CID Filter Through-Hole Layout to Protect Battery Gaskets
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Solution Overview
Problem
The existing CID gaskets in cylindrical type secondary batteries melt due to excessive heat transfer from the CID filter during a short circuit, preventing the safety vent from effectively cutting off current.
Innovation Solution
A CID filter design with auxiliary through-holes of reduced width is introduced, strategically positioned to minimize heat transfer to the CID gasket by blocking the shortest heat transfer path between the high-heat connection area and the gasket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CID filter is bonded to the electrode tab to enable current cutoff function, then the safety vent can cut off current when pressure exceeds certain value, but heat generated in the bonding region transfers to the CID gasket causing it to melt
Solution Approach 1:
The patent introduces an auxiliary through-hole as an intermediary structure in the CID filter. This hole acts as a thermal barrier that interrupts the direct heat transfer path from the electrode tab bonding region to the CID gasket, while maintaining the electrical connectivity needed for the current cutoff function.
Solution Approach 2:
The CID filter is segmented by introducing an auxiliary through-hole that divides the continuous material structure. This segmentation creates a discontinuity in the heat conduction path, effectively blocking heat flow to the gasket while preserving the functional integrity of the CID filter.
2Reliability
If the safety vent is designed to break and disconnect current when pressure exceeds certain value, then explosion or fire can be prevented, but the CID gasket melts due to heat transfer preventing effective current cutoff
Solution Approach 1:
The auxiliary through-hole is designed in advance to prevent the heat transfer problem before it occurs. By pre-establishing this thermal barrier structure, the patent ensures that the CID gasket will not melt even when the safety vent operates under high-temperature conditions during a short circuit.
3Reliability
If heat is generated in the electrode tab and CID filter bonding region during short circuit, then current cutoff is triggered, but the heat causes CID gasket melting and reconnection of safety vent and CID filter
Solution Approach 1:
The patent extracts or removes the problematic heat transfer path by introducing the auxiliary through-hole. This effectively takes out the thermal conduction channel that would otherwise transfer harmful heat to the CID gasket, allowing the short circuit protection function to operate without the harmful side effect of gasket melting.
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
Minimizes heat transfer to the CID gasket, preventing melting and ensuring effective current cutoff even during a short circuit, thereby enhancing safety.
Implementation Method 1
the heat generated in the region in which the electrode tab and the CID filter are bonded to each other passes through the CID filter and then is transferred to a CID gasket disposed around the CID filter
Data Source
AI summary
According to one aspect of the present invention, a body part of a CID filter of a secondary battery has a main through-hole and an auxiliary through-hole defined therein. The auxiliary hole is positioned between a CID gasket and an area of the CID filter that is electrically connected to an electrode tab.