Battery diagnostic device and method of operating the same

Abstract

A battery diagnosis apparatus according to the embodiments disclosed in the present document can include 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 based on a difference between the average and the voltage of each of the plurality of battery cells; and a controller for calculating a first variation corresponding to a variation amount of the first deviation of each of the plurality of battery cells every first period; calculating a second variation corresponding to the variation amount of the first deviation of each of the plurality of battery cells every second period different from the first period; and diagnosing an abnormality performed by the plurality of battery cells based on the first variation and the second variation.

Description

Technical Field

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2023-0183552, filed on December 15, 2023, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments disclosed herein relate to battery diagnostic equipment and its operating methods. Background Technology

[0004] Recently, research and development of rechargeable batteries have been actively pursued. In this paper, rechargeable batteries, as rechargeable / dischargeable batteries, can include all conventional nickel (Ni) / cadmium (Cd) batteries, Ni / metal hydride (MH) batteries, and more recently, lithium-ion batteries. Among rechargeable batteries, lithium-ion batteries have a significantly higher energy density than conventional Ni / Cd and Ni / MH batteries. Furthermore, lithium-ion batteries can be manufactured to be small and lightweight, making them suitable for use as power sources in mobile devices. Recently, their applications have expanded to power electric vehicles, thus attracting attention as a next-generation energy storage medium.

[0005] When a tiny internal short circuit occurs in a battery cell, leakage current may occur regardless of whether the battery is in use. Therefore, a battery cell with a tiny internal short circuit is self-discharging, and its voltage level gradually decreases compared to other cells in the battery pack. Furthermore, as short circuits occur in battery cells with tiny internal short circuits, proactive detection before the risk increases is crucial. Summary of the Invention

[0006] Technical issues

[0007] The embodiments disclosed herein aim to provide a battery diagnostic device and its operating method, which can solve the following problem: self-discharge caused by a slight drop in the voltage of a battery cell in the case of a minor internal short circuit does not reach the voltage deviation diagnostic level, thus making diagnosis difficult.

[0008] The embodiments disclosed herein aim to provide a battery diagnostic device and its operating method that can perform short-term internal short-circuit diagnosis and long-term internal short-circuit diagnosis based on the voltage deviation between battery cells.

[0009] The technical problems of the embodiments disclosed herein are not limited to those described above, and those skilled in the art will clearly understand from the following description other unmentioned technical problems.

[0010] Technical solution

[0011] A battery diagnostic device according to embodiments disclosed herein includes: an information acquisition unit configured to acquire the voltage of each of a plurality of battery cells; a voltage deviation calculation unit configured to calculate an average voltage of the plurality of battery cells and calculate a first deviation as the difference between the average voltage and the voltage of each of the plurality of battery cells; and a controller configured to: calculate a first change corresponding to a change in the first deviation of each of the plurality of battery cells at first time intervals; calculate a second change corresponding to a change in the first deviation of each of the plurality of battery cells at second time intervals different from the first time intervals; and perform anomaly diagnosis on the plurality of battery cells based on the first change and the second change.

[0012] In an implementation, the controller can also be configured to perform different anomaly diagnoses on multiple battery cells based on each of the first and second changes.

[0013] In an implementation, the controller may also be configured to diagnose whether an internal short circuit with rapid discharge has occurred in each of the plurality of battery cells based on a first change, and to diagnose whether a minor internal short circuit has occurred in each of the plurality of battery cells based on a second change.

[0014] In the implementation, the second time period can be greater than or equal to the first time period.

[0015] In an embodiment, the battery diagnostic device may further include a storage unit configured to store a first reference deviation of a plurality of battery cells and a second reference deviation of a plurality of battery cells, wherein the controller is further configured to: calculate a first change amount by 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 every first time period; and calculate a second change amount by 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 every second time period.

[0016] In an implementation, the controller may also be configured to 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 time period.

[0017] In this implementation, the second reference deviation for each of the plurality of battery cells can be a fixed value.

[0018] The operation method of the battery diagnostic device according to the embodiments disclosed herein includes the following operations: obtaining the voltage of each of a plurality of battery cells; calculating the average value of the voltages of the plurality of battery cells, and calculating the difference between the average value and the voltage of each of the plurality of battery cells as a first deviation; calculating a first change corresponding to the change in the first deviation of each of the plurality of battery cells at each first time period; calculating a second change corresponding to the change in the first deviation of each of the plurality of battery cells at each second time period different from the first time period; and performing anomaly diagnosis on the plurality of battery cells based on the first change and the second change.

[0019] In an implementation, the operation of performing anomaly diagnosis on multiple battery cells based on a first change and a second change may include performing different anomaly diagnosis operations on the multiple battery cells based on each of the first change and the second change.

[0020] In an implementation, the operation of performing anomaly diagnosis on a plurality of battery cells based on a first change and a second change may include the following operations: diagnosing whether an internal short circuit with rapid discharge has occurred in each of the plurality of battery cells based on the first change; and diagnosing whether a minor internal short circuit has occurred in each of the plurality of battery cells based on the second change.

[0021] In the implementation, the second time period can be greater than or equal to the first time period.

[0022] In an implementation method, the operation method may further include storing a first reference deviation of a plurality of battery cells and a second reference deviation of a plurality of battery cells. The operation of calculating a first change corresponding to the change in the first deviation of each of the plurality of battery cells at each first time period includes: calculating 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 at each first time period as a first change. The operation of calculating a second change corresponding to the change in the first deviation of each of the plurality of battery cells at each second time period, which is different from the first time period, includes: calculating 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 at each second time period as a second change.

[0023] In an implementation, the operation 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 every second time period.

[0024] In this implementation, the second reference deviation for each of the plurality of battery cells can be a fixed value.

[0025] Beneficial effects

[0026] The battery diagnostic device and its operating method according to the embodiments disclosed herein can diagnose minute internal short circuits in battery cells with long-term slight self-discharge.

[0027] The battery diagnostic device and its operating method according to the embodiments disclosed herein can simultaneously diagnose short-term internal short circuits and minor internal short circuits in battery cells based on changes in voltage deviations between battery cells.

[0028] In addition, various effects that can be directly or indirectly identified through this document can be provided. Attached Figure Description

[0029] Figure 1 This is a block diagram showing the structure of a typical battery pack.

[0030] Figure 2 A battery diagnostic device according to an embodiment disclosed herein is shown.

[0031] Figure 3 An example of diagnosing multiple battery cells using a battery diagnostic device according to an embodiment disclosed herein is shown.

[0032] Figure 4 This is a flowchart illustrating an operation method of a battery diagnostic device according to an embodiment disclosed herein.

[0033] Figure 5 This is a flowchart illustrating in detail the operation method of a battery diagnostic device according to the embodiments disclosed herein.

[0034] Figure 6 This is a block diagram illustrating the hardware configuration of a computing system for performing an operation method of a battery diagnostic device according to an embodiment disclosed herein. Detailed Implementation

[0035] In the following, the embodiments disclosed herein will be described in detail with reference to exemplary accompanying drawings. When adding reference numerals to the components of each drawing, it should be noted that even if the same component is shown in different drawings, the same component will, as far as possible, have the same reference numerals. Furthermore, in describing the embodiments disclosed herein, detailed descriptions of related known configurations or functions will be omitted if it is determined that such detailed descriptions interfere with the understanding of the embodiments disclosed herein.

[0036] To describe the components of the embodiments disclosed herein, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are used only to distinguish one component from another and do not limit the components in terms of their nature, order, sequence, etc. The terms used herein (including technical and scientific terms) have the same meaning as those commonly understood by those skilled in the art, provided that these terms are not defined differently. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as in the context of the relevant art and should not be interpreted as having an ideal or exaggerated meaning unless they are clearly defined in this application.

[0037] Figure 1 This is a block diagram showing the structure of a typical battery pack.

[0038] Reference Figure 1 The illustration schematically shows a battery control system according to an embodiment of the present disclosure, which includes a battery pack 1 and a host controller 2 included in a host system.

[0039] like Figure 1 As shown, the battery pack 1 may include: a plurality of battery cells 10, the plurality of battery cells including one or more battery cells and being rechargeable / dischargeable; a switching unit 14, which is connected in series to the positive (+) terminal side or the negative (-) terminal side of the plurality of battery cells 10 to control the flow of charging / discharging current of the plurality of battery cells 10; and a battery management system 20, which is used to control and manage to prevent overcharging and over-discharging by monitoring the voltage, current, temperature, etc. of the battery pack 1. The battery pack 1 may include a plurality of battery cells 10, a sensor 12, a switching unit 14, and a plurality of battery management systems 20.

[0040] In this document, the switching unit 14, which is used as an element for controlling the current flow of charging or discharging of multiple battery cells 10, may, for example, use at least one relay, magnetic contactor, etc., depending on the specifications of the battery pack 1.

[0041] The battery management system 20, serving as an interface for receiving measured values ​​of the aforementioned parameters, may include multiple terminals and circuitry connected to the terminals to process input values. The battery management system 20 can control the on / off switching of the switching unit 14 (e.g., a relay, contactor, etc.) and can be connected to multiple battery cells 10 to monitor the state of each battery cell 10. According to an embodiment, the battery management system 20 may include... Figure 2 The battery diagnostic device 100. According to another embodiment, the battery management system 20 may be different from... Figure 2 Battery diagnostic equipment 100. That is to say, Figure 2The battery diagnostic device 100 can be included in the battery pack 1 and can be configured as another device outside the battery pack 1. The following operations of the battery diagnostic device 100 can also be performed in various devices such as not only the battery management system (BMS) in a vehicle, but also servers, cloud, chargers, chargers / dischargers, etc.

[0042] The upper-level controller 2 can send control signals regarding the multiple battery cells 10 to the battery management system 20. Therefore, the battery management system 20 can be controlled in its operation based on the signals applied from the upper-level controller 2.

[0043] Figure 2 A battery diagnostic device according to an embodiment disclosed herein is shown.

[0044] The battery diagnostic device 100 can be one of various electronic devices used for managing, diagnosing, or testing batteries. For example, the battery diagnostic device 100 can be included in the BMS in a vehicle, or it can be implemented as a separate external device different from the BMS in the vehicle.

[0045] According to another embodiment, the battery diagnostic device 100 may be included in a device for charging / discharging testing, such as a server, cloud server, or charge / discharge cycler, or may be included in various devices for diagnosing or testing batteries.

[0046] Reference Figure 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 also include a storage unit 140.

[0047] 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 preset intervals. In another example, the information acquisition unit 110 can acquire the open-circuit voltage of each of the plurality of battery cells.

[0048] According to the embodiment, the information acquisition unit 110 can acquire the open-circuit voltage of each of the plurality of battery cells at a first time interval and at a second time interval. For example, the first time interval can be one day and the second time interval can be 30 days, but this disclosure is not limited thereto.

[0049] According to the implementation method, the second time period can be an integer multiple of the first time period.

[0050] The voltage deviation calculation unit 120 can calculate the average voltage of multiple battery cells. For example, the voltage deviation calculation unit 120 can calculate the average voltage of multiple battery cells at a preset time point.

[0051] The voltage deviation calculation unit 120 can calculate the difference between the calculated average value and the voltage of each of the plurality of battery cells as a first deviation. For example, the voltage deviation calculation unit 120 can calculate the first deviation for each of the plurality of battery cells.

[0052] According to the embodiment, the voltage deviation calculation unit 120 can receive the voltage of each of the plurality of battery cells at a preset time, calculate a first deviation of each of the plurality of battery cells, and correspond the first deviation to the preset time. The voltage deviation calculation unit 120 can send the first deviation of each of the plurality of battery cells corresponding to the preset time to the controller 130.

[0053] According to one embodiment, the voltage deviation calculation unit 120 may be included in the controller 130. According to another embodiment, the operation of the voltage deviation calculation unit 120 may be performed by the controller 130.

[0054] The controller 130 can calculate a first change corresponding to the change in a first deviation of each of the plurality of battery cells at first time intervals. The controller 130 can also calculate a second change corresponding to the change in the first deviation of each of the plurality of battery cells at second time intervals different from the first time interval. For example, the first time interval can be one day and the second time interval can be 30 days, but this disclosure is not limited thereto. According to embodiments, the second time interval can be greater than or equal to the first time interval.

[0055] The controller 130 can diagnose anomalies in multiple battery cells based on a first change and a second change. For example, the controller 130 can perform different anomaly diagnoses on the multiple battery cells based on the first change and the second change. That is, the controller 130 can perform a first anomaly diagnosis on the multiple battery cells based on the first change and a second anomaly diagnosis on the multiple battery cells based on the second change.

[0056] According to an implementation, the controller 130 can diagnose whether an internal short circuit with rapid discharge has occurred in each of the plurality of battery cells based on a first change. The controller 130 can also diagnose whether a minor internal short circuit has occurred in each of the plurality of battery cells based on a second change. That is, the controller 130 can diagnose a rapid internal short circuit based on a first change in a first deviation over a first time period, and diagnose a minor internal short circuit based on a second change in a first deviation over a second time period that is longer than the first time period.

[0057] The storage unit 140 can store a first reference deviation and a second reference deviation of multiple battery cells. For example, the first reference deviation can be a value used to calculate a first change, and the second reference deviation can be a value used to calculate a second change. For example, the second reference deviation can be a fixed value. According to an embodiment, the second reference deviation can be a value set during battery production and remains fixed until the battery is discarded.

[0058] According to the implementation method, the first reference deviation can be set as a first deviation of each of the plurality of battery cells at a specific point in time. For example, the first reference deviation can be set as a first deviation of each of the plurality of battery cells at a first diagnostic point in time.

[0059] According to the implementation method, the first reference deviation can be updated to the first deviation of each of the multiple battery cells at a corresponding time point every preset time period. For example, the first reference deviation can be updated to the first deviation of the multiple battery cells at a corresponding time point every second time period.

[0060] The controller 130 can calculate a first change as the difference between a first reference deviation of the plurality of battery cells and a first deviation of each of the plurality of battery cells every first time period. The controller 130 can also calculate a second change as the difference between a second reference deviation of the plurality of battery cells and a first deviation of each of the plurality of battery cells every second time period.

[0061] According to an implementation, the controller 130 can diagnose an internal short circuit in a battery cell among a plurality of battery cells where the first change is at least a first threshold.

[0062] According to an implementation, the controller 130 can diagnose a minor internal short circuit in a battery cell among a plurality of battery cells where the second variation is at least a second threshold.

[0063] The battery diagnostic device 100 according to the embodiments disclosed herein can diagnose minute internal short circuits in battery cells that experience prolonged slight self-discharge.

[0064] The battery diagnostic device 100 according to the embodiments disclosed herein can simultaneously diagnose short-term internal short circuits and minor internal short circuits in battery cells based on changes in voltage deviations between battery cells.

[0065] Figure 3 An example of diagnosing multiple battery cells using a battery diagnostic device according to an embodiment disclosed herein is shown.

[0066] Reference Figure 3 The information acquisition unit 110 of the battery diagnostic device 100 can acquire the voltages (OCVf, OCVs, etc.) of multiple battery cells.

[0067] The voltage deviation calculation unit 120 can calculate the average value of the voltage OCVm of multiple battery cells, and calculate the difference between the average value and the voltage OCVs or OCVm of each of the multiple battery cells as the first deviation (dVs, dVm).

[0068] The voltage OCVf of each of the initially obtained multiple battery cells can be stored in storage unit 140. Storage unit 140 can store a second reference deviation of each of the multiple battery cells calculated based on the voltage OCVf of each of the initially obtained multiple battery cells. For example, the second reference deviation can be calculated as the difference between the average voltage OCVf of each of the initially obtained multiple battery cells and the voltage OCVf of each of the initially obtained multiple battery cells.

[0069] Storage unit 140 can store a first reference deviation dVs. For example, the first reference deviation dVs can be updated every preset time period. In another example, the first reference deviation dVs can be calculated based on the voltage OCVs of each of the plurality of battery cells at a preset time point. For example, the first reference deviation dVs can be calculated as the difference between the average value of the voltage OCVs of each of the plurality of battery cells at the preset time point and the voltage OCVs of each of the plurality of battery cells at the preset time point. According to an embodiment, the first reference deviation dVs can be updated every second time period.

[0070] The controller 130 can calculate a first change corresponding to the change in the first deviation of the plurality of battery cells at each first time interval. For example, the controller 130 can calculate the first change as the difference between the first deviation dVm of the plurality of battery cells and the first reference deviation dVs at each first time interval.

[0071] The controller 130 can diagnose each of the plurality of battery cells based on a first change. For example, the controller 130 can diagnose an internal short circuit in a battery cell where the first change is at least a first threshold (e.g., 10 mV).

[0072] The controller 130 can calculate a second change corresponding to a first deviation of the plurality of battery cells at every second time interval. For example, the controller 130 can calculate the second change based on the difference between the first deviation dVs of the plurality of battery cells and a second reference deviation dVf at every second time interval.

[0073] The controller 130 can diagnose each of the multiple battery cells based on the second change. For example, the controller 130 can diagnose a minor internal short circuit in a battery cell where the second change is at least a second threshold (e.g., 10 mV).

[0074] Figure 4 This is a flowchart illustrating an operation method of a battery diagnostic device according to an embodiment disclosed herein. According to the embodiment, Figure 4 The operation shown can be performed by Figure 2 The battery diagnostic equipment 100 is used for this purpose.

[0075] Reference Figure 4 In operation 410, the information acquisition unit 110 can acquire the voltages of multiple battery cells. For example, the information acquisition unit 110 can acquire the voltage of each of the multiple battery cells at preset intervals. In another example, the information acquisition unit 110 can acquire the open-circuit voltage of each of the multiple battery cells.

[0076] According to the embodiment, the information acquisition unit 110 can acquire the open-circuit voltage of each of the plurality of battery cells at a first time interval and at a second time interval. For example, the first time interval can be one day and the second time interval can be 30 days, but this disclosure is not limited thereto.

[0077] In operation 420, the voltage deviation calculation unit 120 can calculate the average voltage of multiple battery cells. For example, the voltage deviation calculation unit 120 can calculate the average voltage of multiple battery cells at a preset time point.

[0078] The voltage deviation calculation unit 120 can calculate the difference between the calculated average value and the voltage of each of the plurality of battery cells as a first deviation. For example, the voltage deviation calculation unit 120 can calculate the first deviation for each of the plurality of battery cells.

[0079] In operation 430, controller 130 can calculate a first change corresponding to the change in a first deviation of each of the plurality of battery cells at each first time interval.

[0080] In operation 440, the controller 130 may also calculate a second change corresponding to the change in the first deviation of each of the plurality of battery cells at intervals of a second time period different from the first time period. For example, the first time period may be one day and the second time period may be 30 days, but this disclosure is not limited thereto. According to an embodiment, the second time period may be greater than or equal to the first time period.

[0081] In operation 450, storage unit 140 can store a first reference deviation and a second reference deviation of multiple battery cells. For example, the first and second reference deviations of the multiple battery cells can be values ​​stored in storage unit 140, and can be calculated and stored by controller 130. According to an embodiment, operation 450 can be omitted. In another example, the first reference deviation can be a value used to calculate a first change, and the second reference deviation can be a value used to calculate a second change. For example, the second reference deviation can be a fixed value. According to an embodiment, the second reference deviation can be a value set during battery production and remains fixed until the battery is discarded.

[0082] According to the implementation method, the first reference deviation can be set as a first deviation of each of the plurality of battery cells at a specific point in time. For example, the first reference deviation can be set as a first deviation of each of the plurality of battery cells at a first diagnostic point in time.

[0083] According to the implementation method, the first reference deviation can be updated to the first deviation of each of the multiple battery cells at a corresponding time point every preset time period. For example, the first reference deviation can be updated to the first deviation of the multiple battery cells at a corresponding time point every second time period.

[0084] In operation 460, controller 130 can diagnose anomalies in multiple battery cells based on a first change and a second change. For example, controller 130 can perform different anomaly diagnoses on multiple battery cells based on the first change and the second change. That is, controller 130 can perform a first anomaly diagnosis on multiple battery cells based on the first change and a second anomaly diagnosis on multiple battery cells based on the second change.

[0085] According to an implementation, the controller 130 can diagnose whether an internal short circuit with rapid discharge has occurred in each of the plurality of battery cells based on a first change. The controller 130 can also diagnose whether a minor internal short circuit has occurred in each of the plurality of battery cells based on a second change. That is, the controller 130 can diagnose a rapid internal short circuit based on a first change in a first deviation over a first time period, and diagnose a minor internal short circuit based on a second change in a first deviation over a second time period that is longer than the first time period.

[0086] According to an embodiment, the controller 130 can calculate a first change as the difference between a first reference deviation of the plurality of battery cells and a first deviation of each of the plurality of battery cells every first time period. The controller 130 can also calculate a second change as the difference between a second reference deviation of the plurality of battery cells and a first deviation of each of the plurality of battery cells every second time period.

[0087] Figure 5 This is a flowchart illustrating in detail the operation method of a battery diagnostic device according to embodiments disclosed herein. According to the embodiments, Figure 5 The operation shown can be performed by Figure 2 The battery diagnostic equipment 100 is used for this purpose.

[0088] Reference Figure 5 In operation 510, controller 130 can diagnose whether an internal short circuit with rapid discharge has occurred in each of the plurality of battery cells based on a first change. For example, controller 130 can diagnose an internal short circuit in a battery cell in the plurality of battery cells where the first change is at least a first threshold.

[0089] In operation 520, controller 130 can also diagnose whether a minor internal short circuit has occurred in each of the plurality of battery cells based on the second change amount. For example, controller 130 can diagnose that a minor internal short circuit has occurred in a battery cell among the plurality of battery cells where the second change amount is at least a second threshold.

[0090] In operation 530, controller 130 can update the first reference deviation of the multiple battery cells every second time period using the first deviation of each of the multiple battery cells.

[0091] Figure 6 This is a block diagram illustrating the hardware configuration of a computing system for performing an operation method of a battery diagnostic device according to an embodiment disclosed herein.

[0092] Reference Figure 6 The computing system 1000 according to the embodiments disclosed herein may include a microcontroller unit (MCU) 1010, a memory 1020, an input / output interface (I / F) 1030, and a communication I / F 1040.

[0093] The MCU 1010 can be a processor that executes various programs stored in the memory 1020 (e.g., multiple battery cell voltage measurement programs, multiple battery cell voltage deviation calculation programs, multiple battery cell diagnostic programs, etc.). These programs process various information, including the voltage of multiple battery cells, the voltage deviation of multiple battery cells, and internal short circuits of multiple battery cells, and enable... Figure 2 The functions of the controller included in the battery diagnostic device shown are executed.

[0094] The memory 1020 can store various programs such as multiple battery cell voltage measurement programs, multiple battery cell voltage deviation calculation programs, and multiple battery cell diagnostic programs. The memory 1020 can also store various information including the voltage of multiple battery cells, the voltage deviation of multiple battery cells, and internal short circuits of multiple battery cells.

[0095] Multiple memory modules 1020 can be configured as needed. Memory modules 1020 can be volatile or non-volatile. For memory modules 1020 used as volatile memory, random access memory (RAM), dynamic RAM (DRAM), static RAM (SRAM), etc., can be used. For memory modules 1020 used as non-volatile memory, read-only memory (ROM), programmable ROM (PROM), electrically rewritable ROM (EAROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), flash memory, etc., can be used. The examples of memory modules 1020 listed above are merely examples and are not limited to these.

[0096] The Input / Output I / F 1030 provides an interface for sending and receiving data by connecting input devices (not shown) such as a keyboard, mouse, touch panel, etc., and output devices such as a display (not shown) to the MCU 1010.

[0097] The communication I / F 1040, which serves as a component capable of sending and receiving various types of data from a server, can be any type of device capable of supporting wired or wireless communication. For example, a battery diagnostic device can use the communication I / F 1040 to send and receive various information from a separately provided external server, including information such as the voltage of multiple battery cells, voltage deviations of multiple battery cells, and internal short circuits of multiple battery cells.

[0098] Thus, the computer program according to the embodiments disclosed herein can be recorded in memory 220 and processed by MCU 210, thereby being implemented to execute... Figure 2 The module that provides the shown functions.

[0099] The above description is merely an illustration of the technical concepts disclosed herein, and various modifications and variations may be made by those skilled in the art to which the embodiments disclosed herein pertain without departing from the basic characteristics of the embodiments disclosed herein.

[0100] Therefore, the embodiments disclosed herein are intended to describe, and not limit, the technical spirit of the embodiments disclosed herein, and the scope of the technical spirit disclosed herein is not limited by these embodiments. The scope of protection of the technical spirit disclosed herein should be interpreted by the appended claims, and all technical spirit within the same scope should be understood to be included within the scope of this document.

[0101] [Figure Labels]

[0102] 100: Battery diagnostic equipment

[0103] 110: Information Acquisition Unit

[0104] 120: Voltage Deviation Calculation Unit

[0105] 130: Controller

[0106] 120: Storage unit

[0107] 1000: Computing System

[0108] 1010: MCU

[0109] 1020: Memory

[0110] 1030: Input / Output I / F

[0111] 1040: Communication I / F

Claims

1. A battery diagnostic device, the battery diagnostic device comprising: An information acquisition unit is configured to acquire the voltage of each of a plurality of battery cells; A voltage deviation calculation unit is configured to calculate the average voltage of the plurality of battery cells, and to calculate the difference between the average voltage and the voltage of each of the plurality of battery cells as a first deviation; as well as The controller is configured to: Every first time period, calculate a first change corresponding to the change in the first deviation of each of the plurality of battery cells; Every second time period different from the first time period, a second change corresponding to the change in the first deviation of each of the plurality of battery cells is calculated; and Anomaly diagnosis is performed on the plurality of battery cells based on the first change and the second change.

2. The battery diagnostic device according to claim 1, wherein, The controller is also configured to perform different anomaly diagnoses on the plurality of battery cells based on each of the first change and the second change.

3. The battery diagnostic device according to claim 2, wherein, The controller is also configured to: Based on the first change, a diagnosis is made as to whether an internal short circuit with rapid discharge has occurred in each of the plurality of battery cells; and The second change is used to diagnose whether a minor internal short circuit has occurred in each of the plurality of battery cells.

4. The battery diagnostic device according to claim 1, wherein, The second time period is greater than or equal to the first time period.

5. The battery diagnostic device according to claim 1, further comprising a storage unit configured to store a first reference deviation of the plurality of battery cells and a second reference deviation of the plurality of battery cells. in, The controller is also configured to: 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 every first time period is calculated as the first change amount; and 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 every second time period is calculated as the second change.

6. The battery diagnostic device according to claim 5, wherein, The controller is also configured to update the first reference deviation of the plurality of battery cells every second time period using the first deviation of each of the plurality of battery cells.

7. The battery diagnostic device according to claim 5, wherein, The second reference deviation for each of the plurality of battery cells is a fixed value.

8. A method for operating a battery diagnostic device, the method comprising the following operations: Obtain the voltage of each of the multiple battery cells; Calculate the average voltage of the plurality of battery cells, and calculate the difference between the average voltage and the voltage of each of the plurality of battery cells as a first deviation; Every first time period, calculate a first change corresponding to the change in the first deviation of each of the plurality of battery cells; Every second time period different from the first time period, a second change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells is calculated; as well as Anomaly diagnosis is performed on the plurality of battery cells based on the first change and the second change.

9. The operating method according to claim 9, wherein, The operation of performing the anomaly diagnosis on the plurality of battery cells based on the first change and the second change includes performing different anomaly diagnoses on the plurality of battery cells based on each of the first change and the second change.

10. The operating method according to claim 10, wherein, The operation of performing the anomaly diagnosis on the plurality of battery cells based on the first change and the second change includes the following operations: Based on the first change, a diagnosis is made as to whether an internal short circuit with rapid discharge has occurred in each of the plurality of battery cells. as well as The second change is used to diagnose whether a minor internal short circuit has occurred in each of the plurality of battery cells.

11. The operating method according to claim 9, wherein, The second time period is greater than or equal to the first time period.

12. The operating method according to claim 9, further comprising storing a first reference deviation of the plurality of battery cells and a second reference deviation of the plurality of battery cells. in, The operation of calculating the first change corresponding to the change in the first deviation of each of the plurality of battery cells at every first time period includes: calculating 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 at every first time period as the first change, and The operation of calculating the second change amount corresponding to the change amount of the first deviation of each of the plurality of battery cells at every second time period different from the first time period includes: calculating 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 at every second time period as the second change amount.

13. The operating method according to claim 12, further comprising updating the first reference deviation of the plurality of battery cells with the first deviation of each of the plurality of battery cells every second time period.

14. The operating method according to claim 12, wherein, The second reference deviation for each of the plurality of battery cells is a fixed value.

Images