Cylindrical Battery Winding Tape for Groove Insulation Stability
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Solution Overview
Problem
Cylindrical batteries face the risk of short circuits due to misalignment of the electrode assembly and insulating plate, which can occur from vibration, impact, or expansion during charging and discharging, leading to contact between the electrode assembly and the grooved portion of the outer can.
Innovation Solution
A winding fixation tape with a protruding portion is attached to the outer peripheral surface of the electrode assembly, which is bent radially inward and interposed between the grooved portion and the electrode assembly, forming a single unit to prevent contact and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating plate is provided to prevent contact between the grooved portion and the positive electrode, then short circuit prevention is improved, but misalignment due to vibration or expansion can cause the insulating plate to become ineffective
Solution Approach 1:
The insulating function is merged with the winding fixation tape that is already attached to the electrode assembly. By forming the protruding portion from the same tape used for fixation, the invention combines the insulating plate's protective function with the existing structural component, ensuring they move together as a single unit and eliminating misalignment issues.
Solution Approach 2:
The protruding portion of the winding fixation tape acts as an intermediary insulating element between the grooved portion and the electrode assembly. This intermediary structure provides reliable insulation by being directly attached to the electrode assembly, ensuring consistent positioning even during vibration or expansion.
2Shape
If the electrode assembly and insulating plate have smaller diameter than the outer can, then proper fitting is achieved, but misalignment occurs during vibration or expansion leading to contact with the grooved portion
Solution Approach 1:
The winding fixation tape with protruding portion is attached to the electrode assembly in advance, creating a pre-positioned insulating barrier. This preliminary action ensures that the insulating structure is already in place and moves with the electrode assembly, preventing future misalignment and contact with the grooved portion.
3Reliability
If a separate insulating plate is used, then insulation is provided, but additional components increase device complexity
Solution Approach 1:
The invention merges the insulating plate function with the winding fixation tape, eliminating the need for a separate insulating plate component. The protruding portion of the tape serves dual purposes: fixing the winding structure and providing insulation, thereby reducing device complexity while maintaining reliability.
Data Source
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AI summary
A cylindrical battery (10), which is one example of an embodiment, is provided with: an electrode body (14) having a wound structure; a bottomed cylindrical outer can (16) that accommodates the electrode body (14); and a sealing body that closes an opening portion of the outer can (16). A tape (50) for fixing a winding end of the wound structure is bonded to an outer peripheral surface of the electrode body (14). The tape (50) has an extension portion (53) extending from an end, on a grooved portion (22) side, of the outer peripheral surface of the electrode body (14), the extension portion (53) bending inward in the radial direction of the electrode body (14) and being interposed between the grooved portion (22) of the outer can (16) and the electrode body (14).