Battery management apparatus and operating method thereof

Abstract

A battery management apparatus according to an embodiment disclosed herein may include: a communication unit that transmits a first signal to a battery cell; the switch is used for connecting the communication unit with the battery cell; and a controller that controls an operation of the switch, receives a second signal corresponding to the first signal, and diagnoses a state of the battery cell based on the second signal.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2022-0094265 filed in the Korean Intellectual Property Office on July 28, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0004] Embodiments disclosed herein relate to a battery management device and an operating method thereof. Background Art

[0005] Recently, the research and development of secondary batteries have been actively carried out. In this article, the secondary battery as a rechargeable / dischargeable battery may include all conventional nickel (Ni) / cadmium (Cd) batteries, Ni / metal hydride (MH) batteries, etc. and recent lithium-ion batteries. In secondary batteries, lithium-ion batteries have a much higher energy density than traditional Ni / Cd batteries, Ni / MH batteries, etc. In addition, lithium-ion batteries can be made small and lightweight, so that lithium-ion batteries have been used as power sources for mobile devices, and recently, the use range of lithium-ion batteries has been expanded to the power source of electric vehicles, attracting attention as the next generation of energy storage media.

[0006] The wireless BMS technology refers to a technology that wirelessly implements existing controller area network (CAN) communication or daisy chain communication in which a slave BMS monitors a plurality of battery cell stacks to transmit information to a master BMS.

[0007] The BMS usually determines the state of the battery cell by measuring the time, temperature, voltage, current, etc. required during repeated charging and discharging. However, the detailed characteristics inside the battery cell may not only be reflected by temperature, voltage, and current. Summary of the invention

[0008] Technical issues

[0009] The embodiments disclosed herein are intended to provide a battery management device and an operating method thereof, in which detailed characteristics inside a battery that are not reflected by voltage, current, and temperature can be measured and diagnosed.

[0010] The embodiments disclosed herein are intended to provide a battery management device and an operating method thereof, wherein when a wireless BMS is used, battery cells can be diagnosed based on RF characteristics to predict failures of the battery cells and achieve safety of the battery cells.

[0011] Technical problems of the embodiments disclosed herein are not limited to the above-mentioned technical problems, and other unmentioned technical problems will be clearly understood by those of ordinary skill in the art from the following description.

[0012] Technical Solution

[0013] A battery management device according to an embodiment disclosed herein includes: a communication unit, which is configured to send a first signal to a battery cell; a switch, which is configured to connect the communication unit to the battery cell; and a controller, which is configured to control the operation of the switch, receive a second signal corresponding to the first signal, and diagnose the status of the battery cell based on the second signal.

[0014] In an embodiment, the first signal and the second signal may be radio frequency (RF) signals, and the second signal block may be a reflection signal of the first signal.

[0015] In an embodiment, the controller may be further configured to diagnose the state of the battery cell by comparing the second signal with a signal associated with a battery cell in a normal state.

[0016] In an embodiment, the communication unit may also be configured to send a first signal corresponding to different transmission powers, and the controller may also be configured to: send a second signal corresponding to the different transmission powers; and diagnose the state of the battery cell based on the second signal corresponding to the different transmission powers.

[0017] In an embodiment, the communication unit may also be configured to send a first signal corresponding to a different frequency, and the controller may also be configured to: receive a second signal corresponding to the different frequency; and diagnose the state of the battery cell based on the second signal corresponding to the different frequency.

[0018] In an embodiment, the controller may be further configured to diagnose at least any one of impedance, sensitivity change, peak error rate PER change, saturation level, and received signal strength indication RSSI of the battery cell based on the second signal.

[0019] In an embodiment, the controller may be further configured to: receive a third signal including voltage, current, and temperature information from the battery cell; and diagnose a state of the battery cell based on the second signal and the third signal.

[0020] In an embodiment, the communication unit may be connected to the battery cell or the antenna based on the operation of the switch.

[0021] In an embodiment, the controller may also be configured to: when communication with the battery cell monitoring device is performed, control the operation of the switch to allow the communication unit to be connected to the antenna; and when communication with the battery cell monitoring device is not performed, control the operation of the switch to allow the communication unit to be connected to the battery cell.

[0022] In an embodiment, the communication unit may be further configured to transmit the first signal when communication with the battery cell monitoring device is not performed.

[0023] In an embodiment, the communication unit may be further configured to send the first signal when the switch is connected to the battery cell.

[0024] In an embodiment, the communication unit may be further configured to perform wireless communication with the battery cell monitoring device via a radio frequency (RF) signal.

[0025] In an embodiment, the communication unit may be further configured to perform the wireless communication when the switch is connected to the antenna.

[0026] According to an operating method of a battery management device according to an embodiment disclosed herein, the operating method includes the following steps: a communication unit sends a first signal to a battery cell; a controller receives a second signal corresponding to the first signal; and the controller diagnoses the state of the battery cell based on the second signal, wherein the controller is connected to the communication unit via a switch, and the switch connects the communication unit to the battery cell.

[0027] In an embodiment, the operating method may further include: when communication with the battery cell monitoring device is performed, controlling the operation of the switch to allow the communication unit to be connected to the antenna; and when communication with the battery cell monitoring device is not performed, controlling the operation of the switch to allow the communication unit to be connected to the battery cell.

[0028] In an embodiment, diagnosing, by the controller, the state of the battery cell based on the second signal comprises the step of diagnosing the state of the battery cell by comparing the second signal with a signal associated with a battery cell in a normal state.

[0029] Beneficial Effects

[0030] The battery management apparatus and the operating method thereof according to the embodiments disclosed herein may measure information related to impedance through an RF signal to measure and diagnose detailed characteristics inside the battery that are not reflected by characteristics such as voltage, current, and temperature.

[0031] The battery management apparatus and the operating method thereof according to the embodiments disclosed herein may diagnose the state of the battery cell by transmitting an RF signal to the battery cell and receiving a signal corresponding thereto when wireless communication is not performed.

[0032] The battery management apparatus and the operating method thereof according to the embodiments disclosed herein may control a switch according to whether an RF signal is used for wireless communication or for diagnosing a battery cell.

[0033] The battery management apparatus and the operating method thereof according to the embodiments disclosed herein may measure information related to impedance to diagnose a battery cell through an RFIC for wireless communication without adding another device.

[0034] Furthermore, various effects directly or indirectly recognized from the present disclosure can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a block diagram showing a configuration of a battery pack according to an embodiment disclosed herein.

[0036] Figure 2 is a block diagram illustrating a battery management apparatus and a battery cell according to an embodiment disclosed herein.

[0037] Figure 3 is a diagram showing an example of transmitting an RF signal and receiving corresponding information by a battery management apparatus according to an embodiment disclosed herein.

[0038] Figure 4 is a flowchart illustrating an operating method of a battery management device according to an embodiment disclosed herein.

[0039] Figure 5 is a flowchart illustrating in detail an operation method of a battery management device according to an embodiment disclosed herein.

[0040] Figure 6 is a block diagram illustrating a hardware configuration of a computing system for executing an operating method of a battery management device according to an embodiment disclosed herein. DETAILED DESCRIPTION

[0041] Hereinafter, the embodiments disclosed herein will be described in detail with reference to the exemplary drawings. When adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals even if they are indicated in different drawings. In addition, when describing the embodiments disclosed herein, when it is determined that the detailed description of the related known configuration or function interferes with the understanding of the embodiments disclosed herein, its detailed description will be omitted.

[0042] 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 only used to distinguish one component from another component, without limiting the components to the nature, order, sequence, etc. of the components. The terms (including technical and scientific terms) used herein have the same meanings as those commonly understood by those skilled in the art, as long as these terms are not defined differently. Generally, terms defined in commonly used dictionaries should be interpreted as having the same meanings as the contextual meanings of the relevant technology, and should not be interpreted as having ideal or exaggerated meanings unless they are explicitly defined in this application.

[0043] Figure 1 is a block diagram showing a configuration of a battery pack according to an embodiment disclosed herein.

[0044] Reference Figure 1 , a battery pack 1 according to an embodiment disclosed herein may include battery cells 11 , 12 , 13 , 14 , 15 , and 16 , battery management devices 10 , 20 , 30 , 40 , 50 , and 60 , and a higher-level controller 70 .

[0045] The battery cells 11, 12, 13, 14, 15, and 16 may include a first battery cell 11, a second battery cell 12, a third battery cell 13, a fourth battery cell 14, a fifth battery cell 15, and a sixth battery cell 16. According to an embodiment, each of the first battery cell 11, the second battery cell 12, the third battery cell 13, the fourth battery cell 14, the fifth battery cell 15, and the sixth battery cell 16 may include one battery cell or a plurality of battery cells. Figure 1 The battery pack 1 is illustrated in FIG. 1 as including six battery cells 11 , 12 , 13 , 14 , 15 , and 16 , but the present disclosure is not limited thereto, and the battery pack 1 may include one battery cell or n battery cells (n is a natural number).

[0046] The battery management devices 10, 20, 30, 40, 50 and 60 may include a first battery management device 10, a second battery management device 20, a third battery management device 30, a fourth battery management device 40, a fifth battery management device 50 and a sixth battery management device 60. According to an embodiment, the battery management devices 10, 20, 30, 40, 50 and 60 may receive measurement values ​​of voltage, current and temperature of the corresponding individual battery cells 11, 12, 13, 14, 15 and 16, and include a plurality of terminals, circuits connected to the terminals to process the received values, etc. The battery management devices 10, 20, 30, 40, 50 and 60 may control the on / off of relays, contactors, etc., and may be connected to the battery cells 11, 12, 13, 14, 15 and 16 to monitor the status of each of the battery cells 11, 12, 13, 14, 15 and 16. Although in Figure 1 The battery pack 1 is illustrated as including six battery management devices 10 and 20 , 30 , 40 , 50 , and 60 , but the present disclosure is not limited thereto, and the battery pack 1 may include one battery management device or m battery management devices (m is a natural number).

[0047] The battery management devices 10, 20, 30, 40, 50 and 60 may include a wireless communication unit. For example, the wireless communication unit may be implemented as an antenna. In another example, the wireless communication unit may include an RFIC. The battery management devices 10, 20, 30, 40, 50 and 60 may wirelessly communicate with a higher-level controller 70 through a wireless communication unit based on a radio frequency (RF) signal. For example, the battery management devices 10, 20, 30, 40, 50 and 60 may send information about battery cells (e.g., voltage, current, temperature, etc. of the battery cells) to a higher-level controller 70 through a wireless communication unit. According to an embodiment, the battery management devices 10, 20, 30, 40, 50 and 60 may be slave BMSs, and the higher-level controller 70 may be a master BMS.

[0048] The higher-level controller 70 may send control signals regarding the battery cells 11, 12, 13, 14, 15, and 16 to the battery management devices 10, 20, 30, 40, 50, and 60. Therefore, the battery management devices 10, 20, 30, 40, 50, and 60 may also be controlled in their operations based on the signals applied from the higher-level controller 70.

[0049] According to an embodiment, each of the battery management devices 10, 20, 30, 40, 50, and 60 may be connected to Figure 2 The battery management device 100 is substantially the same as the battery management device 100 of FIG. 1 . Each of the battery cells 11, 12, 13, 14, 15 and 16 can be connected to Figure 2 The battery cells 200 are substantially the same.

[0050] Figure 2 is a block diagram illustrating a battery management apparatus and a battery cell according to an embodiment disclosed herein.

[0051] Reference Figure 2 , the battery management device 100 according to the embodiment disclosed herein may include a communication unit 110 , a controller 120 , a switch 130 , and an antenna 140 .

[0052] The communication unit 110 may perform wireless communication with the battery cell monitoring device through an RF signal. For example, the communication unit 110 may perform wireless communication with the battery cell monitoring device by transmitting an RF signal through the switch 130 and the antenna 140. According to an embodiment, the battery cell monitoring device may include Figure 1 The higher level controller 70. According to an embodiment, the communication unit 110 may include an RFIC.

[0053] The controller 120 may be connected to the battery cell 200. The controller 120 may be connected to the communication unit 110 through the switch 130. According to an embodiment, the controller 120 may control an operation of the switch 130.

[0054] The switch 130 may connect the communication unit 110 to the battery cell 200. The switch 130 may connect the communication unit 110 to the antenna 140. That is, the communication unit 110 may be connected to any one of the battery cell 200 and the antenna 140 based on the operation of the switch 130.

[0055] Figure 3 is a diagram showing an example of transmitting an RF signal and receiving corresponding information by a battery management device according to an embodiment disclosed herein.

[0056] Reference Figure 3 , the controller 120 may receive a second signal corresponding to the first signal transmitted from the communication unit 110 to the battery cell through the switch 130. In this case, the switch 130 may connect the communication unit 110 to the controller 120 and the battery cell 200. According to an embodiment, the first signal and the second signal may be RF signals, and the second signal may be a reflected signal of the first signal.

[0057] According to an embodiment, the battery management device 100 may include a plurality of capacitors 150. For example, the capacitor 150 may be included between the switch 130 and the antenna 140 to transmit an RF signal. In another example, the capacitor 150 may be included between the switch 130 and the battery cell 200 to transmit an RF signal. According to another embodiment, a plurality of inductors (not shown) may also be included between the controller 120 and the battery cell 200.

[0058] Return to reference Figure 2 , the controller 120 may diagnose the state of the battery cell 200 based on the received second signal corresponding to the first signal transmitted from the communication unit 110. For example, the controller 120 may diagnose the state of the battery cell 200 by comparing the received second signal with a signal related to the battery cell in a normal state. According to an embodiment, when the difference between the received second signal and the signal related to the battery cell in a normal state is a preset value or more, the controller 120 may diagnose that the battery cell 200 is not in a normal state. Therefore, the battery management device 100 may accurately diagnose the state of the battery cell 200, which may not be diagnosed with a DC characteristic, based on the received AC signal (RF signal, second signal) corresponding to the AC signal (RF signal, first signal) transmitted from the communication unit 110.

[0059] According to an embodiment, the controller 120 may diagnose at least any one of impedance, sensitivity change, peak error rate (PER) change, saturation level, and received signal strength indication (RSSI) of the battery cell 200 based on the second signal.

[0060] According to an embodiment, the signal related to the battery cell in the normal state may be a previously stored value. That is, the battery management device 100 may further include a memory in which the signal related to the battery cell in the normal state may be stored.

[0061] According to an embodiment, the controller 120 may receive a third signal including voltage, current, and temperature information from the battery cell 200. In this case, the controller 120 may diagnose the state of the battery cell based on the second signal and the third signal. Therefore, the battery management device 100 may diagnose the impedance-related state of the battery cell based on the second signal, which is not diagnosed based on the third signal including voltage, current, and temperature information.

[0062] According to an embodiment, the communication unit 110 may be connected to the battery cell 200 or the antenna 140 based on the operation of the switch 130. For example, when communicating with the battery cell monitoring device, the communication unit 110 may be connected to the antenna 140 through the switch 130. In another example, when not communicating with the battery cell monitoring device, the communication unit 110 may be connected to the battery cell 200 and the controller 120 through the switch 130 to allow the controller 120 to diagnose the state of the battery cell 200 by transmitting an RF signal to the battery cell 200 and the reflected signal.

[0063] According to an embodiment, the communication unit 110 may transmit the first signal when not communicating with the battery cell monitoring device.

[0064] According to an embodiment, when the switch 130 is connected to the battery cell 200, the communication unit 110 may transmit the first signal. When the switch 130 is connected to the antenna 140, the communication unit 110 may perform wireless communication.

[0065] According to an embodiment, the controller 120 may control the switch 130. For example, when the communication unit 110 communicates with the battery cell monitoring device, the controller 120 may control the operation of the switch 130 to connect the communication unit 110 to the antenna 140. In another example, when the communication unit 110 does not communicate with the battery cell monitoring device, the controller 120 may control the operation of the switch 130 to connect the communication unit 110 to the battery cell 200.

[0066] According to an embodiment, the communication unit 110 may send a first signal corresponding to different transmission powers. For example, the communication unit 110 may send a first signal corresponding to different transmission powers by changing the power of the RFIC. In this case, the controller 120 may receive a second signal corresponding to the different transmission powers, and diagnose the state of the battery cell based on the second signal corresponding to the different transmission powers received for each transmission power. Therefore, the battery management device 100 can accurately manage the state of the battery cell 200 based on the signals corresponding to the various transmission powers.

[0067] According to an embodiment, the communication unit 110 may transmit a first signal corresponding to different frequencies. For example, the communication unit 110 may transmit a first signal corresponding to different frequencies by changing the power of the RFIC. In this case, the controller 120 may receive a second signal corresponding to different frequencies, and diagnose the state of the battery cell based on the second signal corresponding to the different frequencies received for each frequency. Therefore, the battery management device 100 may accurately manage the state of the battery cell 200 based on the signals corresponding to various frequencies.

[0068] According to an embodiment, the controller 120 may diagnose the state of the battery cell 200 by plotting the second signal corresponding to different transmission powers or frequencies as a graph.

[0069] Figure 4 is a flowchart illustrating an operating method of a battery management device according to an embodiment disclosed herein. Figure 4 The operations shown can be performed by Figure 2 The battery management device 100 and the battery cell 200 shown perform.

[0070] Reference Figure 4, the operating method of the battery management device 100 according to the embodiment disclosed herein may include an operation S110 of sending a first signal to a battery cell through a switch, an operation S120 of receiving a second signal corresponding to the first signal, and an operation S130 of diagnosing a state of the battery cell based on the second signal.

[0071] In operation S110 of transmitting the first signal to the battery cell through the switch, the communication unit 110 may transmit the first signal to the battery cell 200 through the switch 130. For example, the communication unit 110 may perform wireless communication with the battery cell monitoring device through an RF signal. In another example, the communication unit 110 may perform wireless communication with the battery cell monitoring device by transmitting an RF signal through the switch 130 and the antenna 140.

[0072] In operation S120 of receiving the second signal corresponding to the first signal, the controller 120 may receive the second signal corresponding to the first signal transmitted from the communication unit 110. For example, the controller 120 may be connected to the battery cell 200. The controller 120 may be connected to the communication unit 110 through the switch 130. In another example, the first signal and the second signal may be RF signals, and the second signal may be a reflected signal of the first signal.

[0073] In operation S130 of diagnosing the state of the battery cell based on the second signal, the controller 120 may diagnose the state of the battery cell based on the received second signal. For example, the controller 120 may diagnose the state of the battery cell 200 by comparing the received second signal with a signal associated with the battery cell in a normal state. According to an embodiment, when the difference between the received second signal and the signal associated with the battery cell in a normal state is a preset value or greater, the controller 120 may diagnose that the battery cell 200 is not in a normal state. Therefore, the battery management device 100 may accurately diagnose the state of the battery cell 200, which may not be diagnosed with a DC characteristic, based on the received AC signal (RF signal, first signal) corresponding to the AC signal (RF signal, first signal) transmitted from the communication unit 110.

[0074] According to an embodiment, in operation S110, the communication unit 110 may send a first signal for each transmission power. In another example, the communication unit 110 may send a first signal for each transmission power by changing the power of the RFIC. In this case, in operation S130, the controller 120 may receive a second signal for each transmission power, and diagnose the state of the battery cell based on the second signal received for each transmission power. Therefore, the battery management device 100 can accurately manage the state of the battery cell 200 based on the signals of various powers.

[0075] According to an embodiment, in operation S110, the communication unit 110 may send a first signal for each frequency. For example, the communication unit 110 may send a first signal for each frequency by changing the power of the RFIC. In this case, in operation S130, the controller 120 may receive a second signal for each frequency, and diagnose the state of the battery cell based on the second signal received for each frequency. Therefore, the battery management device 100 can accurately manage the state of the battery cell 200 based on the signals of various frequencies.

[0076] Figure 5 is a flowchart illustrating in detail an operation method of a battery management device according to an embodiment disclosed herein.

[0077] Reference Figure 5 According to the embodiment disclosed in this document, the operating method of the battery management device 100 may include an operation S210 of determining whether to perform communication with a battery cell monitoring device, an operation S220 of controlling a switch to be connected to a battery cell when not communicating with the battery cell monitoring device, and an operation S230 of controlling a switch to be connected to an antenna when communicating with the battery cell monitoring device.

[0078] In operation S210 of determining whether to perform communication with the battery cell monitoring device, the controller 120 may determine whether to perform communication with the battery cell monitoring device through the communication unit 110. For example, the controller 120 may control the switch 130 to connect the communication unit 110 to either the antenna 140 or the battery cell 200.

[0079] In operation S220, when communication with the battery cell monitoring device is not performed, the controller 120 may control the switch 130 to connect to the battery cell 200. In this case, the communication unit 110 may transmit an RF signal to the battery cell 200 to allow the controller 120 to diagnose the state of the battery cell 200 through a reflected signal.

[0080] In operation S230 , when communication with the battery cell monitoring device is performed, the controller 120 may control the switch 130 to be connected to the antenna 140 .

[0081] Figure 6 is a block diagram illustrating a hardware configuration of a computing system for executing an operating method of a battery management device according to an embodiment disclosed herein.

[0082] Reference Figure 6 , 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 .

[0083] The MCU 1010 may be a processor that executes various programs stored in the memory 1020 (e.g., a battery pack voltage or current collection program, a wireless communication program, a battery cell status diagnosis program, a battery cell RF signal processing program, a battery cell VIT (voltage, current, temperature) signal processing program, a relay control program, etc.), processes RF signals received from battery cells or various information including current, voltage, temperature information of the battery cells, etc. through these programs, and executes Figure 2 The above functions of the battery management device are shown.

[0084] The memory 1020 may store various programs, such as a wireless communication program of a battery cell, a battery cell status diagnosis program, a battery cell RF signal processing program, a battery cell VIT (voltage, current, temperature) signal processing program, a relay control program, etc. In addition, the memory 1020 may store various information, such as an RF signal received from a battery cell or current, voltage, temperature information of the battery cell, etc.

[0085] The memory 1020 may be set to a plurality as needed. The memory 1020 may be a volatile memory or a non-volatile memory. For the memory 1020 as a volatile memory, a random access memory (RAM), a dynamic RAM (DRAM), a static RAM (SRAM), etc. may be used. For the memory 1020 as a non-volatile memory, a read-only memory (ROM), a programmable ROM (PROM), an electrically variable ROM (EAROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), a flash memory, etc. may be used. The above-listed examples of the memory 1020 are only examples and are not limited thereto.

[0086] The input / output I / F 1030 may provide an interface for transmitting and receiving data by connecting an input device (not shown) such as a keyboard, a mouse, a touch panel, etc. and an output device such as a display (not shown) to the MCU 1010 .

[0087] The communication I / F 1040, which is a component capable of transmitting and receiving various data to and from a server, may be various devices capable of supporting wired or wireless communication. For example, the battery management apparatus may transmit RF signals received from various battery cells or current, voltage, and temperature information of the battery cells to a separately provided external server through the communication I / F 1040, and receive RF signals received from various battery cells or current, voltage, and temperature information of the battery cells from a separately provided external server.

[0088] In this way, the computer program according to the embodiment disclosed herein may be recorded in the memory 1020 and processed by the MCU 1010, thereby being implemented as an execution Figure 2 Modules with the functions shown.

[0089] The above description merely illustrates the technical concept of the present disclosure, and a person skilled in the art to which the embodiments disclosed herein pertain can make various modifications and changes without departing from the basic features of the embodiments of the present disclosure.

[0090] Therefore, the embodiments disclosed herein are intended to describe rather than limit the technical spirit of the embodiments disclosed herein, and the scope of the technical spirit of the present disclosure is not limited by these embodiments disclosed herein. The protection scope of the technical spirit disclosed herein should be interpreted by the attached claims, and all technical spirits within the same scope should be understood to be included in the scope of the present disclosure.

Claims

1. A battery management device, comprising: a communication unit configured to send a first signal to the battery cell; a switch configured to connect the communication unit to the battery cell; as well as A controller is configured to control the operation of the switch, receive a second signal corresponding to the first signal, and diagnose a state of the battery cell based on the second signal.

2. The battery management device according to claim 1, wherein: The first signal and the second signal are radio frequency (RF) signals, and The second signal is a reflected signal of the first signal.

3. The battery management device according to claim 1, wherein: The controller is further configured to diagnose a state of the battery cell by comparing the second signal with a signal associated with a battery cell in a normal state.

4. The battery management device according to claim 1, wherein: The communication unit is further configured to send a first signal corresponding to different transmission powers, and The controller is also configured to: sending a second signal corresponding to the different transmission power; and The status of the battery cell is diagnosed based on the second signal corresponding to the different transmission powers.

5. The battery management device according to claim 1, wherein: The communication unit is further configured to send a first signal corresponding to a different frequency, and The controller is also configured to: receiving a second signal corresponding to the different frequency; and The state of the battery cell is diagnosed based on the second signal corresponding to the different frequency.

6. The battery management device according to claim 1, wherein: The controller is further configured to diagnose at least any one of impedance, sensitivity variation, peak error rate PER variation, saturation level, and received signal strength indication RSSI of the battery cell based on the second signal.

7. The battery management device according to claim 1, wherein: The controller is also configured to: receiving a third signal including voltage, current, and temperature information from the battery cell; and The state of the battery cell is diagnosed based on the second signal and the third signal.

8. The battery management device according to claim 1, wherein: The communication unit is connected to the battery cell or the antenna based on the operation of the switch.

9. The battery management device according to claim 8, wherein: The controller is also configured to: When communication with a battery cell monitoring device is performed, controlling the operation of the switch to allow the communication unit to be connected to the antenna; and When communication with the battery cell monitoring device is not performed, the operation of the switch is controlled to allow the communication unit to be connected to the battery cell.

10. The battery management device according to claim 1, wherein: The communication unit is further configured to transmit the first signal when communication with the battery cell monitoring device is not performed.

11. The battery management device according to claim 1, wherein: The communication unit is further configured to send the first signal when the switch is connected to the battery cell.

12. The battery management device according to claim 1, wherein: The communication unit is further configured to perform wireless communication with the battery cell monitoring device via a radio frequency (RF) signal.

13. The battery management device according to claim 12, wherein: The communication unit is further configured to perform the wireless communication when the switch is connected to an antenna.

14. A method for operating a battery management device, the method comprising the following steps: Sending a first signal to the battery cell by the communication unit; receiving, by a controller, a second signal corresponding to the first signal; as well as diagnosing, by the controller, a state of the battery cell based on the second signal, wherein the controller is connected to the communication unit via a switch, and The switch connects the communication unit to the battery cell.

15. The operating method according to claim 14, further comprising the following steps: controlling the operation of the switch to allow the communication unit to be connected to the antenna when communication with the battery cell monitoring device is performed; as well as When communication with the battery cell monitoring device is not performed, the operation of the switch is controlled to allow the communication unit to be connected to the battery cell.

16. The operating method according to claim 14, wherein: The step of diagnosing, by the controller, the state of the battery cell based on the second signal includes the step of diagnosing the state of the battery cell by comparing the second signal with a signal associated with a battery cell in a normal state.

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