Cylindrical Battery Current Interrupt Structure for Vibration Fatigue
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The connection portion between the contact portion and the positive electrode lead in cylindrical batteries is susceptible to fatigue fracture due to vibration, leading to reliability issues.
Innovation Solution
A cylindrical battery design featuring a current interrupt device with a cover, holder, and disk configuration, where the disk's second protrusion is ultrasonically welded to the cover's bottom portion, and the holder's flange portions are designed to enhance structural integrity and prevent fatigue fractures under vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contact portion and positive electrode lead connection is provided in the current interrupt device, then electrical connection functionality is achieved, but the connection portion becomes susceptible to fatigue fracture due to vibration
Solution Approach 1:
The current interrupt device is divided into separate functional components: a cover portion, a holder portion, and a disk portion. The contact portion is integrated with the disk portion rather than directly connecting to the positive electrode lead, separating the electrical connection function from the current interruption function. This segmentation isolates the connection portion from vibration-induced stress concentrations.
Solution Approach 2:
The holder portion acts as an intermediary component between the cover and disk portions. It provides a stable mounting structure that absorbs and distributes mechanical stresses, protecting the electrical connection between the contact portion and positive electrode lead from direct vibration impacts. The holder serves as a buffer that mediates the transmission of mechanical forces.
2Ease of manufacture
If the current interrupt device uses a simple structure with fewer components, then manufacturing complexity is reduced, but structural integrity under vibration and impact is compromised
Solution Approach 1:
Multiple functions are merged into the integrated current interrupt device structure: the cover portion provides both mechanical protection and electrical insulation, the holder portion simultaneously supports the disk and absorbs vibrations, and the disk portion handles both current interruption and electrical connection. This functional merging achieves robust structural integrity without requiring additional separate components for each function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The improved design significantly enhances the battery's reliability against vibration and impact by reducing the likelihood of fatigue fractures and electrolyte leakage, while maintaining effective pressure regulation.
Implementation Method 1
a top portion of the second protrusion is connected to the first bottom portion by welding
Data Source
AI summary
A cylindrical battery is provided and includes a columnar electrode body, a cylindrical battery can in which one end portion is opened and the electrode body is accommodated, and a current interrupt device provided at the one end portion. The current interrupt device includes a cover, a holder provided inside the cover, and a disk provided inside the holder.