Electrode Sheet Pressing With Removable Tape for Uniform Coating
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Solution Overview
Problem
Existing electrode sheet manufacturing processes struggle with uneven application and removal of coating layers, leading to quality issues and inefficiencies in secondary battery production.
Innovation Solution
An electrode sheet manufacturing apparatus and method that applies even pressure to the coating layer using a tape on uncoated regions, facilitates easy tape removal with a heat source, and includes a sensor to control tape attachment and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a coating layer is applied onto a base material to form an electrode sheet, then the electrode sheet can be manufactured, but uneven pressure application occurs during pressing leading to quality issues
Solution Approach 1:
A tape is introduced as an intermediary element between the pressing portion and the coating layer. The tape is attached to the base material in regions where the coating layer is not formed, acting as a mediator to distribute pressing force evenly across the entire pressing surface, thereby preventing uneven pressure application and improving coating layer uniformity.
Solution Approach 2:
The tape is selectively attached only to specific regions of the base material where the coating layer is not formed, rather than covering the entire surface. This localized application allows the tape to provide structural support and even pressure distribution in uncoated areas without interfering with the coating layer in coated areas, thus improving overall pressing uniformity.
2Strength
If the coating layer is pressed to improve adhesion, then adhesive force improves, but the tape must be removed which adds process steps
Solution Approach 1:
The tape is designed with a temperature-responsive adhesive layer that undergoes a phase transition when heat is applied. The adhesive loses its bonding properties at elevated temperatures, allowing the tape to be easily removed from the base material after serving its pressing function. This thermal response mechanism enables simple tape removal through heating, improving manufacturing efficiency.
3Manufacturing precision
If the tape is attached to uncoated regions to enable even pressing, then pressure distribution improves, but tape removal becomes necessary adding process complexity
Solution Approach 1:
The tape's adhesive layer is designed to undergo a phase transition in response to heat application. After the tape serves its pressing function, a heat source is applied to the base material, causing the adhesive to lose its bonding properties and allowing the tape to be easily removed. This thermal response simplifies the removal process and reduces overall process complexity.
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
Ensures uniform coating thickness and improved adhesive force, minimizing quality degradation and rolling rate issues, enhancing the performance and consistency of electrode sheets.
Implementation Method 1
a drying portion downstream of the application portion configured to supply heat to the base material
Implementation Method 2
the removal portion configured to remove the tape from the base material... capable of easily removing a tape from a base material only by supplying a heat source
Data Source
AI summary
An electrode sheet manufacturing apparatus and a method for manufacturing an electrode sheet include a coating portion configured to apply an electrode slurry on a base material to form a coating layer, an attachment portion configured to attach a tape to the base material in a region where the coating layer is not formed, a pressing portion configured to press the coating layer and/or the tape, and a removal portion configured to remove the tape from the base material.