Battery Cell Diagnosis Using Intermittent High-Stimulation Profiling
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Solution Overview
Problem
Current battery diagnosis methods face challenges in accurately diagnosing the internal state of batteries within a reasonable time frame due to the trade-off between high-level electric stimulation, which causes polarization and reduces diagnostic accuracy, and low-level stimulation, which prolongs the diagnostic process.
Innovation Solution
A battery diagnosis apparatus and method that intermittently applies high-level electric stimulation to a target cell, capturing current and voltage time series data during rest periods to generate a measurement full-cell profile, enabling estimation of negative electrode degradation states such as loading amount and loss rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If high-level electric stimulation is applied to the target cell, then the diagnostic time is shortened, but the polarization phenomenon increases and diagnostic accuracy decreases
Solution Approach 1:
The patent applies periodic intermittent stimulation instead of continuous high-level stimulation. The stimulation is applied in cycles with rest periods in between, allowing the cell to recover and minimize polarization accumulation while still achieving diagnostic goals in reduced time compared to continuous low-level stimulation.
Solution Approach 2:
The patent dynamically adjusts the stimulation level based on the cell's state. By monitoring voltage changes and adapting the stimulation intensity and duration, the system optimizes the balance between diagnostic speed and accuracy, applying higher stimulation when appropriate and reducing it when polarization becomes excessive.
2Measurement precision
If low-level electric stimulation is applied to the target cell, then the diagnostic accuracy is maintained, but the diagnostic process takes excessive time
Solution Approach 1:
The patent uses periodic intermittent stimulation to achieve both accuracy and efficiency. By alternating between stimulation phases and rest phases, the system maintains measurement precision while significantly reducing total diagnostic time compared to continuous low-level stimulation.
Solution Approach 2:
The patent strategically skips through the polarization buildup phase by using intermittent high-level stimulation followed by rest periods. This allows the system to rush through the diagnostic process faster while avoiding the accuracy-loss zone of excessive polarization.
Data Source
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AI summary
Disclosed is a battery diagnosis apparatus and a battery diagnosis method. The battery diagnosis apparatus includes a processor configured to control a stimulation application device to intermittently apply a second electric stimulation greater than a first electric stimulation to a target cell during a state change period, and a communication unit configured to obtain current time series data during the state change period and voltage time series data representing a change history of a full-cell voltage of the target cell during rest periods of the second electric stimulation applied in the state change period. The processor generates a measurement full-cell profile based on the current time series data and the voltage time series data, and analyzes the measurement full-cell profile to estimate a negative electrode loading amount.