Battery management device and method

Abstract

The battery management device and method for monitoring a battery status in conjunction with a battery protection device connected to one or more battery modules monitors a plurality of battery cells included in one or more battery modules, and when an abnormality occurs in one or more of the plurality of battery cells, selects one of the battery modules excluding the battery module including the battery cell in which the abnormality occurs as a power supply module by transmitting a control signal to a battery power control device connected to the plurality of battery modules to connect the selected power supply module to the battery protection device, and acquires status data of the battery cell in which the abnormality occurs by receiving power from the battery protection device connected to the power supply module. Thus, even when a charging / discharging circuit is cut off for battery protection, the device and method are capable of continuously monitoring the status of a battery in which an abnormality occurs using a normally charged battery voltage, and provides a highly efficient, low-cost, and highly reliable battery management device and method.

Description

Technical Field

[0001] This application claims the benefit of the filing date of Korean Patent Application No. 10-2022-0013910, filed with the Korean Intellectual Property Office on February 3, 2022, and all of the content disclosed in the document of the Korean patent application is incorporated herein by reference.

[0002] The present invention relates to a battery management device and method, and more specifically, to a battery management device and method capable of continuously monitoring the state of a battery in which an abnormality has occurred using the voltage of a normally charged battery module even when a charge / discharge circuit is interrupted due to an abnormality in a battery cell.

Background Art

[0003] Recently, batteries have been applied to many industrial fields such as mobile devices, automobiles, robots, and energy storage devices as a countermeasure against environmental regulations and rising crude oil prices.

[0004] Generally, a battery cell is provided as a rechargeable secondary battery, but such a battery has disadvantages such as catching fire during overcharging or deteriorating during over-discharging, resulting in a reduced lifespan.

[0005] Accordingly, a conventional battery management device provides a battery protection circuit that interrupts a charge or discharge circuit when an abnormality occurs in a battery cell in order to protect the battery cell. For example, the battery protection circuit interrupts the charge or discharge circuit by controlling the operation of a switch connected to a plurality of battery cells.

[0006] On the one hand, the battery management device can have a driving voltage applied through the battery protection circuit. Therefore, when an abnormality occurs in any one battery cell and the charge-discharge circuit is interrupted, the operation of the battery management device is stopped, and it cannot perform battery diagnosis and monitoring functions. Thus, since the battery management device cannot secure the state data of the abnormal battery, there is little data available for analysis, the reliability decreases during the analysis of the abnormal battery, and it is difficult to understand the state change of the battery until before inspection or recovery of the battery.

[0007] In addition, when an abnormality occurs in any one battery cell within the battery pack, the use of the normally operating battery cells is also interrupted together, so there is a disadvantage in that the efficiency decreases.

Summary of the Invention

Problems to be Solved by the Invention

[0008] An object of the present invention for solving the above problems is to provide a battery management device with high efficiency, low cost, and high reliability.

[0009] Another object of the present invention for solving the above problems is to provide a battery management method with high efficiency, low cost, and high reliability.

Means for Solving the Problems

[0010] A battery management device that monitors the battery state in conjunction with a battery protection device connected to one or more battery modules according to an embodiment of the present invention for achieving the above object includes a memory and a processor that executes at least one instruction of the memory. The at least one instruction includes an instruction to monitor a plurality of battery cells included in the one or more battery modules, an instruction to select one of the battery modules excluding the battery module including the battery cell in which an abnormality has occurred as a power supply module when an abnormality occurs in one or more of the plurality of battery cells, an instruction to transmit a control signal to a battery power control device connected to the plurality of battery modules to connect the selected power supply module and the battery protection device, and an instruction to receive state data of the battery cell in which an abnormality has occurred while being supplied with power from the battery protection device connected to the power supply module.

[0011] Here, the instruction to select one of the battery modules as a power supply module may include an instruction to confirm the position of the battery cell in which an abnormality has occurred and an instruction to select the battery module that is farthest away from the module including the battery cell in which the abnormality has occurred as the power supply module.

[0012] At this time, in the instruction to select the battery module that is farthest away from the module including the battery cell in which the abnormality has occurred as the power supply module, when there are a plurality of any one battery modules that are farthest away from the battery cell in which the abnormality has occurred, the power supply module can be selected by comparing the state of charge (SOC) or state of health (SOH) of the battery modules.

[0013] Here, the instruction to select, as the power supply module, the battery module that is farthest from the module including the battery cell in which the above abnormality has occurred may include an instruction to select, as the power supply module, the battery module that is closer to the negative electrode side among the above battery modules when at least one of the SOC or SOH values of the above battery modules is the same.

[0014] On the other hand, the battery power control device receives the control signal from the battery management device, and can connect the power supply module and the battery protection device by closing the switch corresponding to the selected power supply module among the plurality of switches in the battery power control device (Closed).

[0015] In addition, the at least one instruction may further include an instruction to reselect, as the power supply module, a battery module having a charge rate equal to or higher than a threshold value among the battery modules excluding the battery module including the battery cell in which the abnormality has occurred when the charging voltage of the power supply module drops below the threshold value.

[0016] A battery management method for performing battery state monitoring in conjunction with a battery protection device connected to one or more battery modules according to another embodiment of the present invention for achieving the above object includes steps of monitoring a plurality of battery cells included in the one or more battery modules, when an abnormality occurs in one or more of the plurality of battery cells, selecting, as the power supply module, one battery module among the battery modules excluding the battery module including the battery cell in which the abnormality has occurred, transmitting a control signal to a battery power control device connected to the plurality of battery modules to connect the selected power supply module and the battery protection device, and obtaining state data of the battery cell in which the abnormality has occurred by being supplied with power from the battery protection device connected to the power supply module.

[0017] Here, the step of selecting the one battery module as the power supply module may include the step of checking the position of the battery cell where an abnormality has occurred, and the step of selecting, as the power supply module, the battery module that is farthest away from the module including the battery cell where the abnormality has occurred.

[0018] At this time, in the step of selecting, as the power supply module, the battery module that is farthest away from the module including the battery cell where the abnormality has occurred, when there are multiple battery modules that are farthest away from the battery cell where the abnormality has occurred, the power supply module can be selected by comparing the state of charge (SOC) or state of health (SOH) of the battery modules.

[0019] Here, the step of selecting, as the power supply module, the battery module that is farthest away from the module including the battery cell where the abnormality has occurred can select, as the power supply module, the battery module that is closer to the negative electrode side among the battery modules when at least one of the SOC or SOH values of the battery modules is the same.

[0020] On the other hand, the battery power control device receives the control signal from the battery management device, and can connect the power supply module and the battery protection device by closing the switch corresponding to the selected power supply module among the plurality of switches in the battery power control device (Closed).

[0021] In addition, when the charging voltage charged to the power supply module drops below the threshold value, the battery management device may further include the step of reselecting, as the power supply module, any one of the battery modules having a charging rate equal to or higher than the threshold value among the battery modules excluding the battery module including the battery cell where the abnormality has occurred.

Advantages of the Invention

[0022] A battery management device and method for performing battery state monitoring in conjunction with a battery protection device connected to one or more battery modules according to an embodiment of the present invention monitors a plurality of battery cells included in one or more battery modules. When an abnormality occurs in one or more of the plurality of battery cells, one of the battery modules excluding the battery module including the battery cell in which the abnormality has occurred is selected as a power supply module, and a control signal is transmitted to a battery power control device connected to the plurality of battery modules to connect the selected power supply module and the battery protection device. By obtaining state data of the battery cell in which the abnormality has occurred while being supplied with power from the battery protection device connected to the power supply module, continuous state monitoring of the battery in which the abnormality has occurred can be performed using the normally charged battery voltage even when the charge / discharge circuit is cut off for battery protection. It is possible to provide a highly efficient, low-cost, and highly reliable battery management device and method capable of ensuring state data for analyzing abnormal batteries without separately providing an external power supply line.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0024] Since the present invention can be subjected to various modifications and can have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but should be understood to include all modifications, equivalents, and alternatives included in the spirit and technical scope of the present invention. Similar reference numerals are used for similar components while explaining each drawing.

[0025] Terms such as first, second, A, B, etc. can be used to describe various components, but the above components should not be limited by the above terms. The above terms are only used for the purpose of distinguishing one component from another. For example, without departing from the scope of the rights of the present invention, the first component can be named the second component, and similarly, the second component can also be named the first component. The term "and / or" includes a combination of a plurality of relatedly described items or one of the plurality of relatedly described items.

[0026] When it is mentioned that a certain component is "coupled to" or "connected to" another component, it should be understood that it may be directly connected or connected to the other component, but there may also be other components in between. On the contrary, when it is mentioned that a certain component is "directly coupled to" or "directly connected to" another component, it should be understood that there is no other component in between.

[0027] The terms used in this application are only used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "including" or "having" are intended to specify the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and it should be understood that the existence or addition possibility of one or more other features, numbers, steps, operations, components, parts, or combinations thereof is not precluded in advance.

[0028] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention pertains. Terms defined as in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted as an ideal or overly formal meaning unless clearly defined in this application.

[0029] Figure 1 is a block diagram of a general battery system.

[0030] Referring to Figure 1, a battery pack or battery module can be configured to include a plurality of battery cells connected in series. The battery cell or module can be connected to a load via a positive terminal and a negative terminal to perform charge and discharge operations. The most commonly used battery cell is a lithium-ion (Li-Ion) battery cell.

[0031] Such a battery cell or battery module can be interlocked with a battery management device (Battery Management System; BMS) via a battery protection device.

[0032] A Battery Management System (BMS) can monitor the current, voltage, and temperature of each battery cell or module it manages, calculate the State of Charge (SOC) based on the monitoring results, and control charging and discharging. Here, SOC (State of Charge; charge rate) represents the current charged state of the battery as a percentage [%], and SOH (State of Health; battery life state) represents the current degradation state of the battery as a percentage [%].

[0033] In this way, the Battery Management System (BMS) can monitor the battery cells, read the cell voltages, and transmit them to other systems connected to the battery. For this purpose, the Battery Management System (BMS) can include a communication module for communicating with other systems within the device that includes the battery system.

[0034] The communication module of the Battery Management System (BMS) can communicate with other systems within the device using Controller Area Network (CAN). In this case, the components, modules, or systems within the Battery Management System (BMS) are connected to each other via the CAN bus. As a result, the Battery Management System (BMS) can remotely transmit the status data obtained through monitoring of the battery pack or module to other systems using CAN communication.

[0035] On the other hand, the Battery Management System (BMS) balances the charges of the battery cells evenly to extend the life of the battery system.

[0036] To perform such operations, a battery management system (BMS) can include various components such as fuses, current sensing elements, thermistors, switches, balancers, etc. In most cases, however, it further includes an MCU (Micro Controller Unit) or BMIC (Battery Monitoring Integrated Chip) to interact with and control these components. Here, the BMIC can be an IC-type component located inside the battery management system (BMS) that measures information such as the voltage, temperature, and current of battery cells / modules.

[0037] According to an embodiment, generally, the battery management system (BMS) interacts with a battery protection device to cut off the charge and discharge circuit by the battery protection device when an abnormality occurs in the battery. In other words, the conventional battery protection circuit restricts the use of the battery by cutting off the charge and discharge circuit when an abnormality occurs in any one battery cell or module.

[0038] On the other hand, a conventional battery management device can be connected to a power supply device (Switched Mode Power Supply; SMPS) inside the battery protection device and powered by a battery power battery cell or module without a separate external power supply line.

[0039] However, since the power supply device (SMPS) is powered through the charge and discharge circuit, when the charge and discharge circuit is cut off, the battery management system (BMS) is not powered, resulting in the interruption of the battery diagnosis and monitoring functions of the battery management system (BMS) when an abnormality occurs in the battery.

[0040] Therefore, the conventional battery management system has the drawback that it is difficult to remotely transmit the state data of the battery accumulated through monitoring due to the interruption of the power supply to the device for remote transmission, thereby limiting the acquisition of state data for analyzing the abnormal battery.

[0041] Therefore, in the present invention, when an abnormal phenomenon of a battery occurs, a power supply is applied from a battery without abnormality, and diagnosis and monitoring of the abnormal battery are continuously performed, so that a battery management device capable of securing state data for analysis will be described.

[0042] FIG. 2 is a block diagram of a battery system according to an embodiment of the present invention.

[0043] Referring to FIG. 2, the battery system can include a battery module 1000, a battery protection device 3000, a battery power control device 5000, and a battery management device 7000.

[0044] The battery module 1000 can include a plurality of battery cells connected in series or in parallel. Here, the commonly used battery cell may be a lithium-ion (Li-Ion) battery cell.

[0045] The battery module 1000 can be connected to a load via a positive terminal and a negative terminal to perform a charge and discharge operation. For example, the load may be an inverter or an upper system.

[0046] The battery protection device 3000 can be connected to any one of the battery modules via a charge and discharge circuit and a battery power control device 5000 described later.

[0047] Also, the battery protection device 3000 can be connected to a battery management device (BMS) 7000 described later. Therefore, the battery management device 7000 can have a drive voltage applied thereto from any one of the power supply modules connected to the charge and discharge circuit or the battery power control device 5000 via the battery protection device 3000.

[0048] On the other hand, when an abnormality occurs in any one of the battery cells, the battery protection device 3000 can cut off the charge and discharge circuit under the control of the battery management device 7000 to protect at least one battery module 1000.

[0049] The battery power control device 5000 can include a plurality of switches individually connected to the battery module 1000. More specifically, the front stage of the switches in the battery power control device 5000 can be connected to the battery module 1000 respectively, and the rear stage can be connected to the power control device (SMPS) in the battery protection device 3000.

[0050] On the other hand, the battery power control device 5000 can individually control the operations of the plurality of switches according to the control signals of the battery management device 7000 described later. At this time, the plurality of switches may be initialized to the open state.

[0051] According to an embodiment, when the battery management device 7000 operates in the monitoring mode, the battery power control device 5000 controls the operation of a specific switch connected to any one of the battery modules 1000, and transmits the power applied from the battery module 1000 to the battery management device 7000 via the power supply device (SMPS) in the battery protection device 3000. Here, the battery module 1000 may be a power supply module.

[0052] As described above, the battery management device 7000 can diagnose and monitor the state of the battery 1000. Thereby, the battery management device 7000 can detect the occurrence of an abnormality in at least one battery cell in the battery module 1000.

[0053] The battery management device 7000 can operate in the management mode or the monitoring mode according to the occurrence of an abnormality in any one battery cell.

[0054] According to an embodiment, when the battery management device 7000 operates in the management mode, the battery management device 7000 can continuously diagnose and monitor the state of at least one battery cell.

[0055] In addition, the battery management device 7000 can remotely transmit the state data of at least one battery cell acquired through monitoring to an external device. Thereby, the user can perform state analysis on the battery cell.

[0056] On the other hand, when an abnormality occurs in any one of the battery cells, the battery management device 7000 can switch the operation mode to the monitoring mode. After that, the battery management device 7000 can send a switch control signal to the battery protection device 3000 to cut off the charge and discharge circuit of the battery protection device 3000.

[0057] Also, when the battery management device 7000 operates in the monitoring mode, the battery management device 7000 can send a control signal for a switch connected to the power supply module to the battery power control device 5000. Thereby, the battery power control device 5000 can control the switch connected to the power supply module to the closed state, and transmit the driving voltage applied from the power supply module to the battery management device 7000 via the battery protection device 3000.

[0058] Therefore, the battery management device 7000 can be continuously powered by the power supply module and continuously perform battery monitoring, so as to ensure continuous state data for the abnormal battery, and by remotely transmitting this to an external device, precise state analysis of the abnormal battery can be achieved.

[0059] On the other hand, the battery management device 7000 is not limited to what is disclosed and can be provided as a Remote Monitoring Device (RMD).

[0060] The Remote Monitoring Device (RMD) may be a device that transmits at least one piece of information about a battery cell or module to an online storage space.

[0061] According to an embodiment, a remote monitoring device (RMD) can be applied to an ESS (Energy Storage System) to store information on at least one ESS battery module in an online server.

[0062] For example, the remote monitoring device (RMD) can collect at least one battery's status and operation information, such as the installation country, region, serial number, and installation time of the ESS battery, as well as the diagnostic information of the ESS battery, for a certain period. Then, the remote monitoring device (RMD) can transmit at least one battery's information to at least one cloud server connected online.

[0063] In FIG. 3 below, the battery management device 7000 will be described in more detail.

[0064] FIG. 3 is a block diagram of a battery management device according to an embodiment of the present invention.

[0065] Referring to FIG. 3, the battery management device 7000 can include a memory 100 and a processor 200.

[0066] More specifically, according to the embodiment, the memory 100 is a space for storing at least one piece of data and can be composed of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 100 can be composed of at least one of a read only memory (ROM) and a random access memory (RAM).

[0067] At this time, the memory 100 can include at least one instruction executed by the processor 200.

[0068] According to an embodiment, at least one instruction may include an instruction to monitor a plurality of battery cells included in the one or more battery modules, an instruction to select, when an abnormality occurs in one or more of the plurality of battery cells, one of the battery modules excluding the battery module including the battery cell in which the abnormality has occurred as a power supply module, an instruction to transmit a control signal to a battery power control device connected to the plurality of battery modules to connect the selected power supply module and the battery protection device, and an instruction to obtain state data of the battery cell in which the abnormality has occurred by being supplied with power from the battery protection device connected to the power supply module.

[0069] The processor 200 may mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the method according to an embodiment of the present invention is performed.

[0070] As described above, the processor 200 may repeatedly execute at least one program command stored in the memory 100.

[0071] The battery management device according to an embodiment of the present invention has been described above. Hereinafter, a battery management method by the operation of the processor of the battery management device will be described in detail.

[0072] FIG. 4 is a flowchart of a battery management method according to an embodiment of the present invention.

[0073] Referring to FIG. 4, the processor 200 in the battery management device 7000 operates in a management mode to monitor whether an abnormal phenomenon occurs in at least any one cell in the plurality of battery modules 1000 (S1000).

[0074] According to an embodiment, the processor 200 can determine that an abnormality has occurred in a battery cell corresponding to the state data when at least one state data is greater than or equal to a threshold value by individually monitoring the current, voltage, and temperature of the battery cell to measure the state data.

[0075] Thereafter, when an abnormality occurs in any one of the battery cells, the processor 200 can switch the operating state of the battery management device 7000 from the management mode to the monitoring mode (S3000). As a result, the processor 200 can control the battery power control device 5000 to apply power for monitoring the state of the battery 1000 from any one of the battery modules (power supply modules).

[0076] More specifically described by the embodiment, the processor 200 can diagnose the battery cell and determine the position of the battery cell in which an abnormality has occurred (S3100).

[0077] Thereafter, the processor 200 can select any one of the power supply modules for supplying the driving voltage among the plurality of battery modules 1000 (S3300). Here, the power supply module may be the battery module that is farthest away from the battery cell in which an abnormality has occurred.

[0078] At this time, when there are a plurality of battery modules that are farthest away from the battery cell in which an abnormality has occurred, the processor 200 can compare the state of charge (SOC) or state of health (SOH) of the battery modules located at the same distance and select the battery module with a larger SOC value or a smaller SOH value as the power supply module. At this time, the state of charge (SOC) of the battery module represents the current charged state of the battery as a percentage [%], and the state of health (SOH) of the battery module may represent the current degradation state of the battery as a percentage [%].

[0079] On the other hand, when a battery module with the same SOC value or SOH value occurs, the processor 200 can select, as the power supply module, the battery module that is connected closer to the negative electrode side among the plurality of battery modules 1000.

[0080] Thereafter, the processor 200 can send a switch control signal to the battery power control device 5000 in order to control the switch connected to the power supply module to a closed state (S3500).

[0081] The processor 200 can operate the battery protection device 3000 to cut off the charge and discharge circuit of the battery (S5000). However, without being limited to what has been described, steps S3000 and S5000 can be performed simultaneously.

[0082] On the other hand, when the charge rate (SOC) of the power supply module drops below the threshold value during operation in the monitoring mode, the processor 200 can send a control signal to the battery power control device 5000 to control a specific switch in the battery power control device 5000 connected to the power supply module to an open state.

[0083] Thereafter, the processor 200 re-executes step S3300 to re-select, as the power supply module, any one of the battery modules having a charge rate equal to or higher than the threshold value among the battery modules excluding the battery module including the battery cell in which the above abnormality has occurred, so that power can be applied for continuously monitoring the state of the battery.

[0084] As described above, the battery management device and method according to the embodiments of the present invention have been described.

[0085] A battery management device and method for performing battery state monitoring in conjunction with a battery protection device connected to one or more battery modules according to an embodiment of the present invention monitors a plurality of battery cells included in one or more battery modules. When an abnormality occurs in one or more of the plurality of battery cells, one of the battery modules excluding the battery module including the battery cell in which the abnormality has occurred is selected as a power supply module, and a control signal is transmitted to a battery power control device connected to the plurality of battery modules to connect the selected power supply module and the battery protection device. By obtaining the state data of the battery cell in which the abnormality has occurred while being supplied with power from the battery protection device connected to the power supply module, continuous state monitoring of the battery in which the abnormality has occurred can be performed using the normally charged battery voltage even when the charge and discharge circuit is cut off for battery protection. It is possible to provide a highly efficient, low-cost, and highly reliable battery management device and method capable of ensuring state data for analyzing abnormal batteries without separately providing an external power supply line.

[0086] The operation of the method according to an embodiment of the present invention can be embodied as a computer-readable program or code on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Also, the computer-readable recording medium can be distributed to a computer system connected by a network and stored and executed in a distributed manner with a computer-readable program or code.

[0087] In addition, a computer-readable recording medium can include a hardware device specially configured to store and execute program instructions, such as a read-only memory (ROM), a random-access memory (RAM), a flash memory, etc. The program instructions can include not only machine language code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

[0088] Some aspects of the present invention have been described in the context of an apparatus, which can also be illustrated by a corresponding method, where a block or apparatus corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method can be illustrated by corresponding blocks or items or features of a corresponding apparatus. Some or all of the method steps can be performed (or used) by a hardware device such as a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, one or more of the most important method steps can be performed by such a device.

[0089] Although the preferred embodiments of the present invention have been described above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the present invention described in the following claims.

Description of Reference Numerals

[0090] 1000: Battery 3000: Battery protection device 5000: Battery power control device 7000: Battery management device 100: Memory

Claims

A battery management device that performs battery state monitoring in conjunction with a battery protection device connected to a plurality of battery modules, comprising: a memory; and a processor that executes at least one instruction in the memory, wherein the at least one instruction includes: an instruction to monitor a plurality of battery cells included in the plurality of battery modules; an instruction to select one of the battery modules excluding the battery module including the battery cell in which an abnormality has occurred as a power supply module when an abnormality occurs in one or more of the plurality of battery cells; an instruction to transmit a control signal to a battery power control device connected to the plurality of battery modules to connect the selected power supply module and the battery protection device; and an instruction to receive state data of the battery cell in which an abnormality has occurred, supplied with power from the battery protection device connected to the power supply module, the battery management device. **Claim 2** The instruction to select one of the battery modules as a power supply module includes: an instruction to confirm the position of the battery cell in which an abnormality has occurred; and an instruction to select, as the power supply module, the battery module that is farthest away from the module including the battery cell in which the abnormality has occurred, the battery management device according to claim 1. **Claim 3** In the instruction to select, as the power supply module, the battery module that is farthest away from the module including the battery cell in which an abnormality has occurred: when there are a plurality of any one battery modules that are farthest away from the battery cell in which the abnormality has occurred, the battery management device according to claim 2, selecting the power supply module by comparing the charge rate (State of Charge, SOC) or the life (State of Health, SOH) of the battery modules. **Claim 4** When the plurality of battery modules include a first battery module and a second battery module in which at least one of the SOC or SOH values is the same, the battery management device according to claim 3, selecting the battery module that is closer to the negative electrode side among the first battery module and the second battery module as the power supply module. **Claim 5** The battery power control device: receives the control signal from the battery management device; The battery management device according to claim 1, wherein a switch corresponding to the selected power supply module among a plurality of switches in the battery power control device is closed to connect the power supply module and the battery protection device.

6. The at least one instruction is When the charging voltage of the power supply module drops below a threshold value, the instruction further includes reselecting, as the power supply module, a battery module having a charging rate equal to or higher than the threshold value among the battery modules excluding the battery module including the battery cell in which the abnormality has occurred. The battery management device according to claim 5.

7. A battery management method for performing battery state monitoring in conjunction with a battery protection device connected to a plurality of battery modules, comprising: monitoring a plurality of battery cells included in the plurality of battery modules; when an abnormality occurs in one or more of the plurality of battery cells, selecting, as a power supply module, one battery module among the battery modules excluding the battery module including the battery cell in which the abnormality has occurred; transmitting a control signal to a battery power control device connected to the plurality of battery modules to connect the selected power supply module and the battery protection device; and obtaining state data of the battery cell in which the abnormality has occurred by being supplied with power from the battery protection device connected to the power supply module. The battery management method.

8. The step of selecting the one battery module as the power supply module includes confirming the position of the battery cell in which the abnormality has occurred; and selecting, as the power supply module, the battery module that is farthest away from the module including the battery cell in which the abnormality has occurred. The battery management method according to claim 7.

9. In the step of selecting, as the power supply module, the battery module that is farthest away from the module including the battery cell in which the abnormality has occurred, when there are a plurality of battery modules that are farthest away from the battery cell in which the abnormality has occurred, the power supply module is selected by comparing the state of charge (SOC) or state of health (SOH) of the battery modules. The battery management method according to claim 8.

10. When the plurality of battery modules include a first battery module and a second battery module in which at least one of the SOC or SOH values is the same, the battery module that is closer to the negative electrode side among the first battery module and the second battery module is selected as the power supply module. The battery management method according to claim 8.

11. The battery power control device receives the control signal from the battery management device, and connects the power supply module and the battery protection device by closing (Closed) the switch corresponding to the selected power supply module among the plurality of switches in the battery power control device. The battery management method according to claim 7.

12. When the charging voltage charged in the power supply module drops below a threshold value, further includes a step of reselecting any one of the battery modules having a charging rate equal to or higher than the threshold value among the battery modules excluding the battery module including the battery cell in which the abnormality has occurred as the power supply module. The battery management method according to claim 11.

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