Battery Surface Capacitance Sensing for Swelling and Moisture Detection
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Solution Overview
Problem
Lithium batteries face safety issues due to water vapor accumulation and deformation, which can lead to internal shorts, fires, or explosions, necessitating effective safety testing to prevent such incidents.
Innovation Solution
A battery safety testing apparatus utilizing capacitive sensing with inductive capacitance portions and a signal processing unit to measure shape changes and water content, distinguishing between shape deformation and water content changes through inconsistent or consistent capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional safety testing methods are used for lithium batteries, then the testing process is simple, but the detection capability for water vapor and deformation is insufficient
Solution Approach 1:
The capacitive sensing apparatus is divided into multiple inductive capacitance portions (first, second, third portions) positioned at different locations on the battery surface. Each portion independently measures capacitance changes, enabling localized detection of deformation and water vapor distribution across different battery regions.
Solution Approach 2:
The capacitive sensing apparatus serves multiple functions: it detects both battery deformation (through capacitance changes caused by shape changes) and water vapor content (through capacitance changes caused by dielectric constant variations). This single apparatus handles both safety monitoring tasks that would traditionally require separate testing systems.
2Measurement precision
If capacitive sensing apparatus with multiple inductive capacitance portions is used, then the detection precision for shape change and water content is improved, but the device complexity increases
Solution Approach 1:
Multiple inductive capacitance portions are integrated into a single capacitive sensing apparatus that connects to one signal processing apparatus. This consolidation allows the system to process multiple measurement channels through a unified processing unit, reducing overall system complexity while maintaining high detection precision across multiple battery locations.
Solution Approach 2:
The signal processing apparatus acts as an intermediary that receives capacitance data from multiple inductive capacitance portions and processes this information to distinguish between shape changes and water vapor content changes. This mediator component simplifies the complexity by providing a centralized processing mechanism rather than requiring separate processing for each sensor.
3Reliability
If the capacitive sensing apparatus measures both shape change and water content, then the safety monitoring capability is improved, but the difficulty of distinguishing between the two factors increases
Solution Approach 1:
The system employs inductive capacitance portions positioned at different locations on the battery surface, each experiencing different conditions during deformation versus water vapor infiltration. By analyzing the spatial distribution pattern of capacitance changes across these localized measurement points, the signal processing apparatus can distinguish between shape changes (which affect all portions uniformly) and water vapor content (which creates localized variations).
Solution Approach 2:
The signal processing apparatus continuously monitors capacitance changes from multiple inductive capacitance portions and uses feedback analysis to distinguish between shape changes and water vapor content. By comparing the temporal and spatial patterns of capacitance variations, the system can identify whether changes are caused by deformation or water vapor, improving safety monitoring reliability.
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 apparatus effectively measures and detects shape changes and water content, enabling early detection of potential safety hazards and preventing lithium battery failures like internal shorts, fires, or explosions.
Implementation Method 1
a capacitive sensing apparatus, where the capacitive sensing apparatus includes one or more inductive capacitance portions... when the shape change occurs and/or the water content changes, an inductive capacitance measured by the inductive capacitance portion changes
Data Source
AI summary
A battery safety testing apparatus includes a capacitive sensing apparatus and a signal processing apparatus, where the signal processing apparatus is connected to the capacitive sensing apparatus to obtain a changed inductive capacitance from the capacitive sensing apparatus. The capacitive sensing apparatus includes one or more inductive capacitance portions, the capacitive sensing apparatus is disposed on or close to a surface of the battery, and when the shape change occurs and/or the water content changes, an inductive capacitance measured by the inductive capacitance portion changes. The signal processing apparatus is further configured to measure, based on the inductive capacitance, the shape change of the battery and/or the water content of the surroundings of the battery.