Secondary Battery Collector Tab Deviated Joining
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Solution Overview
Problem
Existing secondary battery designs face challenges in reducing external loads such as vibration and impact on the boundary between the electrode body and electrical collector tab during the joining process, which can lead to damage risks and increased resistance.
Innovation Solution
The design incorporates an electrical collector tab with an extension part and a branch part that extends from the tip end area in a direction different from the extension part, allowing the tab and terminal to be joined at a deviated position, reducing the external load on the starting point of the extension and increasing the join area size, thereby minimizing damage and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the electrical collector tab and electrical collector terminal are joined at the tip end of the extension part, then the join area size is maximized, but external load (vibration and impact) is concentrated on the boundary between the electrode body and the extension part, increasing damage risk
Solution Approach 1:
The electrical collector tab is segmented into an extension part and a branch part. The branch part extends from the tip end area of the extension part in a direction different from the extension part, creating a separate joining region. This segmentation allows the join to occur at the branch part rather than directly at the vulnerable boundary of the extension part, distributing the external load away from the critical interface between the electrode body and extension part while maintaining adequate join area through the branch part configuration.
2Object-affected harmful factors
If the branch part extends in a direction approximately vertical to the extension part, then external load is minimized on the starting point, but the join area size is reduced
Solution Approach 1:
The branch part extends from the tip end area of the extension part in a direction different from the extension part, preferably in a direction approximately vertical to the extension part. This dimensional change in orientation creates spatial separation between the join location and the vulnerable boundary, effectively reducing external load transmission to the starting point while the branch part's configuration maintains adequate join area for electrical connection.
Data Source
AI summary
A technique is provided which reduces an external load, such as vibration and impact, applied on a boundary between an electrode body and an electrical collector tab. The herein disclosed secondary battery includes an electrode body, a case main body, and a cover. The cover includes an electrical collector terminal attached via an insulating material. The electrode body includes an electrical collector tab. The electrical collector tab includes an extension part that extends from the electrode body, and a branch part that extends from a tip end area of the extension part in a direction different from the extension part. The branch part includes a portion joined to the electrical collector terminal.