Battery diagnosis device and operating method thereof

Abstract

A battery diagnosis device according to an embodiment disclosed in the present document includes: an acquisition unit for acquiring state data indicating the state of charge (SOC) and the voltage standard score (z-score) of a battery; an estimation unit for estimating a first SOC interval, in which balancing of the battery occurs, and a second SOC interval, in which balancing does not occur, on the basis of the state data; an extraction unit for extracting a first voltage standard score corresponding to the first SOC interval and a second voltage standard score corresponding to the second SOC interval on the basis of the state data; and a diagnosis unit for diagnosing an abnormality of the battery on the basis of the first voltage standard score and the second voltage standard score.

Description

Battery diagnostic device and its operating method

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Republic of Korea Patent Application No. 10-2023-0189924, filed December 22, 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] Research and development on secondary batteries has been actively conducted recently. The term "secondary battery" refers to a rechargeable battery, encompassing both conventional Ni / Cd and Ni / MH batteries, as well as more recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries boast a significantly 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 ideal power sources for mobile devices. Recently, their use has expanded to include power sources for electric vehicles, drawing attention as a next-generation energy storage medium.

[0006] Additionally, secondary batteries can be utilized as battery packs, which typically include battery modules in which multiple battery cells are connected in series and / or parallel. Furthermore, secondary batteries can be utilized as battery racks, which include multiple battery modules and a rack frame that accommodates these battery modules.

[0007] Battery cells, battery modules, battery packs, or battery racks like these can be utilized in a variety of devices. For example, batteries can be used in mobile devices such as cell phones, laptops, smartphones, and tablets, as well as in electric vehicles (EVs, HEVs, PHEVs) and large-capacity energy storage systems (ESS).

[0008] These batteries can have their status and operation managed and controlled by a battery management system (BMS). The BMS can be included with the batteries in a single device.

[0009] Additionally, the battery management system can manage and control the battery while being separated from the device containing the battery. For example, the battery management system can be implemented as a separate server device. In this case, the battery management system can collect battery data and vehicle data from vehicles and other devices, and utilize the collected data to manage and control the battery.

[0010] Meanwhile, if a battery is defective, the risk of damage to devices containing the battery (e.g., EVs, ESS) may increase. Therefore, a method is needed to detect abnormal battery conditions and reduce the risk of damage to devices containing the battery.

[0011] Embodiments disclosed in this document can provide a battery diagnosis device and an operating method thereof capable of estimating a state of charge (SOC) balancing section of a battery based on battery status data and diagnosing an abnormality of the battery based on a voltage standard score in the estimated balancing section.

[0012] 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.

[0013] A battery diagnosis device according to an embodiment disclosed in the present document may include an acquisition unit that acquires state data indicating a state of charge (SOC) and a voltage standard score (Z-Score) of a battery, an estimation unit that estimates a first SOC section in which balancing of the battery occurs and a second SOC section in which balancing does not occur based on the state data, an extraction unit that extracts a first voltage standard score corresponding to the first SOC section and a second voltage standard score corresponding to the second SOC section based on the state data, and a diagnosis unit that diagnoses an abnormality of the battery based on the first voltage standard score and the second voltage standard score.

[0014] In a battery diagnostic device according to an embodiment disclosed in this document, the status data may represent a voltage standard score according to the SOC of the battery.

[0015] In a battery diagnostic device according to an embodiment disclosed in this document, the estimation unit can estimate the first SOC section and the second SOC section based on the amount of change in a voltage standard score according to the SOC of the battery.

[0016] In a battery diagnostic device according to an embodiment disclosed in this document, the first SOC section may include an SOC section in which the change amount in the state data is greater than or equal to a specified value, and in the second SOC section, the change amount may be less than the specified value.

[0017] In a battery diagnostic device according to an embodiment disclosed in this document, the extraction unit can extract the maximum voltage standard score of the first SOC section as the first voltage standard score, and can extract the minimum voltage standard score of the second SOC section as the second voltage standard score.

[0018] In a battery diagnostic device according to an embodiment disclosed in this document, the diagnostic unit can diagnose an abnormality of the battery based on a difference value between the first voltage standard score and the second voltage standard score.

[0019] In a battery diagnostic device according to an embodiment disclosed in this document, the diagnostic unit can diagnose an abnormality in the battery by comparing the difference value with a preset threshold value.

[0020] A battery diagnostic device according to an embodiment disclosed in this document further includes an abnormality processing unit that performs an abnormality processing function based on an abnormality diagnosis result of the battery, and the abnormality processing function may include a notification function or a short circuit function.

[0021] An operating method of a battery diagnosis device according to an embodiment disclosed in the present document may include an operation of acquiring state data indicating a state of charge (SOC) and a voltage standard score (Z-Score) of a battery, an operation of estimating a first SOC section in which balancing of the battery occurs and a second SOC section in which balancing does not occur based on the state data, an operation of extracting a first voltage standard score corresponding to the first SOC section and a second voltage standard score corresponding to the second SOC section based on the state data, and an operation of diagnosing an abnormality of the battery based on the first voltage standard score and the second voltage standard score.

[0022] In the operating method of the battery diagnostic device according to one embodiment disclosed in this document, the status data may represent a voltage standard score according to the SOC of the battery.

[0023] In the operating method of the battery diagnosis device according to one embodiment disclosed in this document, the operation of estimating the first SOC section and the second SOC section may include an operation of estimating the first SOC section and the second SOC section based on the amount of change in the voltage standard score according to the SOC of the battery.

[0024] In the operating method of the battery diagnosis device according to one embodiment disclosed in this document, the first SOC section may include an SOC section in which the change amount in the state data is greater than or equal to a specified value, and in the second SOC section, the change amount may be less than the specified value.

[0025] In the operating method of the battery diagnosis device according to one embodiment disclosed in this document, the operation of extracting the first voltage standard score and the second voltage standard score may include the operation of extracting the maximum voltage standard score of the first SOC section as the first voltage standard score, and the operation of extracting the minimum voltage standard score of the second SOC section as the second voltage standard score.

[0026] In the operating method of the battery diagnosis device according to one embodiment disclosed in this document, the operation of diagnosing an abnormality of the battery may include an operation of diagnosing an abnormality of the battery based on a difference value between the first voltage standard score and the second voltage standard score.

[0027] In the operating method of the battery diagnosis device according to one embodiment disclosed in this document, the operation of diagnosing an abnormality in the battery may include an operation of diagnosing an abnormality in the battery by comparing the difference value with a preset threshold value.

[0028] According to the embodiments disclosed in this document, even if there is no information about battery balancing (e.g., balancing current and operating time, etc.), the balancing section can be estimated using voltage information of the battery.

[0029] Additionally, according to the embodiments disclosed in this document, it is possible to improve the diagnostic accuracy by diagnosing battery abnormalities using the battery voltage standard score in the estimated balancing section.

[0030] In addition, various effects may be provided, either directly or indirectly, through this document.

[0031] FIG. 1 is a block diagram of a battery diagnostic device according to one embodiment.

[0032] FIG. 2 is a graph showing battery status data acquired by a battery diagnostic device according to one embodiment.

[0033] Figure 3 is a flowchart of the operation of a battery diagnostic device according to one embodiment.

[0034] Figure 4 is a flowchart illustrating the operation of a battery diagnostic device according to one embodiment.

[0035] Hereinafter, various embodiments of the present invention will be described with reference to the attached drawings. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that the present invention encompasses various modifications, equivalents, and / or alternatives of the embodiments.

[0036] The various embodiments and terminology used in this document are not intended to limit the technical features described in this document to specific embodiments, but should be understood to encompass various modifications, equivalents, or alternatives of the embodiments. 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 items, unless the context clearly indicates otherwise.

[0037] 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 element from other corresponding elements, and do not limit the corresponding elements in any other respect (e.g., importance or order) unless specifically stated otherwise.

[0038] In this document, whenever 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), wirelessly, or via a third component.

[0039] According to various embodiments, 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 various embodiments, 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 such a 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 various embodiments, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

[0040] FIG. 1 is a block diagram of a battery diagnostic device according to one embodiment.

[0041] The battery diagnostic device (101) described below can be implemented as a BMS (Battery Management System) in an electronic device (102), but can also be implemented as various external devices such as a server, cloud, charger, or charger / discharger.

[0042] Referring to FIG. 1, a battery diagnostic device (101) can be connected to an electronic device (102) and a user terminal (104) via wires and / or wirelessly.

[0043] According to one embodiment, the connection (103) between the battery diagnostic device (101) and the electronic device (102) may be a communication connection via a wired and / or wireless network. In one embodiment, the wired network may be based on a local area network (LAN) communication or a power line communication. In one embodiment, the wireless network may be based on a short-range communication network (e.g., Bluetooth, wireless fidelity (WiFi), or infrared data association (IrDA)) or a wide-range communication network (cellular network, 4G network, 5G network).

[0044] According to another embodiment, the connection (103) between the battery diagnostic device (101) and the electronic device (102) may be a connection via a device-to-device communication method (e.g., a bus, a general purpose input and output (GPIO), a serial peripheral interface (SPI), or a mobile industry processor interface (MIPI)).

[0045] According to one embodiment, the electronic device (102) may be a mobile device (e.g., a mobile phone, a laptop computer, a smart phone, a smart pad), an electric vehicle (e.g., an electric vehicle (EV), a hybrid EV (HEV), a plug-in HEV (PHEV), a fuel cell EV (FCEV)), an energy storage system (ESS), or a battery swapping system (BSS).

[0046] According to one embodiment, the electronic device (102) may include a plurality of batteries (151, 153, 155). According to one embodiment, the plurality of batteries (151, 153, 155) may include at least one of a battery cell, a battery module, a battery pack, or a battery rack.

[0047] According to one embodiment, the connection (105) between the battery diagnostic device (101) and the user terminal (104) may be a communication connection via a wired and / or wireless network.

[0048] According to one embodiment, the user terminal (104) may be a mobile device (e.g., a mobile phone, a laptop computer, a smart phone, a smart pad), or a personal computer (PC). According to one embodiment, the battery diagnostic device (101) may provide information related to the diagnostic results of the battery unit (151, 153, or 155) to the user terminal (104).

[0049] According to one embodiment, the battery diagnosis device (101) may include a communication circuit (110), a sensor (120), a memory (130), and a processor (140). Depending on the embodiment, the battery diagnosis device (101) illustrated in FIG. 1 may further include at least one component (e.g., a display, an input device, or an output device) other than the components illustrated in FIG. 1, or may omit at least one component (e.g., a sensor (120)) among the components illustrated in FIG. 1. For example, when the battery diagnosis device (101) is implemented as an external electronic device separate from the electronic device (102), such as a server or a cloud, the battery diagnosis device (101) may obtain status information of a plurality of batteries (151, 153, 155) using the communication circuit (110). In this case, the battery diagnosis device (101) may not include the sensor (120).

[0050] According to one embodiment, the communication circuit (110) can establish a wired communication channel and / or a wireless communication channel between the battery diagnostic device (101) and the electronic device (102) and / or the user terminal (104), and transmit and receive data with the electronic device (102) and / or the user terminal (104) through the established communication channel.

[0051] According to one embodiment, the sensor (120) can measure information (e.g., voltage, current, temperature, etc.) related to the status of multiple batteries (151, 153, 155) of the electronic device (102). For example, when the battery diagnosis device (101) is implemented as a BMS within the electronic device, the battery diagnosis device (101) can directly measure the status values ​​of the multiple batteries (151, 153, 155) using the sensor (120).

[0052] According to one embodiment, the communication circuit (110) and / or the sensor (120) may obtain time series data related to the states of the plurality of batteries (151, 153, 155). In one embodiment, the time series data related to the states of the plurality of batteries (151, 153, 155) may be data representing voltage, current, resistance, state of charge (SOC), state of health (SOH), and / or temperature of the plurality of batteries (151, 153, 155) over time.

[0053] According to one embodiment, the memory (130) may include volatile memory and / or non-volatile memory.

[0054] According to one embodiment, the memory (130) may store data used by at least one component (e.g., processor (140)) of the battery diagnosis device (101). For example, the data may include software (or instructions related thereto), input data, or output data. In one embodiment, the instructions, when executed by the processor (140), may cause the battery abnormality diagnosis device (101) to perform operations defined by the instructions.

[0055] According to one embodiment, the memory (130) may include one or more software (e.g., an acquisition unit (131), an estimation unit (132), an extraction unit (133), a diagnosis unit (134), and an anomaly processing unit (135)).

[0056] According to one embodiment, the processor (140) may include a central processing unit, an application processor, a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor.

[0057] According to one embodiment, the processor (140) may execute software (e.g., acquisition unit (131), estimation unit (132), extraction unit (133), diagnosis unit (134), and abnormality processing unit (135)) stored in the memory (130) to control at least one other component (e.g., hardware or software component) of the battery diagnosis device (101) connected to the processor (140) and perform various data processing or calculations.

[0058] Hereinafter, with reference to FIG. 2, a method for diagnosing anomalies in a plurality of batteries (151, 153, 155) through a battery diagnostic device (101) acquisition unit (131), an estimation unit (132), an extraction unit (133), a diagnosis unit (134), and anomaly processing unit (135) is described.

[0059] FIG. 2 is a graph showing battery status data acquired by a battery diagnostic device according to one embodiment.

[0060] According to one embodiment, the acquisition unit (131) may acquire status data indicating the SOC and voltage standard score (Z-Score) of the battery (151, 153, or 155). Here, the status data may indicate the voltage standard score according to the SOC of the battery (151, 153, or 155). In other words, the voltage standard score at a specific SOC of the battery (151, 153, or 155) may be known through the status data.

[0061] According to one embodiment, the acquisition unit (131) can acquire the status data generated by an external electronic device using the communication circuit (110).

[0062] According to one embodiment, the acquisition unit (131) can acquire the status data based on the status value of the battery collected using the communication circuit (110) and / or the sensor (120).

[0063] According to one embodiment, the acquisition unit (131) may collect signals related to the status of a plurality of batteries (151, 153, 155) using the communication circuit (110) and / or the sensor (120) for each unit time and record the status values ​​(e.g., voltage value, current value, temperature value, resistance value, SOC, etc.) of the plurality of batteries (151, 153, 155) in the memory (130). Here, the unit time may be an integer multiple of the status signal reception cycle of the communication circuit (110) or the status measurement cycle of the sensor (120).

[0064] According to one embodiment, the acquisition unit (131) may generate status data indicating a voltage standard score according to the SOC of the battery (151, 153, or 155) based on the status values ​​of the plurality of batteries (151, 153, 155) recorded in the memory (130). For example, the acquisition unit (131) may generate the status data after calculating the voltage standard score of the battery (151, 153, or 155) based on the voltage values ​​of the plurality of batteries (151, 153, 155). At this time, the number of status data may increase by 1 each time the status values ​​of the plurality of battery cells (151, 153, 155) are acquired.

[0065] Referring to FIG. 2, a graph (200) can be seen as an example showing status data indicating voltage standard scores according to SOC of a plurality of batteries (e.g., 151, 153, 155) acquired by the acquisition unit (131). In the graph (200), the horizontal axis can represent SOC (%), and the vertical axis can represent voltage standard scores.

[0066] According to one embodiment, the estimation unit (132) can estimate a first SOC section in which balancing of the battery (151, 153, or 155) occurs and a second SOC section in which balancing does not occur based on the state data. Here, the balancing may mean balancing performed by the battery (151, 153, and / or 155) itself to uniformly adjust the voltage or SOC between the plurality of batteries (151, 153, 155) or balancing performed by the electronic device (102) on the battery (151, 153, and / or 155).

[0067] According to one embodiment, the estimation unit (132) can estimate a first SOC section and a second SOC section based on the amount of change in the voltage standard score according to the SOC of the battery (151, 153, or 155). Here, the first SOC section includes an SOC section in which the amount of change is greater than or equal to a value specified in the status data, and in the second SOC section, the amount of change may be less than the specified value.

[0068] Referring to the graph (200), the estimation unit (132) can estimate a first section (R1) including an SOC section in which the change in voltage standard score according to SOC change is greater than or equal to a specified value (e.g., 3) as the first SOC section. In addition, the estimation unit (132) can estimate a second section (R2) in which the change in voltage standard score according to SOC change is less than a specified value as the second SOC section.

[0069] According to one embodiment, the extraction unit (133) may extract a first voltage standard score and a second voltage standard score of the battery (151, 153, or 155) based on the state data. Here, the first voltage standard score may correspond to a first SOC section estimated by the estimation unit (132), and the second voltage standard score may correspond to a second SOC section estimated by the estimation unit (132). Specifically, the first voltage standard score may be a representative voltage standard score of the first SOC section, and the second voltage standard score may be a representative voltage standard score of the second SOC section.

[0070] According to one embodiment, the extraction unit (133) may extract the maximum voltage standard score of the battery (151, 153, or 155) in the first SOC section as the first voltage standard score. In addition, the extraction unit (133) may extract the minimum voltage standard score of the battery (151, 153, or 155) in the second SOC section as the second voltage standard score. For example, referring to the graph (200), the extraction unit (133) may extract the maximum voltage standard score of the first section (R1) as the first voltage standard score, and the minimum voltage standard score of the second section (R2) as the second voltage standard score.

[0071] According to one embodiment, the diagnostic unit (134) can diagnose an abnormality of the battery (151, 153, or 155) based on the first voltage standard score and the second voltage standard score extracted by the extraction unit (133). According to another embodiment, when a plurality of batteries (151, 153, 155) are battery cells included in one battery pack, the diagnostic unit (134) can also diagnose an abnormality of the battery pack including the plurality of batteries (151, 153, 155) based on the first voltage standard score and the second voltage standard score.

[0072] According to one embodiment, the diagnostic unit (134) can calculate a difference value between the first voltage standard score and the second voltage standard score. Based on the calculated difference value, the diagnostic unit (134) can diagnose an abnormality of the battery (151, 153, or 155) or the battery pack. Here, the difference value can be a value obtained by subtracting a smaller value from a larger value between the first voltage standard score and the second voltage standard score.

[0073] According to one embodiment, the diagnostic unit (134) can compare the difference value with a preset threshold value. Here, the preset threshold value can be set in various ways depending on the specifications of the battery (151, 153, or 155). The diagnostic unit (134) can diagnose an abnormality in the battery (151, 153, or 155) or battery pack based on the comparison result.

[0074] According to one embodiment, the abnormality processing unit (135) may perform an abnormality processing function based on the abnormality diagnosis result of the battery (151, 153, or 155). Here, the abnormality processing function may include a notification function or a short circuit function.

[0075] According to one embodiment, the abnormality processing unit (135) can transmit the abnormality diagnosis result of the battery (151, 153, or 155) to a user terminal (104) connected via a wired and / or wireless network.

[0076] According to one embodiment, the abnormality processing unit (135) may isolate the abnormal battery from the electronic device (102) based on the abnormality diagnosis result of the battery (151, 153, or 155). Here, the isolation may include electrical and / or mechanical isolation.

[0077] Fig. 3 is a flowchart illustrating the operation of a battery diagnostic device according to one embodiment. Fig. 3 can be explained using the configurations of Fig. 1.

[0078] The embodiment illustrated in FIG. 3 is only one embodiment, and the order of steps according to various embodiments of the present invention may be different from that illustrated in FIG. 3, and some of the steps illustrated in FIG. 3 may be omitted, the order between steps may be changed, or steps may be merged.

[0079] Referring to FIG. 3, in operation 305, the battery diagnostic device (101) may obtain status data indicating the SOC and voltage standard score (Z-Score) of the battery (151, 153, or 155). Here, the status data may indicate the voltage standard score according to the SOC of the battery (151, 153, or 155). In other words, the voltage standard score at a specific SOC of the battery (151, 153, or 155) may be known through the status data.

[0080] According to one embodiment, the battery diagnostic device (101) can obtain the status data generated by an external electronic device using a communication circuit (110).

[0081] According to one embodiment, the battery diagnostic device (101) can obtain the status data based on the status value of the battery collected using a communication circuit (110) and / or a sensor (120).

[0082] According to one embodiment, the battery diagnostic device (101) may collect signals related to the status of a plurality of batteries (151, 153, 155) using a communication circuit (110) and / or a sensor (120) for each unit time and record the status values ​​(e.g., voltage value, current value, temperature value, resistance value, SOC, etc.) of the plurality of batteries (151, 153, 155) in a memory (130). Here, the unit time may be an integer multiple of a status signal reception cycle of the communication circuit (110) or a status measurement cycle of the sensor (120).

[0083] According to one embodiment, the battery diagnosis device (101) may generate status data indicating a voltage standard score according to the SOC of the battery (151, 153, or 155) based on the status values ​​of the plurality of batteries (151, 153, 155) recorded in the memory (130). For example, the battery diagnosis device (101) may generate the status data after calculating the voltage standard score of the battery (151, 153, or 155) based on the voltage values ​​of the plurality of batteries (151, 153, 155). At this time, the number of status data may increase by 1 each time the status values ​​of the plurality of battery cells (151, 153, 155) are acquired.

[0084] In operation 310, the battery diagnostic device (101) can estimate a first SOC section in which balancing of the battery (151, 153, or 155) occurs and a second SOC section in which balancing does not occur based on the state data acquired in operation 305. Here, the balancing may mean balancing performed by the battery (151, 153, and / or 155) itself to uniformly adjust the voltage or SOC between the plurality of batteries (151, 153, 155) or balancing performed by the electronic device (102) on the battery (151, 153, and / or 155).

[0085] According to one embodiment, the battery diagnostic device (101) can estimate a first SOC section and a second SOC section based on a change amount of a voltage standard score according to the SOC of the battery (151, 153, or 155). Here, the first SOC section includes an SOC section in which the change amount is greater than or equal to a specified value in the status data, and in the second SOC section, the change amount may be less than the specified value.

[0086] In operation 315, the battery diagnostic device (101) may extract a first voltage standard score and a second voltage standard score of the battery (151, 153, or 155) based on the state data. Here, the first voltage standard score may correspond to the first SOC section estimated in operation 310, and the second voltage standard score may correspond to the second SOC section estimated in operation 310. Specifically, the first voltage standard score may be a representative voltage standard score of the first SOC section, and the second voltage standard score may be a representative voltage standard score of the second SOC section.

[0087] According to one embodiment, the battery diagnostic device (101) can extract the maximum voltage standard score of the battery (151, 153, or 155) in the first SOC section as the first voltage standard score. In addition, the battery diagnostic device (101) can extract the minimum voltage standard score of the battery (151, 153, or 155) in the second SOC section as the second voltage standard score.

[0088] In operation 320, the battery diagnosis device (101) can diagnose an abnormality of the battery (151, 153, or 155) based on the first voltage standard score and the second voltage standard score extracted in operation 315. As another example, when a plurality of batteries (151, 153, 155) are battery cells included in one battery pack, the battery diagnosis device (101) can also diagnose an abnormality of the battery pack including the plurality of batteries (151, 153, 155) based on the first voltage standard score and the second voltage standard score.

[0089] According to one embodiment, the battery diagnostic device (101) can diagnose an abnormality in the battery (151, 153, or 155) or battery pack based on a difference value between the first voltage standard score and the second voltage standard score.

[0090] According to one embodiment, the battery diagnostic device (101) can diagnose an abnormality in the battery (151, 153, or 155) or battery pack by comparing the difference value with a preset threshold value.

[0091] The operation 320 of the battery diagnostic device (101) diagnosing an abnormality of the battery (151, 153, or 155) or battery pack can be specifically described through FIG. 4, which will be described later.

[0092] Fig. 4 is a flowchart illustrating the operation of a battery diagnostic device according to one embodiment. Fig. 4 can be explained using the configurations of Fig. 1.

[0093] The embodiment illustrated in FIG. 4 is only one embodiment, and the order of steps according to various embodiments of the present invention may be different from that illustrated in FIG. 4, and some of the steps illustrated in FIG. 4 may be omitted, the order between steps may be changed, or steps may be merged.

[0094] Referring to FIG. 4, in operation 405, the battery diagnostic device (101) may calculate a difference value between a first voltage standard score and a second voltage standard score. Here, the difference value may be a value obtained by subtracting a smaller value from a larger value between the first voltage standard score and the second voltage standard score.

[0095] In operation 410, the battery diagnostic device (101) can compare the difference value calculated in operation 410 with a preset threshold value. Here, the preset threshold value can be set in various ways depending on the specifications of the battery (151, 153, or 155).

[0096] In operation 415, the battery diagnostic device (101) can diagnose an abnormality in the battery (151, 153, or 155) or battery pack based on the comparison result of operation 410.

[0097] 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 meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense, unless explicitly defined in this document.

Claims

1. An acquisition unit that acquires status data indicating the SOC (State of Charge) and voltage standard score (Z-Score) of the battery; An estimation unit that estimates a first SOC section in which balancing of the battery occurs and a second SOC section in which balancing does not occur based on the above state data; An extraction unit that extracts a first voltage standard score corresponding to the first SOC section and a second voltage standard score corresponding to the second SOC section based on the above state data; and A battery diagnostic device, comprising a diagnostic unit that diagnoses an abnormality of the battery based on the first voltage standard score and the second voltage standard score.

2. In claim 1, A battery diagnostic device, wherein the above status data represents a voltage standard score according to the SOC of the battery.

3. In claim 2, A battery diagnostic device, wherein the estimation unit estimates the first SOC section and the second SOC section based on the amount of change in the voltage standard score according to the SOC of the battery.

4. In claim 3, The above first SOC section includes a SOC section in which the change amount in the state data is greater than or equal to a specified value, A battery diagnostic device, wherein the amount of change in the second SOC section is less than the specified value.

5. In claim 1, The above extraction part, The maximum voltage standard score of the above first SOC section is extracted as the first voltage standard score, A battery diagnostic device that extracts the minimum voltage standard score of the second SOC section as the second voltage standard score.

6. In claim 1, A battery diagnostic device, wherein the diagnostic unit diagnoses an abnormality in the battery based on a difference value between the first voltage standard score and the second voltage standard score.

7. In claim 6, The above diagnostic unit is a battery diagnostic device that diagnoses an abnormality in the battery by comparing the difference value with a preset threshold value.

8. In claim 1, Further comprising an abnormality processing unit that performs an abnormality processing function based on the abnormality diagnosis result of the above battery, A battery diagnostic device, wherein the above abnormal processing function includes a notification function or a short circuit function.

9. An operation to obtain status data indicating the battery's SOC (State of Charge) and voltage standard score (Z-Score); An operation of estimating a first SOC section in which balancing of the battery occurs and a second SOC section in which balancing does not occur based on the above state data; An operation of extracting a first voltage standard score corresponding to the first SOC section and a second voltage standard score corresponding to the second SOC section based on the above state data; and An operating method of a battery diagnosis device, comprising an operation of diagnosing an abnormality of the battery based on the first voltage standard score and the second voltage standard score.

10. In claim 9, A method of operating a battery diagnostic device, wherein the above status data represents a voltage standard score according to the SOC of the battery.

11. In claim 10, A method for operating a battery diagnostic device, wherein the operation of estimating the first SOC section and the second SOC section includes an operation of estimating the first SOC section and the second SOC section based on a change amount of a voltage standard score according to the SOC of the battery.

12. In claim 11, The above first SOC section includes a SOC section in which the change amount in the state data is greater than or equal to a specified value, An operating method of a battery diagnostic device, wherein the amount of change in the second SOC section is less than the specified value.

13. In claim 9, The operation of extracting the first voltage standard score and the second voltage standard score is: An operation of extracting the maximum voltage standard score of the first SOC section as the first voltage standard score, and An operating method of a battery diagnostic device, comprising an operation of extracting a minimum voltage standard score of the second SOC section as the second voltage standard score.

14. In claim 9, A method for operating a battery diagnosis device, wherein the operation of diagnosing an abnormality of the battery includes an operation of diagnosing an abnormality of the battery based on a difference value between the first voltage standard score and the second voltage standard score.

15. In claim 14, A method for operating a battery diagnosis device, wherein the operation of diagnosing an abnormality in the battery includes an operation of diagnosing an abnormality in the battery by comparing the difference value with a preset threshold value.

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