Impedance measurement system and method of operating the same

Abstract

A battery pack according to an embodiment of the present invention can include at least one battery cell, a verification circuit connected to the at least one battery cell and including a load, and a controller that controls the verification circuit to output information regarding the impedance of the load in response to a first command and controls the verification circuit to output information regarding the impedance of the at least one battery cell in response to a second command.

Description

Technical Field

[0001] The present invention claims the benefit of priority based on Korean Patent Application No. 10-2022-0077857 filed on June 24, 2022, and all the contents disclosed in the document of the Korean patent application are incorporated herein by reference in their entirety.

[0002] The embodiments disclosed in this document relate to an impedance measurement system and a method of operating the same.

Background Art

[0003] In recent years, research and development on secondary batteries have been actively conducted. A secondary battery is a battery that can be charged and discharged, and can include all conventional Ni / Cd batteries, Ni / MH batteries, etc., and recent lithium-ion batteries. Lithium-ion batteries have the advantage of having a much higher energy density compared to conventional Ni / Cd batteries, Ni / MH batteries, etc. In addition, since lithium-ion batteries can be manufactured in a small and lightweight manner, they are used as a power source for mobile devices. In recent years, their range of use has been extended to the power source of electric vehicles and they have attracted attention as a next-generation energy storage medium.

[0004] Electrochemical Impedance Spectroscopy can be used to analyze the state of a battery and detect the operating characteristics of the battery over time. Electrochemical impedance spectroscopy can quickly and accurately detect impedance, which is a factor that impedes electrical transmission when a chemical reaction occurs at the electrodes included in the battery.

[0005] By detecting the impedance, the state of the battery can be quickly evaluated, and based on the evaluation, quality inspection of the battery, prediction of the remaining life, and optimization of the charging method according to the state of the battery can be performed.

Summary of the Invention

Problems to be Solved by the Invention

[0006] One object of the embodiments disclosed in this document is to provide a measurement system capable of effectively measuring the impedance of a battery cell and a method for operating the same.

[0007] One object of the embodiments disclosed in this document is to provide a battery pack including a verification circuit for verifying the reliability of an impedance measurement system and a method for operating the same.

[0008] 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

[0009] A battery pack according to an embodiment of the present invention can include at least one battery cell, a verification circuit connected to the at least one battery cell and including a load, and a controller that controls the verification circuit to output information regarding the impedance of the load in response to a first command and controls the verification circuit to output information regarding the impedance of the at least one battery cell in response to a second command.

[0010] According to one embodiment, the verification circuit includes a first switch and a second switch, and the controller can control the second switch to be opened when the first switch is short-circuited and control the first switch to be opened when the second switch is short-circuited.

[0011] According to one embodiment, the first switch can be connected to the load, and the second switch can be connected between the first switch and the battery cell.

[0012] According to one embodiment, the controller can control the first switch to be short-circuited in response to the first command and control the second switch to be short-circuited in response to the second command.

[0013] According to another embodiment of the present invention, an impedance measurement system may include at least one battery cell and a load, and a battery pack that outputs information regarding the impedance of the at least one battery cell or information regarding the impedance of the load, and a measurement module that transmits different commands to the battery pack for the battery pack to output information.

[0014] According to one embodiment, the different commands include a first command and a second command, and the measurement module can transmit the first command or the second command to the battery pack.

[0015] According to one embodiment, the battery pack can output information regarding the impedance of the load in response to the first command and output information regarding the impedance of the at least one battery cell in response to the second command.

[0016] According to one embodiment, the measurement module can compare a preset value with the information regarding the impedance of the load to verify the reliability of the measurement system.

[0017] According to one embodiment, the different commands include a second command, and the measurement module can transmit the second command to the battery pack when the reliability of the measurement system is verified.

[0018] According to one embodiment, the measurement module measures the impedance of the load based on the information regarding the impedance of the load, and determines whether the measured impedance of the load and the preset value are within a preset range to verify the reliability of the measurement system.

[0019] According to one embodiment, the measurement module can measure the impedance of the at least one battery cell based on information regarding the impedance of the at least one battery cell. According to one embodiment, the measurement module can include an electrochemical impedance spectroscopy device.

[0020] A method for operating a measurement system according to another embodiment of the present invention includes steps in which a measurement module transmits a first command to a battery pack; a controller, in response to the first command, controls a first switch included in a verification circuit to short-circuit; the battery pack outputs information regarding the impedance of a load included in the verification circuit; the measurement module compares the information regarding the impedance of the load with a preset value to verify the reliability of the measurement system; according to the verification result of the reliability, the measurement module transmits a second command to the battery pack; the controller, in response to the second command, controls a second switch included in the verification circuit to short-circuit; the battery pack outputs information regarding the impedance of at least one battery cell; and the measurement module measures the impedance of the at least one battery cell based on the information regarding the impedance of the at least one battery cell.

[0021] According to one embodiment, the controller can control the second switch to open when the first switch short-circuits and control the first switch to open when the second switch short-circuits.

[0022] According to one embodiment, the step of verifying the reliability of the measurement system may include the step in which the measurement module measures the impedance of the load based on the information regarding the impedance of the load, and the step in which the measurement module determines whether the measured impedance of the load and the preset value are within a preset range.

[0023] According to one embodiment, when the measured impedance of the load and the preset value are not within a preset range, it may further include a step of notifying the user that there is a problem with the reliability of the measurement system.

Advantages of the Invention

[0024] The impedance measurement system and its operation method according to one embodiment disclosed in this document can verify the reliability of the measurement system. A battery pack according to one embodiment disclosed in this document may include a verification circuit, and the reliability of the measurement system can be verified through the verification circuit.

[0025] The impedance measurement system and its operation method according to one embodiment disclosed in this document can diagnose the state of a battery cell. In addition, various effects that can be directly or indirectly grasped can be provided by this document.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0027] 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 a specific explanation of a related known configuration or function is determined to hinder the understanding of the embodiments disclosed in this document, the detailed explanation thereof will be omitted.

[0028] 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 generally 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.

[0029] FIG. 1 is a block diagram showing an impedance measurement system according to an embodiment disclosed in this document. Referring to FIG. 1, an impedance measurement system 10 according to an embodiment disclosed in this document can include a battery pack 100, a measurement module 200, and a connection module 300.

[0030] The battery pack 100 can include at least one battery cell 110, a verification circuit 120, and a controller 130. The verification circuit 120 can be connected to the battery cell 110 and can include a plurality of switches and loads.

[0031] The controller 130 can control the verification circuit 120 to cause the battery pack 100 to output information regarding the impedance of the battery cell 110 or to output information regarding the impedance of the load.

[0032] The measurement module 200 can send a command to the battery pack 100, respond to the command, and receive information regarding the impedance of the load included in the verification circuit 120 from the battery pack 100 or receive information regarding the impedance of the battery cell 110.

[0033] The measurement module 200 can measure the impedance based on the information regarding the impedance, compare the measured impedance with a preset value, and verify the reliability of the impedance measurement system 10.

[0034] The measurement module 200 can exemplarily include an Electrochemical Impedance Spectroscopy device. The Electrochemical Impedance Spectroscopy device may be a device that measures the alternating current impedance spectrum of the battery cell 110 by a non-destructive inspection method. According to an embodiment, the degradation state and performance of the battery cell 110 can be estimated by comparing the measured alternating current impedance spectrum with an equivalent circuit model of the battery cell 110.

[0035] The Electrochemical Impedance Spectroscopy device can measure the alternating current impedance spectrum based on the amplitude and phase change of the current signal detected from the battery cell 110 by changing the frequency of the alternating current (AC) power supply applied to the battery cell 110.

[0036] The measurement module 200 can be connected via a connection module 300 to a battery cell 110 that is the object of impedance measurement. The connection module 300 can include a plurality of wirings (for example, a wire harness or a cable, etc.) and / or connection parts (for example, a terminal or a connector, etc.).

[0037] When the wiring and / or connection part deteriorates, or noise occurs in the measurement module 200 itself, an error may occur in the information regarding the impedance of the battery cell 110 that is the measurement object.

[0038] When an error occurs in the information regarding the impedance of the battery cell 110, an error may occur in the AC impedance spectrum, making it difficult to diagnose the exact state of the battery cell 110. Also, the reliability of the impedance measurement system 10 cannot be ensured.

[0039] When using the impedance measurement system 10 or the battery pack 100 according to an embodiment of the present invention, before measuring the impedance of the battery cell 110, it is possible to check for abnormalities that have occurred in the wiring and / or connection parts or in the measurement module 200 itself, so as to ensure the reliability of the impedance measurement system 10.

[0040] FIG. 2 specifically shows a battery pack according to an embodiment disclosed in this document. In FIG. 2, the connection state among the battery cell 110, the verification circuit 120, and the controller 130 is specifically shown.

[0041] The battery pack 100 can be connected via a plurality of terminals to a connection module (300 in FIG. 1), and the connection module 300 can be connected via the terminals and other terminals to an external device (for example, the measurement module 200). The battery pack 100 can receive a command signal or power, etc. from the external device via the connection module 300, and can transmit information regarding impedance, etc. to the external device.

[0042] The battery pack 100 can include at least one battery cell 110, and the battery cell can be charged or discharged by an external power source. The battery cell 110 can be connected to a verification circuit 120. Also, the battery cell 110 is connected to a connection module 300 via a first electric wire 201 and a second electric wire 202, and the connection module 300 connected to the first electric wire 201 and the second electric wire 202 can be connected to a measurement module (200 in FIG. 1). According to an embodiment, the first electric wire 201 may be on the (+) terminal side, and the second electric wire 202 may be on the (-) terminal side.

[0043] The measurement module 200 can apply an alternating current power source to the battery pack 100. More specifically, the alternating current power source applied by the measurement module 200 can be applied to the battery pack 100 via the connection module 300 and the first electric wire 201 and the second electric wire 202.

[0044] The verification circuit 120 can include a load 121, a first switch 122, and a second switch 123. The load 121 and the first switch 122 are connected between the first electric wire 201 and the second electric wire 202, and the second switch 123 can be connected between the first switch 122 and the battery cell 110. According to an embodiment, the load 121 may be a resistive element having a preset impedance value.

[0045] The first switch 122 and the second switch 123 are elements for controlling the current flow of the battery pack 100, and illustratively, at least one relay, electromagnetic contactor, etc. can be used. The relay and the contactor can be controlled by a controller 130.

[0046] The controller 130 can monitor the voltage, current, temperature, etc. of the battery cell 110. According to an embodiment, the controller 130 can include a battery management system (e.g., BMS) that controls to prevent overcharging, over-discharging, etc. during charging of the battery cell 110.

[0047] The controller 130 can control the switches included in the battery pack 100 based on the monitored parameters and control the current flow of the battery cell 110.

[0048] According to an embodiment, the controller 130 can output a control signal for a plurality of switches included in the battery pack 100 based on the parameters, or output a control signal for the plurality of switches based on a command received from the outside.

[0049] The controller 130 can include a plurality of sensors for monitoring the state of the battery cell 110. The controller 130 may be an interface that receives inputs of various parameter measurement values for the battery. The controller 130 can include a plurality of terminals and a circuit connected to these terminals for processing the received values.

[0050] The controller 130 according to an embodiment of the present invention can be realized by a processor (e.g., MCU, ECU) and can be connected to an external device of the battery pack 100 via a plurality of terminals.

[0051] For example, the measurement module 200 can control the controller 130 via the command line 131. More specifically, the command applied by the measurement module 200 can be transmitted to the controller 130 via the command line 131 through the connection module 300. The command applied by the measurement module 200 can include a first command and / or a second command.

[0052] The controller 130 can control the verification circuit 120 in response to the received first command or second command. When the controller 130 receives the first command, it can control the first switch 122 to short-circuit (ON state) and the second switch 123 to open (OFF state). Also, when the controller 130 receives the second command, it can control the second switch 123 to short-circuit (ON state) and the first switch 122 to open (OFF state).

[0053] When the first switch 122 short-circuits and the second switch 123 opens, no power is applied to the battery cell 110. In other words, when the measurement module 200 transmits the first command to the controller 130, the current from the power supply applied by the measurement module 200 to the battery pack 100 can be output to the measurement module 200 through the load 121. At this time, the battery pack 100 can output information regarding the impedance of the load 121.

[0054] When the second switch 123 short-circuits and the first switch 122 opens, power can be applied to the battery cell 110. In other words, when the measurement module 200 transmits the second command to the controller 130, the current from the power supply applied by the measurement module 200 to the battery pack can be output to the measurement module 200 through the battery cell 110. At this time, the battery pack 100 can output information regarding the impedance of the battery cell 110.

[0055] According to the embodiment, the controller 130 can transmit signals for adjusting the first switch 122 and the second switch 123 in response to the first command and the second command. The controller 13 can exclusively adjust so that either one of the first switch 122 and the second switch 123 short-circuits.

[0056] The measurement module 200 can measure the impedance of the load 121 based on the information regarding the impedance of the load 121. The measurement module can verify the reliability of the measurement system 10 by comparing the measured impedance of the load 121 with a preset value. The preset value may be the actual impedance of the load 121.

[0057] Specifically, when the measured impedance of the load 121 is within a preset range with respect to the actual impedance of the load 121, the measurement module 200 can determine that the reliability of the measurement system 10 is ensured. When the measured impedance of the load 121 is not within the preset range with respect to the actual impedance of the load 121, the measurement module 200 can determine that the reliability of the measurement system 10 is not ensured. According to an embodiment, when the wiring and / or connections included in the measurement system 10 are aged or noise occurs in the measurement module 200 itself, the reliability of the measurement system 10 cannot be ensured.

[0058] When the reliability of the measurement system 10 is not ensured, the measurement system 10 can notify the user that there is a problem with the reliability of the measurement system 10. According to an embodiment, the measurement system 10 can include visual and / or auditory means capable of sending an alarm to the user. Exemplarily, the visual means can include a display, a lamp, etc., and the auditory means can include a speaker, etc.

[0059] The measurement module 200 can sequentially send a first command and a second command to the battery pack 100. The measurement module 200 can send the first command and, if the reliability of the measurement system 10 is ensured based on the received information regarding the impedance of the load 121, can send the second command to the battery pack 100. The measurement module 200 can measure the impedance of the battery cell 110 based on the received information regarding the impedance of the battery cell 110.

[0060] Figure 3 is a flowchart showing an operation method of an impedance measurement system according to an embodiment disclosed in this document. To ensure the reliability of the measurement system 10 and enable measurement of the impedance of the battery cell 11, the measurement module 200 can send a first command to the battery pack 100 (S100).

[0061] The measurement module 200 can be connected to the connection module 300 and send commands to the battery pack 100 via the connection module 300.

[0062] More specifically, the command applied by the measurement module 200 is transmitted via the connection module 300 and the command line 131 to the controller 130 included in the battery pack 100, and based on the command, the measurement module 200 can control the controller 130.

[0063] The controller 130 can respond to the received first command and control the first switch 122 included in the verification circuit 120 to short-circuit (S200). The controller 130 can respond to the first command, control the first switch 122 to turn on, and control the second switch 123 to turn off.

[0064] When the first switch 122 turns on and the second switch 123 turns off, the load located between the first electric wire 201 and the second electric wire 202 can be electrically connected to the first electric wire 201 and the second electric wire 202, and the battery cell 110 can be electrically separated from the first electric wire 201 and the second electric wire 202.

[0065] When the load 121 is electrically connected to the first electric wire 201 and the second electric wire 202, the battery pack 100 can output information regarding the impedance of the load 121 included in the verification circuit 120 (S300). The load 121 may be a resistive element and can have a preset value of impedance.

[0066] The measurement module 200 can verify the reliability of the measurement system 10 by comparing information on a preset value with information on the impedance of the load 121 (S400). The method by which the measurement module 200 verifies the reliability of the measurement system 10 will be described in more detail with reference to FIG. 4.

[0067] Depending on the verification result of the reliability, the measurement module 200 can transmit a second command to the battery pack 100 (S500). The measurement module 200 can transmit a second command to the controller 130 via the command line 131. The controller 130 can control the second switch 123 included in the verification circuit 120 to short-circuit based on the received second command (S600). The controller 130 can control the second switch 123 to turn ON and control the first switch 122 to turn OFF based on the second command.

[0068] When the second switch 123 turns ON and the first switch 122 turns OFF, the load positioned between the first electric wire 201 and the second electric wire 202 is electrically separated from the first electric wire 201 and the second electric wire 202, and the battery cell 110 can be electrically connected to the first electric wire 201 and the second electric wire 202.

[0069] When the battery cell 110 is electrically connected to the first electric wire 201 and the second electric wire 202, the battery pack 100 can output information on the impedance of the battery cell 110 (S700).

[0070] The measurement module 200 can measure the impedance of the battery cell based on the information on the impedance of the battery cell 110. The measurement module 200 can calculate the impedance spectrum of the battery cell based on the information on the impedance of the battery cell 110, and estimate the degradation state and performance of the battery cell 110 by comparing the calculated impedance spectrum of the battery cell with the equivalent circuit model of the battery cell 110.

[0071] FIG. 4 is a flowchart showing a method of operating an impedance measurement system according to another embodiment disclosed in this document. FIG. 4 shows a method for the measurement module 200 included in the impedance measurement system 10 to measure the impedance of the load 121 and steps to notify the user of the verification result of the reliability of the measurement system 10.

[0072] When the measurement module 200 receives information regarding the impedance of the load 121 from the battery pack 100 (FROM S300), it can measure the impedance of the load 121 based on the information regarding the impedance of the load 121 (S410).

[0073] The measurement module 200 can measure the impedance of the load 121 using the power supply applied to the battery pack 100 and information regarding the impedance of the load 121.

[0074] The measurement module 200 can determine whether the measured impedance of the load 121 and a preset value are within a preset range (S420). The measurement module 200 can store the actual impedance value of the load 121 and set the actual impedance value as the preset value.

[0075] When the preset value and the measured impedance of the load 121 are within the preset range (YES path of S420), the measurement module 200 transmits a second command to the battery pack 100 (S500) and can receive the transmission of information regarding the impedance of the battery cell 110 from the battery pack 100.

[0076] When the preset value and the measured impedance of the load 121 are not within the preset range (NO path of S420), the measurement module 200 can determine that a problem has occurred with the reliability of the measurement system 10.

[0077] The measurement module 200 can notify the user that a problem has occurred with the reliability of the measurement system 10 (S900). The measurement module 200 can notify the user that a problem has occurred using a visual notification device, an auditory notification device, etc., and can terminate the measurement of the impedance with respect to the battery cell 110 when there is a problem with the reliability of the measurement system 10.

[0078] FIG. 5 is a block diagram showing the hardware configuration of a computing system for performing an operation method of an impedance measurement system according to an embodiment disclosed in this document.

[0079] Referring to FIG. 5, a 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.

[0080] According to an embodiment, the computing system 1000 may be a system for performing the operations of the aforementioned controller 130 or measurement module 200.

[0081] The MCU 1010 may be a processor that executes various programs stored in the memory 1020. For example, the MCU 1010 can process the voltage, current data, command signals, switch control signals, etc. of the battery cell 110 necessary for the controller 130 to manage and control the battery cell 110 and / or the battery pack 100. The MCU 1010 may be a processor that processes data and / or signals.

[0082] Also, the MCU 1010 may be a processor that adjusts the current applied to the battery pack 100 so that the measurement module 200 can measure the impedance of the battery cell 110 and / or the load 121, and performs an impedance calculation based on the information output from the battery pack 100. The MCU 1010 may be a processor that processes data and / or signals.

[0083] Memory 1020 can store various programs necessary for managing and controlling the battery pack 100. Further, the memory 1020 can store various programs necessary for measuring impedance.

[0084] For example, the memory 1020 can store various data such as the voltage, current, and characteristic value data of each battery cell 110. Further, the memory 102 can store a program for calculating impedance based on the voltage, current, and characteristic value data of each battery cell 110. A plurality of memories 1020 may be provided as necessary.

[0085] 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.

[0086] The input / output I / F 1030 can provide an interface that connects between an input device (not shown) such as a keyboard, mouse, touch panel, etc., an output device such as a display (not shown), and the MCU 1010 so that data can be transmitted and received.

[0087] 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, through the communication I / F 1040, it is possible to transmit and receive a program and various data for detecting the impedance of the battery cell 110 from an externally provided external server.

[0088] As described above, the computer program according to one embodiment disclosed in this document may be recorded in the memory 1020 and realized as a module that performs each operation of FIGS. 1 to 4 by being processed by the MCU 1010.

[0089] The above description merely exemplarily explains the technical idea disclosed in this document. Those with 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.

[0090] 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 must 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. At least one battery cell, A verification circuit connected to the at least one battery cell and including a load, A controller that controls the verification circuit to output information regarding the impedance of the load in response to a first command and controls the verification circuit to output information regarding the impedance of the at least one battery cell in response to a second command, A battery pack including the same.

2. The verification circuit includes a first switch and a second switch, The controller controls such that the second switch is opened when the first switch is short-circuited and controls such that the first switch is opened when the second switch is short-circuited. The battery pack according to claim 1.

3. The first switch is connected to the load, and the second switch is connected between the first switch and the battery cell. The battery pack according to claim 2.

4. The controller controls such that the first switch is short-circuited in response to the first command and controls such that the second switch is short-circuited in response to the second command. The battery pack according to claim 2 or 3.

5. A battery pack including at least one battery cell and a load, and outputting information regarding the impedance of the at least one battery cell or information regarding the impedance of the load, A measurement module that transmits different commands to the battery pack for the battery pack to output information, An impedance measurement system including the same.

6. The different commands include a first command and a second command, The measurement module transmits the first command or the second command to the battery pack. The impedance measurement system according to claim 5.

7. The battery pack outputs information regarding the impedance of the load in response to the first command, and outputs information regarding the impedance of the at least one battery cell in response to the second command, the impedance measurement system according to claim 6.

8. The measurement module compares a preset value with the information regarding the impedance of the load to verify the reliability of the impedance measurement system, the impedance measurement system according to any one of claims 5 to 7.

9. The different commands include a second command, When the reliability of the impedance measurement system is verified, the measurement module transmits the second command to the battery pack, the impedance measurement system according to claim 8.

10. The measurement module measures the impedance of the load based on the information regarding the impedance of the load, and determines whether the measured impedance of the load and the preset value are within a preset range to verify the reliability of the impedance measurement system, the impedance measurement system according to claim 8.

11. The measurement module measures the impedance of the at least one battery cell based on the information regarding the impedance of the at least one battery cell, the impedance measurement system according to any one of claims 5 to 7.

12. The measurement module includes an electrochemical impedance spectroscopy device, the impedance measurement system according to any one of claims 5 to 7.

13. A step in which the measurement module transmits a first command to the battery pack, A step in which the controller responds to the first command and controls the first switch included in the verification circuit to short-circuit, The step of the battery pack outputting information regarding the impedance of the load included in the verification circuit; The step of the measurement module comparing the information regarding the impedance of the load with a preset value to verify the reliability of the impedance measurement system; The step of the measurement module transmitting a second command to the battery pack according to the verification result of the reliability; The step of the controller responding to the second command and controlling the second switch included in the verification circuit to short-circuit; The step of the battery pack outputting information regarding the impedance of at least one battery cell; The step of the measurement module measuring the impedance of the at least one battery cell based on the information regarding the impedance of the at least one battery cell; An operation method of an impedance measurement system, including the above steps.

14. The controller controls the second switch to be opened when the first switch is short-circuited, and controls the first switch to be opened when the second switch is short-circuited. The operation method of the impedance measurement system according to claim 13.

15. The step of verifying the reliability of the impedance measurement system is The step of the measurement module measuring the impedance of the load based on the information regarding the impedance of the load, and The step of the measurement module determining whether the measured impedance of the load and the preset value are within a preset range. The operation method of the impedance measurement system according to claim 14.

16. The method of operating an impedance measurement system according to claim 15, further comprising the step of notifying the user that there is a problem with the reliability of the impedance measurement system when the impedance of the measured load and the preset value are not within a preset range.

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