Battery management apparatus and method thereof

Abstract

A battery management device according to one embodiment disclosed in this document may include a detection unit that detects an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage, and a control unit that manages power supply from the battery cell to a load based on whether the oscillation operation is detected.

Description

Technology Field

[0001] The embodiments disclosed in this document relate to a battery management device and method. Background Technology

[0002] Secondary batteries are generally utilized as battery packs comprising battery modules in which multiple battery cells are connected in series and / or parallel. The state and operation of the battery pack are managed and controlled by a battery management system. Typically, in an electric vehicle equipped with such a battery pack, if the voltage of a battery cell measured by the battery management system (BMS) decreases during driving and reaches a diagnostic threshold for a cell voltage low warning, the discharge power supplied from the battery pack to the vehicle is limited.

[0003] When power derating is applied to the vehicle, the magnitude of the discharge current decreases, causing the battery cell voltage measured by the battery management system to increase again. If the measured battery cell voltage reaches the diagnostic threshold for unlocking above low voltage, the power supplied to the vehicle is no longer derated, and discharge is performed at the original power level.

[0004] In this manner, if a vehicle is driven until the battery cell voltage reaches a diagnostic threshold above low voltage or until charging of the battery pack begins, the power supplied to the vehicle is repeatedly limited and released, causing voltage oscillation. This results in repeated acceleration and deceleration noticeable to the driver, which can cause inconvenience and lead to power waste. The problem to be solved

[0005] The embodiments disclosed in this document aim to provide a battery management device and method that can delay the time it takes to reach a low voltage or higher of a battery cell by controlling it to maintain a power limiting state when voltage fluctuations occur in the battery cell, and can minimize the inconvenience felt by the user as the vehicle repeatedly accelerates and decelerates.

[0006] The technical problems of the embodiments disclosed in this document are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0007] A battery management device according to one embodiment disclosed in this document may include a detection unit that detects an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage, and a control unit that manages power supply from the battery cell to a load based on whether the oscillation operation is detected.

[0008] According to one embodiment, the control unit may limit the power supply from the battery cell to the load when the oscillation operation is detected by the detection unit.

[0009] According to one embodiment, when the oscillation operation is detected by the detection unit, the control unit may reduce the power supplied from the battery cell to the load to below a threshold value.

[0010] According to one embodiment, the detection unit can detect that the oscillation operation has occurred if the phenomenon of the voltage of the battery cell decreasing and increasing based on the threshold voltage is repeated more than a reference number of times during a preset time.

[0011] According to one embodiment, the detection unit may detect that the oscillation operation has occurred when the phenomenon in which the voltage of the battery cell is maintained at a state of being lower than the threshold voltage for a first reference time and then the voltage of the battery cell is maintained at a state of being higher than the threshold voltage for a second reference time occurs repeatedly.

[0012] According to one embodiment, the detection unit can detect that the oscillation operation has occurred when the voltage of the battery cell decreases below a first threshold voltage and then increases above a second threshold voltage that is different from the first threshold voltage.

[0013] According to one embodiment, the detection unit may diagnose a low voltage abnormality when the voltage of the battery cell decreases below the threshold voltage, and determine that the low voltage abnormality is released when the voltage of the battery cell increases above the threshold voltage.

[0014] According to one embodiment, the control unit may reduce the power supplied from the battery cell to the load to a value below a reference value when the voltage of the battery cell decreases to a value below a threshold voltage, and increase the power supplied from the battery cell to the load to a value above the threshold voltage.

[0015] According to one embodiment, the control unit may limit the power until the battery management system (BMS) managing the battery cell is turned off.

[0016] According to one embodiment, the detection unit can detect the oscillation operation based on the voltage of the battery cell with the lowest voltage among a plurality of battery cells.

[0017] A battery management method according to one embodiment disclosed in this document may include the step of detecting an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage, and the step of managing power supply from the battery cell to a load based on whether the oscillation operation is detected.

[0018] According to one embodiment, the step of managing power supply from the battery cell to the load may limit power supply from the battery cell to the load when the oscillation operation is detected.

[0019] According to one embodiment, the step of managing power supply from the battery cell to the load may reduce the power supplied from the battery cell to the load to below a threshold when the oscillation operation is detected.

[0020] According to one embodiment, the step of detecting the oscillation operation may detect that the oscillation operation has occurred when the phenomenon of the voltage of the battery cell decreasing and increasing based on the threshold voltage is repeated more than a reference number of times during a preset time. Effects of the invention

[0021] A battery management device and method according to one embodiment disclosed in this document can delay the time it takes to reach a low voltage or higher of a battery cell by controlling to maintain a power limiting state when voltage fluctuations of a battery cell occur, and can minimize the inconvenience felt by the user as the vehicle repeatedly accelerates and decelerates. Brief explanation of the drawing

[0022] FIG. 1 is a drawing for explaining the operation of a battery management device and a vehicle according to one embodiment disclosed in this document. FIG. 2 is a block diagram showing the configuration of a battery management device according to one embodiment disclosed in this document. FIG. 3 is a drawing for explaining the operation of a battery management device according to one embodiment disclosed in this document. FIG. 4 is a flowchart illustrating a battery management method according to one embodiment disclosed in this document. FIG. 5 is a block diagram showing the hardware configuration of a computing system for performing a battery management method according to one embodiment disclosed in this document. Specific details for implementing the invention

[0023] Hereinafter, various embodiments disclosed in this document will be described in detail with reference to the attached drawings. In this document, the same reference numerals are used for identical components in the drawings, and redundant descriptions of identical components are omitted.

[0024] With respect to the various embodiments disclosed in this document, specific structural or functional descriptions are provided merely for the purpose of explaining the embodiments, and the various embodiments disclosed in this document may be implemented in various forms and should not be interpreted as being limited to the embodiments described in this document.

[0025] Expressions such as "first," "second," "first," or "second" used in various embodiments may modify various components regardless of order and / or importance and do not limit said components. For example, without departing from the scope of the embodiments disclosed herein, the first component may be named the second component, and similarly, the second component may be renamed the first component.

[0026] The terms used in this document are used merely to describe specific embodiments and are not intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

[0027] All terms used herein, including technical or scientific terms, may have the same meaning as generally understood by those skilled in the art of the embodiments disclosed herein. Terms defined in commonly used dictionaries may be interpreted as having the same or similar meaning as they have in the context of the relevant technology and are not to be interpreted in an ideal or overly formal sense unless explicitly defined in this document. In some cases, even terms defined in this document shall not be interpreted to exclude the embodiments disclosed herein.

[0028] FIG. 1 is a drawing for explaining the operation of a battery management device and a vehicle according to one embodiment disclosed in this document.

[0029] Referring to FIG. 1, a battery pack (10) and a vehicle (20) are schematically shown operating, including a battery data management device (100) according to one embodiment disclosed in this document. As shown in FIG. 1, the battery pack (10) may include a plurality of battery modules (12), a sensor (14), a switching unit (16), and a battery management device (BMS) (100). At this time, the battery pack (10) may be equipped with a plurality of battery modules (12), sensors (14), switching units (16), and battery management devices (100).

[0030] A plurality of battery modules (12) may include one or more rechargeable battery cells. In this case, the plurality of battery modules (12) may be connected in series or in parallel.

[0031] The sensor (14) can detect the current flowing through the battery pack (10). At this time, the current detection signal can be transmitted to the battery management device (100).

[0032] The switching unit (16) can be connected in series to the (+) terminal side or the (-) terminal side of the battery module (12) to control the flow of the charging and discharging current of the battery module (12). For example, depending on the specifications of the battery pack (10), at least one switch, relay, magnetic contactor, etc. may be used as the switching unit (16).

[0033] The battery management device (100) can monitor the voltage, current, temperature, etc. of the battery pack (10) to control and manage it so as to prevent overcharging and over-discharging, etc., and for example, the battery management device (100) may be a pack BMS.

[0034] The battery management device (100) is an interface that receives values ​​of various measured parameters and may include a plurality of terminals and a circuit connected to these terminals to perform processing of the received values. Additionally, the battery management device (100) may control the ON / OFF of a switching unit (16), such as a switch, relay, or contactor, and may be connected to a plurality of battery modules (12) to monitor the status of the battery cells.

[0035] Meanwhile, the battery management device (100) disclosed in this document measures the voltage of battery cells included in a plurality of battery modules (12), and when the voltage of the battery cells decreases and reaches a diagnostic threshold, it can limit the discharge power supplied to the vehicle (20). In this case, the magnitude of the current applied from the battery pack (10) to the vehicle (20) is reduced, and the voltage of the battery cells can increase again. If the voltage of the battery cells reaches a diagnostic release threshold again, the battery management device (100) can supply power to the vehicle (20) at an initial power value without further limiting the discharge power.

[0036] In particular, the battery management device (100) can detect an oscillation operation in which the voltage of the battery cell repeatedly decreases and increases based on a threshold voltage. When such an oscillation operation is detected, the battery management device (100) can maintain a restricted state of power supplied to the vehicle (20) until the power is turned off. Therefore, as the restriction and release of power are repeated, the phenomenon of the vehicle (20) repeatedly accelerating and decelerating can be prevented.

[0037] FIG. 2 is a block diagram showing the configuration of a battery management device according to one embodiment disclosed in this document.

[0038] Referring to FIG. 2, a battery management device (100) according to one embodiment disclosed in this document may include a detection unit (110), a control unit (120), and an alarm unit (130).

[0039] The detection unit (110) can detect an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage. Specifically, the detection unit (110) can detect that an oscillation operation has occurred if the phenomenon of the voltage of a battery cell decreasing and increasing based on a set threshold voltage (e.g., any voltage between 2.5V and 2.7V) is repeated more than a reference number (e.g., 3 times) during a preset time (e.g., 62 seconds). For example, the detection unit (110) can detect an oscillation operation based on the voltage of the battery cell with the lowest voltage among a plurality of battery cells included in the battery pack.

[0040] Additionally, the detection unit (110) can detect that an oscillation operation has occurred if the state in which the voltage of the battery cell is reduced to a threshold voltage is maintained for a first reference time (e.g., 500 milliseconds), and then the voltage of the battery cell increases again to a state above the threshold voltage is maintained for a second reference time (e.g., 2 seconds), and this phenomenon occurs repeatedly.

[0041] And, the detection unit (110) can detect that an oscillation operation has occurred when the voltage of the battery cell decreases below a first threshold voltage (e.g., 2.5V) and then increases above a second threshold voltage (e.g., 2.7V) which is different from the first threshold voltage.

[0042] The detection unit (110) can diagnose a low cell voltage when the voltage of the battery cell decreases below a threshold voltage, and determine that the low cell voltage diagnosis is released when the voltage of the battery cell increases above the threshold voltage. In this case, the detection unit (110) can detect an oscillation operation by counting the number of diagnoses for the low cell voltage. That is, the detection unit (110) can determine that an oscillation operation has occurred when the number of diagnoses for the low cell voltage exceeds a reference number for a certain period of time, or when the number of releases for the low cell voltage diagnosis exceeds a reference number for a certain period of time.

[0043] The control unit (120) can manage the power supply from the battery cell to the load (e.g., vehicle) based on whether an oscillation operation is detected. Specifically, the control unit (120) can limit the power supply from the battery cell to the load when an oscillation operation is detected by the detection unit (110). At this time, when an oscillation operation is detected by the detection unit (110), the control unit (120) can reduce the power supplied from the battery cell to the load to below a threshold value. For example, when an oscillation operation is detected, the control unit (120) can reduce the power supplied to the vehicle to less than 15%.

[0044] Typically, when the voltage of the battery cell decreases below a threshold voltage (e.g., when a low voltage abnormality diagnosis is performed), the control unit (120) reduces the power supplied from the battery cell to the load to a value below a reference value to operate the battery pack in a power limiting mode, and when the voltage of the battery cell increases again above the threshold voltage (e.g., when a low voltage abnormality diagnosis is released), the power supplied from the battery cell to the load is increased again to an initial setting value to operate the battery pack in a normal mode.

[0045] In particular, in a battery management device (100) according to one embodiment disclosed in this document, the control unit (120) may maintain a power limiting mode of the battery pack when an oscillation operation occurs in which the voltage of the battery cell repeatedly decreases and increases based on a threshold voltage. At this time, the control unit (120) may limit the power until the battery management system (BMS) managing the battery cell is turned off.

[0046] The alarm unit (130) can provide various notifications when an event occurs in the battery pack or vehicle. For example, the alarm unit (130) can provide a notification to the user when it detects an oscillation operation of a battery cell. In addition, the alarm unit (130) can provide a notification to the user when a voltage abnormality occurs due to a decrease in the voltage of a battery cell. In this case, the alarm unit (130) can display a notification on a display (not shown) or provide an alarm through a speaker. In addition, the alarm unit (130) can send a notification message, etc., to the user's terminal whenever an event occurs.

[0047] In this way, the battery management device (100) according to one embodiment disclosed in this document can delay the time to reach a low voltage or higher of the battery cell by controlling to maintain a power limiting state when voltage fluctuations of the battery cell occur, and can minimize the inconvenience felt by the user as the vehicle repeatedly accelerates and decelerates.

[0048] FIG. 3 is a drawing for explaining the operation of a battery management device according to one embodiment disclosed in this document.

[0049] Referring to FIG. 3, graph (a) shows the voltage (V) of the battery cell over time (100 ms), graph (b) shows the number of diagnoses (#) of low voltage or higher over time, and graph (c) shows the change in power (%) from the battery cell to the load over time.

[0050] As shown in graph (a) of FIG. 3, in a battery management device (100) according to one embodiment disclosed in this document, when the voltage of a battery cell is measured through a voltage measurement circuit and the voltage of the battery cell decreases to less than a first threshold voltage (e.g., 2.499V in FIG. 3) (F1), the time during which the voltage of the battery cell remains below the first threshold voltage can be measured through a timer (F2).

[0051] If the voltage of the battery cell remains below the first threshold voltage for more than the first reference time (e.g., 500ms in FIG. 3), the detection unit (110) of the battery management device (100) may diagnose that a low voltage abnormality has occurred once (F4). Additionally, if a low voltage abnormality is detected, the control unit (120) of the battery management device (100) may limit the power supplied from the battery cell to the load from 100% to 15% (F5).

[0052] And, as power supply to the load is limited by the control unit (120), the voltage of the battery cell increases again and rises above the second threshold voltage (e.g., 2.7V in FIG. 3) (R1), the time during which the voltage of the battery cell is maintained above the second threshold voltage can be measured through a timer (R2).

[0053] If the voltage of the battery cell is above the second threshold voltage and a second reference time (e.g., 2s in FIG. 3) has elapsed, the detection unit (110) of the battery management device (100) can perform a diagnosis release for a voltage above the low voltage (R3). Additionally, when the diagnosis for a voltage above the low voltage is released, the control unit (120) of the battery management device (100) can change the power supplied from the battery cell to the load from 15% back to the initial value of 100% (R4).

[0054] In this way, the battery management device (100) disclosed in this document can monitor voltage changes of the battery cell based on a threshold voltage to determine the diagnosis and release of the battery cell's low voltage or higher. If the diagnosis and release of the battery cell's low voltage or higher occurs more than a reference number (e.g., 3 times in FIG. 3) during a preset time (e.g., 62s in FIG. 3), the battery management device (100) can determine that an oscillation operation has occurred. In this manner, when an oscillation operation is detected, the battery management device (100) disclosed in this document can maintain the power supplied from the battery cell to the load at 15% until the power is turned off. Therefore, user inconvenience caused by repeated power limiting and release can be reduced, and power can be used more efficiently.

[0055] Meanwhile, Figure 3 illustrates the first and second threshold voltages of the battery cell for diagnosing low voltage or higher, the first and second reference times, and the preset time and reference count for detecting oscillation operation, but the battery management device (100) according to one embodiment disclosed in this document is not limited to these values ​​only.

[0056] FIG. 4 is a flowchart illustrating a battery management method according to one embodiment disclosed in this document.

[0057] Referring to FIG. 4, a battery management method according to one embodiment disclosed in this document can first monitor changes in the voltage of a battery cell by measuring the voltage of the battery cell (S110). Then, to detect oscillation behavior of the battery cell, it is determined whether the decrease and increase of the battery cell voltage based on a threshold voltage has been repeated more than a reference number of times during a preset time (S120). For example, step S120 may be performed based on the voltage of the battery cell with the lowest voltage among a plurality of battery cells included in a battery pack. If the increase and decrease of the battery cell voltage based on the threshold voltage has occurred less than a reference number of times during a preset time (NO), the process returns to step S110.

[0058] Meanwhile, if the increase and decrease of the voltage of the battery cell based on the threshold voltage is repeated more than a reference number of times during a preset time (YES), it can be detected that an oscillation operation has occurred in the battery cell (S130). Additionally, in steps S120 and S130, if the state in which the voltage of the battery cell is reduced below the threshold voltage is maintained for a first reference time (e.g., 500 milliseconds), and then the voltage of the battery cell increases again to a state above the threshold voltage is maintained for a second reference time (e.g., 2 seconds), it can be detected that an oscillation operation has occurred.

[0059] In addition, in steps S120 and S130, if the voltage of the battery cell decreases below a first threshold voltage (e.g., 2.5V) and then increases above a second threshold voltage (e.g., 2.7V) which is different from the first threshold voltage, it can be detected that an oscillation operation has occurred.

[0060] For example, in steps S120 and S130, if the voltage of the battery cell decreases below a threshold voltage, it is diagnosed as an abnormal low voltage, and if the voltage of the battery cell increases above the threshold voltage, it is determined that the abnormal low voltage diagnosis is released. In this case, the number of diagnoses regarding the abnormal low voltage of the battery cell can be counted to detect oscillation operation. That is, it can be determined that oscillation operation has occurred if the number of diagnoses regarding the abnormal low voltage of the battery cell exceeds a reference number for a certain period of time, or if the number of releases regarding the abnormal low voltage of the battery cell exceeds a reference number for a certain period of time.

[0061] Next, if an oscillation operation is detected in step S130, the power supplied from the battery cell to the load can be limited (S140). At this time, in step S140, the power supplied from the battery cell to the load can be reduced to below a threshold value. For example, if an oscillation operation is detected, the power supplied to the vehicle can be reduced to less than 15%.

[0062] Typically, when the voltage of a battery cell decreases below a threshold voltage (e.g., when diagnosing an abnormal low voltage), the battery management device reduces the power supplied from the battery cell to the load to below a reference value to operate the battery pack in a power limiting mode, and when the voltage of the battery cell increases again above the threshold voltage (e.g., when diagnosing an abnormal low voltage), it increases the power supplied from the battery cell to the load back to an initial set value to operate the battery pack in a normal mode.

[0063] In particular, in a battery management method according to one embodiment disclosed in this document, when an oscillation operation occurs in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage, a power limiting mode of the battery pack can be maintained. At this time, power can be limited until the battery management system (BMS) managing the battery cell is turned off.

[0064] Meanwhile, although not shown in FIG. 4, a battery management method according to one embodiment disclosed in this document may further include the step of providing a notification to a user when an oscillation operation of a battery cell is detected. Additionally, a notification may be provided to a user when a voltage abnormality occurs due to a decrease in the voltage of the battery cell. At this time, a notification may be displayed on a display, an alarm may be provided through a speaker, or a notification message, etc., may be sent to the user's terminal whenever an event occurs.

[0065] As such, the battery management method according to one embodiment disclosed in this document can delay the time it takes to reach a low voltage or higher of the battery cell by controlling it to maintain a power limiting state when voltage fluctuations of the battery cell occur, and can minimize the inconvenience felt by the user as the vehicle repeatedly accelerates and decelerates.

[0066] FIG. 5 is a block diagram showing the hardware configuration of a computing system for performing a battery management method according to one embodiment disclosed in this document.

[0067] Referring to FIG. 5, a computing system (1000) according to one embodiment disclosed in this document may include an MCU (1010), a memory (1020), an input / output I / F (1030), and a communication I / F (1040).

[0068] The MCU (1010) may be a processor that executes various programs stored in memory (1020) (e.g., battery diagnostic program, oscillation detection program, power control program, etc.), processes various data including the voltage and transmission power of the battery cell through these programs, and performs the functions of the battery data management device shown in FIG. 2 above.

[0069] The memory (1020) can store various programs related to battery voltage measurement and diagnosis, power control, etc. Additionally, the memory (1020) can store various data such as the voltage of the battery cell and transmission power.

[0070] These memories (1020) may be provided in multiple quantities as needed. The memories (1020) may be volatile memories or non-volatile memories. As volatile memories, the memory (1020) may use RAM, DRAM, SRAM, etc. As non-volatile memories, the memory (1020) may use ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. The examples of the memories (1020) listed above are merely examples and are not limited to these examples.

[0071] The input / output I / F (1030) can provide an interface that enables data transmission and reception between an input device (not shown), such as a keyboard, mouse, or touch panel, an output device (not shown), and an MCU (1010).

[0072] The communication I / F (1040) is configured to transmit and receive various data to and from a server and may be various devices capable of supporting wired or wireless communication. For example, through the communication I / F (1040), programs for diagnosing oscillation operations and power control, or various data, can be transmitted and received from a separately provided external server.

[0073] In this way, a computer program according to one embodiment disclosed in this document may be implemented as a module that performs, for example, the functions illustrated in FIG. 2, by being written to memory (1020) and processed by an MCU (1010).

[0074] In the foregoing, although all components constituting the embodiments disclosed in this document have been described as being combined or operating in combination, the embodiments disclosed in this document are not necessarily limited to such embodiments. That is, within the scope of the purposes of the embodiments disclosed in this document, all components may be selectively combined in one or more ways to operate.

[0075] Furthermore, terms such as "include," "compose," or "have" as described above, unless specifically stated otherwise, mean that the relevant component may be inherent; thus, they should be interpreted as allowing for the inclusion of additional components rather than excluding them. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the embodiments disclosed in this document pertain, unless otherwise defined. Commonly used terms, such as those defined in advance, should be interpreted in accordance with their contextual meanings in the relevant technology and, unless explicitly defined in this document, should not be interpreted in an ideal or overly formal sense.

[0076] The foregoing description is merely an illustrative explanation of the technical concept disclosed in this document, and a person skilled in the art to which the embodiments disclosed in this document pertain can make various modifications and variations within the scope of the essential characteristics of the embodiments disclosed in this document. Accordingly, the embodiments disclosed in this document are intended to explain, not limit, the technical concept of the embodiments disclosed in this document, and the scope of the technical concept disclosed in this document is not limited by these embodiments. The scope of protection of the technical concept disclosed in this document shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of this document. Explanation of the symbols

[0077] 10: Battery pack 12: Multiple battery modules 14: Sensor 16: Switching unit 20: Vehicle 100: Battery Management Unit 110: Detector 120: Controller 130: Alarm unit 1000: Computing system 1010: MCU 1020: Memory 1030: I / O I / F 1040: Communication I / F

Claims

Claim 1 A battery management device comprising: a detection unit that detects an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a control unit that manages power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein the control unit limits power supply from the battery cell to the load when the oscillation operation is detected by the detection unit. Claim 2 delete Claim 3 A battery management device comprising: a detection unit that detects an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a control unit that manages power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein the control unit reduces the power supplied from the battery cell to the load to below a threshold value when the oscillation operation is detected by the detection unit. Claim 4 A battery management device comprising: a detection unit that detects an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a control unit that manages power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein the detection unit detects that the oscillation operation has occurred when the phenomenon in which the voltage of the battery cell decreases and increases based on the threshold voltage is repeated more than a reference number of times during a preset time. Claim 5 A battery management device comprising: a detection unit for detecting an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a control unit for managing power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein the detection unit detects that the oscillation operation has occurred when a phenomenon occurs in which the voltage of the battery cell is maintained in a state of being lower than the threshold voltage for a first reference time and then the voltage of the battery cell is maintained in a state of being higher than the threshold voltage for a second reference time. Claim 6 A battery management device comprising: a detection unit that detects an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a control unit that manages power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein the detection unit detects that the oscillation operation has occurred when the voltage of the battery cell repeatedly decreases to a level below a first threshold voltage and then increases to a level above a second threshold voltage that is different from the first threshold voltage. Claim 7 A battery management device according to claim 1, wherein the detection unit diagnoses a low voltage abnormality when the voltage of the battery cell decreases below the threshold voltage, and determines that the low voltage abnormality is released when the voltage of the battery cell increases above the threshold voltage. Claim 8 A battery management device comprising: a detection unit that detects an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a control unit that manages power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein the control unit reduces the power supplied from the battery cell to the load to a value below a reference value when the voltage of the battery cell decreases below the threshold voltage, and increases the power supplied from the battery cell to the load back to an initial set value when the voltage of the battery cell increases above the threshold voltage. Claim 9 A battery management device comprising: a detection unit that detects an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a control unit that manages power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein the control unit limits the power supply until a battery management system (BMS) managing the battery cell is turned off. Claim 10 A battery management device comprising: a detection unit that detects an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a control unit that manages power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein the detection unit detects the oscillation operation based on the voltage of the battery cell with the lowest voltage among a plurality of battery cells. Claim 11 A battery management method comprising: a step of detecting an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a step of managing power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein the step of managing power supply from the battery cell to the load limits power supply from the battery cell to the load when the oscillation operation is detected. Claim 12 delete Claim 13 A battery management method comprising: a step of detecting an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a step of managing power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein, when the oscillation operation is detected, the step of managing power supply from the battery cell to the load reduces the power supplied from the battery cell to the load to below a threshold value. Claim 14 A battery management method comprising: a step of detecting an oscillation operation in which the voltage of a battery cell repeatedly decreases and increases based on a threshold voltage; and a step of managing power supply from the battery cell to a load based on whether the oscillation operation is detected, wherein the step of detecting the oscillation operation detects that the oscillation operation has occurred when the phenomenon in which the voltage of the battery cell decreases and increases based on the threshold voltage is repeated more than a reference number of times during a preset time.

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