Dual-Stage Slurry Filtration for Scratch-Free Electrode Coating
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Solution Overview
Problem
In lithium battery production, slurry deposition and agglomeration lead to large-particle soft substances that penetrate filters under positive pressure, causing scratches and fractures on electrode plates during coating, thereby affecting coating quality.
Innovation Solution
A slurry filtering apparatus comprising a rotating filter element and a gravity filter, where the gravity filter's feed port is higher than its discharge port, allowing slurry to flow by gravity and intercepting large-particle soft substances, reducing impurities and improving coating quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If positive pressure is applied to convey slurry through a filter screen, then filtering efficiency is improved, but large-particle soft substances penetrate the filter screen causing scratches and fractures on electrode plates
Solution Approach 1:
The filtering system is divided into two independent stages: a rotating filter element for initial filtration under positive pressure, and a gravity filter with filter screen for secondary filtration under gravitational flow. This segmentation allows each stage to operate under different pressure conditions, preventing soft substances from penetrating while maintaining filtering efficiency.
Solution Approach 2:
The gravity filter acts as an intermediary between the positive pressure rotating filter and the coating apparatus. It provides a transition zone where slurry flow pressure is reduced from positive pressure to gravitational flow, preventing soft substances from penetrating the second filter screen while still achieving effective filtration.
2Productivity
If slurry is conveyed through pipeline for extended time, then production efficiency is maintained, but slurry deposits and agglomerates forming large-particle soft substances
Solution Approach 1:
The rotating filter element performs preliminary filtration of slurry before it enters the gravity filter. By removing particles and preventing agglomeration in advance, the system maintains continuous conveyance capability while preventing the formation of harmful large-particle soft substances during extended pipeline transport.
Solution Approach 2:
The dual-filter system enables continuous slurry filtration without interruption. The rotating filter element operates continuously under positive pressure, and the gravity filter provides continuous gravitational flow filtration, ensuring uninterrupted slurry conveyance while consistently removing particles that would otherwise agglomerate during transport.
3Manufacturing precision
If filter screen mesh number is increased to reduce impurities, then coating quality is improved, but filtering resistance increases and slurry flow decreases
Solution Approach 1:
The filtering process is segmented into two stages with different mesh requirements. The rotating filter element handles coarse filtration with lower mesh density, maintaining high slurry flow rate. The gravity filter provides fine filtration with higher mesh density, achieving low impurity content. This segmentation allows each stage to optimize between flow rate and filtration precision.
Solution Approach 2:
The system applies partial filtration action at each stage rather than requiring one filter to achieve complete filtration. The rotating filter removes large particles, and the gravity filter removes finer particles. This distributed filtration approach reduces the filtering resistance at each individual stage while achieving overall high filtration 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
Effectively reduces the quantity of large-particle soft substances in the slurry, preventing scratches and fractures on electrode plates, thereby enhancing coating quality and electrical performance of lithium batteries.
Implementation Method 1
the gravity filter's feed port is higher than its discharge port, allowing slurry to flow by gravity
Implementation Method 2
The rotating filter element is configured to provide a positive-pressure filtered slurry to the gravity filter
Data Source
AI summary
Embodiments of this application relate to the field of lithium battery production technologies and disclose a slurry filtering apparatus and a coating system. The slurry filtering apparatus may include a rotating filter element and a gravity filter. The gravity filter may be provided with a feed port and a first discharge port. A height of the feed port on the gravity filter may be greater than that of the first discharge port on the gravity filter. The rotating filter may be connected to the feed port and is configured to provide a positive-pressure filtered slurry to the gravity filter. The first discharge port may be configured to convey a slurry filtered by the gravity filter to a coating apparatus.