Dry Powder Screw Kneading for Fiberized Electrode Mixing
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Solution Overview
Problem
Existing dry powder kneading apparatuses face challenges in efficiently kneading mixtures into fiberized dry powder without damaging the screw, particularly when manufacturing dry electrodes for rechargeable batteries, due to high cohesiveness and low flowability of the dry powder, leading to screw damage or stoppage.
Innovation Solution
A dry powder kneading apparatus with a screw configuration of 6.1 kgf·m to 34 kgf·m rotation torque and an inner space temperature of 126° C. to 146° C., featuring a conveying, kneading, and neutral element, along with a feeder and motor, to effectively knead the mixture into fiberized dry powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high rotation torque is applied to knead the mixture, then kneading effectiveness is improved, but screw damage risk increases
Solution Approach 1:
The patent optimizes the rotation torque parameter to a specific range (1 to 30 times 1.4 kgf·m) to achieve effective kneading while preventing screw damage. This parameter optimization resolves the contradiction by finding the optimal operating window that balances kneading effectiveness with screw reliability.
2Productivity
If temperature is increased to improve flowability, then mixing efficiency is improved, but energy consumption increases
Solution Approach 1:
The patent maintains the inner space temperature at 110°C or higher to improve the flowability and mixing efficiency of the dry powder mixture. This temperature parameter optimization enhances productivity while managing energy consumption through controlled heating.
3Productivity
If screw rotation speed is increased to improve productivity, then output is improved, but kneading quality deteriorates
Solution Approach 1:
The patent optimizes the screw shaft speed to a specific range (60-90 RPM) that balances productivity with kneading quality. This parameter optimization ensures adequate mixing time while maintaining high output, resolving the contradiction between production speed and product quality.
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 suppresses screw damage and enables easy kneading, producing a dry electrode with improved tensile strength, suitable for manufacturing free-standing films.
Implementation Method 1
a screw that is disposed in the inner space of the main body, moves the mixture in one direction, and kneads it into fiberized dry powder
Implementation Method 2
a kneading element connected to the conveying element to knead the mixture into the fiberized dry powder
Implementation Method 3
A temperature of the inner space of the main body may be 126° C. to 146° C.
Implementation Method 4
a motor connected to the screw to rotate the screw
Data Source
AI summary
A dry powder kneading apparatus includes a main body including an inner space into which a mixture containing an active material, a conductive material, and a binder is supplied, and a screw inside the inner space of the main body, the screw being configured to move the mixture in one direction and to knead the mixture into fiberized dry powder, and a rotation torque of the screw being 1.4 kgf·m to 42 kgf·m.