Non-Contact Sealing Thickness Measurement for Pouch Batteries
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Solution Overview
Problem
Conventional methods for measuring the thickness of pouch-type secondary battery sealing parts are limited by contact-based techniques that can damage the sealing part and are not precise, especially when the flatness is uneven, leading to inefficiencies and increased defect rates.
Innovation Solution
A non-contact thickness measurement apparatus using a pair of confocal sensors spaced apart to measure the sealing part without physical contact, allowing continuous and precise measurement of the sealing part's thickness, preventing damage and enabling total inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a contact-based measuring probe is used to measure the thickness of the sealing part, then the measurement can be performed with simple equipment, but the probe often damages the sealing part and the measurement precision is reduced when the flatness is uneven
Solution Approach 1:
The patent replaces the mechanical contact-based measuring probe with a non-contact optical measurement system. The optical measurement unit uses light to measure the thickness of the sealing part without physical contact, thereby eliminating probe damage to the sealing part and improving measurement precision on uneven surfaces while maintaining equipment simplicity.
2Device complexity
If a contact-based measuring probe is used to measure the thickness of the sealing part, then the equipment structure is simple, but the measurement is discontinuous and extends the tact time, reducing process efficiency
Solution Approach 1:
The patent implements continuous measurement by moving the optical measurement unit along the sealing part in the formation direction. This allows uninterrupted thickness measurement across the entire sealing part, eliminating the discontinuous nature of point-by-point probe measurements and reducing tact time while maintaining simple equipment structure.
3Measurement precision
If a non-contact measuring method with a pair of sensors is used, then the measurement precision and speed are improved, but the device complexity increases
Solution Approach 1:
The patent designs the optical measurement unit with a pair of sensors that can measure thickness across different positions and orientations. This multi-functional capability allows the same measurement system to handle various sealing part configurations and battery sizes, improving measurement precision while justifying the increased device complexity through enhanced versatility.
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
The non-contact method ensures high precision and speed in measuring the sealing part's thickness, reducing defect rates and maintaining the stability and reliability of secondary batteries by avoiding contact-related damages and allowing universal application across various battery sizes.
Implementation Method 1
the sensors may include confocal sensors
Implementation Method 2
a non-contact measuring part including a pair of sensors disposed to face each other
Data Source
AI summary
The disclosure relates to apparatus for measuring the thickness of a sealing portion of a secondary battery, and the apparatus includes a non-contact measuring part including a pair of sensors disposed to face each other, and a controller detecting thickness information of the sealing part of the secondary battery, the information being collected by the non-contact measuring part, wherein the non-contact measuring part is able to measure the thickness in a non-contact manner while interposing the sealing part of the secondary battery between the pair of sensors. Furthermore, the disclosure includes a method for measuring the thickness of the sealing part of the secondary battery by using the above-described pair of sensors.