Ultrasonic Slurry Filtration for Anti-Clog Separator Coating
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Solution Overview
Problem
Existing slurry filtering technologies for secondary battery separators are prone to occlusion due to binder polymers, leading to short filter replacement cycles, increased costs, and reduced electrical capacity and energy density of secondary batteries.
Innovation Solution
A slurry filtering apparatus incorporating an ultrasonic module within the filter to prevent occlusion by generating ultrasonic vibrations, combined with a modular accommodation structure for easy filter management and replacement, and a porous structure with progressively smaller pores to enhance filtering efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is used to remove large particles or foreign substances from slurry, then the separator durability and insulation are improved, but the filter is easily occluded by binder polymer, leading to short replacement cycle and increased cost
Solution Approach 1:
An ultrasonic module is disposed inside the filter to generate ultrasonic vibration that prevents occlusion of the filter by binder polymer. The vibration keeps the filter pores clear, extending the filter's operational life while maintaining its particle removal capability
Solution Approach 2:
The ultrasonic module acts as an intermediary element introduced into the filter system. It mediates between the binder polymer that causes occlusion and the filter structure, using ultrasonic waves to prevent the harmful interaction between binder polymer and filter pores
2Reliability
If the thickness of the separator is increased to prevent physical damage and insulation loss, then the separator reliability is improved, but the electrical capacity and energy density of the secondary battery are lowered
Solution Approach 1:
The filter is designed as a replaceable component with extended service life due to the ultrasonic anti-occlusion feature. This allows the use of thinner separators since the filter can be maintained or replaced without compromising the thin separator's performance, effectively decoupling separator thickness from reliability
3Reliability
If the filter replacement cycle is shortened to ensure separator quality, then the separator reliability is improved, but the coating process time and manufacturing cost are increased
Solution Approach 1:
The ultrasonic module continuously vibrates the filter to prevent binder polymer occlusion, thereby extending the filter replacement cycle. This maintains high separator quality while reducing filter replacement frequency, improving overall manufacturing productivity
Solution Approach 2:
The ultrasonic vibration operates continuously during filter usage to maintain filter permeability. This continuous action ensures the filter remains effective throughout its extended service life, maintaining separator quality without interruption to the coating process
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 significantly extends filter usage time and filtering capacity per unit time, reduces manufacturing costs, ensures separator durability and insulation, and enables thinner separators, thereby improving the electrical capacity and energy density of secondary batteries.
Implementation Method 1
an ultrasonic module having at least a portion that is disposed in an internal space of the filter and configured to generate ultrasonic vibration inside the filter
Data Source
AI summary
Disclosed are a slurry filtering apparatus and a separator manufacturing system including the same. A slurry filtering apparatus according to one aspect of the present disclosure may include: an accommodation structure having an accommodation space therein, and a first inlet and a first outlet leading to the accommodation space; a filter accommodated in the accommodation space and configured to filter slurry flowing in through the first inlet and discharge the filtered slurry to the first outlet; and an ultrasonic module having at least a portion that is disposed in an internal space of the filter and configured to generate ultrasonic vibration inside the filter.