Battery Tab Welding Inspection Using Multi-Strength Defect Correlation
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Solution Overview
Problem
Existing methods for inspecting welding defects in secondary battery manufacturing are inadequate for detecting all small welding defects, particularly due to reliance on tensile strength measurements alone.
Innovation Solution
A method that involves manufacturing electrode assembly samples, measuring tensile strength, torsional strength, and peeling strength of the welded portions, deriving correlations between these strengths and welding defects, and establishing reference values to determine defect presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only tensile strength measurement is used for welding defect inspection, then the inspection process is simple, but small welding defects cannot be detected
Solution Approach 1:
The patent segments the welding quality assessment into three distinct strength measurements: tensile strength, torsional strength, and peeling strength. Each measurement targets different aspects of welding quality, allowing comprehensive detection of various defect types while maintaining systematic and manageable inspection procedures for each individual test
Solution Approach 2:
The patent transitions from single-dimension tensile strength measurement to multi-dimensional assessment by adding torsional strength (rotational dimension) and peeling strength (shear dimension) measurements. This dimensional expansion enables detection of defects that remain undetected in single-dimension testing
2Reliability
If multiple strength measurements are performed, then welding defect detection accuracy is improved, but inspection time and complexity increase
Solution Approach 1:
The patent establishes predetermined reference values for tensile strength, torsional strength, and peeling strength before production. These reference values serve as quick comparison benchmarks during inspection, allowing operators to rapidly assess whether measured values indicate defects without requiring complex real-time analysis
Solution Approach 2:
The patent implements a feedback mechanism where measured strength values are compared against reference values to determine pass/fail status. This feedback loop provides immediate quality assessment, enabling rapid decision-making and maintaining high inspection efficiency while ensuring reliable defect detection
Data Source
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AI summary
The present technology relates to a method of inspecting a welding defect. The method includes: manufacturing an electrode assembly sample by welding an electrode lead on an electrode tab formed on an electrode assembly; measuring a tensile strength, a torsional strength and a peeling strength of a welded portion between the electrode tab and the electrode lead for the electrode assembly sample; deriving correlation between whether there is a welding defect and each of the tensile strength, the torsional strength, and the peeling strength; and deriving a reference value for determining whether there is a welding defect for the tensile strength, the torsional strength, and the peeling strength, respectively.