Separator Cutter Spring Bush Design to Prevent Foreign Particles
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Solution Overview
Problem
The friction between the spring part and surrounding metal structures in the separator cutting apparatus leads to the generation of foreign substances, causing defects such as short circuits and low voltage in secondary battery production.
Innovation Solution
The spring part of the separator cutting apparatus is redesigned with a non-metallic material, specifically using a spring holder and spring bush made of engineering plastics like polyether ether ketone (PEEK), which minimizes friction and prevents the introduction of foreign substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal spring part is used to return the cutter to the initial position, then the cutter can be returned effectively through elasticity, but friction occurs with surrounding metal structures causing foreign substance generation
Solution Approach 1:
The spring part material is changed from metal to non-metallic material (such as polymer or plastic), fundamentally altering the material parameter to eliminate friction with surrounding metal structures while maintaining the elastic return function of the cutter
Solution Approach 2:
The spring part is constructed using composite or non-metallic materials that combine elastic properties with low friction characteristics, replacing traditional metal springs to prevent foreign substance generation while preserving the cutter return mechanism
2Object-generated harmful factors
If the spring part is made of non-metallic material, then friction with surrounding metals is inhibited, but the structural strength and elasticity may be reduced
Solution Approach 1:
The material parameters of the spring part are optimized by selecting non-metallic materials with appropriate elastic modulus, tensile strength, and fatigue resistance to ensure sufficient mechanical performance while maintaining low friction properties
Solution Approach 2:
The spring part design incorporates localized reinforcement or optimized geometry in critical stress areas to compensate for the inherently lower strength of non-metallic materials compared to metal, ensuring adequate structural integrity
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 design inhibits friction with surrounding metals, preventing the generation of foreign substances and improving product quality by reducing defects like short circuits and low voltage.
Implementation Method 1
a spring part configured to connect elastically the cutter supporting part and the cutter part to each other and return the cutter part to an initial position after cutting the separator
Data Source
AI summary
A separator cutting apparatus includes: a fixing part configured to fix temporarily the electrode assembly; a cutter supporting part disposed above the fixing part; a cutter part disposed below the cutter supporting part, and configured to cut a separator among the electrode assembly temporarily fixed to the fixing part; and a spring part configured to connect elastically the cutter supporting part and the cutter part to each other, and return the cutter part to an initial position after cutting the separator; the spring part includes a spring bush coupled to a supporting shaft provided in the cutter supporting part and the cutter part, respectively, a spring holder integrally coupled to the spring bush, and a spring that expands and contracts according to the elevation of the cutter part by coupling both ends to the spring holder, and the spring holder and the spring bush are made of a non-metallic material.