Battery Cell Burst Disc Structure for Stable Vent Pressure
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Solution Overview
Problem
Existing explosion-proof valves in battery cells face challenges in maintaining a stable burst pressure threshold due to external stress and internal pressure fluctuations, leading to potential safety hazards.
Innovation Solution
The proposed explosion-proof valve features a burst disc with an internal platform thicker than the external platform, a burst ring, and a connecting portion, designed to increase strength and prevent deformation, thereby maintaining a consistent burst pressure threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the burst disc is made thinner to reduce manufacturing complexity, then ease of manufacture is improved, but strength and stability deteriorate, causing deformation under external stress and pressure fluctuations
Solution Approach 1:
The burst disc employs non-uniform thickness distribution with different thickness regions (first thickness in the first region, second thickness in the second region). This local quality variation allows the disc to have sufficient strength and stability in critical areas while maintaining overall manufacturability and controlling costs in less critical areas.
2Strength
If the burst disc thickness is increased uniformly to improve strength, then strength is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of uniformly increasing thickness across the entire burst disc, the patent applies different thicknesses to different regions based on their specific functional requirements. This localized approach provides necessary strength where needed while avoiding unnecessary complexity and cost in other areas.
3Device complexity
If the burst disc structure is simplified to reduce device complexity, then device complexity is reduced, but stability deteriorates due to susceptibility to deformation from external stress and pressure fluctuations
Solution Approach 1:
The burst disc incorporates different thickness regions strategically positioned to provide enhanced stability in areas subjected to external stress and pressure fluctuations, while maintaining overall structural simplicity and avoiding unnecessary complexity in the overall design.
Data Source
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AI summary
The embodiments of the present application relate to the field of cells, and provide an explosion-proof valve, which includes a burst disc, a burst ring, and a connecting portion. The burst disc includes an internal platform and an external platform arranged around the internal platform to be connected to an outer circumference of the internal platform, and a thickness of the internal platform is greater than a thickness of the external platform. The explosion-proof valve further includes a burst ring defined on an outer circumference of the external platform, where a thickness of the burst ring is smaller than the thickness of the external platform, and the burst ring is a recess recessed from the upper side to the lower side. The explosion-proof valve further includes a connecting portion arranged around an outer circumference of the burst ring, and the connecting portion is connected to the burst ring. The explosion-proof valve provided according to the embodiments is beneficial for improving the safety performance of the battery.