Battery Electrode Winding Guide for Tab Swing Suppression
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Solution Overview
Problem
Existing winding apparatuses for secondary batteries, such as lithium-ion batteries, cause significant damage to electrode sheet tabs due to swing motion and collisions with transfer rollers during acceleration and deceleration, leading to poor quality and potential breakage.
Innovation Solution
A winding apparatus with a swing motion suppressing guide positioned upstream of the transfer roller, which gradually suppresses the swing motion of tabs by changing contact points from the base to the leading end, reducing kinetic energy and load on the tabs, and incorporating a roller outer circumferential guide to prevent tab rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deformation preventive member is disposed at a position of the transfer roller corresponding to an inlet of the electrode sheet, then the tabs are prevented from being bent or broken, but the tabs still collide with the outer circumferential face of the transfer roller causing significant damage
Solution Approach 1:
The patent introduces a swing motion suppressing guide as an intermediary component between the electrode sheet inlet and the transfer roller. This guide suppresses the swing motion of tabs before they reach the transfer roller, preventing collision damage while allowing the transfer roller to continue its primary function of transferring the electrode sheet.
Solution Approach 2:
The swing motion suppressing guide is positioned upstream of the transfer roller to preliminarily suppress tab swing motion before the tabs encounter the transfer roller. This preliminary action prevents the harmful collision from occurring in the first place, rather than attempting to mitigate damage after collision.
2Productivity
If the electrode sheet is transferred at accelerating or decelerating speed to the winding core, then the winding process is efficient, but vibration and resonance cause tabs to have swing motion leading to collision damage
Solution Approach 1:
The swing motion suppressing guide serves as a mediator that decouples the relationship between high-speed transfer and tab stability. It allows the electrode sheet to be transferred at varying speeds for productivity while independently suppressing tab swing motion that would otherwise be caused by acceleration and deceleration.
Solution Approach 2:
The guide is positioned to preliminarily suppress swing motion before tabs enter the transfer roller zone, addressing the harmful effect of acceleration/deceleration-induced vibration before it can cause damage.
3Reliability
If the swing motion suppressing guide contacts the tabs to suppress swing motion, then tab collision is prevented, but the contact location should gradually change from base to leading end to reduce load on tabs
Solution Approach 1:
The swing motion suppressing guide is designed with a specific geometry that causes the contact location to dynamically change from the tab base to the leading end as the tab moves through the guide. This dynamic contact pattern gradually suppresses swing motion while distributing and reducing the load on the tabs compared to fixed-point contact.
Solution Approach 2:
The guide's geometric parameters are designed to create a progressive contact sequence, changing the contact point position along the tab length. This parameter variation in the contact location allows for effective swing suppression while minimizing peak loads on the tab structure.
Data Source
AI summary
A winding apparatus winds up a belt-shaped electrode sheet including an active material and a belt-shaped separator sheet made of an insulating material, and includes: a rotatable winding core to which the electrode and sheets are fed at accelerating or decelerating speed, and around which the electrode sheet and the separator sheet are wound; a rotatable transfer roller that defines a transfer path of the electrode sheet and has an outer circumference face on which the electrode sheet is placed; and a swing motion suppressing guide disposed at a position immediately upstream of the transfer roller along the transfer path. The electrode sheet includes: an electrode main body on which the active material is applied; and tabs protruded from a width direction edge portion of the electrode main body and disposed at intervals along a longitudinal direction of the electrode main body.