Secondary Battery Pull Tab Preventing Reverse Assembly
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Solution Overview
Problem
Existing secondary battery designs face challenges in ensuring proper assembly directionality and preventing reverse assembly, which can lead to functional issues and increased manufacturing complexity, particularly due to the lack of distinct directional cues during the assembly process.
Innovation Solution
The secondary battery design incorporates a bottom case with asymmetrical adhered parts and a pull tab that protrudes through a penetration groove, featuring a zig groove for orientation and a stepped structure to facilitate correct assembly and prevent reverse assembly, while the pull tab's flexibility aids in easy mounting and dismounting within electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional symmetric battery case design is used, then the manufacturing process is simple, but it is difficult to identify assembly direction and prevent reverse assembly
Solution Approach 1:
The patent applies asymmetry by introducing a pull tab at one specific location of the battery case and a zig groove at a specific position on the adhered part. These asymmetric features create distinct directional cues that enable easy identification of the correct assembly orientation and prevent reverse assembly, directly resolving the contradiction between assembly reliability and structural complexity
2Strength
If adhesive is applied extensively to ensure proper bonding, then bonding strength is improved, but manufacturing complexity and material usage increase
Solution Approach 1:
The patent applies local quality by concentrating the adhesive application to a specific localized region defined by the zig groove on the adhered part. This groove creates a precise adhesive reception area that ensures adequate bonding strength while minimizing adhesive usage and simplifying the manufacturing process, directly resolving the contradiction between bonding strength and ease of manufacture
3Ease of operation
If the pull tab is made rigid for structural strength, then mechanical strength is improved, but ease of installation and removal is reduced
Solution Approach 1:
The patent applies dynamics by designing the pull tab with a flexible portion that allows bending motion. This flexible section enables the pull tab to be easily inserted and removed from the battery pack while maintaining sufficient structural strength in the rigid portions, directly resolving the contradiction between ease of operation and mechanical strength
Data Source
AI summary
A secondary battery includes a battery cell, a protection circuit module electrically connected to the battery cell, a top case covering the protection circuit module, and a bottom case covering a bottom surface of the battery cell. The bottom case includes a pull tab protruding to an outside of the bottom case.