Battery diagnosis apparatus and battery diagnosis method

Abstract

According to some embodiments, a battery diagnosis apparatus comprises: an interface for acquiring, at every collection period, battery data from a battery to be diagnosed, when the current cycle is initiated; and a controller, which determines, at every collection period, whether the battery data passes through test items, so as to generate a first count value of the current cycle, accumulates the number of times that the determination of the test items fails in the current cycle, so as to generate a second count value of the current cycle, performs, on the basis of a first cumulative value of the first count value for a first number of cycles, first diagnosis on the battery to be diagnosed, and performs, on the basis of a second cumulative value of the second count value for a second number of cycles, second diagnosis on the battery to be diagnosed.

Description

Battery diagnostic device and battery diagnostic method

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Republic of Korea Patent Application No. 10-2024-0045416, filed April 3, 2024, the entire disclosure of which is incorporated herein by reference.

[0003] Technology field

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

[0005] Recently, active research and development has been conducted on secondary batteries. The term "secondary battery" refers to a rechargeable battery, encompassing both conventional Ni / Cd and Ni / MH batteries, as well as recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries can boast higher energy densities than conventional Ni / Cd and Ni / MH batteries. They can be manufactured in small and lightweight designs, making them highly versatile power sources for mobile devices. Recently, their use has expanded to include power sources for electric vehicles, attracting attention as a next-generation energy storage medium.

[0006] To prevent battery accidents caused by overheating, the battery management system (BMS) can detect thermal abnormalities and alert the vehicle and driver. For example, battery voltage and temperature can be measured, and early warnings of thermal events can be issued based on these measurements. If battery data collection is unstable due to communication issues with the BMS, overheating event testing is performed with limited data. Such data collection failures can lead to reduced accuracy in overheating diagnosis.

[0007] One purpose of the embodiments disclosed in this document is to provide a battery diagnostic device and a battery diagnostic method capable of more accurately diagnosing an overheating event even when battery data collection is poor due to an unstable communication state.

[0008] The technical objectives of the embodiments disclosed in this document are not limited to the technical tasks mentioned above, and other technical tasks not mentioned will be clearly understood by those skilled in the art from the descriptions below.

[0009] According to some embodiments, a battery diagnosis device includes an interface configured to acquire battery data from a battery to be diagnosed at each collection cycle when a current cycle is initiated; and a controller configured to determine whether the battery data passes test items at each collection cycle to generate a first count value of the current cycle, accumulate a number of times that the determination of the test items fails in the current cycle to generate a second count value of the current cycle, perform a first diagnosis on the battery to be diagnosed based on a first accumulated value of the first count value for a first cycle count, and perform a second diagnosis on the battery to be diagnosed based on a second accumulated value of the second count value for a second cycle count.

[0010] According to some embodiments, the battery to be diagnosed includes a plurality of battery cells, and the battery data includes a cell voltage and a cell temperature of each of the plurality of battery cells.

[0011] According to some embodiments, the test items include a first item regarding whether the maximum cell voltage exceeds a cell voltage upper limit, a second item regarding whether the minimum cell voltage is less than a cell voltage lower limit, a third item regarding whether the cell voltage deviation with respect to the average cell voltage exceeds a voltage deviation threshold, a fourth item regarding whether the maximum cell temperature exceeds a cell temperature upper limit, and a fifth item regarding whether the cell temperature deviation with respect to the average cell temperature exceeds a temperature deviation threshold.

[0012] According to some embodiments, the controller is configured to determine a detailed count value for each of the test items for each of the collection cycles, check a test item among the test items whose detailed count value exceeds a threshold count of each of the test items as a failure in the current cycle, and perform the first diagnosis based on the number of failures of the test items for the first cycle number up to the current cycle.

[0013] According to some embodiments, the controller is configured to perform the first diagnosis if there is a test item among the test items that is checked as defective in all of the first cycle counts.

[0014] According to some embodiments, the controller is configured to perform the second diagnosis if the second accumulated value of the second count value for the second number of cycles exceeds a second diagnostic threshold for each of the test items.

[0015] In some embodiments, the second cycle count is greater than the first cycle count, and the second diagnostic threshold of each of the test items is the product of the threshold count of each of the test items and the first cycle count.

[0016] According to some embodiments, the controller is configured to change the state of the diagnosed battery to a thermal event early alarm state based on at least one of the first diagnosis and the second diagnosis.

[0017] According to some embodiments, a battery diagnosis method includes the steps of: collecting battery data from a battery to be diagnosed at each collection cycle when a current cycle is initiated; determining whether the battery data passes test items at each collection cycle to generate a first count value of the current cycle; accumulating a number of times that the test items fail to be determined in the current cycle to generate a second count value of the current cycle; performing a first diagnosis on the battery to be diagnosed based on a first accumulated value of the first count value for a first cycle count; and performing a second diagnosis on the battery to be diagnosed based on a second accumulated value of the second count value for a second cycle count.

[0018] According to some embodiments, the battery to be diagnosed includes a plurality of battery cells, and the battery data includes a cell voltage and a cell temperature of each of the plurality of battery cells.

[0019] According to some embodiments, the test items include a first item regarding whether the maximum cell voltage exceeds a cell voltage upper limit, a second item regarding whether the minimum cell voltage is less than a cell voltage lower limit, a third item regarding whether the cell voltage deviation with respect to the average cell voltage exceeds a voltage deviation threshold, a fourth item regarding whether the maximum cell temperature exceeds a cell temperature upper limit, and a fifth item regarding whether the cell temperature deviation with respect to the average cell temperature exceeds a temperature deviation threshold.

[0020] According to some embodiments, the step of performing the first diagnosis includes the steps of: determining a detailed count value for each of the test items for each of the collection cycles; checking a test item among the test items, the detailed count value of which exceeds a threshold count of each of the test items, as a failure in the current cycle; and performing the first diagnosis based on the number of failures of the test items for the number of first cycles up to the current cycle.

[0021] According to some embodiments, the step of performing the first diagnosis includes the step of performing the first diagnosis if there is a test item among the test items that is checked as defective in all of the first cycle counts.

[0022] According to some embodiments, the step of performing the second diagnosis comprises the step of performing the second diagnosis if the second accumulated value of the second count value for the second number of cycles exceeds a second diagnosis threshold for each of the test items.

[0023] In some embodiments, the second cycle count is greater than the first cycle count, and the second diagnostic threshold of each of the test items is the product of the threshold count of each of the test items and the first cycle count.

[0024] According to some embodiments, the method further comprises changing the state of the battery to be diagnosed to a thermal event early alarm state based on at least one of the first diagnosis and the second diagnosis.

[0025] According to the embodiments disclosed in this document, a battery diagnostic device and a battery diagnostic method can be provided that can diagnose an overheating event more accurately even when battery data collection is poor due to an unstable communication state.

[0026] The technical effects according to the embodiments disclosed in this document are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art according to the disclosure of this document.

[0027] FIG. 1 may illustrate elements constituting a battery diagnostic system according to some embodiments.

[0028] FIG. 2 may illustrate elements constituting a battery diagnostic device according to some embodiments.

[0029] FIG. 3 may illustrate a process for performing an early alarm for a thermal event through a first diagnosis and a second diagnosis according to some embodiments.

[0030] FIG. 4 may illustrate detection criteria and detailed count values ​​of test items according to some embodiments.

[0031] FIG. 5 may illustrate how count values ​​for cell high voltage testing may change as cycles progress according to some embodiments.

[0032] FIG. 6 may illustrate steps of a battery diagnosis method according to some embodiments.

[0033] Hereinafter, embodiments described in this document are described with reference to the attached drawings. However, this is not intended to limit the disclosure of this document to specific embodiments, and it should be understood that various modifications, equivalents, and / or alternatives of the embodiments described in this document are included.

[0034] The embodiments and terminology used in this document are not intended to limit the technical features described in this document to a specific embodiment, but should be understood to encompass various modifications, equivalents, or alternatives of the embodiment. In connection with the description of the drawings, similar reference numerals may be used to refer to similar or related components. The singular form of a noun corresponding to an item may include one or more of the item, unless the context clearly indicates otherwise.

[0035] In this document, the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can each include any one of the items listed together in that phrase, or all possible combinations thereof. Terms such as "first", "second", "first", "second", "A", "B", "(a)", or "(b)" may be used merely to distinguish the corresponding component from other corresponding components, and do not limit the corresponding components in any other respect (e.g., importance or order) unless specifically stated otherwise.

[0036] 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 “coupled” or “connected,” it means that the component can be connected to the other component directly (e.g., wired or wirelessly), or indirectly (e.g., via a third component).

[0037] The methods according to various embodiments disclosed in this document may be provided as a computer program product. The computer program product may be traded as a commodity 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 driver 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 a relay server.

[0038] According to the embodiments disclosed in this document, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to the embodiments disclosed in this document, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations 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 this case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to the embodiments disclosed in this document, 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 one or more other operations may be added.

[0039] FIG. 1 may illustrate elements constituting a battery management system according to some embodiments.

[0040] Referring to FIG. 1, the battery diagnosis system (100) may include a power usage device (110), a battery to be diagnosed (120), and a battery diagnosis device (130). However, the present invention is not limited thereto, and some components may be omitted from the battery diagnosis system (100) or other general-purpose components may be further included in the battery diagnosis system (100).

[0041] A battery diagnosis system (100) may refer to a system for diagnosing a battery (120) to be diagnosed and managing its status. When the battery (120) to be diagnosed is charged or discharged by a power usage device (110), battery data of the battery (120) to be diagnosed can be measured and analyzed by a battery diagnosis device (130).

[0042] The power usage device (110) may be configured to charge or discharge the battery (120) to be diagnosed. The power usage device (110) may discharge the battery (120) to be diagnosed while consuming power, and may charge the battery (120) to be diagnosed while generating power. According to an embodiment, the power usage device (110) may include a mobility device such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or an electric bike. The mobility device may drive a motor based on the power of the battery (120) to be diagnosed, or charge the battery (120) to be diagnosed with power generated through regenerative braking.

[0043] The battery to be diagnosed (120) may include a battery pack or the like that is the target of diagnosis by the battery diagnosis system (100). The battery pack of the battery to be diagnosed (120) may include a plurality of battery modules, and each battery module may include a plurality of battery cells. According to an embodiment, the battery to be diagnosed (120) may be mounted on various types of mobility devices.

[0044] The battery diagnostic device (130) can perform operations for diagnosing or managing the battery (120) to be diagnosed. The battery diagnostic device (130) can measure battery data from the battery (120) to be diagnosed, and diagnose or manage the status of the battery (120) to be diagnosed based on the measured battery data.

[0045] The battery diagnosis system (100) may further include a management server. The management server may manage the diagnostic results of the battery diagnosis device (130). The management server may exchange data with the battery diagnosis device (130) via wired / wireless communication. When a defect in the battery (120) to be diagnosed is diagnosed or its lifespan is predicted, the results may be transmitted to the management server and recorded in a database.

[0046] According to an embodiment, the management server may perform operations for managing the battery (120) to be diagnosed on behalf of the battery diagnosis device (130). According to an embodiment, the operations of the battery diagnosis device (130) may be performed by a charging device of a battery charging station. According to an embodiment, the battery diagnosis device (130) may perform the diagnostic operations by executing battery management software, and the management server may provide update information of the battery management software to the battery diagnosis device (130).

[0047] FIG. 2 may illustrate elements constituting a battery diagnostic device according to some embodiments.

[0048] Referring to FIG. 2, the battery diagnostic device (130) may include an interface (131) and a controller (132). However, the present invention is not limited thereto, and some components may be omitted from the battery diagnostic device (130), or other general-purpose components may be further included in the battery diagnostic device (130).

[0049] The battery diagnostic device (130) may be a battery management system (BMS) configured together with the battery to be diagnosed (120) in an on-board form, or the battery diagnostic device (130) may be an external device configured remotely from the battery to be diagnosed (120) in an off-board form. According to an embodiment, the external device may include a battery management server, a battery diagnostic device, a battery charging device, etc. The battery management server may include a cloud server operating in a cloud computing environment. According to an embodiment, in the battery diagnostic device (130), the interface (131) and the controller (132) may be electrically connected to each other through a device-to-device communication method. The device-to-device communication method may include a bus, a general purpose input and output (GPIO), a serial peripheral interface (SPI), a mobile industry processor interface (MIPI), etc.

[0050] The interface (131) can obtain battery data of the battery (120) to be diagnosed. According to an embodiment, the interface (131) may include at least one of a communication unit configured to receive battery data and a sensor unit configured to measure battery data. According to an embodiment, when the battery diagnosis device (130) is implemented in an off-board form, the communication unit may receive battery data in a manner such as wired data communication or wireless data communication. Alternatively, when the battery diagnosis device (130) is implemented in an on-board form, the sensor unit may be configured to generate various battery measurement values ​​from the battery (120) to be diagnosed. To this end, the sensor may include measurement means such as a voltage sensor, a current sensor, and a temperature sensor.

[0051] The controller (132) may have a structure for executing commands that implement the operations of the battery diagnostic device (130). The controller (132) may be implemented as an array of multiple logic gates for processing various operations or as a general-purpose microprocessor, and may be composed of a single processor or multiple processors. For example, the controller (132) may be implemented in the form of at least one of a microprocessor, a CPU, a GPU, and an AP.

[0052] The controller (132) can operate with a memory configured to store various data, commands, mobile applications, computer programs, etc. The memory can be configured separately from or integrally with the controller (132). The controller (132) can process various operations by executing commands stored in the memory. For example, the memory can be implemented as a non-volatile device such as a ROM, a PROM, an EPROM, an EEPROM, a flash memory, a PRAM, an MRAM, an RRAM, an FRAM, etc., or a volatile device such as a DRAM, an SRAM, an SDRAM, a PRAM, etc., and can be implemented in the form of an HDD, an SSD, an SD, a Micro-SD, etc., or a combination thereof.

[0053] The interface (131) may be configured to acquire battery data from the battery to be diagnosed (120) at each collection cycle once the current cycle begins. The current cycle may be a driving cycle of an electric vehicle (EV), etc. Battery data may be collected at each collection cycle of the current cycle. For example, the collection cycle may be 1 second, or another appropriate value may be utilized depending on the design.

[0054] The controller (132) may be configured to determine whether the battery data passes the test items at each collection cycle and generate a first count value for the current cycle. For example, the battery data may include cell voltage and cell temperature, the test items may include five items, and the collection cycle may be 1 second. Every second, it may be determined whether any of the five items fails the test, and the data may be recorded. For example, the current cycle may last for 30 minutes, and the first count value may be calculated based on the number of failures of the test items.

[0055] The controller (132) may be configured to generate a second count value of the current cycle by accumulating the number of times that the judgment of the test items fails in the current cycle. The judgment of the test items may fail due to various reasons, such as an internal defect of the battery to be diagnosed (120), a malfunction of the interface (131), or a communication failure of the battery diagnostic device (130). Since a judgment failure may lead to missing an opportunity for a defect diagnosis, a second count value may be generated based on the number of judgment failures for overheating diagnosis that takes this into consideration.

[0056] The controller (132) may be configured to perform a first diagnosis on the battery to be diagnosed (120) based on a first accumulated value of a first count value for a first cycle count. The first accumulated value of the first count value may indicate how many test items pass or fail, which may indicate an overheating risk of the battery to be diagnosed (120). For example, the first cycle count may be 5, which may include 4 past cycles and 1 current cycle. The specific value of the first cycle count may vary depending on the diagnostic accuracy requirement.

[0057] The controller (132) may be configured to perform a second diagnosis on the battery (120) to be diagnosed based on a second accumulated value of the second count value for the second cycle count. A higher second accumulated value of the second count value may indicate an increase in data collection failures, which may indicate a higher risk of missing overheating diagnosis. Reflecting this, a second diagnosis based on the second accumulated value may be performed. For example, the second cycle count may be 10, but may be changed to another value depending on the design. The second cycle count may be greater than the first cycle count.

[0058] According to an embodiment, the battery to be diagnosed (120) may include a plurality of battery cells, and the battery data may include a cell voltage and a cell temperature of each of the plurality of battery cells. Battery diagnostic indices may be derived based on the cell voltage and cell temperature of each battery cell, and whether test items pass or fail may be determined based on the battery diagnostic indices. The battery diagnostic indices may include a maximum cell voltage, a minimum cell voltage, a cell voltage deviation compared to an average cell voltage, a maximum cell temperature, a cell temperature deviation compared to an average cell temperature, and the like.

[0059] According to an embodiment, the test items may include a first item regarding whether a maximum cell voltage exceeds a cell voltage upper limit, a second item regarding whether a minimum cell voltage is less than a cell voltage lower limit, a third item regarding whether a cell voltage deviation with respect to an average cell voltage exceeds a voltage deviation threshold, a fourth item regarding whether a maximum cell temperature exceeds a cell temperature upper limit, and a fifth item regarding whether a cell temperature deviation with respect to an average cell temperature exceeds a temperature deviation threshold. The test items may be monitored to diagnose an overheating event of a battery to be diagnosed (120).

[0060] According to an embodiment, the controller (132) may be configured to determine a detailed count value for each of the test items for each collection cycle, check a test item whose detailed count value among the test items exceeds a threshold count of each of the test items as a defect in the current cycle, and perform a first diagnosis based on the number of defects of the test items for the first cycle number up to the current cycle. If the collection cycle is 1 second and there are 5 test items, whether the 5 items pass or fail the test may be determined every second. For example, if the number of times the 1st test item fails the test during the current cycle of 30 minutes is 25, the detailed count value of the 1st test item may be 25. If the threshold count of the 1st test item is 20, the 1st test item may be checked as a defect in the current cycle because the detailed count value exceeds the threshold count. The first diagnosis may be performed based on the cumulative number of defects of the 5 items during the 1st cycle number.

[0061] In an embodiment, the controller (132) may be configured to perform a first diagnosis if any of the test items are checked as defective in all first cycle counts. For example, the first cycle count may be 5, which may include 4 past cycles and 1 current cycle. If any of the 5 test items are checked as defective in all 5 cycles, the first diagnosis may be performed on the battery to be diagnosed (120), which may indicate that the battery to be diagnosed (120) is at risk of an overheating event.

[0062] According to an embodiment, the controller (132) may be configured to perform a second diagnosis if a second accumulated value of a second count value for a second cycle count exceeds a second diagnostic threshold for each of the test items. For example, the second cycle count may be 10, and the second count value may be accumulated for 10 cycles. The second accumulated value may be generated for each of the test items. For example, if there are five second accumulated values ​​for five test items, the five second accumulated values ​​may be compared with the five second diagnostic thresholds, respectively. If, among the five test items, there is a test item whose second accumulated value exceeds the second diagnostic threshold, a second diagnosis may be performed on the battery (120) to be diagnosed. The second diagnosis may indicate that the battery (120) to be diagnosed has a risk of overheating due to missing data collection.

[0063] In an embodiment, the second cycle count may be greater than the first cycle count, and the second diagnostic threshold for each of the test items may be the product of the threshold count and the first cycle count for each of the test items. The threshold count and the first cycle count may be used for the first diagnosis, while the second diagnostic threshold may be used for the second diagnosis. By setting the second diagnostic threshold as the product of the threshold count and the first cycle count, the parameters of the first diagnosis and the parameters of the second diagnosis may be correlated. Through this, the risk of overheating due to a test item failure and the risk of overheating due to poor data collection may be correlated with each other.

[0064] In an embodiment, the controller (132) may be configured to change the state of the battery (120) to be diagnosed to a thermal event early alarm state based on at least one of the first diagnosis and the second diagnosis. Since the thermal event early alarm state reflects both the first diagnosis and the second diagnosis, the risk of overheating due to test item failure and the risk of overheating due to poor data collection may be considered together.

[0065] FIG. 3 may illustrate a process for performing an early alarm for a thermal event through a first diagnosis and a second diagnosis according to some embodiments.

[0066] Referring to FIG. 3, a flow (300) representing a process for performing an early alarm for a thermal event through a first diagnosis and a second diagnosis may be illustrated. The flow (300) may include steps (310) to (380).

[0067] In step (310), a monitoring loop for the battery to be diagnosed (120) may be initiated. For example, the monitoring loop may correspond to driving of an electric vehicle and may correspond to the current cycle. In step (320), it may be determined whether the test items pass or fail. In step (330), it may be determined whether there is a result that at least one item fails (result ≥ 1) or does not pass (result < 1). In step (340), it may be determined whether the accumulated value of the failure count for 5 or more cycles is 5 or more. If Y, a thermal event early alarm may be performed in step (370), and if N, the monitoring loop may proceed to step (380) to terminate. The continuous failure count may refer to the accumulated failure count.

[0068] In step (350), if there are no failed test items, it can be determined whether 10 cycles (the second cycle count) have elapsed. If so (N), the monitoring loop can be terminated in step (380). If not so (Y), the continuous failure count value can be compared with a second diagnostic threshold in step (360). The second diagnostic threshold can be calculated as (test-specific detailed count value * 5 times). This may be to consider the risk of overheating due to data collection failure with respect to the second diagnostic. In case of Y, a thermal event early alarm can be performed in step (370), and in case of N, the monitoring loop can be terminated in step (380).

[0069] FIG. 4 may illustrate detection criteria and detailed count values ​​of test items according to some embodiments.

[0070] Referring to FIG. 4, a graph (400) illustrating detection criteria and detailed count values ​​of test items can be illustrated.

[0071] The graph (400) can display five test items. The five test items can be a cell high voltage test, a cell low voltage test, a cell voltage deviation test, a cell high temperature test, and a cell temperature deviation test.

[0072] Graph (400) can display detection criteria for five test items. For example, in the case of a cell high voltage test, it can be determined whether a battery cell among multiple battery cells has a cell voltage exceeding 4.5 V. In a similar manner, the remaining four test items can also be determined.

[0073] The graph (400) can display detailed count values ​​for five test items. For example, in the case of the cell high voltage test, the presence of a battery cell exceeding 4.5 V per collection period (e.g., 1 second) in the current cycle (e.g., 30 minutes of driving time of an electric vehicle) can be counted. If the count value of the cell high voltage test in the current cycle exceeds the detailed count value of 20, the cell high voltage test can be checked as defective.

[0074] Meanwhile, cell voltage deviation tests and cell temperature deviation tests may have relatively high detailed count values ​​due to the nature of the tests. The detection criteria numerical values ​​and detailed count values ​​illustrated in graph (400) may be changed to other appropriate values ​​depending on the design.

[0075] FIG. 5 may illustrate how count values ​​for cell high voltage testing may change as cycles progress according to some embodiments.

[0076] A graph (500) may be shown illustrating how count values ​​for cell high voltage testing change as cycles progress.

[0077] The third row of the graph (500) may represent a continuous failure count, which may mean a cumulative failure count. The fourth row of the graph (500) may represent a continuous failure count value, which may mean a cumulative value of a first count value (e.g., a detailed count value of the graph (400)).

[0078] Graph (500) may exemplarily display only the cell high voltage test among the five test items. Since the cell high voltage test failed in all five cycles (driving cycles 1-5), the cumulative failure count in driving cycle 5 may be 5. This may satisfy the criteria for the first diagnosis for the battery to be diagnosed (120), and may indicate that the battery to be diagnosed (120) currently has an overheating risk.

[0079] The graph (500) may display the accumulation of the first count value in the lowest row. If the accumulated failure count is less than 5 in driving cycle 5, the first diagnosis may not be performed. In this case, if the number of times battery data collection fails over 10 cycles (the number of second cycles) exceeds 100 (20*5), the second diagnosis may be performed. This allows the second diagnosis to analyze the risk due to data collection failure even when the risk is low from the perspective of the first diagnosis.

[0080] FIG. 6 may illustrate steps of a battery diagnosis method according to some embodiments.

[0081] Referring to FIG. 6, the battery diagnosis method (600) may include steps (610) to (650). However, the present invention is not limited thereto, and some steps may be omitted or other general steps may be added, and the steps of the battery diagnosis method (600) may be executed in a different order than the illustrated order.

[0082] The battery diagnosis method (600) may be composed of steps that are processed in a time-series manner in the battery diagnosis device (130). Therefore, even if the content is omitted below, the content described above for the battery diagnosis device (130) may be equally applied to the battery diagnosis method (600).

[0083] Steps (610) to (650) of the battery diagnosis method (600) can be performed by the interface (131) and controller (132) of the battery diagnosis device (130).

[0084] In step (610), the battery diagnostic device (130) may perform a step of acquiring battery data from the battery to be diagnosed at each collection cycle when the current cycle is initiated.

[0085] In step (620), the battery diagnostic device (130) may perform a step of determining whether battery data passes the test items for each collection cycle and generating a first count value of the current cycle.

[0086] In step (630), the battery diagnostic device (130) may perform a step of generating a second count value of the current cycle by accumulating the number of times that the judgment of the test items fails in the current cycle.

[0087] In step (640), the battery diagnosis device (130) may perform a step of performing a first diagnosis on the battery to be diagnosed based on a first accumulated value of a first count value for the first number of cycles.

[0088] In step (650), the battery diagnosis device (130) may perform a step of performing a second diagnosis on the battery to be diagnosed based on a second accumulated value of a second count value for the second cycle number.

[0089] According to an embodiment, the battery diagnosis method (600) may be implemented in the form of a computer program stored on a computer-readable storage medium. That is, the computer program may include commands for implementing the battery diagnosis method (600), and the program commands may be stored on the computer-readable storage medium. The computer program may include a mobile application.

[0090] According to an embodiment, the computer-readable storage medium may include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs, DVDs, magneto-optical media such as floptical disks, and hardware devices specially configured to store and execute computer program instructions such as ROMs, RAMs, flash memories, and the like. The computer program instructions may include machine language codes generated by a compiler and high-level language codes that can be executed by a computer using an interpreter, etc.

[0091] The terms "include," "comprise," or "have" used herein, unless otherwise specifically stated, imply that the corresponding component may be included, and therefore should be interpreted to include other components rather than to exclude 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 pertain, unless otherwise defined. Commonly used terms, such as terms defined in dictionaries, should be interpreted to be consistent with their contextual meaning in the relevant art, and shall not be interpreted in an idealized or overly formal sense, unless explicitly defined in this document.

[0092] The above description is merely an illustrative description of the technical idea disclosed in this document, and those skilled in the art to which the embodiments disclosed in this document pertain may make various modifications and variations without departing from the essential characteristics of the embodiments disclosed in this document. Therefore, the embodiments disclosed in this document are not intended to limit the technical idea of ​​the embodiments disclosed in this document, but to explain it, and the scope of the technical idea disclosed in this document is not limited by these embodiments. The protection scope of the technical idea disclosed in this document should be interpreted by the claims below, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of rights of this document.

[0093] [Explanation of symbols]

[0094] 100: Battery diagnostic system 110: Power usage device

[0095] 120: Battery to be diagnosed 130: Battery diagnostic device

[0096] 131: Sensor 132: Controller

Claims

1. An interface configured to acquire battery data from a target battery for each collection cycle when the current cycle is initiated; and At each of the above collection periods, determining whether the battery data passes the test items to generate a first count value of the current cycle, Generate a second count value of the current cycle by accumulating the number of times the judgment of the test items fails in the current cycle, Performing a first diagnosis on the battery to be diagnosed based on a first accumulated value of the first count value for the first cycle number, A battery diagnostic device comprising a controller configured to perform a second diagnosis on the battery to be diagnosed based on a second accumulated value of the second count value for the second cycle number.

2. In paragraph 1, The above diagnostic target battery includes a plurality of battery cells, A battery diagnostic device, wherein the battery data includes the cell voltage and cell temperature of each of the plurality of battery cells.

3. In paragraph 2, A battery diagnostic device, wherein the test items include a first item regarding whether the maximum cell voltage exceeds the cell voltage upper limit, a second item regarding whether the minimum cell voltage is less than the cell voltage lower limit, a third item regarding whether the cell voltage deviation with respect to the average cell voltage exceeds the voltage deviation threshold, a fourth item regarding whether the maximum cell temperature exceeds the cell temperature upper limit, and a fifth item regarding whether the cell temperature deviation with respect to the average cell temperature exceeds the temperature deviation threshold.

4. In paragraph 1, The controller determines a detailed count value for each of the test items for each collection cycle, Among the above test items, the test items whose detailed count value exceeds the threshold count of each of the above test items are checked as defective in the current cycle, A battery diagnostic device configured to perform the first diagnosis based on the number of failures of the test items for the number of first cycles up to the current cycle.

5. In paragraph 4, A battery diagnostic device, wherein the controller is configured to perform the first diagnosis when there is a test item among the test items that is checked as defective in all of the first cycle counts.

6. In paragraph 4, A battery diagnostic device, wherein the controller is configured to perform the second diagnosis when the second accumulated value of the second count value for the second number of cycles exceeds the second diagnostic threshold of each of the test items.

7. In paragraph 6, A battery diagnostic device, wherein the second cycle count is greater than the first cycle count, and the second diagnostic threshold of each of the test items is a product of the threshold count of each of the test items and the first cycle count.

8. In paragraph 1, A battery diagnostic device, wherein the controller is configured to change the state of the battery to be diagnosed to a thermal event early alarm state based on at least one of the first diagnosis and the second diagnosis.

9. A step of acquiring battery data from a target battery for diagnosis at each collection cycle when the current cycle is initiated; A step of determining whether the battery data passes the test items for each of the collection periods and generating a first count value of the current cycle; A step of generating a second count value of the current cycle by accumulating the number of times the judgment of the test items fails in the current cycle; A step of performing a first diagnosis on the battery to be diagnosed based on a first accumulated value of the first count value for the first cycle number; and A battery diagnosis method, comprising the step of performing a second diagnosis on the battery to be diagnosed based on a second accumulated value of the second count value for the second cycle number.

10. In paragraph 9, The above diagnostic target battery includes a plurality of battery cells, A battery diagnosis method, wherein the battery data includes the cell voltage and cell temperature of each of the plurality of battery cells.

11. In paragraph 10, A battery diagnosis method, wherein the above test items include a first item regarding whether the maximum cell voltage exceeds the cell voltage upper limit, a second item regarding whether the minimum cell voltage is less than the cell voltage lower limit, a third item regarding whether the cell voltage deviation with respect to the average cell voltage exceeds the voltage deviation threshold, a fourth item regarding whether the maximum cell temperature exceeds the cell temperature upper limit, and a fifth item regarding whether the cell temperature deviation with respect to the average cell temperature exceeds the temperature deviation threshold.

12. In paragraph 9, The step of performing the above first diagnosis is: A step of determining a detailed count value for each of the test items for each of the collection periods; A step of checking a test item among the above test items, wherein the detailed count value exceeds the threshold count of each of the test items, as a defect in the current cycle; and A battery diagnosis method, comprising a step of performing the first diagnosis based on the number of failures of the test items for the number of first cycles up to the current cycle.

13. In paragraph 12, The step of performing the above first diagnosis is: A battery diagnosis method, comprising a step of performing the first diagnosis when there is a test item among the above test items that is checked as defective in all of the first cycle counts.

14. In paragraph 12, The step of performing the above second diagnosis is: A battery diagnosis method, comprising the step of performing the second diagnosis when the second accumulated value of the second count value for the second cycle number exceeds the second diagnosis threshold of each of the test items.

15. In paragraph 14, A battery diagnosis method, wherein the second cycle count is greater than the first cycle count, and the second diagnostic threshold of each of the test items is a product of the threshold count of each of the test items and the first cycle count.

16. In paragraph 9, A battery diagnosis method further comprising a step of changing the state of the battery to be diagnosed to a thermal event early alarm state based on at least one of the first diagnosis and the second diagnosis.

Images