Secondary Battery Defect Inspection via Protrusion Pressing
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Solution Overview
Problem
Existing methods fail to precisely detect defects and short circuits in secondary battery electrode assemblies, particularly during the manufacturing process, which can lead to voltage failures, ignition, and explosions due to electrode contact.
Innovation Solution
An apparatus and method utilizing a pair of pressing jigs with protrusions to press the electrode assembly and measure current, voltage, and resistance, allowing for the detection of defects and short circuits, including internal short circuits at local portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional inspection methods are used to detect defects in electrode assemblies, then the inspection process is simple, but the detection precision of local electrode contact and separator damage is insufficient
Solution Approach 1:
The pressing surface is segmented into multiple protrusions distributed across the surface. Each protrusion acts as an independent detection point that can locally press against the electrode assembly to detect separator damage or electrode contact at specific positions, thereby improving measurement precision without requiring a completely complex system overhaul
Solution Approach 2:
The invention replaces conventional visual or electrical inspection methods with a mechanical pressing system. By applying localized mechanical pressure through protrusions and measuring the resulting electrical parameters (current, voltage, resistance), the system achieves precise detection of internal defects that were previously difficult to detect
2Measurement precision
If uniform pressing is applied to the electrode assembly, then the pressing process is simple, but the detection of local separator damage and internal short circuits is insufficient
Solution Approach 1:
Instead of uniform pressing, the pressing jig features protrusions with localized pressing capability. Each protrusion can independently apply pressure to specific locations on the electrode assembly, allowing detection of local separator damage or internal short circuits at precise positions while maintaining a relatively simple overall jig structure
Solution Approach 2:
The invention transitions from uniform two-dimensional pressing to localized three-dimensional pressing through protrusions. The protrusions extend in the vertical dimension, concentrating the pressing force on small contact areas to detect local defects that uniform pressing would miss
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
Enables precise detection of defects and short circuits in secondary battery electrode assemblies, improving safety and reliability by measuring changes in current, voltage, and resistance during the pressing process.
Implementation Method 1
a measurement unit measuring one or more of current, a voltage, and resistance of the electrode assembly when the electrode assembly is pressed by the plurality of protrusions of the pair of pressing jigs
Data Source
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AI summary
An apparatus for inspecting defects of a secondary battery having a pair of pressing jigs which press an outer surface of an electrode or a pouch accommodating the electrode assembly in directions corresponding to each other and on which a plurality of protrusions protrude from pressing surfaces and a measurement unit measuring one or more of current, a voltage, and resistance of the electrode assembly when the electrode assembly is pressed by the plurality of protrusions of the pair of pressing jigs is provided.