Laminating Roller with Hotter Ends for Uniform Electrode Bonding
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Solution Overview
Problem
The adhesive strength of both ends in the full-width direction of the electrode assembly is compromised due to insufficient pressurizing and heating, leading to a thinner thickness and reduced bonding with the separator.
Innovation Solution
The electrode assembly laminating roller is designed with end portions having a higher surface temperature than the central portion, typically 10 to 30°C higher, using materials with higher thermal conductivity for the end portions to enhance adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If uniform heating and pressurizing are applied across the entire electrode assembly, then the central portion achieves sufficient adhesive strength, but the end portions suffer from insufficient heating and pressurizing due to their thinner thickness
Solution Approach 1:
The heating roller is divided into a central heating portion and end heating portions with different heating capabilities. The end heating portions provide higher surface temperature to compensate for the thinner thickness at the end portions of the electrode assembly, ensuring sufficient adhesive strength throughout the entire assembly.
2Ease of manufacture
If the heating roller uses uniform material and structure throughout, then manufacturing is simplified, but the end portions cannot achieve sufficient heating due to their thinner thickness
Solution Approach 1:
The heating roller employs different heating structures for the central and end portions. The end heating portions are designed with higher heating capacity to match the thinner electrode assembly ends, while the central portion uses standard heating. This localized differentiation ensures uniform adhesive strength across the entire assembly.
Solution Approach 2:
The heating roller is segmented into distinct functional zones: a central heating portion for the thicker central section of the electrode assembly, and end heating portions for the thinner end sections. This segmentation allows each zone to be optimized for its specific heating requirements.
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 adhesive strength of both ends in the full-width direction is improved to 85 to 95% of the central portion's strength, preventing adhesive deterioration and ensuring effective bonding.
Implementation Method 1
the surface temperature of the end portion positioned at both ends of a central portion of a laminating roller is higher than the surface temperature of the central portion
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to an electrode assembly laminating roller for laminating an electrode and a separator, wherein the laminating roller comprises a central portion; and end portions positioned at both ends of the central portion with respect to the longitudinal direction, and wherein the surface temperature of the end portion is expressed higher than the surface temperature of the central portion.