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 10 are implemented.

13. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

14. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 10 are implemented.

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