Method for measuring resistance of target electrode and electrode device for performing same

Abstract

Disclosed are a method and an electronic device for measuring the resistance of a target electrode, the method comprising the steps of: acquiring a chart related to the electrical conductivity of a target electrode according to changes in frequency after the target electrode has been immersed in an electrolyte for a predefined time or longer; determining a first point and a second point on the electrical conductivity graph of the target electrode, the graph being included in the chart; and measuring the resistance of the target electrode on the basis of the first point and the second point.

Description

Method for measuring the resistance of a target electrode and an electronic device for performing the same

[0001] The present disclosure relates to a method for measuring the resistance of a target electrode and an electronic device for performing the same.

[0002] Electrical conductivity within an electrode is one of the factors that influences battery performance. Accurately predicting electrode conductivity parameters is essential for improving battery model performance. For measuring the electrical conductivity of lithium secondary batteries, which exhibit high energy density and operating potential, long cycle life, and low self-discharge rates, methods primarily involve measuring the probe resistance of dried electrodes or the vertical resistance of dried electrodes.

[0003] Since actual batteries are operated while immersed in electrolyte, various studies are being conducted to accurately measure the electrical conductivity of electrodes in a dry state as well as in an actual operating state and to obtain information necessary for battery operation.

[0004] In an embodiment of the present specification, a technical solution is to measure electrode conductivity according to frequency change for a target electrode immersed in an electrolyte using a broadband dielectric spectroscopy (BDS), analyze a graph of electrode conductivity changing according to the frequency change, and measure the resistance of the target electrode according to resistance values ​​determined based on a specific area within the graph.

[0005] In addition, in accordance with the embodiment of the present specification, a technical solution task is to determine early whether a battery manufactured through verification of an electrode having a specific specification corresponds to a normal electrode that can operate normally in a state in which the electrode is actually immersed in an electrolyte before manufacturing a finished battery product.

[0006] The technical tasks to be achieved by this embodiment are not limited to the technical tasks described above, and other technical tasks can be inferred from the following embodiments.

[0007] A method for measuring resistance of a target electrode according to one embodiment may include: obtaining a chart regarding electrical conductivity of the target electrode according to a change in frequency after the target electrode is immersed in an electrolyte for a predetermined period of time; determining a first point of an electrical conductivity graph of the target electrode included in the chart and a second point of the electrical conductivity graph; and measuring the resistance of the target electrode based on the first point and the second point.

[0008] The chart relating to the electrical conductivity of the target electrode may include a first axis relating to the real component of the electrical conductivity of the target electrode and a second axis relating to the imaginary component of the electrical conductivity of the target electrode perpendicular to the first axis.

[0009] The determining step may include a step of determining an intersection of a first axis of a real component of the electrical conductivity graph and the electrical conductivity graph as the first point, and a step of determining an inflection point of the electrical conductivity graph according to an increase in frequency as the second point, and the measuring step may include a step of measuring a first resistance based on a reciprocal value of the first electrical conductivity at the first point of the electrical conductivity graph; and a step of measuring a second resistance based on a difference between a reciprocal value of the second electrical conductivity at the second point of the electrical conductivity graph and a reciprocal value of the first electrical conductivity at the first point.

[0010] The resistance of the target electrode is determined based on the sum of the electronic resistance of the target electrode and the ionic resistance of the target electrode, and the electronic resistance of the target electrode may be the first resistance, and the ionic resistance of the target electrode may be the second resistance.

[0011] The method further comprises: obtaining a resistance of a reference battery cell; and verifying that the target electrode is a normal electrode when the difference between the resistance of the reference battery cell and the resistance of the target electrode is less than a threshold value, wherein the reference battery cell may include at least one target electrode and be immersed in an electrolyte for a predetermined period of time.

[0012] The electrical conductivity of the target electrode according to the above frequency change can be obtained using broadband dielectric spectroscopy.

[0013] The process of impregnating the target electrode is a process of injecting an electrolyte into the electrode holder while the target electrode is interposed inside the electrode holder and then impregnating the target electrode for a predetermined period of time or longer, wherein the electrode holder includes a cylindrical upper plate; and a cylindrical lower plate having a concave portion into which the upper plate can be inserted, and the inner wall of the concave portion of the lower plate includes polytetrafluoroethylene, and the target electrode can be interposed between the upper plate and the lower plate of the electrode holder.

[0014] The above first resistance and the above second resistance can be determined inversely proportional to the content of the conductive material in the entire active material layer of the target electrode including the active material, the conductive material, and the binder.

[0015] An electronic device according to one embodiment comprises a memory storing instructions; and a processor connected to the memory, wherein the processor is configured to obtain a chart regarding electrical conductivity of the target electrode according to a change in frequency after the target electrode is immersed in an electrolyte for a predefined period of time, determine a first point of an electrical conductivity graph of the target electrode included in the chart and a second point of the electrical conductivity graph, and measure a resistance of the target electrode based on the first point and the second point.

[0016] Specific details of other embodiments are included in the detailed description and drawings.

[0017] According to the proposed embodiment, one or more of the following effects can be expected.

[0018] According to an embodiment of the present specification, electrode conductivity according to frequency change of a target electrode immersed in an electrolyte is measured using a broadband dielectric spectroscopy (BDS), and a graph of electrode conductivity changing according to the frequency change is analyzed, and the resistance of the target electrode can be measured according to resistance values ​​determined based on a specific area within the graph.

[0019] In addition, according to the embodiment of the present specification, prior to manufacturing a finished battery product, it is possible to determine early whether the manufactured battery corresponds to a normal electrode that can operate normally in a state in which the electrode having a specific specification is actually immersed in an electrolyte, thereby reducing the resources required for detecting a defective electrode.

[0020] The effects of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0021] Figure 1 is a drawing for explaining the configuration of a target electrode resistance measurement system according to one embodiment.

[0022] FIG. 2 is a flowchart illustrating a method for measuring the resistance of a target electrode according to one embodiment.

[0023] FIG. 3 is a drawing for explaining the configuration of a device for implementing a method for measuring the resistance of a target electrode according to one embodiment.

[0024] Figure 4 is a drawing for explaining the resistance of a target electrode according to one embodiment.

[0025] FIG. 5 is a drawing for explaining a chart regarding the electrical conductivity of a target electrode according to one embodiment.

[0026] Figure 6 is a block diagram of an electronic device according to one embodiment.

[0027] The terms used in the embodiments have been selected from widely used and common terms, taking into account the functions of the present disclosure. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Furthermore, in certain cases, terms may be arbitrarily selected by the applicant, in which case their meanings will be described in detail in the relevant description. Therefore, the terms used in this disclosure should not be defined simply as names of terms, but rather based on the meanings of the terms and the overall content of the present disclosure.

[0028] When a part of a specification is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

[0029] The expression "at least one of a, b, and c" described throughout the specification may encompass 'a alone', 'b alone', 'c alone', 'a and b', 'a and c', 'b and c', or 'all of a, b, and c'.

[0030] The "device" mentioned below may be implemented as a computer or portable device that can access a server or other device via a network. Here, the computer includes, for example, a notebook, desktop, or laptop equipped with a web browser, and the portable device may include, for example, a wireless communication device that ensures portability and mobility, such as a communication-based device such as IMT (International Mobile Telecommunication), CDMA (Code Division Multiple Access), W-CDMA (W-Code Division Multiple Access), LTE (Long Term Evolution), and all types of handheld-based wireless communication devices such as smartphones and tablet PCs.

[0031] Below, embodiments of the present disclosure are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present disclosure. However, the present disclosure may be implemented in various different forms and is not limited to the embodiments described herein.

[0032] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0033]

[0034] Figure 1 is a drawing for explaining the configuration of a target electrode resistance measurement system according to one embodiment.

[0035] Referring to FIG. 1, the system (101) may include a broadband dielectric spectroscopy (BDS) (200) that measures the electrical conductivity of a target electrode, and an electronic device (100) that receives information about the electrical conductivity of the target electrode through the broadband dielectric spectroscopy (200) and determines the resistance of a battery cell based on the information. In this case, the target electrode may correspond to an electrode that has been immersed in an electrolyte for a predetermined period of time or longer. Meanwhile, FIG. 1 only illustrates components related to the present embodiment. Therefore, it will be understood by those skilled in the art related to the present embodiment that other general-purpose components may be further included in addition to the components illustrated in FIG. 1.

[0036] The electronic device (100) may include one or more sensors for measuring parameters of the target electrode, including the electrical conductivity of the target electrode to be subjected to the resistance measurement described above, and may include a memory and a processor (not shown) for various operations. That is, the electronic device (100) may perform an operation in which a broadband dielectric spectroscopy (BDS) (200) obtains a chart regarding the electrical conductivity of the target electrode by applying an alternating current while changing the frequency to the target electrode, and then receives information regarding the chart through a sensor and measures the resistance of the target electrode based on the information regarding the chart. In this case, the chart regarding the electrical conductivity of the target electrode may correspond to a Nyquist plot chart. Here, the broadband dielectric spectrometer (200) and the electronic device (100) may be completely separated and independent objects as in the example illustrated in FIG. 1, but may exist only conceptually separated within a single device or system. That is, a single computing device having the function of obtaining a chart of the electrical conductivity of a target electrode by applying an alternating current while changing the frequency to the target electrode and measuring the resistance of the target electrode based on the chart may perform all the functions of the electronic device (100) described below, and therefore, such an embodiment is also considered to fall within the scope of the present disclosure.

[0037] In one embodiment, the target electrode may include an active material, a binder, and a conductive agent, and may include a plurality of target electrodes that differ only in the content of the conductive agent. For example, the target electrode may include a plurality of target electrodes that have the same type of active material and type of binder, and differ only in the content of the conductive agent in the entire electrode slurry. For example, the target electrode may be manufactured by a process of manufacturing an active material slurry including an active material, a binder, and a conductive agent, then applying the manufactured active material slurry to a metal foil, drying it, and then rolling it. In one embodiment, the target electrode may correspond to a positive electrode.

[0038] For example, the target electrode may correspond to a target electrode in which the active material accounts for 97% of the total mass of the active material layer including the active material, binder, and conductive material, the binder accounts for 2% of the total mass, and the conductive material accounts for 1% of the total mass of the active material layer of the target electrode, so that the conductive material content is 1%.

[0039] Also, for example, the target electrode may correspond to a target electrode in which the active material accounts for 97% of the total mass of the active material layer including the active material, binder, and conductive material, the binder accounts for 1%, and the conductive material accounts for 2%, so that the conductive material content of the entire active material layer of the target electrode is 2%. However, the conductive material content of the entire active material layer of the target electrode as mentioned in the embodiments according to the present disclosure is not limited to a specific case.

[0040]

[0041] FIG. 2 is a flowchart illustrating a method for measuring the resistance of a target electrode according to one embodiment.

[0042] Referring to FIG. 2, an electronic device (100) according to one embodiment can obtain a chart regarding the electrical conductivity of a target electrode according to a change in frequency after the target electrode is immersed in an electrolyte for a predefined period of time in step S210. The target electrode may be a positive electrode immersed in an electrolyte for a predefined period of time (e.g., 30 minutes).

[0043] According to one embodiment, data regarding the electrical conductivity of a target electrode can be obtained using a broadband dielectric spectroscopy (BDS). The broadband dielectric spectroscopy can measure the electrical conductivity of the target electrode according to the frequency by applying an AC current to the target electrode while changing the frequency. The electronic device (100) can obtain data regarding the electrical conductivity of the target electrode obtained by applying an AC current while changing the frequency from the broadband dielectric spectroscopy, and can obtain a chart regarding the electrical conductivity of the target electrode according to the frequency change by analyzing the data. In this case, the step of obtaining the chart regarding the electrical conductivity of the target electrode includes a process of observing a change in the electrical conductivity of the target electrode according to a change in the AC current, and specifically, may include a step of measuring the conductivity of the electrode while increasing the frequency of the AC current at a predetermined interval, thereby obtaining a chart regarding the electrical conductivity of the electrode corresponding to the frequency of the AC current. In this case, the chart regarding the electrical conductivity of the target electrode may correspond to a Nyquist plot chart. Here, the Nyquist plot chart may refer to a chart that evaluates the stability of the system through a parameter plot of the frequency response used in automatic control and signal processing. The Nyquist plot chart may refer to a chart that visualizes a graph representing a response according to a frequency change of the system on a complex plane including an axis regarding a real component and an axis regarding an imaginary component. According to one embodiment, the chart regarding the electrical conductivity of the target electrode may refer to a Nyquist plot chart, a chart that visualizes a graph representing the electrical conductivity of the target electrode according to a frequency change of an AC current applied to the target electrode on a complex plane including an axis regarding a real component and an axis regarding an imaginary component.

[0044] According to another embodiment, the electronic device (100) may measure the electrical conductivity of the target electrode according to the frequency by applying an alternating current to the target electrode while changing the frequency, and may obtain a chart regarding the electrical conductivity of the target electrode according to the frequency using the measured data.

[0045] An electronic device (100) according to an embodiment may determine a first point of a graph and a second point of the graph in step S220. An electronic device (100) according to an embodiment may determine an intersection of a first axis of a real component of an electrical conductivity graph and an electrical conductivity graph as a first point. An electronic device (100) according to an embodiment may determine an inflection point of an electrical conductivity graph according to an increase in frequency as a second point. For example, the electronic device (100) may determine a point of an electrical conductivity graph when the frequency is 100 Hz as the first point, and a point of an electrical conductivity graph when the frequency is 100 Hz as the second point. The point of the electrical conductivity graph at Hz can be determined as the second point. However, the first point and the second point according to the embodiment of the present disclosure are not limited to being determined as points of the electrical conductivity graph at a specific frequency.

[0046] An electronic device (100) according to an embodiment may measure the resistance of a target electrode based on a first point and a second point in step S230. In this case, the resistance of the target electrode may correspond to ohmic resistance, which is a resistance when the impedance has only real values ​​when analyzing a chart of the target electrode according to a change in frequency. The resistance of the target electrode may correspond to the resistance obtained by adding all resistance components appearing in the electrolyte, current collector, separator, etc. of the target electrode, and may be measured based on the characteristics of the electrolyte ionic conductivity. A circuit including the resistance component of the target electrode will be described in detail below with reference to FIG. 4.

[0047] An electronic device (100) according to one embodiment may further perform an operation of obtaining the resistance of a reference battery cell and verifying that the target electrode is a normal electrode if the difference between the resistance of the reference battery cell and the resistance of the target electrode is less than a threshold value. In this case, the reference battery cell may include at least one (e.g., two) target electrodes and may be immersed in an electrolyte for a predefined period of time.

[0048] For example, a reference battery cell may correspond to a battery cell manufactured by contacting two positive target electrodes and immersed in an electrolyte for a predefined period of time. An electronic device (100) according to an embodiment may obtain resistance through impedance analysis of a reference battery cell with a 1% conductive material content, and may verify that the target electrode is a normal electrode if the difference between the resistance of the reference battery cell with a 1% conductive material content and the resistance of the target electrode with a 1% conductive material content is less than a threshold value. Here, the reference battery cell with a 1% conductive material content may mean a battery cell in which the conductive material content of the entire active material layer of the target electrode is 1 mass%. The entire active material layer may mean an active material, a conductive material, and a binder. For example, if the resistance of the target electrode with 1% conductive material content according to the method of measuring the resistance of the target electrode according to one embodiment is about 0.22Ω and the resistance of the reference battery cell with 1% conductive material content is about 0.23Ω, the electronic device (100) determines that the difference between the resistance of the reference battery cell with 1% conductive material content and the resistance of the target electrode with 1% conductive material content is less than a threshold value, and thus verifies that the target electrode is a normal electrode having a resistance that is not significantly different from the resistance of the reference battery cell. For example, the electronic device (100) obtains the resistance through impedance analysis of the reference battery cell with 2% conductive material content, and verifies that the target electrode is a normal electrode if the difference between the resistance of the reference battery cell with 2% conductive material content and the resistance of the target electrode with 2% conductive material content is less than a threshold value. Here, the reference battery cell with 2% conductive material content may mean a battery cell in which the content of the conductive material with respect to the entire active material layer of the target electrode is 2 mass%. For example, the electronic device (100) has a resistance of about 0.063Ω of a target electrode having a 2% conductive content according to a method for measuring the resistance of a target electrode according to one embodiment, and a resistance of a reference battery cell having a 2% conductive content is about 0.If the resistance is 064Ω, it can be determined that the difference between the resistance of the reference battery cell with 2% of the conductive material content and the resistance of the target electrode with 2% of the conductive material content is less than the threshold value, and thus it can be verified that the target electrode is a normal electrode with a resistance that is not significantly different from that of the reference battery cell.

[0049]

[0050] FIG. 3 is a drawing for explaining the configuration of an electrode holder for implementing a method for measuring the resistance of a target electrode according to one embodiment.

[0051] Referring to FIG. 3, the configuration of an electrode holder for implementing a method for measuring the resistance of a target electrode can be confirmed. The method for measuring the resistance of a target electrode according to one embodiment may include a process of measuring the electrical conductivity of the target electrode using a broadband dielectric spectrometer as described above, and FIG. 3 shows the structure of an electrode holder for analyzing the electrical conductivity of a target electrode immersed in an electrolyte for a predetermined period of time or longer using the broadband dielectric spectrometer.

[0052] An electrode holder (300) used in a method for measuring the resistance of a target electrode according to one embodiment may include a cylindrical upper plate (310) and a cylindrical lower plate (320) having a concave portion into which the upper plate (310) can be inserted, and an inner wall (330) of the concave portion of the lower plate (320) may include polytetrafluoroethylene (PTFE), and the target electrode may be interposed between the upper plate (310) and the lower plate (320) of the electrode holder. That is, a wideband dielectric spectrometer may obtain information on the electrical conductivity of the target electrode by applying an alternating current while changing the frequency to the target electrode located between the upper plate (310) and the lower plate (320) of the electrode holder (300). For example, both the upper plate (310) and the lower plate (320) may include a plated (vergoldet) material, and the inner wall (330) of the concave portion of the lower plate (320) may be filled with a polytetrafluoroethylene material so that there is no direct contact between the upper plate (310) and the lower plate (320). The inner diameter and height of the upper plate (310) and the lower plate (320) may each have a length as shown in FIG. 3, and may be configured so that the electrode to be measured falls within the specifications supported by the broadband dielectric spectrometer. The process of analyzing the electrical conductivity of the target electrode according to one embodiment may include a process of placing the target electrode in the electrode holder (300), adding an electrolyte, covering the upper part of the electrode holder (300), impregnating it for a predefined period of time (e.g., 30 minutes), and then analyzing the electrical conductivity of the target electrode through the broadband dielectric spectrometer. This can prevent noise that occurs when the electrolyte is not sufficiently penetrated into the target electrode when the target electrode is impregnated for less than a predefined time.

[0053]

[0054] Figure 4 is a drawing for explaining the resistance of a target electrode according to one embodiment.

[0055] Referring to FIG. 4, a circuit (400) including a resistance component (440) of a target electrode according to one embodiment can be identified. The circuit (400) may include an inductance component (410), a membrane resistance component (420), an electronic resistance component (430), an ionic resistance component (450), and a constant phase element of solid electrolyte interphase (CPESEI) component (460) of the target electrode. In this case, the inductance component (410) of the target electrode may correspond to a parasitic impedance component, and the CPESEI component (460) may correspond to an impedance component due to the electrical characteristics of an electrical double layer generated between the upper plate (310) and the lower plate (320) of the electrode holder (300) and the foil of the target electrode due to the high conductivity of the plating material of the upper plate (310) and the lower plate (320) as examined in FIG. 3. That is, the CPESEI component (460) may correspond to a resistance component due to the electrolyte impregnated between the upper plate (310) and the lower plate (320) and the target electrode. The circuit (400) including the resistance (430) of the target electrode according to the embodiment of the present disclosure is not limited to the specific case illustrated.

[0056] In this case, the separator resistance component (420) may correspond to a resistance component generated by the separator formed between the positive and negative electrodes, and may correspond to a component that can be measured according to the thickness, structure, and mobility of ions of the separator. Since the positive and negative electrodes of the target electrode according to one embodiment may correspond to the positive electrode itself that does not include a structure separated by the separator, the separator resistance component (420) may correspond to a value close to 0, but is not limited to the specific case mentioned in the embodiment according to the present disclosure.

[0057] The resistance component (440) of the target electrode according to one embodiment may refer to a resistance component related to electrical conductivity in the target electrode. The resistance of the target electrode according to the resistance component (440) of the target electrode according to one embodiment may be measured based on the sum of the resistance of the electronic resistance component (430) of the target electrode and the resistance of the ionic resistance component (450) of the target electrode. In another embodiment, the resistance may be measured based on the sum of the resistance of the separator resistance component (420) of the target electrode. The resistance of the target electrode measured according to the resistance component (440) of the target electrode may also be measured based on the sum of the resistance of the electronic resistance component (430) of the target electrode, the resistance of the ionic resistance component (450) of the target electrode, and the resistance of the separator resistance component (420). However, the following description will be made based on a case where the resistance of the separator resistance component (420) is very small and close to 0. However, the embodiments according to the present disclosure are not limited to the specific cases mentioned.

[0058] The electronic resistance component (430) of the target electrode according to one embodiment may refer to a resistance component related to the movement of electrons in the target electrode. The electronic resistance component (430) of the target electrode according to one embodiment may be measured based on the ratio of the conductive material of the target electrode and the surface structure of the target electrode.

[0059] The ionic resistance component (450) of the target electrode according to one embodiment may refer to a resistance component related to the movement of ions in the electrical double layer that occurs between the upper plate (310) and the lower plate (320) of the electrode holder (300) and the foil of the target electrode due to the high conductivity of the plating material of the upper plate (310) and the lower plate (320) of the electrode holder (300) as examined in FIG. 3. The ionic resistance component (450) of the target electrode according to one embodiment may be measured based on the concentration and temperature of the electrolyte.

[0060]

[0061] FIG. 5 is a drawing for explaining a chart regarding the electrical conductivity of a target electrode according to one embodiment.

[0062] Referring to FIG. 5, a chart regarding electrical conductivity of a target electrode according to an embodiment can be confirmed. The chart (500) according to an embodiment may include a first axis (510) regarding a real component of electrical conductivity of the target electrode and a second axis (520) regarding an imaginary component of electrical conductivity of the target electrode perpendicular to the first axis (510). In other words, the chart (500) according to an embodiment may include a first axis (510) regarding a real component of electrical conductivity corresponding to a reciprocal of an impedance value of the target electrode at a specific frequency and a second axis (520) regarding an imaginary component of electrical conductivity corresponding to a reciprocal of an impedance value of the target electrode at a specific frequency.

[0063] An electronic device (100) according to an embodiment may determine a point corresponding to the electrical conductivity on the first axis (510) of the real component of the electrical conductivity of the graph as a first point (511), and may determine an inflection point of the graph according to an increase in frequency as a second point (512). The electronic device (100) according to an embodiment may measure a first resistance based on the first electrical conductivity at the first point (511) of the graph. More specifically, the electronic device (100) according to an embodiment may measure a first resistance, which is an electronic resistance of a target electrode, based on a reciprocal value of the corresponding first electrical conductivity at the first point (511). In other words, the electronic device (100) according to an embodiment may obtain a second resistance based on the following mathematical equation.

[0064]

[0065] In this case may correspond to the first electrical conductivity at the first point (511), may correspond to the first resistance. In this case, the first resistance may be determined inversely proportional to the content of the conductive material in the entire active material layer of the target electrode, which includes the active material, the conductive material, and the binder. In other words, as the content of the conductive material in the entire active material layer of the target electrode increases, the electrical conductivity increases, and therefore the first resistance may be inversely proportional to the content of the conductive material in the entire active material layer of the target electrode.

[0066] In one embodiment, the electronic device (100) determines a third point (513) at which the value of the second axis (520) regarding the imaginary component of the electrical conductivity of the target electrode is the largest while the graph moves from the first point (511) to the second point (512) as the frequency increases, and when the component of the first axis (510) regarding the real component of the electrical conductivity of the target electrode at the third point (513) corresponds to the average of the component of the first axis (510) regarding the real component of the electrical conductivity of the target electrode at the first point (511) and the component of the first axis (510) regarding the real component of the electrical conductivity of the target electrode at the second point (512), the second electrical conductivity satisfying, for example, the following mathematical expression 2 can be obtained.

[0067]

[0068] In this case may mean the third electrical conductivity at the third point (513) where the value of the second axis (520) regarding the imaginary component of the electrical conductivity of the target electrode is the largest while the graph moves from the first point (511) to the second point (512) as the frequency increases. can mean the first electrical conductivity at the first point, may mean the second electrical conductivity. In other words, the electronic device (100) according to one embodiment may determine the value corresponding to the diameter of the semicircle drawn by the graph of the electrical conductivity of the target electrode while the graph moves from the first point (511) to the second point (512) as the frequency increases as the second electrical conductivity, and may measure the second resistance based on the difference between the reciprocal value of the second electrical conductivity and the reciprocal value of the first electrical conductivity at the first point. The electronic device (100) according to one embodiment may obtain the second resistance, which is the ionic resistance of the target electrode, based on, for example, the following mathematical expression 3.

[0069]

[0070] In this case can mean the first electrical conductivity at the first point, may mean the second electrical conductivity, may mean a second resistance. In conclusion, the electronic device (100) according to one embodiment obtains information on the electrical conductivity of a target electrode immersed in an electrolyte for a predefined period of time or longer through a wideband dielectric spectrometer, obtains a chart (500) on the electrical conductivity of the target electrode, and then analyzes a specific point of the electrical conductivity graph included in the chart to measure the electronic resistance component and the ionic resistance component that constitute the ohmic resistance of the target electrode, thereby measuring the resistance of the target electrode.

[0071]

[0072] Figure 6 illustrates a block diagram of a server according to one embodiment.

[0073] The electronic device (100) may include, according to one embodiment, a memory (601) and a processor (602). The electronic device (100) illustrated in FIG. 6 only illustrates components related to the present embodiment. Therefore, those skilled in the art will appreciate that, in addition to the components illustrated in FIG. 6, other general-purpose components may be included. In one embodiment, the processor (602) may be included in a controller.

[0074] The processor (602) can control the overall operation of the electronic device (100) and process data and signals. The processor (602) can be composed of at least one hardware unit. In addition, the processor (602) can operate by one or more software modules generated by executing program codes stored in the memory (601). The processor (602) can include a memory, and the processor (602) can control the overall operation of the electronic device (100) and process data and signals by executing program codes stored in the memory.

[0075] The processor (602) may be configured to obtain a chart of electrical conductivity of the target electrode according to frequency change after the target electrode is immersed in the electrolyte for a predefined period of time, determine a first point of the electrical conductivity graph of the target electrode included in the chart and a second point of the electrical conductivity graph, and measure the resistance of the target electrode based on the first point and the second point.

[0076] According to an embodiment, the electronic device (100) may additionally include a transceiver for performing wired / wireless communication. The electronic device (100) may communicate with an external electronic device (e.g., the electronic device (100)) using the transceiver. The external electronic device may be a terminal or a server. In addition, the communication technologies used by the transceiver may include GSM (Global System for Mobile communication), CDMA (Code Division Multi Access), LTE (Long Term Evolution), 5G, WLAN (Wireless LAN), Wi-Fi (Wireless-Fidelity), Bluetooth (Bluetooth), RFID (Radio Frequency Identification), Infrared Data Association (IrDA), ZigBee, NFC (Near Field Communication), etc.

[0077] The server according to the above-described embodiments may include a processor, a memory for storing and executing program data, permanent storage such as a disk drive, a communication port for communicating with an external device, and a user interface device such as a touch panel, a key, a button, etc. Methods implemented as software modules or algorithms may be stored on a computer-readable recording medium as computer-readable codes or program instructions executable on the processor. Here, the computer-readable recording medium includes a magnetic storage medium (e.g., read-only memory (ROM), random-access memory (RAM), floppy disk, hard disk, etc.) and an optical reading medium (e.g., CD-ROM, DVD (Digital Versatile Disc)). The computer-readable recording medium may be distributed to computer systems connected to a network, so that the computer-readable code may be stored and executed in a distributed manner. The medium may be readable by a computer, stored in a memory, and executed by a processor.

[0078]

[0079] The present embodiment may be represented by functional block configurations and various processing steps. These functional blocks may be implemented by various hardware and / or software configurations that perform specific functions. For example, the embodiment may employ direct circuit configurations such as memory, processing, logic, look-up tables, etc., which may perform various functions under the control of one or more microprocessors or other control devices. Similarly, the present embodiment may be implemented in a programming or scripting language such as C, C++, Java, assembler, etc., including various algorithms implemented as a combination of data structures, processes, routines, or other programming configurations. Functional aspects may be implemented as algorithms that execute on one or more processors. Furthermore, the present embodiment may employ conventional techniques for electronic configuration, signal processing, and / or data processing. Terms such as "mechanism," "element," "means," and "composition" can be used broadly and are not limited to mechanical or physical structures. These terms can also encompass a series of software routines, such as those associated with a processor.

[0080] The above-described embodiments are merely examples, and other embodiments may be implemented within the scope of the claims set forth below.

Claims

1. In a method for measuring the resistance of a target electrode, A step of obtaining a chart regarding the electrical conductivity of the target electrode according to a change in frequency after the target electrode is immersed in the electrolyte for a predefined period of time; A step of determining a first point of the electrical conductivity graph of the target electrode included in the above chart and a second point of the electrical conductivity graph; and A step of measuring the resistance of the target electrode based on the first point and the second point, A method for measuring the resistance of a target electrode.

2. In paragraph 1, The chart regarding the electrical conductivity of the above target electrode is: The first axis and the real component of the electrical conductivity of the above target electrode a second axis perpendicular to the first axis and relating to the imaginary component of the electrical conductivity of the target electrode; A method for measuring the resistance of a target electrode.

3. In paragraph 2, The above decision step is, It includes a step of determining the intersection of the first axis of the real component of the electrical conductivity graph and the electrical conductivity graph as the first point, and determining the inflection point of the electrical conductivity graph according to the increase in frequency as the second point, The above measuring steps are: A step of measuring a first resistance based on the reciprocal value of the first electrical conductivity at the first point of the electrical conductivity graph; and A step of measuring a second resistance based on the difference between the reciprocal value of the second electrical conductivity at the second point of the electrical conductivity graph and the reciprocal value of the first electrical conductivity at the first point, A method for measuring the resistance of a target electrode.

4. In paragraph 3, The resistance of the above target electrode is It is determined based on the sum of the electronic resistance of the target electrode and the ionic resistance of the target electrode, The electronic resistance of the target electrode is the first resistance, and the ionic resistance of the target electrode is the second resistance. A method for measuring the resistance of a target electrode.

5. In paragraph 1, A step of obtaining the resistance of a reference battery cell; and If the difference between the resistance of the reference battery cell and the resistance of the target electrode is less than the threshold value, Further comprising a step of verifying that the target electrode is a normal electrode, The above reference battery cell is, Containing at least one target electrode and impregnated in an electrolyte for a predefined period of time, A method for measuring the resistance of a target electrode.

6. In paragraph 1, The electrical conductivity of the target electrode according to the above frequency change is obtained using broadband dielectric spectroscopy. A method for measuring the resistance of a target electrode.

7. In paragraph 1, The process of impregnating the above target electrode is as follows: A process of injecting an electrolyte into the inside of the electrode holder while the target electrode is interposed inside the electrode holder and then impregnating the target electrode for a predetermined period of time or longer. The above electrode holder, a cylindrical top plate; and It includes a cylindrical lower plate having a concave portion formed into which the upper plate can be inserted, The inner wall of the concave portion of the above lower plate comprises polytetrafluoroethylene, A method for measuring the resistance of a target electrode, wherein the target electrode is interposed between the upper plate and the lower plate of the electrode holder.

8. In paragraph 3, The above first resistor and the above second resistor are, Determined inversely proportional to the content of the conductive material for the entire active material layer of the target electrode including the active material, conductive material and binder, A method for measuring the resistance of a target electrode.

9. A non-transitory computer-readable recording medium having recorded thereon a program for executing the method of any one of clauses 1 to 8 on a server.

10. In electronic devices, memory for storing instructions; and comprising a processor connected to the above memory, The above processor, After the target electrode is immersed in the electrolyte for a predetermined period of time, a chart is obtained regarding the electrical conductivity of the target electrode according to a change in frequency, Determine the first point of the electrical conductivity graph of the target electrode included in the above chart and the second point of the electrical conductivity graph, and Set to measure the resistance of the target electrode based on the first point and the second point, Electronic devices.

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