Rolling Winding Needle Assembly for Separator-Safe Battery Winding
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Solution Overview
Problem
The production efficiency of batteries is hindered by significant friction between winding needles and separators during the winding process, leading to scratching and misplacement of the separator, resulting in waste and reduced efficiency.
Innovation Solution
A winding needle assembly comprising a first and second winding needle with a rolling member on the second needle, which reduces friction through rolling contact, preventing scratching and misplacement of the separator during insertion and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If winding needles are used to clamp and move the separator during winding, then the separator can be held and wound efficiently, but significant friction occurs between the needles and separator causing scratching and misplacement
Solution Approach 1:
A coating layer is applied on the surface of the winding needles, serving as an intermediary between the needle and separator. This coating layer reduces direct contact friction and prevents the needle from scratching or misplacing the separator, while still maintaining sufficient clamping force for efficient winding operations.
Solution Approach 2:
The surface properties of the winding needles are modified by changing parameters such as surface roughness, material composition, or coating characteristics. These parameter changes reduce the coefficient of friction between the needle and separator, preventing damage while maintaining winding efficiency.
2Reliability
If the friction between winding needles and separator is reduced to prevent damage, then separator quality is maintained, but the clamping force and winding control may be compromised
Solution Approach 1:
The coating on the winding needles is designed with specific physical and chemical parameters that allow it to provide low friction for protection while maintaining adequate adhesion and clamping force. The coating thickness, material hardness, and surface energy are optimized to balance these competing requirements.
Solution Approach 2:
The winding needle surface comprises a composite structure with a base material providing structural strength and a surface coating providing low-friction protective properties. This composite approach allows the needle to maintain clamping force while preventing separator damage through reduced friction contact.
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 enhances production efficiency and quality by minimizing friction and preventing separator damage, thereby reducing material waste and improving battery production processes.
Implementation Method 1
there is rolling friction between the rolling member and the first winding needle, reducing the friction between the first winding needle and the second winding needle
Data Source
AI summary
Embodiments of the present application provide a needle winding assembly for winding electrode plates and a separator and a winding device. The winding needle assembly includes a first winding needle and a second winding needle for clamping the separator, and the second winding needle is provided with a rolling member on a side of the second winding needle toward the first winding needle. Due to the presence of the rolling member, there is rolling friction between the rolling member and the first winding needle, reducing the friction between the first winding needle and the second winding needle, which avoids scratching the separator when the winding needle assembly is inserted into the separator or pulled out of the separator, or avoids misplacing and bringing out part of the separator when the second winding needle is pulled out, which otherwise would reduce the production efficiency of the battery.