Patterned Powder Feeding for Uniform Dry Electrode Supply
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Solution Overview
Problem
Existing technologies face challenges in efficiently feeding fibrous dry powders, including active materials, conductive materials, and binders, to manufacturing apparatuses for dry electrodes in rechargeable batteries, due to low dispersibility and high cohesiveness of the powders, leading to supply deviations and non-uniformity in the dry electrode production.
Innovation Solution
A dry powder feeding apparatus is designed with a feeder that discharges fibrous dry powders and a trough with bottom pattern portions that protrude at obtuse angles, along with a chute containing internal pattern portions, to enhance the dispersibility and uniform distribution of the dry powders along the trough, thereby minimizing supply deviations and ensuring uniformity in the dry electrode manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fibrous dry powder is discharged directly without dispersion structure, then the discharge process is simple, but the dispersibility is low and supply deviation occurs
Solution Approach 1:
The trough bottom is segmented into multiple bottom pattern portions (protrusions) that divide the continuous powder flow into smaller segments, enhancing dispersion. Similarly, the chute is divided into multiple internal pattern portions that segment the powder during transit, preventing clumping and improving uniformity of supply to the calendering roll.
Solution Approach 2:
The bottom pattern portions are strategically positioned at specific locations in the trough to create localized dispersion zones where powder is redistributed. The internal pattern portions in the chute are placed at critical points to enhance local mixing and prevent channeling, ensuring uniform powder distribution without requiring complete redesign of the entire system.
2Productivity
If dry powder is fed without dispersion enhancement, then the device complexity is low, but supply deviation and non-uniformity occur
Solution Approach 1:
The dispersion structures (bottom pattern portions and internal pattern portions) perform preliminary action by pre-distributing and pre-mixing the dry powder before it reaches the calendering roll. This preliminary dispersion prevents clumping and ensures uniform feed, thereby improving manufacturing efficiency without requiring complex post-processing or rework.
3Manufacturing precision
If simple discharge structure is used, then ease of manufacture is high, but dispersibility of fibrous powder is insufficient
Solution Approach 1:
The bottom pattern portions and internal pattern portions modify the physical parameters of the powder flow by changing its velocity distribution, flow pattern, and contact time with the discharge surfaces. These parameter changes enhance dispersibility through controlled turbulence and redistribution, achieving better uniformity without requiring fundamentally different manufacturing processes.
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 apparatus effectively disperses the fibrous dry powders across the trough, reducing supply deviations and enhancing the uniformity of the dry electrode production, thereby improving the manufacturing efficiency and quality of large-area dry electrodes.
Implementation Method 1
a trough that is adjacent to the feeder and includes a bottom surface moving the dry powder discharged from the feeder in a first direction
Implementation Method 2
The trough may further include a vibrator that vibrates the bottom surface or bottom
Data Source
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AI summary
A dry powder feeding apparatus includes a feeder accommodating a fibrous dry powder, the fibrous dry powder including an active material, a conductive material, and a binder, and a trough adjacent to the feeder, the trough including a bottom and a plurality of bottom pattern portions protruding from an inner surface of the bottom, the bottom of the trough being configured to move the fibrous dry powder discharged from the feeder in a first direction.