Secondary Battery Notch Electrode Lead for Internal Pressure Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary batteries face safety risks due to potential ignition or explosion when internal pressure exceeds a certain level, necessitating a mechanism to interrupt current flow and prevent such incidents.
Innovation Solution
The secondary battery design includes an electrode lead with a notch part of thinner thickness, bent to form an L-shape, which is electrically connected to an electrode tab and an outer protrusion, allowing for efficient interruption of current flow when internal pressure increases, thereby preventing ignition or explosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety device is added to interrupt current flow when internal pressure increases, then safety is improved, but device complexity increases
Solution Approach 1:
The safety function is merged with the existing electrode lead structure by incorporating a notch part directly into the lead itself, eliminating the need for separate safety devices while achieving current interruption when internal pressure increases
Solution Approach 2:
The electrode lead with the notch part automatically performs the safety function of interrupting current flow when internal pressure increases, without requiring external control systems or additional safety mechanisms - the structure itself provides the safety service
2Volume of moving object
If the electrode lead is bent to form an L-shape using the notch part, then space utilization is improved, but manufacturing precision requirements increase
Solution Approach 1:
The notch part is pre-formed during the electrode lead manufacturing process, creating a predetermined bending axis that guides the subsequent L-shaped folding. This preliminary preparation ensures accurate positioning and reduces the precision requirements for the actual bending operation
Solution Approach 2:
The notch part creates a localized region with different mechanical properties (thinner thickness) compared to the rest of the electrode lead, making this specific area more suitable for bending while maintaining the structural integrity of other portions
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A secondary battery is disclosed. According to the present invention, when an internal pressure exceeding a certain level occurs, current may be interrupted to stop an operation of the secondary battery, thereby preventing the secondary battery from being ignited or exploded by the increase in internal pressure of the secondary battery and improving safety of the secondary battery.