Battery diagnostic device and method thereof

Abstract

A battery diagnostic device may include: a memory storing at least one instruction; and at least one processor executing at least one instruction, wherein the at least one processor may be configured to execute a charging process in which a charging segment and a first rest segment at a specific charging rate are alternately repeated for a battery cell, or to execute a discharging process in which a discharging segment and a second rest segment at a specific discharging rate are alternately repeated for a battery cell, acquiring the resistance of the battery cell while executing the charging or discharging process, and diagnosing the charging capacity of the battery cell based on the resistance of the battery cell.

Description

Technical Field

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2024-0024920, filed on February 21, 2024, and Korean Patent Application No. 10-2025-0012386, filed on January 31, 2025, the disclosures of which are incorporated herein by reference. Technical Field

[0004] The embodiments disclosed herein relate to battery diagnostic devices and methods. Background Technology

[0005] In recent years, research and development of rechargeable batteries have been actively pursued. Here, rechargeable batteries are batteries capable of being recharged and discharged, and can be interpreted as including conventional Ni / Cd batteries, Ni / MH batteries, and more recently, lithium-ion batteries. In recent years, lithium-ion batteries have expanded their applications to power sources for electric vehicles, thus attracting attention as a next-generation energy storage medium.

[0006] With the proliferation of various electronic devices due to the Fourth Industrial Revolution, battery use is rapidly increasing. Batteries are gaining attention as a crucial energy source in various fields such as electric vehicles, portable electronic devices, and renewable energy storage systems; therefore, the importance of battery state diagnostic technologies for improving battery performance and reliability is growing.

[0007] In particular, with the increasing demand for cost-effective battery cells, cost-effective battery cell condition diagnostic technologies are attracting attention. These technologies can possess unique characteristics that distinguish them from other battery cell condition diagnostic technologies. Cost-effective battery cell diagnostic technologies are being developed that control charging based on the condition of the battery cells, thereby improving battery reliability. Summary of the Invention

[0008] Technical issues

[0009] The embodiments disclosed herein relate to providing a battery diagnostic device and method for identifying the charge capacity of a battery cell that includes lithium iron phosphate (LFP) as the cathode material.

[0010] The embodiments disclosed herein relate to providing a battery diagnostic device and method for improving the accuracy of identifying the charging capacity of battery cells that include LFP as the positive electrode material.

[0011] The embodiments disclosed herein relate to providing a battery diagnostic device and method for controlling charging and discharging rates based on the charging capacity of individual battery cells.

[0012] The embodiments disclosed herein relate to providing a battery diagnostic device and method for improving the stability of a battery cell by controlling the charging and discharging rates according to the charging capacity of the battery cell.

[0013] The technical problems addressed in this disclosure are not limited to those mentioned above, and other purposes not mentioned will be clearly understood by those skilled in the art based on the following description.

[0014] Technical solution

[0015] A battery diagnostic device according to an embodiment of the present disclosure may include: a memory storing at least one instruction; and at least one processor executing at least one instruction.

[0016] According to an embodiment, at least one processor may be configured to: execute a charging process in which a charging segment and a first rest segment at a specific charging rate are alternately repeated for a battery cell, or execute a discharging process in which a discharging segment and a second rest segment at a specific discharging rate are alternately repeated for a battery cell; acquire the resistance of a battery cell while executing the charging or discharging process; and diagnose the charging capacity of a battery cell based on the resistance of the battery cell.

[0017] According to an embodiment, at least one processor can be configured to acquire the resistance of a battery cell based on the difference between the voltage of the battery cell in the charging section and the voltage of the battery cell in the first rest section, and the current of the battery cell in the charging section, when acquiring the resistance of a battery cell while performing a charging process.

[0018] According to an embodiment, at least one processor can be configured to acquire the resistance of a battery cell based on the difference between the voltage of the battery cell in the discharge segment and the voltage of the battery cell in the second rest segment, as well as the current of the battery cell in the discharge segment, when acquiring the resistance of a battery cell while performing a discharge process.

[0019] According to an embodiment, at least one processor can be configured to diagnose the charging capacity of a battery cell based on the relationship between the resistance of a reference battery cell (different from the battery cell) and the charging capacity of the reference battery cell.

[0020] According to an embodiment, at least one processor can be configured to diagnose the charging capacity of a battery cell based on a relationship corresponding to at least one of the following: battery cell temperature, a specific charging rate, a specific discharging rate, battery cell life state, or any combination thereof.

[0021] According to an embodiment, at least one processor can be configured to acquire the resistance of a battery cell while performing the charging process, when the charging rate of a battery cell is contained within a specified charging rate range for a specified time or longer.

[0022] According to an embodiment, at least one processor can be configured to acquire the resistance of a battery cell while performing a discharge process, when the discharge rate of a battery cell is contained within a specified discharge rate range for a predetermined time or longer.

[0023] According to an embodiment, the positive electrode of a battery cell may include lithium iron phosphate (LFP).

[0024] The battery diagnostic method according to embodiments of the present disclosure may include: performing a charging process in which a charging segment and a first rest segment at a specific charging rate are alternately repeated for a battery cell, or performing a discharging process in which a discharging segment and a second rest segment at a specific discharging rate are alternately repeated for a battery cell; acquiring the resistance of the battery cell while performing the charging or discharging process; and diagnosing the charging capacity of the battery cell based on the resistance of the battery cell.

[0025] According to an embodiment, obtaining the resistance of a battery cell while performing a charging or discharging process may include: when obtaining the resistance of a battery cell while performing a charging process, obtaining the resistance of the battery cell based on the difference between the voltage of the battery cell in the charging section and the voltage of the battery cell in the first rest section, and the current of the battery cell in the charging section.

[0026] According to an embodiment, obtaining the resistance of a battery cell while performing a charging or discharging process may include: when obtaining the resistance of a battery cell while performing a discharging process, obtaining the resistance of the battery cell based on the difference between the voltage of the battery cell in the discharging segment and the voltage of the battery cell in the second rest segment, and the current of the battery cell in the discharging segment.

[0027] According to an embodiment, diagnosing the charging capacity of a battery cell based on its resistance may include diagnosing the charging capacity of the battery cell based on the relationship between the resistance of a reference battery cell (different from the battery cell) and the charging capacity of the reference battery cell.

[0028] According to an embodiment, diagnosing the charging capacity of a battery cell based on the relationship between the resistance of a reference battery cell different from the battery cell and the charging capacity of the reference battery cell may include diagnosing the charging capacity of the battery cell based on a relationship corresponding to at least one of the following: the battery cell's temperature, a specific charging rate, a specific discharging rate, the battery cell's life state, or any combination thereof.

[0029] According to an embodiment, obtaining the resistance of a battery cell while performing a charging or discharging process may include: obtaining the resistance of a battery cell while performing a charging process when the charging rate of the battery cell can be contained within a specified charging rate range for a specified time or longer.

[0030] According to an embodiment, obtaining the resistance of a battery cell while performing a charging or discharging process may include: obtaining the resistance of a battery cell while performing a discharging process when the discharge rate of the battery cell is contained within a specified discharge rate range for a predetermined time or longer.

[0031] According to an embodiment, the positive electrode of a battery cell may include lithium iron phosphate (LFP).

[0032] Beneficial effects

[0033] This technology can identify the charging capacity of battery cells that use lithium iron phosphate (LFP) as the cathode material.

[0034] Furthermore, this technology can improve the accuracy of identifying the charging capacity of battery cells that use LFP as the cathode material.

[0035] Furthermore, this technology can control the charging and discharging rates based on the charging capacity of individual battery cells.

[0036] Furthermore, this technology can improve the stability of battery cells by controlling the charging and discharging rates according to the charging capacity of the individual cells.

[0037] In addition, various effects that can be directly or indirectly identified through this disclosure may be provided. Attached Figure Description

[0038] Figure 1 This is a block diagram illustrating a battery pack in a battery diagnostic device and battery diagnostic method according to embodiments of the present disclosure.

[0039] Figure 2 This is a block diagram illustrating the configuration of the battery diagnostic device in a battery diagnostic device and battery diagnostic method according to embodiments of the present disclosure.

[0040] Figure 3 An example of a graph showing the voltage of a battery cell based on the charging capacity of a battery cell using lithium iron phosphate (LFP) as the positive electrode material is shown in the battery diagnostic apparatus and battery diagnostic method according to embodiments of the present disclosure.

[0041] Figure 4 An example of a graph showing the current of a single battery cell during a charging or discharging process in a battery diagnostic device and method according to embodiments of the present disclosure is shown.

[0042] Figure 5 An example of a graph showing the voltage of a battery cell based on the charging capacity of each identified battery cell for a plurality of charging rates is shown in a battery diagnostic device and battery diagnostic method according to embodiments of the present disclosure.

[0043] Figure 6 An example of the operation flow of a battery diagnostic device that diagnoses charging capacity based on a process determined during a charging or discharging process is shown in an embodiment of the present disclosure.

[0044] Figure 7 An example of the operation flow of a battery diagnostic device for diagnosing the charging capacity of a single battery cell is shown in the battery diagnostic device and battery diagnostic method according to embodiments of the present disclosure.

[0045] Figure 8 This is a block diagram illustrating the hardware configuration of a computing system for performing a battery diagnostic method in a battery diagnostic device and battery diagnostic method according to embodiments of the present disclosure. Detailed Implementation

[0046] In the following description, some embodiments disclosed herein are described with reference to the accompanying drawings, which illustrate various embodiments of this disclosure. However, this is not intended to limit the technology to the particular embodiments, and will be understood to include various modifications, equivalents, and / or alternatives to the embodiments of the technology.

[0047] When adding reference numerals to components in each figure, care should be taken to give the same reference numerals to the same components whenever possible, even if they are shown in different figures. Furthermore, in describing the various embodiments disclosed herein, detailed descriptions of related known configurations or functions are omitted when it is determined that such detailed descriptions hinder understanding of the embodiments of the invention. It should be understood that the singular form of nouns corresponding to items can include one or more things, unless the relevant context clearly indicates otherwise.

[0048] Furthermore, in describing components of embodiments of this disclosure, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are used only to distinguish the component from other components, and the nature, order, or sequence of the components may not be limited by these terms. Moreover, 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, such as those defined in common dictionaries, should be interpreted as having meaning consistent with their meaning in the context of the relevant art, and unless expressly defined herein, will not be construed as having an idealized or overly formal meaning.

[0049] Furthermore, in this disclosure, the expressions "greater than" or "less than" may be used to determine whether a particular condition is met or achieved, but these are merely illustrative descriptions and do not exclude descriptions of "equal to or greater than" or "less than or equal to". A condition described as "equal to or greater than" 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 "equal to or greater than 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 of A) to B (inclusive of B).

[0050] In this disclosure, 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” or “at least one of A, B or C” may include any one of the items listed in the phrase or all possible combinations of the phrases.

[0051] In this specification, it should be understood that if an element (e.g., a first element) is referred to as "connected to," "coupled to," or "in contact with" another element (e.g., a second element) with or without the terms "operationally" or "communically," it means that the element can be connected to the other element directly (e.g., via wired or wireless) or via a third element.

[0052] According to embodiments, methods according to various embodiments disclosed herein can be included and provided 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 storage medium (e.g., an optical disc read-only memory (CD-ROM)), or distributed online via an app store (e.g., downloaded or uploaded), or directly between two user devices. If distributed online, at least a portion of the computer program product can be temporarily generated or at least temporarily stored in a machine-readable storage medium, such as the memory of a manufacturer's server, an app store's server, or a relay server.

[0053] According to various embodiments, each component (e.g., a module or program) described may include a single entity or multiple entities, and some of the multiple entities may be configured separately from the other components. According to various embodiments, at least one of the aforementioned components may be omitted, or at least one of other components 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 still perform at least one function of each of the multiple components in the same or similar manner as if the function had been performed by a corresponding component of the multiple components prior to integration. According to various embodiments, operations performed by a module, program, or other component may be performed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be performed in a different order or omitted, or at least one of other operations may be added.

[0054] In the following text, reference will be made to Figures 1 to 8 The embodiments of this disclosure are described in detail.

[0055] Figure 1 This is a block diagram illustrating a battery pack in a battery diagnostic device and battery diagnostic method according to embodiments of the present disclosure.

[0056] refer to Figure 1 The battery pack 1 may include individual 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 individual battery cells 12, sensor units 14, switching units 16, and battery management systems 20.

[0057] 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 an electric vehicle (EV) or an energy storage system (ESS), but is not limited thereto.

[0058] 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 with electrical energy. For example, the battery cell 10 may be a lithium-ion (Li-ion) battery, a lithium-ion (Li-ion) polymer battery, a nickel-cadmium (Ni-Cd) battery, a nickel-metal hydride (Ni-MH) battery, etc., and may not be limited to these.

[0059] According to embodiments, multiple battery cells 12 can be connected in series or in parallel. For example, a battery cell 12 can be a battery module, a battery bank, or a collection of battery cells (cell-to-group structure).

[0060] According to an embodiment, sensor unit 14 can acquire information related to battery cell 12. According to an embodiment, sensor unit 14 can acquire values ​​(or information) related to the state of each of battery cell 12 or battery cell 10. In an embodiment, the state-related values ​​may include at least one value of the battery cell's voltage, current, resistance, state of charge (SOC), state of health (SOH), or temperature, or combinations thereof.

[0061] According to an embodiment, sensor unit 14 can provide information about each of the plurality of battery cells 12 to battery management system 20.

[0062] According to an embodiment, the switching unit 16 may include a device for controlling the current for charging or discharging the battery cell 12. For example, depending on the specifications of the battery pack 1, the switching unit 16 may include at least one relay and / or magnetic contactor.

[0063] According to an 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 may be an interface for receiving values ​​obtained by measuring the various parameters mentioned above, and may include multiple terminals, circuitry connected to the terminals to process the input values, etc. Furthermore, the battery management system 20 can control the sensor unit 14 and / or the switching unit 16. For example, the battery management system 20 may be connected to multiple battery cells 12 to monitor the state of each of the multiple battery cells 12 and control the on / off state of relays, contactors, etc.

[0064] According to an embodiment, the operation of the battery management system 20 can be performed by the BMS (Battery Management System) in the vehicle and by various devices such as servers, cloud, chargers, dischargers, etc.

[0065] The upper-level controller 2 can send control signals for 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 received from the upper-level controller 2.

[0066] According to an embodiment, the battery management system 20 may include Figure 2 The battery diagnostic device 201 is included. In another embodiment, the battery management system 20 can be integrated with... Figure 2 The battery diagnostic equipment in 201 is from different systems. That is to say, Figure 2The battery diagnostic device 201 can be included in the battery pack 1 or configured as another device outside the battery pack 1. For ease 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 described below can be performed by the battery management system (BMS) in the vehicle and by various devices such as servers, cloud, chargers, dischargers, etc.

[0067] Figure 2 This is a block diagram illustrating the configuration of the battery diagnostic device in a battery diagnostic device and battery diagnostic method according to embodiments of the present disclosure.

[0068] Figure 3 An example of a graph showing the voltage of a battery cell based on the charging capacity of a battery cell using lithium iron phosphate (LFP) as the positive electrode material is shown in the battery diagnostic apparatus and battery diagnostic method according to embodiments of the present disclosure.

[0069] Figure 4 An example of a graph showing the current of a single battery cell during a charging or discharging process in a battery diagnostic device and method according to embodiments of the present disclosure is shown.

[0070] refer to Figure 2 , Figure 3 and Figure 4 The 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.

[0071] The first curve 301 can represent the voltage of a battery cell based on the charging capacity of a battery cell using LFP as the positive electrode material. The first line 303 can represent the voltage of a battery cell based on the charging capacity measured when the battery cell is being charged. The second line 305 can represent the voltage of a battery cell based on the charging capacity measured when the battery cell is being discharged. The first segment 307 can represent a segment where the voltage change of the battery cell is less than a specified voltage change even when the charging capacity of the battery cell changes.

[0072] The second curve 401 can represent the current of a single battery cell over time during the charging or discharging process. The third line 403 can represent the current of a single battery cell over time.

[0073] In this disclosure, the charging capacity of a single battery cell can be expressed as the state of charge (SOC), which is the charged capacity of the battery cell. The charging capacity of a single battery cell represents the ratio of its remaining capacity to its fully charged capacity, and can be expressed as a value between 0 and 1 or between 0% and 100%. Methods such as ampere counting, open-circuit voltage (OCV)-SOC curves, and Kalman filters can be used to determine the charging capacity, but embodiments of this disclosure are not limited to these.

[0074] When the measurement accuracy of the charging capacity of a battery cell is lower than the specified accuracy, the battery cell may be overcharged or over-discharged, which may cause damage, and the life of the battery cell may be shortened due to the damage to the battery cell.

[0075] Furthermore, when the measurement accuracy of the charging capacity of a battery cell is lower than the specified accuracy, some battery cells may continue to operate under load, an imbalance may occur between some battery cells, or the electrolyte within some battery cells may decompose.

[0076] Furthermore, when the measurement accuracy of the charging capacity of a battery cell is lower than the specified accuracy, the thermal management system may not be able to operate correctly based on the charging capacity of the battery cell, resulting in a deterioration in the reliability of the battery cell.

[0077] Therefore, in terms of the stability and reliability of individual battery cells, it may be necessary to maintain the measurement accuracy of the charging capacity of individual battery cells at a level higher than the specified accuracy.

[0078] At least one processor 205 of the battery diagnostic device 201 can typically diagnose the charging capacity of a battery cell based on its voltage. However, for battery cells that use LFP as the positive electrode material, it may be difficult to diagnose the charging capacity based on voltage variations, as shown in the first curve 301. This is because even when the charging capacity of a battery cell varies within a specific range, the voltage variation of the battery cell may be less than a specified voltage variation.

[0079] In other words, in the first segment 307 of the first line 303 indicating the voltage of the battery cell based on the charging capacity of the battery cell measured when the battery cell is being charged and the second line 305 indicating the voltage of the battery cell based on the charging capacity of the battery cell measured when the battery cell is being discharged, the voltage change of the battery cell may be less than the specified voltage change even when the charging capacity of the battery cell changes.

[0080] According to an embodiment, at least one processor 205 of the battery diagnostic device 201 can identify the charging capacity of a battery cell based on the resistance of the battery cell, which includes LFP as the positive electrode material.

[0081] According to an embodiment, at least one processor 205 of the battery diagnostic device 201 can acquire the resistance of a single battery cell while performing a charging or discharging process.

[0082] According to an embodiment, the charging process may include a process in which a specific charging rate is alternately repeated for each battery cell in the second graph 401, and a first resting period is also repeated. For the charging process, the third line 403 may represent the charging current of the battery cell over time, the second segment 405 may represent the charging segment, and the third segment 407 may represent the first resting period.

[0083] According to an embodiment, when the resistance of a battery cell is acquired while performing a charging process, at least one processor 205 of the battery diagnostic device 201 can acquire the resistance of a battery cell based on the difference between the voltage of a battery cell in a charging section (e.g., the second section 405) and the voltage of a battery cell in a first rest section (e.g., the third section 407) and the current of the battery cell in the charging section.

[0084] According to an embodiment, the discharge process may include a process in which a specific discharge rate is alternately repeated for a single battery cell in a second graph 401, with a discharge segment and a second rest segment. For the discharge process, a third line 403 may represent the discharge current of a single battery cell over time, a second segment 405 may represent a discharge segment, and a third segment 407 may represent a second rest segment.

[0085] According to an embodiment, when acquiring the resistance of a battery cell while performing a discharge process, at least one processor 205 of the battery diagnostic device 201 can acquire the resistance of a battery cell based on the difference between the voltage of a battery cell in a discharge segment (e.g., the second segment 405) and the voltage of a battery cell in a second rest segment (e.g., the third segment 407) and the current of the battery cell in the discharge segment.

[0086] Figure 5 An example of a graph showing the voltage of a battery cell based on the charging capacity of each identified battery cell for a plurality of charging rates is shown in a battery diagnostic device and battery diagnostic method according to embodiments of the present disclosure.

[0087] refer to Figure 5Graph 501 can represent the resistance based on the charging capacity of a single battery cell. First line 503 can represent the resistance of a first reference battery cell based on the charging capacity of a first reference battery cell using LFP as the positive electrode material. Second line 505 can represent the resistance of a second reference battery cell based on the charging capacity of a second reference battery cell using LFP as the positive electrode material. Third line 507 can represent the resistance of a comparison battery cell based on the charging capacity of comparison battery cells using lithium, nickel, cobalt, and manganese as positive electrode materials. Point 509 can represent the measured resistance of a battery cell and the charging capacity of the battery cell based on that resistance.

[0088] According to an embodiment, at least one processor 205 of the battery diagnostic device 201 can diagnose the charging capacity of a battery cell based on the relationship between the resistance of a reference battery cell and the charging capacity of the reference battery cell.

[0089] According to embodiments, the first reference battery cell and the second reference battery cell may be different from the battery cell itself. The resistance of a reference battery cell can be identified based on the resistance of each of the plurality of reference battery cells. For example, the resistance of a reference battery cell may include the average of the resistances of the first reference battery cell and the second reference battery cell. For example, the resistance of a reference battery cell may include either the resistance of the first reference battery cell or the resistance of the second reference battery cell. However, embodiments of this disclosure are not limited thereto.

[0090] According to an embodiment, at least one processor 205 of the battery diagnostic device 201 can diagnose the charging capacity of a battery cell by substituting the resistance of the battery cell into the relationship between the resistance of a reference battery cell and the charging capacity of the reference battery cell (as shown in graph 501).

[0091] According to an embodiment, when the resistance value of a battery cell at point 509 is measured to be approximately 30Ω, at least one processor 205 of the battery diagnostic device 201 can diagnose the charging capacity of the battery cell as approximately 41% based on the relationship between the resistance of the reference battery cell and the charging capacity of the reference battery cell.

[0092] Referring to line 507, when comparing individual battery cells, it may be difficult to diagnose their charging capacity based on their resistance. This is because even when the resistance of a battery cell varies within a specific range, the change in its charging capacity is less than the specified capacity change.

[0093] According to an embodiment, at least one processor 205 of the battery diagnostic device 201 can diagnose the charging capacity of a battery cell based on a relationship between the resistance of a reference battery cell and the charging capacity of the reference battery cell, corresponding to at least one of the following: the temperature of the battery cell, a specific charging rate, a specific discharging rate, the life state of the battery cell, or any combination thereof.

[0094] For example, when acquiring the resistance of a battery cell while performing the charging process, at least one processor 205 of the battery diagnostic device 201 can diagnose the charging capacity of a battery cell based on the relationship between the resistance of a reference battery cell and the charging capacity of a reference battery cell and at least one of the following: the temperature of the battery cell, the charging rate of the battery cell in the charging section, the life state of the battery cell, or any combination thereof.

[0095] For example, when acquiring the resistance of a battery cell while performing a discharge process, at least one processor 205 of the battery diagnostic device 201 can diagnose the charging capacity of a battery cell based on a relationship between the resistance of a reference battery cell and the charging capacity of a reference battery cell, and at least one of the following: the temperature of the battery cell, the discharge rate of the battery cell in the discharge segment, the life state of the battery cell, or any combination thereof.

[0096] According to an embodiment, at least one processor 205 of the battery diagnostic device 201 can acquire the resistance of a battery cell while performing the charging process, when the charging rate of a battery cell is within a specified charging rate range for a specified time or longer, and diagnose the charging capacity of the battery cell based on the resistance of the battery cell. However, embodiments of this disclosure are not limited to this.

[0097] According to an embodiment, at least one processor 205 of the battery diagnostic device 201 can acquire the resistance of a battery cell while performing a discharge process when the discharge rate of a battery cell is contained within a specified discharge rate range for a predetermined time or longer, and diagnose the charging capacity of the battery cell based on the resistance of the battery cell. However, embodiments of this disclosure are not limited to this.

[0098] For example, since the charging rate of a battery cell included in a vehicle can be contained within a specified charging rate range for a specified time or longer, but the discharging rate of a battery cell included in a vehicle cannot be contained within a specified discharging rate range for a predetermined time or longer, at least one processor 205 of the battery diagnostic device 201 can acquire the resistance of the battery cell while performing the charging process. However, embodiments of this disclosure are not limited to this.

[0099] For example, since the charging rate of a battery cell included in an energy storage system (ESS) cannot be contained within a specified charging rate range for a specified time or longer, but the discharging rate of a battery cell included in the ESS can be contained within a specified discharging rate range for a predetermined time or longer, at least one processor 205 of the battery diagnostic device 201 can acquire the resistance of the battery cell while performing the discharging process. However, embodiments of this disclosure are not limited to this.

[0100] Figure 6 An example of the operation flow of a battery diagnostic device that diagnoses charging capacity based on a process determined during a charging or discharging process is shown in an embodiment of the present disclosure.

[0101] In the following text, it is assumed that the following are included Figure 2 At least one processor 205 in the battery diagnostic device 201 performs Figure 6 The process. Additionally, in Figure 6 As can be understood from the description, the operations described as being performed by the battery diagnostic device 201 are controlled by at least one processor 205 included in the battery diagnostic device 201.

[0102] refer to Figure 6 In the first operation 601, at least one processor 205 of the battery diagnostic device 201 can determine whether to identify the resistance of a battery cell while performing the charging process or while performing the discharging process.

[0103] In the second operation 603, at least one processor 205 of the battery diagnostic device 201 can identify the resistance of a single battery cell while performing a charging or discharging process.

[0104] In the third operation 605, at least one processor 205 of the battery diagnostic device 201 can diagnose the charging capacity based on the relationship between the resistance of a reference battery cell and the charging capacity of a reference battery cell, as well as the resistance of the battery cell.

[0105] Figure 7 An example of the operation flow of a battery diagnostic device for diagnosing the charging capacity of a single battery cell is shown in the battery diagnostic device and battery diagnostic method according to embodiments of the present disclosure.

[0106] In the following text, it is assumed that the following are included Figure 2 At least one processor 205 in the battery diagnostic device 201 performs Figure 7 The process. Additionally, in Figure 7 As can be understood from the description, the operations described as being performed by the battery diagnostic device 201 are controlled by at least one processor 205 included in the battery diagnostic device 201.

[0107] In the first operation 701, at least one processor 205 of the battery diagnostic device 201 may execute a charging process in which a charging segment and a first rest segment of a specific charging rate are alternately repeated for a single battery cell, or may execute a discharging process in which a discharging segment and a second rest segment of a specific discharging rate are alternately repeated.

[0108] In the second operation 703, at least one processor 205 of the battery diagnostic device 201 can acquire the resistance of a single battery cell while performing a charging or discharging process.

[0109] In the third operation 705, at least one processor 205 of the battery diagnostic device 201 can diagnose the charging capacity of a battery cell based on the resistance of the battery cell.

[0110] Figure 8 This is a block diagram illustrating the hardware configuration of a computing system for performing a battery diagnostic method in a battery diagnostic device and battery diagnostic method according to embodiments of the present disclosure.

[0111] refer to Figure 8 The computing system 800 according to the embodiments disclosed herein may include a microcontroller unit (MCU) 810, a memory 820, an input / output interface (I / F) 830, and a communication I / F 840.

[0112] The MCU 810 can be one or more processors that execute various programs stored in the memory 820 (e.g., battery cell data collection programs, graph generation programs, data analysis programs, data decomposition algorithms, normalization programs, battery cell diagnostic programs, etc.). These programs process various information, including battery cell characteristic data and latent variables, and execute the aforementioned... Figures 2 to 7 The battery diagnostic device 201 shown in the figure has the following functions.

[0113] The memory 820 can store various programs such as battery cell data collection programs, curve generation programs, data analysis programs, data decomposition algorithms, normalization programs, battery cell diagnostic programs, etc.

[0114] Multiple memories 820 can be provided as needed. Memory 820 can be volatile or non-volatile memory. As volatile memory, memory 820 can be random access memory (RAM), dynamic RAM (DRAM), static RAM (SRAM), etc. As non-volatile memory, memory 820 can be read-only memory (ROM), programmable ROM (PROM), electrically modifiable ROM (EAROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, etc. The examples of memory 820 listed above are merely exemplary and are not limited to these examples.

[0115] The Input / Output I / F 830 provides an interface that enables the sending and receiving of data by connecting input devices (not shown) such as a keyboard, mouse, or touch panel and output devices (not shown) such as a display and MCU 810.

[0116] The communication I / F 840 is a component capable of sending and receiving various types of data with and from a server, and can be any device capable of supporting wired or wireless communication. For example, the battery diagnostic device 201 can send various types of information, including shape models of battery cells, to a separately provided external server via the communication I / F 840, and receive various types of information, including shape models of battery cells, from the separately provided external server.

[0117] By recording in memory 820 in this manner and processing by MCU 810, a computer program according to the embodiments disclosed herein can be implemented, for example, to execute... Figure 2 Each of the modules in the functions shown is represented by a module.

[0118] Although all components constituting the embodiments disclosed herein have been described as being combined or operated in combination, the embodiments disclosed herein are not necessarily limited to these embodiments. That is, within the scope of the purpose of the embodiments disclosed herein, all components may be selectively combined and operated once or multiple times.

[0119] Unless otherwise stated, the foregoing terms such as “comprising,” “including,” or “having” mean that the corresponding component may be present, and therefore should be understood as potentially including other components rather than excluding them. 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 herein pertain. Commonly used terms (such as those defined in dictionaries) should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and will not be construed as having an idealized or overly formal meaning unless expressly defined herein.

[0120] 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 other structures to achieve the same purposes or advantages as 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 herein without departing from the scope of this disclosure.

Claims

1. A battery diagnostic device, comprising: The memory stores at least one instruction; as well as At least one processor, wherein the at least one processor executes the at least one instruction. Wherein, the at least one processor is configured to: The process can be either a charging process in which a charging segment and a first rest segment are alternately repeated for a specific charging rate for a single battery cell, or a discharging process in which a discharging segment and a second rest segment are alternately repeated for the same battery cell. The resistance of the individual battery cells is obtained while performing the charging or discharging process; and The charging capacity of a battery cell is diagnosed based on its resistance.

2. The battery diagnostic device according to claim 1, wherein, The at least one processor is configured to acquire the resistance of the battery cell based on the difference between the voltage of the battery cell in the charging segment and the voltage of the battery cell in the first rest segment, and the current of the battery cell in the charging segment, when acquiring the resistance of the battery cell while performing the charging process.

3. The battery diagnostic device according to claim 1, wherein, The at least one processor is configured to acquire the resistance of the battery cell based on the difference between the voltage of the battery cell in the discharge segment and the voltage of the battery cell in the second rest segment, and the current of the battery cell in the discharge segment, when acquiring the resistance of the battery cell while performing the discharge process.

4. The battery diagnostic device according to claim 1, wherein, The at least one processor is configured to diagnose the charging capacity of the battery cell based on the relationship between the resistance of a reference battery cell (different from the battery cell) and the charging capacity of the reference battery cell.

5. The battery diagnostic device according to claim 4, wherein, The at least one processor is configured to diagnose the charging capacity of the battery cell based on a relationship corresponding to at least one of the following: the temperature of the battery cell, the specific charging rate, the specific discharging rate, the life state of the battery cell, or any combination thereof.

6. The battery diagnostic device according to claim 1, wherein, The at least one processor is configured to acquire the resistance of the battery cell while performing the charging process, when the charging rate of the battery cell is contained within a specified charging rate range for a specified time or longer.

7. The battery diagnostic device according to claim 1, wherein, The at least one processor is configured to acquire the resistance of the battery cell while performing the discharge process, when the discharge rate of the battery cell is contained within a specified discharge rate range for a predetermined time or longer.

8. The battery diagnostic device according to claim 1, wherein, The positive electrode of the battery cell includes lithium iron phosphate (LFP).

9. A battery diagnostic method, comprising: The process can be either a charging process in which a charging segment and a first rest segment are alternately repeated for a specific charging rate for a single battery cell, or a discharging process in which a discharging segment and a second rest segment are alternately repeated for the same battery cell. The resistance of the individual battery cell is obtained while the charging or discharging process is being performed; as well as The charging capacity of a battery cell is diagnosed based on its resistance.

10. The battery diagnostic method according to claim 9, wherein, Acquiring the resistance of a single battery cell while performing the charging or discharging process includes: when acquiring the resistance of a single battery cell while performing the charging process, acquiring the resistance of the single battery cell based on the difference between the voltage of the single battery cell in the charging segment and the voltage of the single battery cell in the first rest segment, and the current of the single battery cell in the charging segment.

11. The battery diagnostic method according to claim 9, wherein, Acquiring the resistance of a single battery cell while performing the charging or discharging process includes: when acquiring the resistance of a single battery cell while performing the discharging process, acquiring the resistance of the single battery cell based on the difference between the voltage of the single battery cell in the discharging segment and the voltage of the single battery cell in the second rest segment, and the current of the single battery cell in the discharging segment.

12. The battery diagnostic method according to claim 9, wherein, Diagnosing the charging capacity of a battery cell based on its resistance includes diagnosing the charging capacity of the battery cell based on the relationship between the resistance of a reference battery cell (different from the battery cell) and the charging capacity of the reference battery cell.

13. The battery diagnostic method according to claim 12, wherein, Diagnosing the charging capacity of a battery cell based on the relationship between the resistance of a reference battery cell (different from the battery cell) and the charging capacity of the reference battery cell includes: diagnosing the charging capacity of the battery cell based on a relationship corresponding to at least one of the battery cell's temperature, the specific charging rate, the specific discharging rate, the battery cell's lifespan state, or any combination thereof.

14. The battery diagnostic method according to claim 9, wherein, Acquiring the resistance of a single battery cell while performing the charging or discharging process includes: acquiring the resistance of the single battery cell while performing the charging process when the charging rate of the single battery cell can be contained within a specified charging rate range for a specified time or longer.

15. The battery diagnostic method according to claim 9, wherein, Acquiring the resistance of a single battery cell while performing the charging or discharging process includes: acquiring the resistance of the single battery cell while performing the discharging process when the discharge rate of the single battery cell is contained within a specified discharge rate range for a predetermined time or longer.

16. The battery diagnostic method according to claim 9, wherein, The positive electrode of the battery cell includes lithium iron phosphate (LFP).

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