Tapered Powder Hopper With Feedback Control for Dry Electrode Feeding
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Solution Overview
Problem
Existing powder hoppers for feeding powdered electrode precursor material into a nip in dry electrode calendering processes suffer from inaccurate material feeding, resulting in inhomogeneous electrode tracks with variations in thickness and width.
Innovation Solution
A gravity-driven powder hopper with a tapered cross-section, equipped with level and weight detection devices connected to a control unit, allowing for continuous monitoring and regulation of powder fill levels and density, ensuring homogeneous material distribution and preventing system damage from over/underfilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual feeding or conventional powder hoppers are used, then the operation is simple, but the feed accuracy is poor resulting in inhomogeneous electrode tracks
Solution Approach 1:
The patent implements feedback control by continuously monitoring the powder fill level in the hopper using sensors and adjusting the feed rate accordingly. This closed-loop system ensures accurate metering of powder into the nip while maintaining homogeneous electrode track formation, resolving the contradiction between feed accuracy and system complexity.
Solution Approach 2:
The patent replaces manual feeding operations with an automated controlled feeding system that uses sensors, control units, and automated adjustment mechanisms. This substitution improves feed accuracy and homogeneity while the control system manages the complexity, allowing precise metering without manual intervention.
2Quantity of substance
If high processing pressures are applied to compact powder, then the electrode film density increases, but the space requirement and system dimensions increase
Solution Approach 1:
The patent applies preliminary compaction by allowing powder to accumulate and self-compact in the hopper under gravity before feeding into the nip. The controlled feeding process maintains optimal powder density without requiring additional high-pressure compacting equipment, thus achieving high powder density while minimizing system space 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 solution ensures a homogeneous electrode track thickness and width, enabling timely detection and prevention of operational errors, and maintains constant powder density by adjusting the feed rate and conveyor position, optimizing the compaction and distribution of the powdered material.
Implementation Method 1
powder hopper for gravity-driven feeding of powdered electrode precursor material into a nip
Data Source
AI summary
The invention relates to a powder hopper (101) for the gravity-driven feeding of powdered electrode precursor material (102) into a nip of a dry electrode calendar (2), said powder hopper comprising: a powder feed opening (105) for feeding powdered electrode precursor material (102) into the powder hopper; and a powder outlet opening (106) for metering the powdered electrode precursor material from the powder hopper into a nip, the cross-section of the powder hopper tapering between the powder feed opening and the powder outlet opening, and the powder hopper having a level detection means (103) for detecting the powder level of the powder hopper. The invention also relates to: a corresponding assembly consisting of a powder hopper and a first and a second roller that form a nip; and a method for operating a powder hopper.