Ceramic-Surface Guide Roll for Uniform Electrode Back Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current collector rolls in electrode manufacturing processes experience thermal deformation due to residual heat, leading to non-uniform back surface coating thickness and defects in lithium secondary batteries.
Innovation Solution
A guide roll with a core part and surface part made of heterogeneous materials, where the surface part is formed of a material with lower thermal conductivity, such as ceramic material, to prevent thermal deformation and ensure uniform back surface coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional roll made of uniform material is used to transfer the current collector, then the roll structure is simple and easy to manufacture, but the roll undergoes thermal deformation due to residual heat of the current collector, causing non-uniform coating thickness
Solution Approach 1:
The roll is divided into two distinct parts: a core part made of metal material and a surface part made of ceramic material. This segmentation allows each part to perform its specific function - the core part provides structural support while the surface part resists thermal deformation, thereby preventing coating thickness non-uniformity without requiring complete redesign of the entire roll system
Solution Approach 2:
The roll employs composite materials by combining metal core material with ceramic surface material. This composite structure leverages the high thermal conductivity of metal for heat dissipation from the current collector while utilizing the low thermal conductivity and high temperature resistance of ceramic to prevent thermal deformation of the roll surface, ensuring uniform coating thickness
2Temperature
If the roll is made of material with high thermal conductivity to dissipate heat, then heat dissipation is improved, but the roll absorbs too much residual heat and undergoes thermal deformation
Solution Approach 1:
Different parts of the roll have different thermal properties: the core part has high thermal conductivity for heat dissipation from the current collector, while the surface part has low thermal conductivity to maintain shape stability. This local quality differentiation allows the roll to simultaneously achieve effective heat management and thermal deformation prevention
Solution Approach 2:
The composite structure combines metal material with high thermal conductivity in the core for heat dissipation and ceramic material with low thermal conductivity in the surface for shape stability. This material combination enables the roll to dissipate heat effectively while maintaining its geometric integrity under thermal conditions
3Productivity
If the transfer speed of the current collector is increased to improve productivity, then production efficiency is improved, but the temperature of the roll increases due to residual heat, causing thermal deformation
Solution Approach 1:
The segmented structure with ceramic surface part provides thermal insulation that reduces heat transfer from the high-speed moving current collector to the roll core. This allows the roll to maintain lower operating temperature even at high transfer speeds, enabling sustained high productivity without thermal deformation
Solution Approach 2:
The invention changes the thermal conductivity parameter of the roll surface by using ceramic material, which reduces the rate of heat absorption from the current collector. This parameter change allows the system to operate at higher transfer speeds with controlled roll temperature, improving productivity while preventing thermal 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
Prevents thermal deformation and ensures uniform slurry application on the back surface of the current collector, improving the appearance quality and durability of the electrode sheet.
Implementation Method 1
the surface part is formed of a material with lower thermal conductivity, such as ceramic material, to prevent thermal deformation
Data Source
AI summary
An electrode coating device includes a front surface coating part, which is provided on a traveling path of a current collector, for coating a slurry on the front surface of the current collector, a back surface coating part, which is provided on the traveling path, for coating the slurry on the back surface of the current collector passing through the front surface coating part, and a guide roll including a core part having a rotating shaft, and a surface part surrounding the core part and formed of a material different from that of the core part, and transferring the current collector in a state where the back surface of the current collector faces the back surface coating part. A guide roll is also provided.