Secondary Battery Cover With Recessed Mounting Portion
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Solution Overview
Problem
There is a need to reduce the size and weight of secondary batteries while maintaining their capacity, safety, and reliability, as portable electronic devices require more compact power sources without compromising performance.
Innovation Solution
The design incorporates a battery case with a recessed mounting portion and a cover featuring extension flanges that are securely fixed using a label, ensuring stable coupling without increasing volume, with specific dimensions for the flanges and mounting portions to prevent protrusions and ensure strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery case and cover are designed with traditional mounting structures, then the assembly is simple to manufacture, but the overall size and volume of the battery cannot be reduced
Solution Approach 1:
The extension portion of the cover is nested within the recessed mounting portion of the battery case, creating a compact integrated structure. This nesting arrangement allows the cover to be securely mounted while minimizing the overall volume of the battery assembly, directly resolving the contradiction between volume reduction and manufacturing simplicity.
Solution Approach 2:
The design introduces a recessed mounting portion that creates a stepped dimensional structure rather than a flat mounting surface. This dimensional change allows the cover's extension portion to be accommodated within the case structure, reducing the external volume while maintaining secure attachment, thus achieving volume reduction without complicating manufacturing.
2Strength
If extension portions are added to the cover to improve fixation, then the coupling strength increases, but the volume and weight of the battery increase
Solution Approach 1:
The extension portion is designed to fit within the recessed mounting portion, creating a nested configuration that provides strong coupling through interference fit and mechanical interlocking. This nesting ensures the extension portion does not protrude beyond the case outer surface, maintaining compact volume while achieving strong fixation between the cover and case.
Solution Approach 2:
The recessed mounting portion is designed with specific dimensional parameters (depth D1, width W1) that are optimized to provide strong mechanical coupling locally at the mounting interface. This localized quality enhancement ensures strong fixation only where needed, without adding volume elsewhere in the battery structure.
3Reliability
If the mounting portion is made larger to ensure secure fixation, then the reliability of assembly increases, but the overall battery size increases
Solution Approach 1:
The extension portion is nested within the recessed mounting portion, ensuring that the mounting structure does not increase the external dimensions of the battery. The nested configuration provides reliable assembly through mechanical interlocking while keeping the battery length compact, as the mounting features are contained within the existing envelope of the battery case.
Solution Approach 2:
The recessed mounting portion creates a stepped structure that utilizes the internal volume of the case rather than extending the external dimensions. This dimensional arrangement allows for a larger mounting interface area and deeper engagement for improved reliability, while the external length of the battery remains unchanged as the mounting features are recessed.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A secondary battery includes a battery case having a first surface; and a cover that covers at least one portion of the first surface. In the secondary battery, the cover includes at least one extension portion that covers at least one portion of a second surface perpendicularly connected to the first surface of the battery case. The second surface of the battery case is provided with a mounting portion on which the extension portion is mounted, and the mounting portion is recessed inward from a peripheral portion of the mounting portion.