Slurry Bubble Venting in Battery Coating Filters
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Solution Overview
Problem
Existing methods for removing air bubbles in secondary battery slurry are economically burdensome and complex, requiring separate equipment and time-consuming processes, leading to electrode defects and potential fires due to air bubble inclusion in the coating process.
Innovation Solution
An apparatus that collects air bubbles at the upper portion of a filter using a collection apparatus without a power source, discharging them via air bubble discharge holes and a vent hole that opens and closes based on specific gravity, and includes an emergency valve to manage sudden pressure increases, utilizing the slurry's flow force to remove bubbles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional air bubble removal methods are used, then air bubbles can be removed from slurry, but additional equipment and power sources are required, increasing device complexity and operational costs
Solution Approach 1:
The apparatus utilizes the slurry's own flow force to discharge air bubbles without requiring external power sources or additional active components. The air bubble discharge holes and vent hole passively utilize the kinetic energy of the flowing slurry to remove air bubbles, making the system self-service and eliminating the need for separate power supply equipment.
Solution Approach 2:
The invention extracts only the essential function of air bubble removal from complex deaeration systems. By using simple structural elements (discharge holes, vent hole, and stopper) rather than complete deaeration equipment, it separates the air removal function from power supply and control systems, reducing overall device complexity.
2Reliability
If complex air bubble removal equipment is installed, then air bubble removal capability is improved, but operational costs and labor requirements increase
Solution Approach 1:
The system operates passively using the natural flow of slurry through the coating apparatus. No manual intervention, power consumption, or operational monitoring is required beyond the normal slurry supply process, significantly reducing operational costs and labor requirements compared to active deaeration systems.
3Device complexity
If air bubbles are not removed from slurry, then the coating process can proceed without additional equipment, but electrode defects and safety issues occur
Solution Approach 1:
The invention extracts only the critical air bubble removal function from complex deaeration systems by implementing simple discharge holes and a vent hole. This minimal structural addition effectively prevents electrode defects and pinholes without requiring comprehensive deaeration equipment, thus eliminating harmful factors with minimal complexity increase.
4Device complexity
If pressure buildup is allowed in the filter, then the apparatus structure remains simple, but sudden pressure increases can cause safety issues
Solution Approach 1:
The vent hole with stopper mechanism serves as a pre-designed safety release path that prevents dangerous pressure buildup before it can occur. The stopper allows the vent hole to remain closed during normal operation (maintaining filtration pressure) but automatically opens when pressure exceeds the stopper's weight, providing beforehand cushioning against pressure safety issues.
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
This apparatus efficiently removes air bubbles without additional components, ensuring stable slurry supply, reducing labor and operational costs, and preventing electrode defects and fires by discharging air bubbles using the slurry's inherent flow force.
Implementation Method 1
collected at an upper portion of a filter due to retention in a collection apparatus
Implementation Method 2
a vent hole that opens and closes based on specific gravity, and discharges the air bubbles
Implementation Method 3
an emergency valve to manage sudden pressure increases
Data Source
Figure 1~2
Figure 3
Figure 3a~3b
AI summary
The present disclosure relates to an apparatus for preventing the inflow of foreign substances such as air bubbles, fine particles, and air pockets, of various sizes, when coating a secondary battery coating slurry, and more particularly, to an apparatus for removing foreign substances, such as air bubbles in a supplied slurry, by discharging the foreign substances including progressive air bubbles in various forms and with various apparatuses from a location where the air bubbles are collected when supplying a secondary battery coating slurry.