Battery Lamination Pressure Roller for Uniform Separator Adhesion
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Solution Overview
Problem
Conventional battery lamination processing techniques result in non-uniform adhesive force distribution, leading to reduced durability, electrolyte wettability issues, and potential short circuits due to excessive adhesion and roll deformation, which affect the quality and reliability of secondary batteries.
Innovation Solution
A battery lamination processing apparatus and method utilizing a pressure roller that presses the outer surface of the electrode laminate along its traveling direction, incorporating a pair of first pressing members and a second pressing member with separate pressing surfaces to form a sealing part on the outer surface, improving adhesive force and preventing short circuits, while maintaining precise loading intervals and positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If heating and pressing are performed through the integrated lamination roll, then the lamination processing can be completed, but excessive dispersion of adhesive force due to roll deformation occurs
Solution Approach 1:
The patent divides the integrated lamination roll into separate heating units and pressing parts. The heating unit heats the electrode and separator independently, while the pressing part applies pressure separately. This segmentation eliminates the roll deformation issue that caused adhesive force dispersion, as each component performs its function without the mechanical constraints of an integrated rolling structure.
2Strength
If the electrode laminate is pressed from the central part, then the adhesive force is highest at the center, but the adhesive force decreases toward the edges
Solution Approach 1:
The pressing part is designed to apply pressure uniformly across the entire surface area of the electrode laminate, not just at the center. This creates local quality consistency across different regions (center, edges, and intermediate areas), ensuring that adhesive force is distributed evenly throughout the laminate rather than being concentrated at the center and diminishing toward the edges.
3Strength
If excessive adhesion is applied, then the bonding strength increases, but local electrolyte wettability deterioration occurs
Solution Approach 1:
The patent independently controls the parameters of heating temperature and pressing pressure through separate units. This allows optimization of bonding strength through controlled pressing while maintaining electrolyte wettability through controlled heating, avoiding the excessive adhesion problem where increasing bonding strength inevitably degraded wettability. The decoupled parameter control enables finding an optimal balance between these two competing requirements.
4Ease of manufacture
If the separator is pressed through the integrated roll, then lamination is achieved, but the adhesive force of the outer separator is reduced due to roll crown phenomenon
Solution Approach 1:
By separating the heating function from the pressing function, the patent eliminates the roll crown phenomenon that occurs in integrated rolling systems. The pressing part can apply uniform pressure to the separator without the deformation inherent in traditional lamination rolls, maintaining adhesive force at the outer separator while still achieving effective lamination.
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 solution enhances the adhesive force of the separator, prevents electrolyte wettability deterioration, and ensures the safety of the electrode laminate by forming a sealing part on the outer surface, thereby improving the durability and space utilization of secondary batteries and preventing short circuits.
Implementation Method 1
the lamination processing of the secondary battery is an important process of increasing the density through a thermocompression bonding of the electrode and the separator
Implementation Method 2
heating via a heating unit (not shown) so that they can be adhered
Data Source
AI summary
A battery lamination processing apparatus includes a pressure roller that presses an electrode laminate, wherein the electrode laminate includes a first electrode, a second electrode, and a first separator, and wherein the pressure roller presses the outer surface of the electrode laminate along a travelling direction of the electrode laminate.