Battery diagnosis apparatus and operation method thereof

Abstract

A battery diagnosis apparatus according to an embodiment disclosed in the present document may comprise: a slave BMS for generating unit state information by measuring the state of a battery unit; a management unit for generating pack state information by measuring the state of a battery pack, and comprising a control unit for controlling an operation of a relay related to power supply of the battery pack on the basis of at least one of the unit state information and the pack state information; and a master BMS for receiving the unit state information and the pack state information from the management unit, and monitoring battery cells included in at least one of the battery unit and the battery pack on the basis of at least one of the unit state information and the pack state information.

Description

Battery diagnostic device and method of operation thereof

[0001] Cross-citation with related applications

[0002] This invention claims the benefit of priority to Korean Patent Application No. 10-2023-0144565, filed October 26, 2023, the entire contents of which are incorporated herein by reference.

[0003] Technology field

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

[0005] Recently, active research and development has been conducted on secondary batteries. The term "secondary battery" refers to a rechargeable battery, encompassing both conventional Ni / Cd and Ni / MH batteries, as well as 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 a popular power source 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] As the industrial sector utilizing batteries expands, battery management systems (BMSs), which diagnose battery safety, are also evolving. BMSs utilize a variety of diagnostic algorithms to assess battery performance and implement appropriate control based on battery condition.

[0007] A BMS may include a master BMS and a slave BMS. The slave BMS can manage the battery modules contained in the battery pack using status information about the battery modules. The master BMS receives status information about the battery modules from the slave BMS and can monitor the status of the battery modules and battery cells contained in the battery pack by measuring the voltage, current, and resistance values ​​of each battery pack unit.

[0008] The master BMS performs data exchange with the slave BMS through wired or wireless communication, and when it receives information about an abnormal battery from the slave BMS, it controls the operation of the relay connecting the battery pack and the load, thereby preventing accidents such as explosions caused by an abnormal battery.

[0009] However, even if communication between the master BMS and the slave BMS is performed normally, there is a problem that a delay in response to an abnormal signal may occur because the master BMS performs relay control after collecting multiple data from multiple slave BMSs.

[0010] In addition, if there is a problem in the communication between the master BMS and the slave BMS, and the master BMS does not receive an abnormal signal or the master BMS is in an inactive state (e.g., the electric vehicle is turned off), the master BMS cannot perform relay control, so there is a problem that an abnormality may occur not only in the battery pack but also in the load connected to the battery pack due to the abnormal battery.

[0011] 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.

[0012] A battery diagnostic device according to an embodiment disclosed in the present document may include: a slave BMS configured to measure a state of a battery unit to generate unit state information; a management unit configured to measure a state of a battery pack to generate pack state information and to control an operation of a relay related to power supply of the battery pack based on at least one of the unit state information and the pack state information; and a master BMS configured to receive the unit state information and the pack state information from the management unit and to monitor battery cells included in at least one of the battery unit and the battery pack based on at least one of the unit state information and the pack state information.

[0013] In one embodiment, the controller may open the relay when at least one of the unit status information and the pack status information includes an abnormal signal.

[0014] In one embodiment, the management unit may further include a communication interface configured to communicate with the master BMS or the slave BMS.

[0015] In one embodiment, the communication interface and the slave BMS can operate on power supplied from a constant power source.

[0016] In one embodiment, the communication interface may activate the controller when the unit status information includes an abnormal signal, and the controller may open the relay.

[0017] In one embodiment, the battery unit may be a battery module or battery cell included in the battery pack.

[0018] In one embodiment, the unit status information may include at least one of voltage, current, and temperature values ​​of each of the battery cells included in the battery unit.

[0019] In one embodiment, the pack status information may include at least one of a voltage, current, and insulation resistance value of the battery pack.

[0020] An operating method of a battery diagnostic device according to an embodiment disclosed in this document may include an operation of measuring a state of a battery unit to generate unit state information; an operation of measuring a state of a battery pack to generate pack state information; and an operation of controlling an operation of a relay related to power supply of the battery pack based on at least one of the unit state information and the pack state information.

[0021] In one embodiment, the controlling operation may open the relay when at least one of the unit status information and the pack status information includes an abnormal signal.

[0022] In one embodiment, the method may further include an operation of generating the pack status information and an operation of activating at least one of the controlling operations when the unit status information includes an abnormal signal.

[0023] In one embodiment, the battery unit may be a battery module or battery cell included in the battery pack.

[0024] In one embodiment, the unit status information may include at least one of voltage, current, and temperature values ​​of each of the battery cells included in the battery unit.

[0025] In one embodiment, the pack status information may include at least one of a voltage, current, and insulation resistance value of the battery pack.

[0026] The battery diagnostic device and its operating method according to various embodiments disclosed in this document can shorten the time generated by the process of the master BMS collecting information from a plurality of slave BMSs by performing relay operation control performed by the master BMS using a separate configuration.

[0027] In addition, the battery diagnostic device and the operating method thereof according to various embodiments disclosed in this document connect the communication interface and at least one slave BMS, so that the communication interface can receive an abnormal signal even when the master BMS is in an inactive state (e.g., the electric vehicle is turned off) or communication between the master BMS and the slave BMS is not smooth.

[0028] The effects of the battery diagnostic device and the operating method thereof according to the disclosure of this document are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art according to the disclosure of this document.

[0029] FIG. 1 illustrates a system for supplying power to a load using a battery pack according to one embodiment disclosed in this document.

[0030] FIG. 2 is a block diagram showing a battery diagnostic device according to one embodiment disclosed in this document.

[0031] FIGS. 3 and 4 are block diagrams showing a management unit according to various embodiments disclosed in this document.

[0032] FIG. 5 is a flowchart illustrating a method for controlling the operation of a relay by a battery diagnostic device according to an embodiment disclosed in this document.

[0033] FIG. 6 is a flowchart illustrating a method for activating a function for controlling the operation of a relay by a battery diagnostic device according to an embodiment disclosed in this document.

[0034] FIG. 7 is a block diagram showing the hardware configuration of a computing system that implements an operating method of a battery diagnostic device according to an embodiment disclosed in this document.

[0035] In connection with the description of the drawings, the same or similar reference numerals may be used for identical or similar components.

[0036] Hereinafter, 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.

[0037] The embodiments and terminology used in this document are not intended to limit the technical features described in this document to a specific embodiment, but should be understood to encompass various modifications, equivalents, or alternatives of the embodiment. In connection with the description of the drawings, similar reference numerals may be used to refer to similar or related components. The singular form of a noun corresponding to an item may include one or more of the item, unless the relevant context clearly indicates otherwise.

[0038] In this document, the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" can each include any one of the items listed together in that phrase, or all possible combinations thereof. Terms such as "first", "second", "first", "second", "A", "B", "(a)", or "(b)" may be used merely to distinguish the corresponding component from other corresponding components, and do not limit the corresponding components in any other respect (e.g., importance or order) unless specifically stated otherwise.

[0039] In this document, when a component (e.g., a first component) is referred to as being “connected,” “coupled,” or “connected,” with or without the terms “functionally” or “communicatively,” or “coupled” or “connected,” it means that the component can be connected to the other component directly (e.g., wired or wirelessly), or indirectly (e.g., via a third component).

[0040] The methods according to various embodiments disclosed in this document may be provided as included in a computer program product. The computer program product may be traded as a commodity between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read-only memory, CD-ROM), or may be distributed online (e.g., downloaded or uploaded) through an application store or directly between two user devices. In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0041] According to the embodiments disclosed in this document, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to the embodiments disclosed in this document, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to the embodiments disclosed in this document, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

[0042] FIG. 1 illustrates a system for supplying power to a load using a battery pack according to one embodiment disclosed in this document.

[0043] Referring to FIG. 1, a battery pack (1) can supply power to a load (10). The battery pack (1) can supply power to the load (10) when the relay (12) is short-circuited. Here, the load (10) may be a load included in 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)), or other electronic devices. Hereinafter, the load (10) is described as referring to a load included in an electric vehicle.

[0044] The battery pack (1) can control the operation of the relay (12). For example, the battery pack (1) can cut off the power supply to the load (10) by opening the relay (12) when an abnormal battery cell is detected. This can prevent an abnormality from occurring in the load (10).

[0045] Hereinafter, with reference to FIGS. 2 to 7, a method for controlling the operation of a relay (12) connecting a battery pack (1) and a load (10) by a battery diagnostic device included in a battery pack (1) will be described.

[0046] FIG. 2 is a block diagram showing a battery diagnostic device according to one embodiment disclosed in this document.

[0047] Referring to FIG. 2, the battery diagnostic device (2) may include a master BMS (20), a management unit (22), and slave BMSs (24, 26). In one embodiment, the battery diagnostic device (2) may be included in a BMS capable of diagnosing a battery pack (1), and operations performed in the battery diagnostic device (2) may be performed in the BMS. In addition, the operations of the battery diagnostic device (2) may be performed by a BMS included in the battery pack (1), as well as in various devices such as a server, a cloud charger, or a charger / discharger.

[0048] The master BMS (20) can monitor the status of battery cells included in the battery pack (1). The master BMS (20) can obtain status information generated by the management unit (22) and each of the slave BMSs (24, 26) to monitor the status of the battery pack (1) or each of the battery cells included in the battery pack (1). Here, the status information can include at least one of voltage, current, resistance, state of charge (SOC), state of health (SOH), and temperature of the battery pack (1) or each of the battery cells.

[0049] Each of the slave BMSs (24, 26) can measure the status of each of the battery units (240, 260). Here, each of the battery units (240, 260) may refer to a set including one or more battery cells. For example, each of the battery units (240, 260) may be a battery module or a battery cell included in the battery pack (1). In FIG. 2, although the number of battery units is illustrated as two, this is not limited thereto, and the number of battery units may be n (n: a natural number).

[0050] The first battery unit (240) may include a plurality of battery cells (242, 244). In FIG. 2, only the battery cells (242, 244) included in the first battery unit (240) are illustrated, but the second battery unit (260) may also include a plurality of battery cells. In addition, in FIG. 2, the number of battery cells (242, 244) included in the first battery unit (240) is illustrated as two, but this is not limited thereto, and the first battery cell () may be configured to include m (m: a natural number greater than or equal to 2) battery cells. According to an embodiment, the plurality of battery cells (242, 244) may be, but are not limited to, a lithium-ion (Li-ion) battery, a lithium-ion polymer (Li-ion polymer) battery, a nickel-cadmium (Ni-Cd) battery, a nickel-metal hydride (Ni-MH) battery, a lithium iron phosphate (LFP) battery, a nickel-cobalt-manganese (NCM) battery, and the like.

[0051] Each of the slave BMSs (24, 26) can generate unit status information. Here, the unit status information can include at least one of voltage, current, and temperature values ​​of each of the battery cells included in the battery unit. For example, the first slave BMS (24) can measure the status of each of the plurality of battery cells (242, 244) included in the first battery unit (240) and generate first unit status information including at least one of voltage, current, and temperature values ​​of each of the battery cells (242, 244).

[0052] The slave BMSs (24, 26) may be connected in a daisy chain manner. Here, the daisy chain manner may refer to a method of sequentially connecting multiple devices in a bus wiring manner. For example, the first slave BMS (24) may be connected to the second slave BMS (26), and the second slave BMS (26) may be connected to the third slave BMS (not shown). The third unit status information generated in the third slave BMS (not shown) may be transmitted to the first slave BMS (24) via the second slave BMS (26), and the first slave BMS (24) may transmit the third unit status information to the management unit (22).

[0053] The management unit (22) can receive unit status information generated from each of the slave BMSs (24, 26) through the first slave BMS (24). For example, the management unit (22) can receive first unit status information regarding the first battery unit (240) from the first slave BMS (24). The management unit (22) can receive second unit status information regarding the second battery unit (260) from the second slave BMS (26) through the first slave BMS (24).

[0054] The management unit (22) can measure the status of the battery pack (1) to generate pack status information. Here, the pack status information can include at least one of the voltage, current, and insulation resistance values ​​of the battery pack (1), but is not limited thereto.

[0055] The management unit (22) can control the operation of the relay (12) related to the power supply of the battery pack (1) based on at least one of the unit status information and the pack status information. The management unit (22) can control the operation of the relay (12) related to the power supply of the battery pack (1) when at least one of the unit status information and the pack status information includes an abnormal signal. For example, the management unit (22) can open the relay (12) when it receives first unit status information including an abnormal signal for the first battery cell (242).

[0056] The management unit (22) can cut off the power supply to the load (10) by opening the relay (12). By cutting off the power supply to the load (10), the management unit (22) can prevent a situation in which an abnormality occurs in the load (10). In addition, since the management unit (22) controls the operation of the relay (12) based on at least one of the unit status information and the pack status information, the time required for the master BMS (20) to collect all information and control the operation of the relay (12) can be shortened.

[0057] FIGS. 3 and 4 are block diagrams showing a management unit according to various embodiments disclosed in this document.

[0058] Referring to FIG. 3, the management unit (22) may include a communication interface (220) and a controller (222).

[0059] The communication interface (220) can communicate with the master BMS (20) or slave BMSs (24, 26). The communication interface (220) can perform data exchange between the master BMS (20) and slave BMSs (24, 26).

[0060] The controller (222) can measure the status of the battery pack (1) and generate pack status information.

[0061] The controller (222) can receive unit status information generated from each of the slave BMSs (24, 26). The controller (222) can obtain unit status information generated from each of the slave BMSs (24, 26) through the first slave BMS (24). For example, the controller (222) can obtain first unit status information generated by the first slave BMS (24) from the first slave BMS (24). The controller (222) can obtain second unit status information generated by the second slave BMS (26) through the first slave BMS (24) connected to the second slave BMS (26) in a daisy chain manner.

[0062] The controller (222) can control the operation of the relay (12) related to the power supply of the battery pack (1) based on at least one of the unit status information and the pack status information. The controller (222) can open the relay (12) when an abnormal signal is included in at least one of the unit status information and the pack status information.

[0063] Referring to FIG. 4, the communication interface (220) can be connected to the second slave BMS (26) by wire or wirelessly.

[0064] The communication interface (220) can obtain unit status information through the second slave BMS (26). Here, the unit status information can include first unit status information generated by the first slave BMS (24) and second unit status information generated by the second slave BMS (26). For example, the communication interface (220) can obtain second unit status information generated by the second slave BMS (26) from the second slave BMS (26). In addition, the communication interface (220) can receive first unit status information generated by the first slave BMS (24) through the second slave BMS (26) connected to the first slave BMS (24) in a daisy chain manner.

[0065] In one embodiment, the communication interface (220) and the slave BMSs (24, 26) can be supplied with power through a constant power source. The communication interface (220) and the slave BMSs (24, 26) can be in a constant active state by being supplied with power through a constant power source. Here, the constant power source is a power source external to the battery pack (1), such as a 12 V battery included in the electric vehicle. For example, the first slave BMS (24) and the second slave BMS (26) can measure the states of the first battery unit (240) and the second battery unit (260) through power supplied from the constant power source. The communication interface (220) can receive unit state information from the second slave BMS (26). Here, the reason why power is constantly supplied only to the communication interface (220) and slave BMSs (24, 26) is to use the minimum power in detecting abnormal battery cells and controlling the operation of the relay (12).

[0066] The communication interface (220) is connected to the second slave BMS (26) by wire or wirelessly, so that the controller (222) can receive unit status information including an abnormal signal through the second slave BMS (26) even when the controller is in an inactive state (e.g., when the electric vehicle is turned off).

[0067] The communication interface (220) can activate the controller (222) when an abnormal signal is included in the unit status information obtained through the second slave BMS (26). The communication interface (220) can control the operation of the relay (12) by activating the controller (222) when receiving unit status information including an abnormal signal through the second slave BMS (26).

[0068] In one embodiment, the communication interface (220) may generate a wake-up signal when the unit status information includes an abnormal signal. The communication interface (220) may activate the controller (222) based on the wake-up signal. The controller (222) may be activated based on the wake-up signal to control the operation of the relay (12). Here, the wake-up signal may refer to a signal that activates the controller (222).

[0069] As a result, by supplying power to the slave BMSs (24, 26) through the constant power, it is possible to measure the status of the battery units (240, 260) at designated intervals to detect abnormal signals, and by supplying power to the communication interface (220) through the constant power, it is possible to activate the controller (222) in an inactive state, thereby enabling the controller (222) to perform diagnosis of the battery pack (1) and control the operation of the relay (12).

[0070] FIG. 5 is a flowchart illustrating a method for controlling the operation of a relay by a battery diagnostic device according to an embodiment disclosed in this document.

[0071] Referring to FIG. 5, in operation 500, the battery diagnostic device (2) can generate unit status information.

[0072] In operation 502, the battery diagnostic device (2) can generate pack status information.

[0073] In operation 504, the battery diagnostic device (2) can control the operation of the relay based on at least one of the unit status information and the pack status information. The battery diagnostic device (2) can open the relay (12) when an abnormal signal is included in at least one of the unit status information and the pack status information.

[0074] FIG. 6 is a flowchart illustrating a method for activating some operating methods of a battery diagnostic device according to an embodiment disclosed in this document.

[0075] Below, a method for activating operations performed in some components (e.g., master BMS (20) and controller (222)) of a battery diagnostic device (2) is described, assuming that some components (e.g., master BMS (20) and controller (222)) are in an inactive state.

[0076] In operation 600, the battery diagnostic device (2) can generate unit status information. For example, slave BMSs (24, 26) of the battery diagnostic device (2) can generate unit status information by measuring the status of battery units (240, 260) at designated intervals by receiving power through a constant power source.

[0077] In operation 602, the battery diagnostic device (2) can check whether the unit status information includes an abnormal signal. For example, the communication interface (220) of the battery diagnostic device (2) can check whether the unit status information includes an abnormal signal by receiving power through a constant power source. In one embodiment, the communication interface (220) is connected to the second slave BMS (26) and can obtain the unit status information generated by each of the slave BMSs (24, 26) through the second slave BMS (26).

[0078] The battery diagnostic device (2) can continuously monitor whether an abnormal battery cell is detected by returning to operation 600 and generating unit status information at designated intervals when the unit status information does not include an abnormal signal.

[0079] In operation 604, the battery diagnostic device (2) may generate a wake-up signal if the unit status information includes an abnormal signal. For example, the communication interface (220) of the battery diagnostic device (2) may generate a wake-up signal if the unit status information includes an abnormal signal.

[0080] In operation 606, the battery diagnostic device (2) can activate an operation for generating pack status information based on a wake-up signal (Fig. 5, operation 502) and / or an operation for controlling the operation of the relay (12) (Fig. 5, operation 504). For example, the communication interface (220) of the battery diagnostic device (2) can activate a controller (222) based on the wake-up signal, and the activated controller (222) can measure the status of the battery pack (1) and generate pack status information therefor.

[0081] FIG. 7 is a block diagram showing the hardware configuration of a computing system that implements an operating method of a battery diagnostic device according to an embodiment disclosed in this document.

[0082] Referring to FIG. 7, a computing system (70) according to one embodiment disclosed in this document may include an MCU (700), a memory (710), an input / output I / F (720), and a communication I / F (730).

[0083] The MCU (700) may be a processor that executes various programs (e.g., a battery diagnostic program) stored in the memory (710), processes various data from these programs, and performs the functions of the battery management device (2) shown in the aforementioned FIGS. 2 to 4.

[0084] The memory (710) can store various programs related to the operation of the battery management device (2). In addition, the memory (710) can store operation data of the battery management device (2).

[0085] A plurality of such memories (710) may be provided as needed. The memories (710) may be volatile memories or non-volatile memories. As volatile memories (710), RAM, DRAM, SRAM, etc. may be used. As non-volatile memories (710), ROM, PROM, EAROM, EPROM, EEPROM, flash memories, etc. may be used. The examples of the memories (710) listed above are merely examples and are not limited to these examples.

[0086] The input / output I / F (720) 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 (700).

[0087] The communication I / F (730) is a component capable of transmitting and receiving various data with the server, and may be any device capable of supporting wired or wireless communication. For example, programs for resistance measurement and abnormality diagnosis, as well as various data, can be transmitted and received from a separately provided external server via the communication I / F (730).

[0088] The terms "include," "comprise," or "have" used herein, unless otherwise specifically stated, imply that the corresponding component may be included, and therefore should be interpreted to include other components rather than to exclude other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed in this document pertain, unless otherwise defined. Commonly used terms, such as terms defined in dictionaries, should be interpreted to be consistent with their contextual meaning in the relevant art, and shall not be interpreted in an idealized or overly formal sense, unless explicitly defined in this document.

[0089] 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. Therefore, the embodiments disclosed in this document are not intended to limit the technical idea of ​​the embodiments disclosed in this document, but to explain it, and the scope of the technical idea disclosed in this document is not limited by these embodiments. The scope of protection of the technical idea disclosed in this document should be interpreted by the claims below, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of rights of this document.

Claims

1. A slave BMS that measures the status of the battery unit and generates unit status information; A management unit including a controller that measures the state of a battery pack to generate pack state information and controls the operation of a relay related to power supply of the battery pack based on at least one of the unit state information and the pack state information; and A master BMS that receives the unit status information and the pack status information from the management unit and monitors battery cells included in at least one of the battery unit and the battery pack based on at least one of the unit status information and the pack status information. Battery diagnostic device.

2. In claim 1, The above controller, Opening the relay when at least one of the unit status information and the pack status information includes an abnormal signal. Battery diagnostic device.

3. In claim 1, The above management unit, Further comprising a communication interface configured to communicate with the master BMS or the slave BMS, Battery diagnostic device.

4. In claim 3, The above communication interface and the slave BMS, It operates on power supplied from a constant power source. Battery diagnostic device.

5. In claim 4, The above communication interface is, If the above unit status information includes an abnormal signal, the controller is activated, The above controller, Opening the above relay, Battery diagnostic device.

6. In claim 1, The above battery unit is a battery module or battery cell included in the battery pack. Battery diagnostic device.

7. In claim 1, The unit status information includes at least one of the voltage, current, and temperature values ​​of each battery cell included in the battery unit. Battery diagnostic device.

8. In claim 1, The pack status information includes at least one of the voltage, current, and insulation resistance values ​​of the battery pack. Battery diagnostic device.

9. An action to measure the status of a battery unit and generate unit status information; An operation for measuring the condition of a battery pack and generating pack condition information; and An operation for controlling the operation of a relay related to power supply of the battery pack based on at least one of the unit status information and the pack status information, Method of operation of a battery diagnostic device.

10. In claim 9, The above controlling action is, Opening the relay when at least one of the unit status information and the pack status information includes an abnormal signal. Method of operation of a battery diagnostic device.

11. In claim 9, Further comprising an action of generating the pack status information and an action of activating at least one of the controlling actions when the unit status information includes an abnormal signal. Method of operation of a battery diagnostic device.

12. In claim 9, The above battery unit is a battery module or battery cell included in the battery pack. Method of operation of a battery diagnostic device.

13. In claim 9, The unit status information includes at least one of the voltage, current, and temperature values ​​of each battery cell included in the battery unit. Method of operation of a battery diagnostic device.

14. In claim 9, The pack status information includes at least one of the voltage, current, and insulation resistance values ​​of the battery pack. Method of operation of a battery diagnostic device.

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