CID Filter Through-Hole Layout for Battery Gasket Heat Blocking
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Solution Overview
Problem
The existing CID filters in cylindrical type secondary batteries fail to effectively minimize heat transfer to the CID gasket during a short circuit, leading to potential melting of the CID gasket and compromised safety.
Innovation Solution
The proposed CID filter design incorporates a body part with main through-holes and auxiliary through-holes of varying widths, strategically positioned to minimize heat transfer. The auxiliary through-holes are defined between the first connection area and the CID gasket, disrupting the direct heat path and reducing thermal conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the CID filter is provided with a solid body structure to ensure mechanical strength, then the structural integrity is improved, but heat is transferred to the CID gasket causing melting
Solution Approach 1:
The CID filter body is designed with through-holes forming a porous structure that allows electrical current to pass through while disrupting heat conduction paths. The porous configuration reduces thermal conductivity by creating multiple heat transfer paths and increasing thermal resistance, preventing heat from reaching the CID gasket while maintaining mechanical strength through the distributed hole structure.
Solution Approach 2:
The CID filter employs a composite structure combining solid matrix material with void spaces (through-holes). This composite configuration provides both mechanical strength from the solid framework and thermal insulation from the air-filled voids, achieving a balance between structural integrity and heat blocking capability.
2Reliability
If the CID filter uses a solid structure to maintain electrical connection, then electrical conductivity is improved, but heat conduction to the CID gasket increases causing safety issues
Solution Approach 1:
The porous structure with through-holes provides multiple electrical conduction paths through the filter body while simultaneously creating thermal barriers. The distributedå” structure maintains electrical connectivity by allowing current to flow through multiple routes while the air-filled voids interrupt direct heat conduction paths to the CID gasket.
3Temperature
If auxiliary through-holes are added to the CID filter body, then heat transfer to CID gasket is reduced, but device complexity increases
Solution Approach 1:
The CID filter body is segmented into multiple regions with through-holes distributed throughout. This segmentation creates numerous small thermal barriers rather than one large barrier, effectively reducing heat transfer to the CID gasket. The segmented hole pattern is integrated into the manufacturing process, minimizing additional complexity while maximizing thermal management effectiveness.
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
This design effectively minimizes heat transfer to the CID gasket, preventing melting and ensuring the safety of the secondary battery even during abnormal high-temperature conditions caused by short circuits.
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.