Method for measuring the resistance of a target electrode and electrode device for carrying out the method

Abstract

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

Description

Technical Field

[0001] This disclosure relates to a method and electronic device for measuring the resistance of a target electrode. Background Technology

[0002] Electrode conductivity is one of the factors affecting battery performance, and accurate prediction of electrode conductivity parameters is a necessary element for enhancing the performance of battery models. The most widely used method for measuring the conductivity of lithium secondary batteries is to measure the probe resistance or vertical resistance of the dry electrode. Lithium secondary batteries have high energy density and operating potential, long cycle life, and low self-discharge rate.

[0003] Since real-world batteries operate while being immersed in an electrolyte solution, various studies involve accurately measuring conductivity under real-world driving conditions and when the electrodes are dried, in order to obtain the information needed for battery operation. Summary of the Invention

[0004] Technical goals

[0005] The technical objective of this disclosure according to the example embodiment is to use broadband dielectric spectroscopy (BDS) to measure the conductivity of a target electrode impregnated with an electrolyte solution as the frequency changes, analyze a graph of the conductivity of the electrode as the frequency changes, and measure the resistance of the target electrode based on a resistance value determined based on a predetermined region of the graph.

[0006] Furthermore, another technical objective of this disclosure according to the example embodiments is to determine, at an early stage, whether the manufactured battery is a normal electrode that falls within the range of batteries that can operate normally while being immersed in an actual electrolyte solution by verifying the electrodes with predetermined specifications before manufacturing the complete product.

[0007] The objectives to be achieved by the exemplary embodiments of this disclosure are not limited to the objectives described above, and other objectives can be inferred from the following exemplary embodiments.

[0008] Technical solution

[0009] According to one aspect, a method for measuring the resistance of a target electrode is provided, the method comprising: acquiring a graph of the conductivity of the target electrode varying according to a frequency after the target electrode has been immersed in an electrolyte solution for a predetermined time or longer; determining a first point and a second point of the conductivity curve of the target electrode included in the graph; and measuring the resistance of the target electrode based on the first point and the second point.

[0010] A graph of the conductivity of the target electrode may include a first axis for the real part of the conductivity of the target electrode and a second axis for the imaginary part of the conductivity of the target electrode, the second axis being perpendicular to the first axis.

[0011] The determination may include: determining the intersection of the first axis for the real part of the conductivity curve and the conductivity curve as a first point, and determining the inflection point of the conductivity curve as the frequency increases as a second point, and the measurement may include: measuring a first resistance based on the reciprocal of the first conductivity at the first point of the conductivity curve, and measuring a second resistance based on the difference between the reciprocal of the second conductivity at the second point of the conductivity curve and the reciprocal of the first conductivity at the first point.

[0012] The resistance of the target electrode can be determined based on the sum of the electronic resistance and the ionic resistance of the target electrode, and the electronic resistance of the target electrode can be the first resistance, and the ionic resistance of the target electrode can be the second resistance.

[0013] The method may further include obtaining the 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, and the reference battery cell may include at least one or more target electrodes and may be immersed in an electrolyte solution for a predetermined time or longer.

[0014] The conductivity of the target electrode, which varies with frequency, can be obtained using broadband dielectric spectroscopy.

[0015] The process of impregnating the target electrode can be a process in which an electrolyte solution is injected into the electrode holder while the target electrode is inserted into the electrode holder, and the target electrode is then impregnated for a predetermined time or longer. The electrode holder may include a cylindrical upper plate and a cylindrical lower plate with a recess. The upper plate is inserted into the recess, and the inner wall of the recess of the lower plate may include polytetrafluoroethylene. The target electrode may be inserted between the upper plate and the lower plate of the electrode holder.

[0016] The first and second resistances can be determined inversely proportional to the conductive material content of the entire active material layer of the target electrode, which includes active material, conductive material, and binder.

[0017] According to another aspect, an electronic device is also provided, comprising: a memory configured to store instructions; and a processor connected to the memory, wherein the processor is configured to acquire a graph of the conductivity of the target electrode varying according to frequency after the target electrode has been immersed in an electrolyte solution for a predetermined time or longer, determine a first point and a second point of the conductivity curve of the target electrode included in the graph, and measure the resistance of the target electrode based on the first point and the second point.

[0018] Specific details of other embodiments are included in the detailed description and accompanying drawings.

[0019] Effects of the present invention

[0020] Based on the example embodiments presented herein, one or more of the following effects can be expected.

[0021] According to an exemplary embodiment of the present disclosure, broadband dielectric spectroscopy (BDS) can be used to measure the conductivity of a target electrode impregnated with an electrolyte solution as the frequency changes, analyze a graph of the conductivity of the electrode as the frequency changes, and measure the resistance of the target electrode based on a resistance value determined based on a specific region of the graph.

[0022] Furthermore, according to exemplary embodiments of this disclosure, the resources required to detect defective electrodes can be reduced because it is possible to determine at an early stage whether the manufactured battery is a normal electrode that falls within the range of batteries that can operate normally while being immersed in an actual electrolyte solution by verifying electrodes with specific specifications before manufacturing the complete product.

[0023] The effects of this disclosure are not limited to those described above, and other effects will become apparent to those skilled in the art from the following description. Attached Figure Description

[0024] Figure 1 This is a diagram illustrating the configuration of a target electrode resistance measurement system according to an example embodiment.

[0025] Figure 2 This is a flowchart describing a method for measuring the resistance of a target electrode according to an example embodiment.

[0026] Figure 3 This is a diagram illustrating the configuration of an apparatus for implementing a method for measuring the resistance of a target electrode according to an example embodiment.

[0027] Figure 4 This is a diagram used to describe the resistance of the target electrode according to an example embodiment.

[0028] Figure 5 It is a graph used to describe the conductivity of the target electrode according to the example embodiment.

[0029] Figure 6 This is a block diagram of an electronic device according to an example embodiment. Detailed Implementation

[0030] While taking into account the functionality obtained under this disclosure, terms used in the exemplary embodiments are selected from a wide range of commonly used terms, however, these terms may be replaced by other terms based on the intent of those skilled in the art, convention, the emergence of new technologies, etc. Furthermore, in certain cases, terms arbitrarily chosen by the applicant of this disclosure may be used, and in such cases, the meaning of these terms may be described in detail in the corresponding descriptive section of this disclosure. Therefore, it should be noted that the terms used herein should be interpreted based on their actual meaning and the entirety of this specification, rather than simply on their names.

[0031] Throughout the specification, when an element is referred to as “comprising” or “including” another element, the element should not be construed as excluding other elements unless otherwise specified in the description of conflict, and the element may include at least one other element.

[0032] Throughout the specification, the phrase "at least one of a, b, and c" may include "only a", "only b", "only c", "a and b", "a and c", "b and c", or "all of a, b, and c".

[0033] In this disclosure, "device" can be implemented as a computer or a portable terminal capable of accessing a server or another terminal via a network. Here, a computer can include, for example, a laptop computer, a desktop computer, and a notebook equipped with a web browser. A portable terminal can be a wireless communication device that ensures portability and mobility, and includes any type of handheld wireless communication device, such as communication-based terminals such as International Mobile Telecommunications (IMT), Code Division Multiple Access (CDMA), W Code Division Multiple Access (W-CDMA), and Long Term Evolution (LTE), smartphones, tablet PCs, etc.

[0034] In the following description, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily practice the present disclosure. The present disclosure may be embodied in many different forms and is not limited to the exemplary embodiments described herein.

[0035] In the following, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0036] Figure 1 This is a diagram illustrating the configuration of a target electrode resistance measurement system according to an example embodiment.

[0037] refer to Figure 1System 101 may include a broadband dielectric spectroscopy (BDS) 200 for measuring the conductivity of a target electrode and an electronic device 100 for receiving information about the conductivity of the target electrode via the BDS 200 and determining the resistance of a single cell based on it. In this case, the target electrode may be an electrode impregnated with an electrolyte solution for a predetermined time or longer. On the other hand, in Figure 1 Only components relevant to example embodiments are shown. Therefore, those skilled in the art will understand that, in addition to... Figure 1 In addition to the components shown, other general-purpose components may also be included.

[0038] Electronic device 100 may each include one or more sensors for measuring parameters of the target electrode (including the aforementioned conductivity of the target electrode subjected to resistance measurement), and may include a memory and processor (not shown) for various operations. That is, after BDS 200 applies alternating current to the target electrode while changing the frequency and obtains a graph of the target electrode's conductivity, electronic device 100 can receive information about this graph through the sensors and perform the operation of measuring the resistance of the target electrode. In this case, the graph of the target electrode's conductivity may correspond to a Nyquist plot. Here, BDS 200 and electronic device 100 may be as follows: Figure 1 The objects shown are completely separate from each other, but they can also be separated only conceptually and exist within a device or system. That is, a computing device capable of obtaining a graph of the conductivity of a target electrode by applying alternating current to the target electrode while changing the frequency and measuring the resistance of the target electrode can perform all the functions of the electronic device 100 described below, and therefore, such an exemplary embodiment is considered to fall within the scope of this disclosure.

[0039] According to an example embodiment, the target electrode may include an active material, a binder, and a conductive material, and may include multiple electrodes that differ only in the content of the conductive material. As an example, the target electrode may include multiple target electrodes having the same type of active material and the same type of binder, but differing in the content of the conductive material throughout the electrode slurry. As an example, the target electrode can be manufactured by preparing an active material slurry comprising the active material, binder, and conductive material, doping and drying the prepared active material slurry on a metal foil, and then performing a rolling process on it. According to an example embodiment, the target electrode may be a positive electrode.

[0040] As an example, a 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 of the active material layer and the conductive material accounts for 1% of the total mass of the active material layer, and wherein the conductive material content of the entire active material layer of the target electrode is 1%.

[0041] As another 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% of the total mass of the active material layer, and the conductive material accounts for 2% of the total mass of the active material layer, wherein the conductive material content of the entire active material layer of the target electrode is 2%. However, the exemplary embodiments of this disclosure are not limited to the above-described case in which the conductive material content of the entire active material layer of the target electrode is predetermined.

[0042] Figure 2 This is a flowchart describing a method for measuring the resistance of a target electrode according to an example embodiment.

[0043] refer to Figure 2 According to an example embodiment, the electronic device 100 can obtain a graph of the conductivity of the target electrode changing according to frequency in operation S210 after the target electrode has been immersed in an electrolyte solution for a predetermined time or longer. The target electrode may be a positive electrode immersed in an electrolyte solution for a predetermined time (e.g., 30 minutes).

[0044] According to an example embodiment, broadband dielectric spectroscopy (BDS) can be used to obtain data on the conductivity of a target electrode. BDS measures the conductivity of the target electrode according to a frequency by applying an alternating current (AC) while changing the frequency. Electronic device 100 can obtain data on the conductivity of the target electrode obtained by applying an AC while changing the frequency from the BDS, and can obtain a graph of the conductivity of the target electrode changing according to the frequency by analyzing the data. In this case, obtaining a graph of the conductivity of the target electrode may include a process of observing the change in the conductivity of the target electrode according to the change in AC, and more specifically, may include a process of measuring the conductivity of the electrode while increasing the frequency of the AC at predetermined intervals to obtain a graph of the electrode's conductivity corresponding to the frequency of the AC. In this case, the graph of the conductivity of the target electrode may correspond to a Nyquist plot. Here, a Nyquist plot may refer to a graph that evaluates the stability of a system by means of a parametric graph of the frequency response used for automatic control and signal processing. A Nyquist plot may refer to a graph that visualizes the response of the system according to a frequency change in a complex plane, which includes an axis for the real part and an axis for the imaginary part. The Nyquist plot of the conductivity of the target electrode according to the example embodiment can refer to a plot that visualizes the conductivity of the target electrode as a function of the frequency of the alternating current applied to the target electrode in a complex plane, which includes an axis for the real part and an axis for the imaginary part.

[0045] According to another example embodiment, the electronic device 100 can measure the conductivity of a target electrode according to a frequency by applying alternating current to the target electrode by changing the frequency, and use the measured data to obtain a graph of the conductivity of the target electrode according to the frequency.

[0046] According to an example embodiment, the electronic device 100 can determine a first point and a second point of a graph in operation S220. The electronic device 100 can determine the intersection of the first axis for the real part of the conductivity graph with the conductivity graph as the first point. The electronic device 100 can determine the inflection point of the conductivity graph increasing with frequency as the second point. As an example, the electronic device 100 can determine the point on the conductivity graph at a frequency of 100 Hz as the first point, and the point at a frequency of 10... 6 The point on the conductivity curve at Hz is designated as the second point. However, the first and second points according to the exemplary embodiments of this disclosure are not limited to points on the conductivity curve at a specific frequency.

[0047] According to the example embodiment, the electronic device 100 can measure the resistance of a target electrode based on a first point and a second point during operation S230. In this case, when analyzing a graph of the target electrode changing according to frequency, the resistance of the target electrode can correspond to an ohmic resistance, which is the resistance when the impedance only includes a real value. The resistance of the target electrode can correspond to the resistance obtained by adding together all the resistive components present in the electrolyte, current collector, separator, etc. of the target electrode, and can be measured based on the characteristics of the ionic conductivity of the electrolyte. Reference will be made below. Figure 4 A detailed description of the circuit, including the resistive component of the target electrode.

[0048] The electronic device 100 according to the example embodiment can also perform the operation of acquiring the resistance of the 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. In this case, the reference battery cell may include at least one (e.g., two) target electrodes and may be immersed in an electrolyte solution for a predetermined time or longer.

[0049] As an example, a reference battery cell may be a battery cell in which two positive target electrodes are manufactured in contact with each other and impregnated with an electrolyte solution for a predetermined time or longer. According to an example embodiment, the electronic device 100 can obtain the resistance by impedance analysis of a reference battery cell having a 1% conductive material content, and verify that the target electrode is a normal electrode when the difference between the resistance of the reference battery cell having a 1% conductive material content and the resistance of the target electrode having a 1% conductive material content is less than a threshold. Here, a reference battery cell having a 1% conductive material content can refer to a battery cell where the conductive material content of the entire active material layer of the target electrode is 1% by mass. The entire active material layer can refer to the active material, conductive material, and binder. As an example, when the resistance of a target electrode with a 1% conductive material content is approximately 0.22 ohms (Ω) according to the method for measuring the resistance of a target electrode according to the example embodiment is approximately 0.23 Ω, and when the resistance of a reference battery cell with a 1% conductive material content is approximately 0.23 Ω, the electronic device 100 can determine that 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 below a threshold, and verify that the target electrode is a normal electrode whose resistance does not differ significantly from that of the reference battery cell. As an example, the electronic device 100 can obtain the resistance by impedance analysis of a reference battery cell with a 2% conductive material content, and verify that the target electrode is a normal electrode when the difference between the resistance of the reference battery cell with a 2% conductive material content and the resistance of the target electrode with a 2% conductive material content is below a threshold. Here, the reference battery cell with a 2% conductive material content can refer to a battery cell whose conductive material content in the entire active material layer of the target electrode is 2% by mass. As an example, when the resistance of the target electrode with a 2% conductive material content is approximately 0.063 Ω according to an example embodiment of the method for measuring the resistance of the target electrode, and when the resistance of the reference battery cell with a 2% conductive material content is approximately 0.064 Ω, the electronic device 100 can determine that the difference between the resistance of the reference battery cell with a 2% conductive material content and the resistance of the target electrode with a 2% conductive material content is below a threshold, and verify that the target electrode is a normal electrode whose resistance does not differ significantly from that of the reference battery cell.

[0050] Figure 3 This is a diagram illustrating the configuration of an electrode holder for implementing a method for measuring the resistance of a target electrode according to an example embodiment.

[0051] refer to Figure 3 The configuration of the electrode holder used to implement the method for measuring the resistance of a target electrode can be identified. The method for measuring the resistance of a target electrode according to an example embodiment may include the process of measuring the conductivity of the target electrode using a BDS as described above, and Figure 3 The structure of an electrode holder for analyzing the conductivity of a target electrode impregnated with an electrolyte solution for a predetermined time or longer by means of BDS is shown.

[0052] The electrode holder 300 used in the method for measuring the resistance of a target electrode according to an example embodiment may include a cylindrical upper plate 310 and a cylindrical lower plate 320 with a recess. The upper plate 310 can be inserted into the recess, and the inner wall 330 of the recess of the lower plate 320 may include polytetrafluoroethylene (PTFE). The target electrode can be inserted between the upper plate 310 and the lower plate 320 of the electrode holder. That is, the BDS can obtain information about the conductivity of the target electrode by applying alternating current to the target electrode located between the upper plate 310 and the lower plate 320 of the electrode holder 300 while changing the frequency. As an example, both the upper plate 310 and the lower plate 320 may include a plated (gold-plated) material, and the inner wall 330 of the recess of the lower plate 320 may be filled with PTFE material and configured to prevent direct contact between the upper plate 310 and the lower plate 320. The inner diameter and height of each of the upper plate 310 and the lower plate 320 may have the same characteristics as... Figure 3 The lengths shown are the same and can be configured such that the electrode to be measured falls within the specifications supported by BDS. According to an example embodiment, the process of analyzing the conductivity of a target electrode may include the following steps: placing the target electrode inside an electrode holder 300 and injecting an electrolyte solution, covering the upper part of the electrode holder 300, and immersing the target electrode for a predetermined time or longer (e.g., 30 minutes) before analyzing the conductivity of the target electrode via BDS. This prevents noise that may occur when the target electrode is immersed for less than the predetermined time due to insufficient penetration of the electrolyte solution into the target electrode.

[0053] Figure 4 This is a diagram used to describe the resistance of the target electrode according to an example embodiment.

[0054] refer to Figure 4 The circuit 400, according to an example embodiment, includes a resistive component 440 of the target electrode. The circuit 400 may include an inductive component 410 of the target electrode, a separator resistive component 420, an electronic resistive component 430, an ionic resistive component, and a phase-constant element (CPESEI) component 460 of the solid electrolyte intermediate phase. In this case, the inductive component 410 of the target electrode may correspond to a parasitic impedance component, and the CPESEI component 460 may correspond to a component resulting from, as referenced... Figure 3The high conductivity of the plating material included in the upper plate 310 and lower plate 320 of the described electrode holder 300 causes an impedance component due to the electrical characteristics of the electrical double layer that occurs between the foil of the target electrode and each of the upper plate 310 and lower plate 320. That is, the CPESEI component 460 can correspond to the resistance component caused by the electrolyte solution impregnated between the target electrode and each of the upper plate 310 and lower plate 320. Figure 4 The illustrations are merely examples, and the shape of the circuit 400 including the resistor 430 with the target electrode according to the exemplary embodiments of this disclosure is not limited thereto.

[0055] In this case, the separator resistance component 420 may correspond to the resistance component that occurs due to the separator formed between the positive and negative electrodes, and may correspond to a component that can be measured based on the thickness and structure of the separator and the ion mobility. Since the positive and negative electrodes of the target electrode may correspond to the positive electrode itself excluding the structure separated by the separator, the separator resistance component 420 may correspond to a value close to 0, but the exemplary embodiments of this disclosure are not limited thereto.

[0056] The resistance component 440 of the target electrode according to the exemplary embodiment may be a resistance component related to the conductivity of the target electrode. The resistance of the target electrode measured according to the resistance component 440 of the target electrode according to the exemplary embodiment may be measured based on the sum of the resistance of the electronic resistance component 430 and the resistance of the ionic resistance component 450 of the target electrode. In another exemplary embodiment, the resistance of the target electrode 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 be measured based on the sum of the resistance of the electronic resistance component 430, the resistance of the ionic resistance component 450, and the resistance of the separator resistance component 420, but cases where the resistance of the separator resistance component 420 is significantly lower than, and close to, zero will be described below for reference. However, the exemplary embodiments of this disclosure are not limited thereto.

[0057] The electronic resistance component 430 of the target electrode according to the example embodiment may be a resistance component related to the movement of electrons within the target electrode. The electronic resistance component 430 of the target electrode according to the example embodiment may be measured based on the ratio of the conductive material of the target electrode to the surface structure of the target electrode.

[0058] According to the example embodiment, the ion resistance component 450 of the target electrode can refer to, as referenced... Figure 3The high conductivity of the plating material included in the upper plate 310 and lower plate 320 of the described electrode holder 300 relates to the resistance component associated with the movement of ions in the electrical double layer occurring between the foil of the target electrode and each of the upper plate 310 and lower plate 320. The ionic resistance component 450 of the target electrode according to the example embodiment can be measured based on the concentration and temperature of the electrolyte solution.

[0059] Figure 5 It is a graph used to describe the relationship between the conductivity of the target electrode and the example embodiment.

[0060] refer to Figure 5 A graph relating to the conductivity of a target electrode according to an example embodiment can be identified. The graph 500 according to the example embodiment may include a first axis 510 for the real part of the conductivity of the target electrode and a second axis 520 for the imaginary part of the conductivity of the target electrode, the second axis 520 being perpendicular to the first axis 510. In other words, the graph 500 according to the example embodiment may include a first axis 510 for the real part of the conductivity corresponding to the reciprocal of the impedance value of the target electrode at a predetermined frequency and a second axis 520 for the imaginary part of the conductivity corresponding to the reciprocal of the impedance value of the target electrode at a predetermined frequency.

[0061] The electronic device 100 according to the example embodiment can determine a first point 511 as the point corresponding to the conductivity on the first axis 510 of the graph for the real part, and can determine a second point 512 as the inflection point increasing with frequency. The electronic device 100 according to the example embodiment can measure a first resistance based on the first conductivity at the first point 511 of the graph. More specifically, the electronic device 100 according to the example embodiment can measure a first resistance of the electronic resistance of the target electrode based on the reciprocal of the first conductivity at the first point 511. In other words, the electronic device 100 according to the example embodiment can obtain a second resistance based on the following equation.

[0062] [Equation 1]

[0063] in this case, This can correspond to the first conductivity at the first point 511, and This can correspond to a first resistance. In this case, the first resistance can be determined inversely proportional to the conductive material content of the entire active material layer of the target electrode, which includes the active material, conductive material, and binder. In other words, since the conductivity increases with the conductive material content of the entire active material layer of the target electrode, the first resistance can be inversely proportional to the conductive material content of the entire active material layer of the target electrode.

[0064] According to the example embodiment, the electronic device 100 can determine a third point 513 at which the value of the second axis 520 for the imaginary part of the conductivity of the target electrode is maximized as the curve moves from the first point 511 to the second point 512 according to the frequency increase. And when the component of the first axis 510 for the real part of the conductivity of the target electrode at the third point 513 corresponds to the average value of the component of the first axis 510 for the real part of the conductivity of the target electrode at the first point 511 and the component of the first axis 510 for the real part of the conductivity of the target electrode at the second point 512, a second conductivity that satisfies, for example, Equation 2 below is obtained.

[0065] [Equation 2]

[0066] in this case, This can be represented by the third conductivity at the third point 513, where the value of the imaginary part of the conductivity of the target electrode is maximized as the curve moves from the first point 511 to the second point 512. It can represent the first conductivity at the first point, and The second conductivity can be represented. In other words, the electronic device 100 according to the example embodiment can determine the second conductivity as the value corresponding to the diameter of the semicircle shown in the graph of the conductivity of the target electrode as the graph moves from the first point 511 to the second point 512 according to the frequency, and can measure the second resistance based on the reciprocal of the difference between the second conductivity and the first conductivity at the first point. As an example, the electronic device 100 according to the example embodiment can obtain the second resistance, which is the ion resistance of the target electrode, based on the following equation 3.

[0067] [Equation 3]

[0068] in this case, This can represent the first conductivity at the first point. It can represent the second conductivity, and This can represent a second resistance. In summary, the electronic device 100 according to the example embodiment can obtain information about the conductivity of a target electrode impregnated in an electrolyte solution for a predetermined time or longer via a BDS, obtain a graph 500 of the conductivity of the target electrode, and measure the resistance of the target electrode by analyzing specific points on the conductivity curve included in the graph and measuring the electronic resistance component and ionic resistance component of the ohmic resistance forming the target electrode.

[0069] Figure 6 This is a block diagram of a server according to an example embodiment.

[0070] An electronic device 100 according to an example embodiment may include a memory 601 and a processor 602. Figure 6 In this document, only components relevant to exemplary embodiments are shown for electronic device 100. Therefore, those skilled in the art will understand that, in addition to… Figure 6 In addition to the components shown, other general-purpose components may also be included. The processor 602 according to the example embodiment may be included in the controller.

[0071] Processor 602 can control the overall operation of electronic device 100 and can process data and signals. Processor 602 can be configured as at least one hardware unit. Furthermore, processor 602 can be operated by at least one or more software modules created by executing program code stored in memory 601. Since processor 602 may include memory, processor 602 can control the overall operation of electronic device 100 by executing program code stored in memory 601 and processing data and signals.

[0072] The processor 602 can be configured to acquire a graph of the conductivity of the target electrode changing according to frequency after the target electrode has been immersed in an electrolyte solution for a predetermined time or longer, determine a first point and a second point of the conductivity curve of the target electrode, and measure the resistance of the target electrode based on the first point and the second point.

[0073] According to an example embodiment, electronic device 100 may further include a transceiver for wired / wireless communication. Electronic device 100 can communicate with an external electronic device (e.g., electronic device 100). The external electronic device may be a terminal or a server. Furthermore, the transceiver may use technologies such as Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), Long Term Evolution (LTE), 5G, Wireless Local Area Network (WLAN), Wi-Fi, and Bluetooth. TM Communication technologies including Radio Frequency Identification (RFID), Infrared Data Association (IrDA), ZigBee, and Near Field Communication (NFC).

[0074] The server according to the above example 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 external devices, and a user interface device such as a touch panel, buttons, and keypads. Methods implemented by software modules or algorithms can be stored as computer-readable code or program instructions executable by a processor in a computer-readable recording medium. Here, the computer-readable recording medium can be a magnetic storage medium (e.g., read-only memory (ROM), random access memory (RAM), floppy disk, or hard disk) or an optical reading medium (e.g., CD-ROM or digital versatile optical disc (DVD)). The computer-readable recording medium can be distributed across a network-connected computer system, allowing the computer-readable code to be stored and executed in a distributed manner. The medium can be read by a computer, stored in memory, and executed by a processor.

[0075] Example embodiments may be represented by functional blocks and various processing steps. These functional blocks may be implemented by various numbers of hardware and / or software configurations that perform specific functions. For example, example embodiments may employ direct circuit configurations, such as memory, processors, logic circuits, and lookup tables, which can perform various functions by controlling one or more microprocessors or other control devices. Similar elements may be implemented by software programming or software elements, example embodiments may be implemented by programming or scripting languages ​​such as C, C++, Java, and assemblers, including various algorithms implemented by combinations of data structures, procedures, routines, or other programming configurations. Functional aspects may be implemented by algorithms executed by one or more processors. Furthermore, example embodiments may employ related techniques for, for example, electronic environment setup, signal processing, and / or data processing. The terms “mechanism,” “element,” “device,” and “configuration” are used broadly and are not limited to mechanical and physical components. For example, these terms may include the meaning of a series of software routines associated with a processor.

[0076] The above example embodiments are merely examples, and other embodiments may be implemented within the scope of the appended claims.

Claims

1. A method for measuring the resistance of a target electrode, the method comprising: A graph showing the conductivity of the target electrode as a function of frequency is obtained after the target electrode has been immersed in an electrolyte solution for a predetermined time or longer. Determine the first point and the second point of the conductivity curve of the target electrode included in the graph; as well as The resistance of the target electrode is measured based on the first point and the second point.

2. The method of claim 1, wherein the graph of the conductivity of the target electrode comprises: The first axis for the real part of the conductivity of the target electrode; as well as The second axis is used for the imaginary part of the conductivity of the target electrode, and the second axis is perpendicular to the first axis.

3. The method of claim 2, wherein the determination includes determining the intersection point of the first axis of the conductivity curve for the real part with the conductivity curve as the first point, and determining the inflection point of the conductivity curve as a function of frequency as the second point, and The measurements include: The first resistance is measured based on the reciprocal of the first conductivity at the first point of the conductivity curve. as well as The second resistance is measured based on the difference between the reciprocal of the second conductivity at the second point of the conductivity curve and the reciprocal of the first conductivity at the first point.

4. The method of claim 3, wherein the resistance of the target electrode is determined based on the sum of the electronic resistance and the ionic resistance of the target electrode, and The electronic resistance of the target electrode is the first resistance, and the ionic resistance of the target electrode is the second resistance.

5. The method according to claim 1, further comprising: Obtain the resistance of a reference cell; as well as When the difference between the resistance of the reference battery cell and the resistance of the target electrode is lower than a threshold, the target electrode is verified to be a normal electrode. The reference battery cell includes at least one or more target electrodes and is immersed in the electrolyte solution for a predetermined time or longer.

6. The method of claim 1, wherein the conductivity of the target electrode, which varies with the frequency, is obtained using broadband dielectric spectroscopy.

7. The method of claim 1, wherein the process of impregnating the target electrode is a process of injecting the electrolyte solution into the electrode holder while the target electrode is inserted inside the electrode holder, and then impregnating the target electrode for a predetermined time or longer. The electrode holder includes: A cylindrical top plate; as well as A cylindrical lower plate with a recess, into which the upper plate is to be inserted. The inner wall of the recess in the lower plate comprises polytetrafluoroethylene, and The target electrode is inserted between the upper plate and the lower plate of the electrode holder.

8. The method of claim 3, wherein the first resistance and the second resistance are determined inversely proportional to the conductive material content of the entire active material layer of the target electrode, comprising active material, conductive material and binder.

9. A non-transitory computer-readable recording medium in which a program for performing the method according to any one of claims 1 to 8 on a server is recorded.

10. An electronic device, comprising: A memory configured to store instructions; as well as The processor is connected to the memory. The processor is configured as follows: A graph showing the conductivity of the target electrode as a function of frequency is obtained after the target electrode has been immersed in an electrolyte solution for a predetermined time or longer. Determine the first point and the second point of the conductivity curve of the target electrode included in the graph; as well as The resistance of the target electrode is measured based on the first point and the second point.

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