Battery Cell Casing Burst Membrane for Reliable Pressure Venting
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Solution Overview
Problem
Bursting membranes made of iron or iron alloys in battery cell casings are difficult to implement technically and economically due to their high tensile strength, leading to unreliable bursting and increased manufacturing costs when integrated directly into the cell casing.
Innovation Solution
A multi-part bursting device with an insert element and a bursting membrane featuring a cutting geometry is used, structurally weakening the bursting membrane to ensure reliable bursting at a desired pressure range (2-30 bar) without a predetermined breaking point, allowing integration into an iron-based cell casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bursting membrane made of iron or iron alloy is used in the cell casing, then the tensile strength and structural integrity of the casing is improved, but the bursting membrane fails to burst reliably at the required pressure due to the high tensile strength of iron
Solution Approach 1:
The bursting device is divided into multiple functional components: an insert element with a bursting aid featuring cutting geometry, and a bursting membrane. This segmentation allows the iron-based membrane to be weakened locally by the cutting geometry of the bursting aid, enabling reliable bursting while maintaining the overall strength benefits of iron material
Solution Approach 2:
The bursting aid with cutting geometry is pre-positioned on the insert element before the bursting event occurs. This preliminary arrangement ensures that when pressure builds up, the cutting geometry immediately engages with the bursting membrane to create a controlled failure point, ensuring reliable bursting at the desired pressure range (2-30 bar)
2Ease of manufacture
If a bursting membrane is directly incorporated into an iron-based cell casing, then the manufacturing process is simplified, but the high tensile strength of iron makes integration technically difficult and economically unfavorable
Solution Approach 1:
The bursting device is segmented into an insert element with bursting aid and a bursting membrane, allowing these components to be manufactured separately and then assembled together. This approach avoids the technical difficulties of directly integrating a bursting membrane into iron-based casing while maintaining manufacturing efficiency
Solution Approach 2:
The insert element acts as an intermediary component between the iron-based cell casing and the bursting membrane. It provides the necessary cutting geometry to weaken the membrane while serving as a mounting structure that facilitates assembly, thereby simplifying the overall manufacturing process despite the multi-component design
3Stability of the object's composition
If a bursting membrane with high tensile strength is used to maintain casing stability, then the structural integrity is improved, but the membrane requires higher pressure to burst which reduces safety in case of defects or improper handling
Solution Approach 1:
The bursting membrane maintains high tensile strength and structural stability in most areas, but the cutting geometry of the bursting aid creates a localized weak point. This local quality change allows the membrane to remain stable under normal conditions while ensuring it bursts at the desired pressure range (2-30 bar) when gas pressure builds up, preventing dangerous pressure accumulation
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 solution enables a safe, reliable, and cost-effective bursting mechanism for iron-based cell casings, maintaining casing stability and reducing manufacturing complexity by eliminating separate components.
Implementation Method 1
The bursting aid has a cutting geometry which is associated with the bursting membrane
Data Source
AI summary
A cell casing for a battery cell body has side walls and a bursting device which is arranged on one of the side walls. The bursting device is formed from an insert element and a bursting membrane. The insert element has a bursting aid having a cutting geometry which is associated with the bursting membrane. The bursting aid projects in the direction of the bursting membrane beyond a plane defined by the insert element.