Battery Cell Acoustic Screening for Intelligent Defect Sampling
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Solution Overview
Problem
Current methods for detecting defects in battery cells are inefficient, as they often require destructive testing or are unable to detect operational defects like Li-plating and electrolyte degradation, and random sampling can miss defective cells, leading to increased production costs and potential safety issues.
Innovation Solution
A two-stage acoustic signal-based system is deployed on battery cell manufacturing lines, using a first scanner for rapid anomaly detection and a second, high-resolution scanner for confirmation and defect identification, allowing for intelligent selection of cells for in-depth quality evaluation and control, reducing waste and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If random sampling is used for quality evaluation, then production costs are reduced, but defective cells may be missed leading to quality issues
Solution Approach 1:
The patent replaces random mechanical sampling with an acoustic field-based detection system that can non-destructively identify defective cells through acoustic signal analysis, achieving both cost reduction and improved reliability
Solution Approach 2:
The patent introduces acoustic signals as an intermediary to detect defects indirectly through the structural response of battery cells, enabling non-contact and non-destructive quality evaluation
2Measurement precision
If in-depth analysis is performed on all battery cells, then defect detection accuracy is improved, but production time and costs increase
Solution Approach 1:
The patent segments the quality evaluation process into two stages: a fast initial acoustic screening stage for all cells, and a detailed in-depth analysis stage only for suspicious cells, thereby improving both accuracy and efficiency
Solution Approach 2:
The patent applies partial action by performing comprehensive in-depth analysis only on a subset of cells identified as suspicious by the acoustic screening, rather than analyzing all cells exhaustively
3Difficulty of detecting and measuring
If destructive testing is used for quality evaluation, then defect detection capability is improved, but cell damage occurs reducing yield
Solution Approach 1:
The patent replaces destructive mechanical testing with non-destructive acoustic field-based detection, maintaining defect detection capability while preserving cell integrity and increasing yield
Solution Approach 2:
The patent uses acoustic signals as an intermediary to probe cell structure without physical contact or damage, enabling defect detection while maintaining cell usability
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
This approach effectively identifies defective cells with high confidence, minimizing unnecessary in-depth analysis of defect-free cells and preventing defective cells from entering the market, thereby improving manufacturing efficiency and reducing costs.
Implementation Method 1
systems used for monitoring and inspection of batteries based on acoustic signals
Implementation Method 2
efficient and fast battery diagnostics methods... based on acoustic signals
Data Source
AI summary
Provided is an approach for fast and efficient analysis of acoustic signals to detect anomalies in battery cells and using the results of such analysis for intelligent selection of a subset of battery cells for in-depth quality control analysis. In one aspect, a system includes a first acoustic scanner configured to scan a battery cell; determine if the battery cell is potentially anomalous or not; and send the battery cell for a high-resolution scan if the battery cell is determined to be potentially anomalous. The system further includes a second acoustic scanner configured to perform a high-resolution scan of the battery cell; and one of confirm that the battery cell is defective or to determine that the battery cell is defect-free