Battery Cell Casing Fold Inspection Using Magnetic Field Scanning
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Solution Overview
Problem
Existing methods for detecting defects in the folded portions of battery cell casings are inefficient, often requiring large, expensive, or time-consuming equipment, and can lead to degraded sealing performance and safety risks due to undetected cracks in the metal layer.
Innovation Solution
An apparatus and method using a magnetic field outputter to scan the folded portion, measuring properties like sheet resistance and eddy current through a pickup coil, and generating defect information based on these measurements to detect cracks without disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional defect detection methods are used, then detection capability is achieved, but device complexity and cost increase
Solution Approach 1:
The patent replaces conventional mechanical or optical inspection systems with a magnetic field-based detection system. The magnetic field outputter generates a magnetic field that interacts with the metal layer in the folded portion, and the pickup coil detects changes in the magnetic field caused by cracks or defects. This substitution of mechanical/optical methods with electromagnetic methods achieves effective defect detection while reducing device complexity and cost.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary to detect defects. Instead of directly observing or mechanically probing the folded portion, the system uses a magnetic field outputter to generate a magnetic field that penetrates the casing and interacts with the metal layer. The pickup coil then detects the magnetic field changes caused by defects, using the magnetic field as a mediator between the detection system and the defect itself.
2Reliability
If comprehensive defect detection is performed, then safety is improved, but measurement time increases
Solution Approach 1:
The patent employs periodic action by moving the magnetic field outputter and pickup coil along the folded portion in a systematic manner. The system periodically scans different sections of the folded portion, generating a magnetic field at each position and measuring the corresponding property. This periodic scanning approach ensures comprehensive defect detection across the entire folded portion while maintaining efficient measurement time through automated sequential measurement.
3Measurement precision
If magnetic field scanning is performed across multiple coordinates, then detection precision is improved, but measurement time increases
Solution Approach 1:
The patent applies dynamics by making the magnetic field outputter and pickup coil movable along the folded portion. Instead of using a static detection system, the system dynamically positions the magnetic field outputter and pickup coil at multiple coordinates across the folded portion. This dynamic scanning approach enables precise defect location identification while maintaining efficient measurement through continuous motion and automated data collection at each position.
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
Efficiently detects cracks in the folded portion of battery cell casings, reducing the risk of sealing performance degradation and safety hazards by identifying defects without the need for large or costly equipment.
Implementation Method 1
a magnetic field outputter configured to output a magnetic field to the folded portion of the casing of the battery cell
Implementation Method 2
the property according to the magnetic field may include an eddy current property of the folded portion according to the magnetic field, and the property measuring instrument may include a pickup coil having inductance for measuring the eddy current property of the folded portion according to the magnetic field
Data Source
AI summary
An apparatus for detecting a defect in a folded portion of a casing of a battery cell, the apparatus includes a magnetic field outputter configured to output a magnetic field to the folded portion of the casing of the battery cell, a property measuring instrument configured to measure a property of the folded portion according to the magnetic field, and a controller configured to generate defect information of the folded portion, based on a measurement result of the property measuring instrument.