Deterioration Detection for Non-Aqueous Electrolyte Power Storage Elements
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Solution Overview
Problem
Non-aqueous electrolyte power storage elements with two-phase reaction type active materials face degradation due to uneven lithium ion diffusion, leading to regions with no contribution to charging and discharging, which affects charge-discharge performance.
Innovation Solution
A deterioration detection system that measures direct current resistance values over two different time periods to detect the increase rates, allowing for the identification of degradation by comparing these rates and applying a potential gradient to recover performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If two-phase reaction type active material is used in the positive electrode, then the power storage element can achieve higher energy density, but lithium ions diffuse unevenly leading to regions with no contribution to charging and discharging
Solution Approach 1:
The system performs preliminary measurement of direct current resistance values at different time periods to detect deterioration before it significantly impacts performance. By measuring resistance increase rates over time and comparing them to reference values, the system can identify and address issues with inactive regions in the two-phase reaction type active material before they lead to substantial degradation of charge-discharge performance.
2Productivity
If repeated charging and discharging is performed, then the power storage element provides continuous energy storage and release, but the region with no contribution to charging and discharging gradually increases
Solution Approach 1:
The system implements a feedback mechanism where the measured direct current resistance values and their increase rates are continuously monitored and compared against reference values. When the resistance increase rate exceeds the reference threshold, the system can trigger corrective actions such as adjusting charging parameters or notifying users, thereby preventing further degradation of charge-discharge performance while maintaining continuous energy storage and release operations.
3Measurement precision
If direct current resistance value is measured over a longer time period, then the measurement captures more comprehensive deterioration trends, but the measurement time and energy consumption increase
Solution Approach 1:
The system measures direct current resistance values at two specific time periods (first and second time periods) rather than continuous monitoring. This partial measurement approach provides sufficient information to calculate the resistance increase rate and detect deterioration trends without requiring excessive measurement time. The dual-time-point measurement strategy balances measurement precision with time efficiency by capturing the essential deterioration information at strategically selected intervals.
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
Effectively detects and recovers degradation in charge-discharge performance by identifying regions with no contribution to charging and discharging, improving the overall performance of non-aqueous electrolyte power storage elements.
Implementation Method 1
measuring a direct current resistance value of the non-aqueous electrolyte power storage element
Implementation Method 2
lithium ions moving between a positive electrode and a negative electrode
Data Source
AI summary
According to an embodiment of the present invention, deterioration of a non-aqueous electrolyte power storage element is detected based on a first increase rate and a second increase rate, the first increase rate being an increase rate of a direct current resistance value obtained by measuring the non-aqueous electrolyte power storage element over a first time period, the second increase rate being an increase rate of a direct current resistance value obtained by measuring the non-aqueous electrolyte power storage element over a second time period that is longer than the first time period.