Asymmetric Punch Cutting for Inclined Electrode Scrap Ejection
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Solution Overview
Problem
The existing punching devices used in the notching process for secondary battery electrode plates risk damaging the plates and allowing scrap material to enter the battery, leading to issues such as low voltage, short circuits, and reduced capacity due to improper discharge of scrap.
Innovation Solution
A punching device with a punch featuring asymmetrical cut portions that apply an asymmetrical shear force, cutting the scrap at an angle to discharge it in an inclined state, reducing its width and preventing it from getting stuck in the device or entering the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a push pin is used to push and discharge scrap, then scrap discharge is improved, but the electrode plate may be damaged by premature contact with the push pin
Solution Approach 1:
The punch is designed with asymmetrical cut portions (first and second cut portions with different shapes) that create an inclined cutting action. This asymmetry causes the scrap to be discharged at an angle, preventing it from getting caught in the punching device while avoiding the need for a push pin that would contact and potentially damage the electrode plate
2Reliability
If scrap is not properly discharged, then battery stability deteriorates, but modifying the punch structure to improve discharge increases device complexity
Solution Approach 1:
The punch incorporates asymmetrical cut portions that are relatively simple in structure but effectively change the scrap discharge trajectory. This asymmetrical design allows scrap to discharge at an inclined angle, preventing accumulation and entry into the battery without requiring complex additional mechanisms or structures
Solution Approach 2:
The invention changes the discharge dimension by creating an inclined discharge path rather than vertical discharge. The asymmetrical cut portions cause the scrap to discharge at an angle relative to the punch movement axis, utilizing a different spatial dimension to solve the scrap accumulation problem
3Productivity
If scrap accumulates in the punching device, then productivity decreases, but increasing discharge velocity may cause the push pin to contact the electrode plate earlier
Solution Approach 1:
The asymmetrical cut portions enable rapid scrap discharge at an inclined angle, preventing accumulation that would slow down production. The design allows high punching speeds to be maintained because the scrap is efficiently discharged without requiring a push pin that would contact the electrode plate and cause damage
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 effectively discharges scrap material smoothly, preventing accumulation in the device and entry into the battery, thereby enhancing battery stability and performance.
Implementation Method 1
Due to the different shapes of the first and second cut portions, e.g. a left-right asymmetrical structure, an asymmetrical force (i.e. a shear force) is applied to the substrate prior to cutting of the scrap.
Data Source
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AI summary
A punching device (300) comprising: a die (310) configured to receive a substrate (340) corresponding to a cutting target disposed thereon; a stripper (320) spaced from and facing the die (310), and configured to move toward the substrate (340) to pressurize and fix the substrate (340) on the die (310); and a punch (330) configured to move toward the substrate (340) to cut the substrate (340) to form a scrap, wherein the punch (330) comprises a first cut portion (410) and a second cut portion (420) having different shapes from each other with respect to a movement axis (350) of the punch (330).