Battery Electrode Sheet Moisture Detection by Drying Weight Ratio
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Solution Overview
Problem
The existing methods for detecting the qualified rate of battery electrode sheets fail to ensure safe lithium battery production, as they do not effectively address the potential safety hazards caused by abnormal moisture content and unreasonable coating, leading to lithium plating and formation curve abnormalities.
Innovation Solution
A method involving the collection of initial and dried weights of the electrode sheets to determine a reasonable coating degree by calculating the drying difference, using a drying apparatus for a preset duration, and selecting appropriate drying times based on weight or number of sheets, while considering material attributes and storage conditions to ensure accurate moisture content assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electrode sheet is not dried sufficiently, then the detection speed is improved, but the moisture content remains abnormal leading to safety hazards
Solution Approach 1:
The electrode sheet undergoes preliminary drying treatment before detection. The drying apparatus removes excess moisture from the electrode sheet in advance, ensuring that the moisture content is within the acceptable range before the qualified rate detection is performed. This preliminary action prevents safety hazards related to abnormal moisture content while maintaining efficient detection processes.
2Productivity
If the coating process is not carefully controlled, then the production efficiency is improved, but the moisture content becomes abnormal causing lithium plating
Solution Approach 1:
The system performs qualified rate detection based on weight changes before and after drying to provide feedback on coating quality. By calculating the drying difference and comparing it against predetermined thresholds, the system identifies electrode sheets with abnormal moisture content resulting from unreasonable coating. This feedback mechanism enables quality control without significantly impacting production efficiency.
3Device complexity
If traditional detection methods are used, then the device complexity is reduced, but the ability to detect abnormal moisture content is insufficient
Solution Approach 1:
The invention replaces complex traditional moisture detection methods with a simplified weight-based detection system. By measuring the weight of the electrode sheet before and after drying, and calculating the drying difference, the system accurately determines moisture content without requiring sophisticated instrumentation. This mechanical substitution maintains low device complexity while achieving precise moisture content detection.
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 determines the qualified rate of battery electrode sheets by ensuring the moisture content is within a reasonable range, preventing both excessive and insufficient coating, thus enhancing battery safety and performance.
Implementation Method 1
drying the to-be-detected electrode sheet in a drying apparatus for a preset duration
Data Source
AI summary
A method for detecting a qualified rate of a battery electrode sheet includes collecting a first weight corresponding to a to-be-detected electrode sheet, drying the to-be-detected electrode sheet in a drying apparatus for a preset duration and collecting a second weight corresponding to the dried to-be-detected electrode sheet, and determining a detection result of the to-be-detected electrode sheet based on a ratio of a drying difference to the second weight. The drying difference is a difference between the first weight and the second weight.