Battery pack and method of operating the same

Abstract

A battery pack is provided, including: a battery cell; a battery management device connected to the battery cell through a first line and a second line; a detection unit configured to detect a current of a third line connecting the first line and the second line; and a determination unit configured to determine whether disconnection of the first line occurs based on whether the current of the third line is detected.

Description

Technical Field

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2021-0129269, filed on September 29, 2021, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0004] The embodiments disclosed herein relate to a battery pack and its operating method. Background Technology

[0005] In recent years, research and development of rechargeable batteries have been actively pursued. Here, rechargeable batteries, as rechargeable / dischargeable batteries, can include all traditional nickel (Ni) / cadmium (Cd) batteries, nickel / metal hydride (MH) batteries, and more recently, lithium-ion batteries. Among rechargeable batteries, lithium-ion batteries have a significantly higher energy density compared to traditional nickel-cadmium and nickel-metal hydride batteries. Furthermore, lithium-ion batteries can be manufactured to be small and lightweight, thus they have already been used as power sources for mobile devices, and in recent years, their application has expanded to power electric vehicles, thus attracting attention as a next-generation energy storage medium.

[0006] In battery management devices, to accurately measure the voltage of individual battery cells, the circuitry for receiving power from the battery and the voltage sensing circuitry for each individual cell are separate. During operation, if the circuitry for receiving power from the battery is disconnected, the battery management device stops operating, potentially halting the use of the entire battery pack. Therefore, battery management devices can be designed to receive power through alternative circuitry even when the power supply line is disconnected. Summary of the Invention

[0007] [Technical Issues]

[0008] The embodiments disclosed herein are intended to provide a battery pack and a method of operating the same, wherein a disconnection of a line used to supply power from a battery to a battery management device can be sensed.

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

[0010] [Technical Solution]

[0011] A battery pack according to an embodiment disclosed herein includes: a battery cell; a battery management device connected to the battery cell via a first line and a second line; a detection unit configured to detect current in a third line connecting the first line and the second line; and a determination unit configured to determine whether a disconnection of the first line has occurred based on whether current in the third line is detected.

[0012] In one embodiment, the detection unit may include an optocoupler, and a diode included in the optocoupler is connected to a third line.

[0013] In one embodiment, the determining unit may be further configured to determine that the first line is disconnected when current flows through the optocoupler.

[0014] In one embodiment, the determining unit may include a microcontroller unit (MCU).

[0015] In one embodiment, the battery management device may be further configured to receive power via a first line and, when the first line is disconnected, to receive power via a third line.

[0016] In one embodiment, the resistor can be connected to both the first and second lines.

[0017] In one embodiment, the first line may be a first power supply line, the second line may be a voltage sensing line, and the third line may be a second power supply line.

[0018] In one embodiment, the first line may be the first ground line of the battery management device, the second line may be the voltage sensing line of the battery cell, and the third line may be the second ground line of the battery management device.

[0019] In one embodiment, multiple battery cells can be provided, and the second line can be the voltage sensing line of the bottommost battery cell among the multiple battery cells.

[0020] In one embodiment, multiple battery cells can be provided, and the second line can be the voltage sensing line of the uppermost battery cell among the multiple battery cells.

[0021] The battery pack operation method according to the embodiments disclosed herein includes: detecting the current in a third line that connects a first line and a second line, the first line and the second line connecting a battery cell to a battery management device; and determining whether a disconnection of the first line has occurred based on the detected current in the third line, wherein the battery management device receives power through the first line and receives power through the third line when the first line is disconnected.

[0022] In one embodiment, determining whether a first line disconnection has occurred based on the detected current in the third line may include: determining whether current flows through the optocoupler; and determining that a first line disconnection has occurred when it is determined that current flows through the optocoupler.

[0023] In one embodiment, multiple battery cells can be provided, and the second line can be the voltage sensing line of the uppermost battery cell among the multiple battery cells.

[0024] [Beneficial Effects]

[0025] According to the embodiments disclosed herein, the battery pack and its operation method can determine the disconnection of the power supply line of the battery management device by detecting the current flowing to the line used to supply power from the voltage sensing line of the topmost battery cell to the battery management device.

[0026] The battery pack and its operating method according to the embodiments disclosed herein can perform management that prevents the use of the battery pack from being stopped even when the line for supplying power to the battery management device is disconnected.

[0027] Compared to techniques used to determine the disconnection of a line supplying power to a battery management device by sensing the voltage drop of the topmost battery cell, the battery pack and its operation method according to embodiments disclosed herein can determine the disconnection more accurately.

[0028] In addition, various effects that can be directly or indirectly known from this disclosure may be provided. Attached Figure Description

[0029] Figure 1 A battery pack according to an embodiment disclosed herein is shown.

[0030] Figure 2 This is a schematic diagram illustrating a battery pack according to an embodiment disclosed herein.

[0031] Figure 3 This is a block diagram illustrating in detail the battery pack according to embodiments disclosed herein.

[0032] Figure 4 This is a schematic diagram illustrating a battery pack according to another embodiment disclosed herein.

[0033] Figure 5 This is a flowchart illustrating a method of operating a battery pack according to an embodiment disclosed herein.

[0034] Figure 6 This is a flowchart illustrating in more detail a method of operating a battery pack according to embodiments disclosed herein.

[0035] Figure 7This is a block diagram illustrating the hardware configuration of a computing system for performing a battery pack control method according to embodiments disclosed herein. Detailed Implementation

[0036] The embodiments disclosed herein are described in detail below with reference to the exemplary accompanying drawings. When assigning reference numerals to components in each drawing, it should be noted that the same components are given the same reference numerals even when indicated in different drawings. Furthermore, in describing the embodiments disclosed herein, detailed descriptions of related known configurations or functions will be omitted if it is determined that such detailed descriptions interfere with the understanding of the embodiments disclosed herein.

[0037] To describe the components of the embodiments disclosed herein, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are used only to distinguish one component from another and are not intended to limit the components to their nature, sequence, order, etc. The terms used herein, including technical and scientific terms, have the same meaning as commonly understood by those skilled in the art, provided that no different definitions are provided. Generally, terms defined in a general dictionary should be interpreted as having the same meaning as in the context of the prior art and should not be interpreted as having an ideal or exaggerated meaning unless explicitly defined herein.

[0038] Figure 1 A battery pack according to an embodiment disclosed herein is shown.

[0039] refer to Figure 1 The battery pack 100 according to the embodiments disclosed herein may include a sensor 101, a switching unit 102, a battery module 110, and a battery management device 120. In one embodiment, the battery pack 100 may include a plurality of sensors 101, switching units 102, battery modules 110, and battery management devices 120 arranged in a plurality of configurations.

[0040] Battery module 110 may include one or more rechargeable / dischargeable battery cells. Battery module 110 may include a plurality of battery cells 111 and 112. For example, battery module 110 may include n battery cells (n is a natural number greater than or equal to 2). Battery module 110 may supply power to a target device (not shown). For this purpose, battery module 110 may be electrically connected to the target device. Here, the target device may include an electrical, electronic, or mechanical device that operates by receiving power from battery pack 100 (which includes a plurality of battery cells 111 and 112).

[0041] The multiple battery cells 111 and 112 can be lithium-ion (Li-ion) batteries, lithium-ion polymer batteries, nickel-cadmium (Ni-Cd) batteries, nickel-metal hydride (Ni-MH) batteries, etc., and are not limited to these. Meanwhile, although in Figure 1The diagram shows one battery module 110, but according to an embodiment, the battery module 110 can be configured as a plurality of battery modules, and the plurality of battery modules can be connected in series or in parallel.

[0042] Sensor 101 can detect the current flowing in battery pack 100. In this case, the signal of the detected current can be transmitted to battery management device 120.

[0043] Relay 102 can be connected in series to either the (+) or (-) terminal side of battery module 110 to control the charging / discharging current of battery module 110. For example, according to the specifications of battery pack 100, relay 102 can be at least one relay, magnetic contactor, etc.

[0044] The battery management device 120 can monitor the voltage, current, temperature, etc. of the battery pack 100 to perform control and management to prevent overcharging and over-discharging, and may include, for example, a BMS.

[0045] As an interface for receiving measured values ​​of various parameters, the battery management device 120 may include multiple terminals and circuitry connected to the terminals to process the received values. The battery management device 120 can control the on / off state of the relay 102 and can be connected to the battery module 110 to monitor the status of the battery module 110.

[0046] The battery management device 120 can manage and / or control the state and / or operation of the battery module 110. For example, the battery management device 120 can manage and / or control the state and / or operation of multiple battery cells 111 and 112 included in the battery module 110. The battery management device 120 can manage the charging and / or discharging of the battery module 110.

[0047] Furthermore, the battery management device 120 can monitor the voltage, current, temperature, insulation resistance, etc. of each of the battery cells 111 and 112 included in the battery pack 100. Sensors or various measurement modules (not shown) for monitoring performed by the battery management device 120 can be additionally mounted in the charging / discharging path, at any location of the battery module 110, etc. The battery management device 120 can calculate parameters indicating the state of the battery module 110 (e.g., state of charge (SoC), state of health (SoH), etc.) based on measurements such as monitored voltage, current, temperature, etc.

[0048] Figure 2 This is a block diagram illustrating a battery pack according to an embodiment disclosed herein.

[0049] refer to Figure 2The battery pack 100 according to embodiments disclosed herein may include a battery module 111, a battery management device 120, a detection unit 130, and a determination unit 140. In one embodiment, the battery pack 100 may be connected to... Figure 1 The battery pack 100 is basically the same as the battery cell 111, which can be included in the battery pack 100. Figure 1 In the battery module 110, and the battery management device 120 can be connected to... Figure 1 The battery management device 110 is basically the same.

[0050] Battery cell 111 may include Figure 1 In the battery module 110. For example, the battery module 110 may include multiple battery cells.

[0051] The battery management device 120 can be connected to the battery cell 111 via a first line 10 and a second line 20. For example, the first line 10 can be a power supply line for the battery management device 120. In another example, the second line 20 can be a voltage sensing line for the battery cell 111. That is, power can be supplied from the battery module 110 to the battery management device 120 via the first line 10. In one embodiment, the battery management device 120 can operate using the power supplied from the battery module 110 via the first line 10, and when the first line 10 is disconnected, the battery management device 120 may not be able to receive power from the battery module 110 via the first line 10.

[0052] The detection unit 130 can detect the current in the third line 30 that connects the first line 10 to the second line 20. For example, the third line 30 can be a line that supplies power to the battery management device 120 when the first line 10 is disconnected. In another example, the third line 30 can be a second power supply line. In one embodiment, the detection unit 130 can be connected to the third line 30.

[0053] The determining unit 140 can determine whether a break in the first line 10 has occurred based on the current in the third line 30 detected by the detection unit 130. For example, when current is detected flowing through the third line 30, the determining unit 140 can determine that a break has occurred in the first line 10. In another example, when it is determined that no current flows through the third line 30, the determining unit 140 can determine that no break has occurred in the first line 10.

[0054] In one embodiment, battery cell 111 may be the uppermost battery cell among a plurality of battery cells included in battery module 110 (see [link]). Figure 1In this case, the first line 120 may be a line for supplying power from the battery module 110 to the battery management device 120, the second line 20 may be a line for sensing the voltage of the uppermost battery cell, and the third line 30 may be a line for supplying power to the battery management device 120 when the first line 10 is disconnected.

[0055] According to the embodiments disclosed herein, the battery pack 100 can determine whether the first line 10, which is a line for supplying power to the battery management device 120, is disconnected by detecting whether current flows through the third line 30. Therefore, compared to a method that determines the disconnection of the first line 10 based on a decrease in the sensed voltage of the uppermost battery cell 111 when the first line 10 is disconnected, the battery pack 100 can determine the disconnection of the first line 10 more accurately. Furthermore, in the battery pack 100, the determining unit 140 can determine the disconnection of the first line 10 based on the detection by the detection unit 130 of whether current flows through the third line 30, thereby more accurately detecting the disconnection of the line for supplying power to the battery management device 120 and effectively managing the battery pack 100.

[0056] Figure 3 This is a block diagram illustrating in detail the battery pack according to embodiments disclosed herein.

[0057] refer to Figure 3 Battery module 110 (see Figure 1 The battery cell 111 may include multiple battery cells 111 and 112. For example, the topmost battery cell 111 and another battery cell 112 may be connected in series. In one embodiment, the topmost battery cell 111 may be connected to... Figure 2 The battery cells are basically the same as those of the 111 type.

[0058] The battery management device 120 can be connected to the uppermost battery cell 111 via a first line 10 and a second line 20. For example, the first line 10 can be a line for supplying power to the battery management device 120, while the second line 20 can be a line for sensing the voltage of the uppermost battery cell 111. In another example, a resistor can be connected to the first line 10 and the second line 20. In one embodiment, the resistor can be connected to a line for connecting another battery cell 112 to the battery management device 120.

[0059] The first line 10 and the second line 20 can be connected by a third line 30. For example, the third line 30 can be a line used to supply power to the battery management device 120 when the first line 10 is disconnected.

[0060] The detection unit 130 can detect the current in the third line 30. For example, the detection unit 130 may include an optocoupler, and a diode included in the optocoupler may be connected to the third line 30. That is, the detection unit 130 can detect the current flowing through the optocoupler through the third line 30. For example, when current flows through the third line 30, the diode connected to the third line can generate light, and when the light generated in the diode is detected, current can flow through the optocoupler.

[0061] The determining unit 140 can determine whether the first line 10 has been disconnected based on the current in the third line 30 detected by the detection unit 130. For example, when current flows through the optocoupler included in the detection unit 130, the determining unit 140 can determine that the first line 10 is disconnected. That is, when the first line 10 is disconnected, the battery management device 120 can receive power through the third line 30, and in this case, current can flow through the optocoupler, and the determining unit 140 can determine that the first line 10 is disconnected by detecting the current flowing through the optocoupler.

[0062] In one embodiment, determining unit 140 may include a microcontroller unit (MCU). The MCU can determine whether current flows through the optocoupler. For example, when current flows through the optocoupler, a voltage drop from the reference voltage may occur, and the MCU can detect current flowing through the optocoupler by detecting the voltage drop. In another example, when no current flows through the optocoupler, no voltage drop from the reference voltage may occur, and the MCU can detect that no current flows through the optocoupler. When current is detected flowing through the optocoupler, the MCU can determine that the first line 10 is open, and when no current is detected flowing through the optocoupler, the MCU can determine that the first line 10 is not open.

[0063] In one embodiment, when it is determined that the first line 10 is disconnected, the MCU can output information about the disconnection of the first line 10 to the user. Therefore, the battery pack 100 can manage the power supply lines of the battery management device 120.

[0064] In one embodiment, the determining unit 140 may include an ASIC GPIO.

[0065] In one embodiment, the determining unit 140 may be included in the battery management device 120. For example, the battery management device 120 may determine whether the first line 10 is disconnected. In another example, when it is determined that the first line 10 is disconnected, the battery management device 120 may transmit information about the disconnection of the first line 10 to a higher-level controller (not shown).

[0066] Figure 4This is a schematic diagram illustrating a battery pack according to another embodiment disclosed herein.

[0067] refer to Figure 4 According to another embodiment disclosed herein, the battery pack 200 may include a plurality of battery cells 211 and 212, a battery management device 220, a detection unit 230, and a determination unit 240. In one embodiment, the battery management device 220 may be connected to... Figure 2 The battery management device 120 is basically the same.

[0068] Battery module 110 (see Figure 1 The battery cell 211 may include multiple battery cells 211 and 212. For example, the bottom battery cell 211 and another battery cell 212 may be connected in series. In one embodiment, the bottom battery cell 211 may be connected to... Figure 2 The battery cells are basically the same as those of the 111 type.

[0069] The battery management device 220 can be connected to the lowest battery cell 211 via a first line 40 and a second line 50. For example, the first line 40 can be a line connected to ground of the battery management device 220, while the second line 50 can be a line for sensing the voltage of the lowest battery cell 211. In one embodiment, the second line 50 can be a line connected to the negative terminal of the lowest battery cell 211 for sensing the voltage of the lowest battery cell 211. In one embodiment, a resistor can be connected to the first line 40 and the second line 50. In one embodiment, a resistor can be connected to a line for connecting another battery cell 212 to the battery management device 220.

[0070] The first line 40 and the second line 50 can be connected by a third line 60. For example, the third line 60 can be a line connected to the ground of the battery management device 220 when the first line 40 is disconnected. In one embodiment, the first line 40 can be the first ground line of the battery management device 220, the second line 50 can be the voltage sensing line of the bottommost battery cell 211, and the third line 60 can be the second ground line of the battery management device 220.

[0071] The detection unit 230 can detect the current in the third line 60. For example, the detection unit 230 may include an optocoupler, and a diode included in the optocoupler may be connected to the third line 60. That is, the detection unit 230 can detect the current flowing through the optocoupler through the third line 60. For example, when current flows through the third line 60, the diode connected to the third line 60 can generate light, and when the light generated in the diode is detected, current can flow through the optocoupler.

[0072] The determining unit 240 can determine whether the first line 40 has been disconnected based on the current in the third line 60 detected by the detection unit 230. For example, when current flows through the optocoupler included in the detection unit 230, the determining unit 240 can determine that the first line 40 is disconnected.

[0073] In one embodiment, determining unit 240 may include an MCU. The MCU can determine whether current flows through the optocoupler. For example, when current flows through the optocoupler, a voltage drop from the reference voltage may occur, and the MCU can detect current flowing through the optocoupler by detecting the voltage drop. In another example, when no current flows through the optocoupler, no voltage drop from the reference voltage may occur, and the MCU can detect that no current flows through the optocoupler. When current is detected flowing through the optocoupler, the MCU can determine that the first line 40 is open, and when no current is detected flowing through the optocoupler, the MCU can determine that the first line 40 is not open.

[0074] In one embodiment, when it is determined that the first line 40 is disconnected, the MCU can output information about the disconnection of the first line 40 to the user. Therefore, the battery pack 200 can manage the grounding line of the battery management device 220.

[0075] In one embodiment, the determining unit 240 may include an ASIC GPIO.

[0076] In one embodiment, the determining unit 240 may be included in the battery management device 220. For example, the battery management device 220 may determine whether the first line 40 is disconnected. In another example, when it is determined that the first line 40 is disconnected, the battery management device 220 may transmit information about the disconnection of the first line 40 to a higher-level controller (not shown).

[0077] Although Figure 3 and Figure 4 Although not shown, the battery pack according to embodiments disclosed herein can simultaneously determine the disconnection of the power supply line and the ground line of the battery management device. For example, the battery pack according to embodiments may include... Figure 3 and Figure 4 The components shown.

[0078] Figure 5 This is a flowchart illustrating a method of operating a battery pack according to an embodiment disclosed herein.

[0079] refer to Figure 5 The operation method of the battery pack 100 according to the embodiments disclosed herein may include operation S110 of detecting the current of a third line that connects the first line and the second line, and operation S120 of determining whether the first line is disconnected based on the current of the third line.

[0080] In operation S110, which detects the current in the third line connecting the first and second lines, the detection unit 130 can detect the current in the third line 30 connecting the first line 10 and the second line 20. For example, the first line 10 may be a line for supplying power to the battery management device 120, and the second line 20 may be a line for sensing the voltage of the uppermost battery cell through the battery management device 120. In another example, the third line 30 may be a line for supplying power to the battery management device 120 when the first line 10 is disconnected. That is, when the first line 10 is disconnected, current can flow through the third line 30 to supply power to the battery management device 120. In one embodiment, the detection unit 130 can detect whether current flows through the third line 30. In one embodiment, the detection unit 130 may include an optocoupler, which may include a diode. In one embodiment, multiple battery cells may be provided, and the second line 20 may be a voltage sensing line for the uppermost battery cell among the multiple battery cells.

[0081] In operation S120, which determines whether the first line is disconnected based on the current in the third line, the determining unit 140 can determine whether the first line 10 is disconnected based on the current in the third line 30. For example, the determining unit 140 can determine whether the first line 10 is disconnected based on the current in the third line 30 detected by the detection unit 130. In another example, the determining unit 140 can determine that the first line 10 is disconnected when current is detected flowing through the third line 30, and can determine that the first line 10 is not disconnected when no current is detected flowing through the third line 30. In one embodiment, the determining unit 140 may include an MCU.

[0082] Figure 6 This is a flowchart illustrating in more detail a method of operating a battery pack according to embodiments disclosed herein.

[0083] refer to Figure 6 The operation method of the battery pack 100 according to the embodiments disclosed herein may include operation S210 of determining whether current flows through the optocoupler and operation S220 of determining that a first line disconnection occurs when it is determined that current flows through the optocoupler. In one embodiment, operations S210 and S220 may include... Figure 5 In operation S120.

[0084] In operation S210, which determines whether current flows through the optocoupler, the determining unit 140 can determine whether current flows through the optocoupler. For example, when current flows through the third line 30, current can flow through the diode connected to the third line, and therefore, the diode can generate light, and the optocoupler can detect the light generated in the diode, and therefore, current can flow through the optocoupler. In this case, when current flows through the optocoupler, a voltage drop from the reference voltage may occur, and the determining unit 140 can detect the voltage drop and therefore determine that current flows through the optocoupler.

[0085] In operation S220, which determines that a break in the first line has occurred when it is determined that current flows through the optocoupler, the determining unit 140 can determine that a break in the first line 10 has occurred. For example, when the first line 10 is broken, current can flow through the third line 30 and the optocoupler; therefore, when it is determined that current flows through the optocoupler, the determining unit 140 can determine that a break in the first line 10 has occurred.

[0086] Figure 7 This is a block diagram illustrating the hardware configuration of a computing system for performing a battery pack control method according to embodiments disclosed herein.

[0087] refer to Figure 7 The computing system 1000 according to the embodiments disclosed herein may include an MCU 1010, a memory 1020, an input / output I / F 1030, and a communication I / F 1040.

[0088] MCU 1010 can execute various programs stored in memory 1020 (e.g., battery cell voltage measurement program, switch control program, etc.), process various data including battery cell voltage, internal resistance, etc., detect power supply line disconnection, and perform other functions. Figure 2 The processor of the battery pack 100 or the determination unit 140 shown above performs the functions described above.

[0089] The memory 1020 can store various programs related to battery cell voltage measurement, switch control, etc. Furthermore, the memory 1020 can store various data such as battery cell voltage and internal resistance.

[0090] Depending on the needs, multiple memories 1020 can be provided. Memory 1020 can be volatile or non-volatile memory. For memory 1020 as volatile memory, random access memory (RAM), dynamic RAM (DRAM), static RAM (SRAM), etc., can be used. For memory 1020 as non-volatile memory, read-only memory (ROM), programmable ROM (PROM), electrically variable ROM (EAROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), flash memory, etc., can be used. The examples of memory 1020 listed above are merely examples and are not limited to these.

[0091] The Input / Output I / F 1030 can provide an interface for transmitting and receiving data by connecting input devices (not shown) such as a keyboard, mouse, touchpad, etc., and output devices such as a display (not shown) to the MCU 1010.

[0092] As a component capable of transmitting and receiving various types of data to and from a server, the Communication I / F 1040 can be any device capable of supporting wired or wireless communication. For example, the Communication I / F 1040 can transmit and receive programs, various data, etc., for voltage measurement and switching control of individual battery cells to and from a separately configured external server.

[0093] Therefore, the computer program according to the embodiments disclosed herein can be recorded in memory 1020 and processed by MCU 1010, thereby being implemented to execute Figure 2 The module that provides the indicated function.

[0094] The above description is merely an illustration of the technical concept of this disclosure, and various modifications and changes can be made by those skilled in the art without departing from the basic characteristics of the embodiments disclosed herein.

[0095] Therefore, the embodiments disclosed herein are intended to describe, and not limit, the technical spirit of the embodiments disclosed herein, and the scope of the technical spirit of this disclosure is not limited to these embodiments. The scope of protection of the technical spirit disclosed herein should be interpreted by the following claims, and all technical spirit within the same scope should be understood to be included within the scope of this disclosure.

Claims

1. A battery pack, comprising: Battery cell; A battery management device that manages the charging and / or discharging of the battery cells and is connected to the battery cells via a first line and a second line; A detection unit configured to detect the current in a third line that connects the first line and the second line; as well as A determining unit is configured to determine whether a disconnection of the first line has occurred based on whether the current in the third line is detected. The battery management device is further configured to receive power through the first line and to receive power through the third line when the first line is disconnected.

2. The battery pack according to claim 1, wherein, The detection unit includes an optocoupler, and a diode included in the optocoupler is connected to the third line.

3. The battery pack according to claim 2, wherein, The determining unit is further configured to determine that the first line is disconnected when current flows through the optocoupler.

4. The battery pack according to claim 1, wherein, The determining unit includes a microcontroller unit (MCU).

5. The battery pack according to claim 1, wherein, The determining unit is included in the battery management device.

6. The battery pack according to claim 1, wherein, The resistor is connected to the first line and the second line.

7. The battery pack according to claim 1, wherein, The first line is a first power supply line, the second line is a voltage sensing line, and the third line is a second power supply line.

8. The battery pack according to claim 1, wherein, The first line is the first grounding line of the battery management device, the second line is the voltage sensing line of the battery cell, and the third line is the second grounding line of the battery management device.

9. The battery pack according to claim 1, wherein, Multiple battery cells are provided, and the second line is the voltage sensing line of the uppermost battery cell among the multiple battery cells.

10. The battery pack according to claim 1, wherein, Multiple battery cells are provided, and the second line is the voltage sensing line of the bottommost battery cell among the multiple battery cells.

11. A method for operating a battery pack, the method comprising: The current in a third line is detected, which connects the first line and the second line to the battery cell and the battery management device that manages the charging and / or discharging of the battery cell. as well as Whether a disconnection of the first line has occurred is determined based on the detected current in the third line. The battery management device receives power through the first line, and receives power through the third line when the first line is disconnected. The battery management device is further configured to receive power through the first line and to receive power through the third line when the first line is disconnected.

12. The operating method according to claim 11, wherein, Determining whether a disconnection of the first line has occurred based on the detected current in the third line includes: Determine whether current flows through the optocoupler; and When it is determined that the current flows through the optocoupler, it is determined that the first line has been disconnected.

13. The operating method according to claim 11, wherein, Multiple battery cells are provided, and the second line is the voltage sensing line of the uppermost battery cell among the multiple battery cells.

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