Battery Swelling Detection Using Surface Capacitance Sensing
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Solution Overview
Problem
Existing methods for detecting battery swelling, such as strain sensing, are inadequate due to the lack of sensitivity in metal-based thin-film sensors and the complexity and high cost of single crystal silicon-based sensors.
Innovation Solution
A capacitance sensing method using conductors arranged on the battery cell surface to measure capacitance changes, which can detect swelling through changes in conductor distance or area, utilizing a simple and cost-effective structure applicable to various battery types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If metal-based thin-film strain sensors are used for detecting battery swelling, then the device structure remains simple, but the sensitivity is insufficient to detect small strain changes
Solution Approach 1:
The patent replaces the mechanical strain sensing system with an electrical capacitance sensing system. Instead of using metal-based thin-film strain sensors that rely on mechanical deformation detection, the invention uses conductors arranged in specific patterns that detect swelling through capacitance changes. This substitution enables high-sensitivity detection of small strain changes while maintaining structural simplicity.
Solution Approach 2:
The patent changes the detection parameter from mechanical strain to electrical capacitance. By arranging conductors in specific geometric patterns (such as interdigitated or mesh patterns) on the battery surface, the system detects swelling-induced changes in capacitance values. This parameter change allows for much higher sensitivity in detecting small deformations compared to traditional strain sensors.
2Measurement precision
If thin-film single crystal silicon-based strain sensors are used, then the measurement precision improves, but the manufacturing structure becomes complicated and costly
Solution Approach 1:
The patent replaces complex mechanical strain sensing structures with simple electrical capacitance sensing structures. Instead of manufacturing delicate single crystal silicon strain sensors requiring complex semiconductor fabrication processes, the invention uses conductive materials arranged in patterns that can be manufactured using standard PCB or thin-film deposition techniques, dramatically simplifying the manufacturing structure while maintaining high sensitivity.
Solution Approach 2:
The patent employs inexpensive conductor materials and simple geometric patterns that can be manufactured at low cost. The conductor arrangement (such as printed conductive traces or simple metal patterns) replaces expensive single crystal silicon sensors, making the detection system cost-effective and suitable for mass production in consumer electronics applications.
3Measurement precision
If traditional strain sensing methods are used, then the device structure remains simple, but the detection precision is insufficient for early swelling detection
Solution Approach 1:
The patent changes the detection parameter from mechanical strain to electrical capacitance, enabling high-precision detection of early-stage swelling. The capacitance-based detection method uses conductors arranged in patterns where small changes in distance or area between conductors produce measurable capacitance variations, providing early warning of battery swelling while maintaining ease of manufacture through standard fabrication techniques.
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
The capacitance sensing method effectively detects battery swelling with high sensitivity and versatility across different battery shapes and types, offering a cost-effective solution without the limitations of previous technologies.
Implementation Method 1
measuring a capacitance change amount when an arrangement of the conductors changes
Data Source
AI summary
A method for detecting battery swelling includes: arranging conductors in a region of a battery cell to detect swelling of the battery cell; measuring a capacitance change amount when an arrangement of the conductors changes; and determining whether or not battery swelling has occurred by using a result of the measuring of the capacitance change amount.