Battery diagnosis device and method therefor

Abstract

A battery diagnosis device according to an embodiment of present document may comprise: an interface for obtaining first battery information indicating a voltage with respect to a capacity of a battery; and at least one processor, wherein the at least one processor: classifies the first battery information on the basis of a designated section; identifies a temperature of the battery corresponding to first partial battery information included in the designated section in the first battery information; changes the first partial battery information to second partial battery information corresponding to a target temperature by comparing the temperature of the battery with the target temperature; and diagnoses a degree of degradation of the battery on the basis of second battery information including the second partial battery information.

Description

Battery diagnostic device and method

[0001] Cross-citation with related applications

[0002] The present application claims the benefit of priority based on Korean Patent Application No. 10-2024-0193240 filed on December 20, 2024, and Korean Patent Application No. 10-2025-0107398 filed on August 5, 2025, and includes all contents disclosed in the documents of said patent applications as part of this specification.

[0003] Technology field

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

[0005] With the proliferation of electric vehicles powered by electrical energy, research and development on new vehicle architectures is actively underway. For example, electric vehicles can be powered by rechargeable batteries; here, rechargeable batteries refer to rechargeable batteries that include conventional Ni / Cd and Ni / MH batteries, as well as recent lithium-ion batteries. Among rechargeable batteries, lithium-ion batteries have the advantage of significantly higher energy density compared to conventional Ni / Cd and Ni / MH batteries. Furthermore, lithium-ion batteries can be manufactured in a compact and lightweight manner, making them suitable for use as power sources for mobile devices. Recently, their scope of application has expanded to include power sources for electric vehicles, drawing attention as a next-generation energy storage medium.

[0006] Furthermore, research is being conducted on technologies for diagnosing battery condition to improve battery stability and efficiency. Technologies are being developed not only to diagnose battery condition based on characteristics measured by sensors, but also to enhance the accuracy and precision of diagnosis by diagnosing the battery condition based on battery data.

[0007] According to the embodiments disclosed in this document, a battery diagnostic device and a method for compensating capacity according to temperature are to be provided.

[0008] According to the embodiments disclosed in this document, the present invention aims to provide a battery diagnostic device and a method that improve diagnostic accuracy in diagnosing the degree of battery degradation by correcting the capacity according to temperature.

[0009] The technical problems of this document are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the descriptions below.

[0010] A battery diagnostic device according to one embodiment of the present document may include an interface for obtaining first battery information indicating a voltage for the capacity of a battery, and at least one processor.

[0011] According to one embodiment, the at least one processor can divide the first battery information according to a designated section, identify the temperature of the battery corresponding to the first partial battery information included in the designated section among the first battery information, and by comparing the temperature with a target temperature, change the first partial battery information into second partial battery information corresponding to the target temperature, and diagnose the degree of degradation of the battery based on the second battery information including the second partial battery information.

[0012] According to one embodiment, the at least one processor can change the first partial battery information to the second partial battery information by correcting the capacity of the battery corresponding to the first partial battery information to a corrected capacity based on the temperature and the target temperature.

[0013] According to one embodiment, the at least one processor can identify the first partial battery information by dividing the voltage included in the first battery information into the specified voltage range when the specified range represents a specified voltage range, and correct the capacity of the battery corresponding to the specified voltage range to the corrected capacity.

[0014] According to one embodiment, the at least one processor can obtain the first battery information representing the voltage for the capacity of the battery during the process of charging the battery included in the vehicle based on a specified charging speed.

[0015] According to one embodiment, the at least one processor can obtain third battery information representing a voltage for the capacity of the battery and another battery, and diagnose the degree of degradation of the battery by comparing the third battery information and the second battery information.

[0016] According to one embodiment, the at least one processor identifies a first capacity of the other battery corresponding to a first specific temperature lower than the temperature, which is included in reference battery information representing a voltage for the capacity of the battery and another battery, and identifies a second capacity of the other battery corresponding to a second specific temperature higher than the temperature, which is included in the reference battery information, and can correct the capacity of the battery included in the first battery information to a corrected capacity at the target temperature based on the first capacity, the second capacity, the first specific temperature, the second specific temperature, and the temperature.

[0017] According to one embodiment, the degree of degradation of the battery may include the state of health (SOH) of the battery.

[0018] A battery diagnostic method according to another embodiment of the present document may include: acquiring first battery information representing a voltage for the capacity of the battery; classifying the first battery information according to a designated interval; identifying the temperature of the battery corresponding to first partial battery information included in the designated interval among the first battery information; changing the first partial battery information to second partial battery information corresponding to the target temperature by comparing the temperature with a target temperature; and diagnosing the degree of degradation of the battery based on second battery information including the second partial battery information.

[0019] According to one embodiment, the operation of changing the first partial battery information to the second partial battery information corresponding to the target temperature by comparing the temperature and the target temperature may include the operation of changing the first partial battery information to the second partial battery information by correcting the capacity of the battery corresponding to the first partial battery information to a corrected capacity based on the temperature and the target temperature.

[0020] According to one embodiment, when the specified range represents a specified voltage range, the operation of classifying the first battery information according to the specified range includes classifying the voltage included in the first battery information into the specified voltage range, and the operation of changing the first partial battery information into the second partial battery information by correcting the capacity of the battery corresponding to the first partial battery information to a corrected capacity based on the temperature and the target temperature may include correcting the capacity of the battery corresponding to the specified voltage range to the corrected capacity.

[0021] According to one embodiment, the operation of obtaining first battery information representing a voltage for the capacity of a battery may include the operation of obtaining said first battery information representing a voltage for the capacity of a battery during the process of charging said battery included in a vehicle based on a specified charging speed.

[0022] According to one embodiment, the operation of diagnosing the degree of degradation of the battery based on the second battery information may include the operation of obtaining third battery information representing a voltage for the capacity of the battery and another battery, and the operation of diagnosing the degree of degradation of the battery by comparing the third battery information and the second battery information.

[0023] According to one embodiment, the operation of changing the first partial battery information to the second partial battery information by correcting the capacity of the battery corresponding to the first partial battery information to a corrected capacity based on the temperature and the target temperature may include: identifying the first capacity of the other battery corresponding to a first specific temperature lower than the temperature, which is included in reference battery information representing the voltage for the capacity of the battery and another battery; identifying the second capacity of the other battery corresponding to a second specific temperature higher than the temperature, which is included in the reference battery information; and correcting the capacity of the battery included in the first battery information to a corrected capacity at the target temperature based on the first capacity, the second capacity, the first specific temperature, the second specific temperature, and the temperature.

[0024] According to one embodiment, the degree of degradation of the battery may include the state of health (SOH) of the battery.

[0025] This technology can adjust capacity according to temperature.

[0026] In addition, this technology can improve the diagnostic accuracy of diagnosing the degree of battery degradation by adjusting the capacity according to temperature.

[0027] In addition, various effects that can be identified directly or indirectly through this document may be provided.

[0028] FIG. 1 is a block diagram showing a battery pack in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0029] FIG. 2 is a block diagram showing the configuration of a battery diagnostic device in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0030] FIG. 3 illustrates an example of a graph showing a capacity to obtain a corrected capacity when the temperature of the battery is lower than the target temperature in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0031] FIG. 4 illustrates an example of a graph showing a capacity to obtain a corrected capacity when the temperature of the battery is higher than the target temperature in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0032] FIG. 5 illustrates an example of a graph showing capacity and corrected capacity in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0033] FIG. 6 illustrates the flow of operation of a battery diagnostic device that diagnoses the state of a battery based on second battery information in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0034] FIG. 7 is a block diagram showing the hardware configuration of a computing system for performing a battery diagnostic method according to one embodiment disclosed in this document.

[0035] Some embodiments disclosed herein are described below with reference to the various embodiments of the accompanying drawings. However, this is not intended to limit the technology to specific embodiments and should be understood to include various modifications, equivalents, and / or alternatives to embodiments of the technology.

[0036] It should be noted that when assigning reference numerals to the components of each drawing, the same components are assigned the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the various embodiments disclosed in this document, if it is determined that a detailed description of related known configurations or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. The singular form of a noun corresponding to an item may include one or more items unless the relevant context clearly indicates otherwise.

[0037] In describing the components of the embodiments of this document, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components and do not limit the essence, order, or sequence of the components. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the embodiments disclosed in this document pertain. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0038] Additionally, in this disclosure, expressions of "greater than" or "less than" may be used to determine whether a specific condition is satisfied or fulfilled; however, this is merely for the purpose of expressing an example and does not exclude descriptions of "greater than" or "less than." Conditions described as "greater than" may be replaced with "greater than," conditions described as "less than" may be replaced with "less than," and conditions described as "greater than and less than" may be replaced with "greater than and less than." Furthermore, "A" to "B" below refer to at least one of the elements from A (including A) to B (including B).

[0039] In this document, each of the phrases such as "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "at least one of A, B, or C" may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof.

[0040] In this document, where any component (e.g., 1) is referred to as being “connected,” “coupled,” or “joined” to another component (e.g., 2), with or without the terms “functionally” or “communicationally,” or where it is referred to as “coupled” or “connected,” it means that the component may be connected to the other component directly (e.g., via a wire), wirelessly, or through a third component.

[0041] According to one embodiment, the method according to the various embodiments disclosed herein may be provided as included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store or directly between two user devices. In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily created on a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0042] According to various embodiments, each component (e.g., module or program) of the described components may include a singular or multiple entities, and some of the multiple entities may be separated and placed in other components. According to various embodiments, one or more of the aforementioned components or operations may be omitted, or one or more other components or operations may be added. Generally or additionally, multiple components (e.g., module or program) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the multiple components in the same or similar manner as they were performed by the corresponding component among the multiple components prior to integration. According to various embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically; one or more of the operations may be executed in a different order; may be omitted; or one or more other operations may be added.

[0043] Hereinafter, embodiments of the present document will be described in detail with reference to FIGS. 1 to 7.

[0044] FIG. 1 is a block diagram showing a battery pack in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0045] Referring to FIG. 1, the battery pack (1) may include a battery unit (12), a sensor unit (14), a switching unit (16), and a battery management system (BMS) (20). At this time, the battery pack (1) may be equipped with a plurality of battery units (12), sensor units (14), switching units (16), and battery management systems (20).

[0046] According to one embodiment, the battery unit (12) can supply power to a target device (not shown). To this end, the battery unit (12) may be electrically connected to the target device. Here, the target device may include an electrical, electronic, or mechanical device that operates by receiving power from the battery pack (1). For example, the target device may be an electric vehicle (EV) or an energy storage system (ESS), but is not limited thereto.

[0047] According to one embodiment, the battery unit (12) may include at least one battery cell (10) capable of charging and discharging. Here, the battery cell (10) may be a basic unit of a battery cell capable of charging and discharging electrical energy. For example, the battery cell (10) may be a lithium-ion (Li-ion) battery, a lithium-ion polymer (Li-ion polymer) battery, a nickel-cadmium (Ni-Cd) battery, a nickel-hydrogen (Ni-MH) battery, etc., but is not limited thereto.

[0048] According to one embodiment, a plurality of battery units (12) may be connected in series or in parallel. For example, a battery unit (12) may be a battery module, a battery bank, or a set of battery cells (cell-to-pack structure).

[0049] According to one embodiment, the sensor unit (14) can obtain information related to the battery unit (12). According to one embodiment, the sensor unit (14) can obtain values ​​(or information) related to the state of each of the battery unit (12) or battery cells (10). In one embodiment, the values ​​related to the state may include at least one value for the voltage, current, resistance, state of charge (SOC), state of health (SOH), or temperature of the battery cell, or a combination thereof.

[0050] According to one embodiment, the sensor unit (14) can provide information of each of the plurality of battery units (12) to the battery management system (20).

[0051] According to one embodiment, the switching unit (16) may include an element for controlling the current flow for charging or discharging the battery unit (12). For example, the switching unit (16) may include at least one relay and / or magnetic contactor, etc., depending on the specifications of the battery pack (1).

[0052] According to one embodiment, a battery management system (BMS) (20) can control or manage a battery pack (1) by monitoring the voltage, current, temperature, etc. of the battery pack (1). For example, the battery management system (20) may include a plurality of terminals as an interface for receiving values ​​of the various parameters described above, and a circuit connected to these terminals to perform processing of the received values. Additionally, the battery management system (20) can control a sensor unit (14) and / or a switching unit (16). For example, the battery management system (20) may be connected to a plurality of battery units (12) to monitor the status of each of the plurality of battery units (12) and control the ON / OFF of relays or contactors.

[0053] According to one embodiment, the operation of the battery management system (20) can be performed by a battery management system (BMS) in the vehicle, as well as by various devices such as a server, cloud, charger, or discharger.

[0054] The upper controller (2) can transmit control signals for a plurality of battery units (12) to the battery management system (20). Accordingly, the operation of the battery management system (20) can be controlled based on the signals applied from the upper controller (2).

[0055] According to one embodiment, the battery management system (20) may include the battery diagnostic device (201) of FIG. 2. According to another embodiment, the battery management system (20) may be a different system from the battery diagnostic device (201) of FIG. 2. That is, the battery diagnostic device (201) of FIG. 2 may be included in the battery pack (1) or may be configured as another device outside the battery pack (1). For convenience of explanation, the following description assumes that the battery diagnostic device (201) is configured as another device outside the battery pack (1). Furthermore, the operation of the battery diagnostic device (201) below may be performed by a battery management system (BMS) within the vehicle, as well as by various devices such as a server, cloud, charger, or discharger.

[0056] FIG. 2 is a block diagram showing the configuration of a battery diagnostic device in a battery diagnostic device and a battery diagnostic method according to one embodiment of the present document.

[0057] Referring to FIG. 2, the battery diagnostic device (201) may include an interface (203) for obtaining first battery information representing a voltage for the capacity of the battery, and at least one processor (205) for executing at least one instruction, and may further include a memory for storing at least one instruction.

[0058] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can obtain first battery information indicating a voltage for the capacity of the battery through an interface (203).

[0059] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can distinguish the first battery information according to a designated section.

[0060] The temperature of a battery corresponding to the first partial battery information included in a designated section among the first battery information can be identified. The temperature of the battery corresponding to the first partial battery information may represent the temperature of the battery measured at the time when the first partial battery information is acquired.

[0061] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can change the first partial battery information into the second partial battery information by comparing the temperature of the battery with the target temperature.

[0062] For example, at least one processor (205) of the battery diagnostic device (201) can obtain reference battery information indicating the voltage for the capacity of the battery and another battery according to the target temperature. Information regarding the reference battery is described below in FIGS. 3 and 4.

[0063] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can correct the capacity of the battery corresponding to the first partial battery information to the corrected capacity of the battery cell at the target temperature corresponding to the second partial battery information, based on reference battery information. A method for correcting the capacity is described below in FIGS. 3 and 4.

[0064] The target temperature may represent a temperature that serves as a standard for diagnosing the degree of degradation of the battery. For example, the target temperature may represent a temperature at which third battery information is obtained. At least one processor (205) of the battery diagnostic device (201) can improve the accuracy of the degree of degradation diagnosis by changing the first battery information obtained from the battery temperature into second battery information corresponding to the target temperature.

[0065] According to one embodiment, at least one processor (205) of a battery diagnostic device (201) can estimate the degree of degradation of a battery by comparing second battery information, which includes a correction capacity, with third battery information, which represents a voltage for the capacity of a battery and another battery. Here, the battery and another battery are electrically configured identically and may be of the same type. The degree of degradation of the battery may include the state of health (SOH) or the amount of SOH reduction.

[0066] FIG. 3 illustrates an example of a graph showing a capacity to obtain a corrected capacity when the temperature of the battery is lower than the target temperature in a battery diagnostic device and method according to one embodiment of the present document.

[0067] Referring to FIG. 3, a graph (301) may represent first battery information and reference battery information when the temperature of the battery is lower than the target temperature. A first line (303) may represent first reference battery information including voltages for the capacity of a battery and another battery at a first specific temperature (e.g., about 1.5°C). A second line (307) may represent second reference battery information including voltages for the capacity of another battery at a second specific temperature (e.g., about 25°C). A third line (305) may represent first battery information at a third specific temperature (e.g., Tt).

[0068] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can change the first battery information at the third specific temperature, which is the temperature of the battery corresponding to the first battery information, to the second battery information at the target temperature (e.g., about 25°C) through Equation 1 when the third specific temperature is lower than the target temperature.

[0069] In the following, the operation of changing the first battery information to the second battery information according to one embodiment may include identifying the first partial battery information among the first battery information, identifying the first partial battery information as the second partial battery information, and identifying the second battery information including the second partial battery information.

[0070] [Mathematical Formula 1]

[0071]

[0072] represents the corrected capacity, which is the battery capacity at the target temperature, and Silver indicates the capacity of the battery at a third specific temperature, and represents the capacity of another battery at a first specific temperature, and represents the capacity of another battery at a second specific temperature, and represents the first specific temperature, and represents a second specific temperature, and T may represent a third specific temperature, which is the temperature of the battery at the time when the first battery information is acquired.

[0073] The charging speed during the process of acquiring reference battery information (e.g., first reference battery information, second reference battery information) can correspond to the charging speed during the process of acquiring first battery information.

[0074] FIG. 4 illustrates an example of a graph showing a capacity to obtain a corrected capacity when the temperature of the battery is higher than the target temperature in a battery diagnostic device and method according to one embodiment of the present document.

[0075] Referring to FIG. 4, the graph (401) may represent first battery information and reference battery information when the temperature of the battery is higher than the target temperature. The first line (403) may represent first reference battery information including a voltage for the capacity of another battery at a first specific temperature (e.g., about 25°C). The second line (407) may represent second reference battery information including a voltage for the capacity of another battery at a second specific temperature (e.g., about 35°C). The third line (405) may represent first battery information at a third specific temperature.

[0076] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can change the first battery information at the third specific temperature, which is the temperature of the battery corresponding to the first battery information, to the second battery information at the target temperature (e.g., about 25°C) through Equation 2 when the third specific temperature is higher than the target temperature.

[0077] [Mathematical Formula 2]

[0078]

[0079] represents the corrected capacity, which is the battery capacity at the target temperature, and Silver indicates the capacity of the battery at a third specific temperature, and represents the capacity of another battery at a first specific temperature, and represents the capacity of another battery at a second specific temperature, and represents the first specific temperature, and represents a second specific temperature, and T can represent a third specific temperature, which is the temperature of the battery.

[0080] The charging speed during the process of acquiring reference battery information (e.g., first reference battery information, second reference battery information) can correspond to the charging speed during the process of acquiring first battery information.

[0081] In FIGS. 3 and 4, only cases where the temperature at which the first reference battery information is obtained is constant are illustrated, but the embodiments of this document may not be limited thereto.

[0082] According to one embodiment, the temperature of the battery may be changed during the process of acquiring the first reference battery information. For example, the temperature of the battery in which some information included in the first reference battery information is acquired may be below the target temperature, and the temperature of the battery in which other information is acquired may be above the target temperature.

[0083] According to one embodiment, at least one processor (205) of a battery diagnostic device (201) can change a first-1 partial battery information obtained at a temperature below a target temperature among the first battery information into second-1 partial battery information by referring to Equation 1, and can change another first-2 partial battery information obtained at a temperature above a target temperature among the first battery information into second-2 partial battery information by referring to Equation 2. The second-1 partial battery information and the second-2 partial battery information may be included in the second battery information.

[0084] According to one embodiment, at least one processor (205) of the battery diagnostic device (201) can correct the capacity of the battery corresponding to the specified voltage range to the corrected capacity by dividing the voltage included in the first battery information into a specified voltage range. This is because the temperature of the battery may change during the process of acquiring the first battery information.

[0085] For example, if the above voltage range is a range less than the first voltage value, at least one processor (205) of the battery diagnostic device (201) can identify first-third partial battery information corresponding to the range less than the first voltage value among the first battery information.

[0086] At least one processor (205) of the battery diagnostic device (201) can correct the capacity of the battery included in the first-third partial battery information to a corrected capacity by referring to Equation 1 or Equation 2, and can identify the second-third partial battery information based on the corrected corrected capacity.

[0087] For example, if the voltage range is a range greater than or equal to the first voltage value, at least one processor (205) of the battery diagnostic device (201) can identify first- and fourth partial battery information corresponding to the range greater than or equal to the first voltage value among the first battery information.

[0088] At least one processor (205) of the battery diagnostic device (201) can correct the capacity of the battery included in the first-4 partial battery information to a corrected capacity by referring to Equation 1 or Equation 2, and can identify the second-4 partial battery information based on the corrected corrected capacity. The second-3 partial battery information and the second-4 partial battery information may be included in the second battery information.

[0089] FIG. 5 illustrates an example of a graph showing capacity and corrected capacity in a battery diagnostic device and method according to one embodiment of the present document.

[0090] Referring to FIG. 5, the graph (501) may represent the capacity included in the first battery information corresponding to a temperature in the first temperature range (e.g., a range between about 4°C and about 13°C) in the first case (e.g., test 1), and the corrected capacity included in the second battery information corresponding to a target temperature (e.g., about 25°C). The first existing data (503) may represent the capacity loss rate according to the capacity before correction. The first correction data (505) may represent the capacity loss rate according to the corrected capacity after correction. In the first case, the driving range of the vehicle containing the battery is about 65,000 km, and the state of charge (SOC) range in which charging is performed may include a range from about 12% to about 96%.

[0091] Specifically, since the battery temperature in the first case is lower than the target temperature, when capacity correction is performed, the capacity loss rate can be reduced because the corrected capacity of the battery at the target temperature is larger than the capacity of the battery in the first case.

[0092] In the second case (e.g., test 2), at least one processor (205) of the battery diagnostic device (201) according to one embodiment can correct the capacity included in the first battery information corresponding to a temperature of the second temperature range (e.g., a range between about 32°C and about 34°C) to the corrected capacity included in the second battery information corresponding to a target temperature (e.g., about 25°C). The second existing data (507) may represent the capacity loss rate according to the capacity before correction. The second corrected data (509) may represent the capacity loss rate according to the corrected capacity after correction. In the second case, the driving distance of the vehicle containing the battery is about 79,000 km, and the state of charge (SOC) range in which charging is performed may include a range from about 12% to about 98%.

[0093] In the third case (e.g., test 3), at least one processor (205) of the battery diagnostic device (201) according to one embodiment can correct the capacity included in the first battery information corresponding to a temperature of the third temperature range (e.g., a range between about 25°C and about 32°C) to the corrected capacity included in the second battery information corresponding to a target temperature (e.g., about 25°C). The third existing data (511) may represent a capacity loss rate according to the capacity before correction. The third corrected data (513) may represent a capacity loss rate according to the corrected capacity after correction. In the third case, the driving distance of the vehicle containing the battery is about 100,000 km, and the state of charge (SOC) range in which charging is performed may include a range from about 15% to about 97%.

[0094] Specifically, since the battery temperature in the second and third cases is higher than the target temperature, when capacity correction is performed, the capacity of the battery at the target temperature becomes smaller compared to the capacity of the battery in the second and third cases, so the capacity loss rate may increase.

[0095] In this way, at least one processor (205) of the battery diagnostic device (201) can improve the diagnostic accuracy of the degree of battery degradation, such as the capacity loss rate, by correcting the capacity with a corrected capacity according to the target temperature and then identifying the capacity loss rate according to the corrected capacity.

[0096] FIG. 6 illustrates the flow of operation of a battery diagnostic device that diagnoses the state of a battery based on second battery information in a battery diagnostic device and method according to one embodiment of the present document.

[0097] In the following, it is assumed that at least one processor (205) of the battery diagnostic device (201) of FIG. 2 performs the process of FIG. 6. Additionally, in the description of FIG. 6, the operation described as being performed by the battery diagnostic device (201) can be understood as being controlled by at least one processor (205) of the battery diagnostic device (201).

[0098] Referring to FIG. 6, in the first operation (601), at least one processor (205) of the battery diagnostic device (201) according to one embodiment can distinguish the first battery information according to a designated section.

[0099] In the second operation (603), at least one processor (205) of the battery diagnostic device (201) according to one embodiment can identify a temperature corresponding to the first partial battery information included in a designated section of the first battery information.

[0100] In the third operation (605), at least one processor (205) of the battery diagnostic device (201) according to one embodiment can change the first partial battery information into the second partial battery information corresponding to the target temperature by comparing the temperature and the target temperature.

[0101] In the fourth operation (607), at least one processor (205) of the battery diagnostic device (201) according to one embodiment can diagnose the degree of degradation of the battery based on second battery information including second partial battery information.

[0102] FIG. 7 is a block diagram showing the hardware configuration of a computing system for performing a battery diagnostic method according to one embodiment disclosed in this document.

[0103] Referring to FIG. 7, a computing system (700) according to one embodiment disclosed in this document may include an MCU (710), memory (720), an input / output I / F (730), and a communication I / F (740).

[0104] The MCU (710) may be at least one processor that executes various programs stored in memory (720) (e.g., battery cell data collection program, graph generation program, data analysis program, data decomposition algorithm, normalization program, battery cell diagnosis program, etc.), processes various information including characteristic data and potential variables of the battery cell through these programs, and performs the functions of the battery diagnosis device (201) shown in FIGS. 1 to 6.

[0105] The memory (720) 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.

[0106] These memories (720) may be provided in multiple quantities as needed. The memories (720) may be volatile memories or non-volatile memories. As volatile memories, the memory (720) may use RAM, DRAM, SRAM, etc. As non-volatile memories, the memory (720) may use ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. The examples of the listed memories (720) are merely examples and are not limited to these examples.

[0107] The input / output I / F (730) can provide an interface that enables data transmission and reception between an input device (not shown), such as a keyboard, mouse, or touch panel, an output device (not shown), and an MCU (710).

[0108] The communication I / F (740) is configured to transmit and receive various data with a server and may be various devices capable of supporting wired or wireless communication. For example, the battery diagnostic device (201) can transmit and receive various information, including the shape model of a battery cell, from a separately provided external server via the communication I / F (740).

[0109] In this way, a computer program according to one embodiment disclosed in this document may be implemented as a function module that performs, for example, each of the functions illustrated in FIG. 1 by being written to memory (720) and processed by an MCU (710).

[0110] As described above, even though all components constituting the embodiments disclosed in this document have been described as being combined or operating in combination, the embodiments disclosed in this document are not necessarily limited to such embodiments. That is, within the scope of the purposes of the embodiments disclosed in this document, all components may be selectively combined in one or more ways to operate.

[0111] Furthermore, terms such as "include," "compose," or "have" as described above, unless specifically stated otherwise, mean that the relevant component may be inherent; thus, they should be interpreted as allowing for the inclusion of additional components rather than excluding them. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the embodiments disclosed in this document pertain, unless otherwise defined. Commonly used terms, such as those defined in advance, should be interpreted in accordance with their contextual meanings in the relevant technology and, unless explicitly defined in this document, should not be interpreted in an ideal or overly formal sense.

[0112] The foregoing disclosure outlines the features of several embodiments to enable those skilled in the art to better understand the aspects of the present disclosure. Those skilled in the art will understand that the present disclosure can be readily used as a basis for designing or modifying other structures to perform the same purpose or achieve the same advantages as the embodiments introduced herein. Furthermore, those skilled in the art will recognize that such equivalent configurations do not depart from the scope of the present disclosure and that various changes, substitutions, and modifications may be made in the present specification without departing from the scope of the present disclosure.

Claims

1. An interface for obtaining first battery information indicating a voltage for the capacity of the battery; and It includes at least one processor, The above-mentioned at least one processor is, The above first battery information is classified according to a designated section, and Identifying the temperature of the battery corresponding to the first partial battery information included in the designated section among the first battery information, and By comparing the above temperature and the target temperature, the first partial battery information is changed to second partial battery information corresponding to the target temperature, and A configuration configured to diagnose the degree of degradation of the battery based on second battery information including the second partial battery information. Battery diagnostic device.

2. In Claim 1, The above-mentioned at least one processor is, Based on the above temperature and the above target temperature, the capacity of the battery corresponding to the first partial battery information is corrected to a corrected capacity, thereby changing the first partial battery information to the second partial battery information, Battery diagnostic device.

3. In Claim 2, The above-mentioned at least one processor is, If the above-mentioned specified interval represents a specified voltage interval, By dividing the voltage included in the first battery information into the specified voltage range, the first partial battery information is identified, and Configured to correct the capacity of the battery corresponding to the above-specified voltage range to the above-specified corrected capacity, Battery diagnostic device.

4. In Claim 1, The above-mentioned at least one processor is, In the process of charging the battery included in the vehicle based on a specified charging speed, the first battery information representing the voltage for the capacity of the battery is configured to be obtained. Battery diagnostic device.

5. In Claim 1, The above-mentioned at least one processor is, Obtain third battery information indicating the voltage for the capacity of the above battery and another battery, and A configuration configured to diagnose the degree of degradation of the battery by comparing the third battery information and the second battery information. Battery diagnostic device.

6. In Claim 2, The above-mentioned at least one processor is, Included in reference battery information indicating the voltage for the capacity of the above battery and another battery, and identifying the first capacity of the other battery corresponding to a first specific temperature lower than the above temperature, Identifying the second capacity of the other battery that is included in the above reference battery information and corresponds to a second specific temperature higher than the above temperature, and A configuration configured to correct the capacity of the battery included in the first battery information to a corrected capacity at the target temperature based on the first capacity, the second capacity, the first specific temperature, the second specific temperature, and the temperature. Battery diagnostic device.

7. In Claim 1, The degree of degradation of the above battery is, including the state of health (SOH) of the above battery, Battery diagnostic device.

8. An operation to obtain first battery information indicating the voltage for the capacity of the battery; The operation of classifying the above-mentioned first battery information according to a designated section; An operation to identify the temperature of the battery corresponding to the first partial battery information included in the designated section among the first battery information; An operation of changing the first partial battery information into second partial battery information corresponding to the target temperature by comparing the above temperature and the target temperature; and A method comprising diagnosing the degree of degradation of the battery based on second battery information including the second partial battery information. Battery diagnostic method.

9. In Claim 8, The operation of changing the first partial battery information into second partial battery information corresponding to the target temperature by comparing the above temperature and the target temperature is, Based on the above temperature and the above target temperature, the operation of changing the first partial battery information to the second partial battery information by correcting the capacity of the battery corresponding to the first partial battery information to a corrected capacity, Battery diagnostic method.

10. In Claim 9, If the above-mentioned specified interval represents a specified voltage interval, The operation of classifying the above-mentioned first battery information according to a designated section is, The operation of dividing the voltage included in the first battery information into the specified voltage range is included. The operation of changing the first partial battery information to the second partial battery information by correcting the capacity of the battery corresponding to the first partial battery information to a corrected capacity based on the above temperature and the above target temperature is, The operation of correcting the capacity of the battery corresponding to the above-mentioned specified voltage range to the above-mentioned corrected capacity, Battery diagnostic method.

11. In Claim 8, The operation of obtaining first battery information indicating the voltage for the battery capacity is, In the process of charging the battery included in the vehicle based on a specified charging speed, the operation of acquiring the first battery information representing the voltage for the capacity of the battery is included. Battery diagnostic method.

12. In claim 8, The operation of diagnosing the degree of degradation of the battery based on the second battery information is, The operation of obtaining third battery information representing the voltage for the capacity of the above battery and another battery; and A method comprising diagnosing the degree of degradation of the battery by comparing the third battery information and the second battery information. Battery diagnostic method.

13. In Claim 9, The operation of changing the first partial battery information to the second partial battery information by correcting the capacity of the battery corresponding to the first partial battery information to a corrected capacity based on the above temperature and the above target temperature is, An operation to identify the first capacity of the other battery corresponding to a first specific temperature lower than the temperature, which is included in reference battery information indicating the voltage for the capacity of the battery and another battery; An operation to identify the second capacity of the other battery that is included in the reference battery information above and corresponds to a second specific temperature higher than the temperature; and The method includes an operation of correcting the capacity of the battery included in the first battery information to a corrected capacity at the target temperature based on the first capacity, the second capacity, the first specific temperature, the second specific temperature, and the temperature. Battery diagnostic method.

14. In Claim 8, The degree of degradation of the above battery is, including the state of health (SOH) of the above battery, Battery diagnostic method.

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