Button Cell Cap Plate Structure for Short-Circuit Isolation
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Solution Overview
Problem
Conventional button cells face challenges in preventing short circuits between the cap plate and terminal plate due to the positioning of the welded portion at the upper part, making it difficult to overlap the bonding layer effectively, and complicating the welding process.
Innovation Solution
The button cell design positions a side welded portion between the case and cap plate on the side, incorporating a bonding layer that protrudes to overlap the step portion of the cap plate, and features welding grooves to facilitate easy welding and minimize interference, ensuring insulation and secure bonding between the cap plate and terminal plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the welded portion is positioned at the upper portion of the button cell, then the structure is simplified, but the bonding layer cannot effectively overlap the welded portion to prevent short circuits
Solution Approach 1:
The welded portion is repositioned from the upper portion to the side portion of the button cell, changing its spatial dimension. This dimensional shift allows the bonding layer to effectively overlap the welded portion, preventing short circuits while maintaining structural simplicity.
2Ease of manufacture
If the welded portion is positioned at the upper portion, then assembly is easier, but the bonding layer overlap is insufficient for reliable insulation
Solution Approach 1:
By moving the welded portion to the side, the bonding layer can now overlap it effectively, achieving both ease of assembly and precise insulation coverage.
3Device complexity
If the welded portion is at the upper portion, then the design is simpler, but interference from the welded portion cannot be suppressed
Solution Approach 1:
The welded portion is extracted from the upper portion and repositioned to the side, removing its harmful interference effects from the critical upper region where the bonding layer operates.
4Reliability
If the bonding layer is to overlap the welded portion for short circuit prevention, then reliability improves, but the design becomes more complex
Solution Approach 1:
Instead of making the bonding layer more complex to reach the upper welded portion, the welded portion is repositioned to the side, allowing the bonding layer to naturally overlap it, achieving reliability without increased design complexity.
Data Source
AI summary
A button cell includes an electrode assembly, a case including an opening exposing the electrode assembly, a cap plate coupled to the case to cover an outer region of the opening and including a through hole exposing a central region of the opening, and a step portion recessed to correspond to a sidewall of the case and in which the sidewall of the case is inserted, a terminal plate connected to the second electrode tab, insulatively bonded to the cap plate, and covering the through hole, a bonding layer between the cap plate and the terminal plate and insulatively bonding between the cap plate and the terminal plate, and a side welded portion between the step portion of the cap plate and the sidewall of the case.