Secondary Battery Taping Surface Grooves for Reliable Tape Attachment
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Solution Overview
Problem
During the production of secondary batteries, a phenomenon occurs where the sticky portion of the finishing tape is transferred to the taping device, causing the tape to remain in the attachment unit rather than being attached to the electrode assembly, resulting in a defect where the finishing tape is not properly attached.
Innovation Solution
A taping device is designed with a taping unit that includes an adhesive member movement surface with a pair of long sides and short sides, a pressing surface to ensure close contact with the electrode assembly, and at least one groove along the long side edges of the pressing surface to prevent adhesive transfer. The taping unit also includes a cutting unit to cut the adhesive member to the appropriate length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a finishing tape is attached to the electrode assembly using a taping device, then the electrode assembly is properly finished and protected, but the sticky portion of the tape may transfer to the taping device causing the tape to remain in the attachment unit rather than being attached to the electrode assembly
Solution Approach 1:
The adhesive member placement region is divided into multiple segments by introducing grooves that partition the surface. This segmentation prevents the continuous adhesive from spreading across the entire placement region and transferring to the taping device, thereby resolving the adhesive transfer problem while maintaining reliable tape attachment.
Solution Approach 2:
The grooves create regions with different local qualities on the adhesive member placement surface. The grooved areas have reduced adhesive presence compared to the raised areas, creating a non-uniform adhesive distribution that prevents complete adhesive transfer to the taping device while ensuring sufficient adhesive contact with the electrode assembly for reliable attachment.
2Object-generated harmful factors
If the adhesive member placement region is modified to prevent adhesive transfer, then adhesive transfer is reduced, but the structure of the taping device becomes more complex
Solution Approach 1:
The placement region is segmented into multiple zones using grooves, creating a structured surface that controls adhesive flow. This segmentation approach effectively reduces adhesive transfer to the taping device while adding minimal structural complexity, as the grooves are simple geometric features integrated into the existing placement region.
Solution Approach 2:
By creating localized variations in the placement region surface through grooves, the invention achieves adhesive transfer prevention through local structural modifications rather than comprehensive redesign. This local quality change approach minimizes overall device complexity while effectively addressing the adhesive transfer issue.
Data Source
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AI summary
A taping device for a secondary battery includes: a taping unit (110) configured to attach an adhesive member (20) at an adhesive member attachment position of an outer surface of an electrode assembly; a driving unit (120) configured to locate the taping unit (110) at the adhesive member attachment position of the electrode assembly and to move the taping unit (110) in an outward direction of the electrode assembly; and a supply unit (130) configured to supply the adhesive member to the taping unit. The taping unit includes an adhesive member movement surface (111) on which the adhesive member is placed, a pressing surface (1111) configured to press the adhesive member to be in close contact with the adhesive member attachment position of the electrode assembly and at least one groove (111a) at at least one of a pair of long side edges of the pressing surface (1111) of the adhesive member movement surface.