Impedance measurement system and method of operation thereof

Abstract

A battery pack according to an embodiment of the present invention comprises: 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 about the impedance of the load in response to the first command and controls the verification circuit to output information about the impedance of the at least one battery cell in response to the second command.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2022-0077857 filed in the Korean Intellectual Property Office on June 24, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0004] Embodiments disclosed herein relate to impedance measurement systems and methods of operating the same. Background Art

[0005] Recently, research and development of secondary batteries have been actively carried out. Secondary batteries as rechargeable / dischargeable batteries can include all traditional nickel (Ni) / cadmium (Cd) batteries, nickel / metal hydride (MH) batteries, etc. and recent lithium-ion 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, their scope of use has been expanded to power sources for electric vehicles, attracting attention as the next generation of energy storage media.

[0006] In order to analyze the state of a battery over time and detect the operating characteristics of the battery, electrochemical impedance spectroscopy can be used. Electrochemical impedance spectroscopy can quickly and accurately detect impedance, which is a factor that hinders the transmission of electricity when chemical reactions occur at electrodes contained in a battery.

[0007] The state of the battery can be quickly evaluated by detecting the impedance, and based on the evaluation, the battery quality can be checked, the remaining life can be predicted, and the charging method corresponding to the battery state can be optimized. Summary of the invention

[0008] Technical issues

[0009] The embodiments disclosed herein are intended to provide a measurement system capable of effectively measuring the impedance of a battery cell and an operation method thereof.

[0010] Embodiments disclosed herein are also directed to providing a battery pack including a verification circuit for verifying the reliability of an impedance measurement system and an operating method thereof.

[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 ordinary technicians in the art through the following description.

[0012] Technical Solution

[0013] A battery pack according to an embodiment of the present invention includes: at least one battery cell; a verification circuit connected to the at least one battery cell and including a load; and a controller configured to control the verification circuit to output information about the impedance of the load in response to a first command, and to control the verification circuit to output information about the impedance of the at least one battery cell in response to a second command.

[0014] According to an embodiment, the verification circuit may include a first switch and a second switch, and the controller may be further configured to 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.

[0015] According to an embodiment, the first switch may be connected to the load, and the second switch may be connected between the first switch and the battery cell.

[0016] According to an embodiment, the controller may be further configured to control the first switch to be short-circuited in response to the first command, and to control the second switch to be short-circuited in response to the second command.

[0017] According to another embodiment of the present invention, an impedance measurement system includes: a battery pack, which includes at least one battery cell and a load, and is configured to output information about the impedance of at least one battery cell or information about the impedance of the load; and a measurement module, which is configured to send different commands to the battery pack to output information from the battery pack.

[0018] According to an embodiment, the different commands may include a first command and a second command, and the measurement module may be further configured to send the first command or the second command to the battery pack.

[0019] According to an embodiment, the battery pack may be further configured to output information about the impedance of the load in response to the first command, and output information about the impedance of at least one battery cell in response to the second command.

[0020] According to an embodiment, the measurement module may be further configured to compare the information about the impedance of the load with a preset value to verify the reliability of the measurement system.

[0021] According to an embodiment, the different commands may include a second command, and the measurement module may be further configured to send the second command to the battery pack when the reliability of the measurement system is verified.

[0022] According to an embodiment, the measurement module may be further configured to measure the impedance of the load based on the information about the impedance of the load, and determine whether the measured impedance of the load and a preset value fall within a preset range to verify the reliability of the measurement system.

[0023] According to an embodiment, the measurement module may be further configured to measure the impedance of the at least one battery cell based on the information about the impedance of the at least one battery cell.

[0024] According to an embodiment, the measurement module may include an electrochemical impedance spectroscopy device.

[0025] According to another embodiment of the present invention, an operating method of an impedance measurement system includes the following steps: a first command is sent by a measuring module to a battery pack; in response to the first command, a controller controls a first switch included in a verification circuit to be short-circuited; the battery pack outputs information about the impedance of a load included in the verification circuit; the measuring module compares the information about the impedance of the load with a preset value to verify the reliability of the measurement system; the measuring module sends a second command to the battery pack according to a result of the reliability verification; in response to the second command, the controller controls a second switch included in the verification circuit to be short-circuited; the battery pack outputs information about the impedance of at least one battery cell; and the measuring module measures the impedance of at least one battery cell based on the information about the impedance of at least one battery cell.

[0026] According to an embodiment, the controller may be further configured to 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.

[0027] According to an embodiment, the step of verifying the reliability of the measurement system may include: measuring the impedance of the load by the measurement module based on information about the impedance of the load; and determining by the measurement module whether the measured impedance of the load and a preset value fall within a preset range.

[0028] According to an embodiment, the operating method may further include the following step: when the measured impedance of the load and the preset value do not fall within a preset range, notifying the user that there is a problem with the reliability of the measurement system.

[0029] Technical Effects

[0030] The impedance measurement system and the operating method thereof according to the embodiments disclosed herein can verify the reliability of the measurement system.

[0031] The battery pack according to the embodiment disclosed herein may include a verification circuit and verify the reliability of the measurement system through the verification circuit.

[0032] The impedance measurement system and the operating method thereof according to the embodiments disclosed herein may diagnose the state of a battery cell.

[0033] Furthermore, various effects directly or indirectly recognized from the present disclosure can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1is a block diagram of an impedance measurement system according to an embodiment disclosed herein.

[0035] Figure 2 A battery pack according to an embodiment disclosed herein is shown in detail.

[0036] Figure 3 is a flow chart illustrating a method of operating an impedance measurement system according to an embodiment disclosed herein.

[0037] Figure 4 is a flow chart illustrating a method of operating an impedance measurement system according to another embodiment disclosed herein.

[0038] Figure 5 is a block diagram of a hardware configuration of a computing system for executing an operating method of an impedance measurement system according to an embodiment disclosed herein. DETAILED DESCRIPTION

[0039] Hereinafter, the embodiments disclosed in this document will be described in detail with reference to the exemplary drawings. When adding reference numerals to the components of the drawings, it should be noted that the same reference numerals are given even if the same components are represented in different drawings. In addition, when describing the embodiments disclosed in this document, when it is determined that the detailed description of the related known configuration or function interferes with the understanding of the embodiments disclosed in this document, its detailed description will be omitted.

[0040] In order 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 and do not limit the component in terms of the nature, order, sequence, etc. of the component. The terms (including technical and scientific terms) used herein have the same meaning as the terms commonly understood by those skilled in the art, unless these terms are defined differently. In general, the terms defined in commonly used dictionaries should be interpreted as having the same meaning as the contextual meaning of the relevant technology, and should not be interpreted as having an ideal or exaggerated meaning unless these terms are clearly defined in this application.

[0041] Figure 1 is a block diagram of an impedance measurement system according to an embodiment disclosed herein.

[0042] Reference Figure 1 , an impedance measurement system 10 according to an embodiment disclosed herein may include a battery pack 100 , a measurement module 200 , and a connection module 300 .

[0043] The battery pack 100 may include at least one battery cell 110 , a verification circuit 120 , and a controller 130 .

[0044] The verification circuit 120 may be connected to the battery cell 110 and include a plurality of switches and a load.

[0045] The controller 130 may control the verification circuit 120 so that the battery pack 100 may output information about the impedance of the battery cell 110 or information about the impedance of the load.

[0046] The measurement module 200 may transmit a command to the battery pack 100 , and receive information about the impedance of a load included in the verification circuit 120 or information about the impedance of the battery cell 110 from the battery pack 100 in response to the command.

[0047] The measurement module 200 may measure impedance based on the information about the impedance and compare the measured impedance with a preset value to verify the reliability of the impedance measurement system 10 .

[0048] The measurement module 200 may include, for example, an electrochemical impedance spectroscopy device. The electrochemical impedance spectroscopy device may measure the AC impedance spectrum of the battery cell 110 by using a non-destructive testing method. According to an embodiment, by comparing the measured AC impedance spectrum with an equivalent circuit model of the battery cell 110, degradation and performance of the battery cell 110 may be estimated.

[0049] The electrochemical impedance spectroscopy apparatus may measure an alternating current impedance spectrum based on changes in amplitude and phase of a current signal detected from the battery cell 110 with respect to changes in frequency of alternating current (AC) power applied to the battery cell 110 .

[0050] The measurement module 200 may be connected to the battery cell 110 subjected to impedance measurement through the connection module 300. The connection module 300 may include a plurality of wires (eg, wire harnesses or cables, etc.) and / or connection units (eg, terminals, connectors, etc.).

[0051] When the wire and / or the connection unit deteriorates or noise is generated in the measurement module 200 , an error may occur in the information on the impedance of the battery cell 110 as the measurement object.

[0052] When an error occurs in the information about the impedance of the battery cell 110, an error may occur in the AC impedance spectrum, and it may be difficult to diagnose an accurate state of the battery cell 110. In addition, the reliability of the impedance measurement system 10 may not be guaranteed.

[0053] When using the impedance measurement system 10 or the measurement module 200 according to the embodiment of the present invention, errors occurring in the wires and / or connection units or errors occurring in the measurement module 200 may be checked before measuring the impedance of the battery cell 110 to ensure the reliability of the impedance measurement system 10 .

[0054] Figure 2A battery pack according to an embodiment disclosed herein is shown in detail.

[0055] Figure 2 The connection status among the battery unit 110, the verification circuit 120 and the controller 130 is shown in detail.

[0056] The battery pack 100 can be connected to the connection module ( Figure 1 300), and the connection module 300 can be connected to an external device (e.g., the measurement module 200) through a terminal different from the plurality of terminals. The battery pack 100 receives a command signal, power, etc. from the external device, and transmits information about impedance, etc. to the external device through the connection module 300.

[0057] The battery pack 100 may include at least one battery cell 110 that may be charged or discharged by external power.

[0058] The battery cell 110 may be connected to the verification circuit 120. The battery cell 110 may be connected to the connection module 300 through the first wiring 201 and the second wiring 202, and the connection module 300 connected to the first wiring 201 and the second wiring 202 may be connected to the measurement module ( Figure 1 According to an embodiment, the first wiring 201 may be located on the positive (+) terminal side, and the second wiring 202 may be located on the negative (-) terminal side.

[0059] The measuring module 200 may apply alternating current to the battery pack 100 .

[0060] More specifically, the alternating current applied to the measuring module 200 may be applied to the battery pack 100 through the first wiring 201 and the second wiring 202 via the connecting module 300 .

[0061] The verification circuit 120 may include a load 121 , a first switch 122 , and a second switch 123 .

[0062] The load 121 and the first switch 122 may be connected between the first wiring 201 and the second wiring 202 , and the second switch 123 may be connected between the first switch 122 and the battery cell 110 .

[0063] According to an embodiment, the load 121 may be a resistor element having a preset impedance value.

[0064] The first switch 122 and the second switch 123 are elements for controlling the current flow of the battery pack 100 , and as an example, at least one relay, an electromagnetic contactor, etc. may be used. The relay and the contactor may be implemented by the controller 130 .

[0065] The controller 130 may monitor the voltage, current, temperature, etc. of the battery cell 110. According to an embodiment, the controller 130 may include a battery management system (eg, RBMS) that performs a control operation to prevent overcharging, overdischarging, etc. when the battery cell 110 is charged.

[0066] The controller 130 may control switches included in the battery pack 100 and control current flow of the battery cells 110 based on the monitored parameters.

[0067] According to an embodiment, the controller 130 may output control signals for a plurality of switches included in the battery pack 100 based on a parameter, and output control signals for the plurality of switches based on a command received from the outside.

[0068] The controller 130 may include a plurality of sensors for monitoring the status of the battery cell 110. The controller 130 may be an interface for receiving various parameter measurements of the battery. The controller 130 may include a plurality of terminals, circuits for processing input values ​​associated with these terminals, and the like.

[0069] The controller 130 according to the embodiment of the present invention may be implemented with a processor (eg, MCU, ECU), and may be connected to an external device of the battery pack 100 through a plurality of terminals.

[0070] For example, the measurement module 200 may control the controller 130 through the command line 131 .

[0071] More specifically, the command applied by the measurement module 200 may be sent to the controller 130 through the command line 131 via the connection module 300 .

[0072] The command applied by the measurement module 200 may include a first command and / or a second command.

[0073] The controller 130 may control the verification circuit 120 in response to the received first command or the second command. When the first command is received, the controller 130 may control the first switch 122 to be short-circuited (on state) and control the second switch 123 to be disconnected (off state). When the second command is received, the controller 130 may control the second switch 123 to be short-circuited (on state) and control the first switch 122 to be disconnected (off state).

[0074] Once the first switch 122 is short-circuited and the second switch 123 is opened, power is not applied to the battery cell 110. That is, when the measuring module 200 sends the first command to the controller 130, a current corresponding to the power applied to the battery pack 100 by the measuring module 200 may be output to the measuring module 200 through the load 121. In this case, information about the impedance of the load 121 may be output from the battery pack 100.

[0075] Once the second switch 123 is short-circuited and the first switch 122 is opened, power may be applied to the battery cell 110. That is, when the measuring module 200 transmits the second command to the controller 130, a current corresponding to the power applied to the battery pack by the measuring module 200 may be output to the measuring module 200 through the battery cell 110. In this case, information on the impedance of the battery cell 110 may be output from the battery pack 100.

[0076] According to an embodiment, the controller 130 may transmit a signal for adjusting the first switch 122 and the second switch 123 in response to the first command and the second command. The controller 130 may perform exclusive adjustment to short-circuit any one of the first switch 122 and the second switch 123.

[0077] The measurement module 200 may measure the impedance of the load 121 based on the information about the impedance of the load 121. The measurement module may compare the measured impedance of the load 121 with a preset value to verify the reliability of the measurement system 10. The preset value may be the actual impedance of the load 121.

[0078] More specifically, when the measured impedance of the load 121 falls within the preset range of the actual impedance of the load 121, the measurement module 200 may determine that the reliability of the measurement system 10 is guaranteed. When the measured impedance of the load 121 does not fall within the preset range of the actual impedance of the load 121, the measurement module 200 may determine that the reliability of the measurement system 10 is not guaranteed. According to an embodiment, when the wires and / or connection units included in the measurement system 10 age or generate noise in the measurement module 200, the reliability of the measurement system 10 may not be guaranteed.

[0079] When the reliability of the measurement system 10 cannot be guaranteed, 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 may include a visual and audio device capable of sending an alarm to the user. For example, the visual device may include a display, a light, etc., and the audio device may include a speaker, etc.

[0080] The measuring module 200 may sequentially send the first command and the second command to the battery pack 100. The measuring module 200 may send the first command, and when the reliability of the measuring system 10 is guaranteed, the measuring module 200 may send the second command to the battery pack 100 based on the received information about the impedance of the load 121. The measuring module 200 may measure the impedance of the battery cell 110 based on the received information about the impedance of the battery cell 110.

[0081] Figure 3is a flow chart illustrating a method of operating an impedance measurement system according to an embodiment disclosed herein.

[0082] In order to ensure the reliability of the measurement system 10 and measure the impedance of the battery cell 11 , the measurement module 200 may send a first command to the battery pack 100 in operation S100 .

[0083] The measuring module 200 may be connected to the connection module 300 and transmit a command to the battery pack 300 through the connection module 300 .

[0084] More specifically, the command applied by the measuring module 200 may be transmitted to the controller 130 included in the battery pack 100 through the command line 131 via the connection module 300 , and the measuring module 200 may control the controller 130 based on the command.

[0085] In operation S200, the controller 130 may control the first switch 122 included in the verification circuit 120 to be short-circuited in response to the received first command. In response to the first command, the controller 130 may control the first switch 122 to be turned ON and the second switch 123 to be turned OFF.

[0086] Because the first switch 122 is turned on and the second switch 123 is turned off, a load located between the first and second wirings 201 and 202 can be electrically connected to the first and second wirings 201 and 202 , and the battery cell 110 can be electrically separated from the first and second wirings 201 and 202 .

[0087] In operation S300 , since the load 121 is electrically connected to the first wiring 201 and the second wiring 202 , the battery pack 100 may output information on the impedance of the load 121 included in the verification circuit 120 .

[0088] The load 121 may be a resistance element and have a preset impedance.

[0089] In operation S400, the measuring module 200 may compare information about the impedance of the load 121 with a preset value to verify the reliability of the measuring system 10. Figure 4 A method for the measurement module 200 to verify the reliability of the measurement system 10 is described in detail.

[0090] In operation S500 , the measuring module 200 may transmit a second command to the battery pack 100 according to a result of the reliability verification.

[0091] The measurement module 200 may send a second command to the controller 130 through the command line 131. In operation S600, the controller 130 may control the second switch 123 included in the verification circuit 120 to short-circuit based on the received second command. Based on the second command, the controller 130 may control the second switch 123 to turn on and the first switch 122 to turn off.

[0092] Because the second switch 123 is turned on and the first switch 122 is turned off, the load located between the first and second wirings 201 and 202 can be electrically separated from the first and second wirings 201 and 202 , and the battery cell 110 can be electrically connected to the first and second wirings 201 and 202 .

[0093] In operation S700 , because the battery cell 110 is electrically connected to the first wiring 201 and the second wiring 202 , the battery pack 100 may output information about the impedance of the battery cell 110 .

[0094] The measurement module 200 may measure the impedance of the battery cell based on the information about the impedance of the battery cell 110. The measurement module 200 may calculate an impedance spectrum of the battery cell based on the information about the impedance of the battery cell 110, and compare the calculated impedance spectrum of the battery cell with an equivalent circuit module of the battery cell 110 to estimate degradation and performance of the battery cell 110.

[0095] Figure 4 is a flow chart illustrating a method of operating an impedance measurement system according to another embodiment disclosed herein.

[0096] exist Figure 4 , a method of measuring the impedance of the load 121 by the measurement module 200 included in the impedance measurement system 10 and an operation of notifying a user of a reliability verification result of the measurement system 10 are shown.

[0097] When the measurement module 200 receives information about the impedance of the load 121 from the battery pack 100 as indicated in S300 , the measurement module 200 may measure the impedance of the load 121 based on the information about the impedance of the load 121 in operation S410 .

[0098] The measurement module 200 may measure the impedance of the load 121 based on the power applied to the battery pack 100 and information about the impedance of the load 121 .

[0099] In operation S420, the measuring module 200 may determine whether the measured impedance of the load 121 and a preset value fall within a preset range.

[0100] The measurement module 200 may store the actual impedance of the load 121 , and the actual impedance may be a preset value.

[0101] When the preset value and the measured impedance of the load 121 fall within the preset range as indicated by “yes” in operation S420 , the measuring module 200 may transmit a second command to the battery pack 100 and receive information about the impedance of the battery cell 110 from the battery pack 100 in operation S500 .

[0102] When the preset value and the measured impedance of the load 121 do not fall within the preset range as indicated by “No” in operation S420 , the measurement module 200 may determine that there is a problem with the reliability of the measurement system 10 .

[0103] In operation S900, the measurement module 200 may notify the user of a problem with the reliability of the measurement system 10. The measurement module 200 may notify the user of a problem by using a visual notification device, an audible notification device, etc., and terminate the measurement of the impedance of the battery cell 110 when a problem occurs with the reliability of the measurement system 10.

[0104] Figure 5 is a block diagram of a hardware configuration of a computing system for executing an operating method of an impedance measurement system according to an embodiment disclosed herein.

[0105] Reference Figure 5 , 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 .

[0106] According to an embodiment, the computing system 1000 may be a system for performing the above-described operations of the controller 130 or the measuring module 200 .

[0107] The MCU 1010 may be a processor that executes various programs stored in the memory 1020 .

[0108] For example, the MCU 1010 may process voltage and current data of the battery cell 110, command signals, switch control signals, etc. required 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 for processing data and / or signals.

[0109] In addition, the MCU 1010 may be a processor for adjusting the current applied to the battery pack 100 for the measurement module 200 to measure the impedance of the battery cell 110 and / or the load 121, and performing impedance calculation based on information output from the battery pack 100. The MCU 1010 may be a processor for processing data and / or signals.

[0110] The memory 1020 may store various programs required for managing and controlling the battery pack 100. The memory 1020 may also store various programs required for measuring impedance.

[0111] For example, the memory 1020 may store various data of each battery cell 110, such as voltage, current, characteristic data, etc. In addition, the memory 102 may store a program for calculating impedance based on the voltage, current, characteristic data, etc. of each battery cell 110. The memory 1020 may be provided in plural as needed.

[0112] The memory 1020 may be a volatile memory or a nonvolatile 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 nonvolatile 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 merely examples and are not limited thereto.

[0113] 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 a display (not shown) to the MCU 1010 .

[0114] 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, a program or various data for impedance detection of the battery cell 110 may be transmitted to and received from a separately provided external server through the communication I / F 1040.

[0115] Thus, 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 Figures 1 to 4 Modules with the functionality shown in .

[0116] The above description is merely an illustration of the technical concept of the present disclosure, and a person skilled in the art to which the embodiments disclosed herein pertain may make various modifications and variations without departing from the essential features of the embodiments of the present disclosure.

[0117] 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 pack, comprising: at least one battery cell; a verification circuit connected to the at least one battery cell and including a load; and A controller is configured to control the verification circuit to output information about the impedance of the load in response to a first command, and to control the verification circuit to output information about the impedance of the at least one battery cell in response to a second command.

2. The battery pack according to claim 1, wherein: The verification circuit includes a first switch and a second switch, and The controller is further configured to control the second switch to be opened when the first switch is short-circuited, and to control the first switch to be opened when the second switch is short-circuited.

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

4. The battery pack according to claim 2, wherein: The controller is further configured to control the first switch to be short-circuited in response to the first command, and to control the second switch to be short-circuited in response to the second command.

5. An impedance measurement system, the impedance measurement system comprising: a battery pack including at least one battery cell and a load, and configured to output information about an impedance of the at least one battery cell or information about an impedance of the load; as well as A measurement module is configured to send different commands to the battery pack to output information from the battery pack.

6. The impedance measurement system according to claim 5, wherein: The different commands include a first command and a second command, and The measurement module is further configured to send the first command or the second command to the battery pack.

7. The impedance measurement system according to claim 6, wherein: The battery pack is further configured to output information about the impedance of the load in response to the first command, and to output the information about the impedance of the at least one battery cell in response to the second command.

8. The impedance measurement system according to claim 5, wherein: The measurement module is further configured to compare the information about the impedance of the load with a preset value to verify the reliability of the measurement system.

9. The impedance measurement system according to claim 8, wherein: The different commands include a second command, and The measurement module is further configured to send the second command to the battery pack when the reliability of the measurement system is verified.

10. The impedance measurement system according to claim 8, wherein: The measurement module is further configured to measure the impedance of the load based on the information about the impedance of the load, and determine whether the measured impedance of the load and the preset value fall within a preset range to verify the reliability of the measurement system.

11. The impedance measurement system according to claim 5, wherein: The measurement module is further configured to measure the impedance of the at least one battery cell based on the information about the impedance of the at least one battery cell.

12. The impedance measurement system according to claim 5, wherein: The measurement module includes an electrochemical impedance spectroscopy device.

13. A method for operating an impedance measurement system, the method comprising the following steps: The measurement module sends a first command to the battery pack; In response to the first command, the controller controls a first switch included in the verification circuit to be short-circuited; outputting, by the battery pack, information about an impedance of a load included in the verification circuit; The measurement module compares the information about the impedance of the load with a preset value to verify the reliability of the measurement system; The measurement module sends a second command to the battery pack according to the result of the reliability verification; In response to the second command, the controller controls a second switch included in the verification circuit to be short-circuited; outputting, by the battery pack, information about the impedance of at least one battery cell; as well as The impedance of the at least one battery cell is measured by the measurement module based on the information about the impedance of the at least one battery cell.

14. The operating method according to claim 13, wherein: The controller is further configured to control the second switch to be opened when the first switch is short-circuited, and to control the first switch to be opened when the second switch is short-circuited.

15. The operating method according to claim 14, wherein: The step of verifying the reliability of the measurement system comprises the following steps: measuring, by the measurement module, the impedance of the load based on the information about the impedance of the load; and The measuring module determines whether the measured impedance of the load and the preset value fall within a preset range.

16. The operating method according to claim 15, further comprising the following steps: When the measured impedance of the load and the preset value do not fall within the preset range, the user is notified that a reliability problem occurs in the measurement system.

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