Battery diagnostic device and method thereof

Abstract

A battery diagnostic device according to an embodiment of the present document can include a memory in which at least one instruction is stored, and a processor for executing the at least one instruction, wherein the processor acquires incremental capacity data based on charging and discharging data of a plurality of battery cells, identifies reference incremental capacity values corresponding to voltages of the plurality of battery cells by using the incremental capacity data for the plurality of corresponding battery cells, and acquires a target voltage for diagnosing a state of the battery cells by using the reference incremental capacity values.

Description

Technical Field

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2024-0095951, filed on July 19, 2024, the disclosure of which is incorporated herein by reference. Technical Field

[0003] The embodiments disclosed in this document relate to battery diagnostic devices and battery diagnostic methods. Background Technology

[0004] Recently, research and development on rechargeable batteries have been actively pursued. Here, a rechargeable battery is a battery that can be charged and discharged, and can be interpreted as including conventional Ni / Cd batteries, Ni / MH batteries, and more recently, lithium-ion batteries. Recently, the applications of rechargeable batteries have expanded to include power sources for electric vehicles, and they are attracting attention as a next-generation energy storage medium.

[0005] After the activation process of the battery cells is completed, the battery cells can be classified into normal cells and defective cells based on whether they can output a specified voltage. Typically, to diagnose a battery cell, the self-discharge level is calculated based on the open-circuit voltage (OCV) or the internal leakage current is measured. However, this method is time-consuming and costly because voltage changes are measured after the battery cell has been stored for a relatively long period. Summary of the Invention

[0006] Technical issues

[0007] The embodiment provides a battery diagnostic device and a battery diagnostic method that use incremental capacity data of multiple battery cells to obtain a target voltage for diagnosing the battery cells.

[0008] An embodiment provides a battery diagnostic device and a battery diagnostic method. The battery diagnostic device and the battery diagnostic method group multiple battery cells, obtain a first reference incremental capacity value and a second reference incremental capacity value, and use the obtained first reference incremental capacity value and second reference incremental capacity value to obtain a target voltage for diagnosing the battery cells.

[0009] The embodiment provides a battery diagnostic device and a battery diagnostic method, which use charging and discharging data of multiple battery cells to obtain a target voltage for diagnosing the battery cells.

[0010] The technical problems of the embodiments disclosed in this document are not limited to the above-described technical problems, and other technical problems not mentioned can be clearly understood by those skilled in the art based on the following description.

[0011] Technical solution

[0012] A battery diagnostic device according to an embodiment of this document includes a memory configured to store at least one instruction and a processor configured to execute at least one instruction, wherein the processor is configured to: acquire incremental capacity data based on charging and discharging data of a plurality of battery cells; use the incremental capacity data to identify a reference incremental capacity value of the plurality of battery cells corresponding to the voltage of each of the plurality of battery cells; and use the reference incremental capacity value to acquire a target voltage for diagnosing the state of the battery cells.

[0013] In an implementation, the processor can be configured to: identify each of the voltages by dividing a specified voltage range into specified voltage values; identify first reference incremental capacity values ​​corresponding to voltages for a first portion of a plurality of battery cells in the reference incremental capacity values; and identify second reference incremental capacity values ​​corresponding to voltages for a second portion of a plurality of battery cells in the reference incremental capacity values.

[0014] In an implementation, the first reference incremental capacity value may include representative values ​​of incremental capacity values ​​corresponding to voltage detected from the first part, and the second reference incremental capacity value may include representative values ​​of incremental capacity values ​​corresponding to voltage detected from the second part.

[0015] In one implementation, the processor can be configured to obtain a target voltage from the voltage based on the difference between a first reference increment capacity value and a second reference increment capacity value.

[0016] In one implementation, the processor can be configured to identify the absolute value of the difference and the voltage corresponding to the reference voltage as the target voltage.

[0017] In an implementation, the reference voltage may include the voltage with the largest absolute value among the absolute values ​​of the differences.

[0018] In one implementation, the processor can be configured to acquire the target voltage based on a sequential arrangement of differences.

[0019] In one implementation, the processor can be configured to acquire charging and discharging data based on performing specified procedures on the battery pack.

[0020] The battery diagnostic method according to the embodiments of this document includes: an operation by which a processor acquires incremental capacity data based on charging and discharging data of a plurality of battery cells; an operation by which the processor uses the incremental capacity data to identify a reference incremental capacity value corresponding to the voltage of each of the plurality of battery cells; and an operation by which the processor uses the reference incremental capacity value to acquire a target voltage for diagnosing the state of the battery cells.

[0021] The battery diagnostic method according to the embodiments may include: an operation of identifying each of the voltages by dividing a specified voltage range into specified voltage magnitudes; an operation of identifying first reference incremental capacity values ​​corresponding to voltages for a first portion of a plurality of battery cells in a plurality of reference incremental capacity values; and an operation of identifying second reference incremental capacity values ​​corresponding to voltages for a second portion of a plurality of battery cells in a plurality of reference incremental capacity values.

[0022] In an implementation, the first reference incremental capacity value may include representative values ​​of incremental capacity values ​​corresponding to voltage detected from the first part, and the second reference incremental capacity value may include representative values ​​of incremental capacity values ​​corresponding to voltage detected from the second part.

[0023] The battery diagnostic method according to the embodiments may include the operation of obtaining a target voltage from the voltage based on the difference between a first reference incremental capacity value and a second reference incremental capacity value.

[0024] The battery diagnostic method according to the embodiments may include the operation of identifying the absolute value of the difference with the voltage corresponding to the reference voltage as the target voltage.

[0025] In an implementation, the reference voltage may include the voltage with the largest absolute value among the absolute values ​​of the differences.

[0026] The battery diagnostic method according to the embodiments may include operations that obtain a target voltage based on sequentially arranged differences.

[0027] Beneficial effects

[0028] This technology can use incremental capacity data from multiple battery cells to obtain a target voltage for diagnosing battery cells.

[0029] In addition, this technology can group multiple battery cells, obtain a first reference incremental capacity value and a second reference incremental capacity value, and use the obtained first reference incremental capacity value and second reference incremental capacity value to obtain a target voltage for diagnosing the battery cells.

[0030] In addition, this technology can use charging and discharging data from multiple battery cells to obtain target voltages for diagnosing battery cells.

[0031] In addition, various effects that can be directly or indirectly identified through this document can be provided. Attached Figure Description

[0032] Figure 1 This is a block diagram illustrating a battery pack in a battery diagnostic apparatus and battery diagnostic method according to an embodiment of this document.

[0033] Figure 2 An example block diagram illustrating the configuration of a battery diagnostic device according to an embodiment of this document is shown.

[0034] Figure 3 An example of using incremental capacity data to obtain a target voltage according to an implementation of this document is shown.

[0035] Figure 4 An example of a graph relating incremental capacity data of battery cells according to an embodiment of this document is shown.

[0036] Figure 5 An example of a box plot showing the relationship between the voltage of a battery cell and an embodiment of this document is shown.

[0037] Figure 6 An example flowchart related to a battery diagnostic method according to an embodiment of this document is shown.

[0038] Figure 7 This is a block diagram illustrating the hardware configuration of a computing system that performs a battery diagnostic method in a battery diagnostic device and battery diagnostic method according to an embodiment of this document. Detailed Implementation

[0039] In the following description, some embodiments described in this document will be described with reference to the accompanying drawings. However, this is not intended to limit the technology to specific embodiments, but should be understood to include various modifications, equivalents, and / or substitutions of the embodiments of the technology.

[0040] When adding reference numerals to components in each drawing, it should be noted that the same reference numerals should be given to the same components whenever possible, even if the same components are shown in different drawings. Furthermore, when describing the various embodiments disclosed in this document, detailed descriptions of known configurations or functions that hinder the understanding of embodiments of this disclosure are omitted. Unless the relevant context clearly indicates otherwise, the singular form of the noun corresponding to an item may include one or more items.

[0041] In describing the components of the embodiments described in this document, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended only to distinguish these components from others, and the nature, order, or sequence of these components is not limited by these terms. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments disclosed herein pertain. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as they have in the context of the relevant art and should not be interpreted as having an ideal or overly formal meaning unless expressly defined in this application.

[0042] Furthermore, in this disclosure, the expressions "greater than" or "less than" may be used to determine whether a specific condition is met or satisfied. However, this is merely a description for illustrative purposes and does not exclude descriptions of "greater than or equal to" or "less than or equal to". A condition described as "greater than or equal to" may be replaced with "greater than", a condition described as "less than or equal to" may be replaced with "less than", and a condition described as "greater than or equal to and less than" may be replaced with "greater than and less than or equal to". Additionally, in the following text, "A" to "B" means at least one of the elements from A (inclusive) to B (inclusive).

[0043] In this document, each of the phrases “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C”, and “at least one of A, B or C” can include any one of the items listed together in the corresponding phrase or all possible combinations thereof.

[0044] In this document, when a component (e.g., a first component) is referred to as “connected,” “joined,” or “engaged” to another component (e.g., a second component) with or without the terms “functionally” or “communically”, it means that the component can be connected to the other component directly (e.g., via a wired connection), wirelessly, or via a third component.

[0045] Methods according to the various embodiments disclosed in this document can be provided by including them in a computer program product. The computer program product can be traded as a product between a seller and a buyer. The computer program product can be distributed in the form of a machine-readable recording medium (e.g., an optical disc read-only memory (CD-ROM)), or distributed through an app store, directly between two user devices, or distributed online (e.g., downloaded or uploaded). In the case of online distribution, at least a portion of the computer program product can be temporarily stored or temporarily generated in a machine-readable recording medium (such as the memory of a manufacturer's server, an app store's server, or a relay server).

[0046] According to various embodiments, each of the above-described components (e.g., modules or programs) may include one or more entities, and some of the entities may be separated and placed in other components. According to various embodiments, one or more of the above-described components or operations may be omitted, or one or more other components or operations may be added. Alternatively or additionally, multiple components (e.g., modules or programs) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the multiple components, functions that are the same as or similar to those performed by the corresponding components among the multiple components prior to integration. According to various embodiments, operations performed by modules, programs, or other components may be performed sequentially, in parallel, repeatedly, or heuristically, or one or more operations may be performed in a different order, omitted, or performed by adding one or more other operations.

[0047] In the following text, reference will be made to Figures 1 to 7 The implementation method of this document is described in detail.

[0048] Figure 1 This is a block diagram illustrating a battery pack in a battery diagnostic apparatus and battery diagnostic method according to an embodiment of this document.

[0049] Reference Figure 1 The battery pack 1 may include battery cells 12, sensor units 14, switching units 16, and a battery management system (BMS) 20. In this case, the battery pack 1 may be equipped with multiple battery cells 12, sensor units 14, switching units 16, and battery management systems 20.

[0050] According to an embodiment, battery cell 12 can supply power to a target device (not shown). For this purpose, battery cell 12 can be electrically connected to the target device. Here, the target device can include electrical, electronic, or mechanical devices that operate by receiving power from battery pack 1. For example, the target device can be, but is not limited to, an electric vehicle (EV).

[0051] According to an embodiment, the battery cell 12 may include at least one rechargeable and dischargeable battery cell 10. Here, the battery cell 10 may be a basic unit of a battery cell that can be used by charging and discharging electrical energy. For example, the battery cell 10 may be a lithium-ion (Li-ion) battery, a lithium-ion polymer battery, a nickel-cadmium (Ni-Cd) battery, a nickel metal hydride (Ni-MH) battery, etc., but is not limited thereto.

[0052] According to the implementation method, multiple battery cells 12 can be connected in series or in parallel. For example, battery cell 12 can be a battery module, a battery pack, or a collection of battery cells (cell-to-pack structure).

[0053] According to one embodiment, sensor unit 14 can acquire information related to battery cell 12. According to another embodiment, sensor unit 14 can acquire values ​​(or information) related to the state of each of battery cell 12 or battery cell 10. In one embodiment, the state-related values ​​may include one or more values, or combinations thereof, of the battery cell's voltage, current, resistance, state of charge (SOC), state of health (SOH), or temperature.

[0054] According to an implementation, the sensor unit 14 can provide the battery management system 20 with information relating to each of the plurality of battery cells 12.

[0055] According to an embodiment, the switching unit 16 may include means for controlling the current for charging or discharging the battery cell 12. For example, the switching unit 16 may include at least one relay and / or magnetic contactor, depending on the specifications of the battery pack 1.

[0056] According to the embodiment, the battery management system (BMS) 20 can control or manage the battery pack 1 to prevent overcharging and over-discharging by monitoring the voltage, current, temperature, etc. of the battery pack 1. For example, the battery management system 20 is an interface that receives values ​​obtained by measuring the various parameters mentioned above, and may include multiple terminals, circuitry connected to these terminals to process the received values, etc. In addition, the battery management system 20 can control the sensor unit 14 and / or the switching unit 16. For example, the battery management system 20 can be connected to multiple battery cells, including battery cell 12, to monitor the state of each of the multiple battery cells 12 and control the on / off state of relays or contactors, etc.

[0057] According to the implementation, the operation of the battery management system 20 can be performed by the battery management system (BMS) in the vehicle, and can also be performed in various devices such as servers, cloud, chargers, or chargers / dischargers.

[0058] The upper-level controller 2 can send control signals for the multiple battery cells 12 to the battery management system 20. Therefore, the operation of the battery management system 20 can be controlled based on the signals applied from the upper-level controller 2.

[0059] According to an implementation, the battery management system 20 may include Figure 2 The battery diagnostic device 200. According to another embodiment, the battery management system 20 can be integrated with... Figure 2 The battery diagnostic device has 200 different systems. That is to say, Figure 2 The battery diagnostic device 200 can be included in the battery pack 1, or it can be configured as another device outside the battery pack 1. For ease of description, the following description will assume that the battery diagnostic device 200 is composed of other devices outside the battery pack 1. Furthermore, the operation of the battery diagnostic device 200 described below can be performed by the vehicle's BMS, and can also be performed by various devices such as servers, cloud computing, chargers, or dischargers.

[0060] Figure 2 This is an example of a block diagram illustrating the configuration of a battery diagnostic device according to an embodiment of this document.

[0061] Reference Figure 2 The battery diagnostic device 200 according to the embodiment may include a processor 210 and a memory 220. The processor 210 and the memory 220 may be electrically connected and / or operatively connected to each other via electronic components including a communication bus.

[0062] In the following text, operatively linking hardware blocks together may include direct and / or indirect connections between hardware blocks established in a wired and / or wireless manner, such that a second hardware block is controlled by a first hardware block.

[0063] Although hardware blocks are shown in different boxes, the implementation is not limited to this. For example, Figure 2 Some hardware blocks can be included in a single integrated circuit, including a system-on-a-chip (SoC). The type and / or number of hardware blocks included in the battery diagnostic device 200 are not limited to... Figure 2 The type and quantity shown. For example, the battery diagnostic device 200 may include only... Figure 2 Some of the hardware blocks shown.

[0064] The battery diagnostic device 200 according to an embodiment may include hardware for processing data based on one or more instructions. The hardware for processing data may include a processor 210. For example, the hardware for processing data may include an arithmetic and logic unit (ALU), a floating-point unit (FPU), a field-programmable gate array (FPGA), a central processing unit (CPU), and / or an application processor (AP).

[0065] For example, processor 210 may have a single-core processor architecture or a multi-core processor architecture with dual-core, quad-core, hexa-core, or octa-core.

[0066] The memory 220 of the battery diagnostic device 200 according to the embodiment may include hardware components for storing data and / or instructions input to the processor 210 of the battery diagnostic device 200 and output from the processor 210 of the battery diagnostic device 200.

[0067] For example, memory 220 may include volatile memory (including random access memory (RAM)) and / or non-volatile memory (including read-only memory (ROM)).

[0068] For example, volatile memory may include at least one of dynamic RAM (DRAM), static RAM (SRAM), cache memory, pseudo SRAM (PSRAM), or any combination thereof.

[0069] For example, non-volatile memory may include at least one of programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), flash memory, hard disk, compact disk, solid-state drive (SSD), embedded multimedia card (eMMC), or any combination thereof.

[0070] For example, at least one instruction (or command) indicating the operation and / or action to be performed on the data by the processor 210 of the battery diagnostic device 200 can be stored in the memory 220 of the battery diagnostic device 200.

[0071] For example, a set of at least one instruction can be referred to as a program, firmware, operating system, process, routine, subroutine, and / or application. In the following, installing an application in the battery diagnostic device 200 may mean that at least one instruction provided in the form of an application is stored in memory 220, and that the application is stored in an executable format (e.g., a file with an extension specified by the processor 210 of the battery diagnostic device 200 through the operating system of the battery diagnostic device 200).

[0072] The battery diagnostic device 200 according to the embodiment may include a processor 210 that executes at least one instruction and a memory 220 that stores at least one instruction.

[0073] In this implementation, the processor 210 can acquire charging and discharging data of multiple battery cells, including battery cells 10 included in the battery pack 1 and / or battery unit 12. For example, the processor 210 can acquire incremental capacity data based on acquiring the charging and discharging data of multiple battery cells included in the battery pack. Hereinafter, multiple battery cells can be understood as including... Figure 1 The battery cell 10. Additionally, the battery pack 1 below may include battery cells 12.

[0074] For example, charging and discharging data may include at least one of the following: the voltage of battery pack 1, the current of battery pack 1, time, the capacity of battery pack 1, or any combination thereof. Similarly, charging and discharging data may include at least one of the following: the voltage of battery cell 10, the current of battery cell 10, time, the capacity of battery cell 10, or any combination thereof.

[0075] For example, processor 210 can acquire incremental capacity data based on preprocessing of charging and discharging data of multiple battery cells included in battery pack 1. For example, preprocessing may include using the charging and discharging data to acquire incremental capacity data. For example, preprocessing may include extracting features from the charging and discharging data.

[0076] For example, processor 210 can acquire charging and discharging data based on performing specified procedures on battery pack 1. For example, the specified procedures may include procedures performed by battery diagnostic device 200 or external electronic devices different from battery diagnostic device 200. For example, charging and discharging data can be acquired based on performing charging and discharging on battery pack 1. For example, charging and discharging data can be acquired based on performing charging and discharging on battery cell 10. For example, charging and discharging data can be acquired based on performing charging and discharging on battery cell 12.

[0077] For example, the specified process may include an activation process. For example, the activation process may include a first operation of aging the battery, a second operation of charging and discharging the battery, and a third operation of degassing to remove internal gases from the battery. For example, the activation process may include a process of repeatedly performing the first, second, and third operations.

[0078] In one implementation, the processor 210 can identify reference incremental capacity values ​​corresponding to multiple battery cells based on incremental capacity data.

[0079] For example, processor 210 can divide a specified voltage range into specified voltage magnitudes. For example, processor 210 can identify the voltage of each of a plurality of battery cells. For example, processor 210 can identify the voltage of each of the plurality of battery cells based on dividing a specified voltage range into specified voltage magnitudes.

[0080] For example, processor 210 can identify a first reference incremental capacity value corresponding to the voltage of each of the plurality of battery cells in a first portion of the plurality of battery cells. For example, the first portion of the plurality of battery cells may include a defective cell. For example, a defective cell may include a battery cell having a relatively lower voltage than a normal cell, as will be described below. For example, a defective cell may include a battery cell capable of outputting a voltage lower than a specified range. For example, a defective cell may include a battery cell capable of outputting a voltage in a range different from the specified range. For example, a defective cell may include a battery cell capable of outputting a voltage outside the specified range. For example, a defective cell may include a battery cell capable of outputting a voltage lower than the minimum voltage within the specified range.

[0081] For example, the first reference incremental capacity value may include a representative value of the incremental capacity value corresponding to the voltage of each of the multiple battery cells detected from a first portion of the multiple battery cells.

[0082] For example, processor 210 can identify a second reference incremental capacity value corresponding to the voltage of each of the multiple battery cells in a second portion of a plurality of reference incremental capacity values. For example, the second portion of the multiple battery cells may include a normal cell. For example, a normal cell may include a battery cell capable of outputting a voltage within a specified range. For example, a normal cell may include a battery cell capable of outputting a voltage within a specified range.

[0083] For example, the second reference incremental capacity value may include a representative value of the incremental capacity value corresponding to the voltage of each of the multiple battery cells detected from a second portion of the multiple battery cells.

[0084] The representative values ​​mentioned above may include at least one of the following: average, median, arithmetic mean, geometric mean, harmonic mean, weighted average, median, modulus, maximum, minimum, quartile, or combinations thereof. However, examples of representative values ​​are not limited to those listed above. In the following text, for ease of description, representative values ​​will be described as averages instead of representative values.

[0085] In one implementation, the processor 210 can obtain a target voltage for diagnosing the state of at least one of the battery pack 1, battery cell 12, battery cell 10, or any combination thereof, based on a reference incremental capacity value.

[0086] For example, processor 210 can obtain a target voltage from the voltages of multiple battery cells. For example, processor 210 can obtain the target voltage from the voltages of multiple battery cells based on the difference between a first reference incremental capacity value and a second reference incremental capacity value.

[0087] For example, processor 210 can identify the absolute value of the difference between the first reference increment capacity value and the second reference increment capacity value.

[0088] For example, processor 210 can identify whether the absolute value of the difference between the first reference increment capacity value and the second reference increment capacity value corresponds to a reference voltage. For example, processor 210 can identify whether the absolute value of the difference between the first reference increment capacity value and the second reference increment capacity value corresponds to a voltage corresponding to the reference voltage. For example, processor 210 can identify the absolute value of the difference between the first reference increment capacity value and the second reference increment capacity value corresponding to a voltage corresponding to the reference voltage as the target voltage.

[0089] For example, the reference voltage may include the voltage with the largest absolute value among the absolute values ​​of the differences between the first reference increment capacity value and the second reference increment capacity value.

[0090] For example, processor 210 can sequentially arrange the differences between the first reference increment capacity value and the second reference increment capacity value. For example, processor 210 can obtain the target voltage based on the sequential arrangement of the differences between the first reference increment capacity value and the second reference increment capacity value.

[0091] For example, the processor 210 can identify the voltage with the largest difference between the first reference increment capacity value and the second reference increment capacity value by sequentially arranging the differences between the first reference increment capacity value and the second reference increment capacity value, thereby obtaining the target voltage.

[0092] In one implementation, the processor 210 may identify a target range that includes a target voltage. For example, the target range may include voltages used for diagnosing battery cells. For example, the target range may include voltage ranges used to determine whether each of the battery cells is a normal cell or a defective cell.

[0093] According to one embodiment, the battery diagnostic device 200 can use a target voltage to diagnose the battery cell 10. However, this embodiment is not limited to this. For example, an external electronic device, different from the battery diagnostic device 200, can use the target voltage to diagnose the battery cell. For example, the battery diagnostic device 200 can provide the target voltage to the external electronic device. For example, in order for the external electronic device to use the target voltage to diagnose the battery cell, the battery diagnostic device 200 can send data (or information) including the target voltage to the external electronic device via a communication circuit.

[0094] For example, a battery cell 10 that outputs a voltage lower than the target voltage may be a defective cell, while a battery cell 10 that outputs a voltage higher than the target voltage may be a normal cell.

[0095] For example, the battery diagnostic device 200 can diagnose a battery cell 10 with a voltage lower than the target voltage as a defective cell. Conversely, the battery diagnostic device 200 can diagnose a battery cell 10 with a voltage higher than the target voltage as a normal cell.

[0096] As described above, the battery diagnostic device 200 according to the embodiment can obtain a target voltage for diagnosing the battery cell 10 based on the incremental capacity data of the battery pack 1. The battery diagnostic device 200 and / or external electronic devices can accurately diagnose whether the battery cell 10 is a normal cell or a defective cell by using the target voltage to diagnose the battery cell 10.

[0097] Figure 3 An example of using incremental capacity data to obtain a target voltage according to an implementation of this document is shown.

[0098] Reference Figure 3 According to the embodiment, the processor 210 of the battery diagnostic device 200 can acquire a graph 300 including incremental capacity data.

[0099] For example, processor 210 can obtain a graph 300 including incremental capacity data based on charging and discharging data of multiple battery cells. For example, processor 210 can use the incremental capacity data to identify reference incremental capacity values ​​corresponding to the voltages of the multiple battery cells.

[0100] For example, the processor 210 can obtain a first reference incremental capacity value 301 for a first portion of a plurality of battery cells in the reference incremental capacity value, each corresponding to the voltage of the plurality of battery cells.

[0101] For example, the processor 210 can obtain a second reference incremental capacity value 303 for the second portion of a plurality of battery cells in the reference incremental capacity value, which corresponds to the voltage of the plurality of battery cells respectively.

[0102] For example, the first part may include defective battery cells. For example, the second part may include normal battery cells.

[0103] For example, processor 210 can identify the difference between the first reference increment capacity value 301 and the second reference increment capacity value 303. For example, processor 210 can identify the absolute value of the difference between the first reference increment capacity value 301 and the second reference increment capacity value 303.

[0104] For example, processor 210 can identify the voltage with the largest absolute value among the absolute values ​​of the differences between the first reference increment capacity value 301 and the second reference increment capacity value 303. For example, processor 210 can identify the voltage with the largest absolute value among the absolute values ​​of the differences between the first reference increment capacity value 301 and the second reference increment capacity value 303 as the target voltage 305.

[0105] For example, the battery diagnostic device 200 can diagnose the battery pack 1, battery cell 10, and / or battery unit 12 based on the target voltage 305 identified using the graph 300 and / or incremental capacity data.

[0106] Figure 4 An example graph is shown that relates to incremental capacity data of battery cells in the embodiments of this document.

[0107] Reference Figure 4 According to the embodiments, the battery diagnostic device 200 and / or the external electronic device for diagnosing the battery cell 10 can be used via... Figures 1 to 3 The target voltage is obtained to diagnose battery cell 10.

[0108] For example, the battery diagnostic device 200 and / or external electronic device can obtain the graph 400 based on the diagnosis of the battery cells. For example, in the graph 400, a first result value 401 may include an incremental capacity value obtained from a defective cell. For example, a second result value 403 may include an incremental capacity value obtained from a normal cell.

[0109] By referring to graph 400, the difference between the average and / or median value of the first result value 401 and the average and / or median value of the second result value 403 can be confirmed. Battery diagnostic device 200 and / or external electronic devices can distinguish normal cells from defective cells by diagnosing the battery cell 10 using a target voltage, as shown in graph 400.

[0110] Figure 5 An example of a box plot showing the relationship between the voltage of a battery cell according to an embodiment of this document is shown.

[0111] Reference Figure 5 The battery diagnostic device 200 and / or the external electronic device for diagnosing the battery cell 10 can obtain a graph 500 based on the diagnosis of the battery cell 10 using the target voltage.

[0112] For example, graph 500 could be an example of a box plot representing a battery cell. In graph 500, a first result 501 could include an example of a box plot representing a normal cell. In graph 500, a second result 503 could include an example of a box plot representing a defective cell.

[0113] By examining graph 500, it can be confirmed that the first quartile of the first result 501 and the first quartile of the second result 503 do not overlap. Similarly, by examining graph 500, it can be confirmed that the second quartile of the first result 501 and the second quartile of the second result 503 do not overlap. Finally, by examining graph 500, it can be confirmed that the third quartile of the first result 501 and the third quartile of the second result do not overlap.

[0114] According to the embodiments, the battery diagnostic device 200 and / or external electronic device can clearly distinguish between normal cells and defective cells by using a target voltage to diagnose the battery cell 10, as shown in the graph 500.

[0115] Figure 6 An example flowchart related to the battery diagnostic method according to an embodiment of this document is shown.

[0116] In the following text, it is assumed that... Figure 2 Battery diagnostic device 200 performs Figure 6 The process. Additionally, in Figure 6 In the description, the operations described as being performed by the device can be understood as being controlled by the processor 210 of the battery diagnostic device 200.

[0117] Figure 6 At least one of the operations can be performed by Figure 2 The battery diagnostic device 200 is executed. Figure 6 At least one of the operations can be performed by Figure 2 The processor 210 controls it. Figure 6 Each of the operations can be executed sequentially, but not necessarily in order. For example, the order of each operation can be changed, and at least two operations can be executed in parallel.

[0118] Reference Figure 6 In operation S601, the battery diagnostic method according to the embodiment may include an operation of acquiring incremental capacity data based on charging and discharging data of a plurality of battery cells included in the battery pack 1.

[0119] For example, a battery diagnostic method may include the operation of acquiring incremental capacity data based on charging and discharging data of battery cells 10 included in at least one of battery pack 1, battery cell 12, or any combination thereof.

[0120] For example, a battery diagnostic method may include operations based on performing specified procedures on battery pack 1 to obtain charging and discharging data.

[0121] In operation S603, the battery diagnostic method according to the embodiment may include an operation of using incremental capacity data to identify reference incremental capacity values ​​corresponding to the voltages of multiple battery cells.

[0122] For example, a battery diagnostic method may include operations that identify the voltage of each of a plurality of battery cells based on dividing a specified voltage range into specified voltage magnitudes.

[0123] For example, a battery diagnostic method may include the operation of identifying a first reference incremental capacity value for a first portion of a plurality of battery cells among a plurality of battery cells, corresponding to a first reference incremental capacity value for each of the voltages of the plurality of battery cells.

[0124] For example, a battery diagnostic method may include the operation of identifying a second reference incremental capacity value for a second portion of a plurality of battery cells among a plurality of battery cells, corresponding to a second reference incremental capacity value for each of the voltages of the plurality of battery cells.

[0125] For example, the first reference incremental capacity value may include the average of the incremental capacity values ​​detected from the first part, each corresponding to the voltage of a plurality of battery cells.

[0126] For example, the second reference incremental capacity value may include the average of the incremental capacity values ​​corresponding to the voltages of each of the plurality of battery cells detected from the second part.

[0127] In operation S605, the battery diagnostic method according to the embodiment may include the operation of using a reference incremental capacity value to obtain a target voltage for diagnosing the state of the battery cell 10.

[0128] For example, a battery diagnostic method may include using a reference incremental capacity value to obtain a target voltage for diagnosing the state of at least one of the battery pack 1, battery cell 12, battery cell 10, or any combination thereof.

[0129] For example, a battery diagnostic method may include obtaining a target voltage among multiple battery cells based on the difference between a first reference incremental capacity value and a second reference incremental capacity value.

[0130] For example, a battery diagnostic method may include identifying the absolute value of the difference between a first reference incremental capacity value and a second reference incremental capacity value, along with the voltage corresponding to a reference voltage, as the target voltage.

[0131] For example, the reference voltage may include the voltage with the largest absolute value among the differences between the first reference increment capacity value and the second reference increment capacity value. Alternatively, the reference voltage may include a voltage whose absolute value corresponds to the maximum value.

[0132] For example, a battery diagnostic method may include obtaining a target voltage based on the difference between a first reference incremental capacity value and a second reference incremental capacity value arranged sequentially.

[0133] This document describes how the battery diagnostic device 200 and / or battery diagnostic method acquires a target voltage for diagnosing the state of the battery pack 1, battery cell 12, and / or battery cell 10; however, the implementation is not limited thereto. For example, the battery diagnostic device 200 and / or battery diagnostic method can diagnose the state of battery packs, battery cells, and / or battery cells different from those of battery pack 1, battery cell 12, and / or battery cell 10 based on the acquisition of the target voltage.

[0134] Figure 7 This is a block diagram illustrating the hardware configuration of a computing system that performs a battery diagnostic method in a battery diagnostic device and battery diagnostic method according to an embodiment of this document.

[0135] Reference Figure 7 The computing system 1100 according to the embodiments disclosed in this document may include an MCU 1110, a memory 1120, an input / output I / F 1130 and a communication I / F 1140.

[0136] MCU 1110 can execute various programs stored in memory 1120 (e.g., battery cell data collection program, graphics generation program, data analysis program, data decomposition algorithm, normalization program, and battery cell diagnostic program, etc.), process various information including battery cell characteristic data, potential variables, etc., through these programs, and execute the aforementioned... Figures 1 to 7 The processor of the battery diagnostic device 200 shown has the following functions.

[0137] The memory 1120 can store various programs, such as battery cell data collection programs, graphics generation programs, data analysis programs, data decomposition algorithms, normalization programs, and battery cell diagnostic programs.

[0138] Multiple such memories 1120 can be provided as needed. Memory 1120 can be volatile or non-volatile memory. Memory 1120 used as volatile memory can be RAM, DRAM, SRAM, etc. Memory 1120 used as non-volatile memory can be ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. The examples of memories 1120 listed above are merely examples, but are not limited to these examples.

[0139] The input / output I / F 1130 can provide an interface that allows data to be sent and received by connecting input devices (not shown), such as a keyboard, mouse, or touch panel, and output devices (not shown), such as a display, to the MCU 1110.

[0140] The communication I / F 1140 is configured to send and receive various data with a server, and can be various devices capable of supporting wired or wireless communication. For example, the battery diagnostic device 200 can send various information, including the shape model of the battery cell, to a separately provided external server and receive various information, including the shape model of the battery cell, from the separately provided external server via the communication I / F 1140.

[0141] In this way, a computer program according to the embodiments disclosed in this document can be implemented to execute, for example, by being recorded in memory 1120 and processed by MCU 1110. Figure 2 The module for each function shown.

[0142] In the foregoing, even though all components constituting the embodiments disclosed in this document have been described as operating in combination or in combination, the embodiments disclosed in this document are not necessarily limited to such embodiments. That is, within the scope of the purpose of the embodiments disclosed in this document, all components may be selectively combined and operated in one or more combinations.

[0143] Furthermore, unless specifically stated to the contrary, the terms "comprising," "configured," or "having" as described above mean that the corresponding component may be included, and therefore should be interpreted as capable of further including, rather than excluding, other components. Unless otherwise defined, all terms, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments disclosed in this document pertain. Commonly used terms (such as those defined in dictionaries) should be interpreted as consistent with the meaning in the context of the relevant art and should not be interpreted as having an idealized or overly formal meaning, unless expressly defined in this document.

[0144] The foregoing disclosure outlines features of several embodiments, enabling those skilled in the art to better understand various aspects of this disclosure. Those skilled in the art will understand that this disclosure can be readily used as a basis for designing or modifying different structures to perform the same purposes or achieve the same advantages of the embodiments described herein. Furthermore, those skilled in the art will recognize that such equivalent configurations do not depart from the scope of this disclosure, and that various changes, substitutions, and modifications can be made to this specification without departing from the scope of this disclosure.

Claims

1. A battery diagnostic device, the battery diagnostic device comprising: A memory configured to store at least one instruction; as well as A processor configured to execute the at least one instruction; The processor is configured as follows: Incremental capacity data is obtained based on the charging and discharging data of multiple battery cells; The incremental capacity data is used to identify a reference incremental capacity value for each of the plurality of battery cells, corresponding to the voltage of each of the plurality of battery cells. as well as The reference incremental capacity value is used to obtain the target voltage for diagnosing the state of the battery cell.

2. The battery diagnostic device according to claim 1, wherein, The processor is configured to: Each of the voltages is identified by dividing a specified voltage range into specified voltage magnitudes; Identify the first reference incremental capacity values ​​corresponding to the voltage for the first portion of the plurality of battery cells among the reference incremental capacity values; as well as Identify the second reference incremental capacity values ​​of the second portion of the plurality of battery cells among the reference incremental capacity values, each corresponding to the voltage.

3. The battery diagnostic device according to claim 2, wherein, The first reference incremental capacity value includes representative values ​​of the incremental capacity values ​​detected from the first portion, each corresponding to the voltage, and The second reference incremental capacity value includes representative values ​​of the incremental capacity values ​​detected from the second part, each corresponding to the voltage.

4. The battery diagnostic device according to claim 2, wherein, The processor is configured to obtain the target voltage from the voltage based on the difference between the first reference increment capacity value and the second reference increment capacity value.

5. The battery diagnostic device according to claim 4, wherein, The processor is configured to identify the absolute value of the difference and the voltage corresponding to the reference voltage as the target voltage.

6. The battery diagnostic device according to claim 5, wherein, The reference voltage includes the voltage with the largest absolute value among the absolute values ​​of the difference.

7. The battery diagnostic device according to claim 4, wherein, The processor is configured to acquire the target voltage based on a sequential arrangement of the differences.

8. The battery diagnostic device according to claim 1, wherein, The processor is configured to acquire the charging and discharging data based on performing specified procedures on the battery pack.

9. A battery diagnostic method, the battery diagnostic method comprising: The operation of obtaining incremental capacity data by the processor based on the charging and discharging data of multiple battery cells; The operation by which the processor uses the incremental capacity data to identify a reference incremental capacity value corresponding to the voltage of each of the plurality of battery cells; as well as The processor uses the reference incremental capacity value to obtain a target voltage for diagnosing the state of the battery cell.

10. The battery diagnostic method according to claim 9, further comprising: The operation of identifying each of the voltages by dividing a specified voltage range into specified voltage magnitudes; The operation of identifying the first reference incremental capacity value corresponding to the voltage of the first portion of the plurality of battery cells in the reference incremental capacity value; as well as The operation of identifying the second reference incremental capacity value of the second portion of the plurality of battery cells in the reference incremental capacity value, respectively, corresponding to the voltage.

11. The battery diagnostic method according to claim 10, wherein, The first reference incremental capacity value includes representative values ​​of the incremental capacity values ​​detected from the first portion, each corresponding to the voltage, and The second reference incremental capacity value includes representative values ​​of the incremental capacity values ​​detected from the second part, each corresponding to the voltage.

12. The battery diagnostic method according to claim 10, further comprising: The operation of obtaining the target voltage from the voltage based on the difference between the first reference incremental capacity value and the second reference incremental capacity value.

13. The battery diagnostic method according to claim 12, further comprising: The operation of identifying the absolute value of the difference and the voltage corresponding to the reference voltage as the target voltage.

14. The battery diagnostic method according to claim 13, wherein, The reference voltage includes the voltage with the largest absolute value among the absolute values ​​of the difference.

15. The battery diagnostic method according to claim 13, further comprising: The operation of obtaining the target voltage based on the sequential arrangement of the differences.

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