Electrode Drying Roll Layout to Minimize Slurry Component Migration
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Solution Overview
Problem
During the drying process of electrode slurry application in secondary batteries, components of the electrode migrate undesirably, leading to weakened bonding forces between the coating layer and the electrode foil due to misalignment.
Innovation Solution
A facility for manufacturing electrodes that employs a two-stage drying process using a heating roll and a separate drying unit, incorporating conduction, radiation, and induction heating modules to control temperature gradients and minimize component migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single drying process is used, then the drying speed is fast, but component migration occurs and bonding force weakens
Solution Approach 1:
The drying process is divided into two distinct stages: a first drying process at a lower temperature to remove free water, and a second drying process at a higher temperature to remove bound water. This segmentation prevents component migration by controlling the drying rate at each stage, thereby maintaining component alignment while achieving complete drying.
Solution Approach 2:
The drying temperature is varied through two distinct stages: a first drying process at a lower temperature (e.g., 50-80°C) and a second drying process at a higher temperature (e.g., 80-120°C). This parameter change allows controlled removal of water at different rates, preventing migration while ensuring complete drying.
2Productivity
If high temperature is applied during drying, then drying efficiency is improved, but component migration increases
Solution Approach 1:
A first drying process is performed at a lower temperature before the second drying process at higher temperature. This preliminary action removes free water gently, preparing the coating layer for the subsequent high-temperature drying without causing component migration.
Solution Approach 2:
The drying temperature is changed in two stages: first at a lower temperature to remove free water, then at a higher temperature to remove bound water. This parameter change sequence achieves high drying efficiency while preventing component migration by controlling the thermal stress at each stage.
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 facility effectively dries the electrode sheet while maintaining strong bonding between the coating layer and the electrode foil, enhancing the manufacturing process efficiency and quality.
Implementation Method 1
The conduction heating module may be configured to generate heat through ohmic heating when a current is applied, and to heat the heating roll contact surface through thermal conduction.
Implementation Method 2
The conduction heating module may be configured to generate heat through ohmic heating when a current is applied, and to heat the heating roll contact surface through thermal conduction.
Implementation Method 3
The roll heating unit may include a radiation heating module disposed to face the heating roll contact surface and configured to emit infrared rays.
Implementation Method 4
The induction heating module may be configured to generate and supply a time-varying magnetic flux to the heating roll when an alternating current is applied. The heating roll may be heated upon application of the time-varying magnetic flux.
Data Source
AI summary
Disclosed is a facility for manufacturing electrodes. According to an embodiment of the present disclosure, the facility for manufacturing electrodes may a heating roll which includes a heating roll shaft extending in a longitudinal direction and a heating roll contact surface rotatably coupled to the heating roll shaft about the heating roll shaft; a slot die disposed to face the heating roll while being spaced apart therefrom, and configured to dispense a slurry; a roll heating unit configured to heat the heating roll contact surface; and an electrode drying unit which includes a drying housing and a heater positioned inside the drying housing.