Battery management device and its operation method

Abstract

The battery management device according to one embodiment disclosed in this document can include a communication unit that transmits a first signal to a battery cell, a switch that connects the communication unit and the battery cell, and a controller that controls the operation of the switch, receives a second signal corresponding to the first signal, and diagnoses the state of the battery cell based on the second signal.

Description

Technical Field

[0001] The present invention claims the benefit of priority based on Korean Patent Application No. 10-2022-0094265 filed on July 28, 2022, and all contents disclosed in the literature of the Korean patent application are incorporated herein by reference in their entirety. The embodiments disclosed in this document relate to a battery management device and an operating method thereof.

Background Art

[0002] In recent years, research and development on secondary batteries have been actively carried out. Here, a secondary battery is a battery that can be charged and discharged, and includes both conventional Ni / Cd batteries, Ni / MH batteries, etc., and recent lithium-ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of being much higher in energy density than conventional Ni / Cd batteries, Ni / MH batteries, etc. In addition, since lithium-ion batteries can be manufactured in a small and light weight, they are used as a power source for mobile devices. In recent years, their use range has been extended to the power source of electric vehicles, and they have attracted attention as a next-generation energy storage medium.

[0003] Wireless BMS technology is a technology that wirelessly realizes conventional CAN (Controller Area Network) communication and Daisy Chain communication in which a slave BMS monitors a plurality of battery cell stacks and transmits information to a master BMS.

[0004] A BMS generally measures required time, temperature, voltage, current, etc. while repeatedly charging and discharging to determine the state of a battery cell. However, there is a drawback that the detailed characteristics inside the battery cell cannot be reflected only by temperature, voltage, and current.

Summary of the Invention

Problems to be Solved by the Invention

[0005] One object of the embodiments disclosed in this document is to provide a battery management device and an operating method thereof that can measure and diagnose detailed characteristics inside a battery that cannot reflect characteristics such as voltage, current, and temperature.

[0006] One object of the embodiments disclosed in this document is to provide a battery management device and an operating method thereof that can diagnose battery cells based on RF characteristics in order to achieve failure prediction and safety of battery cells when using a wireless BMS.

[0007] The technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description.

Means for Solving the Problems

[0008] A battery management device according to an embodiment disclosed in this document may include a communication unit that transmits a first signal to a battery cell, a switch that connects the communication unit and the battery cell, and a controller that controls the operation of the switch, receives a second signal corresponding to the first signal, and diagnoses the state of the battery cell based on the second signal.

[0009] In one embodiment, the first signal and the second signal are RF (Radio Frequency) signals, and the second signal may be a reflected signal of the first signal.

[0010] In one embodiment, the controller can diagnose the state of the battery cell by comparing the second signal with a signal related to a battery cell in a normal state.

[0011] In one embodiment, the communication unit transmits a first signal corresponding to different transmission powers, the controller receives the second signal corresponding to the different transmission powers, and can diagnose the state of the battery cell based on the second signal corresponding to the different transmission powers.

[0012] In one embodiment, the communication unit transmits a first signal corresponding to different frequencies, and the controller receives a second signal corresponding to the different frequencies and can diagnose the state of the battery cell based on the second signal corresponding to the different frequencies.

[0013] In one embodiment, the controller can diagnose at least one of the impedance, sensitivity change, PER (Peak Error Rate) change, saturation level, and received signal strength indication (RSSI) of the battery cell based on the second signal.

[0014] In one embodiment, the controller receives a third signal including voltage, current, and temperature information from the battery cell and can diagnose the state of the battery cell based on the second signal and the third signal. In one embodiment, the communication unit can be connected to the battery cell or the antenna based on the operation of the switch.

[0015] In one embodiment, when communicating with the battery cell monitor device, the controller can control the operation of the switch so that the communication unit is connected to the antenna, and when not communicating with the battery cell monitor device, the controller can control the operation of the switch so that the communication unit is connected to the battery cell.

[0016] In one embodiment, the communication unit can transmit the first signal when not communicating with the battery cell monitor device. In one embodiment, the communication unit can transmit the first signal when the switch is connected to the battery cell.

[0017] In one embodiment, the communication unit can perform wireless communication with a battery cell monitor device via a radio frequency (RF) signal. In one embodiment, the communication unit can perform the wireless communication when the switch is connected to the antenna.

[0018] A method for operating a battery management device according to an embodiment disclosed in this document includes a step in which a communication unit transmits a first signal to a battery cell, a step in which a controller receives a second signal corresponding to the first signal, and a step in which the controller diagnoses a state of the battery cell based on the second signal. The controller is connected to the communication unit via a switch, and the switch can connect the communication unit and the battery cell.

[0019] In one embodiment, when communicating with the battery cell monitor device, it may further include a step of controlling the operation of the switch so that the communication unit is connected to the antenna, or when not communicating with the battery cell monitor device, controlling the operation of the switch so that the communication unit is connected to the battery cell.

[0020] In one embodiment, the step in which the controller diagnoses the state of the battery cell based on the second signal can diagnose the state of the battery cell by comparing the second signal with a signal related to a battery cell in a normal state.

Advantages of the Invention

[0021] A battery management device and an operation method thereof according to an embodiment disclosed in this document can measure information related to impedance via an RF signal in order to measure and diagnose detailed characteristics inside a battery that cannot reflect characteristics such as voltage, current, and temperature.

[0022] A battery management device and an operation method thereof according to an embodiment disclosed in this document can transmit an RF signal to a battery cell, receive a corresponding signal, and diagnose the state of the battery cell when not performing wireless communication.

[0023] The battery management device and its operation method according to an embodiment disclosed in this document can control a switch depending on whether an RF signal is used for wireless communication or used for diagnosing battery cells.

[0024] The battery management device and its operation method according to an embodiment disclosed in this document can measure information regarding impedance for diagnosing battery cells via an RFIC for wireless communication without adding other devices. In addition to this, various effects directly or indirectly grasped by this document can be provided.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0026] Hereinafter, the embodiments disclosed in this document will be described in detail with reference to exemplary drawings. When assigning reference numerals to the components of each drawing, it should be noted that the same components are assigned the same numerals as much as possible when they are shown on other drawings. Also, when explaining the embodiments disclosed in this document, if it is determined that a specific explanation of a related known configuration or function hinders the understanding of the embodiments disclosed in this document, the detailed explanation thereof will be omitted.

[0027] When explaining the components of the embodiments disclosed in this document, terms such as first, second, A, B, (a), (b), etc. may be used. Such terms are only for distinguishing the components from other components, and the essence, order, or procedure of the components are not limited by such terms. Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those having ordinary knowledge in the technical field to which the embodiments disclosed in this document belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or overly formal sense unless clearly defined in this application.

[0028] FIG. 1 is a block diagram showing the configuration of a battery pack according to an embodiment disclosed in this document. Referring to FIG. 1, a battery pack 1 according to an embodiment disclosed in this document can include battery cells 11, 12, 13, 14, 15, 16, battery management devices 10, 20, 30, 40, 50, 60, and a host controller 70.

[0029] The battery cells 11, 12, 13, 14, 15, 16 can include 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. 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 can include one or more battery cells. In FIG. 1, the battery pack 1 is shown as including six battery cells 11, 12, 13, 14, 15, 16, but is not limited thereto, and the battery pack 1 can include one or n (n is a natural number) battery cells.

[0030] The battery management devices 10, 20, 30, 40, 50, 60 can include the first battery management device 10, the second battery management device 20, the third battery management device 30, the fourth battery management device 40, the fifth battery management device 50, and the sixth battery management device 60. According to an embodiment, the battery management devices 10, 20, 30, 40, 50, 60 are devices that receive inputs of values obtained by measuring the voltage, current, and temperature of the corresponding battery cells 11, 12, 13, 14, 15, 16, and can include a plurality of terminals and a circuit connected to these terminals for processing the received values. Also, the battery management devices 10, 20, 30, 40, 50, 60 can control the ON / OFF of a relay or a contactor, etc., are connected to the battery cells 11, 12, 13, 14, 15, 16, and can monitor the states of the battery cells 11, 12, 13, 14, 15, 16 respectively. In FIG. 1, the battery pack 1 is shown as including six battery management devices 10, 20, 30, 40, 50, 60, but is not limited thereto, and the battery pack 1 can include one or m (m is a natural number) battery management devices.

[0031] The battery management devices 10, 20, 30, 40, 50, 60 can include a wireless communication unit. For example, the wireless communication unit can be realized by an antenna. As another example, the wireless communication unit can include an RFIC. The battery management devices 10, 20, 30, 40, 50, 60 can wirelessly communicate with the host controller 70 based on radio frequency (RF) signals via the wireless communication unit. For example, the battery management devices 10, 20, 30, 40, 50, 60 can transmit information regarding the battery cells (e.g., voltage, current, temperature of the battery cells) to the host controller 70 via the wireless communication unit. According to an embodiment, the battery management devices 10, 20, 30, 40, 50, 60 may be slave BMSs, and the host controller 70 may be a master BMS.

[0032] The host controller 70 can transmit control signals for the battery cells 11, 12, 13, 14, 15, 16 to the battery management devices 10, 20, 30, 40, 50, 60. Thereby, the operations of the battery management devices 10, 20, 30, 40, 50, 60 can be controlled based on the signals applied from the host controller 70.

[0033] According to an embodiment, each of the battery management devices 10, 20, 30, 40, 50, 60 may be substantially the same as the battery management device 100 of FIG. 2. Also, each of the battery cells 11, 12, 13, 14, 15, 16 may be substantially the same as the battery cell 200 of FIG. 2.

[0034] FIG. 2 is a block diagram showing a battery management device and a battery cell according to an embodiment disclosed in this document. Referring to FIG. 2, a battery management device 100 according to an embodiment disclosed in this document can include a communication unit 110, a controller 120, a switch 130, and an antenna 140.

[0035] The communication unit 110 can wirelessly communicate with the battery cell monitor device via a radio frequency (RF) signal. For example, the communication unit 110 can wirelessly communicate with the battery cell monitor device by transmitting an RF signal via the switch 130 and the antenna 140. According to an embodiment, the battery cell monitor device can include the upper controller 70 of FIG. 1. According to an embodiment, the communication unit 110 can include an RFIC.

[0036] The controller 120 can be connected to the battery cell 200. Also, the controller 120 can be connected to the communication unit 110 via the switch 130. According to an embodiment, the controller 120 can control the operation of the switch 130.

[0037] The switch 130 can connect the communication unit 110 and the battery cell 200. Also, the switch 130 can connect the communication unit 110 and the antenna 140. That is, based on the operation of the switch 130, the communication unit 110 can be connected to either the battery cell 200 or the antenna 140.

[0038] FIG. 3 is a diagram showing an example in which a battery management device according to an embodiment disclosed in this document transmits an RF signal and receives a corresponding signal. Referring to FIG. 3, the controller 120 can receive a second signal corresponding to a first signal transmitted by the communication unit 110 to the battery cell via the switch 130. In this case, the switch 130 can connect the communication unit 110, the controller 120, and the battery cell 200. According to an embodiment, the first signal and the second signal are RF signals, and the second signal may be a reflected signal of the first signal.

[0039] According to an embodiment, the battery management device 100 can include a plurality of capacitors 150. For example, a capacitor 150 can be included between the switch 130 and the antenna 140 to transmit only RF signals. As another example, a capacitor 150 can be included between the switch 130 and the battery cell 200 to transmit only RF signals. According to another embodiment, a plurality of inductors (not shown) can be further included between the controller 120 and the battery cell 200.

[0040] Referring back to FIG. 2, the controller 120 can diagnose the state of the battery cell 200 based on the second signal received corresponding to the first signal transmitted by the communication unit 110. For example, the controller 120 can diagnose the state of the battery cell 200 by comparing the received second signal with the signal related to a battery cell in a normal state. According to an embodiment, the controller 120 can diagnose that the battery cell 200 is not in a normal state when the difference between the received second signal and the signal related to a battery cell in a normal state is greater than or equal to a preset value. Therefore, the battery management device 100 can accurately diagnose the state of the battery cell 200 whose DC characteristics cannot be diagnosed based on the AC signal (RF signal, second signal) received corresponding to the AC signal (RF signal, first signal) transmitted by the communication unit 110.

[0041] According to an embodiment, the controller 120 can diagnose at least one or more of the impedance, sensitivity change, PER (Peak Error Rate) change, saturation level, and received signal strength indication (RSSI) of the battery cell 200 based on the second signal.

[0042] According to an embodiment, the signal related to a battery cell in a normal state may be a pre-stored value. That is, the battery management device 100 can further include a memory, and the signal related to a battery cell in a normal state can be stored in the memory.

[0043] According to an embodiment, the controller 120 can receive a third signal including voltage, current, and temperature information from the battery cell 200. In this case, the controller 120 can diagnose the state of the battery cell based on the second signal and the third signal. Therefore, the battery management device 100 can diagnose the state of the battery cell 200 regarding impedance that cannot be diagnosed based on the third signal including voltage, current, and temperature information based on the second signal.

[0044] According to an embodiment, the communication unit 110 can 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 monitor device, the communication unit 110 can be connected to the antenna 140 via the switch 130. As another example, when not communicating with the battery cell monitor device, the communication unit 110 can transmit an RF signal to the battery cell 200 and can be connected to the battery cell 200 and the controller 120 via the switch 130 so that the controller 120 can diagnose the state of the battery cell 200 via the reflected signal.

[0045] According to an embodiment, the communication unit 110 can transmit a first signal when not communicating with the battery cell monitor device. According to an embodiment, the communication unit 110 can transmit a first signal when the switch 130 is connected to the battery cell 200. Also, the communication unit 110 can perform wireless communication when the switch 130 is connected to the antenna 140.

[0046] According to an embodiment, the controller 120 can control the switch 130. For example, when communicating with the battery cell monitor device, the controller 120 can control the operation of the switch 130 so that the communication unit 110 is connected to the antenna 140. As another example, when not communicating with the battery cell monitor device, the controller 120 can control the operation of the switch 130 so that the communication unit 110 is connected to the battery cell 200.

[0047] According to an embodiment, the communication unit 110 can transmit a first signal corresponding to different transmission powers. For example, the communication unit 110 can transmit a first signal corresponding to different transmission powers by changing the power of the RFIC. In this case, the controller 120 can receive a second signal corresponding to different transmission powers, and can diagnose the state of the battery cell based on the second signal corresponding to different transmission powers received for each transmission power. Therefore, the battery management device 100 can more accurately diagnose the state of the battery cell 200 based on signals corresponding to various transmission powers.

[0048] According to an embodiment, the communication unit 110 can transmit a first signal corresponding to different frequencies. For example, the communication unit 110 can transmit a first signal corresponding to different frequencies by changing the power of the RFIC. In this case, the controller 120 can receive a second signal corresponding to different frequencies, and can diagnose the state of the battery cell based on the second signal corresponding to different frequencies received for each frequency. Therefore, the battery management device 100 can more accurately diagnose the state of the battery cell 200 based on signals corresponding to various frequencies.

[0049] According to an embodiment, the controller 120 can graphically represent the second signal corresponding to different transmission powers or frequencies to diagnose the state of the battery cell 200.

[0050] FIG. 4 is a flowchart showing an operation method of a battery management device according to an embodiment disclosed in this document. The operations shown in FIG. 4 can be performed via the battery management device 100 and the battery cell 200 shown in FIG. 2.

[0051] Referring to FIG. 4, the operation method of the battery management device 100 according to an embodiment disclosed in this document may include a step of transmitting a first signal to a battery cell via a switch (S110), a step of receiving a second signal corresponding to the first signal (S120), and a step of diagnosing the state of the battery cell based on the second signal (S130).

[0052] In the step of transmitting a first signal to a battery cell via a switch (S110), the communication unit 110 can transmit a first signal to the battery cell 200 via the switch 130. For example, the communication unit 110 can wirelessly communicate with the battery cell monitor device via a radio frequency (RF) signal. As another example, for instance, the communication unit 110 can wirelessly communicate with the battery cell monitor device by transmitting an RF signal via the switch 130 and the antenna 140.

[0053] In the step of receiving a second signal corresponding to the first signal (S120), the controller 120 can receive a second signal corresponding to the first signal transmitted by the communication unit 110. For example, the controller 120 can be connected to the battery cell 200. Also, the controller 120 can be connected via the communication unit 110 and the switch 130. As another example, the first signal and the second signal are RF signals, and the second signal may be a reflected signal of the first signal.

[0054] In the step (S130) of diagnosing the state of the battery cell based on the second signal, the controller 120 can diagnose the state of the battery cell based on the received second signal. For example, the controller 120 can diagnose the state of the battery cell 200 by comparing the received second signal with the signal related to the battery cell in the normal state. According to an embodiment, when the difference between the received second signal and the signal related to the battery cell in the normal state is greater than or equal to a preset value, the controller 120 can diagnose that the battery cell 200 is not in the normal state. Therefore, the battery management device 100 can accurately diagnose the state of the battery cell 200 that cannot be diagnosed by DC characteristics based on the AC signal (RF signal, second signal) received corresponding to the AC signal (RF signal, first signal) transmitted by the communication unit 110.

[0055] According to an embodiment, in step S110, the communication unit 110 can transmit the first signal according to the transmission power. For example, the communication unit 110 can transmit the first signal according to the transmission power by changing the power of the RFIC. In this case, in step S130, the controller 120 can receive the second signal according to the transmission power and diagnose the state of the battery cell based on the second signal received according to the transmission power. Therefore, the battery management device 100 can more accurately diagnose the state of the battery cell 200 based on signals of various powers.

[0056] According to an embodiment, in step S110, the communication unit 110 can transmit the first signal according to the frequency. For example, the communication unit 110 can transmit the first signal according to the frequency by changing the frequency of the RFIC. In this case, in step S130, the controller 120 can receive the second signal according to the frequency and diagnose the state of the battery cell based on the second signal received according to the frequency. Therefore, the battery management device 100 can more accurately diagnose the state of the battery cell 200 based on signals of various frequencies.

[0057] FIG. 5 is a flowchart specifically showing an operation method of a battery management device according to an embodiment disclosed in this document. Referring to FIG. 5, an operation method of the battery management device 100 according to an embodiment disclosed in this document can include a step (S210) of checking whether to communicate with a battery cell monitor device. When not communicating with the battery cell monitor device, it can include a step (S220) of controlling the switch to be connected to the battery cell, and when communicating with the battery cell monitor device, it can include a step (S230) of controlling the switch to be connected to the antenna.

[0058] In the step (S210) of checking whether to communicate with the battery cell monitor device, the controller 120 can check whether to communicate with the battery cell monitor device via the communication unit 110. For example, the controller 120 can control the switch 130 and control the communication unit 110 to be connected to either the antenna 140 or the battery cell 200.

[0059] When not communicating with the battery cell monitor device, in step S220, the controller 120 can control the switch 130 to be connected to the battery cell 200. In this case, the communication unit 110 can transmit an RF signal to the battery cell 200, and the controller 120 can diagnose the state of the battery cell 200 via the reflected signal.

[0060] When communicating with the battery cell monitor device, in step S230, the controller 120 can control the switch 130 to be connected to the antenna 140.

[0061] FIG. 6 is a block diagram showing a hardware configuration of a computing system for performing an operation method of a battery management device according to an embodiment disclosed in this document.

[0062] Referring to FIG. 6, the computing system 1000 according to an 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.

[0063] The MCU 1010 may execute various programs stored in the memory 1020 (for example, a program for collecting the voltage or current of the battery pack, a wireless communication program, a program for diagnosing the state of the battery cell, a program for processing the RF signal of the battery cell, a program for processing the VIT (voltage, current, temperature) signal of the battery cell, a relay control program, etc.), and process various information including the RF signal received from the battery cell or the current, voltage, temperature information of the battery cell through such programs, and may be a processor that performs the functions of the controller included in the battery management device shown in FIG. 2 described above.

[0064] The memory 1020 can store various programs such as a wireless communication program of the battery cell, a program for diagnosing the state of the battery cell, a program for processing the RF signal of the battery cell, a program for processing the VIT (voltage, current, temperature) signal of the battery cell, and a relay control program. Also, the memory 1020 can store various information such as the RF signal received from the battery cell or the current, voltage, temperature information of the battery cell.

[0065] Such a memory 1020 may be provided in plurality as needed. The memory 1020 may be a volatile memory or a non-volatile memory. As the volatile memory, the memory 1020 can use RAM, DRAM, SRAM, etc. As the non-volatile memory, the memory 1020 can use ROM, PROM, EAROM, EPROM, EEPROM, flash memory, etc. The examples of the memory 1020 listed above are merely illustrative and are not limited to these examples.

[0066] The input / output I / F 1030 can provide an interface that connects between input devices (not shown) such as a keyboard, a mouse, and a touch panel, output devices such as a display (not shown), and the MCU 1010 to enable data transmission and reception.

[0067] The communication I / F 1040 is configured to be able to transmit and receive various data with a server, and may be various devices that can support wired or wireless communication. For example, the battery management device can transmit and receive RF signals received from various battery cells or current, voltage, and temperature information of the battery cells from an externally provided external server via the communication I / F 1040.

[0068] As described above, the computer program according to an embodiment disclosed in this document may be recorded in the memory 1020 and processed by the MCU 1010, and may be realized as a module that performs each function shown in FIG. 2, for example.

[0069] The above description merely exemplarily explains the technical idea disclosed in this document. Those having ordinary knowledge in the technical field to which the embodiments disclosed in this document belong can make various modifications and variations without departing from the essential characteristics of the embodiments disclosed in this document.

[0070] Therefore, the embodiments disclosed in this document are not for limiting the technical idea disclosed in this document but for explaining it, and the scope of the technical idea disclosed in this document is not limited by such embodiments. The protection scope of the technical idea disclosed in this document should be interpreted according to the scope of the claims described later, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of this document.

Claims

1. A communication unit that transmits a first signal to a battery cell, A switch that connects the communication unit and the battery cell, A controller that controls the operation of the switch, receives a second signal corresponding to the first signal, and diagnoses the state of the battery cell based on the second signal, A battery management device comprising:

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

3. The controller: Diagnoses the state of the battery cell by comparing the second signal with a signal related to a battery cell in a normal state. The battery management device according to claim 1.

4. The communication unit: Transmits a first signal corresponding to different transmission powers, The controller: Receives a second signal corresponding to the different transmission powers, Diagnoses the state of the battery cell based on the second signal corresponding to the different transmission powers. The battery management device according to claim 1.

5. The communication unit: Transmits a first signal corresponding to different frequencies, The controller: Receives a second signal corresponding to the different frequencies, Diagnoses the state of the battery cell based on the second signal corresponding to the different frequencies. The battery management device according to claim 1.

6. The controller: Diagnoses at least one of impedance, sensitivity change, PER change, saturation level, and reception intensity of the battery cell based on the second signal. The battery management device according to claim 1.

7. The controller: Receives a third signal including voltage, current, and temperature information from the battery cell, Diagnoses the state of the battery cell based on the second signal and the third signal. The battery management device according to claim 1.

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

9. The controller: When communicating with a battery cell monitor device, controls the operation of the switch so that the communication unit is connected to the antenna, When not communicating with the battery cell monitor device, controls the operation of the switch so that the communication unit is connected to the battery cell. The battery management device according to claim 8.

10. The communication unit: Transmits the first signal when not communicating with a battery cell monitor device. The battery management device according to claim 1.

11. The communication unit: The battery management device according to claim 1, which transmits the first signal when the switch is connected to the battery cell.

12. The communication unit The battery management device according to claim 1, which wirelessly communicates with a battery cell monitor device via a radio frequency signal.

13. The communication unit The battery management device according to claim 12, which performs the wireless communication when the switch is connected to an antenna.

14. A step in which the communication unit transmits a first signal to a battery cell; A step in which the controller receives a second signal corresponding to the first signal; A step in which the controller diagnoses the state of the battery cell based on the second signal; including The controller is connected to the communication unit via a switch, The switch connects the communication unit and the battery cell. A method of operating a battery management device.

15. When communicating with a battery cell monitor device, controlling the operation of the switch so that the communication unit is connected to an antenna, or The method of operating a battery management device according to claim 14, further including a step of controlling the operation of the switch so that the communication unit is connected to the battery cell when not communicating with the battery cell monitor device.

16. The step in which the controller diagnoses the state of the battery cell based on the second signal is Diagnosing the state of the battery cell by comparing the second signal with a signal regarding a battery cell in a normal state. The method of operating a battery management device according to claim 14.

Images