Roughened Insulating Sheet for Secondary Battery Feeding
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Solution Overview
Problem
The shaping process of insulating sheets for secondary battery electrode assemblies is hindered by static electricity-induced adhesion, leading to multiple feed issues and reduced productivity.
Innovation Solution
Roughening at least one surface of the insulating sheet to a minimum arithmetic mean roughness (Sa) of 0.3 μm, using methods such as rollers with surface depressions or chemical treatments, prevents adhesion and facilitates smooth feeding into shaping jigs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If insulating sheets are stacked flat for storage and processing, then space utilization is improved, but static electricity causes the sheets to adhere to each other leading to multiple feed issues
Solution Approach 1:
The invention changes the surface parameter of the insulating sheet by forming protrusions with a predetermined height. This physical modification alters the surface topology to prevent static electricity-induced adhesion between stacked sheets, thereby eliminating multiple feed issues while maintaining space-efficient stacking.
Solution Approach 2:
The invention introduces curved protrusions on the insulating sheet surface rather than flat surfaces. These curved structures create air gaps and reduce contact area between stacked sheets, preventing static adhesion and ensuring accurate single-sheet feeding while maintaining compact stacking.
2Reliability
If a shaping process is used to form box-like or bag-like insulating sheets, then the insulating function is improved, but the process complexity increases and static electricity adhesion occurs
Solution Approach 1:
The invention performs preliminary action by forming protrusions on the insulating sheet during the sheet production stage, before the shaping process. This pre-treatment prevents static adhesion in advance, simplifying subsequent shaping operations and eliminating the need for complex anti-adhesion measures during shaping.
Solution Approach 2:
The invention applies local quality by creating protrusions only on specific surfaces of the insulating sheet where adhesion problems occur. This localized modification maintains the overall simplicity of the shaping process while effectively preventing static electricity-induced adhesion at critical contact points.
3Ease of manufacture
If the insulating sheet surface is kept smooth, then manufacturing is simpler, but static electricity causes adhesion between stacked sheets
Solution Approach 1:
The invention modifies the surface parameter by forming protrusions with controlled height and distribution. This change maintains manufacturing simplicity through straightforward processes like embossing or molding while effectively disrupting static electricity accumulation and preventing adhesion between stacked sheets.
Solution Approach 2:
The invention converts the harmful effect of static electricity into a beneficial outcome. By forming protrusions, the sheet surface creates controlled friction and air gaps that actually reduce static buildup and adhesion, transforming what was a manufacturing complication into a solution that enhances feeding reliability.
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 insulating sheet adhesion during stacking and feeding, enhancing productivity by reducing multiple feeds and improving the efficiency of the secondary battery manufacturing process.
Implementation Method 1
In the stack of insulating sheets, static electricity tends to be generated, and static electricity tends to cause the insulating sheets to adhere to each other.
Implementation Method 2
The arithmetic mean roughness (Sa) of at least one surface of the insulating sheet is 0.3 μm or more... at least one surface of the insulating sheet is roughened. Thus, when insulating sheets are stacked, the insulating sheets can be prevented from adhering to each other
Data Source
AI summary
A rolled electrode assembly having a positive electrode plate and a negative electrode plate is housed in a prismatic outer body having as mouth together with non-aqueous electrolyte, and the mouth of the prismatic outer body is sealed by a sealing plate made of metal. The rolled electrode assembly is housed in the prismatic outer body, with the outer surface of the rolled electrode assembly covered by an insulating sheet except for the outer surface facing the sealing plate. The arithmetic mean roughness (Sa) of at least one surface of the insulating sheet disposed between the rolled electrode assembly and the prismatic outer body is 0.3 μm or more.