Electrode Sheet Drying Chamber Rolls for Meandering Control
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Solution Overview
Problem
Conventional drying chamber apparatuses for secondary batteries suffer from electrode sheet meandering due to magnetic alignment, leading to nonuniform drying and defects in the battery.
Innovation Solution
A drying chamber apparatus with meandering-prevention rolls that apply traction force to the uncoated portion of the electrode sheet, combined with crown rolls and pressing rolls to maintain sheet alignment and ensure uniform drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic alignment is performed to improve electrical conductivity and mechanical strength, then the electrode sheet meanders during transport causing nonuniform drying
Solution Approach 1:
The patent introduces guide rolls as intermediary components between the magnetic alignment device and the drying chamber. These guide rolls act as mediators that redirect the magnetic force away from the drying chamber walls, preventing the electrode sheet from being attracted to metallic surfaces while maintaining the beneficial magnetic alignment effects for conductivity and strength.
Solution Approach 2:
The patent extracts the harmful magnetic attraction effect from the drying chamber environment by removing or shielding metallic components that cause sheet deflection. The guide rolls effectively separate the magnetic alignment function from the drying function, allowing magnetic particles to align without causing sheet meandering during the drying process.
2Productivity
If the electrode sheet is transported through the drying chamber, then drying efficiency is achieved, but the sheet meanders toward one side causing defects
Solution Approach 1:
Guide rolls are positioned within the drying chamber to serve as intermediaries that maintain sheet alignment during transport. These rolls intercept and redirect magnetic forces before they can cause the sheet to meander toward the chamber walls, ensuring uniform drying while maintaining productivity.
Solution Approach 2:
The guide rolls are strategically positioned to apply preliminary counteracting forces against magnetic attraction before the sheet can significantly meander. By placing guide rolls at critical locations within the drying chamber, the system preemptively corrects sheet deviation, preventing defects before they occur.
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
Prevents electrode sheet meandering, enabling uniform drying of the active material and improving the manufacturing efficiency of secondary batteries.
Implementation Method 1
a heating unit configured to apply heat to the electrode sheet passing through the drying case to dry the active material
Implementation Method 2
a plurality of meandering-prevention rolls mounted between the transport rolls, the plurality of meandering-prevention rolls being configured to apply friction force to the uncoated portion of the electrode sheet to prevent meandering of the electrode sheet
Data Source
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AI summary
The present invention relates to a drying chamber device for preventing meandering of an electrode sheet for a secondary battery. The device dries an active material by heat, by applying the heat while allowing an electrode sheet to pass therethrough, the electrode sheet including a coated portion which is a region coated with an active material and an uncoated portion on which the active material is not coated. The device comprises: a drying case having an inlet part and an outlet part and allowing an electrode sheet to pass therethrough and providing a drying space; a plurality of transfer rolls arranged inside the drying case and transferring an electrode sheet having entered through the inlet part, to send the electrode sheet to the outlet part; a heating portion which dries the active material by applying heat to the electrode sheet passing through the drying case; and a plurality of meandering prevention rolls that are installed between the transfer rolls and prevent meandering of the electrode sheet by applying a pulling force to the uncoated portion of the electrode sheet. The drying chamber device for preventing meandering of an electrode sheet for a secondary battery according to the present invention configured as above prevents meandering of an electrode sheet passing through a drying case, thereby enabling uniform drying of an active material.