Air-Flow Punch Pin for Battery Notching Scrap Ejection
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Solution Overview
Problem
The issue of undischarged scraps entering the battery during the notching process of secondary battery manufacturing, leading to defects such as low voltage, short circuits, and capacity issues, is not adequately addressed by existing technologies.
Innovation Solution
A punch and punching machine design incorporating an air flow path and elastic member to effectively discharge scraps by first blowing them away and then pushing them out using a push pin, preventing entry into the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a punching mold apparatus is used to cut the substrate, then the electrode plate is manufactured according to specifications, but scraps may not be completely discharged and may enter the battery causing defects
Solution Approach 1:
The air blowing unit activates before the punch fully exits to preemptively blow scraps toward the collection area. This preliminary action ensures scraps are directed away from the battery before the punch completes its cycle, preventing potential contamination while maintaining precise cutting operations.
Solution Approach 2:
The air blowing unit serves as an intermediary mechanism between the punching operation and scrap collection. It mediates the scrap discharge process by using air flow to transport scraps from the punch area to the collection area, ensuring reliable scrap removal without compromising the precision of the cutting operation.
2Reliability
If air is blown to discharge scraps, then scraps are pushed toward collection area, but push pin movement requires precise positioning control
Solution Approach 1:
The air blowing unit replaces complex mechanical positioning systems with a pneumatic approach. Instead of relying on precise mechanical movement of the push pin alone, the system uses air flow to accomplish the primary function of scrap discharge, simplifying the control requirements for the push pin positioning while maintaining reliable scrap removal.
Solution Approach 2:
The system employs pneumatic principles by using an air blowing unit to generate air flow that propels scraps toward the collection area. This pneumatic mechanism works in conjunction with the push pin to achieve reliable scrap discharge without requiring complex mechanical positioning control systems.
3Reliability
If the push pin protrudes during punching, then scraps can be pushed out, but the push pin may interfere with the substrate before punching
Solution Approach 1:
The push pin operates with periodic motion, remaining retracted during the approach and punching phases, then extending only during the scrap ejection phase when needed. This periodic action ensures the push pin interferes with scraps only when necessary for ejection, while avoiding interference with the substrate during punching operations.
Solution Approach 2:
The push pin transitions from a static to a dynamic component, moving between retracted and extended positions based on the operational phase. During punching, it remains retracted to avoid substrate interference; during scrap ejection, it extends to push scraps out. This dynamic behavior resolves the contradiction between scrap ejection capability and substrate interference prevention.
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 effective ejection of scraps, reducing battery defects by ensuring scraps are prevented from entering the battery, thereby enhancing manufacturing efficiency and product quality.
Implementation Method 1
a push pin including an air flow path configured to flow through air introduced from the air inlet to the outside
Implementation Method 2
an elastic member between the punch body and the push pin, and configured to provide an elastic restoring force
Data Source
AI summary
A punch includes: a punch body including an inner space and an air inlet; a push pin including an air flow path to flow through air introduced from the air inlet to the outside; and an elastic member between the punch body and the push pin, and to provide an elastic restoring force. The push pin and the elastic member are accommodated in the inner space of the punch body.