Secondary Battery Coupling Structure With Adhesive Pocket
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Solution Overview
Problem
Existing secondary batteries face issues with external defects due to adhesive overflow during the bonding process of the battery cell and cap cover, and alignment challenges between the battery cell and cap cover.
Innovation Solution
A secondary battery design featuring a coupling structure with a protrusion and adhesive pocket to prevent adhesive overflow and position alignment ribs for precise alignment, ensuring the cap cover and battery cell are securely bonded without gaps, thereby preventing external defects and ensuring precise height control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is used to bond the battery cell and cap cover, then the battery components are securely joined, but adhesive overflow causes external defects
Solution Approach 1:
The harmful overflowed adhesive is extracted and isolated into a dedicated adhesive pocket, separating it from the battery's external appearance. The pocket captures excess adhesive that would otherwise cause defects, allowing the bonding function to proceed without compromising external quality.
Solution Approach 2:
The adhesive pocket acts as an intermediary structure between the bonding interface and the battery exterior. It mediates the conflict between needing sufficient adhesive for strong bonding and preventing adhesive from reaching the external surface, thereby resolving the contradiction.
2Stability of the object's composition
If the battery cell and cap cover are bonded together, then structural integrity is achieved, but alignment between components becomes difficult
Solution Approach 1:
Position alignment ribs are formed on the cap cover in advance to guide and align the battery cell during assembly. This preliminary alignment structure ensures that the cell and cap cover are correctly positioned before bonding occurs, making the manufacturing process easier while maintaining structural integrity.
Solution Approach 2:
The position alignment ribs serve as intermediary alignment features that facilitate the joining process. They mediate between the two components during assembly, ensuring proper alignment before the adhesive sets, thereby resolving the contradiction between achieving structural integrity and ease of manufacture.
3Reliability
If adhesive is applied generously to ensure complete bonding, then bonding reliability improves, but adhesive overflow increases causing external defects
Solution Approach 1:
The adhesive pocket converts the harmful effect of adhesive overflow into a beneficial feature. Instead of viewing excess adhesive as a defect to be avoided, the design provides a dedicated space for it, allowing generous adhesive application to ensure complete bonding while preventing external defects. The overflowed adhesive becomes part of the bonding structure rather than a surface defect.
Data Source
AI summary
A secondary battery is disclosed. In one aspect, the secondary battery includes a battery cell including an electrode and a cap cover placed over the battery cell and having an opening that exposes the electrode. The secondary battery also includes a connection member placed over the cap cover and electrically connected to the electrode. The secondary battery further includes a coupling structure that couples the battery cell and the cap cover. The coupling structure includes a protrusion extending away from the cap cover toward the battery cell, an adhesive pocket formed around the protrusion, and a concave portion formed in the battery cell so as to receive the protrusion.