Battery diagnostic device and operating method thereof

Abstract

A battery diagnostic device according to an embodiment disclosed in the present document may comprise: an information acquisition unit for acquiring a voltage of each of a plurality of battery cells; a voltage deviation calculation unit for calculating an average of the voltages of the plurality of battery cells and calculating a first deviation on the basis of a difference between the average and the voltage of each of the plurality of battery cells; and a controller for calculating, every first period, a first variance corresponding to a variance of the first deviation of each of the plurality of battery cells, calculating, every second period different from the first period, a second variance corresponding to the variance of the first deviation of each of the plurality of battery cells, and diagnosing an abnormality of the plurality of battery cells on the basis of the first variance and the second variance.

Description

Battery diagnostic device and its operating method

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2023-0183552, filed December 15, 2023, the entire contents of which are incorporated herein by reference.

[0003] Technology field

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

[0005] Recently, research and development on secondary batteries has been actively conducted. Here, secondary batteries are rechargeable and include both conventional Ni / Cd and Ni / MH batteries, as well as recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of having a much higher energy density than conventional Ni / Cd and Ni / MH batteries. Furthermore, lithium-ion batteries can be manufactured in a compact and lightweight form, making them suitable for use as 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] If a micro-internal short circuit occurs in a battery cell, current leakage can occur regardless of whether the battery is in use. Consequently, a battery cell with a micro-internal short circuit self-discharges, gradually lowering its voltage level compared to other cells in the battery pack. Furthermore, since a battery cell with a micro-internal short circuit can short circuit, it is important to detect it before the risk increases.

[0007] One purpose of the embodiments disclosed in this document is to provide a battery diagnostic device and an operating method thereof that can solve the problem of making diagnosis difficult because the voltage of a battery cell slightly decreases in the case of a micro-internal short circuit and thus does not self-discharge to the voltage deviation diagnosis level.

[0008] One purpose of the embodiments disclosed in this document is to provide a battery diagnostic device and an operating method thereof capable of performing short-term internal short-circuit diagnosis and long-term internal short-circuit diagnosis based on a deviation in voltage between battery cells.

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

[0010] A battery diagnosis device according to one embodiment disclosed in the present document may include an information acquisition unit that acquires the voltage of each of a plurality of battery cells, a voltage deviation calculation unit that calculates an average of the voltages of the plurality of battery cells and calculates a first deviation as a difference between the average and the voltage of each of the plurality of battery cells, and a controller that calculates a first variation corresponding to the variation in the first variation of each of the plurality of battery cells for each first period, calculates a second variation corresponding to the variation in the first variation of each of the plurality of battery cells for each second period different from the first period, and performs an abnormality diagnosis of the plurality of battery cells based on the first variation and the second variation.

[0011] In one embodiment, the controller can perform different abnormality diagnoses of the plurality of battery cells based on each of the first variation amount and the second variation amount.

[0012] In one embodiment, the controller can diagnose whether an internal short circuit causing rapid discharge has occurred in each of the plurality of battery cells based on the first change amount, and can diagnose whether a micro-internal short circuit has occurred in each of the plurality of battery cells based on the second change amount.

[0013] In one embodiment, the second period may be longer than the first period.

[0014] In one embodiment, the controller further includes a storage unit that stores a first reference deviation of the plurality of battery cells and a second reference deviation of the plurality of battery cells, and the controller calculates the first variation as a difference between the first reference deviation of the plurality of battery cells and the first deviation of each of the plurality of battery cells for each first period, and calculates the second variation as a difference between the second reference deviation of the plurality of battery cells and the first deviation of each of the plurality of battery cells for each second period.

[0015] In one embodiment, the controller may update the first reference deviation of the plurality of battery cells with the first deviation of each of the plurality of battery cells at each of the second periods.

[0016] In one embodiment, the second reference deviation of each of the plurality of battery cells may be a fixed value.

[0017] An operating method of a battery diagnosis device according to an embodiment disclosed in the present document may include an operation of acquiring a voltage of each of a plurality of battery cells, an operation of calculating an average of the voltages of the plurality of battery cells and calculating a first deviation as a difference between the average and the voltage of each of the plurality of battery cells, an operation of calculating a first variation corresponding to an amount of variation in the first variation of each of the plurality of battery cells for each first period, an operation of calculating a second variation corresponding to an amount of variation in the first variation of each of the plurality of battery cells for each second period different from the first period, and an operation of performing an abnormality diagnosis of the plurality of battery cells based on the first variation and the second variation.

[0018] In one embodiment, the operation of performing abnormality diagnosis of the plurality of battery cells based on the first change amount and the second change amount may perform different abnormality diagnoses of the plurality of battery cells based on each of the first change amount and the second change amount.

[0019] In one embodiment, the operation of performing an abnormality diagnosis of the plurality of battery cells based on the first change amount and the second change amount may include an operation of diagnosing whether an internal short circuit causing rapid discharge has occurred in each of the plurality of battery cells based on the first change amount and an operation of diagnosing whether a micro-internal short circuit has occurred in each of the plurality of battery cells based on the second change amount.

[0020] In one embodiment, the second period may be longer than the first period.

[0021] In one embodiment, the method further includes storing a first reference deviation of the plurality of battery cells and a second reference deviation of the plurality of battery cells, and the operation of calculating a first variation corresponding to the variation in the first deviation of each of the plurality of battery cells for each first period may calculate the first variation as a difference between the first reference deviation of the plurality of battery cells and the first variation of each of the plurality of battery cells for each first period, and the operation of calculating a second variation corresponding to the variation in the first variation of each of the plurality of battery cells for each second period different from the first period may calculate the second variation as a difference between the second reference deviation of the plurality of battery cells and the first variation of each of the plurality of battery cells for each second period.

[0022] In one embodiment, the method may further include updating the first reference deviation of the plurality of battery cells with the first deviation of each of the plurality of battery cells for each of the second periods.

[0023] In one embodiment, the second reference deviation of each of the plurality of battery cells may be a fixed value.

[0024] A battery diagnostic device and its operating method according to one embodiment disclosed in this document can diagnose a microscopic internal short circuit of a battery cell that microscopically self-discharges over a long period of time.

[0025] A battery diagnostic device and its operating method according to one embodiment disclosed in this document can simultaneously diagnose short-term internal short circuits and micro-internal short circuits of battery cells based on changes in voltage deviations between battery cells.

[0026] In addition, various effects may be provided, either directly or indirectly, through this document.

[0027] Figure 1 is a block diagram showing the configuration of a typical battery pack.

[0028] FIG. 2 is a drawing showing a battery diagnostic device according to one embodiment disclosed in this document.

[0029] FIG. 3 is a drawing showing an example of a battery diagnostic device according to one embodiment disclosed in this document diagnosing a plurality of battery cells.

[0030] FIG. 4 is a flowchart showing an operation method of a battery diagnostic device according to one embodiment disclosed in this document.

[0031] FIG. 5 is a flowchart specifically showing an operation method of a battery diagnostic device according to one embodiment disclosed in this document.

[0032] FIG. 6 is a block diagram showing the hardware configuration of a computing system for performing an operating method of a battery diagnostic device according to one embodiment disclosed in this document.

[0033] Hereinafter, embodiments disclosed in this document will be described in detail with reference to exemplary drawings. When designating components in each drawing, it should be noted that, where possible, identical components are given the same reference numerals, even if they appear in different drawings. Furthermore, when describing embodiments disclosed in this document, detailed descriptions of related known structures or functions will be omitted if they are deemed to hinder understanding of the embodiments disclosed in this document.

[0034] In describing the components of the embodiments disclosed in this document, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components and do not limit the nature, order, or sequence of the components. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed in this document belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this application.

[0035] Figure 1 is a block diagram showing the configuration of a typical battery pack.

[0036] Referring to FIG. 1, a battery control system including a battery pack (1) and an upper controller (2) included in an upper system according to one embodiment of the present invention is schematically illustrated.

[0037] As illustrated in FIG. 1, a battery pack (1) is composed of one or more battery cells and includes a plurality of battery cells (10) that are rechargeable and dischargeable, a switching unit (14) that is connected in series to the (+) terminal side or the (-) terminal side of the plurality of battery cells (10) to control the charge and discharge current flow of the plurality of battery cells (10), and a battery management system (20) that monitors the voltage, current, temperature, etc. of the battery pack (1) and controls and manages to prevent overcharging, overdischarging, etc. In this case, the battery pack (1) may be equipped with a plurality of battery cells (10), sensors (12), switching units (14), and battery management systems (20).

[0038] Here, the switching unit (14) is a device for controlling the current flow for charging or discharging of a plurality of battery cells (10), and for example, at least one relay, magnetic contactor, etc. may be used depending on the specifications of the battery pack (1).

[0039] The battery management system (20) is an interface that receives values ​​measured from the various parameters described above, and may include a plurality of terminals and a circuit that is connected to the terminals and processes the values ​​received. In addition, the battery management system (20) may control the ON / OFF of a switching unit (14), for example, a relay or a contactor, and may be connected to a plurality of battery cells (10) and monitor the status of each of the plurality of battery cells (10). According to an embodiment, the battery management system (20) may include the battery diagnosis device (100) of FIG. 2. According to another embodiment, the battery management system (20) may be a different system from the battery diagnosis device (100) of FIG. 2. That is, the battery diagnosis device (100) of FIG. 2 may be included in the battery pack (1) or may be configured as another device external to the battery pack (1). In addition, the operation of the battery diagnostic device (100) below can be performed by a BMS (Battery management system) in a vehicle, and can also be performed in various devices such as a server, cloud, charger, or charger / discharger.

[0040] The upper controller (2) can transmit control signals for multiple battery cells (10) to the battery management system (20). Accordingly, the battery management system (20) can be controlled in operation based on the signals received from the upper controller (2).

[0041] FIG. 2 is a drawing showing a battery diagnostic device according to one embodiment disclosed in this document.

[0042] The battery diagnostic device (100) may be a variety of electronic devices for diagnosing or testing a battery. For example, the battery diagnostic device (100) may be included in a battery management system (BMS) within a vehicle, but may also be implemented as a separate external device distinct from the BMS within the vehicle.

[0043] According to another embodiment, the battery diagnostic device (100) may be included in a device for charge / discharge testing, such as a server, a cloud server, or a charge / discharge cycler, or may be included in various devices for diagnosing or testing batteries.

[0044] Referring to FIG. 2, the battery diagnostic device (100) may include an information acquisition unit (110), a voltage deviation calculation unit (120), and a controller (130). According to an embodiment, the battery diagnostic device (100) may further include a storage unit (140).

[0045] The information acquisition unit (110) can acquire the voltage of each of the plurality of battery cells. For example, the information acquisition unit (110) can acquire the voltage of each of the plurality of battery cells at a set cycle. As another example, the information acquisition unit (110) can acquire the open circuit voltage of each of the plurality of battery cells.

[0046] According to an embodiment, the information acquisition unit (110) may acquire the open circuit voltage of each of the plurality of battery cells at a first interval and may acquire the open circuit voltage of each of the plurality of battery cells at a second interval. For example, the first interval may be 1 day and the second interval may be 30 days, but is not limited thereto.

[0047] In some embodiments, the second period may be an integer multiple of the first period.

[0048] The voltage deviation calculation unit (120) can calculate an average of the voltages of multiple battery cells. For example, the voltage deviation calculation unit (120) can calculate an average of the voltages of multiple battery cells at a set point in time.

[0049] The voltage deviation calculation unit (120) can calculate the first deviation as the difference between the calculated average and the voltage of each of the plurality of battery cells. For example, the voltage deviation calculation unit (120) can calculate the first deviation for each of the plurality of battery cells.

[0050] According to an embodiment, the voltage deviation calculation unit (120) can receive a set time and the voltage of each of the plurality of battery cells, and can calculate the first deviation of each of the plurality of battery cells to correspond to the set time. In addition, the voltage deviation calculation unit (120) can transmit the first deviation of each of the plurality of battery cells corresponding to the set time to the controller (130).

[0051] According to an embodiment, the voltage deviation calculation unit (120) may be a component included in the controller (130). According to another embodiment, the operation of the voltage deviation calculation unit (120) may be performed in the controller (130).

[0052] The controller (130) may calculate a first change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells for each first period. In addition, the controller (130) may calculate a second change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells for each second period that is different from the first period. For example, the first period may be 1 day, and the second period may be 30 days, but is not limited thereto. In an embodiment, the second period may be longer than the first period.

[0053] The controller (130) can perform abnormality diagnosis of a plurality of battery cells based on the first variation amount and the second variation amount. For example, the controller (130) can perform different abnormality diagnoses of a plurality of battery cells based on each of the first variation amount and the second variation amount. That is, the controller (130) can perform a first abnormality diagnosis of a plurality of battery cells based on the first variation amount, and can perform a second abnormality diagnosis of a plurality of battery cells based on the second variation amount.

[0054] According to an embodiment, the controller (130) can diagnose whether an internal short circuit causing rapid discharge has occurred in each of the plurality of battery cells based on a first amount of change. Furthermore, the controller (130) can diagnose whether a micro-internal short circuit has occurred in each of the plurality of battery cells based on a second amount of change. That is, the controller (130) can diagnose a rapid internal short circuit based on a first amount of change in the first deviation during a first period, and can diagnose a micro-internal short circuit based on a second amount of change in the first deviation during a second period that is longer than the first period.

[0055] The storage unit (140) may store a first reference deviation of a plurality of battery cells and a second reference deviation of a plurality of battery cells. For example, the first reference deviation may be a value used when calculating the first change amount, and the second reference deviation may be a value used when calculating the second change amount. For example, the second reference deviation may be a fixed value. In an embodiment, the second reference deviation may be set during battery production and remain a fixed value until the battery is discarded.

[0056] In an embodiment, the first reference deviation may be set to the first deviation of each of the plurality of battery cells at a specific point in time. For example, the first reference deviation may be set to the first deviation of each of the plurality of battery cells at the first diagnostic point in time.

[0057] In an embodiment, the first reference deviation may be updated with the first deviation of each of the plurality of battery cells at a given point in time at set intervals. For example, the first reference deviation may be updated with the first deviation of the plurality of battery cells at a given point in time at set intervals.

[0058] The controller (130) can calculate a first variation amount as a difference between a first reference deviation of the plurality of battery cells and the first deviation of each of the plurality of battery cells for each first period. In addition, the controller (130) can calculate a second variation amount as a difference between a second reference deviation of the plurality of battery cells and the first deviation of each of the plurality of battery cells for each second period.

[0059] According to an embodiment, the controller (130) can diagnose that an internal short circuit has occurred in a battery cell among a plurality of battery cells in which a first change amount is greater than or equal to a first threshold value.

[0060] According to an embodiment, the controller (130) can diagnose that a micro-internal short circuit has occurred in a battery cell among the plurality of battery cells in which the second variation is greater than or equal to the second threshold value.

[0061] A battery diagnostic device (100) according to one embodiment disclosed in this document can diagnose micro-internal short circuits in battery cells that self-discharge minutely over a long period of time.

[0062] A battery diagnostic device (100) according to one embodiment disclosed in this document can simultaneously diagnose short-term internal short circuits and micro-internal short circuits of battery cells based on changes in voltage deviations between battery cells.

[0063] FIG. 3 is a drawing showing an example of a battery diagnostic device according to one embodiment disclosed in this document diagnosing a plurality of battery cells.

[0064] Referring to FIG. 3, the information acquisition unit (110) of the battery diagnostic device (100) can acquire the voltages (OCVf, OCVs, etc.) of multiple battery cells.

[0065] The voltage deviation calculation unit (120) can calculate the average of the voltages (OCVm) of multiple battery cells and calculate the first deviation (dVs, dVm) as the difference between the average and the voltages (OCVs, OCVm) of each of the multiple battery cells.

[0066] The voltage (OCVf) of each of the plurality of battery cells that is acquired first may be stored in the storage unit (140). In addition, the storage unit (140) may store a second reference deviation of each of the plurality of battery cells that is calculated based on the voltage (OCVf) of each of the plurality of battery cells that is acquired first. For example, the second reference deviation may be calculated as the difference between the average of the voltages (OCVf) of each of the plurality of battery cells that is acquired first and the voltage (OCVf) of each of the plurality of battery cells that is acquired first.

[0067] The storage unit (140) can store the first reference deviation (dVs). For example, the first reference deviation (dVs) can be updated at set intervals. As another example, the first reference deviation (dVs) can be calculated based on the voltages (OCVs) of each of the plurality of battery cells at a set point in time. For example, the first reference deviation (dVs) can be calculated as the difference between the average of the voltages (OCVs) of each of the plurality of battery cells at a set point in time and the voltages (OCVs) of each of the plurality of battery cells at a set point in time. According to an embodiment, the first reference deviation (dVs) can be updated at a second interval.

[0068] The controller (130) can calculate a first variation corresponding to the variation in the first deviation of the plurality of battery cells for each first period. For example, the controller (130) can calculate the first variation as the difference between the first variation (dVm) of the plurality of battery cells and the first reference variation (dVs) for each first period.

[0069] Additionally, the controller (130) can diagnose each of the plurality of battery cells based on the first change amount. For example, the controller (130) can diagnose that an internal short circuit has occurred in a battery cell in which the first change amount is greater than or equal to a first threshold value (e.g., 10 mV).

[0070] The controller (130) can calculate a second variation corresponding to the first deviation of the plurality of battery cells for each second period. For example, the controller (130) can calculate the second variation based on the difference between the first deviation (dVs) of the plurality of battery cells and the second reference deviation (dVf) for each second period.

[0071] Additionally, the controller (130) can diagnose each of the plurality of battery cells based on the second change amount. For example, the controller (130) can diagnose that a micro-internal short circuit has occurred in a battery cell in which the second change amount is greater than or equal to a second threshold value (e.g., 10 mV).

[0072] FIG. 4 is a flowchart illustrating an operating method of a battery diagnostic device according to one embodiment disclosed in this document. According to the embodiment, the operations illustrated in FIG. 4 may be performed through the battery diagnostic device (100) of FIG. 2.

[0073] Referring to FIG. 4, in operation 410, the information acquisition unit (110) may acquire the voltages of multiple battery cells. For example, the information acquisition unit (110) may acquire the voltages of each of the multiple battery cells at a set cycle. As another example, the information acquisition unit (110) may acquire the open circuit voltages of each of the multiple battery cells.

[0074] According to an embodiment, the information acquisition unit (110) may acquire the open circuit voltage of each of the plurality of battery cells at a first interval and may acquire the open circuit voltage of each of the plurality of battery cells at a second interval. For example, the first interval may be 1 day and the second interval may be 30 days, but is not limited thereto.

[0075] In operation 420, the voltage deviation calculation unit (120) can calculate an average of the voltages of multiple battery cells. For example, the voltage deviation calculation unit (120) can calculate an average of the voltages of multiple battery cells at a set point in time.

[0076] Additionally, the voltage deviation calculation unit (120) can calculate the first deviation as the difference between the calculated average and the voltage of each of the plurality of battery cells. For example, the voltage deviation calculation unit (120) can calculate the first deviation for each of the plurality of battery cells.

[0077] In operation 430, the controller (130) can calculate a first change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells for each first period.

[0078] In operation 440, the controller (130) may calculate a second variation corresponding to the variation in the first deviation of each of the plurality of battery cells for a second period different from the first period. For example, the first period may be 1 day, and the second period may be 30 days, but is not limited thereto. In an embodiment, the second period may be longer than the first period.

[0079] In operation 450, the storage unit (140) may store a first reference deviation of the plurality of battery cells and a second reference deviation of the plurality of battery cells. For example, the first reference deviation of the plurality of battery cells and the second reference deviation of the plurality of battery cells may be values ​​stored in the storage unit (140) or may be values ​​calculated and stored by the controller (130). In an embodiment, operation 450 may not be performed. In another example, the first reference deviation may be a value used when calculating the first variation, and the second reference deviation may be a value used when calculating the second variation. For example, the second reference deviation may be a fixed value. In an embodiment, the second reference deviation may be a fixed value set when the battery is produced and maintained until the battery is disposed of.

[0080] In an embodiment, the first reference deviation may be set to the first deviation of each of the plurality of battery cells at a specific point in time. For example, the first reference deviation may be set to the first deviation of each of the plurality of battery cells at the first diagnostic point in time.

[0081] In an embodiment, the first reference deviation may be updated with the first deviation of each of the plurality of battery cells at a given point in time at set intervals. For example, the first reference deviation may be updated with the first deviation of the plurality of battery cells at a given point in time at set intervals.

[0082] In operation 460, the controller (130) may perform abnormality diagnosis of the plurality of battery cells based on the first variation amount and the second variation amount. For example, the controller (130) may perform different abnormality diagnoses of the plurality of battery cells based on each of the first variation amount and the second variation amount. That is, the controller (130) may perform a first abnormality diagnosis on the plurality of battery cells based on the first variation amount, and may perform a second abnormality diagnosis on the plurality of battery cells based on the second variation amount.

[0083] According to an embodiment, the controller (130) can diagnose whether an internal short circuit causing rapid discharge has occurred in each of the plurality of battery cells based on a first amount of change. Furthermore, the controller (130) can diagnose whether a micro-internal short circuit has occurred in each of the plurality of battery cells based on a second amount of change. That is, the controller (130) can diagnose a rapid internal short circuit based on a first amount of change in the first deviation during a first period, and can diagnose a micro-internal short circuit based on a second amount of change in the first deviation during a second period that is longer than the first period.

[0084] According to an embodiment, the controller (130) may calculate a first variation as a difference between a first reference deviation of the plurality of battery cells and the first deviation of each of the plurality of battery cells for each first period. In addition, the controller (130) may calculate a second variation as a difference between a second reference deviation of the plurality of battery cells and the first deviation of each of the plurality of battery cells for each second period.

[0085] FIG. 5 is a flowchart specifically illustrating an operating method of a battery diagnostic device according to one embodiment disclosed in this document. According to the embodiment, the operations illustrated in FIG. 5 may be performed through the battery diagnostic device (100) of FIG. 2.

[0086] Referring to FIG. 5, in operation 510, the controller (130) may diagnose whether an internal short circuit causing rapid discharge has occurred in each of the plurality of battery cells based on a first change amount. For example, the controller (130) may diagnose that an internal short circuit has occurred in a battery cell among the plurality of battery cells in which the first change amount is greater than or equal to a first threshold value.

[0087] In operation 520, the controller (130) may diagnose whether a micro-internal short circuit has occurred in each of the plurality of battery cells based on the second variation. For example, the controller (130) may diagnose that a micro-internal short circuit has occurred in a battery cell among the plurality of battery cells in which the second variation exceeds the second threshold value.

[0088] In operation 530, the controller (130) can update the first reference deviation of the plurality of battery cells with the first deviation of each of the plurality of battery cells every second period.

[0089] FIG. 6 is a block diagram showing the hardware configuration of a computing system for performing an operating method of a battery diagnostic device according to one embodiment disclosed in this document.

[0090] Referring to FIG. 6, a computing system (1000) according to one embodiment disclosed in the present document may include an MCU (1010), a memory (1020), an input / output I / F (1030), and a communication I / F (1040).

[0091] The MCU (1010) may be a processor that executes various programs stored in the memory (1020) (e.g., a program for measuring voltages of multiple battery cells, a program for calculating voltage deviations of multiple battery cells, a program for diagnosing multiple battery cells, etc.), and processes various information including voltages of multiple battery cells, voltage deviations of multiple battery cells, and whether or not there is an internal short circuit in multiple battery cells through these programs, and performs the functions of the controller included in the battery diagnosis device illustrated in FIG. 2 described above.

[0092] The memory (1020) can store various programs, such as a program for measuring the voltage of multiple battery cells, a program for calculating voltage deviations of multiple battery cells, and a program for diagnosing multiple battery cells. In addition, the memory (1020) can store various information, including the voltages of multiple battery cells, voltage deviations of multiple battery cells, and whether or not there is an internal short circuit in multiple battery cells.

[0093] Such memories (1020) may be provided in multiple numbers as needed. The memories (1020) may be volatile memories or non-volatile memories. As volatile memories (1020), RAM, DRAM, SRAM, etc. may be used. As non-volatile memories (1020), ROM, PROM, EAROM, EPROM, EEPROM, flash memories, etc. may be used. The examples of the memories (1020) listed above are merely examples and are not limited to these examples.

[0094] The input / output I / F (1030) can provide an interface that enables data transmission and reception between an input device (not shown) such as a keyboard, mouse, or touch panel, and an output device (not shown) such as a display and the MCU (1010).

[0095] The communication I / F (1040) is a component capable of transmitting and receiving various data with a server, and may be any device capable of supporting wired or wireless communication. For example, a battery diagnostic device can transmit and receive various information, including the voltage of multiple battery cells, voltage deviations of multiple battery cells, and whether or not there is an internal short circuit in multiple battery cells, from a separately provided external server via the communication I / F (1040).

[0096] In this way, a computer program according to one embodiment disclosed in this document may be implemented as a module that is recorded in a memory (1020) and processed by an MCU (1010) to perform each function illustrated in FIG. 2, for example.

[0097] The above description is merely an example 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.

[0098] Accordingly, the embodiments disclosed in this document are intended to illustrate, rather than limit, the technical concepts disclosed in this document, and the scope of the technical concepts disclosed in this document is not limited by these embodiments. The scope of protection of the technical concepts disclosed in this document should be interpreted by the claims below, and all technical concepts within the equivalent scope should be interpreted as being included within the scope of the rights of this document.

[0099] [Explanation of symbols]

[0100] 100: Battery Diagnostic Device

[0101] 110: Information Acquisition Department

[0102] 120: Voltage deviation calculation unit

[0103] 130: Controller

[0104] 140: Storage

[0105] 1000: Computing Systems

[0106] 1010: MCU

[0107] 1020: Memory

[0108] 1030: Input / Output I / F

[0109] 1040: Communication I / F

Claims

1. An information acquisition unit that acquires the voltage of each of multiple battery cells; A voltage deviation calculation unit that calculates an average of the voltages of the plurality of battery cells and calculates a first deviation as a difference between the average and the voltage of each of the plurality of battery cells; and For each first period, a first change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells is calculated, A second change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells is calculated for each second period different from the first period, A battery diagnosis device, comprising: a controller for performing abnormal diagnosis of the plurality of battery cells based on the first change amount and the second change amount.

2. In paragraph 1, The above controller, A battery diagnostic device that performs different abnormal diagnoses of the plurality of battery cells based on each of the first variation amount and the second variation amount.

3. In paragraph 2, The above controller, Based on the above first change amount, it is diagnosed whether an internal short circuit causing rapid discharge has occurred in each of the plurality of battery cells, A battery diagnostic device that diagnoses whether a micro-internal short circuit has occurred in each of the plurality of battery cells based on the second change amount.

4. In paragraph 1, A battery diagnostic device, wherein the second period is longer than or equal to the first period.

5. In paragraph 1, Further comprising a storage unit storing the first reference deviation of the plurality of battery cells and the second reference deviation of the plurality of battery cells; The above controller, The first variation is calculated as the difference between the first reference deviation of the plurality of battery cells and the first deviation of each of the plurality of battery cells for each first period, A battery diagnostic device that calculates the second variation amount as the difference between the second reference deviation of the plurality of battery cells and the first deviation of each of the plurality of battery cells for each second period.

6. In paragraph 5, The above controller, A battery diagnostic device that updates the first reference deviation of the plurality of battery cells with the first deviation of each of the plurality of battery cells at each of the second periods.

7. In paragraph 5, A battery diagnostic device, wherein the second reference deviation of each of the plurality of battery cells is a fixed value.

8. The operation of obtaining the voltage of each of multiple battery cells; An operation of calculating an average of voltages of the plurality of battery cells, and calculating a first deviation as a difference between the average and the voltage of each of the plurality of battery cells; An operation of calculating a first change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells for each first period; An operation of calculating a second change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells for each second period different from the first period; and An operating method of a battery diagnosis device, comprising: an operation of performing an abnormality diagnosis of the plurality of battery cells based on the first change amount and the second change amount; 9. In paragraph 9, The operation of performing an abnormal diagnosis of the plurality of battery cells based on the first change amount and the second change amount is as follows. A method of operating a battery diagnosis device, which performs different abnormal diagnoses of the plurality of battery cells based on each of the first change amount and the second change amount.

10. In Article 10, The operation of performing an abnormal diagnosis of the plurality of battery cells based on the first change amount and the second change amount is as follows. An operation of diagnosing whether an internal short circuit causing rapid discharge has occurred in each of the plurality of battery cells based on the first change amount; and An operating method of a battery diagnostic device, comprising: an operation of diagnosing whether a micro-internal short circuit has occurred in each of the plurality of battery cells based on the second variation amount; 11. In paragraph 9, A method of operating a battery diagnostic device, wherein the second period is longer than or equal to the first period.

12. In paragraph 9, Further comprising an operation of storing a first reference deviation of the plurality of battery cells and a second reference deviation of the plurality of battery cells; An operation of calculating a first change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells for each first period is as follows: The first variation is calculated as the difference between the first reference deviation of the plurality of battery cells and the first deviation of each of the plurality of battery cells for each first period, An operation of calculating a second change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells for each second period different from the first period is, An operating method of a battery diagnostic device, wherein the second variation is calculated as a difference between the second reference deviation of the plurality of battery cells and the first deviation of each of the plurality of battery cells for each second period.

13. In paragraph 12, An operating method of a battery diagnostic device, further comprising: an operation of updating a first reference deviation of the plurality of battery cells with a first deviation of each of the plurality of battery cells for each of the second periods; 14. In paragraph 12, A method of operating a battery diagnostic device, wherein the second reference deviation of each of the plurality of battery cells is a fixed value.

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