Battery Cell Diagnosis Using Intermittent High-Level Stimulation
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Solution Overview
Problem
Existing battery diagnosis methods face challenges in accurately diagnosing the internal state of batteries without disassembly, particularly due to the trade-off between diagnostic accuracy and time required, as high-level electric stimulation causes polarization, while low-level stimulation extends the diagnostic time.
Innovation Solution
A battery diagnosis apparatus and method that intermittently applies high-level electric stimulation to a target cell, generating current and voltage time series data to estimate a negative electrode scale factor and diagnose deterioration, thereby reducing diagnostic time while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If high-level electric stimulation is applied to the battery, then diagnostic time is reduced, but polarization occurs causing decreased measurement precision
Solution Approach 1:
The patent applies periodic action by using pulsed electric stimulation instead of continuous stimulation. The stimulation is applied in intervals with rest periods between pulses, allowing the battery to recover and minimize polarization effects while still achieving rapid data collection during the active stimulation phases.
Solution Approach 2:
The patent implements dynamics by adaptively adjusting stimulation parameters based on real-time battery response. The system dynamically modifies stimulation intensity and timing based on measured voltage and current responses, optimizing the balance between speed and accuracy during the diagnostic process.
2Measurement precision
If low-level electric stimulation is applied to the battery, then measurement precision is maintained, but diagnostic time increases excessively
Solution Approach 1:
The system uses periodic high-level stimulation pulses separated by rest periods, combining the speed advantage of high-level stimulation with the accuracy benefit of recovery time. This allows rapid data collection while maintaining measurement precision through intermittent application.
Solution Approach 2:
The patent applies skipping by rapidly collecting data during brief stimulation pulses, then skipping to rest periods for recovery. This rush-through approach during active stimulation phases enables fast diagnostics without sustaining continuous high-level stimulation that would cause 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 given 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 scale factor.