Pouch Film Depth Inspection for In-Line Battery Pouch Molding
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Solution Overview
Problem
The existing methods for inspecting the depth of accommodation parts in pouch films for secondary batteries are time-consuming and prone to measurement errors, leading to poor work continuity and inaccurate results.
Innovation Solution
An apparatus and method that incorporates a displacement sensor to measure and inspect the depth of accommodation parts during the molding process, using a distance measuring member to calculate and compare depth values against set input values, allowing for real-time defect detection and accurate inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual inspection using ruler or vernier caliper is used, then measurement can be performed, but work time is excessive and measurement accuracy is poor
Solution Approach 1:
The patent replaces manual mechanical measurement tools (ruler, vernier caliper) with an optical measurement system using a camera and image processing. The depth measurement is performed by capturing images of the pouch and calculating depth from image coordinates, eliminating the need for physical contact measurement tools and manual operation.
Solution Approach 2:
The system performs automatic self-measurement and self-inspection of pouch depth. The camera captures images, the processor automatically calculates depth values from image coordinates, and the system compares measured values against reference values to determine pass/fail status without human intervention.
2Reliability
If inspection is performed after molding process, then defects can be detected, but work continuity is poor and productivity is reduced
Solution Approach 1:
The inspection process is performed immediately after the molding process while the pouch is still on the conveyor belt, before the pouch proceeds to subsequent manufacturing steps. This preliminary inspection allows for immediate detection of depth defects, enabling real-time quality control without interrupting the production flow.
Solution Approach 2:
The inspection system operates continuously alongside the molding process. The camera continuously captures images of pouches as they move along the conveyor, and the processor continuously analyzes these images to determine pass/fail status, maintaining uninterrupted production flow while ensuring quality control.
3Measurement precision
If manual inspection is performed, then some defects can be detected, but all accommodation parts cannot be inspected accurately
Solution Approach 1:
The patent replaces manual inspection with an automated optical measurement system. The camera captures images of all accommodation parts, and the processor automatically calculates depth values and compares them against reference values, achieving consistent and accurate inspection of every pouch without human error or fatigue.
Solution Approach 2:
The system provides immediate feedback by comparing measured depth values against pre-stored reference values. The processor determines pass/fail status based on this comparison and outputs the result, creating a closed-loop quality control system that automatically identifies and flags defective pouches.
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 solution significantly reduces work time and improves work continuity by enabling precise measurement and inspection of all accommodation parts, ensuring accurate results and preventing defective pouches from entering the assembly line.
Implementation Method 1
an inspection device configured to calculate a depth value of the accommodation part formed in the pouch film and compare the calculated depth value with a set input value so as to inspect whether defects occur, wherein the inspection device includes: a distance measuring member provided at a reference point set above the pouch film to measure each of a first measurement value that is a distance from the reference point to the pouch film connected to an upper end of the accommodation part and a second measurement value that is a distance from the reference point to a bottom surface of the accommodation part
Data Source
AI summary
An apparatus for molding a pouch, which includes: a transfer device configured to transfer a pouch film; a molding device configured to press a top surface of the pouch film to mold an accommodation part for accommodating an electrode assembly; and an inspection device configured to calculate a depth value of the accommodation part formed in the pouch film to detect defects. The inspection device includes: a distance measuring member configured to measure a first measurement value and a second measurement value, and an inspection member configured to calculate a depth value of the accommodation part by subtracting the first measurement value from the second measurement value, wherein if the calculated depth value is within a set input value range, it is determined as normal, and if the calculated depth value is out of the set input value range, it is determined as defective.