Battery Cap Assembly Vent Hole Layout for Short-Circuit Isolation
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Solution Overview
Problem
In existing battery cap assemblies, the hole plate and insulation gasket can shift relative to each other, leading to a short circuit due to contact with the anti-explosion sheet, compromising safety performance.
Innovation Solution
The cap assembly design includes an insulation gasket with an orthographic projection within the vent hole of the hole plate, isolating a portion of the anti-explosion sheet from the hole plate, thereby reducing the likelihood of short circuits and increasing friction to restrict movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the hole plate and insulation gasket are designed with the same shape and size vent holes, then the manufacturing is simplified, but the insulation reliability deteriorates due to potential contact between the hole plate and anti-explosion sheet
Solution Approach 1:
The patent applies asymmetry by designing the vent hole in the insulation gasket with a different shape or size compared to the vent hole in the hole plate. This asymmetric design prevents the insulation gasket from perfectly aligning with the hole plate, thereby avoiding direct contact between the hole plate and the anti-explosion sheet while maintaining manufacturing feasibility.
Solution Approach 2:
The patent introduces an intermediary element (the asymmetrically designed insulation gasket) between the hole plate and the anti-explosion sheet. This intermediary prevents direct contact and potential short circuits while still allowing the venting function to operate effectively.
2Adaptability or versatility
If the insulation gasket is designed to allow movement relative to the hole plate, then the assembly flexibility is improved, but the safety performance deteriorates due to potential short circuits during safety testing
Solution Approach 1:
The asymmetric design of the vent holes allows the insulation gasket to maintain flexibility in assembly while preventing perfect alignment during safety testing. The shape or size difference ensures that even if movement occurs, the hole plate cannot directly contact the anti-explosion sheet through the vent hole alignment.
3Stability of the object's composition
If the vent hole in the insulation gasket has the same shape and size as the hole plate vent hole, then the structural symmetry is maintained, but the friction between components is reduced leading to increased movement during testing
Solution Approach 1:
The patent deliberately breaks structural symmetry by designing the vent hole in the insulation gasket with a different shape or size than the hole plate vent hole. This asymmetric design increases friction during assembly and testing, preventing unwanted movement and rotation of the insulation gasket relative to the hole plate.
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 design enhances insulation and reduces the probability of short circuits by isolating the insulation gasket and anti-explosion sheet, ensuring effective pressure relief and maintaining electrical isolation during safety testing.
Implementation Method 1
a friction between the insulation gasket and the hole plate and a friction between the insulation gasket and the anti-explosion sheet are increased. In this way, rotation or translation of the insulation gasket, during testing the safety performance of the battery, is restricted
Data Source
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AI summary
A cap assembly includes: a hole plate (120), defining at least one first vent hole (K1); an anti-explosion sheet (140); and an insulation gasket (130), disposed between the hole plate and the anti-explosion sheet and defining a center hole (K2). A portion of the anti-explosion sheet passes through the center hole and abuts against the hole plate, and a portion of the insulation gasket has an orthographic projection projected onto the hole plate, and the orthographic projection is located within the at least one first vent hole.