Cell Housing Burst Membrane Geometry for Controlled Pressure Relief
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Solution Overview
Problem
Bursting membranes made of iron or iron alloys in battery cell housings are difficult to implement technically and economically due to their high tensile strength, leading to unreliable and slow bursting, and separate components are challenging to integrate into ferrous material cell housings.
Innovation Solution
A cell housing design with a bursting membrane made of iron or an iron alloy, formed in one piece with the cell housing, that bursts reliably at a pressure of 2 to 30 bar through stability failure, featuring a convex and concave side, and includes a weakening zone and stiffening element for controlled bursting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bursting membrane made of iron or iron alloy is used in a cell housing, then the housing structural integrity is improved, but the bursting reliability deteriorates due to significantly higher tensile strength
Solution Approach 1:
The bursting membrane is designed with a convex side and concave side, creating local geometric differences. The convex side faces the battery cell body interior while the concave side faces the exterior. This geometric design creates stress concentration zones that facilitate controlled bursting at lower pressures (2-30 bar) despite the high tensile strength of iron materials, thereby resolving the contradiction between housing strength and bursting reliability.
Solution Approach 2:
The patent changes the geometric parameters of the bursting membrane by introducing convex and concave surfaces, rather than using a flat membrane. This parameter change modifies the stress distribution and failure characteristics of the iron membrane, enabling it to burst reliably at appropriate pressures while maintaining the structural integrity benefits of iron materials.
2Device complexity
If a bursting membrane is directly incorporated into a ferrous cell housing, then manufacturing complexity is reduced, but implementation difficulty increases due to material properties
Solution Approach 1:
The bursting membrane is formed as an integral part of the cell housing in one piece, merging two previously separate components (housing and membrane) into a single ferrous structure. This eliminates the need for separate membrane insertion or bonding processes, thereby reducing manufacturing complexity while the convex-concave design ensures proper bursting functionality is achieved.
Data Source
AI summary
A cell housing for accommodating a battery cell body includes a closed, circumferential, frame-like peripheral wall made of a flat material. The peripheral wall is formed in one piece and has an overlap section in which an initial section of the peripheral wall and an end section of the peripheral wall overlap and are fastened to each other. The overlap section has a bursting device including a bursting membrane, wherein the bursting membrane has a convex side and a concave side.