Symmetrical Solid-State Battery Cell for SOC Signal Analysis
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Solution Overview
Problem
Current methods for evaluating all-solid-state battery performance are inadequate, lacking standardized techniques to accurately measure and analyze electrochemical signals related to the state of charge (SOC) of electrodes, which hinders the identification of defective products and affects the reliability of these batteries.
Innovation Solution
An all-solid-state battery analysis system and method that utilizes a cylindrical body member with conductive members and an SOC control unit to stabilize the electrochemical signal measurement by controlling the state of charge (SOC) through controlled polarity application and current application, allowing for symmetrical cell construction without disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference electrode is inserted into the all-solid-state battery to measure electrochemical signals, then the measurement capability is improved, but structural distortion occurs and the electrochemical signal is affected by contamination
Solution Approach 1:
A symmetrical cell is introduced as an intermediary measurement system. The symmetrical cell contains two identical electrodes and allows electrochemical signal measurement without inserting a reference electrode into the original battery structure, thereby avoiding structural distortion and contamination while enabling accurate SOC-based signal analysis
2Measurement precision
If the all-solid-state battery is disassembled to analyze electrode characteristics, then the analysis accuracy is improved, but the device complexity and difficulty of operation increase
Solution Approach 1:
The symmetrical cell is constructed with predetermined electrode configurations and connections before measurement. The cell is prepared in advance with two identical electrodes properly assembled, allowing direct measurement of electrode characteristics at different SOC levels without requiring disassembly of the original battery
3Ease of operation
If the state of charge (SOC) is not controlled during measurement, then the measurement process is simplified, but the measurement precision and reliability of SOC-based signals deteriorate
Solution Approach 1:
The measurement process is structured to periodically charge and discharge the symmetrical cell to achieve different SOC levels (0%, 50%, 100%). At each SOC level, electrochemical impedance spectroscopy measurements are performed systematically, ensuring both operational structure and high measurement precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables stable and accurate measurement of electrochemical signals based on SOC, facilitating the detection of defects and improving the reliability and performance evaluation of all-solid-state batteries.
Implementation Method 1
a solid electrolyte layer positioned between the first electrode layer and the second electrode layer
Implementation Method 2
The charging and discharging reactions directly lead to the diffusion reaction of lithium ions in the solid
Implementation Method 3
a cylindrical body member having a first cavity extending therethrough in a vertical direction and a second cavity extending therethrough in a horizontal direction and communicating with the first cavity
Data Source
AI summary
The present disclosure relates to an all-solid-state battery analysis system capable of reliably obtaining an electrochemical signal according to the degree of charge of an electrode, and an all-solid-state battery analysis method using the same. The system may include a body member, of cylindrical shape, having a first cavity extending therethrough in a vertical direction and a second cavity extending therethrough in a horizontal direction and communicating with the first cavity. The system may include a first conductive member including a first base having a plate shape and a first protrusion protruding from the first base having a shape corresponding to a shape of the first cavity; and a second conductive member including a second base having a plate shape and a second protrusion protruding from the second base and having a shape corresponding to the shape of the first cavity.