Roller Cooling Line Layout for Uniform Electrode Pressing
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Solution Overview
Problem
Roller expansion due to thermal gradients during the roll pressing process in manufacturing lithium-ion battery electrodes leads to non-uniform capacity density distribution.
Innovation Solution
A roll pressing device with separate cooling lines on both sides of the roller shaft, featuring diffusion, cooling, and convergence passages that dissipate frictional heat, maintaining uniform temperature and preventing non-uniform expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cooling line is used to cool the roller, then the structure is simple, but thermal gradients cause non-uniform expansion and deviation from designed process conditions
Solution Approach 1:
The cooling line is divided into a first cooling line and a second cooling line positioned on opposite sides of the roller. This segmentation allows independent cooling of different roller regions, preventing thermal gradients and non-uniform expansion, thereby maintaining manufacturing precision while managing device complexity.
2Temperature
If cooling lines are positioned close to the roller surface, then cooling efficiency is high, but the risk of overheating adjacent components increases
Solution Approach 1:
The cooling lines are positioned at specific distances from the roller surface (5mm-15mm) to optimize local cooling effectiveness. This localized cooling approach maintains roller surface temperature control while preventing overheating of adjacent components by avoiding excessive proximity to the roller surface.
3Productivity
If the roller operates at high speed, then productivity increases, but frictional heat generation increases causing roller expansion
Solution Approach 1:
The cooling lines provide continuous cooling throughout the roller rotation, with coolant flowing continuously through the cooling passages. This continuous cooling action counteracts the continuous frictional heat generation during high-speed operation, maintaining temperature control and enabling sustained high productivity.
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 capacity density distribution by effectively managing thermal gradients, thereby enhancing the pressing process efficiency and electrode substrate quality.
Implementation Method 1
The volume of the roller may expand due to the frictional heat generated between a roller shaft and a bearing and the frictional heat generated between the roller surface and the surface of the substrate
Implementation Method 2
The volume of the roller may expand due to the frictional heat generated between a roller shaft and a bearing and the frictional heat generated between the roller surface and the surface of the substrate
Implementation Method 3
a pair of cooling lines through which a coolant passes, with a shaft configured to drive the roller
Data Source
AI summary
A roll pressing device may include a roller configured to pressurize a substrate provided with an active material, and provided with a pair of cooling lines through which a coolant circulates, respectively, a shaft supported by a bearing and configured to drive the roller, a pair of supply lines provided on both sides of the shaft and configured to supply the coolant to the pair of cooling lines, respectively, and a pair of discharge lines provided on the both sides of the shaft and configured to discharge the coolant having cooled the roller from the pair of cooling lines, respectively, where the pair of cooling lines are separated from each other.