All-Solid-State Battery Abnormality Detection by Swelling Trend
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Solution Overview
Problem
Existing methods for determining the state of all-solid-state batteries are inadequate, as they do not account for the unique form of deterioration in these batteries, which can lead to rapid capacity deterioration due to unevenness in the negative electrode reaction.
Innovation Solution
A system and method that includes a detection apparatus to measure the external dimension and confining pressure of all-solid-state batteries, determining an abnormality when the fluctuation of these quantities transitions from a decreasing to an increasing trend, particularly when the ratio of current to initial values exceeds 1.05, indicating potential capacity deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a method similar to that for liquid batteries is used to determine the state of all-solid-state batteries, then the determination process is simple and familiar, but the state determination becomes inaccurate due to the different form of deterioration in all-solid-state batteries
Solution Approach 1:
The patent changes the monitoring parameters from those used in liquid batteries to specific parameters suitable for all-solid-state batteries: external dimensions (length, width, thickness) and confining pressure. These parameter changes enable accurate detection of the unique deterioration form in all-solid-state batteries while maintaining a relatively simple monitoring system.
2Quantity of substance
If the negative-electrode active material expands greatly at initial charging, then the battery capacity increases, but the fluctuation of external dimension shows a decreasing trend that may mask abnormality detection
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors the fluctuation of external dimensions and confining pressure, comparing current values with historical data to identify trend changes. When the fluctuation transitions from decreasing to increasing, the system provides feedback indicating abnormality, enabling reliable detection despite the initial expansion of the negative-electrode active material.
3Reliability
If the fluctuation of state quantity is monitored continuously, then early detection of abnormalities is enabled, but the device complexity and measurement requirements increase
Solution Approach 1:
The patent employs sensors with multi-functionality that can simultaneously measure multiple parameters (external dimensions and confining pressure) using a single integrated system. This universal approach enables continuous monitoring of state quantities while minimizing device complexity by avoiding the need for separate specialized sensors for each parameter.
Data Source
AI summary
A system includes a detection apparatus and a determination apparatus. The all-solid-state battery includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer in the stated order. The negative electrode layer includes a negative-electrode active material. The detection apparatus is configured to detect a state quantity. The state quantity includes at least one of an external dimension of the all-solid-state battery and confining pressure applied to the all-solid-state battery. The determination apparatus is configured to determine that an abnormality has occurred in the all-solid-state battery when the fluctuation of the state quantity turns to an increasing trend from a decreasing trend.