Adjustable Pressing Roll for Uniform Electrode Lamination
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Solution Overview
Problem
The challenge is to ensure uniform adhesion between electrodes in a bi-cell lithium secondary battery assembly, particularly when there are deviations in the thickness of electrode mixture layers, which can lead to non-uniform degradation and increased resistance.
Innovation Solution
A lamination apparatus with an adjustable pressing roll is designed, equipped with a thickness measurement sensor and independent pressing cylinders to apply varying pressures based on measured thickness differences, ensuring consistent adhesion across the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform pressure is applied to the entire electrode surface, then the pressing process is simple, but non-uniform adhesion occurs when electrode thickness varies
Solution Approach 1:
The pressing roll is divided into multiple independent pressing sections along the thickness direction, each capable of applying different pressing forces. This allows the pressing force to be locally adjusted according to the actual thickness of the electrode at each position, ensuring uniform adhesion across the entire electrode surface while maintaining a relatively simple pressing structure.
Solution Approach 2:
The pressing roll employs an adjustable pressing mechanism that can dynamically modify the pressing force applied to different sections of the electrode. This dynamic adjustment capability enables the system to adapt to variations in electrode thickness, transforming a static uniform pressing process into a dynamic adaptive one that maintains both simplicity and precision.
2Strength
If the pressing force is increased to ensure adhesion, then adhesion strength improves, but deformation of thin electrodes increases
Solution Approach 1:
Different pressing sections of the pressing roll can apply different pressing forces tailored to the local characteristics of the electrode. For thinner electrode sections, lower pressing forces are applied to prevent deformation, while for thicker sections or areas requiring stronger adhesion, higher pressing forces are used. This localized differentiation resolves the contradiction between achieving sufficient adhesion strength and preventing electrode deformation.
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
This solution effectively secures the adhesion force between electrodes, reducing non-uniform degradation and increasing the lifespan of the battery cell, while also improving manufacturing efficiency by preventing incorrect bi-cell placement.
Implementation Method 1
a pressing roll configured such that pressing force thereof is adjustable... pressing force applied by the first pressing cylinder and pressing force applied by the second pressing cylinder are different from each other
Implementation Method 2
prevent non-uniform force of adhesion between electrodes... secure the force of coupling between all electrodes
Data Source
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AI summary
The present invention relates to a lamination apparatus for manufacture of an electrode assembly, and more particularly to a lamination apparatus including a pressing roll configured to press electrodes constituting the electrode assembly, a rotary shaft configured to rotate the pressing roll, a pressing cylinder configured to adjust pressing force applied to the pressing roll, and a thickness measurement sensor configured to measure the thickness of one of the electrodes, whereby it is possible to secure the force of adhesion between the electrodes constituting the electrode assembly even though there is deviation in thickness between electrode mixture layers.