Battery Tab Insulation Tape Edges That Stop Peeling Spread
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Solution Overview
Problem
It is challenging to prevent the peeling of insulating tape from spreading over the entire surface of a secondary battery, particularly at the joint portions between electrode leads and terminals, which can lead to electrical connectivity issues and reduced battery performance.
Innovation Solution
The implementation of insulating tapes with irregular edge portions at both ends, specifically a first edge portion and a second edge portion, which are designed to prevent peeling by creating a cut when initiated, ensuring that only a portion of the tape is peeled off and maintaining coverage over the welded portions, thereby preventing the entire tape from detaching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating tape is attached to a joint portion between an electrode lead and an electrode tab, then electrical insulation is improved, but the tape is prone to peeling off completely
Solution Approach 1:
The tape is divided into multiple sections by forming cut portions (through-holes) at regular intervals along its length. This segmentation prevents complete peeling by creating fixed anchor points, while each segment between cuts maintains electrical insulation functionality. The cut portions act as barriers that stop peeling propagation, thus resolving the contradiction between maintaining insulation reliability and preventing tape detachment.
2Area of stationary object
If the tape is made longer to cover more surface area, then insulation coverage is improved, but the tendency to peel off increases
Solution Approach 1:
By introducing periodic cut portions along the tape length, the long continuous tape is segmented into multiple shorter effective sections. Each section maintains adequate coverage area for insulation, while the cuts prevent the cumulative peeling effect that would occur in a long continuous tape. This allows the tape to provide extensive coverage without the instability associated with long uninterrupted adhesive surfaces.
Solution Approach 2:
The cut portions are pre-formed during tape manufacturing before application to the battery. These preliminary structural modifications create predetermined peeling stop points that will function automatically if peeling is initiated, preventing the need for longer continuous tape while maintaining adhesion stability across the required coverage area.
Data Source
AI summary
A secondary battery is provided and includes an electrode assembly in which a plurality of positive electrodes and negative electrodes are laminated with a separator interposed between them, a plurality of current collecting tabs extending from each current collector of a plurality of the positive electrodes and negative electrodes, a conductive terminal joined to a plurality of the current collecting tabs, and a laminate film including the electrode assembly. A plurality of the positive electrodes and negative electrodes have a current collector and an active material layer formed on a surface of the current collector. The secondary battery further includes an insulating tape covering a joint portion between a plurality of the current collecting tabs and the terminal. The laminate film has a sealing portion, and the tape has a first edge portion at one end on a tip side of the terminal and a second edge portion at another end, and each of the first edge portion and the second edge portion has a plurality of irregularities.