Gas Release Valve Thin Wall Design for Battery Durability
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Solution Overview
Problem
Conventional energy storage devices face reduced durability of gas release valves due to deformation under internal pressure, as they are often positioned at the middle of the case where stress is concentrated.
Innovation Solution
The gas release valve is designed with a thin wall having an intermediate portion and lateral portions, where the intermediate portion is narrower and forms a groove with branch points, enhancing rigidity and preventing deformation, and the groove is formed discontinuously on the lateral side to prevent scattering and improve durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the gas release valve is positioned at the middle of the wall, then the opening area is maximized for efficient gas discharge, but the durability is reduced due to concentrated stress and deformation from internal pressure
Solution Approach 1:
The thin wall is divided into multiple portions: an intermediate portion at the middle position and two lateral portions on either side. This segmentation allows the intermediate portion to provide a large opening area for gas discharge while the lateral portions serve as support structures that resist deformation and stress concentration, thereby maintaining both productivity and reliability.
Solution Approach 2:
Different portions of the thin wall are given different structural characteristics. The intermediate portion has a larger width to facilitate gas discharge, while the lateral portions have greater width and thickness to provide structural support and resist internal pressure. This local differentiation of properties resolves the contradiction between opening area and durability.
2Reliability
If the thin wall width is increased to improve durability, then resistance to deformation improves, but the opening area decreases reducing gas discharge efficiency
Solution Approach 1:
The thin wall is segmented into an intermediate portion and lateral portions. The intermediate portion maintains a larger width to ensure sufficient opening area for gas discharge, while the lateral portions are designed with greater width to provide structural support. This segmentation allows both requirements to be satisfied simultaneously in different regions.
Solution Approach 2:
The thin wall exhibits asymmetric width distribution: the lateral portions are wider than the intermediate portion. This asymmetric design concentrates the structural support function in the lateral portions while preserving the gas discharge function in the intermediate portion, resolving the contradiction between durability and opening area.
3Strength
If the wall thickness is uniformly increased to prevent deformation, then structural strength improves, but the quick opening capability is reduced
Solution Approach 1:
The wall thickness is segmented: the lateral portions have greater thickness to provide structural strength and resistance to deformation, while the intermediate portion maintains smaller thickness to enable quick opening response. This segmented thickness distribution resolves the contradiction between strength and opening speed.
Solution Approach 2:
Different thickness values are assigned to different portions of the wall based on their functional requirements. The lateral portions have increased thickness for structural support, while the intermediate portion has reduced thickness for rapid gas discharge. This local quality differentiation simultaneously achieves both strength and quick opening capability.
Data Source
AI summary
An energy storage device is provided with a case including a lid body in which a gas release valve is formed. The gas release valve includes a thin wall with a thickness smaller than a thickness of a portion adjacent to the gas release valve. The thin wall includes an intermediate portion and two lateral portions that are arranged at positions sandwiching the intermediate portion in a first direction. As viewed from a normal direction to the lid body, the intermediate portion is disposed at the middle position in the first direction of the lid body and is formed with a width, in a second direction orthogonal to the first direction, smaller than those of the two lateral portions.