Battery diagnosis device and method therefor

Abstract

A battery diagnosis device according to one embodiment of the present document comprises: a memory for storing at least one instruction; and at least one processor for executing the at least one instruction, wherein the at least one processor can acquire a reference negative electrode data set of a reference negative electrode battery cell, acquire a reference positive electrode data set of a reference positive electrode battery cell, acquire cell data of a target battery cell, and diagnose the state of the target battery cell on the basis of the reference negative electrode data set, the reference positive electrode data set, and the cell data.

Description

Battery diagnostic device and method

[0001] Cross-citation with related applications

[0002] The present application claims the benefit of priority based on Korean Patent Application No. 10-2024-0152512 filed on October 31, 2024, and Korean Patent Application No. 10-2025-0098389 filed on July 21, 2025, and includes all contents disclosed in the documents of said patent applications as part of this specification.

[0003] Technology field

[0004] The embodiments disclosed in this document relate to a battery diagnostic device and a method thereof.

[0005] Recently, active research and development on secondary batteries has been underway. Here, secondary batteries are rechargeable batteries that can be interpreted to encompass conventional Ni / Cd and Ni / MH batteries, as well as recent lithium-ion batteries. With their scope of application expanding to include power sources for electric vehicles, they are garnering attention as a next-generation energy storage medium.

[0006] With the proliferation of various electronic devices due to the Fourth Industrial Revolution, battery usage is rapidly increasing. Batteries are gaining prominence as an essential energy source in various fields, such as electric vehicles, portable electronic devices, and renewable energy storage systems. Consequently, the importance of battery condition diagnostic technology to improve battery performance and reliability is growing.

[0007] In particular, technology is being developed to identify the temperature of each battery cell included in a battery unit. By identifying the temperature and resistance of each battery cell, the battery condition diagnostic performance of the battery diagnostic device can be improved. This enables the optimization of battery performance and ensures the quality stability of the battery cells by inspecting for abnormalities.

[0008] According to the embodiments disclosed in this document, a battery diagnostic device and a method for identifying the temperature of a negative electrode and the temperature of a positive electrode included in each of the battery cells are to be provided.

[0009] According to the embodiments disclosed in this document, a battery diagnostic device and a method for identifying the relative resistance of a negative electrode and the relative resistance of a positive electrode included in each of the battery cells are provided.

[0010] According to the embodiments disclosed in this document, a battery diagnostic device and a method are provided that specify the cause of an abnormality in a battery cell by identifying the temperature of the negative electrode and the temperature of the positive electrode included in each of the battery cells.

[0011] According to the embodiments disclosed in this document, a battery diagnostic device and a method are provided that specify the cause of an abnormality in a battery cell by identifying the relative resistance of the negative electrode and the relative resistance of the positive electrode included in each of the battery cells.

[0012] According to the embodiments disclosed in this document, the present invention aims to provide a battery diagnostic device and a method that improve the condition diagnostic performance of battery cells by identifying the temperature of the negative electrode and the temperature of the positive electrode included in each of the battery cells.

[0013] According to the embodiments disclosed in this document, the present invention aims to provide a battery diagnostic device and a method that improve the condition diagnostic performance of battery cells by identifying the relative resistance of the negative electrode and the relative resistance of the positive electrode included in each of the battery cells.

[0014] The technical problems of this document are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the descriptions below.

[0015] A battery diagnostic device according to one embodiment of the present document includes a memory for storing at least one instruction and at least one processor for executing said at least one instruction, wherein the at least one processor acquires a reference negative electrode data set of a reference negative electrode battery cell, acquires a reference positive electrode data set of a reference positive electrode battery cell, acquires cell data of a target battery cell, and, based on said reference negative electrode data set, said reference positive electrode data set, and said cell data, can identify the temperature of the negative electrode of the target battery cell at the time when said cell data is acquired and the temperature of the positive electrode of the target battery cell at the time when said cell data is acquired.

[0016] According to one embodiment, the at least one processor can identify a reference data set of a reference whole battery cell that is a full cell based on the reference negative electrode data set and the reference positive electrode data set, and identify the temperature of the negative electrode and the temperature of the positive electrode based on the reference data set and the cell data.

[0017] According to one embodiment, the at least one processor divides the cell data into a plurality of segments, identifies segment data that is included in at least a portion of the cell data and is included in any one of the plurality of segments, and can identify the temperature of the cathode and the temperature of the anode in any one of the segments based on the reference cathode data set, the reference anode data set, and the segment data.

[0018] According to one embodiment, the reference cathode data set includes a reference cathode data subset corresponding to each of a plurality of designated temperatures and a specific charge / discharge rate among a plurality of designated charge / discharge rates, and the anode data set includes a reference anode data subset corresponding to each of the plurality of designated temperatures and a specific charge / discharge rate among the plurality of designated charge / discharge rates, and the at least one processor obtains a reference data subset included in the reference data set based on the reference cathode data subset and the reference anode data subset, fits each reference data to the cell data such that the deviations between each reference data included in the reference data subset and the cell data are minimized, identifies a first specific reference data included in the reference data subset and corresponding to the smallest deviation among the deviations between each fitted reference data and the cell data, and among the plurality of designated temperatures, a temperature corresponding to a first specific reference cathode data corresponding to the first specific reference data, and a temperature corresponding to a first specific reference anode data corresponding to the first specific reference data, the cathode The temperature and the temperature of the anode can be identified.

[0019] According to one embodiment, the at least one processor identifies, before acquiring the reference cathode data subset, the first reference cathode data of the reference cathode battery cell acquired at the lowest first temperature among the plurality of designated temperatures, and the second reference cathode data of the reference cathode battery cell acquired at the highest second temperature among the plurality of designated temperatures, and can identify the reference cathode data subset corresponding to each of the plurality of designated temperatures based on the first reference cathode data and the second reference cathode data.

[0020] According to one embodiment, the at least one processor identifies, before acquiring the reference anode data subset, the first reference anode data of the reference anode battery cell acquired at the lowest first temperature among the plurality of designated temperatures, and the second reference anode data of the reference anode battery cell acquired at the highest second temperature among the plurality of designated temperatures, and can identify the reference anode data subset corresponding to each of the plurality of designated temperatures based on the first reference anode data and the second reference anode data.

[0021] According to one embodiment, the reference cathode data set includes a reference cathode data subset corresponding to each of a plurality of designated charge / discharge rates and a specific temperature among a plurality of designated temperatures, and the reference anode data set includes a reference anode data subset corresponding to each of the plurality of designated charge / discharge rates and a specific temperature among a plurality of designated temperatures, and the at least one processor obtains a reference data subset included in the reference data set based on the reference cathode data subset and the reference anode data subset, fits each reference data to the cell data such that the deviations between each reference data included in the reference data subset and the cell data are minimized, identifies a second specific reference data included in the reference data subset and corresponding to the smallest deviation among the deviations between each fitted reference data and the cell data, and among the plurality of designated temperatures, based on a charge / discharge rate corresponding to a second specific reference cathode data corresponding to the second specific reference data and a charge / discharge rate corresponding to a second specific reference anode data corresponding to the second specific reference data, and a charge / discharge rate corresponding to a second specific reference anode data corresponding to the second specific reference data, for the anode of the cathode Relative resistance, and relative resistance of the anode to the cathode can be identified.

[0022] According to one embodiment, the at least one processor can identify the voltage profile of each reference data included in the reference data set based on the result of subtracting the voltage profile of the reference cathode data from the voltage profile of the reference anode data. Each reference cathode data included in the reference data set and each reference anode data included in the reference anode data set include a voltage profile and a capacitance profile.

[0023] A battery diagnostic method according to other embodiments disclosed in this document may include the operation of acquiring a reference negative electrode data set of a reference negative electrode battery cell, the operation of acquiring a reference positive electrode data set of a reference positive electrode battery cell, the operation of acquiring cell data of a target battery cell, and the operation of identifying, based on the reference negative electrode data set, the reference positive electrode data set, and the cell data, the temperature of the negative electrode of the target battery cell at the time when the cell data is acquired and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired.

[0024] According to one embodiment, the operation of identifying the temperature of the negative electrode of the target battery cell and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired, based on the reference negative electrode data set, the reference positive electrode data set, and the cell data, may include the operation of identifying a reference data set of a reference entire battery cell that is a full cell based on the reference negative electrode data set and the reference positive electrode data set, and the operation of identifying the temperature of the negative electrode and the temperature of the positive electrode based on the reference data set and the cell data.

[0025] According to one embodiment, the operation of identifying the temperature of the negative electrode of the target battery cell and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired, based on the reference negative electrode data set, the reference positive electrode data set, and the cell data, may include the operation of dividing the cell data into a plurality of intervals, the operation of identifying interval data that is included in at least a part of the cell data and is included in any one of the plurality of intervals, and the operation of identifying the temperature of the negative electrode and the temperature of the positive electrode in any one of the intervals based on the reference negative electrode data set, the reference positive electrode data set, and the interval data.

[0026] According to one embodiment, the reference cathode data set includes a reference cathode data subset corresponding to each of a plurality of designated temperatures and a specific charge / discharge rate among a plurality of designated charge / discharge rates, and the anode data set includes a reference anode data subset corresponding to each of the plurality of designated temperatures and a specific charge / discharge rate among a plurality of designated charge / discharge rates, and the operation of identifying the temperature of the cathode and the temperature of the anode based on the reference data set and the cell data comprises: an operation of obtaining a reference data subset included in the reference data set based on the reference cathode data subset and the reference anode data subset; an operation of fitting each reference data to the cell data such that the deviations between each reference data included in the reference data subset and the cell data are minimized; an operation of identifying a first specific reference data included in the reference data subset and corresponding to the smallest deviation among the deviations between each fitted reference data and the cell data; and among the plurality of designated temperatures, a temperature corresponding to the first specific reference cathode data corresponding to the first specific reference data, and The method may include an operation to identify the temperature of the cathode and the temperature of the anode based on the temperature corresponding to the first specific reference anode data corresponding to the first specific reference data.

[0027] According to one embodiment, the operation of obtaining a reference data subset included in the reference data set based on the reference cathode data subset and the reference anode data subset may include, before obtaining the reference cathode data subset, identifying a first reference cathode data of the reference cathode battery cell obtained at the lowest first temperature among the plurality of designated temperatures and a second reference cathode data of the reference cathode battery cell obtained at the highest second temperature among the plurality of designated temperatures, and identifying the reference cathode data subset corresponding to each of the plurality of designated temperatures based on the first reference cathode data and the second reference cathode data.

[0028] According to one embodiment, the operation of obtaining a reference data subset included in the reference data set based on the reference cathode data subset and the reference anode data subset may include, before obtaining the reference anode data subset, identifying a second reference anode data of the reference anode battery cell obtained at the lowest first temperature among the plurality of designated temperatures and a third reference anode data of the reference anode battery cell obtained at the highest second temperature among the plurality of designated temperatures, and identifying the reference anode data subset corresponding to each of the plurality of designated temperatures based on the second reference anode data and the third reference anode data.

[0029] According to one embodiment, the reference cathode data set includes a reference cathode data subset corresponding to each of a plurality of designated charge / discharge rates and a specific temperature among a plurality of designated temperatures, and the reference anode data set includes a reference anode data subset corresponding to each of the plurality of designated charge / discharge rates and a specific temperature among a plurality of designated temperatures, and the battery diagnostic method comprises, based on the reference cathode data subset and the reference anode data subset, an operation of obtaining a reference data subset included in the reference data set, an operation of fitting each reference data to the cell data such that the deviations between each reference data included in the reference data subset and the cell data are minimized, an operation of identifying a second specific reference data included in the reference data subset and corresponding to the smallest deviation among the deviations between each fitted reference data and the cell data, and, among the plurality of designated temperatures, a charge / discharge rate corresponding to a second specific reference cathode data corresponding to the second specific reference data, and a charge / discharge rate corresponding to a second specific reference anode data corresponding to the second specific reference data, and a charge / discharge rate corresponding to a second specific reference anode data corresponding to the second specific reference data, wherein the cathode It may further include an operation to identify the relative resistance to the anode, and the relative resistance of the anode to the cathode.

[0030] According to one embodiment, each reference cathode data included in the reference cathode data set and each reference anode data included in the reference anode data set are,

[0031] The operation of identifying a reference data set of a reference entire battery cell that is a full cell, based on the reference negative data set and the reference positive data set, including a voltage profile and a capacity profile, may include identifying the voltage profile of each reference data included in the reference data set based on the result of subtracting the voltage profile of the reference negative data from the voltage profile of the reference positive data.

[0032] According to the embodiments disclosed in this document, the present technology can identify the temperature of the negative electrode and the temperature of the positive electrode included in each of the battery cells.

[0033] In addition, the present technology can identify the relative resistance of the negative electrode and the relative resistance of the positive electrode included in each of the battery cells.

[0034] In addition, the present technology can identify the cause of the abnormality of the battery cell by identifying the temperature of the negative electrode and the temperature of the positive electrode included in each of the battery cells.

[0035] In addition, the present technology can identify the cause of the abnormality of the battery cell by identifying the relative resistance of the negative electrode and the relative resistance of the positive electrode included in each of the battery cells.

[0036] In addition, the present technology can improve the condition diagnosis performance of battery cells by identifying the temperature of the negative electrode and the temperature of the positive electrode included in each of the battery cells.

[0037] In addition, the present technology can improve the condition diagnosis performance of battery cells by identifying the relative resistance of the negative electrode and the relative resistance of the positive electrode included in each of the battery cells.

[0038] In addition, various effects that can be identified directly or indirectly through this document may be provided.

[0039] FIG. 1 is a block diagram showing a battery pack in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0040] FIG. 2 is a block diagram showing the configuration of a battery diagnostic device in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0041] FIG. 3 illustrates an example of a graph showing reference positive electrode data, reference negative electrode data, reference data, and cell data in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0042] FIG. 4 illustrates an example of a graph showing a reference positive electrode data subset according to a plurality of specified temperatures in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0043] FIG. 5 illustrates an example of a graph showing a reference negative data subset according to a plurality of specified temperatures in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0044] FIG. 6 illustrates an example of fitting between reference data and interval data in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0045] FIG. 7 illustrates an example of a table showing deviations between each fitted reference data and cell data in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0046] FIG. 8 illustrates an example of a graph showing the actual temperature and the identified temperature of a target battery cell in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0047] FIG. 9 illustrates an example of the flow of operation of a battery diagnostic device for identifying the temperature and relative resistance of a target battery cell in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0048] FIG. 10 is a block diagram showing the hardware configuration of a computing system performing a battery diagnostic method in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0049] Some embodiments disclosed herein are described below with reference to the various embodiments of the accompanying drawings. However, this is not intended to limit the technology to specific embodiments and should be understood to include various modifications, equivalents, and / or alternatives to embodiments of the technology.

[0050] It should be noted that when assigning reference numerals to the components of each drawing, the same components are assigned the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the various embodiments disclosed in this document, if it is determined that a detailed description of related known configurations or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. The singular form of a noun corresponding to an item may include one or more items unless the relevant context clearly indicates otherwise.

[0051] In describing the components of the embodiments of this document, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components and do not limit the essence, order, or sequence of the components. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the embodiments disclosed in this document pertain. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0052] Additionally, in this disclosure, expressions of "greater than" or "less than" may be used to determine whether a specific condition is satisfied or fulfilled; however, this is merely for the purpose of expressing an example and does not exclude descriptions of "greater than" or "less than." Conditions described as "greater than" may be replaced with "greater than," conditions described as "less than" may be replaced with "less than," and conditions described as "greater than and less than" may be replaced with "greater than and less than." Furthermore, "A" to "B" below refer to at least one of the elements from A (including A) to B (including B).

[0053] In this document, each of the phrases such as "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" may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof.

[0054] In this document, where any component (e.g., 1) is referred to as being “connected,” “coupled,” or “joined” to another component (e.g., 2), with or without the terms “functionally” or “communicationally,” or where it is referred to as “coupled” or “connected,” it means that the component may be connected to the other component directly (e.g., via a wire), wirelessly, or through a third component.

[0055] According to one embodiment, the method according to the various embodiments disclosed herein may be provided as included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store or directly between two user devices. In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily created on a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0056] According to various embodiments, each component (e.g., module or program) of the described components may include a singular or multiple entities, and some of the multiple entities may be separated and placed in other components. According to various embodiments, at least one of the aforementioned components or operations may be omitted, or at least one other component or operation may be added. Generally or additionally, multiple components (e.g., module or program) may be integrated into a single component. In this case, the integrated component may perform at least one function of each of the multiple components in the same or similar manner as it was performed by the corresponding component among the multiple components prior to integration. According to various embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or at least one other operation may be added.

[0057] Hereinafter, embodiments of the present document will be described in detail with reference to FIGS. 1 to 10.

[0058] FIG. 1 is a block diagram showing a battery pack in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0059] Referring to FIG. 1, the battery pack (1) may include a battery unit (12), a sensor unit (14), a switching unit (16), and a battery management system (BMS) (20). At this time, the battery pack (1) may be equipped with a plurality of battery units (12), sensor units (14), switching units (16), and battery management systems (20).

[0060] According to one embodiment, the battery unit (12) can supply power to a target device (not shown). To this end, the battery unit (12) may be electrically connected to the target device. Here, the target device may include an electrical, electronic, or mechanical device that operates by receiving power from the battery pack (1). For example, the target device may be an electric vehicle (EV) or an energy storage system (ESS), but is not limited thereto.

[0061] According to one embodiment, the battery unit (12) may include at least one battery cell (10) capable of charging and discharging. Here, the battery cell (10) may be a basic unit of a battery cell capable of charging and discharging electrical energy. For example, the battery cell (10) may be a lithium-ion (Li-ion) battery, a lithium-ion polymer (Li-ion polymer) battery, a nickel-cadmium (Ni-Cd) battery, a nickel-hydrogen (Ni-MH) battery, etc., but is not limited thereto.

[0062] According to one embodiment, a plurality of battery units (12) may be connected in series or in parallel. For example, a battery unit (12) may be a battery module, a battery bank, or a set of battery cells (cell-to-pack structure).

[0063] According to one embodiment, the sensor unit (14) can obtain information related to the battery unit (12). According to one embodiment, the sensor unit (14) can obtain values ​​(or information) related to the state of each of the battery unit (12) or battery cells (10). In one embodiment, the values ​​related to the state may include at least one value for the voltage, current, resistance, state of charge (SOC), state of health (SOH), or temperature of the battery cell, or a combination thereof.

[0064] According to one embodiment, the sensor unit (14) can provide information of each of the plurality of battery units (12) to the battery management system (20).

[0065] According to one embodiment, the switching unit (16) may include an element for controlling the current flow for charging or discharging the battery unit (12). For example, the switching unit (16) may include at least one relay and / or magnetic contactor, etc., depending on the specifications of the battery pack (1).

[0066] According to one embodiment, a battery management system (BMS) (20) can monitor the voltage, current, temperature, etc. of a battery pack (1) and control or manage the battery pack (1) to prevent overcharging and over-discharging. For example, the battery management system (20) may include a plurality of terminals as an interface for receiving values ​​of the various parameters described above, and a circuit connected to these terminals to perform processing of the received values. Additionally, the battery management system (20) may control a sensor unit (14) and / or a switching unit (16). For example, the battery management system (20) may be connected to a plurality of battery units (12) to monitor the status of each of the plurality of battery units (12) and control the ON / OFF of relays or contactors.

[0067] According to one embodiment, the operation of the battery management system (20) can be performed by a battery management system (BMS) in the vehicle, as well as by various devices such as a server, cloud, charger, or discharger.

[0068] The upper controller (2) can transmit control signals for a plurality of battery units (12) to the battery management system (20). Accordingly, the operation of the battery management system (20) can be controlled based on the signals applied from the upper controller (2).

[0069] According to one embodiment, the battery management system (20) may include the battery diagnostic device (201) of FIG. 2. According to another embodiment, the battery management system (20) may be a different system from the battery diagnostic device (201) of FIG. 2. That is, the battery diagnostic device (201) of FIG. 2 may be included in the battery pack (1) or may be configured as another device outside the battery pack (1). For convenience of explanation, the following description assumes that the battery diagnostic device (201) is configured as another device outside the battery pack (1). Furthermore, the operation of the battery diagnostic device (201) below may be performed by a battery management system (BMS) within the vehicle, as well as by various devices such as a server, cloud, charger, or discharger.

[0070] FIG. 2 is a block diagram showing the configuration of a battery diagnostic device in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0071] FIG. 3 illustrates an example of a graph showing reference positive electrode data, reference negative electrode data, reference data, and cell data in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0072] Referring to FIGS. 2 and FIGS. 3, a battery diagnostic device (201) may include a memory (203) and at least one processor (205). The memory (203) may store at least one instruction. The at least one processor (205) may execute at least one instruction.

[0073] The graph (301) may represent reference negative data, reference positive data, reference data fitted to cell data, and cell data. The first line (303) may represent reference positive data of a reference positive battery cell that is a positive half-cell. The second line (305) may represent reference negative data of a reference negative battery cell that is a negative half-cell. The third line (307) may represent reference data of a reference full battery cell that is a full-cell identified based on the reference negative data and reference positive data. The fourth line (309) may represent cell data of a target battery cell that is subject to diagnosis.

[0074] According to one embodiment, in order to increase the accuracy of capacity measurement of a battery unit (e.g., battery pack, battery module), detect abnormalities in the battery unit, improve the quality of the battery unit, or monitor the battery unit, at least one processor (205) can measure the temperature of the battery unit.

[0075] The capacity, abnormality, and quality of the battery unit may be determined based on the capacity, abnormality, and quality of individual battery cells. The capacity, abnormality, and quality of individual battery cells included in the battery unit may vary depending on the battery cell. Therefore, in order to improve the accuracy of the capacity measurement and the accuracy of the abnormality determination of the battery unit, at least one processor (205) may need to measure the temperature of the individual battery cells.

[0076] Temperature sensors may be attached per battery unit rather than per battery cell. This is because the cost of temperature measurement when a sensor is attached per battery cell is greater than the cost when a sensor is attached per battery unit. Therefore, battery diagnostic devices have faced difficulties in measuring the temperature of individual battery cells using temperature sensors.

[0077] According to one embodiment, the battery diagnostic device (201) can identify the temperature of an individual battery cell or identify the capacity of an individual battery cell based on an electrochemical signal of the battery cell.

[0078] However, even if the temperature of the battery cell is identified, the temperature of the negative electrode and the temperature of the positive electrode may differ within the battery cell, and the relative resistance of the negative electrode and the relative resistance of the positive electrode may differ.

[0079] According to one embodiment, at least one processor (205) can acquire cell data of a target battery cell comprising a cathode at a first temperature having a first resistance and a positive electrode at a second temperature having a second resistance. The target battery cell may represent a battery cell that is the target for which the at least one processor (205) identifies a temperature or relative resistance. The cell data may include a capacity profile of the target battery cell and a voltage profile of the target battery cell. For example, the cell data may include a graph representing a voltage profile according to the capacity profile of the target battery cell. In the graph (301), the cell data may be represented by a fourth line (309).

[0080] According to one embodiment, at least one processor (205) may include a set of reference negative data (e.g., capacity profile of the reference negative battery cell, voltage profile of the reference negative battery cell) corresponding to a combination of any one of a plurality of specified charge / discharge rates and any one of a plurality of specified temperatures.

[0081] In other words, reference cathode data can be obtained while a reference cathode battery cell having a temperature of any one of a plurality of specified temperatures is charged or discharged at any one of a plurality of specified charge / discharge rates. In graph (301), the reference cathode data included in the reference cathode data set can be represented by the second line (305).

[0082] According to one embodiment, at least one processor (205) may include a set of reference positive data (e.g., capacity profile of the reference positive battery cell, voltage profile of the reference positive battery cell) of a reference positive battery cell corresponding to a combination of any one of a plurality of specified charge / discharge rates and any one of a plurality of specified temperatures.

[0083] In other words, reference anode data can be obtained while a reference anode battery cell having a temperature of any one of a plurality of specified temperatures is charged or discharged at any one of a plurality of specified charge / discharge rates. In the graph (301), the reference anode data included in the reference anode data set can be represented by the first line (303).

[0084] The temperature corresponding to the reference cathode data and the temperature corresponding to the reference anode data may be the same or different, and the charge / discharge rate corresponding to the reference cathode data and the charge / discharge rate corresponding to the reference anode data may be the same or different.

[0085] According to one embodiment, at least one processor (205) can identify a set of reference data (e.g., capacity profile of the reference full battery cell, voltage profile of the reference full battery cell) of a reference full battery cell based on a reference negative electrode data set and a reference positive electrode data set.

[0086] For example, at least one processor (205) can identify the voltage profile of each reference data included in the reference data set based on the result of subtracting the voltage profile of the reference negative data from the voltage profile of the reference positive data. This is because the voltage profile of the target battery cell can be identified by the value obtained by subtracting the voltage profile of the negative from the voltage profile of the positive. In the graph (301), the reference data included in the reference data set can be represented by the third line (307).

[0087] According to one embodiment, the reference data set may include a set of capacity profiles of a reference battery cell corresponding to a combination of any one of a plurality of specified charge / discharge rates and any one of a plurality of specified temperatures, or a set of voltage profiles of a reference battery cell corresponding to each of a plurality of specified temperatures corresponding to a combination of any one of a plurality of specified charge / discharge rates and any one of a plurality of specified temperatures.

[0088] For example, any one reference data included in the reference data set may include a graph showing the voltage profile according to the capacity profile of a reference total battery cell combined with a reference negative battery cell at approximately 25°C charged at a charge-discharge rate of approximately 0.33 C-rate (capacity rate) and a reference negative battery cell at approximately 33°C charged at a charge-discharge rate of approximately 0.25 C-rate.

[0089] According to one embodiment, at least one processor (205) can fit each reference data to the cell data such that the deviations between each reference data and the cell data included in the reference data set are minimized.

[0090] For example, at least one processor (205) can enlarge or shrink the graph representing the voltage profile according to the capacity profile of the reference battery cell with respect to the capacity variable by calculating a specific first value in the capacity profile of the graph representing the voltage profile according to the capacity profile of the reference battery cell included in the reference data.

[0091] For example, at least one processor (205) can move a graph representing a voltage profile according to the capacity profile of a reference whole battery cell to the capacity profile axis or voltage profile axis by adding a second value specific to the capacity profile or voltage profile of a graph representing a voltage profile according to the capacity profile of a reference whole battery cell included in the reference data.

[0092] For example, at least one processor (205) can fit the reference data to the cell data such that the deviation between the reference data and the cell data is minimized by shrinking, enlarging, or moving the reference data.

[0093] For example, at least one processor (205) can fit each reference data included in the reference data set (e.g., a graph showing a voltage profile according to the capacity profile of a reference total battery cell combined with a reference negative battery cell at about 25°C charged at a charge-discharge rate of about 0.33 C-rate and a reference negative battery cell at about 33°C charged at a charge-discharge rate of about 0.25 C-rate, a graph showing a voltage profile according to the capacity profile of a reference total battery cell combined with a reference negative battery cell at about 33°C charged at a charge-discharge rate of about 0.33 C-rate and a reference negative battery cell at about 27°C charged at a charge-discharge rate of about 0.33 C-rate) to the cell data.

[0094] According to one embodiment, at least one processor (205) can identify a specific reference data (e.g., a third line (307)) corresponding to the smallest deviation among the deviations of each fitted reference data and cell data.

[0095] For example, if the minimized deviation of the first reference data is about 0.29117 mV (milli-voltage), the minimized deviation of the second reference data is about 0.15843 mV, and the minimized deviation of the third reference data is about 0.21843 mV, then a specific reference data can be identified as the second reference data.

[0096] According to one embodiment, at least one processor (205) can identify a first temperature of the negative electrode of a target battery cell based on the temperature of reference negative electrode data corresponding to specific reference data.

[0097] According to one embodiment, at least one processor (205) can identify a second temperature of the positive electrode of a target battery cell based on the temperature of reference positive electrode data corresponding to specific reference data.

[0098] According to one embodiment, at least one processor (205) can identify the relative resistance of the negative electrode of a target battery cell to the positive electrode based on the charge / discharge rate of specific reference negative electrode data corresponding to specific reference data. The greater the charge / discharge rate of the specific reference negative electrode data, the greater the relative resistance of the negative electrode of the target battery cell to the positive electrode.

[0099] According to one embodiment, at least one processor (205) can identify the relative resistance of the positive electrode of a target battery cell to the negative electrode based on the charge / discharge rate of reference positive electrode data corresponding to specific reference data. The greater the charge / discharge rate of the reference positive electrode data, the greater the relative resistance of the positive electrode of the target battery cell to the negative electrode.

[0100] For example, at least one processor (205) can identify the temperature of the negative electrode included in the target battery cell as approximately 33°C when the temperature of the specific reference negative electrode data corresponding to the specific reference data is approximately 33°C. At least one processor (205) can identify the temperature of the positive electrode included in the target battery cell as approximately 25°C when the temperature of the reference positive electrode data corresponding to the specific reference data is approximately 25°C.

[0101] At least one processor (205) can identify that the resistance of the cathode is smaller than the resistance of the anode when the charge / discharge rate of the specific reference cathode data corresponding to the specific reference data is about 0.33 C-rate and the charge / discharge rate of the reference anode data corresponding to the specific reference data is about 1 C-rate.

[0102] In FIGS. 2 and FIGS. 3, each reference data is described to be fitted to the entire cell data, but the embodiments of this document are not limited thereto.

[0103] According to one embodiment, at least one processor (205) divides cell data into a plurality of segments, identifies segment data that is included in at least a portion of the cell data and is included in any one of the plurality of segments, identifies a reference data set identified based on a reference negative data set and a reference positive data set, and fits each reference data to the segment data such that the deviation between each reference data included in the reference data set and the segment data is minimized. This is because the temperature and relative resistance of the target battery cell may change while the target battery cell is being charged or discharged and cell data is being acquired.

[0104] According to one embodiment, at least one processor (205) can identify the temperature of the cathode and the temperature of the anode in any one section based on the fitting result, or identify the relative resistance of the cathode to the anode and the relative resistance of the anode to the cathode. The section data is described below with reference to FIG. 6.

[0105] In FIG. 2 and FIG. 3, it is described that a reference cathode data set, a reference anode data set, and a reference data set are identified based on a combination of any one of a plurality of specified charge / discharge rates and any one of a plurality of specified temperatures, but the embodiments of this document are not limited thereto.

[0106] According to one embodiment, at least one processor (205) can identify the temperature of the cathode and the temperature of the anode based on a reference cathode data subset corresponding to each of a plurality of designated temperatures and a specific charge / discharge rate among a plurality of designated charge / discharge rates, and a reference anode data subset corresponding to each of a plurality of designated temperatures and a specific charge / discharge rate.

[0107] More specifically, at least one processor (205) can obtain a reference data subset according to a specific charge / discharge rate that is included in a reference data set and according to a specific charge / discharge rate, based on a reference cathode data subset according to a specific charge / discharge rate and a reference anode data subset according to a specific charge / discharge rate. At least one processor (205) can fit each reference data to the cell data such that the deviations between each reference data and the cell data included in the reference data subset according to a specific charge / discharge rate are minimized. At least one processor (205) can identify a first specific reference data corresponding to the smallest deviation among the deviations between each fitted reference data and the cell data. At least one processor (205) can identify the temperature of the cathode and the temperature of the anode based on the temperature of the first specific reference cathode data corresponding to the first specific reference data and the temperature of the second reference anode data corresponding to the first specific reference data.

[0108] According to one embodiment, at least one processor (205) can identify the relative resistance of the cathode to the anode and the relative resistance of the anode to the cathode based on a reference cathode data subset corresponding to each of a plurality of designated charge / discharge rates and a specific temperature among a plurality of designated temperatures, and a reference anode data subset corresponding to each of a plurality of designated charge / discharge rates and a specific temperature among a plurality of designated temperatures.

[0109] More specifically, at least one processor (205) can obtain a reference data subset for a specific temperature that is included in a reference data set, based on a reference cathode data subset for a specific temperature and a reference anode data subset for a specific temperature. At least one processor (205) can fit each reference data to the cell data such that the deviations between each reference data and the cell data included in the reference data subset for a specific temperature are minimized. At least one processor (205) can identify the relative resistance of the cathode to the anode and the relative resistance of the anode to the cathode based on the charge / discharge rate of the second specific reference cathode data corresponding to the second specific reference data corresponding to the smallest deviation among the deviations between each fitted reference data and the cell data, and the charge / discharge rate of the second specific reference anode data corresponding to the second specific reference data.

[0110] FIG. 4 illustrates an example of a graph showing a reference positive electrode data subset according to a plurality of specified temperatures in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0111] Referring to FIG. 4, the graph (401) can be represented as a graph showing a voltage profile according to a capacity profile, with reference anode data subsets at a specific charge / discharge speed among a plurality of designated charge / discharge speeds. The first line (403) may represent first reference positive data of a reference positive battery cell obtained at the lowest first temperature among a plurality of designated temperatures (e.g., about 25°C). The second line (405) may represent second reference positive data of a reference positive battery cell obtained at the highest second temperature among a plurality of designated temperatures (e.g., about 45°C). The third line (411) may represent reference positive data at a third temperature between the first temperature and the second temperature (e.g., about 26°C). The fourth line (413) may represent reference data at a fourth temperature between the third temperature and the second temperature (e.g., about 27°C). The fifth line (415) may represent reference data at a fifth temperature between the fourth temperature and the second temperature (e.g., about 28°C). The third temperature may be higher than the first temperature, the fourth temperature may be higher than the third temperature, the fifth temperature may be higher than the fourth temperature, and the second temperature may be higher than the fifth temperature.

[0112] According to one embodiment, at least one processor (205) can identify a reference anode data subset (e.g., a third line (411), a fourth line (413), a fifth line (415)) corresponding to each of the temperatures that are higher than the first temperature and lower than the second temperature among a plurality of specified temperatures by interpolating a first line (403) representing first reference anode data and a second line (405) representing second reference anode data.

[0113] For example, at least one processor (205) can obtain voltage values ​​of reference anode data at a plurality of specified temperatures corresponding to a specific capacity by dividing the interval between a first voltage value of first reference anode data corresponding to a specific capacity and a second voltage value of second reference anode data corresponding to a specific capacity into a specified number of intervals (e.g., about 20 intervals). The size of each interval may be the same.

[0114] According to one embodiment, at least one processor (205) can identify a reference anode data subset based on a reference anode data subset, a first reference anode data, and a second reference anode data.

[0115] FIG. 5 illustrates an example of a graph showing a reference negative data subset according to a plurality of specified temperatures in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0116] Referring to FIG. 5, the graph (501) can represent a reference cathode data subset at a specific charge / discharge speed among a plurality of specified charge / discharge speeds as a graph showing a voltage profile according to the capacity profile. The first line (503) may represent first reference negative data of a reference negative battery cell obtained at the lowest first temperature (e.g., about 25°C) among a plurality of designated temperatures. The second line (505) may represent second reference negative data of a reference negative battery cell obtained at the highest second temperature (e.g., about 45°C) among a plurality of designated temperatures. The third line (517) may represent reference negative data at a third temperature (e.g., about 26°C) between the first temperature and the second temperature. The fourth line (515) may represent reference data at a fourth temperature (e.g., about 42°C) between the third temperature and the second temperature. The fifth line (513) may represent reference data at a fifth temperature (e.g., about 43°C) between the fourth temperature and the second temperature. The sixth line (511) may represent reference data at a sixth temperature (e.g., about 44°C) between the fifth temperature and the second temperature.

[0117] The third temperature may be higher than the first temperature, the fourth temperature may be higher than the third temperature, the fifth temperature may be higher than the fourth temperature, the sixth temperature may be higher than the fifth temperature, and the second temperature may be higher than the sixth temperature.

[0118] According to one embodiment, at least one processor (205) can identify a reference cathode data subset (e.g., a third line (517), a fourth line (515), a fifth line (513), a sixth line (511)) corresponding to each of the temperatures that are higher than the first temperature and lower than the second temperature among a plurality of specified temperatures by interpolating a first line (503) representing first reference cathode data and a second line (505) representing second reference cathode data.

[0119] For example, at least one processor (205) can obtain voltage values ​​of reference cathode data at a plurality of specified temperatures corresponding to a specific capacity by dividing the interval between a first voltage value of first reference cathode data corresponding to a specific capacity and a second voltage value of second reference cathode data corresponding to a specific capacity into a specified number of intervals (e.g., about 20 intervals). The size of each interval may be the same.

[0120] According to one embodiment, at least one processor (205) can identify a reference cathode data subset based on a reference cathode data subset, a first reference cathode data, and a second reference cathode data.

[0121] FIG. 6 illustrates an example of fitting between reference data and interval data in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0122] Referring to FIG. 6, graph (601) may represent a voltage profile according to a capacity profile included in the cell data. Graph (603) may represent a graph in which a first line (611) representing reference data is fitted to a second line (613) representing section data of a first section (602). Graph (605) may represent a graph in which a third line (621) representing reference data is fitted to a fourth line (623) representing section data of a second section (604). Graph (607) may represent a graph in which a fifth line (631) representing reference data is fitted to a sixth line (633) representing section data of a third section (606). The first section (602), the second section (604), and the third section (606) may be distinguished based on the capacity of the target battery cell.

[0123] According to one embodiment, at least one processor (205) can identify specific reference data corresponding to the smallest deviation (e.g., root mean squared error (RMSE)) among the deviations of the section data, which are cell data in specific sections (e.g., first section (602), second section (604), third section (606)) and each fitted reference data among the reference data sets, and can identify the relative resistance of the cathode to the anode based on the charge / discharge rate corresponding to the specific reference cathode data corresponding to the specific reference data. Additionally, at least one processor (205) can identify the relative resistance of the anode to the cathode based on the charge / discharge rate corresponding to the specific reference anode data corresponding to the specific reference data.

[0124] According to one embodiment, at least one processor (205) can identify the temperature of an anode based on a temperature corresponding to specific reference anode data corresponding to specific reference data, and can identify the temperature of a cathode based on a temperature corresponding to specific reference cathode data corresponding to specific reference data.

[0125] At least one processor (205) can divide the target battery cell into sections according to capacity, since the temperature and relative resistance may vary depending on the section of the target battery cell, and identify the temperature of the negative electrode, the temperature of the positive electrode, the relative resistance of the negative electrode to the positive electrode, and the relative resistance of the positive electrode to the negative electrode of the target battery cell for each capacity section.

[0126] FIG. 7 illustrates an example of a table showing deviations between each fitted reference data and cell data in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0127] FIG. 8 illustrates an example of a graph showing the actual temperature and the identified temperature of a target battery cell in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0128] In FIGS. 7 and 8, reference data is described such that the charge / discharge rate of the reference anode data corresponding to the reference data and the charge / discharge rate of the reference cathode data corresponding to the reference data are the same, and the temperature of the reference anode data corresponding to the reference data and the temperature of the reference cathode data corresponding to the reference data are the same. However, the embodiments of this document may not be limited thereto.

[0129] Referring to FIGS. 7 and 8, the table (701) may represent deviations of reference data fitted to specific interval data, the temperature of reference positive data corresponding to the reference data, the temperature of reference negative data corresponding to the reference data, the charge / discharge rate of reference positive data corresponding to the reference data, and the charge / discharge rate of reference positive data corresponding to the reference data. In FIGS. 7 and 8, the temperature of the negative electrode of the target battery cell is the same as the temperature of the positive electrode of the target battery cell, so it may be referred to as the temperature of the target battery cell.

[0130] The graph (801) may represent cell data divided into multiple sections, the actual temperature of the target battery cell, and the temperature of the target battery cell for each of the multiple sections identified by the battery diagnostic device (201). The first line (803) may represent the actual temperature of the target battery cell. The second line (807) may represent the voltage profile according to the capacity profile of the target battery cell. The points (805) may represent the temperature of the target battery cell identified through the battery diagnostic device according to one embodiment.

[0131] According to one embodiment, the charge / discharge rate of the reference anode data corresponding to the reference data included in the table (701), and the charge / discharge rate of the reference cathode data corresponding to the reference data may be about 0.33 C-rate.

[0132] According to one embodiment, when the temperature of the reference cathode data and the temperature of the reference anode data are about 25°C, the deviation between the fitted reference data and the specific interval data may be about 2.3276 mV; when the temperature of the reference cathode data and the temperature of the reference anode data are about 27°C, the deviation between the fitted reference data and the specific interval cell data may be about 3.2321 mV; when the temperature of the reference cathode data and the temperature of the reference anode data are about 29°C, the deviation between the fitted reference data and the specific interval data may be about 3.2411 mV; when the temperature of the reference cathode data and the temperature of the reference cathode data are about 31°C, the deviation between the fitted reference data and the specific interval data may be about 2.2337 mV; when the temperature of the reference cathode data and the temperature of the reference cathode data are about 33°C, the deviation between the fitted reference data and the specific interval data may be about 1.9086 mV; and when the temperature of the reference cathode data and the temperature of the reference cathode data are about 35°C, the fitted The deviation between the reference data and the specific interval data may be approximately 1.6817 mV, and when the temperature of the reference cathode data and the temperature of the reference cathode data is approximately 37°C, the deviation between the fitted reference data and the specific interval data may be approximately 1.9105 mV, and when the temperature of the reference cathode data and the temperature of the reference cathode data is approximately 39°C, the deviation between the fitted reference data and the specific interval data may be approximately 2.6867 mV, and when the temperature of the reference cathode data and the temperature of the reference cathode data is approximately 41°C, the deviation between the fitted reference data and the specific interval data may be approximately 3.3447 mV, and when the temperature of the reference cathode data and the temperature of the reference cathode data is approximately 43°C, the deviation between the fitted reference data and the specific interval data may be approximately 3.2582 mV, and when the temperature of the reference cathode data and the temperature of the reference cathode data is approximately 45°C, the deviation between the fitted reference data and the specific interval data may be approximately 2.7022 mV.

[0133] According to one embodiment, the smallest deviation among the deviations of the reference data fitted to the specific section data corresponding to a specific section (e.g., a section where the state of charge (SOC) of the target battery cell is about 33% to about 66%) and the specific section data may be about 1.6817 mV. The temperature of the specific reference negative data corresponding to the specific reference data corresponding to the smallest deviation, and the temperature of the specific reference positive data corresponding to the specific reference data may be about 35°C.

[0134] Therefore, the temperature of the negative electrode and the positive electrode of the target battery cell in a specific range may be about 35℃.

[0135] According to one embodiment, at least one processor (205) can divide cell data into a plurality of segments (e.g., three segments) and identify segment data included in any one of the plurality of segments. For example, at least one processor (205) can divide cell data into a first segment in which the capacity of the target battery cell is about 0 mAh (milliampere-hour) or more and about 36.3 mAh or less, a second segment in which the capacity of the target battery cell is about 36.3 mAh or more and about 72.6 mAh or less, and a third segment in which the capacity of the target battery cell is about 72.6 mAh or more and about 110 mAh or less. A specific segment of FIG. 7 may correspond to the second segment of FIG. 8.

[0136] According to one embodiment, at least one processor (205) can identify the temperature of the cathode and the temperature of the anode in the interval corresponding to the interval data based on fitting reference data to the interval data.

[0137] According to one embodiment, with reference to points (805), in the first section, the temperature of the target battery cell may be about 27°C. In the second section, the temperature of the target battery cell may be about 35°C. In the third section, the temperature of the target battery cell may be about 45°C.

[0138] FIG. 9 illustrates an example of the flow of operation of a battery diagnostic device for identifying the temperature and relative resistance of a target battery cell in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0139] In the following description, it is assumed that at least one processor (205) included in the battery diagnostic device (201) of FIG. 2 performs the process of FIG. 9. Additionally, in the description of FIG. 9, the operation described as being performed by the battery diagnostic device (201) and the operation described as being performed by at least one processor (205) can be understood as being controlled by at least one processor (205) included in the battery diagnostic device (201).

[0140] Referring to FIG. 9, in the first operation (901), at least one processor (205) according to one embodiment can obtain a reference negative data set of a reference negative battery cell that is a negative half cell.

[0141] In the second operation (903), at least one processor (205) according to one embodiment can obtain a reference positive data set of a reference positive battery cell that is a positive half cell.

[0142] In the third operation (905), at least one processor (205) according to one embodiment can acquire cell data of a target battery cell.

[0143] In the fourth operation (907), at least one processor (205) according to one embodiment can identify the temperature of the cathode and the temperature of the anode, or identify the relative resistance of the cathode to the anode and the relative resistance of the anode to the cathode.

[0144] In other words, at least one processor (205) according to one embodiment can diagnose the state of a target battery cell based on a reference negative electrode data set, a reference positive electrode data set, and cell data.

[0145] According to one embodiment, at least one processor (205) can identify, based on a reference negative electrode data set, a reference positive electrode data set, and cell data, the temperature of the negative electrode of a target battery cell at the time when cell data is acquired and the temperature of the positive electrode of a target battery cell at the time when cell data is acquired, or based on a reference negative electrode data set, a reference positive electrode data set, and cell data, the relative resistance of the negative electrode to the positive electrode at the time when cell data is acquired and the relative resistance of the positive electrode to the negative electrode at the time when cell data is acquired.

[0146] FIG. 10 is a block diagram showing the hardware configuration of a computing system performing a battery diagnostic method in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0147] Referring to FIG. 10, a computing system (1000) according to one embodiment disclosed in this document may include an MCU (1010), a memory (1020), an input / output I / F (1030), and a communication I / F (1040).

[0148] The MCU (1010) may be one or more processors that execute various programs stored in memory (1020) (e.g., battery cell data collection program, graph generation program, data analysis program, data decomposition algorithm, normalization program, battery cell diagnosis program, etc.), process various information including characteristic data of the battery cell, potential variables, etc. through these programs, and perform the functions of the battery diagnosis device (201) shown in FIGS. 2 to 9.

[0149] The memory (1020) can store various programs such as a battery cell data collection program, a graph generation program, a data analysis program, a data decomposition algorithm, a normalization program, and a battery cell diagnosis program.

[0150] Multiple such memories (1020) may be provided as needed. The memories (1020) may be volatile memories or non-volatile memories. As volatile memories, the memory (1020) may use RAM, DRAM, SRAM, etc. As non-volatile memories, the memory (1020) may use ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. The examples of the listed memories (1020) are merely examples and are not limited to these examples.

[0151] The input / output I / F (1030) can provide an interface that enables data transmission and reception between an input device (not shown), such as a keyboard, mouse, or touch panel, an output device (not shown), and an MCU (1010).

[0152] The communication I / F (1040) is configured to transmit and receive various data with a server and may be various devices capable of supporting wired or wireless communication. For example, the battery diagnostic device (201) can transmit and receive various information, including the shape model of a battery cell, from a separately provided external server via the communication I / F (1040).

[0153] In this way, a computer program according to one embodiment disclosed in this document may be recorded in memory (1020) and processed by an MCU (1010) so as to be implemented as a module that performs, for example, the functions illustrated in FIG. 2.

[0154] As described above, even though all components constituting the embodiments disclosed in this document have been described as being combined or operating in combination, the embodiments disclosed in this document are not necessarily limited to such embodiments. That is, within the scope of the purposes of the embodiments disclosed in this document, all components may be selectively combined in one or more ways to operate.

[0155] Furthermore, terms such as "include," "compose," or "have" as described above, unless specifically stated otherwise, mean that the relevant component may be inherent; thus, they should be interpreted as allowing for the inclusion of additional components rather than excluding them. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the embodiments disclosed in this document pertain, unless otherwise defined. Commonly used terms, such as those defined in advance, should be interpreted in accordance with their contextual meanings in the relevant technology and, unless explicitly defined in this document, should not be interpreted in an ideal or overly formal sense.

[0156] The foregoing disclosure outlines the features of several embodiments to enable those skilled in the art to better understand the aspects of the present disclosure. Those skilled in the art will understand that the present disclosure can be readily used as a basis for designing or modifying other structures to perform the same purpose or achieve the same advantages as the embodiments introduced herein. Furthermore, those skilled in the art will recognize that such equivalent configurations do not depart from the scope of the present disclosure and that various changes, substitutions, and modifications may be made in the present disclosure without departing from the scope of the present disclosure.

Claims

1. Memory storing at least one instruction; and It includes at least one processor that executes the above at least one instruction, and The above-mentioned at least one processor is, Acquire a reference cathode data set of a reference cathode battery cell, and Acquire a reference anode data set of a reference anode battery cell, and Acquire cell data of the target battery cell, and Based on the reference negative electrode data set, the reference positive electrode data set, and the cell data, the method is configured to identify the temperature of the negative electrode of the target battery cell at the time when the cell data is acquired, and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired. Battery diagnostic device.

2. In Claim 1, The above-mentioned at least one processor is, Based on the above reference cathode data set and the above reference anode data set, identify the reference data set of a reference entire battery cell that is a full cell, and Configured to identify the temperature of the cathode and the temperature of the anode based on the above reference data set and the above cell data, Battery diagnostic device.

3. In Claim 1, The above-mentioned at least one processor is, The above cell data is divided into multiple sections, and Identifying section data that is included in at least a portion of the cell data and is included in any one of the plurality of sections, and Based on the above reference cathode data set, the above reference anode data set, and the above interval data, Configured to identify the temperature of the cathode and the temperature of the anode in any one of the above sections, Battery diagnostic device.

4. In Claim 2, The above reference cathode data set is, It includes a reference cathode data subset corresponding to each of a plurality of designated temperatures and a specific charge / discharge rate among a plurality of designated charge / discharge rates, and The above anode data set is, It includes a reference anode data subset corresponding to each of the plurality of specified temperatures and a specific charge / discharge rate among the plurality of specified charge / discharge rates, The above-mentioned at least one processor is, Based on the above reference cathode data subset and the above reference anode data subset, a reference data subset included in the above reference data set is obtained, and Each reference data included in the above reference data subset is fitted to the cell data such that the deviation between each reference data and the cell data is minimized, and Identifying a first specific reference data included in the above reference data subset and corresponding to the smallest deviation among the deviations of each fitted reference data and the cell data, and Among the plurality of specified temperatures, configured to identify the temperature of the cathode and the temperature of the anode based on the temperature corresponding to the first specific reference cathode data corresponding to the first specific reference data and the temperature corresponding to the first specific reference anode data corresponding to the first specific reference data. Battery diagnostic device.

5. In Claim 4, The above-mentioned at least one processor is, Before obtaining the above reference cathode data subset, identify the first reference cathode data of the reference cathode battery cell obtained at the lowest first temperature among the plurality of designated temperatures, and the second reference cathode data of the reference cathode battery cell obtained at the highest second temperature among the plurality of designated temperatures, and Based on the first reference cathode data and the second reference cathode data, configured to identify a subset of the reference cathode data corresponding to each of the plurality of designated temperatures, Battery diagnostic device.

6. In Claim 4, The above-mentioned at least one processor is, Before obtaining the above reference anode data subset, identify the first reference anode data of the reference anode battery cell obtained at the lowest first temperature among the plurality of designated temperatures, and the second reference anode data of the reference anode battery cell obtained at the highest second temperature among the plurality of designated temperatures, and Based on the first reference anode data and the second reference anode data, configured to identify the reference anode data subset corresponding to each of the plurality of designated temperatures, Battery diagnostic device.

7. In Claim 2, The above reference cathode data set is, It includes a reference cathode data subset corresponding to each of a plurality of designated charge / discharge rates and a specific temperature among a plurality of designated temperatures, The above reference anode data set is, It includes a reference anode data subset corresponding to each of the plurality of specified charge / discharge rates and a specific temperature among the plurality of specified temperatures, The above-mentioned at least one processor is, Based on the above reference cathode data subset and the above reference anode data subset, a reference data subset included in the above reference data set is obtained, and Each reference data included in the above reference data subset is fitted to the cell data such that the deviation between each reference data and the cell data is minimized, and Identifying a second specific reference data included in the above reference data subset and corresponding to the smallest deviation among the deviations of each fitted reference data and the cell data, and Among the plurality of specified temperatures, configured to identify the relative resistance of the cathode to the anode and the relative resistance of the anode to the cathode based on the charge / discharge rate corresponding to the second specific reference cathode data corresponding to the second specific reference data and the charge / discharge rate corresponding to the second specific reference anode data corresponding to the second specific reference data. Battery diagnostic device.

8. In Claim 2, The above-mentioned at least one processor is, Each reference cathode data included in the above reference cathode data set, and each reference anode data included in the above reference anode data set, are Includes voltage profile and capacitance profile, A configuration for identifying the voltage profile of each reference data included in the reference data set based on the result of subtracting the voltage profile of the reference cathode data from the voltage profile of the reference anode data. Battery diagnostic device.

9. Operation of acquiring a reference negative data set of a reference negative battery cell; Operation of acquiring a reference positive data set of a reference positive battery cell; Operation of acquiring cell data of a target battery cell; and Based on the reference negative electrode data set, the reference positive electrode data set, and the cell data, the operation of identifying the temperature of the negative electrode of the target battery cell at the time when the cell data is acquired, and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired, Battery diagnostic method.

10. In Claim 9, Based on the above reference negative electrode data set, the above reference positive electrode data set, and the above cell data, the operation of identifying the temperature of the negative electrode of the target battery cell at the time when the cell data is acquired, and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired, is, An operation to identify a reference data set of a reference entire battery cell that is a full cell based on the above reference negative electrode data set and the above reference positive electrode data set; and The operation of identifying the temperature of the cathode and the temperature of the anode based on the above reference data set and the above cell data, Battery diagnostic method.

11. In Claim 9, Based on the above reference negative electrode data set, the above reference positive electrode data set, and the above cell data, the operation of identifying the temperature of the negative electrode of the target battery cell at the time when the cell data is acquired, and the temperature of the positive electrode of the target battery cell at the time when the cell data is acquired, is, The operation of dividing the above cell data into multiple sections; An operation to identify section data that is included in at least a portion of the cell data and is included in any one of the plurality of sections; and Based on the reference cathode data set, the reference anode data set, and the interval data, the operation of identifying the temperature of the cathode and the temperature of the anode in any one of the intervals, Battery diagnostic method.

12. In Claim 10, The above reference cathode data set is, It includes a reference cathode data subset corresponding to each of a plurality of designated temperatures and a specific charge / discharge rate among a plurality of designated charge / discharge rates, and The above anode data set is, It includes a reference anode data subset corresponding to each of the plurality of specified temperatures and a specific charge / discharge rate among the plurality of specified charge / discharge rates, Based on the above reference data set and the cell data, the operation of identifying the temperature of the cathode and the temperature of the anode is, An operation to obtain a reference data subset included in the reference data set based on the reference cathode data subset and the reference anode data subset; An operation of fitting each reference data to the cell data such that the deviations between each reference data included in the reference data subset and the cell data are minimized; An operation to identify a first specific reference data included in the above reference data subset and corresponding to the smallest deviation among the deviations of each fitted reference data and the cell data; and Among the plurality of specified temperatures, the method includes an operation of identifying the temperature of the cathode and the temperature of the anode based on the temperature corresponding to the first specific reference cathode data corresponding to the first specific reference data and the temperature corresponding to the first specific reference anode data corresponding to the first specific reference data. Battery diagnostic method.

13. In Claim 12, Based on the above reference cathode data subset and the above reference anode data subset, the operation of obtaining a reference data subset included in the reference data set is, Before obtaining the reference cathode data subset above, an operation of identifying the first reference cathode data of the reference cathode battery cell obtained at the lowest first temperature among the plurality of designated temperatures, and the second reference cathode data of the reference cathode battery cell obtained at the highest second temperature among the plurality of designated temperatures; and Based on the first reference cathode data and the second reference cathode data, the operation of identifying a subset of the reference cathode data corresponding to each of the plurality of designated temperatures, Battery diagnostic method.

14. In Claim 12, Based on the above reference cathode data subset and the above reference anode data subset, the operation of obtaining a reference data subset included in the reference data set is, Before obtaining the reference anode data subset, the operation of identifying the second reference anode data of the reference anode battery cell obtained at the lowest first temperature among the plurality of designated temperatures, and the third reference anode data of the reference anode battery cell obtained at the highest second temperature among the plurality of designated temperatures; and Based on the second reference anode data and the third reference anode data, the operation of identifying a subset of the reference anode data corresponding to each of the plurality of designated temperatures, Battery diagnostic method.

15. In Claim 9, The above reference cathode data set is, It includes a reference cathode data subset corresponding to each of a plurality of designated charge / discharge rates and a specific temperature among a plurality of designated temperatures, The above reference anode data set is, It includes a reference anode data subset corresponding to each of the plurality of specified charge / discharge rates and a specific temperature among the plurality of specified temperatures, An operation to obtain a reference data subset included in the reference data set based on the reference cathode data subset and the reference anode data subset; An operation of fitting each reference data to the cell data such that the deviations between each reference data included in the reference data subset and the cell data are minimized; An operation to identify a second specific reference data included in the above reference data subset and corresponding to the smallest deviation among the deviations of each fitted reference data and the cell data; and The method further comprises an operation of identifying the relative resistance of the cathode to the anode and the relative resistance of the anode to the cathode based on, among the plurality of specified temperatures, a charge / discharge rate corresponding to the second specific reference cathode data corresponding to the second specific reference data, and a charge / discharge rate corresponding to the second specific reference anode data corresponding to the second specific reference data. Battery diagnostic method.

16. In Claim 10, Each reference cathode data included in the above reference cathode data set, and each reference anode data included in the above reference anode data set, are Includes voltage profile and capacitance profile, The operation of identifying a reference data set of a reference entire battery cell that is a full cell, based on the above reference negative electrode data set and the above reference positive electrode data set, is, The operation of identifying the voltage profile of each reference data included in the reference data set based on the result of subtracting the voltage profile of the reference cathode data from the voltage profile of the reference anode data. Battery diagnostic method.

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