Movable Fixing Terminal for Battery Bus Bar Vibration
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Solution Overview
Problem
Rechargeable battery modules experience poor contact between electrode terminals and bus bars due to loose connections, especially under vibrations, and have difficulties in replacing defective batteries when the bus bar and electrode terminals are welded together.
Innovation Solution
A rechargeable battery module design featuring a movable fixing terminal that supports and secures the bus bar, utilizing a combination of grooves, protrusions, and a twist-deformed connecting rod to maintain stable contact and facilitate easy replacement, preventing contact degradation from vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nuts are coupled to electrode terminals to support bus bar, then assembly is simplified, but contact becomes defective under vibrations
Solution Approach 1:
The fixing terminal is designed to be movable relative to the lower terminal, allowing it to absorb vibrations and maintain stable contact with the bus bar. The rotation shaft enables the fixing terminal to adjust its position dynamically, preventing loosening under continuous vibrations while maintaining electrical connection reliability.
Solution Approach 2:
The fixing terminal acts as an intermediary component between the lower terminal and the bus bar. It provides a stable mounting structure with guide protrusions and supporting grooves that secure the bus bar, while the rotation shaft allows controlled movement to maintain contact stability under vibration conditions.
2Reliability
If bus bar and electrode terminals are welded, then contact stability is improved, but replacement of defective battery becomes difficult
Solution Approach 1:
The terminal structure is segmented into separate components: the lower terminal, the fixing terminal, and the bus bar. These components are connected through mechanical means (rotation shaft, guide protrusions, supporting grooves) rather than welding, allowing the battery to be replaced by simply disconnecting the bus bar from the fixing terminal without damaging the electrode terminals.
Solution Approach 2:
The movable fixing terminal with rotation shaft provides a dynamic mechanical connection that maintains stable contact during operation but allows easy disconnection for replacement. This dynamic connection replaces the permanent welded joint, enabling both contact stability during use and ease of replacement when needed.
3Reliability
If fixing terminal is made movable, then vibration resistance is improved, but structural complexity increases
Solution Approach 1:
The fixing terminal incorporates a rotation shaft that enables controlled movement relative to the lower terminal. This dynamic mechanism allows the fixing terminal to absorb vibrations and maintain stable contact with the bus bar, significantly improving vibration resistance while adding only moderate structural complexity through the rotation shaft and guide features.
Data Source
AI summary
A rechargeable battery according to one aspect of the present invention includes: an electrode assembly including a first electrode, a second electrode, and a separator; a case for accommodating the electrode assembly; a first lower terminal protruding out of the case and electrically coupled to the first electrode; and a first fixing terminal installed to be movable with respect to the first lower terminal.