KR-102962494-B1 - METHOD AND ELECTRIC DEVICE FOR MEASURING RESISTANCE OF TARGET ELECTRODE

KR102962494B1KR 102962494 B1KR102962494 B1KR 102962494B1KR-102962494-B1

Abstract

A method and an electronic device for measuring the resistance of a target electrode are disclosed, comprising the steps of: obtaining a chart regarding the electrical conductivity of the target electrode according to a change in frequency after the target electrode has been immersed in an electrolyte for a predetermined time or longer; determining a first point and a second point of the electrical conductivity graph of the target electrode included in the chart; and measuring the resistance of the target electrode based on the first point and the second point.

Inventors

박지혜
김형석
조하나

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260508
Application Date: 20240419

Claims (10)

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 frequency change after the target electrode has been immersed in the electrolyte for a predetermined time or longer; 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 The method includes the step of measuring the resistance of the target electrode based on the first point and the second point. The above-mentioned determining step is, A method comprising the step of determining the intersection point of the first axis relating to the real component of the electric conductivity graph and the electric conductivity graph as the first point, and determining the inflection point of the electric conductivity graph according to the increase in frequency as the second point. A method for measuring the resistance of a target electrode.
In paragraph 1, The chart regarding the electrical conductivity of the above target electrode is, A first axis regarding the real component of the electrical conductivity of the above-mentioned target electrode and A second axis relating to the imaginary component of the electrical conductivity of the target electrode perpendicular to the first axis. Method for measuring the resistance of a target electrode.
In paragraph 2, The above-mentioned measuring step is, A step of measuring a first resistance based on the reciprocal value of the first electrical conductivity at the first point of the above electrical conductivity graph; and A step comprising 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. Method for measuring the resistance of a target electrode.
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, and The electronic resistance of the target electrode is the first resistance, and the ionic resistance of the target electrode is the second resistance. Method for measuring the resistance of a target electrode.
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 a threshold value, The above-mentioned target electrode further includes a step of verifying that it is a normal electrode, and The above standard battery cell is, A having at least one target electrode and immersed in an electrolyte for a predetermined time or longer, Method for measuring the resistance of a target electrode.
In paragraph 1, The electrical conductivity of the target electrode according to the above frequency change is obtained using broadband dielectric spectroscopy, Method for measuring the resistance of a target electrode.
In paragraph 1, The process of impregnating the above-mentioned target electrode is, The process involves injecting an electrolyte into the electrode holder while the target electrode is interposed within the electrode holder, and then impregnating the target electrode for a predetermined time or longer. The above electrode holder is, Cylindrical top plate; and It includes a cylindrical bottom plate having a concave portion into which the top plate can be inserted, and The inner wall of the concave portion of the lower plate above comprises polytetrafluoroethylene, and 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.
In paragraph 3, The first resistor and the second resistor are, A content of conductive material determined inversely proportional to the content of the entire active material layer of the target electrode comprising an active material, a conductive material, and a binder, A method for measuring the resistance of a target electrode.
A computer-readable, non-transient recording medium storing a program for executing the method of any one of paragraphs 1 through 8 on a server.
In an electronic device for performing a method of measuring the resistance of a target electrode, Memory for storing instructions; and It includes a processor connected to the above memory, The above processor is, After the above target electrode has been immersed in the electrolyte for a predetermined time or longer, a chart regarding the electrical conductivity of the above target electrode according to the change in frequency is obtained, and 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 It is set to measure the resistance of the target electrode based on the first point and the second point, and The processor is configured to determine the intersection point of the first axis relating to the real component of the electrical conductivity graph and the electrical conductivity graph as the first point, and to determine the inflection point of the electrical conductivity graph according to the increase in frequency as the second point. Electronic device.

Description

Method and electric device for measuring resistance of target electrode The present disclosure relates to a method for measuring the resistance of a target electrode and an electronic device for performing the same. Electrical conductivity within electrodes is one of the factors affecting battery performance, and accurately predicting electrode conductivity parameters is essential for enhancing battery model performance. For measuring the electrical conductivity of lithium-ion batteries—which exhibit high energy density, operating potential, long cycle life, and low self-discharge rate—methods primarily involve measuring the probe resistance or vertical resistance of dried electrodes. Given that actual batteries operate while immersed in an electrolyte, various studies are being conducted to accurately measure not only the electrical conductivity of the electrodes in a dry state but also in the actual operating state, and to obtain information necessary for battery operation. FIG. 1 is a diagram illustrating the configuration of a target electrode resistance measurement system according to one embodiment. FIG. 2 is a flowchart illustrating a method for measuring the resistance of a target electrode according to one embodiment. FIG. 3 is a diagram illustrating the configuration of a device for implementing a method for measuring the resistance of a target electrode according to one embodiment. FIG. 4 is a drawing for explaining the resistance of a target electrode according to one embodiment. FIG. 5 is a diagram illustrating a chart regarding the electrical conductivity of a target electrode according to one embodiment. FIG. 6 is a block diagram of an electronic device according to one embodiment. The terms used in the embodiments have been selected to be as widely used as possible, taking into account their functions in the present disclosure; however, these may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. Additionally, in specific cases, terms have been arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the relevant explanatory section. Therefore, terms used in the present disclosure should be defined not merely by their names, but based on their meanings and the overall content of the present disclosure. When a part of a specification is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. The expression "at least one of a, b, and c" described throughout the specification may include 'a alone', 'b alone', 'c alone', 'a and b', 'a and c', 'b and c', or 'a, b, and c all'. The "device" mentioned below may be implemented as a computer or portable device capable of accessing a server or other device through 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, and may include all types of handheld-based wireless communication devices such as communication base devices like IMT (International Mobile Telecommunication), CDMA (Code Division Multiple Access), W-CDMA (W-Code Division Multiple Access), and LTE (Long Term Evolution), smartphones, tablet PCs, etc. Embodiments of the present disclosure are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein. Embodiments of the present disclosure will be described in detail below with reference to the drawings. FIG. 1 is a diagram illustrating the configuration of a target electrode resistance measurement system according to one embodiment. Referring to FIG. 1, the system (101) may include a broadband dielectric spectroscopy (BDS) (200) for measuring the electrical conductivity of a target electrode and an electronic device (100) for receiving information regarding the electrical conductivity of the target electrode through the broadband dielectric spectroscopy (200) and determining the resistance of the battery cell based thereon. In this case, the target electrode may correspond to an electrode impregnated in an electrolyte for a predetermined 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 components may be included in addition to the components illustrated in FIG. 1. The electronic device (100) may each include one or more sensors for measuring parameters of a target electrode, including the electrical conductivity of the target electrode that is the subject of the resistance measurement described above,