Multi-Roll Calendering for Dry Electrode Density and Adhesion
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Solution Overview
Problem
Existing dry electrode manufacturing processes for energy storage devices are inefficient and costly, requiring high shear and pressure, large equipment footprints, and complex factory setups, which hinder the production of high-quality, thin, and thick films with precise control over density and adhesiveness.
Innovation Solution
A multi-roll calendering system with individually controlled rolls and adjustable speeds, allowing for continuous production of dry electrode films without the need for self-supporting films, combined with a laminator for direct lamination onto current collectors, reducing equipment complexity and improving film adherence and density control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high shear and pressure are used in existing dry electrode manufacturing processes, then material density is improved, but equipment complexity and factory setup complexity increase
Solution Approach 1:
The patent changes the physical parameters of the calendering process by using multiple rolls with different rotational velocities to create variable shear and pressure conditions. This allows precise control over material density without requiring excessively complex equipment, as the parameter variation is achieved through controlled rotational speed differences rather than complex mechanical systems
Solution Approach 2:
The manufacturing process is segmented into multiple calendering stages with different rolls, each contributing specific shear and pressure conditions. This segmentation allows the complex density control requirement to be divided into manageable stages, reducing the complexity of any single piece of equipment while achieving the overall density control goal
2Manufacturing precision
If high shear and pressure are used in existing dry electrode manufacturing processes, then material density is improved, but manufacturing cost increases
Solution Approach 1:
By varying rotational velocities of different calendering rolls, the process achieves precise density control through parameter optimization rather than relying on high-cost, high-pressure equipment. This parameter-based approach reduces manufacturing costs while maintaining density precision
Solution Approach 2:
The patent replaces traditional high-pressure mechanical compression systems with a multi-roll calendering system that uses controlled rotational velocity differences to generate the necessary shear and pressure. This substitution reduces equipment cost and complexity while achieving the same density control outcomes
3Productivity
If large equipment footprint is used in existing manufacturing processes, then production capacity is maintained, but factory space requirements increase
Solution Approach 1:
Multiple calendering functions are merged into a single integrated multi-roll calendering system. This consolidation maintains production capacity by performing multiple processing steps in one machine, thereby reducing the overall factory space required compared to separate equipment for each processing stage
4Manufacturing precision
If complex factory setup is used in existing manufacturing processes, then manufacturing precision is maintained, but ease of operation decreases
Solution Approach 1:
The system maintains film quality control through automated parameter adjustment of rotational velocities, reducing the need for complex manual setup and operation. The controller automatically manages the multiple parameters, simplifying operator tasks while preserving manufacturing precision
5Manufacturing precision
If thin and thick films are produced with precise density control, then electrode quality is improved, but manufacturing complexity increases
Solution Approach 1:
The calendering system uses dynamically adjustable rotational velocities for different rolls, allowing precise control over film thickness and density for both thin and thick films. This dynamic control capability achieves high manufacturing precision without requiring static complex mechanical structures, as the adjustment is achieved through controllable rotational speeds
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 system enables cost-effective, high-precision manufacturing of thin and thick dry electrode films with improved adhesiveness and electrical performance, reducing factory space and operator requirements while minimizing defects like holes and cracks.
Implementation Method 1
a first calendering roll, a second calendering roll... The second calendering roll is configured to form a first nip between the first calendering roll and the second calendering roll. The first nip is configured to receive the dry electrode material from the first dry electrode material delivery system, and form a dry electrode film from the dry electrode material
Implementation Method 2
The controller is configured to control a rotational velocity of the second calendering roll to be greater than a rotational velocity of the first calendering roll
Data Source
AI summary
A system and methods for manufacturing a dry electrode for an energy storage device are disclosed. The system includes a first dry electrode material delivery system configured to deliver a dry electrode material, a first calendering roll, a second calendering roll, and a controller. The second calendering roll is configured to form a first nip between the first calendering roll and the second calendering roll. The first nip is configured to receive the dry electrode material from the first dry electrode material delivery system, and form a dry electrode film from the dry electrode material. The controller is configured to control a rotational velocity of the second calendering roll to be greater than a rotational velocity of the first calendering roll.