Battery Weld Resistance Inspection for Defect Sorting
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Solution Overview
Problem
Conventional cylindrical secondary batteries face limitations in reducing the resistance of the jelly-roll electrode assembly, and existing welding quality inspection methods are inadequate for precise defect detection, leading to low sorting ability and high mis-inspection rates.
Innovation Solution
A welding quality inspection apparatus and method that measure resistance values at specific points on the electrode terminal and current collector within the battery using direct contact, without applying tensile force, to identify welding defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a monitoring system combining various signals is used to detect welding defects, then defect detection is performed, but the sorting ability is low and mis-inspection rate is high
Solution Approach 1:
The patent extracts the resistance measurement function from complex signal processing and monitoring systems. By directly measuring resistance at the welding portion using a dedicated resistance measurement member, the system eliminates the need for complex signal combination methods, thereby improving both detection accuracy and reliability while reducing mis-inspection rates
Solution Approach 2:
The patent replaces complex electrical signal processing systems with a direct electrical resistance measurement approach. By measuring the actual resistance value at the welding portion through direct contact, the system substitutes complex monitoring and signal analysis with a simple, reliable resistance-based detection method that provides accurate defect identification
2Reliability
If conventional welding inspection methods are used, then welding quality is checked, but the inspection process may damage the welding portions
Solution Approach 1:
The patent replaces mechanical inspection methods (such as tensile testing or physical manipulation) with an electrical resistance measurement method. The resistance measurement member makes minimal contact to measure electrical resistance, eliminating the need for mechanical forces that could damage the welding portions while still providing reliable quality inspection
Solution Approach 2:
The resistance measurement member acts as an intermediary that indirectly assesses welding quality without directly stressing the welding joint. By measuring electrical resistance through contact points on the electrode terminal and current collector, the system evaluates welding integrity without applying damaging mechanical loads to the welded connection
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
Effectively sorts welding defects and enhances welding quality by directly measuring resistance, preventing damage to the welding portions and improving the reliability of the secondary battery production process.
Implementation Method 1
a measurement unit including a first resistance measurement member configured to measure a first resistance value by directly contacting a first measurement point and a second resistance measurement member configured to measure a second resistance value by directly contacting a second measurement point
Data Source
AI summary
Discussed is a welding quality inspection apparatus that can include a measurement unit including a first resistance measurement member to measure a first resistance value by directly contacting a first measurement point and a second resistance measurement member to measure a second resistance value by directly contacting a second measurement point; and a control unit to judge that a welding defect occurs and sorts a defective item when the first resistance value or the second resistance value obtained from the measurement unit exceeds a threshold resistance value. The first measurement point may be positioned on a first electrode terminal exposed to an outside of the secondary battery, and the second measurement point may be positioned on the welding portion of the first electrode current collector provided inside the secondary battery.