Battery Insulator Mesh Venting for Short-Circuit Prevention
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Solution Overview
Problem
Secondary batteries face stability issues due to potential short circuits and gas buildup during thermal runaway events, which can lead to explosions and reduced performance.
Innovation Solution
Incorporating an insulator with a mesh area overlapping the vent portion in the secondary battery design, featuring a separation space and specific dimensions to prevent short circuits while allowing efficient gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid insulator is placed over the vent portion, then short circuit prevention is improved, but gas discharge efficiency deteriorates
Solution Approach 1:
The insulator includes a mesh area with mesh-shaped openings that allows gas to pass through while maintaining electrical insulation. The mesh structure provides both short circuit prevention and gas discharge functionality simultaneously, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The insulator combines conductive and insulating properties through its mesh structure, creating a composite functional material that allows gas passage while preventing electrical contact between the electrode assembly and case.
2Productivity
If the mesh area is made larger, then gas discharge efficiency is improved, but the insulator's mechanical strength deteriorates
Solution Approach 1:
The insulator has different structural properties in different areas: the mesh area with openings for gas discharge, the intermediate area providing structural support, and the outer area for electrical insulation. This local differentiation allows the mesh area to be large for gas discharge while the intermediate area maintains mechanical strength.
Solution Approach 2:
The insulator is divided into three distinct areas (mesh area, intermediate area, outer area) with different functions. The mesh area provides gas discharge, the intermediate area provides structural support, and the outer area provides electrical insulation, allowing each area to optimize its specific function without compromising overall performance.
3Volume of stationary object
If the insulator is positioned closer to the vent portion, then space utilization is improved, but gas flow resistance increases
Solution Approach 1:
The mesh area extends beyond the vent portion boundaries, providing both gas discharge functionality and structural support. This excessive extension ensures adequate gas flow path while maintaining proper spacing for ventilation efficiency.
Data Source
AI summary
A secondary battery includes: an electrode assembly including a cathode, an anode, and a separator between the cathode and the anode; a case accommodating the electrode assembly in an internal space, and including a vent portion; a cap plate covering an upper portion of the case to seal the case; and an insulator between the electrode assembly and the case within the case. The vent portion is located at a side of the case opposite to the cap plate, and at least an area of the insulator overlapping with the vent portion includes a mesh area having a mesh shape.