Lamination Gripper Position Correction for Accurate Unit Cell Measurement

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Solution Overview

Problem

The existing lamination devices face challenges with positional deviations between the lower and upper grippers, leading to inaccurate measurements and increased defect rates of unit cells due to changes in the gap between the vision unit and the unit cell, which can result in good quality cells being incorrectly identified as defective.

Innovation Solution

A lamination device equipped with a lower gripper and a liftable upper gripper, featuring calibration marks, a vision camera, and a correction driving unit to calculate and correct positional deviations, ensuring the upper gripper is within a preset allowable position range, thus preventing mismeasurement and reducing defect rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the gripper is lifted and lowered at a high speed, then productivity is improved, but the positional stability of the gripper deteriorates causing positional deviation

Engineering Contradiction:

Improvegripper operation speedVSAvoidgripper positional stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The vision device detects the actual position of the gripper and feeds back this information to the control device, which then adjusts the gripper position to correct deviations caused by high-speed operation

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces mechanical position stabilization methods with an optical detection system (vision device) and automated control system that can dynamically compensate for positional deviations without mechanical adjustments

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If the gap between the vision unit and the unit cell changes due to gripper positional deviation, then measurement accuracy deteriorates, but the device structure remains simple

Engineering Contradiction:

Improvedevice structureVSAvoidunit cell measurement accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The system transitions from a static measurement setup to a dynamic one where the vision device can detect and adapt to changing gripper positions, allowing accurate measurement despite variations in the gap distance

Inventive Principle:

Principle #15Dynamics

3Reliability

If the gripper position deviates beyond the allowable value, then the defect rate increases due to continuous mismeasurement, but maintaining precise position control increases device complexity

Engineering Contradiction:

Improvemeasurement reliabilityVSAvoidposition control system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system uses its own vision device to detect its own gripper position deviations and automatically corrects them through the control device, eliminating the need for external complex positioning mechanisms

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250100266A1Lamination Device and Control Method Thereof

Publication Date: 2025.03.27 LG ENERGY SOLUTION LTD

AI summary

The present invention discloses a lamination device and a control method thereof. The lamination device of the present invention includes a plurality of calibration marks disposed on an upper gripper, a vision camera configured to capture an image of the plurality of calibration marks, a correction driving unit connected to a lower gripper and the upper gripper to correct a height of each of the lower gripper and the upper gripper, and a control unit configured to read the plurality of calibration marks to calculate a positional deviation between an actual position of the upper gripper and a preset allowable position range, and move the lower gripper and the upper gripper to correct the positional deviation.