Battery diagnostic apparatus and method thereof

Abstract

This battery diagnostic apparatus comprises a memory for storing at least one instruction and at least one processor that executes the at least one instruction, wherein the at least one processor may: execute a charging process in which a charging period at a specific charging rate for a battery cell and a first rest period are alternately repeated or execute a discharging process in which a discharging period at a specific discharging rate for the battery cell and a second rest period are alternately repeated; acquire the resistance of the battery cell during the execution of the charging process or the discharging process; and diagnose the charging capacity of the battery cell on the basis of the resistance of the battery cell.

Description

Battery diagnostic device and method thereof

[0001] Cross-citation with related applications

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

[0003] Technology field

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

[0005] Recently, research and development on secondary batteries has been actively underway. Here, secondary batteries are defined as rechargeable and dischargeable batteries, encompassing both conventional Ni / Cd and Ni / MH batteries, as well as more recent lithium-ion batteries. Recently, their use has expanded to include power sources for electric vehicles, attracting attention as a next-generation energy storage medium.

[0006] With the proliferation of various electronic devices driven by the Fourth Industrial Revolution, battery usage is rapidly increasing. Batteries are emerging as an essential energy source in various fields, including 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 increasing.

[0007] In particular, with the increasing demand for cost-effective battery cells, technologies for diagnosing the condition of cost-effective battery cells are attracting attention. This technology may have unique characteristics that differentiate it from other battery cell condition diagnosis technologies. By developing cost-effective battery cell diagnosis technologies and controlling charging based on the condition of the battery cells, battery reliability can be improved.

[0008] According to embodiments disclosed in this document, it is intended to provide a battery diagnostic device and method for identifying a charge capacity of a battery cell including lithium iron phosphate (LFP) as a cathode material.

[0009] According to embodiments disclosed in this document, it is an object to provide a battery diagnostic device and method for improving the accuracy of identifying the charge capacity of a battery cell including LFP as a cathode material.

[0010] According to the embodiments disclosed in this document, it is intended to provide a battery diagnostic device and method for controlling a charging and discharging speed according to the charging capacity of a battery cell.

[0011] According to embodiments disclosed in this document, it is an object to provide a battery diagnostic device and method for improving the stability of a battery cell by controlling the charging and discharging speed according to the charging capacity of the battery cell.

[0012] The technical challenges of this document are not limited to the technical challenges mentioned above, and other technical challenges not mentioned will be clearly understood by those skilled in the art from the descriptions below.

[0013] A battery diagnostic device according to one embodiment of the present document may include a memory storing at least one instruction, and at least one processor executing the at least one instruction.

[0014] According to one embodiment, the at least one processor may execute a charging process in which a charging period at a specific charging rate and a first rest period are alternately repeated for the battery cell, or execute a discharging process in which a discharging period at a specific discharging rate and a second rest period are alternately repeated for the battery cell, and in the process of executing the charging process or the discharging process, the resistance of the battery cell may be acquired, and based on the resistance of the battery cell, the charge capacity of the battery cell may be diagnosed.

[0015] According to one embodiment, when the at least one processor obtains the resistance of the battery cell during the process of executing the charging process, the resistance of the battery cell may be obtained based on a difference between the voltage of the battery cell in the charging section and the voltage of the battery cell in the first idle section, and a current of the battery cell in the charging section.

[0016] According to one embodiment, when the at least one processor obtains the resistance of the battery cell during the process of executing the discharging process, the resistance of the battery cell can be obtained based on a difference between the voltage of the battery cell in the discharging section and the voltage of the battery cell in the second resting section, and the current of the battery cell in the discharging section.

[0017] According to one embodiment, the at least one processor can diagnose the charge capacity of the battery cell based on a relationship between a resistance of a reference battery cell different from the battery cell and a charge capacity of the reference battery cell.

[0018] According to one embodiment, the at least one processor can diagnose the charge capacity of the battery cell based on the relationship corresponding to at least one of a temperature of the battery cell, the specific charge rate, the specific discharge rate, the state of life of the battery cell, or any combination thereof.

[0019] According to one embodiment, the at least one processor may obtain the resistance of the battery cell during the process of executing the charging process, if the charging rate of the battery cell can be included in a specified charging rate range for a specified time or longer.

[0020] According to one embodiment, the at least one processor may obtain the resistance of the battery cell during the process of executing the discharge process, if the discharge rate of the battery cell can be included in a designated discharge rate range for a predetermined time or longer.

[0021] According to one embodiment, the positive electrode of the battery cell may include lithium iron phosphate (LFP).

[0022] A battery diagnosis method according to one embodiment of the present document may include an operation of executing a charging process in which a charging section at a specific charging rate and a first resting section are alternately repeated for a battery cell, or an operation of executing a discharging process in which a discharging section at a specific discharging rate and a second resting section are alternately repeated for the battery cell, an operation of obtaining a resistance of the battery cell during the course of executing the charging process or the discharging process, and an operation of diagnosing a charge capacity of the battery cell based on the resistance of the battery cell.

[0023] According to one embodiment, in the process of executing the charging process or the discharging process, the operation of obtaining the resistance of the battery cell may include an operation of obtaining the resistance of the battery cell based on a 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 a current of the battery cell in the charging section when obtaining the resistance of the battery cell in the process of executing the charging process.

[0024] According to one embodiment, in the process of executing the charging process or the discharging process, the operation of obtaining the resistance of the battery cell may include an operation of obtaining the resistance of the battery cell based on a difference between the voltage of the battery cell in the discharging period and the voltage of the battery cell in the second rest period, and a current of the battery cell in the discharging period when obtaining the resistance of the battery cell in the process of executing the discharging process.

[0025] According to one embodiment, the operation of diagnosing the charge capacity of the battery cell based on the resistance of the battery cell may include the operation of diagnosing the charge capacity of the battery cell based on the relationship between the resistance of a reference battery cell different from the battery cell and the charge capacity of the reference battery cell.

[0026] According to one embodiment, the operation of diagnosing the charge capacity of the battery cell based on a relationship between the resistance of a reference battery cell different from the battery cell and the charge capacity of the reference battery cell may include an operation of diagnosing the charge capacity of the battery cell based on the relationship corresponding to at least one of a temperature of the battery cell, the specific charge rate, the specific discharge rate, the life state of the battery cell, or any combination thereof.

[0027] According to one embodiment, in the process of executing the charging process or the discharging process, the operation of obtaining the resistance of the battery cell may include an operation of obtaining the resistance of the battery cell in the process of executing the charging process, when the charging speed of the battery cell can be included in a specified charging speed range for a specified time or longer.

[0028] According to one embodiment, in the process of executing the charging process or the discharging process, the operation of obtaining the resistance of the battery cell may include an operation of obtaining the resistance of the battery cell in the process of executing the discharging process when the discharge rate of the battery cell can be included in a designated discharge rate range for a predetermined time or longer.

[0029] According to one embodiment, the positive electrode of the battery cell may include lithium iron phosphate (LFP).

[0030] The present technology can identify the charge capacity of a battery cell containing lithium iron phosphate (LFP) as a cathode material.

[0031] Additionally, the present technology can improve the accuracy of identifying the charge capacity of a battery cell containing LFP as a cathode material.

[0032] Additionally, the present technology can control the charging and discharging speed according to the charging capacity of the battery cell.

[0033] In addition, the present technology can improve the stability of a battery cell by controlling the charging and discharging speed according to the charging capacity of the battery cell.

[0034] In addition, various effects may be provided, either directly or indirectly, through this document.

[0035] FIG. 1 is a block diagram showing a battery pack in a battery diagnosis device and a battery diagnosis method according to one embodiment of the present document.

[0036] FIG. 2 is a block diagram showing the configuration of a battery diagnosis device and a battery diagnosis method according to one embodiment of the present document.

[0037] FIG. 3 illustrates an example of a graph showing the voltage of a battery cell according to the charge capacity of a battery cell using lithium iron phosphate (LFP) as a cathode material in a battery diagnosis device and a battery diagnosis method according to an embodiment of the present document.

[0038] FIG. 4 illustrates an example of a graph representing the current of a battery cell according to a charging process or a discharging process in a battery diagnostic device and a battery diagnostic method according to an embodiment of the present document.

[0039] FIG. 5 illustrates an example of a graph representing a voltage of a battery cell based on a charge capacity of a battery cell identified for each of a plurality of charge rates, in a battery diagnosis device and a battery diagnosis method according to one embodiment of the present document.

[0040] FIG. 6 illustrates an example of a flow of operations of a battery diagnostic device that diagnoses a charge capacity based on a process determined during a charging process or a discharging process, in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0041] FIG. 7 illustrates an example of a flow of operations of a battery diagnostic device for diagnosing a charge capacity of a battery cell in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0042] FIG. 8 is a block diagram showing the hardware configuration of a computing system that performs a battery diagnosis method in a battery diagnosis device and a battery diagnosis method according to one embodiment of the present document.

[0043] Hereinafter, some embodiments disclosed in this document are described with reference to the accompanying drawings, which illustrate various embodiments of this document. However, this is not intended to limit the present technology to specific embodiments, and it should be understood that various modifications, equivalents, and / or alternatives of the embodiments of this technology are included.

[0044] When assigning reference numerals to components in each drawing, it should be noted that identical components are assigned the same numerals whenever possible, even if they are shown in different drawings. Furthermore, when describing various embodiments disclosed in this document, if a detailed description of a related known configuration or function is deemed to hinder understanding of the embodiments of the present invention, the detailed description will be omitted. The singular form of a noun corresponding to an item may include one or more items, unless the context clearly indicates otherwise.

[0045] 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 only intended to distinguish the components from other components, and the nature, order, or sequence of the components may not be limited by the terms. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed in this document belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this application.

[0046] In addition, in the present disclosure, expressions such as "more than" or "less than" may be used to determine whether a specific condition is satisfied or fulfilled. However, this is merely a description for expressing an example and does not exclude descriptions such as "more than" or "less than." Conditions described as "more than" may be replaced with "more than," conditions described as "less than," and conditions described as "more than and less than" may be replaced with "more than and less than." In addition, hereinafter, "A" to "B" mean at least one of the elements from A (including A) to B (including B).

[0047] In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0048] In this document, when a component (e.g., a first component) is referred to as being “connected,” “coupled,” or “connected,” with or without the terms “functionally” or “communicatively,” or is referred to as being “coupled” or “connected,” it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0049] According to one embodiment, the method according to the various embodiments disclosed in the present document may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) 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 generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0050] According to various embodiments, each component (e.g., a module or a program) of the described components may include one or more entities, and some of the entities may be separated and arranged in other components. According to various embodiments, at least one of the components or operations of the aforementioned components may be omitted, or at least one other component or operation may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform at least one function of each of the plurality of components identically or similarly to that performed by the corresponding component among the plurality of components prior to integration. According to various embodiments, the 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.

[0051] Hereinafter, embodiments of the present document will be described in detail with reference to FIGS. 1 to 8.

[0052] FIG. 1 is a block diagram showing a battery pack in a battery diagnosis device and a battery diagnosis method according to one embodiment of the present document.

[0053] Referring to FIG. 1, a 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).

[0054] According to one embodiment, the battery unit (12) can supply power to a target device (not shown). To this end, the battery unit (12) can be electrically connected to the target device. Here, the target device can include an electrical, electronic, or mechanical device that operates by receiving power from the battery pack (1). For example, the target device can be, but is not limited to, an electric vehicle (EV) or an energy storage system (ESS).

[0055] According to one embodiment, the battery unit (12) may include at least one battery cell (10) that can be charged and discharged. Here, the battery cell (10) may be a basic unit of a battery cell that can charge and discharge electric energy and use it. 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-metal hydride (Ni-MH) battery, etc., but may not be limited thereto.

[0056] According to one embodiment, a plurality of battery units (12) may be connected in series or parallel. For example, the battery unit (12) may be a battery module, a battery bank, or a collection of battery cells (cell-to-pack structure).

[0057] 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 voltage, current, resistance, state of charge (SOC), state of health (SOH), or temperature of the battery cell, or a combination thereof.

[0058] According to one embodiment, the sensor unit (14) can provide information on each of the plurality of battery units (12) to the battery management system (20).

[0059] According to one embodiment, the switching unit (16) may include a device 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).

[0060] According to one embodiment, a battery management system (BMS) (20) may monitor voltage, current, temperature, etc. of the battery pack (1) to control or manage the battery pack (1) to prevent overcharge, overdischarge, etc. For example, the battery management system (20) may include a plurality of terminals as an interface for receiving values ​​measured from the various parameters described above, and a circuit connected to these terminals to process the input values. In addition, the battery management system (20) may control the sensor unit (14) and / or the 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 ON / OFF of a relay or a contactor, etc.

[0061] According to one embodiment, the operation of the battery management system (20) may 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.

[0062] The upper controller (2) can transmit control signals for multiple battery units (12) to the battery management system (20). Accordingly, the battery management system (20) can be controlled for operation based on signals received from the upper controller (2).

[0063] According to one embodiment, the battery management system (20) may include the battery diagnosis device (201) of FIG. 2. According to another embodiment, the battery management system (20) may be a different system from the battery diagnosis device (201) of FIG. 2. That is, the battery diagnosis device (201) of FIG. 2 may be included in the battery pack (1) or may be configured as another device external to the battery pack (1). For convenience of explanation, the following description will be made on the assumption that the battery diagnosis device (201) is configured as another device external to the battery pack (1). In addition, the operation of the battery diagnosis device (201) below may be performed by an in-vehicle BMS (battery management system), as well as by various devices such as a server, a cloud, a charger, or a discharger.

[0064] FIG. 2 is a block diagram showing the configuration of a battery diagnosis device and a battery diagnosis method according to one embodiment of the present document.

[0065] FIG. 3 illustrates an example of a graph showing the voltage of a battery cell according to the charge capacity of a battery cell using lithium iron phosphate (LFP) as a cathode material in a battery diagnosis device and a battery diagnosis method according to an embodiment of the present document.

[0066] FIG. 4 illustrates an example of a graph representing the current of a battery cell according to a charging process or a discharging process in a battery diagnostic device and a battery diagnostic method according to an embodiment of the present document.

[0067] Referring to FIGS. 2, 3, and 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.

[0068] The first graph (301) may represent the voltage of a battery cell according to the charge capacity of a battery cell using LFP as a positive electrode material. The first line (303) may represent the voltage according to the charge capacity of the battery cell measured when the battery cell is charged. The second line (305) may represent the voltage according to the charge capacity of the battery cell measured when the battery cell is discharged. The first section (307) may represent a section in which the voltage change of the battery cell is less than a specified voltage change amount even if the charge capacity of the battery cell changes.

[0069] The second graph (401) may represent the current of a battery cell over time during a charging process or a discharging process. The third line (403) may represent the current of a battery cell over time.

[0070] In this document, the charge capacity of a battery cell may be expressed as the state of charge (SOC), which is the charged capacity of the battery cell. The charge capacity of a battery cell represents the ratio of the remaining capacity to the full charge capacity of the battery cell, and may be expressed as a value between 0 and 1, or a value between 0% and 100%. Methods such as ampere counting, OCV (open circuit voltage)-SOC curve, and / or Kalman filter may be utilized to determine the charge capacity, but the embodiments of this document may not be limited thereto.

[0071] If the measurement accuracy of the charge capacity of a battery cell is lower than the specified accuracy, the battery cell may be overcharged or overdischarged, causing damage, and the life of the battery cell may be shortened due to the damage to the battery cell.

[0072] Additionally, if the measurement accuracy of the charge capacity of the battery cells 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.

[0073] In addition, if the measurement accuracy of the charge capacity of the battery cell is lower than the specified accuracy, the thermal management system may not operate properly depending on the charge capacity of the battery cell, which may lower the reliability of the battery cell.

[0074] Therefore, maintaining the measurement accuracy of the charge capacity of a battery cell higher than the specified accuracy may be necessary in terms of the stability and reliability of the battery cell.

[0075] At least one processor (205) of a battery diagnostic device (201) can diagnose the charge capacity of a battery cell, typically based on the voltage of the battery cell. However, for a battery cell including LFP as a cathode material, it may be difficult to diagnose the charge capacity according to changes in voltage, as shown in the first graph (301). This is because even if the charge capacity of the battery cell changes in a specific section, the voltage change of the battery cell may be less than a specified voltage change amount.

[0076] In other words, in the first section (307) of the first line (303) indicating the voltage according to the charge capacity of the battery cell measured when the battery cell is charged, and the second line (305) indicating the voltage according to the charge capacity of the battery cell measured when the battery cell is discharged, even if the charge capacity of the battery cell changes, the voltage change of the battery cell may be less than a specified voltage change amount.

[0077] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can identify the charge capacity of a battery cell based on the resistance of the battery cell including LFP as a cathode material.

[0078] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can obtain the resistance of a battery cell while performing a charging process or a discharging process.

[0079] In one embodiment, the charging process may include a process in which a charging period and a first rest period at a specific charging rate for the battery cell are alternately repeated, as shown in the second graph (401). For the charging process, the third line (403) may represent the charging current of the battery cell over time, the second period (405) may represent the charging period, and the third period (407) may represent the first rest period.

[0080] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) may obtain the resistance of the battery cell in the course of executing a charging process, based on the difference between the voltage of the battery cell in the charging section (e.g., the second section (405)) and the voltage of the battery cell in the first resting section (e.g., the third section (407)), and the current of the battery cell in the charging section.

[0081] In one embodiment, the discharge process may include a process in which a discharge interval and a second rest interval at a specific discharge rate for the battery cell are alternately repeated, as shown in the second graph (401). For the discharge process, the third line (403) may represent a discharge current of the battery cell over time, the second interval (405) may represent a discharge interval, and the third interval (407) may represent a second rest interval.

[0082] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) may obtain the resistance of the battery cell during the process of executing the discharge process, based on the difference between the voltage of the battery cell in the discharge section (e.g., the second section (405)) and the voltage of the battery cell in the second rest section (e.g., the third section (407)), and the current of the battery cell in the discharge section.

[0083] FIG. 5 illustrates an example of a graph representing a voltage of a battery cell based on a charge capacity of a battery cell identified for each of a plurality of charge rates, in a battery diagnosis device and a battery diagnosis method according to one embodiment of the present document.

[0084] Referring to FIG. 5, a graph (501) may represent resistance according to the charge capacity of a battery cell. A first line (503) may represent the resistance of a first reference battery cell according to the charge capacity of a first reference battery cell using LFP as a cathode material. A second line (505) may represent the resistance of a second reference battery cell according to the charge capacity of a second reference battery cell using LFP as a cathode material. A third line (507) may represent the resistance of a comparative battery cell according to the charge capacity of a comparative battery cell using lithium, nickel, cobalt, and manganese as a cathode material. A point (509) may represent the measured resistance of the battery cell and the charge capacity of the battery cell according to the resistance.

[0085] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can diagnose the charge capacity of the battery cell based on the relationship between the resistance of the reference battery cell and the charge capacity of the reference battery cell.

[0086] According to one embodiment, the first reference battery cell and the second reference battery cell may be different battery cells. The resistance of the reference battery cell may be identified based on the resistance of each of the plurality of reference battery cells. For example, the resistance of the reference battery cell may include an average of the resistance of the first reference battery cell and the resistance of the second reference battery cell. For example, the resistance of the reference battery cell may include the resistance of the first reference battery cell or the resistance of the second reference battery cell. However, the embodiments of the present document may not be limited thereto.

[0087] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can diagnose the charge capacity of a battery cell by substituting the resistance of the battery cell into the relationship between the resistance of the reference battery cell and the charge capacity of the reference battery cell, such as the graph (501).

[0088] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can diagnose the charge capacity of the battery cell as about 41% based on the relationship between the resistance of the reference battery cell and the charge capacity of the reference battery cell when the resistance value of the battery cell, such as point (509), is measured to be about 30 Ω.

[0089] Referring to the third line (507), in the case of a comparison battery cell, it may be difficult to diagnose the charge capacity of the comparison battery cell based on the resistance of the comparison battery cell. This is because even if the resistance of the comparison battery cell changes in a specific section, the change in the charge capacity of the comparison battery cell is less than the specified capacity change amount.

[0090] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can diagnose the charge capacity of the battery cell based on a relationship between the resistance of the reference battery cell and the charge capacity of the reference battery cell corresponding to at least one of the temperature of the battery cell, a specific charge rate, a specific discharge rate, the state of life of the battery cell, or any combination thereof.

[0091] For example, when obtaining the resistance of a battery cell during the process of executing a charging process, at least one processor (205) of the battery diagnosis device (201) can diagnose the charge capacity of the battery cell based on the relationship between the resistance of the reference battery cell and the charge capacity of the reference battery cell corresponding to at least one of the temperature of the battery cell, the charge speed of the battery cell in the charging section, the life state of the battery cell, or any combination thereof.

[0092] For example, when obtaining the resistance of a battery cell in the process of executing a discharge process, at least one processor (205) of the battery diagnosis device (201) can diagnose the charge capacity of the battery cell based on the relationship between the resistance of the reference battery cell and the charge capacity of the reference battery cell corresponding to at least one of the temperature of the battery cell, the discharge rate of the battery cell in the discharge section, the life state of the battery cell, or any combination thereof.

[0093] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) may acquire the resistance of the battery cell during the process of executing the charging process, and diagnose the charging capacity of the battery cell based on the resistance of the battery cell, if the charging speed of the battery cell can be included in a specified charging speed range for a specified time or longer. However, the embodiment of the present document may not be limited thereto.

[0094] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) may acquire the resistance of the battery cell during the process of executing the discharge process, if the discharge rate of the battery cell can be included in a designated discharge rate range for a predetermined time or longer, and diagnose the charge capacity of the battery cell based on the resistance of the battery cell. However, the embodiment of the present document may not be limited thereto.

[0095] For example, since the charging speed of a battery cell included in a vehicle may be included in a specified charging speed range for a specified period of time or longer, but the discharging speed of a battery cell included in the vehicle may not be included in a specified discharge speed range for a predetermined period of time or longer, at least one processor (205) of the battery diagnostic device (201) may obtain the resistance of the battery cell during the process of executing the charging process. However, the embodiments of the present document may not be limited thereto.

[0096] For example, at least one processor (205) of the battery diagnostic device (201) may obtain the resistance of the battery cell during the process of executing the discharge process, since the charging speed of the battery cell included in the energy storage system (ESS) may not be included in the specified charging speed range for a specified time or longer, but the discharging speed of the battery cell included in the ESS may be included for a predetermined time or longer. However, the embodiments of the present document may not be limited thereto.

[0097] FIG. 6 illustrates an example of a flow of operations of a battery diagnostic device that diagnoses a charge capacity based on a process determined during a charging process or a discharging process, in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0098] Hereinafter, it is assumed that at least one processor (205) included in the battery diagnosis device (201) of FIG. 2 performs the process of FIG. 6. In addition, in the description of FIG. 6, the operation described as being performed by the battery diagnosis device (201) can be understood as being controlled by at least one processor (205) included in the battery diagnosis device (201).

[0099] Referring to FIG. 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 the battery cell during the process of executing a charging process or to identify the resistance of the battery cell during the process of executing a discharging process.

[0100] In the second operation (603), at least one processor (205) of the battery diagnostic device (201) can identify the resistance of the battery cell during the process of executing a charging process or a discharging process.

[0101] In the third operation (605), at least one processor (205) of the battery diagnosis device (201) can diagnose the charge capacity based on the relationship between the resistance of the reference battery cell and the charge capacity of the reference battery cell, and the resistance of the battery cell.

[0102] FIG. 7 illustrates an example of a flow of operations of a battery diagnostic device for diagnosing a charge capacity of a battery cell in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0103] Hereinafter, it is assumed that at least one processor (205) included in the battery diagnosis device (201) of FIG. 2 performs the process of FIG. 7. In addition, in the description of FIG. 7, the operations described as being performed by the battery diagnosis device (201) can be understood as being controlled by at least one processor (205) included in the battery diagnosis device (201).

[0104] 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 section at a specific charging rate and a first resting section are alternately repeated for the battery cell, or may execute a discharging process in which a discharging section at a specific discharging rate and a second resting section are alternately repeated.

[0105] In the second operation (703), at least one processor (205) of the battery diagnostic device (201) can obtain the resistance of the battery cell during the process of executing a charging process or a discharging process.

[0106] In the third operation (705), at least one processor (205) of the battery diagnostic device (201) can diagnose the charge capacity of the battery cell based on the resistance of the battery cell.

[0107] FIG. 8 is a block diagram showing the hardware configuration of a computing system that performs a battery diagnosis method in a battery diagnosis device and a battery diagnosis method according to one embodiment of the present document.

[0108] Referring to FIG. 8, a computing system (800) according to an embodiment disclosed in the present document may include an MCU (810), a memory (820), an input / output I / F (830), and a communication I / F (840).

[0109] The MCU (810) may be one or more processors that execute various programs (e.g., a battery cell data collection program, a graph generation program, a data analysis program, a data decomposition algorithm, a normalization program, a battery cell diagnosis program, etc.) stored in the memory (820), process various information including battery cell characteristic data, latent variables, etc. through these programs, and perform the functions of the battery diagnosis device (201) shown in the above-described FIGS. 2 to 7.

[0110] The memory (820) 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.

[0111] Such memories (820) may be provided in multiples as needed. The memories (820) may be volatile memories or non-volatile memories. As volatile memories (820), RAM, DRAM, SRAM, etc. may be used. As non-volatile memories (820), ROM, PROM, EAROM, EPROM, EEPROM, flash memories, etc. may be used. The examples of the memories (820) listed above are merely examples and are not limited to these examples.

[0112] The input / output I / F (830) can provide an interface that enables data transmission and reception between an input device (not shown) such as a keyboard, mouse, or touch panel, and an output device (not shown) such as a display and the MCU (810).

[0113] The communication I / F (840) is a component capable of transmitting and receiving various data with the server, and may be any device capable of supporting wired or wireless communication. For example, the battery diagnostic device (201) can transmit and receive various types of information, including battery cell shape models, from a separately provided external server via the communication I / F (840).

[0114] In this way, a computer program according to an embodiment disclosed in this document may be implemented as a module that performs each function illustrated in FIG. 2, for example, by being recorded in a memory (820) and processed by an MCU (810).

[0115] In the above, although all components constituting the embodiments disclosed in this document have been described as being combined or operating in combination as one, the embodiments disclosed in this document are not necessarily limited to such embodiments. That is, within the scope of the purpose of the embodiments disclosed in this document, all of the components may be selectively combined and operated one or more times.

[0116] In addition, terms such as "include," "comprise," or "have" described above, unless specifically stated to the contrary, should be interpreted to imply the inclusion of the corresponding component, and thus should not be interpreted to exclude other components, but rather to include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed in this document belong, unless otherwise defined. Commonly used terms, such as terms defined in a dictionary, should be interpreted to be consistent with the contextual meaning of the relevant technology, and shall not be interpreted in an idealized or overly formal sense, unless explicitly defined in this document.

[0117] The foregoing disclosure outlines 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 readily appreciate that the present disclosure can be readily used as a basis for designing or modifying other structures to achieve the same purposes or advantages of the embodiments introduced herein. Furthermore, those skilled in the art will recognize that such equivalent structures do not depart from the scope of the present disclosure, and that various changes, substitutions, and modifications can be made herein without departing from the scope of the present disclosure.

Claims

1. Memory that stores at least one instruction; and comprising at least one processor executing at least one instruction; At least one processor, A charging process is performed in which a charging section at a specific charging rate and a first resting section are alternately repeated for the battery cell, or a discharging process is performed in which a discharging section at a specific discharging rate and a second resting section are alternately repeated for the battery cell, In the process of executing the above charging process or the above discharging process, the resistance of the battery cell is obtained, Based on the resistance of the battery cell, configured to diagnose the charge capacity of the battery cell, Battery diagnostic device.

2. In claim 1, At least one processor, When the resistance of the battery cell is obtained during the process of executing the above charging process, It is configured to obtain 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. Battery diagnostic device.

3. In claim 1, At least one processor, When the resistance of the battery cell is obtained during the process of executing the above discharge process, It is configured to obtain the resistance of the battery cell based on the difference between the voltage of the battery cell in the discharge section and the voltage of the battery cell in the second rest section, and the current of the battery cell in the discharge section. Battery diagnostic device.

4. In claim 1, At least one processor, Based on the relationship between the resistance of a reference battery cell different from the above battery cell and the charge capacity of the reference battery cell, the charge capacity of the battery cell is diagnosed. Battery diagnostic device.

5. In claim 4, At least one processor, configured to diagnose the charge capacity of the battery cell based on the relationship corresponding to at least one of the temperature of the battery cell, the specific charge rate, the specific discharge rate, the life state of the battery cell, or any combination thereof. Battery diagnostic device.

6. In claim 1, At least one processor, If the charging speed of the battery cell can be included in a specified charging speed range for a specified time or longer, the resistance of the battery cell is configured to be acquired during the process of executing the charging process. Battery diagnostic device.

7. In claim 1, At least one processor, If the discharge rate of the battery cell can be included in a designated discharge rate range for a predetermined time or longer, the resistance of the battery cell is configured to be acquired during the process of executing the discharge process. Battery diagnostic device.

8. In claim 1, The positive electrode of the above battery cell is, Containing lithium iron phosphate (LFP), Battery diagnostic device.

9. An operation of executing a charging process in which a charging section at a specific charging rate and a first resting section are alternately repeated for the battery cell, or executing a discharging process in which a discharging section at a specific discharging rate and a second resting section are alternately repeated for the battery cell; An operation of obtaining the resistance of the battery cell during the process of executing the charging process or the discharging process; and An operation for diagnosing a charge capacity of the battery cell based on the resistance of the battery cell, How to diagnose a battery.

10. In claim 9, In the process of executing the above charging process or the above discharging process, the operation of obtaining the resistance of the battery cell is, When the resistance of the battery cell is obtained during the process of executing the above charging process, An operation of 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, How to diagnose a battery.

11. In claim 9, In the process of executing the above charging process or the above discharging process, the operation of obtaining the resistance of the battery cell is, When the resistance of the battery cell is obtained during the process of executing the above discharge process, An operation of obtaining the resistance of the battery cell based on the difference between the voltage of the battery cell in the discharge section and the voltage of the battery cell in the second rest section, and the current of the battery cell in the discharge section, How to diagnose a battery.

12. In claim 9, Based on the resistance of the above battery cell, the operation of diagnosing the charge capacity of the above battery cell is as follows: An operation of diagnosing a charge capacity of a battery cell based on a relationship between a resistance of a reference battery cell different from the battery cell and a charge capacity of the reference battery cell, How to diagnose a battery.

13. In claim 12, An operation of diagnosing the charge capacity of the battery cell based on the relationship between the resistance of a reference battery cell different from the above battery cell and the charge capacity of the reference battery cell is as follows: An operation of diagnosing a charge capacity of the battery cell based on the relationship corresponding to at least one of the temperature of the battery cell, the specific charge rate, the specific discharge rate, the life state of the battery cell, or any combination thereof. How to diagnose a battery.

14. In claim 9, In the process of executing the above charging process or the above discharging process, the operation of obtaining the resistance of the battery cell is, An operation of acquiring the resistance of the battery cell during the process of executing the charging process, wherein the charging speed of the battery cell can be included in a specified charging speed range for a specified time or longer. How to diagnose a battery.

15. In claim 9, In the process of executing the above charging process or the above discharging process, the operation of obtaining the resistance of the battery cell is, An operation of acquiring the resistance of the battery cell in the process of executing the discharge process, wherein the discharge rate of the battery cell can be included in a specified discharge rate range for a predetermined time or longer. How to diagnose a battery.

16. In claim 9, The positive electrode of the above battery cell is, Containing lithium iron phosphate (LFP), How to diagnose a battery.

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