Secondary Battery Laminate Inspection for Adhesive Defect Detection
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Solution Overview
Problem
Conventional methods struggle to accurately identify adhesive application defects during the manufacturing of secondary batteries, leading to bonding defects and reduced productivity, especially when the amount of adhesive material is minimized to lower internal resistance.
Innovation Solution
Use a laser displacement gauge to measure the displacement of the bonding surface before drying the coating material, allowing for precise identification of application defect sites by measuring the height differences between applied and defective areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of adhesive material is reduced to lower internal resistance, then battery characteristics are improved, but the accuracy of identifying application defect sites deteriorates due to increased surface roughness
Solution Approach 1:
The inspection is performed on the bonding surface before the adhesive material is fully dried and before cutting/lamination operations. By conducting the measurement at this preliminary stage when the coating material is still relatively uniform and accessible, the system can identify application defects before they are obscured by subsequent processing or roughness development
Solution Approach 2:
The patent replaces conventional optical inspection methods (CCD cameras) with a laser displacement gauge that uses laser triangulation principles. This non-contact optical measurement system can accurately detect surface height variations and identify application defects even on rough surfaces where conventional imaging methods fail
2Reliability
If conventional inspection methods are used to identify application defect sites, then bonding defects can be suppressed, but the inspection accuracy is insufficient when adhesive material amount is minimized
Solution Approach 1:
The patent replaces conventional optical inspection systems with a laser displacement gauge that measures surface topography through laser triangulation. This substitution enables accurate detection of application defects on rough surfaces by measuring height variations rather than relying on visual contrast
Solution Approach 2:
The inspection timing is changed to occur before the adhesive material is fully processed and before surface roughness increases. By measuring at this earlier parameter state, the system maintains high detection accuracy while still ensuring bonding quality
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 method significantly enhances the accuracy of identifying application defects, reduces bonding defects, and ensures efficient production of secondary battery laminates with improved battery characteristics.
Implementation Method 1
measuring a displacement of a bonding surface with a laser displacement gauge
Data Source
AI summary
The present disclosure is directed to a new technique that can sufficiently suppress bonding defects by identifying application defect sites with a high accuracy when manufacturing a secondary battery laminate including battery members which are bonded together via an adhesive material. An inspection method of the present disclosure is an inspection method used upon forming a dry material on at least one bonding surface of an electrode and a separator, through the steps of applying a coating material on the bonding surface and forming the adhesive material by drying the coating material. In this inspection method, prior to the step of forming the adhesive material, the displacement of the bonding surface to which the coating material has been applied is measured by a laser displacement gauge to identify an application defect site.