Electrode Assembly Tape Attachment for Short-Safe Battery Insulation
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Solution Overview
Problem
Secondary batteries face a risk of electrical shorts due to uninsulated portions on the insulating plate, which can cause the positive electrode to contact the case functioning as the negative electrode.
Innovation Solution
A tape attaching device with compression jigs and a pressing device is used to securely attach an insulating tape around the electrode assembly, ensuring complete coverage and preventing electrical shorts by insulating the positive and negative electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating plate is used to electrically insulate the positive and negative electrodes, then electrical insulation is improved, but uninsulated portions on the outer portion of the insulating plate may cause electrical shorts
Solution Approach 1:
An insulating tape is wrapped around the outer peripheral surface of the electrode assembly to form a continuous insulating film. This flexible thin film solution covers the entire outer surface including corners and edges, eliminating uninsulated portions that could cause electrical shorts while maintaining the electrical insulation function of the insulating plate.
Solution Approach 2:
The insulating structure is divided into two segments: an insulating plate at the bottom and an insulating tape wrapped around the outer peripheral surface. This segmentation allows each component to perform its specific function - the plate provides base insulation while the tape ensures complete coverage of the outer surface, together eliminating all electrical short risks.
2Reliability
If compression jigs are used to bend and attach the insulating tape, then tape attachment reliability is improved, but device complexity increases
Solution Approach 1:
The compression jig is divided into multiple independent compression units, each capable of applying force to specific sections of the insulating tape. This segmentation allows for localized compression and attachment while keeping each individual compression unit simple in structure, reducing overall device complexity while maintaining high attachment reliability.
Solution Approach 2:
The compression jig employs movable compression units that can dynamically adjust their position and apply compression force as needed during the tape attachment process. This dynamic capability enables reliable tape attachment without requiring a permanently complex mechanical structure, as compression is applied only where and when needed.
Data Source
AI summary
A tape attaching device including: a lower support structure to support a cylindrical electrode assembly; a plurality of compression jigs to bend an insulating tape attached to a side surface of the electrode assembly and protruding in a height direction along a circumference of an upper surface of the electrode assembly, and attach the insulating tape to the upper surface of the electrode assembly; a pressing device to flatten the upper surface of the electrode assembly to which the insulating tape is attached; and a controller to control the compression jigs and the pressing device.